32

Tracto-TechnikHead officeP.O. Box 40 20D-57356 LennestadtTel.: (+49) 2723/8080Fax: (+49) 2723/808189

TT Technologies2020 East New York St.USA-Aurora, IL 60504Tel.: 630-851-8200Fax: 630-851-8299

Tracto-TechniquesSiège SocialB.P. 26, Z.I. de l’OisonF-76320 St Pierre lès ElbeufTel.: 02.35.81.50.24Fax: 02.35.81.40.82

Tracto-TechnikPlant 3An der KarlshütteD-57368 LennestadtTel.: (+49) 2723/91550Fax: (+49) 2723/9155480

Distributed by:

TRA

CTU

ELL for collectionTT UK Ltd10 Windsor RoadGB-BedfordMK 42 9SUTel.: 01234.342.566Fax: 01234.352.184

Edition No. 8/E, February 1998

Impressum

© Copyright by:TRACTO-TECHNIKSpezialmaschinen D-57356 Lennestadt

Contents:Carola Schmidt

Setting and Layout:Anne Knour

Photography:Fotostudio Rickert

Printed by: Druckerei Hachen-burg on recycable paper

Circulation: 10,000 copies

TRACTUELLFax+49 27 23 / 80 8189

Newsletter from TRACTO-TECHNIK

http://www.tracto-technik.de · E-Mail: export@tracto-technik.de

Welcome to the world’s largest construction fair!

Visit us on our

stand block 1109,

0pen air area,

Neue Messe, Munich

30.03.-05.04.98

At Bauma 98, taking place inMunich from March 30th toApril 5th, more than 1,700companies from all over theworld will exhibit their pro-ducts on about 430,000 m2.That’s what makes this fairthe largest and most impor-tant of its kind.

On 600 m2 Tracto-Technik(TT Group) presents every-thing around trenchless pipeinstallation. There‘s a lot todiscover besides the range

of proven TT products: thenew Grundomat Power ge-neration, the latest memberof the family of steerableboring systems, a newBentonite recycling unit,advanced pipe burstingtechniques with Grundo-crack, demonstration job-sites and much more.

Come and see for yourself.Looking forward to seeingyou at Bauma ‘98!

bauma 98®

Neue Messe, Munich 30.3.-5.4.1998

In view of the ever increas-ing world-wide demandfor TT products, both pro-duction and office spaceat the T.T. Group Head-quarters in Lennestadt/

at TRACTO-TECHNIKGermany proved to be in-adequate. In Autumn ‘96planning preparationswere completed and theconstruction work com-menced on the two newoffice levels which addedanother 450m2 to the cur-rent office building size.

The new training centre inthe upper store is equip-ped with up-to date com-munication technologyand can accomodate 50persons.

Construction was com-pleted in July '97.

Tracto-TechniquesAgence EstAvenue Benoit FrachonF-24750 PérigueuxTel.: 05.53.53.89.83Fax: 05.53.09.39.41

Office extensionOffice extensionat TRACTO-TECHNIK

The mayor of Lennestadt congratulates TT chairman Wolf-gang Schmidt on the occassion of the formal opening ofthe new office levels.

sulted in a large numberof restrictions;2. due to the restrictedwidth of the ditch, opentrench excavation and theresulting movement oflarge quantities of soil wasnot possible;3. movement of large sizeconstruction equipmentwas only partially pos-sible.Therefore, contractorGunter HÜTTNER & Co

from Chemnitz proposedthe use of his experiencedteam using the pipe-bursting system. His pro-posals, including 45 man-holes, were finally accep-ted at a total contractvalue of about 1 millionD-Mark.

The task was not only toreplace the former claypipe but also to increaseits original pipe carryingcapacity from 400mm(16”) to 500mm (20”), in-stalling a heavy wall HD-PE pipe for the major partof the project. On a smal-ler section of 55m (165 ft),leading towards LakeBornstedt, even the origi-nal 300mm (12”) pipe hadto be up-sized to 500mm(20”). The total projectwas therefore divided intoshorter pipe bursting sec-tions, the longest being160m (500 ft).

The de-watering pipe hadbeen installed at a depthfrom between 0m to 4m ata constant grade.

After a distance of 1,300m(4,000 ft), the new de-wa-tering pipe was to reach a

King Frederic the Greatfrom Prussia, being in-fluenced by French cul-ture, architecture andlanguage, had built hisrenowned summer resi-dence near Potsdam/Germany, naming it"Sanssouci”, meaning"without sorrow”.

But life in the late 18thcentury may not havebeen without sorrowwhen the Lake Bornstedt,located close to the cast-le, once again overflowedand flooded the castle

lated by trees and bushes.In 1996, after a TV came-ra inspection, the City ofPotsdam decided to re-place the former clay pipesystem. During the courseof time, the old de-wate-ring pipe had become

surroundings. During KingFrederic’s l ifetime, thisproblem was solved byconstructing an open de-watering ditch, named"devil's ditch” by the lo-cals. At a distance ofabout 1.5 km from thecastle, the water from theditch flows into the RiverHavel. Some years agoUNESCO declared thebuilding and its surroun-dings a historical monu-ment which deservedspecial protection.

More than 100 years ago300mm (12”) and 400mm(16”) clay pipes were in-stalled and the once opentrench was soon coveredwith earth, densely popu-

congested with tree rootsand due to collapsed sec-tions, total pipe inspectionwas not possible. How-ever, the initial inspectiongave a good idea of whatcould be expected aboutthe state of the remainingsections.

Simple internal pipe reno-vation was ruled out be-cause of the disastrous

state of the clay pipe. Tra-ditional new pipe installa-tion methods could not beconsidered because: 1. the "devil's ditch” isprotected by UNESCOand any type of construc-tion works would have re-

Typical damage to the clay pipe DN 400 (16”) installedmore than 100 years ago

floodwater cleaning sys-tem that was specificallydesigned and built to se-parate dirt particles in thelake water which hadbeen contaminated bymilitary use in previous de-cades. After the cleaningprocess the water is thenfed into the River Havel.

In view of the state of thepipe, immediate actionwas required and despitethe unfavourable weatherconditions, the first pipe-bursting jobs were startedat the beginning of De-cember 1996.

The specially designedpipe-renewal winch - 10tonne GRUNDOWINCH -owned by the contractor,turned out to be of insuffi-cient pulling power on this

project as the encrusta-tions and sediment insidethe old clay pipe turnedout to be so hard thateven 10 tonnes of con-stant pull could not produ-ce the required results. A20 tonne Grundowinchwas then used.

For each section ofthe project, the

winch l inewas introdu-ced into theold mainusing aCobra glassfibre rod.Due to thecongestion in

2 3

A PIPE-CRACKING JOBSITE IN THE

View over Lake Bornstedtclose to the castle.

the old pipe, some sec-tions even had to be cle-aned prior to allowing thewinch l ine to passthrough.

Additionally the highground water level up to1 m above the axis ofsome of the pipe-cracking sections was aproblem; fortunately, thisdid not lead to any majorhold-ups on the project.

The pneumatic burstinghammer type GOLIATHfrom the TRACTO-TECHNIK (T.T.) Groupwas fitted with a front ex-pander of 670mm (26.5”)and 560 x 31.8 mm (22”)HDPE pipe was connec-ted to the expander usinga butt-fused PE pipe ad-aptor. To reduce butt-fu-

sion times onthe jobsite,specially ma-nufactured20m (60 ft)sections ofHD-PE pipewere used;the remainingbutt-fusionwas then car-ried out in atemporarilyerected,preheatedtent whichwas neces-sary in view ofthe cold weat-her conditi-ons.

Part of thepreparationsof each singlepipe-bursting

section consisted of in-serting the air hoses ofthe Goliath crackinghammer through the newHD-PE pipe-string. The airsupply to power the ham-mer came from two paral-lel connected compres-sors with outputs of 12m3

and 8m3 respectively.

After a number of earlysuccessful bursts in De-cember, severe frostconditions prevented fur-ther HD-PE pipe installa-tions which meant thatthe site came to a stand-still from shortly beforeChristmas up until the

Pipe renewal under the “devil’s bridge”.

middle of January.On February 7th, the TT-team had the opportuni-ty to visit the contractor'sjobsite again. In themeantime, a total of900m (2,700 ft) hadbeen installed.

On the day of the visit, asection of 80m (240 ft)had to be replaced underthe protected "devil'sbridge”. In view of thedense and compactedsandy soil conditions,the Grundocrack ham-mer had a tendency tobounce back-and-forthproducing vibrations andas the City Engineers didnot want to take anyundue risks with structu-ral damage to the bridge,it was decided to exca-vate a 40m (120 ft) sec-tion under the bridge.This enabled the burster

Front expander with HD-PE pipe ad-aptor in which the Goliath pipecracker is situated.

The 20 t Grundowinch in position,located over one of the manholes.

One of the two parallel connectedcompressors powering the hammerwith outputs of 12 and 8 m3.

PARK OF CASTLE SANSSOUCI

54

A PIPE-CRACKING

JOBSITE IN THE

PARK OF CASTLE

SANSSOUCIDue to the rigidity of thenew larger diameter,heavy wall HD-PE pipes,former pipe slump werecompletely compensatedfor during the pipe-pullingprocess. Special concre-te slabs had been produ-ced for the man-holes

and connection adaptors(from the HD-PE pipe toconcrete connections)had been specially desi-gned for this project.

Thanks to the Grun-docrack technique, con-tractor Hüttner fully metthe dead-line imposed bythe City Engineers ofPotsdam and on Fe-bruary 21st, 1997 theentire project was suc-cessfully completed. Theefficiency and cost-sa-

ving aspects on this pro-ject were due not only tothe sophisticated and pro-ven pipe cracking system,but also by the efforts ofthe highly qualified, moti-vated and experiencedoperators.

The flood water cleaningsystem that had been builtto separate dirt particles inthe lake water.

Entry from the flood water clea-ning system into the river Havel.

The Goliath pipe cracker arriving in the target manhole.

Task: Renewal of a drinkingwater pipe over a totallength of 800 m.Old pipe: Bitumen-coated steelpipe ND 250Damage: LeakageNew pipe: PE-HD long pipe 20 mOD 225 PN 16

In the course of a drinkingwater pipe renewal in thepremises of the KruppEdelstahlprofile companyin Siegen/Germany 800 mof leaking bitumen-coatedsteel pipes ND 250 had tobe replaced utilising thepipe bursting technique.The installation was car-

Machine / equipment: Grundocrack Herkules.Expander OD 225 mmwith PE-HD connectionpipe to re-direct the ex-haust air into the annulusbetween new pipe andsoil.Special bursting sleevewith two exchangeableblades.

ried out by contractor Sieg-fried Sommer, Eschen-burg/ Wissenbach / Ger-many. This company hasalready gained experiencein pipe bursting.

The machine used was aGrundocrack type Herku-les, which had been equip-ped with a special burstingsleeve to crack the cast-iron pipe joints.To avoidcontamination of the drink-ing water pipe with conta-minated exhaust air fromthe pipe bursting hammer,the air was re-directed intothe annulus between newpipe and soil.

The special blades of thebursting sleeve divided theold pipe into two semi-

shells which were dis-placed into the surround-ing soil.

Thedepth of the slightlybent drinking water pipewas laying in a depth of 2m to 3.50 m. The pipe bur-sting process was carriedout in several sections, thelongest section was 172m. Altogether, 9 pipe sec-tions with a length of 20 meach were welded to-gether. The ma-chine was sup-plied with 10m3/min com-pressed air. Thewinch used wasa 12-t-Grundo-winch capstan

The blades of the bursting sleeve cutting the steel pipe into two semi-shells.

winch. The high operationspeed only slowed downwhen cracking the cast-iron joints. Grundocrackreplaced 172 m of steelpipe in only 2.5 hours (ap-prox. 80 m/h excl. set-uptime).

Due to the low surface fric-tion this outstanding instal-lation speed was alsoachieved with the othersections.

View from start to exit pit.

The blades of the bursting sleeve cutting the steelpipe into two semi-shells.

The new pipe ready for installation.

Arrival of the pipe burstingmachine in the target pit.

Pulling of the new HD-PE pipe into theold steel pipe.

with Grundocrackwith Grundocrack

to run through the oldpipe at a reduced air pres-sure and speed and thissection was completed injust 35 minutes. Normaloperating speeds (exclu-ding preparation) on thisproject turned out to be atan average of 50m/hour.

When surfing in the Internet,take your time to have alook at our redesignedhome-page. It gives youample information aboutour systems of trenchlesstechnology and pipe-fa-brication machinery. Novel-ties are also presented aswell as the contact addres-ses of the TT Group compa-nies.Via e-mail get in touch withus to obtain additional infor-mation, catalogs or videotapes or register for one ofthe numerous training semi-nars.

Via online you have accessto the latest TRACTUELLnewsletter to load it intoyour computer, order aprinted copy or just have alook.

Our e-mail addrOur e-mail address:ess:IntInterernational: enational: exporxpor t@trt@tractacto-to-technikechnik.de.deGerGermanmanyy: mar: markeketing@trting@tractacto-to-technikechnik.de.de

VVisit our neisit our new homep@gw homep@ge e at http://wwwat http://www.tr.tractacto-to-technikechnik.de.de

76

The German town ofChemnitz has long beenconsidered the cradle ofthe automobile and textileindustries in Germanywhich, however, had de-teriorated over the last fewdecades in former EastGermany. While these in-dustries have slowly fadedaway, the glamour of thegood old days can still beseen in the architecture ofbuildings and residential vil-las such as in Chemnitz-Brühl, remind- ing visitorsof the former wealth of the

Pipe replacement without open-digging

GRUNDOCRACK meets achallenge in Chemnitz

Pipe replacement without open-digging

GRUNDOCRACK meets achallenge in Chemnitz

city. The state of suchbuildings has graduallydecayed and they arenow awaiting financing forrenovation. But renovati-on of buildings above gro-und is just one of the pro-blems facing the city.More dramatic, yet lessvisible is the damage ofthe existing infrastructureunder the ground whereleaking water, sewageand gas pipes represent aserious risk and damageto the environment, not tomention the economicloss of valuable drinkingwater in leaking pipes.

Shortly after the fall of thewall, once separatingEast and West Germany,contractor Hüttner rea-l ised the enormouspotential of future work inthe renovation business.Having seen a numberof demonstrations withTracto-Technik pipe-bursting equipment, Mr.Hüttner started its ownrenovation works andnow employs 240 mem-bers of staff. "Our earlydecision to enter into thisbusiness of renovation,requiring quite considera-ble investments in per-sonnel, training andequipment, starts to pay

off”, says company ownerand chairman GunterHüttner. "The traffic pro-blems in our city are enor-mous, even without addi-tional jobsite restrictionsand pits all over town. Thecity management is grate-ful for every initiative forinstalling and renovatingthe infrastructure withoutcausing additional trafficdisruption. Our decision togo trenchless has beenmet with much appreciati-on by the city officials”.Renewing a leaking pipe

with the Grundocrack sy-stem is almost the onlymeans, when the existingpipe has collapsed and re-lining (inserting a smallerdiameter pipe into the oldpipe) is not possible, whenupsizing the original pipediameter is required in viewof a growing number of cu-stomers in the gas, waterand sewage industry.Heavy traffic and the sub-sequent pressure havecaused many pipes tocollapse and the inspec-tion of existing pipes usingTV cameras generally givesa clear picture of futurechallenges still lying ahead.Having acquired extensive

The new HD-PE pipe DN500 (560 x 31.7 mm).

Grundocrack GOLIATH ispulled through the new pipe.

By-pass to keep gas custo-mers connected to the gassupply during the burstingoperation. �

experience with the repla-cement of sewage andwater pipes, contractorHüttner now takes on thechallenge with cast irongas pipes, which also re-quire replacing.

In the Further Street inChemnitz, the residentshad alerted the city offici-als as the strong odour ofgas indicated an obviousleakage. A 140 m sectionof the gas pipe needed im-mediate replacement asformer leaks had alreadybeen repaired by installingrepair collars. However,the general state of thepipe was so bad that it had

Butt fusion-welding of the 16pipe segments, each 6 mlong, took 1.5 workingdays.

to be exchanged comple-tely. In view of the growingnumber of gas customersconnected to the network,a 180x16.4 mm HD-PEpipe was chosen to repla-ce the old ND 100 castiron pipe.

To save time, the singleHD-PE pipes had beenpre-welded to lengths of12m before arriving on thejobsite. A Grundocrack180mm type Olympuswas chosen for the job, fit-ted with a special Tracto-Technik pipe-burstingsleeve of 250mm and anexpander of 237mm. Thesize of these accessorieswas chosen in view of thelarge number of repairjoints, which were to be

expected in thecourse of thepipe repla-cement. A10-t-winchwas positio-ned at the exit

pit, the winchrope connectedto the front ofthe Grundocrack

hammer and theHD-PE pipe butt-fused to the ex-pander with a

HD-PE pipe adaptor.

Thanks to its dynamic per-cussive hammer action,the Grundocrack then pro-ceeded to burst the oldpipe, displacing the bro-ken pipe fragments intothe surrounding soil. Theenormous impact of theGrundocrack hammer wassufficient to break not onlythe pipe, but also the re-pair joints while the Grun-dowinch pulling force waspre-set at only 2.5 tons,assisting the Grundocrackon its way through the oldpipe."Tracto-Technik has beenthe leading pioneer in the

pipe-bursting techniqueand supply of adequate,reliable equipment”, saysGunter Hüttner. "The ex-perience the TRACTO-TECHNIK staff has offeredto us as well as the manysmall, but highly efficientaccessories have helpedus immensely with ourdaily work”.

On the Chemnitz jobsite,the total length of 140mwas broken down into 2sections: 1: 55m; 2: 85m.In the 2nd section, a totalof 10 house connectionshad to be connected. Tokeep customers suppliedwith gas during the pipe-replacement, a by-passwas set up, using a HDPEpipe. Relining was usedto exchange the houseconnections (laterals) byinserting a ND 32mm pipeinto the former ND 50mmpipe.In view of the extremelyshallow installation of the

...more at

...more at

Bauma Bauma ‘‘99 88

gas pipe (just 0.85mdepth), the Grundocrackwas run through the pipeat reduced speed (air sup-ply), yet the total length of140m was replaced, thenew pipe being towed di-rectly into place in just 1.5hours (without preparationworks).The city officials and con-tractors, who had been in-

vited to witness this jobsi-te, were impressed by theefficiency of the equip-ment but also of the Hütt-ner staff. The very samecompany had recentlyreplaced a total of 1,300mof DN 400 sewage pipe bya DN 500mm HDPE pipeat the famous Sanssoucicastle in Potsdam (nearBerlin).

The Grundocrack with bursting sleeve at the starting pit.

The Grundocrack arriving in one of the pits.

Grundowinch in the exitarea.

98

mitted a bid to combinepipe bursting with opencut. The company alsohad a creative bypassplan.

Triad was awarded thecontract based in part

because of its ability toprovide pneumatic pipebursting. „With bursting,we could offer less disrup-tion to the public,“ said

Tom Kryfko, Triad projectmanager. Triad owns a Ko-loss Pipe Rammer, manufac-tured by T.T. (Group). Kryfkohad become familiar withpipe bursting after networkingwith bursting contractors andwitnessing product demon-strations at trade shows inthe early 1990s. To arrangefor the proper bursting equip-ment, Triad Inc. contactedpipe bursting specialist MikeSchwager at TT Techno-logies USA. After consideringthe composition and diame-ter of the reinforced concretepipe, the degree of upsizing,and soil conditions, Triadpurchased a Goliath pipebursting tool to perform theSanta Fe job.

The 18“Ø Goliath tool hasan air consumption of

1,236 cfm. A 20-t dual-caps-

tan Grundowinch constant-tension winch, bentonitepump, air compressor, and37.5“ (OD) rear expandercompleted the trenchless sy-stem.

Wastewater officials haddetermined to upsize all

failing 24“ OD pipe to 32“ OD,including the some 3,000 ft ofpipe designated for bursting.By doing so, flow capacity

would increase by at least80%. However, soil condi-tions in Santa Fe were notideally suited for upsizing.

Unlike glacial till or loamsoils, the cobble and sand

mixture would compact onlyminimally. A degree of soilcompaction is required whena bursting tool‘s expander at-

tempts to create a largerbore for the safe installationof larger replacement pipe.

The replacement pipe was32-“ outside diameter

SDR 21 and SDR 26 HDPEpipe, depending on pipedepth. PE pipe‘s flexuralqualities and on-site fusionproperties allow it to bepulled in behind a burstingtool for one-step installationsfor each length burst. Triaddetermined that 7,500 ft ofthe failed sewer lines wouldbe more economically instal-led via trench and replace.However, 3,200 ft, which ranbeneath busy Airport Roadand some adjacent landsca-ping, was divided into 10 se-parate bursts averaging 320ft each, with the longest runestablished at 450 ft.

Crews arrived in Santa Fein late June 97 to perform

the sewer-line replacements.After implementing an incre-dibly effective gravity feedsewer bypass (which elimi-nated the need for up toeight pumps), crews wereready to burst. TT Technolo-gies‘ Mike Schwager, RickMelvin, and Larry Gross ser-ved as technical advisers forthe bursting portion of the re-placements.

The first three burstsfollowed lines that were

as shallow as 5 ft beneaththe pavement. Utilizing anexpander to accommodatethe new 32 „ pipe led tosome mounding of the as-phalt road surface duringthese specific bursts.

Anyone who has evertraveled to Santa Fe,

New Mexico, has been im-pressed by its beauty. But,regarding the road leading tothe town‘s airport, the SantaFe Wastewater Departmentknew that the community‘sbeauty was only skin deep.

A failing interceptor sanitarysewer line ran for thou-

sands of ft beneath the com-munity‘s Airport Road, whichalso intersected a busy statehighway. The 20-year-oldline was showing excessiveexfiltration. Using inspectioncameras, it was immediatelyapparent that the 24“ Ø steelreinforced concrete pipe wasstill in good condition, butmost of the joints had sepa-rated allowing the exfiltration. Because the city desired a li-

mited amount of disruption,the trenchless method ofpipe bursting was included inthe bid. Landin was alreadyfamiliar with bursting fromprevious work experience.

To determine job specifics,he consulted with Jack

Sullivan of Sullivan DesignGroup. Sullivan routinely pro-vides construction in-spection and observation forthe city. The sewer line wasthe community‘s primary in-terceptor, carrying the majo-rity of sewage from town tothe treatment site. Officialswanted to make certain thatall fail-safes were in place forthe bypass.

As an experienced tren-chless construction

company, Triad Buildersof New Mexico, Inc. sub-

Goliath: NewBurst Re-

cord:

SEWER UPSIZED BY BURSTINGSEWER UPSIZED BY BURSTINGEngineers and offi-cials from the City ofHouston and surroun-ding areas gathered inBaytown, Texas/USArecently to view simul-taneous pipe burstingdemonstrations.

The event, hosted byHouston-based KinselIndustries, Inc., wasstaged at a jobsitewhere crews are wor-king to complete a$715,285 project forthe City of Baytown.

Of the two pipe bursting sy-stems demonstrated, thepneumatic GrundocrackGoliath pipe renewalsystem was provided bymanufacturer TT Technolo-gies Inc. Also demonstra-ted was the static pull pipebursting process fromTrenchless ReplacementSystems (TRS), Calgary, Al-berta, Canada.

For the purpose of the de-monstration, the two pipebursting systems were setup in the same general areaand required to performidentical tasks, which in-volved replacing 104 m(340 ft) of 1120 mm Ø (44“)RCP pipe with 914 mm(36“) HDPE pipe.

As to operation, thepneumatic Grundocracksystem uses a modifiedsoil displacement ham-mer. Cutting blades ofdifferent sizes are fixedon the machine to breakthe old pipe. To enlarge the originalbore so that pipe ofequal or larger diametercan be installed duringthe pipe bursting pro-cess the Grundocrackwas fitted with a 1030mm (40“) front expan-der.

In the insertion pit the burs-ting tool was attached tothe pipe string (914 mm/36“ HDPE). Next, the pipewas inserted by pulling inthe tool, bursting the oldpipe and installing the newpipe "in-place."

The 914 mm (36“) HDPEpipe being supplied for thisproject was manufacturedby Plexco, a division ofChevron Chemical. Plex-co's Jim Stilling says whilethe company supplies alarge amount of SDR-17

pipes to the trenchless con-struction market, it is gene-rally black in color. Not sofor this project. Instead,Plexco worked closely withKinsel to come up with acolor to improve the qualityof TV inspections after the36-inch line was in place. According to Stilling, thegray color selected by thecontractor has dramaticallyenhanced the quality of TVinspections.

In summing up the potenti-al for future pipe bursting

operations, Richard Crox-ton, Kinsel Industries' vicepresident predicted, "Pipebursting will be widely usedto replace aged city sani-tary sewer, water and gassystems throughout thiscountry and in every othercountry where aging infra-structure problems prevail."

The new HDPE-pipe diameter 914 mm (36“)welded from 12m-sections.

The Goliath pipe bursterwith front expander Ø 1030 mm.

Fusion welding of the pipe segments.

241110

Advantages of the new pipe/duct tensioning plate com-pared to the former clamp plate:1) The steel pulling cable can be pre-tensioned. Even during the

longest bores, the PVC and PE pipes remain properly held in therear of the pull sleeve which is in turn secured onto the rear of theGRUNDOMAT.

2) Clamping the steel cable is achieved via cantilever jaws so that theclamping force proportionally increases with the cable pullingtension. The clamping force is no longerdependant on the tensioning effort ap-plied by the Operators when pre-viously, special care had to beobserved.

Tensioning Plate3) No additional tooling is required to attach the tensioning plate,

whereas the former clamping plate required the use of an addi-tional locking Allen key which had proved to be particularly diffi-cult in cold, wet, or dirty operating conditions.

4) Easy to use.5) Additional thumb screw as a safety lock.6) The new tensioning plate is fitted with cable guide pulleys so that

it can be used with a winch in soft soils.7) Shorter in length.

Tensioning plate Type II for protection PVC DN 85-125mmOrder No.: GRU 130 0365

Tensioning plate Type III for PVC pipes DN 140-160mmOrder No.: GRU 130 0366

Tensioninglever

Pulling cable

Safety screw

Cable guide pulley

PVC Protection pipe/duct

for Grundomatfor Grundomat

In 1997 TRACTO-TECHNIKwas looking back at 35years of research, develop-ment and manufacturing ofconstruction equipment.

During all those years theidea of "trenchless techno-logies” for pipe and cable in-stallation was slow to be ac-cepted in many countries.For years specialists of TThave toured Europe andlater on overseas countriesin an attempt to get utilitycompanies world-wide toaccept these techniques forcable and pipe laying pro-jects.

Training distributors andend customers has alwaysplayed a vital part in inter-

national market-ing and for

the past 15years train-ing cour-ses have

been orga-nised by TT

every spring.Well over 10,000 attendantshave been participating atthese seminars, organisedwith specif ic customerquestions and problems inmind. The ever-rising qualitystandards of TT TrainingPrograms are what wil lgreatly insure the group’scontinued success.

A lthough the moundingwas undesirable, it was

also inevitable. There simplywas not enough ‚loft‘ bet-ween the failed line and pave-ment to properly accommo-date the desired upsizing ofpipe, especially consideringthe non-compacting natureof the soil (cobble, boulders,and sand). Trenching wouldhave also required the repla-cement of pavement, as wellas the temporary closingof the highway. Trenching

would have also taken longerto accomplish compared tobursting for those first bursts.Crews worked from manholeto manhole, moving systema-tically down the center lane ofthe highway. The tool waslaunched at an excavatedmanhole, and exited at thenext. Thus, each exit areathen served as the nextlaunch pit. It is important tonote that throughout the enti-re bursting process, twolanes of traffic remained open

for the convenience of moto-rists.Unlike clay sewer pipe,which offers little resistanceto bursting, the issue of rein-forced concrete pipe neededto be uniquely addressed. Acustom 4-inch diametershock valve was required tosupply added pneumaticforce to the bursting tool. Theshock valve allows air pressu-re to build in the line to a de-sired level, and then be relea-sed at a preset pressure tostart the large bursting tool‘spiston into motion.

Crews experienced someminor slowdowns when

they found their initial air com-pressor to be inadequate be-cause of Santa Fe‘s high alti-tude and high ambient sum-mer temperatures. An addi-tional compressor was quick-ly accessed, and burstingproceeded. Although thebursts were challenging forthe crew and bursting equip-ment, at no time did the 20-ton winch reach capacity.There were few laterals forTriad crews to contend with,

allowing the bursting to movealong at a more efficient rate.Two gas lines closely paralle-led a pair of bursting runs.Crews carefully approachedthese installations but quicklybecame aware that the bur-sting process would not dis-rupt these sensitive util itylines.

Despite of some concernsand delays, Triad crews

were able to complete thebursting portion of the sewerreplacement in just eightweeks. With their first bur-sting project completed, theTriad staff had positive thingsto say about the job and theequipment.

T riad has purchased addi-tional equipment from TT

Technologies that can quicklyconvert their pneumatic piperammer into a bursting tool.Concluded Kryfko, „There‘squite a market out there forbursting.“

In directional drilling, moredemanding job conditions,advanced machine capabili-ties, increased diversity ofdirectional drilling applicati-ons as well as greater com-petition mandate responsivetraining approaches.

To meet these growing in-ternational requirements,Barry Powell has beenheading the training depart-ment for di-rectional dril-ling since 96.A-Degrees inMechanicalEngineeringand Interna-tional Busin-ess as well asover 10 yearson multi-cul-tural projectmanagementgive Barry Po-well valuableinsight and ex-perience to-

ward implementing newprograms which are end-re-sult oriented to equip eachcustomer personally withthe necessary know-how forreaching their utmost mar-ket potential.

Already, the newest trainingprograms headed by Mr.Powell have become highlyregarded among Tracto-Technik`s international cu-stomers. Carefully balancedclassroom instruction andhands-on training, high levelof instructor competenceand uti l isation of proven

learning techniques with ad-vanced communication sys-tems are a few of the keyaspects which have beensuccessfully incorporated.

1997 saw a record year forthe number of participantsenrolled in various T.T. pro-duct training courses with alarge percentage attendingduring the colder months.“No doubt that customersare looking for high return in-vestment training over theseslower months”.

TT supports trainingcentre in Argentina

In Argentina the main gascompany Metrogas has re-cently inaugurated a trainingcentre (Centro de Entrena-miento tecnico de Metro-gas) where gas employeesnot only from Argentina, butalso from neighbouringcountries are instructed inthe proper design, use,maintenance etc of gas in-stallations.Tracto-Technik, in coope-

▲ The theoretical part of aTT training course.

ration with Argentinian salespartner NON DIG has offe-red a Grundomat 75 molewith accessories to CET sothat all personnel attendingthe classes can also prac-tically be trained on the useof Grundomat moles.

In the brand-new training centre theequipment was officially handed overto Mrs. Carcagno, Mr. Montano, Mr.Granero from Metrogas.

More than 10,000 customers trained at TRACTO-TECHNIK

1312

propelled forward as thepiston accelerates andimpacts against the rearof the chisel. As thechisel is propelled for-ward compressing thespring, the piston thenimpacts against the frontcasing driving it into thepreviously made bore-hole. As the piston thenreturns, the head furtherpulls the long cylindricalcasing into the previouslymade bore hole.

This two part action hasthe effect of :1) should an ”obstacle”be encountered and for-

to fracture and displacealong its pre-determinedbore path without devia-tion. Result: successfulbores Direct on Target.

The new GRUNDOMATdiameters

130, 145,160 and

180mm will be fitted witha new, patented reversecontrol mechanism. Be-cause of its ease of ope-ration (which has beencompared to the differen-ce between non- andpower-assisted steeringon a car - Servo), thecontrol mechanism hasbeen called a SERVO sy-stem. Switching the hammerfrom forward to reversemode is now easi lycarr ied out using thelever on the combined lu-bricator/control systemduring the bore, withoutthe need of stopping thehammer, without any pullor push movements ofthe air hose, and withoutany premature wear ofthe air hose.

GRUNDOMATS from 45to 110mm, however, willcontinue to be fitted withthe proven TRACTO-TECHNIK control mecha-nism requir ing just aquarter turn on the airhose.

Recommended acces-sories are: Grundoscopeaiming frame; the new

tensioning system forpulling PVC pipes; theUNITHERM compressedair heater and add-on cones for convertingsoil displacement ham-mers into steel piperammers.

ward propulsion hin-dered, the chisel/multi-cutter cone in the reci-procating head will conti-nue ”chiselling” indepen-dently until the obstruc-tion is fragmented anddisplaced

(2) directional stabilty ismaintained and surfacefriction overcome as thecasing is both driven bythe piston and pulled intothe previously made borehole.

The piston weight hasbeen increased, yet theoveral l weight of theGRUNDOMAT has beenreduced, resulting in farmore impact energy.Thanks to the combina-tion/concentration of thisimpact energy of thetwo-stroke action, theGRUNDOMAT continues

Length (mm)

Diameter (mm)

Weight (kg)

Number of strokes (min-1)

max. pipe OD without expander* (mm)

max. upsizing Ø*(mm)

max. pipe OD with expander* (mm)

Air consumpt. (m3/min) at 6-7 bar

1750

130

117

350

110

250

225

2,6

979

45

8

570

40

-

-

0,5

1103

55

13,5

510

45

-

-

0,6

1323

65

25

470

50

75

63

0,7

1443

75

34

420

63

85

75

1,0

1540

85

46

390

75

95

85

1,1

1732

95

64

315

85

105

90

1,2

1685

110

96

280

90

125

110

1,6

1029

65

17

640

50

75

63

0,7

1243

75

28

520

63

85

75

1,0

1350

85

40

460

75

95

85

1,1

1532

95

57

380

85

105

90

1,2

45 P 65 PK 75 PK 85 PK 95 PK

1986

145

168

330

125

250

225

3,3

2002

160

198

330

145

250

225

4,2

2221

180

260

280

160

250

225

4,5

2021

180

229

310

160

250

225

4,2

Switching from reversemode to forward modeusing the lever.

The control hose is safely protected inside the compressedair hose.

55 P 65 P 75 P 85 P 95 P 110 P 180 PK*180 P160 P145 P130 P

P-Version w/ air-controlled reverse mechanismP-Version with ZS control mechanismGRUNDOMAT

Edition 03/98 ESubject to change!*depending on soil type

*PK = short version

Reversemode

Forwardmode

At BAUMA 1998 theTracto-Technik group ofcompanies will be dis-playing the newest gene-ration of GRUNDOMATsoil displacement ham-mers designated P (forPOWER). This new series

has even more impact/energy/ power than thepresent, very successful,Z range.

Feedback from our cus-tomers has resulted inthis even more powerful

GRUNDOMAT P whichstill maintains the uniquereciprocating head de-sign. Whilst the P rangewill officially be launchedat BAUMA ‘98, many ofour established custo-mers worldwide have

had the oppor-tunity of testingand approvingprototypes invarious groundconditions overthe last 12months.

Its main charac-terist ic is in-creased power

Teflon slidePistonHead spring

CasingChisel Sequence of striking� Chisel� Casing

Multi-cuttercone

Roll pins

Reciprocating chisel head

which is achieved by thenew control mechanismand further developmentand improvement of thewell-known patentedmoving head which hasbeen the basis of the in-ternational success ofGRUNDOMAT soil dis-placement hammerssince they were first in-troduced more than 25years ago.

On the first stroke thewhole head assembly is

1

2

Arrival of a Grundomat direct on target.

Introducing a completely NEW range of POWER(P) GRUNDOMAT Soil Displacement HammersIntroducing a completely NEW range of POWER(P) GRUNDOMAT Soil Displacement Hammers

Summary of the ad-vantages:• higher bore speeds due

to the re-designedmoving head assembly.

• more efficient reductionof soil friction.

• the piston weight hasbeen increased, yet theoveral l weight of theGRUNDOMAT hasbeen reduced, resultingin far more impactenergy. Simple air ope-rated reverse controlmechanism.

• no restarting problems, and no kinking of airhoses.

• economic use due tolow air consumption.

• lubricator and controlsystem in one unit.

• control hose safely lo-cated inside the airhose

• change of connection

air hose without disas-sembly of the hammer.

• heat treated compo-nents.

• piston seals preventmetal-to-metal contact.and

• seals topreventair loss.

• effectivecorrosionprotec-tion.

...more at

Bauma...more at

Bauma

1514

which the Taurus Grundor-am was positioned. The lineand level of the first steelpipe was crucial as it wasessential that it was instal-led straight with 100% ac-curacy, as the direction ofthe subsequent pipes de-pended on the precise in-

TAURUS: Pipe Roofing in KoreaKorean Contractor, Sang-shin Construction was facedwith the task of installingthree water pipes of ND3.000 mm under a busymotorway as part of the‘Water Supply ExpansionPlan for the Seoul Metropo-litan Area’. With the KoreanT.T. sales partner, CE In-corporated from Seoul, theproject of pipe roofing,using a Grundoram pneu-matic steel pipe rammerwas discussed and the so-lution approved by the Mo-torway administration.

In order to avoid possiblesubsidence of the Motorwayduring the planned pipejacking process of the largewater pipes , it was decidedto use the proven method ofpipe roofing and to install 39steel pipes of a 508mmouter diameter (20”) underthe total width of the motor-way of 34m (104 ft). Thesesteel pipes were inter-connected by special profi-les over their entire length,thus forming a rigid struc-ture, acting like a roof. In co-operation with the TTGroup, Sangshin Construc-tion studied past exampleprojects whereby “pipe roof-ing” jobs had been carriedout in Korea using Goliath450 mm hammers.

A Grundoram hammer ofsmaller dimensions wouldhave sufficed for this pro-ject, but the contractor insis-ted on purchasing the larg-est of the T.T. range, the600mm (24”) rammernamed Taurus, capable ofup to 2,000 tons of dynamicthrust. This machine is the

The three water pipes ND 3000 above which the “pipe roof”, consisting of39steel pipes interconnected by special profiles, was insalled.

TAURUS: Pipe Roofing in Korea

pipe just one air compressorwas used which is normallyinsufficient to obtain opti-mum impact energy from therammer.However, in this case it wasconsidered sufficient and thefirst pipe section of 12m (36ft) was installed in just 30

which was expected whenthe final water pipes of ND3.000 mm were to be in-stalled.

biggest machine of its type,available in all of Korea sothe Contractor will certainlybe awarded more similarjobs to this using the TaurusGrundoram.

Under the careful supervisi-on of a ramming specialistfrom Germany sent for thefirst training of the SangshinConstruction operators,preparations were made toproduce a solid startingplatform (length = 20m(60ft); width: 25m (75 ft)made of H-beams, onto

stallation of the first guidan-ce pipe. To guarantee theperfect arrival of the firstpipe, a Grundocontrol levelmeasuring system wasused on this job.

To transmit the full impact ofthe Grundoram hammeronto the steel pipe and toavoid flaring of the steelpipe, TT manufactured 4-piece cotter segments wereused to adapt the size of theGrundoram hammer to thediameter of the steel pipe.Cotter segments are desi-gned for ease of positioningand handling. A grade of0.5% was used for the firstpipe which was accomplis-hed by the respective en-gineering firm. For the first

minutes; the next 12m in1 hour while the final sectionrequired 2 hours. When thegrade of the first pipe arrivingin the target pit was accep-ted by the engineering com-pany, an additional com-pressor was then used.

With each additional pipebeing installed, the opera-tors gathered more expe-rience in the use of the Grun-doram equipment and soontwo complete pipe lengthswere installed to the entiresatisfaction of the Motorwayauthority and Sangshin Con-struction. The final structureof the 39 interlocking steelpipes were to be buriedagain, to support any prob-able ground settlement

35 miles away from infa-mous Mt. St. Helens, be-neath the Toutle River nearCastle Rock, WA, a dama-ged crude oil l ine threa-tened to burst. Althoughthe line had been installedat a safe depth, years ofvolcanic run-off (includinglarge rock) had exposed thepipe. Damage and corro-sion was now a fact, and oilline officials wanted to re-medy the situation beforethe line could spill.

KAMLOOPS RETAINEDThe contracting bid wasawarded to Kamloops Au-gering, Ltd. The chosen bo-ring tool was an AmericanAugers directional drillingrig. Because of the comple-xity of the bore, combinedwith a tight t ime frame,Kamloops staff incorpora-ted other trenchless me-thods to make the boremore efficient. Kamloopshad a unique way of usingpipe ramming tools to as-sist directional drilling rigs indiff icult bores. The pro-

cess was to ram a pipe inat an angle, instead of hori-zontally, dubbed a Con-ductor Barrel, is then clea-ned out with an auger, lea-ving a ”clean hole” for thedirectional drilling rig.

The directional drilling rigcan then advance the drillbit through the Conductor

Barrel to the bed rock with-out any steering problemsor complications caused byloose gravel and largerocks. This clean hole alsoallows the bore to start on-target and provides a fric-tion free last leg for productpull-back.

ON-SITEThe 670 m (2200 ft) borewould start 152 m (500 ft)from the river bank, travelabout 21 m (70 ft) beneaththe river and continually arcup until exiting on the side

of a mountain. The bore wasto follow a 1400 m radius.

The pipeline owner speci-fied that all Conductor Bar-rel pipe be removed toavoid complications withthe new oil line. For ease ofof retrieval two diameters ofpipe would now be used,creating a barrel within a

CONTRACTOR KAMLOOPS COMBINESTAURUS WITH DIRECTIONAL RIG

ContractorProfileContractorProfile

barrel. Installed inside andbeyond the 200 ft of Ø 762mm (30“) pipe was 500 ft ofØ 610 mm (24“) ConductorBarrel. This meant that only92 m (300 ft) of the Ø 610mm (24“) barrel would besurrounded by soil, makingit easier to remove.

RAMMING BEGINSKamloops used a Grundor-am Taurus pipe rammer(largest available rammer)to perform the pipe installa-tion. The first 12 m (40 ft)section of Conductor Barrel

was quickly rammed in.The second section wasthen welded to the first.

To suspend the Taurus asit rammed the pipe a Cater-pillar 325 back hoe wasused. Just two hours in theram, crews were alreadypreparing the third sectionof pipe for installation. An

auger was used to removespoils within the pipe.Crews repeated this pro-cess until reaching bedrock,21 M (70 ft) below the river,a few days later.

DRILLING & REAMINGWith the Conductor Barrelinstalled Kamloops crewput their steerable boringsystem on line while true-tracker magnetic wireswere laid to help guide thebore. The tri-cone mudmotor was attached to anon-magnetic drill stem andthe big directional rig wasput to work.

Stem after stem was addedas the line made its waydown the Conductor Barrel.Once bedrock was reach-ed, the initial bore was un-derway. The 178 mm (7“)drill stem travelled flawlesslybeneath the Toutle Riverand under and out of theside of the mountain. Crewsthen attached a Ø 432 mm(17“) reamer to open thehole, followed by a Ø 508mm (20“) reamer. The drillstem was then resent to pullback the waiting 356 mm(14“) crude oil product line.

PIPE RETRIEVALTo recover the Ø 610 mm(24“) and Ø 762 mm (30“)Conductor Barrels the ram-mer was positioned inside aspecial adapter which wasconnected to the final sec-tion of the Ø 610 mm (24“)Conductor barrel. As thetrenchless tools pulled eachsection of Ø 610 mm pipefrom the rocky ground, theywere methodically cut andremoved. The same hadbeen done with the Ø 762mm (30“) Conductor barrel.

CONCLUSIONIn the short span of severalweeks Kamloops workedthrough the problems thedifficult terrain offered bycombining trenchless tech-nologies.

MONTAINOUS OIL PIPE IN-STALLATION MADE POSSIBLE

Crews prepare to install a section of Conductor Barrel withGrundoram Taurus.

The Conductor Barrel was installed at a 15˚ angle, providing a „clean hole“ for directionaldrilling. The bore exited 400 ft higher than the starting point.

Bore path

GrundoramTAURUS

Conductor Barrel

1716

On inner-city directionaldrilling jobsites the bento-nite might be considered areal nuisance in the startand exit area, requiring ex-tensive and expensiveclean-up of the jobsite.Using a vacuum truck maybe a solution - but an ex-pensive one. For this pur-pose TRACTO-TECHNIKhas introduced a new self-priming bentonite, waterand slurry pump, capableof handling even high-vis-cosity bentonite slurry, tobe pumped into barrels orcontainers.

The new Bentomax pumphas a suction capacity ofalmost 400 l/min. Its die-sel engine is electricallystarted, however, in caseof problems it could alsobe started manually.Thanks to its practicaltransportation handle, thesolid frame can be liftedand pulled or hoisted to itsplace of utilisation.

BENTOMAXSelf-priming bentonite, water and slurry pump

The robust BENTOMAX suc-tion pump is delivered witha 4m (12 ft) spiral hose andsuction sleeve with non-re-turn valve. �

BENTOMAX mobile and compact self-primingpump. �

In case of emergency, the pump canalso be started manually.The pump is integrated into a solid steel frame. Due to its handle, the entire unit can be transported or hoisted to its placeof utilisation. �

BENTOMAXSelf-priming bentonite, water and slurry pump

Technical data:

L x W x H: . . . . . . . . . . 1100 x 510 x 610 mmWeight: . . . . . . . . . . . . . . . . . . . . . . 200 kgEngine: . . . . . . . . . . Yanmar Type L 100 AE-Diesel

with electric starter and Emergency manual starterEngine power: . . . 5.8 kW at 2500 rotations/minGear ratio: . . . . . . . . . . . Engine: Gear = 6 : 1Performance: 375 l/min at 500 rotations/min

(approx. 22,5 m3/hour)Accessories: . . . . . Suction hose 4m (12 ft) length,

suction sleeve with non-return valve.

Quality & Service TT Your advanttage

Percussive hammer action ✔ for stony soils including gravelHigh productivity ✔ low standstill and set-up timesMaintenance friendly ✔ long service intervalsEasy operation ✔ short training course required onlyStout concept and design ✔ reliable, long-life expectancyMade in Germany ✔ quality productFirst-class German suppliers ✔ only well-known brands used Friction welded drill stems ✔ solid, lasting, resisting even to impact

hammering

Special design & heat treated ✔ for PE pipes (up to 600 mm Ø), steel pipesaccessories and ductile pipes

Rock-drilling bore head and ✔ adaptable with few modifications to mud-motor some models

Reliable detection systems ✔ high measuring accuracy, accessories exist for all well-known systems

High name recognition ✔ not a "no name product”Efficient use of consumables ✔ economic use of bentonites and additivesEfficient hydraulic power unit ✔ offering extra capacityPerfect bentonite mixing systems ✔ easy and fast slurry preparation and useBentonite mixing and recycling ✔ two operations in one Six models of machines ✔ wide range of applicationsTransporting and storage systems ✔ as per customer requirementsTraining courses ✔ offered throughout the yearOvernight service (in Europe) ✔ minimum downtime35 years of manufacturing ✔ a competent partner at your sideexperience

Main advantages of the individual machines:

Grundopit - with patented quick drill ✔ fast and easy clamp system and break-stem connection system away of drill stem connections

Pit 40/60 - small, short pit launch unit ✔ small pit requirements for urbanapplications

Hit 40 - two machines in one ✔ available for pit or surface launch boresDrill 6.5 and 10 S ✔ optional torque increase to 2,500 Nm12 G/20 S - semi-automatic drill stem ✔ number of operators is reduced to ONEcarousel

12 G/20 S - operation with joysticks ✔ all functions controlable from operator seat 12 G/20 S - self-contained unit ✔ no separate power unit required20 S - TT’s largest & most powerful ✔ high thrust and pull back, high torque

PIT 40/60 pipes ≤ 110 mm Ø and bore lengths ≤ 50 m

HIT 40 pipes ≤ 160 mm Ø and bore lengths ≤ 100 m

DRILL 6.5 pipes ≤ 250 mm Ø and bore lengths ≤ 200 m

DRILL 10 S pipes ≤ 355 mm Ø and bore lengths ≤ 300 m

DRILL 12 G pipes ≤ 450 mm Ø and bore lengths ≤ 350 m

DRILL 20 S pipes ≤ 600 mm Ø and bore lengths ≤ 400 m(Bore diameters and lengths depend on soil conditions

The real VALUE of Tracto-Techniksteerable boring systems...

Pit launch version

GRUNDOHIT 40

Surface launch version

GRUNDODRILL 10 S

GRUNDODRILL 12 G

GRUNDOPIT 40/60*

2 in 12 in 1

* dry bore system without percussive hammer

Quality pays for itself.

Quality pays for itself.

GRUNDODRILL 20 S

...more at

...more at

Bauma Bauma ‘‘99 88

1918

GRUNDOPIT 40/60 bore rigLength ................................................1130 mmWidth ...........................................475-600 mmHeigth ..........................................400/800 mmWeight (without drill stems)......................260 kgLength of drill stem ................................600 mmØ of drill stem.........................................45 mmWeight of drill stem..................................4,3 kgØ of bore head.......................................55 mmThrust ......................................................60 kNPull back..................................................40 kNTorque .................................................600 NmThrust speed.....................................0.04 m/secBackreaming-Ø.................75/90/110/150 mmOuter pipe-Ø.................................... ≤ 110 mmBore length .............................................≤ 50 mMin. bend radius .......................................25 mDetection system...........................8 kHz/33 kHzDetection depth.........................................3-4 mMin. pit dimensions (L x W)...............1,2 x 0,9 mHydraulic power packL x W X H .........................745 x 600 x 720 mmWeight...................................................110 kgEngine ....................................................HondaOil tank ........................................................7 lOperating pressure .............120 / max. 140 barFuel tank ....................................................7.2 lEngine output ..........................................13 kWOil flow ...............................................40 l/minWater tankL x W x H..........................750 x 400 x 800 mmTank capacity ............................................200 lWater pressure .......................................60 barRequired oil flow ....................................8 l/minFilter unit .......................................2 water filters

GRUNDOPIT 40/60 - TT's smallest: easy to use steerable mini bore rig for houseand many other types of serviceconnections where access to work-ing space is limited.

The pivotable operatingpanel with gauges to mo-nitor system and water pressure.

Waterpump

Water tankHydraulic power pack

Bore rig

Drill stem box Subj

ect t

o ch

ange

! / E

ditio

n: 0

2.98

Simply ingenious...

Grundopit 40/60, a hy-draul ical ly operatedsteerable bore r ig, isideally designed to installhouse connections forcable, gas, water andsewage pressure pipes.Depending on the soilconditions pipes up to110 mm Ø, over borelengths of up to 50 mand more can be instal-led.

Due to its compact di-mensions of only 1130 mlength, 475 mm widthand a height of 400 mm,Grundopit can be laun-ched out of smallest ofpits or manholes.

The complete unit in-cluding water tank, hy-draul ic power pack,water pump and dri l lstem box can be trans-ported in a transport ve-hicle or a small van. Fourhydraulically operatedtelescopic bracing sup-

ports allow perfect align-ment and firm anchorageof the bore rig in the star-t ing pit to effectivelytransmit the full thrustand pul l back energy

onto the drill stems. Dueto Grundopit‘s low pro-file, the launch pit can beused for bores in both di-rections, as its low profileis identical to the invert

level of the proposedbore.

A further distinct advan-tage is i ts simple twopart construction whichal lows for head stockslide and support frame(total weight 260 kg) tobe transported individu-ally by hand without theneed of any additional lif-ting equipment.

Moreover the bore rigcan easily be assembledwhere working space isrestricted.

Basic equipment (without powerpack and detectionsystem):• Two part bore rig, drill

stem clamp• Operating panel• 25 drill stems in a box• Bore head with angled

steering surface• Backreamer and swivel

coupling• Hose package

The unit is powered by asmall hydraul ic powerpack with a 13 kW petrolengine. With 60 kN thrustand 40 kN pul l backGrundopit also offers apowerful performance.

Basically, the bore is car-ried out without boringfluid; only the bore headand sonde have to becooled with water whichis supplied via a 200 lwater tank, connected tothe bore r ig and f i l ledfrom a domestic watersupply.

Rotation, thrust and pullback are controlled via apivotable and detachableoperating panel. Systemand water pressures areregulated in the usualway and monitored byindividual pressure gau-ges.

The 0.6 m long specialdrill stems with patentedinstant plug-in lock are

only screwed on onceautomatically after fas-tening in the rear retainer.During the pilot bore andpipe pulling stage, thereare therefore only twoturns required. Thissaves on both time andenergy. The drill stem isheld by a clamp whichcan either be operatedmanually or by foot. Only

one person is necessaryfor the boring operationand the main operatorstands on a protectionscreen during the bore.

As with other steerableTT-boring systems a pilotbore of 55 mm Ø is es-tabl ished prior to in-stalling the pipe or cable.For controlling the boringprocess, a mini transmit-ting sonde with a detec-tion depth of 3 - 4 m, isincorporated in the borehead. The bore directionis controlled by the ang-led bore head steeringsurface. After the pilotbore the bore head isexchanged for a back-reamer and the pipe ispulled in directly behindthe backreamer using thepurpose biult accessoryparts of Tracto-Technik.

This small Grundopit unitis unique due to itspractical modular con-struction and simplicityto use. Also, as it is very easy tooperate after brief insc-

tructions, we recom-mend Grundopit as anideal beginners steer-able bore r ig forestablishing house con-nections and bores un-

...or by foot.

The patented instant plug-inlock which holds the drillstem.

The drill stem clamp can either beoperated manually...

der road junctions or asa supplementary unit tolarger, less portabletypes for longer bores.

GRUNDOPIT bore rig and operating panel ready for trans-port.

2120

The new small size steerable boring system,GRUNDOHIT 40 is available as a pit-launch or alter-natively a surface-launch unit.The GRUNDOHIT 40 has been designed for pipeinstallation projects up to ND 150 (6”) and borelengths up to 100m (300 ft). The following recentjob application illustrates the multiple applications ofthis small size steerable boring system.

The Adolfsburg castle inOberhundem / Germany,dating back to the 17thcentury had been split into60 apartments a few yearsago. However, beingunder historic protection,any type of constructionwork on the outside of thebuilding had to complywith the original style ofthe castle. For years, theowners of the apartmentshad fought in vain to recei-ve permission to install sa-tellite dishes for their tele-visions. Installing any sa-tellite dishes on the outsi-de of the building wouldconsiderably denigratethe historical appearanceof the building.

Initially, the owners of thebuilding had contacted alocal contractor to obtainprices on the open trenchmethod of installing theTelevision cable connec-tions to each apartment.However, conventionalopen cut methods wereruled out because:

1) the inner courtyard ofthe castle had very restric-ted space;2) a small canal separatedthe inner court into twohalves;3) impossibility of access

for any large sizeconstruction equipmentsuch as back-hoes;4) nuisance and disrupti-on to the occupants ofthe apartments.

T.T. Group companyChairman WolfgangSchmidt, himself being anadmirer of the castle,

made the suggestion toinstall the necessary un-derground cables using aGrundohit 40, whichcould easily access theinner courtyard of thecastle. A total of threebores had to be com-pleted of about 40m (120ft) each.

The advantages of theGrundohit 40 becameapparent:1) the small size bore unithas minimum surfacerequirements;2) due to the integrateddouble percussive impact

hammer the expectedback-fill and foundationsof former buildings onthe site of the currentinner courtyard could betackled effectively;3) the jobsite was sche-duled to last a maximumof 3 days, keeping incon-venience to the residentsdown to a minimum;

4) surface reinstatementwas kept to a minimumin view of the surfacelaunched bore.

A depth of 2.6m (7 ft) wasspecified as the generalinstallation depth, takinginto consideration thebore had to also go be-neath the canal in thecourtyard.The first bore of 40m (120ft) was headed north toconnect the northernapartments. The subse-quent bores required aslight curved bore to thewest, both bores werescheduled to arrive in thecanal.

Due to the wet soil condi-tions, the use of a bentoni-te slurry was not consi-dered necessary andtherefore the T.T bento-nite and slurry pump, Ben-tomax, was simply usedto pump water from thelittle canal via the mixingsystem into the Grundohitbore rig.

All three pilot bores includ-ing back-reaming - a totalof 120m (360 ft) - weredone in two and a halfoperating days. Quite anachievement consideringthat the soil conditionsturned out to be evenworse than expected.This required the pilotbores to be carried outusing only the percussivehammer as little forwardmovement could be a-chieved using hydraulicthrust alone. Yet anotherexample of how Grundo-hit, with its unique percus-sive hammer action, wascapable of solving a prob-lem where other non-im-pacting boring systemswould certainly havefailed.

GGRUNDOHITRUNDOHIT 4040

Operating panel for all system functions.

One of the predominant HD-PEpipes put into place.

The T.T. demonstration truck with small size bentonite mix-ing system, hydraulic power pack and work bench.

▲ Backreamer with HD-PE pipeconnected.� Detection of the bore headusing an RD 385 transmitter andreceiver.

▲ Two of the bores had to arrivein the middle of the small ditch inthe inner courtyard of the castle.

▲ Disassembly of the bore head.

The Grundohit with its rubber-tracked undercarriage.

22 2423

Early November 1997 thepractical part of the train-ing course for a newGrundohit contractor inItaly took place in theTripoli street in the city of

On November 20th, ‘97the staff of water com-pany Aguas de Murcia/Spain effected their firstreal-life site when pullingan HD-PE water pipe withtheir new Grundohit 40.

The bore was startedfrom a pit at 1.50m (6 ft)depth. The pilot bore andpipe pull ing required atotal of just 5 hours. Con-gratulations to the opera-tors on their first job.

French contractor SDEL-VATAN has obtained amarket by French EDF-GDF (electricity/gas) to in-stall high voltage cables.Part of the project was a60 m crossing to install a140mm HD-PE pipe underthe A 20 motorway near

Brian. To install this pipethe contractor chose theGrundohit 40 because ofits integrated percussivehammer, which the con-tractor claimed essential inthe extremely stony soilconditions in this part ofFrance.

Florence/Italy. A total of4 HD-PE ducts of 63mm(2”) were to be installedfor the Italian Telecom onan operating depth of1.80m (7 ft).

The GRUNDOHIT bore rigwas launched from thesurface. Thanks to theideal soil conditions (clayonly), water only (no ben-

1. Italy1. Italy

Pulling the 4 HD-PE ducts.

Surface launch of the Grundohit bore rig

tonite mud) was used forthe pilot bore. In just 1operating day the pilotbore, back-reaming andpipe pulling steps werecompleted to the entiresatisfaction of the con-tractor and his operatorson their first real-life site.

Taking into consideration thesize and weight of the GRUN-DOHIT, it is to be considereda "mini size” directionaldrilling unit, to be launchedalternatively from a pit orfrom the surface.

Pit-launch applications offernumerous advantages as thebore rig can be securedagainst the walls of the pitand does not requireadditional stake-down sys-tems. However, other site re-quirements may call for asurface launch system. Hereis where the Grundohit comesin as the ideal solution.

The following case studiesshow a variety of applica-tions of this small unit, cap-able of installing pipes up to160mm (6”) and cover borelengths up to 100m (330 ft). Back-reamer with swivel pulling the pipe. �

Further application examples of GRUNDOHIT 40...

The 60m bore was startedon one side of the motor-way, without any restric-tions to the heavy motor-way traffic or the parallelservice lane. On this parti-cular jobsite the advanta-ges of the bentonite wereclear to everybody invol-ved: due to the right bento-nite viscosity, the bore tun-nel of the pilote bore wasstabilised so that pre-rea-ming steps and final PEpipe pull ing were madepossible.

The jobsite started on June18th at 2 pm. In the extre-mely stony soil the percus-sive hammer had to beused almost continuouslyduring the 5 hour pilot bore.In view of the soil condi-tions, the operators decid-ed to make different pre-reaming steps before thefinal pipe pulling. Each pre-reaming step (100/150/190mm) took 2 hours. The finalpipe pulling was done onJune 20th and at 4 pm thepipe had been installed.

2.2. Spain

3. France3. Fran-

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In about November 1996,the Milnerton Golf Estateidentified the need for addi-tional irrigation of the Golfcourse. This decisionresulted in the upgrading ofpumping facility, which inturn lead to the require-ment for an additional elec-trical supply for the pum-ping station. This supplywould involve the City Elec-trical Engineers Dept. fortheir commitment to thisproject together with theMilnerton Golf Estate, re-presentatives Hancock &Paterson electrical consul-tants. Both parties agreedthat there was only one

practical solution to theproblem that they werefacing. The electrical sup-ply would have to be rou-ted beneath the Otto DuPlessis road (which carriesa great deal of traffic) &across the very sensitive“Rietvlei Estuary” which isa Protected Natural Envi-ronment. Once this propo-sal was presented to thelocal Metropolitan Councilin Milnerton, a meetingwas held, to establish cer-tain environmental con-trols that were deemedabsolutely necessary.Amongst the group, con-sulting this issue, was MikeThwaits, representingRambore cc.

His proposal, was to under-take the laying of cableducts by “Trenchless” me-thods, at two positions.Rambore cc, chose to usetheir Grundodri l l 10 Ssteerable boring system.This steerable Boring Sy-stem would prove to be theideal equipment to underta-ke such a project. It isequipped with a RD 385RadioDetection trackingsystem.

One installation approx. 24m long beneath Otto DuPlessis road, and anotherof approx. 98 m length be-neath a service road & river

in the “Rietvlei Estuary”.Once all the necessaryplanning & preparation,was completed, the sleevebeneath Otto Du Plessisroad was installed in oneday. After the week end,the task of installing the se-cond cable duct was star-ted early the following Mon-day. Once the steerableboring rig had been set-upthe first part of this opera-tion began. This pilot borewas “steered” along a pre-planned route beneath theservice road embankment& downwards from the sur-face, to a safe depth belowthe river bed (2m coverdepth). Once at the targetdepth the bore was steered

on a level course before di-recting the bore upwards,continuing in a gentle arc.After approx. 98 m of drillstems had been installed,the bore head “punched-out” to surface on the farside approx. 20 m awayfrom the river’s bank, preci-sely on target. Once thebore head had been repla-ced with the necessary too-ling to open & prepare thebore, the pipe was connec-ted to the pipe attachmenttooling. The “back-rea-ming” & simultaneous pull-ing in of the long cable ductwas second & final stage ofthe operation. (It is someti-mes necessary to carry outintermediate “pre-reaming”to prepare the bore pathprior to pull ing in thePipe/cable). However, bymonitoring the progress ofthe pilot bore, it was deci-ded that the soils would ac-cept direct upsizing frompilot bore to final size with-out this pre-reaming proce-dure.

Although, in some placesalong the bore path, the soilconditions were quite diffi-cult, the Grundodrill 10S,together with highly skilledoperators, successfullycompleted the “River Cros-

sing” in a single 10hr shift.The many advantages ofusing “Trenchless” con-struction methods wereacknowledged by all par-ties concerned.

The remaining section ofthe cable route was me-chanically open-trenched,prior to the 300 m length ofcable installation, whichwas successfully installedwith minimal disruption tothe environment.

This was carried out by L.Thompson & Co. (Pty) Ltd.(Electrical Contractors).The President of the Fri-ends of Rietvlei, reportedthat “certain members ofthis organisation who mo-nitored the entire operationwere impressed with thespeed of the operationwhich meant a minimum ofintrusion in to the sensitiveareas of the estuary”.

As far as we know, thiswas the first river crossingin South Africa, using asteerable boring system.

Arrival of the bore head on the

other side of the river.

Detection of the bore head during the directional drillingjob.

soil conditions did not causeany headache in the planningstage of the project, a parti-cular problem was to be sol-ved yet: along the coast steelpiles had previously been in-stalled down to 15m (45 ft) tosafeguard the coastl ineagainst destruction causedby vessels arriving in and de-parting from Copenhagenharbour.

K nowing the exact position,depth and rotation of the

bore head at all times duringthe bore is the key to its suc-cess. The position of the bore

head is usually monitoredusing a transmitting sondeintegrated in the bore headto a receiver above the surfa-ce and it is noted in the borereport sheet to compare itwith the predetermined,planned bore profile. In thiscase the use of a regular,walk-over detection systemwhich is mostly used in miniand midi size directionaldrilling systems, was ruledout as the depth far excee-ded the capacities of most ofthe existing systems and theexistence of the steel sheetpiles were very likely to in-fluence the signals of the de-tection equipment.

C ontractor Jørgensen tur-ned to Tracto-Technik in

the fall of 1996, requestingto use one of the bore rigsthat has been fitted with acable-type detection sys-tem. Unlike walk-over sys-tems, the cable-type detec-

tion system is not influencedby any steel objects orobstacles in the bore course.End of August 1996 a Trac-to-Technik team thereforeset out for Denmark usingtheir Grundojet M 15 with 15tons of thrust and pull-back,fitted with the describedcable-type detection sys-tem.

T he first bore of 42m (130ft) required 2 hours for the

pilot bore and 1 hour for theback-reaming and pulling aHD-PE pipe 110 mm PN 6. On day 2 of the jobsite and in

during back-reaming after 62m of bore a drill stem brokeand the bore had to be re-peated on day 3. Eventhough the water level nearthe coast was only 2 to 3m (6to 9 ft), rough weather duringthis back-reaming stepmade the operators onthe boat quite unhappy andsea-sick.

E xchanging the pilot boreaccessories for the back-

reaming accessories on topof a boat on shaky "ground”turned out to be a special ex-perience for the operators.Nevertheless back-reamingof the 62m (190 ft) pipe HD-PE 110 PN 6 required only 3hours.But during the longestbore of 93 m (300 ft) theoperators met a much hardertype of soil, extremely hard,compacted, crystalline sand-stone. Using the bentonitejetting system of the Grundo-jet M 15 did not suffice toreach the target point.

T he jobsite was stoppeduntil the following week

when a mud-motor and auxi-liary equipment was broughtto the jobsite. Contrary tonormal "jetting”, a mud-motor (a bore motor drivenby bentonite pressure and

flow (Rock-Drilling-System)is capable of cutting throughrock. To effect the pilot boreeffectively, a special tri-conebore head was selected andthe pilot bore from shorebegan almost unnoticedfrom large vessels and crus-aders as the normal ship traf-fic continued without anydisruption.

S everal technical aspectsslowed the general boring

speed down. Using thecable-type detection systemalso reduces boring speedas the cable connection aftereach 3m (10 ft) drill stems re-quires several minutes - evenby an experienced operator.On September 10th the last

back-reaming step wasdone and the last of the 3sea-cables put into place.

F or European customersTRACTO-TECHNIK holds

a bore rig available, fittedwith a cable-type detectionequipment while the typicalrock-dri l l ing accessoriessuch as mud-motors and tri-cone bore heads are usuallyrented rather than purcha-sed at this moment of time.

I n the summer of 1996,Danish contractor Hans

Jørgensen & Son was facedwith a particular problem as3 sub sea cables had to beinstalled on the sea bed ofthe Baltic Sea and wereabout to reach Copenhagenshoreline. However, theproblem of connecting thesub-sea cable up onto themain-land had yet to beresolved.

I n this context they hadsuggested to carry out 3

independent bores from themain-land (shore) about 50to 60 m (150 to 180 ft) longunder the ocean bed, theback-reamers and HDPEpipe for the sea-cable to beattached under water usingdivers. Soil conditions were indi-cated by the Port Authoritiesto be moraine chalk down toabout 20m (60 ft). While theindication concerning the

View of the starting areawhere a small size pit hasbeen dug ashore to receivethe bentonite slurry flowingback to the starting point(the boat seen in the back-ground is the target point).

The tri-cone bore head.

Grundojet M15 in the Portof CopenhagenGrundojet M15 in the Portof CopenhagenMilnerton Golf Estate -

upgrade to irrigationMilnerton Golf Estate - upgrade to irrigation

26 27

M ost German ma-nufacturers havealways had a

tendency to very modeststatements about thecapacities of their equip-ment. TRACTO-TECH-NIK does not make an ex-ception here. When con-tractor Musing from Frie-deburg/Germany firstmentioned a particularproject that he wasplanning to execute withhis GRUNDODRILL 12 G,the project had to bethoroughly studied con-cerning the technical pa-rameters of the machineto be used.

CONTRACTOR MÜSING MEETS THE BIGGEST CHALLENGE...FOR HIS STEERABLE BORING SYSTEM GRUNDODRILL12G

M üsing has beenusing steerableboring systems

for some time but even forhis operators this particu-lar project was quite achallenge: In a city nearOsnabrück (Germany),the SAG required 3 HD-PE pipes of 200x11.4mm(for high voltage powercables) as well as 2 HD-PE ducts (for telecom ca-bles) of 50x4.6mm to beinstalled in one bore overa total distance of 225m.

T o complicate mat-ters, the bore coursewas not in a flat area,

but included a borethrough shattered rock,downwards with a totaldifference of 20m bet-ween the starting pointand the lowest bore cour-se, to pursue under 11railway tracks and thencome out in a predetermi-ned area after a total borelength of 225m. Visibilityof the target area was nil,due to the height differen-ces and trees and shrub-bery on both sides of therailway embankment.

T he project seemed tobe a very stern chal-lenge and without

the experience of the boreteam, assisted by TRAC-TO-TECHNIK staff, con-tractor Müsing would not

have started the bore. Soilcores had shown the first60m to consist of shatte-red rock, fol lowed byabout 40m of sand withstone inclusions. "Withoutthe percussive hammeraction, an integrated fea-ture of the Grundodri l lbore rig, the pilot borewould not have beenfeasible”, said contractorMüsing after the suc-cessful pipe installationproject.

E xact planning of thebore course was anabsolute must on

this project. The borecourse showed a diffe-rence of height of up to 20

meters at one particularpoint, with in steep angleof penetration during thepilot bore to get down tothe requested coverunder the railway tracks.The operators followed thepredetermined bore courseexactly and they indeedmanaged to effect the pilotbore in just one operatingday, much to the surprise ofsome city off icials andspectators, who couldhardly believe their eyes.

U psizing the 60mmpilot bore to house3x200 plus 2x

50 mm HD-PE pipes re-quired different back-reaming steps:

1st pre-reaming using a235mm back-reamer2nd pre-reaming using a310mm back-reamer3rd back-reaming using a435mm back-reamerwith carbide bits

Having used a diffe-rent type of steer-able boring system

in the past, contractorMüsing admitted that theuse of the TRACTO-TECHNIK bentonite mix-ing system had played animportant part in the suc-cess of the bore. Theright bentonite viscosityand flow helped stabilisethe bore tunnel, greasethe reaming accessoriesand HD-PE pipe and, lastbut not least, transportsoil particles out of thebore. A total of 4 tons of aspecial bentonite namedBentonyl was used,equalling about 160 cbmof bentonite.

D uring the pilot bore,a member of thecrew had been

butt-fusing the different12m sections of HD-PEpipes to single lengths of225m each. Total pipepulling took just 7 hours.Including preparations,butt-fusion of pipes, pilotboring, pre-reaming andback-reaming, the totaltime required for installing3 x 200mm plus 2 x50mm HD-PE pipes was4 operating days, leavingcontractor Müsing verysatisfied with his equip-ment.

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