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AT - Pipe Umbrella System
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Introduction
The AT - Pipe Umbrella System is a
pre-support measure used in weak
ground conditions in conventional as
well as mechanized Tunneling. Pipe
umbrella pipes increase the stability in
the working area by transferring loads in
the longitudinal direction and decrease
excavation induced deformations.
The system increases safety in the
working area.
Beside this standard usage, the system
is often applied to increase stability in
portal sections and for the re-excavation
of collapsed sections in underground
construction. Another application area is
ground improvement and waterproofing
in combination with all tunnel construction
methods.
Contents
Introduction ........................... ...................................................................................... 3
Fields of Application ........... .........................................................................................4
Main Advantages ......................................................................................................... 4
System Description ...................................................................................................... 5
System Components .................................................................................................... 5
Specifications ............................................................................................................... 6Technical Features ....................................................................................................... 7
AT - Drilling System ...................................................................................................... 7
AT - Pipe Couplings ..................................................................................................... 8
Installation Procedure ................................................................................................ 10
AT - Pipe Umbrella Automation Unit .......................................................................... 11
Accessories ................................................................................................................ 14
Further References .................................................................................................... 14
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Fields of Application
Main Advantages
Advances in weak ground and ground
conditions prone to subsidence
Advances in alpine fault zones
Installation with conventional
drill jumbos
Execution of pipe umbrella drilling
with on-site personnel
Simple and robust system
components
Fast self-drilling installation
Smallest possible stress relaxation
due to an immediate support of the
borehole wall during installation
Accurate installation due to a
minimized annular gap
Length of pipe umbrella pipes can be
adapted to constricted space
Different pipe coupling types available
to suit different project requirements
Advances in sediments or talus
Portal sections
Advances in frequently changing ground
conditions
Single AT - Pipe Umbrella
Double AT - Pipe UmbrellaSingle AT - Pipe Umbrella with double overlap
Re-excavation of collapsed drifts
or tunnels
Urban Tunneling
Cross section when excavating under an AT - Pipe Umbrella
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System Description
System Components
The AT - Pipe Umbrella System is installed
Using the overburden drilling method
Piecewise
With conventional drill booms
By hydraulic, rotary-percussive drilling
Cooling, flushing, and back-flow of thecutting takes place inside the casing
pipes using water.
AT - Starter Unit with Drill Bit
AT - Extension Tube
Valves in injection holes
Various AT - Adapters
Drill Rods
AT - Grouting Plug (End Plug)
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Specifications 1)
SystemSteel
grade
Modulus of
elasticity
Yield
strength
Outer
diameter
Wall
thicknessWeight
Standard
tube length
Moment of
inertia
Section
modulus
Maximum
moment
(elastic)
Type 2) [N/mm2] [N/mm2] [mm] [mm] [kg/m] [m] [cm4] [cm3] [kNm]
AT - 76
S355 210,000 355
76.1 6.3 10.8 3.0 85 22 7.9
AT - 89 88.9 6.3 12.8 3.0 140 31 11.2
AT - 114 114.3 6.3 16.8 3.0 312 54 19.4
AT - 139 139.7 8.0 26.0 3.0 720 103 36.6
AT - 168 168.0 12.5 48.0 2.0 1,860 221 78.5
1) Deviating structural properties are available on request
2) According to EN 10025-2
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Technical Features
AT - Drilling System
Quick length adjustment of the
AT - Pipe Umbrella System facilitated
by piecewise installation
Simple connection of extension tubes
even in restricted space
High drilling accuracy of pipe
umbrella drills
The drilling energy is transferred via
drill rods and an inside adapter onto
the single-use drill bit of the AT - Starter
Unit. The cooling and flushing medium is
immediately transported from the drill bit
front backward inside the umbrella pipes.
After completion of the installation, the
single-use drill bit remains at the toe of
the borehole; adapter and drill rods areremoved and re-used for consecutive
pipe installations.
Loss or blocking of a drill bit is
impossible because it is fixed
within the starter unit
A single-use drill bit ensures the same
high quality for each drilling process
Application of a single-use drill bit
provides optimum pre-conditions to
achieve the total drilling depth every
time
The drill bit type can be adapted togiven geological conditions
Stable drilling direction due to stable
drill bit orientation
Disconnecting and reconnecting of
drill rods is possible at any time
Small overcutting ensures the lowest
possible stress relaxation
Special pipe coupling types for
different static requirements
The use of the AT - Pipe Umbrella
Automation Unit increases the drilling
progress, minimizes over-excavation
(saw tooth profile), and increases
personnel safety
Application of preventers possible
Recording and control of the grouting
process using a flow-pressure meter
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AT - Pipe Couplings
Standard Thread Connection
Squeezed Connection
The AT - Pipe Umbrella System is installed
with conventional drilling machines.
Single pipes are installed piecewise at a
length that fits the drill boom length.
When using a standard thread connection, an outside and inside
thread is cut into the ends of the pipe umbrella pipes. This type of
coupling reduces the cross-section of the pipe at the area of the
thread connection. Thereby, the section modulus is decreased
as well. Besides the geometrical conditions of the thread, the
overall quality of the pipes is a major concern for the maximum
load-bearing capacity. In general, calibrated tubes reach a higher
resistance against bending than non-calibrated ones.
Simplest connection type
Installed tubes show a constant inner diameter
The stiffness of the connection is considerably lower than
the stiffness of the standard pipes The rupture load of the connections is comparable to the
design load of standard pipes; it is clearly lower for
non-calibrated tubes
Further decrease of the load-bearing capacity if mistakes
occur during screwing or grouting of the pipes
A lower load-bearing capacity can only be compensated by
a higher number of pipes
Dislocation of the coupling positions in the longitudinal
direction does not increase the load-bearing capacity
Installation can be accomplished with or without an
AT - Pipe Umbrella Automation Unit
This connection type can be recommended for the installation
of measurement instrumentations and for ground-improving
injection works.
A squeezed connection consists of a reduced pipe end which is
force-fitted with its counter piece. In the coupling area, the cross
section stays constant and the section modulus is decreased.
The ultimate load of this connection is higher than the elastic
design load of a normal pipe (> 1.5)
Transition from elastic to plastic material behavior begins at
approximately of the elastic design load (standard pipe)
Reduction of the inner diameter in the connection area
Reduction of the stiffness against bending in the connectionarea
Installation can only be accomplished with an AT - Pipe
Umbrella Automation Unit incorporating a squeezing unit
Usage of this connection type can be recommended for all
advances where a pipe umbrella is installed because of its
static load-bearing capacity.
Type and quality of the pipe coupling
are decisive factors for the maximum
achievable load-bearing capacity of the
support system.
For this reason, three different types of
couplings are available for the AT - Pipe
Umbrella System.
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AT - Pipe Couplings
Nipple Coupling
Nipple couplings are an additional steel nipple where a thread
connection is pressed and welded into both ends of the extension
tubes. This ensures that the section modulus at the coupling is
never lower than the section modulus of the standard pipe.
The elastic design load is equal to the one of a
standard pipe
Stiffness in the elastic range is comparable to the one
of a standard pipe
Reduction of the inner cross-section
Installation can be accomplished with or without an
AT - Pipe Umbrella Automation Unit
Usage of this connection type can be recommended for advances
where the static load-bearing capacity is required to achieve stabl
conditions and settlement limitations are part of the design.
00 1 2 3 4 5 6 7 8 9
20
40
60
80
100
120
140
160
180
Load[kN]
Deflection [mm]Standard Pipe
Standard Thread Connection
Squeezed Connection
Nipple Coupling
Elastic Material Behavior (analytic)
Plastic Material Behavior (analytic, bi-linear material characteristics)
200
Elastic Design
Load
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Installation Procedure
1. For drilling, the AT - Starter Unit with drill bit is assembled
together with the first AT - Extension Tube, the AT - Adapter,
and the drill rod onto the drill boom
2. Installation of the first AT - Extension Tube
3. The next drill rod with AT - Extension Tube is connected
to the previously installed pipe and the drilling process is
continued afterwards
4. The last step shall be repeated until the designed length of the
AT - Pipe Umbrella has been installed
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Main Advantages
AT - Pipe Umbrella Automation Unit
The AT - Pipe Umbrella Automation Unit
allows automated feeding, screwing, and
installation of extension tubes plus
drill rods.
Shorter manipulation times due to
exact and automated feeding
Faster construction of a pipe umbrella
support system
Higher occupational safety
No handling besides moving parts of
the drilling machine
Simple re-charging of extension tubes
via a loading basket
Remote-controlled feeding of tubes
Less manpower required
Optimum utilization of the working
space
Smaller saw-tooth shaped profile and
thereby less excavation volume
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Assembly groups
Specifications
Screwing unit and centering/clamping device
Loading device and pipe feeding system
Electric switch case
Central guiding device
Remote control
Hydraulic control box Pipe deposition
Characteristics / Assembly groupDimensions
(L x B x H) [mm]Weight [kg]
Pipe deposition 1,040 x 230 x 350 28
Screwing unit and centering / clamping device 1,165 x 360 x 745 160
Loading device and pipe feeding system 3,485 x 350 x 565 160
Central guiding device 155 x 190 x 220 12
Hydraulic control box 550 x 275 x 345 60
Electric switch case 380 x 600 x 350 35
Remote control 250 x 140 x 180 2.3
Characteristics Unit Value Remark
Total weight (gross) [kg] 460 - 490Deviations possible,
depending on the type
Electric supply [V] 24 DC
Hydraulic supply [L/min] 20 At approx. 170 [bar]
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Assembly groups
Screwing unit and centering/clamping device Hydraulic rock drill
Central guiding
device
AT - Starter Unit wi th dril l bit
Foundation ground
Pipe deposition with AT - Extension Tub
and drill rod
Drill boom
Hydraulic control box
Loading device and pipe feeding system with AT - Extension Tube an
drill rod
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Accessories
Further References
Flow-Pressure meter
Injection packer
Volkmann, G.M. & W. Schubert 2007.
Geotechnical Model for Pipe Roof
Supports in Tunneling. In Proc. of
the 33rdITA-AITES World Tunneling
Congress, Underground Space -
the 4thDimension of Metropolises,
Volume 1. eds. J. Bartak, I.Hrdina,G.Romancov, J. Zlamal, Prague,
Czech Republic, 5-10 May 2007,
Taylor & Francis Group, ISDN:
978-0- 415-40802. app. 755-760
Volkmann G.M. & Schubert W. 2008.
Tender Document Specifications for
Pipe Umbrella Installation Methods.
In proceedings of the 34thITA-AITES
World Tunneling Congress, Agra, India,
22-24 September 2008, pp. 285-293
AT - Pipe Umbrella Geometry
Calculator
Installation Manual for the
AT - Pipe Umbrella System
Mortar-Mixing pump
DYWIInject Systems
Fishing tab
Drill rod wrench
Chain pipe wrench
Rock drilling equipment: shank adapter,
coupling, and coupling adapter
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0 4 1 9 7 1 / 0 4 1 3 w e b h e
EMEADYWIDAG-Systems International GmbHAlfred-Wagner-Strasse 14061 Pasching/Linz, AustriaPhone +43-7229-610 49 0Fax +43-7229-610 49 80E-mail [email protected]
North AmericaDSI Underground Systems Inc.9786 S Prosperity Road
West Jordan, UT 84081, USAPhone +1-801-973 7169Fax +1-801-973 7172E-mail [email protected]
South AmericaDSI Chile Industrial Ltda.Las Encinas #1387, Valle GrandeLampa, Santiago de Chile, ChilePhone +56-2-596 96 20Fax +56-2-596 96 69E-mail [email protected]
APAC/ASEANDYWIDAG-Systems International Pty. Ltd.25 Pacific HighwayBennetts Green, NSW 2290, AustraliaPhone +61-2-49 48 90 99Fax +61-2-49 48 99 56E-mail [email protected]/au
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Please note:This brochure serves basic informationpurposes only. Technical data and informationprovided herein shall be considerednon-binding and may be subject to changewithout notice. We do not assume any liabilityfor losses or damages attributed to the useof this technical data and any improperuse of our products. Should you requirefurther information on particular products,please do not hesitate to contact us.
ALWAG(AM 952/79), AT(AM 6138/2003),AT-SYSTEM (AM 6139/2003),DYWI(4197869), LSC(AM 4326/2008),OMEGA-BOLT(3258282),POWER SET(AM 6163/2002), andTUBESPILE(AM 4328/2008) are registeredtrademarks of DYWIDAG-Systems International GmbH.Combi Coatand CT-Boltare trademarksof Vik rsta AS.DYWIDAG-Systems International GmbHis a partner of Vik rsta AS.