mp30 user guide

5/20/2018 MP30 User Guide

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User Guide

MP30 Mechanical Strut - Issue 1 - April 2013

MP30 Mechanical Strut

Important Notes

All excavation work must be thoroughly planned before work commences onsite and a comprehensive site specific risk assessment completed

These instructions form guidance for MP30 Mechanical strutting equipmentwhen used to support excavations. Non-standard applications of this

equipment must be approved by a Groundforce engineer.

Ensure all personnel engaged in installation operations are adequatelytrained, properly briefed and supervised by a competent person.

All hires for this equipment will generally be accompanied by anarrangement or scheme specific drawing. This must be read in conjunction

with these instructions

IF IN ANY DOUBT SEEK FURTHER ADVICE:

ON FREEPHONE - 0800 000 345


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User Guide


Introduction

The MP30 is a medium duty modular format mechanically operated strutting system for spanning between walingbeams. The strut comprises short stroke push / pull type screw units in conjunction with standard MK2 solider

components as shown schematically below. The strut can resist axial loads up to 30 tonnes (working load) atshort spans after which the load capacity reduces due to potential buckling of the soldier. Soldiers can be twinnedup and braced together using a multi-way adapter which will allow increased load capacity at longer spans(refer to technical data). The strut assembly is shown schematically in the diagrams below; note as theadjustment range of a single screw unit is only 150mm, therefore screw units are recommended at each end togive more range adjustment on site.

Connections Details

BoltRef.

No. required Specification ToolsTightening

Torque

B1 4 No. per flangeM16 x 35 HT Bolted

connectionSpanner / socket 160Nm (120ft lb)

B2 1 No. swivel pinM30 x 100 grade 10.9bolts, Nyloc nut c/w

2No. washers

Spanner / socket Spanner tight only

B3 2 No. per flangeM16 x 35 HT Bolted

connectionSpanner / socket 160Nm (120ft lb)

Note: Ensure all bolts are fully tightened before & after installation.

B1

B2

B1

B1

B1

B2

B3

B3

Component Identification

Description Weight

End Cleat 1.5kg

End Bearing Plate 15kg

Swivel Pin(M30x100 Gr 10.9 bolt )

0.25kg

Bolted Flange Swivel Plate 12kg

Screw Jack 24kg

MK2 Soldier Extension 20.8kg/m

Multi-way Adapter 20kg

Inset - Multi-wayadaptor


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User Guide


Notes on Handling, Lifting & Installation

Prepare a detailed lifting plan

Ensure adequate capacity of lifting equipment

Know the weight of the load

Adjust slings so that loads are balanced correctly

Check lift angle of chains is not exceeded

Do not exceed the capacity of individual liftingpoints

Use a qualified banksman

Be aware of personnel in the vicinity

Use tag lines to control load

Ensure all lifting equipment has valid certification

Do not use damaged lifting points

Report damaged lifting points and equipment

Note. MP30 struts are relatively lightweight and are therefore are not fitted with specific lifting points. It istherefore necessary to sling the struts through holes in the soldiers. The lifting positions must be chosen so thatthe strut is slung horizontally.

All slings, shackles and any other lifting equipment must have current test certificates and working load limitvalues marked on them.

Installation Guide

Adjust the chain positioning to ensure that the strut islifted horizontally. Do not sling around the screw

jacks

STEP 5.Lift the strut into the excavation and positionone end of the strut against the waling beam so thatthe angle cleat hooks over the flange. With the strutstill slung by chains, adjust the screws evenly tolengthen the strut so that the angle cleats at theremote end engages over the beam flange and theend bearing platecontacts the beam.

STEP 6.Further extend the strut length by rotatingthe screw adjustment bars evenly so that positive

contactis made between beam and strut. Tighten bystriking the knocking bars with moderate force only

STEP 7.Secure the strut in position at bothendsusing the restraining chains supplied, wrapped aroundthe bearing plate as shown on the next page

STEP 9.Fit the lower cleats to the bearing plates ifrequired.

STEP 10.The lifting chains can now be removed.

GENERAL:

STEP 1. Ensure that the lifting appliance is ofadequate capacity (see component weights &operating range chart). The components should beoff-loaded and stacked, preferably on a clean flatarea.

STEP 2.It is recommended that the bearing areas onthe waling beam be carefully selected, referring to thedesign drawings as necessary to avoid protrusions,e.g. bolts, bushes, etc; that would interfere with theseating of the strut, then cleaned and marked prior toinstalling the strut.

IMPORTANT NOTE:

Ensure that the cleat positioning allows the centreline of the strut to be linedup to within +/- 50mm of the centreline of the waling beam.

INSTALLATION:

STEP 1.The strut will arrive on site pre-assembled in

its correct configuration However if adjustment ofcomponents is required this should be carried outoutside the excavation prior to lowering into place.

STEP 2. Check that all bolts connecting thecomponents are in place and tight. Do not attemptlifting the assembled strut until this is done.

STEP 3. Adjust the screws equally at each end sothat the overall length of the strut is set at 50mm lessthan the required dimension between bearing faces.

STEP 4.If the strut us to span between steel walingbeams attach the top angle support cleatsto the endbearing plates using the three bolts supplied. Fullytighten.

Note: No specific lifting chain attachment points areincluded on MP30 struts. Slinging is achieved bypassing the chain legs through the diamond shapedholes in the soldier and looping the hook back overthe chain.


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Do Do Not

Dos and Donts

Laterally load the strut from the side

Use bolts other than those supplied by Groundforce

for all flange connections

Allow debris to accumulate on the strut

Contaminate the external screw thread with concrete

etc.

Use uncertified lifting equipment

Attempt to remove the strut under load

Suspend or store materials on the struts

Sling around the threaded portion of the screws.

Prepare a detailed site specific method statement inplace before installation and removal commences.

Ensure the strut is adequately located onto the

bearing surface and always use a designed andapproved connection to support both ends of eachstrut

Inspect struts regularly and check overall strutalignment after installation

Adequately support strut sub-assemblies during

installation / removal

Ensure all flange joint bolts are in place and are tightbefore use.

Take care to protect the strut from accidental strikes,concrete accumulation, etc

Ensure the screws are well protected with greasetape or similar after installation

Removal Guide

REMOVAL:

STEP 1. Upon completion of the permanent works,ensure the excavation is backfilled to the underside ofthe strut and the surround material is fullycompacted.

STEP 2. Make provision for adequate supportbelow the strut before attempting removal (i.e.attach the lifting chains).

STEP 3.Release the load in the jack by loosening thescrew retaining nut. It may be necessary to carefully

hit the strike points with a lump hammer untilmanual removal is possible.(DO NOT USE EXCESSIVE FORCE).

STEP 4. Remove the lower angle cleat only (iffitted).

STEP 5.Remove the Hanging/Interlink chains whenthe strut is secured to the Lifting chains.

STEP 6. take the weight of the strut and unscrew oneend sufficiently to release the strut to enable it to belifted clear of the excavation. Warning: the strut mayswing once the load is released.

Note: The strut can resist substantial axial loads inuse and no attempt must be made to remove it duringexcavation work or prior to backfilling.

Restraining Chains

IMPORTANT NOTE:

THE RESTRAINING CHAINS PROVIDED MUST BEUSED AT BOTH ENDS OF THE STRUT. THEY SERVE ASA SECONDARY MEASURE IN CASE OF ACCIDENTAL

DISLODGEMENT.

Connection must be made by securing to theadjacent beam or other suitable point. Struts must besecurely supported by means other than the restrain-

ing chains before installation or during removal.

WARNING!

UNDER NO CIRCUMSTANCESMUST RESTRAINING CHAINS BEUSED FOR LIFTING OPERATIONS

Refer also to Restraining Chain Instructions.


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User Guide


Ranges (standard configurations)

The MP30 mechanical strutting system uses short stroke, push / pull type screw units in conjunction with

standard Mk2 solider components as shown schematically in the diagrams below. Axial loads up to 30 tonnes canbe accommodated although at longer spans the load capacity reduces due to potential buckling of the soldier. Atwin soldier heavy duty version is available to accommodate increased load at longer spans. Three differentconfigurations of the MP30 are available:

1. Single screw / single soldier assembly for short spans typically up to 2.0m2. Twin screw / single soldier assemblies (illustrated above) for spans up to 5.8m3. Twin screw / twin soldier assemblies for heavy duty use up to 8.0m maximum span

Available Soldier Lengths: 150mm (7.2kg), 450mm (11.7kg), 900mm (21.4kg), 1800mm (37.4kg), 2700mm(54.2kg) & 3600mm (71.0kg)

Configuration 1 (Single Screw / Single Soldier)

Minimum Range = 650 - 800mm (no Soldiers included)Maximum Range = 2.0m

Configuration 2 (Twin Screw / Single Soldier)

Minimum Range = 1000 - 1300mm (no Soldiers included)Maximum Range = 5.8m

Configuration 3 (Twin Screw / Twin Soldier)

Minimum Range = 1930 - 2230mm (includes 450mm Soldiers)Maximum Range = 8.0m

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