4 - bracing strut systems - issue 3 tech file - mgf.ltd.uk · bracing strut systems ... prior to...

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MGF 200 Series Strut 4.1





BRACING STRUT SYSTEMSSECTION 4

MGF Bracing Strut System at the Chiltern Project for CJ O’Shea in London

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4.1.1Issue 3

4 1 1

DescriptionHighly versatile, simple to assemble, medium duty, modular bracing strut system designed primarily to be used as intermediate struts with MGF hydraulic bracing systems. The system can also be used in any plane to prop steel, concrete or masonry structures. Each strut comprises either hydraulic ram or mechanical jack assemblies together with various length strut extension bars. The system can support loads of up to 600kN and span from 0.625m to approx 12.0m. Components are heavy and are normally assembled on site prior to being lifted into place and installed within the excavation using either large excavators or cranes. A variety of end bearings are available allowing the struts to be used at a wide range of angles and within any plane.

Fabricated from grade S355 200x200 steel box section the extensions are quickly assembled into the required

either a double acting hydraulic ram or a mechanical (screw thread adjusted) jack providing up to 745mm of stroke. Once located at the correct line and level the struts are pre-loaded (or tightened) against the faces to be supported using a hydraulic pump on the ram (or by striking the locking collar of the mechanical jack). Pre-loading of the legs ensures the strut cannot slip, takes up any slack or hogging in the system and minimises the extent of potential ground movements. Handling points are provided at regular intervals on each leg to assist

MGF can supply the systems with a full range of suitable handling chains, hydraulic pump installation kits

Manufactured and designed in accordance with BS EN 14653:2005 PARTS 1 and 2 Manually operated Shoring Systems for Groundwork Support and BS 5975 (2008) Code of Practice for Temporary Works Procedures and the Permissible Stress Design of Falsework.

Product Notes1. Strut systems are heavy and should only be assembled, installed and removed by competent persons in

2. Installation is normally carried out by assembling the complete strut and then lowering into place (subject

On the ram assembly max pre-load pressure of 100Bar (1500psi) must not be exceeded unless design states otherwise.

3. Additional restraining chains or support brackets are normally provided to the brace at intermediate strut locations to carry the additional strut weight.

4. closed prior to releasing strut from lifting chains and commencing works. When assembling on site ensure

Any gaps in bearing plates must be securely packed by using

hydraulic rams.5. Individual components should be visually inspected for

loose locking collars prior to entering the excavation.6.

barrier protection (for plant) should always be considered.7. Prior to removal of systems the complete weight of the

strut must be independently supported. Once this is accomplished the hydraulic rams (or struts) must be released and retracted to avoid the need for excessive extraction forces.

8. When installing struts at angles great care must be taken to ensure that the angles match the design, all shear stops are in place

of transmitting loads effectively.9. Extreme care must be taken when handling the mechanical

jack as the screw thread is free to move within the outer and can accidently retract or extend. It is therefore recommended that during handling operations the jack is fully extended and the locking collar closed against the outer to prevent any sudden movements.

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4.1.2Issue 3

MGF Pole Ladder

MGF Davitsafe - See Section 6

MGF 203 UC/ 254 UC Series - See Section 3

MGF Laddersafe - See Section 6

MGF Edgesafe - See Section 6

MGF Trench Sheets - See Section 5

MGF 200 Series

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4.1.3Issue 3

Handling PointWLL = 7.0t

Strut assemblies are lifted and handled by attaching MGF lifting

points as shown.

Strut Flange Connection Detail200 Series Struts and Extensions

(300x300x20mm) using 8 No. grade

(recommended min. torque 300Nm).

Top Swivel Bearing Detail The swivel is secured to the UC section by bolting RSA sections to the swivel base plate using 12

and washers.

Base Swivel Bearing Detail The swivel can be secured

bolts.

Vertical Shear Restraint Detail The vertical restraint detail should be used whenever there is a raking prop. It can either be welded to the pan of

sheets or bolted to a concrete wall using anchors.

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4.1.4Issue 3

Cleat End Bearing Detail The end cleat is bolted to the strut or extension using 4 No. grade 8.8 M20 countersunk bolts

UC section. When using this end detail MGF recommend that restraining chains are used to lash the waler and strut together at each end to prevent

the strut being dislodged if struck accidently.

Knee Brace End Bearing Detail

The swivel is secured to the UC section by bolting RSA sections to the swivel base plate using 12 No.

washers.

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4.1.5Issue 3

540kN Mechanical Strut

Axial load only

Axial + 10kN accidental load

600kN Hydraulic Strut

Axial load only


Safe Working Load for MGF 200 Series (kN)



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4.1.6Issue 3

Product Description Product ID

Face to Face Dimension (mm) Weight (kg)Min. Max.

250kN Hydraulic Strut 9.400 625 925 105540kN Mechanical Strut 9.015 1085 1830 147600kN Hydraulic Strut 9.016 1150 1750 375

Product Description Product ID Weight (kg)200 Series 0.25m Extension 9.206 40200 Series 0.5m Extension 9.205 52200 Series 1.0m Extension 9.210 76200 Series 1.5m Extension 9.215 101200 Series 2.0m Extension 9.220 124200 Series 3.0m Extension 9.230 173200 Series 4.0m Extension 9.240 223200 Series 5.0m Extension 9.250 268200 Series 6.0m Extension 9.260 316

540kN mechanical strut assembly comprises inner screw threaded sections and outer sleeved steel sections combined with a threaded collar to provide up to 745mm of leg adjustment.

250kN and 600kN hydraulic strut assemblies comprise of inner and outer sleeved steel box sections housing a double acting (DA) hydraulic ram to provide up to 600mm of leg adjustment.

200 Series extension bars range in length from 0.25m to 6.0m and are connected to each other via 8 No. grade 8.8 M20 bolts

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4.1.7Issue 3

Extension Bar200x200x8 SHS

Material Grade S355Unit Mass 47.7kg/mAxial SWL 600kN

Moment SWL 100kNmJoint Moment SWL 100kNm

Hydraulic Ram Inner Section Outer Section200x200x12.5 SHS

(+ 4 No. 90x10mm thk. stiffening plates)

250x250x12.5 SHS

Material Grade S355 S355Unit Mass 95.8kg/m 91.9kg/mAxial SWL 600kN 600kN

Moment SWL 100kNm 100kNm

Mechanical Jack Inner Section Outer Section

100x12.5 thk. CHS 120x120x8 SHS

Material Grade ST52 S355Screw Thread Detail

Unit Mass 27.0kg/m 50.8kg/mAxial SWL 540kN 540kN


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4.1.8Issue 3

Hydraulic Ram Inner Section Outer Section140x140x8 SHS 160x160x8 SHS



MGF’s new 250kN Hydraulic Strut has been designed for use with 203 UC Series and 254 UC Series Brace as well as MGF’s new 152 UC Waler. It is suitable for narrow trenches and is compatible with 200 Series extensions and adaptors.

When used with the 152 UC Waler the 250kN hydraulic struts must be clamped in position. The 250kN strut can also be used as Endsafe when used in the outermost position.

When used with 203 UC or 254 UC Series Brace the 250kN hydraulic strut can either bear directly onto the UC using end cleats or clamping plates (4.1.11) as above, or connect

using these Strut Adaptors the 200 Series can also be used as an End Protection Strut.

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4.1.9Issue 3

Pump Units

Product ID 1.603 (DA)Capacity 20 litres

Shoring Fluid Houghto Safe SF25Installation Pressure 0-1500 psi

The pump is used to extend and retract the 250kN and 600kN double acting hydraulic rams. The pumps contain bio-degradable Houghto Safe SF25 shoring

water at a ratio of 3 parts water to 1 part Houghto Safe SF25. In the Winter the mix ratio is 1:1.Maximum recommended installation pressure 1500 psi (100 Bar).

bore side of the piston through the male quick release valve (QRV) to extend the ram.

return side of the piston is returned to the pump via the female QRV. Retraction is a reverse of extension.Ensure isolation valve is closed to maintain pre-load pressure

QRV’s.

Hydraulic CylinderMaterial Steel Steel

Bore 85mm 140mmMax .Working Pressure 440 Bar (6400 psi) 390 Bar (5700 psi)

Test Pressure 440 Bar (6400 psi) 390 Bar (5700 psi)Approx. Working Stroke 300mm 600mm

Axial SWL 250kN 600kN2 2

Working Temp Range -20ºC* to +50ºC -20ºC* to +50ºCApprox. Pre-Load 65kN 150kN

Locating Pins 22 22 and 26mm

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4.1.10Issue 3

200 Series Swivel Type A Type BProduct ID 9.301 9.209 & 9.2095

Weight 75kg 32kgRaking Prop Operating

Range 22°- 40° 65°- 90°

Knee Brace/Cross Strut Operating Range 22°- 65° 65°- 90°

Axial SWL 600kN 600kNSwivel Base Plate 385 x 420 x 30mm thk. (S355) 300 x 300 x 20mm thk. (S275)

Base Plate Hole Details 20 No. 22 holes 8 No. 22 holesPin Detail 62 (080M40/EN8) 50 (708M40/EN19A)

‘Type A’ swivels can be connected directly to concrete structures or the

‘Type B’ swivels can be connected to both the 203 UC and 254 UC Brace Systems by using the 200 Series Clamping Plate as detailed on page 4.1.11.

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4.1.11Issue 3

200 Series Ancillaries

200 Series End Seating Plate

200 Series Clamping Plate

200/300 Series Vertical Restraint

Product ID 9.314Weight 45kgMaterial

Bolting Details

4 No. grade 8.8 M20

and 8 No. grade 8.8

and washersBearing SWL 600kN


Weld Details weld Shear SWL 600kN


Bolting Details

4 No. grade 8.8 M20 countersunk

washersBearing SWL 600kN

200 Series 152 UC Waler Clamp

Product ID 9.317Weight 3kgMaterial S275

Bolting Details


washers

When connecting 200 Series to 152 UC, 2 No. of the above clamps should be attached to each end of the strut.

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4.1.12Issue 3

Sheet to Sheet

Dimension (m)

540kN Mechanical 600kN Hydraulic

Min. Length (mm)

Max. Length (mm)

Leg Weight (kg)

Min. Length (mm)

Max. Length (mm)

Leg Weight (kg)

1.5 1118 1863 197 1190 1790 4052.5 2118 2863 273 2190 2790 4813.5 3118 3863 321 3190 3790 5294.5 4118 4863 370 4190 4790 5785.5 5118 5863 420 5190 5790 6286.5 6118 6863 465 6190 6790 6737.5 7118 7863 541 7190 7790 7498.5 8118 8863 593 8190 8790 8019.5 9118 9863 667 9190 9790 875

10.5 10118 10863 717 10190 10790 92511.5 11118 11863 736 11190 11790 944

N.B Single 0.25 or 0.5m extensions should be added to these combinations for intermediate dimensions. The strut assemblies are shown at mid-stroke, so each length can vary by up to 372mm in either direction. The 250kN Hydraulic Strut can be used in lieu of the 600kN Hydraulic.

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4.1.13Issue 3

Typical Raking Prop Application

Typical bearing detail on RC capping beam.

Typical bearing detail on concrete thrust

block.

MGF 200 Series Struts

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4.2.1Issue 3

DescriptionHighly versatile, simple to assemble, medium duty, modular bracing strut system designed primarily to be used as intermediate struts with MGF hydraulic bracing systems. The system can also be used in any plane to prop steel, concrete or masonry structures. Each strut comprises either hydraulic ram or mechanical jack assemblies together with various length strut extension bars. The system can support loads of up to 600kN and span from 1.1m to approx 18.0m and can incorporate a central cruciform bar offering intermediate vertical support to perpendicular struts. Components are heavy and are normally assembled on site prior to being lifted into place and installed within the excavation using either large excavators or cranes. A variety of end bearings are available allowing the struts to be used at a wide range of angles and within any plane.





Product Notes1. Strut systems are heavy and should only be assembled, installed and removed by competent persons in




4. closed prior to releasing strut from lifting chains and commencing works. When assembling on site ensure

Any gaps in bearing plates must be securely packed by using hardwood

5. Individual components should be visually inspected for damage,

to entering the excavation.6.

barrier protection (for plant) should always be considered.7. Prior to removal of systems the complete weight of the

strut must be independently supported. Once this is accomplished the hydraulic rams (or struts) must be released and retracted to avoid the need for excessive extraction forces.

8. When installing struts at angles great care must be taken to ensure that the angles match the design, all shear stops

capable of transmitting loads effectively.9. Extreme care must be taken when handling the mechanical

jack as the screw thread is free to move within the outer and can accidently retract or extend. It is therefore recommended that during handling operations the jack is fully extended and the locking collar closed against the outer to prevent any sudden movements.

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4.2.2Issue 3

MGF Pole Ladder


MGF 203UC/ 254 UC Series - See Section 3




MGF 300 Series

Cruciform strut option

using 254 UC 200/300 Series Strut Adaptors Note: 300 Series Cruciforms should

greater than 12.0m

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4.2.3Issue 3



points as shown.

Top Swivel Bearing Detail The swivel is secured to the UC section by bolting RSA sections to the swivel base plate using 12

and washers.


bolts.



Strut Flange Connection Detail300 Series Strut assemblies and swivel plates are connected to 300 Series Extensions using a transition plate (400x400x20mm), 8 No. grade 8.8 M20


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4.2.4Issue 3

Cleat End Bearing Detail The end cleat is bolted to the strut or extension

washers. The cleat then sits on the UC section. When using this end detail MGF recommend that restraining chains are used to lash the waler and

strut together at each end to prevent the strut being dislodged if struck accidently.


The swivel is secured to the UC section by bolting RSA sections to the swivel base plate using 12 No.

washers.

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4.2.5Issue 3

540kN Mechanical Strut

Axial load only





300

350

400

450

500

550

600

650

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Max

imum

SW

L (k

N)

Strut Span (m)

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4.2.6Issue 3



540kN Mechanical Strut 9.015 1085 1830 147kg600kN Hydraulic Strut 9.016 1150 1750 375kg

Product Description Product ID Weight (kg)300 Series 0.5m Extension 9.000 107300 Series 1.0m Extension 9.001 163300 Series 2.0m Extension 9.002 280300 Series 3.0m Extension 9.003 388300 Series 5.0m Extension 9.005 610

540kN mechanical strut assembly

comprises inner screw threaded sections and

outer sleeved steel sections combined

with a threaded collar to provide up

to 745mm of leg adjustment.

600kN hydraulic strut assembly comprises

inner and outer sleeved steel box sections

housing a double acting (DA) hydraulic ram to

provide up to 600mm of leg adjustment.

300 Series extension bars range in length

from 0.5m to 5.0m and are connected to each other via 8 No. grade

and washers.

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4.2.7Issue 3

Extension Bar300x300x12.5 SHS



Hydraulic Ram Inner Section Outer Section200x200x12.5 SHS

(+ 4 No. 90x10mm thk. stiffening plates)

250x250x12.5 SHS




100x12.5 thk. CHS 120x120x8 SHS

Material Grade ST52 S355Screw Thread Detail

Unit Mass 27.0kg/m 50.8kg/mAxial SWL 540kN 540kN


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4.2.8Issue 3

Pump Units

Hydraulic CylinderMaterial Steel

Bore 140mmMax .Working Pressure 390 Bar (5700 psi)

Test Pressure 390 Bar (5700 psi)Approx. Working Stroke 600mm

Axial SWL 600kN2

Working Temp Range -20ºC* to +50ºCApprox. Pre-Load 150kN

Locating Pins 22 and 26mm

Product ID 1.603 (DA)Capacity 20 litres

Shoring Fluid Houghto Safe SF25Installation Pressure 0-1500 psi

The pump is used to extend and retract the 600kN double acting hydraulic rams. The pumps contain bio-degradable Houghto Safe SF25 shoring

water at a ratio of 3 parts water to 1 part Houghto Safe SF25. In the Winter the mix ratio is 1:1.Maximum recommended installation pressure 1500 psi (100 Bar).

bore side of the piston through the male quick release valve (QRV) to extend the ram.

side of the piston is returned to the pump via the female QRV. Retraction is a reverse of extension.Ensure isolation valve is closed to maintain pre-load pressure and

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4.2.9Issue 3

200 Series Swivel Type A Type BProduct ID 9.301 9.209 & 9.2095


Range 22°- 40° 0°- 28°



Base Plate Hole Details 20 No. 22 holes 8 No. 22 holesPin Detail 62 (080M40/EN8) 50 (708M40/EN19A)

Systems by bolting on the associated clamp assemblies.

‘Type B’ swivels can be connected to both the 203 UC and 254 UC Brace Systems by using the 200 Series Clamping Plate as detailed on page 4.2.10.

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4.2.10Issue 3


200/300 Series End Seating Plate

200 Series Clamping Plate

200/300 Series Vertical Restraint


Bolting Details

4 No. grade 8.8 M20

and 8 No. grade 8.8

and washersBearing SWL 600kN




Bolting Details

4 No. grade 8.8 M20

washers

Bearing SWL 600kN

300 Series Cruciform


Bolting Details c/w nuts and washersStrut Adaptor SWL 600kN

Axial SWL 600kNMoment SWL 308kNm

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4.2.11Issue 3

Sheet to Sheet

Dimension (m)

540kN Mechanical 600kN Hydraulic

Min. Length (mm)

Max. Length (mm)

Leg Weight (kg)

Min. Length (mm)

Max. Length (mm)

Leg Weight (kg)

6.5 6138 6883 852 6210 6810 10277.5 7138 7883 1015 7210 7810 11908.5 8138 8883 1132 8210 8810 13079.5 9138 9883 1240 9210 9810 1415

10.5 10138 10883 1412 10210 10810 158711.5 11138 11883 1520 11210 11810 169512.5 12138 12883 1625 12210 12810 180013.5 13138 13883 1742 13210 13810 191714.5 14138 14883 1850 14210 14810 202515.5 15138 15883 2022 15210 15810 219716.5 16138 16883 2072 16210 16810 224717.5 17138 17883 2235 17210 17810 2410

N.B Single 0.5m extensions should be added to these combinations for intermediate dimensions. The strut assemblies are shown at mid-stroke, so each length can vary by up to 372mm in either direction.

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4.2.12Issue 3

Typical Raking Prop Application

Typical bearing detail on RC capping beam.

Typical bearing detail on concrete thrust

block.

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4.3.1Issue 3

DescriptionHighly versatile, simple to assemble, heavy duty, modular bracing strut system designed primarily to be used as intermediate struts with MGF hydraulic bracing systems. The system can also be used in any plane to prop steel, concrete or masonry structures. Each strut comprises either hydraulic ram or mechanical jack assemblies together with various length strut extension bars. The system can support loads of up to 2500kN and span from 1.6m to approx 24.0m and can incorporate a central cruciform bar offering intermediate vertical support to perpendicular struts. Components are heavy and are normally assembled on site prior to being lifted into place and installed within the excavation using either large excavators or cranes. A variety of end bearings are available allowing the struts to be used at a wide range of angles and within any plane.





Product Notes1. Strut systems are very heavy and should only be assembled, installed and removed by competent persons




4. hydraulic ram isolation valves are closed prior to releasing strut from lifting chains and commencing works. When assembling on site ensure that all

threads visible beyond the nut. Any gaps in bearing plates must be securely packed by using hardwood wedges or

5. Individual components should be visually inspected

pressure or loose locking collars prior to entering the excavation.

6. and barrier protection (for plant) should always be considered.

7. Prior to removal of systems the complete weight of the strut must be independently supported. Once this is accomplished the hydraulic rams (or struts) must be released and retracted to avoid the need for excessive extraction forces.

8. When installing struts at angles great care must be taken to ensure that the

packed and capable of transmitting loads effectively.9. Extreme care must be taken when handling the mechanical jack as the screw thread can

detach from the outer if fully wound out.

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4.3.2Issue 3

MGF Pole Ladder


MGF 406 UC Series - See Section 3




MGF 400 Series

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4.3.3Issue 3



points as shown.

Strut Flange Connection Detail400 Series Struts and Extensions are connected

washers (recommended min. torque 400Nm).

Top Swivel Bearing Detail The swivel hooks over the

and when the strut is pre-loaded the birds mouth detail bears onto


bolts.



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4.3.4Issue 3

Cleat End Bearing Detail The end cleat is bolted to the strut or extension using 9 No. grade 8.8 M24 countersunk bolts

UC section. When using this end detail MGF recommend that restraining chains are used to lash the waler and strut together at each end to prevent

the strut being dislodged if struck accidently.


The swivel is secured to the UC section using 2 No. swivel clamps as detailed on page 4.3.13 using 8 No. grade 8.8 M30

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4.3.5Issue 3

1250kN Mechanical/Hydraulic Strut

Axial load only2500kN Hydraulic Strut

Axial load only



1700

1800

1900

2000

2100

2200

2300

2400

2500

2600ax

imum

SW

L (k

N)

1000

1100

1200

1300

1400

1500

1600

1700

1800

1900

2000

2100

2200

2300

2400

2500

2600

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

Max

imum

SW

L (k

N)

Strut Span (m)

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4.3.6Issue 3



1250kN Mechanical Strut 9.701 795 1170 3261250kN Hydraulic Strut 8.400 1476 2276 10472500kN Hydraulic Strut 8.500 1685 2485 1716

1250kN and 2500kN hydraulic strut assembly comprises inner and outer sleeved steel box sections housing a double acting (DA) hydraulic ram to provide up to 800mm of leg adjustment.

400 Series extension bars range in length from 0.25m to 10.0m and are connected to each other via 12 No. grade 8.8 M24 bolts

Product Description Product ID Weight (kg)400 Series 0.25m Extension 9.706 165400 Series 0.5m Extension 9.705 214400 Series 1.0m Extension 9.710 310400 Series 2.0m Extension 9.720 505400 Series 3.0m Extension 9.730 697400 Series 4.0m Extension 9.740 889400 Series 5.0m Extension 9.750 1083400 Series 6.0m Extension 9.760 1275400 Series 7.0m Extension 9.770 1465400 Series 8.0m Extension 9.780 1849

400 Series 10.0m Extension 9.799 2048

1250kN mechanical strut assembly comprises inner threaded rod and outer threaded tube providing up to 400mm of leg adjustment.

Handling Point WLL = 8t

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4.3.7Issue 3

Extension Bar400x400x16 SHS




127x25.4 thk. CHS152.4x19.1 thk. CHS

plates)Material Grade ST52 S355

Screw Thread Detail 5” ACMEUnit Mass 63.6kg/m 105kgAxial SWL 1250kN 1250kN


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4.3.8Issue 3

Hydraulic Ram Inner Section Outer Section350x350x16 SHS

(+ 8 No. 100x6 thk. stiffening plates)

400x400x16 SHS

Material Grade S355 S355Unit Mass 166kg/m 191kg/mAxial SWL 1250kN 1250kN





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4.3.9Issue 3


Bore 200mm 250mmMax. Working Pressure 400 Bar (5800 psi) 500 Bar (7250 psi)



Working Temp Range -50ºC to +50ºC -50ºC to +50ºCApprox. Pre-Load 300kN 500kN

Locating Pins 30 30

full bore side of the piston through the male quick release valve (QRV) to extend the ram.

the return side of the piston is returned to the pump via the female QRV. Retraction is a reverse of extension.Ensure isolation valve is closed to maintain pre-load pressure

QRV’s.

Motorised Pump Units

Electric Pump Diesel PumpRating 8kW

Product ID 8.4001 / 8.4003 8.4006Capacity 120 / 190 litres 100 litres

Shoring Fluid Houghto Safe SF25 Houghto Safe SF25Installation Pressure 0-1500 psi 0-1500 psi

The motorised pumps are used to extend and retract the 400 Series double acting hydraulic rams. The pumps contain neat bio-degradable Houghto

Maximum recommended installation pressure 1500 psi (100 Bar).MGF supply 2 different types of motorised pump, electric and diesel.

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4.3.10Issue 3

400 Series Swivel Type A Type BProduct ID 9.704 9.315


Range 22°- 40° 0°- 28°



Base Plate Hole Details 14 No. 32 holes 16 No. 32 holesPin Detail 90 (817M40/EN24T) 90 (817M40/EN24T)

These swivels can be connected directly to concrete structures or the 406 UC Brace Systems by bolting on the associated clamp assemblies detailed on page 4.3.13.

Type B Swivel base plate also available as 700 x 600 x 40 (product ID 9.310) - this type is not suitable

beams.

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4.3.11Issue 3

Type A swivels can be connected directly to the 406 UC Brace Systems.

Birdsmouth Type A Type BProduct ID 9.312 9.3125


Range 22°- 40° 22°- 40°

Axial SWL 2500kN 2500kNBearing Plate 20mm thk. (S355) 20mm thk. (S355)

Bearing Plate Hole Details 8 No. 26 holes 2 No. 26 holesPin Detail 90 (817M40/EN24T) 90 (817M40/EN24T)

Type B swivels can bear directly onto the corners of concrete structures such as pile caps or capping beams.

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4.3.12Issue 3


400 Series End Seating Plate

400 Series Vertical Restraint




Bolting Details


washersBearing SWL 2500kN

400 Series Cruciform


Bolting Details c/w nuts and washersStrut Adaptor SWL 1250kN

Axial SWL 1250kNMoment SWL 703kNm

Max. Span 16m

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4.3.13Issue 3

2500kN Swivel Clamping Plates Type A

Swivel Clamp Type A is to be used on 2500kN Swivel Type A, when used on a knee brace connected to

Swivel Clamp Type B is to be used on 2500kN Swivel Type B, when used as a cross strut connected

Desc. Swivel Clamp Type A Swivel Clamp Type B Modular Swivel Cleat

Product ID 8.303 (305 UC)8.40016 (406 UC)

8.304 (305 UC)8.40017 (406 UC) 9.809

Weight 34kg (305 UC)46kg (406 UC)

45kg (305 UC)54kg (406 UC) 53kg

Material30mm & 25mm thk. (305

UC) or 40mm thk. (406 UC) 30mm & 25mm thk. (305

UC) or 40mm thk. (406 UC)

Bolting Details c/w nuts and washers c/w nuts and washers

5 No. M30 grade 8.8

washersBearing SWL 2500kN 2500kN -Shear SWL - - 700kN

2500kN Swivel Clamping Plates Type B

2500kN Swivel Type A & B - Modular Swivel Cleat

The Modular Swivel Cleat is compatible

They simply bolt onto the swivel base plate to allow bracing struts to cleat onto concrete capping beams or thrust blocks without anchoring into the concrete.

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4.3.14Issue 3

N.B Single 0.25m and 0.5m extensions should be added to these combinations for intermediate dimensions. The strut assemblies are shown at mid-stroke, so each length can vary by up to 400mm in either direction.

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4.3.15Issue 3

Face to Face

Dimension (m)

1250kN Hydraulic 2500kN Hydraulic

Min. Length (mm)

Max. Length (mm)

Leg Weight (kg)

Min. Length (mm)

Max. Length (mm)

Leg Weight (kg)

3 2536 3336 1357 2745 3545 2026

4 3536 4336 1552 3745 4545 2221

5 4536 5336 1744 4745 5545 2412

6 5536 6336 1936 5745 6545 2605

7 6536 7336 2130 6745 7545 2799

8 7536 8336 2320 7745 8545 2989

9 8536 9336 2512 8745 9545 3181

10 9536 10336 2822 9745 10545 3491

11 10536 11336 3017 10745 11545 3686

12 11536 12336 3209 11745 12545 3878

13 12536 13336 3405 12745 13545 4074

14 13536 14336 3600 13745 14545 4269

15 14536 15336 3979 14745 15545 4648

16 15536 16336 3984 15745 16545 4653

17 16536 17336 4178 16745 17545 4847

18 17536 18336 4368 17745 18545 5037

19 18536 19336 4560 18745 19545 5229

20 19536 20336 4875 19745 20545 5544

21 20536 21336 5067 20745 21545 5736

22 21536 22336 5261 21745 22545 5930

23 22536 23336 5442 22745 23545 6111

24 23536 24336 5828 23745 24545 6497

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4.3.16Issue 3

Typical Concrete Propping Application

Typical bearing detail on RC capping beam concrete corbel.

Typical bearing detail Typical bearing detail on concrete piles.

Typical steel corbel knee brace application

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4.4.1Issue 3

DescriptionSimple to assemble, heavy duty, modular bracing strut systems designed primarily to be used as cross struts

prop reinforced concrete piles and capping beams forming the walls of major basements structures. Each strut comprises hydraulic ram assemblies together with various length strut extension bars. The system can support loads of up to 2500kN and span up to 30.0m unsupported. Components are extremely heavy and are normally assembled on site prior to being lifted into place and installed within the excavation using large cranes. A variety of end bearings are available allowing the struts to be used at a range of angles.

washer assemblies. Final length adjustment is provided by a double acting hydraulic ram providing up to 800mm of stroke. Once located at the correct line and level the struts are pre-loaded (or tightened) against the faces to be supported using a hydraulic pump on the ram. Pre-loading of the legs ensures the strut cannot slip, takes up any slack or hogging in the system and minimises the extent of potential ground movements. Handling points



Product Notes1. Strut systems are very heavy and should only be assembled, installed and removed by competent persons




4. are closed prior to releasing strut from lifting chains and commencing works. When assembling on site

visible beyond the nut. Any gaps in bearing plates

pre-loading of the hydraulic rams.5. Individual components should be visually inspected

pressure or loose locking collars prior to entering the excavation.

6. personnel) and barrier protection (for plant) should always be considered.


8. When installing struts at angles great care must be taken to ensure that the angles match the design, all shear stops are in place and all elements

of transmitting loads effectively. On large unsupported spans the pre-load must be applied prior to removing vertical support to minimise sagging.

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4.4.2Issue 2

MGF 600 Series

Handling PointsWLL = 12.0t


points as shown.Assemblies can also be handled

using a fork lift on the pockets on the underside of the extensions.

Strut Flange Connection Detail600 Series Struts and Extensions are connected to each other via a

x30mm) using

and washers (recommended min. torque 400Nm).

Transition Flange Connection Detail

The transition adaptor is connected to the hydraulic strut or 400 series

(520x520x30mm) and connects to 600 Series via a circular

end plate( x30mm) both connections using 12 No. grade 8.8


MGF 406 UC Series - See Section 3




MGF Davitsafe -

See Section 6

MGF Pole Ladder

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4.4.3Issue 3

Swivel End Bearing Detail Swivels can be anchored directly to concrete or clamped to the UC Brace System using 2 No. swivel clamps as

detailed on page 4.4.12.

Cleat End Bearing Detail The end cleat is bolted to the strut or

cleat then sits on the UC section. When using this end detail MGF recommend that restraining

chains are used to prevent the strut being dislodged if struck accidently.

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4.4.4Issue 3



Axial load only2500kN Hydraulic Strut

Axial load only



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4.4.5Issue 3

600 Series extension bars range in length from 1.0m to 11.5m and are connected to each other via 12 No. grade 8.8

washers.

Product Description Product ID Weight (kg)600 Series 1.0m Extension 9.605 480600 Series 2.0m Extension 9.611 700600 Series 3.0m Extension 9.610 880600 Series 4.0m Extension 9.606 1065600 Series 7.0m Extension 9.607 1680600 Series 11.5m Extension 9.608 2600



1250kN Hydraulic Strut 8.400 1476 2276 10472500kN Hydraulic Strut 8.500 1685 2485 1716

1250kN and 2500kN hydraulic strut assembly comprises inner and outer sleeved steel box sections housing a double acting (DA) hydraulic ram to provide up to 800mm of leg adjustment.


660 tube extensions are also available, please contact MGF Design for further details.

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4.4.6Issue 3

Hydraulic Ram Inner Section Outer Section350x350x16 SHS

(+ 8 No. 100x6 thk. stiffening plates)

400x400x16 SHS






Extension Bar 600 Series610x12.5 CHS

Material Grade X70Unit Mass 184kg/mAxial SWL 2500kN

Moment SWL 1418kNm

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4.4.7Issue 3



Bore 200mm 250mmMax .Working Pressure 400 Bar (5800 psi) 500 Bar (7250 psi)



Working Temp Range -50ºC to +50ºC -50ºC to +50ºCApprox. Pre-Load 300kN 500kN

Locating Pins 30 30








QRV’s.

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4.4.8Issue 3


Weight 264kg 320kgKnee Brace/Cross Strut

Operating Range 22°- 65° 65°- 90°



These swivels can be connected directly to concrete structures or the 305 UC or 406 UC Brace Systems by bolting on the associated clamp assemblies detailed on page 4.4.12.


beams.

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4.4.9Issue 3

600 Series Adaptors

1000/600 Series Transition


Transition 1000/600 600/400Product ID 9.800 9.604

Weight 475kg 352kgMaterial

Bolting Details 12/24 No. grade 8.8 M24 c/w nuts and washers

Strut Adaptor SWL 2500kN 2500kNAxial SWL 2500kN 2500kN

Moment SWL 1125kNm 396kNmJoint Moment SWL 396/1125 kNm 277/396 kNm

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4.4.10Issue 3

N.B Single 0.25 or 0.5m 400 Series extensions should be added to these combinations for intermediate dimensions. The strut assemblies are shown at mid-stroke, so each length can vary by up to 400mm in either direction. Individual 7m pieces can be exchanged for a 3m and 4m. Additional compatible extensions are available (660 diameter / 1000 Series). Contact MGF Design department for details.

The above strut combinations use the 600 Series Extensions (610 tube).

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4.4.11Issue 3

Face to Face Dimension (m)

2500kN Hydraulic

Min. Length (mm) Max. Length (mm) Leg Weight (kg)

15 14875 15675 5660

16 15875 16675 6140

17 16875 17675 6620

18 17875 18675 6634

19 18875 19675 6785

20 19875 20675 7265

21 20875 21675 7575

22 21875 22675 7340

23 22875 23675 7910

24 23875 24675 8220

25 24875 25675 8314

26 25875 26675 8465

27 26875 27675 8474

28 27875 28675 8954

29 28875 29675 9020

30 29875 30675 9330

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4.4.12Issue 3


Swivel Clamp Type A is to be used on 2500kN Swivel Type A, when used on a knee brace connected to

Swivel Clamp Type B is to be used on 2500kN Swivel Type B, when used as a cross strut connected

Desc. Swivel Clamp Type A Swivel Clamp Type B Modular Swivel Cleat

Product ID 8.303 (305 UC)8.40016 (406 UC)

8.304 (305 UC)8.40017 (406 UC) 9.809

Weight 34kg (305 UC)46kg (406 UC)

45kg (305 UC)54kg (406 UC) 53kg

Material30mm & 25mm thk. (305

UC) or 40mm thk. (406 UC) 30mm & 25mm thk. (305

UC) or 40mm thk. (406 UC)

Bolting Details c/w nuts and washers c/w nuts and washers

5 No. M30 grade 8.8






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4.4.13Issue 3

Typical Basement Wall Application

Typical bearing detail on RC corbel.

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4.4.14Issue 3

MGF 1000 Series Strut

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4.5.1Issue 3

DescriptionSimple to assemble, heavy duty, modular bracing strut systems designed primarily to be used as cross struts with the MGF 406 UC hydraulic bracing system on major excavations. The system can also be used to prop reinforced concrete piles and capping beams forming the walls of major basements structures. Each strut comprises hydraulic ram assemblies together with various length strut extension bars. The system can support loads of up to 2500kN and span up to 45.0m unsupported. Components are extremely heavy and are normally assembled on site prior to being lifted into place and installed within the excavation using large cranes. A variety of end bearings are available allowing the struts to be used at a range of angles.

Fabricated from API grade X65 1067x14.3 hollow circular steel section, the extensions are quickly assembled

adjustment is provided by a double acting hydraulic ram providing up to 800mm of stroke. Once located at the correct line and level the struts are pre-loaded (or tightened) against the faces to be supported using a hydraulic pump on the ram. Pre-loading of the legs ensures the strut cannot slip, takes up any slack or hogging in the system and minimises the extent of potential ground movements. Handling points are provided at regular



Product Notes1. Strut systems are extremely heavy and should only be assembled, installed and removed by competent

guidelines.2. Installation is normally carried out by assembling the complete strut and then lowering into place (subject



4. all hydraulic ram isolation valves are closed prior to releasing strut from lifting chains and commencing works. When assembling on site ensure that all pins and retaining clips are in place and

gaps in bearing plates must be securely packed using grout prior

5. Individual components should be visually inspected for damage,

collars prior to entering the excavation.6.

(for personnel) and barrier protection (for plant) should always be considered.


8. When installing struts at angles great care must be taken to ensure that the angles match the design, all shear stops are in place

effectively. On large unsupported spans the pre-load must be applied prior to removing vertical support to minimise sagging.

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4.5.2Issue 3

MGF 1000 Series



points as shown.

Strut Flange Connection Detail1000 Series Struts and Extensions are connected to each other via a

x30mm) using

and washers (recommended min. torque 400Nm).

Transition Flange Connection Detail

The transition adaptor is connected

( x30mm) using 12 No. grade


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4.5.3Issue 3

Swivel End Bearing Detail

Swivels can be anchored directly to concrete or clamped to the 406 UC Brace System using 2 No. swivel clamps as

detailed on page 4.5.12.

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4.5.4Issue 3




2000

2100

2200

2300

2400

2500

2600im

um S

WL

(kN

)

1500

1600

1700

1800

1900

2000

15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45

Max

i

Strut Span (m)

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4.5.5Issue 3



1000 Series 2500kN Hydraulic Strut 8.600 1585 2385 1935

1000 Series extension bars range in length from 5.0m to 10.0m and are connected to each other via 24 No. grade

and washers.

Product Description Product ID Weight (kg)1000 Series 5.0m Extension 9.850 21051000 Series 6.0m Extension 9.860 24801000 Series 7.0m Extension 9.870 2850

1000 Series 10.0m Extension 9.899 40001000 Series 11.5m Extension 9.900 4930

2500kN hydraulic strut assembly comprises inner and outer sleeved steel box sections housing a double acting (DA) hydraulic ram to provide up to 800mm of leg adjustment.


Stronger Super 1000 Series Extensions and adaptors are available, please contact MGF Design for further details.

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4.5.6Issue 3

Extension Bar1067x14.3 CHS

Material Grade X65 (448N/mm2)Unit Mass 371kg/mAxial SWL 2500kN





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4.5.7Issue 3

Hydraulic CylinderMaterial Steel

Bore 250mmMax .Working Pressure 500 Bar (7250 psi)

Test Pressure 500 Bar (7250 psi)Approx. Working Stroke 800mm

Axial SWL 2500kN2

Working Temp Range -50ºC to +50ºCApprox. Pre-Load 500kN

Locating Pins 30



QRV’s.







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4.5.8Issue 3


Weight 264kg 320kgKnee Brace/Cross Strut

Operating Range 22°- 65° 65°- 90°



These swivels can be connected directly to concrete structures or the 406 UC Brace Systems by bolting on the associated clamp assemblies detailed on page 4.5.12.


beams.

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4.5.9Issue 3

1000 Series Adaptors



Transition 1000/600 600/400Product ID 9.800 9.604

Weight 475kg 352kgMaterial

Bolting Details 12/24 No. grade 8.8 M24 c/w nuts and washers

Strut Adaptor SWL 2500kN 2500kNAxial SWL 2500kN 2500kN

Moment SWL 1125kNm 396kNmJoint Moment SWL 396/1125 kNm 277/396 kNm

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4.5.10Issue 3

N.B Single 0.5m extensions should be added to these combinations for intermediate dimensions. The strut assemblies are shown at mid-stroke, so each length can vary by up to 400mm in either direction.

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4.5.11Issue 3

Face to Face Dimension (m)

2500kN Hydraulic

Min. Length (mm) Max. Length (mm) Approx Leg Weight (kg)

16 15535 16335 8267

17 16535 17335 8457

18 17535 18335 8647

19 18535 19335 8837

20 19535 20335 9027

21 20535 21335 10462

22 21535 22335 10652

23 22535 23335 10842

24 23535 24335 11032

25 24535 25335 11222

26 25535 26335 11416

27 26535 27335 11606

28 27535 28335 11796

29 28535 29335 11986

30 29535 30335 12176

31 30535 31335 12370

32 31535 32335 12560

33 32535 33335 12750

34 33535 34335 14181

35 34535 35335 14371

36 35535 36335 13324

37 36535 37335 14755

38 37535 38335 14945

39 38535 39335 15135

40 39535 40335 15325

41 40535 41335 15519

42 41535 42335 15709

43 42535 43335 15899

44 43535 44335 17330

45 44535 45335 17520

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4.5.12Issue 3


Desc. Swivel Clamp Type A Swivel Clamp Type B Modular Swivel CleatProduct ID 8.40016 8.40017 9.809

Weight 46kg 54kg 53kg

Material 30mm & 40mm thk. 30mm & 40mm thk.

Bolting Details

8 No. grade 8.8 M30

washers

10 No. grade 8.8 M30

washers

5 No. M30 grade 8.8


Swivel Clamp Type A is to be used on 2500kN Swivel Type A, when used on a knee brace connected to 406 UC.

Swivel Clamp Type B is to be used on 2500kN Swivel Type B, when used as a cross strut connected to 406 UC.





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4.5.13Issue 3

Typical Basement Wall Application

Typical bearing detail on RC corbel.

4 - bracing strut systems - issue 3 tech file - mgf.ltd.uk · bracing strut systems ... prior to...

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