mgf stock an extensive range of hot rolled the uk. … · tel. 01942 402 704 mgf technical file...

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5.2.6Issue 2

MGF stock an extensive range of hot rolled U Piles including Arcelor Mittal and Hoesch, making us the largest independent stockist in the UK.

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5.3.1Issue 2

5.Issu

Description

Simple to assemble, two sided, hydraulic bracing system designed to be used with steel trench sheets to

support trench widths of 0.6m to 3.8m and is normally installed using excavators. MGF also provide Vertishore, a light weight hydraulic system used to brace small trenches vertically.

attached to the hydraulic struts using simple pin and retaining clip assemblies. Each strut contains a hydraulic ram with between 300mm and 670mm of stroke. Connecting the rams (via hydraulic hoses) to an MGF hand

easily adjusted to suit the excavation dimensions. Once the trench frames are fully assembled and located at the correct line and level, the rams are pre-loaded against the trench sheets using a hydraulic pump. Pre-loading of the legs ensures the frame cannot slip and minimises the extent of potential ground movements. Self sealing quick release valves and mechanical isolation valves ensure that the hydraulic ram pressure cannot be accidently released once installed. Handling and restraining points are provided on each waler to assist assembly / removal and to allow the brace to be supported off MGF restraining chains attached to the trench sheets by hooks.

MGF can supply the systems with a full range of suitable handling and restraining chains, Edgesafe edge protection panels, Endsafe end protection panels and struts, Laddersafe access platforms and pole ladders,

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 Notes

1. Waler and trench strut systems should only be installed and removed by competent persons in accordance

can be located at a variety of positions along the length of the waler. The exact location of the struts will determine the strength of the waler system.

2. Installation is normally carried out by lowering the assembled frame to the correct installation level and pre-

slip. Max pre-load pressure of 100Bar (1500psi) must not be exceeded.3. Restraining chains are hung off the trench sheets and attached to the waler to assist assembly / removal

of the frame and ensure vertical support is provided at all times. All the supplied restraining chains should be installed (min 2 per waler) and adjusted to ensure an even vertical load distribution. Restraining chains should never be used for lifting nor solely relied upon to suspend loads above personnel.

4. Ensure all hydraulic ram isolation valves are closed and all strut pins in place and secured using the retaining clips provided prior to commencing works.

5. Individual walers and struts should be visually inspected for damage,

6. Walers and struts should always be installed square and plumb to the excavation walls ensuring contact with all the inward facing trench sheet pans. If this is not possible any gaps must be securely packed by using

7. Safe access/egress, edge protection (for personnel) and barrier protection (for plant) should always be considered.

8. Prior to removal of systems all hydraulic rams must be released and retracted to avoid the need for excessive extraction forces and to avoid damaging the struts.

9. No matter how much care is taken during the installation and removal of waler and strut trench systems some ground movement will occur in the areas immediately surrounding the excavation. Great care must be taken when specifying these systems for use adjacent to existing structures and services.

10. Ends of trench runs should always be battered back at a safe angle or end protection panels/struts installed (see section 6).

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5.3.2Issue 2

MGF Pole Ladder

MGF Endsafe Panel -

See Section 6

MGF Steel

Walers

MGF Laddersafe -

See Section 6

MGF Edgesafe - See

Section 6

MGF Trench Sheets -

See Section 5.2

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5.3.3Issue 2

Restraining Chain Connection DetailThere are 2 types of chains used, the top frame will use

shackle to hook type, while lower frames will use shackle

to shackle type.

Individual chain links selected to ensure all restraining

chains are evenly loaded.

Waler Strut Connection DetailWaler struts are connected to the

waler via a pin and retaining clip

detail.

Chain to Sheet Connection DetailHandling PointWLL = 2.0t

Walers are lifted and handled by

attaching MGF lifting chains to the

handling/restraining points as shown.

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5.3.4Issue 2

Type Medium Duty Steel

Waler Lengths 2.0m, 2.5m & 3.0m

Material Grade S275

Moment Capacity 12.7kNm

Section Modulus 69cm3


Waler Lengths 3.5m & 4.0m

Material Grade S275




Waler Lengths 5.0m

Material Grade S275



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5.3.5Issue 2

Type Heavy Duty Steel

Waler Lengths 3.0m - 5.0m

Material Grade S460



Type Medium Duty Aluminium

Waler Lengths 2.0m - 4.0m

Material Grade 6082T6



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5.3.6Issue 2

Medium Duty Steel Walers Sheet to Sheet (mm)

Desc.Waler

Weight (kg)Code

L

(mm)

W

(mm)

C*MAX

(mm)Min Max

Assembled

Weight** (kg)

2000 70 1.120 2000 83 1420 565 3800 176

2500 88 1.125 2500 83 1920 565 3800 212

3000 97 1.130 3000 83 2420 565 3800 230

3500 112 1.135 3500 93 2920 565 3800 260

4000 129 1.240 4000 93 3420 565 3800 294

5000 180 1.250 5000 116 4370 565 3800 396

* Depends of strut locations

** Assembled weight includes 2 No. type 800 struts

Medium Duty Steel Waler

Heavy Duty Steel Waler

Heavy Duty Steel Walers Sheet to Sheet (mm)

Desc.Waler

Weight (kg)Code

L

(mm)

W

(mm)

C*MAX

(mm)Min Max

Assembled

Weight** (kg)

3000 100 1.330 3000 108 2420 565 3800 236

4000 133 1.340 4000 108 3420 565 3800 302

5000 166 1.350 5000 108 4420 565 3800 368



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5.3.7Issue 2

Medium Duty Aluminium Waler

Medium Duty Aluminium Walers Sheet to Sheet (mm)

Desc.Waler

Weight (kg)Code

L

(mm)

W

(mm)

C*MAX

(mm)Min Max

Assembled

Weight** (kg)

1500 18 1.015 1500 100 1010 565 3800 78

2000 24 1.020 2000 100 1510 565 3800 84

2500 30 1.025 2500 100 1910 565 3800 96

3000 36 1.030 3000 100 2410 565 3800 108

4000 47 1.040 4000 100 3310 565 3800 130



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5.3.8Issue 2

80kN Single Acting Hydraulic Ram Assembly

Pump Units

Product ID 1.602 (SA)

Capacity 20 litres

Shoring Fluid Houghto Safe SF25

Installation Pressure 0-1500 psi

The pump is used to extend and retract the waler strut single acting hydraulic rams. The pumps contain bio-degradable Houghto Safe SF25

diluted with 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).

the full bore side of the piston through the male QRV. Single acting cylinders cannot be retracted using a pump unit and have to be physically closed whilst releasing the male QRV.Ensure isolation valve is closed to maintain pre-load pressure and before release/connection of QRV’s.

Hydraulic Cylinder Single Acting

Material Aluminium

Bore 50.8mm

Max .Working Pressure 400 Bar (6000 psi)

Test Pressure 400 Bar (6000 psi)

Approx. Working Stroke 800mm

Axial SWL 80kN

Min. FOS (by test) 2

Working Temp Range -20ºC* to +50ºC

Approx. Pre-Load 20kN

Locating Pins 18 and 20mm

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5.3.9Issue 2

Waler Struts - Hydraulic

Single acting (SWL=80kN)

Ext. Dims.

Type Code Min Max Weight (kg)

600 (A) 1.455 550 900 13

800 (C) 1.480 800 1400 18

Ext. Min Max Weight (kg)

1 1.525 250 N/A 5

2 1.550 500 N/A 10

3 1.510 1000 N/A 20

The waler hydraulic strut is connected to the waler using a pin

and retaining clip detail.

The waler strut extension is bolted to the

hydraulic strut using 4 No. M10 grade 8.8 bolts c/w nuts and washers. The

strut extension is connected to the waler using a pin and retaining clip

detail.

Extension bar88.9 x 5.0 CHS

Grade S275

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5.3.10Issue 2

SWL for Medium Duty Steel Walers at Various Strut Positions

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5.3.11Issue 2

SWL for Heavy Duty Steel Walers at Various Strut Positions

SWL for Aluminium Walers at Various Strut Positions

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5.3.12Issue 2

Aluminium Vertishore

Pre-assembled, light weight, two sided hydraulic waler strut system designed to be installed from ground level directly against a soil face in the vertical plane. Suitable for trenches up to 2.0m deep and 1.4m wide. The System can be installed

term utilities type trench work where the ground is considered self supporting and capable of arching a min. 1.5m between preloaded hydraulic vertical supports for the duration of the works. Backing boards are available to prevent localised pockets of loose material entering the excavation. Personnel should only enter and work in the space between two vertishores. A competent person should always inspect the excavation before allowing access to ensure that all the struts are pre-loaded and bearing directly onto the soil, the exposed soil faces are self supporting with no evidence of water ingress or very loose material. Vertical support must be provided at a max. 1.5m

Always install and remove the system from ground level and away from any potentially unstable edges. Vertishores are supplied with an installation kit, including a pump unit, lowering hook and valve release tool.

Available hydraulic strutsType A : 550-900mmType B: 700-1200mmType C: 800-1400mm

SWL = 20kN/m (on Vertishore)

* Assembled weight (excluding boards)

with type A struts

Desc. Product ID Weight* (kg)

1500 1.014 28

2000 1.013 35

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5.3.13Issue 2

Waler End Protection Strut

Waler Hydraulic Strut and EndSafe Strut Connection Pin

Pinlong

Material Grade 080M40 (EN8)

Shear SWL 80kN

Inner Material 90x90x4 SHS (S355)

Inner Unit Mass 10.5kg/m

Outer Material 100x100x4 SHS (S355)

Outer Unit Mass 11.9kg/m

MGF Endsafe Struts are suitable for use in smaller excavations when it is not possible to safely batter the ends of the trench back to ground level. The simple telescopic strut system can be easily installed and removed by one person at the end of a waler run to support trench sheets. The pin connecting the inner and outer sections should always be used for safe handling purposes and can be removed once installed. The minimum overlap between the strut inner and outer is

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5.3.14Issue 2

Safe Working Load for MGF End Protection Struts

Safe Working Load for Waler End Protection Struts

Recommended SWL

Arrows indicate recommended inner section lengths to achieve desired range.

mgf stock an extensive range of hot rolled the uk. … · tel. 01942 402 704 mgf technical file...

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