MGF GSSW-02.1A User manual

Brand: MGF

Model: GSSW-02.1A

Type: User manual

MGF GSSW-02.1A is a two sided excavation support system designed for simple assembly and robust support in weak, problematic, or saturated ground. It features telescopic struts for adjusting to required lengths, 4-leg chains for easy handling, and secure connections with pins and r-clips. The MGF GSSW-02.1A enables safe excavation and shoring, providing a stable environment for construction and maintenance work.

Trench Boxes

GSSW/02.1A 4

06.03.2012

1. If used in very weak, problematic or

saturated ground always ensure a site specific

temporary works design is provided.

2. Always inspect lifting points prior to every

lifting operation and ensure all personnel are

well clear of operation.

3. Flying of the box above the base of the

excavation is not recommended.

4. Only access the box via a suitable secured

ladder placed within the box. Never enter via

the ends/faces of an unsupported excavation.

5. Always ensure all pins and retaining clips

are correctly fitted prior to use.

6. If box becomes stuck in the ground only

use designated extraction chains to release

each corner at a time. N.B. Extraction loads of

up to 50t can be generated.

7. Do not allow personnel to enter the box

whilst excavator is moving box.

8. Always ensure the box is evenly supported

by the ground on opposite faces to avoid

boxes becoming unstable.

9. Always work from a position of safety.

Avoid working above on an unsupported edge,

an unprotected edge or under a suspended

load.

10. Very heavy equipment to be installed by

competent groundwork contractors only.

11. Take care to avoid accidently striking

struts or using struts for lifting/moving the box.

12. Avoid standing on steel panels especially

when wet.

13. Do not assemble panels on top of other

panels or on sloping ground as they can

potentially slide when attaching the top panel.

14. Warning! Assembled boxes do not have

fully rigid connections and panels can tilt or

rotate during assembly or handling. Do not

rest ladders against panels.

15. Keep hands and fingers away from pinch

points when making connections.

16. Prior to permitting entry always ensure;

panels are installed plumb, square and level to

each other. All components are fitted and show

no signs of damage or distress and a safe

means of access/egress is provided from

within the box.

www.mgf.co.uk

MGF Trench Boxes are simple assembly, robust,

two sided excavation support systems, install with

an excavator utilising the dig and push or excavate

and lower in place techniques. This guide will

detail a dig and push installation sequence.

Assembly of a box commences by lowering the

first panel flat onto timber skids, using the

provided MGF 4-leg chains.

Adjust the telescopic struts to the required length

by sleeving the inner within the outer and

securing them together using a pin and r-clip.

Keep hands/fingers away from connection and

pinch points.

Lower the struts into the panel pockets and secure

using pins and r-clips.

Pins should be inserted from outside the panel.

Lower the second panel onto the struts using an

MGF 4 leg chain. Carefully align the panel

pockets with the strut ends. Lock into position

with pins and r-clips. Once secure, release the

4-leg chain.

Lift the assembled box into a vertical position by

using the MGF chain.

Installation normally commences by excavating to

a maximum of 1m below ground level (if site

conditions permit).

Lower the box into the excavation using an MGF 4

leg chain. Release the chains. An operative on

even ground should remove chains only if the box

upstand is 1m above ground level.

Carefully dig and push each panel down using the

excavator bucket on the corners of each panel.

Push the box downwards in no more than 300mm

increments. Excavating ahead of the panel cutting

edges as required. Take care to avoid damage.

Once the base unit is at a sufficient depth a top

unit can be added.

Lower the top onto base and connect together to

form a single box ensuring all 4 top to base

connection points are fully secured.

The pins are inserted from the outside and r-clips

are fitted from the inside.

Always ensure a safe secure means of access is

provided prior to entry.

Dig and push the assembled box to the required

depth.

If an additional top is required repeat steps J to K.

On reaching the final depth secure the box by

backfilling against the panels and if required

batter back the open ends of the excavation.

End safe panels or trench sheets can be used to

secure the ends.

Shoring Safety Products can now be installed.

Subject to a final inspection the excavation is now

safe to enter.

Note: Make sure the panels are installed plumb,

square and level to each other.

Extraction of the boxes normally commences by

backfilling around the installed structure. Any

shoring safety products attached to the boxes

should now be removed.

Attach an extraction chain in turn, to each top

extraction point. Slowly apply an upward force to

break any adhesion that may have occurred

between the panel and the ground.

Progressively backfill the excavation as the box is

removed.

Once the top unit is clear of the ground connect an

MGF 4 leg chain and remove the 4 pins at the

connection points, before lifting the top clear of the

excavation.

Repeat the extraction process for the base unit

until the base can be removed. Backfill and

compact the ground.

Standard Duty

4-Leg Chain

Extraction Chain

Only use chains supplied by MGF

for handling, installing and

removing MGF box systems.

See MGF channel

for installation guidance:

https://www.youtube.com/user/MGFLtd

Telescopic Strut

Connection

Strut Pocket

Connection

100 Thick Top to Base

Drop Down Connection

60 Thick Top to Base

Fork Down Connection

Lifting/Extraction

point

Connector Pin

and r-clip

ASSEMBLY

INSTALLATION

REMOVAL

MGF GSSW-02.1A User manual

MGF GSSW-02.1A User manual

MGF GSSW-02.1A User manual

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