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Contractors World  - UK & Ireland
2013 Vol 3 No 6
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Groundforce Expertise in Support Solutions - page 2 of 5

The third frame was installed at 7.25 m AOD before the trench was excavated to its maximum depth of 5.5 m AOD (7 m below ground level), at which point a 50 mm blinding slab and 400 mm thick concrete pile cap were cast. Once this had reached sufficient strength, the frames at levels 2 and 3 were removed to allow space to install the pipeline.

Such were the lateral forces imposed by the poor ground that Groundforce had to supply 80 tonne capacity MP80 mechanical struts to brace the frames. “The ground was so unstable that we had to isolate the hydraulic rams and weld the frames to ensure there was no movement,” says Mr Smith.

Molesey Weir on the River Thames near Hampton Court.

Groundforce takes to the water at Molesey Weir

work is done in the river itself, which has required the use of a 95 tonne barge-mounted craneOn this project, Groundforce Shorco has supplied its modular Megabrace frame and MP250 hydraulic struts to contractors replacing the Molesey Weir on the River Thames near Hampton Court.

Molesey Weir was built in 1815 and forms one of the longest locks on the Thames. Joint venture contractor Team Van Oord (TVO) has the Environment Agency contract to rebuild Weir B at the site and replace the existing gates with new hand-wound radial gates.

All the work is done in the river itself, which has required the use of a 95 tonne barge-mounted crane and the construction of sheet-piled coffer dams to give access to the river bed and weir structures.

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