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

From major infrastructures, such as the London Crossrail scheme, to smaller projects, Groundforce has been supporting the construction industry for over 20 years with an ever increasing portfolio of products and services.

Groundforce has supplied a range of specialist equipment, including MP80, Mega Brace, Maxi Brace and double-acting Mechshore braces to install a new large-diameter pipeline at a Yorkshire wastewater treatment works. Naburn wastewater works gets support

Groundforce has supplied a range of specialist equipment, including MP80, Mega Brace, Maxi Brace and double-acting Mechshore braces to install a new large-diameter pipeline at a Yorkshire wastewater treatment works.

The contract, at the Naburn WWTW, involves the laying of a new 1.6 m diameter steel pipe to carry sewage sludge across the site to the final settlement tanks, where it is prepared for de-watering and disposal. Improvements are being led by Black & Veatch as principal contractor.

The route of the 100 m long pipeline crosses several existing services which the new pipe must run beneath. This has meant digging down as deep as 7 m to get enough clearance.

“The pipeline passes through the location of old sludge lagoons and the ground condition here is very poor,” says Richard Kent, section engineer with Black & Veatch.

“Approximately half of the trench had to be supported with steel sheet piles which needed to be heavily braced,” he added.

The shallower stretches of the 3.2 m wide trenchs were lined with standard trench sheets and supported with double-acting Mechshore braces but where the pipe dived down to clear an existing FST feed pipe crossing the new excavation, heavier equipment was required.

“The deeper section was lined with interlocking sheet piles and three levels of frame were installed to support the sides,” explains Groundforce technical services engineer Oliver Smith.

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.     This was done in a pre-specified installation sequence. First the sheets were driven to full depth and the ground excavated to 11.6 m AOD where the first Mega Brace frame was installed. B&V then excavated to 9.25 m AOD, exposing the existing FST feed pipe, at which point the second frame was installed.


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