Construction of a new waste water treatment plant at Bewsey Bridge, near Warrington by contractor DCT Civil Engineering is being eased through use of Groundforce’s Mega Brace struts.
The £10M project for United Utilities will replace two existing sewage pumping stations and reduce the risk of pollution in the Sankey Valley area during exceptionally heavy rainfall.
“Normally, a project like this would be built from the top down, but because of the need to prevent contamination of the underlying sandstone aquifer from the former tip material in the upper 5 to 6m, we had to excavate the area and build the plant from the bottom up,” said DCT site agent Stewart Lowe.
As material was progressively excavated from within the piled retaining walls that form the 25m diameter octagonal chanmber, DCT installed the Mega Brace hydraulic struts to support the sheet piles. “The brace system provided the lateral support without having to span the excavation – otherwise we’d never have got the diggers in there,” said Lowe.
DCT is now in the process of the building the internal concrete structures and installing the mechanical and electrical equipment ready for completion of the project in September 2013.