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Horses for courses where piles are concerned
There are specific areas where run-of-the-mill foundations just won’t do and Canvey Island in Essex can be one of those places. There the contractor, Homestead plc, is building 46 flats and six shops on the seafront and the poor ground conditions have made piled foundations necessary by the specialists Aarsleff.
According to consulting engineer for the project, John Sime & Associates, Canvey Island has a standard design for all buildings, based on what is called a Canvey raft. Essex County Council provide an allowable bearing capacity for foundation design, but the problem on the Homestead job is that there are shops on the ground floor with a big block of flats over. So the load couldn’t be spread adequately for a Canvey raft.
Aarsleff, using one of its own Banut 700 rigs, install 154 precast concrete piles of 250mm square section, made by Aarsleff’s pile manufacturing subsidiary Centrum Pile. All piles are between 26m and 28m long and mechanically jointed with a 14m under pile and pin jointed over pile, all in accordance with BS En 12794 (class 1 A).
The are driven through layers of soft alluvium, loose sand and alluvium and peat to toe into underlying dense sand and gravel to take the required maximum 475kN working load.
More information: www.aarsleff.co.uk
One Response to “Horses for courses where piles are concerned”
ecoadmin says:
Homes are being built more and more on land that needs special attention. So its essential that there are companies with the expertise to deal with the problems.