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|Location:||Chapel Street, Rugby|
|Summary:||Design, supply and installation of steel sheet piles to form a permanent sheet pile basement cofferdam for the car park for the new town centre store. The clutches were sealed by welding to give a watertight basement.|
Sheet Piling (UK) Ltd were employed by Principal Contractor RG Group to design, supply and install a watertight steel sheet pile cofferdam to form a car parking basement to the proposed new ASDA store.
The sheet piling design required NSP 111W section steel sheet piles in 6m & 8m lengths, however in one area it was decided to use NSP ZU-1600 section sheet piles 9m long, which have been recently introduced to the UK by Sheet Piling (UK) Ltd. The ZU-1600 section is 900mm wide and has the advantage of less clutch welding being required in a sheet pile basement.
The soils consisted of approximately 1.5m of made ground, overlying approximately 4m of medium dense sand, overlying stiff to very stiff clay.
A total of 537 No 111W section and 64 No ZU-1600 section sheet piles were installed giving a total perimeter of approximately 380 linear metres. The sheet pile installation was completed in six weeks including the backdriving.
The sheet pile installation was carried out using a Bauer RTG16 telescopic leader rig with 1000kN variable moment vibro hammer. The backdriving was carried out using a 2.4 tonne hydraulic drop hammer.
The design requirement was for the metal sheet piles to support vertical loads from the building and this was verified by carrying out non-destructive dynamic pile testing on random piles using the Pile Driving Analyser and CAPWAP calculation.
The clutches of the steel sheet piles were welded to give a fully watertight basement and a concrete capping beam was constructed by the Principal Contractor.