News
Strongford STW Storm Water Improvements
DAWSON-WAM and Simplex Foundations are each engaged in sub-contracts for the installation of two different types of piling for the preliminary construction works of new storm water tank facilities for the £8m Strongford Storm Scheme for which the Principal Contractor is Black & Veatch, a leading global engineering, consulting and construction company.
The Severn Trent Water scheme provides a replacement system for the storage and return of 19,755m3 of storm sewage at its Strongford facility located by the River Trent at Barlaston, Stoke-on-Trent.
Simplex Foundations’ piling works provide the foundations of the four 40m diameter circular storm tanks. Their installation comprises 680 400mm diameter and 52 450mm CFA piles with lengths ranging from 9.0 – 18.5m. Installation is with a single Soilmec CM70 piling rig.
DAWSON-WAM’s piling works provide 4 circular and 1 rectangular temporary sheet pile cofferdams to enable below ground construction works of the central tank hoppers and the Storm Return Pumping Station. The largest of the cofferdams is 10m deep and 18m x 13m in plan, constructed using 16m length piles which are driven a minimum of 2m into bedrock. Pile installation is with an ABI leader rig and vibrating hammer.
The circular cofferdams are propped using an external reinforced concrete ring beam cast at ground level – and in the case of the two structures nearest to the river, a second internal concrete ring is to be provided at lower level.
Process and outline design for the whole scheme was undertaken by Grontmij. Design development was by Black & Veatch. The overall contract has a timeframe of 71 weeks and is due for completion before Christmas 2009.