Chester Road, Manchester
The secant wall is adjacent to the existing canal. The piles are to be 600mm (secant) and 900mm (contiguous) diameter and spaced at 900mm (secant) and 1050mm (contiguous) centres up to 20m long. The contract period was 10 weeks and rig weights were restricted to a maximum of 30 tonnes.
Soils vary significantly across the site, with made ground overlying sandstone generally within 4m of ground level requiring powerful machinery to penetrate it. To the Northern boundary adjacent to the canal, loose sand and silt with a high water table necessitated a secant cut off wall to prevent water ingress.
The Chester Road project was itself the beneficiary of “lessons learned” at previous projects in the Great Jackson Street area, with deflection monitoring data from Owen Street & Crown Street being used to assist with third party& highways approvals. Further data collected from Chester Road includes the addition of inclinometer monitoring, which will support future projects in the area. Foundation Piling provided “early contractor involvement” advice to the client and design consultant on both this scheme and other schemes.