GMP were engaged to design and install 1624 No. Continuous Flight Auger (CFA) bearing piles under three tower blocks within the Regency Heights Project in Park Royal, London. The development is comprised of a mixture of residential and commercial units. When the Piling commenced the site had been reduced by an approximate depth of 3.50m, to facilitate the basement construction. All piling platforms were within an array of sheet piles, with higher level access ramps joining the site together.
Variability of pile loads, due to the varying height of superstructures, meant that a range of pile diameters from 400mm-900mm were utilised. Pile depths ranged from a minimum of 8.00m to a maximum of 28.00m and were all founded within the stiff London clay. Due to the close proximity of an office block Continuous Flight Auger (CFA) piling was deemed the optimum technique to minimise neighbour disturbance.
Effective collaboration with the Contractor, their appointed groundworker and our competent supply chain ensured that the total duration for the piling works was completed ahead of schedule, at 32 weeks. A total of 19 successful static load tests were undertaken – 18 of those being working piles and one of them being sacrificial. The sacrificial test was used to prove the design of the piles under the main core for the tallest tower block, coming in at 22 storeys.