Bored Displacement Piling is ideally suited for Brownfield sites with contaminated soils as it produces minimal spoil at ground level during construction. The advantages brought by Bored Displacement Piling systems include improved soil strength, pile capacity and load transfer to the surrounding ground. The technique also offers a reduction in overall foundation costs by reducing pile lengths and diameters and substantially decreasing, or even, removing the cost of pile spoil disposal.
This method utilises a purpose-built auger head to laterally displace the soil during installation, as opposed to excavation, which occurs during CFA or bored pile construction. As the boring tool penetrates, granular soils are displaced resulting in a localised increased relative density and strength around the pile, depending upon soil conditions. Improved load transfer to the surrounding ground is achieved through an enhanced shaft capacity. Thick concrete threads are created in the construction process which facilitates the load transfer from pile core to soil. Should reinforcement be required, this is installed into the concrete after completion of the pile.