Rotary Displacement Piles are constructed in a similar manner to CFA piles, but instead of a continuous flight auger, a tapered boring tool is used, which as it penetrates the ground it displaces the soil thereby increased relative density and strength (depending upon soil conditions). Minimal spoil comes to the surface which is not flighted up to the surface.
On reaching the design depth, concrete is pumped down the hollow stem of the auger to the base of the pile to fill the void left by the tool being extracted before the ground has a chance to close up.
A reinforcing cage is then plunged into the pile, like the process undertaken for CFA piles.
Through our links to the Soletanche Bachy Group, March are pleased to be able to bring to New Zealand the patented SCREWSOL system where by load transfer of the pile can be further improved to the surrounding ground using a threading mechanism incorporated into the tool, which forms a thread.
Concrete threads are created when the tool is extracted that increase the diameter/surface area of the bore and therefore its load bearing capacity, which facilitates the load transfer from pile core to soil.
With the telemetry gained through our rigs onboard computer, we are able to calculate the installation energy of each pile installed, which allows us to verify and validate in real time a pile’s load capacity. Just another example of our smart edge