Deep Foundations

Temporary Cased Bored Piles

Bored Piles are constructed using the conventional Kelly bar method and are commonly used across Australia especially within the commercial, residential, resource and infrastructure sectors due to there ability to carry high structural loads along with penetration into rock founding material.

Where temporary casing is required. The casing is advanced through the overlying other than rock material depending on in-situ ground conditions generally by using a combination of removal of material through drilling and advancing of the casing by either rotation with the drill rig or vibratory hammers.

This process is undertaken until the casing founding level is reached. Typically, at the top of the rock socket or where stable material is encountered.

Once the rock socket of the pile has been removed, and cleaned, a full-length reinforcing cage is placed into the bore, which is then filled with concrete using the tremie placement process. Following the placement of the concrete the casing is then removed either with the rig, an oscillator or vibratory hammer.

Continuous Flight Auger Piles

The Continuous Flight Auger (CFA) method is a rotary drilling method that uses a hollow stem continuous flight auger as the drilling tool. The soil loaded on the auger prevents the surrounding ground from caving during the process, as an unsupported hole never occurs.

When the final design depth is reached, concrete is pumped through the hollow stem auger to the bottom of the pile, as the auger is extracted under positive pressure. Following the placement of the concrete a reinforcement cage is plunged through the fluid concrete, where necessary assisted by vibration. The CFA process is highly productive and vibration free.