CONTINUOUS FLIGHT AUGER (CFA) PILING

Vibration free and low noise, this environmentally friendly piling system is ideally suited to installation in unstable soil conditions and urban environments. Vibropile has Australia's largest fleet of high capacity CFA rigs which has made us a world leader in this field. Our technology and methods enable us to construct CFA piles with higher load capacities and to greater depths than any of our competitors.

With load bearing characteristics superior to conventional bored piles, CFA piling can be installed through unstable and saturated soils, where conventional bored piles would require the use of drilling fluids and/or extensive and costly casing.

CFA is a method in which a pile is formed by drilling into the ground with a continuously flighted auger.  Upon completion of drilling, concrete is injected under pressure through the hollow stem of the auger, and this pressure is maintained throughout the extraction process.  A steel reinforcing cage is then inserted into the concrete.

To ensure pile quality and integrity, all of our rigs are fitted with on-board computers which monitor penetration rate, torque, extraction rate, concrete pressure and oversupply in real time.

Diameters ranging from 400mm to 1200mm are available to depths in excess of 40 metres.

Rock socketing of CFA piling is also feasible in medium strength rock, by using special cutting heads, thus enabling the installation of extremely high-load capacity piles.

Continuous Flight Auger (CFA) Piling involves four stages:

1.       Pile is bored using a Continuous Flight Auger.
2.       Concrete is injected under pressure.
3.       The Auger is extracted.
4.       A steel reinforcing cage is inserted into the concrete.