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CFA – Continuous Flight Auger

Bachy Soletanche Australia offer all types of bored piles – temporary and permanently lined as well as under fluid temporary using polymer or bentonite support. The bored piles can also be drilled in secant pattern for a retaining or cut-off wall. We can install 300mm to 3000mm large diameter piles, to depths of up to 60 metres. High strength rock can be drilled using specially adapted drilling tools.

Our largest piling machine, the BAUER BG40 has 60 t.M of torque and is capable of drilling 3 metre diameter piles. Bachy Soletanche also owns a range of small to medium size modern hydraulic piling machines allowing us to also complete very small projects. We continue to develop our very high strength rock drilling capacity and have recently trialled cluster drill technology as one method of economically drilling high strength rock.

What is Continous Flight Auger?

Continuous Flight Auger (CFA) is a piling technique that is widely used in civil engineering and construction projects. To do this, a continuous flight auger is required, which is a hollow stem auger with a continuous spiral flight welded to the outer diameter. While the auger is spun into the ground, concrete or grout is pumped into the hollow stem, filling the hole from the bottom up. Continuously pouring concrete or grout to fill up any gaps creates a solid and robust pile.


CFA is a rapid and efficient method that can be used to construct piles of different diameters and depths and is successful with a variety of soil types, including clay, sand, and gravel. It is frequently utilised in high-rise buildings, bridges, and other infrastructure projects because it is an affordable and dependable alternative for building foundations, retaining walls, and other structures.

Continuous Flight Auger - bored piles

Bachy Soletanche has a range of geotechnical techniques to suit your needs.

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