Continuous Flight Auger CFA piling is a proven piling option and has the advantage of minimal noise and vibration during installation, using fast and manoeuvrable equipment.
It is a cast in-situ process, very suited to soft ground where deep casings or use of drilling support fluids might otherwise be needed.
CFA piling is a non displacement piling system; hence the soil excavated from the pile is brought to the surface. CFA piles can be an attractive alternative to conventional bored piles (faster installation) and to driven piles (much less noise and vibration).
The construction sequence as below:
Phase 1: Drilling a hole with CFA auger.
Phase 2: After reaching the design toe level, concrete is pumped through the hollow stem while the auger is with draw. And while pulling up, the flight are cleaned by an auger cleaner.
Phase 3: Push or vibrate the reinforcement cage into the freshly poured pile.
Piling Contractors CFA range offers the following advantages:
1, Diameters from 400 to 1000mm
2, Depths up to 30m
3, Able to carry high load/ shear/ moment capacity
4, Minimal noise and vibration during installation
5, Fast speed of installation
6, Can overcome Interbedded clays and sands
7, Can deal with water bearing sands and gravels and penetrate weak rocks
