Continuous flight auger (CFA) piling is a highly versatile technique for installing foundations in a wide range of ground conditions. Fast, quiet, and virtually vibration-free, the method is ideal when working next to buildings, homes and in environmentally sensitive areas.
What is CFA piling used for?
Continuous flight auger (CFA) piles are a quick and economical solution suitable for most ground conditions and construction projects. This method is one of the quietest forms of piling which is virtually vibration free. Ideal solution for projects in urban locations where noise levels need to be kept to a minimum. CFA piles can be designed to provide both vertical, lateral and tension support.
How are CFA piles installed?
CFA piles are constructed using a continuous hollow stemmed helical auger which is rotated into the ground to the design depths. On reaching the founding level, high slump or flow concrete is pumped through the hollow stem in a controlled manner ensuring a static head while the auger is extracted simultaneously. Pile arising resulting from the process are cleared from the auger using an auger cleaner as the auger is extracted. The method of installation enables piles to be formed in water bearing strata without the need for temporary casings. The pile reinforcing cage is then inserted into the concrete.
Throughout the installation process sophisticated onboard computers monitor both the boring and concreting process. The real-time system provides the operator feedback regarding key installation parameters including auger depth, casing depth, auger revolutions, drill pressure/auger torque, strata details and water strikes observed during the boring phase. The cloud based online data portal allows engineering teams to monitor their contracts and individual pile installation from remote locations in real time.
Key capabilities
- Rig loadings: 33 – 85 tonnes
- Pile diameter: 300 – 1,200mm
- Maximum depth: 35m
- Working load: Up to 8,000kN
