Continuous flight auger pile (CFA)

The “Continuous Flight Auger” or CFA pile is an auger bored ‘replacement’ pile with soil extraction and pumping of concrete under pressure. The pile is formed by means of a helical screw (auger) with a hollow stem bored in to the ground to design depth. Concreting is achieved by pumping fluid concrete through the hollow stem of the auger, delivering concrete to the bottom of the pile bore. Pile arisings are brought to the surface during drilling and concreting phase.

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Fields of application

Able to construct piles into highly stratified layers of soil comprising very resistant layers
As a single pile or as an element of a piled wall (contiguous and secant piled walls)
As an alternative for large diameter bored piles
Infrastructure and industrial projects

Environmental impact

In vibration sensitive areas: no vibration is induced as the pile is formed by a hydraulic boring technique as opposed to a percussive element.
In a noise-sensitive environment: low noise level generated compared to other methods of piling.
The concrete used to form the pile has a high energy input to make the cement, but this can be off-set by the use of ground blast furnace slag as a cement replacement (which would otherwise be a waste product).
Removal of soil from the job site (CFA piling is a ‘replacement’ technique and creates pile spoil which will require disposal)
A dry stable, and level working platform is required.

Our Techniques

Ground Improvement