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Continuous flight auger pile (CFA)
Construction Sequence
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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.
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