CFA

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Continuous Flight Auger (CFA) piles

CFA piles (aka ACP) are installed using a hollow stem continuous flight auger will the drill bit and plug at the tip. The auger is rotated and advanced through the ground to the design tip elevation.  Concrete is then pumped through the hollow stem and forced into the borehole as the auger is slowly retrieved.  Once the auger is removed from the ground and the borehole is filled with concrete, steel reinforcing is placed.  The steel reinforcing can consist of a circular cage, one center bar, or both. These economical piles range in diameter from 14- to greater than 36-in with depths extending up to approximately 200-ft.

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