Augercast piles, also known as continuous flight auger piles (CFA), are deep foundation elements that are cast-in-place, using a hollow stem auger with continuous flights. The auger is drilled into the soil and/or rock to design depth. The auger is then slowly extracted, removing the drilled soil/rock as concrete or grout is pumped through the hollow stem. The grout pressure and volume must be carefully controlled to construct a continuous pile without defects. Reinforcing steel is then lowered into the wet concrete or grout. The finished foundation element resists compressive, uplift and lateral loads. The technique has been used to support buildings, tanks, towers and bridges.
This technique is available in most areas through either Hayward Baker or sister Keller companies. Contact your local Hayward Baker office for more information.