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Continuous Flight Augercast (CFA) Piles

Augercast Piles are installed by rotating a continuously flighted hollow shaft auger into the soil to a specified or required depth. A high strength, high slump cement grout mix is pressure pumped through the hollow shaft as the auger is slowly withdrawn. The resulting cement grout column hardens and forms an augercast pile.

A reinforcing cage, when required, can be installed while the cement grout is still fluid, or in the case of full length single reinforcing bars, inserted through the hollow shaft of the auger prior to the withdrawal and grouting process. Anderson Drilling uses an electronic data recording system to instill a high level of quality assurance during CFA pile construction. Our Pile Installation Recorder (PIR) provides real-time information for each pile constructed, electronically monitoring and recording such things as drill advance rate, machine torque and grout volume. The information is continuously visible so our operators may make educated adjustments during the CFA pile installation process. Once a pile is completed a report may be generated confirming the pile profile and specified parameters as proof of proper quality control.

ADVANTAGES TO CFA PILES
Speed of installation Irregular profile leads to high friction values Low vibration and noise Small to medium axial or lateral loads

IDEAL GEOTECHNICAL CONDITIONS include:
Medium to very stiff clay soils Medium dense to dense, variably graded sand mixtures Weakly cemented sands Residual soils

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