Auger Cast are installed by rotating a continuous flight hollow shaft auger into the soil to a specified depth or to refusal. High strength sand cement grout is pumped through the hollow shaft as the auger is slowly withdrawn while slowly turning in a clockwise direction.
A reinforcement cage is installed while the cement grout is still fluid. If the reinforcing is installed after the pile is grouted centralizers are used to maintain the required clearances.
Some advantages to auger cast piles are: less noise, no vibration, possible cost savings and no casing requirement.