ACIP piles are constructed by rotating a continuous-flight, hollow-stem auger into the ground to the specified bearing depth, or until the refusal criteria are reached. Fluid grout is then pumped, under pressure, through the hollow stem and out of a port on the bit, as the auger is withdrawn in such a way as to exert a positive grout pressure on the soil surrounding the drilled hole. ACIP piles may be referred to by several other names, some of which are proprietary or used by specific contractors. Some common names are auger cast, Auger Pressure Grouted (APG), continuous flight auger (CFA), Augerpile, augered grout injected, augered uncased, and uncased cast-in-place.
