As observed in the figure below, constant auger is used to drill the borehole, carry up drilled soil, and pour concrete whilst the auger is moved up. Due to this fact, the borehole doesn't want casing or hydrostatic stress to forestall damage to the borehole wall. Objective of this plumbing https://knoxdueif.activoblog.com/34633429/everything-about-cast-in-situ-piles-in-bangladesh