As observed in the figure beneath, continuous auger is utilized to drill the borehole, elevate up drilled soil, and pour concrete even though the auger is moved up. Because of this, the borehole does not need to have casing or hydrostatic pressure to prevent harm to the borehole wall. From https://castinsitupiles89900.madmouseblog.com/13044228/cast-in-situ-piles-in-bangladesh-options