Patent ID: 6402432
Filing Date: 2002-06-11
Classification: E02D

Abstract:
A method of forming an underground cast-in-situ pile, with no extraction of material, using a hollow pile-forming tool comprising a body having a longitudinal axis, aperture means in the region of its lower end, and attached to its lower end, blade means which extend beyond the diameter of the body, the method comprising:a) pushing the tool non-rotatorily into the ground substantially in the direction of its longitudinal axis, in a substantially non-percussive manner to a first depth; b) rotating the tool such that the blade means displace soil at or close to the base of the tool, and concomitantly pumping concrete or grout along the length of the tool and through the aperture means so as to assist the blade means in the displacement of soil and generate an enlarged base for the resulting pile; and c) withdrawing the tool while concrete or grout continues to be pumped along the length of the tool.