Patent ID: 6168350
Filing Date: 2001-01-02
Classification: E02D

Abstract:
A method of installing a cast-in-situ pile, comprising the steps of: i) fitting a collar device having a central aperture to a lower end of a piling tool; ii) penetrating the ground with the piling tool and the collar device for a first period until the collar device has displaced or removed a predetermined surface volume of soil; iii) disconnecting the collar device from the piling tool and penetrating the ground with the piling tool for a second period until a predetermined depth is reached, the piling tool passing freely through the central aperture of the collar device; iv) withdrawing the piling tool while concomitantly supplying concrete or grout to the lower end of the piling tool so as to form an underground column of concrete or grout; v) withdrawing the collar device as the end of the piling tool is withdrawn from the ground, thereby leaving an enlarged diameter void at the surface of the ground while concomitantly supplying concrete or grout to the lower end of the piling tool so as to fill the void with concrete or grout and form an enlarged diameter pile head.