Helical screw pile and soil displacement device with curved blades

摘要

A helical screw pile having a soil displacement device (lead displacement plate) on its shaft above at least one helical plate, which pulls the pile into the ground when the shaft is rotated. The lead displacement plate has a disk that carries at least two curved, axially extending bottom blades, which preferably extend beyond the disk periphery. The axial height of the blades preferably is greater than the axial pitch of the helical plate(s) divided by the number of blades. The top of the disk has an axially extending adapter ring that defines an annular seat for centering a tubular casing. Extension displacement plates can be used between extension shafts for centering additional tubular casings.

主权项

1. A soil displacement device for penetrating and forming a void in the ground when rotated about a central longitudinal axis by a helix-bearing shaft, the device comprising:
a disk having a periphery, a top, a bottom and a central through-opening for receiving a shaft; and at least two blades disposed substantially completely below the top of the disk, each blade projecting substantially axially from said bottom to a free distal axial edge and curving outward from near said opening to at least said periphery, each said blade having concave trailing face and a convex leading face and an end portion spaced radially outward from said opening to displace soil radially outward and enhance soil packing when rotated in the ground penetrating direction, said end portion of each said blade defining a trailing end of said blade extending beyond a periphery of said disk where the end portion is substantially normal to the radius of the disk and, said convex leading face of said blade extending parallel to an axis of said center through-opening and said trailing face sloping toward said disk, and where said free distal axial edge of each of said blades are substantially coplanar and lie in a plane oriented substantially perpendicular to a center axis of said disk.