Method for installing a screw pile
OwnerMamdouh A. Nasrinventor
Life of this patent
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Abstract
A screw pile is equipped with internal grout pipes extending downwardly through the bore of the tubular pile shaft. The grout pipes connect with side-opening ports in the shaft side wall, to form conduits through which fluid grout may be injected into the surrounding ground. The grout is injected at high pressure as the pile is rotatively driven into a sub-surface target formation in which the pile is to be landed. In this way, the grout is distributed along a vertical interval of formation. It has been shown that this technique is characterized by increased load capacities of the implanted pile, relative to piles implanted without grouting or with grouting but only at landed depth.
Claims3
A method for installing a load-bearing pile in the ground, comprising:
- providing a screw pile comprising a tubular shaft having a side wall forming an internal longitudinal bore, the side wall having a lower end portion carrying at least one externally mounted helix, the lower end portion forming at least one side-opening port extending therethrough;
- providing a head assembly connected to an upper end of the screw pile, the head assembling having a swivel;
- rotationally driving the screw pile into the ground to penetrate a sub-surface formation in which the end portion is to be landed at a total depth;
- injecting grout into the formation through a hose connected to the swivel and then through the shaft and ports at high pressure as the screw pile is rotated into the formation wherein the hose remains stationary, and wherein:
- the shaft has a plurality of internal pipes extending into the bore from its upper end, the lower end portion forms a plurality of side-opening ports which are spaced apart along said lower end portion, the internal pipes are connected with the ports to form a plurality of grout conduits;
- and comprising:
- injecting grout into the formation through each grout conduit at high pressure as the screw pile is rotated into the formation.
Dependencies are inferred from the claim text.