Patent ID: 8250787
Filing Date: 2012-08-28
Classification: E04H

Abstract:
1. A method for removing a post from the ground, comprising: a. providing a spike tool which is able to insert into said ground to depth of said post b. providing a supply of pressurized fluid to said spike tool c. introducing said spike tool into said ground to depth of said post at one location or a plurality of locations at perimeter of said post d. flowing said pressurized fluid through said spike tool to base of said post e. controlling flow velocity of said pressurized fluid so as to prevent excavation of said ground f. forming a seal between surface of said ground and said post and said spike tool g. mixing of said fluid with said ground at boundary of said post with said ground to form a low-friction fluidized layer h. continuing flow of said pressurized fluid during lifting operation of said post to neutralize suction force and generating positive lifting pressure force to bottom of said post i. lifting the post from the ground using levers or other mechanical advantage mechanisms whereby the post is removed from the ground and leaving a hole with a clean boundary that is substantially equal to the dimension of the post that was removed, with no significant excavation or displacement of the ground around the post.