초록 ▼

A portable extraction tool facilitates soil stabilization applications that utilize compaction grouting. Compaction grouting involves installing grout injection casing into the ground in fixed-length sections to depths limited by soil compaction or bedrock. The casing is then removed in stages. Betw

A portable extraction tool facilitates soil stabilization applications that utilize compaction grouting. Compaction grouting involves installing grout injection casing into the ground in fixed-length sections to depths limited by soil compaction or bedrock. The casing is then removed in stages. Between stages, grout is pumped through the casing and into the soil at high pressure. The extraction tool provides the power, gripping strength, stability and operator control required to pull casings from the ground at a desired rate. Pulling power is provided by a pair of hydraulic cylinders. Gripping strength is provided by a progressive chuck mechanism that secures injection casings on upward movements of the cylinders and releases casings on downward movements, without damaging the reusable casings. Stability and strength are provided by a heavy, large-footprint base plate. The base plate and chuck have aligned, open-face slots to provide easy positioning of the tool on installed casings and to utilize casings for lateral support. Inherent tool stability and multiple integrated steps allow a person to safely stand on the tool. This enables an operator to monitor a grout pressure gauge and pump stroke counter and to perform casing disassembly high above the tool, eliminating the need for external ladders or platforms. The tool is provided with turf tires and a handle and designed to be easily moved and operated in rough earth and limited access conditions by one or two persons. The tires are suspended above ground in the tool operating position to avoid destabilizing the tool.

대표청구항 ▼

[ What is claimed is:] [1.]1. An extraction tool for progressively jacking a shaft from its surrounding media comprising:a lift having a stationary end and a moveable end;a block assembly attached to said moveable end, said block assembly defining an interior space configured to accommodate said sha

[ What is claimed is:] [1.]1. An extraction tool for progressively jacking a shaft from its surrounding media comprising:a lift having a stationary end and a moveable end;a block assembly attached to said moveable end, said block assembly defining an interior space configured to accommodate said shaft; anda plurality of opposing grips configured to have an open position and a closed position disposed around said shaft within said interior space, each of said grips distal the other of said grips in said open position and proximate the other of said grips in said closed position, said grips, while in said closed position, configured to have a loose grip position and a tight grip position on said shaft wherein, as said moveable end extends from said stationary end, said grips move to said tight grip position and, as said moveable end retracts toward said stationary end, said grips move to said loose grip position, so that said grips remain in said closed position as said lift extends and retracts, alternately securing said shaft to said block assembly and releasing said shaft from said block assembly, respectively.