Apparatus and method for extracting horizontal underground pipe

Details Apparatus and method for extracting horizontal underground pipe Apparatus and method for extracting horizontal underground pipe

F - Mech Eng,Light,Heat,Weapons

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F16L 1/00 (2006.01) E21B 7/04 (2006.01) E21B 19/00 (2006.01) E21B 31/20 (2006.01) F16L 55/165 (2006.01)

Patent

CA 1216276

- 29 - APPARATUS AND METHOD FOR EXTRACTING HORIZONTAL UNDERGROUND PIPE ABSTRACT OF THE DISCLOSURE An apparatus and method for withdrawing exist- ing outdated water pipe provides a frame assembly for mounting in a first shaft excavated at the water pipe. The frame includes a ram for inserting and withdrawing rod sections from the water pipe. A head assembly for mounting on the rods includes leaf spring centering devices and a plurality of single tooth dogs spring bias- ed outwardly. When inserted into the existing pipe, the dogs spring outwardly so that the teeth engage a radially end face at the far end of a pipe section so the pipe section and head can be withdrawn. A severing device for clamping and fracturing a portion of the pipe withdrawn into the shaft is positioned adjacent a front face of the frame.

462053

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