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

1985-08-26

1986-12-02

Husar, Cornelius J.

Hydraulic and earth engineering

Subterranean or submarine pipe or cable laying, retrieving,...

Repair, replacement, or improvement

405154, 175 53, 175375, 254 79R, 166 551, E02F 510

Patent

active

046261346

ABSTRACT:
An apparatus and method for withdrawing existing outdated water pipe provides a frame assembly for mounting in a first shaft excavated at the water pipe.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 biased 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so that the teeth engage a radially end face at the far end of a pipe section so the pipe section and head can be withdrawn. A severing device for clamping and fracturing a portion of the pipe withdrawn into the shaft is positioned adjacent a front face of the frame.

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patent: 3870098 (1975-03-01), Houston
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patent: 4422800 (1983-12-01), Parish
patent: 4434969 (1984-03-01), Van Ruden
patent: 4492274 (1985-01-01), Schosek
patent: 4507019 (1985-03-01), Thompson

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