Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,...
Patent
1995-04-28
1997-05-13
Tsay, Frank
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
405184, 175 53, F16L 100, E21D 106
Patent
active
056285850
ABSTRACT:
The present invention is directed to a method for removing a utility pipe or main and replacing the main with a polyolefin pipe. More specifically, the unique apparatus or system of the present invention includes a rotating head connected to a plurality of pipe joints to remove the old pipe, usually concrete or tile, by cutting, chipping and grinding. The head has an outer periphery of roller bits which cut, chip and grind the old pipe or earth into pieces which pass inwardly through the head. Behind the head is a non-rotating member which opens and packs the hole formed by the head for the replacement polyolefin pipe which is pulled into the hole by the member.
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Parish, II Robert O.
Reber Cleve C.
Gaskin Mary J.
Tsay Frank
TTI Trenchless Technologies, Inc.
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