Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – With forming or cutting of pipe or cable
Patent
1994-05-12
1996-04-16
Dang, Hoang C.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
With forming or cutting of pipe or cable
405184, F16L 5518, F16L 1028
Patent
active
055075975
ABSTRACT:
The underground pipe replacement method and apparatus includes placing a ripping tool having cutting blades into the bore of one end of the existing pipe; pulling the ripping tool through the bore of the existing pipe and cutting a plurality of slots through the wall of the existing pipe; disposing a length of rods throughout the existing pipe as the ripping tool passes through the existing pipe; plugging one end of the ripped pipe and allowing water to pass through the open end of the pipe; allowing the water to stand in the existing pipe and flow through the slots in the pipe and into the formation; softening the earth formation around the pipe; and crushing the existing pipe with a crushing tool.
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