04738565 is referenced by 54 patents and cites 18 patents.

A method for replacing an existing buried pipe of a crackable, fracturable material. By the application of a local intense pressure, the pipe is cracked and fractured into irregular fragments which are spread outwardly to provide space for a new replacement tubular assembly which is moved into the space as the pipe is fractured and the fragments spread. At least a portion of the outward spreading of the fragments occurs under the action of the intense local pressure. An apparatus used to carry out the method may be pushed and/or pulled through the existing main, and the pushing force may be applied by percussive action.

Title
Method of replacing mains
Application Number
326138
Publication Number
4738565
Application Date
August 4, 1986
Publication Date
April 19, 1988
Inventor
Roger England
Clitheroe
GB
Francis D Wilson
Blackburn
GB
Roy Streatfield
Bilsborrow, Nr. Preston
GB
Agent
Larson and Taylor
Assignee
British Gas Corporation
GB
IPC
F16L 55/00
F16L 1/00
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