Process and apparatus for installing a new pipe inside an...

B - Operations – Transporting – 29 – C

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189/12, 154/53.2

B29C 31/00 (2006.01) B29C 53/08 (2006.01) B29C 53/10 (2006.01) B29C 63/34 (2006.01) E03F 3/06 (2006.01) F16L 55/165 (2006.01)

Patent

CA 1286581

Abstract or the Disclosure A thermoplastic pipe in a flattened and folded con- figuration and of selected characteristics is formed either by manufacturing it in this reduced shape or by heating a round thermoplastic pipe enough to make it pliable and then reducing its cross sectional dimension. It is inserted in this reduced dimension and in a pliable state into a pipe to be rebuilt. It is then expanded and when set series as a rigid or semi-rigid pipe within a pipe capable of with- standing external hydrostatic and earth pressures. The thermoplastic pipe is heated during its installation for installing it in an exiting pipe and for expanding it. In a preferred process, the thermoplastic pipe upon being reduced in dimension is wound on a roll and is unwound from such roll during installation in an existing pipe.

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