Method for restoring underground pipelines

Details Method for restoring underground pipelines Method for restoring underground pipelines

F - Mech Eng,Light,Heat,Weapons

16

L

61/4.6

F16L 55/18 (2006.01) E21B 7/30 (2006.01) F16L 55/165 (2006.01)

Patent

CA 1257483

ABSTRACT Method for restoring underground pipelines (11B) wherein short-pipes (17) are pressed one after the other intermittently into the pipeline end to end. An expansion piercer (18) or similar broaching tool is pushed through the pipeline at the leading end of the pipe string formed by the short-pipes and is brought to expand so as to split or, if splitting is not necessary, to widen the pipeline to substantially circular cross-sectional form. FIG. 1.

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