Method for restoring underground pipelines
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United States of America Patent
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-
Jun 5, 1990
Issued Date -
N/A
app pub date -
May 5, 1989
filing date -
Nov 25, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Method for restoring underground pipeline (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.
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