Method for restoring underground pipelines

Details Method for restoring underground pipelines Method for restoring underground pipelines

1989-05-05

1990-06-05

Bryant, III, James E.

Pipes and tubular conduits

Repairing

Patches

138 97, 405154, 264 36, F16L 100

Patent

active

049305425

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.

REFERENCES:
patent: 123092 (1872-01-01), Divelbiss et al.
patent: 3750711 (1973-08-01), Conklin et al.
patent: 3753766 (1973-08-01), Brown et al.
patent: 4352594 (1982-10-01), Vemura et al.
patent: 4507019 (1985-03-01), Thompson
patent: 4634313 (1987-01-01), Robbins
patent: 4647256 (1987-03-01), Hahn et al.

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