Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Cast in situ
Patent
1989-06-09
1990-09-11
Taylor, Dennis L.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
Cast in situ
138 97, 405154, F16L 5516
Patent
active
049557556
ABSTRACT:
A device for the in situ repair of pipes (e.g. stormwater or sewerage) inaccessible from the inside, comprises a front module (1) and a rear module (2) each module being fitted with mobile arms (3, 5) and hydraulic displacement means (4, 6) connectable to an hydraulic pump at surface level. In their inoperative position, the arms (3, 5) form a diameter which is much smaller than that of the pipe (7) to be repaired. In their operative position, the arms (3, 5) form a diameter which is either similar to or slightly smaller than that of the pipe (7) to be repaired. The front module (1) thus, through the pressure exerted by the arms on the damaged inside walls of the pipe (7), acts both as a widener and as a guide, to restore the pipe (7) to its original diameter and to facilitate passage along the pipe of the rear module (2). The rear module (2) is fitted at each end thereof with sealing elements (9) which, in conjunction with the pipe (7), define a chamber (10) into which leads at least one tube (11) for feeding sealing product, the tube being connectable to a pump (12) at surface level.
REFERENCES:
patent: 2851061 (1958-09-01), Bernard et al.
patent: 3602263 (1971-08-01), Bremner
patent: 4371569 (1988-02-01), Muta et al.
patent: 4377984 (1983-03-01), Donnelly
patent: 4429720 (1984-02-01), Beck et al.
patent: 4848964 (1989-07-01), Yarnell
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