Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Submerging – raising – or manipulating line of pipe or cable...
Patent
1979-02-02
1981-06-23
Taylor, Dennis L.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
Submerging, raising, or manipulating line of pipe or cable...
405160, 405162, E02F 502, E02F 514
Patent
active
042747600
ABSTRACT:
This invention relates to the self-propelled underwater trenching apparatus and method for burying pipelines, cables and the like with minimum underwater diver supervision. The apparatus includes a frame having frame members positioned about the pipeline. Drive rollers are connected to the frame members for drive engagement with the pipeline. The frame members are movable about a pivot to selectively engage into or disengage rollers out of drive engagement with the pipeline. The apparatus also may include extensible means to move the pivot axis laterally or transversely of the pipeline. The formation is cut away by water jets secured to the apparatus to enable the pipeline to be buried in the trench formed. Upon meeting an obstruction on the surface of the pipeline, power rams in the fore portion of the frame member separate the frame member that may bend the frame member to bring the forward drive rollers out of driving engagement with the pipeline. The hydraulic propulsion system directs fluid flow to the aft drive rollers in driving engagement with the pipeline to move the apparatus forwardly until the forward drive rollers have overridden the obstruction. The sequence is reversed to utilize the forward drive rollers to move the apparatus along the pipeline until the aft drive rollers have overridden the pipeline.
REFERENCES:
patent: 3004392 (1961-10-01), Symmank
patent: 3368358 (1968-02-01), Elliott
patent: 3717003 (1973-02-01), Bates et al.
patent: 3732701 (1973-05-01), Lynch
patent: 3751927 (1973-08-01), Perot
patent: 3877237 (1975-04-01), Norman
patent: 3995439 (1976-12-01), Hahlbrock
patent: 4037422 (1977-07-01), de Boer et al.
Keegan Francis A.
Taylor Dennis L.
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