Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Submerging – raising – or manipulating line of pipe or cable...
Patent
1978-03-09
1980-02-26
Taylor, Dennis L.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
Submerging, raising, or manipulating line of pipe or cable...
405163, 405164, E02F 502
Patent
active
041903820
ABSTRACT:
A method and apparatus for entrenching an elongated pipeline and the like uses a trenching apparatus having a trench cutting assembly which is detachably connected to a sled base. A floating vessel has means to control positioning of the trenching apparatus, including means to raise and lower, and to connect and disconnect, the trench cutting assembly and the sled base. Several methods and apparatus are disclosed for raising and lowering the trench cutting assembly while leaving the sled base positioned on the bottom of the body of water, straddling the elongated pipeline. In each embodiment, the cutting means may be lifted on board the vessel for maintenance and/or repair, leaving the sled base in position relative to the pipeline. Means are provided for abandoning the sled base at the entrenching site and returning later to lower the trench cutting assembly into its operational relationship with the sled base.
REFERENCES:
patent: 3952532 (1976-04-01), Spearman
patent: 3990377 (1976-11-01), Marquinez
patent: 4037422 (1977-07-01), DeBoer
Lochridge Joe C.
Morgan William A.
Schmitz Thomas R.
Srivastav Avadhesh N. L.
Brown & Root, Inc.
Taylor Dennis L.
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