Method and apparatus for simultaneous trenching and pipe laying

Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Submerging – raising – or manipulating line of pipe or cable...

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Details

405158, 405168, F16L 104

Patent

active

047100591

ABSTRACT:
Disclosed is an apparatus for simultaneously trenching and laying a submarine pipeline within the bed of a body of water covered with a relatively thick ice mass. The apparatus comprises a pipeline construction spread which precedes a trenching and pipe installation spread, both of which traverse the ice mass. The pipe installation vehicle advances toward the constructed pipeline, elevates the pipeline, forms a slot-like opening in the ice and directs the pipeline into the water through the slot. A submersible dredging assembly extends from a installation vehicle which forms part of the installation spread. As the vehicle advances, the dredging assembly forms a trench in the sea bed. At the same time the dredging assembly guides the pipeline into the trench and provides support to a submerged component of the pipeline which is threaded through a slot in the dredging assembly.

REFERENCES:
patent: 3583170 (1971-06-01), De Vries
patent: 3978679 (1976-09-01), Le Comte
patent: 4126013 (1978-11-01), McGovern
patent: 4575280 (1986-03-01), Hemphill et al.
patent: 4616956 (1986-10-01), Hemphill

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