Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Submerging – raising – or manipulating line of pipe or cable...
Patent
1977-10-11
1979-02-27
Shapiro, Jacob
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
Submerging, raising, or manipulating line of pipe or cable...
37193, F16L 100, E02F 506
Patent
active
041416678
ABSTRACT:
A method and apparatus for laying pipeline in a bed substantially under water. Pipe is placed on the bed along the general line the pipeline will take. A trench is excavated in the bed generally parallel to the pipe by transporting spoil to the opposite side of the trench as the pipe and by excavating sufficient material adjacent the pipe so that the pipe will be supported by the bed after initial excavation but so that the bed ultimately will shear along a shear line under the weight of the pipe alone, so that the pipe will drop into the trench along with the material of the bed above the shear line. Material that has fallen into the trench after collapse of the pipe into the trench can be shifted out of the trench. The plow used for trenching includes a tandem set of wheels mounted to a forward portion of a frame, a center line of the plow extending between the wheels posterior thereof. A first share is mounted to the frame member posterior of the wheels and located asymmetrically with respect to the center line, and a mouldboard extends from the share to the opposite side of the center line as the share for depositing spoil on the opposite side of the center line as the share, and for counterbalancing the eccentric reaction on the share during trenching due to its asymmetrical mounting. A second share mounted posterior of the first share and also located asymmetrically with respect to the center line provides for removal of the material that falls into the trench with the pipe. Two sets of guide rollers are provided mounting to the frame and rotatable about vertical axes for engaging the pipe and guiding the movement of the plow as it is pulled during trenching.
REFERENCES:
patent: 2144063 (1939-01-01), Irvin
patent: 3978679 (1976-09-01), Lecomte
patent: 3995439 (1976-12-01), Hahlbrock
R. J. Brown and Associates AG
Shapiro Jacob
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