Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Submerging – raising – or manipulating line of pipe or cable...
Patent
1986-10-14
1988-07-19
Crowder, Clifford D.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
Submerging, raising, or manipulating line of pipe or cable...
37 54, 37 98, 405159, E02F 502
Patent
active
047581166
ABSTRACT:
A ditching machine for digging a ditch or a trench for submarine cables having at least several pairs of blades disposed along the longitudinal direction of the center body of the machine. At least the blades in the forward position have a ditching portion which ditches soil, and a soil-pushing portion which pushes the soil thus ditched away in a direction lateral to the moving direction of the ditching machine. The soil-pushing portion is at the top of the ditching portion and has a wider horizontal width as seen from front of the ditching machine than that of the ditching portion when the ditching machine is in a normal operation position. Further, the tapering angle at the bottom of the center body being in the range between 10.degree. and 17.degree. and the towing tension of the towing wire between the ditching machine and the work ship is considerably reduced.
REFERENCES:
patent: 4053998 (1977-10-01), Ezoe
patent: 4312144 (1982-01-01), Ezoe
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