Process and device for temporarily supporting the walls of a tre

Details Process and device for temporarily supporting the walls of a tre Process and device for temporarily supporting the walls of a tre

1987-04-10

1989-02-21

Corbin, David H.

Hydraulic and earth engineering

Subterranean or submarine pipe or cable laying, retrieving,...

Submerging, raising, or manipulating line of pipe or cable...

405157, F16L 104

Patent

active

048060496

ABSTRACT:
In a trench is disposed a closed flexible envelope filled with a fluid having a density or pressure greater than that of the surrounding fluid, movable by itself under the effect of the pressure exerted at its end by said pipe, which envelope is in the form of a cylinder each end of which has been turned in concentrically to its longitudinal axis, in the direction of the opposite end, the two central portions of this turning in being welded together so as to form a central envelope web turned in along its axis.

REFERENCES:
patent: 3699690 (1972-10-01), Watter

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