Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – By means advancing along terrain and guiding pipe or cable...
Patent
1995-06-01
1996-09-24
Neuder, William P.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
By means advancing along terrain and guiding pipe or cable...
2541344, E02F 510
Patent
active
055584659
ABSTRACT:
To lay an underground cable, a first drum is stationarily positioned and supplies the cable to a trench that is dug in the ground. A hauling pig is connected to the leading end of the cable. A second drum, mounted to a movable tractor, supplies a tube to the trench and is intended to receive the cable. The tractor also has a plowshare mounted to its forward end for forming the trench as the tractor moves. A compressor is connected to a tube section, rearwardly of the pig, for propelling the leading end of the cable to a predetermined point in a turn of a rolled tube as stored on the second drum. In the event an obstacle is encountered by the tractor, the compressor is interrupted and a length of tube, at least as long as one turn on the second roll, is payed out from the second drum and temporarily remains unoccupied by cable. The payed out length of tube is cut at an end so that the tractor becomes free to move around the obstacle. The payed out length is repositioned to negotiate the obstacle and the cut end is then spliced to the corresponding end of the tube on the second drum. Restoration of compressor operation continues to propel the leading end of the cable to the predetermined point in the turn of the rolled tube on the second drum.
REFERENCES:
patent: 3390533 (1968-07-01), Gremillion
patent: 4529148 (1985-07-01), Hesprich et al.
patent: 4629363 (1986-12-01), Rose et al.
patent: 4896997 (1990-01-01), Gaylin
patent: 4981396 (1991-01-01), Albertson et al.
patent: 5263686 (1993-11-01), Sano et al.
Lesueur Philippe
Pecot Alain
France Telecom
Neuder William P.
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