Flexible mattress-like element usable at ballast for immobilizin

Details Flexible mattress-like element usable at ballast for immobilizin Flexible mattress-like element usable at ballast for immobilizin

1981-09-09

1984-10-16

Husar, Cornelius J.

Hydraulic and earth engineering

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

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

405 19, F16L 104, E02B 312

Patent

active

044772068

ABSTRACT:
A flexible mattress-like element usable as ballast or a load for immobilizing and protecting underwater pipelines, includes an outer flexible envelope, preferably made from a non-woven fabric, covering at least one gabion which is made from double-twist, hexagonal-mesh wire netting in the form of a somewhat-flattened parallelepiped and is filled with a mixture of stones or pebbles with a sand-, filler-, and bitumen-based mastic. The composition of the mastic is such that it is fluid at 150.degree. C. to 180.degree. C., semi-fluid at 100.degree. to 140.degree. C., plastic at 10.degree. to 50.degree. C., semi-plastic at temperatures of from 0.degree. C. to -10.degree. C., and tends to become rigid at temperatures below -10.degree. C. Each gabion is made from panels of netting in which the portions of wires which are twisted together are preferably arranged transverse the length of the gabion, that is, parallel to the axis of the pipeline to be immobilized and protected.

REFERENCES:
patent: 1165194 (1915-12-01), Maccaferri
patent: 1874567 (1932-08-01), Mechlin
patent: 3788253 (1974-01-01), Rickettson
"Gabions: Economical, Environmentally Compatible Bank Control", Civil Engineering-ASCE, Jan. 1979, pp. 58-61.

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