Device for laying underground or digging up subsea conduits

E - Fixed Constructions – 02 – F

Patent

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61/5.5

E02F 5/10 (2006.01) E02F 3/92 (2006.01) E02F 5/00 (2006.01)

Patent

CA 1187296

ABSTRACT OF THE DISCLOSURE: A device for burying a conduit on a seabed of incoherent material and for digging up a conduit buried in a seabed of incoherent material. The device comprises: a pair of scooping units adapted for positioning on opposite sides of the conduit, wherein each unit includes a venturi tube having an intermediate portion of restricted cross section. A slurry tube is within the venturi tube and has an upper end at the restricted cross section of the venturi tube and a lower end extending below the venturi tube adapted to be positioned on one side of the conduit and adjacent the seabed. Disaggregating nozzles are slidably mounted about the lower end of the slurry tube having tele- scopic means connected thereto for vertically moving the nozzles relative to the seabed, to thereby control disag- gregation. Means are connected to the nozzles for feeding water under pressure therethrough whereupon the jets of water from the nozzles disaggregate the seabed and form a slurry. Means are connected to each of the venturi tubes for feeding water under pressure therethrough wherein a negative pressure is created which causes the slurry to be withdrawn from the seabed into and through the venturi tubes. Guiding means are provided for positioning the device on the conduit as it moves therealong for digging up and burying the conduit.

402153

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