Trenching method

Details Trenching method Trenching method

E - Fixed Constructions

02

F

61/5.5

E02F 5/10 (2006.01) F16L 1/04 (1980.01)

Patent

CA 1133264

ABSTRACT OF THE INVENTION A method for trenching beneath an elongated member lying on the bottom of a body of water comprises trenching from one side of and to a position extending beneath the elongated member and removing spoil to form a first trench, trenching from the other side of and to a position extending beneath the elongated member and removing the spoil to form a second trench extending into the first trench, the trenching steps occurring successively and so that the elongated member falls into the resulting first and second trenches. The apparatus used for the method has a movable frame member, at least one cutting assembly, an assembly support means connected to the frame member for supporting each cutting assembly and for moving each cutting assembly at least in a laterally directed plane, and a spoil removal system. Each cutting assembly comprises at least two actuatable cutting tools which are driven for cutting movement relative to cutting tool axes.

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