| 摘要 |
Submarine pipe trenching apparatus for digging a trench below submarine pipelines, wherein jet supports having nozzles for digging into the ground are supported for oscillatory movement on a frame, and wherein a crawler assembly is mounted on the pipe for moving the jets supports along and below the pipe when the liquid is propelled through the nozzles for digging out the soil below the pipe. The nozzles may include orifice plate means defining their outlets and inclined so that liquid emanating therefrom strikes the earth formation at a small acute angle.
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