| 摘要 |
PURPOSE:To conduct crashing of coarse sediment on a sea bottom simultaneous ly with dredging without worsening environment, by a method wherein a screw cutter, moving in and out with the aid of a link mechanism, is mounted in the soil dredging hopper of a soil collector bulldozer. CONSTITUTION:A soil collecting bulldozer 13 is lowered on a sea bottom, a jet current is produced within a soil dredging hopper 30, an screw cutter 35 is rotated, and a cylinder 44 is moved backward. This causes a screw cutter 35 to approach and part from the sea bottom through the working of a link mechanism 36 to crash coarse sediment on the sea bottom to agitate it together with solid soil. The crashed substance is sucked through a soil suck flexible pipe, and is guided to a separating tank in a barge body. Mounting of the screw cutter 35 enables crashing of the coarse sediment on the sea bottom simultaneously with dredging without worsening environment, and enables simpli fication of a work.
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