| 摘要 |
PROBLEM TO BE SOLVED: To enhance dredging efficiency not only by making drainage, which is brought about by separating dredged sediment and water, jetted in a dredged part so as to blow up the sediment but also by making the drainage jetted reversely near a suction port for the dredged sediment so as to produce an ejection effect, and decrease as much pollution of a dredged sea area as possible by circulating the drainage without discharging the drainage on a sea bottom. SOLUTION: The sediment accumulated on the sea bottom is dredged by a suction pump 11. The dredged sediment and water are separated by a separating means 15, and the drainage brought about by separation is made to flow back by a drainage pump 17. The drainage made to flow back is pressurized by a booster pump 12 and jetted from a jet nozzle 26 near the dredged part in order to blow up the accumulated sediment. The drainage is jetted reversely from an ejection nozzle 24 provided at the center of a wrapper tube 20, so as to enhance a suction effect.
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