PURPOSE:To clean up a harbor by a method in which an assembly of reinforced concretes fixed with grating is set in the vicinity of a breakwater, and dust is collected into the latticework. CONSTITUTION:Reinforced concrete 27 fitted with a grating 1 having an entrance gate 3 is set on the tip portion of a breakwater 16. A reinforced concrete 13 with a grating 10, a reinforced concrete 12 with a steel plate 19, and a reinforced concrete 11 with a grating 9 are orderly set in the vicinity of the concrete 27. At the ebb tide,dust is directed into the gratings 1, and at the high tide, dust is arrested by the gratings 9 and 10 to avoid the discharge of dust. When dust is accumulated in the grating 1, the exit gate 3 is opened and dust is scooped by the conveyer net of a cleaning ship.
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