| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To increase a pollution diffusion preventive effect, and to lower energy consumption of a pump for pollution circulation, when dropping sediment to a water bottom using a tremie pipe. <P>SOLUTION: When preventing pollution diffusion by providing a hood 5 arranged to surround a periphery of a sediment dropping area on a lower end of a tremie pipe 1 and circulating water inside the hood 1 into an upper end of the tremie pipe 1 by a pump 10, sensors 13 and 14 for detecting a water level are attached inside the tremie pipe 1, water level change by dropping of the sediment into the tremie pipe 1 is detected by the sensors 13 and 14, and the pump 10 is controlled in linkage with detected fluctuation of the water level. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
