Transportation and Filling of the Dredged Sand by Solid-Liquid Flow

Abstract

During the Tohoku earthquake, the tsunami had created a large scale seabed scour at the entrance of the port of Hachinohe in Japan. This damage would pose a problem to the safety of the navigation ships. So it was necessary to carry out a backfill work with dredged sand to ensure the safety of the navigation ships. Hence we introduced the construction method of dredging and filling by using cutter suction dredger and sand filling vessel. This method was carried out using a filled sand which was dredged by cutter suction dredger and then delivered via discharge pipe to the sand filling vessel. It was then placed on the designated area using tremie pipe which was equipped on the sand filling vessel.