| 摘要 |
PURPOSE:To raise the accuracy of construction work by a method in which an echo sounder is provided from the swinging direction of a suction head to each given direction to measure the top position of each sludge, the jumping height of the sludge, and distances from the seabed face. CONSTITUTION:Echo sounders 6F and 6B capable of measuring the distance of sludge 5 of the seabed from the sludge face are set at a distance of about 1m on front side F and back side B at almost right angle to the swinging angle S of a suction head 3, by which the depth of construction is detected. The depth of the head 3 in the sludge is detected by the sounder 6R provided ahead of the swinging direction S, and the jumping height of sludge 5 is detected by the sounder 6L provided in the back side. Since the finish face in the sounder 6L can be controlled on the basis of relationships of the measured values by the sounders 6B and 6L, the dredging performance can be raised by preventing incomplete dredging work and also minimizing the loss by overdredging. |
