VIBRATING AND LEVELING WORK FOR RUBBLE MOUND UNDER WATER

摘要

PURPOSE:To level off the upside of rubble mound at a fixed depth by means of a leveling weight by a method in which the water depth above the rubble mound is detected by a depth detector with a rubble mound leveler and the frequency of a vibrator is cntrolled by the output signal of the depth detector. CONSTITUTION:When the internal pressure of an air supply pipe 7 becomes higher than the external water pressure when opening a valve 9, a one-way valve 8 is opened and bubbles of air flow into an air pipe 6. Under the condition that a weight 3 is placed on the upside 14 of a rubble mound 13 under water, a vibrator inside a casing 4 is operated to vertically vibrate a rubble leveler 2 and also to move it toward the horizontal direction. The vibration in the internal pressure of the air pipe 6 with the depth of water is put in an arithmetic unit 11 through a pressure gauge 10 and the water depth to the lower side of the leveling weight 3 is calculated. When the weight 3 goes down and reaches a fixed value by vibration, the frequency of the vibrator is reduced by controlling a control board 12 by the arithmetic unit 11 and the upside 14 of the rubble mound layer 13 is kept at a fixed depth.