CONSTRUCTION WORK OF UNDERGROUND CONTINUOUS WALL AND SEPARATOR FOR EXCESS CONCRETE THEREOF

摘要

PURPOSE:To raise the accuracy of trenching operation by a method in which a high-pressure hose through which high-pressure water is supplied is inserted into the draw hole of an interlocking pipe, and concrete is separated by jet water from a jet nozzle being raised slowly. CONSTITUTION:A device (a) is lowered to the draw hole 25 of an interlocking pipe 2, and a direction-confirming and correcting rod 11 is operated in such a way as to exactly make a jet nozzle 17 face with the mountain side. A pump is operated and a given pressure of jet water is jetted from the nozzle 17 to separate concrete 5' which came into the back side of the pipe 2 and fixed to the wall of the hole 25 during the placement of concrete. The excess concrete can thus be removed out during a series of construction procedures of unit walls easily and exactly by means of jet water.