| 摘要 |
PURPOSE:To perform the stopping work of water at the same time as a pile is penetrated by a method in which when a water-permeable layer is reached, a filler is mixed into water jet, and the water jet is packed into the water permeable layer for water stopping. CONSTITUTION:Water in a mud water tank is supplied through a suction hose 2, a high-pressure pump 3, a jet pump 4, and a high-pressure hose 5 to an excavating nozzle 7 at the tip of a pile 6. A water suction hose 11 is lifted up to beneath the mud water surface of the tank 1 by a rope 12 and a vortex flow is formed on the water surface by suction. A fixed amount of a filler is charged from a hopper 13 into the center of the vortex flow, and the mud water is added to high-pressure water through a low-pressure suction hose 15 by utilizing a jet pumping action by means of the pump 4 and then packed into the permeable layer for water stopping. After the water stopping, the charging of the filler is stopped and the hose 11 is lowered, whereby permitting the driving of the pile and the water stopping of the water-permeable layer to be performed. |
