| 摘要 |
PURPOSE:To prevent water from flowing out of the cut-separated edge of a concrete- placed piping and prevent the splashing of water and the springing-out of a cock body when the pushing back of the water in the concrete-placed piping is completed. CONSTITUTION:An inside-piping gate 11 is installed before the concrete placed edge of a concrete-placed piping 1, and a cock body 2 which is inserted from the base edge side of the piping by opening the gate is forcibly sent this side of the gate by the water pressure, and after the concrete in the piping is placed, the gate 11 is closed to stop the supply of water, and the piping is cut-separated from the concrete-placed edge side of the gate, and a water stop valve 32 is connected thereto. Then, water supply is restarted by opening the water stop valve 32 and the gate 11, and the cock body is forcibly sent to the concrete placing edge of the water stop valve, and immediately after discharging the concrete left in the piping, the water stop valve is closed. Then, an air feeding pipe is connected to the concrete placing edge side of the water stop valve, and a drain hose 53 is connected to the basic edge side of the piping, and then the water stop valve is opened, and an air vent valve is closed, and air is sent into the piping from the air feeding pipe, and the cock body is forcibly to the basic edge of the piping, and the water in the piping is drained through a drain hose. |
