| 摘要 |
PROBLEM TO BE SOLVED: To provide a drain valve operation device which allows stable water discharging and stopping operation of underground water without accumulation of a foreign material in the device.SOLUTION: A drain valve operation device 1 comprises a communication connection part 21 in which a hole lock gate 20 is connected with a joint pipe 10 on the upstream side, a communication connection part 23 in which the hole lock gate is connected with a joint pipe 15 on the downstream side, and a rising-up pipe connection part 32 in which the hole lock gate is connected with a rising-up pipe 4 installed at the upper part of the hole lock gate 20. In the hole lock gate 20, a closing plate 33 for blocking the space between the communication connection part 21 on the upstream side and the communication connection part 23 on the downstream side below the rising-up pipe connection part 32 is installed in an inclined state at a place where each of the communication connection parts 21 and 23 and the rising-up pipe connection part 32 crosses orthogonally, and a downflow hole 29 is bored in the closing plate 33 and a dropped valve body 5 is inserted into the downflow hole 29 for water stopping.SELECTED DRAWING: Figure 2 |
