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 2COPYRIGHT: (C)2016,JPO&INPIT【課題】 装置内に異物が堆積することがなく、地中水の安定した排水/止水操作が可能な排水弁操作装置を提供することにある。【解決手段】 排水弁操作装置1は、ホール水甲20が上流側の継手管10に接続する連通接続部21と、下流側の継手管15に接続する連通接続部23と、ホール水甲20の上部に設けられる立ち上り管4に接続する立ち上り管接続部32とからなり、ホール水甲20内で、各連通接続部21,23と立ち上り管接続部32とが直交する箇所には、立ち上がり管接続部32の下方で上流側の連通接続部21と下流側の連通接続部23との間を閉塞する閉塞板33が傾斜した状態で設けられ、その閉塞板33には流下孔29が穿設されており、下降した弁体5が流下孔29に挿嵌されることで止水する。【選択図】図2
