CONSTITUTION: In a water intake system (10), an internal conduit (22) is laid in an underground tunnel (18) of a dam body (12), and water of a pool (14) is allowed to pass through an intake float (28), an intake hose (26), and a connection conduit (24) to be introduced to the internal conduit (22) in the tunnel. To an exit of the internal conduit (22) in the tunnel, a discharge conduit (44) is connected. A gate valve (58) is provided to the discharge conduit (44), and to a position higher than the gate valve (58), a discharge port (48) is formed via an inclined part (60). When the gate valve (58) is opened, water of the pool (14) flows into the internal conduit (22) in the tunnel, and through the discharge conduit (44), is discharged into a water-discharge pit (20) from the discharge port (48). When the gate valve (58) is closed, sealing water is formed between the discharge port (48) and the gate valve (58).EFFECT: According to the present invention, provided is a water intake system which has a simpler structure than that of siphon-type system, facilitates management, and further can prevent air contamination by sealing water.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2016,JPO&INPIT【構成】 取水システム(10)は、堤体(12)の地下の隧道(18)内に、隧道内管路(22)を敷設し、取水フロート(28)、取水ホース(26)、接続管路(24)を通して溜め池(14)の水を隧道内管路(22)に導入する。隧道内管路(22)の出口に吐出管路44を接続する。吐出管路44には仕切弁58を設け、傾斜部60を介して、仕切弁58より高位の位置に吐出口48を形成する。仕切弁58を開くと、溜め池(14)の水は、隧道内管路(22)に流入し、吐出管路44を経て吐出口48から放水ピット20中へ放水される。仕切弁58を閉めれば、吐出口48と仕切弁58との間に封水が形成される。 【効果】 サイホン方式に比べて構造が簡単で、管理が容易である。しかも、封水によって空気の混入が防止できる。【選択図】 図3
