| 摘要 |
PROBLEM TO BE SOLVED: To provide an erecting/falling gate capable of moving according to water level without attendance of an operator, dispenses with a drive unit such as a hydraulic cylinder, hydraulic equipment such as an oil pressure generating device, electric control equipment such as a control panel, and an operating chamber for protecting the electric control equipment etc., and saving a large amount of costs required for setting and maintenance of the equipment. SOLUTION: A door body 2 has a vent hole 2b and an intake port 2c at an upper portion thereof, and a drain port 2d which is smaller in a cross section than the intake port 2c, at a lower end thereof, and is formed into a hollow sealed structure 2e. Then the lower portion of the door body 2 is rotatably fixed to a bearing portion 3 in a bottom surface of the water-intake weir 1 which has an engaging portion 5 for engaging with the erected door body 2. Thus the door body 2 is automatically erected without power until water in the water-intake weir 1 reaches a predetermined water level, to thereby stop the inflow of water from the water-intake weir 1 to a drainage station 4. On the other hand when water in the weir 1 exceeds the predetermined water level, the erected door body 2 is made to automatically fall and submerged in the water without power, to thereby water is made to flow from the water-intake weir 1 to the station 4. COPYRIGHT: (C)2004,JPO&NCIPI
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