| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a flap gate that smoothly discharges water when an upstream-side water level is low or when a large amount of water is discharged, and prevents water from flowing back when a river-side water level and a sluice pipe-side water level is substantially as high as each other. <P>SOLUTION: There is provided the flap gate such that a door body 1 to be freely opened and closed is installed at a river-side exit of a sluice pipe provided to a river bank etc., while suspended by an upper hinge mechanism to cutoff water flowing from the river side, and rotates to a river direction to open the sluice pipe for water flowing from the sluice pipe side, the flip gate being characterized in that a float structure part 1e which generates buoyance is formed at a lower part of the door body 1, a balance weight which moves the position W of the center of gravity of the door body in a downstream direction of the flap gate is installed at an upper part of the door body 1, and the position W of the center of gravity of the door body 1 and the position of a suspension core suspending the door body 1 are arranged downstream from a perpendicular line V2 passing the center of buoyance of the float structure part. <P>COPYRIGHT: (C)2013,JPO&INPIT |
