| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a floating body type flap gate that blocks an overflow to a living space and an underground space in the beginning of inflow, and neither becomes hard to fall even when a water level decreases nor falls abruptly. <P>SOLUTION: There is provided a floating body type flap gate 11 which is installed at an opening part or gateway, and allows a door body 12 to have its tip swung and raised in a direction of flowing-in water (w) around its base end as a fulcrum in a plane in a height direction so as to block the opening part or gateway. A rod 13 is attached to a tip part of the door body 12. A wire rope 14 has one end attached to the rod 13 and the other end attached to a counterweight 20 through fixed pulleys 16, 17. The fixed pulley 16 is so installed that when the tilt angle θ of the door body 12 being raised or fallen down to a horizontal plane reaches 10-80°, the counterweight 20 is at a lowest point. Consequently, an overflow can be prevented in the beginning of inflow. Abrupt falling can be prevented before the falling is completed. Further, a shock at the time of the completion of the falling can be reduced and the water level is excellently followed up in the beginning of the falling. <P>COPYRIGHT: (C)2013,JPO&INPIT |
