| 摘要 |
PROBLEM TO BE SOLVED: To mitigate a load on a wire rope connecting tips of door bodies.SOLUTION: A land-type floating body-type flap gate 11 includes a plurality of continuously installed door bodies 2 supported on a rear edge side and has a tip side that rises and swings. A wire rope 3 has one end fitted on a rear edge part of each of the door bodies 2, and a weight 5 fitted on the other end. Stationary pulleys 4a, 4b are disposed on the rear edge side of each of the door bodies 2 for guiding the wire rope 3, such that the weight 5 reaches the lowermost position midway while each of the door bodies 2 is rising or falling, thereby assisting rising or falling when rising or falling starts, at the same time functioning as a resistance against rising or falling before completion of rising or falling. Of the stationary pulleys 4a, 4b disposed on the rear edge side of each of the door bodies, height position of the stationary pulley 4a disposed adjacent to the rear edge part of the door body is made variable.EFFECT: A load on the wire rope that connects tips of the door bodies is mitigated, in view of influences of sliding resistance at a door stop on a side part and a difference in rising time when a tsunami strikes.SELECTED DRAWING: Figure 3 |
