Watertight structure for flap gate and flap gate equipped with this

摘要

PROBLEM TO BE SOLVED: To obtain a large gap between a door body and a bottom surface of a water gate opening without providing a step in a floor in a state where an external force other than gravity is not applied, and to have watertightness with the water gate opening when closed. A watertight structure for a flap gate and a flap gate provided with the watertight structure can be provided. SOLUTION: This is a watertight structure in a flap gate 1 provided with a door body 2 supported by a weight balance that opens an opening 200 of a floodgate 100 in a state where no external force other than gravity is applied, and the door body 2 is In a state where the water gate 100 is closed, a gap C is provided between the lower end edge 23 of the door body 2 and the bottom surface 300 of the water gate 100, and a gap opening / closing member 72 that swings in the flowing water direction to open / close the gap C is provided. Have. [Selection diagram] Fig. 1