US 12,221,757 B2
Watertight structure for flap gate and flap gate comprising same
Tetsuo Onodera, Sapporo (JP); Koji Sasayama, Sapporo (JP); and Toshio Tsuchiya, Sapporo (JP)
Assigned to ASAHI INOVEX Corp., Sapporo (JP)
Appl. No. 17/441,286
Filed by ASAHI INOVEX Corp., Sapporo (JP)
PCT Filed Mar. 19, 2020, PCT No. PCT/JP2020/012367
§ 371(c)(1), (2) Date Sep. 21, 2021,
PCT Pub. No. WO2020/196290, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 2019-055243 (JP), filed on Mar. 22, 2019.
Prior Publication US 2022/0145562 A1, May 12, 2022
Int. Cl. E02B 7/44 (2006.01); E02B 7/40 (2006.01)
CPC E02B 7/44 (2013.01) 8 Claims
OG exemplary drawing
 
1. A watertight structure for a flap gate including a door, the door being supported in a weight balance in which the door opens an opening portion of a floodgate in a state in which no external force other than gravity is applied, the watertight structure comprising:
a gap opening-closing member that provides a gap between a lower edge of the door and a bottom face of the floodgate in a state in which the door closes the floodgate, and opens and closes the gap by swinging in a water flow direction;
opening operation assist means for operating the gap opening-closing member into an open state by lifting up the gap opening-closing member to an outer water side; and
closing operation assist means for operating the gap opening-closing member held in the open state into a closed state by buoyancy generated when submerged in water.