Watertight structure for flap gate and flap gate comprising same
AssigneeASAHI INOVEX Corp.
InventorsTetsuo Onodera, Koji Sasayama, Toshio Tsuchiya
Life of this patent
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Abstract
A watertight structure in a flap gate 1 provided with a weight-balance supported door 2 to open an opening 200 of a floodgate 100 in a state in which no external force other than gravity is applied, wherein the structure has: a gap opening-closing member 72 that oscillates in the water flow direction and opens and closes a gap C, wherein the gap C is provided between the lower edge 23 of the door 2 and the bottom face 300 of the floodgate 100 in a state in which the door 2 is blocking the floodgate 100; and an opening operation assist means 73 for operating the gap opening-closing member 72 so as to be in an open state by lifting same toward the outer water side.
Claims8
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.
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;
- and
- 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, wherein
- the opening operation assist means includes an assist arm that is fixed to a lower surface of the gap opening-closing member and that extends to an inner water side relative to the gap opening-closing member, and an open state holding weight that is disposed at an inner water-side end portion of the assist arm and that brings the gap opening-closing member into the open state by lifting up the gap opening-closing member to the outer water side via a weight balance.
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;
- and
- 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, wherein
- the opening operation assist means includes a lifting weight capable of moving upward and downward, and a lift-up operation section that operates the gap opening-closing member into the open state by lifting up the gap opening-closing member to the outer water side via a direction conversion mechanism that converts tension in a gravity direction generated by self-weight of the lifting weight into a force in a lift-up direction.
Dependencies are inferred from the claim text.