To provide a floating flap gate that requires an auxiliary force of a counterweight or the like, and in which bending does not occur in a forward end portion of a door body, even in cases in which an installation site has a wide span. A floating flap gate 1 having a forward end portion 2c of a door body 2 that is configured to rotate around a base end portion serving as a fulcrum at a time of a rising water, so as to float upwards, and provided with an upper beam 2d attached to the forward end portion 2c of the door body 2 and a door body suspension member 3 contained within the upper beam 2d, and having two ends each being connected to one end of a wire rope 4. A counterweight 5 is connected to the other end side of the wire rope 4 as a pulling device. Bolts 6b are used as adjusting members interposed between the upper beam 2d and the door suspension member 3, and are inserted into bolt holes 6a provided on an upper surface of the upper beam 2d, so as to exert an opposing force to the tension of the wire rope 4 resulting from the weight of the counterweight 5 acting on the door body suspension member 3, the opposing force being applied uniformly to the upper beam 2d during ordinary use.

A self-activating flood barrier includes a chamber (1) having first and second side walls (3, 5), a dam member (9) adapted to self-deploy in the event of a flood to inhibit the passage of water to a region to be protected, and a low-friction device (77, 79) positioned between the dam member and at least one of the first and second side walls of the chamber when the dam member is deployed. The low-friction device prevents jamming between the dam member and the at least one side wall.

A self-activating flood barrier includes a chamber (1) having first and second side walls (3, 5), a dam member (9) adapted to self-deploy in the event of a flood to inhibit the passage of water to a region to be protected, and a low-friction device (77, 79) positioned between the dam member and at least one of the first and second side walls of the chamber when the dam member is deployed. The low-friction device prevents jamming between the dam member and the at least one side wall.

The present invention relates to collapsible hoses and inflatable structures such as pneumatic actuators for water control gates that are manufactured on and incorporate into their structure a flexible internal mandrel with rounded edges. One face of the mandrel and all of its rounded edges separate from the inflatable membrane during pressurization, while the remaining face of the flexible mandrel remains bonded to the remaining face of the inflatable envelope. Sharp internal edges (in the deflated condition) and their associated stress concentrations (in the inflated condition) are thus eliminated.

The present invention relates to inflatable bladder actuated water control gates for control of open channels such as rivers and canals and for control of dam spillways without the need for intermediate piers. The air bladder and hinge flap wedge clamping system includes hinged engagement of the upstream edge of the clamps to the foundation so as to prevent the application of bending and shear loads to the anchor bolts. The resulting configuration facilitates the use of high strength alloy steel anchor bolts in a corrosion protected environment and also prevents tensile loading of the concrete foundation and associated cracking of the concrete foundation.

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.

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.

An open breakwater dike system comprising a dike body, anchor feet, wherein the anchor feet are connected to or integral with a bottom surface of the dike body; and a first pillar connected to or integral with an upper surface of the dike body is disclosed. In an embodiment, the open dike system further comprises a second pillar connected to or integral with the upper surface of the dike body offset from the first pillar; a first flap gate rotationally attached to the first pillar and disposed between the first and second pillars, wherein the first flap gate closes against a first extension in the second pillar; and a means for opening and closing one or more flap gates, wherein the means for opening one or more flap gates opens and closes the first flap gate. A method of using the open breakwater dike system is also disclosed.

To provide a floating flap gate that requires an auxiliary force of a counterweight or the like, and in which bending does not occur in a forward end portion of a door body, even in cases in which an installation site has a wide span. A floating flap gate 1 having a forward end portion 2c of a door body 2 that is configured to rotate around a base end portion serving as a fulcrum at a time of a rising water, so as to float upwards, and provided with an upper beam 2d attached to the forward end portion 2c of the door body 2 and a door body suspension member 3 contained within the upper beam 2d, and having two ends each being connected to one end of a wire rope 4. A counterweight 5 is connected to the other end side of the wire rope 4 as a pulling device. Bolts 6b are used as adjusting members interposed between the upper beam 2d and the door suspension member 3, and are inserted into bolt holes 6a provided on an upper surface of the upper beam 2d, so as to exert an opposing force to the tension of the wire rope 4 resulting from the weight of the counterweight 5 acting on the door body suspension member 3, the opposing force being applied uniformly to the upper beam 2d during ordinary use.

The present invention discloses improved means of venting bottom hinged water control gates through the abutments over a wide range of tailwater elevations while minimizing the hazard of trapping water born debris in the abutment vents. A single pipe, or a plurality of pipes, may be provided. Check valves may be provided to exclude water borne trash.