"Mechanism For Maintaining Upright State Of Breakwater Flap Gate"

Abstract: It is made possible for a door body to be held in a fixed state without shaking after the door body is positioned upright. A mechanism (21) for maintaining an upright state of a breakwater flap gate (11) is provided, the breakwater flap gate (11) comprising: a bi-fold support rod (13) for fixedly supporting the door body (12) that is supported in a state in which a rotary shaft (12a) at the base end-side serves as a support point and the tip end-side can be positioned upright or collapsed; and a guide rail (18) for guiding the movement of a guide roller (17c) attached to a stay (17) that supports the bi-fold support rod (13). The mechanism (21) has, between an oil tank (32) and a double-rod type double-acting cylinder device (22), an upright-side oil supply path (29) for supplying oil to an upright-side oil chamber (22d), an upright-side oil discharge path (34) for discharging oil from the upright-side oil chamber (22d), and a collapsed-side oil path (37) for supplying and discharging oil to and from a collapsed-side oil chamber (22e). A shutoff valve (35) is provided in the upright-side side oil discharge path (34) together with a check valve (33) being provided in the upright-side oil supply path (29), so as to prevent the door body (12) from collapsing when the door body (12) is being positioned upright and after the door body (12) is positioned upright. The door body can therefore be maintained in a fixed state without shaking after being positioned upright.

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