To provide a derricking gate for preventing intrusion of flowing water, which remarkably improves reliability of a derricking motion by a non-powered system, and which dispenses with an increase in pressure resistance of a lateral watertight membrane and strength of fixing a door body and a flowing water channel.
In a derricking gate for preventing intrusion of flowing water, a door body 2 generating buoyancy in water is supported on a bottom 3a of a flowing water channel 3 in such a manner as to be freely raised/brought down via a hinge member (lower water sealing rubber plate) 8. A lateral watertight membrane 16, which is disposed in a region of a small gap S between each of both side portions of the door body 2 and each of both side portions 3b of the flowing water channel 3, is spontaneously folded back following the derricking motion of the door body 3, so as to be stretched in the state of having an inner surface 16c directed inward along each of the both side portions of the flowing water channel 3 when the door body 2 is brought down and so as to be stretched in the state of having an outer surface 16d directed inward along each of the both side portions 3b of the flowing water channel 3 when the door body 2 is erected.
MATSUOKA HARUHIKO
Masataka Otani
Yoshio Asano
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