To provide an erection/fall-down gate capable of substantially reducing a manufacturing cost of a bag body by using an inexpensive low pressure resistance sheet at a part where pressure resistance strength can be low.
The erection/fall-down gate includes a door body 5 supported at a bottom part 2a of a water channel 2 and turnable between an erection position U on the upstream side and a fall-down position D on the downstream side, and a bag body 12 installed on the downstream side of the door body 5. The door body is turned to the erection position U by the expansion of the bag body 12 by the supply of fluid and the door body 5 is turned to the fall-down position D by the contraction of the bag body 12 by the supply of the fluid. For the bag body 12, a first part 12A in contact with the downstream side face of the door body 5 and a second part 12B in contact with the bottom part 2a of the water channel 2 are constituted of an airtight low pressure resistance sheet of the low pressure resistance strength, and the other third and fourth parts 12C and 12D are constituted of the airtight high pressure resistance sheet of the high pressure resistance strength.
MATSUOKA HARUHIKO
Masataka Otani
Yoshio Asano
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