| 摘要 |
To make it possible to hold a door body in an immobilized state without oscillating when the raising operation has been completed. A raised state holding mechanism 21 of a flap gate 11 for a breakwater provided with a two-folding support rod 13 which immobilizes and supports a door body 12 the front end side of which is supported to freely rise or lower with a rotating shaft 12a as a supporting point, and a stay 17 which supports this and to which is attached a guide roller 17c the movement of which is guided by a guide rail 18. Between a two-rod double-acting cylinder device 22 and an oil tank 32 there is a raising side oil supply pathway 29 which supplies oil to a raising side oil chamber 22d, a raising side oil discharge pathway 34; which discharges oil from the raising side oil chamber 22d, and a lowering side oil pathway 37 which supplies/discharges oil to a lowering side oil chamber 22e. A check valve 33 is provided to the raising side oil supply pathway 29, and a shut-off valve 35 is provided to the raising side oil discharge pathway 34 to prevent lowering of the door body 12 during the operation of raising the door body and after raising of the door body is completed. It becomes possible to hold a door body in an immobilized state without oscillating when the raising operation has been completed.
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