| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a hydraulic type opening/closing device of a tide gate, capable of automatically performing full closing/full opening of the tide gate even when operation of a change-over valve or driving of a hydraulic pump cannot be carried out due to an interruption of commercial power supply or the like.SOLUTION: In a hydraulic type opening/closing device, a tide gate 1 attached to an opening of a coastal dyke 2 or the like is opened or closed by hydraulic cylinders 4A, 4B. An operation type change-over valve 16 is provided in a hydraulic circuit of each of the hydraulic cylinders 4A, 4B. There are an accumulator 22 for accumulating hydraulic pressure, a float type change-over valve 23, and a shuttle valve 24. At a neutral position of the operation type change-over valve 16, immersion of a tsunami is blocked by supplying the hydraulic pressure of the accumulator 22 to a forward movement side of each of the hydraulic cylinders 4A, 4B to close the tide gate 1, while inner water is eliminated by returning the hydraulic pressure of the hydraulic cylinders 4A, 4B to an oil tank 19 by inner water pressure to open the tide gate 1.</p> |
