| 摘要 |
PROBLEM TO BE SOLVED: To facilitate setting of an intake gate in an existing intake dam while minimizing installation costs thereof. SOLUTION: The intake gate 21 of the intake dam is set as follows. The intake dam includes a dam body 22, and an external cylinder 21a and an internal cylinder 21b disposed inside the external cylinder 21a are arranged on an impounding side of the dam body 22. Then, the internal cylinder 21b is rotated with respect to the external cylinder 21a, and therefore an opening 47 of the external cylinder 21a matches with an intake hole 50 of the internal cylinder 21b, to thereby open the intake gate 21. The intake gate 21 is formed of an intake unit 27 and a connecting unit 26 which are connected together. The intake unit 27 has an external cylinder section 41 having the opening 47 and an internal cylinder section 42 having the intake hole 50, and the latter is arranged inside the former. The connecting unit 26 has a connecting external cylinder 24 and connecting internal cylinder 25 which are connectable to the external and internal cylinder sections 41 and 42 of the intake unit 27, respectively. The thus formed intake gate 21 is arranged on the impounding side of the intake dam.
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