| 摘要 |
PURPOSE:To easily and quickly construct a tower type fishway by a method in which plural unit blocks having inner and outer side walls, upper and down- stream side partition walls, and bottom walls are connected with one another in such a way that a spirally staged waterway is formed around a vertical axis. CONSTITUTION:Inlet blocks 20 and plural unit blocks 1 are orderly connected with one another by approaching the inlet 24 of a fishway to the river bed as closely as possible on a foundation 37. the unit blocks 1 at the lowest stage are supported by a regulating concrete 38 and the inlet blocks 20, and also the unit blocks 1 of the following stages are connected with respective lower stage unit blocks 1 and supported so as to form a spirally staged fishway around a vertical axis. Then, a bridge 26 is connected to the final unit block 1 and the subordinate unit block 1 and then to a dam 36, the opening 39 provided in the dam 36 is led to the inside of the bridge 26, and a recession is artificially formed on the front stage of the fishway inlet 24 of the inlet blocks 20. |
