| 摘要 |
PROBLEM TO BE SOLVED: To provide a construction method and a device for removing sediment on a bottom of a dam lake, which allows the sediment to be efficiently removed from the dam and can greatly reduce the cost of removal of the sediment. SOLUTION: Bifurcated piping (3) is arranged in the dam lake (2); an end (3ae) of one branch pipe (3a) is arranged in the vicinity (including the inside of a layer of the sediment 2a) of a bottom part (2c) of the dam lake (2); an end (3be) of the other branch pipe (3b) is arranged above the sediment (2a); piping (3c), into which the two branch pipes (3a and 3b) are merged, goes over the dam (1) (for example, straddles a top part 1a of the dam 1 or is arranged through a through-hole 1b provided in the dam 1), so as to be extended to a downstream side (1c); the sediment (2a) is sucked in from the end (3ae); water (2b) is sucked in from the branch pipe (3b); and a solid-liquid two-phase flow (2ab), which is composed of the sediment (2a) and the water (2b), flows through the piping (3c).
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