| 摘要 |
PROBLEM TO BE SOLVED: To provide a sand pumping apparatus for a hydraulic power plant avoiding blocking of an intake and a water conveyance port with silted deposition in a sand pumping facility combining an air mixing type jet pump with a vortex sand discharge pipe. SOLUTION: In this sand pumping apparatus for a hydraulic power plant for eliminating the silted deposition deposited in an intake sand basin, a first and a fourth vortex sand discharge pipes 21, 24 are installed in a position of a distance d1 expressed in the following expression, along a water flow direction from a position when the silted deposition of maximum allowable height of the intake side wall of the intake sand basin is deposited: d1=(H1-h1)/tan(θ), wherein H1 is the maximum allowable height of the silted deposition from a bottom part of the intake sand basin on the intake side of the intake sand basin, h1 is the slit height of the vortex sand discharge pipes 21, 24 on the first and fourth intake side from the bottom part of the intake sand basin, andθis an underwater angle of repose. COPYRIGHT: (C)2005,JPO&NCIPI
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