A compound sand-retaining wall capable of forming longitudinal spiral flow to retain and discharge sand

Abstract

The invention provides a compound sand-blocking wall capable of forming longitudinal spiral flow for sand-blocking and sand-discharging. angle. The invention can effectively intercept the drifting sediment, and the water flow can form a spiral flow outside the sand-blocking wall to start and transport the deposited drifting sediment downstream, preventing the drifting head from approaching the sand-blocking wall. It is economical and efficient without additional sand removal measures. The problem of sand retention and sand discharge of the low-head diversion hydropower station is effectively solved.

Description

technical field [0001] The invention belongs to the technical field of sand-blocking and sand-discharging in water conservancy and hydropower irrigation and water diversion projects, and in particular relates to a compound sand-blocking wall capable of forming longitudinal spiral flow for sand-blocking and sand-discharging. Background technique [0002] In water conservancy irrigation, water intake projects or water diversion projects for hydropower generation, the problem of water intake and sand control often determines the success or failure of the project. For a long time, relevant foreign and domestic experts have carried out in-depth research on scientific, feasible and economical sand retention and sand removal measures, such as artificial bend type, bottom grid type, layered type and other water intake and sand discharge facilities, curved sand sedimentation Pools and other types of sand sinking facilities. [0003] Kolesnikov of the former Soviet Union designed the...

AI Technical Summary

Problems solved by technology

However, when the amount of sand carried by the incoming flow is large, the following two prominent problems are often encountered: (1) The newly-built sand retaining wall has a better effect of retaining sand, but after a period of operation, the mass will gradually submerge the sand retaining wall, causing The sand-blocking efficiency of the sand-blocking wall is reduced. In severe cases, the sand-blocking wall will be completely submerged, making it useless, and a large amount of sand will enter the water intake

During the operation period of a hydropower station in Yunnan Province from 2008 to 2010, because the anti-sand flushing measures arranged in front of the water intake of the first hub did not achieve the preset effect, the front pool of the water intake and the reservoir section in front of the sluice were seriously silted up. Even manual dredging before the water intake gate is far from guaranteeing normal water intake for power generation

(2) Even if the distance between the moving mass and the sand-blocking wall is controlled by opening the sand discharge, some coarse particles will still be carried by the water flow into the water intake, that is, the sand-blocking efficiency needs to be improved

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