Construction method of diversion tunnel plugging of hydropower station based on karst landform

Abstract

The present invention provides a construction method for plugging diversion tunnels of hydropower stations based on karst landforms, which includes the following steps: S1: Designing a diversion tunnel plugging scheme, formulating the principle of mainly blocking inside the tunnel and supplemented by anti-seepage outside the tunnel, The plugging scheme of temporary plug and permanent plug; S2: Temporary plug construction of diversion tunnel: S21: Construction of construction channel and scaffolding platform; S22: Installation of water-retaining steel plate gate; S23: Installation of stacked beam door; S24 : Make and install the drainage steel pipe; S25: Pour the concrete of the first section of the temporary plug; S26: grouting plugging and reinforcement of the first section of the temporary plug; S27: Close the butterfly valve; S28: Pour the concrete of the second section of the temporary plug ; S3: Construction of permanent plug. By adopting the above-mentioned construction method for blocking the diversion tunnel of the hydropower station, the blocking of the diversion tunnel can be effectively ensured, thereby ensuring the safety of the dam.

Description

technical field [0001] The invention belongs to the technical field of hydraulic engineering construction, and in particular relates to a construction method for plugging diversion tunnels of hydropower stations based on karst landforms. Background technique [0002] The dam site of the Wanjiakouzi Hydropower Station is located on the Gexiang River in the upper reaches of the main stream of the Beipan River. It is the fourth level of hydropower development on the main stream of the Beipan River. The scale of the project is large (2), mainly for power generation. The main buildings are: rolling Concrete arch dam, dam crest overflow surface hole, energy dissipation pad pond, dam body flushing sand hole, water diversion system, ground powerhouse and switch station, etc. [0003] The normal storage level of the reservoir is 1450 m, the dam crest elevation is 1452.50 m, and the maximum dam height is 167.5 m. It is the highest RCC hyperbolic arch dam currently under construction. ...

AI Technical Summary

Problems solved by technology

The water in the diversion tunnel is deep and fast, the construction surface is narrow, and there are major safety hazards in the plugging. At the same time, there are many construction problems such as material transportation, temporary drainage, concrete pouring, and the stability of the plug structure. The plugging is extremely difficult.

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