Maintenance system of large-water-depth bucket type stilling pool and implementation method

Abstract

The invention belongs to the technical field of water conservancy and hydropower, and particularly relates to a maintenance system of a large-water-depth bucket type stilling pool and an implementation method. Compared with the prior art, a permanent water pumping and draining system and a maintenance cofferdam core wall structure are arranged, the top elevation of the maintenance cofferdam core wall is slightly higher than the sum of the lowest downstream tail water level and the wave climbing height, and a temporary filling cofferdam is omitted; the maintenance cofferdam core wall is positioned at the downstream tail end of the apron and is far away from the flood discharge and energy dissipation main flow area, the structural form of protecting rockfill on the two sides of the concretemaintenance cofferdam core wall is adopted, and reliability and durability are good; anti-seepage water stop materials are arranged between the two ends of the maintenance cofferdam core wall and therock slope and between the two ends of the maintenance cofferdam core wall and a guide wall between the plants and dams respectively, an anti-seepage curtain is arranged on the foundation of the maintenance cofferdam core wall, and the anti-seepage effect is good; a water pumping and draining system is arranged in the sand flushing bottom hole dam section and comprises a maintenance water collecting well, a water collecting well pump room and an embedded pipe communicating with the stilling bucket pool, water in the apron and the water collecting well, and arrangement and disassembly of temporary pumping and draining equipment are avoided.

Description

technical field [0001] The invention belongs to the technical field of water conservancy and hydropower, and in particular relates to a maintenance system and an implementation method of a large water deep stilling basin. Background technique [0002] For hydropower stations where the barrage is a concrete gravity dam and the powerhouse is behind the dam, the overflow dam section is generally arranged on one side of the river bed, the other side of the river bed is the dam section of the power plant, and there is a dam section of the bottom hole for flushing sand and a guide wall between the powerhouse and dam in the middle. . When the flood discharge energy dissipation structure adopts the bucket stilling basin, in order to ensure the energy dissipation effect of the bucket stilling basin, the downstream water depth is generally larger. For those submerged underwater, when the bucket stilling basin needs to be overhauled, the usual practice is: (1) close the overflow surfa...

AI Technical Summary

Problems solved by technology

However, when the downstream water depth and the width of the stilling sump are relatively large, the size of a flap door cannot be too large. It is necessary to set structural piers on the apron to support the flap door. Structural piers and flap doors are easily damaged and deformed, and have poor reliability. In addition, the metal structure of the flap door has been underwater for many years, and there are certain difficulties in self-repair and maintenance. Once it fails, it cannot be used normally

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