Reservoir evacuation and water storage method in emergency state of high dam of hydropower station

Abstract

The invention provides a reservoir evacuation and water storage method in an emergency state of a high dam of a hydropower station. The method comprises the following specific steps: (1) the water level of a reservoir is lowered to the lowest water level through a permanent flood discharge facility; (2) a water drainage channel with an arc door is built in an original blockage body of a guide tunnel; and a plug reserved section is arranged at the upstream of a plug; (3) permeated and accumulated water between the upstream and an inlet gate of the guide tunnel is emptied through a water drainage steel pipe of the original blockage body of the guide tunnel; (4) the plug reserved section at the upstream is blasted for removal to form a water discharge channel; (5) the arc door is closed; anda cavity between the arc door and the inlet gate of the guide tunnel is fully filled by the permeated water; (6) the inlet gate of the guide tunnel is lifted to communicate with the water discharge channel; (7) the arc door is opened to empty the reservoir; (8) the air door is closed for water storage again; and (9) a new blockage body is built to recover original functions of the reservoir. The method effectively reduces the water level of the reservoir under emergencies to conveniently deal with dangers so as to prevent or reduce the harm and the loss caused by accidents, and meanwhile, saves the construction period and reduces the investment.

Description

technical field [0001] The invention belongs to the technical field of water conservancy engineering construction, and in particular relates to a program method for emptying a reservoir and storing water again in an emergency. Background technique [0002] At present, in the hydropower stations and water conservancy projects built on the big rivers in the alpine and canyon areas of our country, the diversion method of bank diversion tunnels for flood discharge is generally used during the construction period of high dams and reservoirs. After the project is completed, the diversion tunnel will be blocked. In the middle and lower parts of the reservoir, there are no other flood discharge facilities that can empty the reservoir. [0003] The survey of the existing hydropower stations using tunnel diversion in my country shows that the concrete dams built in the early stage and most of the concrete face rockfill dam projects constructed in recent years have not specially set u...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problem that existing projects in distress after the initial water storage cannot discharge flood and then store water, the present invention provides a method for emptying and then storing water in the high dam of a hydropower station in an emergency state. The problem of emptying the reservoir, thereby avoiding or reducing the harm to the downstream, saving emptying time and reducing project investment, has significant economic and social benefits

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