Flat pressure pipe for step-by-step water retaining and emptying system of high dam

Abstract

The invention discloses a flat pressure pipe for a step-by-step water retaining and emptying system of a high dam. The flat pressure pipe comprises a main pipe. The step-by-step water retaining and emptying system of the high dam is arranged inside a river channel. The step-by-step water retaining and emptying system of the high dam comprises a water retaining unit and an evacuation gate device. The water retaining unit is composed of n-step water retaining gate devices arranged in parallel at appropriate intervals. Each water retaining gate device includes an overhaul gate well and a workinggate well. The evacuation gate device comprises an accident gate device and a drainage gate device. The main pipe communicates with each step of overhaul gate well through a first branch pipe and communicates with each step of working gate well through a second branch pipe. According to the technical scheme of the flat pressure pipe for the step-by-step water retaining and emptying system of the high dam, the head pressure difference of each step of water retaining gate device can be adjusted conveniently by the mutual communication of each step of water retaining gate device inside the step-by-step water retaining and emptying system of the high dam, so that the excess of the head pressure in the system is avoided, the situation that each step of water retaining gate device bears the stable water pressure difference is ensured, and thus the operation safety of the step-by-step water retaining and emptying system of the high dam is ensured.

Description

technical field [0001] The invention belongs to the technical field of water conservancy and hydropower engineering, and in particular relates to a flat pressure pipe used in a step-by-step water retaining and emptying system of a high dam. Background technique [0002] As the height of hydropower dams increases, the requirements for project safety are getting higher and higher, which requires the reservoir water to be emptied to a sufficient depth to better provide maintenance conditions for the dam and greatly ensure project safety. At present, there is a venting system that uses multi-level gates to share the total water head to vent the dam to any depth. The Chinese invention patent with the publication number CN105220659B discloses an ultra-deep water retaining and venting system for a high dam reservoir and an operation method thereof. The technical solution overcomes the existing technical problems and meets the venting requirements of the existing high dams. The ba...

AI Technical Summary

Problems solved by technology

However, this structure still has the following disadvantages: the inner flat pressure pipe in the system is set in the parapet of the gate well, and the operation and maintenance remain unchanged, and there are two outer flat pressure pipes, the pipeline is complicated and difficult to manage

This structure is very easy to cause the entire system to be poorly filled with water due to the failure of the inner flat pressure tube, which endangers the safety of the structure

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