A high dam and large reservoir ultra-deep water retaining and venting system and its operating method

Abstract

The invention discloses a high dam reservoir ultra-deep water retaining and emptying system and an operation method thereof. The water retaining and emptying system comprises first to last stage gate systems and a last stage radial gate system, and the first to last stage gate systems are sequentially arranged on a tunnel; each stage gate system is provided with communicating pipes with water supplement and draining functions, and the communicating pipes perform water flow control by means of valves; all the stages of gate systems achieve water pressure and air pressure balance through the inner and outer communicating pipes, the outer maintaining communicating pipes, ventilation pipes, galleries and the like of the gate systems respectively; the last stage gallery is communicated with the down stream of the water retaining and emptying system through a gallery shaft. The operation method includes four working conditions of water storing, water emptying, maintaining and water retaining. According to the high dam reservoir ultra-deep water retaining and emptying system and the operation method thereof, multiple stages of gates are disposed so as to share burden with a gross head; water filling is performed in rear of each stage of gate so as to counteract the pressure of water retaining heads, and hydraulic thrust which each stage of gate tolerates can be kept within a conventional design range; the defects of metal structures in the prior art can be overcome; the key technical problem of ultra-deep water retaining and emptying designs in the high dam reservoir engineering can be solved.

Description

technical field [0001] The invention belongs to the technical field of water conservancy and hydropower engineering, and in particular relates to an ultra-deep water retaining and venting system for high dams and large reservoirs and an operating method thereof. Background technique [0002] With the continuous development of dam construction technology, my country has put forward higher requirements for the venting scale and venting depth of high dams and large reservoirs in water conservancy and hydropower projects. However, according to the current level of gate system manufacturing technology in our country, the water retaining head of the gate is generally controlled within 120m. For a 300m-level high dam project, there is still nearly 180m deep reservoir water that cannot be emptied, which cannot meet the needs of safe operation of the project. . Under the current technical level, if the elevation of the water inlet of the vent facility is set too low, the gate will b...

AI Technical Summary

Problems solved by technology

[0004] (1) There is no maintenance gate in the above-mentioned graded water retaining structure. Once the water retaining gate fails, the gate cannot be lifted out for maintenance, and the operation durability of the entire gate system is insufficient, which may also lead to the failure of the entire system;

[0005] (2) Since there is no drainage measure to control the water level in the graded water retaining structure, the water body behind the gate that is higher than the control water level cannot be discharged in time, and the water head difference between the gates at all levels cannot be guaranteed, which will increase the water head of the gate system and cause The whole system crashes;

[0006] (3) There are no water filling and drainage pressure measures in the above-mentioned graded water retaining structure, so the water retaining gate cannot be opened and closed under rated water head difference and static water pressure;

[0007] (4) It is difficult to effectively ensure the safety of the system when the water level of the reservoir drops and the reverse thrust of the first gate occurs

[0008] In order to solve the water filling problem in the prior art, the Chinese patent with the publication number CN203256704U) discloses a hydraulic filling device for a plane gate. Outside the dam surface upstream of the planar gate, and must be lower than the dead water level, the pipe body passes through the gravity dam body and crosses the gate slot of the planar gate. Complete self-flow water filling alone cannot satisfy the complete filling of water body and flat pressure under various working conditions in the hole section between the plane gate and the arc gate

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