Multi-stage water retaining and emptying system for high dam engineering

Abstract

The invention discloses a multi-stage water retaining and emptying system for high dam engineering. The system comprises a water retaining unit and a water discharging unit which are arranged in sequence along the water flow direction in a tunnel, wherein the water retaining unit is formed by n stages of water retaining gate devices which are arranged at an appropriate spacing; the water discharging unit comprises an accident gate device and a water discharge gate device; and the n stages of water retaining gate devices of the water retaining unit respectively comprise maintenance gate wells and working gate wells which are arranged side by side in the tunnel; flat pressure pipes are arranged side by side at the outer sides of all the gate wells and are respectively communicated with all the maintenance gate wells and the working gate wells; the height, relative to the bottom of the tunnel, of the flat pressure pipe is lower than the water level in the last gate well. By adopting the technical scheme, the water levels in the gate wells are gradually reduced, and the relative water pressure of all the water retaining gate devices is kept stable, so that the resultant force applied to a gate is within the maximum range that the metal structure can bear, and the ability to empty to any depth is achieved; furthermore, due to arrangement of devices such as a blowdown pipe and a water overflow corridor, the safe operation of the emptying system is guaranteed.

Description

technical field [0001] The invention specifically relates to the technical field of water conservancy and hydropower engineering, in particular to a multi-stage water retaining and venting system used in high dam projects. Background technique [0002] The high dam project has brought huge energy benefits to my country's economic and social development, and the venting technology of the project is an important guarantee for its stable and safe operation. However, at present, most 300m-level high dam projects can only be vented to a water depth of about 105m through spillways, spillway tunnels, and vent holes. Therefore, it is necessary to invent a technology suitable for deeper venting to meet the venting operation requirements of today's high dam projects. [0003] In order to meet the operation requirements of the 300m-level high dam project, the Chinese patent with publication number CN105220659B discloses a high dam reservoir ultra-deep water retaining venting system an...

AI Technical Summary

Problems solved by technology

By setting up multi-level gates to share the total water head, and filling water behind the gates at all levels to offset the water retaining head, the water thrust of the gates at all levels is within the conventional design range, which overcomes the existing technical problems of metal structures, but the structure is still There are the following deficiencies: the ventilation pipe is set outside the gate well, which increases the difficulty of construction; the installation of pressure-leveling pipes, air supply pipes, and water-filling pipes is complicated, and some of them lack backup facilities, which may lead to the failure of system leveling; the gate systems at all levels are shared equally by water head , the head gate only shares part of the water head, which increases the number of gate wells and the construction period

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