Maintenance method for emergency gate of low-head gate dam and gate dam structure

Abstract

The invention discloses a maintenance method for an emergency gate of a low-head gate dam and a gate dam structure. According to the maintenance method for the emergency gate of the low-head gate dam, a hydraulic oil cylinder is used as a device for lifting the emergency gate, the lower section of the hydraulic oil cylinder extends into the gate dam, the middle portion of the hydraulic oil cylinder is connected with a base fixed to a dam face, the length of the portion, extending out of the dam face, of the upper section of the hydraulic oil cylinder is smaller than the height limit of a portal crane, and an existing portal crane does not need to the reformed; the bottom of the hydraulic oil cylinder is connected with the emergency gate through a pull rod, the emergency gate is lifted to a maintenance cavity in a dam body through the hydraulic oil cylinder, the upper end and the lower end of the emergency gate are fixed to an upper locking platform in the maintenance cavity and a lower locking platform in the maintenance cavity respectively through a locking beam, and the emergency gate is maintained in the maintenance cavity. By the adoption of the maintenance method for the emergency gate of the low-head gate dam and the gate dam structure, the requirement for the height limit of the portal crane is lowered, the existing portal crane does not need to be reformed, the maintenance efficiency is improved, the maintenance cost is reduced, and the sealing effect of the emergency gate is improved.

Description

technical field [0001] The invention relates to a method for overhauling an accidental gate of a low dam and a dam structure, and belongs to the technical field of overhauling an accidental gate of a low-head dam in a hydropower project. Background technique [0002] The gates commonly used in hydropower stations can be divided into working gates, maintenance gates and emergency gates according to the nature of their work. The maintenance gate is located upstream of the working gate, and the emergency gate is located between the working gate and the maintenance gate. The function of the emergency gate is a gate that can be closed in moving water when an accident occurs to the generator set downstream of the gate. When it needs to be closed quickly, it is called a fast emergency gate. In gates and dams without fast closing requirements, the opening and closing of the emergency gate is usually operated by a fixed winch. [0003] For the low-head gate dam generating unit pow...

AI Technical Summary

Problems solved by technology

Due to the small difference between the dead water level of the low gate dam generator unit and the normal water storage level, the height of the gate dam is also relatively low, resulting in a short distance from the maintenance platform to the dam surface

If the emergency gate is to be fully raised to the dam surface for maintenance, the height of the existing gantry crane on the dam surface is not high enough. If the height of the gantry crane is to be increased, the design and manufacture of the gantry crane will inevitably be more difficult and the investment will be larger

In addition, the steel bent frame and fixed hoist above the dam surface need to be dismantled for each maintenance, and the steel bent frame and fixed hoist need to be reinstalled after the maintenance is completed. The maintenance process is very troublesome

Therefore, the gate and dam structure in the prior art is still not ideal enough

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