Maintenance method and dam structure for low gate dam accident gate

Abstract

The invention discloses a method for overhauling a low-dam accident gate and a gate dam structure. In the method, a hydraulic oil cylinder is used as a device for lifting the accident gate. The lower section of the hydraulic oil cylinder extends into the gate dam, and the middle part is connected with a base fixed on the dam surface , the length of the upper part of the hydraulic cylinder protruding from the dam surface is less than the height limit of the door operator, so there is no need to modify the existing door operator; the bottom of the hydraulic cylinder is connected to the emergency gate through the pull rod, and the emergency gate is lifted to the inspection cavity in the dam body through the hydraulic cylinder , and the upper and lower ends of the emergency gate are respectively fixed to the upper and lower locking platforms in the inspection cavity through the locking beam, and the inspection and repair of the emergency gate is completed in the inspection cavity. The invention reduces the height limit requirement of the door operator, does not need to modify the existing door operator, improves the maintenance efficiency, reduces the maintenance cost, and improves the sealing effect of the emergency gate.

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 hoist. [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

Images