Repairing method for surface cavitation damage of hydropower station water retaining dam sand washing bottom hole working gate

Abstract

The invention discloses a repairing method for surface cavitation damage of a hydropower station water retaining dam sand washing bottom hole working gate. A material A made of epoxy resin and a curing agent and a material B made of NE-II type granulated sand are involved, the cavitation damage portion of a gate leaf is coated with the material A and then coated with the material B after being baked, and after the steps are completed, and the treated cavitation damage portion is naturally cured until a coating is thoroughly cured. The method is tried out on a steel lining of a hydropower station sand washing bottom hole side wall, after being subjected to high-speed silt-carrying water flow scour during the flood season for three years, the surface of the coating is still flat, and the coating is high in integrity and high in degree of adhesion to the surface of a metal structure and effectively prevent cavitation damage to the surface of the metal structure in a hydropower station. Compared with the prior art, the repairing method is low in technical requirement, simple in process, low in cost and worthy of popularization, and time consumption is reduced.

Description

technical field [0001] The invention relates to a working door for a sand-washing bottom hole of a hydropower station retaining dam, in particular to a method for reinforcing and repairing cavitation on the surface of the door. Background technique [0002] The working door of the sand flushing bottom hole of the dam of the hydropower station is a steel structure. The door leaf is immersed in water for a long time and is eroded by high-speed water flow, sediment, ice and other aquatic organisms. The steel is easily corroded, which reduces the bearing capacity of the door leaf. Affecting the safety of water conservancy projects requires a lot of manpower, material and financial resources to carry out anti-corrosion work. At present, the cavitation repair of the working door mainly adopts the method of surfacing and grinding. In the process of large-scale repair, the problem of welding stress needs to be solved. The welding technology requires high requirements, high cost, lab...

AI Technical Summary

Problems solved by technology

[0002] The working door of the sand-washing bottom hole of the dam of the hydropower station is a steel structure. The door leaf is submerged underwater for a long time, and is eroded by high-speed water flow, sediment, ice and other aquatic organisms. The steel is easy to corrode, which reduces the bearing capacity of the door leaf. Serious Affecting the safety of water conservancy projects requires a lot of manpower, material and financial resources to carry out anti-corrosion work

At present, the cavitation repair of the working door mainly adopts the method of surfacing welding and grinding. In the process of large-area repairing, the problem of welding stress needs to be solved. difficult to control

[0003] There are also existing methods such as spot welding and other melting welding methods (application number 201210253438.1) on the metal surface to weld and fix the steel wire mesh and the base metal surface, and then coat the steel mesh with epoxy resin to obtain a steel mesh epoxy resin coating. This method makes the resin coating not easy to fall off, and the bonding strength is high, but the actual operation of this method is troublesome, the technical difficulty is high, and the process requirements are high