Cable Bridge Surface Anticorrosive Layer Type Selection

The third common problem in engineering design is that the cable bridge model does not mark the category of anti-corrosion layer, and there is no unified text description. This problem has a lesson in reality, such as a project in Indonesia that our country undertakes the general contract, the surface corrosion treatment of steel cable tray is not salt spray test, and the bridge corroded very seriously soon after completion and had to be replaced. The surface anti-corrosion layer of cable bridge mainly includes hot dipping zinc, galvanized nickel, cold galvanizing, powder electrostatic spraying, etc. According to the manufacturer's data, the process life of hot dipping zinc is not less than 40 years, which is suitable for outdoor heavy corrosion environment and has high cost. Galvanized nickel process life is not less than 30 years, but also suitable for outdoor heavy corrosion environment, high cost; Cold galvanizing process life is not less than 12 years, suitable for outdoor light corrosion environment, the cost is general; Powder electrostatic spraying process life is not less than 12 years, suitable for indoor room temperature dry environment, the price is general. The designer should reasonably select the type of surface anti-corrosion layer of the cable bridge according to the engineering environmental conditions, and clearly express it in the design document.