Application of Polyurethane Abrasion Resistance Paint on the Arch Gate of Tunnel Spillway in Xiaolangdi

Seventeen consecutive concerned water-sediment regulation has been carried out in Yellow River Xiaolangdi reservoir since 2002, in order to reduce the downstream river channel and reservoir sediment deposition. The water flow went through the arc working gate place will reach 33 m/s during the flood and sand, combined with open/close state under dynamic water in the daily operation, there are some serious erosion pit appeared on the arc facade panels. The gate was thinned, and the service life got shorter, which threated the safe operation of the gate. Therefore, it is necessary to use new type high abrasion resistance and high corrosion double function of paint to repair the gate panel. High elastic polyurethane resistant paint was developed, whose polyurethane was the main basic material, adding antirust pigment and scales the water-blocking material of stainless steel. The abrasive wear performance of two kinds of paint was tested by using rotary machine in the conditions of four different flow velocity and 50 kg/m3 sediment concentration, the results showed that the wear resistance of polyurethane abrasion resistance paint is 50 to 80 times of stainless steel flake epoxy paint. The drawing method is adopted to test the paint and substrate of peel strength, the results showed that the bonding performance of polyurethane abrasion resistance paint is equal to the stainless steel flake epoxy paint. The self-developed paint was carried out on the arc working gate place after a flood test, compared with the traditional protection plan, the results showed that the paint on arc gate had played a very good effect of corrosion and abrasion protection, and had very good practicability and value of popularization and application, which provided reference for other tunnel gate abrasion protection.