What kind of workers are needed for steel box girder anticorrosion engineering?

The anti-corrosion project of steel box girder needs electrician, painter, safety officer, anti-corrosion technician, scaffolder and other workers.

Anti-corrosion construction method

1 The surface treatment of the fire water tank (V-4 10 1A/B) adopts sand blasting for rust removal. The external surface grade: sa2.5, the internal surface grade: sa2.5, and the surface pretreatment quality of other basic components is St2.

2. The coating is sprayed by air and painted locally by hand, which has the advantage of uniform painting. The preparation method and interval are carried out according to the manufacturer's product instruction manual.

3. The inner surface of the fire water tank (V-4 10 1A/B) should be coated with WT- 1 waterborne epoxy anticorrosive paint, and the dry film thickness should be above 180μ m; External surface of storage tank, ladder platform, etc. WF70 chemical atmospheric corrosion inhibitor shall be applied, and the dry film thickness shall be 200um. Brush the bottom of the tank with asphalt paint twice.

4. When there are no special requirements, the brushing method is generally adopted, and each layer of paint is brushed into a uniform and continuous film as much as possible without gaps. Any thinness, missing coating, unevenness, bubbles, pinholes, dripping, brush marks and other defects should be repainted. The coating thickness is180um ~ 200um or according to painting requirements.

5. When painting, the ambient temperature or surface temperature is generally within the range of 10~40℃. Painting must be carried out in sunny days, and it is not suitable for painting in rainy days, snowfalls, strong winds and when the metal surface temperature is lower than the dew point temperature, resulting in water condensation.

6. For pressure-bearing equipment, it must be painted after heat treatment and inspection. After all welds are inspected and the pipeline pressure test is qualified, the pipeline can be painted. When the pipeline is difficult to paint after installation, it can be painted in advance, but the weld or other damaged paint film should be repainted.

7. Before painting, be sure to check whether the quality of the previous layer of paint is qualified and whether it has been thoroughly dried before painting the next layer.