Due to the rapid promotion of urban construction, many buildings have brought unique creativity into their design, thus various building materials have been vigorously promoted. Steel structure is one of the building materials, and its use has showcased many wonderful building designs. However, at the same time, because steel structures exist outdoors for a long time and are easily affected by ultraviolet radiation, corrosive media, etc., which affects the service life of steel structures, they need to be sprayed with paint before construction. The benefits of spraying paint include anti-corrosion and fireproof properties. Let’s learn about the construction steps of spraying paint together.
1. Under normal circumstances, spraying construction can only be carried out after the steel structure is installed in place, and the suspension rods, raceways, pipe racks, and other related components connected to it have been installed and accepted as qualified (if construction is carried out in advance, fireproof spraying should be applied to the steel components before hoisting, and damaged coatings and steel structure joints should be repainted after installation);
2. Before spraying, the surface of the steel structure should be derusted and treated with rust prevention according to design requirements. Some fireproof coatings have a certain rust prevention effect, and the design should clarify whether rust prevention treatment should be carried out;
3. Before spraying, the dust, oil stains, and debris on the surface of the steel structure should be cleaned thoroughly. The gap with a width of 4-12mm at the connection of steel components should be filled and leveled with fireproof coating or other fireproof materials, such as aluminum silicate fiber cotton. When the surface of the steel component has been coated with anti rust paint, the coating is hard and shiny, which will significantly affect the bonding strength of the fireproof coating, sandpaper should be used to polish it appropriately before spraying;
4. The construction of fire-resistant coatings for steel structures should be carried out before indoor decoration and under conditions that are not damaged by subsequent engineering. During construction, plastic sheeting should be used to cover and protect walls, doors and windows, machinery and equipment, and other components that do not require fire protection;
5. For most fireproof coatings, during the construction process and before the coating dries and solidifies, the ambient temperature should be maintained at 5-38 ℃, the relative humidity should not exceed 85%, and the air should flow. When the wind speed is greater than 5m/s or in rainy weather or when condensation forms on the surface of components, work should not be carried out. The application temperature and humidity range of chemically cured and dried coatings can be relaxed (for example, LG steel structure fireproof coating can be applied at -5 ℃).
