Rust removal, coating and numbering
Coating temperature should comply with the provisions of the coating product manuals, no rules, environmental temperature should be between 5 ~ 38 ℃, relative humidity should not be greater than 85%, component surface without condensation and oil, etc., 4 h after the coating should be protected from being in the rain.
The derusting method and derusting grade on the surface of steel components shall comply with the provisions of the code, and the quality requirements shall comply with the provisions of the national standard "corrosion grade and derusting grade of steel surface before painting". The derusting method and derusting grade of the component surface should be adapted to the paint used in the design.
In the construction drawing, it is indicated that no coating shall be applied on the parts not coated and the friction joint surface of high-strength bolts within the wide range of 30 ~ 50mm at the welding seam and the installation weld. Coating, coating times, coating thickness should meet the requirements of the design.
After the component is coated, it shall be numbered according to the design drawing, and the location of the number shall conform to the principles of easy stacking, easy installation and easy inspection. For large or important components should also be marked with weight, center of gravity, lifting position and positioning marks. The number of the summary data and transport documents, construction organization design documents, quality inspection documents, such as unified, the number can be after the completion of acceptance to be coated.
Pre-assembly of steel structure
Due to the limitation of transportation and equipment installation capacity, or in order to ensure the smooth installation, a number of finished components are set up in the factory as a whole according to the space design requirements, in order to check the connection between the parts, which is called pre-assembly.
Pre-assembly is generally divided into two states, plane pre-assembly and three-dimensional pre-assembly, the assembled components should be in a free state, not forcibly fixed. After the pre-assembly inspection is qualified, the upper and lower positioning center line, elevation datum line, intersection center point and other necessary marks shall be marked on the components, and temporary support and positioner shall be welded when necessary. The allowable deviation shall conform to the corresponding provisions.
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