L, steel structure fire retardant coating varieties and technical performance meet the design requirements, and after testing in accordance with the provisions. Check the product quality certificate, Chinese mark and inspection report.
2. Derusting of steel surface and painting of rust-proof primer before fire retardant coating shall comply with the design requirements and relevant standards. Check the surface rust removal with a shovel, and compare it with the pictures specified in GB8923 "Rust grade and rust removal grade of steel surface before painting". Primer coating is used for inspection of paint film thickness gauge. Each component is inspected at five locations, and the value of each location is the average of the dry film thickness of three coating points with a distance of 50.
3. The bond strength and compressive strength of fire-retardant coatings for steel structures shall comply with the provisions of CECS 24: 90 Technical Specification for Application of Fire-retardant Coatings for Steel Structures. The inspection method shall comply with GB9978 "Test Method for Performance of Fire-resistant Spraying Materials for Building Components" and check the inspection report.
4. The coating thickness of Bo Tu fire retardant coating should meet the design requirements of fire resistance limit. The thickness of thick-coated fire retardant coating, of which 80% or more should meet the design requirements of fire resistance limit, and the thickness of the thinnest part should not be less than 85% of the design requirements. Check with coating thickness gauge, measuring needle and steel rule. The measurement method shall conform to CECS 24: 90 Technical Specification for Application of Fire Retardant Coatings for Steel Structures and Appendix F of this specification.
5, Bo Tu fire retardant coating surface crack width should not be greater than 0.5 _; The surface crack width of thick fire retardant coating should not be greater than 1_.
The second is macro-inspection, general projects;
1. The model, name, color and expiration date of the fire retardant coating are consistent with its quality certificate, and there is no crust, caking and gel phenomenon after opening. Observe and check.
2, fire retardant coating at the grass-roots level should not have oil, dust, mud and other dirt. Observe and check.
3, fire retardant coating should not be wrong, missing coating, coating should be closed without delamination, empty drum, obvious depression, loose pulverization and laitance and other appearance defects, mastoid has been removed, observation and inspection. Nowadays, a large number of super-high-rise buildings with steel structures emerge, and the application of fire-retardant coatings in steel structures is more popular. Once a fire breaks out in a high-rise building, it cannot be put out in a short time due to the limitation of fire-fighting equipment. Therefore, in architectural design and construction, we should increase the fire protection of steel structure surface to improve its fire resistance limit, and formulate necessary fire prevention measures in architectural design to ensure personnel safety and reduce asset losses.