Coating standard: JT / T 722-2008 technical conditions for anticorrosive coating of highway and bridge steel structure

Core tips: 1 Scope: Technical requirements for anticorrosive coating of highway and bridge steel structure This standard specifies the classification, requirements, test methods, inspection rules, safety, health, environmental protection and acceptance requirements for anticorrosive coating of highway and bridge steel structures This standard is applicable to anti-corrosion coating of highway and bridge steel structures The anti-corrosion coating of bridge steel structures or steel structures under similar conditions in other application fields can also be implemented by reference 3, classification 3.1 classification of protection life of coating system Paint knowledge | precautions for wall paint color selection Recommended introduction: when painting the wall, the owner sometimes has difficulty in choosing what color of the wall paint to paint In fact, there is no ugly color in the wall paint, only the disharmonious color matching The use of wall color contains the knowledge of health Too strong color will stimulate people's perception, make people have a sense of fidgety, affect people's mental health Grasp the basic principles of wall color and paint a colorful space 1、 Wall paint color selection notice 1 Light color is generally used for the top surface Light colors make people feel light, dark colors make people feel heavy Usually, the treatment of rooms is from top to bottom, from shallow to deep For example, the ceiling and walls of rooms are white and Coating home news: 1 Scope: technical conditions for anticorrosive coating of highway and bridge steel structures this standard specifies the classification, requirements, test methods, inspection rules, safety, health, environmental protection and acceptance requirements for anticorrosive coating of highway and bridge steel structures This standard is applicable to anti-corrosion coating of highway and bridge steel structures The anti-corrosion coating of bridge steel structures or steel structures under similar conditions in other application fields can also be implemented by reference 3 Classification 3.1 protection life of coating system classification 3.1.1 within the protection life of coating system, the corrosion level of more than 95% of the coating area shall not be greater than ri2 specified in IS0 4628, without bubble, peeling and cracking 3.1.2 according to the protection period, it can be divided into two types: ordinary type, 10-15 years; long-term type, 15-25 years 3.2 classification of corrosion environment the classification of corrosion environment meets the requirements of is012944-2, see Appendix A 3.3 the coating parts are classified into six categories according to the coating parts: - outer surface; - inner surface of non closed environment; - inner surface of closed environment; - steel bridge surface; - dry wet alternative area and underwater area; - anti slip friction surface; - auxiliary steel components, including anti-collision guardrail, handrail guardrail and base, lamp holder, drain pipe, steel curb, etc 3.4 the coating stage is divided into three categories according to the coating stage: initial coating: initial coating of new bridge steel structure (including coating within two-year defect liability period); maintenance coating: the maintenance of the coating during the whole operation process of the bridge; ——Repainting: after the old coating is completely removed and the surface treatment is carried out again, the coating shall be carried out according to the complete coating specification 4 requirements 4.1 basic requirements for coating supplier and construction unit 4.1.1 basic requirements for coating supplier: the coating supplier shall obtain the approval certificate of GB / T19001 (IS09001), GB / t24001 (IS014001) and GB / T28001 (OHSAS18001) Have the ability to provide technical services and perform the contract 4.1.2 basic requirements for construction company and constructors 4.1.2.1 construction company shall obtain GB / T19001 (IS09001), GB / t24001 (IS014001) and GB / T28001 (OHSAS18001) approval certificates 4.1.2.2 the construction unit shall have the qualification of anti-corrosion and heat preservation grade II or above or national grade I or above enterprise, and have the ability to ensure the safety and quality of the project 4.1.2.3 the construction personnel shall pass the coating professional training Construction personnel of key construction procedures (sand blasting, painting, quality inspection) shall obtain intermediate coating worker certificate or above Special operation personnel shall have corresponding qualifications 4.2 coating system requirements4.2.1 coating system matching requirements4.2.1.1 coating matching system shall be designed according to corrosion environment, working condition and anti-corrosion life 4.2.1.2 the coating matching system with higher anti-corrosion level is also applicable to the coating matching system with lower anti-corrosion level, and the coating thickness can be designed with reference to the coating matching system with lower anti-corrosion level For the coating matching system under Cl and C2 corrosion environment, please refer to the coating matching system under C3 corrosion environment for design 4.2.1.3 the shop primer is not listed in the coating matching system table In general, a shop primer with a dry film thickness of 20 μ m ~ 25 μ m shall be applied to all matching parts 4.2.1.4 the coating supporting system listed by the coating position is as follows: a) the external surface is the coating supporting system for the external surface of the bridge steel structure exposed to the atmosphere, the common type is shown in Table 1, and the long-term type is shown in Table 2; 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