This standard specifies the classification, specifications, models, and structural forms of spherical steel bearings for urban rail transit bridge beams, requirements, testing and inspection methods, inspection rules, markings, packaging, transportation and storage, installation and maintenance, etc. This standard is applicable to spherical steel bearings for urban rail transit bridge beams with a vertical design bearing capacity of 500 kN~100 000 kN. Spherical steel bearings for intercity rail transit bridges can be referred to for implementation. The following normative references are essential for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest version (including all modification orders) applies to this document. GB/T 699 High Quality Carbon Structural Steel GB/T 700 Carbon Structural Steel GB/T 1033.1 Plastics, Non cellular Plastics Determination of Density Part 1; Immersion method, Liquid pycnometer method and titration method GB/T 1040.1 Determination of tensile properties of plastics Part 1: General principles GB/T 1040.3 Determination of tensile properties of plastics Part 3: Test conditions for thin films and sheets GB/T 1184--1996 Tolerances on shape and position without individual tolerance values GB/T 1591 Low alloy high-strength structural steel GB/T 1804--2000 General tolerances Tolerances on linear and angular dimensions without individual tolerance indications GB/T 3077 Alloy structural steel GB/T 3280--2007 Stainless steel cold rolled steel plates and strips GB/T/ T 3398.1 Determination of hardness of plastics - Part 1: Ball indentation method GB/T 4171 Weathering resistant structural steel GB/T4956 Measurement of thickness of non-magnetic coatings on magnetic substrates - Magnetic method GB/T 7233.1-2009 Steel castings and ultrasonic testing - Part 1: General purpose steel castings GB/T 7760 Determination of adhesion strength between vulcanized rubber or thermoplastic rubber and hard plates -90 ° peel method GB/T 11352 General engineering carbon steel castings GB/T15957-1995 Classification of atmospheric corrosion HG/T 2502-- 19935201 Silicone grease TB/T1527-2011 Technical conditions for protective coating and coating supply of railway steel bridges TB/T3274-2011 Technical conditions for multi-element alloy co infiltration anti-corrosion of railway concrete beam accessories
Function of testing report:
1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report
2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific, fair, and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problemsBaijian and testing process:
1. Telephone communication and confirmation of requirements
2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:
1. The testing industry is fully covered, meeting different testing needs
2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate
4. Free initial testing, with no testing fees charged
5. Self service order delivery for free on-site sampling
6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in China