Materials commonly used in most factories are steel. To ensure the safety of these steel structures, it's essential to inspect the steel, making steel structure safety inspection and certification indispensable. So, what aspects need to be checked during the inspection and certification of these factories?

1. Gather basic information on the steel structure factory buildings on-site, such as the purpose of use, structural layout, construction time, number of floors, and various drawings of the factory buildings.

2. Conduct a verification of the steel frame structure layout, prefabricated component specifications, and floor heights based on the factory engineering drawings collected in Step 1. For factories without relevant engineering drawings, measurements must be taken on the spot and the corresponding drawings must be drawn.

3. Record the current conditions of steel prefabricated components in steel structural workshops, such as rust, damage to connection points, coating loss, defects in welding appearance, and the tightness of connections, and conduct inspections and evaluations one by one.

4. Extract a certain number of steel structural prefabricated components, and select ultrasonic or magnetic particle inspection according to relevant specifications and standards for welding detection. Assess whether there are defects such as weld beads, arc pit cracks, and arc burn-through.

5. Utilize total stations to measure the deflection values of steel trusses, girder structures, and components, determining if their degree of deformation falls within the specified range.

6. The compressive strength of stainless steel sheets determines the safety of steel structural components, thus, surface strength testing methods must be employed.

7. Steel structure factory buildings in use will have their anti-corrosion and safety coatings for prefabricated components affected by environmental factors. Therefore, it is necessary to inspect the thickness of the anti-corrosion or fire safety coatings on steel prefabricated components.

8. Based on the inspection data obtained from the above structural steel components, conduct a series of calculations on the upper structural load-bearing capacity of the steel structure factory building according to relevant architectural design standards. Determine if the current load-bearing capacity of the steel structure factory building complies with national standards and safety application regulations for the mid to long term.

9. In accordance with relevant specification standards, assess the safety level of the current steel structure factory buildings, and propose effective solutions for prefabricated components that do not meet safety application regulations and those with structural damage at the current stage.

Certification Basis and Content for Steel Structure Factory Building Inspection

"Standard for Reliability Appraisal of Industrial Buildings (GB 50144-2019)"

"Standard for Assessment of Building Condition and Damage Level"

3. "Standard for Evaluation of Hazardous Buildings" (JGJ 125-2016)

"Code for Measurement of Building Deformation (JGJ 8-2016)"

5. "Building Structure Testing and Inspection Technical Standards" (GB/T 50344-2019)

6. "Code for Design of Concrete Structures (GB 50010-2010 2015 Edition)"

7. "Code for Design of Building Structures Load (GB 50009-2012)"

8. "Code for Testing Technology of Reinforcing Steel in Concrete (JGJ/T 152-2008)"

9. "Technical Code for Concrete Strength Testing by Core Method (JGJ/T 384-2016)"

10. "Standard for Seismic Evaluation of Buildings (GB 50023-2009)"

11. "Code for Reinforced Concrete Structure Strengthening Design" (GB 50367-2013)

12. "Code for Design of Steel Structures" (GB 50017-2017)

13. Other technical standards, specifications, and procedures required by national regulations such as "Statistical Treatment and Interpretation of Outliers in Normal Samples" (GB/T 4883-2008).

14. Original design documents for the house, reinforcement construction materials, renovation construction designs, on-site inspections, and test results, etc.

Structural steel factory inspection and assessment of the conclusion

Based on the "Standard for Identification of Dangerous Buildings," "Standard for Reliability Identification of Civil Buildings," and other regulations and standards, conduct a comprehensive assessment of the house's safety. Draft the identification report in accordance with the principles of objectivity, science, and fairness, and propose conclusions of identification as well as preliminary measures and methods for handling.