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

1. Gather basic information about the steel structure factory building on-site, such as the factory's purpose, structural layout, construction date, number of floors, and various drawings of the building.

2. Verify the steel frame layout, precast component specifications, and floor heights based on the factory engineering drawings collected in Step 1. For factories without relevant engineering drawings, measure on-site and draw the necessary plans immediately.

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

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

5. Utilize total stations to measure the deflection values of steel trusses, truss 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, hence surface strength testing methods must be employed.

7. Steel structural workshops in use, the corrosion resistance and safety coatings of their prefabricated components are affected by the environment, so it is necessary to inspect the thickness of the corrosion or fire safety coatings on steel prefabricated components.

8. Based on the inspection data obtained from the above structural steel component checks, conduct a series of calculations on the upper structural load-bearing capacity of the steel structure factory according to relevant architectural design standards. Determine if the current load-bearing capacity of the steel structure factory meets national standards and safety application regulations for the later stages.

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

Certification Basis and Content for Steel Structure Factory Inspection

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

2. "Standard for Evaluation of House Condition and Damage Level"

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

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

5. "Building Structure Inspection Technology Standard" (GB/T 50344-2019)

"6. Concrete Structure Design Code (GB 50010-2010, 2015 Edition)"

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

8. "Technical Code for the Inspection of Reinforcement 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 Design of Reinforcement of Concrete Structures (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 architectural design documents, reinforcement construction materials, renovation construction drawings, on-site inspections, and test results.

Structural steel workshop inspection and appraisal of the鉴定conclusion

Based on the "Standard for Identification of Hazardous Buildings" and the "Standard for Reliability Identification of Civil Buildings" and other regulations and standards, a comprehensive assessment of the house's safety is conducted. The identification report is compiled following principles of objectivity, science, and fairness, presenting identification conclusions and preliminary measures and methods for handling.