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 should be checked during the inspection and certification process for these factories?

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

2. Verify the layout of the steel frame structure, specifications of prefabricated components, 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 drawings immediately.

3. Document the current conditions of steel prefabricated components in steel structure factory buildings, such as rust, damage at connection points, coating loss, welding defects in appearance, and the tightness of connections, and conduct inspections and evaluations one by one.

4. A certain number of steel structural prefabricated components are selected for ultrasonic or magnetic particle inspection as per relevant specifications and standards to determine the presence of defects such as weld spatter, arc pit cracks, and arc burn.

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, thus, surface strength testing methods must be employed.

7. Structural steel factory buildings are in use, and the anti-corrosion and safety coatings of their prefabricated components are affected by the environment. 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 structural steel components as above, conduct a series of calculations on the upper structural bearing capacity of the steel structure factory building according to relevant architectural design standards. Determine if the current-stage bearing capacity of the steel structure factory building complies with national standards and the safety application regulations for the mid-to-late stages.

9. In accordance with relevant specifications and 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 requirements and those with structural damage at the current stage.

Certification Basis and Content for Steel Structure Factory Inspection

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

"Standard for Evaluating the Condition of Residential Buildings"

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

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

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

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

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

8. "Technical Code for Reinforcement Detection in Concrete (JGJ/T 152-2008)"

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

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

11. "Code for Design of Reinforcement for Concrete Structures (GB 50367-2013)"

12. Steel Structure Design Code (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 and reinforcement construction materials, decoration construction design drawings, on-site inspections, and test results, etc.

Structural steel workshop inspection and assessment of the鉴定conclusion

Based on regulations and standards such as the "Evaluation Criteria for Hazardous Buildings" and the "Reliability Evaluation Criteria for Civil Buildings," a comprehensive assessment of the house's safety is conducted. The鉴定report is written in accordance with principles of objectivity, science, and fairness, presenting the evaluation conclusions and preliminary measures and methods for handling.