Materials commonly used in most factory buildings are steel. To ensure the safety of these steel structures, 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 on the steel structure factory building, such as the building's usage, structural layout, construction date, number of floors, and various blueprints.

2. Verify the steel frame layout, prefabricated 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. Document the current status of steel pre-fabricated components in steel structural workshops, such as rust, damage at connection points, coating loss, welding defects in the appearance, and the tightness of connections, and conduct inspections and evaluations 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. Assess whether defects such as weld beads, arc pit cracks, and arc burn-through are present.

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 structure factory buildings, their prefabricated components' corrosion resistance and safety coatings are affected by the environment, thus 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 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 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 have experienced structural damage in the current phase.

Certification Basis and Content for Steel Structure Factory Inspection

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

"Standard for Assessment of Residential Property Condition and Damage Level"

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

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

5. "Standard for Building Structure Inspection Technology (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 Testing Concrete Strength by Core Sampling Method" (JGJ/T 384-2016)

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

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

12. Specification for Steel Structure Design (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 designs, on-site inspections, and test results, etc.

Structural steel workshop inspection and appraisal of certification conclusions

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