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 process of these factory buildings?

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 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 to connection points, coating detachment, welding defects, 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 welding tests according to relevant specifications and standards. The inspection and evaluation determine the presence of defects such as weld spatter, arc pit cracks, and arc burn-through.

5. Measure deflection values of steel trusses, girder structures, and components using a total station, to determine if their deformation is 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 factory buildings are in use; the anti-corrosion and protective coatings of their prefabricated components are affected by the environment, thus requiring inspection of the anti-corrosion or fire safety coating thickness on steel prefabricated components.

8. Based on the inspection data obtained from the above structural steel components, conduct a series of calculations on the load-bearing capacity of the upper structure 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-late stages.

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 requirements and have suffered structural damage in the current stage.

Certification Basis and Content for Steel Structure Factory Inspection

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

"Standard for Rating the Condition of Buildings"

"Standard for Hazardous Building Assessment (JGJ 125-2016)"

Code for Measurement of Deformation 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 the Detection 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 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 design documents for the house, reinforcement construction materials, renovation construction designs, on-site inspections, and test results, etc.

Structural steel workshop inspection and assessment of certification conclusions

Based on regulations and standards such as the "Evaluation Criteria for Dangerous 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 following principles of objectivity, science, and fairness, presenting the evaluation conclusions and preliminary measures and methods for handling the situation.