High-strength bolts cannot be installed by tapping and reaming
Quality control of steel structures is a critical aspect during the construction process. When installing steel components, strict quality checks must be performed to ensure structural integrity and safety. For columns and beams, it's essential to verify that the base plate under the column is solid, flat, and free from deformation. The vertical alignment and lateral displacement of the columns should be carefully measured, while the beams must be straight with no visible bending. Bolt tightening and cleaning of friction surfaces are also key steps. Only after passing inspection can the lifting operations proceed. Once the steel structure becomes a fixed part of the space and the acceptance process is completed, the construction team should perform a second pour of expanded concrete at the column base and foundation top surface to ensure full compaction and stability.
During bolt installation, both high-strength bolts and ordinary bolts are commonly used. For ordinary bolts, the number of washers on one end should not exceed two. It is important to avoid using gas cutting or reaming for bolt holes, as this can compromise their strength. After tightening, the exposed threads should not exceed two pitches. Before installing high-strength bolts, their product certificates must be checked, and they should undergo re-examination if required. The contact surfaces between connected components must be smooth and flat, with at least 75% of the surface area in contact. High-strength bolts should never be installed by tapping or reaming, as this could damage the threads and reduce their load-bearing capacity.
Before painting, all components must be thoroughly cleaned to remove welding slag, oil stains, water, and burrs. This ensures proper adhesion of the paint and long-term protection against corrosion. The number of coats and the thickness of the applied paint must strictly follow the design specifications. Additionally, it's important to maintain a clean work environment throughout the construction phase to prevent contamination of the steel surfaces. Regular inspections and documentation of each step help maintain transparency and accountability in the quality control process. By following these procedures, the overall durability and performance of the steel structure can be significantly improved.
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