1.Frame Curtain Wall: Requirements for Basic Load-bearing Precision Steel Profiles
The frame curtain wall takes upright posts and cross beams as the core stress system, and precision steel profiles need to take into account load-bearing stability and installation convenience. In terms of mechanical properties, upright posts adopt steel of Q355B grade or above with a yield strength ≥345MPa to ensure resistance to wind load and dead weight, and cross beams can adopt steel of Q235B grade to adapt to secondary stress requirements.
In terms of process precision, the dimensional tolerance of the profile cross-section shall comply with the GB/T 19804-2005 Class B standard, and the straightness deviation of upright posts shall be ≤0.5mm/m to ensure precise docking with panels. The surface treatment adopts hot-dip galvanizing (film thickness ≥85μm) + fluorocarbon spraying process, and the salt spray test resistance reaches more than 2000 hours, adapting to the outdoor environment of general buildings.
2.Unitized Curtain Wall: Requirements for Integrated and Efficient Precision Steel Profiles
The unitized curtain wall integrates panels and steel skeletons in the factory, and precision steel profiles need to meet the requirements of modular prefabrication and hoisting strength. In terms of steel selection, high-strength Q460C grade steel is adopted with a tensile strength ≥550MPa to cope with the concentrated load during the overall hoisting of units, and the wall thickness of the profile is increased by 1.2-2mm compared with that of the frame type.
Connection precision is the core. BIM parametric design is adopted for profile interfaces, and the tolerance of bolt hole positions is controlled within ±0.3mm to ensure seamless docking between units. The surface treatment adopts automatic electrostatic spraying with a film thickness uniformity error ≤5μm, combined with a nano self-cleaning coating to improve the maintenance convenience of super high-rise curtain walls. After application in a super high-rise project, the on-site installation efficiency was improved by 40%.
3.Special-shaped Curtain Wall: Requirements for Complex Adaptive Precision Steel Profiles
Special-shaped curtain walls (such as curved and broken line shapes) have strict requirements on the forming precision and mechanical adaptability of precision steel profiles. Weathering steel Q355NH or 316L stainless steel is selected for steel, which has both corrosion resistance and toughness to adapt to the processing requirements of complex curved surfaces. CNC bending technology is adopted with a bending radius tolerance of ±0.5°, and hyperboloid profiles are formed by mold cold pressing with a profile tolerance ≤0.8mm.
In terms of welding technology, laser welding is adopted to reduce thermal deformation, and welds are polished to Ra≤0.8μm to ensure the smoothness of curved surfaces. In the special-shaped curtain wall project of a cultural center in Shanghai, through BIM simulation and precision processing, 260 special-shaped steel components were seamlessly spliced with an installation accuracy of millimeter level.
4.Conclusion: Core Competitiveness Behind Differential Adaptation
The differences in the requirements of different Curtain wall structures for precision steel profiles are essentially the "customized" matching of mechanical properties, process precision and environmental adaptation. Frame type focuses on basic load-bearing, unit type focuses on integrated precision, and special-shaped curtain wall focuses on forming adaptation. Relying on precise steel selection, precision processing technology and full-process control capability, Angyihao can customize precision steel profile schemes according to curtain wall types, and its surface treatment technology makes the profiles take into account weather resistance and aesthetics. In the future, as curtain wall forms become more complex, precision steel profiles will be upgraded to "high strength + high precision + lightweight", and Angyihao precision steel is expected to continue to lead in the field of differential adaptation.
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