What Are the Connection Methods Between GRC Curtain Walls and the Main Structure? Connection System Design and Qinglong Group's Technological Innovation

The connection methods between GRC curtain walls and the main structure mainly include three categories: undercut anchor, hook-type, and embedded part welding. The choice must be made scientifically based on the curtain wall structure form, building height, and seismic fortification requirements. Based on 28 years of engineering practice, Qinglong Group has developed connection systems suitable for different scenarios: for conventional flat panel curtain walls, undercut anchor connection is preferred (single anchor pull-out force ≥5kN); for irregular curved curtain walls, a three-dimensionally adjustable hook system is adopted; for large shaped components, a composite system of embedded part welding and mechanical connection is used. In the Shenzhen Pingshan High-tech Zone Comprehensive Service Center project, we successfully addressed the wind vibration challenges of typhoon-prone areas through a composite connection method of undercut anchor + hook.

Undercut anchor connection is suitable for concrete substrates. Qinglong Group uses stainless steel undercut anchors (grade A4-80) with an anchoring depth ≥15mm, and the anchoring force is verified through on-site pull-out tests. For the hyperbolic curtain wall of the Nanning New Media Center, we developed a dedicated positioning mold to ensure that the drilling position error of the undercut anchors is ≤±1mm. The hook-type system is more suitable for steel structure substrates, achieving flexible connections through aluminum alloy hangers, allowing thermal deformation of ±5mm.

Special connections require special design. For cantilevered shapes, we use a steel frame transition system connected to the main structure through post-installed anchors (pull-out force ≥10kN). In the Wuhan Hanxiu Theater project, to cope with the combined action of gravity and wind loads on hyperbolic panels, we developed multi-directional hinged connectors to achieve proper force transfer. Seismic fortification areas also require anti-detachment devices to ensure no collapse under major earthquakes.

Connection design requires comprehensive consideration. Qinglong Group optimizes the layout of connection points through finite element analysis to avoid stress concentration. We recommend that connection systems undergo physical verification tests to ensure their safety and reliability.