What Are the Connection Methods Between GRC Curtain Walls and the Main Structure? Analysis of Applicable Scenarios and Safety Guarantees

The connection methods between GRC curtain walls and the main structure must be selected comprehensively based on component type, load conditions, and architectural form. The core options include four mainstream methods: dry-hanging, embedded, back-bolted, and pin connections, each with its own suitable scenarios and technical requirements. As a Grade II qualified enterprise for professional contracting of architectural curtain wall engineering, Qinglong has ensured safe and reliable connections through scientific selection and precise construction in thousands of projects, including the Shenzhen Pingshan High-tech Zone Comprehensive Service Center, establishing itself as an industry benchmark.

Dry-hanging connection: The first choice for non-load-bearing GRC curtain walls, suitable for flat panels and simple special-shaped components. The core structure is "GRC component – hanger – keel – main structure"; hangers are made of 304/316L stainless steel, with the number of hangers designed according to component weight (no fewer than 4 per square meter), and keels use hot-dip galvanized square steel fixed to the main structure with expansion bolts. Dry-hanging connections offer the advantages of convenient construction and replaceability, suitable for mid- and low-rise buildings or decorative curtain walls. In Qinglong's Sanya Yingbin No. 1 project, over 3,000 square meters of GRC curtain wall adopted dry-hanging connection with hanger pull-out resistance ≥5kN, successfully withstanding wind loads. Dry-hanging connections require key control of hanger spacing and anchoring depth; Qinglong determined through structural calculations that hanger spacing ≤500mm and expansion bolt anchoring depth ≥100mm to ensure connection stability.

Embedded connection: The core choice for load-bearing or large GRC curtain walls, suitable for thick panels and oversized special-shaped components. During GRC component production, stainless steel plates or anchor bars are pre-embedded in advance; at installation, they are welded or bolted to the pre-embedded steel plates of the main structure, with weld height ≥6mm, and bolted connections use double nuts for locking and anti-loosening. Embedded connections offer the advantages of strong load-bearing capacity and good integrity, suitable for high-rise, super high-rise buildings, or large public buildings. The 30,000-square-meter GRC curtain wall of the Shenzhen Pingshan High-tech Zone Comprehensive Service Center (a Luban Award project) used embedded connections for its core load-bearing components, with shear strength ≥8kN, ensuring long-term safe use. For embedded connections, Qinglong uses BIM technology for collaborative design to ensure the position error of embedded parts is ≤±2mm, avoiding misalignment during installation.

Back-bolted connection: The preferred choice for high-precision GRC curtain walls, suitable for large-sized components with high flatness requirements. Stainless steel back bolts (diameter ≥10mm) are used, with holes drilled in the back of GRC components using specialized equipment; the back bolts penetrate ≥30mm into the components, forming a mechanical lock with the components, and are then connected to the main structure keel via connectors. Back-bolted connections offer the advantages of uniform load distribution and minimal damage to components, enabling "stress-free installation"; they are suitable for complex shapes such as double-curved and openwork designs. All 8,800 square meters of the stone-imitation GRC curtain wall components of the Dongting Lake Museum adopted back-bolted connections, with installation precision controlled within ±2mm and no connection marks on the surface, achieving superior decorative effects. Qinglong's back-bolted connections require component compactness ≥95% to avoid edge chipping and cracking during drilling.

Pin connection: A supplementary method for thin-walled or auxiliary connections, suitable for small special-shaped components. GRC components are connected to the main structure or keel via stainless steel pins (diameter ≥6mm), with pin spacing ≤500mm; it is suitable for thin-walled GRC components with thickness ≤20mm or serves as an auxiliary connection method. In the colored openwork carved GRC curtain wall of the Nanning Liyuan Hotel, Qinglong adopted a composite "back bolt + pin" connection, with back bolts as the main load-bearing points and pins for auxiliary positioning, ensuring both load-bearing capacity and improved installation precision. Pin connections must ensure a bond strength between pins and components of ≥3MPa; Qinglong enhances connection reliability by reserving pin holes and filling them with specialized adhesives.

The selection of connection methods must follow the principles of "safety first, scenario suitability, and construction feasibility." Qinglong provides specialized connection design solutions for each project, making comprehensive judgments based on component weight, load conditions, and installation environment; all connection nodes are verified through mechanical performance testing and on-site trials. For owners and designers, a scientific connection method is the core guarantee of GRC curtain wall safety. With full-chain technical capabilities, Qinglong provides precise connection solutions for different types of projects, ensuring the dual unity of decorative effect and structural safety.