How to Achieve Detachable Connections for GRC Curtain Walls?

The demountable connection design of GRC curtain walls is an important direction in the development of building industrialization, with its core lying in solving key technical issues such as the reversibility of connection nodes, precision control, and reusability. In the Shenzhen Yirui Biotechnology Building project, Qinglong Group developed a modular demountable GRC curtain wall system. Through standardized connection nodes and precise tolerance control, rapid replacement of individual panels was achieved, reducing maintenance work that traditionally took several days to completion within 4 hours. This demountable system not only improves maintenance efficiency but also provides technical possibilities for future functional changes to the building.

The reversibility design of connection nodes is the foundation for achieving demountability. The specialized fixing bracket system developed by Qinglong uses mechanical connections, with all connection points designed as bolted or snap-fit connections, avoiding permanent connection methods such as welding or bonding. The brackets are made of corrosion-resistant stainless steel with special hardening treatment on the surface, ensuring that sufficient strength and precision are maintained after multiple assembly and disassembly cycles. Anti-loosening devices are also installed at critical locations to prevent accidental loosening during use.

Tolerance control is a key technology for demountable connections. Qinglong performs tolerance analysis using BIM technology, incorporating all error sources—including component fabrication tolerances, installation tolerances, and in-service deformation—into a unified analysis system. During the production stage, CNC machine tools are used to machine the connection areas, keeping hole position tolerances within ±0.5mm. During the installation stage, laser positioning technology ensures the installation precision of each connection point. This fine tolerance control guarantees precise repositioning even after multiple assembly and disassembly cycles.

The recoverability of the sealing system is equally important. Joint treatment for demountable GRC curtain walls requires a special sealing system. Qinglong developed reusable sealing gaskets and matching compression devices. During disassembly and reassembly, the sealing system can be preserved intact, and after reinstallation, sealing performance is restored by adjusting the compression force. For sealant that needs to be replaced, specialized cleaning tools are used to ensure the bonding surfaces are clean, creating the conditions for re-sealing.

Qinglong Group recommends establishing digital management records for demountable GRC curtain walls, documenting the production information, installation data, and maintenance history of each component. RFID tags are installed on critical connection nodes, allowing relevant information to be read via handheld devices to support maintenance decisions. Through scientific design and refined management, demountable GRC curtain wall systems can provide buildings with flexibility and economy across the full life cycle, adapting to the various possible changes in future use.