Analysis of Difficulties and Countermeasures in O&M Inspection of Double-Curved GRC Curtain Walls

As an important carrier of modern architectural skin art, double-curved GRC curtain walls have become the aesthetic centerpiece of landmark buildings with their fluid surfaces and expressive forms. However, with the widespread application of such curtain wall systems in large venues and commercial complexes, their operation and maintenance phases have gradually revealed pain points such as high technical barriers and difficult implementation. As an industry player with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group draws on its full-chain service experience to provide an in-depth analysis of the maintenance challenges and systematic solutions for double-curved GRC curtain walls, covering material properties, structural design, and maintenance practices.

I. Analysis of Core Maintenance Challenges of Double-Curved GRC Curtain Walls

The maintenance challenges of double-curved GRC curtain walls stem from the dual particularity of their material properties and structural forms. First, although GRC (glass fiber reinforced concrete) offers the advantages of light weight, high strength, and flexible shaping, the double-curved form results in uneven stress distribution across components. Under long-term exposure to environmental factors such as temperature changes and ultraviolet radiation, problems such as localized cracking and surface efflorescence are prone to occur. Second, the complex curved geometry makes it difficult to adapt inspection platforms and tools designed for traditional flat curtain walls. For example, at irregular areas with a curvature radius ≤300mm, conventional gondolas or scaffolding cannot achieve full-coverage access without blind spots, increasing the difficulty of inspection and repair. In addition, some projects overemphasize aesthetics at the design stage while neglecting later maintenance needs—for instance, concealed anchoring nodes lack access for inspection, making it difficult to detect potential component loosening in time.

II. Systematic Response Strategies from a Whole-Life-Cycle Perspective

To address the above challenges, Qinglong Group proposes a three-dimensional approach of "prevention first, technology empowerment, and standards leading the way." At the prevention level, BIM technology and parametric modeling are introduced at the detailed design stage, using tools such as Grasshopper to simulate the stress conditions of double-curved components and optimize reinforcement design and anchoring schemes, thereby reducing maintenance risks at the source. In the production phase, high-precision molds and automated spraying processes ensure that surface flatness deviations of GRC components remain within ≤2mm, reducing later repair needs caused by material defects.

Technology empowerment is key to improving maintenance efficiency. Qinglong Group has piloted a "digital twin + intelligent monitoring" system in its projects. By embedding RFID chips and stress sensors in GRC components, data such as thermal deformation and structural loads are collected in real time, and combined with 3D laser scanning, curtain wall health records are generated to enable early warning of potential hazards. For inspection work, an innovative approach combining modular suspended platforms with drone patrols is adopted: drones equipped with infrared thermal imagers can quickly identify surface debonding areas, while customized curved-surface crawling robots perform fine operations such as joint sealing and localized repairs.

The establishment of a standards system provides long-term assurance for maintenance. As a participating drafting unit of the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), Qinglong Group promotes the development of specialized maintenance specifications for double-curved GRC curtain walls, clarifying full-process requirements from routine cleaning (using neutral detergents to avoid surface corrosion) to regular inspections (structural safety assessments every 3 years). For overseas projects, maintenance cycles should also be adjusted according to local climate conditions—for example, in the hot and humid environment of Southeast Asia, the replacement interval for sealant strips should be appropriately shortened.

III. Industry Collaboration: From Material Supplier to Solutions Partner

Efficient maintenance of double-curved GRC curtain walls relies on collaboration across the upstream and downstream of the industry chain. Leveraging its full-chain advantages of "detailed design – manufacturing – construction and installation – after-sales maintenance," Qinglong Group provides customers with customized maintenance solutions: for new projects, a "digital asset package" containing BIM models, component parameters, and repair manuals is delivered simultaneously; for existing buildings, curtain wall health checks and renovation and upgrade services are offered, such as replacing traditional GRC components with UHPC composite panels offering better crack resistance. By jointly establishing a "Curtain Wall Health Management Alliance" with design institutes and contractors, the group promotes a closed-loop management model running from the design source to the maintenance end.

As the art of architectural skin continues to innovate, the maintenance of double-curved GRC curtain walls will face more challenges. Qinglong Group has always taken "Creating Beautiful Architecture" as its mission. Backed by the technical strength of a National High-Tech Enterprise and a provincial-level R&D center, the group continues to explore material improvements and maintenance technology innovations, providing the industry with sustainable solutions that combine aesthetic value and safety assurance. In the future, through the coordinated application of UHPC/GRC/GRG/GRP materials and the continuous refinement of intelligent maintenance systems, double-curved curtain walls will achieve a better balance between "beauty" and "resilience."