Analysis of Difficulties and Coping Strategies for Operation, Maintenance and Inspection of Double-Curved GRC Curtain Walls

Amid the wave of contemporary architectural aesthetics and technological innovation, double-curved GRC curtain walls have become the aesthetic centerpiece of landmark buildings with their unique curved forms and artistic expressiveness. However, when these highly designed building skins face operation and maintenance challenges over long-term use, how to solve pain points such as "difficult aerial work, complex structures, and material property limitations" has become a topic of common concern across the industry. As a full-chain service provider with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group draws on its integrated experience from detailed design to after-sales maintenance to thoroughly analyze the maintenance difficulties of double-curved GRC curtain walls and propose systematic response strategies, providing a professional reference for the industry.

I. Analysis of the Core Difficulties in Maintaining Double-Curved GRC Curtain Walls

The difficulty of maintaining and inspecting double-curved GRC curtain walls fundamentally stems from the dual overlap of "morphological complexity" and "material particularity". First, the non-linear construction of double-curved surfaces renders the inspection path planning of traditional flat curtain walls ineffective, as aerial work platforms struggle to fit curved contours, resulting in more inspection blind spots. Second, although GRC materials feature light weight and high strength, long-term exposure to the natural environment makes them susceptible to temperature stress and rainwater erosion, potentially causing surface cracking and fiber aging, while the uneven stress distribution of double-curved structures further increases the risk of localized damage. In addition, some projects give insufficient consideration to later maintenance needs at the design stage—such as concealed anchoring nodes and missing access passages—making later maintenance "visible but unreachable", which greatly increases inspection costs and safety hazards.

II. Strategies for Addressing Difficulties from a Full-Chain Perspective

In response to the maintenance pain points of double-curved GRC curtain walls, Qinglong Group has built a solution integrating technological innovation and accumulated experience based on the full life cycle of "design-construction-maintenance". At the design stage, parametric modeling and BIM technology are used to simulate the stress states of the curtain wall under different environments in advance, optimize the anchoring system and drainage design, and reserve access passages and load-bearing lifting points, reducing later maintenance difficulty at the source. For example, in a double-curved GRC curtain wall project for a grand theater, the Qinglong team used Rhino and Grasshopper for digital design, controlling the positioning accuracy of each GRC component within ±2mm, and installed detachable inspection openings in concealed locations to provide operating space for later maintenance.

In the materials and construction stage, Qinglong relies on the technical strength of its national-level R&D center to improve the crack resistance and durability of GRC materials through formula optimization. By adopting a composite system of high elastic modulus glass fiber and low-alkali cement, the flexural strength of GRC components is increased to over 20MPa, while nano-scale protective coatings are introduced to enhance their impermeability and UV resistance. During construction, 3D laser scanning and modular installation technologies are used to ensure the splicing precision of double-curved components and reduce later structural stress concentration caused by installation errors.

For double-curved GRC curtain walls already in service, Qinglong has innovatively launched "smart maintenance" services: drone inspections and infrared thermal imaging technology quickly locate hidden dangers such as surface cracks and debonding; customized hanging baskets and magnetic inspection platforms adapt to the needs of complex curved surface operations; and digital archives of components are established, combined with RFID chips to achieve full life cycle quality traceability. In a commercial complex project, the Qinglong team successfully completed the inspection of 6,000㎡ of double-curved GRC curtain wall using this model, shortening the traditional construction period by 40% and reducing costs by 30%.

III. Industry Experience and Future Trends

As a participating unit in drafting the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC), Qinglong Group has always believed that the operation and maintenance of double-curved GRC curtain walls should not stop at "problem solving" but should transform toward "preventive management". In the future, as UHPC and GRC composite technologies mature and technologies such as AI visual inspection and digital twins are applied, curtain wall maintenance will achieve a leap from "passive repair" to "active early warning". Qinglong will continue to leverage its 28 years of full-chain service advantages, guided by the mission of "creating beautiful architecture", to provide designers and owners with integrated solutions from material selection to long-term maintenance, driving the architectural decoration industry toward safer, more efficient, and more sustainable development.