Reinforcement Measures and Application Techniques for Hollow GRC Forms

Reshaping spatial aesthetics through technological breakthroughs, hollowed-out GRC enables building façades to achieve the artistic expression of "light, delicate, and transparent."

In contemporary architectural design, hollowed-out GRC shapes have become the preferred solution for high-end building façades thanks to their unique expressiveness of light and shadow and structural plasticity. As an industry technology leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP, Qinglong Group deeply understands the technical pain points of hollowed-out GRC in detailed design, production, and installation. Through the integrated application of optimized material formulations, structural engineering innovation, and digital construction technology, it has successfully provided safe and reliable hollowed-out GRC solutions for hundreds of landmark projects in China and abroad.

I. Technical Challenges and Reinforcement Logic of Hollowed-Out GRC Shapes

Due to the presence of numerous through-going voids, hollowed-out GRC components differ significantly in mechanical performance from conventional solid GRC. In actual engineering, three core problems require focused solutions: first, the cracking risk caused by stress concentration in hollowed-out areas; second, the vulnerability of thin-walled structures during transportation and installation; and third, precise molding control of complex openwork patterns. Drawing on the practice of 200+ projects, the Qinglong technical team has summarized a trinity reinforcement system of "material-structure-process." Based on a customized formula with a glass fiber volume content of 1.5%–2.0%, combined with topological optimization using finite element analysis software, the flexural strength of hollowed-out components is improved by more than 30%, reaching the industry-leading level of 22MPa.

II. Four Reinforcement Technologies to Break Through Application Bottlenecks of Hollowed-Out GRC

Addressing the technical characteristics of hollowed-out GRC, the reinforcement technology system developed by Qinglong covers:

1. Bionic Reinforcement Technology: Drawing on the principle of honeycomb structures, hollowed-out areas adopt a composite arrangement of grid-shaped fiber reinforcement mesh and spiral reinforcement, improving stress dispersion efficiency by 40%. A typical application is the hollowed-out sunshade panel project of the Dongguan Women and Children's Activity Center, which achieves a maximum opening rate of 60% while meeting wind pressure resistance requirements.

2. UHPC Interface Reinforcement Process: A 3-5mm thin UHPC layer is composited onto the surface of the GRC substrate, using the ultra-high density of UHPC to solve the water penetration problem of hollowed-out components. This technology has been successfully applied to a coastal project in Saudi Arabia, withstanding the test of a high-salt-spray environment.

3. Digital Pre-assembly Technology: By combining BIM models with 3D scanning technology, millimeter-level precision control of hollowed-out components is achieved. In the Century Plaza renovation project on Nanjing East Road, the on-site assembly errors of more than 500 special-shaped hollowed-out GRC panels were all controlled within 2mm.

4. Modular Installation System: The development of dedicated aluminum alloy support frames and adjustable connection nodes increases the installation efficiency of hollowed-out GRC components weighing up to 80kg each by 50%, while ensuring structural safety in areas with a seismic fortification intensity of 8 degrees.

III. Innovative Applications of Hollowed-Out GRC in Architectural Scenarios

Technological breakthroughs in hollowed-out GRC bring more possibilities to architectural design: in the commercial complex sector, a landmark project in Guangzhou adopted a parametrically designed hollowed-out GRC façade, combining more than 2,000 custom components to achieve dynamic façade effects that change with the light; in the cultural building sector, the hollowed-out GRC relief wall of a provincial museum perfectly blends traditional ornamentation with modern materials, with the largest single component measuring 4.2m×1.8m; in landscape engineering, the hollowed-out GRC seating system of a coastal park in Shenzhen achieves the dual functions of structural load-bearing and artistic form through integrated design.

As a major contributing unit of the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC), Qinglong Group has always driven industry development through technological innovation. The reinforcement technology for hollowed-out GRC shapes not only expands the application boundaries of GRC materials, but also provides architects with complete solutions from creative concept to implementation through full-process control of "design-production-construction." In the future, with the deepened application of UHPC and GRC composite technology, Qinglong will continue to explore lighter, more durable, and more expressive building façade systems, helping to fulfill the corporate mission of "creating beautiful architecture."