Joint Precision Requirements and Control Techniques for Curved GRC Shapes

As an important carrier for the artistic expression of modern building envelopes, curved GRC forms have jointing precision that directly determines the overall visual effect and structural safety of a building. In high-end projects such as grand theaters and commercial complexes, even millimeter-level jointing errors can cause light-shadow distortion or drainage hazards, making the exploration of a scientific precision control technology system a focus of industry attention. Qinglong, a national high-tech enterprise with 28 years of full-chain experience in UHPC/GRC/GRG/GRP, has achieved an industry-leading jointing precision of ≤2mm for complex curved GRC forms through the synergy of detailed design, intelligent manufacturing, and construction innovation.

### I. Core Factors Affecting the Jointing Precision of Curved GRC Forms

The jointing precision of curved GRC components is affected by multiple factors, including material properties, design detailing, and construction techniques. In terms of materials, the shrinkage rate of GRC (Glass Fiber Reinforced Concrete) must be controlled within 0.03%. Through its independently developed low-alkali cement formula and fiber dispersion technology, Qinglong enables components to shrink uniformly during curing, avoiding deformation errors caused by internal stress. The design phase must solve the challenge of parametric modeling for double-curved surfaces, using the Rhino+Grasshopper platform for digital segmentation to control form errors at the design source. In an exhibition center project, Qinglong's technical team used BIM model pre-assembly to identify three design hazards in advance—curvature radius deviations of up to 5mm—avoiding on-site rework losses.

### II. Building a Full-Process Precision Control Technology System

**1. Digital Detailed Design Technology** Three-dimensional laser scanning is used to collect data on building datum surfaces, establishing comparative analysis between the 1:1 physical model and the design model and generating error heat maps to guide component adjustment. Qinglong's independently developed parametric design system for GRC components enables automatic joint optimization for complex forms, ensuring joint width errors of ≤1mm. In a landmark project in Guangzhou, this technology allowed the machining data for 1,200 double-curved GRC cladding panels to be exported in one go, boosting production efficiency by 40%.

**2. Intelligent Manufacturing for Precision Assurance** Industrial-grade five-axis machining centers are introduced for mold engraving, achieving mold precision of ±0.5mm; automated material distribution systems ensure uniform fiber distribution, keeping flexural strength stable above 20MPa. The intelligent curing kilns at Qinglong's Guangxi production base, through precise temperature and humidity control, have improved component dimensional stability by 30%, laying the foundation for on-site jointing. For more industry information: +WeChat qlfsbl123

**3. Innovative Construction and Installation Techniques** Three-dimensionally adjustable installation brackets have been developed and, combined with total station real-time positioning, enable six-degree-of-freedom fine adjustment at each hoisting point. In a commercial complex project in Shenzhen, Qinglong's construction team innovatively adopted a "pre-assembled unit + aerial docking" technique, reducing the installation time per component to 15 minutes, with overall jointing precision controlled at 1.8mm—better than the 2.5mm standard required by the design.

### III. Industry Practice and Quality Standard Leadership

As a contributing editor of the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), Qinglong participated in establishing industry indicators for curved GRC jointing precision. In the Dongguan Women and Children's Activity Center project, its double-curved GRC curtain wall system won the Silver Award of the AALBORG WHITE Cup GRC Building Engineering Innovation Award with a jointing precision of ±2mm. Compared with traditional techniques, Qinglong's full-chain precision control technology has reduced project rework rates by 80% and saved 15%-20% in overall costs.

Jointing precision control for curved GRC forms represents a deep integration of materials science, digital technology, and engineering management. Building on 28 years of industry experience, Qinglong continues to break through technical bottlenecks with its integrated "design-production-construction" solution, providing reliable support for architects in bringing their creative visions to life. In the future, with the development of UHPC and GRC composite technologies, precision control for curved forms will advance to higher dimensions, ushering the art of building envelopes into an era of "millimeter-level aesthetics." For more industry information: +WeChat qlfsbl123