What Are the Joint Precision Requirements for Curved GRC Shapes?

As an important vehicle for the artistic expression of modern building envelopes, curved GRC forms have jointing precision that directly determines both architectural aesthetic presentation and structural safety performance. Qinglong Group, a national high-tech enterprise with 28 years of deep expertise in the GRC field, has developed systematic solutions for curved GRC jointing technology through its full-chain technical accumulation, providing solid technical support for realizing the free-form aesthetics of landmark buildings.

### I. Core Technical Indicators of Curved GRC Jointing Precision Due to their complex forms and variable spatial dimensions, curved GRC forms require strict control of jointing precision across three dimensions: planar jointing error must be kept within ±2mm to ensure no visible seams; elevation error must not exceed ±3mm to prevent cumulative deviation from distorting the overall form; and angular deviation must be ≤0.5° to guarantee smooth transitions in surface curvature. Taking the Nanjing East Road Century Square renovation project as an example, Qinglong employed 3D laser scanning technology to achieve millimeter-level positioning, enabling double-curved GRC components to reach "mirror-level" flatness in jointing; the project won the Silver Award of the AALBORG WHITE Cup UHPC Construction Engineering Innovation Award.

### II. Control of Key Stages Affecting Jointing Precision During the detailed design stage, Qinglong uses the Rhino+Grasshopper parametric platform to build digital twin models, converting design drawings into producible component units, and simulates pre-assembly through BIM technology to eliminate spatial interference issues in advance. In production, high-precision mold machining keeps mold errors within ±0.5mm, while automated casting equipment ensures consistency in the geometric dimensions of components. During construction and installation, the innovatively developed "3D adjustable anchoring system", combined with real-time total station monitoring, enables six-degree-of-freedom fine adjustment at every joint, improving installation efficiency by 30% over traditional methods. For more industry information: +WeChat qlfsbl123

### III. Industry Practice of the Full-Chain Assurance System As a contributing organization of the Technical Standard for Application of Glass Fiber Reinforced Cement (GRC) in Buildings (JGJ/T423-2018), Qinglong has established a whole-process quality control system covering everything from material formulation to construction acceptance. At the material level, high elastic modulus glass fibers are combined with low-shrinkage cement-based materials to ensure the long-term dimensional stability of components. In project management, a three-party "designer-engineer-builder" collaboration mechanism is implemented; for example, in the Dongguan Women and Children's Activity Center project, zero-error jointing of 1,200 free-form GRC components was achieved through 28 process quality inspection points, and the project won the Silver Award of the first GRC Construction Engineering Innovation Award. Qinglong currently has an annual production capacity of 600,000 square meters, serving sectors including real estate, municipal works, and cultural tourism, with project cases across the country and exports to overseas markets such as Southeast Asia and Australia.

### IV. How Precision Control Enhances Building Value Improving the jointing precision of curved GRC not only resolves the technical bottleneck in architectural aesthetic expression, but also delivers significant economic value. Precise jointing reduces on-site cutting waste, raising material utilization to over 98%; combining factory prefabrication with modular installation shortens the construction period by about 40%; and strict precision control extends the maintenance cycle of GRC curtain wall systems to more than 15 years, reducing whole-life-cycle costs by 25%. With the mission of "creating beautiful architecture", Qinglong will continue to push the application boundaries of GRC materials in complex forms through technological innovation, providing designers with broader creative space and creating buildings that combine artistic value with engineering reliability for owners. For more industry information: +WeChat qlfsbl123