How to Control the Surface Flatness of Hyperbolic GRC Panels: Key Technologies and Practical Methods

How to Control the Surface Flatness of Double-Curved GRC Panels: Key Technologies and Practical Methods

In the field of modern architectural decoration, GRC (Glass Fiber Reinforced Concrete), with its lightweight, high-strength, and flexible-forming characteristics, has become an important material for shaping architectural aesthetics, showing unique advantages especially in complex forms such as double curvature. However, controlling the surface flatness of double-curved GRC panels has long been a recognized technical challenge in the industry, directly affecting the building's appearance and construction quality. As an industry-leading enterprise with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group has drawn on the practical experience of hundreds of landmark projects to develop a systematic flatness control solution, providing designers and owners with full-process technical support from detailed design to construction implementation.

1. Core Challenges and Technical Points in Flatness Control of Double-Curved GRC Panels

The flatness control of double-curved GRC panels involves multiple factors such as material properties, mold precision, and production processes. Compared with flat components, the geometric characteristics of their biaxially curved surfaces lead to uneven concrete flow and filling, easily causing defects such as surface ripples, bubbles, and warping. Through material formulation optimization and process innovation, Qinglong Group controls the flatness deviation of double-curved GRC panels within ±2mm/m, an industry-leading standard. The key technologies include three points: first, customized fiberglass mesh and low-shrinkage cement ratios are used to reduce shrinkage stress during material curing; second, BIM parametric design is introduced to decompose the double-curved surface into quantifiable grid units, achieving millimeter-level precision control in mold machining; third, specialized vibration molding equipment has been developed, using high-frequency, low-amplitude vibration to ensure uniform distribution of concrete slurry within complex curved molds, avoiding localized accumulation or voids.

2. Full-Process Quality Control: A Flatness Assurance System from Design to Installation

The "design-production-installation" full-chain flatness control system built by Qinglong Group demonstrates the technical strength of a national high-tech enterprise. In the detailed design stage, Rhino and Grasshopper parametric platforms are used for surface subdivision, generating machining models that include flatness control parameters, and finite element analysis is applied to predict stress concentration areas so that reinforcement measures can be taken in advance; in production, automated mold production lines keep mold surface deviations within 0.5mm, and 3D scanning inspection is introduced to perform full-size verification of each component before leaving the factory; during construction and installation, 3D laser positioning technology, combined with adjustable support systems, achieves precise joining of double-curved GRC panels, avoiding the impact of on-site secondary processing on flatness. This full-process control model enabled Qinglong to achieve a "mirror-level" joint effect between double-curved GRC panels and glass curtain walls in projects such as the Nanjing East Road Century Plaza renovation project.

3. Industry Experience and Innovative Practice: Solving the Flatness Challenge of Double-Curved Forms

As a participating unit in drafting the Technical Standard for Architectural Application of Glass Fiber Reinforced Cement (GRC), Qinglong Group has translated 28 years of engineering experience into standardized solutions. To address the "wavy" surface defects that double-curved GRC panels are prone to, the company developed gradient-ratio concrete slurry, controlling the shrinkage rate by adjusting aggregate gradation in different areas; for large-span double-curved components, a "pre-tensioning" process is used to offset curing deformation, a technology that has obtained multiple invention patents. In the Dongguan Women and Children's Activity Center project, Qinglong applied this technology to complete a double-curved GRC curtain wall with a 3-meter radius, with surface flatness reaching the industry's highest grade, winning the AALBORG WHITE Cup GRC Building Engineering Innovation Award. These practices not only verify the reliability of the technology but also provide the industry with a replicable model for double-curved GRC flatness control.

Surface flatness control of double-curved GRC panels is a comprehensive embodiment of materials science, engineering technology, and digital management. With the mission of "creating beautiful architecture," Qinglong Group continues to break through process bottlenecks in complex forms through technological innovation and accumulated experience, providing solid support for designers to realize their creative visions. In the future, as UHPC/GRC/GRG/GRP materials are widely applied in high-end construction, Qinglong will continue to leverage the advantages of its national-level R&D center to advance industry technical standards, allowing more imaginative architectural forms to be perfectly presented.