Splicing Precision Requirements and Assurance Measures for Curved GRC Structures

【The Beauty of Curves, Built on Precision: Innovative Practice and Quality Assurance in GRC Shaped-Element Jointing Technology】

Architecture is frozen art, and curved GRC (glass fiber reinforced concrete), with its unique plasticity, is becoming an important vehicle for modern architectural aesthetic expression. From the streamlined curtain walls of grand theaters to the sculpted canopies of commercial complexes, the perfect presentation of every curved form depends on millimeter-level joint precision control. As an industry player with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group has learned from more than a thousand project practices that the jointing precision of curved GRC is not merely a technical indicator, but a core guarantee for realizing architectural artistic value.

### I. Core Challenges and Industry Standards for Curved GRC Joint Precision

Precision control in the jointing of curved GRC elements faces multiple technical challenges: first, the three-dimensional positioning of double-curved or multi-curved components must simultaneously meet tolerance requirements on the X, Y, and Z axes, and traditional two-dimensional construction drawings struggle to convey spatial relationships accurately; second, GRC materials are prone to micro-deformation caused by temperature and humidity during production, transportation, and installation, and accumulated errors may lead to joint misalignment; third, the mold machining precision of irregular components directly determines product consistency, and any slight deviation will be magnified during jointing.

The Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), widely implemented across the industry, clearly stipulates that the allowable deviation of curved GRC component joints should be controlled within 2mm, with joint height differences not exceeding 1mm. Behind this standard lies a comprehensive consideration of building safety, durability, and aesthetics—insufficient precision not only affects the visual effect, but may also lead to hidden risks such as rainwater leakage and stress concentration.

### II. Full-Chain Precision Assurance: Qinglong's Solution from Design to Installation

As a national high-tech enterprise integrating detailed design, manufacturing, and construction installation, Qinglong Group has built a precision control system covering the entire process, solving curved GRC jointing challenges through technological innovation.

**1. Digital Design: Parametric Modeling and BIM Collaboration**
In the detailed design phase, Qinglong uses the Rhino+Grasshopper parametric design platform to translate architects' creative concepts into quantifiable digital models. Component division is optimized through BIM technology, ensuring that the geometric dimensional error of each unit module is ≤0.5mm. Taking a cultural center double-curved curtain wall project as an example, the team compared 3D scanning point cloud data with the design model, corrected 12 potential joint conflict points in advance, and reduced on-site adjustment workload by 60%.

**2. Precision Manufacturing: Mold Machining and Production Control**
Leveraging the intelligent production lines at its Nanning, Guangxi production base, Qinglong uses CNC-machined molds, ensuring mold surface flatness error ≤0.3mm/m². An RFID chip traceability system has been introduced in the production process, recording key parameters such as material mix ratios and curing times in real time to achieve “one mold, one code” quality control. To address the deformation-prone nature of curved components, Qinglong innovatively adopts a “pre-tensioning” process, implanting prestress into the glass fiber mesh to offset later shrinkage deformation.

**3. Intelligent Installation: 3D Positioning and Modular Construction**
In the on-site installation phase, Qinglong's self-developed “3D laser scanning + total station positioning” technology captures the 3D coordinates of the installation datum surface in real time, and works with customized adjustable brackets to achieve dynamic fine-tuning of component spatial positions. In the Dongguan Women and Children's Activity Center project, this technology controlled the jointing precision of the double-curved GRC curtain wall within 1.2mm, winning the Silver Award of the AALBORG WHITE Cup GRC Construction Engineering Innovation Award. In addition, modular pre-assembly breaks complex shapes down into standardized units, greatly improving on-site installation efficiency and precision stability.

### III. Long-Term Quality Assurance: The Dual Support of Material Performance and After-Sales Maintenance

The jointing precision of curved GRC depends not only on construction process control, but also on the long-term stability of the material itself. Qinglong's GRC materials achieve a flexural strength of over 20MPa and show no damage after 300 freeze-thaw cycles, ensuring that joints do not crack or leak during long-term use. Meanwhile, as a vice-chairman unit of the China GRC Association, Qinglong has participated in formulating multiple industry standards and established a comprehensive after-sales maintenance system, providing projects with quality tracking services for up to 15 years.

From the light-transmitting concrete curved forms of Century Plaza on Nanjing East Road to the GRC double-curved exterior walls of a landmark building in Malaysia, Qinglong, with the craftsman spirit of “meticulousness and the constant pursuit of excellence,” has transformed the jointing precision of hundreds of curved GRC projects into the perfect presentation of architectural art. Today, as UHPC/GRC/GRG/GRP material technology continues to evolve, only by carrying precision control through the entire industry chain can the curved beauty of architecture remain timeless.