Analysis of Splicing Precision Requirements and Construction Control Points for Curved GRC Shapes

In contemporary architectural design, curved GRC forms, with their unique artistic expressiveness and structural advantages, have become the finishing touch of high-end projects such as grand theaters, convention centers, and landmark buildings. However, their complex spatial geometry places stringent demands on jointing precision, and even millimeter-level errors during construction can affect the overall visual effect and structural safety. As an industry leader with 28 years of experience in detailed design, manufacturing, and construction of UHPC/GRC/GRG/GRP materials, Qinglong Group has developed a systematic solution for controlling the jointing precision of curved GRC forms, drawing on full-chain technical expertise covering material properties, digital design, and on-site management.

I. Core Indicators of Jointing Precision for Curved GRC Forms and Industry Challenges

The jointing precision of curved GRC forms directly affects the integrity and durability of the building skin. The prevailing industry standard requires planar jointing errors of ≤2mm, curvature deviation of ≤3mm/m, and joint flatness of ≤1mm. These requirements are far more stringent than for ordinary GRC components, mainly due to three challenges: first, the mathematical modeling of curved geometry is difficult, and traditional 2D drawings can hardly convey spatial curvature information accurately; second, GRC materials undergo slight shrinkage during production and curing, which may cause dimensional deviations in precast components; third, 3D positioning during on-site installation is significantly affected by factors such as ambient temperature and settlement of the base structure. For example, in a double-curved GRC curtain wall project at a cultural center, failure to control jointing errors in the early stage resulted in visual distortion after completion, with rectification costs increasing by 30%.

II. Full-Chain Precision Control: Qinglong's Solution from Design to Construction

Leveraging the technical strength of its national-level R&D center, Qinglong Group has built a trinity precision control system of "digital design – precision manufacturing – intelligent installation." In the design phase, a Rhino+Grasshopper parametric platform is used to establish digital models of curved surfaces, with BIM technology applied for clash detection and pre-assembly simulation, controlling shape errors at the design source. In production, automated mold engraving equipment ensures mold surface precision errors of ≤0.5mm, and a dual-stage process of "steam curing + natural curing" keeps the shrinkage rate of GRC components stable within 0.03%. During construction and installation, 3D laser scanning technology is used for real-time positioning, combined with custom adjustable supports to achieve millimeter-level precision calibration. This process was successfully applied in the translucent concrete project at Century Plaza on Nanjing East Road, achieving seamless jointing of 1,200 irregular GRC components and winning the Silver Award of the AALBORG WHITE Cup UHPC Construction Engineering Innovation Award.

III. Construction Control Essentials: Technical Breakthroughs in Key Processes

The construction of curved GRC forms requires strict control of three core processes: first, surveying and setting out—a Leica TS60 total station is used to establish a 3D control network, with one reference control point set every 50㎡ to ensure a unified overall coordinate system; second, component transportation and storage—custom curved brackets are used to prevent deformation, and on-site storage time does not exceed 72 hours; third, joint treatment—a dual waterproofing system of "elastic sealant + backing foam rods" is adopted, and the surface is finely leveled with specialized repair mortar to ensure a natural transition between joints and curved surfaces. In the Dongguan Women and Children's Activity Center project, Qinglong Group raised the jointing pass rate of a 3,000㎡ double-curved GRC ceiling to 99.8% through these processes, far exceeding the industry average.

IV. Industry Experience and Standards Leadership: Qinglong's Technical Expertise and Responsibility

As a contributing unit to the Technical Standard for Building Applications of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), Qinglong Group has integrated its 28 years of practical experience into standard setting and proposed the concept of "three-level precision control for curved GRC forms": Level 1 control (factory prefabrication), Level 2 control (on-site jointing), and Level 3 control (completion acceptance). Meanwhile, it has built technical barriers through 58 patented technologies, such as the patent for "an adjustable installation joint for curved GRC components," which solves the difficulty of traditional installation methods in adapting to fine adjustments on curved surfaces. To date, Qinglong's curved GRC technology has served more than 500 landmark projects at home and abroad—from the European-style curved decoration of Xinghewan Real Estate in China to the irregular curtain walls of the Petronas Twin Towers in Malaysia—all demonstrating outstanding precision control capabilities.

Jointing precision control of curved GRC forms is a comprehensive embodiment of materials science, digital technology, and engineering management. Guided by its mission of "creating aesthetically beautiful architecture," Qinglong Group continuously advances industry technology through full-chain innovation and rigorous quality control, providing reliable support for designers to bring their creative visions to life and delivering buildings that combine artistic value with engineering quality for owners. In the future, as UHPC/GRC composite technology develops, the precision control of curved forms will reach new dimensions, and Qinglong will continue to lead innovation in the new building decoration materials industry with its attitude of "meticulous precision and the constant pursuit of excellence."