Analysis of Mold-Parting Principles and Key Technical Points for Complex GRC Shapes

In contemporary architectural design, complex GRC shapes have become the "finishing touch" of landmark buildings thanks to their unique artistic expressiveness. However, the scientific rigor of the mold parting process directly determines the forming quality of components and construction efficiency. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group will provide designers and engineering parties with systematic solutions covering both mold parting principles and key technologies.

I. Core Principles of Mold Parting for Complex GRC Shapes

Mold parting design is the "soul process" of GRC component production and must balance three dimensions: structural mechanics, material properties, and aesthetic presentation. Qinglong Group consistently follows the "Three Principles" during the detailed design stage: first, "modular splitting," which breaks down oversized irregular components into standard units of ≤1.5m×3m—for example, the hyperbolic curtain wall of a grand theater was split into 128 rhombic modules, ensuring mold versatility while reducing transportation and installation difficulty; second, "force optimization," which uses BIM simulation to analyze stress concentration areas and positions parting lines at locations with lower shear force—for example, 45° oblique parting is adopted for curved components with curvature ≥15°, making glass fiber distribution more uniform; third, "process adaptation," which applies "positive-negative mold combination + core-pulling process" to openwork relief GRC components, successfully achieving openwork patterns with 0.5mm precision on a museum's facade.

II. Four Key Technical Points of the Mold Parting Process

1. Parametric Mold Parting Technology: Based on the Rhino and Grasshopper platforms, Qinglong's R&D team developed a dedicated GRC mold parting algorithm that automatically generates parting schemes meeting "minimum curvature radius ≥300mm" and "joint seam error ≤2mm". In a commercial complex project in Nanjing, this technology increased the mold parting efficiency of a 1200㎡ double-curved GRC skin by 40% and reduced mold costs by 25%.

2. Mold Material Innovation: The "GRP composite mold" developed for complex shapes combines the rigidity of steel molds with the flexibility of silicone molds, achieving dimensional accuracy of ±0.3mm. In a cultural center project in Guangzhou, twisted GRC columns 3m in height produced with this mold achieved a surface flatness of 0.5mm/m, far exceeding industry standards.

3. Parting Seam Treatment Process: The original "stepped rabbet joint + elastic sealing" technology sets a rabbet structure 5mm wide and 3mm deep on the parting surface, combined with a dedicated GRC repair mortar, improving seam concealment by 90%. This process has been successfully applied to the fish-scale GRC curtain wall of a landmark project in Malaysia, achieving a visual effect of "seamless up close, unified from afar".

4. Digital Pre-assembly Technology: 3D laser scanning is used to capture the actual dimensions of components, and parting accuracy verification is completed in a virtual space. In a science museum project in Shenzhen, Qinglong used this technology to detect 37 parting errors in advance, avoiding on-site rework losses of over one million RMB.

As a national high-tech enterprise and a drafting unit of GRC industry standards, Qinglong Group has always taken "creating beautiful architecture" as its mission, integrating mold parting process innovation into full-cycle project services. From the irregular GRC curtain wall of the Dongguan Women and Children's Activity Center to the translucent concrete project at Century Plaza on Nanjing East Road, Qinglong has proven with 28 years of technical accumulation that a scientific mold parting scheme is the key bridge leading complex GRC shapes from design drawings to perfect realization. In the future, Qinglong will continue to explore the boundaries of mold parting technology for UHPC/GRC/GRG/GRP materials, providing designers with greater creative freedom and contributing more artistic components that are "exquisite in both form and spirit" to the construction industry.