Mold Splitting Principles and Practical Application Analysis for Complex GRC Shapes

Analysis of Mold Parting Principles and Practical Applications for Complex GRC Shapes: Creating a Balance Between Architectural Aesthetics and Engineering Realization

In contemporary architectural design, GRC (Glass Fiber Reinforced Concrete) has become the core material for realizing complex building skins and artistic components thanks to its lightweight, high-strength and shape-flexible properties. However, the more unconventional the GRC shape, the more it tests a manufacturer's technical expertise in mold parting—this not only affects production efficiency and cost control, but also directly determines whether design creativity can be accurately realized. As an industry veteran with 28 years of full-chain experience in UHPC/GRC/GRG/GRP, Qinglong Group has accumulated systematic mold parting solutions across more than a thousand landmark projects. From principle analysis to real-world cases, this article provides an in-depth breakdown of the mold parting logic behind complex GRC shapes.

I. The Underlying Logic of Mold Parting Design: Deconstructing Artistic Shapes with Engineering Thinking

Mold parting for complex GRC shapes is not simple "cutting", but systematic planning based on material properties, production processes and installation logic. The core principles include:

1. Structural Safety First: Mold parting must keep the weight of each individual component within hoisting limits (usually ≤500kg), while preventing slender structures from developing stress concentration during demolding. For example, for the hyperbolic curtain wall of a grand theater, a 12-meter-high shape was divided into 6 gradually transitioning components, which both met hoisting requirements and eliminated installation errors through a concave-convex interlocking groove design.

2. Preserving Shape Integrity: For artistic designs such as streamlined forms and openwork reliefs, parting seams must be hidden in visually subdued areas. In the Dongguan Women and Children's Activity Center project, Qinglong adopted "virtual parting line" technology, aligning the parting seams with the direction of the building's texture, ultimately achieving a seamless visual effect for a 1200㎡ hyperbolic GRC skin.

3. Balancing Production Feasibility: The parting plan must match mold turnover efficiency and avoid overly complex single-mold designs. Take the free-form overhanging eaves of a commercial complex as an example: through modular parting, 8 types of special cross-sections were optimized into 3 combinations of standard modules, reducing mold costs by 40% and shortening the production cycle by 25 days.

II. Technological Breakthroughs in Mold Parting: From Parametric Design to Intelligent Manufacturing

Traditional mold parting relies on experience-based judgment, whereas modern GRC parting has entered the digital era. Leveraging the technical strengths of its provincial-level R&D center, Qinglong has built a full-process system of "3D scanning—parametric parting—BIM collaboration":

• Parametric Mold Parting Technology: Using the Rhino+Grasshopper platform, designers' curved-surface models are converted into producible component units, automatically generating the optimal parting plan. In an openwork relief wall project for a museum, the algorithm automatically divided the wall into 132 components, improving parting efficiency by 80% while ensuring uniform glass fiber distribution in every component.

• Collaborative Mold Design: Mold structural design is carried out concurrently at the parting stage, adopting a combination of adjustable steel molds and flexible silicone molds to solve the demolding challenges of complex shapes. For the twisted ribbon shape of a Guangzhou landmark project, a 0.5° demolding draft angle was pre-set during parting, achieving a mold reuse rate of 90%.

III. Real-World Case: How Parting Plans Determine Project Success or Failure

For the "origami"-shaped GRC curtain wall of a cultural center project in Nanjing, the original design called for integral casting, but its excessive self-weight posed installation risks. After Qinglong became involved, the project was successfully realized through the following parting optimizations:

1. Force-Analysis-Driven Parting: Using finite element simulation, the 18m-span origami shape was divided into 12 triangular units connected by concealed steel structural frames, keeping each component's weight within 350kg.

2. Seam Process Innovation: Parting seams were treated with a dual "tongue-and-groove joint + sealant" approach, with surfaces finished to match the surrounding texture and color. Final 3D scanning inspection showed flatness deviation at the seams of ≤2mm.

3. Full-Cycle Cost Control: The parting plan reduced mold costs by 35%, improved transportation efficiency by 50%, and saved nearly 2 million RMB in overall construction costs.

IV. Industry Value of Mold Parting Technology: From "Producible" to "Optimally Produced"

As a participating drafting unit of the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC), Qinglong believes that an excellent parting plan is the key to maximizing the value of GRC materials. It not only solves the question of "whether it can be done", but also achieves "how to do it better"—on the premise of guaranteeing design effects, scientific parting reduces overall costs by 30%-50% and shortens production cycles by 20%-40%. This is also one of the core competencies that enable Qinglong to establish strategic partnerships with leading real estate enterprises such as Poly and China Overseas.

The art of mold parting for complex GRC shapes is, in essence, a balance between engineering rationality and design sensibility. Looking ahead, as UHPC/GRC/GRG/GRP materials see deeper application in building skins, parting technology will develop toward intelligence and sustainability—optimizing parting plans through AI algorithms and combining them with 3D-printed mold technology to achieve "zero-waste" production. Qinglong will continue to uphold its mission of "creating aesthetic architecture", pushing forward the technical boundaries and application possibilities of new decorative materials.