Analysis of the Proportion of Mold Cost in Total Cost of Hollowed-Out UHPC Shapes and Discussion of Influencing Factors

In the interplay between UHPC architectural aesthetics and cost control, molds are both the cornerstone of artistic realization and the key fulcrum of cost balance.

With modern architecture's pursuit of sculptural forms and artistic expression, openwork UHPC (Ultra-High Performance Concrete) designs, with their advantages of light weight, high strength, and flexible shaping, have become a new favorite of landmark buildings and high-end projects. However, the mold cost of such products often becomes the focal point of project cost control. As an industry leader with 28 years of deep expertise in the UHPC/GRC/GRG/GRP materials field, Qinglong Group has found through practice on hundreds of complex projects that the mold cost of openwork UHPC designs typically accounts for 15%-35% of the total project cost, with fluctuations influenced by multiple factors such as design complexity, production scale, and process selection, requiring refined management from a whole-chain perspective.

I. Composition and Proportion Analysis of Mold Costs for Openwork UHPC Designs

The mold cost of openwork UHPC designs mainly covers four modules: design and development fees, material procurement fees, processing and fabrication fees, and maintenance and turnover fees. Taking an openwork curtain wall project for a cultural center undertaken by Qinglong Group as an example, its mold cost accounted for 28%, of which the processing fee for customized steel molds was the highest, reaching 45% of the total cost, followed by 3D scanning and parametric design fees at about 20%. Compared with conventional flat-panel UHPC components, openwork designs require mold precision to be improved by more than 30% due to the need to achieve complex textures, curved surfaces, and see-through structures, resulting in a cost proportion significantly higher than that of ordinary components (usually 8%-15%).

II. Key Factors Affecting Openwork UHPC Mold Costs

1. Design Complexity: The Conversion Cost from “Drawing to Reality”
The density of openwork patterns, the curvature of surfaces, and the minimum aperture size directly determine the difficulty of the mold process. When the openwork ratio exceeds 40% or line precision requirements reach ±0.5mm, a five-axis machining center must be used to produce steel molds, with costs 3-5 times higher than conventional wooden molds. Through BIM technology and Rhino parametric design, Qinglong Group can shorten the mold development cycle for complex designs by 20%, indirectly reducing time costs.

2. Production Scale: Cost Amortization under Economies of Scale
The production quantity of molds for the same design is key to cost control. When the order volume exceeds 50 pieces, the unit amortized mold cost can be reduced by 40%. For example, for openwork UHPC sunshades produced in batches by Qinglong for a commercial complex, standardized modular design raised the mold reuse rate to 85%, effectively compressing the cost proportion from 32% to 22%.

3. Material and Process Selection: Balancing Performance and Economy
The choice of mold material must balance durability and cost. Wooden molds suit small-batch, low-precision designs, costing only 1/5 of steel molds, but their lifespan usually does not exceed 10 uses; steel molds, despite high initial investment, can be reused more than 50 times, making them suitable for large-batch projects. In a landmark project in Malaysia, Qinglong innovatively adopted a composite mold of “steel frame + epoxy resin lining”, which met the requirement of 30 turnovers while reducing material costs by 25%.

III. Qinglong Group's Mold Cost Optimization Practices

As a national high-tech enterprise and UHPC standard-setting unit, Qinglong Group has achieved refined mold cost management through three major initiatives: first, establishing a mold sharing database that classifies and archives over 2,000 mold design solutions from past projects, achieving a 60% reuse rate for new projects; second, introducing 3D printing rapid prototyping technology, shortening the prototyping cycle of irregular molds from 15 days to 3 days and saving 30% of development costs; third, implementing integrated “design-production-construction” services, optimizing openwork structures in advance at the detailed design stage to avoid later mold rework. For example, in the translucent concrete project of Century Plaza on Nanjing East Road, structural optimization kept the mold cost proportion within 20%, winning the first UHPC Construction Engineering Innovation Award.

The mold cost control of openwork UHPC designs is essentially the art of balancing artistic pursuit with engineering economy. Supported by 28 years of whole-chain experience, Qinglong Group transforms mold costs into a core competitive advantage of its products through technological innovation and management optimization. In the future, with the development of modular design and intelligent construction technologies, openwork UHPC designs are expected to further lower the mold cost threshold while maintaining artistic expressiveness, promoting the widespread application of this high-end material across more architectural fields.