How to Control Jointing Precision of Multi-Curved UHPC Forms — Research on Key Technologies and Practical Pathways

How to Control the Jointing Precision of Multi-Curved UHPC Shapes — Research on Key Technologies and Practical Paths

Driven jointly by contemporary architectural aesthetics and engineering technology, ultra-high performance concrete (UHPC) has become the core material for shaping complex architectural forms, thanks to its outstanding mechanical properties and design freedom. However, controlling the jointing precision of multi-curved UHPC components has always been a technical challenge in the industry, directly affecting the integrity of the building envelope and structural safety. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group has built a systematic precision control solution through the deep integration of detailed design, intelligent manufacturing, and digital construction.

1. Digital Design: The Source of Precision for Multi-Curved UHPC Shapes

Precision control of multi-curved UHPC shapes must start from the design source. Relying on the R&D strength of its provincial-level engineering technology center, Qinglong Group uses a parametric design platform (Rhino+Grasshopper) to build 3D digital models, breaking architectural curved surfaces down into quantifiable geometric units. BIM technology enables seamless connection of design, production, and construction data, ensuring that the spatial coordinate error of each component is controlled within ±2mm. Taking the translucent concrete project of the Nanjing East Road Century Plaza renovation as an example, its double-curved panels adopted a zoned grid design, with cumulative errors eliminated through 1:1 digital pre-assembly, ultimately achieving precise docking of more than 3,000 special-shaped components. The project won the Silver Award of the first AALBORG WHITE Cup UHPC Architectural Engineering Innovation Award.

2. Intelligent Manufacturing: Dual Precision Assurance from Molds and Materials

As a national high-tech enterprise, Qinglong Group has established intelligent production lines at its production base in Nanning, Guangxi. For multi-curved UHPC components, CNC-machined steel molds or fiberglass reinforced plastic (GRP) molds are used, ensuring that the 3D precision error of the molds themselves is ≤0.5mm/m. In terms of material mix proportion, patented technology (Invention Patent ZL202110XXXXXX.X) is applied to optimize the workability and volume stability of UHPC, keeping shrinkage deformation caused by hydration heat within 0.03%. An RFID chip traceability system is introduced during production to record the production parameters of each component in real time, providing data support for subsequent installation.

3. Digital Construction: Full-Process Control from Pre-Assembly to On-Site Installation

On-site installation is the key link in the jointing precision of multi-curved UHPC shapes. Qinglong Group uses 3D laser scanning technology to digitally survey the installation base surfaces, generating point cloud models that are compared with design models to correct structural deviations in advance. For super-large components (each weighing up to 5 tons), modular lifting tooling has been developed and combined with a real-time posture monitoring system to achieve millimeter-level positioning accuracy. In the Dongguan Women and Children's Activity Center project, through the "offline pre-assembly + on-site fine adjustment" process, the jointing gaps of 1,200 GRC/UHPC composite components were controlled within 3mm, winning the Silver Award of the first AALBORG WHITE Cup GRC Architectural Engineering Innovation Award.

4. Full Life-Cycle Service: The Qinglong Brand's Precision Commitment

As a vice-chairman unit of the China GRC Association, Qinglong Group has established a full-chain service system covering detailed design, production and manufacturing, construction and installation, and after-sales maintenance. For multi-curved UHPC projects, it provides a warranty commitment of up to 15 years, ensuring long-term stability of jointing precision through regular 3D scanning inspection and maintenance. The industry standard "General Technical Conditions for Non-Load-Bearing Ultra-High Performance Concrete (UHPC) Components" (Plan No. 2024-0232T-JC), which the company participated in formulating, incorporates the above precision control technologies into the specification, driving the industry's technological upgrade.

From the double-curved curtain walls of landmark buildings to the special-shaped decorations of cultural venues, controlling the jointing precision of multi-curved UHPC shapes is both a technical challenge and a reflection of a company's comprehensive strength. Building on 28 years of professional accumulation, Qinglong Group continues to provide designers and owners with expert-level solutions for "creating aesthetic architecture" through digital and intelligent technological innovation, embodying the brand commitment of "meticulous craftsmanship and constant pursuit of excellence" and steadily advancing toward the vision of "becoming an outstanding UHPC/GRC/GRG/GRP manufacturing leader in the world."