How to Control Joint Precision in Multi-Curved UHPC Formworks: Key Technologies and Practical Paths

In contemporary architectural design, multi-curved UHPC forms have become the visual centerpiece of landmark buildings thanks to their unique artistic expressiveness and structural performance. However, controlling the joint precision of such complex forms has long been a recognized technical challenge in the industry. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group has built a complete multi-curved UHPC joint precision control system through collaborative innovation in detailed design, intelligent manufacturing, and precision construction, providing designers and owners with a full-process solution from concept to realization.

Joint precision control for multi-curved UHPC forms is first embodied in the "digital rehearsal" at the parametric design stage. Relying on its self-developed BIM collaboration platform, the Qinglong team converts three-dimensional models of architectural curved surfaces into quantifiable production data and uses parametric tools such as Grasshopper to mathematically decompose the forms. Taking a double-curved curtain wall project for a grand theater as an example, the technical team simulated with a 1:100 digital model to identify 37 potential joint error risk points in advance, and applied reverse engineering technology to optimize the joint angles, keeping the theoretical joint error within ±0.5mm. This "digital twin"-style detailed design capability is precisely Qinglong's core advantage in technology R&D as a national high-tech enterprise.

Millimeter-level control in the intelligent manufacturing stage is the key safeguard for precision control. The five-axis machining centers and automated casting systems at Qinglong's Guangxi production base achieve mold machining precision of ±0.1mm, far exceeding the industry average standard of ±1mm. In material formulation, a UHPC mix optimized through orthogonal testing keeps the shrinkage rate of components stably below 0.03%, reducing joint errors caused by material deformation at the source. For complex curved components, an innovative "modular pre-assembly" process completes three-dimensional positioning and adjustment in the factory, ensuring "ready-to-install" performance on site. This production model increased on-site jointing efficiency by 40% for a commercial complex project in Nanjing and reduced the rework rate to below 0.3%.

The "dynamic calibration" of precision construction technology forms the last line of defense for precision control. The Qinglong construction team uses Leica TS60 total stations for real-time three-dimensional coordinate acquisition, combined with its self-developed "surface fitting algorithm" to achieve millimeter-level dynamic adjustments during installation. In an airport terminal project, faced with the task of jointing 1,200 specially shaped UHPC sunshades, the team applied "zoned control + overall adjustment" technology to keep cumulative errors within 3mm, perfectly presenting the streamlined curved effect required by the design. Notably, the industry standard "General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC)", which Qinglong helped compile, is a systematic summary of such construction technical specifications.

From digital design to intelligent production and then to precision construction, Qinglong Group has solved the joint precision challenge of multi-curved UHPC forms with its full-chain technical advantages. As a vice-chairman unit of the China GRC Association and a member of the International GRC Association, Qinglong has always taken "creating beautiful architecture" as its mission, converting 28 years of engineering experience into replicable technical solutions. Whether it is the artistic curtain walls of landmark buildings or the specially shaped decorations of commercial spaces, Qinglong can provide solid technical support for designers to realize their creative ideas through the coordinated application of UHPC/GRC/GRG/GRP materials—a vivid practice of Qinglong's vision of "becoming an outstanding world-leading UHPC/GRC/GRG/GRP manufacturing enterprise."