How to Adjust the Connection Angle Between Double-Curved GRC Panels and Steel Structures? Flexible Design of Complex Three-Dimensional Spatial Joints

The connection between double-curved GRC panels and steel structures often faces the challenge of deviations between the theoretical design angles and the actual installation angles. These deviations arise from multiple factors, including steel structure construction tolerances, GRC panel production tolerances, and thermal deformation. Qinglong Group's core concept for solving this challenge is "overcoming rigidity with flexibility"—that is, designing a flexible connection joint system that allows three-dimensional adjustment to absorb and accommodate these deviations, achieving precise, reliable, and efficient connections.

We typically adopt "three-dimensionally adjustable cast steel fittings" or a "universal ball-hinge connection system" as the standard solution. This connection system consists of three main components: a base welded or bolted to the steel structure, an intermediate adapter with slotted holes and angle adjustment slots, and a component that finally secures the GRC embedded parts. By loosening specific bolts, the connection point can be translationally adjusted along the X, Y, and Z directions (typically ≥±10mm) and rotationally adjusted around two axes (≥±5°). This adjustability covers the vast majority of installation deviations that may occur on site.

In complex projects such as the "Red Lantern" Wuhan Han Show Theatre, we further applied BIM technology and digital measurement technology to guide the adjustments. Before installation, the actual point cloud model of the completed steel structure was obtained through 3D laser scanning and compared with the design BIM model to calculate the three-dimensional deviation between the theoretical and actual positions of each connection point. Based on these deviation values, the adjustment amounts of most adjustable connectors were preset in the factory, forming "prefabricated" installation packages. During on-site installation, workers only need to position the components and connectors according to their numbers and perform final fine-tuning and locking, greatly improving installation efficiency and precision.

Flexible connection design not only solves installation challenges but also safeguards long-term structural safety. It allows small relative displacements between GRC panels and the steel structure, thereby releasing the constraint stresses generated between the two by temperature changes, wind loads, or seismic action, and preventing the panel cracking or connector failure that rigid connections might cause. Qinglong Group's connection system is one of the key technologies ensuring the successful implementation of double-curved GRC curtain walls on complex steel structures.