What Are the Construction Challenges of Zaha-Style GRC Forms? Technical Challenges and Solutions Under Non-Linear Aesthetics

The "Zaha-style" architectural style is renowned for its fluid, dynamic non-linear forms. When its skin is realized in GRC, it poses unprecedented challenges for construction. These difficulties can by no means be resolved through traditional experience alone; they run through the entire process of setting-out and positioning, component installation, and joint treatment. When Qinglong Group participated in an art center project of a similar style, facing seemingly "flowing" double-curved surfaces and sharply interweaving geometric lines, we identified three core construction challenges: precise three-dimensional spatial positioning, complex splicing of multi-curved components, and achieving both waterproofing and aesthetic unity at irregular interfaces.

Precise three-dimensional spatial positioning is the primary challenge. Traditional two-dimensional planar setting-out methods become completely ineffective. We adopted an approach combining "total station three-dimensional coordinate setting-out" with "on-site augmented reality (AR) assistance based on the BIM model". First, the design model is imported into the total station to establish tens of thousands of three-dimensional control points on the structure. Then, through AR glasses, technicians can overlay the virtual component models onto the actual spatial scene, directly guiding the installation position of each embedded part and transition piece, keeping spatial coordinate errors strictly within ±3mm. For irregularly twisted curved surfaces, we also fabricated three-dimensional positioning templates that fit perfectly with the inner surface of the components, ensuring 100% restoration of their spatial orientation.

The complex splicing of multi-curved components is the focal point of quality control. Every GRC component is unique, and its splicing boundaries are often spatial curves. We innovatively adopted a "six-degree-of-freedom adjustable connection system". Each connection point is no longer a simple bolted fixing, but a precision cast steel piece with three-dimensional translation and three-dimensional rotation adjustment functions. During installation, workers can fine-tune the six degrees of freedom of a component in space, much like adjusting a camera gimbal, until the gap with adjacent components evenly reaches the designed 4±1mm. After adjustment, the component is temporarily fixed with special clamps and subjected to an overall re-inspection, and only then are permanent welding and sealing carried out.

Waterproofing and aesthetic treatment of irregular interfaces tests the ultimate craftsmanship. At special locations such as sharp corners and convergence points, conventional adhesive joints cannot be applied. We jointly developed a highly elastic, paintable polyurethane sealant with our material supplier, with elongation of up to 400%, capable of accommodating complex deformations. Visually, we pursue a "see the joint, not the sealant" effect: after all adhesive joints are completed, professional technicians apply a spray finish of fluorocarbon paint matching the GRC color, making the joints blend seamlessly with the panel surfaces. Overcoming these difficulties requires not only advanced technical tools, but also a construction team that understands the design and possesses outstanding spatial imagination and craftsmanship, so that the breathtaking curves on paper can stand perfectly upon the earth.