What is the dimensional deviation control standard for UHPC components?

Dimensional deviation control of UHPC components is a key indicator of manufacturing quality. Qinglong Group's internal control standards are stricter than national specifications and are mainly divided into three categories: "overall dimensions, flatness, and positional tolerance." Based on industry standards such as JGJ/T 423-2018 and combined with 28 years of production experience, Qinglong controls the length and width deviation of conventional UHPC panels within ±1.5mm/m (maximum ±3mm), thickness deviation within ±1mm, flatness deviation ≤2mm/2m, and diagonal difference ≤3mm. In the Pingshan High-tech Zone Comprehensive Service Center in Shenzhen (a Luban Award project), through full-process precision management, we kept the cumulative installation error of 30,000 square meters of GRC curtain wall panels within ±5mm, setting a new industry benchmark for precision. Precise dimensional control is the foundation for ensuring UHPC project quality.

Tolerance Control System for Length Dimensions

Qinglong sets tolerance standards by component size: for components with a length ≤1m, the tolerance is ±1mm; for 1-2m, ±1.5mm; for 2-3m, ±2mm; for >3m, ±3mm. This graded control ensures precision while avoiding over-processing. In production, laser rangefinders are used for 100% full inspection to ensure every panel meets dimensional requirements. In the Nanning Wuxiang China Resources MixC project, through strict dimensional control, we achieved uniform and consistent curtain wall joint widths, delivering a clean and aesthetically pleasing visual effect.

Fine Management of Shape and Positional Tolerances

Beyond the basic dimensions of length, width, and height, shape and positional tolerances are equally important. Qinglong strictly controls indicators such as panel surface flatness (≤2mm/2m), verticality (≤2mm/2m), and warpage (≤L/500). For shaped double-curved panels, profile precision control is also applied (deviation from the theoretical model ≤2mm). In the Wuhan Han Show Theater project, we used 3D scanning technology to conduct full-size inspection of each double-curved panel, ensuring that all 287 unique components could be precisely positioned.

Precise Positioning of Embedded Parts

Positional deviation of embedded parts directly affects installation quality. Qinglong requires embedded part center position deviation ≤2mm and elevation deviation ≤1mm. CNC machines are used to machine the positioning holes for embedded parts in molds, and special fixtures are used to secure the embedded parts, ensuring positional precision. In the large roofing system project of the Hainan International Convention and Exhibition Center, precise embedded part positioning laid the foundation for rapid installation.

Cumulative Error Control Strategy

For systems composed of multiple panels, cumulative error control is particularly critical. Qinglong adopts a "reference panel" system, using the first qualified panel as the benchmark and matching subsequent panels against it, thereby distributing cumulative errors across the joints. Meanwhile, temperature adjustment joints are incorporated into the installation design to absorb inevitable dimensional deviations, ensuring overall system precision.