What Are the Dimensional Deviation Control Standards for UHPC Components? Precision Management and Qinglong Group's Tolerance System

Dimensional deviation control standards for UHPC components must be established in tiers according to "component type, installation location, and building grade", generally following the principle that "factory standards are stricter than national standards, and critical areas stricter than general areas". Qinglong Group's internal control standards are: length deviation ±2mm/2m, flatness ≤2mm/2m, thickness deviation ±1mm, and diagonal difference ≤3mm; whereas the national standard (JC/T 940) allows a deviation of ±3mm/2m. In the Wuhan Han Show Theater double-curved panel project, through CNC molds (precision ±0.1mm) and 3D scanning inspection, we kept the cumulative installation error of 9,000 shaped panels within ±5mm, achieving a perfect curved surface. Dimensional accuracy is a direct reflection of the industrialization level of UHPC.

Factory internal control standards are the cornerstone of quality

Qinglong Group classifies components into three precision grades: Grade A (critical visual areas) with deviation ±1.5mm, Grade B (general areas) ±2mm, and Grade C (concealed areas) ±3mm. Production lines are equipped with laser trackers for real-time correction of mold positions.

Inspection technology is the guarantee of control

Coordinate measuring machines (precision ±0.01mm) are used for sampling inspection, while large panels undergo 100% laser scanning inspection. In the Hainan Convention and Exhibition Center project, each panel carries a QR code, and scanning it reveals complete dimensional data.

Pre-control and compensation of installation errors

A 2mm installation adjustment allowance is reserved at the design stage; BIM pre-assembly is used to detect conflicts. Qinglong Group provides dedicated adjustment hangers that allow ±5mm on-site adjustment.

Precision control is a systematic engineering effort. Qinglong Group manages the entire process from design to installation digitally, ensuring components fit together seamlessly.