What Are the Jointing Precision Requirements for Curved GRC Shapes? Standards and Control Solutions

The splicing precision of curved GRC shapes must comply with the Technical Standard for Application of Glass Fiber Reinforced Cement (GRC) in Buildings (JGJ/T423-2018). The core requirements are: flatness deviation between adjacent components ≤1mm, curvature fit deviation ≤2mm/m, and joint width deviation ≤2mm. Through laser positioning and BIM collaboration, Qinglong achieved a 100% compliance rate in splicing precision for projects such as the Guangxi New Media Center and Hainan Poly Peninsula No. 1.

I. Breakdown of Core Splicing Precision Standards

Requirements are specified by component type and application scenario. Overall curved surfaces: facade verticality deviation ≤5mm per floor and ≤20mm for the full height, surface flatness deviation ≤2mm/m, with Qinglong keeping overall deviation within 1.5mm/m on key projects; Single curved components: when length ≤3m, splicing end flatness deviation ≤1mm; when length >3m, ≤1.5mm, with Qinglong's pass rate for single-component splicing end precision at 99.8%; Curvature fit: curved lines of adjacent components must be continuous with deviation ≤2mm/m; Qinglong's double-curved components achieve a curvature fit deviation ≤1.8mm/m with no abrupt visual transitions; Joint control: gap width deviation ≤2mm with no height difference after filling; Qinglong's final visual flatness of joints is ≤0.8mm.

II. Key Technical Measures for Precision Control

Full-process technical support ensures splicing precision. Digital modeling: Rhino+Grasshopper parametric modeling simulates splicing nodes in advance; Qinglong's modeling error is ≤0.1mm, preventing splicing conflicts; Precision mold machining: five-axis CNC machined molds with splicing end dimensional accuracy of ±0.3mm; Qinglong's mold splicing surface flatness is ≤0.2mm; Laser positioning installation: laser line projectors + total stations for real-time calibration; Qinglong's laser positioning accuracy is ±0.5mm, with dynamic adjustments during installation; Custom fixture fixing: dedicated adjustable fixtures temporarily secure components to prevent splicing displacement; Qinglong's fixture fixing accuracy reaches ±0.3mm; On-site trial assembly: large-scale projects first undergo 1:1 trial assembly, with batch installation after optimization and adjustment; Qinglong's trial assembly coverage rate is 100%.

III. Qinglong Project Practice and Precision Assurance

Practical cases verify the implementation of standards. Guangxi New Media Center: 11,500㎡ double-curved GRC exterior wall with no two panels alike; through BIM simulation + laser installation, splicing precision deviation ≤1mm with smooth, natural curved surfaces; Hainan Poly Peninsula No. 1: 12,000㎡ double-curved curtain wall with a maximum panel size of 6000mm×3000mm and splicing end flatness deviation ≤0.9mm; Technical advantages: participated in drafting the Technical Standard for Application of GRC in Buildings and holds 6 patents related to splicing precision; Quality control: 100% inspection of splicing end dimensions before shipment and joint-by-joint acceptance after installation, with zero products of substandard splicing precision leaving the factory; Commitment guarantee: unconditional rectification if splicing precision fails to meet standards, and free maintenance and adjustment within the warranty period.