Analysis of Assembly Precision Requirements and Construction Control Points for Curved GRC Shapes

Analysis of Splicing Precision Requirements and Key Construction Control Points for Curved GRC Forms

In contemporary architectural design, curved GRC (Glass Fiber Reinforced Concrete), with its outstanding forming capability and structural performance, has become a key material for shaping architectural artistry and modern aesthetics. However, the splicing precision of curved GRC forms directly determines the integrity and safety of a building's appearance, and its construction control is a systematic project that integrates material properties, engineering technology, and management experience. As an industry expert with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group, drawing on practical experience from hundreds of landmark projects, presents the industry with a full-process solution for curved GRC splicing—from precision standards and process control to quality assurance.

I. Core Standards for Curved GRC Splicing Precision: From Millimeter-Level Tolerance to Structural Stability

The splicing precision of curved GRC is not a single-dimensional parameter but a comprehensive indicator covering geometric dimensions, structural loading, and visual effects. In accordance with the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018) and Qinglong's in-house quality control system, which exceeds national standards, splicing precision must meet three core requirements: first, the geometric deviation of individual components must be controlled within ±2mm, and the curvature radius error of double-curved forms must not exceed 3‰; second, flatness at joints must be ≤1mm/m and joint width ≤3mm to ensure that rainwater does not penetrate and stress concentration is avoided; third, the three-dimensional coordinate deviation of the overall form must be ≤5mm to guarantee coordinated installation with other systems such as steel structures and curtain walls. Take the Nanjing Road East Century Plaza renovation project as an example: the splicing error between its translucent concrete and curved GRC was controlled within 1.2mm, achieving a "seamless connection" visual effect, and the project won the Silver Award of the First UHPC Construction Engineering Innovation Award, AALBORG WHITE Cup.

II. Key Construction Control Points: A Practical Path of Full-Process Refined Management

The splicing precision of curved GRC relies on technical coordination across the entire "design—production—installation" chain. In the detailed design phase, Qinglong adopts BIM + parametric design technology (such as the Rhino and Grasshopper platforms) to convert architectural curved surfaces into quantifiable digital models, and uses finite element analysis to simulate the stress state of splicing joints, preemptively avoiding precision deviations caused by material shrinkage or thermal deformation. In manufacturing, relying on the annual production capacity of 600,000 square meters at its production base in Nanning, Guangxi, Qinglong employs automated mold forming and steam curing processes to keep component dimensional deviation within ±1mm, and applies three-dimensional scanning technology to give each component an "identity code," enabling full life-cycle traceability.

On-site installation is the critical stage of precision control. Qinglong's original "3D laser positioning + modular hoisting" process establishes a spatial coordinate system with a Leica TS60 total station, comparing the design model with the on-site structure in real time, with adjustments controlled within 3mm. For complex forms such as double-curved surfaces, a three-step method of "pre-assembly—fine adjustment—fixing" is adopted: 1:1 pre-assembly is completed at the factory and error compensation values are marked; millimeter-level adjustments are made on site with adjustable supports; finally, the components are rigidly fixed to the main structure with stainless steel connectors to ensure long-term stability. For example, in a grand theater project, Qinglong's team used this process to keep the overall splicing error of more than 5,000 curved GRC components within 4mm, perfectly presenting the "flowing facade" effect envisioned by the architect.

III. Quality Assurance System: From Technological Innovation to Industry Standard Leadership

As a National High-Tech Enterprise and a participant in drafting the industry standard General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC), Qinglong Group has established a full-dimensional quality assurance system covering materials, processes, and management. At the material level, high-purity quartz sand and alkali-resistant glass fiber are used to ensure GRC components achieve a flexural strength of ≥20MPa and frost resistance of ≥300 freeze-thaw cycles; at the process level, RFID chip implantation technology has been introduced to monitor component production time, curing parameters, and installation positions in real time; at the management level, a three-level acceptance system of "project manager—technical director—quality inspector" is implemented, with key nodes verified by third-party testing institutions. In addition, Qinglong provides after-sales maintenance services for up to 15 years, safeguarding the long-term safety of curved GRC forms through regular inspections and structural health monitoring.

The splicing precision of curved GRC is not only a technical issue but also a dual test of architectural aesthetics and engineering strength. Backed by 28 years of full-chain experience, Qinglong Group, through the deep integration of digital design, precision manufacturing, and intelligent installation, transforms "millimeter-level precision" into the perfect presentation of architectural art. Looking ahead, as UHPC/GRC/GRG/GRP materials find wider application in high-end construction, Qinglong will continue to drive technological innovation, providing designers and owners with "one-stop" solutions from concept to completion, fulfilling its corporate mission of "creating beautiful architecture."