Problems Caused by Non-Standard Reinforcement Around Screw Holes in Components and Their Solutions

Details determine safety, and standards forge quality—whether the screw hole edge reinforcement process is standardized or not directly affects the structural safety and service life of UHPC/GRC/GRG/GRP components.

In the field of architectural decoration, new materials such as UHPC (Ultra-High Performance Concrete), GRC (Glass Fiber Reinforced Concrete), GRG (Glass Fiber Reinforced Gypsum), and GRP (Glass Reinforced Plastic, commonly known as fiberglass) are widely used in high-end projects such as grand theaters, commercial complexes, and landmark buildings, thanks to their advantages of light weight, high strength, and flexible shaping. However, during the installation of such components, the non-standardized screw hole edge reinforcement process is becoming a hidden risk affecting project quality. Qinglong Group, with 28 years of full-chain experience in detailed design, manufacturing, and construction installation, will provide professional analysis for designers and owners from three aspects: root causes, potential hazards, and solutions.

I. Typical Problems and Hazards of Non-Standard Screw Hole Edge Reinforcement

As the key node connecting components to the main structure, the reinforcement treatment of materials around screw holes directly affects anchoring strength. In actual projects, common non-standard practices include: discontinuous laying of reinforcement materials, fiber direction inconsistent with the load direction, and imbalanced mix ratios of cementitious materials. These problems may lead to three major risks: first, local stress concentration in materials around the hole, causing cracking or damage—especially in high-strength materials like UHPC, where micro cracks may spread rapidly; second, insufficient anchoring force, causing components to loosen or even fall off under loads such as wind pressure and vibration, posing a threat to public safety; third, moisture penetration through gaps around the hole, accelerating internal rebar corrosion or moisture regain in GRG materials, shortening component service life. In one commercial complex project, glass fiber mesh was not embedded around the screw holes of GRC curtain wall panels according to standards, resulting in more than 20 panels loosening within one year after delivery, with rework costs as high as one million yuan.

II. Standardized Reinforcement Process: Full-Process Control from Materials to Construction

To address the above problems, Qinglong Group, drawing on its experience in participating in the formulation of industry standards such as the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), proposes systematic solutions. At the material level, suitable reinforcement schemes are selected according to component type: UHPC components use composite reinforcement of steel fibers and ultra-fine silica fume to ensure compressive strength around the hole edge ≥120MPa; for GRC/GRP, bidirectional glass fiber mesh must be laid within 50mm of the hole edge, with fiber content no less than 5%; GRG components, due to the characteristics of their gypsum substrate, require additional epoxy resin impregnation treatment at the hole edge to improve flexural strength. In the production stage, BIM technology is used for pre-positioning of screw hole locations, and integrated mold forming ensures precise laying of reinforcement materials. During construction, the four-step process of “drilling-dust cleaning-rebar planting-curing” is strictly executed, and torque wrenches are used to control screw tightening force, preventing hole edge cracking caused by over-tightening.

III. Qinglong Full-Chain Service: Quality Assurance from Design to Maintenance

As a national high-tech enterprise and a “specialized, refined, distinctive, and innovative” enterprise, Qinglong Group has incorporated the screw hole edge reinforcement process into its full-chain quality control system. During the detailed design stage, engineers customize reinforcement schemes based on project loads and environmental parameters (e.g., salt spray corrosion must be considered in coastal areas); during production, intelligent production lines with an annual capacity of 600,000 square meters achieve standardized operations, and RFID chips are used to trace the reinforcement process data of each component; during installation, professional teams equipped with 3D laser scanning positioning ensure hole position deviation ≤2mm; in the after-sales maintenance stage, regular inspection services lasting up to 10 years are provided to promptly identify and address hole edge aging issues. This closed-loop service of “design-production-construction-maintenance” has been verified in benchmark projects such as the translucent concrete project at Century Plaza on Nanjing East Road and the Dongguan Women and Children's Activity Center, with related technical achievements receiving multiple industry recognitions including the Huaxia Award.

The safety and beauty of a building lie in the standards of every detail. Though small, the screw hole edge reinforcement process is the “last line of defense” for the safety of UHPC/GRC/GRG/GRP components. With 28 years of professional expertise, Qinglong Group integrates its commitment to “meticulousness and excellence” into every process step, safeguarding designers' creativity and building worry-free projects for owners. Choosing standardized processes means choosing the lasting vitality of buildings.