Problems Caused by Non-Standard Reinforcement at Component Screw Hole Edges and Solutions

In the application of new architectural decoration materials such as UHPC, GRC, GRG, and GRP, the reinforcement treatment of screw hole edges in components is a critical link affecting structural safety and service life. As an industry leader with 28 years of experience in detailed design, manufacturing, and construction, Qinglong Group fully understands the decisive impact of standardized reinforcement processes on component performance. From the perspective of engineering practice, this article systematically analyzes the core problems caused by non-standard screw hole edge reinforcement, and provides professional solutions leveraging Qinglong's full-chain technical advantages.

### I. Three Major Hazards of Screw Hole Edge Reinforcement Defects

As load-bearing connection nodes between components and the main structure, screw holes will become weak points in building safety if the surrounding materials are not treated with standardized reinforcement. In actual projects, common problems manifest in three ways: first, cracking caused by stress concentration—when screws are tightened, unreinforced hole edge materials are prone to radial cracks due to excessive local pressure; especially in high-strength materials like UHPC, crack propagation may lead to overall structural instability; second, detachment risk caused by insufficient anchoring force—uneven fiber distribution around holes in fiber-reinforced materials such as GRC and GRG reduces screw grip strength, significantly increasing the probability of component detachment under long-term loads or vibration environments (such as subways and commercial complexes); third, accelerated durability degradation—rainwater and corrosive gases infiltrating through hole edge gaps cause internal steel bar corrosion or fiber aging, shortening component service life. A landmark project once suffered multiple leaks and structural deformation within just 3 years because the screw hole edges of its GRP daylighting roof lacked fiberglass mesh reinforcement, with later maintenance costs reaching as much as 40% of the initial construction cost. For more industry information: +WeChat qlfsbl123

### II. Technical Essentials of Standardized Reinforcement Processes

To address the above issues, Qinglong Group, based on the "Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC)" (JGJ/T423-2018) and the UHPC industry standards it helped formulate, has developed a full-process solution covering design, production, and testing. At the material level, customized reinforcement solutions are adopted according to differences in component types: UHPC components use pre-embedded metal sleeves combined with circumferential fiber densification technology, ensuring that hole edge compressive strength is increased to 1.5 times that of the base material; GRC/GRG components combine 3D woven fiberglass mesh with hole edge chamfer design to achieve crack resistance above 20MPa; GRP components innovatively adopt integrally formed fiberglass reinforcement rings, solving the problem of uneven fiber distribution caused by traditional hand lay-up. In the production process, Qinglong introduces BIM modeling and CNC precision drilling technology to keep hole position errors within ±0.5mm, combined with automated grouting equipment to achieve uniform filling of hole edge reinforcement materials.

### III. Practical Value of Full-Chain Quality Control

As a national high-tech enterprise and a drafter of multiple industry standards, Qinglong Group integrates screw hole edge reinforcement quality control into every stage of detailed design, manufacturing, and construction installation. During the design phase, engineers use finite element analysis software to simulate stress conditions around hole edges and optimize the reinforcement range and material ratios; during production, each batch of components undergoes hole edge pull-out force testing and may only leave the factory after meeting standards; during construction, standardized torque wrench operations are adopted, with the tightening data of every screw recorded and incorporated into the quality traceability system. This "design-production-construction" full-chain control model has enabled projects undertaken by Qinglong, such as the Nanjing East Road Century Plaza renovation project and the Dongguan Women and Children's Activity Center, to achieve an excellent record of zero cracking and zero leakage at screw hole edges, with component service life extended by more than 15 years beyond the industry average.

Although screw hole edge reinforcement is a detail process in component production, it directly relates to building safety and engineering quality. Supported by 28 years of professional experience, Qinglong Group has turned this "minor" process into a "solid defense line" safeguarding project quality through material innovation, process optimization, and full-process control. Going forward, Qinglong will continue to uphold the principle of "meticulousness and excellence," providing designers and owners with expert-level solutions from detailed design to after-sales maintenance, and promoting the high-quality application of UHPC/GRC/GRG/GRP materials in the field of architectural decoration. For more industry information: +WeChat qlfsbl123