Analysis of Problems Caused by Non-Standard Reinforcement Around Screw Holes in Components and Countermeasures

The connection safety of building components is the lifeline of engineering quality, and screw hole edge reinforcement treatment, as a key link in the connection system, directly affects the structural safety and durability of a project depending on whether it meets standards. In the application of new decorative materials such as UHPC, GRC, GRG, and GRP, non-standard screw hole edge reinforcement processes can become hidden engineering hazards. As Qinglong Group with 28 years of detailed design and construction experience, we combine full-chain service practice to provide an in-depth analysis of the hazards of this issue and its systematic solutions.

1. Four Core Hazards of Non-Standard Screw Hole Edge Reinforcement

In the installation of UHPC/GRC/GRG/GRP components, the absence or non-standard application of screw hole edge reinforcement treatment can trigger a chain of consequences. The first is structural load-bearing risk: when reinforcement measures are insufficient, the material around screw holes is prone to stress concentration, which may lead to cracking under long-term loads, especially evident in brittle materials like GRG. A landmark project once suffered localized tearing and leakage because the screw holes of its GRC exterior wall panels were not fiber-reinforced, with later rectification costs reaching as high as 30% of the original construction cost.

The second is durability degradation: unreinforced screw hole edges will accelerate material aging under environmental factors such as temperature and humidity changes and freeze-thaw cycles. Qinglong's technical team found in Southeast Asian project research that GRP components without standard hole edge reinforcement have a service life more than 40% shorter than similar products with standardized treatment. In addition, installation accuracy deviation is also a common problem: insufficient hole edge reinforcement causes micro-deformation during screw tightening, affecting the flatness of component assembly. For high-precision materials like UHPC in particular, this can result in dual defects in both visual appearance and structural performance.

2. Technical Root Causes Behind Industry Pain Points

The screw hole edge treatment problems currently existing in the industry essentially reflect insufficient matching between material properties and construction techniques. Although UHPC material has a strength exceeding 150MPa, stress concentration areas such as screw holes still require strengthening through processes like oriented steel fiber distribution; GRC requires ensuring that the glass fiber volume content within 30mm of the hole edge is no less than 5%; GRG, due to its gypsum-based substrate characteristics, must use specialized resin reinforcement rings; while GRP components require composite reinforcement through embedded metal sleeves and fiber cloth. The absence of these technical details often stems from contractors' insufficient understanding of material properties or simplified processes to cut costs.

3. Practical Path of Qinglong's Full-Chain Solutions

As a national-level high-tech enterprise, Qinglong Group has established a standardized treatment system from design to maintenance. In the detailed design phase, BIM technology is used to simulate the stress state of screw holes, with customized reinforcement solutions for different material properties: UHPC components adopt three-dimensional reinforcement + embedded steel sleeve processes, GRC implements gradient fiber reinforcement at hole edges, GRG uses annular wrapping with glass fiber cloth, and GRP adopts integrated molding of embedded metal inserts with resin matrix. In the production phase, automated molds ensure precise forming of hole edge reinforcement areas; in the construction phase, specialized torque wrenches control fastening force; and in after-sales maintenance, a hole edge stress monitoring database is established.

This system has been validated in benchmark projects such as the Nanjing East Road Century Plaza renovation project and the Dongguan Women and Children's Activity Center. Taking light-transmitting UHPC components as an example, through hole edge reinforcement process optimization, their pull-out resistance increased by 60%, with installation accuracy controlled within ±0.5mm, winning the Silver Award of the First UHPC Construction Engineering Innovation Award. The "General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC)", which Qinglong participated in formulating, further incorporates hole edge reinforcement technology into industry standards, driving technological upgrades across the entire industry chain.

No detail is too small when it comes to building safety, and the refined treatment of screw hole edges is a microcosm that reflects engineering quality. With 28 years of professional expertise, Qinglong Group deeply integrates material properties, structural mechanics, and construction techniques, and through full-chain control of "design-production-construction-maintenance", provides designers and owners with expert-level solutions from technical consultation to implementation. Choosing a supplier with full industry chain capabilities is the key to avoiding such hazards and achieving the unity of architectural aesthetics and structural safety.