Safety Hazards of Non-Standard Reinforcement Around Screw Hole Edges in Components and Countermeasures

In the application of new decorative building materials such as UHPC/GRC/GRG/GRP, the reinforcement treatment of screw hole edges in components is a critical link concerning structural safety and engineering quality. As a group with 28 years of experience in detailed design, manufacturing, and construction, Qinglong Group will deeply analyze the risks of non-standard screw hole edge reinforcement from the perspectives of material properties, causes of hidden dangers, and full-chain solutions, and share industry-leading technical response strategies.

I. Screw Hole Edge Reinforcement Defects: Hidden Safety Traps in New Building Material Applications

Materials such as UHPC, GRC, GRG, and GRP are widely used in scenarios like grand theaters, commercial complexes, and landmark buildings thanks to their advantages of light weight, high strength, and flexible shaping. However, screw holes, as the core load-bearing points of component installation, may trigger multiple hidden dangers when their reinforcement treatment is non-standard: first, GRC exterior wall panels may suffer rainwater penetration due to insufficient crack resistance around hole edges, accelerating corrosion of internal steel bars; second, under wind pressure loads, unreinforced screw holes in UHPC curtain wall components are prone to stress concentration, causing panel cracking; third, if the anchoring strength around hole edges of GRG ceiling systems is insufficient, there may be a risk of overall falling. A commercial landmark project once experienced local detachment under extreme weather because fibre reinforcement technology was not applied to the screw holes of its GRP daylighting roof, resulting in a serious safety accident.

II. Analysis of Root Causes: Full-Chain Examination from Material Properties to Construction Management

The emergence of screw hole edge reinforcement problems is essentially a neglect of material properties and construction specifications. Although UHPC material has a compressive strength of over 150MPa, stress concentration areas such as screw holes still require reinforcement through oriented arrangement of steel fibres; if GRC components adopt manual plastering technology, uneven distribution of glass fibres around hole edges easily forms weak points; the gypsum matrix of GRG material requires epoxy resin penetration treatment after drilling, otherwise powdering and flaking off are likely to occur. In addition, during construction, failure to perform hole edge pretreatment in accordance with Qinglong Group's "UHPC Component Installation Technical Regulations" and the selection of non-standard fasteners further amplify safety risks.

III. Qinglong's Full-Chain Solution: Dual Guarantee of Technological Innovation and Standard Implementation

As a national-level high-tech enterprise, Qinglong Group builds a safety defense line for screw hole edge reinforcement through three core measures: first, in the detailed design stage, BIM technology is used to simulate the stress state of screw holes, and a composite solution of "pre-embedded steel sleeve + fibre-reinforced ring" is adopted for UHPC components, increasing flexural strength by 40%; second, in the production stage, German-imported CNC drilling equipment is introduced to ensure the hole edge tolerance of GRC/GRP components is controlled within ±0.5mm, and automated spraying technology achieves 360° uniform distribution of glass fibres around hole edges; third, during construction and installation, a three-step standard process of "hole edge grinding - epoxy resin soaking - stainless steel bolt implantation" is executed, with dedicated torque wrenches to ensure anchoring force meets standards.

IV. Leading Industry Standards: Upgrade Path from Enterprise Specifications to National Guidelines

As a participating editor of the "Technical Standard for Building Application of Glass Fibre Reinforced Cement (GRC)" (JGJ/T423-2018), Qinglong Group has incorporated screw hole edge reinforcement technology into its enterprise standards and promoted it as an industry norm. In the renovation project of Century Plaza on Nanjing East Road, Qinglong's self-developed UHPC translucent concrete components, through hole edge reinforcement treatment, successfully withstood the test of Force 12 typhoon loads and won the AALBORG WHITE Cup UHPC Construction Engineering Innovation Award. This technology not only ensured project safety but also set a benchmark for the refined application of new building materials.

Building safety is no trivial matter, and the detail treatment of screw hole edges demonstrates corporate strength. With 28 years of professional accumulation, Qinglong Group integrates its commitment of "meticulousness and excellence" into the production and installation of every component, providing designers and owners with full-chain safety guarantees from detailed design to after-sales maintenance. Choosing Qinglong means choosing to let innovative materials display architectural beauty on the premise of safety.