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

The connection joints of building components are like the joints of the human body—their quality directly affects the safety and durability of the entire structure. In the application of new decorative materials such as UHPC, GRC, GRG, and GRP, the standardized treatment of screw hole edge reinforcement is often overlooked, yet it may become an "invisible killer" that triggers hidden engineering hazards. As Qinglong Group, with 28 years of deep industry experience, we draw on full-chain technical expertise to provide you with an in-depth analysis of the importance of this key process and its solutions.

Four Major Risk Hazards of Insufficient Screw Hole Edge Reinforcement

During the installation of UHPC/GRC/GRG/GRP components, failure to scientifically reinforce screw hole edges will cause uneven material stress and stress concentration. In mild cases, fine cracks appear and affect aesthetics; in severe cases, anchoring failure occurs. Especially at critical locations such as exterior wall cladding panels of high-rise buildings and special-shaped GRG ceilings, this may cause safety accidents involving component detachment. A landmark project once saw cracking at three locations because the screw hole edges of its GRC curtain wall panels were not fiber-reinforced under wind pressure loads, and the later rectification cost reached as high as 15% of the original construction cost.

Through the analysis of 100+ typical cases, Qinglong's technical team found that non-standard reinforcement also leads to reduced waterproofing performance. Rainwater penetrates through gaps at the hole edges into the structure, accelerating steel corrosion; in hot and humid environments, this can shorten the service life of GRP components by 30%. In addition, non-standard reinforcement treatment causes the attenuation of screw fastening force, resulting in abnormal noise and displacement in GRG ceilings, affecting the building's acoustic performance and user experience.

Material Property-Oriented Reinforcement Solutions

For different material properties, Qinglong has established a differentiated reinforcement standard system. For UHPC components, the "embedded metal sleeve + circumferential fiber weaving" process is adopted, leveraging their ultra-high compressive strength (≥150MPa) and CNC precision machining to ensure hole edge wall thickness deviation of ≤0.5mm. In a cultural center project in Nanjing, this process increased the pull-out resistance of UHPC sunshade panels by 40% and passed Category 12 typhoon wind load testing.

For GRC materials, the innovative "double-helix glass fiber bundle + interface agent impregnation" technology is applied, raising the chopped glass fiber content to 8%. Third-party testing shows that the flexural strength at the hole edges reaches 22MPa, far exceeding the industry standard requirement of 15MPa. The automated molding lines at Qinglong's production base enable precise material placement in reinforcement areas, ensuring that the standard deviation of screw hole edge strength for each GRC component is controlled within 3%.

For GRG and GRP components, the "gypsum-based reinforcement slurry" and "resin thickening layer" processes are used respectively. Especially in GRP daylighting roof applications, by embedding glass fiber reinforcement rings, the tensile strength around screw holes reaches 180MPa, successfully solving the cracking problem of traditional processes under deformation caused by temperature differences.

Full-Chain Quality Control System

As a national high-tech enterprise, Qinglong has established a full-process control mechanism from design to maintenance. During the detailed design stage, BIM technology is used to simulate stress on hole positions, avoiding stress concentration risks in advance; in production, German-imported CNC drilling equipment ensures hole position accuracy with errors of ≤0.3mm; during construction and installation, dedicated torque wrenches are equipped to achieve standardized control of pre-tightening force.

Through 28 years of technical accumulation, Qinglong has participated in formulating multiple industry standards such as the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC), and has incorporated the screw hole edge reinforcement process into its corporate standardization manual. At its 600,000-square-meter production bases nationwide, every batch of components must pass hole edge pull-out resistance tests, with data uploaded in real time to a blockchain quality traceability system, ensuring full traceability.

Building safety is no small matter—true craftsmanship shows in the details. With the craftsman spirit of "meticulous attention and constant pursuit of excellence," Qinglong Group brings key processes such as screw hole edge reinforcement to perfection, providing designers and owners with UHPC/GRC/GRG/GRP system solutions that combine aesthetic appeal with structural safety. Choose Qinglong, a manufacturer with 28 years of full-chain experience, and let every connection joint become a solid guarantee of building quality.