Views: 221 Author: Site Editor Publish Time: 2025-06-26 Origin: Site
In the field of bridge engineering, life is not only a time scale, but also a double promise of safety and economy. Due to fatigue cracking, corrosion failure, and other problems, the actual service life of traditional steel bridge structures is often lower than the design expectation of 17. Through three core breakthroughs in material innovation, anti-fatigue technology, and intelligent monitoring system, our activity bridge can extend the design life to more than 50 years and achieve a performance degradation rate of less than 30% to 46% of the industry average throughout the cycle. The following analyzes this industry-leading life insurance system from the perspective of technical logic and empirical data.
High-strength weather-resistant steel system
Q690 grade high-strength low alloy steel (tensile strength 690 MPa, 50% higher than ordinary steel)1, surface composite nano-ceramic coating, corrosion rate in salt fog environment reduced to 0.01 mm/year (industry average 0.05 mm/year)5.
The key nodes are reinforced with gradient reinforcement steel, the surface hardness is increased by 30%, the fatigue resistance is extended by 2 times, and the limit load of 120 tons/m (the national standard requires 80 tons/m) has passed the third-party inspection. 16.
Breakthrough in welding technology
Introducing automated double-sided welding technology, the weld penetration rate is ≥75%, eliminating traditional welding porosity and slag defects, and the weld strength is 40% to 6% higher than that of single-sided welding.
Case: After applying this technology, the cracking rate of welds on the Wuhan Dongkou Yangtze River Bridge decreased by 90%.
Residual stress elimination technology
Independent research and development of "annealing process + gradient temperature control" technology, through "heating - insulation - cooling" precise control (temperature ± 5 ℃, time error < 1 minute), release weld residual stress of more than 85%, fatigue life increased by 72% 34.
Comparative experiment: traditional bridge life span of 50 years vs. this technology's bridge life span of 82 years.
Dynamic load adaptability design
Based on the structural stress method, optimize the intersection nodes of the longitudinal rib and the top plate and the transverse diaphragm, and reduce the stress amplitude by 35% ~ 6%.
Empirical data: After the application of Xianxin Road Bridge, the occurrence rate of fatigue cracks on the bridge deck is zero, and the maintenance cost is reduced by 60%.
Intelligent monitoring system
Deploy an AIoT sensor network to monitor 12 parameters in real time, including strain, vibration, corrosion rate, etc., and use machine learning to predict remaining life (error rate < 8%) 59.
Case: A bridge in a mine was detected 3 months in advance through the system warning, avoiding a sudden collapse loss of 9.
Preventive maintenance program
Maintenance strategy: Level I (daily): monthly cleaning + coating repair (3 hours per bridge)
Level II (annual): cathodic protection system calibration + structural health assessment
Level 3 (5-year cycle): Key node replacement (cost reduction of 45% compared to traditional maintenance) 910
Environmental protection coating technology: water-based fluorocarbon paint + cathodic electrophoresis primer, single coating life of 15 years, VOC emissions ≤ 50g / L (national standard limit of 120g / L).
IV. Industry certification and empirical memorization
Authoritative certification
ISO 12934 corrosion protection certification, American AASHTO fatigue load standard 6.
Recognized as Jiangsu Province's "Four New Technologies" and China Construction Group's "Science and Technology Innovation Gold Award".
