HomeTechnical ArticlesCorrosion Resistance and Joint Structure Optimization of Tunnel Escape Pipes ——Applications in Humid Environments Based on JT/T 722-2023 Standard
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Corrosion Resistance and Joint Structure Optimization of Tunnel Escape Pipes ——Applications in Humid Environments Based on JT/T 722-2023 Standard
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Post by by 孙飞虎
1. Research Background
Tunnel escape pipesinwater-rich, corrosive tunnelsface severe corrosion (Figure 1):
3-year rust depth in steel pipes reaches1.2mm(15% wall loss)
41% of failures fromelectrochemical corrosionat joints
Traditional coatings fail >60% within 5 years (GB/T 1766-2008)
2. Core Issue: Corrosion Mechanism
2.1 Corrosion Types
EISandsalt spray tests(GB/T 10125-2021) identify:
Corrosion Type
Cause
Typical Scenario
Uniform corrosion
Groundwater pH 5.5-6.5 + Cl⁻ >200mg/L
Limestone tunnels
Crevice corrosion
Liquid accumulation under seals
Pipe joints
Stress corrosion
Tensile stress >100MPa + corrosive media
Bends and supports
2.2 Joint Structure Defects
Joint Type
Traditional Design Flaw
Corrosion Risk
Welded joint
Weld HAZ corrosion resistance -30%
★★★★☆
Flange joint
Galvanic corrosion between bolts and 母材
★★★☆☆
Socket joint
Stress concentration from seal compression
★★☆☆☆
3. Corrosion-Resistant Materials
3.1 Stainless Steel Composite Plate
316L-Q235 composite plate(Figure 2) vs. pure steel:
Conclusion This paper addresses corrosion issues throughcorrosion-resistant materials + stress-free joints + anti-corrosion processes. As a professional supplier, we provide: ✅ Custom corrosion-resistant escape pipes (Φ600-Φ1200mm) ✅ Electrochemical corrosion test reports ✅ Tunnel anti-corrosion construction solutions
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