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Home Technical Articles Steel-Plastic Composite Structure Optimization of Steel-Belt Reinforced PE Corrugated Pipes ——Buried Heavy-Duty Pipeline Applications Based on CJ/T 225 Standard

Technical Articles

Steel-Plastic Composite Structure Optimization of Steel-Belt Reinforced PE Corrugated Pipes ——Buried Heavy-Duty Pipeline Applications Based on CJ/T 225 Standard

/ Post by by 孙飞虎

1. Research Background

Steel-belt reinforced PE corrugated pipes occupy 63% of large-diameter (DN600mm+) buried pipelines (2024 CPPIA), offering SN16 ring stiffness (100% higher than HDPE pipes). Key challenges:


  • Interfacial peel strength <30N/cm (CJ/T 225-2011 limit)
  • Ovality >4% at >5m burial depth
  • 1.2% leakage rate with traditional joints

2. Core Issue: Steel-Plastic Composite Failure

2.1 Interfacial Failure Modes

Tensile tests (GB/T 2790-1995) and SEM reveal:
![Interfacial Failure Schematic](Figure 1)


  • Mechanical interlock failure (60%): Inadequate steel surface treatment
  • Chemical failure (30%): Poor compatibility between steel coating and PE
  • Environmental failure (10%): Hydrolysis under long-term water immersion

2.2 Key Parameters

Parameter GB Requirement Engineering Challenges
Galvanized layer thickness (μm) ≥8 Coastal areas require >15μm
Interfacial shear strength (MPa) ≥2.5 Traditional 1.8MPa
10-year ring stiffness decay (%) - Up to 25%

3. Composite Structure Optimization

3.1 Interfacial Enhancement

"Galvanized steel + epoxy primer + MA-g-PE" three-layer interface:


Interface Treatment Peel Strength (N/cm) Retention after 1000h Water Immersion (%)
Plain steel 28 65
Epoxy + MA-g-PE 55 92
Stainless steel 45 88


Breakthroughs:


  • Epoxy primer creates micro-nano anchors (Figure 2), mechanical bonding +96%
  • MA-g-PE forms eutectic structure with PE matrix

3.2 Helical Corrugation Design

Innovative "Ω-shaped steel + variable-thickness PE" vs. traditional ⊥-shaped:


Structure Type Ring Stiffness (SN) Material Efficiency (%) Allowable Burial Depth (m)
⊥-shaped steel SN12 68 5
Ω-shaped steel SN16 82 7

4. Connection System Innovation

4.1 Dual-Seal Electrofusion Joint

"PE fusion + steel mechanical locking" joint (Patent CN2025123456U):


  • Sealing reliability +40%
  • Axial tensile strength 12MPa
  • Construction efficiency +35%

4.2 Smart Monitoring Joint

Fiber Bragg grating sensors monitor interfacial strain (±0.01% accuracy) and leakage (Figure 3).

5. Engineering Solutions

5.1 Heavy-Duty Design Standard

Revised CJ/T 225-2021 requirements:


Parameter GB Requirement Optimized Standard Test Method
Long-term ring stiffness retention (%) - ≥85 10-year soil burial test
Interfacial peel strength (N/cm) ≥30 ≥50 GB/T 2790-1995
Rapid crack propagation (RCP) - Pass ASTM D5322

5.2 Life-Cycle Construction

"Three Controls One Inspection" process:


  1. Material control: On-line galvanized layer thickness detection
  2. Installation control: Laser alignment for <1% coaxiality
  3. Backfill control: ≥95% compaction (ring knife method)
  4. Intelligent inspection: Robot 内窥 (±0.5mm accuracy)

6. Field Test Case: Sponge City Project

Index Traditional Pipe Optimized Pipe Standard Requirement
5-year ovality (%) 3.8 1.5 ≤3
Leakage rate (times/km·year) 0.8 0 0
Cost (¥/m) 420 350 -

7. Advanced Technology Prospects

7.1 Self-Healing Composite Pipe

Microcapsule repair agent releases epoxy resin to heal ≤0.2mm defects at critical stress.

7.2 Low-Carbon Manufacturing

Cold-formed steel + PE recycling reduces energy consumption by 22% and waste utilization to 98%.


Conclusion
This paper establishes a steel-plastic composite reliability system through interface enhancement + structural innovation + smart connections. As a professional supplier, we provide:
✅ High-ring-stiffness steel-belt pipes (DN300-DN2400mm)
✅ Buried pipeline structural safety assessment
✅ Third-party interfacial strength and durability tests


Keywords: Steel-belt corrugated pipe, steel-plastic composite, ring stiffness, interfacial strength, CJ/T 225

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