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Home Technical Articles Multi-Hole Structure Optimization and Cable-Drawing Efficiency of PVC-U 9-Hole Pipes ——Telecom Pipeline Applications Based on YD/T 841.1 Standard

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Multi-Hole Structure Optimization and Cable-Drawing Efficiency of PVC-U 9-Hole Pipes ——Telecom Pipeline Applications Based on YD/T 841.1 Standard

0 Comments / / Post by by 孙飞虎

1. Research Background


PVC-U 9-hole pipes for telecom optical cables face conflicts between cable-drawing efficiency and compressive strength in their multi-hole design:


  • Traditional pipes (Figure 1) have <70% single-hole pass rate and 15% cable damage rate
  • Multi-holes reduce ring stiffness to SN4, insufficient for >2m burial depth

2. Core Issue: Multi-Hole Performance Conflict

2.1 Parameter Conflicts


Parameter Cable-Drawing Requirement Structural Requirement Traditional Conflict
Hole diameter (mm) ≥32 (for 48-core cables) ≤35 (wall thickness) Common 33mm causes thin walls
Hole spacing (mm) Close arrangement ≥5mm (stress relief) Traditional 3mm leads to cracks
Wall thickness (mm) Thinner for cost savings ≥3.0 (compression) Regular 2.5mm fails

2.2 Cable-Drawing Resistance


Cable traction tests (YD/T 1113-2015) show resistance sources:


  • Wall friction (62%): Ra=1.2μm
  • Bend resistance (28%): R<10D
  • Hole interference (10%): Cable squeezing

3. Multi-Hole Structure Optimization

3.1 Orthogonal Test Design


Optimizing hole diameter (A), spacing (B), thickness (C) for dn110mm pipes:


Scheme Hole Diameter (mm) Spacing (mm) Thickness (mm) Ring Stiffness (kN/m²) Traction Force (N) Weight (kg/m)
A 32 5 3.0 5.2 185 4.8
B 33 6 3.2 6.8 152 5.1 (Optimal)
C 34 7 3.5 7.5 168 5.5


Breakthroughs:


  • Hexagonal hole arrangement (Figure 2) for uniform spacing
  • 33mm holes fit 30mm cable diameter

3.2 Inner Wall Drag Reduction


Nano-TiO₂ coating vs. plain pipes:


  • Roughness reduced to Ra=0.6μm
  • Friction coefficient from 0.32 to 0.21
  • Efficiency +28%

4. Engineering Solutions

4.1 Telecom Pipeline Standard


Based on YD/T 841.1-2016:


Parameter GB Requirement Optimized Standard Test Method
Single-hole pass rate (%) ≥60% ≥85% Cable traction test
Flattening deformation (%) ≤10% ≤5% GB/T 8804.2-2003
Long-term weathering (years) 10 15 Xenon arc aging test

4.2 Cable-Drawing Process


"Three Coatings One Guide" method:


  1. Silicone lubricant (friction <0.15)
  2. Water-based anti-friction agent on cables
  3. Rotary 牵引 head for bend resistance

5. Field Test Case: Telecom Network Project


Index Traditional Pipe Optimized Pipe Standard Requirement
Single-hole drawing time (s) 45 28 -
Cable damage rate (%) 12 3 ≤5
5-year ring stiffness retention (%) 65 82 ≥60

6. Advanced Technology Prospects

6.1 Smart Variable-Diameter Pipe


Shape memory polymer expands holes to 35mm during drawing, then returns to 33mm, reducing resistance by 40%.

6.2 Self-Lubricating Microchannels


Micro-injection molding creates nano-lubrication grooves for permanent drag reduction without coatings.


Conclusion
This paper resolves conflicts through multi-hole optimization + drag reduction + construction processes. As a professional supplier, we provide:
✅ Custom telecom 9-hole pipes (dn75-dn160mm)
✅ Cable-drawing resistance simulation
✅ Third-party telecom pipeline testing


Keywords: PVC-U 9-hole pipe, multi-hole structure, cable-drawing efficiency, telecom pipeline, YD/T 841
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