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Home Technical Articles Prefabricated Structure Optimization and Intelligent Operation of Municipal Inspection Wells ——Buried Pipeline Engineering Applications Based on GB/T 23483 Standard

Technical Articles

Prefabricated Structure Optimization and Intelligent Operation of Municipal Inspection Wells ——Buried Pipeline Engineering Applications Based on GB/T 23483 Standard

/ Post by by 孙飞虎

1. Research Background

Inspection wells are critical nodes in urban underground pipelines, with 41% disease rate in 5 years for traditional brick wells:


  • ＞30mm settlement (62% of failures)
  • ＞2.5% leakage (GB/T 50268-2022 limit 1%)
  • ＜35% manual inspection coverage

2. Core Issue: Failure Mechanisms

2.1 Structural Mechanics

ABAQUS simulation (Figure 1) and field tests show:


  • 0.85MPa shear stress under vehicle load (asphalt tensile strength 0.5MPa)
  • 40% more displacement with <90% backfill compaction
  • 1:3 stiffness ratio between brick and concrete

2.2 Construction Pain Points

Process Traditional Issues Impact
Excavation >50% over-excavation ★★★★☆
Joint treatment >15% grout leakage ★★★★☆
Backfill <92% compaction with small machines ★★★★☆

3. Prefabricated Structure Innovation

3.1 Steel-Plastic Composite Wells

"HDPE base + Q235 steel belt" composite:


Material Type Ring Stiffness (kN/m²) Acid-Alkali Life (years) Construction Time (days/unit)
Brick well 6 15 5
Cast-in-place concrete 8 20 7
Steel-plastic composite 12 30 2


Breakthroughs:


  • Steel belts form 3D support framework (Figure 2), deformation resistance +50%
  • HDPE 导流槽 reduces head loss by 38%

3.2 Prefabricated RC Wells

Tongue-and-groove joint + prestressed rods for collapsible loess:


Joint Type Shear Strength (MPa) Leakage (L/24h) Allowable Settlement (mm)
Plain joint 1.2 1.5 ±10
Tongue-and-groove 2.8 0.6 ±5

4. Intelligent Operation System

4.1 Multi-Parameter Sensor

5-in-1 sensor (Figure 3) monitors:


  • Water level (±2mm)
  • Methane (0-100%LEL)
  • Manhole cover displacement (±0.1mm)
  • Settlement (±0.5mm)
  • Temperature/humidity (±1℃/±3%RH)

4.2 Digital Twin Platform

BIM+IoT enables:


  • 3D visualization of pipeline network
  • 5-level alarm system (e.g., red alert at >1.5m water level)
  • 10-second fault dispatch

5. Engineering Solutions

5.1 Construction Standard

Revised GB/T 23483-2021 requirements:


Parameter GB Requirement Optimized Standard Test Method
Backfill compaction (%) ≥90 95 Ring knife method
Joint leakage rate (%) ≤1.0 0.5 Water tightness test
Monitoring coverage (%) - 100 IoT platform

5.2 Standardized Process

"Three Controls Two Inspections":


  1. Survey control: <±5mm positioning
  2. Lifting control: >60° angle, <0.3% verticality
  3. Backfill control: Impact rolling instead of vibration
  4. Joint inspection: Robot 内窥 (±0.5mm accuracy)
  5. Load test: 10t vehicle 碾压无沉降

6. Field Test Case: Sponge City Project

Index Traditional Well Prefabricated Well Standard Requirement
5-year settlement (%) 4.2 1.1 ≤3
Annual repairs 2.3 0 0
Maintenance cost (¥/unit·year) 800 300 -

7. Advanced Technology Prospects

7.1 Self-Sensing Composite Wells

Carbon nanotube sensors enable self-diagnosis with 0.1% damage detection accuracy.

7.2 Low-Carbon Prefabrication

Recycled aggregate + 3D printing reduces carbon emissions by 40% and waste utilization to 95%.


Conclusion
This paper provides a lifecycle solution for inspection wells through prefabricated innovation + intelligent monitoring. As a professional supplier, we offer:
✅ Steel-plastic/RC prefabricated wells (DN700-DN2000mm)
✅ Customized monitoring systems
✅ Third-party safety and leakage tests


Keywords: Inspection well, prefabricated structure, intelligent monitoring, surrounding diseases, GB/T 23483

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