Sidebar
Categories
Recent Articles
-
Zhengju Steel-lined Composite Pipe Case Study and Q&A: Pipe Selection under Continuous High Corrosion Conditions June 08, 2026
-
Zhengju New Materials Successfully Delivers Custom Dual-Pipe Network Solution for North China Mining Project June 02, 2026
-
Zhengju New Materials Successfully Delivered the UHMWPE Pipe System for the G217 Expressway Tunnel Project May 25, 2026
Customization
We can also customize products with different specifications, colors, uses, etc. according to your needs. Please contact us and provide your drawings for professional solutions and quotes.
Customization Service & Quote
Please contact our Key Account Manager, send your drawings and requirements to get professional solutions, accurate quotes and customized products.
Optimization of Anti-Leakage Structure and Construction Efficiency for Prefabricated Manholes ——Rapid Construction Technology Based on GB/T 23483 Standard
1. Research Background
Manholes are critical nodes in municipal pipe networks, responsible for pipe maintenance, water level monitoring, and stormwater collection. Traditional cast-in-place concrete manholes face three major challenges (Figure 1):
- Long construction 周期: 7-10 days per manhole, accounting for 35% of pipeline project time
- High leakage rate: 42% of pipeline defects from joint leakage (2024 MOHURD data)
- Poor durability: 65% crack incidence after 5 years
2. Core Issue: Failure Mechanism of Traditional Manholes
2.1 Failure Mode Analysis
| Failure Type | Cause | Typical Scenario |
|---|---|---|
| Joint Leakage | Shrinkage cracks + seal failure | Stormwater-sewage intersections |
| Settlement | Uneven foundation + low stiffness | Soft soil or heavy traffic areas |
| Material Corrosion | Chemical erosion by sewage/groundwater | Industrial parks, coastal areas |
2.2 Key Influencing Parameters
| Parameter | GB Requirement | Traditional Process Deviation |
|---|---|---|
| Wall thickness (mm) | ≥200 | 180-190 |
| Joint seal compression (%) | 15-25 | 8-12 |
| Foundation bearing capacity (kPa) | ≥100 | 60-80 |
3. Prefabrication Technology Optimization
3.1 Structural Design Innovation
Adopted "modular + tongue-and-groove" prefabrication (Figure 2), offering advantages over cast-in-place:
- Modular production: Precision ±2mm for 井筒，base, and 支管 joints
- Tongue-and-groove connection: Shear strength increased by 40%
- Variable stiffness design: 250mm upper wall (load zone), 200mm lower wall
3.2 Material Performance Comparison
| Material Type | Compressive Strength (MPa) | Waterproof Grade | Unit Weight (t) | Curing Time (d) |
|---|---|---|---|---|
| Cast-in-place C30 | 30 | P6 | 8.5 | 28 |
| Prefabricated steel-fiber concrete | 45 | P8 | 6.2 | 7 |
| Plastic manhole | 15 | P4 | 1.2 | 1 |
4. Engineering Solutions
4.1 Rapid Construction Standard
Developed "Three Speeds One Strictness" process (referencing CJJ/T 33-2016):
| Process | Traditional | Prefabricated | Efficiency Improvement |
|---|---|---|---|
| Foundation excavation | 2 days | 1 day | -50% |
| Manhole installation | 4 days | 6 hours | -83% |
| Joint sealing | 2 days | 4 hours | -80% |
| Backfilling | 2 days | 1 day | -50% |
4.2 Anti-Leakage System Design
"Three-Layer Defense" sealing system (Figure 3):
- Structural layer: Double rubber seals (20% compression)
- Additional layer: 2mm polyurea coating (tensile strength ≥15MPa)
- Testing layer: Water pressure 0.15MPa, leakage ≤0.05L/(m·min)
5. Field Test Case: Sponge City Project
| Index | Cast-in-Place | Prefabricated | Standard Requirement |
|---|---|---|---|
| Construction 周期 (days) | 9 | 2.5 | - |
| 5-year leakage rate (%) | 18 | 2 | ≤5 |
| Settlement (mm) | 35 | 8 | ≤15 |
| Comprehensive cost (¥10,000/unit) | 18 | 12 | - |
6. Future Technologies
6.1 3D-Printed Manholes
Using fiber-reinforced concrete 3D printing (Figure 4):
- Complex channel integration
- Material utilization increased to 95%
- Customized manholes delivered in 24 hours
6.2 Smart Manhole System
Integrated multi-parameter sensors for real-time monitoring of:
- Inclination angle (±0.1° accuracy)
- Water level/flow (0.01m resolution)
- Toxic gas alerts (H₂S, CH₄)
Conclusion
This paper solves manhole challenges through prefabrication + anti-leakage technology + smart monitoring. As a professional supplier, we provide:
✅ Full range of prefabricated manhole modules (φ700-φ2000mm)
✅ Rapid construction toolkits
✅ Manhole health monitoring cloud platform
This paper solves manhole challenges through prefabrication + anti-leakage technology + smart monitoring. As a professional supplier, we provide:
✅ Full range of prefabricated manhole modules (φ700-φ2000mm)
✅ Rapid construction toolkits
✅ Manhole health monitoring cloud platform
Keywords: Prefabricated manhole, anti-leakage structure, rapid construction, municipal pipeline, GB/T 23483