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| Diameter (mm) | Dimensions D×L (mm) | Weight (t) | Cutter disk | Steering Cylinder (kN × set) | Internal pipe (mm) | ||
|---|---|---|---|---|---|---|---|
| Power (kW×set) | Torque (Kn·m) | rpm | |||||
| NPD 800 | 1020×3400 | 5 | 75×2 | 48 | 4.5 | 260×4 | 50 |
| NPD 1000 | 1220×3600 | 6.5 | 15×2 | 100 | 3.0 | 420×4 | 50 |
| NPD 1200 | 1460×4000 | 8 | 15×2 | 100 | 3.0 | 420×4 | so |
| N PD 1350 | 1660×4000 | 10 | 22×2 | 150 | 2.8 | 600×4 | 50 |
| NPD 1500 | 1820×4000 | 14 | 30×2 | 150 | 2.8 | 800×4 | 70 |
| NPD 1650 | 2000×4200 | 16 | 30×2 | 250 | 2.35 | 800×4 | 70 |
| NPD 1800 | 2180×4200 | 24 | 30×3 | 300 | 2 | 1000×4 | 70 |
| NPD 2000 | 2420×4200 | 30 | 30×4 | 400 | 1.5 | 1000×4 | 80 |
| NPD 2200 | 2660×4500 | 35 | 30×4 | 500 | 1.5 | 800×8 | 80 |
| NPD 2400 | 2900×4800 | 40 | 37×4 | 600 | 1.5 | 1000×4 | 80 |
| NPD 2600 | 3140×5000 | 48 | 37×4 | 1000 | 1.2 | 1200×8 | 100 |
The NPD series pipe jacking machine is mainly suitable for geological conditions with high groundwater pressure and high soil permeability coefficient. The excavated slag is pumped out of the tunnel in the form of mud through the mud pump, so it has the characteristics of high working efficiency and a clean working environment.
According to the different ways of controlling the mud on the excavation surface, the NPD series pipe jacking machine can be divided into two types: direct control type and indirect control type (air pressure composite control type).
Safe Tunneling Technology in Heterogeneous Ground
Soft soils, heterogeneous formations (sand, gravel, high permeability and high water pressure)
The direct control type pipe jacking machine can control the working pressure of the mud water tank by adjusting the speed of the mud pump or adjusting the opening of the mud water control valve. This control method is simple and convenient, and the failure rate is low.
The indirect control pipe jacking machine indirectly adjusts the working pressure of the muddy water tank by changing the pressure of the air cushion tank. This control method has a sensitive response and high control accuracy.
1. Precise Support: The automatic control air cushion provides precise support for the tunnel face, ensuring driving safety.
2. High Pressure Capacity: Tunneling can be performed efficiently even when water pressure exceeds 15bar.
3. Pressure Balancing: Mud balances formation pressure on the excavation surface, and slag is discharged via the mud conveying system.
4. High Stability: Ideal for tunnel construction with high water pressure and strict ground settlement requirements.
5. Dual Balance Modes: High driving efficiency, safe and reliable with direct and indirect control options.
6. Advanced Cutter Head: Advanced and reliable cutter head design equipped with efficient mud circulation.
7. Robust Main Drive: Adopts reliable main bearings, main drive seals, and main drive reducers for a long service life.
8. Self-Developed Control: Self-developed software control system ensures safe operation and user convenience.
9. Versatile Ground Suitability: Wide applicable to soft soil, clay, sand, gravel soil, hard soil, backfill, etc.
10. Independent Systems: Equipped with independent water injection and discharge systems.
11. Fast Drive Speed: Reaches a maximum driving speed of nearly 200mm per minute.
12. High Precision Steering: Supports steering adjustment up, down, left, and right with a maximum angle of 5.5 degrees.
13. Central Control: Integrated central control system on the ground is safe, intuitive, and convenient.
14. Tailored Solutions: A series of tailor-made configurations can be provided based on project requirements.
