Below is a clear technical overview based on typical tunnel construction practice.
1. What is a Double-Curved Boom?
A double-curved boom means the drilling boom has two articulated curved sections, allowing:
Wide coverage of tunnel face, side walls, and crown
Precise positioning of the rock drill at difficult angles
Reduced need to reposition the carrier
Compared with straight or single-curved booms, it offers much higher maneuverability.
2. Main Applications
✔ Tunnel face drilling
✔ Anchor bolt / rock bolt drilling
✔ Sidewall and crown drilling
✔ Hydropower tunnels, mines, traffic tunnels
✔ Medium and small tunnel cross-sections
3. Key Advantages
✅ High Flexibility
Covers top, bottom, and side walls easily
Suitable for complex tunnel profiles
✅ Accurate Drilling
Stable boom structure minimizes vibration
Improves hole straightness and depth accuracy
✅ Efficient Operation
Larger drilling envelope
Fewer machine movements, higher productivity
✅ Safer Construction
Operator stays in protected cab
Reduced manual drilling at hazardous positions
4. Typical Technical Configuration
| Item | Description |
|---|---|
| Boom Type | Double-curved hydraulic boom |
| Drill | Hydraulic rock drill |
| Propulsion Beam | 4.5–6.5 m (customizable) |
| Hole Diameter | Ø32–76 mm |
| Drilling Depth | Up to 5–6 m per hole |
| Tunnel Section | Approx. 3×3 m to 8×8 m |
| Control | Hydraulic / optional electro-hydraulic |
5. Suitable Rock Conditions
Class II–IV surrounding rock
Hard rock, medium-hard rock
Fractured and uneven rock faces
6. Single-Arm vs Double-Curved Boom
| Feature | Single Straight Boom | Double-Curved Boom |
|---|---|---|
| Coverage | Limited | Very wide |
| Angle Adjustment | Moderate | Excellent |
| Accuracy | Good | Very high |
| Adaptability | General tunnels | Complex tunnels |
7. Typical Construction Benefits
Faster drilling cycle
Better blasting results
Higher anchor bolt installation quality
Lower labor intensity
If you want, we can:
Recommend a specific model for your tunnel size
Compare single-arm vs double-arm double-curved jumbos
Provide parameter selection for Class II surrounding rock
Help match it with shotcrete machines and bolting trolleys
Just tell us your tunnel section size and rock class.
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