Here's a clear overview focused on both applications:
1. Spraying for Slopes (High Slopes / Open Areas)
Main Purposes
Prevent rockfall and weathering
Stabilize soil and fractured rock
Form a protective concrete layer with anchors and mesh
Typical Configuration
High-boom wet shotcrete machine (12–20 m robotic arm)
Truck-mounted or crawler chassis
Diesel engine + air compressor
Remote control spraying
Spraying Features
Large spraying radius, suitable for steep and high slopes
Uniform concrete thickness (usually 8–15 cm)
Strong adhesion on uneven rock surfaces
Can spray upward, downward, and sideward
Advantages
Safe operation (operator stays away from slope face)
High efficiency for large-area spraying
Reduced rebound rate (typically ≤10%)
2. Spraying for Tunnel Walls
Main Purposes
Initial support after blasting
Strengthening surrounding rock
Sealing rock surface and preventing water seepage
Typical Configuration
Tunnel wet shotcrete machine (8–16 m arm)
Rubber-tyred or crawler type
Electric or diesel-electric drive
Compact structure for narrow tunnels
Spraying Features
Precise spraying on sidewalls and arch crown
Stable output (typically 20–30 m³/h)
Good concrete compaction and density
Compatible with steel mesh and rock bolts
Advantages
High construction quality
Low dust and rebound (safer tunnel environment)
Continuous spraying, fewer interruptions
3. Key Technical Parameters (Reference)
| Item | Slope Spraying | Tunnel Spraying |
|---|---|---|
| Arm length | 12–20 m | 8–16 m |
| Output | 20–30 m³/h | 15–30 m³/h |
| Rebound rate | ≤10% | ≤10% |
| Max aggregate size | 16–20 mm | 16–20 mm |
| Concrete type | Wet-mix | Wet-mix |
4. Why Choose Wet Shotcrete (vs Dry Shotcrete)
Better concrete quality and strength
Lower dust and rebound
More suitable for long tunnels and high slopes
Meets modern tunnel construction standards (hydropower, railway, highway)
If you want, we can recommend a specific wet shotcrete machine model based on:
Tunnel size (width × height)
Slope height and angle
Required spraying capacity
Power preference (diesel / electric)
Just tell us your project conditions.
