The active slope protection system (also called Tecco mesh system or SNS active protection) is a surface-retention rockfall mitigation system. Unlike passive systems that catch falling rocks, the active system covers and stabilizes the rock face — preventing rocks from detaching in the first place.
## How Bảo Vệ Chủ Động Works
1. **Mesh Coverage**: High-tensile steel mesh (Tecco G65/3) draped over rock face and anchored at top, bottom, and intermediate points
2. **Anchoring**: Soil nails or rock bolts (25mm diameter, 2-4m depth) transfer loads from mesh to stable ground
3. **Retention**: Mesh holds loose surface rocks against slope — prevents initial detachment
4. **Drainage**: Mesh openings allow water to drain — prevents hydrostatic pressure buildup
5. **Vegetation**: Mesh openings allow vegetation growth — long-term slope stabilization via root systems
## Key Advantages
- **Prevention vs Catching**: Active systems prevent rock detachment. Passive systems catch falling rocks. Active is preferred where slope is above infrastructure.
- **Minimal Excavation**: No major earthwork required. Mesh conforms to existing slope geometry.
- **Permeable**: Rainwater passes through mesh — no hydrostatic pressure. Vegetation can grow through.
- **50kJ Capacity**: System rated to retain rocks up to 50kJ energy — approximately 500kg rock at 10 m/s.
- **Aesthetic**: Mesh is barely visible from distance. Slope retains natural appearance. Vegetation growth enhances aesthetics.
- **Long Life**: High-tensile steel wire with Zn-Al coating. 30-50 year service life.
## Technical Specifications
| Parameter | Value |
|-----------|-------|
| System Type | Active (Tecco) |
| Mesh Type | Tecco G65/3 (high-tensile)
| Wire Diameter | 3.0mm |
| Mesh Opening | 65mm x 65mm (diamond)
| Wire Tensile Strength | >=1770 MPa |
| Wire Coating | Zn-5%Al (Galfan) >=150g/m2|
| Energy Capacity | 50 kJ |
| Anchor Type | Soil nail / rock bolt 25mm dia, 2-4m |
| Anchor Spacing | 2.0m x 2.0m (standard) |
| Plate | 200x200x8mm steel plate |
| Boundary Rope | 12mm galvanized steel rope |
| Standard | GB/T 31444, ETAG 027 |
## System Components
1. **Tecco Mesh**: Main covering mesh, supplied in rolls (3m x 20m standard)
2. **Anchors**: 25mm diameter steel bars, 2-4m length, with mortar grouting
3. **Boundary Rope**: 12mm steel rope around mesh perimeter
4. **Plates**: 200x200mm steel plates distribute anchor load on mesh
5. **Sewing Rope**: 8mm rope connecting mesh panels
6. **Accessories**: Tensioning tools, cutting tools, mortar
## Applications
- **Highway Cut Slopes**: Rock face above đường cao tốcs where rockfall endangers traffic
- **Railway Corridors**: Slopes above rail lines
- **Mining**: Open-pit mine high-wall stabilization
- **Quarry Faces**: Post-blast face stabilization
- **Urban Slopes**: Residential area slope protection
- **Hydroelectric**: Dam abutment and reservoir slope protection
- **Tunnel Portals**: Portal slope stabilization
## Packaging & Delivery
- **Packaging**: Mesh in rolls (3m x 20m). Anchors bundled. Hardware in cartons.
- **Container Loading**: 20ft GP ~ 3000-5000 m2 mesh; 40ft HQ ~ 6000-10000 m2
- **Lead Time**: 10-20 days standard; 20-30 days custom anchor specifications
- **Shipping**: FOB Tianjin / CIF / DDP