Rock Bolts
FRP / GRP Bolts
Lightweight, non-corrosive and machine-cuttable ground support.
FRP/GRP bolts are lightweight, high-strength reinforcement systems manufactured from glass-fibre-reinforced polymer. Their corrosion resistance and machine-cuttable properties make them suitable for temporary and permanent ground support.
- Excellent corrosion resistance
- Lightweight and easy to handle
- High tensile strength
- Cuttable by excavation equipment
- Electrically non-conductive
- Non-magnetic
- Fast installation
- Lower transport and handling effort
Technical data
- Range
- SDH-25 / 28 / 32 / 38 / 51
- Material
- Glass-fibre-reinforced polymer
- Corrosion behaviour
- Non-corrosive
- Key property
- Lightweight and machine-cuttable
Applications
- Tunnels and underground construction
- Mining and face stabilization
- Soft-eye TBM openings
- Rock and slope stabilization
- Soil nailing
- Retaining structures
- Marine and corrosive environments
- Temporary excavation support
Technical tables
Self-drilling, corrosion-resistant GFRP hollow bar for ground and rock support.
| GFRP SDA Bar | SDH25 | SDH28 | SDH32 | SDH38 | SDH51 |
|---|---|---|---|---|---|
| Outside Diameter, OD (mm) | 25 | 28 | 32 | 38 | 51 |
| Inside Diameter, ID (mm) | 12 | 14 | 15 | 20 | 33 |
| Cross-Sectional Area (mm²) | 250 | 280 | 360 | 540 | 800 |
| Ultimate Load (kN) | 220 | 280 | 365 | 550 | 650 |
| Thread Breaking Load — Steel Nut | 140 kNL = 70 mm | 150 kNL = 70 mm | 230 kNL = 70 mm | 280 kNL = 100 mm | 320 kNL = 100 mm |
| Thread Breaking Load — GFRP Nut | 70 kN | 70 kN | 80 kN | 90 kN | — |
| Torsional Strength (N·m) | 180 | 250 | 400 | 450 | 700 |
| Ultimate Strain | 2.0% | 2.0% | 2.0% | 2.0% | 2.0% |
| Flexural E-Modulus (GPa) | 45 | 45 | 45 | 45 | 45 |
| Weight (kg/m) | 0.63 | 0.86 | 0.99 | 1.33 | 1.98 |
| Thread Type | R25 | R28 | R32 | R38 | R51 |
| E-Glass Content | 75% | 75% | 75% | 75% | 75% |
| Thread Direction | Left or right | Left or right | Left or right | Left or right | Left or right |
| Available Lengths | 1–12 m (1 m increments) | 1–12 m (1 m increments) | 1–12 m (1 m increments) | 1–12 m (1 m increments) | 1–12 m (1 m increments) |
