Friction Bolt-47-2400mm
- -Made from high strength steel band
- -Immediate frictional Support in axial and radial
- -Independent supporting without plate
- -Simple design,cost saving
- -Available in black,cold galvanizing or hot dip galvanized
Friction Bolt-47-2400mm Functions
Friction Bolt-47-2400mm is a frictional ground support system. When friction bolt is inserted into drilling hole with smaller diameter, the slot partially closes and bolt diameter is compressed, which creates radical forces on rock roof surface along the whole length and firmly holds the rock.
Friction Bolt-47-2400mm reference to the AS/NZS1594 / ASTM A1011 standard.
Friction Bolt-47-2400mm have passed tests in many mines and have been supplied steadily for several years.
Usually combined with domed plates, provides anchoring force for rock strata.
Friction Bolt-47-2400mm Mechanical Properties
| Technical Data | TRFB33 | TRFB39 | TRFB42 | TRFB47 | |
| Drill hole diameter (mm) | 32-35 | 35-38 | 38-40 | 43-45.5 | |
| Min.Yield strength (kN) | 80 | 90 | 100 | 120 | 135 |
| Min.Tensile strength (kN) | 100 | 120 | 132 | 165 | 180 |
| Typ.Tensile strength (kN) | 120 | 130 | 150 | 180 | 200 |
| Elongation (A%) | ≥20 | ≥20 | ≥20 | ≥20 | |
| Typ.Anchorage (ton/m) | 4-6 | 4-7 | 5-8 | 6-10 | |
| Bearing plate (mm) | 150X150X4 | 150X150X4 | 150X150X4.5 | 150X150X5 200X200X5 | |
Friction Bolt-47-2400mm Accessories
Bearing plate,Driver,Pull collar.
Friction Bolt-47-2400mm Length & Package
Length:450-3000mm as specified
Package:100pcs — 300pcs each bundle as specified
Friction Bolt-47-2400mm Applications
Mines
Tunnels
Slopes
Places where need ground support
How to work
Assess the ground's characteristics thoroughly before beginning.
Select an appropriate drill bit and create a hole that matches the friction bolt's diameter and length, ensuring the hole extends at least 150mm beyond the bolt's length as per the specified drilling procedure.
Attach a plate to the friction bolt, ensuring the dome faces the ring and the tapered end is positioned forward.
Ensure friction bolts are installed at a right angle to the rock surface for maximum stability.
Insert the driver dolly into the bolt and drive it into the hole until the plate makes firm contact with the rock surface.
Once the plate is securely attached to the rock, avoid hammering the friction bolt further to prevent damage to the end of the bolt.
After installation, conduct pull tests to assess the initial anchorage strength of the friction bolts.
