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-Friction Bolt-47-1500mm is roll-formed into a C-shaped bolt with a slot by a high tensile steel band, which one end is tapered for easily inserting the bolt into drilling hole. The other end is welded a ring to hold the bearing plate.
-The Friction Bolt-47-1500mm have passed tests in many mines and have been supplied steadily for several years
-Friction Bolt-47-1500mm undergoes very stringent tensile testing to ensure product quality
-Usually combined with domed plates, provides anchoring force for rock strata.
Friction Bolt-47-1500mm Functions
Friction Bolt-47-1500mm 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 radial forces on rock roof surface along the whole length and firmly holds the rock.
Friction Bolt-47-1500mm Features&Advantages
Made from high strength steel band
Immediate frictional Support in axial and radial
Independent supporting without plate
Easy for installation
Simple design,cost saving
Available in black,cold galvanizing or hot dip galvanized
Friction Bolt-47-1500mm Mechanical Properties
| Technical Data | TRFB33 | TRFB39 | TRFB42 | TRFB47 | |
| Drill hole diameter (mm) | 30-32 | 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 | |
Friction Bolt-47-1500mm Accessories
Bearing plate,Driver,Pull collar.
Friction Bolt-47-1500mm Length & Package
Length:450-3000mm as specified
Package:100pcs — 300pcs each bundle as specified
Friction Bolt-47-1500mm Applications
Mines
Tunnels
Slopes
Places where need ground support
How to work
First, assess the ground's condition thoroughly.
Select an appropriate drill bit and create a hole that accommodates the diameter and length of the bolt, following the specified drilling procedure.
Ensure the hole extends at least 150mm beyond the friction bolt's length.
Attach a plate to the friction bolt, ensuring the dome faces the ring and the tapered end is at the forefront.
Install the friction bolts so they are perpendicular to the rock surface for maximum stability.
Insert a driver dolly into the bolt and drive the friction bolt into the hole until the plate is snug against the rock surface.
Once the plate is securely attached to the rock, avoid hammering the friction bolt to prevent any damage to the bolt's end.
Finally, conduct pull tests after installation to verify the initial anchorage strength of the friction bolts.
