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-Friction bolt-47-3000mm, made from a strip of high-tensile steel, is roll-formed into a C-shape featuring a longitudinal slot for engagement. Designed with one end tapered to simplify insertion into a drill hole, the opposite end is securely welded to a ring that anchors the bearing plate.
-Thermal diffusion galvanizing is available for the Friction Bolt.
-Usually combined with domed plates, provides anchoring force for rock strata.
-Friction Bolt-47-3000mm undergoes very stringent tensile testing to ensure product quality.
Friction Bolt-47-3000mm Functions
Friction Bolt-47-3000mm is a frictional ground support system. When friction bolt is inserted into a drilling hole with a smaller diameter, the slot partially closes and bolt diameter is compressed, which creates radial forces on the rock roof surface along the whole length and firmly holds the rock.
Friction Bolt-47-3000mm Features&Advantages
Made from high-strength steel band
Immediate frictional Support in axial and radial
Independent support without plates
Easy for installation
Simple design, cost-saving
Available in black, cold galvanizing, or hot dip galvanized
Friction Bolt-47-3000mm 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-47-3000mm Accessories
Bearing plate, Driver, Pull collar.
Friction Bolt-47-3000mm Length & Package
Length:450-3000mm as specified
Package:100pcs — 300pcs each bundle as specified
Friction Bolt-47-3000mm Applications
Mines
Tunnels
Slopes
Places that need ground support
How to work
Firstly, conduct an assessment of the ground conditions.
Select the appropriate bit and bore a hole in accordance with the diameter and length of the bolt, as well as the specified drilling method.
Ensure the hole's length exceeds the friction bolt's length by at least 150mm.
Affix a plate onto the friction bolt, positioning the dome against the ring and the tapered end towards the front.
Install the friction bolts so they are perpendicular to the surface of the rock.
Insert the driver dolly into the bolt and drive the friction bolt into the hole until the plate is securely against the rock surface.
Avoid striking the friction bolt once the plate is snugly attached to the rock surface to prevent damage to the end of the bolt.
After installation, conduct pull tests to verify the initial anchorage effectiveness of the friction bolts.
