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-Friction Bolt-39-900mm, 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
-Friction Bolt-39-900mm undergoes very stringent tensile testing to ensure product quality.
-Provide customers with a pull test for friction bolt after installation.
-The friction bolt have passed tests in many mines and have been supplied steadily for several years
Friction Bolt-39-900mm Functions
Friction Bolt-39-900mm 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-39-900mm 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-39-900mm 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-39-900mm Accessories
Bearing plate,Driver,Pull collar.
Friction Bolt-39-900mm Length & Package
Length:450-3000mm as specified
Package:100pcs — 300pcs each bundle as specified
Friction Bolt-39-900mm Applications
Mines
Tunnels
Slopes
Places where need ground support
How to work
The nature of ground must be evaluated.
Choose the proper bit and drill a hole according to bolt diameter,bolt length,and drilling procedure,and length is at least 150mm longer
than length of friction bolt.
Place a plate onto friction bolt (dome against the ring,tapered end at front).
Install friction bolts perpendicular to the rock surface for optimal effectiveness.
Insert the driver dolly into the bolt and drive it into the hole until the plate presses firmly against the rock.
Avoid hammering the friction bolt once the plate is securely attached to the rock to prevent damage to the bolt's end.
Conduct pull tests to verify the initial anchorage strength of the friction bolts post-installation.
