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-The Friction Bolt-39-2400mm, 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.
-The Friction Bolt-39-2400mm undergoes very stringent tensile testing to ensure product quality.
-Friction Bolt-39-2400mm reference to the AS/NZS1594 / ASTM A1011 standard.
-Thermal diffusion galvanizing is available for the friction bolt.
Friction Bolt-39-2400mm Functions
Friction Bolt-39-2400mm is a frictional ground support system. When a 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-39-2400mm Features&Advantages
Made from high-strength steel band
Immediate frictional Support in axial and radial
Independent support without plate
Easy for installation
Simple design,cost saving
Available in black,cold galvanizing or hot dip galvanized
Friction Bolt-39-2400mm 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-39-2400mm Accessories
Bearing plate,Driver,Pull collar.
Friction Bolt-39-2400mm Length & Package
Length:450-3000mm as specified
Package:100pcs — 300pcs each bundle as specified
Friction Bolt-39-2400mm Applications
Mines
Tunnels
Slopes
Places where need ground support
Friction Bolt-39-2400mm How to work
Assess the characteristics of the ground thoroughly before starting.
Select an appropriate drill bit and create a hole that matches the friction bolt's diameter and length, as well as the specified drilling procedure.
Ensure the hole extends at least 150mm beyond the friction bolt's length for proper engagement.
Attach a plate to the friction bolt, ensuring the dome faces the ring and the tapered end is oriented forward.
Ensure that friction bolts are inserted perpendicular to the surface of the rock for optimal stability.
Insert the driver dolly into the bolt and proceed to drive the friction bolt into the hole until the plate securely contacts the rock surface.
Once the plate is tightly affixed to the rock, avoid hammering the friction bolt further to prevent damage to the end of the bolt.
After installation, conduct pull tests to verify the initial anchorage strength of the friction bolts.
