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-39mm Friction Bolt 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 39mm Friction bolt undergoes very stringent tensile testing to ensure product quality.
-Thermal diffusion galvanizing is available for the 39mm friction bolt.
39mm Friction bolt Functions
39mm Friction bolt (Split sets) 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 the bolt diameter is compressed, creating radial forces on the rock roof surface along the whole length and firmly holding the rock.
39mm Friction bolt Features&Advantages
Independent supporting without plate
Easy for installation
Made from high strength steel band
Immediate frictional Support in axial and radial
Simple design,cost saving
Available in black,cold galvanizing or hot dip galvanized
39mm Friction bolt 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 | 135 | 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 | |
39mm Friction bolt Accessories
Bearing plate,Driver,Pull collar.
39mm Friction bolt Length & Package
Length:450-3000mm as specified
Package:100pcs — 300pcs each bundle as specified
39mm Friction bolt Applications
Slopes
Places where need ground support
Mines
Tunnels
How to work
The nature of the ground must be evaluated.
Choose the proper bit and drill a hole according to bolt diameter,bolt length,and drilling procedure; the length is at least 150mm longer than the length of friction bolt.
Place a plate onto friction bolt (dome against the ring,tapered end at front).
Friction bolts must be installed as perpendicular to the rock surface.
Put the driver dolly into bolt and drive friction bolt into the hole until the plate is firmly against the rock surface.
Do not pound on the friction bolt when plate is tightly fixes on the rock surface,in order to avoid damage of friction bolt end.
Pull tests shall be performed to determine initial anchorage of the friction bolts after installation.
