42mm Friction bolt
- -The 42mm Friction bolt undergoes very stringent tensile testing to ensure product quality.
- -Provide customers with a pull test for 42mm Friction bolt after installation.
- -The 42mm Friction bolt have passed tests in many mines and have been supplied steadily for several years.
- -Thermal diffusion galvanizing is available for the 42mm Friction bolt.
42mm Friction bolt Functions
42mm Friction bolt (Split sets) is a frictional ground support system.When 42mm 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.
Features&Advantages
Available in black,cold galvanizing or hot dip galvanized
Made from high strength steel band
Independent supporting without plate
Easy for installation
Simple design,cost saving
Immediate frictional Support in axial and radial
42mm 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 | |
42mm Friction bolt Accessories
Bearing plate, Pull collar, Driver.
42mm Friction bolt Length & Package
Package:100pcs — 300pcs each bundle as specified
Length:450-3000mm as specified
42mm Friction bolt Applications
Mines
Slopes
Tunnels
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 the friction bolt (dome against the ring,tapered end at front).
Friction bolts must be installed perpendicular to the rock surface.
Put 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 42mm Friction bolt when plate tightly fixes on the rock surface, to avoid damage of friction bolt end.
Pull tests shall be performed to determine initial anchorage of the friction bolts after installation.
