Friction Bolt -42-1800mm
- Friction bolt -42-1800mm 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.
- -Hot rolled steel reference to the GBT3524-2015 standard.
- -Usually combined with domed plates, provides anchoring force for rock strata.
- -Friction Bolt reference to the AS/NZS1594 / ASTM A1011 standard.
Functions
Friction Bolt -42-1800mm is a frictional ground support system. When a 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 -42-1800mm Features&Advantages
Independent supporting without plate
Easy for installation
Simple design,cost saving
Available in black,cold galvanizing or hot dip galvanized
Made from high strength steel band
Immediate frictional Support in axial and radial
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 | |
Bearing plate,Driver,Pull collar.
Length & Package
Length:450-3000mm as specified
Package:100pcs — 300pcs each bundle as specified
Applications
Mines
Tunnels
Slopes
Places where need ground support
How to work
The nature of mine need to be evaluated.
Choose the applicable bit and drill a gap in accordance to bolt diameter,bolt length,and drilling procedure,and size is at least 150mm longer than size of friction bolt.
Place a plate onto friction bolt (dome in opposition to the ring,tapered end at front).
Friction bolts have to be mounted as perpendicular to the rock surface.
Put driver dolly into the bolt and power friction bolt into the gap till the plate is firmly in opposition to the rock surface.
Do not pound on the friction bolt when plate tightly fixes on the rock surface,in order to keep away from harm of friction bolt end.
Pull exams shall be carried out to decide the preliminary anchorage of the friction bolts after installation.
