Friction Bolt Ground Control
- -Friction Bolt Ground Control, 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.
- -Thermal diffusion galvanizing is available for the friction bolt.
- -Usually combined with domed plates, provides anchoring force for rock strata.
- -Friction Bolt Ground Control undergoes very stringent tensile testing to ensure product quality.
Friction Bolt Ground Control Functions
Friction Bolt(Ground Control) is a frictional ground support system.When Friction Bolt(Ground Control) is inserted into drilling hole with smaller diameter, the slot partially closes and bolt diameter is compressed, which creates radical forces on rock roof surface along the whole length and firmly holds the rock.
Friction Bolt Ground Control Features&Advantages
Made from high-strength steel band
Immediate frictional Support in axial and radial
Independent support without plates
Easy for installation
Simple design, cost-saving
Available in black, cold galvanizing, or hot dip galvanized
Friction Bolt Ground Control 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 Ground Control Accessories
Bearing plate, Driver, Pull collar.
Friction Bolt Ground Control Length & Package
Length:450-3000mm as specified
Package:100pcs — 300pcs each bundle as specified
Friction Bolt Ground Control Applications
Mines
Tunnels
Slopes
Places where need ground support
How to work
Evaluate the ground conditions to determine suitability for drilling.
Choose a drill bit that matches the bolt's dimensions and follow the prescribed drilling technique to create a hole slightly longer than the bolt.
Attach a plate to the friction bolt, ensuring the dome faces the ring and the tapered end is oriented forward.
Install the friction bolts at a right angle to the rock face.
Use a driver dolly to insert and drive the friction bolt into the hole until the plate firmly contacts the rock surface.
Once the plate is snugly fitted, refrain from hitting the friction bolt to avoid damaging its end.
Perform pull tests post-installation to ensure the friction bolts are effectively anchored.
