39mm Friction bolt

  • -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.
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Product Details

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

 Friction bolt


39mm Friction bolt Mechanical Properties


Technical DataTRFB33TRFB39TRFB42TRFB47
Drill hole diameter (mm)30-3235-3838-4043-45.5
Min. Yield strength (kN)80
90100120135
Min. Tensile strength (kN)100120132165180
Typ. Tensile strength (kN)120135150
180200
Elongation (A%)≥20≥20≥20≥20
Typ. Anchorage (ton/m)4-64-75-8
6-10
Bearing plate (mm)150x150x4150x150x4
150x150x4.5150x150x5


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


                                              Friction bolt

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.

                                           



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