Friction Bolt-33-1800mm

  • -Thermal diffusion galvanizing is available for the friction bolt
  • -The Friction Bolt-33-1800mm, 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.
  • -Usually combined with domed plates, provides anchoring force for rock strata.
  • -The Friction Bolt-33-1800mm undergoes very stringent tensile testing to ensure product quality.
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Product Details

Friction Bolt-33-1800mm Functions

Friction Bolt-33-1800mm 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.

                              Friction Bolt-33-1800mm

Friction Bolt-33-1800mm Features&Advantages

Made from high strength steel band  

Immediate frictional Support in axial and radial

Easy for installation

Simple design,cost saving

Independent supporting without plate

Available in black,cold galvanizing or hot dip galvanized


Friction Bolt-33-1800mm Mechanical Properties


Technical DataTRFB33TRFB39TRFB42TRFB47
Drill hole diameter (mm)30-32
35-3838-40
43-45.5
Min.Yield strength (kN)8090100120135
Min.Tensile strength (kN)100120132165180
Typ.Tensile strength (kN)120130150180200
Elongation (A%)≥20≥20≥20≥20
Typ.Anchorage (ton/m)4-64-75-8
6-10
Bearing plate (mm)150x150x4150x150x4150x150x4.5150x150x5

Friction Bolt-33-1800mm Accessories

      Bearing plate,Driver,Pull collar.


Friction Bolt-33-1800mm Length & Package

Length:450-3000mm as specified

Package:100pcs — 300pcs each bundle as specified 


Friction Bolt-33-1800mm  Friction Bolt-33-1800mm


Friction Bolt-33-1800mm Applications

Mines

Places where need ground support

Tunnels

Slopes



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 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 the friction bolt into the hole until the plate is firmly against the rock surface.

Do not pound on the friction bolt when plate tightly fixed on the rock surface, to avoid damage of  friction bolt end.

After installation, conduct pull tests to verify the initial anchorage strength of the friction bolts.


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