Friction Bolt

Physical Properties

 

33mm BoltMinimumTypical
Yield Strength415MPa80kN510MPa100kN
Ultima  Ultimate Tensile Strength of Tube510MPa100kN610MPa120kN
Friction Bolt Diameter33mm
Hole Diameter Range30mm min. 32mm max.
Mass Per Metre1.53kg
 Cross Sectional Area
204mm2

 

 

39mm BoltMinimumTypical
Yield Strength415MPa90kN510MPa115kN
Ultima  Ultimate Tensile Strength of Tube510MPa115kN600MPa135kN
Friction Bolt Diameter
39mm
Hole Diameter Range
35mm min. 38mm max..
Mass Per Metre
1.77kg
 Cross Sectional Area
225mm2


47mm BoltMinimumTypical
Yield Strength345MPa120kN445MPa160kN
Ultima  Ultimate Tensile Strength of Tube460MPa165kN510MPa180kN
Friction Bolt Diameter47mm
Hole Diameter Range43mm min. 45.5mm max.
Mass Per Metre2.79kg
 Cross Sectional Area
355mm2

 

 

General Features

  • The DSI Friction Bolt is manufactured from high strength steel tube which has a slot along its entire length. A ring, or collar, is welded on the outer end to hold a domed plate to the rock surface.
  • The 33mm & 39mm Friction Bolt is suitable for installation with hand held rock drills (stopers/drifters). The 47mm Friction Bolt is NOT suitable for installation with hand held rock drills (stopers/drifters).
  • Friction bolts can be load tested by fitting a special ring to the bolt prior to its installation. Pull tests can then be conducted with a hollow ram hydraulic jack.
  • Further corrosion protection can be provided by hot dip galvanizing (refer to Section G).

Installation Guidelines

  • The hole length should be longer than the bolt, nominally 150mm, to allow for any rock fretting during installation.
  • The friction bolt is inserted into the hole. The driving dolly is fitted into the rock drill’s chuck and then the bolt (with accessories) is placed onto the dolly.
  • Using full percussion and thrust, the bolt is fully driven into the hole until the domed plate is firmly against the rock surface. Care should be taken to ensure the rock drill’s feed/thrust is in the same orientation as the hole or the bolt may be bent during installation.

Standard Lengths & Packaging

  • Standard bolt lengths include 450mm long bolts and bolts from 600mm to 2400mm in 300mm increments.
  • Non-standard lengths are available on application.
  • Friction Bolts are supplied in standard packs of 150 bolts (39mm & 47mm) and 300 bolts (33mm).

Notes

  • Only DSI rock bolt components should be used in order to obtain full performance of the bolt system.
  • DSI's Mining Products Division is Quality Assured to ISO 9001:2000, Registration No.QAC/R61/0315.