Expansion Shell Bolt (Round Bar) or Double Ended Bolt

Expansion Shell Bolt (Round Bar) or Double Ended Bolt

Physical Properties

 

16mm BoltMinimumTypical
Yield Strength400MPa65kN460MPa75kN
Ultimate Tensile Strength590MPa95kN645MPa105kN
Calculated Shear Strength60kN70kN
Standard Elongation17%22%
Uniform Elongation12%
Mass Per Metre1.21kg
Bar Diameter14.4mm
Cross Sectional Area of Bar160mm2
Bar Straightness to AS 1332-1992
Rolled Thread M16x2.0 Pitch
20mm Bolt MinimumTypical
Yield Strength375MPa95kN440MPa110kN
Ultimate Tensile Strength540MPa135kN680MPa170kN
Calculated Shear Strength90kN110kN
Standard Elongation19%22%
Uniform Elongation12%
Mass Per Metre1.99kg
Bar Diameter18.0mm
Cross Sectional Area of Bar250mm2
Bar Straightness to AS 1332-1992
Rolled Thread M20x2.5 Pitch

General Features

  • Double ended bolts are generally used with expansion shells and post grouted with cementitious grouts.
  • The double ended bolt utilises, and is compatible with, DSI Arnall’s expansion shells which provide:
    • An up the hole point anchor.
    • Centralisation of the bolt on the up hole end.
    • Pre-Tensioning of the bolt.
  • Refer to Section B4.9 for details of the expansion shell range.
  • A drive nut is fitted to allow initial setting of the expansion shell.
  • The thread’s strength is nominally equal to the column strength of the bar.
  • Corrosion protection may be provided by hot dip galvanizing (refer to Section G).
  • Alternative coatings are available by negotiation.
  • Double ended bolts are often used as tie rods with rib supports (arches) and supplied with two plain nuts.

Installation Guidelines

  • It is imperative that the hole diameter suits the expansion shell to be used.
  • The drilled hole length must be longer than the bolt by approximately 50mm.
  • Appropriate components are fitted to the bolt. The expansion shell is screwed onto the bolt until the bolt thread just protrudes through the expansion shell plug.
  • After placing the bolt in the hole to its full length, the bolt nut is rotated to set the shell and tension the bolt.

Standard Lengths & Packaging

  • Standard bolt lengths range from 600 to 2400mm in increments of 300mm.
  • Non-standard requirements are available by negotiation.
  • Bolts are packaged in bundles with threads protected by heavy duty polyethylene bags.
  • Bolt fittings, such as nuts, anti-friction washers and dome balls, are supplied fitted to rock bolts in the configuration requested.

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.