24mm Chemical Anchor Bolt with Forged Integral Head

 Physical Properties

 

Mass Per Metre2.92kg
Bar Core Diameter21.7mm
Cross Sectional Area of Bar370mm2
Major Bar Diameter23.2mm
Bar straightness to AS 1442-1991
Rolled Thread M24x3.0mm Pitch

 

 

Standard Strength BoltMinimum Typical
  Yield Strength250MPa95kN300MPa110kN
Ultimate Tensile Strength410MPa150kN475MPa175kN
Calculated Shear Strength100kN115kN
Standard Elongation22%35%
Uniform Elongation
12%

 

 

HighStrength BoltMinimumTypical
  Yield Strength375MPa140kN400MPa150kN
Ultimate Tensile Strength570MPa210kN680MPa250kN
Calculated Shear Strength140kN170kN
Standard Elongation17%22%
Uniform Elongation
10%




  Extra High Strength BoltMinimumTypical
  Yield Strength600MPa220kN650MPa240kN
Ultimate Tensile Strength850MPa310kN920MPa340kN
Calculated Shear Strength205kN225kN
Standard Elongation13%15%
Uniform Elongation
8%

 

 

General Features

  • Manufactured from a special hot rolled deformed bar designed by DSI and commonly known as "Left Hand Anchor Bar", this bolt features a rib pattern which actively assists with mixing the chemical anchors during installation.
  • The deformed bar rib pattern improves load transfer properties.
  • The 24mm chemical anchor bolts have a hot forged integral head, 30mm square, and are used in areas where headroom is low or when bolt tails are undesirable. For this reason, flat plates are generally used with headed bolts and are un-tensionable.
  • The 24mm chemical anchor bolt is designed to be used with chemical anchors (refer to Section F), but can be effectively used with cementitious grouts.
  • In some circumstances, these bolts may be used with an expansion shell by the addition of a M24x3.0mm thread on the up hole end of the bolt.
  • Corrosion protection may be provided by hot dip galvanizing (refer to Section G). Alternative coatings are available by negotiation.
  • Australian Patent Number 536627 is applicable to the bar design of this bolt.

Installation Guidelines

  • 27-28mm hole diameters are preferred. If larger diameter holes are to be used, refer to "Posimix" bolts on page A1.10.
  • Hole depth is critical. Hole depth should be slightly longer than the bolt length to ensure that the bolt plate and bolt head are tight to the roof after installation.
  • After insertion of the chemical anchors, the bolt is rotated through the anchors while being pushed to the back of the hole.
  • It is important to follow the chemical manufacturer’s recommended mixing and hold times as printed on the chemical anchor cartons. DO NOT OVER-MIX.
  • For further details of installation procedures, refer to DSI's "Practical Guide to Rock Bolting."

Standard Lengths & Packaging

  • Standard bolt lengths range from 600 to 3000mm in 300mm increments.
  • Non-standard requirements are available by negotiation.
  • Bolts are packaged in bundles.

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.