24mm Chemical Anchor Bolt - Rock and Roof Bolts

24mm Chemical Anchor Bolt 

 

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 BoltMinimumTypical
  Yield Strength250MPa95kN300MPa110kN
Ultimate Tensile Strength410MPa150kN475MPa175kN
Calculated Shear Strength100kN115kN
Standard Elongation22%35%
Uniform Elongation12%
High Strength BoltMinimumTypical
  Yield Strength375MPa140kN400MPa150kN
Ultimate Tensile Strength570MPa210kN680MPa250kN
Calculated Shear Strength140kN170kN
Standard Elongation17%22%
Uniform Elongation10%
Extra High Strength BoltMinimumTypical
  Yield Strength600MPa220kN650MPa240kN
Ultimate Tensile Strength840MPa305kN920MPa340kN
Calculated Shear Strength200kN225kN
Standard Elongation13%15%
Uniform Elongation8%

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 rolled thread strength nominally equals the column strength of the bar.
  • 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.
  • 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 shorter than the bolt to allow for the height of the washer and nut.
  • 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 technique 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 with threads protected by heavy duty polyethylene bags.
  • Bolt fittings, such as nuts, anti-friction washers and domed 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.