28mm Chemical Anchor Bolt

Physical Properties

 

MinimumTypical
Yield Strength600MPa220kN650MPa340kN
Ultimate Tensile Strength850MPa305kN920MPa400kN
Calculated Shear Strength290kN320kN
Standard Elongation13%16%
Uniform Elongation8%
Mass Per Metre4.3kg
Bar Core Diameter25.8mm
  Major Bar Diameter28.8mm
  Bar straightness to AS 1442-1991
   Cross Sectional Area551mm2
  Rolled Thread M24x3.0mm Pitch

 

 

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 bolt rib pattern design has modified physical characteristics to maximise load transfer from the rock to the bolt, with higher transverse ribs together with lower profile longitudinal ribs.
  • The rolled thread strength nominally equals the column strength of the bar.
  • The 28mm 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). Due to the steel’s homogenous microstructure, it is not affected by hot dipped galvanizing temperatures. Alternative coatings are available by negotiation.

Installation Guidelines

  • 32-33mm 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 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 with threads protected by heavy duty polyethylene bags.
  • Extra high strength bolts are identified by a RED band around the centre of major bundles.
  • Bolt fittings, such as nuts, anti-friction washers and domed balls, are supplied fitted to rock bolts in the configuration requested.

Notes

  • Minimal order quantities may apply to this product.
  • 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.