Fibreglass Dowel Fully Formed

Threaded & Ribbed FRP Dowels

 


Physical Properties:12.5 Tonne Dowel15 Tonne Dowel20 Tonne Dowel30 Tonne Dowel38 Tonne Dowel
Ultimate Tensile Strength125 kN150 kN200 kN300 kN380 kN
Nut/Thread Tensile Strength55 kN85 kN85 kN95 kN95 kN
Single Shear Strength45 kN50 kN57 kN65 kN74 kN
Nut Breakout Torque30 ft/lbs35 ft/lbs40 ft/lbs40 ft/lbs40 ft/lbs
Mass per Meter (Std-HD)650-800 gms675-850 gms720-875 gms750 gms775 gms
Nominal Bolt Diameter20 mm20 mm20 mm20 mm20 mm
Nominal Cross Sectional Area of Bolt310 mm2310 mm2310 mm2310 mm2325 mm2
Thread Length150 mm200 mm25.4 mm25.4 mm25.4 mm
Major Bar Diameter (thread)25.4 mm1.8-2.11.9-2.151.95-2.22.0-2.25
Specific Gravity (grams/cm3)1.7-2.01.8-2.11.9-2.151.95-2.22.0-2.25

Notes - HD - High Density Version
         - 20 and 22 mm bolt diameters available

 

General Features

  • The dowels are pull formed (matched die) fibreglass construction and are ribbed over its full length to provide maximum load transfer.
    Thread form is of a sinusoidal type, nominally 150mm long and 25mm diameter, and is fitted with an integral drive nut with radial face.
  • All fibreglass dowels are designed to be used with chemical anchors and be fully encapsulated.
  • Bolts over 2400mm in length are available in all dowel types by negotiation.
  • Australian Patent Numbers 631881 and 65494 are applicable to these bolts.

Installation Guidelines

  • 26-27mm hole diameters are preferred. Holes over 28mm diameter are not recommended.
  • Hole depth is critical. Hole depth should be shorter than the bolt to allow for the height of the washer and
  • After insertion of the chemical anchors, the bolt is rotated through the anchor(s) 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 regarding installation procedures refer to DSI’s "Practical Guide to Rock Bolting".

Standard Lengths & Packaging

  • Standard bolt lengths range from 1200 to 1800mm in 300mm increments.
  • Other lengths are available by negotiation.
  • 1200mm long dowels are packed in 10’s then palletized in lots of 1000.
  • 1500 and 1800mm long dowels are packed in 10’s then palletized in lots of 500.