20mm Fibreglass Dowel Fully Formed Threaded & Ribbed FRP Dowels

Physical Properties	15 tonne dowel	Typical 20 tonne dowel	30 tonne dowel
Ultimate Tensile Strength	150kN	200kN	300kN
Nut/Thread Tensile Strength	50kN	55kN	55kN
Single Shear Strength	45kN	50kN	60kN
Nut Breakout Torque	38-41Nm
Mass Per Metre	645g
Nominal Bolt Diameter	20mm
Nominal Cross Sectional Area of Bolt	310mm²
Major Bar Dimension	25mm
Specific Gravity in grams/cm³	1.7-1.8	1.8-1.9	2.1-2.2

General Features

The 20mm dowels are pull formed (matched die) fibreglass constructions and are ribbed over their 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 20mm fibreglass dowels are designed to be used with chemical anchors and fully encapsulated.
Only the 20 and 30 tonne capacity fibre glass dowels should be used with cementitious grouts.
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 nut.
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 Arnall'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.

Notes

DSI's Mining Products Division is Quality Assured to ISO 9001:2000, Registration No.QAC/R61/0315.

PRINTED December 2006: All dimensions, weights, quantities and specifications are those applicable at the time of publication and may be amended from time to time.