24mm Chemical High Ribbed Quick Link Coupled Bolt * (Patent Pending)

Physical Properties	24mm Bolt	Coupler
Typical Yield	240kN	-
Typical Ultimate Strength	(340kN)	270kN
Typical Uniform Elongation	8%	1-2%
Mass Per Meter	3.3Kg
Nominal Bar Diameter	21.7mm.	22mm.
Bolt Thread	24mm ISO M24 3 pitch, cold rolled, 140mm length

General Features

The Quick Link Coupled bolt is joined together by a novel system whereby the coupler is substantially the same size diameter as the bolts themselves and therefore requires only a standard hole.
The connection of the bolts is by the single mating of a female and male thread resulting in a much speedier connection time. Load transfer occurs over the full length of the bolt and is not reduced much as per the standard coupler. Tension can be applied to the bolt virtually immediately. Coupled bolts offer the benefits of rigid bolts, where previously cable bolts had to be used.
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 activity assists with mixing the chemical anchors during installation.
The coupled section strength nominally equals the yield strength of the bar.
Negligible difference in diameter of coupler and bolt which allows the coupled bolt to be installed in a 28mm diameter hole.
Optimum results can be achieved with full resin encapsulation.
More than two segments can be joined together, allowing for greater overall bolt length.
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), due to the steel’s homogenous microstructure it is not effected by hot dipped galvanizing temperatures. Alternative coating are available by negotiation.

Installation Guidelines

Bolt designed to be installed in 28mm diameter hole.
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 section with coupler is inserted, then the bolt with the tapered thread is connected into the coupler. Once bolt sections are connected the bolt is rotated through the anchors while being pushed to the back of the hole. If more than two bolt sections are to be connected a special adaptor is available to allow insertion of first two segments through the resin.
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 coupled bolt lengths range from 3000 to 6000mm.
Non-standard requirements are available by negotiation.
Bolts are packaged in bundles with threads protected by heavy duty polyethylene bags.
Bolt fittings, such as couplers, nuts, anti-friction washers and domed balls, are supplied fitted to bolts in the configuration as requested.

Notes

Only DSI rock bolt components should be used to enable the optimum performance of the bolt system to be obtained.
DSI Mining Products Division is Quality Assured to AS 9002, License No. 406. 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.