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

 Physical Properties

General Features

• The Quick Link Coupled bolt is joined together by a novel system whereby the coupler is substantially the same 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 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 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 and coupled section strength nominally equals the column 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.
• Full encapsulation can be achieved with resin.
• 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."