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Resin Groutable Expansion Anchor and Method of Installing Same

a technology of expansion anchor and reinforcing, which is applied in the direction of dowels, fastening means, mining structures, etc., can solve the problems of time required to perform this reciprocation, excessive axial insertion force, and increase the installation cos

Inactive Publication Date: 2008-10-23
FCI HLDG DELAWARE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0017]Preferably, the diameter of the expansion shell is substantially equal to the diameter of the rock bolt shank such that the cementing material flows more freely to the region of the rock bolt shank below the expansion shell.

Problems solved by technology

A disadvantage of this type of rock bolt is that during the insertion process, a user often has to axially reciprocate the bolt to sufficiently mix and distribute the resin compound such that the rock bolt forms a strong bond once the resin cures.
As such, the time required to perform this reciprocation can add significantly to the installation cost.
Additionally, the axial insertion force required has been found to be excessive due to the fine clearance between the bore and the expansion assembly providing only a very small path for the resin to flow.
That is, a forward rotation causes the expansion assembly to immediately and irreversibly lock the rock bolt before it reaches its final position, and a reverse rotation will cause the expansion assembly to potentially disengage from the rock bolt shank.

Method used

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  • Resin Groutable Expansion Anchor and Method of Installing Same
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  • Resin Groutable Expansion Anchor and Method of Installing Same

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Embodiment Construction

[0036]Referring to the drawings, the rock bolt includes an elongate shank 1 and an expansion assembly 2 located at the distal end of the shank. The arrangement is such that the expansion assembly expands to lock the rock bolt in a borehole 3 in a rock formation upon relative forward rotation of the rock bolt. As is common to the art, the illustrated rock bolt is used in combination with a two-part epoxy resin compound to secure the rock bolt in the borehole.

[0037]A stop formation in the form of a pressed flat 4 is located at the distal end of the rock bolt shank 1 and is used to lock the expansion assembly with respect to the rock bolt for conjoined rotation upon a relative reverse rotation of the rock bolt, as best shown in FIG. 2. In another embodiment (not shown), the stop formation takes the form of a flange member fixedly connected to the distal end of the rock bolt.

[0038]The expansion assembly 2 includes an expansion shell 5 having three longitudinally extending leaves 6 for l...

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PUM

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Abstract

A rock bolt and a method of installing a rock bolt in a borehole (3) of a rock formation. The rock bolt including an elongate shank (1) and an expansion assembly (2) located at the distal end of the shank. The expansion assembly being expandable to lock the rock bolt in a borehole upon relative forward rotation of the rock bolt. The rock bolt further including stop means (4) to lock the expansion assembly with respect to the rock bolt for conjoined rotation upon a reverse rotation of the rock bolt.

Description

FIELD OF THE INVENTION[0001]The present invention relates to rock bolts and methods for installing rock bolts and in particular to rock bolts which are used in combination with a cementing material. The invention has been developed primarily for rock bolts used in mining applications and will be described hereafter with reference to this application. However, it will be appreciated that the invention is not limited solely to mining applications.BACKGROUND[0002]Any discussion of the prior art throughout the specification should in no way be considered as an admission that such prior art is widely known or forms part of common general knowledge in the field.[0003]There are three main types of rock bolt known for securing supporting structures in mine cavities. The first is a resin anchored rock bolt, which is installed in a borehole by inserting the bolt into the borehole, which contains a quick-setting resin compound. Once the resin is cured the bolt can be tensioned thereby to suppo...

Claims

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Application Information

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IPC IPC(8): E21D21/00
CPCE21D21/0026E21D2021/0066F16B13/143E21D21/0066
Inventor CRAIG, PETER
Owner FCI HLDG DELAWARE