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Method and apparatus for rock bolting

A rock bolt and anchoring technology, which is applied in the installation of bolts, earth cube drilling, mining equipment, etc., can solve problems such as questioning the strength of bolts, incomplete controllability, and inability to use bolts

Inactive Publication Date: 2012-02-01
EPIROC ROCK DRILLS AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In conclusion, the known installation method of cable bolts is a long and not fully controllable process, since the installation has to be carried out in several steps with intermediate waiting stages
[0006] Also in many cases the inability to use bolts until the bond has set is a significant drawback
Based on the above, the strength of the bolts that complete the installation will also be questioned

Method used

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  • Method and apparatus for rock bolting
  • Method and apparatus for rock bolting
  • Method and apparatus for rock bolting

Examples

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Embodiment Construction

[0021] exist figure 1 , the numeral 1 generally designates a device for rock bolting substantially of the type described in US-A-4459067 (Atlas CopcoAB) comprising a pre-tensioned rock bolt and having a tubular expandable rock bolt.

[0022] The tubular bolt generally comprises an expandable portion 5 and a fastening portion 6 in which a connectable tubular tensioner 3 is located, comprising an inner portion 7 having a thread cooperating with the fastening portion 6 and a The internal thread of the tensioning section 8 is matched, and the above-mentioned tensioning section 8 is arranged in turn to be connected to another tensioning section 8 through a connecting piece 9 with bolts.

[0023] Preferably, the components included in the tensioner 3 are standard pieces, which can be combined as required, for example to match the depth of the borehole in which the device 1 is intended to be inserted.

[0024] The abutment 4 comprises an abutment plate 10 and a tensioning nut 11 coo...

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PUM

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Abstract

Method and device for rock bolting, wherein a tubular bolt (2) with closed cross-section is inserted and expanded for anchoring inside a bore hole (12), wherein the tubular bolt is expanded to contact in the inner portion of the bore hole, a tension element (3, 7, 8, 9) which is arranged in the outer portion of the bore hole with an inner part (7) attached to the tubular bolt (2) is pre-stressed and a settable medium is injected into the outer portion of the bore hole (14) between (27) the tension element and the wall of the bore hole and is allowed to set.

Description

technical field [0001] The present invention relates to a method and a device for rock bolting according to the preambles of the first and eleventh aspects of the invention respectively. Background technique [0002] The pre-tensioned wire bolts for rock reinforcement are installed by grouting the wire bolts within the rock borehole to be strengthened. Here cement concrete or any other binder is used as cement. [0003] After the injection of the binder, this must allow setting, whereby the bolt has to be unloaded during the setting phase. After setting, a surface plate is installed against the rock face, on which the bolts are pretensioned by means of a screw mechanism or the like. [0004] Because of the nature of the installation, pre-stretching will only occur along the portion of the wire that is freely stretched from the set binder. The length of the portion that stretches freely from the bond is indeterminate, which is a matter of safety for the anchor. [0005] I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D20/00E21D21/00
CPCE21D21/0046E21D2021/0073E21D21/0073E21D20/00
Inventor F·厄贝里M·坎弗洛德
Owner EPIROC ROCK DRILLS AB