FIELD: mining.
SUBSTANCE: self-tapping anchor bolt comprises rod and anchor device. The first end of bolt has drilling tip intended for penetration into rock, and the second end of bolt is adapted to be connected to drilling device, providing for bolt rotation and axial pressure at bolt. Circulating channel is provided to supply fluid to drilling tip, and in one of versions a central passage is arranged in rod to form part of this circulating channel. Anchor device is intended to retain the bolt in drilled hole and comprises a holder, having one or several inclined external surfaces installed on rod or arranged as a whole with it, and at least one spacer element located over the holder. Spacer element radially shifts outside by a certain relative displacement between holder and at least one spacer element.
EFFECT: considerable reduction of time required to install anchor bolts.
33 cl, 20 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| ANCHOR BOLT WITH MECHANICAL ANCHOR | 2008 |
|
RU2470158C2 |
| ANCHOR BOLT | 2004 |
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|
RU2454543C2 |
| SCREW-IN ANCHOR WITH CONTROLLED PLASTIC DEFORMATION (VERSIONS) AND CONTROL METHOD OF FULL PLASTIC DEFORMATION OF CEMENTED SCREW-IN ANCHOR | 2005 |
|
RU2364723C2 |
| SPACER ANCHOR | 2013 |
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|
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| HOLLOW ANCHOR BOLT, SELF-DRILLING ANCHOR BOLT AND METHOD TO SHAPE HOLLOW ANCHOR BOLT | 2008 |
|
RU2458226C2 |
| METHOD OF INSTALLATION OF ANCHORS FOR ROCKS | 2005 |
|
RU2376474C2 |
