Expandable rock bolt and rock bolting system

Abstract

The present invention is related to a rock bolt ( 7 ), expandable by means of a pressure media, for insertion into a borehole. The expandable bolt ( 7 ) comprises a connection unit ( 8 ) with means ( 11 ) for detachable interaction with an expansion means ( 10 ) for expansion of the rock bolt ( 7 ), as well as with a suspension element ( 16 ). The connection unit is designed with such external dimensions so that it may be inserted into the bore-hole. The invention also relates to such a rock bolting system.

Description

technical field [0001] The present invention relates to expandable rock bolts for suspension installations. Background technique [0002] In tunnels and in mines, it is often necessary to suspend different devices used in the work, such as fans, drilling equipment, etc. Additionally, in mines and in tunnels, platforms are often used for conveying excavated and other materials. These platforms are suspended from the roof of the tunnel or mine shaft, eg the above can be done by installing beams in the roof and then fixing the platforms to the beams. [0003] To secure these devices, such as the service platform, to the top, various bolts are used. One often uses expandable bolts, so-called expansion bolts, where the bolt comprises a tube whose interior is pressurized by a pressure member, such as a high-pressure fluid, and thereby expanded. An example of such an expandable bolt is shown in Swedish patent no. 7902129-1. Expansion bolts can be used with specific bindings sec...

AI Technical Summary

Problems solved by technology

[0004] The disadvantage of using these studs as a suspension is that they, together with the specific suspension joint, basically protrude from the roof of the tunnel, and must therefore be cut and / or covered with a thick layer of stucco cement

This is a costly and time-consuming operation and it is desirable to minimize it

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