One-piece drill bit for single-pass anchor bolting and single pass drilling apparatus

Abstract

The present invention relates to a drill bit and a single pass drilling apparatus. The one-piece drill bit has a connection portion, adapted to be rigidly connected to a drill steel, a pilot part and a reamer part. The pilot part has first rock machining means. The reamer part has a first center line and second rock machining means. The second rock machining means is provided axially between said connection portion and said first rock machining means and to one side of the pilot part. The drill bit has a rotational direction. A side of the pilot part facing away from the reamer part is provided with a wear resistant means. The wear resistant means is integral with the first rock machining means.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to a drill bit and a single pass drilling apparatus according to the preambles of the independent claims.[0002]The installation of anchor bolts to reinforce excavations is usually carried out in two distinct steps. Usually, a bore is drilled and the drill steel and bit extracted before the bolt is inserted into the bore and tightened or grouted. Single pass anchor bolting involves carrying out these two steps simultaneously, with the task of removing the drill steel to insert the bolt being eliminated. The advantages of single pass bolting include minimizing the time required for bolt installation, improving safety for drilling equipment operators, when comparing with manual or semi manual bolting, and enhancing prospects for full automation of the process. A further advantage is improved quality and precision of anchor bolt installation, when comparing with manual or semi manual bolting. The diameter of the bore is crit...

AI Technical Summary

Benefits of technology

[0006]Still another object of the present invention is to provide a drill bit and a single pass drilling apparatus that are less costly to use and so to make use of single pass bolting in the mining industry more attractive.

[0007]Still another object of the present invention is to provide a drill bit having good wear resistance.

Problems solved by technology

Such apparatus are used via a rotational drilling method or a rotary / percussive drilling method and are generally unsuitable for hard ground conditions.

Existing hard ground percussive anchor bolts that do not reuse the drill bit suffer from cost problems.

Drill bits adapted to be extracted through a casing have been complex and accordingly expensive.

Cost competitiveness of drilling speed versus bit cost are complicated in prior single pass anchor bolts due to the use of specialized anchor bolts and the exclusive use of either complex retractable bits.

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