Bottom-expanding drill bit for anchor rod

Abstract

The invention discloses a bottom-expanding drill bit for an anchor rod. The bottom-expanding drill bit comprises a drill bit body. A joint is arranged on the drill bit body, a pressure bar is arrangedin the drill bit body, and an overflowing through hole is formed in the pressure bar, wherein a matched reset spring is further arranged between the pressure bar and the side wall of the drill bit body. A matched hole-expanding body is arranged on the drill bit body through a hole-expanding groove, wherein a hole-expanding body limiting block is arranged at one end of the hole-expanding groove, agear engaged to a rack on the pressure bar is further arranged on the hole-expanding body, a plurality of cutting tools are arranged on the hole-expanding body, and a matched front drill bit is arranged at the tail end of the drill bit body. The bottom-expanding drill bit has the beneficial effects that the bottom-expanding drill bit is simple in structure and convenient to operate, the processing and mounting difficulty and the manufacturing cost of parts are reduced, and the implementation schedule and efficiency of construction are guaranteed.

Description

technical field [0001] The invention relates to the field of engineering construction drilling, in particular to an anchor rod bottom expanding drill bit. Background technique [0002] With the continuous acceleration of infrastructure construction in my country, more and more holes are drilled in various complex geological environments. In traditional anchoring engineering construction, most of the anchor rods are drilled with a single diameter. The pullout resistance is generally achieved by increasing the drilling depth of the bolt. This traditional construction method affects the service life of the bolt, and at the same time, the construction efficiency is low, the effect is poor, and the construction cost is increased. For the problems in the related technologies, no effective solutions have been proposed so far. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is to provide an anchor rod bottom drill bit to overcome the above-mentioned technica...

AI Technical Summary

Problems solved by technology

[0002] With the continuous acceleration of my country's infrastructure construction, more and more holes are drilled in various complex geological environments. In the construction of traditional anchoring projects, most of them are drilled with single-diameter anchor rods. In order to increase anchorage and The pull-out resistance is generally achieved by increasing the drilling depth of the bolt. This traditional construction method affects the service life of the bolt. At the same time, the construction efficiency is low, the effect is poor, and the construction cost is increased.

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