Reaming bit

Abstract

The invention relates to a reaming bit which comprises a bit (1), a core barrel (2) and a drill rod (3), wherein a cutting alloy (4) is arranged on the bit (1), and a water injection pipe (5) is arranged in the drill rod (3). The reaming bit is characterized in that a tapered outflow hole (6) is formed in the drill bit (1), a water orifice (7) is formed at the end part of the tapered outflow hole (6), spraying holes (8) are formed in the side wall of the tapered outflow hole (6), and the bit (1) is connected with the core barrel (2) through threads (9); and the water injection pipe (5) is communicated with the tapered outflow hole (6), a plugging ball is arranged at the water orifice (7) in a matching manner, and the diameter of the plugging ball (10) is smaller than that of the water injection pipe (5) and larger than that of the water orifice (7). According to the reaming bit, during construction of an anchor rod or pile with an expanding head, a drilling tool is not required to be changed, and a cavity can be formed once; and the structure is simple and reliable, and the stability is good.

Description

technical field [0001] The invention belongs to the technical field of engineering construction machinery and equipment, in particular to a reaming drill bit used in engineering machinery such as soil layer anchor expansion heads and hole bottom reaming piles. Background technique [0002] In the process of civil engineering construction, it is often necessary to carry out slope support construction. Some slopes belong to the soil layer structure. In order to maintain the stability of the soil layer slope, the commonly used support scheme is to set anchor rods in the slope soil layer, and rely on the friction between the anchor rods and the soil layer to maintain the stability of the soil slope. In order to increase the stability of the soil slope, an expansion head is installed at the end of the anchor rod in the soil layer to increase the diameter of the anchor rod to increase the contact area between the anchor rod and the soil, thereby increasing the friction force. At t...

AI Technical Summary

Problems solved by technology

Some of the current construction machines have complex structures, and some need to replace drill pipes and drilling tools. In the strata that are prone to collapse, the construction efficiency is reduced, and some waste holes have to be changed, which increases the construction cost and is easy to cause landslides, etc. dangerous occurrence

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