Quick broaching method and structure

Abstract

The invention relates to a quick broaching method and structure. In the deep hole drilling process, a drilling procedure does not need to be changed, a connector with cutting teeth is adopted to be connected with a drill pipe on the outmost side, and thus drilling in a deep part and broaching in a shallow part are simultaneously achieved. Meanwhile, orientation of a drill hole deep part drill bit is used for ensuring that a small-diameter drill hole in the deep part and a large-diameter drill hole in the shallow part are located on the same axis, and broaching quality is ensured while quick broaching is ensured. The cutting teeth are arranged on the outer edge of the connector with the cutting teeth, rock is cut in the broaching process, inner threads matched with outer threads of drill pipes are arranged at the two ends of the connector so that the connector can be connected with the drill pipes, and a water passing channel is formed internally for passing of water used for drilling in the deep part and broaching in the shallow part. Meanwhile, the connector with the cutting teeth can be provided with an upper set of cutting teeth and a lower set of cutting teeth, the dimension of the lower set of cutting teeth is larger than that of the upper set of cutting teeth, the upper set of cutting teeth and the lower set of cutting teeth are aligned, and thus rock drillings can be conveniently discharged. By means of the quick broaching method and structure, high efficiency and high quality of deep hole shallow part broaching work in a roadway or tunnel project can be ensured, and good popularization prospects are achieved.

Description

technical field [0001] The invention belongs to the technical field of roadway (tunnel) support construction, and in particular relates to a method and structure capable of simultaneously realizing deep drilling and shallow hole expansion. Background technique [0002] In the practice of roadway (tunnel) engineering, the combination of drill bit and extendable drill pipe is generally used in the process of deep hole drilling, and the drill bit is driven by the drill pipe to rotate to realize drilling. The shallow part of the borehole needs a large diameter, and the deep part of the borehole needs a smaller diameter. For example, in the surrounding rock support of a large deformation roadway (tunnel), it is necessary to install some end devices such as constant resistance large deformation anchor cables and non-anchor tail anchor rods. Supporting materials with a larger diameter require a larger hole diameter at the end device, while the remaining positions are still required...

AI Technical Summary

Problems solved by technology

In response to this type of drilling requirements, the following three methods are currently used: first, use large-diameter drill bits alone for drilling. This method does not need to replace the drill bit and is convenient for construction, but it cannot meet the needs of smaller diameters in the deep part of the drill hole. The workload of the hole is heavy; second, the small-diameter drill is used to form the hole first, and then the large-diameter drill is replaced to ream the hole in the shallow part. The drill bit is successful, this method is simple, but it is difficult to apply to deep hole drilling, and the hole diameter is wedge-shaped, gradually expanding from the inside to the outside, which affects the anchoring effect of the support material

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