Combined drill bit structure for anchor rod/anchor cable drilling and construction method thereof

A technology of combining drill bits and reaming bits, which is used in drill bits, bolt installation, drilling equipment, etc., can solve the problems of poor hole quality and low drilling efficiency, and achieve good performance, ensure service life, and prolong service life. Effect

Pending Publication Date: 2020-07-10
杭州图强工程材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a combined drill bit structure and construction method for bolt / cable drilling, so as to solve the problems of low drilling efficiency and poor hole quality of existing drill bits

Method used

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  • Combined drill bit structure for anchor rod/anchor cable drilling and construction method thereof
  • Combined drill bit structure for anchor rod/anchor cable drilling and construction method thereof
  • Combined drill bit structure for anchor rod/anchor cable drilling and construction method thereof

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Embodiment Construction

[0028] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0029] like figure 1 As shown, the combined drill bit structure for anchor / cable drilling includes a pilot bit assembly 1 and a reaming bit assembly 2 that is connected under the pilot bit assembly 1, and the radial dimension of the pilot bit assembly 1 is smaller than that of the reaming bit assembly 2 radial dimensions. The top of the pilot drill assembly 1 and the reaming drill assembly 2 are threadedly connected to form a combined drill structure, and the bottom end of the reaming drill assembly 2 is connected to the drill rod of the drill through threads. When drilling, the combined drill bit structure is driven by the drill rod of the drill rig, and the small drill hole is quickly cut through the double-wing ...

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Abstract

The invention discloses a combined drill bit structure for an anchor rod / anchor cable drilling and a construction method thereof. The combined drill bit structure comprises a guide drill bit assemblyand a reamer bit assembly connected below the guide drill bit assembly in a matched mode, wherein the radial size of the guide drill bit assembly is smaller than that of the reamer bit assembly. The combined drill bit structure has the advantages of being reliable in structure, good in use performance, high in drilling efficiency and good in hole forming quality, and the problems of hole shrinkage, hole collapse and poor hole forming quality of high-low stress weak surrounding rocks are effectively avoided.

Description

technical field [0001] The invention relates to the technical field of tunnel drilling support construction, in particular to a combined drill bit structure and construction method for bolt / cable drilling. Background technique [0002] The prerequisite for the successful application of prestressed long bolt / cable support technology in extrusion-type large-deformation tunnels is that the deep anchor holes drilled can be stably formed. Therefore, higher requirements are put forward for the selection of drilling tools. Especially the selection of the drill bit is a key factor restricting the drilling efficiency and hole-forming effect of the long anchor hole. Due to the influence of unfavorable factors such as weak and broken rock formations and high ground stress, the boreholes in extrusion large deformation tunnel engineering are prone to shrinkage and collapse, resulting in low hole formation efficiency of large-diameter boreholes; at the same time, for deep boreholes Drill...

Claims

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Application Information

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IPC IPC(8): E21B10/32E21B10/60E21D20/00
CPCE21B10/32E21B10/60E21D20/003
Inventor 汪波郭新新马振旺吴航通王勇王志才沈艳芳
Owner 杭州图强工程材料有限公司
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