Expansion grouting anchor rod

A bolt and grouting technology, which is applied in the installation of bolts, mining equipment, earthwork drilling and mining, etc., can solve the problems of limited screw length, vulnerability to impact, and small anchoring range of expansion bolts, so as to increase the degree of anchoring, Combining firmness and improving the effect of anchorage

Inactive Publication Date: 2014-03-26
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Coal enters into deep mining, and the roadway shows significant large deformation characteristics under high ground pressure environment, especially the mining quasi roadway and impact large deformation roadway or soft rock large deformation roadway affected by mining in thick coal seams. Due to the narrow space of the roadway, traditional expansion bolts The length of the screw is limited, and the anchoring range is small. When anchoring at the coal seam, most of the coal seam structure is relatively loose. After anchoring, it is easy to be impacted during long-term use, resulting in a gap between the expansion bolt and the hole wall, resulting in the bolt being easy to It is pulled out as a whole, and when anchored on the rock layer, because the texture of the common rock is relatively hard and the wall of the hole is relatively smooth, the bolts are easy to slide inside, thus making it lose

Method used

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Experimental program
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Effect test

Embodiment 1

[0016] When drilling and anchoring a hard coal seam, first open a hole matching the gap of the sleeve 2 at a predetermined position, insert the screw into the hole, and tighten the nut on the anchor rod assembly 1 to make The expansion head 8 moves axially outwards. When the expansion head passes through the expansion tube 21, the expansion tube 21 is expanded, and the upper corner of the ring 6 provided on the expansion tube 21 can be further embedded in the hole wall, thereby To achieve the purpose of tightly connecting the screw and the hole.

Embodiment 2

[0018] When drilling and anchoring a relatively soft coal seam, first open a hole matching the gap of the sleeve 2 at a predetermined position, insert the screw into the hole, and tighten the nut on the anchor rod assembly 1 to expand The head 8 moves axially outward. When the expansion head passes through the expansion tube 21, the expansion tube 21 is stretched. Because the hole wall is loose and there are a lot of cracks at this time, the ring teeth 6 cannot fit well with the hole wall. At this time, the grouting port of the grouting machine is docked with the screw in the bolt assembly 1, and it is preferable to adopt quick-setting and early-strength grouting. The quick-setting and early-strength grouting is injected into the expansion pipe 21 through the grouting pipe 3 on the screw. The quick-setting and early-strength grouting injected into the expansion pipe 21 further penetrates into the gap of the hole wall through the cracks on the expansion pipe 21 and the grouting h...

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Abstract

The invention discloses an expansion grouting anchor rod which comprises an anchor rod assembly and a sleeve. The sleeve is connected with the anchor rod assembly in a sleeved and matched mode. A grouting tube is axially arranged in a threaded rod of the anchor rod assembly. The sleeve is of a hollow tubular structure integrally. The inlet end of the sleeve is provided with a locating sleeve matched with the anchor rod assembly. The other end of the sleeve is provided with a grouting hole. The outer circumferential surface of the sleeve is provided with a circle of concave expansion tube. The outer surface of the expansion tube is provided with circular teeth. The cross section of each circular tooth is of an isosceles triangle structure, and the top angles of the circular teeth are flush with the locating sleeve. The expansion grouting anchor rod is simple in structure and convenient to use. When the expansion grouting anchor rod is used for carrying out punching and anchoring on hard rocks, the expansion tube can be expanded by an expansion head and simultaneously the top angles of the circular teeth can be further embedded into a hole wall. When the expansion grouting anchor rod is used for carrying out punching and anchoring on soft coal beds, grouting operation can be carried out on the grouting tube through a grouter, so the bonding degree and stability between the soft coal beds near the hole wall can be enhanced.

Description

Technical field [0001] The invention relates to the processing and manufacturing field of coal mine supporting hardware tools, in particular to an expansion grouting type bolt. Background technique [0002] As coal enters deep mining, the roadway presents significant large deformation characteristics under the environment of high ground pressure, especially the thick coal seam affected by mining, and the impact large deformation roadway or soft rock large deformation roadway. Due to the narrow roadway space, traditional expansion bolts The length of the screw is limited and the anchoring range is small. When anchoring in the coal seam, because most of the coal seam is loosely anchored, it is susceptible to impact during long-term use, resulting in a gap between the expansion bolt and the hole wall, which makes the bolt easy It is pulled out as a whole, and when anchored on the rock layer, because the texture of the common rock is relatively hard and the hole wall is relatively sm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D21/00E21D20/02
Inventor 王诗张春华张敏甘宗波杜菲李军文张勋戴凤威
Owner LIAONING TECHNICAL UNIVERSITY
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