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An expansion grouting anchor

An anchor rod and grouting technology, which is used in the installation of anchor rods, mining equipment, earth-moving drilling, etc., can solve the problems of limited screw length of expansion bolts, easy to be impacted, and small anchoring range, so as to increase the degree of anchoring, The effect of combining solid and improving the degree of anchorage

Inactive Publication Date: 2016-08-17
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, firstly open a hole that fits with the casing 2 at a predetermined position, insert the screw into the hole, and tighten the nut on the anchor rod assembly 1, so that The expansion head 8 moves outward axially, and when the expansion head passes through the expansion tube 21, the expansion tube 21 is stretched out, and the upper corner of the ring teeth 6 arranged on the expansion tube 21 can be further embedded into the hole wall, thereby To achieve the purpose of tight connection between the screw and the hole.

Embodiment 2

[0018] When drilling and anchoring the relatively soft coal seam, first open a hole that fits with the casing 2 at a predetermined position, insert the screw into the hole, and tighten the nut on the anchor assembly 1 to make the expansion The head 8 moves outward axially, and when the expansion head passes through the expansion tube 21, the expansion tube 21 is stretched. Since the hole wall is relatively loose and there are a large number 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 rod in the anchor rod assembly 1, and the quick-setting early-strength grouting is preferably used, and the quick-setting early-strength grouting is injected into the expansion pipe 21 through the grouting pipe 3 on the screw rod, The quick-setting early-strength grout injected into the expansion tube 21 further penetrates into the gaps of the hole wall through the cracks on the expansi...

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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 field of processing and manufacturing coal mine support hardware tools, in particular to an expansion grouting anchor. Background technique [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 it is anchored on the rock layer, because the texture of the common ro...

Claims

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Application Information

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Patent Type & Authority Patents(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