CN103670469A - Expansion grouting anchor rod - Google Patents

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

An expansion grouting anchor

technical field

The invention relates to the field of processing and manufacturing coal mine support hardware tools, in particular to an expansion grouting anchor.

Background technique

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 rock is relatively hard and the hole wall is relatively smooth, the bolt is easy to slide inside, thus making it lost.

Contents of the invention

The object of the present invention is to provide an expansion grouting anchor rod, which can effectively solve the problems in the background technology.

In order to solve the problems existing in the background technology, it includes an anchor rod assembly and a casing that fits with it. A grouting pipe is axially opened in the screw rod of the anchor rod assembly, and the casing is a hollow tubular shape as a whole. One end of the entrance is provided with a positioning sleeve that is screwed and matched with the anchor rod assembly, and the other end of the sleeve is provided with a grouting hole, and a circle of expansion tube is concaved inward on the outer surface of the sleeve. , the outer surface of the expansion tube is arranged with ring teeth, the cross section of the ring teeth is an isosceles triangle structure, and the top corner thereof is flush with the positioning sleeve.

A retaining ring concentric with the outer circular surface of the positioning sleeve extends outward.

The other end of the sleeve is provided with an expansion head pipe, the inner diameter of which is slightly larger than the inner diameter of the expansion pipe, and its outer diameter is flush with the sleeve and the positioning sleeve. The expansion head pipe is provided with a gap piston matching with it. An expansion head, the expansion head is fixed on the screw rod of the anchor rod assembly.

Due to the adoption of the above technical scheme, the present invention has the following beneficial effects: simple structure, easy to use, when drilling and anchoring hard rocks, the upper top angle of the ring teeth can be adjusted while the expansion head is stretching the ring expansion tube. It is further embedded into the hole wall, thereby increasing the overall anchoring degree, and the combination with the hole wall is more reliable; when drilling and anchoring the soft coal seam, the grouting pipe can be grouted by the grouting machine after anchoring Grouting operation, and the slurry poured into the casing can further penetrate into the cracks on the hole wall through the cracks on the casing and the grouting holes, which increases the bonding degree and stability between the soft coal seams near the hole walls , further improving the overall anchoring degree.

Description of drawings

In order to illustrate the present invention more clearly, the embodiments will be briefly introduced below in conjunction with the accompanying drawings.

Fig. 1 is a structural representation of the present invention;

FIG. 2 is a partial structural schematic diagram of FIG. 1 .

Detailed ways

In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

Referring to Figures 1-2, this specific embodiment is realized by adopting the following technical scheme, which includes an anchor assembly 1 and a casing 2 that is socketed and matched with it, and the inner screw of the anchor assembly 1 is axially provided with a grouting Pipe 3, the casing 2 is a hollow tubular structure as a whole, one end of the inlet is provided with a positioning sleeve 4 screwed with the anchor rod assembly 1, and the other end of the casing 2 is provided with a grouting hole 5 , a circle of expansion tube 21 is concaved inwardly on the outer circular surface of the sleeve 2, and ring teeth 6 are arranged on the outside of the expansion tube 21, and the cross section of the ring teeth 6 is an isosceles triangle structure, and its upper apex angle It is flush with positioning sleeve 4.

A retaining ring 7 concentric with the positioning sleeve 4 extends outwards from the outer surface of the positioning sleeve 4 .

The other end of the sleeve pipe 2 is provided with an expansion head pipe 22. The inner diameter of the expansion head pipe 22 is slightly larger than the inner diameter of the expansion pipe 21, and its outer diameter is flush with the sleeve pipe 2 and the positioning sleeve 4. The expansion head pipe 22 An expansion head 8 cooperating with the gap piston is arranged inside, and the expansion head 8 is fixed on the screw rod of the anchor rod assembly 1 .

Example 1

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.

Example 2

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 expansion tube 21 and the grouting hole 5 under the pressure of the grouting machine, increasing the connection between the hole wall and the screw. Reliability, and the rapid-setting early-strength grouting that penetrates into the hole wall gap can further increase the stability of the coal seam near the hole, and greatly improve the overall anchorage degree.

In this embodiment, because the hole is drilled and anchored for the soft coal seam, there may be a phenomenon that the collar 6 does not fit firmly with the hole wall, so after the grouting is completed and the grouting port is unscrewed, the pressure in the hole will Therefore, after the grouting operation is completed, the retaining ring 7 should be pressed first, and then slowly unscrew the grouting port. After the grouting port is completely separated from the bolt, due to the The high pressure will push a small amount of quick-setting early-strength slurry out, continue to press the retaining ring for 720-40 seconds, and the remaining pressure can be completely discharged, so as to achieve the purpose of tight connection between the screw and the hole.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (3)

1. An expansion grouting type bolt is characterized in that it comprises a bolt assembly and a casing that is socketed and matched therewith, the screw rod of the bolt assembly is axially provided with a grouting pipe, and the casing is integrally It is a hollow tubular structure, one end of the entrance is provided with a positioning sleeve that is screwed and matched with the anchor rod assembly, and the other end of the sleeve is provided with a grouting hole, and the outer surface of the sleeve is concaved inward. A ring of expansion tube, the outer surface of the expansion tube is arranged with ring teeth, the cross section of the ring teeth is an isosceles triangle structure, and the top corner thereof is flush with the positioning sleeve. 2. An expansion grouting anchor rod according to claim 1, characterized in that a circle of retaining rings concentric with the positioning sleeve extends outward from the outer circular surface of the positioning sleeve. 3. An expansion grouting anchor according to claim 1, characterized in that the other end of the casing is provided with an expansion head pipe, the inner diameter of the expansion head pipe is slightly larger than the inner diameter of the expansion pipe, and its outer diameter is It is flush with the casing and the positioning sleeve, and the expansion head tube is provided with an expansion head matching with the gap piston, and the expansion head is fixed on the screw rod of the anchor rod assembly.

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