Sleeve shell occlusion type anchor rod

Abstract

The utility model discloses a casing occlusion type anchor rod, which belongs to the field of roadway surrounding rock control and comprises a rod body, a casing, a reverse needle, a conical head and threads. The rod body is made of a steel material, and the yield strength of the rod body is 500 MPa or above; the top end of the rod body is a conical head; threads are arranged on the outer surface of the rod body; the sleeve shell is of a cone-shaped structure. The inner surface of the upper end of the sleeve shell is provided with threads; threads on the outer surface of the rod body are matched with threads on the inner surface of the upper end of the sleeve; a reverse needle is arranged on the inner surface of the sleeve shell and extends in the direction parallel to that of the rod body. The sleeve shell is connected with the rod body through threads, and the position of the sleeve shell on the rod body can be adjusted up and down. 2-5 sleeve shells are mounted along the extension length of the rod body, and the distance between every two sleeve shells can be adjusted according to actual surrounding rock conditions. The mechanical occlusal force and friction force between the rod body and the resin anchoring agent are improved through the sleeve shell of the cone-shaped structure, the possibility that an anchoring interface between the rod body and the resin anchoring agent is subjected to debonding failure is reduced, and the supporting resistance of the anchor rod can be remarkably improved.

Description

Technical Field

[0001] The utility model belongs to the field of tunnel surrounding rock control, and in particular relates to a shell-engaging anchor rod. Background Art

[0002] Bolt support is a typical support method in the field of tunnel surrounding rock control. In bolt support, the bolt is connected to the surrounding rock mass as a whole through an anchoring agent or a mechanical anchor head to form an anchor body, thereby strengthening the properties of the rock mass itself and improving the stability of the tunnel surrounding rock.

[0003] A statistical survey of the anchor rods used in existing mines shows that the mainstream anchor rods used in mines are threaded steel anchor rods. Threaded steel anchor rods use their surface thread structure to improve the anchoring force. Compared with round steel anchor rods, the bond strength and support resistance of the anchoring interface of threaded steel anchor rods are significantly greater. However, the results of engineering practice show that threaded steel anchor rods still have failure behaviors such as debonding of the anchoring interface. The reason is that the bite capacity of the threaded structure on the surface of the threaded steel anchor rod is limited. When there is a significant dislocation between the threaded steel anchor rod and the surrounding rock mass, the threaded structure on the surface of the threaded steel anchor rod cannot suppress the debonding failure of the anchoring interface. In view of the above situation, the utility model designs a shell bite type anchor rod, which can effectively solve the problem of easy debonding failure of the anchoring interface of the threaded steel anchor rod. Utility Model Content

[0004] The utility model designs a shell-engaging type anchor rod, aiming to solve the problems existing in the background technology.

[0005] The utility model adopts the following technical scheme and provides a shell-engaging anchor rod, comprising: a rod body, a shell, a counter-pin, a cone head, and a thread; the rod body is made of steel material, and the yield strength of the rod body is above 500MPa; the top of the rod body is a cone head; the outer surface of the rod body is threaded; the shell is a cone-shaped structure; the inner surface of the upper end of the shell is threaded; the thread on the outer surface of the rod body matches the thread on the inner surface of the upper end of the shell; the inner surface of the shell is provided with a counter-pin and the extension direction of the counter-pin is parallel to the extension direction of the rod body.

[0006] As a further description of the above technical solution:

[0007] The sleeve is connected to the rod body through threads and the position of the sleeve on the rod body can be adjusted up and down.

[0008] As a further description of the above technical solution:

[0009] 2 to 5 sleeves are installed along the extended length of the rod body, and the distance between every two sleeves can be adjusted according to actual surrounding rock conditions.

[0010] As a further description of the above technical solution:

[0011] The angle between the cone-shaped structure of the casing and the extending direction of the rod body is α, and the variation range of α is (0,60).

[0012] As a further description of the above technical solution:

[0013] The number of reverse stitches on the inner surface of the shell is not less than 4.

[0014] As a further description of the above technical solution:

[0015] The bottom of the inverted needle installed on the inner surface of the shell is located on the bottom plane of the shell.

[0016] As a further description of the above technical solution:

[0017] The inverted pin is connected to the inner surface of the casing by welding.

[0018] As a further description of the above technical solution:

[0019] The maximum diameter of the circular ring at the bottom of the casing is 1.1 to 1.2 times the diameter of the rod body.

[0020] The utility model provides a shell-engaging anchor rod, which has the following beneficial effects:

[0021] (1) The utility model designs a casing. The casing is a cone-shaped structure as a whole. When the resin anchor flows in the borehole, the resin anchor can flood the casing structure and enter the hollow part of the casing structure. This design connects the resin anchor and the casing as a whole, significantly improving the friction and mechanical bite force between the rod body and the resin anchor, thereby improving the anchor support resistance.

[0022] (2) The utility model designs a reverse pin inside the casing. When the resin anchoring agent submerges the casing and completely solidifies, the reverse pin is completely embedded in the solidified resin anchoring agent, thereby connecting the casing and the resin anchoring agent as a whole, preventing the casing and the resin anchoring agent from sliding, and improving the support resistance.

[0023] (3) The angle α between the sleeve and the rod body of the utility model is adjustable. Therefore, when using the sleeve-engaging anchor rod of the utility model, the user can adjust the angle α between the sleeve and the rod body according to the surrounding rock conditions. This not only helps to flexibly adjust the support resistance of the sleeve-engaging anchor rod, but also helps to make the sleeve-engaging anchor rod adapt to the surrounding rock conditions of various different working conditions.

[0024] (4) The number of shells designed in the utility model can be adjusted between 2 and 5. Changing the number of shells can change the support resistance of the shell bite type anchor. When using the shell bite type anchor, the user can dynamically adjust the number of shells according to the surrounding rock conditions, so as to support surrounding rocks with different conditions.

[0025] (5) The sleeve of the utility model is connected to the rod body by a thread. In actual use, the user can adjust the distance between two adjacent sleeves, thereby adjusting the sleeve bite-type anchor support resistance. Therefore, the user can flexibly adjust the sleeve bite-type anchor support resistance in actual use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings that constitute part of this application are used to provide a further understanding of the utility model and do not constitute an improper limitation of the utility model. In the drawings:

[0027] Figure 1 This is a schematic diagram of the structure of a shell-engaging anchor rod described in the utility model;

[0028] Figure 2 It is a partial cross-sectional view of a shell-engaging anchor rod described in the utility model along direction II;

[0029] In the figure, 1, rod body; 2, sleeve shell; 3, inverted needle; 4, cone head; 5, thread. DETAILED DESCRIPTION

[0030] like Figure 1 to Figure 2 As shown, the utility model provides a shell-engaging anchor rod, comprising a rod body 1, a shell 2, a counter needle 3, a cone head 4, and a thread 5; the rod body 1 is made of steel material, and the yield strength of the rod body is above 500MPa; the top of the rod body 1 is a cone head 4; the outer surface of the rod body 1 is threaded; the shell 2 is a cone-shaped structure; the inner surface of the upper end of the shell 2 is threaded; the thread on the outer surface of the rod body 1 matches the thread on the inner surface of the upper end of the shell 2; the inner surface of the shell 2 is provided with a counter needle 3 and the extension direction of the counter needle 3 is parallel to the extension direction of the rod body 1.

[0031] In a specific embodiment:

[0032] The casing 2 is connected to the rod body 1 through threads and the position of the casing 2 on the rod body 1 can be adjusted up and down.

[0033] In a specific embodiment:

[0034] 2 to 5 casings 2 are installed along the extended length of the rod body 1, and the distance between every two casings 2 can be adjusted according to the actual surrounding rock conditions.

[0035] In a specific embodiment:

[0036] The angle between the cone-shaped structure of the casing 2 and the extension direction of the rod body 1 is α, and the range of α is 0,60.

[0037] In a specific embodiment:

[0038] The number of the reverse needles 3 on the inner surface of the casing 2 is not less than 4.

[0039] In a specific embodiment:

[0040] The bottom of the inverted needle 3 installed on the inner surface of the casing 2 is located on the bottom plane of the casing 2.

[0041] In a specific embodiment:

[0042] The inverted pin 3 is connected to the inner surface of the casing 2 by welding.

[0043] In a specific embodiment:

[0044] The maximum diameter of the circular ring at the bottom of the casing 2 is 1.1 to 1.2 times the diameter of the rod body 1 .

[0045] In specific use, the number of shells 2 to be used and the specific value of the angle α between the cone-shaped structure of the shell 2 and the extension direction of the rod body 1 are determined according to the basic conditions of the tunnel surrounding rock. Figure 1 Screw it onto the rod body 1 in the middle way. Adjust the relative distance between the casing 2. Use the anchor drill to drill a hole in the surrounding rock of the tunnel. Use the drill rod to push the resin anchor roll to the inner end of the borehole. Pull out the drill rod and insert the casing bite-type anchor. Use the cone head 4 to pierce the resin roll. After the resin anchor in the resin roll flows out, it flows out to the outside of the borehole along the gap between the rod body 1 and the borehole wall. During the outflow process, the resin anchor will submerge the casing 2 and fill the gap in the casing 2. The outflowing resin anchor will also submerge the inverted needle 3. After the resin anchor is completely solidified, install the tray and nut on the outside of the casing bite-type anchor and apply a pre-tightening force.

[0046] The present utility model is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in the shape or structure, all those having the same or similar technical solutions as the present application fall within the protection scope of the present utility model.

Claims

1. A shell-engaging anchor rod, characterized in that: The invention comprises a rod body (1), a casing (2), a reverse needle (3), a cone head (4), and a thread (5); the rod body (1) is made of steel material, and the yield strength of the rod body is above 500 MPa; the top of the rod body (1) is a cone head (4); the outer surface of the rod body (1) is threaded; the casing (2) is a cone-shaped structure; the inner surface of the upper end of the casing (2) is threaded; the thread on the outer surface of the rod body (1) matches the thread on the inner surface of the upper end of the casing (2); the inner surface of the casing (2) is provided with a reverse needle (3), and the extension direction of the reverse needle (3) is parallel to the extension direction of the rod body (1).

2. The shell-engaging anchor rod according to claim 1, characterized in that: The casing (2) is connected to the rod body (1) via a thread, and the position of the casing (2) on the rod body (1) can be adjusted up and down.

3. The shell-engaging anchor rod according to claim 1, characterized in that: 2 to 5 casings (2) are installed along the extended length of the rod body (1), and the distance between every two casings (2) can be adjusted according to actual surrounding rock conditions.

4. The shell-engaging anchor rod according to claim 1, characterized in that: The angle between the cone-shaped structure of the casing (2) and the extension direction of the rod body (1) is α, and the variation range of α is (0, 60).

5. The shell-engaging anchor rod according to claim 1, characterized in that: The number of the inverted needles (3) on the inner surface of the casing (2) is not less than 4.

6. The shell-engaging anchor rod according to claim 1, characterized in that: The bottom of the inverted needle (3) installed on the inner surface of the casing (2) is located on the bottom plane of the casing (2).

7. The shell-engaging anchor rod according to claim 1, characterized in that: The inverted needle (3) is connected to the inner surface of the casing (2) by welding.

8. The shell-engaging anchor rod according to claim 1, characterized in that: The maximum diameter of the circular ring at the bottom of the casing (2) is 1.1 to 1.2 times the diameter of the rod body (1).

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