Active extrusion type wing tooth anti-falling pre-stressed anchor rod

Abstract

The active extrusion type wing tooth anti-disengaging pre-stressed anchor rod comprises a sleeve, a tensioning rod body, a tray arranged on the tail portion of the tensioning rod body in a sleeving mode and a nut arranged on the rear side of the tray, the nut is connected to the tensioning rod body in a threaded mode, the sleeve is arranged on the tensioning rod body on the front side of the tray in a sliding and sleeving mode, and multi-ring wing teeth are arranged outside the tensioning rod body at intervals in the length direction of the tensioning rod body. Each ring of wing teeth comprises at least two sets of wing teeth distributed circumferentially, each set of wing teeth comprises two steel plates hinged in a V shape, the two steel plates are arranged in tandem, the other end of the steel plate on the rear side is hinged to the outer wall of the sleeve, the other end of the steel plate on the front side is hinged to the tension rod body, and strip-shaped holes allowing the wing teeth to penetrate through are formed in the positions, corresponding to each set of wing teeth, of the sleeve. When the tensioning rod body is tensioned by prestress, the sleeve moves forwards relative to the tensioning rod body, and the two steel plates can be folded, get close to each other and extrude outwards so as to prevent falling off. The anti-pulling capability of the anchor rod can be improved, and the probability of pulling-off of an anchoring interface is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel surrounding rock support, and in particular to an active extrusion type wing-tooth anti-slip prestressed anchor rod. Background Art

[0002] With the increasing depth and intensity of coal mining, the characteristics of high stress and large deformation in coal tunnels are becoming more and more obvious, and tunnel support has become a problem that restricts the efficient and safe production of coal mines. In actual projects, the surrounding rock of the tunnel is strongly affected by mining, and there are a large number of joints and fissures in the coal rock itself, which makes it often impossible for ordinary anchor rods to meet the prestressing requirements. In addition, the coal seam geology is relatively soft, and the anchoring interface is very easy to pull off under the characteristics of large deformation, and the anchor rod is easy to be unanchored, and the large deformation anchor rod support effect of the tunnel is limited. The failure behavior of ordinary anchor rods is mainly divided into two types: low prestress, unable to provide effective anchoring stress; anchor body detaches from the anchor and shifts, losing the anchoring function. For example, when the anchor rod is set, the anchoring agent may only adhere to the coal body in the crack development area. Coal mining affects the further development of coal wall cracks, and the anchoring force decreases, causing unanchoring. Summary of the invention

[0003] In view of the problems existing in the above-mentioned prior art, the present invention aims to provide an active extrusion type wing-tooth anti-detachment prestressed anchor rod, so as to improve the pull-out resistance of the anchor rod and reduce the probability of pull-out at the anchoring interface.

[0004] In order to achieve the above-mentioned purpose, the present invention aims to provide an active extrusion type wing-tooth anti-slip prestressed anchor rod, comprising a tensioning rod body, a tray sleeved on the tail of the tensioning rod body and a nut arranged on the rear side of the tray, and also comprising a sleeve, wherein the sleeve is slidably sleeved on the tensioning rod body on the front side of the tray, and the tensioning rod body is provided with multiple rings of wing teeth at intervals along its length direction, each ring of wing teeth comprises at least two groups of wing teeth distributed in a circle, and a single group of wing teeth comprises two steel plates hinged in a "V" shape, and the two steel plates are arranged one after the other, wherein the other end of the steel plate on the rear side is hinged on the outer wall of the sleeve, and the other end of the steel plate on the front side is hinged on the tensioning rod body, and strip holes for the wing teeth to pass through are provided on the sleeve corresponding to the position of each group of wing teeth, and when the tensioning rod body is subjected to prestressing, the sleeve moves forward relative to the tensioning rod body, and the two steel plates can be folded, close together and squeezed outward to achieve anti-slip.

[0005] In the above scheme, mounting seats are convexly provided on the outer wall of the sleeve and the outer wall of the tension rod, and the other ends of the two steel plates are respectively hinged to the corresponding mounting seats through a rotating shaft, which has a simple structure and high rod strength. It should be noted that the mounting seat on the tension rod body cannot affect the sleeve installation and movement.

[0006] In the above scheme: a mounting seat is convexly provided on the outer wall of the sleeve, a mounting groove is concavely provided on the outer wall of the tensioning rod body, the other end of the steel plate on the rear side is hinged on the mounting seat through a rotating shaft, and the other end of the steel plate on the front side is hinged in the mounting groove through a rotating shaft. The structure is simple and the installation is convenient. The design of the mounting groove will not interfere with the installation and movement of the sleeve at all.

[0007] In the above scheme: the sleeve and the tray are arranged integrally, which is conducive to ensuring that the movement of the tray will drive the movement of the sleeve, and is conducive to simplifying parts and improving assembly efficiency.

[0008] In the above scheme: each ring of wing teeth includes two groups of wing teeth, and the two groups of wing teeth are arranged opposite to each other. This design facilitates to relatively ensure the pull-out resistance of the anchor rod.

[0009] In the above scheme: each ring of wing teeth includes four groups of wing teeth, and the four groups of wing teeth are evenly distributed around the circumference. This design is convenient for ensuring the pull-out resistance of the anchor rod.

[0010] The beneficial effects of the present invention are:

[0011] During installation, the end of the tensioned anchor rod can be bonded to the rock mass with an adhesive, and then the tray is installed and a pre-tightening force is applied through the nut. While the pre-tightening force is applied, the tray will move closer to the inside of the gangway, and the movement of the tray will drive the sleeve to move forward, causing each set of wing teeth to deform, that is, the two steel plates will fold, get close and squeeze outward; the wing teeth will be embedded in the rock mass after deformation, which can effectively improve the pull-out resistance of the anchor rod and reduce the probability of pull-off at the anchoring interface; at the same time, by embedding the wing teeth into the rock mass, the deformation of the wing teeth will be further increased when the anchor rod moves outward, thereby making the wing teeth more deeply embedded in the rock mass, that is, extrusion will also occur between the wing teeth, and the extrusion between the wing teeth can realize multi-stage and wide-range extrusion of the anchor rod to prevent unanchoring, which can effectively enhance the coupling effect between the rock mass and the anchor rod and reduce the development of cracks inside the rock mass. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0013] Figure 1 It is a schematic diagram of the state before the pre-tightening force is applied in the present invention.

[0014] Figure 2 yes Figure 1 Cross-sectional view at point aa.

[0015] Figure 3 It is a schematic diagram of the state after the pre-tightening force is applied in the present invention.

[0016] Figure 4 yes Figure 3 Cross-sectional view at bb in the middle. DETAILED DESCRIPTION

[0017] like Figure 1 As shown in FIG. 4 , an active extrusion type wing-tooth anti-slip prestressed anchor rod mainly consists of a sleeve 4, a tension rod body 1, a tray 2 sleeved on the tail of the tension rod body 1 and a nut 3 arranged on the rear side of the tray 2, and the nut 3 is screwed on the tension rod body 1.

[0018] The sleeve 4 is slidably mounted on the tension rod body 1 on the front side of the tray 2. Multiple rings of wing teeth A are arranged at intervals along the length direction of the tension rod body 1. Each ring of wing teeth A includes at least two groups of wing teeth A distributed in a circumference. A single group of wing teeth A includes two steel plates 5 hinged in a "V" shape. The two steel plates 5 are arranged one in front and one in the back, wherein the other end of the rear steel plate is hinged on the outer wall of the sleeve 4, and the other end of the front steel plate 5 is hinged on the tension rod body 1. The sleeve 4 is provided with strip holes for the wing teeth A to pass through at the position corresponding to each group of wing teeth A. When the tension rod body 1 is subjected to prestressing, the sleeve 4 moves forward relative to the tension rod body 1, and the two steel plates 5 can be folded close to each other and squeezed outward to prevent them from falling off.

[0019] Preferably, mounting seats are provided on the outer wall of the sleeve 4 and the outer wall of the tension rod body 1, and the other ends of the two steel plates 5 are respectively hinged to the corresponding mounting seats through a rotating shaft, which has a simple structure and high rod strength. It should be noted that the mounting seat on the tension rod body 1 cannot affect the installation and movement of the sleeve 4.

[0020] Preferably, a mounting seat is convexly provided on the outer wall of the sleeve 4, and a mounting groove is concavely provided on the outer wall of the tension rod body 1. The other end of the rear steel plate 5 is hinged on the mounting seat through a rotating shaft, and the other end of the front steel plate 5 is hinged in the mounting groove through a rotating shaft. The structure is simple and the installation is convenient. The design of the mounting groove will not interfere with the installation and movement of the sleeve 4 at all.

[0021] Preferably, the sleeve 4 is integrally provided with the tray, which helps to ensure that the movement of the tray 2 will drive the movement of the sleeve 4, and helps to simplify the parts and improve the assembly efficiency.

[0022] Preferably, each ring of wing teeth A includes two groups of wing teeth A, and the two groups of wing teeth A are arranged opposite to each other. This design facilitates to relatively ensure the pull-out resistance of the anchor rod.

[0023] Preferably, each ring of wing teeth A includes four groups of wing teeth A, and the four groups of wing teeth A are evenly distributed around the circumference. This design facilitates ensuring the pull-out resistance of the anchor rod.

[0024] The use steps of the present invention are:

[0025] Drill holes at the predetermined positions of the coal wall of the surrounding tunnel and wash the holes 2-3 times; insert the tension rod body 1 into the anchor hole, and bond the tension rod body 1 to the coal rock with a strong adhesive; install a tray 2 and a nut 3 at the tail of the tension rod body 1; apply prestress to the tension rod body 1. While applying the preload, the tray 2 will move closer to the inside of the gangway. The movement of the tray 2 will drive the sleeve 4 to move forward, causing each set of wing teeth A to deform, that is, the two steel plates will fold close to each other and squeeze outward. After deformation, the wing teeth A will be embedded in the rock mass to improve the pull-out resistance of the anchor.

Claims

1. An active extrusion type wing-tooth anti-slip prestressed anchor rod, comprising a tension rod body (1), a tray (2) sleeved on the tail of the tension rod body (1), and a nut (3) arranged on the rear side of the tray (2), characterized in that: It also includes a sleeve (4), which is slidably mounted on the tension rod body (1) on the front side of the tray (2). The tension rod body (1) is provided with multiple rings of wing teeth (A) at intervals along its length direction. Each ring of wing teeth (A) includes at least two groups of wing teeth (A) distributed in a circumferential manner. A single group of wing teeth (A) includes two steel plates (5) hinged in a "V" shape. The two steel plates (5) are arranged one in front of the other, wherein the other end of the rear steel plate is hinged on the outer wall of the sleeve (4), and the other end of the front steel plate (5) is hinged on the tension rod body (1). The sleeve (4) is provided with strip holes for the wing teeth (A) to pass through at the position corresponding to each group of wing teeth (A). When the tension rod body (1) is subjected to prestressing, the sleeve (4) moves forward relative to the tension rod body (1), and the two steel plates (5) can be folded, brought close together and squeezed outward to prevent them from falling off.

2. The active extrusion type wing-tooth anti-slip prestressed anchor rod according to claim 1 is characterized in that: Mounting seats are convexly provided on the outer wall of the sleeve (4) and the outer wall of the tension rod body (1), and the other ends of the two steel plates (5) are respectively hinged to the corresponding mounting seats through rotating shafts.

3. The active extrusion type wing-tooth anti-detachment prestressed anchor rod according to claim 1 is characterized in that: A mounting seat is convexly provided on the outer wall of the sleeve (4), and a mounting groove is concavely provided on the outer wall of the tension rod body (1); the other end of the steel plate (5) on the rear side is hinged on the mounting seat via a rotating shaft, and the other end of the steel plate (5) on the front side is hinged in the mounting groove via a rotating shaft.

4. The active extrusion type wing-tooth anti-detachment prestressed anchor rod according to claim 1 is characterized in that: The sleeve (4) is arranged integrally with the tray.

5. The active extrusion type wing-tooth anti-detachment prestressed anchor rod according to claim 1 is characterized in that: Each ring of wing teeth (A) includes two groups of wing teeth (A), and the two groups of wing teeth (A) are arranged opposite to each other.

6. The active extrusion type wing-tooth anti-detachment prestressed anchor rod according to claim 1 is characterized in that: Each ring of wing teeth (A) includes four groups of wing teeth (A), and the four groups of wing teeth (A) are evenly distributed around the circumference.

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