Combined self-propelled grouting anchor rod based on argillaceous soft rock

Abstract

The combined self-propelled grouting anchor rod based on the argillaceous soft rock comprises an inner pipe, the inner pipe is sleeved with an outer pipe attached to the outer wall of the inner pipe, the inner pipe penetrates through the two ends of the outer pipe, a drill bit is fixed to one end of the inner pipe, and the maximum outer diameter of the drill bit is larger than the outer diameter of the outer pipe; the inner wall of the outer pipe is provided with a section of inner cavity which has a certain gap with the inner pipe, the inner pipe is provided with a plurality of grout outlet holes communicated with the inner part of the inner pipe corresponding to the position of the inner cavity, and the outer wall of one end of the inner cavity of the outer pipe, which is far away from the drill bit, is provided with a grout outlet groove. Compared with the prior art, the axial limiting force between a cement column formed by grouting of the anchor rod and a muddy soft rock wall is large, supporting is stable, and the anchoring effect is good.

Description

Technical Field

[0001] This invention relates to the technical field of coal mine support equipment, specifically a combined self-propelled grouting anchor bolt based on argillaceous soft rock. Background Technology

[0002] Due to the loose and highly fluid nature of argillaceous soft rock, anchoring support is necessary in coal mines to prevent collapses caused by its flow. Current technology uses grouting anchors, which inject cement grout into the matrix to anchor the anchor and cement column together. However, due to the loose and highly fluid nature of argillaceous soft rock, existing grouting anchors provide insufficient axial restraint force to the argillaceous soft rock matrix.

[0003] Therefore, it is necessary to provide a combined self-propelled grouting anchor bolt based on argillaceous soft rock to solve the problems mentioned in the background art. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: a combined self-propelled grouting anchor bolt based on argillaceous soft rock, comprising an inner tube, an outer tube fitted to the outer wall of the inner tube, the inner tube penetrating both ends of the outer tube, a drill bit fixed at one end of the inner tube, the maximum outer diameter of the drill bit being larger than the outer diameter of the outer tube, an inner cavity with a certain gap between the outer tube and the inner tube being formed on the inner wall, a plurality of grout outlet holes communicating with the interior of the inner tube being formed at the location corresponding to the inner cavity, and a grout outlet groove being formed on the outer wall of the outer tube at the end of the inner cavity away from the drill bit.

[0005] Furthermore, preferably, the inner tube is provided with multiple intersecting positive and negative threads at the position between the drill bit and the inner cavity, and the two ends of the positive and negative threads are smoothly connected together. The inner wall of the outer tube corresponding to the positive and negative thread positions is provided with a slider, which can slide in the positive or negative thread.

[0006] Furthermore, as a preferred embodiment, the slider is oval-shaped, with its center rotatably connected to the inner wall of the outer tube.

[0007] Furthermore, as a preferred embodiment, the outer wall of the outer tube is provided with a keyway extending along its axial direction, and a sealing device is fitted on the outside of the outer tube, wherein the keyway and the sealing device are slidably connected and rotationally restricted.

[0008] Furthermore, as a preferred embodiment, a valve cover capable of sealing the inside of the inner tube is provided at the slurry outlet hole away from the drill bit. A rotating shaft is fixed in the valve cover, and both ends of the rotating shaft rotatably extend through the outer wall of the inner tube.

[0009] Furthermore, as a preferred embodiment, the axis of the rotating shaft is offset from the center of the valve cover, so that the valve cover is divided into an upper cover and a lower cover by the rotating shaft.

[0010] Furthermore, as a preferred embodiment, multiple continuous ratchet rings are formed in the inner wall of the inner cavity, with the ratchet rings facing away from the drill bit. Guide plates are fixed on one side of the lower cover portion of the valve cover at both ends of the rotating shaft, and the guide plates can fit into the ratchet rings.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] In this invention, the inner tube is drilled into the wall and rotated and fed. When the slider is in the positive thread, the valve cover blocks the cement slurry. When the slider slides into the negative thread, the cement slurry passes through the valve cover and is then injected from the slurry outlet. The cement slurry spreads to the surroundings and combines with the argillaceous soft rock to form a cement body. The outer tube moves back and forth in the inner tube in sequence, so that multiple cement bodies are connected end to end to form a gourd-shaped cement column. The axial restraint force between the cement column formed by grouting with this anchor rod and the argillaceous soft rock wall is large, the support is stable, and the anchoring effect is good. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a combined self-propelled grouting anchor bolt based on argillaceous soft rock.

[0014] Figure 2 This is a schematic diagram of the structure of a positive thread and a negative thread;

[0015] Figure 3 This is a schematic diagram of the valve cover structure;

[0016] In the diagram: 1. Inner tube; 2. Outer tube; 3. Drill bit; 4. Inner cavity; 5. Slurry outlet hole; 6. Slurry outlet groove; 7. Keyway; 8. Sealer; 9. Ratchet ring; 10. Slider; 11. Positive thread; 12. Negative thread; 13. Valve cover; 14. Shaft; 15. Guide plate. Detailed Implementation

[0017] Please see Figure 1 In this embodiment of the invention, a combined self-propelled grouting anchor bolt based on argillaceous soft rock includes an inner tube 1, an outer tube 2 fitted to the outer wall of the inner tube 1, the inner tube 1 passing through both ends of the outer tube 2, a drill bit 3 fixed at one end of the inner tube 1, the maximum outer diameter of the drill bit 3 being larger than the outer diameter of the outer tube 2, an inner cavity 4 with a certain gap between the inner tube 1 and the inner wall of the outer tube 2, a plurality of grout outlet holes 5 communicating with the interior of the inner tube 1 at the location of the inner cavity 4, and a grout outlet groove 6 on the outer wall of the outer tube 2 at the end of the inner cavity 4 away from the drill bit 3.

[0018] Please see Figure 2In this embodiment, the inner tube 1 is provided with multiple intersecting positive threads 11 and negative threads 12 at the position between the drill bit 3 and the inner cavity 4, and the two ends of the positive threads 11 and negative threads 12 are smoothly connected together. The outer tube 2 is provided with a slider 10 in the inner wall corresponding to the position of the positive threads 11 and negative threads 12, and the slider 10 can slide in the positive threads 11 or negative threads 12.

[0019] In this embodiment, the slider 10 is oval-shaped, and its center is rotatably connected to the inner wall of the outer tube 2. When the inner tube 1 rotates relative to the outer tube 2 and the slider 10 is located in the positive thread 11, the outer tube 2 slides relative to the inner tube 1 in a direction away from the drill bit 3 (rearward). Since the slider 10 is oval-shaped and tilted towards the positive thread 11, the slider 10 can move along the positive thread 11 without jumping into the reverse thread 12. When the slider 10 slides to the end of the positive thread 11, it smoothly transitions to the reverse thread 12, and the slider 10 tilts towards the reverse thread 12, causing the outer tube 2 to slide forward relative to the inner tube 1. That is, when the inner tube 1 continues to rotate relative to the outer tube 2, the outer tube 2 slides back and forth relative to the inner tube 1, so that the cement slurry is intermittently injected from the slurry outlet 6.

[0020] In this embodiment, the outer wall of the outer tube 2 is provided with a keyway 7 extending along its axial direction, and a sealing device 8 is sleeved on the outside of the outer tube 2. The keyway 7 and the sealing device 8 are slidably connected and rotationally restricted. That is, when the sealing device 8 is fixed outside the wall, the outer tube 2 can only move axially and is restricted from rotation by the restriction of the keyway 7.

[0021] Please see Figure 3 In this embodiment, a valve cover 13 is provided in the direction away from the drill bit 3 in the slurry outlet 5 of the inner tube 1, which can seal the inside of the inner tube 1. A rotating shaft 14 is fixed in the valve cover 13, and the two ends of the rotating shaft 14 can rotatably pass through the outer wall of the inner tube 1.

[0022] In this embodiment, the axis of the rotating shaft 14 is offset from the center of the valve cover 13, so that the valve cover 13 is divided into an upper cover and a lower cover by the rotating shaft 14. That is to say, when there is cement slurry under a certain pressure in the inner tube 1, the pressure of the cement slurry on the upper cover and the lower cover of the valve cover 13 is not equal, so a torque is generated on the rotating shaft 14 in the direction A, thereby causing the valve cover 13 to rotate in the horizontal direction so that the cement slurry can pass through the valve cover 13.

[0023] In this embodiment, multiple continuous ratchet rings 9 are formed in the inner wall of the inner cavity 4, with the ratchet rings 9 facing away from the drill bit 3. Guide plates 15 are fixed to the side of the rotating shaft 14 near the lower cover portion of the valve cover 13 at both ends, and the guide plates 15 can fit against the ratchet rings 9. That is, when the outer tube 2 slides towards the drill bit 3, the rotating shaft 14 can rotate in direction A because the guide plates 15 move in the direction of the ratchet rings 9, allowing the cement slurry to pass through. When the outer tube 2 slides away from the drill bit 3, the rotation of the rotating shaft 14 in direction A is locked because the guide plates 15 move against the direction of the ratchet rings 9. When the rotating shaft 14 rotates slightly in the opposite direction of A, allowing the guide plates 15 to jump over the ratchet rings 9, the valve cover 13 automatically returns to the vertical direction under the pressure of the cement slurry, thereby blocking the cement slurry.

[0024] In practice, a positioning hole is pre-drilled in the muddy soft rock wall that needs anchoring. The sealing device 8 is fitted over the outer pipe 2 and slid to the end closest to the drill bit 3. The drill bit 3 is inserted into the positioning hole, and the sealing device 8 is fixed to the wall. The inner pipe 1 is connected to the grouting drill and drilled into the wall for grouting. When the inner pipe 1 rotates and feeds, the following occurs:

[0025] When the slider 10 is in the positive thread 11, the inner tube 1 moves forward while the outer tube 2 remains stationary, and because the guide plate 15 moves against the direction of the ratchet ring 9, the valve cover 13 blocks the cement slurry.

[0026] When the slider 10 slides into the reverse thread 12, the inner tube 1 continues to move forward while the outer tube 2 moves forward at twice the speed. As the guide plate 15 moves along the direction of the ratchet ring 9, the cement slurry can pass through the valve cover 13 and then be injected from the slurry outlet 6. The cement slurry spreads in all directions and combines with the muddy soft rock to form a cement body.

[0027] The outer pipe 2 moves back and forth in the inner pipe 1 in sequence, so that multiple cement bodies are connected end to end to form a gourd-shaped cement column.

[0028] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A combined self-propelled grouting anchor bolt based on argillaceous soft rock, comprising an inner tube (1), characterized in that, The inner tube (1) is fitted with an outer tube (2) that fits against its outer wall. The inner tube (1) passes through both ends of the outer tube (2). A drill bit (3) is fixed at one end of the inner tube (1). The maximum outer diameter of the drill bit (3) is greater than the outer diameter of the outer tube (2). The inner wall of the outer tube (2) has an inner cavity (4) with a certain gap from the inner tube (1). The inner tube (1) has multiple slurry outlet holes (5) that communicate with the inside of the inner tube (1) at the location of the inner cavity (4). The outer tube (2) has a slurry outlet groove (6) on the outer wall of the inner cavity (4) away from the drill bit (3).

2. The combined self-propelled grouting anchor bolt based on argillaceous soft rock according to claim 1, characterized in that, The inner tube (1) is provided with multiple intersecting positive threads (11) and negative threads (12) at the position between the drill bit (3) and the inner cavity (4), and the two ends of the positive threads (11) and negative threads (12) are smoothly connected together. The outer tube (2) is provided with a slider (10) in the inner wall corresponding to the position of the positive threads (11) and negative threads (12), and the slider (10) can slide in the positive threads (11) or negative threads (12).

3. A combined self-propelled grouting anchor bolt based on argillaceous soft rock according to claim 2, characterized in that, The slider (10) is oval-shaped, and its center is rotatably connected to the inner wall of the outer tube (2).

4. The combined self-propelled grouting anchor bolt based on argillaceous soft rock according to claim 1, characterized in that, The outer tube (2) has a keyway (7) extending along its axial direction on its outer wall, and a sealing device (8) is fitted on the outside of the outer tube (2). The keyway (7) and the sealing device (8) are slidably connected and have restricted rotation.

5. A combined self-propelled grouting anchor bolt based on argillaceous soft rock according to claim 1, characterized in that, The inner tube (1) has a valve cover (13) that can seal the inside of the inner tube (1) at the direction away from the drill bit (3) where the slurry outlet (5) is located. A rotating shaft (14) is fixed in the valve cover (13), and the two ends of the rotating shaft (14) can rotatably pass through the outer wall of the inner tube (1).

6. A combined self-propelled grouting anchor bolt based on argillaceous soft rock according to claim 5, characterized in that, The axis of the rotating shaft (14) is offset from the center of the valve cover (13), so that the valve cover (13) is divided into an upper cover and a lower cover by the rotating shaft (14).

7. A combined self-propelled grouting anchor bolt based on argillaceous soft rock according to claim 6, characterized in that, Multiple continuous ratchet rings (9) are formed in the inner wall of the inner cavity (4). The ratchet rings (9) face away from the drill bit (3). Guide plates (15) are fixed on one side of the lower cover of the valve cover (13) at both ends of the rotating shaft (14). The guide plates (15) can fit with the ratchet rings (9).

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