A Hollow Anchoring Pull-out Method for Slotted Pipe Anchors

Abstract

This invention discloses a method for pulling out hollow anchored slotted bolts, comprising the following steps: S1, anchor installation; S2, anchor anchoring; S3, connecting the pull-out device; connecting the exposed section of the anchor bolt to the pull-out device using a connecting nut, then adjusting the installation state of the connecting assembly to make it contact the rock wall and support the pull-out device; S4, anchor bolt pulling; using the pull-out device to pull out the anchor bolt, and recording the maximum pull-out force when the anchor bolt is pulled out or broken. During the rotational installation of the anchor bolt, the anchoring agent is injected, which can fully stir the anchoring agent to ensure uniform anchoring force on the anchor bolt. Based on this, the connecting assembly is installed and connected to the pull-out device. The connecting assembly stably supports the pull-out device to pull out the anchor bolt, and this method can be used to pull out any slotted bolt installed using this method. It is less constrained by factors and is simpler and more convenient to use.

Description

Technical Field

[0001] This invention belongs to the field of tunnel anchor bolt support technology, and particularly relates to a hollow anchoring and pull-out method for slotted pipe anchor bolts. Background Technology

[0002] Slotted bolt installation is characterized by its rapid and simple installation process, and is widely used in non-coal mines, representing an important bolt support technology. Its principle involves using a bolt drilling rig to drive slotted bolts into a borehole smaller than the bolt's outer diameter. The elasticity of the slotted bolt's steel pipe generates radial pressure on the borehole wall, creating frictional resistance between the bolt and the wall. Combined with the compressive stress of the bolt support plate, this places the surrounding rock in a triaxial stress state, thereby achieving the effect of reinforcing and controlling the stability of the surrounding rock.

[0003] After the installation of slotted pipe anchors, it is necessary to periodically check the pull-out force of the anchors to provide feedback on the construction quality and anchoring effect. Currently, there are two main methods for testing the pull-out force of slotted pipe anchors: welding and pre-installation of pull-out structures. Welding requires hot work, while pre-installation of pull-out structures can only be used on specified slotted pipe anchors. Both methods are complicated, subject to many constraints, and are very inconvenient to operate. Summary of the Invention

[0004] This invention addresses the problem that the existing technology for hollow anchor bolts involves cumbersome and inconvenient pull-out operations, and proposes the following technical solution:

[0005] A method for hollow anchoring and pull-out of a slotted pipe anchor bolt includes the following steps:

[0006] S1. Anchor bolt installation;

[0007] After drilling the installation hole with a drilling rig, insert the end of the anchor rod into the installation hole and inject anchoring agent into the installation hole;

[0008] S2, Anchor bolt anchoring;

[0009] Use a torque nut to connect the exposed section of the anchor rod to the mixer. The drilling rig, in conjunction with the mixer, rotates the anchor rod to mix the anchoring agent and pushes the anchor rod to the bottom of the installation hole. After the anchoring agent solidifies, the mixer is removed.

[0010] S3, Connecting the pull-out device;

[0011] Connect the exposed section of the anchor bolt to the pull-out device using the connecting nut, and then adjust the installation state of the connecting assembly to make it contact the rock wall to support the pull-out device;

[0012] S4, Anchor bolt pull-out;

[0013] Use a pull-out tester to pull out the anchor rod. When the anchor rod is pulled out or breaks, record the maximum pull-out force of the anchor rod.

[0014] As a preferred embodiment of the above technical solution, the connecting assembly includes a mounting base and multiple connecting brackets. One end of the connecting bracket is rotatably inserted into the mounting base, and the other end of the connecting bracket is rotatably inserted into a lead screw. One end of the lead screw is provided with an adjusting block, and the other end of the lead screw is provided with an abutment.

[0015] After the pull-out device is connected to the anchor rod, multiple connecting frames are pushed to deflect so that they are parallel to the anchor rod. The adjusting block is used to rotate the screw so that its end abutment contacts the rock wall. The pull-out device is supported by the connecting components and is stably set on the rock wall.

[0016] As a preferred embodiment of the above technical solution, the connecting assembly further includes a fixing component, which includes a fixing block that is movably inserted into the connecting frame. A return spring is fixedly connected between the fixing block and the connecting frame. A pushing block is provided on one side of the fixing block, and the pushing block is fixedly connected to the lead screw.

[0017] As a preferred embodiment of the above technical solution, the bottom of the pushing block is tapered, and the end of the fixing block matches the pushing block.

[0018] As a preferred embodiment of the above technical solution, the abutting member includes a mounting block and a rotating block rotatably inserted into the mounting block. The mounting block is rotatably sleeved on the surface of the lead screw, and the abutting block is rotatably inserted into the rotating block.

[0019] As a preferred embodiment of the above technical solution, a blocking block is provided on one side of the abutting block, and a screw that is threadedly connected to the mounting block is rotatably inserted on one side of the blocking block.

[0020] As a preferred embodiment of the above technical solution, a limiting rod is provided on the top of the mounting block, and one end of the limiting rod is movably inserted into the connecting frame.

[0021] As a preferred embodiment of the above technical solution, the connecting component includes a connecting cylinder, one end of which is provided with a support plate that fits against the rock wall, and the other end of which is fixedly connected to the pull-out instrument.

[0022] The beneficial effects of this invention are as follows:

[0023] 1. During the rotation and installation of the anchor rod, the anchoring agent is injected, which can fully mix the anchoring agent to ensure uniform anchoring force on the anchor rod. On this basis, the connecting component is installed and connected to the pull-out device. The connecting component stably supports the pull-out device to pull out the anchor rod. It can pull out any slotted pipe anchor rod installed using this method. It is less restricted by factors and is simpler and more convenient to use.

[0024] 2. The connection components can be adjusted to allow the screw end abutment to contact the uneven rock wall at different lengths, thereby stabilizing the pull-out instrument and preventing it from moving suddenly during the test, which could damage the equipment or injure personnel. It can also reduce errors caused by equipment instability, making the test results more accurate.

[0025] 3. The abutment part can be adjusted to maintain the maximum contact area with the rock wall surface, thus adapting to use on rock walls in more complex environments. No leveling work is required on the rock wall, and the pulling of the anchor bolts is simpler. Attached Figure Description

[0026] Figure 1 The diagram shown is a diagram of the anchorage state of the anchor bolt in Example 1;

[0027] Figure 2 The diagram shown is a pull-out state diagram of the anchor rod in Example 1;

[0028] Figure 3 The image shown is a front view of the connecting component in Embodiment 2;

[0029] Figure 4 The diagram shown is of the non-working state of the connecting component in Embodiment 2;

[0030] Figure 5 The diagram shown is a front sectional view of the connecting component in Embodiment 2;

[0031] Figure 6 The diagram shown is a schematic diagram of the various parts of the connecting component in Embodiment 2.

[0032] In the diagram: 11. Anchor bolt; 12. Anchoring agent; 13. Torque nut; 14. Mixer; 15. Connecting nut; 16. Pull-out device; 20. Connecting assembly; 21. Mounting base; 22. Connecting frame; 23. Lead screw; 24. Adjusting block; 25. Abutment; 251. Mounting block; 252. Rotating block; 253. Abutment block; 254. Blocking block; 255. Screw; 256. Limiting rod; 26. Fixing component; 261. Fixing block; 262. Return spring; 263. Pushing block. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings.

[0034] Example 1

[0035] Figures 1-2 A hollow anchoring and pull-out method for a slotted pipe anchor 11 includes the following steps:

[0036] S1, Anchor Bolt 11 Installation;

[0037] After drilling the installation hole with a drilling rig, insert the end of the anchor rod 11 into the installation hole and inject the anchoring agent 12 into the installation hole;

[0038] S2, anchor bolt 11 is anchored;

[0039] Use torque nut 13 to connect the exposed section of anchor rod 11 to mixer 14. The drilling rig, in conjunction with mixer 14, rotates anchor rod 11 to mix anchoring agent 12 and pushes anchor rod 11 to the bottom of installation hole. After anchoring agent 12 solidifies, mixer 14 is removed.

[0040] S3, Connect the pull-out device 16;

[0041] Use connecting nut 15 to connect the exposed section of anchor rod 11 to pull-out device 16, then adjust the installation state of connecting assembly 20 to make it contact the rock wall and support pull-out device 16;

[0042] S4, Anchor bolt 11 pull-out;

[0043] The anchor rod 11 is pulled out using a pull-out instrument 16. When the anchor rod 11 is pulled out or broken, the maximum pull-out force of the anchor rod 11 is recorded.

[0044] Figure 2 In the process, the connecting component 20 includes a connecting cylinder, one end of which is provided with a support plate that fits against the rock wall, and the other end of which is fixedly connected to the pull-out instrument 16.

[0045] The pulling device 16 consists of a hydraulic cylinder, a connecting rod, a manual pump, mounting washers, and nuts.

[0046] After the anchor bolt 11 is installed, a support plate is inserted at its tail end. The support plate fits against the flat rock wall surface. When the puller 16 is installed, the exposed section of the anchor bolt 11 is connected to the connecting rod through the connecting nut 15. Then, the connector and the oil cylinder are sequentially fitted onto the connecting rod. After the connecting assembly 20 is pressed tightly against the support plate, the gasket and nut are sequentially installed on the exposed section of the connecting rod at the rear end of the oil cylinder. The oil cylinder is connected to the manual pump through the oil pipe. This completes the connection and installation process between the exposed section of the anchor bolt 11 and the puller 16. The puller can then be pulled by turning on the manual pump. The connecting assembly 20 supports the puller 16, making the puller 16 pull the anchor bolt 11 more stably.

[0047] During the rotational insertion of the anchor rod 11, the anchoring agent 12 is injected, which can fully stir the anchoring agent 12 to make the anchoring force of the anchor rod 11 uniform. On this basis, the connecting component 20 is installed and connected to the pull-out device 16. The connecting component 20 stably supports the pull-out device 16 to pull out the anchor rod 11. It can pull out any slotted pipe anchor rod 11 installed using this method. It is less constrained and simpler and more convenient to use.

[0048] Example 2

[0049] Figures 3-6 In the process, the connecting assembly 20 includes a mounting base 21 and a plurality of connecting brackets 22. One end of the connecting bracket 22 is rotatably inserted into the mounting base 21, and the other end of the connecting bracket 22 is rotatably inserted into a lead screw 23. One end of the lead screw 23 is provided with an adjusting block 24, and the other end of the lead screw 23 is provided with an abutment 25.

[0050] After the pull-out device 16 is connected to the anchor rod 11, the multiple connecting frames 22 are pushed to deflect so that they are parallel to the anchor rod 11. The adjusting block 24 is used to rotate the screw 23 so that its end abutment 25 contacts the rock wall. The pull-out device 16 is supported by the connecting assembly 20 and is stably set on the rock wall.

[0051] The connecting assembly 20 also includes a fixing member 26, which includes a fixing block 261 that is movably inserted into the connecting frame 22. A return spring 262 is fixedly connected between the fixing block 261 and the connecting frame 22. A pushing block 263 is provided on one side of the fixing block 261, and the pushing block 263 is fixedly connected to the lead screw 23.

[0052] The bottom of the push block 263 is tapered, and the end of the fixing block 261 matches the push block 263.

[0053] After the pull-out device 16 is installed, push the multiple connecting frames 22 to deflect them so that they are parallel to the anchor rod 11. Use the adjusting block 24 to rotate the screw 23 so that its end abutment 25 moves. The pushing block 263 moves accordingly and comes into contact with the pushing block 263. Because the bottom of the pushing block 263 is tapered and the end of the fixing block 261 matches the pushing block 263, the fixing block 261 is pushed into the mounting base 21 by the pushing block 263. The connecting frame 22 is then fixed and restricted on the mounting base 21 to remain parallel to the anchor rod 11. When the abutment 25 contacts the rock wall, the pull-out device 16 is supported by the connecting assembly 20 and is stably set on the rock wall.

[0054] The connection component 20 can adjust the position of the abutment 25 at the end of the lead screw 23 to make it contact the uneven rock wall at different lengths, thereby stably supporting the pull-out instrument 16, preventing the pull-out instrument 16 from suddenly moving during the test, which could cause equipment damage or personnel injury, and can reduce errors caused by equipment instability, making the test results more accurate.

[0055] Figures 3-6 In this process, the abutment member 25 includes a mounting block 251 and a rotating block 252 rotatably inserted into the mounting block 251. The mounting block 251 is rotatably sleeved on the surface of the lead screw 23, and the abutment block 253 is rotatably inserted into the rotating block 252.

[0056] A blocking block 254 is provided on one side of the abutment block 253, and a screw 255 that is threadedly connected to the mounting block 251 is rotatably inserted on one side of the blocking block 254.

[0057] When the abutment 25 comes into contact with the rock wall, the rotating block 252 is adjusted to change the deflection and contact direction of the bottom abutment block 253. After part of the surface of the abutment block 253 comes into contact with the rock wall, the abutment block 253 automatically deflects and adjusts to maintain the maximum contact area with the surface of the rock wall. Then, the rotating screw 255 moves the position of the blocking block 254, and the blocking block 254 blocks the reverse movement path of the abutment 25, so as to avoid unstable support.

[0058] The abutment 25 can be adjusted to maintain the maximum contact area with the rock wall surface, thus adapting to use on rock walls in more complex environments. It eliminates the need for leveling the rock wall and simplifies the pulling of the anchor bolt 11.

[0059] Figures 3-6 In the middle, the top of the mounting block 251 is provided with a limiting rod 256, one end of which is movably inserted into the connecting frame 22.

[0060] The limiting rod 256 is used to restrict the movement path of the mounting block 251, thereby preventing the mounting block 251 from rotating with the rotation of the lead screw 23, thus ensuring the stability of the movement of the abutment 25.

[0061] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A hollow anchoring and pull-out method for a slotted pipe anchor (11), characterized in that, Includes the following steps: S1, Anchor bolt (11) installation; After drilling the installation hole with a drilling rig, insert the end of the anchor rod (11) into the installation hole and inject anchoring agent (12) into the installation hole. S2, Anchor bolt (11) anchoring; Use a torque nut (13) to connect the exposed section of the anchor rod (11) to the agitator (14). The drilling rig, in conjunction with the agitator (14), rotates the anchor rod (11) to agitate the anchoring agent (12) and pushes the anchor rod (11) to the bottom of the installation hole. After the anchoring agent (12) solidifies, remove the agitator (14). S3, Connect the pull-out instrument (16). Connect the exposed section of the anchor rod (11) to the pull-out device (16) using the connecting nut (15), and then adjust the installation state of the connecting assembly (20) to make it contact the rock wall to support the pull-out device (16); S4, Anchor bolt (11) pull-out; Use a pull-out instrument (16) to pull out the anchor rod (11). When the anchor rod (11) is pulled out or broken, record the maximum pull-out force of the anchor rod (11). The connecting assembly (20) includes a mounting base (21) and multiple connecting brackets (22). One end of the connecting bracket (22) is rotatably inserted into the mounting base (21), and the other end of the connecting bracket (22) is rotatably inserted into a lead screw (23). One end of the lead screw (23) is provided with an adjusting block (24), and the other end of the lead screw (23) is provided with an abutment (25). After the puller (16) is connected to the anchor rod (11), push the multiple connecting frames (22) to deflect so that they are parallel to the anchor rod (11), use the adjusting block (24) to rotate the screw (23) so that its end abutment (25) contacts the rock wall, and the puller (16) is supported by the connecting assembly (20) and stably set on the rock wall; The connecting assembly (20) further includes a fixing member (26), which includes a fixing block (261) that is movably inserted into the connecting frame (22). A return spring (262) is fixedly connected between the fixing block (261) and the connecting frame (22). A push block (263) is provided on one side of the fixing block (261), and the push block (263) is fixedly connected to the lead screw (23). The bottom of the push block (263) is tapered, and the end of the fixed block (261) matches the push block (263); The abutment (25) includes a mounting block (251) and a rotating block (252) rotatably inserted into the mounting block (251). The mounting block (251) is rotatably sleeved on the surface of the lead screw (23), and the abutment (253) is rotatably inserted into the rotating block (252). A blocking block (254) is provided on one side of the abutment block (253), and a screw (255) that is threadedly connected to the mounting block (251) is rotatably inserted on one side of the blocking block (254).

2. The hollow anchoring and pull-out method for a slotted anchor bolt (11) according to claim 1, characterized in that, The mounting block (251) is provided with a limiting rod (256) at the top, and one end of the limiting rod (256) is movably inserted into the connecting frame (22).

3. The hollow anchoring and pull-out method for a slotted anchor bolt (11) according to claim 1, characterized in that, The connecting component (20) includes a connecting cylinder, one end of which is provided with a support plate that fits against the rock wall, and the other end of which is fixedly connected to the pull-out instrument (16).

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