Self-propelled hollow grouting anchor rod with gas early warning and gas pumping and discharging functions

Abstract

The utility model provides a self-propelled hollow grouting anchor rod with gas early warning and gas pumping and discharging functions, which comprises a double-layer hollow rod body, wavy threads are arranged on the rod body, a self-propelled drill bit is arranged at the tail end of the rod body, the drill bit is fixedly connected with the rod body, a first grouting through hole and a second grouting through hole are arranged on the drill bit, and the first grouting through hole is communicated with the second grouting through hole. A gas through hole is formed in the side, close to the drill bit, of the rod body and communicated with an outer ring pipeline of the double-layer hollow rod body, the end, away from the drill bit, of the rod body is sleeved with a closed rubber sleeve, the closed rubber sleeve is fixed to the rod body, a metal tray is arranged on the side, away from the rod body, of the closed rubber sleeve, and the rod body penetrates through the closed rubber sleeve and the metal tray. According to the utility model, on the basis of ensuring the basic anchor rod function in the gas-containing stratum of the tunnel, the functions of pressure relief and pumping drainage of the stratum gas and grouting of the stratum can be realized, the high-precision monitoring of the gas concentration and the gas pressure is realized, and the safety of the construction process that the tunnel passes through the gas-containing stratum is greatly enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel and underground engineering anchoring equipment, and in particular to a self-propelled hollow grouting anchor with gas early warning and gas extraction functions. Background Art

[0002] Anchor support is an active support method, which is to anchor one end of the anchor rod in the rock formation and the other end outside the rock formation, and apply axial preload to it. It is widely used in underground projects, especially tunnel projects, due to its simple process, convenient construction, less consumables, low cost, good support effect, and strong adaptability to the formation environment.

[0003] With the continuous development of tunnel engineering construction in my country, the number of tunnels passing through various types of unfavorable geological strata is increasing, especially through various strata containing harmful gases. Tunnel gas disasters are a serious geological disaster, including gas explosions, gas outbursts, poisoning, combustion, etc. At present, the main means of dealing with stratum gas are a combination of gas monitoring and gas extraction. For the support and anchoring construction of gas strata in tunnels, it is necessary to understand the gas distribution in the strata and adjust the anchor parameters in time. The conventional method is to conduct advance drilling for gas detection and gas extraction, and then carry out anchor construction, but this method is inefficient and there are large errors in the detection of gas storage conditions in the rock strata at the anchoring position, which affects the safety of anchoring construction.

[0004] On the other hand, in view of the very complex underground geological environment, especially the strata containing harmful gases, the internal structure is diverse, and there are geological structures such as fissures, cracks and faults with poor structural properties. After anchor drilling, timely grouting reinforcement treatment with anchors is beneficial to increase the strength of the broken surrounding rock after drilling and improve the anchoring quality of the tunnel strata.

[0005] Therefore, on the whole, it is very necessary to design a self-propelled hollow grouting anchor with gas early warning and gas extraction functions for tunnel gas strata and in the field of tunnel and underground engineering anchoring equipment technology. Summary of the invention

[0006] The utility model aims to overcome the shortcomings of the single anchoring function of drilling holes in tunnels in gas-containing strata and the corresponding prevention and control measures for stratum gas, and provides a grouting anchor rod with gas early warning and gas extraction functions. When anchor rod pre-support is carried out in a tunnel in a gas-containing stratum, the anchor rod is used to give early warning of stratum gas pressure and gas concentration, and the gas in the surrounding rock is extracted in advance through the discharge hole, and then grouting is performed to reinforce the stratum. While providing stability for the surrounding rock in the gas-containing stratum, the risk of tunnel construction is reduced and the personal safety of construction workers is guaranteed.

[0007] To achieve the above purpose, the technical solution provided by the utility model is as follows:

[0008] A self-propelled hollow grouting anchor with gas early warning and gas extraction functions comprises a double-layer hollow rod body, a wavy thread is arranged on the rod body, a self-propelled drill bit is arranged at the end of the rod body, the drill bit is fixedly connected to the rod body, a through hole is opened on the drill bit, the through hole is connected to the internal pipeline of the double-layer hollow rod body, a gas through hole is arranged on the side of the rod body close to the drill bit, the gas through hole is connected to the outer ring pipeline of the double-layer hollow rod body, a closed rubber sleeve is sleeved on the end of the rod body away from the drill bit, the closed rubber sleeve is fixed to the rod body, a metal tray is arranged on the side of the closed rubber sleeve away from the rod body, the rod body passes through the closed rubber sleeve and the metal tray, the rod body extends a distance outside the tray, and adopts a fine thread design, a control box for controlling and adjusting grouting, gas detection, and gas discharge is connected to the left side of the tray through a connecting structure, and a grouting interface, a gas pipeline and a gas outlet closing valve are arranged on the outside of the control box.

[0009] At present, gas tunnels in gas strata are mainly coal-bearing strata and non-coal-bearing strata. The structural stability of coal-bearing strata is poor, and it is easy to have the danger of gas outburst. The structural development of non-coal-bearing strata is relatively complex. During construction and excavation, the requirements for surrounding rock stability are higher than those for conventional strata tunnels. At the same time, the risk of excessive gas concentration in the tunnel must also be taken into account. Therefore, this technical solution uses the external gas holes and internal gas channels of the anchor rods to extract the enriched gas in the local area of ​​the stratum in advance while pre-supporting the gas stratum tunnel. At the same time, the internal gas pressure monitoring elements and concentration monitoring elements are used to monitor the formation gas in real time. After the gas is released to a safe concentration and pressure range, the grouting joint is connected to the anchor rod grouting joint, and the slurry is injected into the loose stratum to ensure the strength and stability of the stratum and ensure safety for subsequent excavation.

[0010] The utility model adopts a double-layer rod body, the inner pipe is a grouting pipe, and the outer channel is a gas extraction channel. The functional zoning method can effectively avoid the grouting liquid backflow, while ensuring the efficiency of gas extraction. The main control structure of the utility model is the end control box, which can flexibly control the anchor rod to realize gas extraction and grouting operations by connecting different joints and adjusting the gas valve. The metal tray and the positive and negative threaded sleeves together press the rubber gasket to seal the connection between the anchor rod and the surrounding rock. A gas detection element is arranged inside the control box, which can effectively detect the concentration and pressure of gas and transmit it to the external terminal through the wire to realize the early warning of harmful gases. The utility model can continuously complete drilling, anchoring, gas concentration, pressure monitoring, and formation grouting in one construction, improve the subsequent construction speed and gas prevention and control work efficiency, and ensure the construction safety while ensuring the excavation period of the gas formation section.

[0011] The control box has a hollow structure inside and is fixed to the rod body by a threaded sleeve. A grouting interface is provided on the outside of the control box and is connected to the grouting pipeline. A gas control valve and a data export line 12 are provided on one side of the grouting interface, which are connected to the internal spherical plug by a connecting rod, and a gas concentration monitoring element and a pressure monitoring element are also provided on the inner wall.

[0012] The gas control valve is integrally connected to the internal spherical plug, which is made of stainless steel to block the air inlet of the control vent.

[0013] The vent hole is located on the rubber pad, and the aperture of the vent hole is slightly smaller than the maximum cross-sectional diameter of the internal spherical plug. The gas is sealed or discharged by controlling the gas control valve.

[0014] The rubber pad is also provided with a grouting channel which is connected to the grouting interface outside the control box.

[0015] A positive and negative thread sleeve is provided at one end of the control box close to the rod body. The positive and negative thread sleeve can be fixed at both ends, and the threaded connection at both ends can be achieved by rotating in only one direction. The two ends of the positive and negative thread sleeve are respectively connected to the rod body and the control box.

[0016] A check valve is connected to one end of the control box close to the rod body, and the check valve controls the grouting slurry to flow in one direction only, preventing the slurry from flowing back.

[0017] The front end of the drill bit is a solid part with a grouting through hole, the rear end is a hollow structure, the inner ring is a threaded structure, and is connected to the grouting pipe in the rod body through a thread. The surface is also provided with a grouting through hole. The grouting channel is an integrated structure, which is fixed to the outer layer by welding at the end of the rod body 1, extends to the rear end of the drill bit, and is connected to the check valve at the same time. The connection method is through a short section of retractable plastic hose with nuts at both ends.

[0018] 1. While pre-supporting a tunnel in a gas formation, the utility model utilizes the external gas through holes and internal gas channels of the anchor rod to extract the enriched gas in the local area of ​​the formation in advance, and utilizes the internal gas pressure monitoring element and the concentration monitoring element to monitor the formation gas in real time; after the gas is released to a safe concentration and pressure range, the grouting joint is connected to the anchor rod grouting joint, and the slurry is injected into the loose formation to ensure the strength and stability of the formation and ensure safety for subsequent excavation.

[0019] 2. The utility model adopts a double-layer rod body, the inner pipe is a grouting pipe, and the outer channel is a gas extraction channel. The functional zoning method can effectively avoid the reflux of grouting liquid and ensure the efficiency of gas extraction. The main control structure of the utility model is the end control box. By connecting different joints and adjusting the gas channel valve, the anchor rod can be flexibly controlled to realize gas extraction and grouting operations. The metal tray and the positive and negative threaded sleeves are pressed together to tighten the rubber gasket to seal the connection with the surrounding rock. A gas detection element is arranged inside the control box, which can effectively detect the concentration and pressure of gas and transmit it to the external terminal through the wire to realize the early warning of harmful gas.

[0020] 3. The main control structure of the utility model adopts a detachable end control box with a gas detection element arranged inside. The sequence of formation gas extraction and formation grouting is controlled by adjusting the external valve. The spherical plug is used to isolate the slurry from entering the box to ensure the safety of the gas detection element. At the same time, the detachable structure connected by the positive and negative thread sleeve can ensure the multiple use of the control box and save the cost of using the device.

[0021] 4. When connecting the control box and the rod body, the utility model uses a section of retractable plastic hose to connect the inner grouting pipe and the check valve at the outer end of the control box. This method can effectively isolate the grouting liquid from entering the control box. At the same time, the retractable and bendable nature of the retractable plastic hose ensures the effective connection between the control box and the rod body. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the utility model;

[0023] Figure 2 Schematic diagram of the external and internal structure of the control box;

[0024] Figure 3 This is a schematic diagram of the structure of one side of the control box connecting rod;

[0025] Figure 4 Schematic diagram of drill bit structure;

[0026] Figure 5 Schematic diagram of the rod structure.

[0027] The figure shows: 1-rod body, 2-self-feeding drill bit, 3-sealed rubber sleeve, 4-metal tray, 5-connection structure, 6-control box, 7-gas extraction pipeline, 8-gas control valve, 9-grouting interface, 10-positive and negative threaded sleeve, 11-check valve, 12-data export line, 101-gas through hole, 102-grouting pipeline, 201-first grouting through hole, 202-second grouting through hole, 601-spherical plug, 602-gas concentration monitoring element, 603-vent, 604-rubber pad, 605-grouting channel, 606-gas pressure monitoring element. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the utility model more clear, the following embodiments and drawings are combined to describe the present invention.

[0029] The present invention will be further described in detail. The exemplary implementation modes and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention. Example 1

[0030] like Figure 1-5 As shown, the present embodiment relates to a self-propelled hollow grouting anchor with gas early warning and gas extraction functions, comprising a double-layer hollow rod body 1, a wavy thread is arranged on the rod body, a self-propelled drill bit 2 is arranged at the end of the rod body, the drill bit is connected to the rod body through a thread, a first grouting through hole 201 and a second grouting through hole 202 are opened on the drill bit 2, a gas through hole 101 is arranged on the side of the rod body 1 close to the drill bit, the gas through hole 101 is connected with the outer ring pipeline of the double-layer hollow rod body 1, a closed rubber sleeve 3 is sleeved on the end of the rod body 1 away from the drill bit, the closed rubber sleeve 3 is fixed to the rod body 1, a metal tray 4 is arranged on the side of the closed rubber sleeve 3 away from the rod body, the rod body passes through the closed rubber sleeve 3 and the metal tray 4 The rod body extends a short distance outside the tray and adopts a fine thread design. A control box 6 for controlling and adjusting grouting, gas detection, and gas emission is connected to the left side of the tray through a connecting structure 5. A grouting interface 9, a gas extraction pipeline 7, and a gas control valve 9 are arranged on the outside of the control box; the interior of the control box 6 is a hollow structure, and is connected and fixed to the rod body 1 by a threaded sleeve. A grouting interface 9 is arranged on the outside of the control box, which is connected to the grouting pipeline 605; a gas control valve 8 and a data export line 12 are arranged on one side of the grouting interface 9, which are connected to the internal spherical plug 601 through a connecting rod, and a gas concentration monitoring element 602 and a pressure monitoring element 606 are also arranged on the inner wall.

[0031] The gas concentration and gas pressure monitoring components in this embodiment are electronic components that can be purchased in large quantities in the prior art. They all have their own micro power supply inside and their surfaces are made of explosion-proof insulating materials to prevent accidents caused by sparks during gas extraction.

[0032] In this embodiment, the gas control valve 8 is integrally connected to the internal spherical plug 601.

[0033] 601 is made of stainless steel to block the air intake of the control vent hole 603. The vent hole 603 is located on the rubber pad 604, and the aperture of the vent hole is slightly smaller than the maximum cross-sectional diameter of the internal spherical plug 601. The gas is blocked or discharged by the control of the gas control valve 8.

[0034] In this embodiment, a grouting channel 605 is provided on the rubber pad 604 and is connected to the grouting interface 9 outside the control box 6.

[0035] In this embodiment, the control box is provided with a positive and negative thread sleeve 10 at one end close to the rod body, and the positive and negative thread sleeve 10 can be fixed at both ends, and can be threadedly connected at both ends by rotating in only one direction, and the two ends of the positive and negative thread sleeve are respectively connected to the rod body 1 and the control box 6. The control box 6 is connected to a check valve 11 at one end close to the rod body, and the check valve 11 controls the grouting slurry to flow in only one direction to prevent the slurry from flowing back.

[0036] In this embodiment, the front end of the drill bit is a solid part, provided with a second grouting hole 202, the rear end is a hollow structure, the inner ring is a threaded structure, and is connected to the grouting pipe 102 in the rod body by a thread. The surface is also provided with a first grouting hole 201. The grouting pipe 102 is an integrated structure, fixed to the outer layer by welding at the end of the rod body 1, extending to the rear end of the drill bit, and connected to the check valve 11 at the same time, and the connection method is to connect through a short section of retractable plastic hose. Example 2

[0037] like Figure 2 As shown, the end control box of this embodiment is provided with gas detection elements 602 and 606 inside. The sequence of formation gas extraction and formation grouting is controlled by adjusting the external gas control valve 8. The spherical plug 601 is used to isolate the slurry from entering the box to ensure the safety of the gas detection elements. At the same time, the detachable structure connected by the positive and negative threaded sleeve 10 can ensure the multiple uses of the control box and save the cost of using the device.

[0038] In this embodiment, first, the external negative pressure extraction equipment is connected to the pipeline 7, the gas control valve 8 is opened, the spherical plug 601 is separated from the control vent 603, the extraction channel is opened, and then the formation gas is extracted; after the gas monitoring element outputs data to a safe range, the gas control valve 8 is closed, the spherical plug 601 is pressed against the control vent 603, the extraction channel is closed, and then the external grouting equipment and the grouting interface 9 are connected to perform the formation grouting reinforcement operation.

[0039] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. Self-propelled hollow grouting anchor with gas early warning and gas extraction functions, characterized by: The invention comprises a double-layer hollow rod body (1), a wavy thread is arranged on the rod body, a self-feeding drill bit (2) is arranged at the end of the rod body, and the drill bit (2) and the rod body are connected to each other. (1) is fixedly connected, a first grouting through hole (201) and a second grouting through hole (202) are formed on the drill bit (2), a gas through hole (101) is formed on the side of the rod body (1) close to the drill bit, the gas through hole (101) is communicated with the outer ring pipe of the double-layer hollow rod body (1), a closed rubber sleeve (3) is sleeved on the end of the rod body (1) away from the drill bit, the closed rubber sleeve (3) is fixed to the rod body (1), a metal tray (4) is provided on the side of the closed rubber sleeve (3) away from the rod body, the rod body passes through the closed rubber sleeve (3) and the metal tray (4), the rod body extends to a distance outside the tray, and adopts a fine thread design, and a control box (6) for controlling and adjusting grouting, gas detection, and gas discharge is connected on the left side of the tray through a connection structure (5), and a grouting interface (9), a gas extraction pipeline (7), a gas control valve (8) and a data export line (12) are provided on the outside of the control box.

2. The self-propelled hollow grouting anchor with gas early warning and gas extraction functions according to claim 1, characterized in that: The control box (6) is hollow in structure and is connected and fixed to the rod body (1) via a positive and negative threaded sleeve. A grouting interface (9) is provided on the outside of the control box and is connected to the grouting channel (605). A gas control valve (8) is provided on one side of the grouting interface (9) and is connected to the internal spherical plug (601) via a connecting rod. A gas concentration monitoring element (602) and a pressure monitoring element (606) are also provided on the inner wall.

3. The self-propelled hollow grouting anchor with gas early warning and gas extraction functions according to claim 2 is characterized in that: The gas control valve (8) is integrally connected to the internal spherical plug (601), and the internal spherical plug (601) is made of stainless steel to block the air intake of the control vent hole (603).

4. The self-propelled hollow grouting anchor with gas early warning and gas extraction functions according to claim 3 is characterized in that: The vent hole (603) is located on the rubber pad (604), and the aperture of the vent hole is slightly smaller than the maximum cross-sectional diameter of the internal spherical plug (601), and is controlled by the gas control valve (8) to seal or discharge gas.

5. The self-propelled hollow grouting anchor with gas early warning and gas extraction functions according to claim 4 is characterized in that: The rubber pad (604) is also provided with a grouting channel (605) which is connected to the grouting interface (9) outside the control box (6).

6. The self-propelled hollow grouting anchor with gas early warning and gas extraction functions according to claim 1 is characterized in that: The connection structure (5) is provided with a positive and negative thread sleeve (10), and the positive and negative thread sleeve (10) can be fixed at both ends, and can achieve threaded connection at both ends by rotating in only one direction, and the two ends of the positive and negative thread sleeve are respectively connected to the rod body (1) and the control box (6).

7. The self-propelled hollow grouting anchor with gas early warning and gas extraction functions according to claim 1 is characterized in that: One end of the control box (6) close to the rod body is connected to a check valve (11), and the check valve (11) controls the grouting slurry to flow in only one direction, thereby preventing the slurry from flowing back.

8. The self-propelled hollow grouting anchor with gas early warning and gas extraction functions according to claim 1, characterized in that: The front end of the drill bit (2) is a solid part, provided with a second grouting through hole (202), and the rear end is a hollow structure, the inner ring of which is a threaded structure, and is connected to the grouting pipe (102) in the rod body (1) through a thread, and the surface is also provided with a first grouting through hole (201).

9. The self-propelled hollow grouting anchor with gas early warning and gas extraction functions according to claim 8, characterized in that: The grouting pipe (102) is an integrated structure, fixed to the outer layer by welding at the end of the rod body (1), extending to the rear end of the drill bit, and connected to the check valve (11) by a short section of retractable plastic hose with nuts at both ends.

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