A tunnel rock grouting and plugging device for preventing gas outburst

Abstract

The present invention relates to the technical field of tunnel rock plugging, and specifically to a tunnel rock grouting plugging device for preventing gas outburst, comprising a base, a grouting machine body being installed on the base, a grouting pipe being connected and installed on the grouting machine body, and a quick connector being installed on the grouting pipe. After the construction personnel have arranged the device, as the high-pressure air pump is turned on, the airflow drives the supporting mechanism to centrally fix one end of the sealing pipe located in an inner bag in a pre-punched sealing hole in the rock formation, the auxiliary mechanism reduces the force of the construction personnel holding the end of the sealing pipe located in an outer bag, the construction personnel can easily make the sealing pipe and the sealing hole in a coaxial position, as the high-pressure air pump continues to operate, the support mechanism and the sealing hole are fixed more firmly, and when a certain pressure is reached, with the cooperation of the switching mechanism and the drainage hood, the high-pressure airflow cleans the gravel in the sealing hole, the operation is simple, and the use is convenient.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel rock plugging, in particular to a tunnel rock grouting plugging device for preventing gas outburst. Background Art

[0002] In tunnel engineering, especially in areas with complex geological conditions and rich coal seams (such as Shanxi and areas west and north of it), the risk of gas outbursts has increased significantly, posing a serious threat to tunnel construction safety and the safety of life and property. In order to effectively prevent gas outbursts, the traditional method is to use a bladder sealer in combination with a grouting machine to perform rock grouting. The basic working principle of this method is: first, install the bladder sealer in a pre-drilled hole. The sealer consists of an inner bag and an outer bag. Grouting is performed into the space between the two bags, and the pressure continuously output by the grouting machine is used to make the slurry penetrate into the rock gaps, thereby achieving the purpose of blocking gas.

[0003] However, in the application of gas-rich rock mass, this traditional method has many shortcomings, especially for the sealing problem after gas blocking. Those skilled in the art have proposed some solutions, such as the patent with application number CN201710312759.7 on the China Patent Network. This patent proposes a gas prevention method of regional grouting combined with anti-seepage support when the tunnel passes through the coal seam. This method uses a variety of protective means such as gas isolation rings, gas sealants, gas isolation plates, foam cushions, etc. to achieve gas leakage prevention. Although this method improves the effect of gas blocking to a certain extent, some disadvantages still occur in the actual construction process:

[0004] 1. After the drilling equipment drills a hole in the rock wall, there is often a lot of gravel left in the completed plugging hole. These gravels are not only difficult to clean (due to the small diameter and deep depth of the plugging hole), but also have an adverse effect on the fixation of the burr hole sealer. The presence of gravel may cause the sealer to move during the grouting process, thereby affecting the grouting effect. More seriously, if the gravel is stacked in the plugging hole, the slurry may not be able to fully penetrate all the gaps after grouting, causing gas to gradually seep out from the gaps between the gravel, which in turn causes a safety accident.

[0005] 2. During the grouting process, a construction worker is always required to observe the water flow of the return pipe and the value of the pressure gauge, and to promptly determine whether the sealing section has been filled through the changes in the pressure gauge and the return pipe. During this period, a high degree of concentration is required, and the light inside the tunnel is not suitable for long-term observation by the human body. A single day's work consumes a lot of energy for the construction workers and causes severe damage to their eyesight.

[0006] In summary, the existing tunnel rock grouting and plugging device still has some shortcomings in preventing gas outburst. Therefore, a device that can overcome the above defects is needed. To this end, we propose a tunnel rock grouting and plugging device for preventing gas outburst. Summary of the invention

[0007] In order to solve the above technical problems, the present invention provides a tunnel rock grouting plugging device for preventing gas outburst, comprising a base, a grouting machine body is installed on the base, a pressure gauge is connected to the grouting machine body, a grouting pipe is connected to the grouting machine body, a quick connector is installed on the grouting pipe, and further comprising:

[0008] A sealing tube, wherein the two ends of the sealing tube are respectively sleeved with an inner bag and an outer bag, a first through pipe is installed between the inner bag and the outer bag, a bursting valve is arranged on the first through pipe, a slurry inlet pipe is connected to the outer bag, and one end of the slurry inlet pipe away from the outer bag is connected to the quick connector, and a return water pipe is installed on the sealing tube;

[0009] A high-pressure air pump, the high-pressure air pump is mounted on a base, the high-pressure air pump is connected to a first hose, a side of the first hose away from the high-pressure air pump is sleeved with a fixing frame, one end of the first hose is provided with a sealing joint, the sealing joint is butt-jointed with a side of the sealing tube close to the outer bag, and the quick joint is detachably fixed to the fixing frame;

[0010] A support mechanism, the support mechanism is installed in the sealing tube and is located at one end close to the inner bag. The support mechanism uses the wind force generated by the high-pressure air pump as a power source to fix the end of the sealing tube located at the inner bag in the center of the sealing hole pre-drilled in the rock formation;

[0011] An auxiliary mechanism, the auxiliary mechanism is installed in the sealing tube and is located near one end of the outer bag. After the sealing tube is inserted into the pre-drilled plugging hole in the rock formation, the auxiliary mechanism assists the construction personnel to fix the end of the sealing tube located at the outer bag in the center of the pre-drilled plugging hole in the rock formation;

[0012] A switching mechanism, wherein the switching mechanism is installed on the sealing tube and connected to the supporting mechanism. After the supporting mechanism fixes one end of the sealing tube located in the inner bag in the center of the pre-drilled sealing hole in the rock formation, the air pressure of the high-pressure air pump drives the supporting mechanism to stop expanding the support, and the switching mechanism drives the air pressure to clean the inside of the sealing hole;

[0013] The monitoring mechanism is installed on a fixed frame and connected to the return pipe and the pressure gauge. The monitoring mechanism monitors the water flow size in the return pipe and the change of the pressure gauge. After the change value when the plugging hole is full is reached, the working state of the grouting machine body is stopped.

[0014] Preferably, the supporting mechanism comprises a supporting frame fixed in the sealing tube, the supporting frame comprising a first inner ring, a first outer ring and a supporting rod connecting the first inner ring and the first outer ring; a Tang bolt is installed through the center of the supporting frame, a nut is sleeved on the Tang bolt, there are two nuts, and the inner threads are in opposite directions; a fixing seat is installed on the outer walls of the two nuts, each of the nuts is provided with no less than three fixing seats, and are evenly distributed in a ring shape; a first rotating rod is installed on the fixing seat through a rotating shaft, the first rotating rods on different nuts correspond to each other one by one, and the ends away from the corresponding fixing seats are also connected through a rotating shaft; a sliding groove is provided on the nuts, and there are several sliding grooves; a limiting rod is installed on the supporting rod, and the limiting rod is located inside the sliding groove; and a linking piece is also included in the sealing tube, and the linking piece uses the wind force generated by the high-pressure air pump as a power source to drive the two nuts close to each other, thereby driving the first rotating rods on different nuts to be in close contact with the inner wall of the sealing hole.

[0015] Preferably, a drainage cover is installed at the top end of the limiting rod, and the drainage cover is in a cover shape.

[0016] Preferably, the linkage comprises a screw rod mounted on a Tang bolt, a second inner ring is sleeved on the screw rod, a screw groove matching with the screw rod is formed on the inner wall of the second inner ring, a guide rod is relatively mounted on the inner wall of the sealing tube, a second outer ring is slidably connected to the guide rod, and a fragile plate and a connecting plate are connected between the second inner ring and the second outer ring.

[0017] Preferably, the auxiliary mechanism includes a ring sleeved on the sealing tube, the ring is provided with a groove, and there are several grooves in a ring array, and a second rotating rod is installed in the groove through a rotating shaft, and a torsion spring is sleeved on the second rotating rod, one end of the torsion spring is fixed to the second rotating rod, and the other end is fixed to the groove.

[0018] Preferably, the switching mechanism includes a fragile point opened on the fragile plate, an air pipe is installed on the fragile plate, the air pipe and the fragile point are coaxially arranged, an air ring is installed on the air pipe, the air ring is coaxially arranged with the screw, the bottom surface of the air ring is relatively connected to a piston cylinder, a piston block is arranged in the piston cylinder, a screen is fixed under the piston block by a connecting rod, the screen is penetrated by the air pipe, and the two are slidably connected, a hollow needle tube is arranged on the sieve holes of the screen, and the sharp end of the hollow needle tube is opposite to the fragile plate.

[0019] Preferably, the monitoring mechanism includes a docking seat installed on a fixed frame, the docking seat is cylindrical and connected to the end of the return pipe away from the sealing pipe, a positive pole and a negative pole are arranged in the docking seat, the positive pole and the negative pole are coaxially arranged, and one is long and the other is short, a single positive pole and a negative pole form a group of sensing parts, there are multiple groups of sensing parts, and they are distributed up and down, the gaps between the positive poles and the negative poles of a single group are spirally distributed, the end of the docking seat away from the return pipe is connected to a drain pipe, and the monitoring mechanism also includes an angle sensor arranged on the pointer of the pressure gauge.

[0020] Preferably, the injection slurry inside the grouting machine body is added with an airtight agent.

[0021] The present invention has at least the following beneficial effects:

[0022] 1. During the grouting of the rock mass in the tunnel, the construction personnel only need to control the switch of the high-pressure air pump on the basis of the traditional operation. The use method does not require special training and is suitable for promotion. In addition, during the construction process, when the water flow in the return pipe drops to a certain level and the pressure gauge reaches the set value, the grouting machine body will automatically stop working, and the construction personnel do not need to observe for a long time, which greatly reduces the mental consumption of the construction personnel;

[0023] 2. After the construction personnel have arranged the device, with the start of the high-pressure air pump, the airflow drives the supporting mechanism to fix the end of the sealing tube located in the inner bag in the center of the pre-drilled sealing hole in the rock formation. The auxiliary mechanism reduces the force of the construction personnel holding the end of the sealing tube located in the outer bag, and the construction personnel can easily make the sealing tube and the sealing hole in a coaxial position. With the continuous operation of the high-pressure air pump, the support mechanism and the sealing hole are fixed more firmly. When a certain pressure is reached, with the cooperation of the switching mechanism and the drainage hood, the high-pressure airflow cleans the gravel in the sealing hole. The operation is simple and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a front view structural schematic diagram of the present invention;

[0026] Figure 3 For the present invention Figure 2 Schematic diagram of the structure at A in the middle;

[0027] Figure 4 For the present invention Figure 2 Schematic diagram of the structure at B in the middle;

[0028] Figure 5 For the present invention Figure 4 Schematic diagram of the structure at C in the middle;

[0029] Figure 6 A schematic diagram of the sealing tube and its connecting parts of the present invention;

[0030] Figure 7 It is a front view structural diagram of the support mechanism and the switching mechanism of the present invention;

[0031] Figure 8 For the present invention Figure 7 Schematic diagram of the structure at D in the middle;

[0032] Fig. 9 It is a bottom view structural diagram of the support mechanism and the switching mechanism of the present invention;

[0033] Fig.10 It is a schematic diagram of the top view of the supporting mechanism and the switching mechanism of the present invention;

[0034] Fig.11 It is a schematic diagram of the structure of the linkage member in the switching mechanism of the present invention.

[0035] In the figure: 1, base; 11, grouting machine body; 111, grouting pipe; 112, quick connector; 113, pressure gauge; 2, sealing pipe; 21, inner bag; 22, outer bag; 23, first through pipe; 24, bursting valve; 25, slurry inlet pipe; 26, return pipe; 3, high-pressure air pump; 31, first hose; 32, fixing frame; 33, sealing joint; 4, supporting mechanism; 41, supporting frame; 42, first inner ring; 43, first outer ring; 44, supporting rod; 45, Tang bolt; 46, nut; 47, fixing seat; 48, first rotating rod; 49, slide groove; 410, limit rod; 411, linkage; 411 1. Screw; 4112. Second inner ring; 4113. Screw groove; 4114. Guide rod; 4115. Second outer ring; 4116. Fragile plate; 4117. Connecting plate; 5. Auxiliary mechanism; 51. Ring; 52. Groove; 53. Second rotating rod; 54. Torsion spring; 6. Switching mechanism; 61. Fragile point; 62. Air pipe; 63. Air ring; 64. Piston cylinder; 65. Piston block; 66. Connecting rod; 67. Screen; 68. Hollow needle tube; 7. Drainage hood; 8. Monitoring mechanism; 81. Docking seat; 82. Positive pole; 83. Negative pole; 823. Inductive component; 84. Drain pipe; 85. Angle sensor. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Embodiment 1:

[0037] See also Figure 1-Figure 11 The present invention provides a technical solution: a tunnel rock grouting plugging device for preventing gas outburst, comprising a base 1, a grouting machine body 11 is installed on the base 1, a grouting pipe 111 is connected and installed on the grouting machine body 11, a quick connector 112 is installed on the grouting pipe 111, a pressure gauge 113 is connected to the grouting machine body 11, and further comprising:

[0038] A sealing tube 2, wherein the two ends of the sealing tube 2 are respectively sleeved with an inner bag 21 and an outer bag 22, a first through pipe 23 is installed between the inner bag 21 and the outer bag 22, a bursting valve 24 is arranged on the first through pipe 23, a slurry inlet pipe 25 is connected to the outer bag 22, and one end of the slurry inlet pipe 25 away from the outer bag 22 is connected to the quick connector 112, and a return pipe 26 is installed on the sealing tube 2;

[0039] A high-pressure air pump 3, the high-pressure air pump 3 is installed on the base 1, the high-pressure air pump 3 is connected with a first hose 31, a side of the first hose 31 away from the high-pressure air pump 3 is sleeved with a fixing frame 32, one end of the first hose 31 is provided with a sealing joint 33, the sealing joint 33 is connected to a side of the sealing tube 2 close to the outer bag 22, and the quick connector 112 is detachably fixed to the fixing frame 32;

[0040] A support mechanism 4 is installed in the sealing tube 2 and is located at one end close to the inner bag 21. The support mechanism 4 uses the wind force generated by the high-pressure air pump 3 as a power source to fix the end of the sealing tube 2 located at the inner bag 21 in the center of the sealing hole pre-drilled in the rock formation;

[0041] Auxiliary mechanism 5, the auxiliary mechanism 5 is installed in the sealing tube 2, and is located near one end of the outer bag 22. After the sealing tube 2 is inserted into the pre-drilled plugging hole in the rock formation, the auxiliary mechanism 5 assists the construction personnel to fix the end of the sealing tube 2 located at the outer bag 22 in the center of the pre-drilled plugging hole in the rock formation;

[0042] The switching mechanism 6 is installed on the sealing tube 2 and connected to the supporting mechanism 4. After the supporting mechanism 4 fixes one end of the sealing tube 2 located in the inner bag 21 in the center of the pre-drilled plugging hole in the rock formation, the air pressure of the high-pressure air pump 3 drives the supporting mechanism 4 to stop expanding the support, and drives the air pressure through the switching mechanism 6 to clean the inside of the plugging hole;

[0043] The monitoring mechanism 8 is installed on the fixing frame 32 and connected with the return pipe 26 and the pressure gauge 113. The monitoring mechanism 8 monitors the water flow in the return pipe 26 and the change of the pressure gauge 113. When the change value when the plugging hole is filled is reached, the working state of the grouting machine body 11 is stopped.

[0044] The support mechanism 4 includes a support frame 41 fixed in the sealing tube 2, and the support frame 41 is composed of three parts: a first inner ring 42, a first outer ring 43, and a support rod 44 connecting the first inner ring 42 and the first outer ring 43. A Tang bolt 45 is installed through the center of the support frame 41, and a nut 46 is sleeved on the Tang bolt 45. There are two nuts 46, and the internal threads are in opposite directions. A fixing seat 47 is installed on the outer wall of the two nuts 46. Each nut 46 is provided with no less than three fixing seats 47, which are evenly distributed in a ring shape. The fixing seats 47 are installed by a rotating shaft. There is a first rotating rod 48, and the first rotating rods 48 located on different nuts 46 correspond to each other one by one, and the ends away from the corresponding fixing seats 47 are also connected by a rotating shaft. The nuts 46 are provided with sliding grooves 49, and there are several sliding grooves 49. A limiting rod 410 is installed on the support rod 44, and the limiting rod 410 is located inside the sliding groove 49. It also includes a connecting piece 411 installed in the sealing tube 2. The connecting piece 411 uses the wind force generated by the high-pressure air pump 3 as a power source to drive the two nuts 46 to approach each other, thereby driving the first rotating rods 48 located on different nuts 46 to be close to the inner wall of the sealing hole.

[0045] The linkage 411 includes a screw rod 4111 installed on the Down's bolt 45, a second inner ring 4112 is sleeved on the screw rod 4111, a screw groove 4113 matching with the screw rod 4111 is formed on the inner wall of the second inner ring 4112, a guide rod 4114 is installed relative to the inner wall of the sealing tube 2, a second outer ring 4115 is slidably connected to the guide rod 4114, and a fragile plate 4116 and a connecting plate 4117 are connected between the second inner ring 4112 and the second outer ring 4115.

[0046] The connecting plate 4117 is used to directly connect the second inner ring 4112 and the second outer ring 4115 to prevent the fragile plate 4116 from being damaged by the stress applied by the second inner ring 4112 during the rotation process.

[0047] The construction workers use a transfer device, such as a cart, a forklift, etc., or directly add wheels to the base 1 of the present application to transfer the grouting machine body 11 to the position where grouting and sealing are required, and then connect the first hose 31 connected to the high-pressure air pump 3 and the sealing tube 2 through the sealing joint 33, and insert the sealing tube 2 into the sealing hole, and then turn on the high-pressure air pump 3. As the high-pressure airflow generated by the high-pressure air pump 3 enters the sealing tube 2 through the first hose 31 and the sealing joint 33, the pressure inside the sealing tube 2 increases, and pressure is applied to the second inner ring 4112, the fragile plate 4116, and the second outer ring 4115. With the cooperation of rod 4114, the second inner ring 4112 can only move in a straight line. As the second inner ring 4112 moves, the screw groove 4113 on the inner wall of the second inner ring 4112 drives the screw 4111 to rotate, and the screw 4111 simultaneously drives the two nuts 46 to approach each other through the Down's bolt 45, and then drives the angle between the first rotating rod 48 to become smaller through the fixing seat 47 on the nut 46. The moving trajectory of the end of the first rotating rod 48 close to the nut 46 is always coaxial with the Down's bolt 45, and the end away from the nut 46 will get closer to the inner wall of the blocking hole until the end of the first rotating rod 48 away from the nut 46 is in close contact with the inner wall of the blocking hole.

[0048] The auxiliary mechanism 5 includes a ring 51 sleeved on the sealing tube 2, and a groove 52 is opened on the ring 51. There are a plurality of grooves 52 in a ring array, and a second rotating rod 53 is installed in each groove 52 through a rotating shaft. A torsion spring 54 is sleeved on the second rotating rod 53, and one end of the torsion spring 54 is fixed to the second rotating rod 53, and the other end is fixed to the groove 52.

[0049] After the sealing tube 2 is inserted into the sealing hole, the inner wall of the sealing hole presses the second rotating rod 53. As the second rotating rod 53 gets closer to the sealing tube 2, the force exerted on the torsion spring 54 becomes greater, and the torsion spring 54 applies a reaction force to the second rotating rod 53. The reaction force drives the sealing tube 2 at the entrance of the sealing hole to be coaxial with the sealing hole. The construction personnel only need to use a small force to support it to prevent the air pressure from being too high and shifting the sealing tube 2.

[0050] It should be noted that the end of the sealing tube 2 close to the inner bag 21 can also adopt the same design, which is lower in cost. However, this design saves more effort when inserting the sealing tube 2 into the sealing hole, and is more secure after being fixed. When the high-pressure airflow is used to clean the inside of the sealing hole later, the sealing tube 2 is also not easy to shift.

[0051] The switching mechanism 6 includes a fragile point 61 opened on the fragile plate 4116, an air pipe 62 is installed on the fragile plate 4116, the air pipe 62 is coaxially arranged with the fragile point 61, an air ring 63 is connected and installed on the air pipe 62, the air ring 63 is coaxially arranged with the screw 4111, the bottom surface of the air ring 63 is relatively connected with a piston cylinder 64, a piston block 65 is arranged in the piston cylinder 64, a screen 67 is fixed below the piston block 65 through a connecting rod 66, the screen 67 is penetrated by the air pipe 62, and the two are slidably connected, a hollow needle tube 68 is arranged on the sieve holes of the screen 67, and the sharp end of the hollow needle tube 68 is arranged opposite to the fragile plate 4116.

[0052] A drainage cover 7 is installed at the top end of the limiting rod 410, and the drainage cover 7 is in a cover shape.

[0053] After the first rotating rod 48 is fitted with the inner wall of the sealing hole, the high-pressure air pump 3 continues to pressurize the inside of the sealing tube 2. After reaching a certain pressure, the fragile point 61 on the fragile plate 4116 breaks under high pressure, and the high-pressure airflow enters the air ring 63 through the breaking point 61 and the air pipe 62, and drives the piston block 65 in the piston cylinder 64 to move. The piston block 65 drives the screen 67 to move, and the hollow needle tube 68 on the screen 67 moves to pierce the fragile plate 4116. The high-pressure airflow that loses the obstruction of the fragile plate 4116 is directly discharged from one end of the sealing tube 2, and under the guidance of the drainage hood 7, the high-pressure airflow cleans the gravel in the sealing hole.

[0054] The monitoring mechanism 8 includes a docking seat 81 installed on the fixing frame 32, the docking seat 81 is cylindrical and connected to the end of the return pipe 26 away from the sealing pipe 2, a positive pole 82 and a negative pole 83 are arranged in the docking seat 81, the positive pole 82 and the negative pole 83 are coaxially arranged, and one is long and the other is short, a single positive pole 82 and a negative pole 83 form a group of sensing elements 823, there are multiple groups of sensing elements 823, and they are distributed up and down, the gaps between the positive poles 82 and the negative poles 83 between the single groups are spirally distributed, the end of the docking seat 81 away from the return pipe 26 is connected to a drain pipe 84, and the monitoring mechanism 8 also includes an angle sensor 85 arranged on the pointer of the pressure gauge 113.

[0055] The injection slurry inside the grouting machine body 11 is added with an airtight agent.

[0056] After the gravel in the plugging hole is cleared, the high-pressure air pump 3 can be turned off and the grouting machine body 11 can be turned on. The grouting machine body 11 will fill the outer bag 22, the first through pipe 23 and the inner bag 21 with the slurry of the mixed airtight agent through the grouting pipe 25 and the grouting pipe 111. The outer bag 22 and the inner bag 21 will block a section in the middle of the sealing pipe 2. As the grouting of the grouting machine body 11 continues, the bursting valve 24 is damaged, and the rock mass in the tunnel is grout-sealed. At the same time, the return pipe 26 starts to drain water. When the return pipe 26 is When the flow rate in 26 is large, the positive pole 82 and the negative pole 83 are in a conductive state under the action of the water flow. As the slurry blocks the rock mass, the water flow in the return pipe 26 decreases. The water as a conductive medium will only contact the positive pole 82 or the negative pole 83 of one group of sensing parts 823. At this time, the water flow is small. When the pointer on the subsequent pressure gauge 113 increases to 2Mpa, the angle sensor 85 can monitor it. At this time, the grouting section is full and the grouting machine body 11 automatically stops working.

[0057] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0058] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tunnel rock grouting plugging device for preventing gas outburst, comprising a base (1), a grouting machine body (11) being mounted on the base (1), a grouting pipe (111) being connected and mounted on the grouting machine body (11), a quick connector (112) being mounted on the grouting pipe (111), and a pressure gauge (113) being connected to the grouting machine body (11), characterized in that: Also includes: A sealing tube (2), wherein the two ends of the sealing tube (2) are respectively sleeved with an inner bag (21) and an outer bag (22), a first through pipe (23) is installed between the inner bag (21) and the outer bag (22), a bursting valve (24) is provided on the first through pipe (23), a slurry inlet pipe (25) is connected to the outer bag (22), and one end of the slurry inlet pipe (25) away from the outer bag (22) is butt-jointed with a quick connector (112), and a return water pipe (26) is installed on the sealing tube (2); A high-pressure air pump (3), the high-pressure air pump (3) being mounted on a base (1), the high-pressure air pump (3) being connected to a first hose (31), a side of the first hose (31) away from the high-pressure air pump (3) being sleeved with a fixing frame (32), one end of the first hose (31) being provided with a sealing joint (33), the sealing joint (33) being butt-jointed with a side of the sealing tube (2) close to the outer bag (22), and the quick joint (112) being detachably fixed to the fixing frame (32); A support mechanism (4), the support mechanism (4) being installed in the sealing tube (2) and being located at one end close to the inner bag (21), the support mechanism (4) using wind force generated by the high-pressure air pump (3) as a power source to centrally fix one end of the sealing tube (2) located at the inner bag (21) in a sealing hole pre-drilled in the rock formation; An auxiliary mechanism (5), the auxiliary mechanism (5) being installed in the sealing tube (2) and being located at one end close to the outer bag (22); after the sealing tube (2) is inserted into the sealing hole pre-drilled in the rock formation, the auxiliary mechanism (5) assists construction personnel in fixing the end of the sealing tube (2) located at the outer bag (22) in the center of the sealing hole pre-drilled in the rock formation; A switching mechanism (6), wherein the switching mechanism (6) is mounted on the sealing tube (2) and connected to the supporting mechanism (4); after the supporting mechanism (4) fixes one end of the sealing tube (2) located in the inner bag (21) in the center of a sealing hole pre-drilled in the rock formation, the air pressure of the high-pressure air pump (3) drives the supporting mechanism (4) to stop expanding the support, and drives the air pressure through the switching mechanism (6) to clean the inside of the sealing hole; A monitoring mechanism (8), the monitoring mechanism (8) being mounted on a fixing frame (32) and connected to a return water pipe (26) and a pressure gauge (113), the monitoring mechanism (8) monitoring the water flow in the return water pipe (26) and the change of the pressure gauge (113), and stopping the working state of the grouting machine body (11) after reaching the change value when the plugging hole is filled.

2. A tunnel rock grouting plugging device for preventing gas outburst according to claim 1, characterized in that: The support mechanism (4) comprises a support frame (41) fixed in the sealing tube (2), the support frame (41) comprising three parts: a first inner ring (42), a first outer ring (43) and a support rod (44) connecting the first inner ring (42) and the first outer ring (43). A Tang bolt (45) is installed through the center of the support frame (41), a nut (46) is sleeved on the Tang bolt (45), there are two nuts (46), and the internal threads are in opposite directions. A fixing seat (47) is installed on the outer wall of the two nuts (46), and each nut (46) is provided with no less than three fixing seats (47) which are evenly distributed in a ring shape. The fixing seats (47) are installed on the rotating shaft. A first rotating rod (48) is provided, and the first rotating rods (48) located on different nuts (46) correspond to each other one by one, and the ends away from the corresponding fixing seats (47) are also connected by a rotating shaft. The nuts (46) are all provided with sliding grooves (49), and there are a plurality of sliding grooves (49). A limiting rod (410) is installed on the support rod (44), and the limiting rod (410) is located inside the sliding groove (49). It also includes a connecting piece (411) installed in the sealing tube (2). The connecting piece (411) uses the wind force generated by the high-pressure air pump (3) as a power source to drive the two nuts (46) to approach each other, thereby driving the first rotating rods (48) located on different nuts (46) to be in close contact with the inner wall of the sealing hole.

3. The tunnel rock grouting and plugging device for preventing gas outburst according to claim 2 is characterized in that: The linkage (411) comprises a screw rod (4111) mounted on a Tang bolt (45), a second inner ring (4112) being sleeved on the screw rod (4111), a screw groove (4113) being formed on the inner wall of the second inner ring (4112) and being matched with the screw rod (4111), a guide rod (4114) being mounted on the inner wall of the sealing tube (2) in a relative manner, a second outer ring (4115) being slidably connected to the guide rod (4114), and a fragile plate (4116) and a connecting plate (4117) being connected between the second inner ring (4112) and the second outer ring (4115).

4. The tunnel rock grouting plugging device for preventing gas outburst according to claim 3 is characterized in that: The auxiliary mechanism (5) comprises a collar (51) sleeved on the sealing tube (2), the collar (51) being provided with a groove (52), the grooves (52) being provided with a plurality of grooves (52) in a ring array, the second rotating rods (53) being installed in the grooves (52) via rotating shafts, the second rotating rods (53) being sleeved with a torsion spring (54), one end of the torsion spring (54) being fixed to the second rotating rod (53), and the other end of the torsion spring (54) being fixed to the groove (52).

5. The tunnel rock grouting plugging device for preventing gas outburst according to claim 4 is characterized in that: The switching mechanism (6) comprises a frangible point (61) provided on a frangible plate (4116); an air pipe (62) is installed on the frangible plate (4116); the air pipe (62) is coaxially arranged with the frangible point (61); an air ring (63) is connected and installed on the air pipe (62); the air ring (63) is coaxially arranged with the screw rod (4111); a piston cylinder (64) is relatively connected to the bottom surface of the air ring (63); a piston block (65) is arranged in the piston cylinder (64); a screen (67) is fixed below the piston block (65) via a connecting rod (66); the screen (67) is penetrated by the air pipe (62), and the two are slidably connected; a hollow needle tube (68) is arranged on the sieve hole of the screen (67); a sharp end of the hollow needle tube (68) is arranged opposite to the frangible plate (4116).

6. The tunnel rock grouting plugging device for preventing gas outburst according to claim 5, characterized in that: A drainage cover (7) is installed at the top end of the limiting rod (410), and the drainage cover (7) is in the shape of a cover.

7. A tunnel rock grouting plugging device for preventing gas outburst according to claim 6, characterized in that: The monitoring mechanism (8) comprises a docking seat (81) which is installed through the fixing frame (32). The docking seat (81) is cylindrical and connected to one end of the return pipe (26) away from the sealing pipe (2). A positive pole (82) and a negative pole (83) are arranged in the docking seat (81). The positive pole (82) and the negative pole (83) are coaxially arranged, one is long and the other is short. A single positive pole (82) and a single negative pole (83) form a group of induction elements (823). There are multiple groups of induction elements (823) which are distributed in an upper and lower manner. The gaps between the positive poles (82) and the negative poles (83) between the single groups are distributed in a spiral manner. One end of the docking seat (81) away from the return pipe (26) is connected to a drainage pipe (84). The monitoring mechanism (8) also comprises an angle sensor (85) arranged on the pointer of the pressure gauge (113).

8. The tunnel rock grouting plugging device for preventing gas outburst according to claim 7, characterized in that: The injection slurry inside the grouting machine body (11) is added with an airtight agent.

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