Construction method for preventing secondary gas outburst of long and large gas tunnel

Abstract

The application discloses a construction method for preventing secondary gas outburst of a long and large gas tunnel, which comprises a base body, a transmission wheel, a track, a cab, a fixing block and a motor. The transmission wheel is arranged on the inner side of the base body and is nested with the track on the outer side. The cab is fixedly arranged on the upper end of the base body, and the fixing block is also fixedly arranged on the upper end of the base body. The motor is fixedly arranged on the upper end of the fixing block, and the output end of the motor is fixedly connected with a connecting rod. The construction method drives a threaded rod to drill a hole in the unexcavated tunnel through the operation of the motor. When the drill bit is deepened to a certain depth, the motor is reversely operated, so that the threaded rod rotates and moves outward. When the threaded rod moves outward, the sampling grooves equidistantly distributed at the tail end of the connecting rod take out the soil at the deep part of the hole outside the tunnel through the trapezoidal shape of the sampling grooves, and the construction workers can judge the matrix distribution at the deep part of the tunnel by observing the taken samples.

Description

Technical Field

[0001] This invention relates to the field of gas outburst technology, specifically a construction method for preventing secondary gas outbursts in long gas tunnels. Background Technology

[0002] With my country's rapid development and large-scale population movement, the existing transportation routes can no longer meet the current needs, and there is an urgent need to build a convenient transportation network. The most commonly used transportation is the highway. When building highways, it is often necessary to dig through mountains that are difficult to excavate. In order to open up the route, it is necessary to dig tunnels. Tunnels may contain a large amount of methane gas, so it is necessary to prevent methane outbursts when digging tunnels.

[0003] A protective wall for preventing coal and gas outbursts, application number CN202010925427.8, includes a first concrete layer, vertical reinforcing bars, a second concrete layer, and a mine body. Vertical reinforcing bars are cast and fixed inside the first concrete layer, with first and second reinforcing ribs fixed to both sides of the vertical reinforcing bars with screws. The second reinforcing rib is also fixed to the right side of the first reinforcing rib with screws. The second concrete layer is cast and installed on the left side of the first concrete layer, and a protective frame is cast and fixed inside the second concrete layer. A vertical pipe is screwed inside the protective frame. A drainage pipe is fixed through the vertical reinforcing bars, and the left end of the drainage pipe is connected to the vertical pipe via a two-way pipe. This protective wall for preventing coal and gas outbursts, with its vertical reinforcing bars, facilitates the interaction between the vertical reinforcing bars, the first reinforcing ribs, and the second reinforcing ribs, improving the overall strength and impact resistance of the protective wall.

[0004] This comparative device achieves the effect of preventing gas outbursts by enhancing the overall robustness and impact resistance of the protective wall. However, the protective wall can only block gas outbursts and cannot fundamentally eliminate the gas. After long-term use or as the amount of gas accumulated increases, the gas may break through the wall, causing a gas outburst.

[0005] A method for preventing gas outbursts, application number CN201210132669.7, includes: drilling detection holes on the coal face of a roadway; obtaining a first pressure value on the coal face and a second pressure value at the bottom of the detection hole; if the result of subtracting the second pressure value from the first pressure value is greater than a predetermined threshold, the detection hole is considered a hazardous area containing a gas bladder; drilling into the gas bladder in the hazardous area using a spiral drill rod; stopping the feed of the spiral drill rod and fixing its position after drilling into the gas bladder to a predetermined depth; and using the rotation of the spiral drill rod to transfer the gas and coal dust in the gas bladder to a coal-gas separator; the coal-gas separator discharging the coal dust through a coal dust discharge pipe, and discharging the gas into a dedicated extraction pipeline or return airway through a gas discharge pipe. This invention can simply, accurately, reliably, and efficiently detect and eliminate the physical explosion hazard of gas bladders in coal seams, avoiding the harm to miners' lives and property caused by gas outbursts.

[0006] The comparison device is equipped with a structure to detect the gas content of coal seams. Borehole extraction is the most important means of gas extraction and outburst prevention. However, when extracting gas after detection, gas leakage is likely to occur. Gas leakage into the tunnel can cause harm to construction workers, thus posing a certain degree of danger to the construction operation.

[0007] Therefore, we propose a construction method to prevent secondary gas outbursts in long gas tunnels in order to solve the problems mentioned above. Summary of the Invention

[0008] The purpose of this invention is to provide a construction method for preventing secondary gas outbursts in long gas tunnels, thereby solving the problems of poor gas detection and emission performance and lack of protection for construction workers in the comparative device mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a construction method for preventing secondary gas outbursts in long gas tunnels, comprising a base, a drive wheel, a track, a cab, a fixing block, and a motor. The drive wheel is installed inside the base, and the track is nested outside the drive wheel. The cab is fixedly installed at the upper end of the base, and the fixing block is fixedly installed at the upper end of the base. The motor is fixedly installed at the upper end of the fixing block, and a connecting rod is fixedly connected to the output end of the motor. A sampling groove is opened on the outer side of the connecting rod, and a threaded rod is fixedly connected to the tail end of the connecting rod.

[0010] Preferably, the track forms a rotating structure with the base through a transmission wheel, and the track has a trapezoidal shape when viewed from the front; the track moves forward through the rotation of the transmission wheel.

[0011] Preferably, the sampling slots are arranged in four groups around the center of the connecting rod, and the sampling slots have a trapezoidal shape when viewed from the front; the sampling slots can bring out soil from the depth of the tunnel for analysis and research.

[0012] Preferably, the threaded rod and the base form a rotating structure, and the threaded rod and the air extraction pipe are distributed in a front-to-back correspondence about the upper end of the base; the threaded rod can make it easier to rotate the tunnel.

[0013] Preferably, a gas storage chamber is fixedly installed on the upper end of the substrate, and an air pump is fixedly installed inside the gas storage chamber. An air extraction pipe is fixedly connected to the outside of the air pump and passes through the inside of the gas storage chamber. A vent hole is opened on the inside of the air extraction pipe, and an air bag is fixedly installed on the outside of the air extraction pipe. A threaded groove is opened on the inside of the air extraction pipe, and a first sealing block is fixedly installed on the inside of the threaded groove. A threaded block is connected to the inside of the threaded groove, and a second sealing block is fixedly installed on the outside of the threaded block. The threaded block is fixedly installed on the outside of the first connecting pipe. A second connecting pipe is connected to the tail end of the first connecting pipe, and a probe is fixedly installed on the tail end of the second connecting pipe. A filter screen is fixedly installed inside the probe. A gas concentration detector is fixedly installed on the upper end of the substrate, a control module is fixedly installed on the upper end of the substrate, and a buzzer alarm is fixedly installed on the upper end of the substrate.

[0014] Preferably, the vent holes are arranged in four groups around the center of the extraction pipe, and the diameter of the extraction pipe is smaller than that of the threaded rod; the vent holes allow gas to enter the inside of the airbag.

[0015] Preferably, the suction pipe and the second connecting pipe are connected to the left and right ends of the first connecting pipe, and the first connecting pipe is provided with multiple sets about the tail end of the suction pipe; the overall length of the first connecting pipe can be increased by connecting multiple sets.

[0016] Preferably, the extraction pipe is threadedly connected to the threaded block fixedly installed on the side end of the first connecting pipe through a threaded groove on its inner side, and the first sealing block installed on the inner side of the threaded groove and the second sealing block fixedly installed on the outer side of the threaded block are distributed in a left-right correspondence; setting the first sealing block and the second sealing block can increase the sealing performance of the connection.

[0017] A preferred method for using a construction method to prevent secondary gas outbursts in long gas tunnels includes the following steps:

[0018] S1: When the construction workers enter the cab and operate the vehicle, the drive wheels rotate, which in turn drives the tracks forward, compressing the road surface at the lower end of the tunnel to make it flat and firm, preventing gas from leaking from the ground. After moving a certain distance, the motor is started. The motor drives the threaded rod to rotate through the output end, drilling a hole inside the tunnel. After reaching a certain depth, the motor is reversed, and the output end of the motor drives the threaded rod to rotate in the opposite direction. The threaded rod moves outward from the tunnel. As it moves outward, the sampling groove opened on the outside of the connecting rod uses its trapezoidal structure to fill the soil at the depth of the hole into the inner side of the sampling groove, which is then brought out with the sampling groove. By observing the soil composition at the depth of the hole, the construction workers can roughly judge the matrix distribution and gas content inside the tunnel.

[0019] S2: After the borehole is completed, disassemble the connecting rod and threaded rod, place the second connecting pipe inside the borehole, and connect the first and second connecting pipes through threaded connection. Place the first and second sealing blocks at the connection point to prevent gas leakage. Continue connecting the first connecting pipes sequentially, and push the second connecting pipe to the depth of the borehole. When the probe at the end of the second connecting pipe enters the innermost part of the borehole, connect the end of the first connecting pipe to the end of the extraction pipe. Place the end of the extraction pipe inside the borehole and run the air pump. The air pump, through suction, draws out the gas from inside the tunnel. The filter screen installed inside the probe is sucked out. The filter screen can filter out impurities such as soil inside the tunnel, preventing soil from clogging the inside of the first connecting pipe 18. When the gas moves to the inside of the extraction pipe, part of the gas inside enters the inside of the airbag through the vent. After the airbag is filled, it will inflate and fit against the inside of the tunnel, thereby preventing the gas from leaking from the gap between the tunnel and the extraction pipe. The sucked-out gas is collected by the gas storage chamber and decomposed or transferred for discharge, preventing the accumulation of gas during tunnel construction, which could lead to explosions or gas poisoning.

[0020] S3: Methane is a colorless and odorless gas. A methane concentration detector is installed inside the construction vehicle. When the methane concentration in the tunnel is too high, the methane concentration detector transmits the detected information to the control module. The control module then controls the buzzer alarm to sound, prompting construction personnel to put on protective masks and evacuate to avoid methane poisoning.

[0021] Compared with the prior art, the beneficial effects of the present invention are: the construction method for preventing secondary gas outbursts in long gas tunnels:

[0022] 1. Equipped with a sampling probe, the motor drives a threaded rod to drill through the unexcavated tunnel. When the drill bit reaches a certain depth, the motor reverses, causing the threaded rod to rotate and move outward. As it moves outward, the sampling slots at equal intervals at the end of the connecting rod, through their own inclined trapezoidal shape, bring the soil from deep within the drilled hole out of the tunnel. Construction workers can then determine the distribution of the matrix deep within the tunnel by observing the extracted samples.

[0023] 2. A well-sealed exhaust structure is installed. By inserting the second connecting pipe into the drilled hole, and then splicing multiple sections of the first connecting pipe to the beginning of the second connecting pipe, the overall length of the connecting pipe is increased. Sealing blocks are installed at the splices to increase the sealing performance. After the required length is reached, the beginning of the first connecting pipe is connected to the end of the extraction pipe. The extraction pipe is placed at the tunnel entrance, and the air pump is run. The air pump operates, allowing the gas in the hole to enter the gas storage chamber from the probe. When the gas moves to the inside of the extraction pipe, it enters the inside of the airbag through the vent, lifting the airbag so that the outside of the airbag is completely in contact with the tunnel entrance, preventing the gas from being discharged to the outside of the tunnel through the gap between the hole and the extraction pipe.

[0024] 3. An alarm device is installed. Because methane is a colorless and odorless gas, it needs to be detected by a methane concentration detector. When the methane concentration outside the tunnel reaches a certain level, the methane concentration detector will transmit a signal to the control module. The control module will then activate the buzzer alarm, which will sound to remind construction personnel to wear protective masks or evacuate, thus protecting the construction personnel. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the front sectional view of the present invention;

[0026] Figure 2 This is a top view of the structure of the present invention;

[0027] Figure 3 This is a front view schematic diagram of the sampling groove structure of the present invention;

[0028] Figure 4 This is a side view of the sampling groove structure of the present invention;

[0029] Figure 5 This is a schematic diagram of the front sectional view of the first connecting rod of the present invention;

[0030] Figure 6 This is a schematic diagram of the side cross-sectional structure of the airbag of the present invention;

[0031] Figure 7 This is a schematic diagram of the front sectional view of the extraction pipe of the present invention;

[0032] Figure 8This is a schematic diagram of the side view structure of the probe of the present invention.

[0033] In the diagram: 1. Base; 2. Drive wheel; 3. Track; 4. Cab; 5. Fixing block; 6. Motor; 7. Connecting rod; 8. Sampling slot; 9. Threaded rod; 10. Gas storage chamber; 11. Air pump; 12. Suction pipe; 13. Vent hole; 14. Airbag; 15. First sealing block; 16. Threaded block; 17. Second sealing block; 18. First connecting pipe; 19. Second connecting pipe; 20. Probe; 21. Filter screen; 22. Gas concentration detector; 23. Control module; 24. Buzzer alarm; 25. Threaded groove. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Please see Figure 1-8 This invention provides a technical solution: a construction method for preventing secondary gas outbursts in long gas tunnels, comprising a base 1, a transmission wheel 2, a track 3, a cab 4, a fixing block 5, a motor 6, a connecting rod 7, a sampling groove 8, a threaded rod 9, a gas storage chamber 10, an air pump 11, an extraction pipe 12, a vent 13, an airbag 14, a first sealing block 15, a threaded block 16, a second sealing block 17, a first connecting pipe 18, a second connecting pipe 19, a probe 20, a filter screen 21, a gas concentration detector 22, a control module 23, a buzzer alarm 24, and a threaded groove 25.

[0036] A drive wheel 2 is installed inside the base 1, and a track 3 is nested outside the drive wheel 2. A cab 4 is fixedly installed on the upper end of the base 1, and a fixing block 5 is fixedly installed on the upper end of the base 1. A motor 6 is fixedly installed on the upper end of the fixing block 5, and a connecting rod 7 is fixedly connected to the output end of the motor 6. A sampling groove 8 is opened on the outer side of the connecting rod 7, and a threaded rod 9 is fixedly connected to the tail end of the connecting rod 7.

[0037] according to Figure 1-4 As shown, the track 3 forms a rotating structure with the base 1 through the transmission wheel 2, and the track 3 has a trapezoidal shape when viewed from the front; there are four sets of sampling slots 8 distributed in a circle about the center of the connecting rod 7, and the sampling slots 8 have a slanted trapezoidal shape when viewed from the front; the threaded rod 9 forms a rotating structure with the base 1, and the threaded rod 9 and the air extraction pipe 12 are distributed in a front-to-back correspondence about the upper end of the base 1;

[0038] When construction workers enter the cab and operate the vehicle, the drive wheel 2 rotates, which in turn drives the track 3 forward, compressing the road surface at the lower end of the tunnel to make it flat and firm, preventing gas leakage from ground cracks. After moving a certain distance, the motor 6 is activated. The motor 6 drives the threaded rod 9 to rotate through its output end, drilling a hole inside the tunnel. After rotating to a certain depth, the motor 6 is activated in the opposite direction, and the output end of the motor 6 drives the threaded rod 9 to rotate in the opposite direction, moving the threaded rod 9 outward. As it moves outward, the sampling groove 8 opened on the outside of the connecting rod 7 uses its trapezoidal structure to fill the soil at the depth of the hole into the inner side of the sampling groove 8, which is then brought out with the sampling groove 8. By observing the soil composition at the depth of the hole, construction workers can roughly determine the matrix distribution and gas content inside the tunnel.

[0039] A gas storage chamber 10 is fixedly installed on the upper end of the base 1, and an air pump 11 is fixedly installed inside the gas storage chamber 10. An air extraction pipe 12 is fixedly connected to the outside of the air pump 11 and penetrates the inside of the gas storage chamber 10. A vent hole 13 is opened on the inside of the air extraction pipe 12, and an air bag 14 is fixedly installed on the outside of the air extraction pipe 12. A threaded groove 25 is opened on the inside of the air extraction pipe 12, and a first sealing block 15 is fixedly installed on the inside of the threaded groove 25. A threaded block 16 is connected to the inside of the threaded groove 25. A second sealing block 17 is fixedly installed on the outside of block 16, and threaded block 16 is fixedly installed on the outside of first connecting pipe 18. The tail end of first connecting pipe 18 is connected to second connecting pipe 19, and a probe 20 is fixedly installed on the tail end of second connecting pipe 19. A filter screen 21 is fixedly installed on the inside of probe 20. A gas concentration detector 22 is fixedly installed on the upper end of base 1, and a control module 23 is fixedly installed on the upper end of base 1. A buzzer alarm 24 is fixedly installed on the upper end of base 1.

[0040] according to Figure 1-2 , Figure 5-8 As shown, there are four sets of vent holes 13 distributed circumferentially about the center of the suction pipe 12, and the diameter of the suction pipe 12 is smaller than that of the threaded rod 9; the suction pipe 12 and the second connecting pipe 19 are connected to the left and right ends of the first connecting pipe 18, and the first connecting pipe 18 has multiple sets of holes about the tail end of the suction pipe 12; the suction pipe 12 is connected to the threaded block 16 fixedly installed on the side end of the first connecting pipe 18 through the threaded groove 25 opened on the inner side, and the first sealing block 15 installed on the inner side of the threaded groove 25 and the second sealing block 17 fixedly installed on the outer side of the threaded block 16 are distributed in a left-right correspondence.

[0041] After the borehole is completed, the connecting rod 7 and threaded rod 9 are disassembled. The second connecting pipe 19 is placed inside the borehole and connected by threads to the first connecting pipe 18 and the second connecting pipe 19. A first sealing block 15 and a second sealing block 17 are placed at the connection to prevent gas leakage. The first connecting pipe 18 is connected sequentially, and the second connecting pipe 19 is pushed to the depth of the borehole. When the probe 20 at the end of the second connecting pipe 19 enters the innermost part of the borehole, the end of the first connecting pipe 18 is connected to the end of the suction pipe 12. The end of the suction pipe 12 is placed inside the borehole, and the air pump 11 is run. The air pump 11 uses suction to draw out the gas inside the tunnel from the filter screen 21 installed inside the probe 20. The filter screen 21 can filter out impurities such as soil inside the borehole to prevent soil from clogging the inside of the first connecting pipe 18. When the gas moves to the inside of the extraction pipe 12, part of the gas inside enters the inside of the airbag 14 through the vent 13. After the airbag 14 is filled, it will inflate and fit against the inside of the tunnel, thus preventing the gas from leaking from the gap between the tunnel and the extraction pipe 12. The extracted gas is collected by the gas storage chamber 10 and decomposed or transferred for discharge, preventing the accumulation of gas during tunnel construction, which could lead to explosions or gas poisoning. Since gas is colorless and odorless, a gas concentration detector 22 is installed inside the construction vehicle. When the gas content in the tunnel is too high, the gas concentration detector 22 transmits the detected information to the control module 23. The control module 23 controls the buzzer alarm 24 to sound, prompting construction personnel to put on protective masks and evacuate to avoid gas poisoning.

[0042] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0044] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A structure for preventing secondary gas outbursts in long gas tunnels, comprising a base (1), a drive wheel (2), a track (3), a driver's cab (4), a fixing block (5), and a motor (6), characterized in that, A drive wheel (2) is installed inside the base (1), and a track (3) is nested outside the drive wheel (2). A cab (4) is fixedly installed on the upper end of the base (1), and a fixing block (5) is fixedly installed on the upper end of the base (1). A motor (6) is fixedly installed on the upper end of the fixing block (5), and a connecting rod (7) is fixedly connected to the output end of the motor (6). A sampling groove (8) is opened on the outer side of the connecting rod (7), and a threaded rod (9) is fixedly connected to the tail end of the connecting rod (7). An air storage chamber (10) is fixedly installed on the upper end of the base (1), and an air pump (11) is fixedly installed inside the air storage chamber (10). An air extraction pipe (12) is fixedly connected to the outer side of the air pump (11), and the air extraction pipe (12) penetrates the inner side of the air storage chamber (10). A vent hole (13) is opened on the inner side of the air extraction pipe (12). An airbag (14) is fixedly installed on the outside. A threaded groove (25) is opened on the inside of the air extraction pipe (12). A first sealing block (15) is fixedly installed on the inside of the threaded groove (25). A threaded block (16) is connected to the inside of the threaded groove (25). A second sealing block (17) is fixedly installed on the outside of the threaded block (16). The threaded block (16) is fixedly installed on the outside of the first connecting pipe (18). A second connecting pipe (19) is connected to the tail end of the first connecting pipe (18). A probe (20) is fixedly installed on the tail end of the second connecting pipe (19). A filter screen (21) is fixedly installed on the inside of the probe (20). A gas concentration detector (22) is fixedly installed on the upper end of the substrate (1). A control module (23) is fixedly installed on the upper end of the substrate (1). A buzzer alarm (24) is fixedly installed on the upper end of the substrate (1).

2. The structure for preventing secondary gas outbursts in long gas tunnels according to claim 1, characterized in that: The track (3) forms a rotating structure with the base (1) through the transmission wheel (2), and the track (3) has a trapezoidal shape when viewed from the front.

3. The structure for preventing secondary gas outbursts in long gas tunnels according to claim 1, characterized in that: The sampling slots (8) are distributed in four groups around the center of the connecting rod (7), and the sampling slots (8) have a trapezoidal shape when viewed from the front.

4. The structure for preventing secondary gas outbursts in long gas tunnels according to claim 1, characterized in that: The threaded rod (9) and the base (1) form a rotating structure, and the threaded rod (9) and the air extraction pipe (12) are distributed in a front-to-back correspondence about the upper end of the base (1).

5. The structure for preventing secondary gas outbursts in long gas tunnels according to claim 1, characterized in that: The ventilation holes (13) are distributed in four groups around the center of the suction pipe (12), and the diameter of the suction pipe (12) is smaller than that of the threaded rod (9).

6. The structure for preventing secondary gas outbursts in long gas tunnels according to claim 1, characterized in that: The extraction pipe (12) and the second connecting pipe (19) are connected to the left and right ends of the first connecting pipe (18), and the first connecting pipe (18) has multiple sets of connections about the tail end of the extraction pipe (12).

7. The structure for preventing secondary gas outbursts in long gas tunnels according to claim 1, characterized in that: The air extraction pipe (12) is connected to the threaded block (16) fixedly installed on the side end of the first connecting pipe (18) through the threaded groove (25) opened on the inner side. The first sealing block (15) installed on the inner side of the threaded groove (25) and the second sealing block (17) fixedly installed on the outer side of the threaded block (16) are distributed in a left-right correspondence.

8. A construction method employing the structure for preventing secondary gas outbursts in long gas tunnels as described in claim 1, characterized in that: Includes the following steps: S1: When the construction personnel enter the cab and run the vehicle, the transmission wheel (2) will rotate. The rotation of the transmission wheel (2) will drive the track (3) to move forward and squeeze the road surface at the bottom of the tunnel to make the road surface flat and firm, and prevent gas from leaking from the ground gaps. After moving to a certain distance, the motor (6) will run. After the motor (6) runs, the output end will drive the threaded rod (9) to rotate and drill the hole inside the tunnel. After rotating to a certain depth, the motor (6) will run in the opposite direction. The output end of the motor (6) will drive the threaded rod (9) to rotate in the opposite direction and move the threaded rod (9) to the outside of the tunnel. When moving outward, the sampling groove (8) opened on the outside of the connecting rod (7) will fill the soil at the depth of the hole into the inside of the sampling groove (8) through its own trapezoidal structure and be brought out with the sampling groove (8). The construction personnel can judge the matrix distribution and gas content inside the tunnel by observing the soil composition at the depth of the hole. S2: After the drilling is completed, disassemble the connecting rod (7) and the threaded rod (9), place the second connecting pipe (19) inside the drilling hole, and connect the first connecting pipe (18) and the second connecting pipe (19) through threaded connection. Place the first sealing block (15) and the second sealing block (17) at the connection to prevent gas leakage at the connection. Connect the first connecting pipe (18) backward in sequence, push the second connecting pipe (19) to the depth of the drilling hole, and when the probe (20) at the end of the second connecting pipe (19) enters the innermost part of the drilling hole, connect the end of the first connecting pipe (18) to the end of the suction pipe (12), place the end of the suction pipe (12) inside the drilling hole, and run the air pump (11). The air pump (11) runs through The suction force draws out the gas inside the tunnel through the filter screen (21) installed inside the probe (20). The filter screen (21) can filter the soil inside the tunnel to prevent the soil from clogging the inside of the first connecting pipe (18). When the gas moves to the inside of the extraction pipe (12), part of the gas inside enters the inside of the airbag (14) through the vent (13). After the airbag (14) is filled, it will bulge and fit against the inside of the tunnel, thereby preventing the gas from leaking from the gap between the tunnel and the extraction pipe (12). The gas that is drawn out is collected by the gas storage chamber (10) and decomposed or transferred for discharge to prevent the gas from accumulating in large quantities during tunnel construction, which could lead to explosion or gas poisoning. S3: Methane is a colorless and odorless gas. A methane concentration detector (22) is installed inside the construction vehicle. When the methane content in the tunnel is too high, the methane concentration detector (22) transmits the detected information to the control module (23). The control module (23) controls the operation of the buzzer alarm (24) to emit a buzzer sound to remind the construction personnel to wear protective masks and evacuate to avoid methane poisoning.

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