In-situ hardening device and method for coal mine roadway slime water

Abstract

The invention relates to the field of coal mine tunnel supporting, in particular to a coal mine tunnel slime water in-situ hardening device and method. The device comprises a slime water self-suction device, a stirring mechanism, a paving device, a walking mechanism and a feeding device, wherein the slime water self-suction device is used for sucking slime water on a bottom plate of an excavation roadway, the stirring mechanism is used for mixing and stirring the slime water and other materials into an in-situ hardening material, the paving device is used for paving the in-situ hardening material, and the walking mechanism is used for bearing the in-situ hardening device and can drive the in-situ hardening device to move. The feeding device is used for supplying in-situ hardening raw materials; the method comprises the steps that the inclination condition of a vehicle body is obtained in real time through cooperation of a laser transmitter, target paper and a camera, and leveling is conducted by adjusting the height of a leveling roller. According to the invention, the integration of extraction, stirring and paving can be realized, the problems of difficulty in pedestrians and driving and the like caused by excessive accumulation of coal slime on a bottom plate of a tunneling roadway are solved, the labor intensity of workers is reduced, and the tunneling efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of coal mine tunnel support, and in particular to a device and method for in-situ hardening of coal slurry water in a coal mine tunnel. Background Art

[0002] When tunneling in coal seams, a large amount of coal dust is likely to accumulate in the tunnel. If the water content of the coal seam roof is high and the floor is mudstone, the cut coal and coal dust are mixed with the roof water and the floor mudstone to form a "coal-mud-water" mixture (hereinafter referred to as "coal mud water"). During the tunneling process, the coal mud water in the tunnel needs to be dredged. Under normal pressure, the coal mud has high viscosity, low strength, and a certain degree of fluidity, which greatly interferes with the operation of pedestrians on the working face and the tunneling equipment, resulting in a decrease in the efficiency of tunneling. At present, the cleaning of coal mud water mainly relies on manpower, which increases the construction process and the labor intensity of workers, and reduces the tunneling efficiency. Summary of the invention

[0003] In view of the deficiencies in the above-mentioned prior art, the present invention proposes a device for hardening coal slurry in a coal mine tunnel, comprising a coal slurry self-priming device, a stirring mechanism, a paving device, and a walking mechanism;

[0004] The walking mechanism comprises a vehicle body, and the vehicle body comprises at least a rectangular bearing plate structure; a rectangular mixed material discharge port is arranged in the middle of the vehicle body along the width direction of the vehicle body;

[0005] The coal slurry water self-priming device is arranged at the front of the vehicle body, including a suction head, which is arranged in a rectangular flat-mouth structure, and the width is the same as the width of the vehicle body; it also includes a self-priming device main unit, which is fixed at the front of the vehicle body; the inlet of the self-priming device main unit is connected to the suction head through a first pipeline, and the outlet of the self-priming device main unit is connected to the coal slurry water tank through a first pipeline, and a coal slurry water flow meter is arranged on the first pipeline; the coal slurry water tank is provided with a concentration meter; the coal slurry water tank is also provided with a feeding port;

[0006] The stirring mechanism is arranged in the middle of the vehicle body, located above the discharge port of the mixed material, and comprises a stirring barrel, on which a stirring frame is arranged; the stirring barrel is respectively connected with the slag feed port, the geopolymer feed port, the activator feed port and the coal slime water tank discharge port through a second pipeline; the stirring barrel is also provided with a mixed discharge port, which is connected with the mixture discharge port and is used for discharging materials along the width direction of the entire vehicle body;

[0007] The paving device is arranged at the rear part of the vehicle body, two ear plates are arranged at the rear part of the vehicle body, a paving roller is arranged between the two ear plates, the paving roller is rotatably connected with the two ear plates, the ear plates are provided with vertical guide rails, and the ends of the paving roller can move up and down in the guide rails to adjust its position in the guide rails; a laser emitter is respectively arranged on the two ear plates, and a target paper is also arranged at the rear of the vehicle body. The target paper is provided with a horizontal line as a horizontal reference, and the horizontal line always remains horizontal; a camera is also arranged at the rear of the vehicle body, and the camera is used to collect the positions of the left laser point and the right laser point of the laser emitter on the target paper to obtain the inclination of both sides of the vehicle body.

[0008] Preferably, the vehicle body is provided with wheels, and the wheels are driven by a fourth electric motor; the width of the vehicle body is slightly larger than half of the width of the lane or slightly larger than one third of the width of the lane.

[0009] Preferably, an adjustment mechanism is provided at each end of the suction head, one end of the adjustment mechanism is connected to the suction head, and the other end is connected to the vehicle body, the adjustment mechanism can adjust the height of the suction head, and the main body of the self-priming device is driven by the first motor.

[0010] Preferably, the stirring frame is driven by a second motor to stir and mix the materials in the stirring barrel.

[0011] Preferably, it also includes the feeding device, and four of the feeding devices are provided, which are used to provide coal slime, slag, geopolymer and activator respectively.

[0012] Preferably, the feeding device includes a silo, a valve is provided at the outlet of the silo, and then connected to the upper side of the wall of the third pipeline, one end of the third pipeline is connected to the fan and the other end is a discharge port, and a second flow meter is provided at the end of the third pipeline close to the discharge port.

[0013] Preferably, it also includes a water pump, which is configured to supply water to the coal slime water tank or to the mixing barrel.

[0014] Preferably, the paving roller is driven to rotate by a third motor, and an auxiliary baffle is respectively provided at the ear plates on both sides of the vehicle body, and the height and pitch angle of the auxiliary baffle relative to the vehicle body can be adjusted by a second adjusting component.

[0015] Preferably, it also includes a control device, which is used to control the operation of each component.

[0016] The present invention also proposes a method for in-situ hardening of coal slurry water in a coal mine tunnel, which uses the in-situ hardening device for coal slurry water in a coal mine tunnel as described above, and comprises the following steps:

[0017] S1: Divide the excavation tunnel into two or three parts along the width direction, and the width of each part matches the width of the frame;

[0018] S2: Set the in-situ hardening device in a flat position, adjust the suction head to a suitable position, and adjust the position of the flattening roller to determine a suitable laying height; set the target paper to a suitable height so that the left laser point and the right laser point emitted by the laser transmitter are on the horizontal line; and then always keep the height position of the target paper unchanged;

[0019] S3: Determine the appropriate ratio of coal slime, slag, geopolymer, activator and water;

[0020] S4: Control the coal slurry water in-situ hardening device to move forward, and the suction head sucks the coal slurry water at the bottom thereof into the coal slurry water tank, obtains the ratio of coal slurry to water in the sucked coal slurry water according to the coal slurry water concentration meter, adds coal slurry to the coal slurry water tank, or adds water to the coal slurry water tank or the mixing tank, so that the ratio of coal slurry to water reaches the designed ratio; adds slag, geopolymer, and activator to the mixing tank according to the designed ratio; stirs and mixes evenly using a stirring rack; and discharges the in-situ hardening material to the ground through the mixing discharge port and the mixture discharge port;

[0021] At the same time, the positions of the left and right laser points emitted by the laser transmitter on the target paper are obtained by taking photos with a camera, and the height of the paving roller is adjusted according to the relative positions of the left and right laser points and the horizontal line, so that the left and right laser points emitted by the laser transmitter are always on the horizontal line;

[0022] S5: Install steps S1-S4 one by one for each part;

[0023] S6: As the excavation working face continues to advance, the excavation tunnel installation steps S1-S5 are carried out in the case of newly generated coal slime water bottom plate.

[0024] Beneficial effects of the present invention:

[0025] 1. The device for hardening coal slurry water on the bottom plate of a coal mine tunnel proposed in the present invention can realize the integrated functions of extraction-mixing-leveling, mainly solving the problem of excessive accumulation of coal slurry on the bottom plate of the tunnel, causing difficulties for pedestrians and vehicles, reducing the labor intensity of workers and improving tunneling efficiency.

[0026] 2. The method for in-situ hardening of coal mine tunnel floor slurry water proposed in the present invention can realize rapid in-situ hardening of tunnel floor slurry water. The material used is mainly slurry water, which realizes the use of local materials and turns waste into treasure, greatly reducing the hardening cost.

[0027] 3. The present invention can realize the cleaning of coal sludge water and rapid hardening of the bottom plate at the same time. Compared with conventional concrete hardening, it has the advantages of fast hardening speed and high early strength, which can improve construction efficiency and alleviate transportation tension. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0029] Figure 1 It is a schematic diagram of the overall structure of the in-situ hardening device for coal mine tunnel coal slurry water of the present invention;

[0030] Figure 2 It is a schematic diagram of a paving device for a coal mine tunnel coal slurry water in-situ hardening device of the present invention;

[0031] Figure 3 It is a schematic diagram showing the target paper of the in-situ hardening device for coal slurry water in a coal mine tunnel of the present invention;

[0032] Figure 4 It is a schematic diagram of the overall structure of the feeding device of the present invention;

[0033] The following are the descriptions of the reference numerals:

[0034] 1-coal slurry water self-priming device: 101-suction head, 102-first pipeline, 103-first motor; 104-adjusting mechanism; 105-self-priming device host; 106-coal slurry water flow meter; 107-coal slurry water concentration meter; 108-coal slurry water tank; 109-feeding port;

[0035] 2- stirring mechanism: 201- slag feed port, 202- geopolymer feed port, 203- activator feed port; 204- stirring frame, 205- second motor; 206- second pipeline; 207- stirring barrel;

[0036] 3- paving device: 301- third motor, 302- paving roller; 303- camera; 304- laser transmitter; 305- paving baffle; 306- guide rail; 307- target paper; 308- horizontal line; 309- ear plate; 3041- left laser point; 3042- right laser point;

[0037] 4-travel mechanism: 401-mixture discharge port, 402-fourth motor, 403-wheel, 404-car body;

[0038] 5-feeding device: 501-silo, 502-valve, 503-fan, 504-second flow meter, 505-discharge port; 506-third pipeline; 6-control device. DETAILED DESCRIPTION

[0039] 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.

[0040] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0041] Embodiment 1

[0042] like Figure 1-4 As shown, the coal mine tunnel coal slurry water in-situ hardening device of the present invention comprises a coal slurry water self-priming device 1, a stirring mechanism 2, a paving device 3, a walking mechanism 4 and a feeding device 5; the coal slurry water self-priming device 1 is used to absorb the coal slurry water on the bottom plate of the excavation tunnel, the stirring mechanism 2 is used to mix the coal slurry water and other materials and stir them into in-situ hardening materials, the paving device 3 is used to pave the in-situ hardening materials, the walking mechanism 4 is used to carry the in-situ hardening device and can drive the in-situ hardening device to move, and the feeding device 5 is used to supply the in-situ hardening raw materials;

[0043] The walking mechanism 4 includes a vehicle body 404, the vehicle body 404 includes at least a rectangular bearing plate structure, the vehicle body 404 is provided with wheels 403, and the wheels 403 are driven by a fourth motor 402; a rectangular mixed material discharge port 401 is provided in the middle of the vehicle body 404 along the width direction of the vehicle body; the width of the vehicle body 404 is preferably slightly larger than half of the width of the lane or slightly larger than one third of the width of the lane;

[0044] The coal slurry water self-priming device 1 is arranged at the front of the vehicle body 404, including a suction head 101, the suction head 101 is arranged to be a rectangular flat mouth structure, and the width is the same as the width of the vehicle body 404, and an adjustment mechanism 104 is arranged at each end of the suction head 101, one end of the adjustment mechanism 104 is connected to the suction head 101, and the other end is connected to the vehicle body 404, the adjustment mechanism 104 is preferably a hydraulic or electric telescopic rod, and the adjustment mechanism 104 can adjust the height of the suction head 101; it also includes a self-priming device host 105, the self-priming device host 105 is fixed to the front of the vehicle body 404, and the self-priming The device host 105 is driven to work by the first motor 103; the inlet of the self-priming device host 105 is connected to the suction head 101 through the first pipeline 104, and the outlet of the self-priming device host 105 is connected to the coal slurry water tank 108 through the first pipeline 104, and a coal slurry water flowmeter 106 is arranged on the first pipeline; the coal slurry water tank 108 is used to store coal slurry water, and the coal slurry water tank 108 is provided with a concentration meter 107; the coal slurry water tank 108 is also provided with a feeding port 109, and the feeding port 109 is used to add water or coal slurry to adjust the coal slurry water to a suitable concentration;

[0045] The stirring mechanism 2 is arranged in the middle of the vehicle body 404, located above the mixed material discharge port 401, and the stirring mechanism 2 includes a stirring barrel 207, and a stirring frame 204 is arranged on the stirring barrel 207, and the stirring frame 204 is driven by a second motor 205 to stir and mix the materials in the stirring barrel 207; the stirring barrel 207 is respectively connected to the slag feed port 201, the geopolymer feed port 202, the activator feed port 203 and the discharge port of the coal slime water tank 108 through a second pipeline 206; the stirring barrel 207 is also provided with a mixed discharge port (not shown in the figure), and the mixed discharge port of the stirring barrel 207 is connected to the mixed material discharge port 401, and is used for discharging materials along the width direction of the entire vehicle body 404;

[0046] The feeding device 5 can be provided separately or on the vehicle body 404 as required. Four feeding devices 5 are provided, which are used to provide coal slime, slag, geopolymer and activator respectively. That is, the discharge ports 505 of the four feeding devices 5 are respectively connected with the feeding port 109, the slag feeding port 201, the geopolymer feeding port 202 and the activator feeding port 203; the feeding devices 5 have the same structure, including a silo 501. The silo 501 is preferably a conical barrel structure, with the upper part as the inlet and the lower part as the outlet. A valve 502 is provided at the outlet of the silo 501, which is then connected with the silo. The third pipeline 506 is connected to the upper side of the pipe wall, one end of the third pipeline 506 is connected to the fan 503, the fan 503 is used to increase the power for material flow, the other end of the third pipeline 506 is a discharge port 505, and the end of the third pipeline 506 close to the discharge port 505 is provided with a second flow meter 504; it also includes a water pump (not shown in the figure), the water pump is used to provide water when the coal slime concentration in the coal slime water tank 108 is high, the water pump can be set to supply water to the coal slime water tank 108, and can also be set to supply water to the mixing barrel 207, and preferably supplies water to the mixing barrel 207;

[0047] The paving device 3 is arranged at the rear part of the vehicle body 404, and two ear plates 309 are arranged at the rear part of the vehicle body 404, and a paving roller 302 is arranged between the two ear plates 309, and the paving roller 302 is rotatably connected with the two ear plates, and the paving roller 302 is driven to rotate by the third motor 301, and is used to pave the released in-situ hardening material, and the ear plate 309 is provided with a vertical guide rail 307, and the end of the paving roller 302 can move up and down in the guide rail 307, and the two ends of the paving roller 302 can adjust their positions in the guide rail 307 respectively through a first adjustment component (not shown in the figure) (can be adjusted to different relative positions of the guide rail 307); an auxiliary baffle 305 is also arranged at the ear plates 309 on both sides of the vehicle body 404, and the auxiliary baffle 305 can adjust its height and pitch angle relative to the vehicle body 404 (ear plate 309) through a second adjustment component (not shown in the figure) to block the in-situ hardening material as much as possible to prevent it from overflowing to both sides. The first adjustment component and the second adjustment component are preferably hydraulic or electric telescopic rods, and a suitable number can be set according to needs; a laser emitter 304 is respectively arranged on the two ear plates 309, and a target paper 307 is also arranged behind the vehicle body 404. The target paper 307 is provided with a horizontal line 308 as a horizontal reference, and the horizontal line 308 always remains horizontal; a camera 303 is also arranged at the rear of the vehicle body 404, and the camera is used to collect the positions of the left laser point 3041 and the right laser point 3042 of the laser emitter 304 on the target paper 307, and obtain the inclination of both sides of the vehicle body 404. The left laser point 3041 and the right laser point 3042 are respectively emitted by the two laser emitters 304. According to the relative positions of the left laser point 3041 and the right laser point 3042 and the horizontal line 308, the position of the end of the paving roller 3 on one side or both sides in the guide rail 306 can be adjusted, so that the paved in-situ hardened road surface always maintains the same height;

[0048] It also includes a control device 6, which is used to control the operation of various components.

[0049] Embodiment 2

[0050] like Figure 1-4 As shown, the present invention also proposes a method for hardening coal slurry in a coal mine tunnel, using a device for hardening coal slurry in a coal mine tunnel according to the first embodiment, comprising the following steps:

[0051] S1: Divide the excavation tunnel into two or three parts along the width direction, and the width of each part matches the width of the frame 404;

[0052] S2: The in-situ hardening device is set in a flat position, and the height of the suction head 101 is adjusted by the adjustment mechanism so that the suction head 101 can suck up the coal slurry water below it, and the position of the paving roller 302 is adjusted by the first adjustment component to determine the appropriate paving height; the target paper 307 is set to a suitable height, so that the left laser point 3041 and the right laser point 3042 emitted by the laser emitter 304 are located on the horizontal line 308; then the height position of the target paper 307 is always kept unchanged, so that the height of the top surface of the paved road surface is flat instead of undulating; the height of the paving roller 302 is adjusted by the second adjustment component, and the paving baffle 305 is adjusted so that its bottom is close to the ground;

[0053] S3: Determine the appropriate ratio of coal slime, slag, geopolymer, activator and water;

[0054] S4: Control the coal slurry water in-situ hardening device to move forward, and the suction head 101 sucks the coal slurry water at its lower part into the coal slurry water tank 108, obtain the ratio of coal slurry and water in the sucked coal slurry water according to the coal slurry water concentration meter 106, use the feeding device 5 to add coal slurry to the coal slurry water tank 108, or use the water pump to add water to the coal slurry water tank 108 or the mixing tank 207, so that the ratio of coal slurry and water reaches the designed ratio; add slag, geopolymer, and activator to the mixing tank 207 according to the designed ratio, or add slag, geopolymer, activator and water to the mixing tank 207 according to the designed ratio; use the stirring frame 204 to stir and mix evenly; and discharge the in-situ hardening material to the ground through the mixing discharge port and the mixture discharge port 401;

[0055] At the same time, the camera 303 is used to obtain the positions of the left laser point 3041 and the right laser point 3042 emitted by the laser emitter 304 on the target paper 307, and the height of the paving roller 302 is adjusted by the first adjustment component according to the relative positions of the left laser point 3041 and the right laser point 3042 and the horizontal line 308, so that the left laser point 3041 and the right laser point 3042 emitted by the laser emitter 304 are always on the horizontal line 308, thereby making the paved road surface height consistent;

[0056] S5: Install steps S1-S4 one by one for each part;

[0057] S6: As the excavation working face continues to advance, the excavation tunnel installation steps S1-S5 are carried out in the case of newly generated coal slime water bottom plate.

[0058] The above description of the disclosed embodiments is provided in a progressive manner to enable those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for hardening coal slurry in coal mine tunnels, characterized in that: It includes coal slurry water self-priming device, stirring mechanism, paving device and walking mechanism; The walking mechanism comprises a vehicle body, and the vehicle body comprises at least a rectangular bearing plate structure; a rectangular mixed material discharge port is arranged in the middle of the vehicle body along the width direction of the vehicle body; The coal slurry water self-priming device is arranged at the front of the vehicle body, including a suction head, which is arranged in a rectangular flat-mouth structure, and the width is the same as the width of the vehicle body; it also includes a self-priming device main unit, which is fixed at the front of the vehicle body; the inlet of the self-priming device main unit is connected to the suction head through a first pipeline, and the outlet of the self-priming device main unit is connected to the coal slurry water tank through a first pipeline, and a coal slurry water flow meter is arranged on the first pipeline; the coal slurry water tank is provided with a concentration meter; the coal slurry water tank is also provided with a feeding port; The stirring mechanism is arranged in the middle of the vehicle body, located above the discharge port of the mixed material, and comprises a stirring barrel, on which a stirring frame is arranged; the stirring barrel is respectively connected with the slag feed port, the geopolymer feed port, the activator feed port and the coal slime water tank discharge port through a second pipeline; the stirring barrel is also provided with a mixed discharge port, which is connected with the mixture discharge port and is used for discharging materials along the width direction of the entire vehicle body; The paving device is arranged at the rear part of the vehicle body, two ear plates are arranged at the rear part of the vehicle body, a paving roller is arranged between the two ear plates, the paving roller is rotatably connected with the two ear plates, the ear plates are provided with vertical guide rails, and the ends of the paving roller can move up and down in the guide rails to adjust its position in the guide rails; a laser emitter is respectively arranged on the two ear plates, and a target paper is also arranged at the rear of the vehicle body. The target paper is provided with a horizontal line as a horizontal reference, and the horizontal line always remains horizontal; a camera is also arranged at the rear of the vehicle body, and the camera is used to collect the positions of the left laser point and the right laser point of the laser emitter on the target paper to obtain the inclination of both sides of the vehicle body.

2. The device for in-situ hardening of coal slurry water in coal mine tunnels according to claim 1, characterized in that: The vehicle body is provided with wheels, and the wheels are driven by a fourth electric motor; the width of the vehicle body is slightly larger than half of the width of the lane or slightly larger than one third of the width of the lane.

3. The device for in-situ hardening of coal slurry water in coal mine tunnels according to claim 1, characterized in that: An adjustment mechanism is provided at each end of the suction head, one end of the adjustment mechanism is connected to the suction head, and the other end is connected to the vehicle body. The adjustment mechanism can adjust the height of the suction head, and the main body of the self-priming device is driven to work by a first motor.

4. The device for in-situ hardening of coal slurry water in coal mine tunnels according to claim 1, characterized in that: The stirring frame is driven by a second motor to stir and mix the materials in the stirring barrel.

5. The device for in-situ hardening of coal slurry water in coal mine tunnels according to claim 1, characterized in that: It also includes the feeding device, and four feeding devices are provided, which are respectively used to provide coal slime, slag, geopolymer and activator.

6. The device for in-situ hardening of coal slurry water in coal mine tunnels according to claim 5, characterized in that: The feeding device includes a silo, a valve is provided at the outlet of the silo, and then connected to the upper side of the pipe wall of the third pipeline. One end of the third pipeline is connected to the fan and the other end is a discharge port. A second flow meter is provided at the end of the third pipeline close to the discharge port.

7. The device for in-situ hardening of coal slurry water in coal mine tunnels according to claim 1, characterized in that: It also includes a water pump, which is configured to supply water to the coal slurry water tank or to the mixing barrel.

8. The device for in-situ hardening of coal slurry water in coal mine tunnels according to claim 1, characterized in that: The paving roller is driven to rotate by a third motor, and an auxiliary baffle is respectively arranged at the ear plates on both sides of the vehicle body. The height and pitch angle of the auxiliary baffle relative to the vehicle body can be adjusted by a second adjusting component.

9. The device for in-situ hardening of coal slurry water in coal mine tunnels according to claim 1, characterized in that: It also includes a control device, which is used to control the operation of each component.

10. A method for in-situ hardening of coal slurry water in coal mine tunnels, using the in-situ hardening device for coal slurry water in coal mine tunnels according to any one of claims 1 to 10, characterized in that: The steps include: S1: Divide the excavation tunnel into two or three parts along the width direction, and the width of each part matches the width of the frame; S2: Set the in-situ hardening device in a flat position, adjust the suction head to a suitable position, and adjust the position of the flattening roller to determine a suitable laying height; set the target paper to a suitable height so that the left laser point and the right laser point emitted by the laser transmitter are on the horizontal line; and then always keep the height position of the target paper unchanged; S3: Determine the appropriate ratio of coal slime, slag, geopolymer, activator and water; S4: Control the coal slurry water in-situ hardening device to move forward, and the suction head sucks the coal slurry water at the bottom thereof into the coal slurry water tank, and obtains the ratio of coal slurry to water in the sucked coal slurry water according to the coal slurry water concentration meter, and adds coal slurry to the coal slurry water tank, or adds water to the coal slurry water tank or the mixing tank, so that the ratio of coal slurry to water reaches the designed ratio; add slag, geopolymer, and activator to the mixing tank according to the designed ratio; and use the stirring rack to stir and mix evenly; and discharge the in-situ hardening material to the ground through the mixing discharge port and the mixture discharge port; At the same time, the positions of the left and right laser points emitted by the laser transmitter on the target paper are obtained by taking photos with a camera, and the height of the paving roller is adjusted according to the relative positions of the left and right laser points and the horizontal line, so that the left and right laser points emitted by the laser transmitter are always on the horizontal line; S5: Install steps S1-S4 one by one for each part; S6: As the excavation working face continues to advance, the excavation tunnel with newly generated coal slime water bottom plate is installed in the manner of steps S1-S5.

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