Concrete spraying device for tunnel and tunnel construction method

Abstract

The invention discloses a concrete spraying device for a tunnel and a tunnel construction method. The device comprises a box body, driving structures are rotationally arranged at one ends and the middle position of the two sides of the bottom of the box body, and a remote control module is arranged in the box body; the bottom plate is arranged at the top of the box body, a feeding structure is arranged at one end of the top of the bottom plate, a feeding port and a discharging port are formed in the feeding structure, a filter screen is arranged on the feeding structure through the feeding port, a rotating structure is arranged at the other end of the top of the bottom plate, and a supporting structure is arranged on the bottom plate through the rotating structure. According to the spraying device, the rotating structure and the supporting structure are arranged, a constructor fixes the spraying part to the supporting structure, the constructor can drive the spraying part to rotate through the rotating structure, a spraying opening in the spraying part can face the wall face to be sprayed, and then the inclination angle of the spraying opening in the spraying part can be adjusted through an electric cylinder on the supporting structure; and the device can adapt to different spraying radians.

Description

Technical Field

[0001] This invention relates to the field of concrete spraying machine technology, specifically to a concrete spraying device for tunnels and a tunnel construction method. Background Technology

[0002] A concrete spraying machine is a machine that uses compressed air to continuously transport concrete through a material chamber along a conveying pipeline and spray it onto the construction surface. In tunnel, road, and slope protection operations, large-area concrete pouring and paving are required. Due to the large scale of the project, concrete spraying machines are usually used for paving to effectively improve work efficiency.

[0003] Existing concrete spraying machines require construction workers to hold the spray nozzle to spray concrete onto tunnel walls. However, when the machine is working, it is not convenient to adjust the spray arc or height of the nozzle, which cannot meet the usage requirements and results in an unsatisfactory concrete spraying effect. Moreover, existing concrete spraying machines can only spray concrete onto one side of the wall at a time. Summary of the Invention

[0004] The purpose of this invention is to provide a concrete spraying device and a tunnel construction method for tunnels, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a concrete spraying device for tunnels and a tunnel construction method, comprising: The enclosure has a drive structure rotatably installed at one end and the middle of the bottom two sides, and a remote control module is installed inside the enclosure; The bottom plate is provided on the top of the box body. A feeding structure is provided at one end of the top of the bottom plate. The feeding structure is provided with an inlet and an outlet. A filter screen is provided through the inlet of the feeding structure. A rotating structure is provided at the other end of the top of the bottom plate. A support structure is provided through the rotating structure of the bottom plate. A mixing tank is located at the top of the base plate near the feeding structure. The mixing tank is connected to the feeding structure through a discharge port. A temperature control plate is installed at the bottom of the mixing tank. Servo motors are installed at both ends of the mixing tank. Multiple mixing rollers are installed inside the mixing tank. A water tank is installed in the middle of the top of the mixing tank. Water pumps are installed at both ends of the top of the mixing tank. A conveying structure is located at the middle of the top of the base plate, and a heating pipe is provided on the outer surface of the conveying structure. The mixing tank is connected to the conveying structure. The feeding structure is located at the top of the base plate near one end of the conveying structure and is connected to the conveying structure. A conveying pipe is provided at the top of the other end of the feeding structure, and a spraying component is provided at the other end of the conveying pipe.

[0006] By adopting the above technical solution, construction workers can use this device to mix cement ash, sand, and water into concrete. Then, the construction workers can control the drive structure through the remote control module to move the device into the tunnel. The construction workers can then start the motor through the remote control module to drive the turntable to rotate on the base plate, so that the nozzles on the spraying component are facing the tunnel wall. The mixed concrete can be sprayed out from the nozzles on the spraying component with the assistance of the conveying and feeding structure. The electric cylinder on the support structure can drive the spraying component to tilt, so that it can adapt to different spraying arcs. Due to different ambient temperatures, the concrete may dry or clump inside the device. With the assistance of the temperature control plate and heating pipe, the concrete is kept warm, ensuring that the concrete is in the most suitable spraying state.

[0007] Preferably, the drive structure includes a first drive motor, a second drive motor, a rotating disk, a first gear, a second gear, and a hub. The first drive motor and the rotating disk are respectively arranged at one end and the middle position of the bottom of the housing. The output end of the first drive motor is provided with bevel teeth. The top of the rotating disk is provided with a toothed ring that meshes with the bevel teeth. The second drive motor is arranged at one end of the bottom of the rotating disk. The output end of the second drive motor is provided with the first gear. The hub is arranged at the other end of the rotating disk. The second gear is arranged at one end of the hub. The first gear and the second gear mesh.

[0008] By adopting the above technical solution, construction workers can adjust the direction of the wheel hub by coordinating the first drive motor, bevel gear, ring gear and rotating disk. Then, by coordinating the second drive motor, the first gear and the second gear, the wheel hub can be driven to rotate. Since the housing is equipped with four drive structures and each drive structure can move independently, the device can move in various ways.

[0009] Preferably, the feeding structure, conveying structure and conveying structure are all composed of a shell, a spiral roller and a power source. The spiral roller is rotatably disposed inside the shell, and the power source is disposed at one end of the shell and the output end of the power source is connected to the spiral roller.

[0010] By adopting the above technical solution, the feeding structure, conveying structure and conveying structure are all driven by a power source to rotate the spiral roller inside the outer shell, and the concrete can move with the rotation of the spiral roller, so that the concrete can be sprayed out from the spraying component.

[0011] Preferably, the rotating structure on the base plate includes a turntable and a motor. The turntable is located at one end of the top of the base plate, and the motor is located at one end of the bottom of the base plate. The output end of the motor is provided with bevel teeth, and the bottom of the turntable is provided with ring teeth. The ring teeth on the turntable mesh with the bevel teeth on the motor.

[0012] By adopting the above technical solution, the output end of the motor can drive the bevel gear to rotate, and with the assistance of the ring gear, the turntable can be driven to rotate on the base plate, thereby adjusting the orientation of the nozzle on the spray component.

[0013] Preferably, the support structure on the base plate includes a support frame, with electric cylinders installed at both ends inside the support frame. A connecting rod is installed at the output end of the electric cylinder. A rotating component is rotatably installed on the top of the support frame, and a locking component is rotatably installed on the top of the rotating component. The support frame is engaged with the spraying component through the locking component.

[0014] By adopting the above technical solution, the spraying component is fixed to the rotating component by a clamp, which can prevent the spraying component from shifting when concrete is sprayed out.

[0015] Preferably, the remote control module is electrically connected to the drive structure, the feeding structure, the temperature control board, the servo motor, the water pump, the conveying structure, the feeding structure, the motor, and the electric cylinder.

[0016] By adopting the above technical solution, construction workers can remotely control the device with the assistance of the remote control module, eliminating the need for them to work inside the tunnel for extended periods.

[0017] Preferably, the other end of the top of the base plate is provided with a round hole, the base plate is rotatably connected to the turntable through the round hole, the top of the water tank is provided with an inlet, the input end of the water pump penetrates through the side wall of the water tank, and the output end of the water pump penetrates through the top of the mixing tank.

[0018] By adopting the above technical solution, the turntable can rotate smoothly on the base plate through the round hole, and the water pump can introduce clean water from the water tank into the mixing tank, so that the mixed cement ash and sand can form concrete.

[0019] Preferably, the clamping component and the rotating component are rotatably connected, the clamping component is provided with a clamping rod, the clamping rod on the clamping component is provided with a threaded hole, and the clamping rod on the clamping component is provided with a bolt through the threaded hole.

[0020] By adopting the above technical solution, the spraying component can be stably and securely installed on the rotating component through the cooperation between the clamps, clamps, and bolts.

[0021] Preferably, the top of both sides of the support frame is provided with connecting holes, and the bottom of both sides of the rotating component is provided with connecting blocks. The support frame is rotatably connected to the rotating component through the connecting holes and connecting blocks.

[0022] The tunnel construction method using the aforementioned concrete spraying device includes the following steps: Step 1: Add cement ash and sand into the feeding structure through the feed inlet. The filter screen can filter out the cement ash and sand, preventing them from clumping and damaging the screw roller. The cement ash and sand are initially mixed in the feeding structure. Step 2: The initially mixed cement ash and sand are put into the mixing tank. Then, the servo motor is started to drive the mixing roller to rotate, so that the initially mixed cement ash and sand are further mixed. Then, the water pump is started so that the water pump can introduce clean water from the water tank into the mixing tank to wet the mixed cement ash and sand to form concrete. Step 3: The concrete enters the conveying structure and can be moved to the feeding structure through the conveying structure. Then, the feeding structure guides the concrete into the conveying pipe. Step 4: Construction workers move the device into the tunnel using the drive structure control device. Then, they start the motor via the remote control module to rotate the turntable, so that the nozzles on the spraying component face the tunnel wall. They then control the conveying and feeding structures to guide the concrete into the conveying pipe and discharge it from the spraying component, allowing the concrete to be sprayed onto the tunnel wall. Finally, by extending and retracting the output end of the electric cylinder, the construction workers can rotate the rotating component on the support frame to adjust the tilt angle of the spraying component and thus the spraying arc.

[0023] Compared with the prior art, the beneficial effects of the present invention are: The tunnel uses a concrete spraying device and tunnel construction method, which is equipped with a rotating structure and a supporting structure. The construction workers fix the spraying parts to the supporting structure. The construction workers can drive the spraying parts to rotate through the rotating structure so that the spray nozzles on the spraying parts can face the wall to be sprayed. Then, the electric cylinder on the supporting structure can adjust the tilt angle of the spray nozzles on the spraying parts so that it can adapt to different spraying arcs.

[0024] The tunnel uses a concrete spraying device and tunnel construction method. The construction workers use the cooperation between the servo motor and the mixing roller to mix the cement ash in the mixing tank. The mixing tank is equipped with a temperature control plate and the conveying structure is equipped with heating pipes. Water can be injected into the mixing tank through the cooperation between the water tank and the water pump. The two work together to control the temperature of the concrete, preventing the concrete from drying out due to excessive temperature or clumping due to excessive temperature, and ensuring that the concrete is in the most suitable spraying state. Attached Figure Description

[0025] Figure 1 This is the front view of the present invention; Figure 2 This is a cross-sectional view of the main structure of the present invention; Figure 3This is a top view of the present invention; Figure 4 This is a perspective view of the base plate of the present invention; Figure 5 This is a perspective view of the water tank of the present invention; Figure 6 This is a side view sectional view of the water tank structure of the present invention; Figure 7 For the present invention Figure 1 Enlarged view of the structure at point A in the middle; Figure 8 For the present invention Figure 2 Enlarged view of the structure at point B in the middle.

[0026] In the diagram: 1. Box body; 2. Drive structure; 3. Remote control module; 4. Base plate; 5. Feeding structure; 6. Filter screen; 7. Mixing tank; 8. Temperature control board; 9. Servo motor; 10. Mixing roller; 11. Water tank; 12. Water pump; 13. Conveying structure; 14. Heating tube; 15. Feeding structure; 16. Conveying pipe; 17. Turntable; 18. Motor; 19. Support frame; 20. Electric cylinder; 21. Connecting rod; 22. Rotating component; 23. Spraying component; 24. Clamping component. Detailed Implementation

[0027] 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 a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figure 1-8The present invention provides an embodiment of a concrete spraying device and a tunnel construction method for tunnels, comprising: a box body 1, with a drive structure 2 rotatably mounted at one end and the middle of the bottom of the box body 1, and a remote control module 3 installed inside the box body 1; a bottom plate 4, with a bottom plate 4 mounted on top of the box body 1, a feeding structure 5 mounted at one end of the top of the bottom plate 4, the feeding structure 5 having an inlet and an outlet, a filter screen 6 installed through the inlet of the feeding structure 5, and a rotating structure mounted at the other end of the top of the bottom plate 4, with a support structure installed through the rotating structure of the bottom plate 4. The structure includes: a mixing tank 7, located at the top of the base plate 4 near the feeding structure 5, connected to the feeding structure 5 via a discharge port; a temperature control plate 8 at the bottom of the mixing tank 7; servo motors 9 at both ends of the mixing tank 7; multiple mixing rollers 10 inside the mixing tank 7; a water tank 11 at the center of the top of the mixing tank 7; and water pumps 12 at both ends of the top of the mixing tank 7. A conveying structure 13 is located at the center of the top of the base plate 4, with heating pipes 14 on its outer surface. The mixing tank 7 is connected to the conveying structure 13; the feeding structure 15 is located on the top of the base plate 4 near the conveying structure 13 and is connected to the conveying structure 13. A conveying pipe 16 is located at the top of the other end of the feeding structure 15, and a spraying element 23 is located at the other end of the conveying pipe 16. Construction workers can use this device to mix cement ash, sand, and water into concrete. Then, construction workers can use the remote control module 3 to control the drive structure 2, allowing the device to be moved into the tunnel. Construction workers can then use the remote control module 3 to start the motor 18, driving the rotation... The disc 17 rotates on the base plate 4, so that the nozzle on the spraying component 23 can face the tunnel wall. The mixed concrete can be sprayed out from the nozzle on the spraying component 23 with the assistance of the conveying structure 13 and the feeding structure 15. The electric cylinder 20 on the support structure can drive the spraying component 23 to tilt, so that it can adapt to different spraying arcs. Due to different ambient temperatures, the concrete is prone to drying or clumping inside the device. With the assistance of the temperature control plate 8 and the heating pipe 14, the concrete is kept warm, ensuring that the concrete is in the most suitable spraying state.

[0029] In this embodiment, the drive structure 2 includes a first drive motor, a second drive motor, a rotating disk, a first gear, a second gear, and a hub. The first drive motor and the rotating disk are located at one end of each side of the bottom of the housing 1 and at the middle position. The output end of the first drive motor is provided with bevel teeth. The top of the rotating disk is provided with a gear ring that meshes with the bevel teeth. The second drive motor is located at one end of the bottom of the rotating disk. The output end of the second drive motor is provided with the first gear. The hub is located at the other end of the rotating disk. The second gear is located at one end of the hub. The first gear and the second gear mesh. The construction personnel can adjust the direction of the hub by cooperating with the first drive motor, the bevel teeth, the ring teeth, and the rotating disk. Then, by cooperating with the second drive motor, the first gear, and the second gear, the hub can be driven to rotate. Since there are four drive structures 2 on the housing 1 and each drive structure 2 can move independently, the device can move in various ways.

[0030] In this embodiment, the feeding structure 5, the conveying structure 13, and the feeding structure 15 are all composed of a shell, a spiral roller, and a power source. The spiral roller is rotatably installed inside the shell, while the power source is installed at one end of the shell and the output end of the power source is connected to the spiral roller. The feeding structure 5, the conveying structure 13, and the feeding structure 15 are all driven by the power source to rotate the spiral roller inside the shell, and the concrete can move with the rotation of the spiral roller, so that the concrete can be sprayed out from the spraying component 23.

[0031] In this embodiment, the rotating structure on the base plate 4 includes a turntable 17 and a motor 18. The turntable 17 is located at the top of the base plate 4, and the motor 18 is located at the bottom of the base plate 4. The output end of the motor 18 is provided with bevel teeth, and the bottom of the turntable 17 is provided with ring teeth. The ring teeth on the turntable 17 mesh with the bevel teeth on the motor 18. The output end of the motor 18 can drive the bevel teeth to rotate. With the assistance of the ring teeth, the turntable 17 is driven to rotate on the base plate 4, which can adjust the orientation of the nozzle on the spray component 23.

[0032] In this embodiment, the support structure on the base plate 4 includes a support frame 19. Both ends of the support frame 19 are equipped with electric cylinders 20. The output end of the electric cylinders 20 is equipped with a connecting rod 21. A rotating component 22 is rotatably mounted on the top of the support frame 19. A locking component 24 is rotatably mounted on the top of the rotating component 22. The support frame 19 is engaged with the spraying component 23 through the locking component 24. The spraying component 23 is fixed on the rotating component 22 through the locking component 24. When concrete is sprayed from the spraying component 23, it can prevent the spraying component 23 from deviating.

[0033] In this implementation, the remote control module 3 is electrically connected to the drive structure 2, the feeding structure 5, the temperature control board 8, the servo motor 9, the water pump 12, the conveying structure 13, the feeding structure 15, the motor 18, and the electric cylinder 20. With the assistance of the remote control module 3, construction personnel can remotely control the device without having to work inside the tunnel for extended periods.

[0034] In this embodiment, a round hole is provided at the other end of the top of the base plate 4. The base plate 4 is rotatably connected to the turntable 17 through the round hole. The top of the water tank 11 is provided with an inlet. The input end of the water pump 12 passes through the side wall of the water tank 11, and the output end of the water pump 12 passes through the top of the mixing tank 7. The turntable 17 can rotate smoothly on the base plate 4 through the round hole. The water pump 12 can introduce the clean water in the water tank 11 into the mixing tank 7, so that the mixed cement ash and sand can form concrete.

[0035] In this embodiment, the clamp 24 and the rotating part 22 are rotatably connected. The clamp 24 is provided with a clamp rod, the clamp rod on the clamp 24 is provided with a threaded hole, and the clamp rod on the clamp 24 is provided with a bolt through the threaded hole. Through the cooperation between the clamp 24, the clamp rod and the bolt, the spraying part 23 can be stably and firmly installed on the rotating part 22.

[0036] In this embodiment, the top of both sides of the support frame 19 is provided with connecting holes, and the bottom of both sides of the rotating part 22 is provided with connecting blocks. The support frame 19 is rotatably connected to the rotating part 22 through the connecting holes and connecting blocks.

[0037] Example 1, such as Figure 1-2 As shown, the tunnel construction method using a concrete spraying device includes the following steps: Step 1: Cement ash and sand are added to the feeding structure 5 through the feed inlet. The filter screen 6 acts as a filter to prevent lumps of cement ash and sand from damaging the spiral roller. The cement ash and sand are initially mixed in the feeding structure 5. Step 2: The initially mixed cement ash and sand enter the mixing tank 7. Then, the servo motor 9 is started to drive the mixing roller 10 to rotate, further mixing the initially mixed cement ash and sand. Then, the water pump 12 is started to introduce clean water from the water tank 11 into the mixing tank 7, wetting the mixed cement ash and sand to form concrete. Step 3: The concrete enters the conveying structure 13. The concrete can be conveyed through the conveyor... The conveying structure 13 is moved to the feeding structure 15, and then the concrete is introduced into the conveying pipe 16 through the feeding structure 15; Step 4: The construction personnel move the drive structure 2 to the inside of the tunnel by controlling the device. Then, the construction personnel start the motor 18 through the remote control module 3 to drive the turntable 17 to rotate, so that the nozzle on the spraying part 23 can face the tunnel wall. Then, the construction personnel control the conveying structure 13 and the feeding structure 15 to allow the concrete to be introduced into the conveying pipe 16 and discharged from the spraying part 23, so that the concrete can be sprayed on the tunnel wall. Then, the construction personnel can drive the rotating part 22 to rotate on the support frame 19 by extending and retracting the output end of the electric cylinder 20, so as to adjust the tilt angle of the spraying part 23 and adjust the spraying arc.

[0038] Example 2, as Figure 3As shown, the number of conveying structures 13 and feeding structures 15 on the device is the same and controlled between 1 and 3, which increases the efficiency of concrete spraying. Construction personnel can use devices with different numbers of conveying structures 13 and feeding structures 15 according to different construction environments. Moreover, the spiral rollers on the conveying structures 13 and feeding structures 15 rotate in opposite directions, which can block the concrete. During the mixing of water, cement ash and sand, the spiral rollers on the conveying structure 13 rotate in opposite directions, which can prevent cement ash and sand from entering the interior of the conveying structure 13. There are multiple mixing rollers 10 inside the mixing tank 7 and the heights of adjacent mixing rollers 10 are different, which makes the cement ash and sand mix more thoroughly.

[0039] For those skilled in the art, the present invention is not limited to the details of the exemplary embodiments described above, and the invention can be implemented in other specific forms without departing from the spirit or scope thereof. Therefore, the embodiments of the present invention are exemplary and not restrictive. The scope of the invention is defined by the appended claims rather than the foregoing description, and therefore all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A concrete spraying device for tunnels, characterized in that, include: The box (1) has a drive structure (2) rotatably installed at one end and the middle of the bottom two sides of the box (1), and a remote control module (3) is installed inside the box (1). The bottom plate (4) is provided on the top of the box (1). A feeding structure (5) is provided at one end of the top of the bottom plate (4). The feeding structure (5) is provided with an inlet and an outlet. A filter screen (6) is provided through the inlet of the feeding structure (5). A rotating structure is provided at the other end of the top of the bottom plate (4). A support structure is provided through the rotating structure of the bottom plate (4). A mixing tank (7) is located at the top of the bottom plate (4) near the feeding structure (5). The mixing tank (7) is connected to the feeding structure (5) through the discharge port. A temperature control plate (8) is provided at the bottom of the mixing tank (7). A servo motor (9) is provided at both ends of the mixing tank (7). Multiple mixing rollers (10) are provided inside the mixing tank (7). A water tank (11) is provided at the middle position of the top of the mixing tank (7). A water pump (12) is provided at both ends of the top sides of the mixing tank (7). The conveying structure (13) is located at the middle position of the top of the base plate (4). The outer surface of the conveying structure (13) is provided with a heating pipe (14). The mixing tank (7) is connected to the conveying structure (13). The feeding structure (15) is located at the top of the base plate (4) near the conveying structure (13) and is connected to the conveying structure (13). The top of the other end of the feeding structure (15) is provided with a conveying pipe (16), and the other end of the conveying pipe (16) is provided with a spraying element (23).

2. The concrete spraying device for tunnels according to claim 1, characterized in that: The drive structure (2) includes a first drive motor, a second drive motor, a rotating disk, a first gear, a second gear, and a hub. The first drive motor and the rotating disk are provided at one end and the middle position of the bottom of the housing (1). The output end of the first drive motor is provided with bevel teeth. The top of the rotating disk is provided with a toothed ring that meshes with the bevel teeth. The bottom end of the rotating disk is provided with a second drive motor. The output end of the second drive motor is provided with a first gear. The hub is provided at the other end of the rotating disk. The hub is provided with a second gear at one end. The first gear and the second gear mesh.

3. A concrete spraying device for tunnels according to claim 2, characterized in that: The feeding structure (5), conveying structure (13) and feeding structure (15) are all composed of a shell, a spiral roller and a power source. The spiral roller is rotatably installed inside the shell, while the power source is installed at one end of the shell and the output end of the power source is connected to the spiral roller.

4. A concrete spraying device for tunnels according to claim 3, characterized in that: The rotating structure on the base plate (4) includes a turntable (17) and a motor (18). The turntable (17) is located at the top of the base plate (4) and the motor (18) is located at the bottom of the base plate (4). The output end of the motor (18) is provided with bevel teeth, and the bottom of the turntable (17) is provided with ring teeth. The ring teeth on the turntable (17) mesh with the bevel teeth on the motor (18).

5. A concrete spraying device for tunnels according to claim 4, characterized in that: The support structure on the base plate (4) includes a support frame (19). Both ends of the support frame (19) are provided with electric cylinders (20). The output end of the electric cylinder (20) is provided with a connecting rod (21). A rotating part (22) is rotatably provided on the top of the support frame (19). A locking part (24) is rotatably provided on the top of the rotating part (22). The support frame (19) is locked to the spraying part (23) through the locking part (24).

6. A concrete spraying device for tunnels according to claim 5, characterized in that: The remote control module (3) is electrically connected to the drive structure (2), the feeding structure (5), the temperature control board (8), the servo motor (9), the water pump (12), the conveying structure (13), the feeding structure (15), the motor (18), and the electric cylinder (20).

7. A concrete spraying device for tunnels according to claim 4, characterized in that: The bottom plate (4) has a round hole at the other end of its top. The bottom plate (4) is rotatably connected to the turntable (17) through the round hole. The top of the water tank (11) is provided with an inlet. The input end of the water pump (12) penetrates the side wall of the water tank (11), and the output end of the water pump (12) penetrates the top of the mixing tank (7).

8. A concrete spraying device for tunnels according to claim 5, characterized in that: The clamp (24) is rotatably connected to the rotating part (22). The clamp (24) is provided with a clamp rod, the clamp rod on the clamp (24) is provided with a threaded hole, and the clamp rod on the clamp (24) is provided with a bolt through the threaded hole.

9. A concrete spraying device for tunnels according to claim 5, characterized in that: The top of both sides of the support frame (19) is provided with connecting holes, and the bottom of both sides of the rotating part (22) is provided with connecting blocks. The support frame (19) is rotatably connected to the rotating part (22) through the connecting holes and connecting blocks.

10. A tunnel construction method, employing the tunnel concrete spraying device as described in any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Add cement ash and sand into the feeding structure (5) through the feed inlet. The filter screen (6) can filter and prevent the cement ash and sand from caking and damaging the spiral roller. The cement ash and sand are initially mixed in the feeding structure (5). Step 2: The initially mixed cement ash and sand are put into the mixing tank (7), and then the servo motor (9) is started to drive the mixing roller (10) to rotate, so that the initially mixed cement ash and sand are further mixed. Then the water pump (12) is started so that the water pump (12) can introduce the clean water in the water tank (11) into the mixing tank (7) to wet the mixed cement ash and sand to form concrete. Step 3: The concrete enters the conveying structure (13) and can be moved to the feeding structure (15) through the conveying structure (13). Then, the concrete is introduced into the conveying pipe (16) through the feeding structure (15). Step 4: The construction personnel move the device through the drive structure (2) to the inside of the tunnel. Then, the construction personnel start the motor (18) through the remote control module (3) to drive the turntable (17) to rotate so that the nozzle on the spraying part (23) can face the tunnel wall. Then, the construction personnel control the conveying structure (13) and the feeding structure (15) so that the concrete can be introduced into the conveying pipe (16) and discharged from the spraying part (23) so that the concrete can be sprayed on the tunnel wall. Then, the construction personnel can drive the rotating part (22) to rotate on the support frame (19) by extending and retracting the output end of the electric cylinder (20) to adjust the tilt angle of the spraying part (23) and adjust the spraying arc.

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