Tunnel pilot tunnel expanding excavation method
By designing equipment for tunnel guide hole expansion, the problem of operating risks and low efficiency of artificial spray concrete is solved, and safer and more efficient concrete jetting and guide hole expansion is achieved.
Patent Information
- Application Number
- CN202411602425.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-11
- Publication Date
- 2025-02-11
AI Technical Summary
During tunnel construction, artificial spray concrete has operational risks and affects work efficiency.
A tunnel hole expansion device is designed, including a body, a moving assembly, a lift assembly and a regulating assembly, for rapid movement and adjustment of the position, height and injection direction of the injection gun.
It reduces the risk of artificially carrying the jet gun into the inside of the guide hole, improves the working efficiency of jet concrete, increases the injection range, and reduces disturbance to the earth.
Smart Images
Figure CN119412080A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of tunnel pilot tunnel expansion, and in particular to a tunnel pilot tunnel expansion method. Background Art
[0002] In tunnel construction, the advance small pilot tunnel excavation method usually refers to a tunnel construction method in which a pilot tunnel is first excavated at an appropriate position within the tunnel design section, and then expansion, support and other operations are carried out according to the design section after the pilot tunnel is penetrated or advanced by a certain length.
[0003] In the related tunnel excavation method, a small tunnel is first excavated by an excavator, and then the soil is transported by a dump truck. Then concrete is sprayed on the side wall of the small tunnel, and a steel mesh, steel arch frame and anchor rods are used to form a support. Then the remaining section is excavated and the above actions are repeated.
[0004] With respect to the above-mentioned related technologies, the inventors found that when construction workers are spraying concrete, workers usually stand on a mechanical arm to spray concrete manually, which has certain operational risks and affects work efficiency, so it needs to be improved. Summary of the invention
[0005] In order to improve the problem of artificial shotcrete affecting work efficiency, the present application provides a tunnel pilot hole expansion method.
[0006] In the first aspect, the present application provides a tunnel guide hole expansion device, which adopts the following technical solution: A tunnel guide hole expansion equipment comprises a machine body and a spray gun arranged on the machine body for spraying concrete; the machine body is provided with a moving component for moving the spray gun, the machine body is provided with a lifting component for adjusting the height position of the spray gun; the machine body is provided with an adjusting component for adjusting the spraying direction of the spray gun.
[0007] By adopting the above technical solution, the moving component quickly moves the spray gun on the machine body to the inside of the guide tunnel, reducing the danger of manually carrying the spray gun into the inside of the guide tunnel. The spray gun is suspended in the air inside the guide tunnel, reducing the disturbance to the earth; the lifting component adjusts the height of the spray gun, and the adjusting component adjusts the spray direction of the injector, thereby increasing the spray range of the spray gun and improving the working efficiency of shotcrete.
[0008] Preferably, the moving assembly includes a reference frame, a moving block and a moving cylinder; the reference frame is arranged on the machine body, the moving block is slidably arranged on the reference frame along the length direction of the reference frame, and the spray gun is arranged on the moving block; the moving cylinder is arranged on the reference frame, the telescopic direction of the output end of the moving cylinder is parallel to the length direction of the reference frame, and the output end of the moving cylinder is connected to the moving block.
[0009] By adopting the above technical solution, the output end of the mobile cylinder drives the moving block to move along the length direction of the reference frame. By utilizing the telescopic movement of the output end of the mobile cylinder, the moving block can be driven to drive the spray gun to move back and forth along the length direction of the reference frame, thereby realizing convenient movement of the position of the spray gun.
[0010] Preferably, the lifting assembly includes a lifting rod, a lifting slider, a lifting screw and a lifting motor; the end of the reference frame facing the machine body is rotatably connected to the machine body, and the lifting rod is rotatably set on the reference frame; the lifting slider is slidably set on the machine body, and the end of the lifting rod away from the reference frame is rotatably connected to the lifting slider; the lifting screw is rotatably set on the machine body, and the lifting motor is set on the machine body to drive the lifting screw to rotate.
[0011] By adopting the above technical solution, the output end of the lifting motor drives the lifting screw to rotate, the rotating lifting screw drives the lifting slider, the moving lifting slider drives the lifting rod to move, and the lifting rod assists in lifting the reference frame, thereby adjusting the height position of the spray gun relative to the machine body and increasing the spraying range of the spray gun, so as to facilitate more convenient and efficient spraying of concrete inside the guide tunnel and improve the work efficiency of guide tunnel expansion.
[0012] Preferably, an extension frame is provided on the moving block, an extension block is slidably provided on the extension frame along the length direction of the extension frame, and the spray gun is provided on the extension block; an extension component is provided on the extension frame to drive the extension block to slide along the length direction of the extension frame.
[0013] By adopting the above technical solution, the extension assembly drives the extension block to drive the spray gun to move on the extension frame, further increasing the movement range of the spray gun and improving the spraying range of the spray gun, further reducing the distance between the machine body and the internal section of the guide tunnel, thereby reducing the disturbance of the machine body to the earthwork section.
[0014] Preferably, the extension assembly includes a traction rope, a traction ring, a reset rope and a reset ring; the traction rope is arranged on the side wall of the extension block away from the reference frame, the traction ring is arranged at the end of the extension frame away from the reference frame, the end of the traction rope away from the extension block passes through the traction ring and is connected to the end of the reference frame facing the extension frame; the reset rope is arranged on the side wall of the extension block away from the traction rope, the reset ring is arranged at the end of the extension frame away from the traction ring, the end of the reset rope away from the extension block passes through the reset ring and is connected to the end of the reference frame facing the extension frame.
[0015] By adopting the above technical solution, with the help of the driving force of the mobile cylinder on the mobile block, when the mobile block drives the extension frame away from the machine body, the traction rope pulls the extension block and the spray gun gradually away from the machine body, and when the mobile block drives the extension frame gradually close to the machine body, the reset rope pulls the extension block and the spray gun gradually close to the machine body. The power of the mobile cylinder is used to synchronously drive the extension block and the spray gun to move, reducing the need for adding a power source to drive the extension block to move, and realizing the linkage between the moving component and the extension component.
[0016] Preferably, the adjustment assembly includes a mounting block, a rotating frame and an adjustment motor; the mounting block is arranged between the extension block and the spray gun, the rotating frame is rotatably arranged on the mounting block, and the rotating frame is connected to the spray gun, and the adjustment motor is arranged on the mounting block to drive the rotating frame to rotate.
[0017] By adopting the above technical solution, the output end of the regulating motor drives the rotating frame and the spray gun to rotate, so that the spray gun rotates relative to the mounting block to adjust the spray direction of the spray gun, thereby increasing the spray range of the spray gun.
[0018] Preferably, the mounting block is rotatably connected to the extension block, and the extension block is provided with a driving member for driving the mounting block to rotate.
[0019] By adopting the above technical solution, the driving member drives the mounting block to drive the spray gun to rotate relative to the extension block, further increasing the spray range of the spray gun, so as to facilitate more convenient and efficient concrete spraying at various locations inside the guide tunnel.
[0020] Preferably, an auxiliary support assembly is provided at the end of the machine body facing the spray gun to assist in supporting the machine body.
[0021] By adopting the above technical solution, when the moving component drives the spray gun gradually away from the machine body to perform concrete spraying operations, the center of gravity of the machine body and the spray gun as a whole shifts, and the auxiliary support component provides auxiliary support to the machine body, thereby reducing the shaking of the machine body and the spray gun as a whole during the spraying operation of the spray gun, reducing the disturbance to the earthwork, and ensuring the stable operation of the spray gun.
[0022] Preferably, the auxiliary support assembly includes a mounting rod, a pushing member, an auxiliary support block, an auxiliary support rod, a connecting block and a connecting rod; the mounting rod is arranged at the end of the machine body facing the spray gun, the pushing member is arranged inside the mounting rod, the auxiliary support block is arranged at the output end of the pushing member, and the pushing member is used to drive the auxiliary support block closer to or away from the ground; the auxiliary support rod is rotatably arranged on the mounting rod, and the auxiliary support rods are distributed at intervals along the circumference of the auxiliary support rod; the connecting block is slidably arranged on the mounting rod, the connecting block, the connecting rod and the auxiliary support rod are respectively arranged in one-to-one correspondence, and the end of each auxiliary support rod facing the mounting rod is rotatably connected to the connecting block; the connecting rod is rotatably arranged on each group of auxiliary support rods, and the end of each connecting rod away from the auxiliary support rod is rotatably connected to the auxiliary support block.
[0023] By adopting the above technical solution, the output end of the pushing member drives the auxiliary support block to gradually contact the ground to provide auxiliary support for the machine body; in the process of the pushing member driving the auxiliary support block to move, the auxiliary support block drives the auxiliary support rod and the connecting block to move through the connecting rod, and makes the auxiliary support rod rotate relative to the connecting block, and utilizes the contact between the auxiliary support rod and the ground to provide auxiliary support for the peripheral position of the auxiliary support block, thereby further improving the stability of the auxiliary support for the machine body.
[0024] Second, The present application provides a method for expanding a tunnel guide hole, comprising the following steps: Pilot tunnel excavation: The excavator digs the pilot tunnel for earthwork; Adjust the position: the moving component moves the position of the spray gun, and the lifting component moves the height of the spray gun to move the spray gun into the guide hole; Forming support: The adjustment component adjusts the spraying direction of the spray gun; the spray gun sprays concrete on the inner wall of the pilot tunnel, and adds steel mesh, steel arch frame and anchor rods inside the pilot tunnel, and sprays concrete again to form support; Repeated operation: expand the guide tunnel section that forms the interior of the support again, and gradually repeat the above construction operations.
[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. The spray gun on the machine body is quickly moved to the inside of the pilot tunnel by setting a moving component, which reduces the danger of manually carrying the spray gun into the pilot tunnel. The spray gun is suspended in the pilot tunnel, which reduces the disturbance to the earthwork; the lifting component adjusts the height of the spray gun, and the adjustment component adjusts the spray direction of the sprayer, thereby increasing the spray range of the spray gun and improving the working efficiency of shotcrete; 2. By setting an extension assembly to drive the extension block to drive the spray gun to move on the extension frame, the movement range of the spray gun is further increased, and the spraying range of the spray gun is improved, and the distance between the machine body and the internal section of the guide tunnel is further reduced, thereby reducing the disturbance of the machine body to the earthwork section; 3. By setting up auxiliary support components to assist the machine body, the shaking of the machine body and the spray gun as a whole during the spraying operation of the spray gun is reduced, the disturbance to the earthwork is reduced, and the stable operation of the spray gun is ensured. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 It is a structural schematic diagram of a tunnel guide hole expansion method according to an embodiment of the present application.
[0027] Figure 2 It is a cross-sectional schematic diagram used to reflect the connection relationship between the moving component and the lifting component.
[0028] Figure 3 It is a structural diagram used to reflect the connection relationship between the extension components and the extension blocks.
[0029] Figure 4 It is a structural diagram used to reflect the auxiliary support components.
[0030] Description of reference numerals: 1. Machine body; 11. Spray gun; 2. Moving assembly; 21. Reference frame; 22. Moving block; 23. Moving cylinder; 3. Lifting assembly; 31. Lifting rod; 32. Lifting slider; 33. Lifting screw; 34. Lifting motor; 4. Adjusting assembly; 41. Mounting block; 42. Rotating frame; 43. Adjusting motor; 5. Extension frame; 51. Extension block; 511. Driving member; 6. Extension assembly; 61. Traction rope; 62. Traction ring; 63. Reset rope; 64. Reset ring; 7. Auxiliary support assembly; 71. Mounting rod; 72. Pushing member; 73. Auxiliary support block; 74. Auxiliary support rod; 75. Connecting block; 76. Connecting rod. DETAILED DESCRIPTION
[0031] The following is combined with Figure 1-4 This application is described in further detail.
[0032] The embodiment of the present application discloses a method for expanding a tunnel pilot hole, which is used for quickly and conveniently spraying concrete and improving the efficiency of pilot hole excavation.
[0033] Reference Figure 1 and Figure 2A tunnel pilot hole expansion device includes a body 1 placed on the ground and a spray gun 11 installed on the body 1 for spraying concrete. In this embodiment, the body 1 can be a concrete transport vehicle. A moving component 2 is installed on the body 1 for moving the spray gun 11. A lifting component 3 is installed on the body 1 for adjusting the height of the spray gun 11 relative to the body 1. An adjusting component 4 is installed on the body 1 for adjusting the spraying direction of the spray gun 11.
[0034] Reference Figure 1 and Figure 2 The moving assembly 2 includes a reference frame 21, a moving block 22 and a moving cylinder 23; the reference frame 21 is rotatably connected to the machine body 1, and the spray gun 11 is located at one end of the reference frame 21 away from the rotational connection between the reference frame 21 and the machine body 1. The moving block 22 is slidably connected to the inside of the reference frame 21, and the moving block 22 can move along the length direction of the reference frame 21. The moving cylinder 23 is fixedly connected to the inside of the reference frame 21, and the telescopic direction of the output end of the moving cylinder 23 is parallel to the length direction of the reference frame 21, and the output end of the moving cylinder 23 is fixedly connected to the moving block 22 to drive the moving block 22 to move along the length direction of the moving frame.
[0035] Reference Figure 1 and Figure 2 The lifting assembly 3 includes a lifting rod 31, a lifting slider 32, a lifting screw 33 and a lifting motor 34; the lifting screw 33 is rotatably connected to the machine body 1, the lifting slider 32 is sleeved on the lifting screw 33, the lifting slider 32 is threadedly connected to the lifting screw 33, and the lifting slider 32 is slidably connected to the machine body 1. The lifting motor 34 is fixedly connected to the machine body 1, and the output end of the lifting motor 34 is fixedly connected to the lifting screw 33 to drive the lifting screw 33 to rotate.
[0036] Reference Figure 1 and Figure 2 The lifting rod 31 is rotatably connected between the lifting slider 32 and the reference frame 21 , and the reference frame 21 is supported by the lifting rod 31 , so that the end of the reference frame 21 close to the spray gun 11 is driven to move toward or away from the machine body 1 .
[0037] Reference Figure 1 and Figure 2 The moving block 22 is integrally formed with an extension frame 5, and the extension frame 5 is slidably connected to an extension block 51 along the length direction of the extension frame 5 through a guide rod. The spray gun 11 is located on the extension block 51, and an extension assembly 6 is installed on the extension frame 5 to drive the extension block 51 to move.
[0038] Reference Figure 1 and Figure 2The adjustment component 4 includes a mounting block 41, a rotating frame 42 and an adjustment motor 43; the mounting block 41 is rotatably connected to the extension block 51 through a rotating shaft, and a driving member 511 is installed on the extension block 51. In this embodiment, the driving member 511 can be a driving motor; the output end of the driving member 511 is fixedly connected to the rotating shaft to drive the mounting block 41 to rotate relative to the extension block 51.
[0039] Reference Figure 1 and Figure 2 The rotating frame 42 is rotatably connected to the end of the mounting block 41 away from the extension block 51, and the spray gun 11 is fixedly connected to the end of the rotating frame 42 away from the mounting block 41 through a clamp. The adjustment motor 43 is fixedly embedded in the mounting block 41, and the output end of the adjustment motor 43 is fixedly connected to the rotating frame 42, so as to drive the rotating frame 42 to drive the spray gun 11 to rotate relative to the mounting block 41.
[0040] Reference Figure 2 and Figure 3 The extension assembly 6 includes a traction rope 61, a traction ring 62, a reset rope 63 and a reset ring 64; the traction ring 62 is fixedly connected to the end of the extension frame 5 facing the spray gun 11, and the reset ring 64 is fixedly connected to the end of the extension frame 5 away from the spray gun 11. The traction rope 61 is fixedly connected to the side wall of the extension block 51 facing the spray gun 11, and the end of the traction rope 61 away from the extension block 51 passes through the traction ring 62 and is fixedly connected to the end of the reference frame 21 facing the spray gun 11. The reset rope 63 is fixedly connected to the side wall of the extension block 51 away from the spray gun 11, and the end of the reset rope 63 away from the extension block 51 passes through the reset ring 64 and is fixedly connected to the end of the reference frame 21 facing the spray gun 11.
[0041] Reference Figure 2 and Figure 3 When the moving cylinder 23 drives the moving block 22 to drive the extension frame 5 to gradually move away from the machine body 1, the traction rope 61 pulls the extension block 51, so that the extension block 51 drives the spray gun 11 to gradually move away from the machine body 1. When the moving cylinder 23 drives the moving block 22 to drive the extension frame 5 to gradually approach the machine body 1, the reset rope 63 pulls the extension block 51, so that the extension block 51 drives the spray gun 11 to gradually approach the machine body 1.
[0042] Reference Figure 1 and Figure 4The side wall of the machine body 1 facing the spray gun 11 is equipped with an auxiliary support assembly 7 for auxiliary support of the end facing the spray gun 11. The auxiliary support assembly 7 includes a mounting rod 71, a pusher 72, an auxiliary support block 73, an auxiliary support rod 74, a connecting block 75 and a connecting rod 76; the mounting rod 71 is fixedly connected to the end of the machine body 1 facing the spray gun 11. In this embodiment, the pusher 72 can be a push cylinder, which is fixedly embedded in the mounting rod 71, and the auxiliary support block 73 is fixedly connected to the output end of the pusher 72 to contact the ground.
[0043] Reference Figure 1 and Figure 4 The connecting block 75 is slidably connected to the side wall of the mounting rod 71, and the connecting rods 76 are spaced apart along the circumference of the mounting rod 71. Each group of connecting blocks 75 can slide along the length direction of the mounting rod 71. The auxiliary support rods 74 are arranged in a one-to-one correspondence with the connecting blocks 75 and the connecting rods 76, and each group of auxiliary support rods 74 is rotatably connected to the corresponding connecting block 75. Each group of connecting rods 76 is rotatably connected between the corresponding auxiliary support rod 74 and the auxiliary support block 73, so that the auxiliary support rod 74 is driven to move through the movement of the auxiliary support block 73 and resist the ground, thereby providing auxiliary support to the machine body 1.
[0044] The implementation principle of a tunnel guide hole expansion device in the embodiment of the present application is: The machine body 1 drives the spray gun 11 to move to the front of the guide hole, and the output end of the moving cylinder 23 drives the moving block 22 to gradually move away from the machine body 1, so that the moving block 22 drives the spray gun 11 to gradually move to the inside of the guide hole. The output end of the lifting motor 34 drives the lifting screw 33 to rotate, and the rotating lifting screw 33 drives the lifting slider 32 to move, and the lifting rod 31 lifts the reference frame 21 and the spray gun 11 to adjust the height position of the spray gun 11 inside the guide hole.
[0045] Finally, by adjusting the output end of the motor 43 to drive the rotating frame 42 to drive the spray gun 11 to rotate, the spraying range of the spray gun 11 is adjusted, thereby replacing the manual spraying method of concrete and realizing fast and convenient spraying of concrete inside the guide tunnel, thereby speeding up the construction of support, reducing the disturbance of earthwork, and improving the work efficiency of the guide tunnel expansion.
[0046] The present application also discloses a method for expanding a tunnel guide hole, comprising the following steps: Pilot tunnel excavation: The excavator digs the pilot tunnel for earthwork; Adjust the position: the moving component 2 moves the position of the spray gun 11, and the lifting component 3 moves the height of the spray gun 11, so as to move the spray gun 11 to the inside of the guide hole; Forming support: the adjustment component 4 adjusts the spraying direction of the spray gun 11; the spray gun 11 sprays concrete on the inner wall of the pilot tunnel, and adds a steel mesh, a steel arch frame and an anchor rod inside the pilot tunnel, and sprays concrete again to form support; Repeated operation: expand the guide tunnel section that forms the interior of the support again, and gradually repeat the above construction operations.
[0047] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A tunnel guide hole expansion equipment, characterized in that: The invention comprises a machine body (1) and a spray gun (11) arranged on the machine body (1) for spraying concrete; the machine body (1) is provided with a moving assembly (2) for moving the spray gun (11); the machine body (1) is provided with a lifting assembly (3) for adjusting the height position of the spray gun (11); the machine body (1) is provided with an adjusting assembly (4) for adjusting the spraying direction of the spray gun (11).
2. The tunnel guide hole expansion equipment according to claim 1, characterized in that: The moving assembly (2) comprises a reference frame (21), a moving block (22) and a moving cylinder (23); the reference frame (21) is arranged on the machine body (1); the moving block (22) is slidably arranged on the reference frame (21) along the length direction of the reference frame (21), and the spray gun (11) is arranged on the moving block (22); the moving cylinder (23) is arranged on the reference frame (21), the telescopic direction of the output end of the moving cylinder (23) is parallel to the length direction of the reference frame (21), and the output end of the moving cylinder (23) is connected to the moving block (22).
3. The tunnel guide hole expansion equipment according to claim 2, characterized in that: The lifting assembly (3) comprises a lifting rod (31), a lifting slider (32), a lifting screw (33) and a lifting motor (34); the end of the reference frame (21) facing the machine body (1) is rotatably connected to the machine body (1), and the lifting rod (31) is rotatably arranged on the reference frame (21); the lifting slider (32) is slidably arranged on the machine body (1), and the end of the lifting rod (31) away from the reference frame (21) is rotatably connected to the lifting slider (32); the lifting screw (33) is rotatably arranged on the machine body (1), and the lifting motor (34) is arranged on the machine body (1) to drive the lifting screw (33) to rotate.
4. The tunnel guide hole expansion equipment according to claim 2, characterized in that: An extension frame (5) is arranged on the moving block (22); an extension block (51) is slidably arranged on the extension frame (5) along the length direction of the extension frame (5); and the spray gun (11) is arranged on the extension block (51); an extension assembly (6) is arranged on the extension frame (5) for driving the extension block (51) to slide along the length direction of the extension frame (5).
5. The tunnel guide hole expansion equipment according to claim 4, characterized in that: The extension assembly (6) comprises a traction rope (61), a traction ring (62), a reset rope (63) and a reset ring (64); the traction rope (61) is arranged on the side wall of the extension block (51) away from the reference frame (21); the traction ring (62) is arranged on one end of the extension frame (5) away from the reference frame (21); the end of the traction rope (61) away from the extension block (51) passes through the traction ring (62) and is connected to the end of the reference frame (21) facing the extension frame (5); the reset rope (63) is arranged on the side wall of the extension block (51) away from the traction rope (61); the reset ring (64) is arranged on the end of the extension frame (5) away from the traction ring (62); the end of the reset rope (63) away from the extension block (51) passes through the reset ring (64) and is connected to the end of the reference frame (21) facing the extension frame (5).
6. The tunnel guide hole expansion equipment according to claim 4, characterized in that: The adjusting assembly (4) comprises a mounting block (41), a rotating frame (42) and an adjusting motor (43); the mounting block (41) is arranged between the extension block (51) and the spray gun (11); the rotating frame (42) is rotatably arranged on the mounting block (41), and the rotating frame (42) is connected to the spray gun (11); and the adjusting motor (43) is arranged on the mounting block (41) to drive the rotating frame (42) to rotate.
7. The tunnel guide hole expansion equipment according to claim 6, characterized in that: The mounting block (41) is rotatably connected to the extension block (51), and a driving member (511) for driving the mounting block (41) to rotate is provided on the extension block (51).
8. The tunnel guide hole expansion equipment according to claim 1, characterized in that: An auxiliary support assembly (7) is provided at the end of the machine body (1) facing the spray gun (11) for auxiliary supporting the machine body (1).
9. The tunnel guide hole expansion equipment according to claim 8, characterized in that: The auxiliary support assembly (7) comprises a mounting rod (71), a pushing member (72), an auxiliary support block (73), an auxiliary support rod (74), a connecting block (75) and a connecting rod (76); the mounting rod (71) is arranged at the end of the machine body (1) facing the spray gun (11); the pushing member (72) is arranged inside the mounting rod (71); the auxiliary support block (73) is arranged at the output end of the pushing member (72); the pushing member (72) is used to drive the auxiliary support block (73) to move closer to or away from the ground; the auxiliary support rod (74) is rotatably arranged on the mounting rod (71) , and the auxiliary support rods (74) are distributed at intervals along the circumference of the auxiliary support rods (74); the connecting block (75) is slidably arranged on the mounting rod (71), the connecting block (75), the connecting rod (76) and the auxiliary support rod (74) are respectively arranged in a one-to-one correspondence, and the end of each auxiliary support rod (74) facing the mounting rod (71) is rotatably connected to the connecting block (75); the connecting rod (76) is rotatably arranged on each group of auxiliary support rods (74), and the end of each connecting rod (76) away from the auxiliary support rod (74) is rotatably connected to the auxiliary support block (73).
10. A method for expanding a tunnel guide hole according to any one of claims 1 to 9, characterized in that: The steps include: Pilot tunnel excavation: The excavator digs the pilot tunnel for earthwork; Adjusting the position: the moving component (2) moves the position of the spray gun (11), and the lifting component (3) moves the height of the spray gun (11), so as to move the spray gun (11) to the inside of the guide hole; Forming support: the adjustment component (4) adjusts the spraying direction of the spray gun (11); the spray gun (11) sprays concrete on the inner wall of the pilot tunnel, and adds a steel mesh, a steel arch frame and an anchor rod inside the pilot tunnel, and sprays concrete again to form support; Repeated operation: expand the guide tunnel section that forms the interior of the support again, and gradually repeat the above construction operations.