Tunnel anchor large-dip-angle main cable passing section bottom plate pressing die construction technology

Abstract

The invention discloses a tunnel anchor large-dip-angle main cable passing section bottom plate pressing die construction technology, and relates to the technical field of tunnel construction. The tunnel anchor large-dip-angle main cable passing section bottom plate pressing die construction technology comprises the following operation steps that S1, a back pressure support is installed; s2, a formwork is installed; s3, first mold concrete pouring; s4, removing the first mold template; s5, moving the template to a second template position; s6, mounting and pouring a second mold template; and S7, sliding and construction circulation are repeated. According to the tunnel anchor large-dip-angle main cable passing section bottom plate pressing mold construction technology, by adopting a pull-rod-free pressing mold design and utilizing a primary supporting arch frame to design a bottom plate pressing mold support, the formwork supporting requirement is met, the problem that a waterproof layer is damaged by a traditional pull rod system under a large dip angle is solved, meanwhile, the pressing mold system is provided with an adjusting lead screw, it is ensured that a formwork is accurately positioned, and the construction efficiency is improved. And by means of the overall sliding scheme of the formwork, continuous operation of concrete construction in a limited space is guaranteed, and the construction period is shortened.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel construction, in particular to a bottom plate die pressing construction process for a tunnel anchor large-angle main cable passing section. Background Art

[0002] The bottom plate press mold construction of the tunnel anchor main cable passage section with a large inclination angle is a complex and delicate project that needs to be carried out strictly in accordance with the process steps. However, the existing traditional tie rod system at large inclinations can easily damage the waterproof layer, and it is difficult to accurately position the formwork, making it difficult to ensure the quality of the concrete.

[0003] Therefore, in view of this, the existing structure and deficiencies were studied and improved, and a bottom plate pressing mold construction process for the tunnel anchor large-angle main cable passing section was proposed. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a bottom plate die pressing construction process for a tunnel anchor large-angle main cable passing section, which solves the problems raised in the above-mentioned background technology.

[0005] To achieve the above purpose, the present invention is implemented by the following technical scheme: a tunnel anchor large-angle main cable through section bottom plate die pressing construction process, comprising the following operating steps: S1. Installation of back pressure bracket: According to the construction design drawings, the back-pressure support is installed at the template support position. A self-checking structure is provided on the surface of the back-pressure support, through which the elevation and levelness of the back-pressure support are self-checked; S2. Template installation: The standardized steel formwork is hoisted to the construction site in modules. The formwork is assembled from one end to the other in sequence according to the formwork assembly order. The formwork is connected with a quick locking mechanism to ensure that the assembly seams are tight and without gaps. The height, position and inclination of the formwork are precisely adjusted using an adjustable screw. S3, first form concrete pouring: Mix concrete according to the designed mix ratio, and pour concrete in layers and sections from one end to the other. After pouring, cover and maintain to prevent early water loss of concrete. S4, removal of the first mold template: After the concrete strength of the first formwork reaches the design requirements, start to remove the two side wall formworks, adjust the screw rod to the minimum value, release the locking structure of the formwork, and use the lifting equipment to lift the formwork as a whole off the concrete surface; S5. The template moves to the second mold position: Install the sliding pad beam on the sliding path, ensure that the pad beam is flat and stable, adjust the position of the sliding pad beam to make it parallel to the sliding direction of the template, lower the template onto the sliding pad beam, and use the winch outside the tunnel to slide the template along the sliding pad beam to the second mold position; S6. Installation and pouring of the second mold formwork: Lift the sliding formwork to the specified elevation with a hoisting device, adjust the screw, align the formwork with the second formwork position, ensure that the contact surface between the formwork and the concrete fits seamlessly, use the adjustable screw to gradually adjust the horizontal, vertical and tilt angles of the formwork to ensure that they are consistent with the design requirements, and simultaneously remove the bracket of the first formwork and install it to the second formwork position; According to the first mold pouring method, pour concrete gradually from one end of the template. After pouring, smooth the concrete surface and cover it with water for curing; S7, Repeat the sliding and construction cycle: After the second mold concrete meets the standards, the mold is removed according to the first mold dismantling process, and then the sliding pad beam is installed, and the mold is slid to the third mold position. According to the above-mentioned process of mold installation, concrete pouring, mold removal and sliding, the construction of subsequent molds is completed in sequence.

[0006] Furthermore, in step S1, before the back-pressure support is installed, a conspicuous elevation line needs to be set inside the tunnel by spraying.

[0007] Furthermore, in step S2, the template is repeatedly checked by a total station and a laser rangefinder to ensure that the template is completely consistent with the designed position, and after the adjustment is completed, the screw rod is fixed to prevent the template from moving during the construction process.

[0008] Furthermore, in step S3, during the concrete pouring process, a vibrating rod is used to fully vibrate the concrete to ensure density and avoid the occurrence of bubbles and honeycomb defects.

[0009] Furthermore, in step S4, after the formwork is separated from the concrete surface, check whether there is any bonded concrete on the surface of the removed formwork, clean the formwork and re-apply the release agent, check whether the formwork connection parts and the supporting system are damaged, and repair or replace them in time.

[0010] Furthermore, in step S5, during the template sliding process, the template is manually checked at any time using an instrument to prevent tilting or jamming.

[0011] A tunnel anchor high-angle main cable passing section bottom plate die-casting construction process, wherein the back-pressure support used includes a support body, a self-inspection structure is arranged in the middle of the surface of the support body, and the self-inspection structure includes a track frame, a servo motor, a transmission screw, a movable sleeve, a one-way damping rotating shaft, a gear and a camera, a servo motor is fixed to the end of the track frame, and the output end of the servo motor is connected to the transmission screw, the outer wall of the transmission screw is sleeved with a movable sleeve, and the surface of the movable sleeve is rotatably connected to the one-way damping rotating shaft, the outer wall of the one-way damping rotating shaft is fixed with a gear, and the top of the one-way damping rotating shaft is fixed with a camera.

[0012] Furthermore, the transmission screw is located inside the track frame, and the movable sleeve is slidably connected to the track frame.

[0013] Furthermore, the self-inspection structure also includes a level, and the level is arranged on the top of the camera.

[0014] Furthermore, the self-checking structure also includes a one-way torsion spring shaft and a meshing single tooth. The outer side surface of one end of the track frame away from the servo motor is rotatably connected to the one-way torsion spring shaft, and the outer wall of the one-way torsion spring shaft is fixed with a meshing single tooth.

[0015] The present invention provides a bottom plate die pressing construction process for a tunnel anchor large-angle main cable passing section, which has the following beneficial effects: 1. The bottom plate press-form construction technology of the tunnel anchor large-angle main cable passing section adopts a rod-free press-form design and uses the initial support arch frame to design the bottom plate press-form bracket to meet the template support requirements and solve the problem of the traditional rod system damaging the waterproof layer under large inclination. At the same time, the press-form system is equipped with an adjustment screw to ensure the precise positioning of the template and the quality of the concrete. The overall sliding scheme of the template is used to ensure the continuous operation of the concrete construction in the limited construction space and save construction time.

[0016] 2. The tunnel anchor has a large-angle main cable through the bottom plate die-casting construction process. During the sliding process of the movable sleeve, the camera faces the tunnel side to collect the video image of the installation part at one end of the bracket body. The video image is transmitted remotely so that the inspection personnel can know the installation status of the bracket body remotely. During the movement of the camera, the level meter detects the level status of each part of the bracket body in real time and transmits it.

[0017] 3. The tunnel anchor high-angle main cable passes through the bottom plate die-casting construction process. When the servo motor drives the transmission screw to rotate in the opposite direction so that the movable sleeve seat moves toward the servo motor position, the meshing single tooth is stressed but the shaft does not rotate through the one-way torsion spring, and the gear generates thrust due to the meshing with the meshing single tooth to rotate through the one-way damping shaft, thereby carrying the camera to rotate 180 degrees so that its shooting direction faces the other side of the tunnel. Therefore, during the camera's return movement, the installation status of the other end of the bracket body is photographed and fed back, so that the inspectors do not need to carry a large number of instruments for inspection, which is conducive to greatly reducing the inspection workload of the inspectors. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall process structure of a bottom plate die pressing construction process of a tunnel anchor large-angle main cable passing section according to the present invention; Figure 2 It is a schematic diagram of the track frame structure of the present invention; Figure 3 It is a schematic diagram of the transmission screw structure of the present invention; Figure 4 It is a schematic diagram of the gear structure of the present invention; Figure 5 It is a schematic diagram of the gear and meshing single-tooth meshing transmission structure of the present invention.

[0019] In the figure: 1. bracket body; 2. self-checking structure; 201. track frame; 202. servo motor; 203. transmission screw; 204. movable sleeve; 205. one-way damping shaft; 206. gear; 207. camera; 208. level; 209. one-way torsion spring shaft; 210. meshing single tooth. DETAILED DESCRIPTION

[0020] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0021] like Figure 1 As shown, the present invention provides a technical solution: a tunnel anchor large-angle main cable through section bottom plate die pressing construction process, comprising the following operating steps: S1. Installation of back pressure bracket: According to the construction design drawings, the counter-pressure support is installed at the template support position. A self-checking structure is set on the surface of the counter-pressure support, and the elevation and horizontality behind the counter-pressure support are self-checked by the self-checking structure. Before the counter-pressure support is installed, a conspicuous elevation line and installation point need to be set inside the tunnel by spraying. S2. Template installation: The finalized steel formwork is hoisted to the construction site in modules. The formwork is assembled from one end to the other in sequence according to the formwork assembly order. The formwork is connected with a quick locking mechanism to ensure that the assembly seams are tight and seamless. The height, position and inclination of the formwork are precisely adjusted using an adjustable screw. The formwork is repeatedly tested with a total station and a laser rangefinder to ensure that the formwork is completely consistent with the designed position. After the adjustment is completed, the screw is fixed to prevent the formwork from moving during the construction process. S3, first form concrete pouring: Mix concrete according to the designed mix ratio, and pour concrete in layers and sections from one end to the other. After pouring, cover and maintain to prevent early water loss of concrete. During the concrete pouring process, use a vibrator to fully vibrate the concrete to ensure density and avoid bubbles and honeycomb defects; S4, removal of the first mold template: After the strength of the first formwork concrete reaches the design requirements, start to remove the two side wall formworks, adjust the screw to the minimum value, release the locking structure of the formwork, use the lifting equipment to lift the formwork as a whole off the concrete surface. After the formwork is off the concrete surface, check whether there is any bonded concrete on the surface of the removed formwork, clean the formwork and re-apply the release agent, check whether the formwork connection parts and support system are damaged, and repair or replace them in time; S5. The template moves to the second mold position: Install the sliding pad beam on the sliding path, ensure that the pad beam is flat and stable, adjust the position of the sliding pad beam to make it parallel to the sliding direction of the template, lower the template onto the sliding pad beam, and use the hoist outside the tunnel to slide the template along the sliding pad beam to the second mold position. During the template sliding process, manually use instruments to check the stability of the template at any time to prevent tilting or blocking; S6. Installation and pouring of the second mold formwork: Lift the sliding formwork to the specified elevation with a hoisting device, adjust the screw, align the formwork with the second formwork position, ensure that the contact surface between the formwork and the concrete fits seamlessly, use the adjustable screw to gradually adjust the horizontal, vertical and tilt angles of the formwork to ensure that they are consistent with the design requirements, and simultaneously remove the bracket of the first formwork and install it to the second formwork position; According to the first mold pouring method, pour concrete gradually from one end of the template. After pouring, smooth the concrete surface and cover it with water for curing; S7, Repeat the sliding and construction cycle: After the second formwork concrete reaches the standard, the formwork is removed according to the first formwork removal process, and then the sliding pad beam is installed, and the formwork is slid to the third formwork position. According to the above process of formwork installation, concrete pouring, formwork removal and sliding, the construction of subsequent forms is completed in sequence; Based on the above description, the present invention adopts a tie rod-free die-casting design and utilizes the initial support arch frame to design the bottom plate die-casting bracket to meet the formwork support requirements and solve the problem of traditional tie rod system damaging the waterproof layer under large inclination angles. At the same time, the die-casting system is provided with an adjusting screw to ensure the precise positioning of the formwork and the quality of concrete. The overall sliding scheme of the formwork is used to ensure continuous operation of concrete construction in limited spaces and save construction time.

[0022] like Figure 2-Figure 5As shown, a tunnel anchor large-angle main cable through section bottom plate die pressing construction process, wherein the back pressure support used includes a support body 1, a self-checking structure 2 is arranged in the middle of the surface of the support body 1, and the self-checking structure 2 includes a track frame 201, a servo motor 202, a transmission screw 203, a movable sleeve seat 204, a one-way damping shaft 205, a gear 206 and a camera 207, a servo motor 202 is fixed to the end of the track frame 201, and the output end of the servo motor 202 is connected to the transmission screw 203, the outer wall of the transmission screw 203 is provided with a movable sleeve seat 204, and the surface of the movable sleeve seat 204 is rotatably connected to the one-way damping shaft 205. A one-way damping shaft 205, a gear 206 is fixed on the outer wall of the one-way damping shaft 205, and a camera 207 is fixed on the top of the one-way damping shaft 205, the transmission screw 203 is located inside the track frame 201, and the movable sleeve 204 is slidably connected to the track frame 201, the self-inspection structure 2 also includes a level 208, and a level 208 is arranged on the top of the camera 207, the self-inspection structure 2 also includes a one-way torsion spring shaft 209 and a meshing single tooth 210, the outer side surface of one end of the track frame 201 away from the servo motor 202 is rotatably connected to the one-way torsion spring shaft 209, and the outer wall of the one-way torsion spring shaft 209 is fixed with a meshing single tooth 210; The specific operation is as follows: when the back-pressure bracket is installed, the elevation line and installation point are pre-set inside the tunnel so that the bracket body 1 can be accurately installed to the specified position. After installation, the servo motor 202 drives the transmission screw 203 to rotate so that the movable sleeve 204 slides along the inside of the track frame 201. During the sliding process of the movable sleeve 204, the camera 207 faces one side of the tunnel to collect the video picture of the installation part of one end of the bracket body 1. The video picture is transmitted remotely so that the inspection personnel can remotely know the installation status of the bracket body 1. During the movement of the camera 207, the level meter 208 detects the level status of each part of the bracket body 1 in real time and also transmits it; When the camera 207 slides to the end of the track frame 201 away from the servo motor 202, the gear 206 will contact the meshing single tooth 210. Under the action of movement, the gear 206 does not rotate through the one-way damping shaft 205, while the meshing single tooth 210 rotates through the one-way torsion spring shaft 209 under the action of force, so that the gear 206 carries the camera 207 through the area where the meshing single tooth 210 is located; When the servo motor 202 drives the transmission screw 203 to rotate in the opposite direction so that the movable sleeve 204 moves toward the position of the servo motor 202, the meshing single tooth 210 is stressed but does not rotate through the one-way torsion spring shaft 209, and the gear 206 generates thrust due to the meshing with the meshing single tooth 210 to rotate through the one-way damping shaft 205, thereby driving the camera 207 to rotate. When the camera 207 passes through the area where the meshing single tooth 210 is located and moves toward the position of the servo motor 202, the camera 207 rotates 180 degrees so that its shooting direction is toward the other side of the tunnel. Therefore, during the return movement of the camera 207, the installation status of the other end of the bracket body 1 is photographed and fed back, thereby eliminating the need for inspectors to carry a large number of instruments for inspection, which is beneficial to greatly reduce the inspection workload of inspectors.

[0023] In summary, when using the bottom plate die-casting construction process of the tunnel anchor large-angle main cable through section, first install the counter-pressure bracket at the template support position according to the construction design drawings; The standardized steel formwork is hoisted to the construction site in modules. The formwork is assembled from one end to the other in the order of formwork assembly. The formwork is connected by a quick locking mechanism to ensure that the assembly seams are tight and seamless. The height, position and inclination of the formwork are precisely adjusted using an adjustable screw. Concrete is mixed according to the designed mix ratio, and concrete is poured in layers and sections from one end to the other. After pouring, it is covered and maintained to prevent early water loss of the concrete. During the concrete pouring process, the concrete is fully vibrated with a vibrating rod to ensure density and avoid bubbles and honeycomb defects. After the strength of the first mold concrete reaches the design requirements, the two side wall formworks are removed, the screw is adjusted to the minimum value, the locking structure of the formwork is released, and the hoisting equipment is used to lift the formwork as a whole off the concrete surface. The sliding pad beam is installed on the sliding path to ensure that the pad beam is flat and stable. The position of the sliding pad beam is adjusted to make it parallel to the sliding direction of the formwork. The formwork is lowered onto the sliding pad beam, and the winch outside the tunnel is used to slide the formwork along the sliding pad beam to the second mold position. The template after sliding is lifted to the specified elevation by hoisting equipment, the screw is adjusted, and the template is aligned with the second mold position to ensure that the contact surface between the template and the concrete fits seamlessly. The horizontal, vertical and tilt angles of the template are gradually adjusted using the adjustable screw to ensure that they are consistent with the design requirements. The bracket of the first mold is removed simultaneously and installed to the second mold position. Concrete is gradually poured from one end of the template according to the first mold pouring method. After pouring, the concrete surface is smoothed and covered with water for curing. After the second mold concrete meets the standards, the template is removed according to the first mold removal process, and then the sliding pad beam is installed. The template is slid to the third mold position. According to the above process of template installation, concrete pouring, template removal and sliding, the construction of subsequent molds is completed in sequence. When the counter-pressure support is installed, the elevation line and installation point are pre-set inside the tunnel so that the support body 1 can be accurately installed to the specified position. After installation, the servo motor 202 drives the transmission screw 203 to rotate so that the movable sleeve 204 slides along the inside of the track frame 201. During the sliding of the movable sleeve 204, the camera 207 faces one side of the tunnel to collect the video picture of the installation part of one end of the support body 1. The video picture is transmitted remotely so that the inspection personnel can remotely know the installation status of the support body 1. During the movement of the camera 207, the level meter 208 detects the horizontal status of each part of the support body 1 in real time and also transmits it. When the camera 207 slides to the end of the track frame 201 away from the servo motor 202, the gear 206 will contact the meshing single tooth 210. Under the action of movement, the gear 206 does not rotate through the one-way damping shaft 205, while the meshing single tooth 210 rotates through the one-way torsion spring shaft 209 under the action of force, so that the gear 206 carries the camera 207 through the area where the meshing single tooth 210 is located; When the servo motor 202 drives the transmission screw 203 to rotate in the opposite direction so that the movable sleeve 204 moves toward the position of the servo motor 202, the meshing single tooth 210 is stressed but does not rotate through the one-way torsion spring shaft 209, and the gear 206 generates thrust due to the meshing with the meshing single tooth 210 to rotate through the one-way damping shaft 205, thereby carrying the camera 207 to rotate. When the camera 207 passes through the area where the meshing single tooth 210 is located and moves toward the position of the servo motor 202, the camera 207 rotates 180 degrees so that its shooting direction is toward the other side of the tunnel, thereby photographing and feeding back the installation status of the other end of the bracket body 1 during the return movement of the camera 207.

[0024] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A tunnel anchor large-angle main cable through section bottom plate die pressing construction process, characterized in that: The following steps are included: S1. Installation of back pressure bracket: According to the construction design drawings, the back-pressure support is installed at the template support position. A self-checking structure is provided on the surface of the back-pressure support, and the elevation and levelness of the back-pressure support are self-checked by the self-checking structure. S2. Template installation: The standardized steel formwork is hoisted to the construction site in modules. The formwork is assembled from one end to the other in sequence according to the formwork assembly order. The formwork is connected with a quick locking mechanism to ensure that the assembly seams are tight and without gaps. The height, position and inclination of the formwork are precisely adjusted using an adjustable screw. S3, first form concrete pouring: Mix concrete according to the designed mix ratio, and pour concrete in layers and sections from one end to the other. After pouring, cover and maintain to prevent early water loss of concrete. S4, removal of the first mold template: After the concrete strength of the first formwork reaches the design requirements, start to remove the two side wall formworks, adjust the screw rod to the minimum value, release the locking structure of the formwork, and use the lifting equipment to lift the formwork as a whole off the concrete surface; S5. The template moves to the second mold position: Install the sliding pad beam on the sliding path, ensure that the pad beam is flat and stable, adjust the position of the sliding pad beam to make it parallel to the sliding direction of the template, lower the template onto the sliding pad beam, and use the winch outside the tunnel to slide the template along the sliding pad beam to the second mold position; S6. Installation and pouring of the second mold formwork: Lift the sliding formwork to the specified elevation with a hoisting device, adjust the screw, align the formwork with the second formwork position, ensure that the contact surface between the formwork and the concrete fits seamlessly, use the adjustable screw to gradually adjust the horizontal, vertical and tilt angles of the formwork to ensure that they are consistent with the design requirements, and simultaneously remove the bracket of the first formwork and install it to the second formwork position; According to the first mold pouring method, pour concrete gradually from one end of the template. After pouring, smooth the concrete surface and cover it with water for curing; S7, Repeat the sliding and construction cycle: After the second mold concrete meets the standards, the mold is removed according to the first mold dismantling process, and then the sliding pad beam is installed, and the mold is slid to the third mold position. According to the above-mentioned process of mold installation, concrete pouring, mold removal and sliding, the construction of subsequent molds is completed in sequence.

2. The bottom plate die pressing construction process for the tunnel anchor high-angle main cable passage section according to claim 1 is characterized by: In step S1, before the back-pressure support is installed, a conspicuous elevation line needs to be set inside the tunnel by spraying.

3. The bottom plate die pressing construction process for the tunnel anchor high-angle main cable passage section according to claim 1 is characterized by: In step S2, the template is repeatedly checked by a total station and a laser distance measuring instrument to ensure that the template is completely consistent with the designed position, and after the adjustment is completed, the screw rod is fixed to prevent the template from moving during the construction process.

4. The bottom plate die pressing construction process for the tunnel anchor high-angle main cable passage section according to claim 1 is characterized by: In step S3, during the concrete pouring process, a vibrating rod is used to fully vibrate the concrete to ensure density and avoid bubbles and honeycomb defects.

5. The bottom plate die pressing construction process for the tunnel anchor high-angle main cable passage section according to claim 1 is characterized by: In step S4, after the formwork is separated from the concrete surface, check whether there is any bonded concrete on the removed formwork surface, clean the formwork and re-apply the release agent, check whether the formwork connection parts and the support system are damaged, and repair or replace them in time.

6. The bottom plate die pressing construction process for the tunnel anchor high-angle main cable passage section according to claim 1 is characterized by: In step S5, during the template sliding process, the template is manually checked at any time using an instrument to prevent tilting or jamming.

7. According to the bottom plate die-casting construction process of the tunnel anchor high-angle main cable passing section according to claim 1, the back-pressure support used comprises a support body (1), characterized in that: A self-checking structure (2) is provided in the middle of the surface of the support body (1), and the self-checking structure (2) comprises a track frame (201), a servo motor (202), a transmission screw (203), a movable sleeve (204), a one-way damping rotating shaft (205), a gear (206) and a camera (207); the servo motor (202) is fixed to the end of the track frame (201), and the output end of the servo motor (202) is connected to the transmission screw (203); the outer wall of the transmission screw (203) is sleeved with a movable sleeve (204), and the surface of the movable sleeve (204) is rotatably connected to the one-way damping rotating shaft (205); the outer wall of the one-way damping rotating shaft (205) is fixed with a gear (206), and the top of the one-way damping rotating shaft (205) is fixed with a camera (207).

8. The bottom plate die pressing construction process for the tunnel anchor high-angle main cable passage section according to claim 7 is characterized by: The transmission screw rod (203) is located inside the track frame (201), and the movable sleeve seat (204) is slidably connected to the track frame (201).

9. The bottom plate die pressing construction process for the tunnel anchor high-angle main cable passage section according to claim 7 is characterized by: The self-inspection structure (2) further comprises a level (208), and the level (208) is arranged on the top of the camera (207).

10. The bottom plate die pressing construction process for the tunnel anchor high-angle main cable passage section according to claim 7, characterized in that: The self-checking structure (2) further comprises a one-way torsion spring shaft (209) and a meshing single tooth (210); the outer side surface of one end of the track frame (201) away from the servo motor (202) is rotatably connected to the one-way torsion spring shaft (209), and the meshing single tooth (210) is fixed to the outer wall of the one-way torsion spring shaft (209).

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