Temporary supporting device for tunnel construction

Abstract

The utility model provides a temporary supporting device for tunnel construction, and belongs to the technical field of tunnel construction. The multiple supporting pieces are arranged in the linear direction, every two adjacent supporting pieces are hinged to each other, and the hinged axial direction is perpendicular to the linear direction. Each supporting piece is provided with a through cavity, and every two adjacent through cavities communicate with each other. The air bag is inserted into the through cavities which communicate with one another, and the two ends of the air bag are inserted into the two through cavities located at the two ends correspondingly; when the air bag is inflated, the outer side face of the air bag can bulge to form a cambered surface structure matched with the radian of the inner circumferential face of the tunnel. And when the two supporting pieces located at the two ends are supported on the ground and the outer side face of the air bag is bulged to be of an arc surface structure, the arc surface structure supports the inner top face of each through cavity, so that the multiple supporting pieces located in the middle can form an arch structure used for being connected with a tunnel supporting face. According to the temporary supporting device for tunnel construction, the construction efficiency of tunnel temporary supporting can be improved.

Description

Technical Field

[0001] This utility model belongs to the field of tunnel construction technology, and more specifically, it relates to a temporary support device for tunnel construction. Background Technology

[0002] As a key component of transportation networks such as highways and railways, tunnel engineering is constantly increasing in scale and complexity. Temporary support, as a crucial link in tunnel construction, plays an important role in providing temporary support to the surrounding rock, controlling deformation, and ensuring construction safety before permanent support is formed. It is an indispensable safety guarantee in tunnel construction.

[0003] Currently, temporary support in tunnel construction mainly adopts a combination of on-site scaffolding and roof slab assembly. Specifically, construction workers need to measure and locate the tunnel according to its cross-sectional dimensions and inner wall conditions on-site, and then use manual labor or simple machinery to assemble steel pipes, structural steel, and other materials into a frame-type scaffolding. Steel plates or wooden boards are then laid on top of the scaffolding as a roof slab, forming a temporary support system for the tunnel's inner wall.

[0004] The inventors discovered that existing temporary support methods require multiple processes such as measurement, cutting, splicing, and fixing to be erected on-site, which is time-consuming and inefficient. Such problems not only delay the construction period and increase construction costs, but also directly exacerbate on-site operational risks and threaten the lives of construction workers. Utility Model Content

[0005] The purpose of this application is to provide a temporary support device for tunnel construction, so as to solve the technical problems of long construction time and low construction efficiency of temporary support in existing tunnel construction.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0007] A temporary support device for tunnel construction is provided, comprising:

[0008] Multiple support members are arranged along a straight line, and adjacent support members are hinged to each other, with the hinge axis perpendicular to the straight line; each support member has a through cavity, and adjacent through cavities are interconnected; and

[0009] An airbag is inserted into a plurality of interconnected cavities, with each end of the airbag inserted into two cavities located at both ends; when the airbag is inflated, the outer surface of the airbag can bulge into an arc-shaped structure that matches the curvature of the inner circumference of the tunnel.

[0010] Wherein, when the two support members at both ends are supported on the ground and the outer surface of the airbag bulges out as the arc-shaped structure, the arc-shaped structure supports the inner top surface of each cavity, so that the multiple support members in the middle can form an arched structure for connecting with the tunnel support surface.

[0011] In one possible implementation, the outer surface of each of the support members is curved;

[0012] When multiple support members constitute the arch structure, the outer surface of each support member is used to fit against the tunnel support surface.

[0013] In one possible implementation, a reserved hole is provided on the outer side of the support member, and a swing plate is hinged in the reserved hole;

[0014] When the outer surface of the airbag bulges out to form the arc structure and the outer surface of the support member is in contact with the tunnel support surface, part of the airbag is embedded in the reserved hole so that the swing plate swings to abut against or embed into the tunnel support surface.

[0015] In one possible implementation, the outer surface of the swing plate has anti-slip texture.

[0016] In one possible implementation, there is a snap-fit ​​structure between two adjacent support members;

[0017] When multiple support members constitute the arch structure, each set of the snap-fit ​​structure connects the corresponding two support members to limit the support members from swinging away from the tunnel support surface.

[0018] In one possible implementation, the snap-fit ​​structure includes:

[0019] A convex plate is disposed on the inner side of one of the support members;

[0020] Each of the support members has a protruding plate; and when multiple support members form the arch structure, each protruding plate abuts against one of the adjacent support members to limit the support member from swinging away from the tunnel support surface.

[0021] In one possible implementation, the snap-fit ​​structure further includes:

[0022] A groove is provided on the inner side of another of the support members;

[0023] The groove is adapted to allow the corresponding protrusion to be inserted, and the insertion end of the protrusion abuts against the bottom of the groove.

[0024] In one possible implementation, the airbag has an air nozzle communicating with its interior; the air nozzle passes through one of the supports and extends out for connection to an inflation device.

[0025] In one possible implementation, the expansion coefficient of the outer surface of the airbag is smaller than the expansion coefficient of the inner surface of the airbag.

[0026] In one possible implementation, the temporary support device further includes:

[0027] Two arch frames are respectively set on both sides of the arch structure to restrict the horizontal movement of the arch structure;

[0028] Each of the two arch frames has multiple limiting rods on adjacent sides, each corresponding to one of the multiple support members, and each limiting rod is used to abut against the inner surface of the corresponding support member.

[0029] In this embodiment, when temporary support is required for the tunnel excavation section, multiple support components are first arranged along a straight line and connected by hinges (the hinge axis is perpendicular to the straight line direction), allowing adjacent support components to rotate relative to each other. Then, airbags are inserted into multiple interconnected cavities, ensuring that the two ends of the airbags are fixed in the cavities of the first and last support components respectively. Subsequently, the airbags are inflated, and the outer surface of the airbags gradually bulges up, forming an arc-shaped structure that matches the curvature of the inner circumference of the tunnel. At this time, the first and last support components are supported on the ground, and the arc-shaped structure of the inflated airbags will push upwards against the inner top surface of each cavity, forcing the multiple support components in the middle to rotate around the hinge axis under the thrust, ultimately forming an arched structure that connects with the tunnel support surface, thus completing the temporary support.

[0030] Compared with the prior art, the temporary support device for tunnel construction provided in this application realizes flexible assembly and rapid forming of the temporary support structure through the cooperation of multiple support components connected by hinges and inflatable airbags. After inflation, the airbags can accurately fit the inner circumference of the tunnel, providing uniform support force and avoiding local stress concentration. At the same time, the multiple support components are connected to the airbags through the cavity, which simplifies the installation process and improves construction efficiency. Moreover, the arched structure can effectively disperse the pressure of the surrounding rock of the tunnel, enhancing the stability and safety of the temporary support. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1A three-dimensional structural diagram of the temporary support device for tunnel construction provided in the embodiments of this application. Figure 1 ;

[0033] Figure 2 A three-dimensional structural diagram of the temporary support device for tunnel construction provided in the embodiments of this application. Figure 2 ;

[0034] Figure 3 This is a front view structural diagram of a temporary support device for tunnel construction provided in an embodiment of this application;

[0035] Figure 4 for Figure 3 The diagram shows a cross-sectional view of a temporary support device used in tunnel construction.

[0036] Figure 5 This is a three-dimensional structural diagram of the support component used in the embodiments of this application;

[0037] The following are the labeling elements in the figure:

[0038] 1. Support components; 11. Through cavity; 12. Reserved hole; 2. Airbag; 21. Air nozzle; 3. Swing plate; 31. Anti-slip texture; 4. Snap-fit ​​structure; 41. Protruding plate; 42. Groove; 5. Arch frame; 51. Limiting rod; 6. Tunnel. Detailed Implementation

[0039] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0040] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0041] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0043] Please refer to the following: Figures 1 to 5 The temporary support device for tunnel construction provided in this application will now be described. The temporary support device for tunnel construction includes multiple support components 1 and airbags 2.

[0044] Multiple support components 1 are arranged along a straight line, and two adjacent support components 1 are hinged to each other, with the hinge axis perpendicular to the straight line direction; each support component 1 has a through cavity 11, and two adjacent through cavities 11 are interconnected.

[0045] The airbag 2 is inserted into multiple interconnected cavities 11, and the two ends of the airbag 2 are respectively inserted into two cavities 11 located at the two ends; when the airbag 2 is inflated, the outer surface of the airbag 2 can bulge into an arc surface structure that matches the curvature of the inner circumference of the tunnel 6.

[0046] By combining the articulated support component 1 with the inflatable airbag 2, the temporary support can be quickly assembled and precisely formed. After inflation, the airbag 2 fits the curvature of the tunnel 6, providing uniform support and avoiding localized stress concentration. The plug-in design of the cavity 11 and the airbag 2 simplifies the installation process and improves construction efficiency. The arched structure effectively disperses the surrounding rock pressure and enhances the stability of the support.

[0047] When the two support members 1 at both ends are supported on the ground and the outer side of the airbag 2 is bulging into an arc structure, the arc structure supports the inner top surface of each cavity 11 so that the multiple support members 1 in the middle can form an arch structure for connecting with the support face of the tunnel 6.

[0048] The number of support components 1 can be adjusted according to the span of tunnel 6. Airbags 2 can be made of elastic materials (such as high-strength rubber) to adapt to the temporary support needs under different geological conditions.

[0049] In this embodiment, when temporary support is needed for the excavation section of tunnel 6, multiple support components 1 are first arranged along a straight line and connected by hinges (the hinge axis is perpendicular to the straight line direction), so that adjacent support components 1 can rotate relative to each other; then, airbags 2 are inserted into multiple interconnected cavities 11, ensuring that the two ends of the airbags 2 are fixed in the cavities 11 of the first and last support components 1 respectively; then, the airbags 2 are inflated, and the outer surface of the airbags 2 gradually bulges up and forms an arc surface structure that matches the curvature of the inner circumference of tunnel 6; at this time, the first and last support components 1 are supported on the ground, and the bulging arc surface structure of the airbags 2 will push upward against the inner top surface of each cavity 11, forcing the multiple support components 1 located in the middle to rotate around the hinge axis under the action of thrust, and finally forming an arched structure that connects with the support surface of tunnel 6, thus completing the temporary support.

[0050] Compared with the prior art, the temporary support device for tunnel construction provided in this application achieves flexible assembly and rapid forming of the temporary support structure through the cooperation of multiple hinged support components 1 and inflatable airbags 2. After inflation, the airbags 2 can accurately fit the inner circumference of the tunnel 6, providing uniform support force and avoiding local stress concentration. At the same time, the multiple support components 1 are connected to the airbags 2 through the cavity 11, which simplifies the installation process and improves construction efficiency. Moreover, the arched structure can effectively disperse the surrounding rock pressure of the tunnel 6, enhancing the stability and safety of the temporary support.

[0051] In some embodiments, the support member 1 may be adopted as follows: Figures 1 to 5 The structure shown is described in the following document. Figures 1 to 5 Each support component 1 has an arc-shaped outer surface.

[0052] When multiple support members 1 form an arch structure, the outer surface of each support member 1 is used to fit against the support surface of the tunnel 6.

[0053] When multiple support components 1 form an arched structure, the arc surface of the outer side of each support component 1 directly contacts the support surface of the tunnel 6, forming a continuous contact support.

[0054] The outer surface parameters (such as radius and curvature) of the support component 1 can be customized according to the inner circumference curvature (such as circular or horseshoe-shaped) of different tunnels 6 to adapt to various tunnel types 6.

[0055] The curved surface design on the outer side of the support component 1 increases the contact area with the support surface of tunnel 6, avoids stress concentration caused by local point contact, and improves the fit between the support structure and tunnel 6 and the overall stability.

[0056] In some embodiments, the support member 1 may be adopted as follows: Figures 1 to 5 The structure shown is described in the following document. Figures 1 to 5 The outer side of the support component 1 is provided with a reserved hole 12, and a swing plate 3 is hinged in the reserved hole 12.

[0057] When the outer side of the airbag 2 bulges into an arc-shaped structure and the outer side of the support component 1 is attached to the tunnel 6 support surface, part of the airbag 2 is embedded in the reserved hole 12 so that the swing plate 3 swings to abut or embed into the tunnel 6 support surface.

[0058] When the airbag 2 is inflated and supports the top surface inside the cavity 11, part of the airbag 2 material is embedded in the reserved hole 12 on the outer side of the support component 1, which pushes the swing plate 3 hinged in the reserved hole 12 to swing outward, and finally makes the swing plate 3 abut against or embedded in the support surface of the tunnel 6.

[0059] The reserved hole 12 can be designed as an ellipse or a rectangle. The swing plate 3 can be made of elastic metal (such as spring steel) to enhance the swing flexibility and impact resistance. The support surface of the tunnel 6 can be pre-cut with a groove 42 matching the swing plate 3 so that the swing plate 3 can be embedded and the stability of the temporary support can be improved.

[0060] In some embodiments, the aforementioned swing plate 3 may be as follows: Figures 1 to 4 The structure shown is described in the following document. Figures 1 to 4 The outer surface of the swing plate 3 has anti-slip texture 31.

[0061] When the swing plate 3 abuts against or embeds into the support face of the tunnel 6, the anti-slip texture 31 on the outer side of the swing plate 3 contacts the surface of the tunnel 6, increasing the friction.

[0062] The anti-slip texture 31 can be in different forms such as cross-grid, wave, or serrated, or a wear-resistant coating (such as tungsten carbide) can be applied to the surface of the anti-slip texture 31 to extend its service life.

[0063] The anti-slip texture 31 on the swing plate 3 can prevent the swing plate 3 from sliding with the support surface of the tunnel 6 due to insufficient friction, especially in the damp or dusty environment of the tunnel 6, further improving the stability of the support structure.

[0064] In some embodiments, the support member 1 may be adopted as follows: Figures 1 to 5 The structure shown is illustrated in the figure. Figures 1 to 5 There is a snap-fit ​​structure 4 between two adjacent support components 1.

[0065] When multiple support components 1 form an arch structure, each set of interlocking structures 4 connects the corresponding two support components 1 to limit the swing of the support component 1 to detach from the support surface of the tunnel 6.

[0066] When the intermediate support member 1 forms an arched structure, the interlocking structure 4 (such as the convex plate 41 and the groove 42) between adjacent support members 1 cooperates with each other to restrict the support member 1 from swinging excessively around the hinge axis or from detaching from the support surface of the tunnel 6.

[0067] The snap-fit ​​structure 4 uses mechanical limiting to prevent the support component 1 from swinging unexpectedly due to the pressure of the airbag 2 or the deformation of the surrounding rock, ensuring the stability of the arch structure and reducing the risk of support failure during construction.

[0068] The snap-fit ​​structure 4 can also adopt a magnetic or elastic snap-fit ​​design, such as setting an elastic protrusion at the end of the convex plate 41 and setting a slot in the groove 42 to further enhance the reliability of the connection.

[0069] The snap-fit ​​structure 4 uses mechanical limiting to prevent the support component 1 from swinging unexpectedly due to the pressure of the airbag 2 or the deformation of the surrounding rock, ensuring the stability of the arch structure and reducing the risk of support failure during construction.

[0070] In some embodiments, the above-described snap-fit ​​structure 4 can be adopted as follows: Figures 1 to 5 The structure shown is described in the following document. Figures 1 to 5 The snap-fit ​​structure 4 includes a protruding plate 41.

[0071] The protruding plate 41 is disposed on the inner side of one of the support members 1.

[0072] Each support member 1 has a protruding plate 41; and when multiple support members 1 form an arch structure, each protruding plate 41 abuts against one of the adjacent support members 1 to limit the support member 1 from swinging away from the support surface of the tunnel 6.

[0073] The side of the convex plate 41 facing the tunnel 6 support face adopts an arc-shaped structure. When the convex plate 41 is connected to an adjacent support member 1, the arc surface on the convex plate 41 is suitable for fitting the side of the support member 1 facing away from the tunnel 6 support face.

[0074] The convex plate 41 can be designed as an adjustable length (such as a telescopic structure fixed by bolts) to adapt to different support member 1 spacing or tunnel 6 curvature changes.

[0075] The abutment design of the convex plate 41 is simple and easy to process. It restricts the swing direction through direct contact, eliminating the need for additional complex parts and reducing the manufacturing cost of the device.

[0076] In some embodiments, the above-described snap-fit ​​structure 4 can be adopted as follows: Figures 1 to 5 The structure shown is described in the following document. Figures 1 to 5 The snap-fit ​​structure 4 also includes a groove 42.

[0077] The groove 42 is provided on the inner side of another support member 1.

[0078] The groove 42 is adapted to allow the corresponding protrusion 41 to be inserted, and the inserted end of the protrusion 41 abuts against the bottom of the groove 42, thereby restricting the swing of the support member 1 through mechanical cooperation.

[0079] The groove 42 can be filled with elastic buffer material (such as rubber pads) to absorb part of the impact force when the convex plate 41 abuts against the bottom of the groove, thereby reducing the damage to the support component 1 caused by the vibration of the surrounding rock.

[0080] The fitting design of the protruding plate 41 and the groove 42 can accurately position the relative position of adjacent support members 1, avoiding sliding or misalignment caused by the protruding plate 41 only abutting the surface, and further improving the stability of the arch structure.

[0081] In some embodiments, the airbag 2 described above can be as follows: Figures 1 to 4 The structure shown is described in the following document. Figures 1 to 4 The airbag 2 has an air nozzle 21 communicating with its interior; the air nozzle 21 passes through one of the support members 1 and extends out for connection to an inflation device.

[0082] The airbag 2 is connected to the inflation device through the air nozzle 21. When inflated, gas enters the airbag 2 through the air nozzle 21, pushing the outer side of the airbag 2 to bulge and form an arc-shaped structure. After the support is completed, the airbag 2 is deflated through the air nozzle 21 and can be extracted from the cavity 11 for reuse.

[0083] The air nozzle 21 can be a quick connector (such as a clamp type or a threaded type), or a one-way valve can be added to the air nozzle 21 to prevent gas leakage during the inflation process.

[0084] The external design of the air nozzle 21 facilitates quick connection of the inflation equipment and shortens the molding time of the support structure; the airbag 2 can be recycled after deflation, reducing the cost of a single construction and improving the reusability of the device.

[0085] In some embodiments, the airbag 2 described above can be as follows: Figure 4 The structure shown is described in the following document. Figure 4 The expansion coefficient of the outer surface of airbag 2 is smaller than that of the inner surface of airbag 2.

[0086] When the airbag 2 is inflated, because the expansion coefficient of the outer side is smaller than that of the inner side, the inner side expands first and pushes the outer side to bulge into a preset arc structure, which matches the inner circumference of the tunnel 6, thus avoiding the airbag 2 from losing shape due to uneven expansion in all directions.

[0087] The outer surface of the airbag 2 can be made of a low elastic modulus material, while the inner surface can be made of a high elastic modulus material. Alternatively, the expansion coefficient can be differentiated through a layered composite process (such as an outer fiber layer).

[0088] By controlling the difference in the expansion coefficients of the inner and outer sides of the airbag 2, the shape of the airbag 2 after it inflates can be precisely controlled to ensure that it fits closely to the inner circumference of the tunnel 6 and improves the support efficiency.

[0089] In some embodiments, the aforementioned temporary support device may also employ, for example... Figure 1 The structure shown is described in the following document. Figure 1The temporary support structure also includes two arch frames 5.

[0090] Two arch frames 5 are respectively set on both sides of the arch structure to restrict the horizontal movement of the arch structure.

[0091] Among them, each of the two arch frames 5 has multiple limiting rods 51 on adjacent sides, which correspond one-to-one with multiple support members 1, and each limiting rod 51 is used to abut against the inner side of the corresponding support member 1.

[0092] After the arch structure is formed, arch frames 5 are installed on both sides. Multiple limiting rods 51 on the arch frames 5 abut against the inner side of the corresponding support member 1 to restrict the arch structure from moving in the horizontal direction (perpendicular to the tunnel 6 axis).

[0093] The limiting rod 51 can be designed with an adjustable length (such as a threaded rod + nut) to adapt to tunnels 6 of different widths; the arch frame 5 can adopt a detachable structure (such as bolt connection) to facilitate adjustment of the installation position according to the construction progress.

[0094] The design of the arch frame 5 and the limiting rod 51 prevents the arch structure from shifting due to the lateral pressure of the surrounding rock or construction vibration through lateral restraint, further enhancing the overall stability of the temporary support.

[0095] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A temporary support device for tunnel construction, characterized in that, include: Multiple support members are arranged along a straight line, and adjacent support members are hinged to each other, with the hinge axis perpendicular to the straight line; each support member has a through cavity, and adjacent through cavities are interconnected; and An airbag is inserted into a plurality of interconnected cavities, with each end of the airbag inserted into two cavities located at both ends; when the airbag is inflated, the outer surface of the airbag can bulge into an arc-shaped structure that matches the curvature of the inner circumference of the tunnel. Wherein, when the two support members at both ends are supported on the ground and the outer surface of the airbag bulges out as the arc-shaped structure, the arc-shaped structure supports the inner top surface of each cavity, so that the multiple support members in the middle can form an arched structure for connecting with the tunnel support surface.

2. The temporary support device for tunnel construction as described in claim 1, characterized in that, The outer surface of each of the aforementioned support members is curved. When multiple support members constitute the arch structure, the outer surface of each support member is used to fit against the tunnel support surface.

3. The temporary support device for tunnel construction as described in claim 2, characterized in that, The outer side of the support member is provided with a reserved hole, and a swing plate is hinged in the reserved hole; When the outer surface of the airbag bulges out to form the arc structure and the outer surface of the support member is in contact with the tunnel support surface, part of the airbag is embedded in the reserved hole so that the swing plate swings to abut against or embed into the tunnel support surface.

4. The temporary support device for tunnel construction as described in claim 3, characterized in that, The outer surface of the swing plate has anti-slip texture.

5. The temporary support device for tunnel construction as described in claim 1, characterized in that, There is a snap-fit ​​structure between two adjacent support members; When multiple support members constitute the arch structure, each set of the snap-fit ​​structure connects the corresponding two support members to limit the support members from swinging away from the tunnel support surface.

6. The temporary support device for tunnel construction as described in claim 5, characterized in that, The snap-fit ​​structure includes: A convex plate is disposed on the inner side of one of the support members; Each of the support members has a protruding plate; and when multiple support members form the arch structure, each protruding plate abuts against one of the adjacent support members to limit the support member from swinging away from the tunnel support surface.

7. The temporary support device for tunnel construction as described in claim 6, characterized in that, The snap-fit ​​structure also includes: A groove is provided on the inner side of another of the support members; The groove is adapted to allow the corresponding protrusion to be inserted, and the insertion end of the protrusion abuts against the bottom of the groove.

8. The temporary support device for tunnel construction as described in claim 1, characterized in that, The airbag has an air nozzle communicating with its interior; the air nozzle passes through one of the supports and extends out for connection to an inflation device.

9. The temporary support device for tunnel construction as described in claim 1, characterized in that, The expansion coefficient of the outer surface of the airbag is smaller than that of the inner surface of the airbag.

10. The temporary support device for tunnel construction as described in any one of claims 1-9, characterized in that, The temporary support device also includes: Two arch frames are respectively set on both sides of the arch structure to restrict the horizontal movement of the arch structure; Each of the two arch frames has multiple limiting rods on adjacent sides, each corresponding to one of the multiple support members, and each limiting rod is used to abut against the inner surface of the corresponding support member.

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