Pile-arch protection structure suitable for multi-arch tunnel in bealock section

Abstract

The utility model relates to the technical field of tunnel engineering, and provides a pile-protective arch structure suitable for a multi-arch tunnel in a bealock section, which comprises a pre-reinforcing pile assembly and a protective arch, the pre-reinforcing pile assembly comprises a first pre-reinforcing pile assembly arranged on the outer side of a left line of the tunnel and a second pre-reinforcing pile assembly arranged on the outer side of a right line of the tunnel, the bottom of the first pre-reinforcing pile assembly and the bottom of the second pre-reinforcing pile assembly both extend downwards to the position below the tunnel arch bottom, and the protection arch is connected between the first pre-reinforcing pile assembly and the second pre-reinforcing pile assembly and arranged above a tunnel left line and a tunnel right line. Vertical and horizontal surrounding rock pressure can be effectively resisted, synchronous construction of the left main hole and the right main hole of the multi-arch tunnel can be achieved, the multi-arch tunnel construction procedures are greatly reduced, the multi-arch tunnel construction speed and convenience are improved, tunnel construction safety is guaranteed, meanwhile, the excavation volume of the side slope and the front slope can be greatly reduced, and the concept of green and environment-friendly tunnel excavation is embodied.

Description

Technical Field

[0001] This utility model relates to the field of tunnel engineering technology, and in particular to a pile-arch support structure suitable for multi-arch tunnels in mountain pass sections. Background Technology

[0002] Today, arch tunnels are often used in highway projects with limited land use due to their advantage of requiring less land. However, due to terrain and route selection constraints, the tunnel entrances are inevitably located in geologically challenging areas such as mountain passes. In existing technologies, large-span arch tunnels in mountain pass areas are usually constructed using either open-cut tunnels or backfilling and tunneling methods.

[0003] Among them, the open-cut method is to excavate the mountain within the tunnel area by gently cutting the slope. Since the mountains on both sides of the pass are steep and the side slopes are often high, this method requires the use of pile slab walls and anchor frame beams to reinforce the high slopes. The backfilling tunneling method involves directly backfilling soil in the pass area to ensure that the tunnel is covered with soil. After the tunnel is reinforced by long pipe roofs and radial grouting, it is then excavated.

[0004] Numerous engineering examples demonstrate that the open-cut tunnel approach involves extensive excavation during construction, causing significant damage to the original mountain and ecosystem, and posing extremely high risks to slope protection during construction and operation. The backfill-and-cut tunnel approach, which artificially modifies the existing terrain, is limited by the construction site and adverse geological conditions in valley areas, making it difficult to guarantee the effectiveness of backfill compaction. Practice has shown that tunnel collapses and roof falls are common occurrences during construction, and lining cracking is frequent during later construction and operation.

[0005] Therefore, it is necessary to propose a pile-arch support structure suitable for arch tunnels in mountain pass areas to solve or at least alleviate the above-mentioned defects. Utility Model Content

[0006] The main purpose of this utility model is to provide a pile-arch protection structure suitable for arch tunnels in mountain pass areas, so as to solve the technical problems in the prior art where the open-cut method is required for large-span arch tunnels in mountain pass areas, and the direct backfilling tunneling method is difficult to guarantee the safety of the tunnel structure.

[0007] To achieve the above objectives, this utility model provides a pile-arch support structure suitable for arch tunnels in mountain pass sections, comprising a pre-reinforced pile assembly and an arch support, wherein,

[0008] The pre-reinforced pile assembly includes a first pre-reinforced pile assembly located on the outer side of the left line of the tunnel and a second pre-reinforced pile assembly located on the outer side of the right line of the tunnel. The second pre-reinforced pile assembly and the first pre-reinforced pile assembly are arranged in a one-to-one correspondence. The bottom of the first pre-reinforced pile assembly and the second pre-reinforced pile assembly both extend downward to below the tunnel arch bottom, and the top of the first pre-reinforced pile assembly and the second pre-reinforced pile assembly both extend upward to above the tunnel arch top.

[0009] The protective arch is connected between the first pre-reinforced pile assembly and the second pre-reinforced pile assembly, and the protective arch is located above the left line and the right line of the tunnel.

[0010] Preferably, the arch support comprises a first connecting section, a first arched section, a second connecting section, a second arched section, and a third connecting section that are sequentially connected along the transverse direction of the tunnel, wherein,

[0011] The first connecting segment is connected to the first pre-reinforced pile assembly. The shape of the first arched segment matches the shape of the left tunnel line and is located at the top of the left tunnel line. The second connecting segment overlaps the top of the central partition wall. The shape of the second arched segment matches the shape of the right tunnel line and is located at the top of the right tunnel line. The third connecting segment is connected to the second pre-reinforced pile assembly.

[0012] Preferably, the first pre-reinforced pile assembly includes multiple first pre-reinforced piles arranged at intervals along the tunnel extension direction. Each first pre-reinforced pile has a first connecting bracket on the side near the arch, the first connecting section is connected to the first connecting bracket, and the bottom of each first pre-reinforced pile extends downward to 5m below the arch bottom of the left tunnel line.

[0013] Preferably, the second pre-reinforced pile assembly includes multiple second pre-reinforced piles arranged at intervals along the tunnel extension direction. Each second pre-reinforced pile is provided with a second connecting bracket on the side near the arch. The third connecting section is connected to the second connecting bracket. The bottom of each second pre-reinforced pile extends downward to 5m below the arch bottom of the right tunnel line.

[0014] Preferably, the first connecting segment is connected to the first pre-reinforced pile via a first rebar assembly, and the second connecting segment is connected to the second pre-reinforced pile via a second rebar assembly; wherein, the first rebar assembly includes multiple first transverse rebars arranged at vertical intervals, and the second rebar assembly includes multiple second transverse rebars arranged at vertical intervals.

[0015] Preferably, the arch support includes an arch support concrete structure, an I-beam arch frame embedded in the arch support concrete structure, and a first connecting steel plate and a second connecting steel plate respectively connected to both ends of the I-beam arch frame. The first connecting steel plate and the second connecting steel plate are respectively exposed at the ends of the arch support concrete structure. The first connecting steel plate is connected to the first connecting bracket, and the second connecting steel plate is connected to the second connecting bracket.

[0016] Preferably, a third connecting steel plate corresponding to the first connecting steel plate is pre-embedded in the outer wall of the first connecting bracket, and the first connecting steel plate and the third connecting steel plate are connected.

[0017] Preferably, a fourth connecting steel plate corresponding to the second connecting steel plate is pre-embedded in the outer wall of the second connecting bracket, and the second connecting steel plate and the fourth connecting steel plate are connected.

[0018] Preferably, the thickness of the protective arch is set between 80cm and 100cm.

[0019] Preferably, the cross-sections of the first pre-reinforced pile and the second pre-reinforced pile are both rectangular, with cross-sectional dimensions of 3m*2m.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] This application can effectively resist vertical and horizontal rock pressure, enabling the simultaneous construction of the left and right main tunnels of the continuous arch tunnel, greatly reducing the construction procedures of the continuous arch tunnel, improving the construction speed and convenience of the continuous arch tunnel, ensuring the safety of tunnel construction, and at the same time significantly reducing the excavation of the side slopes, eliminating the need for large-scale excavation as in the open-cut scheme, thus embodying the concept of green and environmentally friendly tunnel excavation.

[0022] Specifically, this application sets up a first pre-reinforced pile assembly on the outer side of the left tunnel and a second pre-reinforced pile assembly on the outer side of the right tunnel. The first and second pre-reinforced pile assemblies reinforce and protect the steep mountainsides on both sides of the mountain pass, resisting the eccentric pressure from the mountainsides and ensuring uniform and balanced horizontal stress on the tunnel structure. The tunnel roof adopts a fully enclosed upper arch, connected to the corresponding pre-reinforced pile assemblies on both sides to form a whole, effectively resisting unbalanced earth pressure from above and ensuring uniform and balanced vertical stress on the tunnel structure. Simultaneously, the arch serves as the lateral support for the pre-reinforced pile assemblies, bearing part of the horizontal load and forming a combined load-bearing system. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, 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 utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is an application scenario diagram of the overall structure in one embodiment of the present utility model;

[0025] Figure 2 This is a schematic diagram of the connection between the pre-reinforced pile assembly and the protective arch in one embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram showing the connection between the third connecting steel plate and the first connecting steel plate in one embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the protective arch in one embodiment of the present invention.

[0028] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0029] Explanation of icon numbers:

[0030] 10. Pre-reinforced pile assembly; 110. First pre-reinforced pile assembly; 111. First pre-reinforced pile; 112. First connecting corbel; 113. First transverse reinforcement; 114. Third connecting steel plate; 120. Second pre-reinforced pile assembly; 121. Second pre-reinforced pile; 122. Second connecting corbel; 123. Second transverse reinforcement; 20. Arch support; 210. First connecting section; 220. First arch section; 230. Second connecting section; 240. Second arch section; 250. Third connecting section; 260. Arch support concrete structure; 270. I-beam arch frame; 280. First connecting steel plate; 30. Left tunnel line; 40. Right tunnel line; 50. Central partition wall; 60. Steel pipe. Detailed Implementation

[0031] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0034] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0035] Please see the appendix Figures 1 to 4 The present invention provides a pile-arch support structure suitable for arch tunnels in mountain pass sections, comprising a pre-reinforced pile assembly 10 and an arch support 20, wherein...

[0036] The pre-reinforced pile assembly 10 includes a first pre-reinforced pile assembly 110 located outside the left tunnel line 30 and a second pre-reinforced pile assembly 120 located outside the right tunnel line 40. The second pre-reinforced pile assembly 120 and the first pre-reinforced pile assembly 110 are arranged in a one-to-one correspondence. The bottoms of the first pre-reinforced pile assembly 110 and the second pre-reinforced pile assembly 120 extend downward to below the tunnel arch bottom, and the tops of the first pre-reinforced pile assembly 110 and the second pre-reinforced pile assembly 120 extend upward to above the tunnel arch top. Preferably, the first pre-reinforced pile assembly 110 is located 1m from the excavation outline of the left tunnel line 30, and the second pre-reinforced pile assembly 120 is located 1m from the excavation outline of the right tunnel line 40.

[0037] The protective arch 20 is connected between the first pre-reinforced pile assembly 110 and the second pre-reinforced pile assembly 120, and the protective arch 20 is located above the left tunnel line 30 and the right tunnel line 40.

[0038] Specifically, in geography, a mountain pass refers to a narrow, flat, and relatively low area between two mountains, specifically a saddle-shaped pass on a high mountain ridge. This application installs a first pre-reinforced pile assembly 110 on the outer side of the left tunnel line 30 and a second pre-reinforced pile assembly 120 on the outer side of the right tunnel line 40. The first and second pre-reinforced pile assemblies 110 and 120 reinforce and protect the steep mountainsides on both sides of the mountain pass, resisting the eccentric pressure from the mountainsides and ensuring a uniform and balanced horizontal force on the tunnel structure. The tunnel roof uses an upper fully enclosed arch 20, which connects to the corresponding pre-reinforced pile assemblies 10 on both sides to form a whole, effectively resisting unbalanced earth pressure from above and ensuring a uniform and balanced vertical force on the tunnel structure. Simultaneously, the arch 20 serves as a lateral support for the pre-reinforced pile assemblies 10, bearing part of the horizontal load and forming a combined load-bearing system.

[0039] In this application, by setting pre-reinforced pile components 10 on both sides of the tunnel and setting arch protection 20 on the top of the tunnel, the vertical and horizontal surrounding rock pressure can be effectively resisted, enabling the left and right main tunnels of the continuous arch tunnel to be constructed simultaneously, greatly reducing the construction procedures of the continuous arch tunnel, improving the construction speed and convenience of the continuous arch tunnel, and ensuring the safety of tunnel construction; at the same time, by adopting the structure of this application, the excavation volume of the side slope can be significantly reduced, reflecting the concept of green and environmentally friendly tunnel excavation.

[0040] As a preferred embodiment, such as Figure 2 As shown, the protective arch 20 includes a first connecting section 210, a first arched section 220, a second connecting section 230, a second arched section 240, and a third connecting section 250 that are sequentially connected along the transverse direction of the tunnel.

[0041] The first connecting segment 210 is connected to the first pre-reinforced pile assembly 110. The shape of the first arched segment 220 matches the shape of the left tunnel line 30 and is located at the top of the left tunnel line 30. The second connecting segment 230 overlaps the top of the central partition wall 50. The shape of the second arched segment 240 matches the shape of the right tunnel line 40 and is located at the top of the right tunnel line 40. The third connecting segment 250 is connected to the second pre-reinforced pile assembly 120.

[0042] Specifically, the first connecting section 210 is connected to the first pre-reinforced pile assembly 110, and the third connecting section 250 is connected to the second pre-reinforced pile assembly 120, thereby forming a complete stress system, which improves the overall structural strength. The surrounding soil or rock load can be effectively transferred to the stratum through the arch 20 and the pre-reinforced pile assembly 10, optimizing the load transfer path and improving the structure's bearing capacity.

[0043] In a preferred embodiment, the first pre-reinforced pile assembly 110 includes a plurality of first pre-reinforced piles 111 arranged at intervals along the tunnel extension direction. Each first pre-reinforced pile 111 is provided with a first connecting bracket 112 on the side near the arch 20. The first connecting section 210 and the first connecting bracket 112 are connected. The bottom of each first pre-reinforced pile 111 extends downward to 5m below the arch bottom of the left tunnel 30.

[0044] Specifically, the first pre-reinforced pile assembly 110 includes multiple first pre-reinforced piles 111 arranged at intervals along the tunnel extension direction. Preferably, the interval between two adjacent first pre-reinforced piles 111 is 5m. The first pre-reinforced piles 111 penetrate 5 meters below the arch bottom of the left tunnel 30. The top of the first pre-reinforced piles 111 is flush with the ground surface, effectively fixing the soil or rock around the tunnel, effectively enhancing the stability of the tunnel structure, and preventing soil or rock slippage and collapse caused by tunnel excavation.

[0045] Each first pre-reinforced pile 111 has a first connecting bracket 112 on the side near the arch 20. The first connecting bracket 112 is connected to the first connecting section 210 of the arch 20, so that the load around the tunnel can be effectively transferred to the first pre-reinforced pile 111 through the arch 20 and the first connecting bracket 112, and then distributed into the stratum. This optimizes the load transfer path, improves the bearing capacity of the structure, and reduces the stress concentration on the tunnel structure.

[0046] In another preferred embodiment, the second pre-reinforced pile assembly 120 includes a plurality of second pre-reinforced piles 121 arranged at intervals along the tunnel extension direction. Each second pre-reinforced pile 121 is provided with a second connecting bracket 122 on the side near the arch support 20. The third connecting section 250 is connected to the second connecting bracket 122. The bottom of each second pre-reinforced pile 121 extends downward to 5m below the arch bottom of the right tunnel line 40.

[0047] Specifically, the second pre-reinforced pile assembly 120 includes multiple second pre-reinforced piles 121 arranged at intervals along the tunnel extension direction. The second pre-reinforced piles 121 extend 5 meters below the arch bottom of the right tunnel 40, effectively fixing the soil or rock mass around the tunnel, effectively enhancing the stability of the tunnel structure, and preventing soil or rock mass slippage and collapse caused by tunnel excavation.

[0048] Each second pre-reinforced pile 121 has a second connecting bracket 122 on the side near the arch 20. The second connecting bracket 122 is connected to the first connecting section 210 of the arch 20, so that the load around the tunnel can be effectively transferred to the first pre-reinforced pile 111 through the arch 20 and the first connecting bracket 112, and then distributed into the stratum. This optimizes the load transfer path, improves the bearing capacity of the structure, and reduces the stress concentration on the tunnel structure.

[0049] Furthermore, the first connecting segment 210 is connected to the first pre-reinforced pile 111 via a first rebar assembly (not shown in the figure), and the second connecting segment 230 is connected to the second pre-reinforced pile 121 via a second rebar assembly (not shown in the figure); wherein, the first rebar assembly includes a plurality of first transverse steel bars 113 arranged at intervals along the vertical direction, and the second rebar assembly includes a plurality of second transverse steel bars 123 arranged at intervals along the vertical direction.

[0050] Specifically, the first and second rebar assemblies, respectively, use multiple first and second transverse rebars 113 and 123 arranged vertically at intervals to securely connect the first connecting section 210 and the second connecting section 230 to the first pre-reinforced pile 111 and the second pre-reinforced pile 121. This enhances the strength of the structural connection and ensures the overall stability and safety of the tunnel structure. Preferably, the first and second transverse rebars 113 and 123 are made of φ22 steel bars, 1m in length, and spaced 0.2m x 1m apart, ensuring the overall stability of the arch support.

[0051] In a preferred embodiment, the arch support 20 includes an arch support concrete structure 260, an I-beam arch frame 270 embedded inside the arch support concrete structure 260, and a first connecting steel plate 280 and a second connecting steel plate (not shown) respectively connected to both ends of the I-beam arch frame 270. The first connecting steel plate 280 and the second connecting steel plate are respectively exposed at the ends of the arch support concrete structure 260. The first connecting steel plate 280 is connected to the first connecting bracket 112, and the second connecting steel plate is connected to the second connecting bracket 122.

[0052] Specifically, the arch support 20 includes an arch support concrete structure 260, a pre-embedded I-beam arch frame 270, and a first connecting steel plate 280 and a second connecting steel plate connected to both ends of the I-beam arch frame 270. In this embodiment, the arch support 20 enhances the overall rigidity and load-bearing capacity of the arch support 20, thereby improving the stability of the tunnel structure.

[0053] Furthermore, a third connecting steel plate 114 corresponding to the first connecting steel plate 280 is pre-embedded on the outer wall of the first connecting bracket 112, and the first connecting steel plate 280 and the third connecting steel plate 114 are connected.

[0054] Specifically, by pre-embedding a third connecting steel plate 114 on the outer wall of the first connecting bracket 112 and connecting it to the first connecting steel plate 280, the strength of the connection can be significantly enhanced, ensuring the stability and reliability of the connection, enabling it to withstand loads from above and around the tunnel, and ensuring the safety of the tunnel structure.

[0055] Furthermore, a fourth connecting steel plate (not shown) corresponding to the second connecting steel plate is pre-embedded in the outer wall of the second connecting bracket 122, and the second connecting steel plate and the fourth connecting steel plate are connected. This embodiment, by pre-embedding the fourth connecting steel plate in the outer wall of the second connecting bracket 122 and connecting it to the second connecting steel plate, can significantly enhance the strength and stability of the connection. This design ensures a more robust connection between the second connecting bracket 122 and the arch support 20, enabling it to withstand loads from the tunnel sidewalls and surrounding area, thus guaranteeing the safety of the tunnel structure.

[0056] Furthermore, a steel pipe 60 is pre-embedded inside the arch 20 and filled with grout, which can improve the overall bearing capacity of the arch and effectively maintain the stability of the soil above the tunnel. Preferably, the steel pipe 60 is a φ108 steel pipe.

[0057] As a preferred example, the thickness of the protective arch 20 is set between 80cm and 100cm. It is understood that, in other embodiments, those skilled in the art can design the thickness of the protective arch 20 to other values ​​according to actual needs.

[0058] As a preferred example, both the first pre-reinforced pile 111 and the second pre-reinforced pile 121 have rectangular cross-sections with dimensions of 3m x 2m. In other embodiments, the first pre-reinforced pile 111 and the second pre-reinforced pile 121 may also be piles of other shapes, such as circular piles.

[0059] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A pile-arch support structure suitable for multi-arch tunnels in mountain pass areas, characterized in that, Including pre-reinforced pile components and arch supports, among which, The pre-reinforced pile assembly includes a first pre-reinforced pile assembly located on the outer side of the left line of the tunnel and a second pre-reinforced pile assembly located on the outer side of the right line of the tunnel. The second pre-reinforced pile assembly and the first pre-reinforced pile assembly are arranged in a one-to-one correspondence. The bottom of the first pre-reinforced pile assembly and the second pre-reinforced pile assembly both extend downward to below the tunnel arch bottom, and the top of the first pre-reinforced pile assembly and the second pre-reinforced pile assembly both extend upward to above the tunnel arch top. The protective arch is connected between the first pre-reinforced pile assembly and the second pre-reinforced pile assembly, and the protective arch is located above the left line and the right line of the tunnel.

2. The pile-arch support structure for a multi-arch tunnel in a mountain pass as described in claim 1, characterized in that, The arch support comprises a first connecting section, a first arched section, a second connecting section, a second arched section, and a third connecting section that are sequentially connected along the transverse direction of the tunnel. The first connecting segment is connected to the first pre-reinforced pile assembly. The shape of the first arched segment matches the shape of the left tunnel line and is located at the top of the left tunnel line. The second connecting segment overlaps the top of the central partition wall. The shape of the second arched segment matches the shape of the right tunnel line and is located at the top of the right tunnel line. The third connecting segment is connected to the second pre-reinforced pile assembly.

3. The pile-arch support structure for a multi-arch tunnel in a mountain pass as described in claim 2, characterized in that, The first pre-reinforced pile assembly includes multiple first pre-reinforced piles arranged at intervals along the tunnel extension direction. Each first pre-reinforced pile has a first connecting bracket on the side near the arch. The first connecting section is connected to the first connecting bracket. The bottom of each first pre-reinforced pile extends downward to 5m below the arch bottom of the left tunnel line.

4. The pile-arch support structure for a multi-arch tunnel in a mountain pass as described in claim 2, characterized in that, The second pre-reinforced pile assembly includes multiple second pre-reinforced piles arranged at intervals along the tunnel extension direction. Each second pre-reinforced pile has a second connecting bracket on the side near the arch. The third connecting section is connected to the second connecting bracket. The bottom of each second pre-reinforced pile extends downward to 5m below the arch bottom of the right tunnel line.

5. The pile-arch support structure for a multi-arch tunnel in a mountain pass as described in claim 2, characterized in that, The first connecting segment is connected to the first pre-reinforced pile via a first rebar assembly, and the second connecting segment is connected to the second pre-reinforced pile via a second rebar assembly; wherein, the first rebar assembly includes multiple first transverse rebars arranged at vertical intervals, and the second rebar assembly includes multiple second transverse rebars arranged at vertical intervals.

6. The pile-arch support structure for a multi-arch tunnel in a mountain pass as described in claim 2, characterized in that, The arch support includes an arch support concrete structure, an I-beam arch frame embedded in the arch support concrete structure, and a first connecting steel plate and a second connecting steel plate respectively connected to both ends of the I-beam arch frame. The first connecting steel plate and the second connecting steel plate are respectively exposed at the ends of the arch support concrete structure. The first connecting steel plate is connected to the first connecting bracket, and the second connecting steel plate is connected to the second connecting bracket.

7. The pile-arch support structure for a multi-arch tunnel in a mountain pass as described in claim 6, characterized in that, The outer wall of the first connecting bracket is pre-embedded with a third connecting steel plate corresponding to the first connecting steel plate, and the first connecting steel plate and the third connecting steel plate are connected.

8. The pile-arch support structure for a multi-arch tunnel in a mountain pass as described in claim 6, characterized in that, The outer wall of the second connecting bracket is pre-embedded with a fourth connecting steel plate corresponding to the second connecting steel plate, and the second connecting steel plate and the fourth connecting steel plate are connected.

9. The pile-arch support structure for a multi-arch tunnel in a mountain pass as described in claim 1, characterized in that, The thickness of the protective arch is set between 80cm and 100cm.

10. The pile-arch support structure for a multi-arch tunnel in a mountain pass as described in claim 3, characterized in that, Both the first pre-reinforced pile and the second pre-reinforced pile have rectangular cross-sections with dimensions of 3m x 2m.

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