Karst tunnel surrounding rock reinforcing device and reinforcing method thereof

Abstract

This invention belongs to the field of tunnel construction technology. It discloses a karst tunnel surrounding rock reinforcement device and method, comprising at least one set of outer support members. The outer walls of the outer support members are fixed to the tunnel roof surrounding rock, and the inner walls of the two outer support members are fixed to the two ends of a top support plate. An inner support member is disposed on the inner wall of the top support plate and located at the connection point of two adjacent top support plates. The inner support member passes through the top support plate and the outer support members and is fixed to the tunnel roof surrounding rock. A side wall reinforcement component includes support piles and side support plates. The side walls of the side support plates, the ends of the inner support members, and the ends of the outer support members are all cast and fixed within the support piles. The outer support member is an outer arc-shaped rib. Several first anchor rods are fixedly installed on the top support plate, with the ends of the first anchor rods penetrating the outer arc-shaped ribs and extending into the tunnel roof surrounding rock. The ends of second anchor rods penetrate the inner arc-shaped ribs, the top support plate, and the outer arc-shaped ribs, extending into the tunnel roof surrounding rock. This invention simplifies construction and improves tunnel construction efficiency while ensuring support effectiveness.

Description

Technical Field

[0001] This invention belongs to the field of tunnel construction technology, and in particular relates to a karst tunnel surrounding rock reinforcement device and its reinforcement method. Background Technology

[0002] In areas where limestone is widely distributed, there are a large number of hidden karst caves. The possibility of encountering karst caves during tunnel excavation is relatively high. In the process of infrastructure construction, tunnel projects such as highways and railways sometimes inevitably need to pass through karst strata. These tunnels are called karst tunnels.

[0003] For karst tunnels, in order to ensure the safety performance of karst tunnels, it is necessary to line the surrounding rock with concrete. Before lining with concrete, it is necessary to reinforce the surrounding rock with reinforcement devices.

[0004] In the prior art, patent CN113123812A, entitled "Reinforcement Device for Surrounding Rock of Karst Tunnels," discloses a reinforcement component that is detachably connected in sequence. A support connector serves as the support frame for the entire device, playing a primary supporting role. The reinforced side plate component reinforces the sidewalls of the karst tunnel, and the reinforced top plate component reinforces the arched sections of the karst tunnel, thus reinforcing the surrounding rock in all parts of the karst tunnel and improving the stability of the reinforcement device and the safety of tunnel construction. However, the construction structure is relatively complex and inconvenient for construction.

[0005] Patent CN113775359A, entitled "Initial Support and Reinforcement Structure and Method for Highway Tunnels Crossing Karst Geological Disasters," discloses a series of spaced-apart I-beam arches, including locking rods and several locking nodes. The locking rods are arranged laterally and adjacent to the I-beam arches. The locking nodes are sleeved on the locking rods and fixedly connected to them. Each locking node is fixedly connected to one of the I-beam arches, thus improving the structural strength of the initial support structure. While this structure enhances the structural strength of the initial support structure, it is also inconvenient for construction.

[0006] Therefore, a karst tunnel surrounding rock reinforcement device and reinforcement method are provided, which facilitates construction and improves construction efficiency while ensuring the support effect. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention proposes a karst tunnel surrounding rock reinforcement device and method, which is applicable to karst tunnel surrounding rock reinforcement and can be used as a permanent device. By utilizing the cooperation of internal and external support components, the top support plate is fixed while supporting the surrounding rock at the top of the tunnel, thus achieving support of the top supporting plate for the top surrounding rock. At the same time, the construction is simple, and the tunnel construction efficiency can be improved while ensuring the support effect.

[0008] To achieve the above objectives, the present invention provides a karst tunnel surrounding rock reinforcement device, comprising:

[0009] At least one pair of outer support members, the outer wall of the outer support member is fixed to the surrounding rock at the top of the tunnel, and the two ends of the top support plate are fixed to the inner walls of the two outer support members;

[0010] An inner support member is disposed on the inner wall of the top support plate and located at the connection between two adjacent top support plates. The inner support member passes through the top support plate and the outer support member and is fixed to the surrounding rock at the top of the tunnel.

[0011] The side wall reinforcement includes a support pile and a side support plate, wherein the side wall of the side support plate, the end of the inner support member, and the end of the outer support member are all cast and fixed inside the support pile.

[0012] Furthermore, the outer support member is an outer arc-shaped rib, and the two outer arc-shaped ribs are respectively located at the two ends of the top support plate. Several first anchor rods are fixed through the top support plate, and the ends of the first anchor rods penetrate the outer arc-shaped ribs and extend into the surrounding rock at the top of the tunnel.

[0013] Furthermore, the inner support member is an inner arc-shaped rib, one of which is used to support the ends of two adjacent top support plates. Several second anchor rods are provided on the inner arc-shaped rib, and the ends of the second anchor rods penetrate the inner arc-shaped rib, the top support plate, and the outer arc-shaped rib and extend into the surrounding rock at the top of the tunnel.

[0014] The first anchor bolt and the second anchor bolt are staggered.

[0015] Furthermore, the top support plate includes a top plate and side plates respectively disposed on both sides of the top plate. The top plate has a mounting groove on the side away from the inner support member at both ends, and the side plate is fixed with a mounting plate adapted to the mounting groove at the end near the top plate.

[0016] Furthermore, a reinforcing rib is provided between two adjacent inner arc-shaped ribs. A connecting base is fixed to the inner wall of the inner arc-shaped rib. A connecting bolt is provided on the end of the connecting base away from the reinforcing rib. Threaded holes matching the connecting bolt are opened on the connecting base and the reinforcing rib. The threaded end of the connecting bolt passes through the connecting base and extends into the reinforcing rib to be fixedly connected to the reinforcing rib. The reinforcing rib is used to support the connection between the top plate and the side plate.

[0017] Furthermore, the side support plate includes a plate body, with protrusions fixed to both ends of the plate body. The bottom of the support pile is fixed to the foundation. An insertion groove is opened on the support pile, and the protrusion extends into the insertion groove and blocks the side wall of the insertion groove.

[0018] Furthermore, the inner wall of the outer arc-shaped rib end and the outer wall of the inner arc-shaped rib end are respectively fixed with casting connection plates, the end face of the outer arc-shaped rib and the end face of the inner arc-shaped rib are in contact with the top of the support pile, and the casting connection plate extends into the insertion groove.

[0019] Furthermore, the inner wall of the support pile is provided with grouting holes, which are connected to the insertion groove.

[0020] Methods for reinforcing surrounding rock of karst tunnels:

[0021] S1, Support piles for karst tunnel construction;

[0022] S2. Install a side support plate between the two support piles;

[0023] S3. Install external support components on the top of the karst tunnel, insert the ends of the external support components into the support piles, and fix the top support plate to the inner wall of the external support components;

[0024] S4. Fix the inner support component to the inner wall of the top support plate and insert the end of the inner support component into the support pile;

[0025] S5. Pour concrete into the support pile.

[0026] Compared with the prior art, the present invention has the following advantages and technical effects:

[0027] 1. By using internal and external support components in combination, the top support plate is fixed while supporting the surrounding rock at the top of the tunnel, thus achieving the support of the top support plate for the surrounding rock at the top, and the construction is simple.

[0028] 2. By setting up support piles to fix the side support plates, and simultaneously casting and fixing the ends of the inner and outer support components inside the support piles, the support strength of the inner and outer support components is further improved. Attached Figure Description

[0029] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0030] Figure 1 A three-dimensional view of the reinforcement device;

[0031] Figure 2 for Figure 1 The front view;

[0032] Figure 3 A three-dimensional assembly drawing showing the connection relationship between the external support components and the support piles;

[0033] Figure 4 A three-dimensional view showing the connection between the top support plate and the outer arc-shaped rib;

[0034] Figure 5 for Figure 4 3D assembly drawing;

[0035] Figure 6 for Figure 5 The front view;

[0036] Figure 7 Exploded view to enhance the connection between the pile and the side support plate;

[0037] Figure 8 Flowchart for the construction process of the reinforcement device;

[0038] Figure 9 This is an exploded view of Example 2;

[0039] Figure 10 This is a perspective view of Example 3;

[0040] Among them, 1-top support plate, 101-top plate, 102-side plate, 103-installation groove, 104-installation plate, 2-support pile, 3-side support plate, 301-plate body, 302-protrusion, 4-outer arc rib, 5-first anchor rod, 6-inner arc rib, 7-second anchor rod, 8-reinforcing rib, 9-connecting base, 10-connecting bolt, 11-insertion groove, 12-cast connecting plate, 13-grouting hole, 14-first reinforcing bar, 15-second reinforcing bar, 16-reinforcing rib. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0043] Example 1

[0044] Reference Figures 1-8 The present invention provides a karst tunnel surrounding rock reinforcement device, comprising: at least one outer support member, the outer wall of the outer support member being fixed to the surrounding rock at the top of the tunnel, and the two ends of the top support plate 1 being fixed to the inner walls of the two outer support members.

[0045] Because the tunnel is long, the reinforcement device is formed by assembling multiple external support components. The top support plate 1 is connected end to end in sequence, and external support components are set at both ends of the top support plate 1 to fix the top support plate 1. That is, the external support components on two adjacent top support plates 1 are adjacent.

[0046] An inner support member is installed on the inner wall of the top support plate 1 and located at the connection between two adjacent top support plates 1. The inner support member passes through the top support plate 1 and the outer support member and is fixed to the surrounding rock at the top of the tunnel. The inner support member is used to support the ends of two adjacent top support plates 1, that is, every two adjacent outer support members are used in conjunction with one inner support member.

[0047] The width of the inner support member can be matched with the width of the two adjacent outer support members.

[0048] The side wall reinforcement includes support piles 2 and side support plates 3. The side walls, inner support ends, and outer support ends of the side support plates 3 are all cast and fixed inside the support piles 2. The support piles 2 are located at the connection between the two top support plates 1 and are used to support the ends of the inner and outer support components. At the same time, two adjacent support piles 2 are used to fix the side support plates 3, and the top of the side support plates 3 is used to support the ends of the top support plates 1.

[0049] Specifically, firstly, support piles 2 are constructed to determine their positions. Then, side support plates 3 are installed between two adjacent support piles 2. After the outer wall of the side support plates 3 is installed, outer support components are installed towards the tunnel top and fixed to the surrounding rock at the tunnel top. Simultaneously, both ends of the outer support components are inserted into the support piles 2. Next, a top support plate 1 is installed on the outer support components. After the top support plate 1 is installed, an inner support component is installed on the inner wall of the top support plate 1. The inner support component supports the top support plate 1 and is also fixed to the surrounding rock at the tunnel top, further improving the support strength. At the same time, the end of the inner support component extends into the support pile 2, and grout is injected into the support pile 2, thus forming an integrated structure of the side support plates 3, the ends of the outer support components, the ends of the inner support components, and the support piles 2.

[0050] Further optimize the plan, referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 The outer support is an outer arc-shaped rib 4. The two outer arc-shaped ribs 4 are located at the two ends of the top support plate 1 respectively. Several first anchor rods 5 are fixed on the top support plate 1. The ends of the first anchor rods 5 penetrate the outer arc-shaped ribs 4 and extend into the surrounding rock at the top of the tunnel.

[0051] The outer arc-shaped rib 4 has an arc-shaped structure. The size of the outer arc-shaped rib 4 is designed according to the actual tunnel conditions. During installation, the outer arc-shaped rib 4 is sent to the predetermined position, and holes are drilled in the inner wall of the outer arc-shaped rib 4, or pre-drilled holes are made in the surrounding rock of the tunnel. The outer arc-shaped rib 4 is fixed to the inner wall of the surrounding rock of the tunnel by anchor rods / bolts. Then, the top support plate 1 is installed, and the first anchor rod 5 is passed through the drilled holes on the top support plate 1 and the outer arc-shaped rib 4 and sent into the surrounding rock of the tunnel. The top support plate 1 is fixed to the outer arc-shaped rib 4 by the first anchor rod 5. At the same time, the two ends of the outer arc-shaped rib 4 are in contact with the top of the support pile 2. The support pile 2 can realize the pre-support of the outer arc-shaped rib 4, which facilitates the subsequent installation of the first anchor rod 5. After the first anchor rod 5 is installed, the support pile 2 is used to support the outer arc-shaped rib 4.

[0052] Further optimize the plan, referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 The inner support component is an inner arc-shaped rib 6. One inner arc-shaped rib 6 is used to support the ends of two adjacent top support plates 1. Several second anchor rods 7 are installed on the inner arc-shaped rib 6. The ends of the second anchor rods 7 pass through the inner arc-shaped rib 6, the top support plate 1, and the outer arc-shaped rib 4, extending into the surrounding rock at the top of the tunnel. After the top support plate 1 is installed, the inner arc-shaped rib 6 is installed on the inner wall of the top support plate 1. The inner arc-shaped rib 6 has an arc-shaped structure. The size of the inner arc-shaped rib 6 is designed according to the actual tunnel conditions. During installation, the inner arc-shaped rib 6 is sent to the predetermined position, and holes are drilled or pre-drilled in the inner wall of the inner arc-shaped rib 6. At the same time, holes are drilled or pre-drilled in the inner wall of the outer arc-shaped rib 4. Finally, holes are drilled in the surrounding rock of the tunnel, and the second anchor rods 7 pass through the inner arc-shaped rib 6, the top support plate 1, and the outer arc-shaped rib 4. The inner arc-shaped rib 6 is fixed to the surrounding rock of the tunnel through the second anchor rods 7, which can also strengthen the connection strength between the outer arc-shaped rib 4, the top support plate 1, and the surrounding rock of the tunnel. Similarly, the two ends of the inner arc-shaped rib 6 are in contact with the top of the support pile 2. The support pile 2 can provide pre-support for the inner arc-shaped rib 6, which facilitates the subsequent installation of the second anchor rod 7. After the second anchor rod 7 is installed, the support pile 2 is used to support the inner arc-shaped rib 6.

[0053] The first anchor bolt 5 and the second anchor bolt 7 are staggered.

[0054] Understandably, multiple first anchor bolts 5 and second anchor bolts 7 are provided, which can be distributed at equal or unequal intervals on the outer arc rib 4 and the inner arc rib 6.

[0055] When the first anchor 5 and the second anchor 7 are staggered, that is, the first anchor 5 and the second anchor 7 are spaced apart, there is a second anchor 7 between two adjacent first anchor 5s and a first anchor 5 between two adjacent second anchor 7s.

[0056] Further optimize the plan, referring to Figure 5 , Figure 6 The top support plate 1 includes a top plate 101 and side plates 102 respectively disposed on both sides of the top plate 101. The top plate 101 has a mounting groove 103 on the side away from the inner support member at both ends. The side plate 102 is fixed with a mounting plate 104 that is adapted to the mounting groove 103 at the end near the top plate 101.

[0057] Understandably, based on the tunnel dimensions, the dimensions of the top plate 101 and the side plates 102 are pre-set. During construction, the top plate 101 is installed first, and the side plates 102 are positioned and installed using the mounting grooves 103 at both ends of the top plate 101 as a reference. The cooperation between the mounting grooves 103 and the mounting plates 104 enables the rapid positioning of the top plate 101 and the side plates 102.

[0058] The bottom surface of the side plate 102 can be attached to the side support plate 3. Furthermore, if it is necessary to improve the connection strength between the side plate 102 and the side support plate 3, holes can be drilled in the inner wall of the side plate 102 and the inner wall of the side support plate 3, and connecting brackets can be placed at the corresponding drilling positions. The connecting brackets can be fixed to the side plate 102 and the side support plate 3 with bolts to realize the connection between the side plate 102 and the side support plate 3.

[0059] The top plate 101, side plate 102, and side support plate 3 are all prefabricated in the factory and can be transported to the construction site for assembly. Combined with this installation structure, the fast installation of the fixing device can be achieved.

[0060] Further optimize the plan, referring to Figure 5 , Figure 6 A reinforcing rib 8 is provided between two adjacent inner arc-shaped ribs 6. A connecting base 9 is fixed to the inner wall of the inner arc-shaped rib 6. A connecting bolt 10 is provided on the end of the connecting base 9 away from the reinforcing rib 8. Threaded holes matching the connecting bolt 10 are opened on the connecting base 9 and the reinforcing rib 8. The threaded end of the connecting bolt 10 passes through the connecting base 9 and extends into the reinforcing rib 8 to be fixed to the reinforcing rib 8. The reinforcing rib 8 is used to support the connection between the top plate 101 and the side plate 102.

[0061] Understandably, since the top plate 101 and the side plate 102 are connected to each other at their ends, in order to improve the installation strength at the connection, a reinforcing rib 8 is provided. The reinforcing rib 8 is fixed to the inner arc-shaped rib 6 by the connecting bolt 10 to support the top plate 101 and the side plate 102.

[0062] Further optimize the plan, referring to Figure 7The side support plate 3 includes a plate body 301, with protrusions 302 fixed at both ends of the plate body 301. The bottom of the support pile 2 is fixed to the foundation. The support pile 2 has an insertion groove 11, and the protrusions 302 extend into the insertion groove 11 and block the side wall of the insertion groove 11.

[0063] The presence of the protrusion 302 allows the two side walls of the plate body 301 to extend into the insertion groove 11 and enables the side support plate 3 to be connected and supported with the support pile 2. At the same time, the protrusion 302 blocks the insertion groove 11, making the insertion groove 11 in the support pile 2 a cavity into which concrete can be poured.

[0064] Meanwhile, the support pile 2 should be pre-cast and fixed on the foundation, and a penetration groove 11 should be reserved during the casting process.

[0065] Among them, the support pile 2 needs to be embedded in stable bedrock. At the same time, when pouring the support pile 2, it is necessary to ensure that the top surface of the support pile 2 is at the same height.

[0066] Further optimize the plan, referring to Figure 3 , Figure 7 The inner wall of the outer arc rib 4 and the outer wall of the inner arc rib 6 are respectively fixed with cast-in-place connecting plates 12. The end faces of the outer arc rib 4 and the inner arc rib 6 are in contact with the top of the support pile 2. The cast-in-place connecting plates 12 extend into the groove 11.

[0067] The casting connection plate 12 extends into the insertion groove 11 to connect the ends of the outer arc rib 4 and the inner arc rib 6 with the support pile 2. The casting connection plate 12 is located between two adjacent protrusions 302 to ensure that the casting connection plate 12 can extend normally into the insertion groove 11.

[0068] Further optimize the plan, referring to Figure 3 ,、 Figure 7 The inner wall of the support pile 2 is provided with a grouting hole 13, which is connected to the insertion groove 11. The grouting hole 13 is used to inject grout into the insertion groove 11, and it is necessary to ensure that the casting connecting plate 12 and the protrusion 302 do not block the grouting hole 13.

[0069] Reference Figure 8 Based on the karst tunnel surrounding rock reinforcement method, the construction steps include:

[0070] S1. Construction of support piles 2 for karst tunnels. Based on the actual conditions of the karst tunnel, select the installation point for support piles 2, and erect formwork and cast support piles 2 at the installation point. After the support piles 2 are cast and cured, the formwork is removed. The support piles 2 are fixed to the foundation or top surface and have a through groove 11.

[0071] During the pouring of the support pile 2, a steel cage or steel bars are tied to support the support pile 2.

[0072] S2. Install the side support plate 3 between the two support piles 2. Use machinery to lift the side support plate 3 and send it between the two support piles 2. After matching the protrusion 302 with the insertion groove 11, lower the plate body 301. The protrusion 302 enters the insertion groove 11, and the two protrusions 302 in the insertion groove 11 on the same support pile 2 cooperate with the inner wall of the support pile 2 to form a cavity that can be poured with concrete.

[0073] S3. Install external support components at the top of the karst tunnel and insert the ends of the external support components into the support piles 2. Fix the top support plate 1 to the inner wall of the external support components. Install external arc-shaped ribs 4 into the surrounding rock at the top of the tunnel. The two ends of the external arc-shaped ribs 4 contact the top of the support piles 2. Insert the cast-in-place connecting plate 12 on the inner wall of the external arc-shaped ribs 4 into the insertion groove 11. Drill holes in the inner wall of the external arc-shaped ribs 4, or pre-drill holes in the surrounding rock of the tunnel. Fix the external arc-shaped ribs 4 to the top of the surrounding rock of the tunnel using anchor rods / bolts.

[0074] After the outer arc rib 4 is installed, the top plate 101 is lifted by mechanical device, and the top plate 101 and the outer arc rib 4 are fixed by the first anchor rod 5. Then the side plate 102 is hoisted and the top plate 101 and the side plate 102 are spliced ​​together. The remaining first anchor rods 5 are passed through the drill hole and sent into the tunnel surrounding rock. The outer arc rib 4 is fixed to the top of the tunnel surrounding rock by the first anchor rods 5.

[0075] The casting connection plate 12 can be pre-welded and fixed to the outer arc rib 4, or, after the first anchor rod 5 is installed on the outer arc rib 4, the casting connection plate 12 is sent into the insertion groove 11 and then welded to the outer arc rib 4.

[0076] S4. Fix the inner support member to the inner wall of the top support plate 1, and insert the end of the inner support member into the support pile 2. After the top support plate 1 is installed, install the inner arc-shaped rib 6 to the inner wall of the top support plate 1, and fix it with the second anchor rod 7.

[0077] S5. Pour concrete into the support pile 2. Grout into the grouting hole 13, pour and fix the support pile 2, the protrusion 302, and the connecting plate 12.

[0078] Example 2

[0079] Reference Figure 9 Based on Example 1, a number of first reinforcing bars 14 are connected between the casting connection plate 12 on the inner wall of the outer arc rib 4 and the casting connection plate 12 on the outer wall of the inner arc rib 6. A number of second reinforcing bars 15 are fixed on the side of the protrusion 302 away from the plate body 301. The first reinforcing bars 14 and the second reinforcing bars 15 are arranged alternately.

[0080] With this structure, after concrete is poured into the groove 11, the connection strength of the support pile 2, the protrusion 302, and the cast connection plate 12 can be improved by the first steel bar 14 and the second steel bar 15.

[0081] Example 3

[0082] Reference Figure 10 Based on Example 1 or Example 2, a reinforcing rib 16 is welded and fixed between a pair of outer arc-shaped ribs 4. The reinforcing rib 16 is used to improve the connection strength between the pair of outer arc-shaped ribs 4.

[0083] The above are merely preferred embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A karst tunnel surrounding rock reinforcement device, characterized in that: include: At least one pair of outer support members, the outer wall of the outer support member is fixed to the surrounding rock at the top of the tunnel, and the inner walls of the two outer support members are fixed with the two ends of the top support plate (1); An inner support member is provided on the inner wall of the top support plate (1) and located at the connection between two adjacent top support plates (1). The inner support member passes through the top support plate (1) and the outer support member and is fixed to the surrounding rock at the top of the tunnel. The side wall reinforcement includes a support pile (2) and a side support plate (3), wherein the side wall of the side support plate (3), the end of the inner support member, and the end of the outer support member are all cast and fixed inside the support pile (2); The external support is an outer arc-shaped rib (4). The two outer arc-shaped ribs (4) are located at the two ends of the top support plate (1). A number of first anchor rods (5) are fixed on the top support plate (1). The ends of the first anchor rods (5) penetrate the outer arc-shaped ribs (4) and extend into the surrounding rock at the top of the tunnel. The inner support member is an inner arc-shaped rib (6). One inner arc-shaped rib (6) is used to support the ends of two adjacent top support plates (1). Several second anchor rods (7) are provided on the inner arc-shaped rib (6). The ends of the second anchor rods (7) penetrate the inner arc-shaped rib (6), the top support plate (1), and the outer arc-shaped rib (4) and extend into the surrounding rock at the top of the tunnel. The first anchor rod (5) and the second anchor rod (7) are staggered; The side support plate (3) includes a plate body (301), and protrusions (302) are fixed at both ends of the plate body (301). The bottom of the support pile (2) is fixed to the foundation. A through groove (11) is opened on the support pile (2). The protrusion (302) extends into the through groove (11) and the protrusion (302) blocks the side wall of the through groove (11). The inner wall of the outer arc rib (4) and the outer wall of the inner arc rib (6) are respectively fixed with casting connection plates (12). The end face of the outer arc rib (4) and the end face of the inner arc rib (6) are in contact with the top of the support pile (2). The casting connection plate (12) extends into the insertion groove (11).

2. The karst tunnel surrounding rock reinforcement device according to claim 1, characterized in that: The top support plate (1) includes a top plate (101) and side plates (102) respectively disposed on both sides of the top plate (101). The top plate (101) has a mounting groove (103) on the side away from the inner support member at both ends. The side plate (102) is fixed with a mounting plate (104) that is adapted to the mounting groove (103) at the end near the top plate (101).

3. The karst tunnel surrounding rock reinforcement device according to claim 2, characterized in that: A reinforcing rib (8) is provided between two adjacent inner arc-shaped ribs (6). A connecting base (9) is fixedly connected to the inner wall of the inner arc-shaped rib (6). A connecting bolt (10) is provided on the end of the connecting base (9) away from the reinforcing rib (8). Threaded holes matching the connecting bolt (10) are opened on the connecting base (9) and the reinforcing rib (8). The threaded end of the connecting bolt (10) passes through the connecting base (9) and extends into the reinforcing rib (8) to be fixedly connected to the reinforcing rib (8). The reinforcing rib (8) is used to support the connection between the top plate (101) and the side plate (102).

4. The karst tunnel surrounding rock reinforcement device according to claim 1, characterized in that: The inner wall of the support pile (2) is provided with a grouting hole (13), which is connected to the groove (11).

5. A method for reinforcing surrounding rock of karst tunnels, and the device for reinforcing surrounding rock of karst tunnels according to claim 1, characterized in that: The construction steps include: S1, Support piles for karst tunnel construction (2); S2. Install side support plate (3) between the two support piles (2); S3. Install external support components on the top of the karst tunnel and insert the end of the external support component into the support pile (2), and fix the top support plate (1) to the inner wall of the external support component. S4. Fix the inner support member to the inner wall of the top support plate (1) and send the end of the inner support member into the support pile (2); S5. Pour concrete into the support pile (2).

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