Supporting structure for initial supporting and repairing of vault collapse section

Abstract

The utility model provides a supporting structure for repairing an initial support of an arch crown collapse section, which comprises a first temporary supporting assembly, a second temporary supporting assembly, a temporary inclined supporting assembly and a permanent supporting assembly, the first temporary supporting assembly is used for supporting the initial support of an existing tunnel of a non-collapse section close to the collapse section, and the second temporary supporting assembly is used for supporting the initial support of the existing tunnel of the non-collapse section close to the collapse section. The second temporary supporting assembly is arranged on the side edge of a collapse cavity opening and used for supporting an existing tunnel primary support of a collapse section, the permanent supporting assembly is used for blocking the collapse cavity opening, and the two ends, in the extending direction of the tunnel, of the permanent supporting assembly are connected with the corresponding first temporary supporting assemblies correspondingly. The permanent supporting assemblies are connected with the corresponding second temporary supporting assemblies along the two sides of the tunnel in the annular direction, and the permanent supporting assemblies and the second temporary supporting assemblies are connected in the annular direction of the tunnel to form an arch-shaped supporting structure. By means of the structure, the safety, convenience and economical efficiency of vault collapse section repairing can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnels, in particular to a support structure for repairing the initial support of the crown collapse section. Background Art

[0002] Collapse phenomena often occur during tunnel construction. Due to the diversity and complexity of the engineering geological environment where the tunnel is located, the types of collapse are diverse. Among them, after the initial support is completed, with the passage of time, under various disturbances and surrounding rock stresses, collapse phenomena are likely to occur, resulting in damage to the initial support at local positions and the formation of collapse cavities.

[0003] Generally speaking, for the tunnel repair of the crown collapse section of the initial support section in the tunnel, the conventional method is to wait for the collapse cavity to stabilize, spray concrete in the collapse cavity, demolish the damaged I-beams in the full section, increase the lining support parameters, excavate the chamber, re-construct the I-beam arch, use a formwork to seal the collapse opening on the top surface of the steel frame, then spray concrete on the steel frame to form the initial support, reserve a grouting pipe at the collapse opening, after the treatment is completed, grout through the reserved grouting pipe to form a C25 concrete protective arch, backfill with sand or foam concrete on the protective arch, and then adjust the lining type to adopt a lining structure type with a higher protection level to ensure the construction safety of the tunnel collapse section.

[0004] However, the premise of this repair method is that construction can only be carried out after waiting for the collapse cavity to reach a stable state. Otherwise, the safety during construction cannot be guaranteed (the staff and equipment are exposed under the collapse cavity before the construction of the protective arch), which further increases the construction period, delays the construction progress, and indirectly increases the construction cost. Secondly, adopting a lining structure type with a higher protection level considers too much about safety and ignores the construction convenience and cycle. That is, if a higher-grade lining type is adopted, it is necessary to demolish the full-section initial support including the undamaged initial support and excavate the surrounding rock, which is extremely inconvenient for construction. While increasing the construction risk, it also increases the cost of treating the tunnel collapse in the tunnel.

[0005] In view of this, it is necessary to propose a support structure for repairing the initial support of the crown collapse section to solve or at least alleviate the above defects. Summary of the Utility Model

[0006] The main purpose of the utility model is to provide a support structure for repairing the initial support of the crown collapse section, so as to solve the technical problems that the existing repair method has great safety risks for staff and equipment, and too much consideration of safety ignores the construction convenience.

[0007] To achieve the above purpose, the utility model provides a support structure for repairing the initial support of the crown collapse section, including a first temporary support component, a second temporary support component, a temporary diagonal support component, and a permanent support component. Among them,

[0008] The first temporary support component is used to support the initial support of the existing tunnel in the non-collapsed section near the collapsed section.

[0009] The second temporary support component is arranged on the side of the cavity opening. The second temporary support component is used to support the initial support of the existing tunnel in the collapsed section. Among them, the second temporary support component includes a first end and a second end arranged oppositely along its own extension direction. The first end is lapped on the tunnel springing, and the second end extends from the first end along the circumferential direction of the tunnel to the boundary of the cavity opening and is connected to the high-position end of the temporary diagonal support component. The low-position end of the temporary diagonal support component is supported on the collapsed body.

[0010] The permanent support component is used to seal the cavity opening. The two ends of the permanent support component along the tunnel extension direction are respectively connected to the corresponding first temporary support components, and the two sides of the permanent support component along the circumferential direction of the tunnel are respectively connected to the corresponding second temporary support components. The permanent support component and the second temporary support component are connected in the circumferential direction of the tunnel to form an arch-shaped support structure.

[0011] Preferably, the first temporary support component is a first corrugated steel plate. The two ends of the first corrugated steel plate along the circumferential direction of the tunnel are respectively lapped at the tunnel springing, and the outer wall of the first corrugated steel plate is closely attached to the initial support of the existing tunnel.

[0012] Preferably, the number of the temporary diagonal support components is multiple, and the multiple temporary diagonal support components corresponding to each second temporary support component are arranged at intervals along the tunnel extension direction.

[0013] Preferably, the second temporary support component is a second corrugated steel plate.

[0014] Preferably, the second corrugated steel plate includes a second corrugated steel plate body, a first connecting plate and a second connecting plate connected to the boundary of the second corrugated steel plate body. The first connecting plate protrudes from the inner wall of the second corrugated steel plate body, and the second connecting plate is connected to the outer wall of the bottom of the first connecting plate. The first connecting plate and the second connecting plate form an L-shaped connecting plate.

[0015] Preferably, each temporary diagonal support component includes an I-beam main body, a backing plate and a channel steel respectively connected to both ends of the I-beam main body. The second corrugated steel plate body is formed with a connecting groove matching the backing plate. The backing plate is provided with a first connecting hole for a bolt to penetrate, and the connecting groove is provided with a second connecting hole corresponding to the first connecting hole one by one. The backing plate is connected to the second corrugated steel plate body by a bolt penetrating the first connecting hole and the second connecting hole. The channel steel extends along the tunnel extension direction, and the channel steel is laid on the collapsed body.

[0016] Preferably, the permanent support assembly is a third corrugated steel plate, wherein,

[0017] The first corrugated steel plate includes a first corrugated steel plate body, a third connecting plate and a fourth connecting plate connected to the boundary of the first corrugated steel plate body. The third connecting plate protrudes from the inner wall of the first corrugated steel plate body, and the fourth connecting plate is connected to the outer wall of the bottom of the third connecting plate. The third connecting plate and the fourth connecting plate form an L-shaped connecting plate;

[0018] The third corrugated steel plate includes a third corrugated steel plate body, a fifth connecting plate and a sixth connecting plate connected to the boundary of the third corrugated steel plate body. The fifth connecting plate protrudes from the inner wall of the third corrugated steel plate body, and the sixth connecting plate is connected to the outer wall of the bottom of the fifth connecting plate. The fifth connecting plate and the sixth connecting plate form an L-shaped connecting plate;

[0019] Wherein, the third connecting plate is connected to the fifth connecting plate, the fourth connecting plate is connected to the fourth connecting plate, the first connecting plate is connected to the fifth connecting plate, and the second connecting plate is connected to the sixth connecting plate.

[0020] Preferably, the third corrugated steel plate body is provided with a reserved hole for the bolt to penetrate through and a grouting hole for the grouting pipe to penetrate through.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] The utility model provides a support structure for repairing the initial support of the vault collapse section. By erecting the second temporary support assembly and the temporary diagonal support assembly, the overall stability and bearing capacity of the tunnel structure can be effectively enhanced, and the stress burden on the initial support of the existing tunnel can be reduced; it can effectively prevent the collapse from further spreading to the non-collapse section and ensure the safe progress of tunnel construction; the construction of the permanent support assembly effectively seals the collapse cavity opening, prevents the collapse from further expanding, ensures the safety of the construction personnel and equipment below, and preferably can also provide a locking foundation for the bolt, a penetration foundation for the first grouting pipe and the second grouting pipe, and can be used as a grouting template when constructing the collapse cavity filling, reducing the project cost. The permanent support assembly is connected to the second temporary support assembly in the circumferential direction in time to form a complete arch ring, and is connected to the first temporary support assembly in the longitudinal direction, and cooperates with the bolt to form a strong overall support system, greatly improving the safety during the construction period, and can also be used as the tunnel lining structure to permanently participate in the force bearing in the later stage;

[0023] In addition, the utility model does not need to demolish the initial support of the full section. By using the structure of the present application, only the steel arch frame of the damaged part needs to be demolished, and a combined structure of corrugated steel plate and I-beam is used as the temporary support structure, which can be quickly assembled. The remaining parts are all connected by bolts, which is convenient for installation and disassembly, improves work efficiency, ensures the convenience of construction, saves project cost, and has good popularization prospects. Brief Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0025] Figure 1 Application scenario diagram of the overall structure in an embodiment of the present utility model;

[0026] Figure 2 Connection schematic diagram of the permanent support assembly and the first temporary support assembly in an embodiment of the present utility model;

[0027] Figure 3 Connection schematic diagram of the permanent support assembly and the second temporary support assembly in an embodiment of the present utility model;

[0028] Figure 4 Connection schematic diagram of the second temporary support assembly and the temporary diagonal brace assembly in an embodiment of the present utility model;

[0029] Figure 5 Structure schematic diagram of the second corrugated steel plate in an embodiment of the present utility model.

[0030] The realization of the purpose, functional features and advantages of the present utility model will be further described with reference to the embodiments and the drawings.

[0031] Explanation of the reference numerals in the drawings:

[0032] 10. Cavity collapse; 110. Collapsed body; 210. First corrugated steel plate; 211. First corrugated steel plate body; 212. Third connecting plate; 213. Fourth connecting plate; 30. Second temporary support assembly; 310. First end; 320. Second end; 330. Second corrugated steel plate; 331. Second corrugated steel plate body; 332. First connecting plate; 333. Second connecting plate; 334. Connecting groove; 335. Second connecting hole; 410. I-beam body; 420. Base plate; 430. Channel steel; 50. Permanent support assembly; 510. Third corrugated steel plate; 511. Third corrugated steel plate body; 512. Fifth connecting plate; 513. Sixth connecting plate; 60. Initial support of existing tunnel; 610. Initial support steel arch; 70. Grouting pipe. Detailed implementation mode

[0033] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0036] In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions appears to be contradictory or unable to be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0037] Please refer to the attached Figures 1 to 5, a support structure for the initial support repair of the vault collapse section provided by the present utility model includes a first temporary support component (not shown in the figure), a second temporary support component 30, a temporary diagonal support component (not shown in the figure), and a permanent support component 50. Among them,

[0038] The first temporary support component is used to support the existing tunnel initial support 60 of the non-collapse section near the collapse section. As a preferred example, the first temporary support component uses corrugated steel plates. The corrugated steel plates are transported to the construction site. In the non-collapse section 10m before and after the collapse section, a temporary support structure is composed of 8mm thick 400mm*150mm corrugated steel plates, which are closely attached to the tunnel initial support to ensure the stability of the adjacent sections of the collapse section and minimize the impact on the adjacent non-collapse sections caused by the repair of the collapse section.

[0039] As Figure 1 shown, the second temporary support component 30 is arranged on the side of the collapse cavity opening, that is, the second temporary support component 30 is arranged on both sides of the collapse cavity opening. The second temporary support component 30 is used to support the existing tunnel initial support 60 of the collapse section. Among them, the second temporary support component 30 includes a first end 310 and a second end 320 arranged oppositely along its own extension direction. The first end 310 is lapped on the tunnel springing, and the second end 320 extends from the first end 310 along the tunnel circumferential direction to the boundary of the collapse cavity opening and is connected to the high-position end of the temporary diagonal support component. The low-position end of the temporary diagonal support component is supported on the collapse body 110;

[0040] Specifically, the second temporary support component 30 can be made of rigid materials such as I-beams or steel pipes, extends along the tunnel circumferential direction, one end is lapped on the tunnel springing, and the other end extends to the boundary of the collapse cavity opening. The second temporary support component 30 is closely attached to the existing tunnel initial support 60 to form an effective support system. By erecting the second temporary support component and the temporary diagonal support component, the overall stability and bearing capacity of the tunnel structure can be effectively enhanced, and the stress burden on the existing tunnel initial support 60 can be reduced; it can effectively prevent the collapse from further spreading to the non-collapse section and ensure the safe progress of tunnel construction. As a preferred example, within the range from the two side boundaries of the collapse opening in the collapse section to the tunnel springing, a temporary support structure of 8mm thick 400mm*150mm corrugated steel plates is erected. One side is lapped on the tunnel springing, and the other side is supported by an I20 I-beam. One end of the I-beam can be connected to the corrugated steel plate through a backing plate 420, and the other end is supported on the collapse body 110.

[0041] Secondly, during actual construction, the collapsed body 110 located below the collapse cavity 10 can be compacted, and then the surface of the collapsed body 110 can be sealed with sprayed concrete to ensure the stability of the collapsed body 110. The compaction operation can significantly improve the density of the collapsed body 110, thereby enhancing its stability and preventing further collapse or sliding. By sealing the surface of the collapsed body 110 with sprayed concrete, a safer working environment can be provided for construction workers. Specifically, the collapsed bodies 110 on both sides projected by the collapse opening can be compacted, a working platform can be cleared, and the collapsed bodies 110 can be initially sprayed with C25 concrete for sealing to ensure the stability of the collapsed bodies 110.

[0042] The permanent support assembly 50 is used to block the collapse cavity opening. The two ends of the permanent support assembly 50 along the tunnel extension direction are respectively connected to the corresponding first temporary support assemblies, and the two sides of the permanent support assembly 50 along the tunnel circumferential direction are respectively connected to the corresponding second temporary support assemblies 30. The permanent support assembly 50 and the second temporary support assemblies 30 are connected in the tunnel circumferential direction to form an arch-shaped support structure.

[0043] Specifically, the construction of the permanent support assembly 50 effectively blocks the collapse cavity opening, prevents the further expansion of the collapse, ensures the safety of the construction workers and equipment below, and at the same time provides a locking foundation for the anchor bolts and a penetration foundation for the first grouting pipe 70 and the second grouting pipe 70 in the preferred embodiment, and can also be used as a formwork for constructing the arch protection layer, reducing the project cost. The permanent support assembly 50 is timely connected to the second temporary support assemblies 30 in the circumferential direction to form a complete arch ring, and is connected to the first temporary support assemblies in the longitudinal direction. In the preferred example, it cooperates with the anchor bolts to form a strong overall support system, greatly improving the safety during the construction period, and can also permanently participate in the force bearing as the tunnel lining structure in the later stage.

[0044] As a preferred embodiment, the first temporary support assembly is the first corrugated steel plate 210. The two ends of the first corrugated steel plate 210 along the tunnel circumferential direction are respectively lapped at the tunnel springing. The outer wall of the first corrugated steel plate 210 is closely attached to the existing tunnel primary support 60. The use of corrugated steel plates can achieve rapid assembly, can be bolted, is convenient for installation and disassembly, improves work efficiency, and at the same time, the corrugated steel plates have high strength and durability and can provide strong support capacity.

[0045] Furthermore, the number of the temporary diagonal bracing assemblies is multiple, and the multiple temporary diagonal bracing assemblies corresponding to each second temporary support assembly 30 are arranged at intervals along the tunnel extension direction. As Figure 1 shown, second temporary support assemblies 30 are respectively provided on both sides of the collapse cavity opening, and the second ends 320 of each second temporary support assembly 30 are supported by the corresponding temporary diagonal bracing assemblies, which can greatly improve the overall support strength and stability.

[0046] As a preferred example, the second temporary support assembly 30 is a second corrugated steel plate 330.

[0047] As a preferred embodiment, the second corrugated steel plate 330 includes a second corrugated steel plate body 331, a first connecting plate 332 and a second connecting plate 333 connected to the boundary of the second corrugated steel plate body 331. The first connecting plate 332 protrudes from the inner wall of the second corrugated steel plate body 331, and the second connecting plate 333 is connected to the outer wall of the bottom of the first connecting plate 332. The first connecting plate 332 and the second connecting plate 333 form an L-shaped connecting plate.

[0048] As a preferred embodiment, each of the temporary diagonal bracing assemblies includes an I-beam body 410, a backing plate 420 and a channel steel 430 respectively connected to both ends of the I-beam body 410. The second corrugated steel plate body 331 is formed with a connecting groove 334 matching the backing plate 420. The backing plate 420 is provided with a first connection hole (not shown in the figure) for the bolt to penetrate through. The connecting groove 334 is provided with a second connection hole 335 corresponding to the first connection hole one by one. The backing plate 420 is connected to the second corrugated steel plate body 331 by bolts penetrating through the first connection hole and the second connection hole 335. The channel steel 430 extends along the tunnel extension direction, and the channel steel 430 is laid on the collapse body 110.

[0049] As Figure 4 shown, in this embodiment, the bolts are used to penetrate through the first connection hole on the backing plate 420 and the second connection hole 335 on the second corrugated steel plate body 331 for connection, making the installation and disassembly process of the diagonal bracing assembly simple and fast; by setting longitudinal working platforms on both sides of the collapse body 110 and laying channel steel 430, a stable support foundation is provided for the temporary diagonal bracing assembly, effectively enhancing the stability of the temporary diagonal bracing assembly and preventing it from shifting or collapsing during the construction process, thus ensuring the stability of the entire support structure.

[0050] As a preferred embodiment, the permanent support assembly 50 is a third corrugated steel plate 510. Among them, the first corrugated steel plate 210 includes a first corrugated steel plate body 211, a third connecting plate 212 and a fourth connecting plate 213 connected to the boundary of the first corrugated steel plate body 211. The third connecting plate 212 protrudes from the inner wall of the first corrugated steel plate body 211, and the fourth connecting plate 213 is connected to the outer wall of the bottom of the third connecting plate 212. The third connecting plate 212 and the fourth connecting plate 213 form an L-shaped connecting plate;

[0051] The third corrugated steel plate 510 includes a third corrugated steel plate body 511, a fifth connecting plate 512 and a sixth connecting plate 513 connected to the boundary of the third corrugated steel plate body 511. The fifth connecting plate 512 protrudes from the inner wall of the third corrugated steel plate body 511, and the sixth connecting plate 513 is connected to the outer wall of the bottom of the fifth connecting plate 512. The fifth connecting plate 512 and the sixth connecting plate 513 form an L-shaped connecting plate;

[0052] Among them, the third connecting plate 212 is connected to the fifth connecting plate 512, the fourth connecting plate 213 is connected to the fourth connecting plate 213, the first connecting plate 332 is connected to the fifth connecting plate 512, and the second connecting plate 333 is connected to the sixth connecting plate 513.

[0053] Specifically, the design of the L-shaped connecting plate significantly enhances the connection strength between the first corrugated steel plate 210 and the second corrugated steel plate 330 by increasing the connection area and providing additional support points. The design of the L-shaped connecting plate makes the connection process between the third connecting plate 212 and the fifth connecting plate 512, the fourth connecting plate 213 and the fourth connecting plate 213, the first connecting plate 332 and the fifth connecting plate 512, and the second connecting plate 333 and the sixth connecting plate 513 more simple and fast, reducing the installation time and labor cost.

[0054] As a preferred example, the collapse opening range is blocked by a corrugated steel plate with a specification of 1 cm thick and 500 mm * 400 mm. The four sides of the 500 mm * 400 mm corrugated steel plate are connected to the 400 mm * 150 mm corrugated steel plate; the corrugated steel plate specification can be 8 mm thick and 400 mm * 150 mm. The wave pitch of the corrugated steel plate blocking the collapse opening should correspond to the spacing of the initial support steel arch 610. For example, if the initial support uses I20 steel beams with a thickness of 26 cm and a spacing of 50 cm between the steel beams, the wave pitch of the corrugated steel plate is 50 cm, for example Figure 2 as shown.

[0055] Furthermore, the third corrugated steel plate body 511 is reserved with a reserved hole (not shown in the figure) for the bolt to penetrate and a grouting hole (not shown in the figure) for the grouting pipe 70 to penetrate.

[0056] Specifically, anchor bolts can be driven through the reserved holes. Preferably, the anchor bolts are driven obliquely at an angle of 15° to enhance stability. A grouting pipe 70 is installed at the position of the grouting hole, and the sealing performance between the grouting pipe 70 and the hole wall is ensured. Concrete is prepared according to the design requirements to ensure that the indicators such as the strength and fluidity of the concrete meet the construction requirements. The grouting equipment is started, and concrete is injected into the cavity 10 through the grouting pipe 70. During the grouting process, the grouting pressure and the grouting volume need to be controlled to ensure that the concrete can evenly and densely fill the space of the cavity 10. As the concrete is injected and solidified, a solid filling layer is gradually formed on the top of the permanent support component 50. This layer of arch protection layer can effectively disperse and bear the pressure of the overlying rock and soil mass, improving the stability of the tunnel structure.

[0057] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied to other related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. A support structure for the initial support repair of the crown collapse section, characterized in that It includes a first temporary support component, a second temporary support component, a temporary diagonal support component, and a permanent support component. Among them, The first temporary support component is used to support the initial support of the existing tunnel in the non-collapsed section near the collapsed section. The second temporary support component is arranged on the side of the cavity opening. The second temporary support component is used to support the initial support of the existing tunnel in the collapsed section. Among them, the second temporary support component includes a first end and a second end that are oppositely arranged along its extending direction. The first end is lapped on the tunnel springing, and the second end extends from the first end along the tunnel circumferential direction to the boundary of the cavity opening and is connected to the high-position end of the temporary diagonal support component. The low-position end of the temporary diagonal support component is supported on the collapsed body. The permanent support component is used to seal the cavity opening. The two ends of the permanent support component along the tunnel extending direction are respectively connected to the corresponding first temporary support components, and the two sides of the permanent support component along the tunnel circumferential direction are respectively connected to the corresponding second temporary support components. The permanent support component and the second temporary support component are connected in the tunnel circumferential direction to form an arched support structure.

2. The support structure for the initial support repair of the crown collapse section according to claim 1, characterized in that, The first temporary support component is a first corrugated steel plate. The two ends of the first corrugated steel plate along the tunnel circumferential direction are respectively lapped at the tunnel springing, and the outer wall of the first corrugated steel plate is closely attached to the initial support of the existing tunnel.

3. The support structure for the initial support repair of the vault collapse section according to claim 2, characterized in that, The number of the temporary diagonal support components is multiple, and the multiple temporary diagonal support components corresponding to each second temporary support component are arranged at intervals along the tunnel extending direction.

4. The support structure for the initial support repair of the vault collapse section according to claim 3, characterized in that, The second temporary support component is a second corrugated steel plate.

5. The support structure for the initial support repair of the vault collapse section according to claim 4, characterized in that, The second corrugated steel plate includes a second corrugated steel plate body, a first connecting plate and a second connecting plate connected to the boundary of the second corrugated steel plate body. The first connecting plate protrudes from the inner wall of the second corrugated steel plate body, and the second connecting plate is connected to the bottom outer wall of the first connecting plate. The first connecting plate and the second connecting plate form an L-shaped connecting plate.

6. The support structure for the initial support repair of the vault collapse section according to claim 5, wherein, Each temporary diagonal support component includes an I-beam main body, a backing plate and a channel steel respectively connected to both ends of the I-beam main body. The second corrugated steel plate body is formed with a connecting groove matching the backing plate. The backing plate is provided with a first connection hole for a bolt to pass through, and the connecting groove is provided with a second connection hole corresponding to the first connection hole one by one. The backing plate is connected to the second corrugated steel plate body by a bolt passing through the first connection hole and the second connection hole. The channel steel extends along the tunnel extending direction, and the channel steel is laid on the collapsed body.

7. The support structure for the initial support repair of the vault collapse section according to claim 5, characterized in that, The permanent support component is a third corrugated steel plate. Among them, The first corrugated steel plate includes a first corrugated steel plate body, a third connecting plate and a fourth connecting plate connected to the boundary of the first corrugated steel plate body. The third connecting plate protrudes from the inner wall of the first corrugated steel plate body, and the fourth connecting plate is connected to the bottom outer wall of the third connecting plate. The third connecting plate and the fourth connecting plate form an L-shaped connecting plate; The third corrugated steel plate includes a third corrugated steel plate body, a fifth connecting plate and a sixth connecting plate connected to the boundary of the third corrugated steel plate body. The fifth connecting plate protrudes from the inner wall of the third corrugated steel plate body, and the sixth connecting plate is connected to the outer wall of the bottom of the fifth connecting plate. The fifth connecting plate and the sixth connecting plate form an L-shaped connecting plate; Among them, the third connecting plate is connected to the fifth connecting plate, the fourth connecting plate is connected to the fourth connecting plate, the first connecting plate is connected to the fifth connecting plate, and the second connecting plate is connected to the sixth connecting plate.

8. The support structure for the initial support repair of the vault collapse section according to claim 7, characterized in that, The third corrugated steel plate body is reserved with a reserved hole for the bolt to penetrate through and a grouting hole for the grouting pipe to penetrate through.

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