Flexible support structure and method of construction thereof

Abstract

The present application relates to the technical fields of tunnel supporting engineering, and discloses a flexible supporting structure and a construction method thereof, the flexible supporting structure comprising a supporting assembly and a plurality of connecting assemblies, the supporting assembly comprising a first supporting piece, a plurality of second supporting pieces and a third supporting piece, the first supporting piece and the third supporting piece being oppositely arranged, all the second supporting pieces being arranged between the first supporting piece and the third supporting piece, and any supporting piece being arranged along the axial direction of the tunnel; any connecting assembly being arranged between the first supporting piece and the second supporting piece, between the second supporting piece and the third supporting piece, or between two adjacent second supporting pieces, and any connecting assembly comprising a plurality of deformation pieces arranged along the axial direction of the tunnel at intervals; wherein any deformation piece is arranged in an S shape; the present application can fully buffer the pressure of the surrounding rock and provide gradually decreasing supporting force for the surrounding rock, so as to avoid the loose deformation of the surrounding rock, and thus the practicality of the flexible supporting structure is improved.

Description

Technical Field

[0001] This invention relates to the field of tunnel support engineering technology, specifically to flexible support structures and their construction methods. Background Technology

[0002] When constructing highways through mountainous areas, tunnels are typically used. During tunnel excavation, support structures are needed to prevent the collapse of the tunnel walls. These support structures are generally composed of steel arches and shotcrete, and are called rigid support structures. Since shotcrete is a brittle material, when the surrounding rock pressure is too high, the support structure will deform significantly, causing the shotcrete to be compressed and the support to lose its ability to resist the surrounding rock pressure. Therefore, when the surrounding rock pressure is high, a support structure that allows for large deformation without failure is needed. This structure can effectively release the surrounding rock pressure through significant deformation while preventing the shotcrete from being crushed and failing.

[0003] Currently, the common practice is to replace a part of the support structure with flexible nodes, also known as circumferential pressure relief support. However, most existing support structures of this type have the following limitations: First, flexible nodes are difficult to provide large support resistance quickly after construction, leading to uncontrolled loosening and deformation of the surrounding rock; second, flexible nodes generally provide support resistance that gradually increases with increasing compression deformation, resulting in insufficient stress release in the surrounding rock; and third, the design of flexible nodes is relatively complex, making it difficult to promote them on a large scale in engineering projects.

[0004] Therefore, there is an urgent need for a new type of support structure that is simple in construction, can quickly suppress loose deformation of the surrounding rock, and provides support resistance that decreases as the deformation of the surrounding rock increases, in order to address the existing support dilemma. Summary of the Invention

[0005] This invention provides a flexible support structure and its construction method to solve the problems of current flexible support structures being complex in design, unable to quickly suppress loose deformation of surrounding rock after construction, and providing support resistance that decreases as the deformation of surrounding rock increases.

[0006] In a first aspect, the present invention provides a flexible support structure, comprising:

[0007] The support assembly includes a first support member, a plurality of second support members and a third support member, wherein the first support member and the third support member are disposed opposite to each other, all the second support members are disposed between the first support member and the third support member, and any one of the support members extends along the tunnel axis direction;

[0008] A plurality of connecting components, any one of which is disposed between the first support member and the second support member, between the second support member and the third support member, or between two adjacent second support members, and any one of which includes a plurality of deformable members spaced apart along the tunnel axis direction;

[0009] Wherein, any of the deformable members is S-shaped, and any of the deformable members has a deformation state in which they gradually bend under the pressure of the surrounding rock, and a support state in which they are completely bent under the pressure of the surrounding rock. In the deformation state, the deformable member is adapted to provide a continuously decreasing support force to the surrounding rock, and in the support state, the deformable member is adapted to provide a constant support force to the surrounding rock.

[0010] Beneficial effects: By setting deformable members between adjacent support members, the S-shaped deformable members can have both deformable and support states under the pressure of the surrounding rock. When the deformable members are in the deformable state, they can gradually bend to provide a decreasing support force to the surrounding rock, thus effectively buffering the pressure of the surrounding rock. When the deformable members are in the support state, they can provide a constant support force to the surrounding rock, thus providing rigid support and preventing the surrounding rock from loosening and deforming. This improves the practicality of the flexible support structure.

[0011] In one optional embodiment, the deformable component includes a first segment, a second segment, and a third segment connected to each other, wherein the first segment and the second segment, and the second segment and the third segment, are arranged at an angle, the angle ranging from 120° to 150°.

[0012] Beneficial effects: By setting the deformable component to include a first segment, a second segment, and a third segment that are interconnected, with the first segment and the second segment and the third segment both forming an angle, the deformable component can be set in an S-shape. At the same time, the angle range is 120-150°, which allows the deformable component to cope with different surrounding rock pressures. This avoids the deformable component being unable to adequately buffer the surrounding rock pressure when deformed, which could lead to damage to the support component and loss of support capacity of the flexible support structure.

[0013] In one optional embodiment, the thickness of the deformable part varies from 1 to 2 cm, the width varies from 0.25 to 0.35 m, the length of the first segment is the same as the length of the third segment, and the length of the second segment is twice the length of the first segment.

[0014] Beneficial effects: By setting the thickness variation range of the deformable component to 1-2cm and the width variation range to 0.25-0.35m, the structural strength of the deformable component itself can be guaranteed, thus enabling it to cope with different surrounding rock pressures. In addition, by setting the length of the first segment to be the same as that of the third segment and setting the length of the second segment to be twice that of the first segment, the structural strength of the deformable component itself can be further guaranteed, and sufficient distance can be provided for the displacement between adjacent support components. Specifically, the length range of the first segment is 0.15-0.2m.

[0015] In one alternative embodiment, the spacing between two adjacent deformable elements is the same as the length of the second segment.

[0016] Beneficial effect: By setting the interval between adjacent deformable parts to be the same as the length of the second segment, since the length of the second segment is twice the length of the first segment, when the deformable part is in the supported state, the first and third segments will abut against the second segment, and the ends of the second segments of adjacent deformable parts will abut against each other. In this way, interference between the second segments of adjacent deformable parts in the deformed state can be avoided.

[0017] In one alternative embodiment, the connecting assembly further includes at least two connectors, each of which is disposed at both ends of all the deformable members and connected to the ends of all the deformable members, so as to transmit the pressure of the surrounding rock to all the deformable members, and any one of the connectors is adapted to connect to the support member.

[0018] Beneficial effects: By setting the connecting component, two connecting members are also included. In this embodiment, the connecting members are connecting steel plates. The two connecting members are respectively set at both ends of all deformable members and are respectively connected to the ends of all deformable members. Each connecting member can be connected to the support member. Thus, after the connecting component is connected to the adjacent support member, the connecting member can transmit the surrounding rock pressure on the support member to all deformable members, thereby enabling the deformable members to enter the deformation state and the support state.

[0019] In one optional embodiment, the width of the connector is the same as the thickness of the support member, and the width of the connector varies from 0.25 to 0.35 m.

[0020] Beneficial effects: By setting the width of the connector to be the same as the thickness of the support, the connector can perfectly fit the support when connecting the connector and the support, which facilitates welding of the connector and the support. In addition, the width of the connector can vary from 0.25 to 0.35 mm.

[0021] In one alternative embodiment, any of the support members includes at least two steel arches and a filler. The two steel arches are arranged opposite each other to jointly enclose a filling cavity with openings on both sides. The filler is disposed in the filling cavity. When the support member is connected to the connector, the connector blocks the openings on both sides of the filling cavity.

[0022] Beneficial effects: By setting each support member to include two steel arch frames and a filler, the filler in this embodiment is shotcrete. The two steel arch frames are arranged opposite each other to form a filling cavity with openings on both sides. The filler is placed inside the filling cavity. In this way, the support member can provide rigid support for the surrounding rock. In addition, when the support member is connected to the connector, the connector can seal the openings on both sides of the filling cavity, thereby preventing leakage of the filler through the openings.

[0023] In one alternative embodiment, the distance between the two steel arches is configured as an installation unit distance, which varies from 1 to 2 meters, and 10 to 20 of the deformable components are installed within the installation unit distance.

[0024] Beneficial effects: By configuring the distance between the two steel arch frames as the installation unit distance and installing 10-20 deformable components within the installation unit distance, where the installation unit distance varies from 1 to 2 meters, a larger number of deformable components can be installed within the installation unit distance. By specifically installing 10-20 deformable components within the installation unit distance, the connecting assembly can buffer greater surrounding rock pressure, thereby enabling the connecting assembly to cope with different surrounding rock pressures.

[0025] In one alternative implementation, the first segment, the second segment, and the third segment are integrally formed.

[0026] Beneficial effects: By setting the first, second and third sections as an integral molding structure, it is convenient to mass-produce deformable parts. At the same time, the integral molding deformable parts can have greater structural strength, thus enabling the deformable parts to provide greater support.

[0027] Secondly, the present invention also provides a construction method for the aforementioned flexible support structure, comprising the following steps: First, excavating the upper side of the tunnel, installing a first support member and connecting components on both sides of the first support member, welding the steel arch frame of the first support member to the connecting component at the upper end of the connecting component into a whole, and then filling the gap between the steel arch frame and the connecting component with filler; then excavating the middle part of the tunnel, installing the second support members on the left and right sides and the connecting components on both sides of the second support member, welding the upper end of the steel arch frame of the second support member to the connecting component at the lower end of the connecting component on both sides of the first support member, welding the lower end of the steel arch frame to the connecting component at the upper end of the lower connecting component into a whole, and then filling the gap between the steel arch frame and the connecting component with filler; finally, excavating the lower side of the tunnel, installing a third support member, welding the upper end of the steel arch frame of the third support member to the connecting component at the lower end of the connecting component on both sides of the second support member into a whole, and then filling the gap between the steel arch frame and the connecting component with filler; observing the bending condition of the deformable parts, and after the bending deformation stabilizes, if the gap between the deformable parts is not completely compacted, filling the gap with filler. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of a flexible support structure according to an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the connection structure of a flexible support structure according to an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the connection component of a flexible support structure according to an embodiment of the present invention.

[0032] Figure 4 This is a plan view of a connection component of a flexible support structure according to an embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1-Supporting component; 11-First support member; 12-Second support member; 13-Third support member; 131-Steel arch frame; 132-Filling member; 2-Connecting component; 21-Deformable member; 22-Connector. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, 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.

[0036] The following is combined with Figures 1 to 4 The following describes embodiments of the present invention.

[0037] According to embodiments of the present invention, in one aspect, a flexible support structure is provided, such as... Figures 1 to 4 As shown, the system includes a support assembly 1 and several connecting assemblies 2. The support assembly 1 includes a first support member 11, several second support members 12 and a third support member 13. The first support member 11 and the third support member 13 are arranged opposite to each other. All the second support members 12 are arranged between the first support member 11 and the third support member 13. Any support member extends along the tunnel axis. Any connecting assembly 2 is arranged between the first support member 11 and the second support member 12, between the second support member 12 and the third support member 13, or between two adjacent second support members 12. Any connecting assembly 2 includes several deformable members 21 spaced apart along the tunnel axis. Each deformable member 21 is S-shaped. Each deformable member 21 has a deformation state of gradually bending under the pressure of the surrounding rock and a support state of completely bending under the pressure of the surrounding rock. In the deformation state, the deformable member 21 is adapted to provide a continuously decreasing support force to the surrounding rock. In the support state, the deformable member 21 is adapted to provide a constant support force to the surrounding rock.

[0038] The flexible support structure described above uses interconnected support components 1 and several connecting components 2. Each support component 1 includes a first support member 11, several second support members 12, and a third support member 13. The first support member 11 and the third support member 13 are arranged opposite each other, and all the second support members 12 are located between the first support member 11 and the third support member 13. Each support member extends along the tunnel axis, thus providing rigid support to the tunnel through multiple support components 1. Each connecting component 2 is located between the first support member 11 and the second support member 12, between the second support member 12 and the third support member 13, or between two adjacent second support members 12. This allows the connecting component 2 to connect the first support member 11, all the second support members 12, and the third support member 13 together. Furthermore, each connecting component 2 includes several deformable members 21 spaced apart along the tunnel axis. In this embodiment, the deformable members 21 are deformable steel plates, providing flexible connections between adjacent support members.

[0039] Specifically, each deformable component 21 is S-shaped and has both a deformed state and a supported state. In the deformed state, each deformable component 21 can gradually bend under the pressure of the surrounding rock, allowing adjacent supports to move closer to each other as the deformable component 21 gradually bends. This prevents the supports from being directly damaged under the pressure of the surrounding rock and losing their supporting function. In addition, because the deformable component 21 is S-shaped, the gradually bending deformable component 21 can provide a decreasing supporting force to the surrounding rock, thus allowing the deformable component 21 to fully buffer the pressure of the surrounding rock and further prevent damage to the supports.

[0040] In the supported state, each deformable member 21 will be completely bent under the pressure of the surrounding rock, so that adjacent support members can no longer approach each other under the pressure of the surrounding rock, thus enabling the support members to provide rigid support for the surrounding rock and preventing the surrounding rock from loosening and deforming. In addition, after the pressure of the surrounding rock is fully buffered through the deformation state, the fully bent deformable member 21 can provide a constant supporting force for the surrounding rock, thus providing rigid support for the surrounding rock and further preventing the surrounding rock from loosening and deforming.

[0041] It should be noted that when the deformable component 21 is in a deformed state, all the deformable components 21 may have the potential to fully buffer the pressure of the surrounding rock. That is, the deformable component 21 does not have a supported state during construction. At this time, it is necessary to fill the gap between two adjacent deformable components 21 with shotcrete so that the deformable component 21 can provide rigid support and avoid the deformable component 21 from bending after construction, which would cause the surrounding rock to become loose and deformed.

[0042] In summary, by setting the deformable member 21 between adjacent support members, the deformable member 21, being S-shaped, can have both a deformable state and a support state under the pressure of the surrounding rock. When the deformable member 21 is in the deformable state, it can gradually bend to provide a decreasing support force to the surrounding rock, thus effectively buffering the pressure of the surrounding rock. When the deformable member 21 is in the support state, it can provide a constant support force to the surrounding rock, thus providing rigid support and preventing the surrounding rock from loosening and deforming. This improves the practicality of the flexible support structure.

[0043] In one embodiment, such as Figures 2 to 4 As shown, the deformable component 21 includes a first segment, a second segment, and a third segment that are connected to each other. The first segment and the second segment are set at an angle to each other, and the second segment and the third segment are set at an angle ranging from 120° to 150°.

[0044] The flexible support structure described above includes a deformable member 21 consisting of a first section, a second section, and a third section that are interconnected. The first section and the second section are positioned at an angle to each other, and the second section and the third section are positioned at an angle. This allows the deformable member 21 to be S-shaped, with the angle ranging from 120° to 150°. This enables the deformable member 21 to cope with different surrounding rock pressures and prevents it from failing to adequately buffer the surrounding rock pressure during deformation, which could lead to damage to the support and loss of the flexible support structure's support capacity.

[0045] In one embodiment, such as Figures 2 to 4 As shown, the thickness of the deformable part 21 varies from 1 to 2 cm, and the width varies from 0.25 to 0.35 m. The length of the first segment is the same as that of the third segment, and the length of the second segment is twice that of the first segment.

[0046] The flexible support structure described above ensures the structural strength of the deformable member 21 by setting its thickness variation range to 1-2cm and its width variation range to 0.25-0.35m, thus enabling it to withstand different surrounding rock pressures. Furthermore, by setting the length of the first segment to be the same as that of the third segment and setting the length of the second segment to be twice that of the first segment, the structural strength of the deformable member 21 is further ensured, and sufficient distance is provided for displacement between adjacent support members. Specifically, the length of the first segment ranges from 0.15 to 0.2m.

[0047] In one embodiment, such as Figures 2 to 4 As shown, the spacing between two adjacent deformable parts 21 is the same as the length of the second segment.

[0048] The flexible support structure described above sets the spacing between adjacent deformable members 21 to be the same as the length of the second segment. Since the length of the second segment is twice the length of the first segment, when the deformable member 21 is in the supported state, the first and third segments will abut against the second segment, and the ends of the second segments of adjacent deformable members 21 will abut against each other. In this way, interference between the second segments of adjacent deformable members 21 in the deformed state can be avoided.

[0049] In one embodiment, such as Figures 2 to 4 As shown, the connecting assembly 2 also includes at least two connectors 22, which are respectively disposed at both ends of all deformable members 21 and connected to the ends of all deformable members 21, so as to transmit the pressure of the surrounding rock to all deformable members 21. Any connector 22 is adapted to be connected to the support member.

[0050] The flexible support structure described above also includes two connectors 22 by setting the connecting component 2. In this embodiment, the connectors 22 are connecting steel plates. The two connectors 22 are respectively set at both ends of all deformable members 21 and are respectively connected to the ends of all deformable members 21. Each connector 22 can be connected to the support member. Thus, after the connecting component 2 is connected to the adjacent support member, the connector 22 can transmit the surrounding rock pressure on the support member to all deformable members 21, thereby enabling the deformable members 21 to enter the deformation state and the support state.

[0051] In one embodiment, such as Figure 2 As shown, the width of the connector 22 is the same as the thickness of the support, and the width of the connector 22 varies from 0.25 to 0.35 m.

[0052] The flexible support structure described above, by setting the width of the connector 22 to be the same as the thickness of the support, allows the connector 22 to perfectly fit the support when connecting the connector 22 and the support, thus facilitating welding of the connector 22 and the support. In addition, the width of the connector 22 varies from 0.25 to 0.35 m.

[0053] In one embodiment, such as Figure 2 As shown, any support member includes at least two steel arch frames 131 and a filler 132. The two steel arch frames 131 are arranged opposite each other to jointly enclose a filling cavity with openings on both sides. The filler 132 is disposed in the filling cavity. When the support member is connected to the connector 22, the connector 22 blocks the openings on both sides of the filling cavity.

[0054] The flexible support structure described above includes two steel arch frames 131 and a filler 132 in each support member. In this embodiment, the filler 132 is shotcrete. The two steel arch frames 131 are arranged opposite each other to form a cavity with openings on both sides. The filler 132 is placed inside the cavity. This allows the support member to provide rigid support for the surrounding rock. In addition, when the support member is connected to the connector 22, the connector 22 can seal the openings on both sides of the cavity, thereby preventing leakage of the filler 132 through the openings.

[0055] In one embodiment, such as Figure 2 As shown, the distance between the two steel arch frames 131 is configured as the installation unit distance, which varies from 1 to 2 m. Within the installation unit distance, 10 to 20 deformable parts 21 are installed.

[0056] The flexible support structure described above configures the distance between the two steel arch frames 131 as the installation unit distance and installs 10-20 deformable members 21 within the installation unit distance. The installation unit distance varies from 1 to 2 meters, which allows for the installation of a larger number of deformable members 21 within the installation unit distance. By specifically installing 10-20 deformable members 21 within the installation unit distance, the connecting component 2 can buffer greater surrounding rock pressure, thereby enabling the connecting component 2 to cope with different surrounding rock pressures.

[0057] In one embodiment, such as Figures 2 to 4 As shown, the first, second, and third sections are a single-piece molded structure.

[0058] The flexible support structure described above, by setting the first section, the second section and the third section as an integrally formed structure, facilitates the mass production of the deformable part 21. At the same time, the integrally formed deformable part 21 can have greater structural strength, thereby enabling the deformable part 21 to provide greater support force.

[0059] According to an embodiment of the present invention, another aspect provides a construction method applied to the above-mentioned flexible support structure, comprising the following steps: First, excavating the upper side of the tunnel, installing the first support member 11 and the connecting components 2 on both sides of the first support member 11, welding the steel arch frame 131 of the first support member 11 to the connecting component 22 at the upper end of the connecting component 2 to form a whole, and then filling the gap between the steel arch frame 131 and the connecting component 22 with the filler 132; then excavating the middle part of the tunnel, installing the second support member 12 on the left and right sides and the connecting components 2 on both sides of the second support member 12, the upper end of the steel arch frame 131 of the second support member 12 and the lower end of the connecting components 2 on both sides of the first support member 11. The connecting parts 22 are welded together. The lower end of the steel arch frame 131 is welded to the upper end of the connecting parts 22 of the lower connecting component 2 to form a whole. Then, the gap between the steel arch frame 131 and the connecting parts 22 is filled with filler 132. Finally, the lower side of the tunnel is excavated, and the third support 13 is installed. The upper end of the steel arch frame 131 of the third support 13 is welded to the lower end of the connecting parts 22 of the connecting components 2 on both sides of the second support 12 to form a whole. Then, the gap between the steel arch frame 131 and the connecting parts 22 is filled with filler 132. The bending condition of the deformable parts 21 is observed. After the bending deformation is stable, if the gap between the deformable parts 21 is not completely compacted, the gap is filled with filler 132.

[0060] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A flexible support structure, characterized in that, include: The support assembly (1) includes a first support member (11), a plurality of second support members (12) and a third support member (13). The first support member (11) and the third support member (13) are arranged opposite to each other. All the second support members (12) are arranged between the first support member (11) and the third support member (13). Any of the support members extends along the tunnel axis. A plurality of connecting components (2), any one of the connecting components (2) is disposed between the first support member (11) and the second support member (12), between the second support member (12) and the third support member (13) or between two adjacent second support members (12), and any one of the connecting components (2) includes a plurality of deformable members (21) spaced apart along the tunnel axis. In this embodiment, any of the deformable members (21) is arranged in an S-shape, and any of the deformable members (21) has a deformation state in which it gradually bends under the pressure of the surrounding rock, and a support state in which it is completely bent under the pressure of the surrounding rock. In the deformation state, the deformable member (21) is adapted to provide a continuously decreasing support force to the surrounding rock, and in the support state, the deformable member (21) is adapted to provide a constant support force to the surrounding rock. The deformable component (21) includes a first segment, a second segment, and a third segment that are connected to each other. The first segment and the second segment, as well as the second segment and the third segment, are set at an angle, and the angle varies from 120° to 150°. The connecting assembly (2) further includes at least two connectors (22), which are respectively disposed at both ends of all the deformable members (21) and respectively connected to the ends of all the deformable members (21) to transmit the pressure of the surrounding rock to all the deformable members (21), and any one of the connectors (22) is adapted to be connected to the support member; Each of the support members includes at least two steel arch frames (131) and a filler (132). The two steel arch frames (131) are arranged opposite each other to jointly enclose a filling cavity with openings on both sides. The filler (132) is disposed in the filling cavity. When the support member is connected to the connector (22), the connector (22) blocks the openings on both sides of the filling cavity.

2. The flexible support structure according to claim 1, characterized in that, The thickness of the deformable part (21) varies from 1 to 2 cm, and the width varies from 0.25 to 0.35 m. The length of the first segment is the same as the length of the third segment, and the length of the second segment is twice the length of the first segment.

3. The flexible support structure according to claim 2, characterized in that, The spacing between two adjacent deformable parts (21) is the same as the length of the second segment.

4. The flexible support structure according to claim 3, characterized in that, The width of the connector (22) is the same as the thickness of the support member, and the width of the connector (22) varies from 0.25 to 0.35 m.

5. The flexible support structure according to claim 4, characterized in that, The distance between the two steel arch frames (131) is configured as the installation unit distance, which varies from 1 to 2 m, and 10 to 20 of the deformable parts (21) are installed within the installation unit distance.

6. The flexible support structure according to claim 5, characterized in that, The first segment, the second segment, and the third segment are integrally formed.

7. A construction method applied to the flexible support structure according to any one of claims 1-6, characterized in that, Includes the following steps: First, excavate the upper side of the tunnel and install the first support member (11) and the connecting components (2) on both sides of the first support member (11). The steel arch frame (131) of the first support member (11) is welded to the connecting component (22) at the upper end of the connecting component (2) to form a whole. Then, fill the gap between the steel arch frame (131) and the connecting component (22) with filler (132). Then, excavate the middle part of the tunnel and install the second support member (12) on the left and right sides and the connecting components (2) on both sides of the second support member (12). The upper end of the steel arch frame (131) of the second support member (12) is welded to the connecting component (22) at the lower end of the connecting component (2) on both sides of the first support member (11). The lower end of the steel arch frame (131) is connected to the lower side. The upper part of the connecting component (22) of the connecting component (2) is welded into a whole, and the gap between the steel arch frame (131) and the connecting component (22) is filled with filler (132); finally, the lower side of the tunnel is excavated and the third support (13) is installed. The upper part of the steel arch frame (131) of the third support (13) is welded into a whole with the lower part of the connecting component (22) of the connecting component (2) on both sides of the second support (12), and the gap between the steel arch frame (131) and the connecting component (22) is filled with filler (132); observe the bending condition of the deformable part (21). After the bending deformation is stable, if the gap between the deformable parts (21) is not completely compacted, filler (132) is used to fill the gap.

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