Tunnel corrugated plate active supporting structure and construction method thereof

Abstract

The application discloses a tunnel corrugated plate active supporting structure, which comprises corrugated plate pieces, connecting pieces and temporary supports, the supporting structure is divided into upper steps and lower steps, the corrugated plate pieces are arranged on tunnel vaults, upper step and lower step working faces, the corrugated plate pieces are connected through the connecting pieces, the temporary supports are arranged between the upper steps and the lower steps, and the two ends of the temporary supports are connected with the corrugated plate pieces of the lower steps. The length of the temporary supports can be appropriately increased, the corrugated plate pieces of the lower steps can apply a pushing force to the corrugated plate pieces of the upper steps, and then the corrugated plate pieces of the steps can be actively close to and extrude the surrounding rock, so that the supporting force is actively provided to the surrounding rock before the surrounding rock is deformed, and the early deformation of the surrounding rock is actively controlled. The application further discloses a construction method of the tunnel corrugated plate active supporting structure.

Description

Technical Field

[0001] This invention belongs to the field of tunnel engineering technology, specifically relating to a tunnel corrugated plate active support structure and its construction method. Background Technology

[0002] Corrugated steel plate support for tunnels is a new type of support structure that uses prefabricated assembled corrugated steel plates to provide continuous and comprehensive support for tunnels. Due to its advantages such as continuous support, high longitudinal stiffness, and good toughness, its application in the initial support of traffic tunnels in environments with large deformation in soft rock and water abundance is gradually increasing.

[0003] The mainstream connection method for corrugated steel plate components is bolt connection. For example: CN203452799U describes a corrugated steel plate tunnel support structure, requiring adjacent steel plates to be connected by bolts. CN110219680A describes a large-span corrugated steel arch support structure, requiring the plates to be anchored together by high-strength bolts to form an arch structure. CN114622931A describes a joint structure and construction method for corrugated steel plate support structures in tunnels, requiring the joints to be interconnected by bolted connectors and strip-shaped mounting holes, meaning that the corrugated plate units can move freely between each other. CN214464249U requires adjacent corrugated steel plates to be connected together by splice plates, and the splice plates and corrugated plates are lapped together by high-strength bolts.

[0004] Problems: Corrugated sheets are mostly connected by high-strength bolts. While the principle seems simple and the operation convenient, the site conditions and equipment available during tunnel construction are very limited. Furthermore, the corrugated sheet components often weigh over 500 kg, leading to construction difficulties and making precise lifting and positioning impossible. This results in pre-drilled bolt holes between adjacent sheets not being precisely aligned. Connecting sheets are often linked by a row of high-strength bolts. If any bolt hole has a machining deviation, or if the corrugated sheet is not properly lifted on-site, the bolt becomes difficult to install, requiring on-site hole enlargement or even re-drilling, severely impacting construction progress.

[0005] Corrugated plate support, as a type of tunnel steel support, belongs to the "passive support" category, just like traditional steel profiles. It suffers from a delayed support effect—corrugated plate components are difficult to fit tightly against the surrounding rock. Even with backfilling to connect with the surrounding rock, the corrugated plate can only provide support through the reaction force of its contact surface after the surrounding rock deforms inwards into the tunnel and compresses the corrugated plate to a certain extent. In tunnels with loose or layered surrounding rock, "passive support" components, unable to provide timely support, can easily induce small deformations in the surrounding rock to develop into large deformations, ultimately leading to support failure. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a simple, convenient, and easy-to-operate active support structure for tunnel corrugated plates. This active support structure can actively adhere to and compress the surrounding rock, providing support force to the surrounding rock before it undergoes convergence deformation, thereby playing a role in actively controlling the early deformation of the surrounding rock.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows: a tunnel corrugated plate active support structure, comprising corrugated plate components, connectors, and temporary supports. The support structure is divided into an upper step and a lower step. Corrugated plate components are laid on the tunnel arch, the working face of the upper step, and the lower step. The corrugated plate components are connected to each other by connectors. The temporary supports are set between the upper step and the lower step, and the two ends of the temporary supports are connected to the corrugated plate components of the lower step.

[0008] Furthermore, the corrugated plate includes plate A, plate B1, plate B2, plate C1 and plate C2. Plate A is disposed at the tunnel arch, plates B1 and B2 are symmetrically disposed on both sides of plate A, plates B1 and B2 are located at the working face of the upper step, and plates C1 and C2 are symmetrically disposed at the working face of the lower step.

[0009] Furthermore, the corrugated plate also includes a D plate, which is disposed at the inverted arch. One end of the D plate is connected to the lower end of the C1 plate, and the other end of the D plate is connected to the lower end of the C2 plate.

[0010] Furthermore, the connector includes a movable connector and a fixed connector. Plates A, B1, B2, C1, and C2 are connected by the movable connector, and plates C1, D, and C2 are connected by the fixed connector.

[0011] Furthermore, the movable connector includes movable connector I, movable connector II, movable connector III, and movable connector IV. One end of plate A is connected to the upper end of plate B1 via movable connector I, the other end of plate A is connected to the upper end of plate B2 via movable connector II, the lower end of plate B1 is connected to the upper end of plate C1 via movable connector III, and the end of plate B2 is connected to the upper end of plate C2 via movable connector IV.

[0012] Furthermore, the movable connectors I, II, III, and IV have the same structure, each including bolts, positioning hinges, and nuts. The two corrugated plates connected to each other are plate I and plate II, respectively. Plate I overlaps with plate II and bolt holes are provided at the overlap. The bolts pass through plate I, plate II, and positioning hinges in sequence and are fastened by nuts.

[0013] Furthermore, the positioning hinge includes an upper hinge and a lower hinge, which are connected by a hinge. The upper hinge is firmly welded to plate I, the lower hinge is firmly welded to plate II, and the bolt is firmly welded to plate I.

[0014] Furthermore, the fixing connector includes fixing connector I and fixing connector II. One end of plate D is connected to the lower end of plate C1 through fixing connector I, and the other end of plate D is connected to the lower end of plate C2 through fixing connector II.

[0015] Furthermore, the temporary support has reserved bolt holes at both ends. The temporary support is temporarily connected to the lower ends of plates C1 and C2 by bolts, so that the corrugated plate support structure of the upper step is closed into a ring. The length of the temporary support is designed according to the distance between plates C1 and C2 and the magnitude of the support force that the temporary support needs to apply to plates C1 and C2.

[0016] This invention also provides a construction method for a tunnel corrugated plate active support structure. Based on the above-mentioned tunnel corrugated plate active support structure, the method includes the following steps:

[0017] The construction method includes the following steps:

[0018] S1. Panel assembly trial: Use connectors to assemble the panels into a complete ring support structure. Conduct an overall inspection of the support structure. After the inspection is qualified, weld the upper hinge, lower hinge, and bolts of the movable connector to the corresponding positions of the panel and remove all nuts.

[0019] S2. Plate Transportation: Fold plates B and C in a horizontal position and temporarily bind them together with cable ties; after hoisting the entire structure, use a loader to lift plate A, while plates B and C hang freely. The loader will then lift the plate to the working face.

[0020] S3. Installation of corrugated plate on the upper step: Remove the temporary binding straps between plate B and plate C, use a loader and manual labor to install the corrugated plate to the design position, and tighten the nuts of movable connector I and movable connector II; connect the lower ends of plate C1 and plate C2 to the two ends of the temporary support; then grout the back of the corrugated plate wall through the reserved grouting / venting holes;

[0021] S4. Installation of corrugated plate on lower step: Remove temporary supports, push C1 plate and C2 plate to the design position, install anchor pipes, further connect C1 plate and C2 plate to the surrounding rock, and grout behind the corrugated plate wall through the reserved grouting holes;

[0022] S5. Installation of Corrugated Plate for Invert Arch: After the invert arch is excavated, the D plate is hoisted to the design position, and nuts are used to quickly connect both ends of the D plate to the C1 plate and C2 plate respectively. Finally, the invert arch is poured.

[0023] The advantages of using the technical solution of this invention are:

[0024] This invention eliminates the need for a dedicated temporary inverted arch on the upper step. The corrugated plate components of the lower step, combined with temporary supports, constitute the temporary inverted arch. This allows the upper step support structure to close into a ring in a timely manner, which is beneficial for improving the load-bearing capacity of the corrugated plate support structure on the upper step. Furthermore, the length of the temporary supports can be appropriately increased, and the corrugated plate components of the lower step can apply thrust to the corrugated plate components of the upper step. This allows the corrugated plate components of the step to actively adhere to and compress the surrounding rock, providing support force to the surrounding rock before it undergoes convergence deformation, thereby actively controlling the early deformation of the surrounding rock. Attached Figure Description

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0026] Figure 1 This is a schematic diagram showing the distribution of the corrugated plate components and connectors of the present invention;

[0027] Figure 2 This is a schematic diagram illustrating the temporary support used in this invention;

[0028] Figure 3 This is an exploded view of the movable connector of the present invention;

[0029] Figure 4 This is a schematic diagram illustrating the working principle of the movable connector of the present invention;

[0030] Figure 5 This is a schematic diagram of the trial assembly of the plates during the construction of the support structure of the present invention;

[0031] Figure 6 This is a schematic diagram of the plate transportation during the construction of the support structure of the present invention;

[0032] Figure 7 This is a schematic diagram of the installation of the corrugated plate on the upper step during the construction of the support structure of the present invention;

[0033] Figure 8 This is a schematic diagram of the installation of the corrugated plate on the lower step during the construction of the support structure of the present invention;

[0034] Figure 9 This is a schematic diagram of the installation of the corrugated plate of the inverted arch during the construction of the support structure of the present invention.

[0035] The markings in the above figure are as follows: 1. Upper step; 2. Lower step; 3. Temporary support; 4. D plate; 5. Bolt; 6. Locating hinge; 7. Nut; 8. Plate I; 9. Plate II; 10. Locking foot anchor pipe. Detailed Implementation

[0036] In this invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "planar direction," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the invention.

[0037] like Figures 1 to 5 As shown, a tunnel corrugated plate active support structure includes corrugated plate components, connectors, and temporary supports 3. The support structure is divided into an upper step 1 and a lower step 2. Corrugated plate components are laid on the tunnel arch, the working face of the upper step 1, and the lower step 2. The corrugated plate components are connected by connectors. The temporary supports 3 are set between the upper step 1 and the lower step 2, and both ends of the temporary supports 3 are connected to the corrugated plate components of the lower step 2. In this invention, the upper step does not require a specially constructed temporary inverted arch. The corrugated plate components of the lower step 2 plus the temporary supports constitute a temporary inverted arch, thereby enabling the upper step support structure to close into a loop in time, which is beneficial to improving the bearing capacity of the upper step corrugated plate support structure. Moreover, the length of the temporary supports can be appropriately increased, and the corrugated plate components of the lower step 2 can apply thrust to the corrugated plate components of the upper step 1, thereby enabling the corrugated plate components of the lower step 1 to actively adhere to and compress the surrounding rock, actively providing support force to the surrounding rock before the surrounding rock undergoes convergence deformation, thus playing a role in actively controlling the early deformation of the surrounding rock.

[0038] The corrugated plate components include plate A11, plate B112, plate B213, plate C121, and plate C222. Plate A11 is located at the tunnel arch. Plates B112 and B213 are symmetrically located on both sides of plate A11, situated at the working face of the upper step. Plates C121 and C222 are symmetrically located at the working face of the lower step. Plates B112 and B213 can be collectively referred to as plate B, and plates C112 and C222 can be collectively referred to as plate C. The corrugated plate components also include plate D4, which is located at the invert arch. One end of plate D4 is connected to the lower end of plate C121, and the other end of plate D4 is connected to the lower end of plate C22.

[0039] Specifically, corrugated steel plate components. These include plate A for the tunnel arch, plates B1 and B2 for the upper steps, and plates C1 and C2 for the lower steps. If an invert arch is necessary, plate D for the invert arch is also included. The length and curvature of each plate are determined based on the tunnel design outline and step height, and they are made of corrugated steel plates.

[0040] The connectors include movable connectors and fixed connectors. Plates A11, B112, B213, C121, and C22 are connected by movable connectors, while plates C121, D4, and C22 are connected by fixed connectors.

[0041] The movable connectors include movable connector IK1, movable connector IIK2, movable connector IIIK3, and movable connector IVK4. One end of plate A11 is connected to the upper end of plate B112 via movable connector IK1, and the other end of plate A11 is connected to the upper end of plate B213 via movable connector IIK2. The lower end of plate B112 is connected to the upper end of plate C121 via movable connector IIIK3, and the end of plate B213 is connected to the upper end of plate C22 via movable connector IVK4. The fixed connectors include fixed connector IK5 and fixed connector IIK6. One end of plate D4 is connected to the lower end of plate C121 via fixed connector IK5, and the other end of plate D4 is connected to the lower end of plate C22 via fixed connector IIK6.

[0042] Movable connectors IK1, IIK2, IIIK3, and IVK4 have the same structure, all including bolts 5, positioning hinges 6, and nuts 7. The two corrugated plates connected to each other are plate I8 and plate II9, which overlap with each other and have bolt holes at the overlap. Bolts 5 pass through plate I8, plate II9, and positioning hinge 6 in sequence and are secured with nuts 7. Positioning hinge 6 includes an upper hinge 61 and a lower hinge 62, which are hinged together. The upper hinge 61 is firmly welded to plate I8, and the lower hinge 62 is firmly welded to plate II9. Bolts 5 are also firmly welded to plate I8. Fixed connections only include bolts and nuts.

[0043] There are four movable connectors: IK1, IIK2, IIIK3, and IVK4, located at the connection between the top plate A and the upper step plate B, and the connection between the upper and lower steps, respectively. Each connector consists of a positioning hinge, a nut, and a bolt. There are two fixed connectors: IK5 and IIK6, located at the connection between the lower step plate C and the inverted arch plate D. Each fixed connector consists only of a nut and a bolt.

[0044] Working principle of the movable connector: ① Plate I8 and Plate II9 overlap, with bolt holes at the overlap. First, use bolts and nuts to temporarily connect and fix Plate I8, Plate II9, and the positioning hinge; ② Weld the upper hinge of the positioning hinge firmly to Plate I8, weld the lower hinge of the positioning hinge firmly to Plate II9, and weld the bolts firmly to Plate I8; ③ Unscrew the nuts, and Plate II9 can rotate around Plate I8 to achieve a folded state; ④ After Plate 2 is unfolded, Plate I8 and Plate II9 can be reconnected and secured by tightening the nuts.

[0045] The temporary support 3 has reserved bolt holes at both ends. The temporary support 3 is temporarily connected to the lower ends of plate C1 21 and plate C2 22 by bolts, so that the corrugated plate support structure of the upper step is closed into a ring. The length of the temporary support 3 is designed according to the distance between plate C1 21 and plate C2 22 and the magnitude of the support force that the temporary support needs to apply to plate C1 21 and plate C2 22.

[0046] The functions of temporary supports are: ① During the stepped construction method, when plates C1 and C2 are placed at the temporary invert arch of the upper step, temporary supports are installed between the two plates, allowing the corrugated plate support structure of the upper step to temporarily close into a ring. ② The length of the temporary supports depends on the distance between plates C1 and C2, and the magnitude of the support force that the temporary supports intend to apply to plates C1 and C2. For example, appropriately increasing the length of the temporary supports allows the C plate to exert a thrust on plate B, enabling plate B to actively adhere to and compress the surrounding rock, providing support force to the surrounding rock before it undergoes convergence deformation, thereby actively controlling the early deformation of the surrounding rock.

[0047] The active support structure of the corrugated plate tunnel of the present invention is applicable to tunnels using the two-stage excavation method—first, the upper stage face is excavated to support the surrounding rock; then, the lower stage face is excavated to support the surrounding rock. If necessary, an invert arch must also be excavated and support constructed at the invert arch.

[0048] Based on the above-mentioned active support structure for tunnel corrugated plates, the present invention also provides a construction method for the active support structure for tunnel corrugated plates, which includes the following steps:

[0049] S1. Trial assembly of panels:

[0050] ① In an open area, using connectors, assemble the plates into a complete ring support structure while lying down. Only tighten the bolts during assembly; do not weld. ② After assembly, conduct an overall inspection in either a lying or suspended position until the inspection is passed. ③ While lying down, weld the upper and lower hinges and bolts of movable connectors IK1, IIK2, IIIK3, and IVK4 to their corresponding positions on the plates. Only weld the bolts of fixed connectors IK5 and IIK6 to their corresponding positions on plate C. ④ Finally, remove all nuts.

[0051] S2. Panel Transportation:

[0052] Fold plates B and C in a horizontal position and temporarily bind them together with cable ties; after hoisting the entire structure, use a loader to lift plate A, while plates B and C hang freely. The loader then lifts the plate to the working face.

[0053] S3. Installation of corrugated sheet on upper step:

[0054] ① After the upper step excavation is completed, remove the temporary binding straps between plates B and C, and use a loader and manual labor to install the corrugated plate to the designed position, and tighten the nuts of movable connector IK1 and movable connector IIK2; ② Quickly connect the lower ends of plates C1 and C2, which have been welded with bolts, to the two ends of the temporary supports with pre-drilled bolt holes with nuts, so that the upper step corrugated plate closes into a ring to ensure the load-bearing capacity is exerted; ③ Install anchor pipe 10 at the pre-drilled hole at the lower end of plate B to further connect plate B to the surrounding rock; ④ If necessary, anchor bolts 101 can be further installed at other pre-drilled holes on plates A and B to further fix the corrugated plate to the surrounding rock. ⑤ First, seal the gap between the edge of the upper step corrugated plate and the surrounding rock with materials such as airbags, heavy sponges, and rubber. Then, seal the excess reserved holes on the surface of plate A and plate B. Finally, grout the corrugated plate wall through the reserved grouting / venting holes. The grout can be cement (sand) grout, micro-expansion grouting material, concrete, etc.

[0055] S4. Installation of corrugated sheet on lower step:

[0056] ① After the lower step excavation is completed, loosen the nuts at both ends of the temporary support to remove the temporary support, push the C-plate to the designed position, and tighten the nuts of movable connectors ⅢK3 and ⅣK4; ② Install the locking anchor pipe 10 at the reserved hole position at the lower end of the C-plate to further connect the C-plate to the surrounding rock; ③ If necessary, anchor rods 101 can be further installed at other reserved hole positions on the C-plate to further fix the C-plate to the surrounding rock; ④ First, seal the gap between the edge of the C-plate and the surrounding rock with materials such as air bags, heavy sponges, and rubber, then seal the excess drill holes on the surface of the C-plate, and finally grout the corrugated plate wall through the reserved grouting holes; the grout can be cement (sand) grout, micro-expansion grouting material, concrete, etc.

[0057] S5. Installation of corrugated sheet for inverted arch:

[0058] After the invert arch is excavated, the D plate is hoisted to the design position, and nuts are used to quickly connect both ends of the D plate to the C1 plate and C2 plate respectively. Finally, the invert arch is poured.

[0059] Special instructions for construction methods:

[0060] 1. When the tunnel does not have an invert arch, i.e. without D slab—after the C1 and C2 slabs are installed, not only should anchor pipes be installed to connect the C1 and C2 slabs to the surrounding rock, but angle steel or concrete foundations should also be added at their lower ends to prevent the C slabs from settling as a whole.

[0061] 2. When the construction method is changed from step method to full-section construction, the steps of installing and removing temporary supports need to be omitted. After removing the temporary binding straps between B plate and C plate, use a loader and manual labor to install A plate, B plate and C plate into the design position at one time. Then, install all the nuts of movable connector IK1, movable connector IIK2, movable connector IIIK3 and movable connector IVK4, and finally carry out other work steps.

[0062] For plate connections requiring lifting operations, this invention incorporates movable connectors. The locating hinges in these connectors serve a dual function: a rotary connection and a locating screw hole. The C-plate can act as a temporary inverted arch for the upper step, with an adjustable temporary support length. Together, these components create a closed loop for the upper step support structure. Furthermore, this invention provides a complete construction method for corrugated plate support, encompassing overall lifting, transportation, and installation. The only large construction equipment required is a loader, making operation simple and cost-effective.

[0063] For the upper corrugated plate structure, this invention features a movable connector, and the positioning hinge is welded to the plate only after trial assembly to ensure accuracy. Therefore, the positional relationship of the bolt holes between adjacent plates is defined before construction. Thus, bolts can be smoothly installed and tightened without the need for precise lifting of heavy plates during construction. This completely solves the current construction problems caused by misaligned bolt holes, which require enlarging holes, opening new holes, or even making installation impossible. It significantly reduces assembly difficulty and improves construction efficiency.

[0064] Because the upper corrugated plate structure is temporarily connected by hinges to form an integral structure, it can be transported and assembled as a whole using a loader. Compared with the traditional construction method of transporting in sections, setting up on-site scaffolding, lifting and assembling one piece at a time, and relying mainly on workers to carry the load, this patented method greatly improves construction efficiency, reduces labor intensity, and improves construction safety.

[0065] This invention eliminates the need for a dedicated temporary inverted arch on the upper step; the C-plate and temporary supports constitute the temporary inverted arch, allowing the upper step support structure to close into a ring in a timely manner, thus improving the load-bearing capacity of the corrugated plate support structure. It also increases the length and stiffness of the temporary supports, thereby applying thrust to the B-plate through the C-plate. This enables the B-plate to actively adhere to and compress the surrounding rock, providing support before the surrounding rock converges and deforms. This approach overturns the concept of steel frames as passive supports, prompting the corrugated plate support structure to actively control small deformations in the early stages and prevent the induction of large deformations, which is of great significance.

[0066] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the technical solution of the present invention, or the direct application of the concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A tunnel corrugated plate active support structure, characterized in that: The support structure includes corrugated plate components, connectors, and temporary supports (3). The support structure is divided into an upper step (1) and a lower step (2). Corrugated plate components are laid on the tunnel arch, the working face of the upper step (1), and the lower step (2). The corrugated plate components are connected by connectors. The temporary supports (3) are set between the upper step (1) and the lower step (2). The two ends of the temporary supports (3) are connected to the corrugated plate components of the lower step (2). The corrugated plate components include plate A (11), plate B1 (12), plate B2 (13), plate C1 (21), and plate C2 (22). Plate A (11) Set on the tunnel arch, plates B1 (12) and B2 (13) are symmetrically arranged on both sides of plate A (11). Plates B1 (12) and B2 (13) are located on the working face of the upper step, and plates C1 (21) and C2 (22) are symmetrically arranged on the working face of the lower step. The temporary support (3) has reserved bolt holes at both ends. The temporary support (3) is temporarily connected to the lower end of plates C1 (21) and C2 (22) by bolts. The corrugated plate of the lower step and the temporary support constitute a temporary inverted arch, so that the corrugated plate support structure of the upper step is closed into a ring. The length of the temporary support (3) is rooted in the tunnel arch. The design is based on the distance between plate C1 (21) and plate C2 (22) and the magnitude of the supporting force that the temporary support needs to apply to plate C1 (21) and plate C2 (22); the connectors include movable connectors, which include movable connector I (K1), movable connector II (K2), movable connector III (K3) and movable connector IV (K4), all of which have the same structure and include bolts (5), positioning hinges (6) and nuts (7). The two corrugated plate pieces that are connected to each other are plate I (8) and plate II (9), and plate I (8) overlaps with plate II (9) and the overlap is provided with There are bolt holes, and the bolt (5) passes through plate I (8), plate II (9), and positioning hinge (6) in sequence and is fastened by nut (7); the positioning hinge (6) includes an upper hinge (61) and a lower hinge (62), the upper hinge (61) and the lower hinge (62) are connected by hinge, the upper hinge (61) is firmly welded to plate I (8), the lower hinge (62) is firmly welded to plate II (9), and the bolt (5) is firmly welded to plate I (8); the A plate (11), B1 plate (12), B2 plate (13), C1 plate (21), and C2 plate (22) are connected by movable connectors.

2. The active support structure for a tunnel corrugated plate as described in claim 1, characterized in that: The corrugated plate also includes a D plate (4), which is located at the inverted arch. One end of the D plate (4) is connected to the lower end of the C1 plate (21), and the other end of the D plate (4) is connected to the lower end of the C2 plate (22).

3. The active support structure for a tunnel corrugated plate as described in claim 2, characterized in that: The connector also includes a fixing connector, and the C1 plate (21), D plate (4), and C2 plate (22) are connected by the fixing connector.

4. The active support structure for a tunnel corrugated plate as described in claim 3, characterized in that: One end of plate A (11) is connected to the upper end of plate B1 (12) via movable connector I (K1), the other end of plate A (11) is connected to the upper end of plate B2 (13) via movable connector II (K2), the lower end of plate B1 (12) is connected to the upper end of plate C1 (21) via movable connector III (K3), and the lower end of plate B2 (13) is connected to the upper end of plate C2 (22) via movable connector IV (K4).

5. The active support structure for a tunnel corrugated plate as described in claim 4, characterized in that: The fixed connectors include fixed connector I (K5) and fixed connector II (K6). One end of plate D (4) is connected to the lower end of plate C1 (21) through fixed connector I (K5), and the other end of plate D (4) is connected to the lower end of plate C2 (22) through fixed connector II (K6).

6. A construction method for a tunnel corrugated plate active support structure, characterized in that: Based on the active support structure for a tunnel corrugated plate according to any one of claims 1 to 5, the construction method includes the following steps: S1. Panel assembly trial: Use connectors to assemble the panels into a complete ring support structure. Conduct an overall inspection of the support structure. After the inspection is qualified, weld the upper hinge, lower hinge, and bolts of the movable connectors to the corresponding positions on the panels, and remove all nuts. S2. Plate transportation: Fold plates B and C in a horizontal position and temporarily tie them together with cable ties; after hoisting the entire structure, use a loader to lift plate A, while plates B and C hang freely and are lifted to the working face by the loader; S3. Installation of corrugated plate on the upper step: Remove the temporary binding straps between plate B and plate C, use a loader and manual labor to install the corrugated plate to the design position, and tighten the nuts of movable connector I (K1) and movable connector II (K2); connect the lower ends of plate C1 (21) and plate C2 (22) to the two ends of the temporary support (3); then grout the corrugated plate wall through the reserved grouting holes; S4. Installation of corrugated plate on lower step: Remove temporary support, push C1 plate (21) and C2 plate (22) to the design position, install anchor pipe, connect C1 plate (21) and C2 plate (22) to the surrounding rock, and grout the corrugated plate wall through the reserved grouting hole; S5. Installation of corrugated plate for invert arch: After the invert arch is excavated, the D plate is hoisted to the design position, and the two ends of the D plate are quickly connected to the C1 plate (21) and the C2 plate (22) respectively using nuts. Finally, the invert arch is poured.

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