A prestressed corrugated slab cavity reinforcement structure

Abstract

This utility model discloses a prestressed corrugated plate tunnel reinforcement structure, which is installed along the circumference of the tunnel wall on the inner side of the tunnel. It includes a prestressed corrugated plate system, a concrete system, an anchoring system, and a load-bearing base located at the bottom of the tunnel. The prestressed corrugated plate system comprises multiple corrugated plate units connected sequentially along the circumference of the tunnel. The corrugated plate units have a continuous waveform in the connection direction and form continuous trough lines on the wall-attached side. Prestressed steel cables are installed along the continuous trough lines, fixed by the anchoring system and under prestressed tension. The concrete system includes a backfill layer of concrete between the corrugated plate units and the tunnel wall. The load-bearing base includes a concrete invert or abutment. This utility model establishes a circumferential prestressed wall-attached reinforcement structure around the tunnel wall, suppressing the opening of the joints on the wall-attached side of the corrugated plates and improving the overall stiffness of the reinforcement structure. This utility model is applicable to the support of newly constructed tunnels and the reinforcement of existing tunnels.

Description

Technical Field

[0001] This utility model relates to the field of tunnel support and reinforcement engineering, specifically to a prestressed corrugated plate tunnel reinforcement structure and its reinforcement method. Background Technology

[0002] A tunnel is an underground or semi-underground space structure enclosed by surrounding rock or artificial structures. Typical examples include highway and railway tunnels, urban utility tunnels, pipe jacking and culverts, shafts and connecting passages, etc. The cross-sectional shape can be circular, horseshoe-shaped, arched, rectangular, elliptical or other irregular shapes. Under the long-term effects of confining pressure, water pressure, vehicle dynamic loads, temperature and freeze-thaw cycles, seepage and chemical media, such structures often suffer from problems such as insufficient circumferential stiffness, cracks and leakage at the wall surface, poor coordination between the lining and the surrounding rock, and overall degradation. Existing tunnels also suffer from the additional adverse factors of material aging during the service life, disturbance during construction and the spread of defects.

[0003] Current reinforcement and repair practices can be broadly categorized into three types: First, using a combination of steel arch frames (or steel ribs) with shotcrete and steel mesh to form a secondary lining or thickened layer; second, adding a cast-in-place or prefabricated secondary lining (including inverted arch closure) to the inside of the original lining to improve circumferential load-bearing capacity and durability through thickening; and third, using lining plates for partial or full-section reinforcement, such as steel plate linings, fiberglass / carbon fiber reinforced composite panels, and corrugated steel linings, supplemented by anchor bolt connections and backfill grouting. While these methods are adaptable to situations where space is limited at the excavation face or in existing structures, they generally suffer from the following problems: long construction time, difficulty in establishing and maintaining controllable circumferential compressive stress in the ring direction, difficulty in achieving continuous fit of the backfill, and the tendency for joints and nodes to form weak rings.

[0004] Regarding the steel arch frame and shotcrete system, its stress path relies on the bond and frictional force transmission between the shotcrete layer and the original lining / surrounding rock, making it difficult to form a uniform circumferential compression state throughout the entire circumference. The shrinkage of the shotcrete layer and temperature effects can easily lead to secondary cracking, and local voids are difficult to identify and remedy in time when the wall is not tightly adhered. Although adding a secondary lining and closing the invert arch can improve the overall integrity, the installation of formwork, reinforcement binding and concrete pouring have high requirements for the width of the construction surface, traffic organization and ventilation and drainage. Moreover, in existing tunnels, it is often constrained by pipelines, track beds and existing equipment, resulting in complex construction organization and significant disruption to the construction period and traffic.

[0005] Traditional corrugated plate construction typically involves prefabricating arch segments at a specific center angle in a factory, then assembling them sequentially along the inner wall on-site to form an arch ring. Grouting is then used to fill the gaps between the arch ring and the surrounding rock to create a support layer. This process relies on bolted connections at the arch segment edge flanges. However, due to clearance and operational limitations, construction workers often place anchor bolts on the inner side of the arch ring (cavity side), making it difficult to achieve connections of equal strength and density on the side closest to the cave wall. This results in asymmetry in circumferential constraint. Under external loads, the support bears combined radial and tangential forces. When the cave undergoes minor deformation or displacement, the side closest to the wall is prone to joint opening or partial detachment due to insufficient constraint. Force flow concentrates at joints and transitions, increasing the risk of leakage and bolt failure, thus affecting overall stability. In areas with complex curvature or variable cross-sections, the difficulty of waveform matching, assembly tolerance control, and backfill continuity control further increases.

[0006] In summary, existing technologies urgently need to construct a reinforcement system that can achieve controllable circumferential action, continuous wall adhesion, and maintain integrity under conditions of unilateral operation and inaccessibility of the wall-adhering side. Utility Model Content

[0007] This utility model proposes a prestressed corrugated plate cavity reinforcement structure to solve the problems in the prior art.

[0008] To achieve the above objectives, the technical solution proposed by this utility model is as follows:

[0009] This utility model provides a prestressed corrugated plate tunnel reinforcement structure, which is installed along the circumference of the tunnel wall on the inner side of the tunnel, including a prestressed corrugated plate system, a concrete system, an anchoring system, and a bearing base installed at the bottom of the tunnel.

[0010] The prestressed corrugated plate system includes multiple corrugated plate units connected sequentially along the circumference of the tunnel body. The corrugated plate units have a continuous waveform in the connection direction and form a continuous trough line on the wall side. Prestressed steel cables are installed along the continuous trough line. The prestressed steel cables are fixed by the anchoring system and are in a prestressed tension state.

[0011] The concrete system includes a back concrete filling layer disposed between the corrugated plate unit and the tunnel body, the back concrete filling layer solidifying the corrugated plate unit, the prestressed steel cable and the tunnel body into one unit;

[0012] The bearing base includes a concrete inverted arch or a base platform, and the bearing base is fixedly connected to the corrugated plate unit, the concrete filling layer behind it, and the anchoring system.

[0013] Furthermore, the corrugated plate unit includes a corrugated plate body and at least two connecting end plates, wherein the connecting end plates are fixed to the ends of the corrugated plate body and are perpendicular to the surface of the corrugated plate body.

[0014] The connecting end plate is provided with a first hole row and a second hole row along its length direction. The first hole row and the second hole row are arranged separately in the width direction of the same connecting end plate and are located on the upper and lower sides of the corrugated plate body respectively. The first hole row is a cable-passing hole, and the cable-passing hole corresponds to the trough position of the corrugated plate body on that side. The second hole row is a bolting hole, and the bolting hole is provided for bolt connection of adjacent corrugated plate units.

[0015] Furthermore, the prestressed steel cables pass through the corresponding cable-passing holes in sequence and are in a tensile anchored state in the finished product state; the two ends of each prestressed steel cable extend beyond the connection range of the multiple corrugated plate units to form exposed sections, and the exposed sections of the prestressed steel cables are fixed by the anchoring system and are in a prestressed tensile state.

[0016] Furthermore, the concrete system also includes an end-cast locking body disposed at the end of the prestressed steel cable, the end-cast locking body being integrally fixed with the anchoring system.

[0017] Furthermore, the end-cast locking body is integrally fixed to the bearing base.

[0018] Furthermore, guide cable limiting members are provided at intervals along the connection direction within the troughs of the corrugated plate body. The guide cable limiting members are fixedly connected to the corrugated plate body and are provided with circular or semi-circular grooves that match the shape of the prestressed steel cable.

[0019] Furthermore, the corrugated plate unit also includes a connecting side plate, which is perpendicular to the connecting end plate and fixed to both sides of the corrugated plate body, and the connecting side plate is provided with lateral connecting holes.

[0020] Furthermore, the anchoring system includes a nut anchor, a tapered anchor, or a tension-adjustable anchor.

[0021] Furthermore, the waveform of the corrugated plate body is a sine wave, a triangular zigzag, a trapezoidal zigzag, or a right-angle zigzag.

[0022] Furthermore, the prestressed steel cable includes reinforcing steel cable, steel strand, single high-strength steel wire, parallel steel wire bundle, or fiber-reinforced composite material cable.

[0023] Compared with the prior art, the beneficial effects of this utility model are:

[0024] This utility model's reinforcement structure sets and tensions prestressed steel cables within the continuous trough lines on the wall-attached side. The prestressed steel cables are integrally fixed with the corrugated plate body and connecting end plates, forming a tension constraint on the joints of adjacent connecting end plates along the connection direction of the corrugated plate. This compensates for the inability to implement bolt connections on the wall-attached side and restricts the opening of the joints of the connecting end plates on the wall-attached side. The prestressed steel cables, in conjunction with the cable-passing holes and guide cable limiting components, can connect discretely assembled corrugated plate units into a continuous force path. The end-cast locking body is integrally fixed with the anchoring system, which is beneficial for maintaining the prestress over a long period and reducing losses caused by displacement, relaxation, etc. The concrete filling layer behind it forms a wall-attached surface contact force transmission with the corrugated plate and the cavity, reducing voids and leakage channels on the wall-attached side and improving circumferential stiffness and overall stability. If necessary, it forms a closed force ring with the concrete invert arch, further improving the reinforcement strength and controlling uneven deformation.

[0025] Of course, implementing the various technical solutions of this utility model does not necessarily require achieving all of the advantages described above at the same time. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained from these drawings without creative effort.

[0027] Figure 1-4 This is a schematic diagram of the internal structure of the cavity reinforcement structure according to an embodiment of this utility model;

[0028] Figure 5 This is a schematic diagram of the hole reinforcement structure according to an embodiment of this utility model;

[0029] Figure 6 yes Figure 2 Enlarged view of point A;

[0030] Figure 7 yes Figure 2 Enlarged view of point B;

[0031] Figure 8 yes Figure 2 Enlarged view of point C;

[0032] Figure 9 This is a structural schematic diagram of the corrugated plate unit according to an embodiment of the present invention;

[0033] In the figure, 1-corrugated plate unit, 101-corrugated plate body, 102-connecting end plate, 103-connecting side plate, 104-cable hole, 105-bolt hole, 106-guide cable limiting component, 107-end casting locking body;

[0034] 2-High-strength bolts;

[0035] 3-Prestressed steel cable;

[0036] 4-Tensioning support;

[0037] 5- Concrete filling layer behind;

[0038] 6- Concrete inverted arch. Detailed Implementation

[0039] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0040] In the description of this patent, it should be understood that the terms “center,” “upper,” “lower,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this patent 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 limitations on this patent.

[0041] In the description of this patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.

[0042] Example 1:

[0043] This embodiment provides a prestressed corrugated plate tunnel reinforcement structure. This reinforcement structure is installed along the circumference of the tunnel wall on the inner side of the tunnel body and includes a prestressed corrugated plate system, a concrete system, and an anchoring system. The prestressed corrugated plate system uses corrugated plate units as basic units. High-strength bolts are used to connect the cables to the tunnel walls via cable-passing holes and bolting holes arranged on the connecting end plates, achieving continuous cable passage along the wall-mounted side. The prestressed cables are arranged along the continuous trough lines along the wall-mounted side and are positioned and guided by guide cable limiters, forming a tie constraint on the joints of the connecting end plates along the wall-mounted side. The prestressed cables are maintained at both ends by casting locking bodies at the ends fixed to the anchoring system. The corrugated plate units, prestressed cables, and the inner wall of the tunnel are integrally fixed through a backfill concrete layer, forming a continuous circumferential lining for surface contact force transmission. If necessary, a concrete inverted arch or foundation can be configured to form a lower closed load-bearing ring. After the concrete filling layer behind it is solidified, the guide cable limiting component and the corrugated plate body together form a fixed guiding channel for the prestressed steel cable, and form a reinforcing rib structure at the trough position to improve the stability and buckling resistance of the wall side; the tensioning support is only used for tensioning during construction and forming support for the end casting locking body, and is not retained as a component in the final product.

[0044] Specifically, the prestressed corrugated plate system comprises multiple corrugated plate units 1 connected sequentially along the inner wall of the tunnel; see [link / reference]. Figure 9 Each corrugated plate unit 1 includes a corrugated plate body 101, connecting end plates 102 fixedly welded to both ends of the corrugated plate body 101 and perpendicular to the surface of the corrugated plate body 101, and connecting side plates 103 fixedly welded to both sides of the corrugated plate body 101 and perpendicular to the surface of the corrugated plate body 101.

[0045] See Figure 9 Two sets of holes are arranged along the length of each corrugated plate unit 1 on the connecting end plate 102, namely the first hole row and the second hole row, as shown in the figure. Figure 6 The first row of holes consists of cable-passing holes 104, each cable-passing hole 104 corresponding one-to-one with the trough position of the corrugated plate body 101 on that side; see also Figure 8 The second hole is a bolt hole 105. Relative to the cable threading hole 104, the bolt hole 105 is located on the other side of the corrugated plate body 101. The bolt hole 105 is used for adjacent corrugated plate units 1 to realize the bolt connection of the connecting end plate 102 to the connecting end plate 102 through high-strength bolts 2.

[0046] See Figure 2When two adjacent corrugated plate units 1 are assembled, their waveform phases are aligned so that the corresponding peaks and troughs continue continuously in the arching connection direction, forming multiple continuous peak and trough lines. On the outside of the arch ring, a prestressed steel cable 3 is set in each continuous trough line. The prestressed steel cable 3 passes through the cable holes 104 of the stacked connecting end plates 102 in sequence according to the arching connection direction, and extends continuously in the trough line until both ends protrude to form exposed sections. Tensioning supports 4 are set to apply pre-tension force to the exposed sections, so that the prestressed steel cable 3 is stretched to the design value and kept taut. The prestressed steel cable 3 forms a circumferential (connection direction) tie constraint in the trough line, which limits the relative opening displacement of the joint of the end plates of adjacent corrugated plate units, thereby suppressing the opening of the wall side and forming the cable and plate to share the force. Then, the exposed sections at both ends of each prestressed steel cable 3 are anchored to the anchoring system. In this embodiment, the anchoring system is a tapered anchor. In other embodiments, the anchoring system can also be a nut anchor, an adjustable anchor, etc., to adapt to different prestressed steel cables and construction conditions.

[0047] See Figure 7 In this embodiment, to ensure the guidance and positioning of the prestressed steel cable 3 within the corrugated plate unit 1, guide cable limiting members 106 are arranged at intervals along the arched connection direction within the troughs of the corrugated plate body 101. The guide cable limiting members 106 are provided with circular or semi-circular grooves that match the shape of the prestressed steel cable 3. The guide cable limiting members 106 are reliably connected to the corrugated plate body 101 by welding. The guide cable limiting members 106 are used to position, guide, and limit the prestressed steel cable 3, constraining the cable body within the corrugated plate unit 1. The prestressed cable 3 is positioned within the valley to control lateral displacement. A stable guiding channel is provided through a circular or semi-circular groove to reduce direct friction between the prestressed cable 3 and the corrugated plate body 101 during cable threading and tensioning. This avoids local scraping, additional bending, and cable force loss during tensioning of the prestressed cable 3, ensuring that the prestressed cable 3 is stressed along the designed trajectory and stably reaches the pretension. At the same time, the position of the prestressed cable 3 is kept stable during grouting, which facilitates the formation of a uniform filling layer and reliable force transmission.

[0048] The concrete system includes a backfill concrete layer 5 between the corrugated plate unit 1 and the tunnel body, and end-cast locking bodies 107 at the ends of the prestressed steel cables 3. The end-cast locking bodies 107 are integrally fixed with the anchoring system locking the ends of the prestressed steel cables 3. Concrete is poured in the anchoring system and the prestressed steel cable section therein, and a casting locking body 107 is formed at both ends of each tensioned prestressed steel cable 3. The casting locking bodies 107 are used to maintain the prestress of the prestressed steel cables 3 and reduce the prestress loss caused by displacement or relaxation.

[0049] See Figure 4A back concrete filling layer 5 is set between the corrugated plate unit 1 and the inner wall of the tunnel. The back concrete filling layer 5 is integrated with the corrugated plate body 101, the connecting end plate 102, the prestressed steel cable 3 and the inner wall of the tunnel to form a surface contact force transmission path that adheres to the wall, fills the gap on the wall side, and improves the overall stiffness and stability of the tunnel reinforcement structure.

[0050] See Figure 5 A concrete inverted arch 6 is also installed at the bottom of the tunnel. The concrete inverted arch 6 is integrated with the end-cast locking body 107. The concrete inverted arch 6 works together with the concrete filling layer 5 behind it and the corrugated plate unit 1 to form a closed stress ring structure, which further improves the overall rigidity and stability of the tunnel reinforcement structure.

[0051] In this embodiment, the back concrete filling layer 5, the concrete invert arch 6, and the cast-in-place locking body 107 are made of fine aggregate concrete, which has good fluidity and pumpability, high bonding performance, low shrinkage, and good impermeability and durability. This facilitates filling the troughs and connecting voids, forming a reliable stress transfer path. In other embodiments, the concrete filling layer can be made of cement-based grouting material, ultrafine cement slurry, shotcrete, epoxy mortar, or polymer-modified mortar, depending on the construction method (pumping / shotcreting), layer thickness, early strength requirements, and environmental durability.

[0052] In this embodiment, the prestressed steel cable 3 is made of steel strand, which has the characteristics of high tensile strength, low relaxation, good flexibility, high efficiency in cable threading and tensioning, and mature compatibility with commonly used mechanical anchors; in other embodiments, the cable body can be made of materials such as steel bar cable, single high-strength steel wire, parallel steel wire bundle or fiber reinforced composite material cable.

[0053] In this embodiment, galvanized corrugated steel sheet is used as the corrugated plate, and the waveform of the corrugated plate body is sinusoidal wave, which has the characteristics of good corrosion resistance, high conformability to forming and arching, continuous and smooth stress transmission, no sharp corner stress concentration at the crests / troughs, high adhesion to the filler layer, and good fatigue adaptability. In other embodiments, the corrugated plate can also be made of weathering steel plate, stainless steel plate, aluminum-magnesium alloy plate, metal composite plate, non-metallic plate, etc.; its waveform includes, but is not limited to, triangular corrugated form, trapezoidal corrugated form, or right-angle corrugated form, to be selected according to the stress requirements, structural requirements, and processing technology.

[0054] See Figures 1-5 The reinforcement method in this embodiment includes the following steps:

[0055] a) Base surface treatment: newly excavated tunnels are completed and repaired; or the inner side of existing tunnels is cleaned, leveled and interface treated, and drainage and local leveling are carried out when necessary.

[0056] b) Wall-mounted assembly and bolting: Multiple corrugated plate units 1 are sequentially mounted on the wall along the circumference; adjacent units are connected on the cavity side by high-strength bolts 2 through bolting holes 105 on the connecting end plate 102; so that the waveform continues continuously in the connection direction and forms a continuous trough line on the wall-mounted side.

[0057] c) Connecting and threading simultaneously: During the circumferential splicing process in step b, prestressed steel cables 3 are simultaneously threaded along the continuous trough line on the wall side, so that they pass through the cable threading holes 104 in sequence; guide cable limiting parts 106 are arranged at the trough intervals of the corrugated plate body 101 for positioning and limiting; exposed sections are reserved at both ends of the prestressed steel cables 3.

[0058] d) Graded tensioning and anchoring: Set tensioning supports 4 and implement graded tensioning on the exposed section of prestressed steel cable 3; control the tension and elongation by dual parameters in a symmetrical or zoned sequence, stabilize and retest, and supplement tension if necessary; fix the cable through the anchoring system after reaching the design value.

[0059] e) End locking: Cast the locking body 107 in the formwork space reserved in the tension support 4 and fix it to the anchoring system at the formed end; cut off the exposed section other than the locking body and remove the tension support.

[0060] f) Backfilling: Pour the backfilling layer 5 from bottom to top, vent and observe the overflow until it is dense, and after curing, make the corrugated plate unit 1, the prestressed steel cable 3 and the tunnel body consolidated together.

[0061] g) Lower Closure (Optional): As needed, pour a concrete inverted arch 6 or a foundation, and fix it with the end-cast locking body to form a lower closed force ring.

[0062] h) Long-distance parallel connection (optional): Adjacent rings can be connected in parallel with high-strength bolts through the lateral connection holes of the connecting side plate 103 to form a continuous reinforcement unit along the line direction; the back filling can be carried out in one whole or in stages, depending on the new tunnel or existing tunnel and the seepage conditions.

[0063] Tensioning support 4 can be selected from centralized tensioning platforms with formwork space according to site conditions to meet the needs of single-sided graded tensioning, multi-cable synchronous tensioning, or bilateral symmetrical tensioning.

[0064] For those skilled in the art, various improvements and modifications can be made without departing from the principles of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A prestressed corrugated plate tunnel reinforcement structure, which is installed along the circumference of the tunnel wall on the inner side of the tunnel body, characterized in that, It includes a prestressed corrugated plate system, a concrete system, an anchoring system, and a load-bearing base set at the bottom of the tunnel; The prestressed corrugated plate system includes multiple corrugated plate units connected sequentially along the circumference of the tunnel body. The corrugated plate units have a continuous waveform in the connection direction and form a continuous trough line on the wall side. Prestressed steel cables are installed along the continuous trough line. The prestressed steel cables are fixed by the anchoring system and are in a prestressed tension state. The concrete system includes a back concrete filling layer disposed between the corrugated plate unit and the tunnel body, the back concrete filling layer solidifying the corrugated plate unit, the prestressed steel cable and the tunnel body into one unit; The bearing base includes a concrete inverted arch or a base platform, and the bearing base is fixedly connected to the corrugated plate unit, the concrete filling layer behind it, and the anchoring system.

2. The prestressed corrugated slab cavity reinforcement structure according to claim 1, characterized in that, The corrugated plate unit includes a corrugated plate body and at least two connecting end plates. The connecting end plates are fixed to the ends of the corrugated plate body and are perpendicular to the surface of the corrugated plate body. The connecting end plate is provided with a first hole row and a second hole row along its length direction. The first hole row and the second hole row are arranged separately in the width direction of the same connecting end plate and are located on the upper and lower sides of the corrugated plate body respectively. The first hole row is a cable-passing hole, and the cable-passing hole corresponds to the trough position of the corrugated plate body on that side. The second hole row is a bolting hole, and the bolting hole is provided for bolt connection of adjacent corrugated plate units.

3. The prestressed corrugated slab cavity reinforcement structure according to claim 2, characterized in that, The prestressed steel cables pass through the corresponding cable-passing holes in sequence and are in a tensile anchored state in the finished product state; the two ends of each prestressed steel cable extend beyond the connection range of multiple corrugated plate units to form exposed sections, and the exposed sections of the prestressed steel cables are fixed by the anchoring system and are in a prestressed tensile state.

4. The prestressed corrugated slab cavity reinforcement structure according to claim 1, characterized in that, The concrete system also includes an end-cast locking body disposed at the end of the prestressed steel cable, the end-cast locking body being integrally fixed with the anchoring system.

5. The prestressed corrugated sheet cavity reinforcement structure according to claim 4, wherein The end-cast locking body is integrally fixed to the bearing base.

6. The prestressed corrugated sheet cavity reinforcement structure according to claim 2, wherein Guide cable limiting members are provided at intervals along the connection direction within the troughs of the corrugated plate body. The guide cable limiting members are fixedly connected to the corrugated plate body and are provided with circular or semi-circular grooves that match the shape of the prestressed steel cable.

7. The prestressed corrugated sheet cavity reinforcement structure according to claim 2, wherein The corrugated plate unit also includes a connecting side plate, which is perpendicular to the connecting end plate and fixed to both sides of the corrugated plate body. The connecting side plate is provided with lateral connecting holes.

8. The prestressed corrugated sheet cavity reinforcement structure according to claim 1, wherein The anchoring system includes nut anchors, tapered anchors, or tension-adjustable anchors.

9. The prestressed corrugated sheet cavity reinforcement structure according to claim 2, wherein The corrugated plate body has a waveform in the form of a sine wave, a triangular zigzag, a trapezoidal zigzag, or a right-angled zigzag.

10. The prestressed corrugated sheet cavity reinforcement structure according to claim 1, wherein The prestressed steel cable includes reinforcing steel cable, steel strand, single high-strength steel wire, parallel steel wire bundle or fiber-reinforced composite material cable.

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