An arch bridge structure based on prestressed corrugated plate

Abstract

The utility model discloses an arch bridge structure based on prestressed corrugated plate, which is composed of multiple corrugated plate units connected along an arch axis to form an arch rib. The corrugated plate unit comprises a corrugated plate body and a connecting end plate perpendicular to the plate surface. A series of through holes and a series of bolt holes are arranged on the end plate. The crests and troughs of adjacent units are continuously connected in the connecting direction to form a continuous trough line along the back of the arch rib. A prestressed cable is arranged in the continuous trough line. The cable is anchored at both ends by a mechanical anchor to an end pouring locking body at the arch foot, so that the cable is in a tensile state. A back concrete filling layer is arranged on the back of the arch rib and is consolidated with a concrete abutment, so that the corrugated plate body, the prestressed cable and the concrete system work together. The continuous trough line without a cable can be provided with a shear connector to strengthen the interface force transmission. The utility model is helpful to suppress the opening and sliding of the arch rib joint and improves the stress continuity and stability of the arch bridge structure.

Description

Technical Field

[0001] This utility model relates to the field of bridge engineering, specifically to an arch bridge structure based on prestressed corrugated plates. Background Technology

[0002] Corrugated steel arches (including highway culvert arches, tunnel arches, and small-to-medium span arch bridges) are widely used for rapid construction and the renovation of existing lines due to their lightweight components, high degree of prefabrication, and strong adaptability to foundations. They are typically formed by assembling several corrugated plate units in sections on site to form arch ribs, which are then connected by high-strength bolts, lap joints, or flanges to complete the circumferential closure, and form an integral load-bearing system with the help of backfill soil or concrete.

[0003] Under the combined effects of complex alignment, segmented assembly, and operational loads, several engineering problems of corrugated steel arches gradually emerge: First, the inner arc joints are in tension or alternating stress zones, and the arch ribs are prone to joint opening and relative slippage under the action of temperature, shrinkage, creep, and vehicle dynamic loads, making it difficult to form a continuous and uniform constraint on circumferential forces; Second, the force transmission between the back filling or lining and the corrugated plate interface relies heavily on discrete anchors and local grouting, resulting in a "point-to-plate" force transmission characteristic at the interface, insufficient shear continuity, and difficulty in achieving long-term stable steel-concrete synergy; Third, the reaction forces in the arch foot area are concentrated and the structure is restricted. If the force flow path between the end structure and the foundation is unclear, it may lead to local stress concentration and durability risks.

[0004] To improve load-bearing capacity and stiffness, existing projects often improve these aspects by thickening the plates, adding stiffeners, increasing bolt density, thickening the back concrete, or optimizing the lining reinforcement. However, this can lead to increased self-weight and cost, as well as limited construction timelines. Publicly available solutions also propose adding connecting components between the corrugated steel plate and the concrete to improve the interface's pull-out and shear resistance, or installing reinforcing steel plates at the troughs to improve local stress distribution and connection reliability. While these approaches can improve local performance to some extent, there is still room for improvement in terms of the overall structural continuity of the arch rib, long-term deformation coordination, and ease of maintenance.

[0005] Furthermore, small and medium-span arch bridges often employ segmented placement and high-altitude assembly, where on-site geometric accuracy, arch axis deviation, and construction errors significantly impact the circumferential internal force distribution. Under environmental influences and repeated vehicle loads, the out-of-plane stability of the arch ribs, fatigue performance, water sealing and drainage, and interface durability also become key areas of focus during operation. How to maintain the advantages of prefabricated construction while ensuring a reliable composite stress relationship between the arch ribs and the underlying concrete, guaranteeing the continuity of stress on the arch ring and the clarity of reaction force transmission, and simultaneously considering construction feasibility and subsequent maintenance, remains a direction of ongoing focus for related engineering technologies. Summary of the Invention

[0006] This invention proposes an arch bridge structure based on prestressed corrugated plates, which solves the problems in the prior art.

[0007] To achieve the above objectives, the technical solution proposed by this utility model is as follows:

[0008] An arch bridge structure based on prestressed corrugated plates is spanned between the left and right abutments. The arch bridge structure includes multiple corrugated plate units that are connected sequentially along the arch axis to form the arch rib, a prestressed locking body that applies and maintains pretension on the arch rib, and a concrete system that is integrally fixed to the back of the arch rib and the prestressed cable body.

[0009] Each of the corrugated plate units includes a corrugated plate body and connecting end plates fixed at both ends and perpendicular to the plate surface. The connecting end plates are provided with a row of cable-passing holes and a row of bolting holes, which are arranged on both sides of the corrugated plate body. The row of cable-passing holes corresponds to the trough of the corrugated plate body on that side.

[0010] The crests and troughs of adjacent corrugated plate units continue sequentially in the connection direction, forming a continuous trough line along the back of the arch rib; a prestressed cable is installed through the continuous trough line, and the two ends of the prestressed cable pass through the arch rib and are fixed to the arch foot of the arch rib by the end casting locking body with mechanical anchor and are in a prestressed tension state.

[0011] The concrete system includes a back concrete filling layer set on the back of the arch rib and a concrete arch seat fixed to the end casting locking body. The back concrete filling layer and the concrete arch seat are fixed together with the corrugated plate body, the prestressed cable body, the mechanical anchor and the end casting locking body.

[0012] Furthermore, a prestressed cable is provided within each continuous trough line formed on the back of the arch rib.

[0013] Furthermore, prestressed cables are spaced apart within the multiple continuous trough lines formed on the back of the arch rib; several shear connectors are installed within the continuous trough lines where no prestressed cables are installed.

[0014] Furthermore, the shear connector includes a pull-out steel bar, overlapping transverse ribs, pre-welded pressure plates, and an upper pressure nut. The pull-out steel bar includes a lower bar body and a multi-shaped pull-out head located at the upper end of the bar body. A transverse rib is provided in the middle of the bar body. A pre-welded pressure plate is fixedly provided in the lower part of the bar body. An external thread is provided in the lower part of the bar body. An upper pressure nut is provided in the lower part of the bar body through the external thread. The upper pressure nut is located below the pre-welded pressure plate. The pull-out steel bar passes through a pre-set through hole in the corrugated plate body. The upper pressure nut is screwed on from the bottom of the corrugated plate body upwards. The pre-welded pressure plate and the upper pressure nut are arranged on the upper and lower sides of the corrugated plate body to clamp and fix it. The overlapping transverse ribs abut against the two sides of the trough of the corrugated plate body. The shear connector is filled in the concrete filling layer behind it.

[0015] Furthermore, the anti-pull head can be any one of L-shaped, T-shaped, or cross-shaped.

[0016] Furthermore, guide cable limiting members are provided at intervals within the continuous trough lines of the prestressed cable 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 prestressed cable body.

[0017] 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. The connecting side plate is provided with a lateral connecting hole for connecting with an adjacent parallel arch rib.

[0018] Furthermore, the mechanical anchor includes a nut anchor, a tapered anchor, or a tension-adjustable anchor.

[0019] Furthermore, the waveform of the corrugated plate body is a sinusoidal wave, a triangular zigzag, a trapezoidal zigzag, or a right-angled zigzag.

[0020] Furthermore, the prestressed cable body includes reinforcing cables, steel strands, single high-strength steel wires, parallel steel wire bundles, or fiber-reinforced composite material cables.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] This utility model's structure arranges prestressed cables within the continuous trough lines of the inner arc of the arch rib, and forms reaction forces and constraints at the arch foot through mechanical anchors and end-cast locking bodies. Simultaneously, the back concrete filling layer and concrete arch seat are integrally fixed to the back of the arch rib. This combination helps to establish a more continuous force connection in the circumferential direction, suppresses the opening and relative slippage of segmented joints, and improves the coordination of internal forces and deformations under temperature, shrinkage, and traffic effects. The end force flow path is clear, making it easy to maintain prestress, and the overall workability and stability during the service stage are relatively better.

[0023] One embodiment of this invention features a shear connector installed along a continuous trough line where no cables are arranged. This connector, through the multi-shaped pull-out head of the pull-out steel bar embedded in the back concrete, and the clamping of the corrugated plate by pre-welded pressure plates and upper pressure nuts, forms a more direct surface-to-surface force transmission path. This structure enhances the interface's pull-out and shear resistance, reduces the possibility of interface slippage, and is beneficial for achieving the desired stress distribution and maintaining the long-term performance of the steel-concrete composite structure.

[0024] In one embodiment of this utility model, guide cable limiting components are provided at intervals along the troughs of the cable arrangement, which can position and laterally limit the cable, reduce the risk of relative friction and displacement with the plate edge, and refine the stress boundary conditions; when necessary, reinforcing steel plates are provided in the troughs, which helps to improve local stiffness and connection reliability, and provides a more stable hole group and bearing foundation for lateral connection or installation of accessories.

[0025] One embodiment of this utility model connects the side plate and its lateral connecting holes to facilitate the connection of parallel arch ribs or transverse components, improving the collaborative work and lateral load distribution when multiple arches are connected in parallel; the mechanical anchor type, corrugated plate waveform and cable type provide a variety of optional configurations, which are convenient to make reasonable matching with different spans, loads and construction conditions, while maintaining the characteristics of prefabricated construction and reducing the degree of modification to the existing manufacturing and installation system.

[0026] 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

[0027] 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.

[0028] Figures 1-5 This is a schematic diagram of the arch bridge structure of Embodiment 1 of this utility model;

[0029] Figure 6 This is a structural schematic diagram of the shear connector of Embodiment 2 of this utility model;

[0030] Figure 7 This is a schematic diagram of the connection between the shear connector and the arch rib in Embodiment 2 of this utility model;

[0031] Figure 8 This is a schematic diagram of the structure of a single corrugated plate unit according to an embodiment of this utility model;

[0032] Figure 9 This is a waveform diagram of the corrugated plate unit of this utility model;

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

[0034] 2-Shear connector, 201-Pull-out steel bar, 202-Overlapping cross bar, 203-Pre-welded pressure plate, 204-Upper pressure nut, 205-Pull-out head;

[0035] 3-Prestressed cable body;

[0036] 4-Tensioning support;

[0037] 5- Concrete filling layer behind;

[0038] 6- Concrete arch seat. 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] Reference Figures 1-5 This embodiment provides an arch bridge structure based on prestressed corrugated plates, spanning between the left and right abutments. The arch ribs of the arch bridge structure are composed of multiple corrugated plate units 1 connected sequentially along the arch axis. Each corrugated plate unit 1 includes a corrugated plate body 101, a connecting end plate 102 perpendicular to the plate surface, and connecting side plates 103 located on both sides of the corrugated plate body 101. For specific structure details, please refer to the attached diagram. Figure 7The connecting end plate 102 is provided with a cable-passing hole row 104 and a bolting hole row 105 along the plate height direction. The two rows of holes are located on both sides of the corrugated plate body 101. The cable-passing hole row 104 corresponds to the trough of the corrugated plate body 101 on that side, and is used to allow the prestressed cable 3 to pass through. Adjacent corrugated plate units 1 are connected by high-strength bolts through the bolting hole row 105. After connection, adjacent peaks and adjacent troughs continue in sequence in the connection direction, thereby forming several continuous trough lines extending along the arch axis on the back of the arch rib. Lateral connection holes are provided on the connecting side plate 103 for connecting with adjacent parallel arch ribs.

[0044] Reference Figures 1-2 In this embodiment, a prestressed cable 3 is installed through at least one continuous trough line. The prestressed cable 3 passes sequentially through the cable-passing hole array 104 on the connecting end plate 102 of each corrugated plate unit 1, and is tensioned outside the arch foot via a tensioning support 4. After tensioning to the designed prestress, it is pre-anchored using mechanical anchors. Then, an end-cast locking body 107 is cast on the prestressed cable 3 where the mechanical anchor is located. Finally, the end-cast locking body 107 is integrally cast with the concrete arch foot 6, so that the prestressed cable 3 is in a prestressed tension state and forms a clear reaction force and constraint in the arch foot area. It should be noted that the tensioning support 4 can be removed after the prestressed cable 3 is tensioned and anchored.

[0045] Reference Figure 4 A back concrete filling layer 5 is provided on the back of the arch rib. The back concrete filling layer 5 is fixed to the concrete arch seat 6 as a whole. The back concrete filling layer 5, together with the corrugated plate body 101 and the prestressed cable 3, forms a composite force system. In order to stabilize the spatial position of the prestressed cable 3 in the continuous trough line, guide cable limiting members 106 are set at intervals along the arch axis in the continuous trough line where the prestressed cable 3 is arranged. The guide cable limiting members 106 are fixedly connected to the corrugated plate body 101. The guide cable limiting members 106 are provided with circular grooves or semi-circular grooves that match the prestressed cable 3, which are used to lift and laterally limit the prestressed cable 3, thereby reducing the relative friction between the prestressed cable 3 and the plate body during the tensioning process.

[0046] In this embodiment, by arranging prestressed cables 3 under tension within the continuous trough line on the back of the arch rib, and by forming a reaction zone with the end-cast locking body 107 and the concrete arch seat 6, the segmented corrugated plate unit 1 establishes a relatively continuous force connection in the circumferential direction. This helps to suppress the opening of the joints and relative slippage, and improve the distribution of internal forces and deformation coordination under temperature, shrinkage and traffic effects. The concrete filling layer 5 behind provides surface support, which helps to improve the overall workability of the arch rib and the stability during the operation phase.

[0047] Example 2:

[0048] In this embodiment, a prestressed cable 3 is installed within the intervald continuous trough lines, and several shear connectors 2 are installed within the continuous trough lines where no prestressed cable 3 is installed, to enhance the pull-out and shear force transmission between the corrugated plate body 101 and the underlying concrete filling layer 5. See Figure 6 In this embodiment, the shear connector 2 includes a pull-out steel bar 201, an overlapping transverse rib 202, a pre-welded pressure plate 203, an upper pressure nut 204, and a pull-out head 205 located at the upper end of the pull-out steel bar 201. The pull-out steel bar 201 is composed of a lower bar body and a pull-out head 205 located at the upper end of the bar body. In this embodiment, the pull-out head 205 has a cross-shaped structure. The overlapping transverse rib 202 is fixedly provided in the middle of the pull-out steel bar 201, the pre-welded pressure plate 203 is fixedly provided in the lower part of the pull-out steel bar 201, and an external thread is provided in the lower part of the pull-out steel bar 201 to install the upper pressure nut 204.

[0049] Reference Figure 6 and Figure 7 The corrugated plate body 101 has pre-drilled through holes at the corresponding trough positions. During installation, the pull-out steel bar 201 is passed through the pre-drilled through holes of the corrugated plate body 101 from bottom to top, so that the pre-welded pressure plate 203 is located on the upper side of the corrugated plate body 101. The upper pressure nut 204 is tightened from bottom to top, so that the pre-welded pressure plate 203 and the upper pressure nut 204 are positioned on the upper and lower sides of the corrugated plate body 101 respectively, clamping and fixing the corrugated plate body 101. The overlapping horizontal reinforcement 202 spans across both sides of the trough and abuts against both sides of the trough of the corrugated plate body 101. It can be combined with spot welding for positioning to equalize the local stress. Subsequently, a concrete filling layer 5 is poured on the back of the arch rib where the prestressed cable body 3 and the shear connector 2 are set.

[0050] Other structural details in this embodiment are the same as in Embodiment 1, and will not be repeated here.

[0051] In this embodiment, the prestressed cables 3 are spaced apart, and shear connectors 2 are arranged along the continuous trough lines where no prestressed cables 3 are installed. This creates a reliable pull-out and shear force transmission path between the concrete filling layer 5 behind and the corrugated plate body 101, reducing the possibility of relative slippage between the two. Together with the circumferential constraints formed by the continuous trough lines where prestressed cables 3 are installed, this helps to improve the stress continuity and overall workability of the arch rib, and is beneficial for maintaining long-term performance and maintenance management.

[0052] In the above embodiments, the back concrete filling layer 5, the concrete arch seat 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 is beneficial for filling the troughs and connecting the voids to form 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, etc., and the configuration is based on the construction method (pumping / shotcreting), layer thickness, early strength requirements, and environmental durability.

[0053] In the above embodiments, the prestressed cable body 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.

[0054] In the above embodiments, the corrugated plate body 101 is made of galvanized corrugated steel 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 filling layer, and good fatigue adaptability. See also Figure 9 In other embodiments, the corrugated plate may also be made of weathering steel plate, stainless steel plate, aluminum-magnesium alloy plate or metal composite plate, non-metallic plate or other materials; its waveform includes but is not limited to triangular corrugation, trapezoidal corrugation or right-angle corrugation, to be selected according to the stress requirements, structural requirements and processing technology.

[0055] 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. An arch bridge structure based on prestressed corrugated plates, spanning between left and right abutments, characterized in that, The arch bridge structure includes multiple corrugated plate units that are connected sequentially along the arch axis to form the arch rib, a prestressed locking body that applies and maintains prestress on the arch rib, and a concrete system that is integrally fixed to the back of the arch rib and the prestressed cable body. Each of the corrugated plate units includes a corrugated plate body and connecting end plates fixed at both ends and perpendicular to the plate surface. The connecting end plates are provided with a row of cable-passing holes and a row of bolting holes, which are arranged on both sides of the corrugated plate body. The row of cable-passing holes corresponds to the trough of the corrugated plate body on that side. The crests and troughs of adjacent corrugated plate units continue sequentially in the connection direction, forming a continuous trough line along the back of the arch rib; a prestressed cable is installed through the continuous trough line, and the two ends of the prestressed cable pass through the arch rib and are fixed to the arch foot of the arch rib by the end casting locking body with mechanical anchor and are in a prestressed tension state. The concrete system includes a back concrete filling layer set on the back of the arch rib and a concrete arch seat fixed to the end casting locking body. The back concrete filling layer and the concrete arch seat are fixed together with the corrugated plate body, the prestressed cable body, the mechanical anchor and the end casting locking body.

2. The arch bridge structure based on prestressed corrugated plate according to claim 1, characterized in that, One of the prestressed cables is installed within each continuous trough line formed on the back of the arch rib.

3. The arch bridge structure based on prestressed corrugated plates according to claim 1, characterized in that, Prestressed cables are spaced apart within multiple continuous trough lines formed on the back of the arch rib; several shear connectors are installed within continuous trough lines where no prestressed cables are installed.

4. The arch bridge structure based on prestressed corrugated plate according to claim 3, characterized in that, The shear connector includes a pull-out steel bar, overlapping transverse ribs, pre-welded pressure plates, and an upper pressure nut. The pull-out steel bar includes a lower bar body and a multi-shaped pull-out head located at the upper end of the bar body. A transverse rib is provided in the middle of the bar body. A pre-welded pressure plate is fixedly provided in the lower part of the bar body. An external thread is provided in the lower part of the bar body. An upper pressure nut is provided in the lower part of the bar body through the external thread. The upper pressure nut is located below the pre-welded pressure plate. The pull-out steel bar passes through a pre-set through hole in the corrugated plate body. The upper pressure nut is screwed on from the bottom of the corrugated plate body upwards. The pre-welded pressure plate and the upper pressure nut are arranged on the upper and lower sides of the corrugated plate body to clamp and fix it. The overlapping transverse ribs are pressed against the two sides of the trough of the corrugated plate body. The shear connector is filled in the concrete filling layer behind it.

5. The arch bridge structure based on prestressed corrugated plates according to claim 4, characterized in that, The pull-out head can be any one of L-shaped, T-shaped, or cross-shaped.

6. The arch bridge structure based on prestressed corrugated plates according to claim 2 or 3, characterized in that, Guide cable limiting members are provided at intervals within the continuous trough lines of the prestressed cable 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 prestressed cable body.

7. The arch bridge structure based on prestressed corrugated plate according to claim 1, characterized in that, 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 a lateral connecting hole, which is used to connect with an adjacent parallel arch rib.

8. The arch bridge structure based on prestressed corrugated plate according to claim 1, characterized in that, The mechanical anchorage includes a nut anchor, a tapered anchor, or a tension-adjustable anchor.

9. The arch bridge structure based on prestressed corrugated plate according to claim 1, characterized in that, 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 arch bridge structure based on prestressed corrugated plate according to claim 1, characterized in that, The prestressed cable body includes steel cables, steel strands, single high-strength steel wires, parallel steel wire bundles, or fiber-reinforced composite material cables.

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