Combined structure for concrete bridge widening and construction method thereof

Abstract

The application discloses a combined structure and construction method for concrete bridge widening, and relates to the technical field of bridge widening. The combined structure for concrete bridge widening comprises a widening assembly and a connecting assembly. The widening assembly comprises a panel unit and a web unit at the bottom of the panel unit. The panel unit comprises a steel bridge panel extending outward from the bridge deck of the bridge to be widened and extending outward from the web unit to be spaced from the side of the bridge to be widened, and a pavement layer covering the steel bridge panel and the bridge deck of the bridge to be widened. The connecting assembly comprises a bridge deck support plate under the steel bridge panel, and a steel-concrete joint section between the bridge deck support plate and the steel bridge panel. A plurality of splice plate units are arranged on the web unit to connect the steel-concrete joint section and the widening assembly in the bridge direction. The bridge deck support plate can improve the bearing capacity at the flange of the bridge to be widened, and the steel-concrete joint section can improve the integrity of the widened connection, so that the installation is convenient and stable.

Description

Technical Field

[0001] This invention relates to the field of bridge widening technology, specifically to a composite structure and construction method for widening concrete bridges. Background Technology

[0002] The existing bridge types are mainly traditional hollow slab, T-beam, and box girder types, with various forms of box girders being widely used. Generally, widening methods mostly follow the principle of structural and material homogeneity, but the connection between the old and new sections bears direct stress, making them prone to cracking. Furthermore, the flange structure of the concrete box girder is a cantilever structure, typically used only as a sidewalk or emergency lane, with relatively low vehicle load frequency and traffic load intensity. When it needs to be used as a main lane, or even when the driving width is increased to both sides, the overall stress on the box girder flanges is poor, and cracks easily form at the root, seriously affecting driving safety. Summary of the Invention

[0003] This application provides a composite structure and construction method for widening concrete bridges, which can solve the technical problems existing in the prior art where the connection part of the widening method is directly stressed and prone to cracking, and the bridge flange has poor load-bearing capacity, and directly setting the widening structure at this point can easily cause cracks at the connection root, which seriously affects the safety of traffic.

[0004] In a first aspect, embodiments of this application provide a composite structure for widening concrete bridges, comprising:

[0005] The widening component includes a panel unit and a web unit located at the bottom of the panel unit. The panel unit includes a steel bridge panel for extending outward from the bridge deck to be widened and extending beyond the web unit to be spaced a certain distance from the side of the bridge to be widened, and a pavement layer for covering the steel bridge panel and the bridge deck to be widened.

[0006] The connecting components disposed on the web unit include a bridge deck support plate located below the steel bridge deck for supporting the bottom surface of the bridge to be widened, and a steel-concrete composite section located between the bridge deck support plate and the steel bridge deck for embedding the bridge's protruding transverse steel reinforcement. The web unit is also provided with a plurality of splicing plate units that are spaced apart along the bridge direction to connect the steel-concrete composite section and the widening components.

[0007] In one embodiment, the bottom of the steel bridge deck is provided with a plurality of ribbed units arranged at intervals along the longitudinal direction of the bridge, and a supporting inner web is provided between two adjacent ribbed units.

[0008] In one embodiment, the bridge deck support plate and the steel bridge deck are spaced apart along the thickness direction of the bridge to be widened to form a pouring space for setting the steel-concrete composite section.

[0009] In one embodiment, the steel-concrete composite section includes a plurality of longitudinal reinforcing bars for connection with the protruding transverse reinforcing bars of the bridge, and concrete poured into the pouring space.

[0010] In one embodiment, the longitudinal reinforcing bars are provided with stirrup units.

[0011] In one embodiment, a pouring groove is provided at one end of the steel bridge deck extending above the bridge deck support plate, and a pouring groove is provided between each two adjacent splicing plate units.

[0012] In one embodiment, the web unit includes a bearing plate and a sealing plate located on the bearing plate for distance from the bridge to be widened.

[0013] In one embodiment, the splicing panel unit includes PBL shear keys, which include two PBL shear keys spaced apart along the thickness direction of the bridge to be spliced.

[0014] In one embodiment, the widening component further includes a bracing unit, which includes a steel bracing. One end of the steel bracing is connected to the bottom end of the bearing plate and the bottom end of the sealing plate, respectively, and the other end is used to connect to the bridge to be widened.

[0015] Secondly, embodiments of this application provide a construction method for constructing the aforementioned combined structure, the construction method comprising:

[0016] Remove the guardrails of the bridge to be widened and cut the sides of the bridge to be widened to expose the protruding crossbar steel bars.

[0017] The combined structure is hoisted to the side of the bridge to be widened after cutting, so that the steel bridge deck faces the bridge to be widened and is flush with the bridge surface, and the bridge deck support plate is located on the bottom surface of the bridge to be widened.

[0018] The steel-concrete composite section is poured to embed the bridge's protruding transverse steel reinforcement within the steel-concrete composite section.

[0019] Based on the hardness of the steel-concrete composite section, a pavement layer is constructed to cover the steel bridge deck and the bridge surface to be widened.

[0020] The beneficial effects of the technical solutions provided in this application include:

[0021] 1. By utilizing the existing structure of the bridge to be widened and coordinating the clamping of the panel unit and the bridge deck support plate, the stiffness of the flange of the bridge to be widened can be increased, thereby improving the load-bearing capacity of the bridge after widening.

[0022] 2. By setting up a steel-concrete composite section for embedding the protruding crossbar reinforcement of the bridge, not only can the connection stability at the splice be improved, but also some of the load can be transferred to the protruding crossbar reinforcement of the bridge through structural linkage, reducing the stress at the splice and reducing the risk of splitting at the splice. In conjunction with the splice plate unit, the internal structural stability of the steel-concrete composite section and the integration of the steel-concrete composite section and the widening component can be improved.

[0023] 3. The widening components and connecting components are all prefabricated in the factory. Unlike the use of concrete splicing, there is no need to erect scaffolding or formwork on site, and no need to pour concrete structures. This results in high construction efficiency and also has higher durability, economy and coordination. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This application provides an embodiment of a combined structure assembly diagram for widening concrete bridges.

[0026] Figure 2 This application provides a schematic diagram of a panel unit structure in a composite structure used for widening concrete bridges, as shown in the embodiments of this application.

[0027] Figure 3 A longitudinal sectional view along the bridge direction of a composite structure for widening concrete bridges, provided in an embodiment of this application;

[0028] Figure 4 A transverse longitudinal section view of a composite structure for widening concrete bridges provided in this application embodiment;

[0029] Figure 5 This is a top view of a composite structure for widening concrete bridges, provided as an embodiment of this application.

[0030] In the diagram: 1. Panel unit; 101. Steel bridge deck; 102. Pavement layer; 103. Ribbed unit; 104. Support inner web; 2. Web unit; 201. Bearing plate; 202. Sealing plate; 203. Side beam web; 3. Bridge deck support plate; 4. Steel-concrete composite section; 401. Longitudinal reinforcement; 402. Stirrup unit; 5. Splice plate unit; 501. PBL shear key; 6. Casting groove; 7. Steel diagonal brace. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0032] First, the technical terms used in this document are explained to facilitate understanding of the technical solutions of this application by those skilled in the art:

[0033] PBL key: Also known as perforated plate connector, it is a shear connector used to resist external shear forces. Its principle is to transfer shear force through the synergistic action of the concrete tenon in the steel plate hole and the through-bar reinforcement, thereby effectively tightening the structure, offsetting structural deformation, and ensuring structural stability. It is commonly used in building construction, highway reconstruction, and equipment manufacturing, and is suitable for improving the stability of various structures.

[0034] Firstly, the embodiments of this application provide a composite structure for widening concrete bridges, which can solve the technical problems existing in the prior art where the connection part of the widening method is directly subjected to force, which is prone to cracking, and the bridge flange has poor load-bearing capacity. Directly setting the widening structure at this location can easily cause cracks at the connection root, which seriously affects the safety of traffic.

[0035] The composite structure for widening a concrete bridge in this application includes a widening component and a connecting component. The widening component is mainly used to widen the bridge to be widened and together with the bridge deck of the bridge to be widened, forms a new walking bridge deck. The connecting component is installed on the side of the widening component facing the bridge to be widened. One end of the connecting component is fixedly connected to the widening component to form an integral part, and the other end is used to connect to the side of the bridge to be widened. In conjunction with the widening component, the connecting component can clamp the flange of the side of the bridge to be widened from above and below, providing certain support to the flange of the bridge to be widened, improving the load-bearing capacity of the original flange of the bridge to be widened, and forming an integral part with the existing structure of the bridge to be widened, thereby improving the connection stability between the widening component and the bridge to be widened.

[0036] Specifically, Figure 1 This application provides an embodiment of a combined structure assembly diagram for widening concrete bridges. Figure 2 This application provides a schematic diagram of the panel unit 1 structure in a composite structure for widening concrete bridges, as shown in the embodiment of this application. Figure 1 , Figure 2As shown, the widening component includes a panel unit 1 and a web unit 2 located at the bottom of the panel unit 1. The panel unit 1 includes a steel bridge panel for extending outward from the bridge deck to be widened and extending beyond the web unit 2 to be spaced a certain distance from the side of the bridge to be widened, and a pavement layer 102 for covering the steel bridge panel and the bridge deck to be widened.

[0037] The steel bridge deck 101 is customized with different widths according to actual needs to meet the widening requirements of different bridges to be widened. At the same time, the steel bridge deck 101 has good flatness and levelness, which can improve the stability of the road and driving comfort. After assembly, the end of the steel bridge deck 101 is spaced at a certain distance from the side of the bridge to be widened. This space is filled by the steel-concrete composite section 4 to improve the connection stability between the two. The steel bridge deck 101 is flush with the bridge deck of the bridge to be widened, thereby improving the overall driving quality of the bridge. In one possible implementation, the steel bridge deck 101 includes several steel plates spliced ​​together to form an integral whole, so that the steel bridge deck 101 as a whole is the same length as the longitudinal direction of the bridge.

[0038] During construction, the pavement layer 102 is the last to be constructed. It covers the steel bridge deck 101 and the bridge deck to be widened to form a new walking bridge deck. It not only provides a bridge deck with good driving performance and durability, but also serves as an effective protection system to prevent water penetration and ensure the durability of the bridge to be widened. The web plate unit 2 is set at the bottom of the panel unit 1. It not only provides welding positions for connecting components and improves the overall stability of the structure, but also improves the aesthetics of the bridge after it is widened.

[0039] Furthermore, the connecting components include a bridge deck support plate 3 located below the steel bridge deck to support the bottom surface of the bridge to be widened, and a steel-concrete composite section 4 located between the bridge deck support plate 3 and the steel bridge deck for embedding the bridge's protruding crossbar reinforcement.

[0040] It should be noted that the protruding transverse reinforcement in this article refers to the internal reinforcement of the bridge deck and the internal reinforcement of the guardrail in the bridge to be widened. They are collectively referred to as the protruding transverse reinforcement in this article. The bridge deck support plate 3 is horizontally set and welded to the side of the web unit 2 facing the bridge to be widened. The horizontal position of the bridge deck support plate 3 is lower than the bottom surface of the bridge to be widened. When the assembly is completed, the top surface of the bridge deck support plate 3 is placed on the bottom surface of the bridge to be widened. Combined with the pavement layer 102 in the panel unit 1, it can clamp the upper and lower surfaces of the bridge deck to be widened, improve the bearing capacity at the flange of the bridge to be widened, and to a certain extent, transfer part of the vertical load at the widening joint to the upper and lower surfaces of the bridge to be widened, reducing the risk of splitting at the widening joint.

[0041] The composite structure in this application is installed on the side of the bridge to be widened. Before assembly, tools are used to remove the bridge railings on the side of the bridge to be widened and to cut the cantilevered portion of the side of the bridge to be widened to expose the protruding transverse steel bars for connecting the composite structure in this application. In one possible embodiment, the thickness of the cantilever cut on the side of the bridge to be widened is 10-20cm. During assembly, the protruding transverse steel bars are first embedded between the bridge deck support plate 3 and the steel bridge deck 101, and then connected to the internal structure of the steel-concrete composite section 4. Finally, concrete is poured to fill the space between the bridge deck support plate 3 and the steel bridge deck 101, as well as between the end of the steel bridge deck 101 and the side of the bridge to be widened, forming the completed steel-concrete composite section 4. In one possible embodiment, ultra-high performance concrete is preferably used to improve the structural integrity and load-bearing capacity.

[0042] Furthermore, the web unit 2 is also provided with several splicing plate units 5 spaced apart along the bridge direction to connect the steel-concrete composite section 4 and the widening component. Each splicing plate unit 5 is arranged longitudinally along the thickness direction of the bridge to be widened, and multiple splicing plate units 5 are arranged equidistantly along the bridge direction. Its side is welded to the side of the web unit 2 facing the bridge to be widened, the top surface is welded with the steel bridge deck 101, and the bottom surface is welded with the bridge deck support plate 3. The other side of the splicing plate unit 5 is embedded in the steel-concrete composite section and connected to the internal structure of the steel-concrete composite section. In conjunction with the above description, the steel-concrete composite section 4 connects the protruding transverse bridge reinforcement, and the splicing plate unit 5 connects the steel-concrete composite section 4 and the widening component. This structure improves the load-bearing capacity, overall stability and durability of the widened bridge, and also provides a strong guarantee for the long-term use of the bridge. In one possible implementation, several protruding transverse bridge reinforcements are regarded as a group, and a splicing plate unit 5 is provided between each two adjacent groups of protruding transverse bridge reinforcements.

[0043] Furthermore, as an optional embodiment, the steel-concrete composite section 4 is also equipped with an anchoring device to further strengthen the structural connection strength. Measures such as prestressed tendons or anchor bolts can be used to further constrain the lateral displacement of the steel bridge deck 101. Taking prestressed tendons as an example, they can be pre-embedded in the bridge to be widened, with one end anchored to the side of the bridge to be widened and the other side anchored to the widening component. By applying prestress, the widening component is constrained to the side of the bridge to be widened, while simultaneously enhancing the overall structural bending stiffness and improving load-bearing capacity. If the engineering structure is not suitable for prestressed tendons, anchor bolts can be used for connection. In this case, holes are pre-drilled on both the side of the bridge to be widened and the side of the widening component. After the widening component is in place, anchor bolts are installed for connection. It should be noted that there are various anchoring methods; the above methods are only illustrative and not intended as specific limitations.

[0044] Furthermore, Figure 3A longitudinal sectional view along the bridge direction of a composite structure for widening concrete bridges, provided as an embodiment of this application, is shown below. Figure 3 As shown, the bottom of the steel bridge deck 101 is provided with a plurality of reinforcing units 103 arranged at intervals along the longitudinal direction of the bridge, and a supporting inner web 104 is provided between two adjacent reinforcing units 103. In one possible embodiment, the reinforcing unit 103 is an inverted T-rib, the web of the inverted T-rib is arranged longitudinally at the bottom of the steel bridge deck 101, and the web of the inverted T-rib is arranged horizontally. It is located inside the web unit 2 and welded to the web unit 2 to form an integral whole. The vertical load of the steel bridge deck 101 is distributed to the web unit 2 through the inverted T-rib. As an optional embodiment, a plurality of inverted T-ribs are grouped together, and a supporting inner web 104 is provided between each two adjacent groups of inverted T-ribs to jointly improve the bearing capacity of the supporting steel bridge deck 101.

[0045] Furthermore, the bridge deck support plate 3 and the steel bridge deck 101 are spaced apart along the thickness direction of the bridge to be widened to form a pouring space for setting the steel-concrete composite section 4. In conjunction with the above description, the top surface of the steel bridge deck 101 is flush with the bridge deck of the bridge to be widened, and the bridge deck support plate 3 supports the bottom surface of the bridge to be widened, so that the bridge's protruding transverse steel bars are embedded in the space between the bridge deck support plate 3 and the steel bridge deck 101, and then the steel-concrete composite section 4 is set in this space.

[0046] Furthermore, Figure 4 A transverse longitudinal section view of a composite structure for widening concrete bridges, as provided in this application embodiment, is shown below. Figure 4 As shown, the steel-concrete composite section 4 includes several longitudinal reinforcing bars 401 for connecting with the protruding transverse reinforcing bars of the bridge, and concrete poured into the pouring space. The protruding transverse reinforcing bars and the longitudinal reinforcing bars 401 are arranged perpendicularly. In one possible embodiment, in order to improve the connection stability between the two, during assembly, the protruding transverse reinforcing bars are first bent at one end of the steel-concrete composite section 4 to hook the longitudinal reinforcing bars 401, and finally concrete is poured to form the steel-concrete composite section 4.

[0047] Furthermore, stirrup units 402 are provided on the longitudinal reinforcing bars 401. The stirrup units 402 are bent and set on the outer periphery of several longitudinal reinforcing bars 401 and bent into the concrete of the steel-concrete composite section 4 to increase the anchoring force. There are multiple sets of stirrup units 402, and multiple sets of stirrup units 402 are arranged at intervals along the length of the longitudinal reinforcing bars 401. In one possible embodiment, each splice plate unit 5 is provided with a stirrup unit 402. Stirrups are a commonly used anchoring means in the art, and the specific posture and setting method will not be described in detail here.

[0048] Furthermore, a pouring groove 6 is provided at one end of the steel bridge deck 101 extending above the bridge deck support plate 3, and a pouring groove 6 is provided between every two adjacent splicing plate units 5. Figure 5This application provides a top view of a composite structure for widening a concrete bridge. The pouring groove 6 can be any shape, such as U-shaped. The pouring groove 6 is mainly used to facilitate concrete pouring and vibration by vibrator. At the same time, the end of the steel bridge deck 101 is spaced a certain distance from the side of the bridge to be widened. In conjunction with the pouring groove 6, it can facilitate the installation of the longitudinal steel reinforcement 401. After the overall assembly is completed, the pavement layer 102 is directly constructed on the steel bridge deck 101.

[0049] Further details can be found here. Figure 4 The web unit 2 includes a bearing plate 201 and a sealing plate 202 located on the bearing plate 201 to be positioned away from the bridge to be widened. The bearing plate 201 and the sealing plate 202 are arranged along the width direction of the steel bridge deck 101. The aforementioned connecting components are all welded to the bearing plate 201. The sealing plate 202 is located on the outermost side of the entire composite structure for edge sealing and improving aesthetics. In one possible embodiment, a side beam web 203 is also provided between the bearing plate 201 and the sealing plate 202. The side beam web 203 is arranged parallel to the bearing plate 201 and the sealing plate 202 along the thickness direction of the bridge to be widened, serving as an internal reinforcement. In conjunction with the above description, the inverted T-rib webs of the ribbed unit 103 are respectively connected to the inner walls of the bearing plate 201 and the side beam web 203.

[0050] In one possible implementation, the combined structure in this application further includes a bracing unit, which includes a steel brace 7. One end of the steel brace 7 is connected to the bottom end of the bearing plate 201 and the bottom end of the sealing plate 202, respectively, and the other end is used to connect to the side of the bridge beam to be widened. There are multiple steel braces 7, which are arranged at equal intervals along the bridge direction. They can adopt box-shaped or I-shaped sections. In practical applications, if the vehicle load calculation of the widening component passes, or if the flange of the bridge to be widened itself has a large stiffness, the steel braces 7 can be omitted, and the widening component can be the main component. When the steel braces 7 are set, the length of the bearing plate 201 is greater than the length of the sealing plate 202 to accommodate the tilt linearity of the steel braces 7.

[0051] Furthermore, the splicing plate unit 5 includes two PBL shear keys 501 spaced apart along the thickness direction of the bridge to be widened. The PBL shear keys 501 are plate-shaped structures, and the two PBL shear keys 501 in the same splicing plate unit 5 are spaced apart vertically. One of the upper PBL shear keys 501 is connected to the bearing plate 201 on its side and to the steel bridge deck 101 on its top surface. The other PBL shear key 501 located below is connected to the bearing plate 201 on its side and to the bridge deck support plate 3 on its bottom surface. Several connection holes are provided on the PBL shear key 501, and the longitudinal reinforcing bars 401 pass through the connection holes to enhance the internal connection of the steel-concrete composite section 4 and the connection strength between the steel-concrete composite section 4 and the widening component.

[0052] The composite structure for widening concrete bridges in this application increases the stiffness of the bridge flanges and improves the load-bearing capacity of the widened bridge by utilizing the existing structure of the bridge to be widened and by clamping it with the panel unit 1 and the bridge deck support plate 3. By setting up a steel-concrete composite section 4 for embedding the protruding transverse bridge reinforcement, it not only improves the connection stability at the widening point, but also transfers part of the load to the protruding transverse bridge reinforcement through structural linkage, reducing the stress at the widening point and lowering the risk of splitting at the widening point. With the splicing plate unit 5, it can improve the internal structural stability of the steel-concrete composite section 4 and the connection strength between the steel-concrete composite section 4 and the widening component. The widening component and the connecting component are all prefabricated in the factory. Unlike concrete widening, there is no need to erect scaffolding or formwork on site, and no need to pour concrete structure. It has high construction efficiency and also has higher durability, economy and coordination.

[0053] Secondly, embodiments of this application provide a construction method for constructing the aforementioned bridge widening composite structure, the construction method comprising:

[0054] S1: Remove the guardrail of the bridge to be widened and cut the side of the bridge to be widened to expose the protruding crossbar steel bars.

[0055] Before the bridge is widened, the above-mentioned bridge widening composite structure, except for the steel-concrete composite section 4, is prefabricated in the factory. The span of the steel bridge deck 101 is determined according to the expected vehicle load and bearing capacity. The splicing plate unit 5 is pre-drilled and welded to the steel bridge deck 101 and the bridge deck support plate 3 to facilitate the passage of the longitudinal reinforcing steel 401. If the vehicle load is large, additional diagonal bracing steel needs to be processed, and the relative positions of the bridge to be widened are ground and pre-drilled.

[0056] S2: Hoist the combined structure to the side of the bridge to be widened after cutting, so that the steel bridge deck 101 faces the bridge to be widened and is flush with the bridge deck, and the bridge deck support plate 3 is located on the bottom surface of the bridge to be widened.

[0057] S3: Pour the steel-concrete composite section 4 to make the bridge's protruding transverse steel reinforcement embedded in the steel-concrete composite section 4;

[0058] After the above-mentioned combined structure is hoisted into place, the installation process is carried out. First, the side of the bridge to be widened is roughened and pre-wetted. Then, the protruding transverse bridge steel bars are bent and adjusted. Subsequently, the longitudinal steel bars 401 are passed through the bending area of ​​the protruding transverse bridge steel bars and the splicing plate unit 5, and the stirrup unit 402 is constructed. Finally, the concrete is poured, vibrated, and cured to fill the space between the steel bridge deck 101 and the bridge deck support plate 3, as well as the space between the end of the steel bridge deck 101 and the side of the bridge to be widened, forming the steel-concrete composite section 4.

[0059] In one possible implementation, the construction method of this application further includes anchoring the widening component. If anchor bolts are used, they can be installed on the side of the widening component before pouring concrete, with the bolt rod extending into the steel-concrete composite section 4. Anchoring is completed after the concrete of the steel-concrete composite section 4 is formed. If prestressed anchoring measures are used, unbonded prestressed tendons are arranged before pouring the steel-concrete composite section 4, with one end anchored to the side of the widening component and the other end anchored to the side of the bridge to be widened. After the concrete strength grade of the steel-concrete composite section 4 meets the requirements, prestress is applied to complete the anchoring. It should be noted that the anchoring methods include various forms and are not limited to the two mentioned above.

[0060] S4: Based on the hardness of the steel-concrete composite section 4, construct the pavement layer 102 to cover the steel bridge deck 101 and the bridge deck to be spliced.

[0061] In one possible implementation, the pavement layer 102 can be divided into an ultra-high performance concrete layer and an asphalt layer. The ultra-high performance concrete layer can be poured together with the concrete in the steel-concrete composite section 4, and then the asphalt layer is poured. Before pouring, the bridge deck to be widened is roughened and pre-wetted, and shear studs are arranged on the top surface of the steel bridge deck 101. Then, longitudinal and transverse steel meshes are laid uniformly, the ultra-high performance concrete layer is poured, and finally the asphalt layer is laid to complete the single-span widening work of the bridge to be widened.

[0062] The combined structure in this application is set on both sides of the bridge to be widened. Therefore, after the widening and reconstruction of the single span of the bridge to be widened is completed according to the above steps, the construction of the other single span of the bridge to be widened will then be carried out.

[0063] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0064] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0065] The above are merely specific embodiments of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A composite structure for widening concrete bridges, characterized in that, include: The widening component includes a panel unit (1) and a web unit (2) located at the bottom of the panel unit (1). The panel unit (1) includes a steel bridge deck (101) for extending outward from the bridge deck to be widened and extending beyond the web unit (2) to be spaced a certain distance from the side of the bridge to be widened, and a pavement layer (102) for covering the steel bridge deck (101) and the bridge deck to be widened. The connecting components are provided on the web unit (2). The connecting components include a bridge deck support plate (3) located below the steel bridge deck (101) for supporting the bottom surface of the bridge to be widened, and a steel-concrete composite section (4) located between the bridge deck support plate (3) and the steel bridge deck (101) for embedding the bridge's protruding transverse reinforcement. The web unit (2) is also provided with a number of splicing plate units (5) for being spaced apart along the bridge direction to connect the steel-concrete composite section (4) and the widening component. The bridge deck support plate (3) and the steel bridge deck (101) are spaced apart along the thickness direction of the bridge to be widened to form a pouring space for setting the steel-concrete composite section (4). The steel-concrete composite section (4) includes a number of longitudinal reinforcement bars (401) for connecting with the bridge's protruding transverse reinforcement, and concrete poured into the pouring space. The web unit (2) includes a bearing plate (201) and a sealing plate (202) located on the bearing plate (201) to be away from the bridge to be widened. The widening assembly also includes a bracing unit, which includes a steel bracing (7). One end of the steel bracing (7) is connected to the bottom end of the bearing plate (201) and the bottom end of the sealing plate (202), respectively, and the other end is used to connect to the bridge to be widened.

2. The composite structure for widening concrete bridges as described in claim 1, characterized in that, The bottom of the steel bridge deck (101) is provided with a number of ribbed units (103) arranged at intervals along the bridge direction, and a supporting inner web plate (104) is provided between two adjacent ribbed units (103).

3. A composite structure for widening concrete bridges as described in claim 1, characterized in that, The longitudinal reinforcing bar (401) is provided with stirrup units (402).

4. A composite structure for widening concrete bridges as described in claim 1, characterized in that, The steel bridge deck (101) extends to one end above the bridge deck support plate (3) and a pouring groove (6) is provided between each two adjacent splicing plate units (5).

5. A composite structure for widening concrete bridges as described in claim 1, characterized in that, The splicing plate unit (5) includes two PBL shear keys (501) spaced apart along the thickness direction of the bridge to be spliced.

6. A construction method for constructing the combined structure according to any one of claims 1 to 5, characterized in that, The construction method includes: Remove the guardrails of the bridge to be widened and cut the sides of the bridge to be widened to expose the protruding crossbar steel bars. The combined structure is hoisted to the side of the bridge to be widened after cutting, so that the steel bridge deck (101) faces the bridge to be widened and is flush with the bridge deck, and the bridge deck support plate (3) is located on the bottom surface of the bridge to be widened. The steel-concrete composite section (4) is poured to embed the bridge's protruding transverse steel reinforcement into the steel-concrete composite section (4); Based on the hardness of the steel-concrete composite section (4), a pavement layer (102) is constructed to cover the steel bridge deck (101) and the bridge deck to be widened.

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