Composite structure for widening concrete bridge and construction method

Abstract

The invention discloses a composite structure for concrete bridge widening and a construction method, and relates to the technical field of bridge widening, the composite structure for concrete bridge widening comprises a widening assembly and a connecting assembly, the widening assembly comprises a panel unit and a web unit located at the bottom of the panel unit, the steel bridge deck is used for extending out of the bridge deck of the to-be-widened bridge and stretching out of the web unit to be spaced from the side face of the to-be-widened bridge, and the pavement layer covers the steel bridge deck and the bridge deck of the to-be-widened bridge. The connecting assembly comprises a bridge deck supporting plate located below the steel bridge deck slab and a steel-concrete combined section located between the bridge deck supporting plate and the steel bridge deck slab, and a plurality of splice plate units used for being arranged at intervals in the bridge direction to connect the steel-concrete combined section and the widening assembly are further arranged on the web unit. The bearing capacity of the flange of the bridge to be widened can be improved by arranging the bridge floor crossing supporting plate, the integration of the widening connecting position is improved through cooperation with the steel-concrete combined section, installation is convenient, and stability is high.

Description

Technical Field

[0001] The invention relates to the technical field of bridge widening, and in particular to a combined structure and a construction method for widening a concrete bridge. Background Art

[0003] The existing bridge types are mainly traditional hollow slabs, T-beams, and box beams, among which various forms of box beams are widely used. The general widening method mostly adopts the principle of the same structure and materials, but the new and old connection parts are directly stressed and prone to cracking. At the same time, the flange structure of the concrete box beam is a cantilever structure, which is generally only used as a sidewalk or emergency lane, and the vehicle load frequency and traffic load intensity are low. When it is necessary to use it as the main lane, or even increase the driving width on both sides, the overall stress of the box beam flange is poor, and cracks are prone to occur at the root, which seriously affects the safety of driving. Summary of the invention

[0004] The present application provides a combined structure and construction method for widening a concrete bridge, which can solve the technical problems in the prior art that the widening connection parts of the traditional widening means are directly subjected to force and are prone to cracking, and the flange of the bridge has poor inherent load-bearing capacity. If the widening structure is directly set here, cracks are likely to occur at the connection root, seriously affecting the safety of driving.

[0005] In a first aspect, an embodiment of the present application provides a combined structure for widening a concrete bridge, comprising:

[0006] A widening assembly, the widening assembly comprising a panel unit and a web unit located at the bottom of the panel unit, the panel unit comprising a steel bridge deck extending outward from the bridge deck to be widened and extending outward from the web unit to be spaced a certain distance from the side of the bridge to be widened, and a pavement layer covering the steel bridge deck and the bridge deck to be widened;

[0007] A connection component is arranged on the web unit, and the connection component includes 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 joint section located between the bridge deck support plate and the steel bridge deck for embedding the protruding transverse bridge reinforcement of the bridge. The web unit is also provided with a plurality of splicing plate units that are arranged at intervals along the bridge direction to connect the steel-concrete joint section and the widening component.

[0008] In one embodiment, a plurality of ribbed units are provided at the bottom of the steel bridge deck and are arranged at intervals along the bridge direction, and a supporting inner web is provided between two adjacent ribbed units.

[0009] 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 joint section.

[0010] In one embodiment, the steel-concrete combined section includes a plurality of steel bars along the bridge for connecting with the protruding transverse bridge steel bars of the bridge, and concrete poured into the pouring space.

[0011] In one embodiment, stirrup units are provided on the steel bars along the bridge direction.

[0012] 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.

[0013] In one embodiment, the web plate unit includes a bearing plate and a covering plate located on the bearing plate and away from the bridge to be widened.

[0014] In one embodiment, the splicing plate unit includes a PBL shear key, and the PBL shear key includes two PBL shear keys spaced apart along a thickness direction of the bridge to be widened.

[0015] In one embodiment, the widening component also includes a diagonal brace unit, which includes a steel diagonal brace, one end surface of which is respectively connected to the bottom end of the pressure plate and the bottom end of the closing plate, and the other end is used to connect to the bridge to be widened.

[0016] In a second aspect, an embodiment of the present application provides a construction method for constructing the above-mentioned combined structure, the construction method comprising:

[0017] Chisel away the guardrails of the bridge to be widened, and cut the sides of the bridge to be widened to expose the protruding cross-bridge steel bars of the bridge;

[0018] Hoisting the combined structure 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 deck of the bridge to be widened, and the bridge deck support plate is located on the bottom surface of the bridge to be widened;

[0019] Cast the steel-concrete joint section so that the protruding transverse bridge steel bars are embedded in the steel-concrete joint section;

[0020] Based on the hardness of the steel-concrete combined section, a pavement layer is constructed to cover the steel bridge deck and the bridge deck to be widened.

[0021] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0022] 1. By utilizing the original structure of the bridge to be widened and clamping the panel unit with the bridge deck support plate, the stiffness of the flange of the bridge to be widened can be increased, and the bearing capacity of the bridge after widening can be improved;

[0023] 2. By setting up a steel-concrete joint section for embedding the protruding cross-bridge steel bars of the bridge, not only can the connection stability of the widening part be improved, but also part of the load can be transferred to the protruding cross-bridge steel bars of the bridge through the structural linkage effect, thereby reducing the stress at the widening part and reducing the risk of splitting at the widening part. In combination with the splicing plate unit, the internal structural stability of the steel-concrete joint section and the integrity of the steel-concrete joint section and the widening component can be improved;

[0024] 3. Widening components and connecting components are prefabricated in the factory. Unlike widening with concrete, there is no need to set up scaffolding and formwork on site, and no need to cast concrete structure. The construction efficiency is high and it also has higher durability, economy and coordination. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A schematic diagram of an assembly of a combined structure for widening a concrete bridge provided in an embodiment of the present application;

[0027] Figure 2 A schematic diagram of a panel unit structure in a combined structure for widening a concrete bridge provided in an embodiment of the present application;

[0028] Figure 3 A longitudinal cross-sectional view along the bridge direction of a combined structure for widening a concrete bridge provided in an embodiment of the present application;

[0029] Figure 4 A longitudinal cross-sectional view of a composite structure for widening a concrete bridge provided in an embodiment of the present application;

[0030] Figure 5 A top view of a combined structure for widening a concrete bridge provided in an embodiment of the present application.

[0031] In the figure: 1. Panel unit; 101. Steel bridge deck; 102. Pavement layer; 103. Ribbing unit; 104. Support inner web; 2. Web unit; 201. Pressure plate; 202. Closing plate; 203. Side beam web; 3. Bridge deck support plate; 4. Steel-concrete combined section; 401. Steel bars along the bridge direction; 402. Stirrup unit; 5. Spliced ​​plate unit; 501. PBL shear key; 6. Casting notch; 7. Steel diagonal brace. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] First, the professional terms appearing in this article are explained to facilitate those skilled in the art to understand the technical solution of this application:

[0034] PBL key: also known as perforated plate connector, is a shear connector used to resist external shear force. Its principle is to transmit shear force through the synergistic effect of concrete tenons and through-steel bars in the holes of steel plates, thereby effectively tightening the structure, offsetting the deformation of the structure, and ensuring the stability of the structure. It is often used in construction, highway reconstruction and equipment manufacturing, and is suitable for improving the stability of various structures.

[0035] On the first aspect, the embodiments of the present application provide a composite structure for widening concrete bridges, which can solve the technical problems existing in the prior art that the widening connection parts of traditional widening means are directly subjected to force and are prone to cracking, and the flange of the bridge has poor inherent load-bearing capacity. If the widening structure is directly set here, cracks are likely to occur at the connection root, seriously affecting the safety of driving.

[0036] The combined structure of the widening of the concrete bridge in the present application includes a widening component and a connecting component. The widening component is mainly used to widen the bridge to be widened and form a new walking bridge deck together with the bridge deck of the bridge to be widened. The connecting component is used to be arranged 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 a whole, and the other side is used to connect to the side of the bridge to be widened. In conjunction with the widening component, it can clamp the flange of the side of the bridge to be widened up and down, and can provide certain support to the flange of the bridge to be widened, thereby improving the bearing capacity of the original flange of the bridge to be widened, and forming an integral body with the existing structure of the bridge to be widened, so as to improve the connection stability between the widening component and the bridge to be widened.

[0037] Specifically, Figure 1 A schematic diagram of an assembly structure for widening a concrete bridge provided in an embodiment of the present application, Figure 2 A schematic diagram of the structure of a panel unit 1 in a combined structure for widening a concrete bridge provided in an embodiment of the present application is shown in FIG. 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 deck extending out of the bridge deck to be widened and extending out of 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 and the bridge deck to be widened.

[0038] The steel bridge deck 101 can be 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 a certain distance from the side of the bridge to be widened, and this space is filled with the steel-concrete combined section 4 to improve the connection stability between the two. The steel bridge deck 101 is flush with the bridge deck to be widened, thereby improving the driving quality of the entire bridge. In a possible implementation, the steel bridge deck 101 includes a plurality of steel plates spliced ​​together to form an integral whole, so that the overall length of the steel bridge deck 101 is the same as the direction along the bridge.

[0039] During the construction process, the pavement layer 102 is constructed last, which 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 moisture penetration and ensure the durability of the bridge to be widened. The web unit 2 is arranged at the bottom of the panel unit 1, which is not only used to provide a welding position for the connecting components, and can improve the overall stability of the structure, but also can improve the aesthetics of the bridge to be widened after widening.

[0040] Furthermore, the connection assembly includes a bridge deck support plate 3 located below the steel bridge deck for supporting the bottom surface of the bridge to be widened, and a steel-concrete joint section 4 located between the bridge deck support plate 3 and the steel bridge deck for embedding the protruding transverse bridge reinforcement of the bridge.

[0041] It should be noted that the protruding transverse bridge steel bars of the bridge in this article are the internal steel bars of the bridge deck and the internal steel bars of the guardrail in the bridge to be widened, which are collectively referred to as the protruding transverse bridge steel bars of the bridge in this article. The bridge deck support plate 3 is horizontally arranged and welded to the side of the web unit 2 facing the bridge to be widened, and 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 surface to be widened, improve the bearing capacity at the flange of the bridge to be widened, and to a certain extent, can transfer part of the vertical load at the widening connection to the upper and lower surfaces of the bridge to be widened, reducing the risk of splitting at the widening connection.

[0042] The combined structure in the present application is arranged on the side of the bridge to be widened. Before assembly, it is necessary to use tools to chisel out the bridge guardrail on the side of the bridge to be widened, and cut the cantilever part of the side of the bridge to be widened to expose the protruding cross-bridge steel bars of the bridge for connecting the combined structure in the present application. In a possible embodiment, the cantilever cutting thickness of the side of the bridge to be widened is 10 to 20 cm. During assembly, the protruding cross-bridge steel bars of the bridge are first embedded between the bridge deck support plate 3 and the steel bridge deck 101, and the protruding cross-bridge steel bars of the bridge are connected to the internal structure of the steel-concrete joint section 4. Finally, concrete is poured to fill the space between the bridge deck support plate 3 and the steel bridge deck 101, and between the end of the steel bridge deck 101 and the side of the bridge to be widened, to form a completed steel-concrete joint section 4. In a possible embodiment, the concrete preferably uses ultra-high performance concrete to improve the structural integrity and bearing capacity.

[0043] Furthermore, the web unit 2 is also provided with a plurality of splicing plate units 5 which are arranged at intervals along the bridge direction for connecting the steel-concrete combined section 4 and the widening component. A single splicing plate unit 5 is arranged longitudinally along the thickness direction of the bridge to be widened, and a plurality of splicing plate units 5 are arranged equidistantly along the bridge direction, and their side surfaces are welded to the side of the web unit 2 facing the bridge to be widened, the steel bridge deck 101 is welded on the top surface, and the bridge deck support plate 3 is welded on the bottom surface. The other side surface of the splicing plate unit 5 is embedded in the steel-concrete combined section and connected to the internal structure of the steel-concrete combined section. Combined with the above description, the steel-concrete combined section 4 is connected to the protruding transverse bridge steel bars of the bridge, and the splicing plate unit 5 is connected to the steel-concrete combined section 4 and the widening component. This structure improves the bearing capacity, overall stability and durability of the bridge after widening, and also provides a strong guarantee for the long-term use of the bridge. In a possible implementation manner, a plurality of protruding transverse bridge steel bars of the bridge are regarded as a group, and a splicing plate unit 5 is arranged between each two adjacent groups of protruding transverse bridge steel bars of the bridge.

[0044] Furthermore, as an optional embodiment, the steel-concrete joint section 4 is also provided with an anchoring device as a further reinforcement of the structural connection strength. Prestressed tendons or anchor bolts may be used to further constrain the transverse displacement of the steel bridge deck 101. Taking prestressed tendons as an example, they may be pre-buried in the bridge to be widened, with one end anchored to the side of the bridge to be widened and one side anchored to the side of the widening component. By applying pre-tensioning stress, the widening component is constrained to the side of the bridge to be widened, while enhancing the bending stiffness of the overall structure and improving the bearing capacity. If the engineering structure is not suitable for the use of prestressed tendons, it may be connected by anchor bolts. At this time, holes are opened in advance on the side of the bridge to be widened and on the side of the widening component. After the widening component is docked in place, anchor bolts are installed for connection. It should be noted that there are many anchoring methods, and the above methods are only for illustration and are not intended as specific limitations.

[0045] Furthermore, Figure 3A longitudinal cross-sectional view of a combined structure for widening a concrete bridge provided in an embodiment of the present application is shown in FIG. Figure 3 As shown, a plurality of ribbed units 103 arranged at intervals along the longitudinal direction of the bridge are provided at the bottom of the steel bridge deck 101, and a supporting inner web 104 is provided between two adjacent ribbed units 103. In a possible embodiment, the ribbed unit 103 is an inverted T-rib, and the web of the inverted T-rib is longitudinally arranged at the bottom of the steel bridge deck 101. The web of the inverted T-rib is horizontally arranged, which is located inside the web unit 2 and welded to the web unit 2 to form a whole. The vertical load of the steel bridge deck 101 is dispersed to the web unit 2 through the inverted T-rib. As an optional embodiment, a plurality of inverted T-ribs form a group, 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 steel bridge deck 101.

[0046] Furthermore, the bridge deck support plate 3 and the steel bridge deck plate 101 are spaced apart along the thickness direction of the bridge to be widened to form a pouring space for setting the steel-concrete joint section 4. Combined with the above description, the top surface of the steel bridge deck plate 101 is flush with the bridge deck to be widened, and the bridge deck support plate 3 supports the bottom surface of the bridge to be widened, so that the protruding transverse bridge steel bars of the bridge are embedded in the space between the bridge deck support plate 3 and the steel bridge deck plate 101, and then the steel-concrete joint section 4 is set in the space.

[0047] Furthermore, Figure 4 A cross-sectional view of a composite structure for widening a concrete bridge provided in an embodiment of the present application, as shown in FIG. Figure 4 As shown, the steel-concrete combined section 4 includes a plurality of longitudinal steel bars 401 for connecting to the protruding transverse steel bars of the bridge, and concrete poured in the pouring space. The protruding transverse steel bars of the bridge are vertically arranged to the longitudinal steel bars 401. In a possible implementation manner, in order to improve the connection stability between the two, during assembly, the protruding transverse steel bars of the bridge are first embedded in one end of the steel-concrete combined section 4 and bent to hook the longitudinal steel bars 401, and finally concrete is poured to form the steel-concrete combined section 4.

[0048] Furthermore, stirrup units 402 are provided on the longitudinal steel bars 401. The stirrup units 402 are bent and arranged on the outer peripheries of several longitudinal steel bars 401, and are bent into the concrete of the steel-concrete joint section 4 to increase the anchoring force. The stirrup units 402 are divided into multiple groups, and the multiple groups of stirrup units 402 are arranged at intervals along the length of the longitudinal steel bars 401. In a possible implementation manner, a stirrup unit 402 is provided at each splicing plate unit 5. Stirrups are a commonly used anchoring means in this field, and the specific posture and setting method will not be described in detail here.

[0049] Furthermore, a pouring notch 6 is provided at one end of the steel bridge deck 101 extending above the bridge deck support plate 3, and a pouring notch 6 is provided between each two adjacent splicing plate units 5. Figure 5A top view of a combined structure for widening a concrete bridge provided in an embodiment of the present application, wherein the pouring groove 6 can be in any shape such as a U-shape, and is mainly used to facilitate the discharge of concrete and the vibration of the 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, and the pouring groove 6 can facilitate the installation of the steel bars 401 along the bridge. After the overall assembly is completed, the pavement layer 102 is directly constructed on the steel bridge deck 101.

[0050] For further information, see Figure 4 The web unit 2 includes a pressure plate 201 and a sealing plate 202 located on the pressure plate 201 and away from the bridge to be widened. The pressure plate 201 and the sealing plate 202 are arranged along the width direction of the steel bridge deck 101. The above-mentioned connecting components are all welded to the pressure plate 201. The sealing plate 202 is arranged at the outermost side of the entire combined structure for edge sealing and improving aesthetics. In a possible embodiment, a side beam web 203 is also provided between the pressure plate 201 and the sealing plate 202. The side beam web 203 is arranged parallel to the pressure plate 201 and the sealing plate 202 along the thickness direction of the bridge to be widened as an internal reinforcement. Combined with the above description, the inverted T-rib webs in the inverted T-ribs of the ribbed unit 103 are respectively connected to the pressure plate 201 and the inner wall of the side beam web 203.

[0051] In a possible embodiment, the combined structure in the present application also includes a diagonal brace unit, which includes a steel diagonal brace 7. One end surface of the steel diagonal brace 7 is respectively connected to the bottom end of the pressure plate 201 and the bottom end of the closing plate 202, and the other end is used to connect to the side of the bridge beam to be widened. There are multiple steel diagonal braces 7, which are arranged equidistantly along the bridge direction. They can adopt box-type or I-shaped cross-sections. In actual applications, if the vehicle load verification of the widening component is passed, or the stiffness of the flange of the bridge to be widened is relatively large, the steel diagonal brace 7 can be omitted, and the widening component can be used as the main component. When the steel diagonal brace 7 is set, the length of the pressure plate 201 is greater than the length of the closing plate 202 to adapt to the inclination linearity of the steel diagonal brace 7.

[0052] Furthermore, the splicing plate unit 5 includes two PBL shear keys 501 arranged at intervals along the thickness direction of the bridge to be widened. The PBL shear keys 501 are plate-like structures and the two PBL shear keys 501 in the same splicing plate unit 5 are arranged at intervals up and down. One of the PBL shear keys 501 located at the top is connected to the pressure plate 201 on the side and the steel bridge deck 101 on the top, and the other PBL shear key 501 located at the bottom is connected to the pressure plate 201 on the side and the bridge deck support plate 3 on the bottom, and a plurality of connecting holes are opened on the PBL shear key 501, and the steel bars 401 along the bridge direction pass through the above-mentioned connecting holes to enhance the internal connection of the steel-concrete joint section 4 structure and the connection strength between the steel-concrete joint section 4 and the widening component.

[0053] The combined structure for widening concrete bridges in the present application can increase the stiffness of the flange of the bridge to be widened and improve the bearing capacity of the bridge after widening by utilizing the original structure of the bridge to be widened and cooperating with the clamping of the panel unit 1 and the bridge deck support plate 3; by providing a steel-concrete combined section 4 for embedding the protruding transverse bridge steel bars of the bridge, it can not only improve the connection stability at the widening point, but also transfer part of the load to the protruding transverse bridge steel bars of the bridge through the structural linkage effect, thereby reducing the stress at the widening point and reducing the risk of splitting at the widening point; in conjunction with the splicing plate unit 5, it can improve the internal structural stability of the steel-concrete combined section 4 and the connection strength between the steel-concrete combined section 4 and the widening component; the widening component and the connection component are all prefabricated in the factory. Unlike the widening method using concrete, there is no need to set up scaffolding and formwork on site, and there is no need to cast concrete structure. The construction efficiency is high and it also has higher durability, economy and coordination.

[0054] In a second aspect, an embodiment of the present application provides a construction method for constructing the above-mentioned bridge widening composite structure, the construction method comprising:

[0055] S1: Chisel off the guardrail of the bridge to be widened and cut the side of the bridge to be widened to expose the protruding cross-bridge steel bars of the bridge;

[0056] Before processing the bridge to be widened, the above-mentioned combined structure of the bridge to be widened, except for the steel-concrete joint section 4, other components are prefabricated in the factory. The span of the steel bridge deck 101 is determined according to the pre-loaded vehicle load and bearing performance. 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 subsequent passage of the steel bars 401 along the bridge. If the vehicle load is large, additional processing of the diagonal bracing steel is required, and the relative setting position of the bridge to be widened is ground and pre-drilled.

[0057] S2: hoisting 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 of the bridge to be widened, and the bridge deck support plate 3 is located on the bottom surface of the bridge to be widened;

[0058] S3: pouring the steel-concrete joint section 4 so that the protruding transverse bridge steel bars of the bridge are embedded in the steel-concrete joint section 4;

[0059] 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, and then the protruding transverse bridge steel bars of the bridge are bent and adjusted. Subsequently, the longitudinal steel bars 401 are passed through the bending area of ​​the protruding transverse bridge steel bars of the bridge and the splicing plate unit 5, and the stirrup units 402 are constructed. Finally, 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, to form a steel-concrete joint section 4.

[0060] In a possible implementation, the construction method in the present application also includes anchoring the widening component. If an anchor bolt is used, it can be installed on the side of the widening component before pouring concrete, and the anchor bolt rod extends into the steel-concrete joint section 4. The anchoring is completed after the concrete of the steel-concrete joint section 4 is formed. If a prestressed anchoring measure is adopted, before pouring the steel-concrete joint section 4, unbonded prestressed tendons are arranged, one end of which is anchored on the side of the widening component and the other end is anchored on the side of the bridge to be widened. After the concrete strength grade of the steel-concrete joint section 4 meets the requirements, prestress is applied to complete the anchoring. It should be noted that the anchoring forms include various forms, not limited to the above two types.

[0061] S4: Based on the hardness of the steel-concrete joint section 4, a pavement layer 102 is constructed to cover the steel bridge deck 101 and the bridge deck to be widened;

[0062] In a possible implementation, the pavement layer 102 can be divided into an ultra-high performance concrete layer and an asphalt layer, wherein the ultra-high performance concrete layer can be poured together with the concrete in the steel-concrete combined section 4, and then the asphalt layer is poured. Before pouring, the bridge deck to be widened is roughened and pre-wetted, and shear nails are arranged on the top surface of the steel bridge deck 101. Then, the longitudinal and transverse steel meshes are uniformly laid, 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.

[0063] The combined structure in the present application is arranged on both sides of the bridge to be widened. Therefore, after the widening and transformation of the single-span bridge to be widened is completed according to the above steps, the construction of another single-span bridge to be widened is then carried out.

[0064] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0065] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0066] The above is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A combined structure for widening a concrete bridge, characterized in that: include: A widening component, the widening component comprising a panel unit (1) and a web unit (2) located at the bottom of the panel unit (1), the panel unit (1) comprising a steel bridge deck (101) extending outward from the bridge deck to be widened and extending outward from the web unit (2) to be spaced a certain distance from the side of the bridge to be widened, and a pavement layer (102) covering the steel bridge deck (101) and the bridge deck to be widened; A connection assembly is arranged on the web unit (2), the connection assembly comprising 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 joint section (4) located between the bridge deck support plate (3) and the steel bridge deck (101) for embedding the protruding transverse bridge reinforcement of the bridge. The web unit (2) is also provided with a plurality of splicing plate units (5) arranged at intervals along the bridge direction to connect the steel-concrete joint section (4) and the widening assembly.

2. A combined structure for widening a concrete bridge as claimed in claim 1, characterized in that: The bottom of the steel bridge deck (101) is provided with a plurality of rib units (103) arranged at intervals along the bridge direction, and a supporting inner web (104) is provided between two adjacent rib units (103).

3. The combined structure for widening a concrete bridge according to claim 1, characterized in that: The bridge deck support plate (3) and the steel bridge deck (101) are arranged at intervals along the thickness direction of the bridge to be widened to form a pouring space for arranging the steel-concrete combined section (4).

4. A combined structure for widening a concrete bridge as claimed in claim 3, characterized in that: The steel-concrete combined section (4) comprises a plurality of longitudinal steel bars (401) for connecting with the protruding transverse steel bars of the bridge, and concrete poured into the pouring space.

5. The combined structure for widening a concrete bridge according to claim 4, characterized in that: The longitudinal reinforcement (401) is provided with a stirrup unit (402).

6. The combined structure for widening a concrete bridge according to claim 1, characterized in that: A pouring notch (6) is provided at one end of the steel bridge deck (101) extending above the bridge deck support plate (3), and a pouring notch (6) is provided between each two adjacent splicing plate units (5).

7. The combined structure for widening a concrete bridge according to claim 1, characterized in that: The web plate unit (2) comprises a pressure plate (201) and a sealing plate (202) located on the pressure plate (201) and away from the bridge to be widened.

8. The combined structure for widening a concrete bridge according to claim 1, characterized in that: The splicing plate unit (5) comprises two PBL shear keys (501) arranged at intervals along the thickness direction of the bridge to be widened.

9. The combined structure for widening a concrete bridge according to claim 7, characterized in that: The widening assembly also includes a diagonal bracing unit, which includes a steel diagonal brace (7), one end surface of the steel diagonal brace (7) is respectively connected to the bottom end of the pressure plate (201) and the bottom end of the sealing plate (202), and the other end is used for connecting to the bridge to be widened.

10. A construction method for constructing the combined structure according to any one of claims 1 to 9, characterized in that: The construction method comprises: Chisel away the guardrails of the bridge to be widened, and cut the sides of the bridge to be widened to expose the protruding cross-bridge steel bars of the bridge; Hoisting 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 of the bridge to be widened, and the bridge deck support plate (3) is located on the bottom surface of the bridge to be widened; Casting the steel-concrete joint section (4) so ​​that the protruding transverse bridge reinforcement of the bridge is embedded in the steel-concrete joint section (4); Based on the hardness of the steel-concrete joint 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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