Concrete laminated slab-box type composite beam bridge structure

Abstract

The utility model relates to the technical field of composite beam bridge structures, in particular to a concrete laminated slab-box type composite beam bridge structure. According to the technical scheme, the structure comprises a precast concrete box beam and a concrete precast slab located at the upper end of the precast concrete box beam, and additional steel bars are arranged at the upper ends of the two sides of the precast concrete box beam; the structure further comprises a post-cast reinforced concrete layer and a cantilever construction supporting assembly. And the post-cast reinforced concrete layer is arranged above the precast concrete box beam and the concrete precast slab. According to the prefabricated concrete box beam, only a part of supports are reserved on the upper flange of the prefabricated concrete box beam and used for erecting the prefabricated concrete planks and placing additional steel bars, and compared with a traditional prefabricated box beam, the self weight of a prefabricated beam body is reduced; a slotted concrete precast slab technology is adopted, overhanging steel bars at the plate end of a traditional precast slab are omitted, position conflicts between the overhanging steel bars and between the overhanging steel bars and U-shaped joint bars are avoided, the steel bar consumption is low, the installation efficiency is high, and the overall durable effect is improved.

Description

Technical Field

[0001] The present application relates to the technical field of composite beam bridge structures, and in particular to a concrete composite slab-box composite beam bridge structure. Background Art

[0002] Concrete box composite beam bridges utilize concrete box beams as their primary load-bearing structure. These bridges typically consist of concrete top and bottom slabs, webs, and diaphragms, forming a closed or semi-closed box structure. Composite box beams are a novel bridge structure, an improvement over traditional concrete bridges. They are widely used in highway and urban bridges, offering significant advantages, particularly in the construction of long-span bridges.

[0003] The concrete composite slab-box composite beam bridge structure applies the concrete composite slab to the superstructure (bridge deck structure) of the concrete box composite beam, which can further bring out the advantages of both.

[0004] The existing concrete box beams have a relatively complex supporting structure, are heavy, and require complex installation procedures. Furthermore, the beams have extended stirrups at the top, resulting in suboptimal pullout and shear resistance. Furthermore, the beams occupy a large space, making them difficult to transport and install. Therefore, this application proposes a concrete composite slab-box beam bridge structure. Utility Model Content

[0005] The purpose of this application is to address the technical problems pointed out in the background technology and propose a concrete composite slab-box beam bridge structure.

[0006] The technical solution of the present application is a concrete composite slab-box beam bridge structure, comprising a precast concrete box beam and a precast concrete slab located at the upper end thereof, wherein the upper ends of both sides of the precast concrete box beam are provided with additional steel bars;

[0007] It also includes post-cast reinforced concrete layers and cantilever construction support components;

[0008] The post-cast reinforced concrete layer is arranged above the precast concrete box beam and the precast concrete slab;

[0009] The cantilever construction support assembly is arranged on the outer sides of the precast concrete box beams on both sides.

[0010] Preferably, the cross-section of the precast concrete box beam is open, and vertical notches are provided on the upper parts of the upper flanges on both sides of the precast concrete box beam.

[0011] Preferably, the ends of the precast concrete panels are provided with panel end notches, and the top surfaces of the precast concrete panels are roughened and provided with shear reinforcement bars;

[0012] The end of the precast concrete panel is overlapped on the upper flange of the precast concrete box beam.

[0013] Preferably, the additional steel bars include U-shaped dowel bars and plate end notch steel bars, the U-shaped dowel bars are inserted into the vertical notches on the upper part of the upper flange of the precast concrete box beam and extend into the post-cast concrete layer, and the plate end notch steel bars are arranged between the plate end notches of adjacent concrete precast plates.

[0014] Preferably, the post-cast reinforced concrete layer includes post-cast layer steel bars and post-cast layer concrete. After the post-cast layer concrete solidifies, the post-cast reinforced concrete layer is combined with the precast concrete box beam, the precast concrete slab, and the additional steel bars to form a whole and jointly participate in the load bearing.

[0015] Preferably, the cantilever construction support assembly includes a support plate arranged on the side wall of the precast concrete box beam, the support plate is pre-anchored on the outer side web of the precast concrete box beam side beam by bolts, and the side wall of the support plate is connected to the support plate by a plurality of diagonal braces.

[0016] Preferably, the top of the support plate is kept horizontal, and the support plate and the top of the upper flange of the precast concrete box beam are at the same elevation.

[0017] Preferably, a transverse connecting member is connected between two adjacent precast concrete box beams, and the transverse connecting member includes a pre-anchored end plate connected to the side walls of the two adjacent precast concrete box beams, and the close sides of the two pre-anchored end plates are connected to the transverse connecting beam through a splicing plate.

[0018] Compared with the prior art, this application has the following beneficial technical effects:

[0019] In this application, only a part of the support is retained on the upper flange of the precast concrete box beam for erecting precast concrete slabs and placing additional steel bars. Compared with traditional precast box girders, the deadweight of the precast beam body is reduced; and the slotted concrete precast slab technology is adopted to eliminate the protruding steel bars (beard bars) at the ends of traditional precast slabs, thereby avoiding position conflicts between the protruding steel bars and between the protruding steel bars and the U-shaped dowel bars. The structure is simple, the steel bar usage is low, and the installation efficiency is high.

[0020] In this application, the precast concrete slab serves as the bottom formwork for the construction of the cast-in-place concrete layer, reducing the amount of formwork and support engineering; the cast-in-place layer can also serve as a leveling layer, eliminating the need to lay a concrete leveling layer on the top surface of the bridge, reducing material usage and lowering the deadweight of the structure; the precast concrete slab is placed on the precast beam body (precast concrete box beam body). After the construction of the post-cast layer is completed, the joints between the new and old concrete avoid the critical sections of the slab that are subject to bending and shearing, thereby avoiding the problem of cracking of wet joints under long-term wheel loads.

[0021] In this application, the bridge deck structure adopts the form of concrete composite slabs. Compared with precast box girders that are only cast after hanging formwork at wet joints, the post-cast concrete of the composite slabs can connect the precast concrete box girders, precast concrete slabs and additional steel bars into a whole, and the integrity of the entire bridge is better; the extended stirrups on the top of the beam are eliminated and replaced with U-shaped inserted bars installed later, avoiding the stirrups of the beam body serving as both the vertical shear resistance of the beam body and the pull-out and shear resistance of the precast-post-cast horizontal interface, so that the pull-out and shear resistance of the horizontal interface can be designed in a targeted manner according to the stress characteristics; at the same time, the elimination of the extended stirrups reduces the space occupied by the precast beam body, facilitates the improvement of storage and transportation efficiency, and is more convenient to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional diagram of the concrete composite slab-box beam bridge structure;

[0023] Figure 2 This is the main view of the concrete composite slab-box beam bridge structure;

[0024] Figure 3 It is a schematic diagram of the structure of the horizontal connecting member in this application;

[0025] Figure 4 It is a structural diagram of the precast concrete box beam in this application;

[0026] Figure 5 This is a schematic diagram of the connection structure between the precast concrete box beam and the transverse connecting member in this application;

[0027] Figure 6 This is a schematic diagram of the connection structure between the cantilever construction support assembly and the precast concrete box beam in this application;

[0028] Reference numerals: 1, precast concrete box beam; 21, precast concrete slab; 22, slab end notch; 23, shear reinforcement;

[0029] 4. Post-cast reinforced concrete layer; 5. Additional reinforcement; 31. Slab end notch reinforcement; 32. U-shaped dowel bars; 33. Vertical notch;

[0030] 6. Cantilever construction support assembly; 61. Support plate; 62. Diagonal brace; 63. Bolt;

[0031] 7. Transverse connecting piece; 71. Transverse connecting beam; 72. Splicing plate; 73. Pre-anchored end plate. DETAILED DESCRIPTION

[0032] The technical solution of the present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] The components of the embodiments of the present application generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the present application.

[0034] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0035] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," "the other end," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0037] Example

[0038] like Figure 1-6As shown, the concrete composite slab-box composite beam bridge structure proposed in this application includes a precast concrete box beam 1 and a precast concrete slab 21 located at its upper end. The end of the precast concrete slab 21 is provided with a plate end notch 22. The top surface of the precast concrete slab 21 is roughened and provided with shear reinforcement 23. The end of the precast concrete slab 21 is overlapped on the upper flange of the precast concrete box beam 1. Additional reinforcement 5 is provided on both upper ends of the precast concrete box beam 1. The cross-section of the precast concrete box beam 1 is open, and vertical notches 33 are provided on the upper portion of both upper flanges of the precast concrete box beam 1. Only a portion of the upper flange of the precast concrete box beam 1 is retained for supporting the precast concrete slab 21 and placing the additional reinforcement 5. Compared with traditional precast box beams, this reduces the weight of the precast beam body. The use of slotted precast concrete slab technology eliminates the overhanging steel bars at the ends of traditional precast slabs, avoiding conflicts between the overhanging steel bars and between the overhanging steel bars and the U-shaped dowel bars. This results in a simple structure, low steel usage, and high installation efficiency. The precast concrete slab 21 serves as the base formwork for the cast-in-place concrete layer, reducing formwork and support work. The cast-in-place layer also serves as a leveling layer, eliminating the need for a concrete leveling layer on the bridge top surface, reducing material usage and lowering the structure's deadweight.

[0039] It also includes a post-cast reinforced concrete layer 4 and a cantilever construction support assembly 6.

[0040] Specifically, the post-cast reinforced concrete layer 4 is placed above the precast concrete box beam 1 and the precast concrete slab 21; the precast concrete slab 21 rests on the beam body of the precast concrete box beam 1. After the post-cast layer is completed, the joint between the new and old concrete avoids the critical bending and shear sections of the slab, preventing cracking of the wet joint under long-term wheel loads. The cantilever construction support assembly 6 is installed on the outside of the precast concrete box beam 1 on both sides.

[0041] In this embodiment, the additional steel bars 5 include U-shaped dowel bars 32 and plate end notch steel bars 31. The U-shaped dowel bars 32 are inserted into the vertical notches 33 on the upper part of the upper flange of the precast concrete box beam 1 and extend into the post-cast concrete layer 4. The plate end notch steel bars 31 are arranged between the plate end notches 22 of adjacent concrete precast panels 21 to ensure the stability of the support.

[0042] Furthermore, the post-cast reinforced concrete layer 4 includes post-cast layer steel bars and post-cast layer concrete. After the post-cast layer concrete solidifies, the post-cast reinforced concrete layer 4 is combined with the precast concrete box beam 1, the precast concrete panel 21, and the additional steel bars 5 to form a whole and jointly participate in the load.

[0043] Specifically, the cantilever construction support assembly 6 includes a support plate installed on the side wall of the precast concrete box beam 1. The support plate is pre-anchored to the outer side web of the precast concrete box beam 1 via bolts 63. The side wall of the support plate is connected to a support plate 61 via a plurality of diagonal braces 62. The top of the support plate 61 remains horizontal and is at the same elevation as the top of the upper flange of the precast concrete box beam 1.

[0044] In this embodiment, a transverse connecting member 7 is connected between two adjacent precast concrete box beams 1. Specifically, the transverse connecting member 7 includes a pre-anchored end plate 73 connected to the side walls of the two adjacent precast concrete box beams 1. The two pre-anchored end plates 73 are connected to a transverse connecting beam 71 on their adjacent sides via a splicing plate 72. The transverse connecting beam 71 is used as a connecting member between the precast concrete box beams 1 at the transverse connection position. The pre-anchored end plates 73 are embedded into the precast concrete box beams 1 via studs during the factory prefabrication stage and are bolted to the transverse connecting beam 71 via the splicing plate 72. This improves the lateral stiffness and integrity of the concrete box beams 1 during construction and use.

[0045] In summary, in this application, the precast concrete slab 21 is placed on the precast beam body (precast concrete box beam body). After the post-cast layer is constructed, the joints between the new and old concrete avoid the key sections of the slab that are subjected to bending and shear, avoiding the problem of cracking of wet joints under long-term wheel loads. The bridge deck structure adopts the form of a concrete composite slab composite beam. Compared with the precast box beam that is only cast at the wet joint, the composite slab post-cast concrete can connect the precast concrete box beam 1, the precast concrete slab 21 and the additional steel bars 5 into a whole, and the integrity of the entire bridge is better. In this application, a precast concrete box beam 1 is adopted, and the extended stirrups at the top of the beam are eliminated and replaced with U-shaped dowel bars 32 installed later, avoiding the beam body stirrups serving as both the vertical shear resistance of the beam body and the pull-out and shear resistance of the precast-post-cast horizontal interface, so that the pull-out and shear resistance of the horizontal interface can be designed according to the force characteristics; at the same time, the elimination of the extended stirrups reduces the space occupied by the precast beam body, which is convenient for improving storage and transportation efficiency.

[0046] The above specific embodiments are merely preferred embodiments of the present application. Based on the technical solutions of the present application and the relevant inspirations of the above embodiments, those skilled in the art may make various alternative improvements and combinations of the above specific embodiments. The above specific embodiments are merely explanations of the present application and are not limitations of the present application.

Claims

1. Concrete composite slab-box composite beam bridge structure, characterized by: It comprises a precast concrete box beam (1) and a precast concrete slab (21) located at the upper end thereof, wherein the upper ends of both sides of the precast concrete box beam (1) are provided with additional steel bars (5); It also includes a post-cast reinforced concrete layer (4) and a cantilever construction support assembly (6); The post-cast reinforced concrete layer (4) is arranged above the precast concrete box beam (1) and the precast concrete slab (21); The cantilever construction support assembly (6) is arranged outside the precast concrete box beam (1) on both sides.

2. The concrete composite slab-box beam bridge structure according to claim 1, characterized in that: The cross section of the precast concrete box beam (1) is open, and vertical notches (33) are provided on the upper parts of the upper flanges on both sides of the precast concrete box beam (1).

3. The concrete composite slab-box beam bridge structure according to claim 2, characterized in that: The end of the concrete precast plate (21) is provided with a plate end notch (22), and the top surface of the concrete precast plate (21) is roughened and provided with shear reinforcement (23); The end of the precast concrete panel (21) is overlapped on the upper flange of the precast concrete box beam (1).

4. The concrete composite slab-box beam bridge structure according to claim 3, characterized in that: The additional reinforcement (5) comprises a U-shaped inserted reinforcement (32) and a plate end notch reinforcement (31), wherein the U-shaped inserted reinforcement (32) is inserted into a vertical notch (33) at the upper portion of the upper flange of the precast concrete box beam (1) and extends into the post-cast concrete layer (4), and the plate end notch reinforcement (31) is arranged between the plate end notches (22) of adjacent concrete precast panels (21).

5. The concrete composite slab-box beam bridge structure according to claim 1, characterized in that: The post-cast reinforced concrete layer (4) comprises post-cast layer steel bars and post-cast layer concrete. After the post-cast layer concrete solidifies, the post-cast reinforced concrete layer (4) is combined with the precast concrete box beam (1), the precast concrete slab (21), and the additional steel bars (5) to form a whole and participate in bearing force together.

6. The concrete composite slab-box beam bridge structure according to claim 5, characterized in that: The cantilever construction support assembly (6) comprises a support plate arranged on the side wall of the precast concrete box beam (1), the support plate being pre-anchored on the outer side web of the precast concrete box beam (1) via bolts (63), and the side wall of the support plate being connected to a support plate (61) via a plurality of diagonal braces (62).

7. The concrete composite slab-box beam bridge structure according to claim 6, characterized in that: The top of the support plate (61) remains horizontal, and the support plate (61) and the top of the upper flange of the precast concrete box beam (1) are located at the same elevation.

8. The concrete composite slab-box beam bridge structure according to claim 4, characterized in that: A transverse connecting member (7) is connected between two adjacent precast concrete box beams (1), and the transverse connecting member (7) includes a pre-anchored end plate (73) connected to the side walls of the two adjacent precast concrete box beams (1), and the adjacent sides of the two pre-anchored end plates (73) are connected to the transverse connecting beam (71) through a splicing plate (72).

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