Steel-concrete composite beam connecting structure

Abstract

The application relates to a steel-concrete combined beam connecting structure, which comprises a bridge deck slab, a notch through the bridge deck slab in the thickness direction, a pre-embedded steel bar net and a first reinforcing steel bar in the bridge deck slab, a plane formed by the first reinforcing steel bar being consistent with the transverse bridge direction and being perpendicular to the steel bar net, a steel beam arranged below the bridge deck slab, a shear pin arranged on the upper end surface of the steel beam in the notch, and a second reinforcing steel bar arranged in the notch, a plane formed by the second reinforcing steel bar being parallel to the plane formed by the first reinforcing steel bar. Since the first reinforcing steel bar and the second reinforcing steel bar are connected with the steel bar net, the steel bar net, the first reinforcing steel bar, the second reinforcing steel bar and the shear pin form a shear connector. The components work cooperatively, the stress of the bridge deck slab in the horizontal plane and the longitudinal direction is improved, and the shear and bending bearing capacity of the steel-concrete connecting part is improved.

Description

Technical Field

[0001] This application relates to the field of bridge engineering technology, and in particular to a steel-concrete composite beam connection structure. Background Technology

[0002] Steel-concrete composite beams are widely used in various types of long-span bridges. Concrete, as a traditional building material, has high compressive strength, mature construction technology, and low maintenance workload, but its tensile strength is relatively low and its self-weight is heavy, making it difficult to complete large spans. Steel beams, on the other hand, are lightweight and strong. Combining the two materials can fully utilize their respective performance advantages to meet the stress requirements of long-span bridge structures. The connection strength of the steel-concrete joint is crucial to structural safety and later maintenance; therefore, the design of shear connectors is one of the key points of steel-concrete composite structures.

[0003] In traditional steel-concrete composite beams, studs of equal length are welded to the upper edge of the top slab of the steel beam. The bridge deck has pre-drilled slots, and horizontal longitudinal and transverse reinforcing bars are placed within the deck, exposed within the slots. After the bridge deck is erected above the steel beams, concrete is poured into the slots to form a monolithic structure. This connection between horizontal reinforcing bars and studs has a low shear capacity reserve, making the concrete slab prone to cracking under repeated wheel loads. Furthermore, the numerous horizontal reinforcing bars within the slots can easily collide with the studs during hoisting, affecting construction efficiency. In special cases, the reinforcing bars may need to be cut before installation, resulting in poor construction convenience. Summary of the Invention

[0004] This application provides a steel-concrete composite beam connection structure to solve the problem in related technologies where the steel beam top plate is welded with studs of equal length, and the bridge deck is equipped with horizontal longitudinal and transverse steel bars, resulting in a small reserve of shear bearing capacity.

[0005] Firstly, a steel-concrete composite beam connection structure is provided, including:

[0006] The bridge deck has a slot through it along the thickness direction. A steel mesh and a first reinforcing steel bar are embedded in the bridge deck. The plane formed by the first reinforcing steel bar is consistent with the transverse direction of the bridge and is perpendicular to the steel mesh.

[0007] A steel beam is installed below the bridge deck, and shear studs are provided in the slot on its upper end face;

[0008] A second reinforcing bar is disposed in the groove and connected to the reinforcing mesh, and the plane formed by the second reinforcing bar is parallel to the plane formed by the first reinforcing bar.

[0009] In some embodiments, the second reinforcing bar is a closed-loop ring-shaped reinforcing bar.

[0010] In some embodiments, the first reinforcing bar includes a first reinforcing bar and a second reinforcing bar disposed within the bridge deck. The first reinforcing bar and the second reinforcing bar have open ends facing each other within the bridge deck, and during installation, the opening direction is consistent with the transverse direction of the bridge.

[0011] In some embodiments, a connecting steel bar is connected to one end of the open end of the first and second steel bars, and during installation, the connecting steel bar is close to the steel beam.

[0012] In some embodiments, the length of the shear studs at the edge of the slot is greater than the length of the shear studs at other locations within the slot.

[0013] In some embodiments, the density of the first reinforcing bar in the concrete area of ​​the bridge deck is greater than its density in the slot.

[0014] In some embodiments, the second reinforcing bar is installed after the bridge deck is hoisted.

[0015] In some embodiments, along the axial direction of the slot, the inner diameter of the slot near the steel beam end is larger than the inner diameter of the other end.

[0016] In some embodiments, the steel mesh includes longitudinal and transverse steel bars arranged perpendicularly to each other, wherein the longitudinal steel bars are arranged in the bridge direction and their density is greater than that of the transverse steel bars.

[0017] Secondly, a bridge is provided, including the aforementioned steel-concrete composite beam connection structure.

[0018] This application provides a steel-concrete composite beam connection structure. A first reinforcing bar is installed within the bridge deck, its surface aligned with the transverse direction and perpendicular to the reinforcing mesh. After hoisting, a second reinforcing bar is installed within a slot. Finally, concrete is poured to form a continuous through-slot, creating a shear-resistant connector. These components work together to improve the horizontal and longitudinal stress on the bridge deck, enhancing the shear and bending capacity of the steel-concrete connection. By locally reinforcing with the second reinforcing bar, the connection structure is strengthened from within, enhancing its ability to resist various complex stress conditions. This allows the entire steel-concrete composite beam connection structure to better ensure structural stability and safety when subjected to external forces such as vehicle traffic and wind loads.

[0019] Compared with related technologies where only studs of equal length are welded to the top edge of the steel beam and only horizontal longitudinal and transverse steel bars are configured in the bridge deck, the construction method of this application can not only better cope with the shear and bending deformation that may occur under different load conditions and reduce the safety hazards caused by insufficient structural bearing capacity, but also reduce the collision between the pre-embedded steel bars in the bridge deck and the pre-welded studs of the steel beam, which facilitates rapid construction. Attached Figure Description

[0020] 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.

[0021] Figure 1 This is a schematic cross-sectional view of the steel-concrete composite beam connection structure provided in the embodiments of this application;

[0022] Figure 2 A schematic diagram of the AA cross-sectional structure of the steel-concrete composite beam connection structure provided in the embodiments of this application.

[0023] In the diagram: 1. Steel beam; 2. Bridge deck; 3. Groove; 4. Shear stud; 5. First reinforcing bar; 51. First reinforcing bar; 52. Second reinforcing bar; 53. Connecting reinforcing bar; 6. Second reinforcing bar; 7. Reinforcing mesh; 71. Longitudinal reinforcing bar; 72. Transverse reinforcing bar. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] This application provides a steel-concrete composite beam connection structure that can solve the problem in related technologies where the top edge of the steel beam is welded with studs of equal length, and the bridge deck is equipped with horizontal longitudinal and transverse steel bars, resulting in a small reserve of shear bearing capacity.

[0026] like Figure 1 and Figure 2 As shown, a steel-concrete composite beam connection structure includes:

[0027] Bridge deck 2 has a slot 3 through it along the thickness direction of bridge deck 2. Steel mesh 7 and first reinforcing steel 5 are pre-embedded in bridge deck 2. The plane formed by the first reinforcing steel 5 is consistent with the transverse direction of the bridge and is perpendicularly connected to the steel mesh 7.

[0028] Steel beam 1 is located below bridge deck 2, and shear studs 4 are provided in the slot 3 on its upper end face;

[0029] The second reinforcing bar 6 is set in the groove 3 and connected to the reinforcing mesh 7. The plane formed by the second reinforcing bar 6 is parallel to the plane formed by the first reinforcing bar 5.

[0030] This application provides a steel-concrete composite beam connection structure. A first reinforcing bar 5 is installed within the bridge deck 2, its surface aligned with the transverse direction and perpendicular to the reinforcing mesh 7. After hoisting, a second reinforcing bar 6 is installed within the slot 3. Finally, concrete is poured through the slot 3 to form a unified structure, allowing the second reinforcing bar 6, the first reinforcing bar 5, shear studs 4, and the ordinary reinforcing mesh 7 to form a shear-resistant connector. These components work together to improve the horizontal and longitudinal stress on the bridge deck, enhancing the shear and bending bearing capacity of the steel-concrete connection. By locally reinforcing with the second reinforcing bar 6, the connection structure is strengthened from within, enhancing its ability to resist various complex stress conditions. This allows the entire steel-concrete composite beam connection structure to better ensure structural stability and safety when subjected to external forces such as vehicle traffic and wind loads.

[0031] Compared with related technologies where only studs of equal length are welded to the top edge of the steel beam and only horizontal longitudinal and transverse steel bars are configured in the bridge deck, the construction method of this application can not only better cope with the shear and bending deformation that may occur under different load conditions and reduce the safety hazards caused by insufficient structural bearing capacity, but also reduce the collision between the pre-embedded steel bars in the bridge deck and the pre-welded studs of the steel beam, which facilitates rapid construction.

[0032] The second reinforcing bar 6 is a closed-loop ring bar. The closed-loop ring bar is formed by two horizontal bars and two vertical bars. After the bridge deck is hoisted, the closed-loop ring bar passes around the reinforcing mesh 7 in the slot 3 and is connected to the reinforcing mesh 7 by welding or binding. The two horizontal bars of the closed-loop ring bar can improve the bending resistance, and the two vertical bars can improve the shear resistance.

[0033] The first reinforcing bar 5 includes a first reinforcing bar 51 and a second reinforcing bar 52 installed within the bridge deck 2. The first reinforcing bar 51 and the second reinforcing bar 52 have open ends facing each other within the bridge deck 2, and during installation, the opening direction is consistent with the transverse direction of the bridge. Both the first reinforcing bar 51 and the second reinforcing bar 52 are U-shaped, and the U-shaped openings are arranged facing each other, which can improve the shear resistance of the bridge deck 2.

[0034] One end of the open end of the first reinforcing bar 51 and the second reinforcing bar 52 is connected to a connecting reinforcing bar 53. During installation, the connecting reinforcing bar 53 is close to the steel beam 1. The open end of the U-shaped reinforcing bar has two ends, which are fixed to the reinforcing mesh 7. The bottom of the first reinforcing bar 51 and the second reinforcing bar 52 are connected, and the upper part does not extend into the groove 3, reducing the number of reinforcing bars at the top of the groove 3 and facilitating concrete pouring and vibration. The connecting reinforcing bar 53 can improve the bending resistance of the bridge deck.

[0035] In this application, both the first reinforcing bar 5 and the second reinforcing bar 6 are stirrups, which have a stronger shear resistance.

[0036] The shear studs 4 at the edge of the slot 3 are longer than those at other locations within the slot 3. When the structure is under load, the joints typically experience greater stress concentration, including shear force, tension, and bending moment. Longer shear studs 4 better connect the bridge deck 2 to the steel beam 1, effectively transferring stress through their greater anchorage length and higher pull-out and shear resistance, preventing debonding and slippage in this area, and ensuring the structural integrity and collaborative performance.

[0037] like Figure 2 As shown, the density of the first reinforcing steel bar 5 in the concrete area of ​​the bridge deck 2 is greater than its density in the slot 3. The concrete area of ​​the bridge deck 2 bears the main load and requires a higher density of reinforcing steel bars to ensure its load-bearing capacity. By increasing the density of the first reinforcing steel bar 5 in this area, the overall strength and stiffness of the bridge deck 2 under vehicle loads, its own weight, and various environmental loads can be improved more effectively, preventing concrete cracking and deformation. A smaller number of first reinforcing steel bars 5 are placed in the slot 3 area to reduce collisions with shear studs during the hoisting of the bridge deck 2, facilitating installation.

[0038] The second reinforcing steel bar 6 will be installed after the bridge deck 2 is hoisted. After the bridge deck 2 is hoisted, the second reinforcing steel bar 6 will be installed in the slot 3. After the through slot 3 is poured with concrete to form a whole, the second reinforcing steel bar 6, together with the first reinforcing steel bar 5, shear studs 4 and ordinary steel mesh 7, will form a shear-resistant connector to jointly bear the internal forces of the structure and improve the longitudinal stress of the bridge deck 2.

[0039] Along the axis of slot 3, the inner diameter of the end of slot 3 closest to steel beam 1 is larger than the inner diameter of the other end. Slot 3 is larger at the bottom and smaller at the top, forming a trapezoidal or frustum-shaped structure. This reduces the weakening of the overall cross-section of the precast bridge deck 2, ensures the structural safety of the thin-walled sections on both sides of slot 3 during hoisting, and enhances the bond strength between the slot concrete and the bridge deck 2, preventing loosening between the slot concrete and the bridge deck 2 under bridge deck live load.

[0040] The reinforcing mesh 7 includes longitudinal reinforcing bars 71 and transverse reinforcing bars 72 arranged perpendicularly to each other. The longitudinal reinforcing bars 71 are arranged along the bridge direction and their density is greater than that of the transverse reinforcing bars 72. The transverse reinforcing bars 72 have a lower density, which reduces the collision between the bridge deck 2 and the shear studs 4 during hoisting. After hoisting, the transverse reinforcement of the bridge deck 2 is locally reinforced by the second reinforcing bar 6, which not only facilitates installation but also improves the overall shear and bending resistance of the structure, and significantly improves the connection strength and load-bearing capacity of the steel-concrete joint.

[0041] This application also provides a bridge constructed using the aforementioned steel-concrete composite beam connection structure.

[0042] During the prefabrication of bridge deck 2, the steel mesh 7 is first laid out, followed by the first reinforcing steel bar 5 according to the optimized density. High-quality concrete is used for the prefabrication of bridge deck 2. Shear studs 4 are arranged on the steel beam according to the size of the groove 3 of the prefabricated bridge deck 2. The bridge deck 2 is then hoisted onto the steel beam 1, with the shear studs 4 positioned within the groove 3. After hoisting, the second reinforcing steel bar 6 is installed, bypassing the steel mesh 7 within the groove 3 and securely connected to it. Concrete is then poured into the groove to complete the construction.

[0043] For the installation process of steel beam 1 and bridge deck 2, due to the differentiated design of shear studs 4, the setting of the density of the first reinforcing steel bar 5, and the setting of the longitudinal and transverse density of the steel mesh 7, the bridge deck 2 can be connected to the steel beam 1 more smoothly when hoisting, reducing the risk of collision with the shear studs 4 during construction, while ensuring the connection quality.

[0044] Meanwhile, since the first reinforcing bar 5 is connected to the reinforcing mesh 7, and the second reinforcing bar 6 is also connected to the reinforcing mesh 7, the reinforcing mesh 7, together with the first reinforcing bar 5, the second reinforcing bar 6, and the shear studs 4, forms a shear-resistant connector. These components work together to improve the stress on the bridge deck 2 in both the horizontal and longitudinal planes, and to improve the shear and bending bearing capacity of the steel-concrete connection.

[0045] 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.

[0046] 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 said element.

[0047] The above description is merely a specific embodiment 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 steel-concrete composite beam connection structure, characterized in that, include: The bridge deck (2) has a slot (3) through it along the thickness direction. The bridge deck (2) is pre-embedded with a steel mesh (7) and a first reinforcing steel bar (5). The plane formed by the first reinforcing steel bar (5) is consistent with the transverse direction of the bridge and is perpendicularly connected to the steel mesh (7). A steel beam (1) is set below the bridge deck (2), and shear studs (4) are provided in the slot (3) on its upper end face. The second reinforcing bar (6) is set in the groove (3) and connected to the reinforcing mesh (7), and the plane formed by the second reinforcing bar (6) is parallel to the plane formed by the first reinforcing bar (5); The density of the first reinforcing steel bar (5) in the concrete area of ​​the bridge deck (2) is greater than its density in the slot (3); The steel mesh (7) includes longitudinal steel bars (71) and transverse steel bars (72) arranged perpendicularly to each other. The longitudinal steel bars (71) are arranged along the bridge direction and their density is greater than that of the transverse steel bars (72). The second reinforcing steel bar (6) will be installed after the bridge deck (2) is hoisted; The second reinforcing bar (6) is a closed ring bar. The closed ring bar is formed by two horizontal bars and two vertical bars. The closed ring bar passes around the steel mesh 7 in the slot (3) and is connected to the steel mesh (7). The two horizontal bars of the closed ring bar are used to improve the bending resistance, and the two vertical bars are used to improve the shear resistance. The first reinforcing bar (5) includes a first reinforcing bar (51) and a second reinforcing bar (52) disposed in the bridge deck (2). The first reinforcing bar (51) and the second reinforcing bar (52) have open ends facing each other in the bridge deck (2). During installation, the opening direction is consistent with the transverse direction of the bridge. One end of the open end of the first reinforcing bar (51) and the second reinforcing bar (52) is connected to a connecting reinforcing bar (53), and during installation, the connecting reinforcing bar (53) is close to the steel beam (1).

2. The steel-concrete composite beam connection structure as described in claim 1, characterized in that: The length of the shear studs (4) at the edge of the slot (3) is greater than the length of the shear studs (4) at other positions inside the slot (3).

3. The steel-concrete composite beam connection structure as described in claim 1, characterized in that: Along the axial direction of the slot (3), the inner diameter of the slot (3) at the end near the steel beam (1) is larger than the inner diameter at the other end.

4. A bridge, characterized in that: Includes the steel-concrete composite beam connection structure as described in any one of claims 1 to 3.

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