Steel-concrete composite beam connecting structure

Abstract

The invention relates to a steel-concrete composite beam connecting structure which comprises a bridge deck slab, a notch is formed in the thickness direction of the bridge deck slab in a penetrating mode, a reinforcing mesh and first reinforcing steel bars are embedded in the bridge deck slab, and the plane formed by the first reinforcing steel bars is consistent with the transverse bridge direction and is perpendicular to the reinforcing mesh; the steel beam is arranged below the bridge deck slab, and shear nails are arranged in notches in the upper end face of the steel beam; the second reinforcing steel bars are arranged in the notches, and the plane formed by the second reinforcing steel bars is parallel to the plane formed by the first reinforcing steel bars. Due to the fact that the first reinforcing steel bars and the second reinforcing steel bars are connected with the reinforcing mesh, the reinforcing mesh, the first reinforcing steel bars, the second reinforcing steel bars and the shear nails jointly form the 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 resistance and bending resistance bearing capacity of the steel-concrete connecting part are improved.

Description

Technical Field

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

[0002] Steel-concrete composite beams are widely used in different types of medium and long span bridges. As a traditional building material, concrete has high compressive strength, mature construction technology, and small maintenance workload, but low tensile strength and heavy weight, making it difficult to complete large spans. Steel beams are light and strong. The combination of the two materials can make full use of their respective performance advantages to meet the force requirements of long-span bridge structures. The connection strength of the steel-concrete joint is crucial to structural safety and subsequent maintenance. The design of shear connectors is one of the key points of steel-concrete composite structures.

[0003] In traditional steel-concrete composite beams, bolts of equal length are welded on the upper edge of the top plate of the steel beam, notches are reserved in the bridge deck, and horizontal longitudinal and transverse steel bars are arranged in the bridge deck. The steel bars are exposed within the notch range. After the bridge deck is erected above the steel beam, concrete is poured in the notch to form a whole. This connection structure of horizontal steel bars and bolts has a small shear bearing capacity reserve, and the concrete slab is prone to cracking under the repeated action of wheel loads. In addition, there are many horizontal steel bars within the notch range, which are easy to collide with the bolts during hoisting, affecting construction efficiency. In special cases, the steel bars need to be cut and disconnected before installation, and the construction convenience is poor. Summary of the invention

[0004] The embodiment of the present application provides a steel-concrete composite beam connection structure to solve the problem in the related art that bolts of equal length are welded on the upper edge of the steel beam top plate, horizontal longitudinal and transverse steel bars are arranged in the bridge deck, and the shear bearing capacity reserve is small.

[0005] In a first aspect, a steel-concrete composite beam connection structure is provided, comprising:

[0006] A bridge deck having a notch extending through it in a thickness direction of the bridge deck, wherein a steel mesh and a first reinforcing steel bar are embedded in the bridge deck, wherein a plane formed by the first reinforcing steel bar is consistent with a transverse direction of the bridge and is vertically connected to the steel mesh;

[0007] A steel beam is arranged below the bridge deck, and a shear nail is arranged in a notch on the upper end surface of the steel beam;

[0008] The second reinforcing steel bar is arranged in the notch and connected to the steel mesh, and the plane formed by the second reinforcing steel bar is parallel to the plane formed by the first reinforcing steel bar.

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

[0010] In some embodiments, the first reinforcing steel bar includes a first steel bar and a second steel bar arranged in the bridge deck, and the first steel bar and the second steel bar have open ends facing each other in the bridge deck. When installed, the opening direction is consistent with the transverse direction of the bridge.

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

[0012] In some embodiments, the length of the shear nails at the edge of the slot is greater than the length of the shear nails at other positions in the slot.

[0013] In some embodiments, the arrangement density of the first reinforcing steel bars in the concrete area of ​​the bridge deck is greater than the arrangement density in the notch.

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

[0015] In some embodiments, along the axial direction of the notch, the inner diameter of the notch at one end close to the steel beam is larger than the inner diameter of the other end.

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

[0017] In a second aspect, a bridge is provided, comprising the above-mentioned steel-concrete composite beam connection structure.

[0018] The embodiment of the present application provides a steel-concrete composite beam connection structure, which is formed by arranging a first reinforcing steel bar in the bridge deck, the surface formed by which is consistent with the transverse direction of the bridge and perpendicular to the steel mesh, installing a second reinforcing steel bar in the slot after hoisting, and finally pouring the through slot with concrete to form a whole, so that the second reinforcing steel bar, the first reinforcing steel bar, the shear nails and the ordinary steel mesh together form a shear-resistant connector. These components work together to increase the stress on the bridge deck in the horizontal plane and the longitudinal direction, and improve the shear and bending bearing capacity of the steel-concrete connection part. By locally reinforcing the second reinforcing steel bar, the connection structure is strengthened from the inside of the structure, and its ability to resist various complex stress conditions is enhanced, so that the entire steel-concrete composite beam connection structure can better ensure the stability and safety of the structure when subjected to external forces such as vehicle driving and wind loads.

[0019] Compared with the related art in which only bolts of equal length are welded on the upper edge of the top plate of the steel beam and only horizontal longitudinal and transverse steel bars are arranged in the bridge deck, the construction method of the present application can not only better cope with the shear and bending deformations 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 bolts on the steel beam, thereby facilitating rapid construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] Figure 1 A schematic diagram of a cross-sectional structure of a steel-concrete composite beam connection structure provided in an embodiment of the present application;

[0022] Figure 2 This is a schematic diagram of the AA cross-sectional structure of the steel-concrete composite beam connection structure provided in an embodiment of the present application.

[0023] In the figure: 1. steel beam; 2. bridge deck; 3. notch; 4. shear nail; 5. first reinforcing steel bar; 51. first steel bar; 52. second steel bar; 53. connecting steel bar; 6. second reinforcing steel bar; 7. steel mesh; 71. longitudinal steel bar; 72. transverse steel bar. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, 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 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 making creative work are within the scope of protection of this application.

[0025] The embodiments of the present application provide a steel-concrete composite beam connection structure, which can solve the problems in the related art of welding bolts of equal length on the upper edge of the steel beam top plate, configuring horizontal longitudinal and transverse steel bars in the bridge deck, and having a small shear bearing capacity reserve.

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

[0027] The bridge deck 2 has a notch 3 extending through it in the thickness direction of the bridge deck 2. A steel mesh 7 and a first reinforcing steel bar 5 are embedded in the bridge deck 2. The plane formed by the first reinforcing steel bar 5 is consistent with the transverse direction of the bridge and is vertically connected to the steel mesh 7.

[0028] A steel beam 1 is arranged below the bridge deck 2, and a shear nail 4 is arranged on its upper end surface in a notch 3;

[0029] The second reinforcing steel bars 6 are arranged in the notch 3 and connected to the steel mesh 7 , and the plane formed by the second reinforcing steel bars 6 is parallel to the plane formed by the first reinforcing steel bars 5 .

[0030] The embodiment of the present application provides a steel-concrete composite beam connection structure, by arranging a first reinforcing steel bar 5 in the bridge deck 2, the surface formed by the first reinforcing steel bar 5 is consistent with the transverse direction of the bridge and perpendicular to the steel mesh 7, and the second reinforcing steel bar 6 is installed in the slot 3 after hoisting, and finally the through slot 3 is cast with concrete to form a whole, so that the second reinforcing steel bar 6, the first reinforcing steel bar 5, the shear nail 4 and the ordinary steel mesh 7 together form a shear-resistant connector. These components work together to increase the stress on the bridge deck in the horizontal plane and the longitudinal direction, and improve the shear and bending bearing capacity of the steel-concrete connection part. By locally reinforcing the second reinforcing steel bar 6, the connection structure is strengthened from the inside of the structure, and its ability to resist various complex stress conditions is enhanced, so that the entire steel-concrete composite beam connection structure can better ensure the stability and safety of the structure when subjected to external forces such as vehicle driving and wind loads.

[0031] Compared with the related art in which only bolts of equal length are welded on the upper edge of the top plate of the steel beam and only horizontal longitudinal and transverse steel bars are arranged in the bridge deck, the construction method of the present application can not only better cope with the shear and bending deformations 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 bolts on the steel beam, thereby facilitating rapid construction.

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

[0033] The first reinforcing steel bar 5 includes a first steel bar 51 and a second steel bar 52 arranged in the bridge deck 2. The first steel bar 51 and the second steel bar 52 have opening ends facing each other in the bridge deck 2. When installed, the opening direction is consistent with the transverse direction of the bridge. The first steel bar 51 and the second steel bar 52 are both 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 steel bar 51 and the second steel bar 52 is connected to a connecting steel bar 53. When installed, the connecting steel bar 53 is close to the steel beam 1. The U-shaped steel bar open end has upper and lower ends, both ends are fixed on the steel mesh 7, the first steel bar 51 and the second steel bar 52 are connected at the bottom, and the upper part does not extend into the slot 3, reducing the number of top steel bars in the slot 3, which is convenient for concrete pouring and vibration. The connecting steel bar 53 can improve the bending resistance of the bridge deck.

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

[0036] The length of the shear nails 4 at the edge of the notch 3 is greater than the length of the shear nails 4 at other positions in the notch 3. When the structure is subjected to load, the joints are usually subjected to greater stress concentration, including shear force, tension and bending moment, etc. The longer shear nails 4 can better connect the bridge deck 2 and the steel beam 1 together, and effectively transfer stress through their larger anchorage length and higher pull-out and shear resistance, avoiding problems such as debonding and slippage in the area, and ensuring the integrity and collaborative working performance of the structure.

[0037] like Figure 2 As shown, the arrangement density of the first reinforcing steel bars 5 in the concrete area of ​​the bridge deck 2 is greater than that in the notch 3. The concrete area of ​​the bridge deck 2 is the part that bears the main load, and a higher density of reinforcing steel bars is required to ensure its bearing capacity. By increasing the arrangement density of the first reinforcing steel bars 5 in this area, the overall strength and rigidity of the bridge deck 2 when bearing vehicle loads, deadweight and various environmental loads can be more effectively improved to prevent concrete cracking and deformation. A small amount of first reinforcing steel bars 5 are arranged in the notch 3 area to reduce the collision between the bridge deck 2 and the shear nails when hoisting, which is convenient for installation.

[0038] The second reinforcing steel bar 6 is installed after the bridge deck 2 is hoisted. After the bridge deck 2 is hoisted, the second reinforcing steel bar 6 is installed in the notch 3, and the through-type notch 3 is poured with concrete to form a whole. Through local reinforcement, the second reinforcing steel bar 6 forms a shear connector together with the first reinforcing steel bar 5, the shear nail 4 and the ordinary steel mesh 7 to jointly bear the internal force of the structure and improve the longitudinal force of the bridge deck 2.

[0039] Along the axial direction of the notch 3, the inner diameter of the notch 3 near one end of the steel beam 1 is larger than the inner diameter of the other end. The notch 3 is large at the bottom and small at the top, and is a trapezoidal structure or a truncated cone structure, which reduces the weakening of the overall cross-section of the prefabricated bridge deck 2, ensures that the thin-walled sections on both sides of the notch 3 are structurally safe during hoisting, and can also enhance the bonding strength between the notch concrete and the bridge deck 2, avoiding loosening between the notch concrete and the bridge deck 2 under the live load of the bridge deck.

[0040] The steel mesh 7 includes longitudinal steel bars 71 and transverse steel bars 72 which are arranged perpendicular to each other. The longitudinal steel bars 71 are arranged along the bridge direction and have a density greater than that of the transverse steel bars 72. The transverse steel bars 72 have a relatively low density, which reduces the collision between the bridge deck 2 and the shear nails 4 during hoisting. After hoisting, the second reinforcing steel bars 6 are used to partially reinforce the transverse direction of the bridge deck 2, which is convenient for installation and improves the overall shear and bending resistance of the structure, greatly improving the connection strength and bearing capacity of the steel-concrete joint.

[0041] The present application also provides a bridge made by using the above-mentioned steel-concrete composite beam connection structure.

[0042] In the process of prefabricating the bridge deck 2, the steel mesh 7 is first arranged, and then the first reinforcing steel bar 5 is arranged according to the optimized density, and the bridge deck 2 is prefabricated using high-quality concrete. According to the size of the notch 3 of the prefabricated bridge deck 2, the shear nails 4 are arranged on the steel beam, and the bridge deck 2 is hoisted onto the steel beam 1 so that the shear nails 4 are in the notch 3. After the hoisting is completed, the second reinforcing steel bar 6 is installed so that the second reinforcing steel bar 6 bypasses the steel mesh 7 in the notch 3 and is fixedly connected to the steel mesh 7, and then concrete is poured into the notch to complete the construction.

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

[0044] At the same time, since the first reinforcing steel bar 5 is connected to the steel mesh 7, the second reinforcing steel bar 6 is also connected to the steel mesh 7, so that the steel mesh 7, the first reinforcing steel bar 5, the second reinforcing steel bar 6, and the shear nail 4 form a shear connector. These components work together to increase the stress on the bridge deck 2 in the horizontal plane and in the longitudinal direction, and improve the shear and bending bearing capacity of the steel-concrete connection part.

[0045] 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.

[0046] 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.

[0047] The above description 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 steel-concrete composite beam connection structure, characterized in that: include: A bridge deck (2) having a notch (3) extending through the bridge deck (2) in a thickness direction, a steel mesh (7) and a first reinforcing steel bar (5) being pre-embedded in the bridge deck (2), wherein the plane formed by the first reinforcing steel bar (5) is consistent with the transverse direction of the bridge and is vertically connected to the steel mesh (7); A steel beam (1) is arranged below the bridge deck (2), and a shear nail (4) is arranged on its upper end surface in a notch (3); A second reinforcing steel bar (6) is arranged in the notch (3) and connected to the steel mesh (7), and a plane formed by the second reinforcing steel bar (6) is parallel to a plane formed by the first reinforcing steel bar (5).

2. The steel-concrete composite beam connection structure according to claim 1, characterized in that: The second reinforcing steel bar (6) is a closed ring steel bar.

3. The steel-concrete composite beam connection structure according to claim 1, characterized in that: The first reinforcing steel bar (5) comprises a first steel bar (51) and a second steel bar (52) arranged in the bridge deck (2); the first steel bar (51) and the second steel bar (52) have opening ends facing each other in the bridge deck (2); when installed, the opening direction is consistent with the transverse direction of the bridge.

4. The steel-concrete composite beam connection structure according to claim 3, characterized in that: One end of the open ends of the first steel bar (51) and the second steel bar (52) is connected to a connecting steel bar (53). During installation, the connecting steel bar (53) is close to the steel beam (1).

5. The steel-concrete composite beam connection structure according to claim 1, characterized in that: The length of the shear nails (4) at the edge of the notch (3) is greater than the length of the shear nails (4) at other positions in the notch (3).

6. The steel-concrete composite beam connection structure according to claim 1, characterized in that: The arrangement density of the first reinforcing steel bars (5) in the concrete area of ​​the bridge deck (2) is greater than the arrangement density in the notch (3).

7. The steel-concrete composite beam connection structure according to claim 1, characterized in that: The second reinforcing steel bars (6) are installed after the bridge deck (2) is hoisted.

8. The steel-concrete composite beam connection structure according to claim 1, characterized in that: Along the axial direction of the notch (3), the inner diameter of one end of the notch (3) close to the steel beam (1) is larger than the inner diameter of the other end.

9. The steel-concrete composite beam connection structure according to claim 1, characterized in that: The steel mesh (7) comprises longitudinal steel bars (71) and transverse steel bars (72) which are arranged perpendicular to each other. The longitudinal steel bars (71) are arranged along the bridge direction and have a density greater than that of the transverse steel bars (72).

10. A bridge, characterized in that: It comprises the steel-concrete composite beam connection structure as described in any one of claims 1 to 9.

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