Steel-concrete combined bridge
By setting up steel base plates and steel webs in steel-concrete composite bridges, combined with alternately setting of cross-spaces and lined concrete, the problem of insufficient strength of large-span bridges is solved, and the bridge strength and compression, bending and shear resistance are improved, extending the service life and reducing its self-weight.
Patent Information
- Application Number
- CN202421439872.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-21
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-06-21
AI Technical Summary
The existing steel-concrete composite structural bridges have low strength under large span conditions, making it difficult to meet the requirements for high span bridges.
A steel-concrete combination bridge is designed. By setting steel bottom plates and steel webs between concrete beam sections, instead of traditional concrete bottom plates, combining alternately setting solid web and truss-type separators, and setting lined concrete at different locations, the overall strength and compression, bending and shear resistance of the bridge are improved.
It significantly improves the strength and bearing capacity of the bridge, reduces its self-weight, extends the service life of the bridge structure, and avoids rigid sudden changes, ensuring the stability and safety of the bridge.
Smart Images
Figure CN222796180U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of bridges, in particular to a steel-concrete composite bridge. Background Art
[0002] Composite structural beams are beams made by combining two different materials or different processes, also known as combined beams. The cross-section type of traditional steel-concrete composite structural bridges is a combination of multiple pieces of channel steel or I-beams and a concrete bridge deck laid on the top. It mainly utilizes the advantages of concrete compression and steel box beam tension. It is cheaper than steel structure bridges, has better stress performance than concrete structures, and is more convenient to construct. However, based on the stress characteristics of the structure and the location of steel and concrete in the cross-section, it is more suitable for beam sections that are subject to positive bending moments. For beam sections with negative bending moments, it is necessary to consider the crack resistance of the bridge deck. The difficulty and cost of handling limit the application of composite beam bridges in continuous beam bridges.
[0003] Conventional steel-concrete composite beams are suitable for small and medium span bridges. In steel-concrete composite structure bridges, a combination of precast concrete bridge decks and steel beams is often used. In related technologies, the steel structure of the steel-concrete composite beam includes a steel top plate and steel side plates, and the bottom plate is a concrete plate; the concrete layer of the steel-concrete composite beam can be made of ordinary concrete or ultra-high performance concrete, and the concrete layer is laid on the steel top plate.
[0004] However, due to the growing demand for transportation, the span of bridges needs to be continuously increased. When thin panels are used, the strength is insufficient and they are easily damaged. The bridge deck is overloaded and moves too frequently. The use of thick layers of concrete will cause the bridge to be too heavy, making the steel structure of the steel-concrete composite beam prone to fatigue cracking. Utility Model Content
[0005] In order to solve the technical problem of low strength of large-span composite structural beams in the above-mentioned prior art, the utility model provides a steel-concrete composite bridge, which can improve the strength of the bridge and meet the use requirements of large spans.
[0006] The utility model adopts the following technical solution to solve the above technical problems: a steel-concrete composite bridge, comprising concrete beam sections at both ends, a plurality of steel-concrete beam sections are arranged between the two concrete beam sections, the steel-concrete beam sections include a steel structure, the steel structure includes a steel bottom plate, steel webs are vertically arranged at both ends of the steel bottom plate, concrete top plates are arranged on the upper parts of the two steel webs, and two adjacent steel bottom plates are welded and connected.
[0007] The utility model greatly improves the strength of the bridge by providing a steel bottom plate in the steel-concrete beam section between two concrete beam sections, replacing the concrete bottom plate used in the prior art. At the same time, there is no need to provide a thicker concrete bottom plate, which reduces the deadweight and extends the service life of the bridge structure.
[0008] Furthermore, a transverse partition is arranged in the cavity of the steel structure, and the transverse partitions of two adjacent steel structures are alternately solid web type transverse partitions and truss type transverse partitions.
[0009] The utility model further reduces the deadweight while ensuring the strength of the bridge by alternately arranging solid web type diaphragms and truss type diaphragms.
[0010] Furthermore, for the steel-concrete beam section near the concrete beam section, lining concrete is provided on the inner side of the steel web, for the multiple steel-concrete beam sections near the middle of the bridge, lining concrete is provided on the top of the steel bottom plate, and for the steel-concrete beam section located in the middle of the bridge, no lining concrete is provided inside the steel structure.
[0011] The utility model improves the bearing capacity and stability of the bridge by arranging inner lining concrete, improves its compression, bending and shear strength, and changes the arrangement position of the inner lining concrete according to the different positions of the steel-concrete beam sections to give full play to the reinforcing effect of the inner lining concrete.
[0012] Furthermore, the concrete beam section and the steel-concrete beam section are connected by a connecting piece, and the connecting piece includes an intermediate plate, the intermediate plate is U-shaped and opened upward, and the two sides of the intermediate plate are respectively a concrete connecting part and a steel structure connecting part, the concrete connecting part is connected to the concrete beam section, and the steel structure connecting part is connected to the steel structure.
[0013] The utility model realizes the connection between the concrete beam section and the adjacent steel-concrete beam section by arranging the connecting piece, which can improve the shear rigidity of the joint, avoid the rigidity mutation and make the rigidity transition appropriate.
[0014] Furthermore, the concrete connection portion includes a horizontally arranged connection plate 1, on which vertical shear nails are evenly arranged, and the vertical shear nails can be embedded in the bottom plate concrete of the concrete beam section.
[0015] Furthermore, a plurality of reinforcing ribs are arranged on the connecting plate 1, and the reinforcing ribs are in a V-shaped structure. The openings of the reinforcing ribs face the interior of the concrete beam section, and reinforcing rods are vertically arranged at the openings of the reinforcing ribs.
[0016] The utility model can enhance the connection strength and support strength between the connecting piece and the concrete beam section by arranging the reinforcing ribs, thereby ensuring high-strength connection between the concrete beam section and the adjacent steel-concrete beam section.
[0017] Furthermore, steel bars are passed through the plurality of reinforcing ribs, and both ends of the steel bars are respectively embedded in the vertical plates of the concrete beam section.
[0018] This new type of method uses penetrating steel bars and reinforcing ribs to better transfer the bending moment on the beam section to the bottom surface, thereby smoothly transitioning the high stress concentration of the structure to a low stress level.
[0019] Furthermore, the steel structure connection portion includes a second connection plate, which is welded to the steel bottom plate. A stiffening rib is vertically arranged on the second connection plate, and the stiffening rib is welded to the steel bottom plate.
[0020] Furthermore, horizontal shear nails are evenly arranged on both sides of the middle plate, and the horizontal shear nails can be embedded in the concrete of the concrete beam section and the steel-concrete beam section accordingly.
[0021] The utility model further enhances the connection strength between the concrete beam section and the adjacent steel-concrete beam section by arranging horizontal shear nails.
[0022] Furthermore, the steel web and the vertical plate are both made of corrugated steel.
[0023] It can be seen from the above technical solutions that the utility model has the following advantages:
[0024] The utility model provides a steel-concrete composite bridge, which greatly improves the strength of the bridge by arranging a steel bottom plate between two concrete beam sections to replace the concrete bottom plate used in the prior art, and at the same time does not need to be arranged with a thicker concrete bottom plate, thereby reducing the deadweight and extending the service life of the bridge structure; by alternately arranging solid web plate type diaphragms and truss type diaphragms, the deadweight is further reduced while ensuring the strength of the bridge; by arranging inner lining concrete, the bearing capacity and stability of the bridge are improved, and its compression, bending and shearing strengths are improved; and the arrangement position of the inner lining concrete is changed according to the different positions of the steel-concrete beam sections, so as to give full play to the advantages of the present invention. The reinforcing effect of the lining concrete is exerted; by setting the connector to connect the concrete beam section and the adjacent steel-concrete beam section, the shear stiffness of the joint can be improved, the rigidity mutation can be avoided, and the rigidity transition can be appropriate; by setting the reinforcing ribs, the connection strength and support strength between the connector and the concrete beam section can be enhanced, and the high-strength connection between the concrete beam section and the adjacent steel-concrete beam section can be ensured; by penetrating the steel bars and reinforcing ribs, the bending moment on the beam section can be better transferred to the bottom surface, thereby smoothly transitioning the high stress concentration of the structure to a low stress level; by setting the horizontal shear nails, the connection strength between the concrete beam section and the adjacent steel-concrete beam section can be further enhanced. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] In order to more clearly illustrate the technical solution of the utility model, the drawings required for use in the description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0026] Figure 1 It is a structural schematic diagram of a specific implementation method of the utility model.
[0027] Figure 2 The structure of the concrete beam section in the specific implementation mode of the utility model is shown in FIG. Figure 1 .
[0028] Figure 3 It is a schematic diagram of the assembly structure of the concrete beam section and the connecting piece in the specific implementation manner of the utility model.
[0029] Figure 4 It is a structural schematic diagram of a steel-concrete beam section of a solid web type transverse partition in a specific implementation manner of the utility model.
[0030] Figure 5 It is a structural schematic diagram of the steel-concrete beam section of the X-shaped truss-type transverse partition in a specific implementation manner of the utility model.
[0031] Figure 6 It is a structural schematic diagram of the steel-concrete beam section of the V-truss type cross-diaphragm in the specific implementation manner of the utility model.
[0032] In the figure, 1. vertical plate; 2. middle plate; 3. concrete plate; 4. reinforcing ribs; 5. concrete top plate; 6. solid web partition; 7. steel bottom plate; 8. steel web; 9. truss type partition; 10. concrete beam section; 11. steel-concrete beam section. DETAILED DESCRIPTION
[0033] In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, the technical scheme of the utility model will be clearly and completely described below in combination with the drawings in the specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the utility model, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.
[0034] like Figure 1 , Figure 2 , Figures 4 to 6As shown, this specific embodiment provides a steel-concrete composite bridge, including a concrete beam section 10 and a steel-concrete beam section 11, wherein the concrete beam section 10 is located at the end of the bridge, the concrete beam section 10 includes a concrete bottom plate, and vertical plates 1 are arranged at both ends of the concrete bottom plate. The vertical plates 1 use corrugated steel webs 8, and the upper ends of the two vertical plates 1 are connected by concrete plates 3. Multiple steel-concrete beam sections 11 are located between the two concrete beam sections 10, and the steel-concrete beam section 11 includes a steel structure, and the steel structure includes a steel bottom plate 7. Steel webs 8 are vertically arranged at both ends of the steel bottom plate 7. In this specific embodiment, the steel webs 8 are made of corrugated steel, and concrete top plates 5 are arranged on the upper parts of the two steel webs 8. Two adjacent steel bottom plates 7 are welded and connected.
[0035] This specific embodiment greatly improves the strength of the bridge by providing a steel bottom plate 7 on the steel-concrete beam section 11 between the two concrete beam sections 10, replacing the concrete bottom plate used in the prior art. At the same time, there is no need to provide a thicker concrete bottom plate, which reduces the dead weight and extends the service life of the bridge structure.
[0036] In the prior art, in order to improve the shear strength of the bridge, a transverse partition is arranged inside the cavity, such as Figures 4 to 6 As shown, in this specific embodiment, in order to further reduce the deadweight of the bridge, the cross diaphragms of two adjacent steel structures alternately use solid web type cross diaphragms 6 and truss type cross diaphragms 9. As the height of the steel structure changes, the truss structure and size continue to change. The truss close to the end concrete beam is an X-shaped structure, and the truss in the middle is a V-shaped structure.
[0037] In the prior art, lining concrete is provided in the beam cavity to enhance the bearing capacity and stability of the bridge and improve its compressive, bending and shear strengths. However, due to the different stress conditions of beam sections at different positions, the types of their weakest strengths are different. In order to give full play to the reinforcing effect of lining concrete, in this specific embodiment, the steel-concrete beam section 11 close to the concrete beam section 10 is provided with lining concrete on the inner side of the steel web 8 to enhance the shear strength of the beam section at this position; the multiple steel-concrete beam sections 11 close to the middle of the bridge are provided with lining concrete on the top of the steel bottom plate 7 to enhance the bending strength of the beam section here; the steel-concrete beam section 11 located in the middle of the bridge is not provided with lining concrete inside the steel structure to prevent the lining concrete from weakening the compressive and bending strengths of the steel structure of the middle beam section.
[0038] like Figure 2 and Figure 3As shown, due to the large difference in stiffness between the concrete beam section 10 and the steel-concrete beam section 11, in order to prevent stress concentration caused by sudden change in bridge stiffness, in this specific embodiment, the concrete beam section 10 and the steel-concrete beam section 11 are connected by a connector, and the connector includes an intermediate plate 2. The intermediate plate 2 is a U-shaped structure and opens upward. The two sides of the intermediate plate 2 are respectively a concrete connection part and a steel structure connection part. The concrete connection part is connected to the concrete beam section 10, and the steel structure connection part is connected to the steel structure. By setting a connector to connect the concrete beam section 10 and the adjacent steel-concrete beam section 11, the shear stiffness of the joint can be improved, the sudden change in stiffness can be avoided, and the stiffness transition can be appropriate.
[0039] like Figure 3 As shown, in order to ensure the connection strength between the connecting piece and the concrete beam section 10, the concrete connecting part includes a horizontally arranged connecting plate 1, and vertical shear nails are evenly arranged on the connecting plate 1, and the vertical shear nails can be buried in the bottom plate concrete of the concrete beam section 10; a plurality of reinforcing ribs 4 are also arranged on the connecting plate 1, and the reinforcing ribs 4 are of V-shaped structure, and the openings of the reinforcing ribs 4 face the inside of the concrete beam section 10, and reinforcing rods are vertically arranged at the openings of the reinforcing ribs 4; steel bars are passed through between the plurality of reinforcing ribs 4, and the two ends of the steel bars are respectively buried in the vertical plate 1 of the concrete beam section 10, and the bending moment on the beam section is better transmitted to the bottom surface by passing through the steel bars and the reinforcing ribs 4, thereby smoothly transitioning the high stress concentration of the structure to a low stress level.
[0040] In this specific embodiment, the steel structure connection portion includes a second connection plate, which is welded to the steel bottom plate 7 , and a stiffening rib is vertically arranged on the second connection plate, which is welded to the steel bottom plate 7 .
[0041] In order to further enhance the connection strength between the concrete beam section 10 and the adjacent steel-concrete beam section 11, in this specific embodiment, horizontal shear nails are evenly arranged on both sides of the middle plate 2, and the horizontal shear nails can be embedded in the concrete of the concrete beam section 10 and the steel-concrete beam section 11 accordingly.
[0042] The steel-concrete composite bridge in this article refers to the bridge structure between two piers. The piers are set at the lower part of the concrete beam section. The concrete beam section with a smaller height is the side span straight section, the concrete beam section with a larger height is the zero block, and the middle steel-concrete beam section is the standard section. From the zero block to the side span straight section, the height of the standard section gradually decreases.
[0043] From the above specific implementations, it can be seen that the utility model has the following beneficial effects:
[0044] 1. By providing a steel bottom plate 7 in the steel-concrete beam section 11 between the two concrete beam sections 10, instead of the concrete bottom plate used in the prior art, the strength of the bridge is greatly improved. At the same time, there is no need to provide a thicker concrete bottom plate, which reduces the deadweight and prolongs the service life of the bridge structure.
[0045] 2. By alternately arranging solid web type diaphragms 6 and truss type diaphragms 9, the deadweight of the bridge can be further reduced while ensuring its strength;
[0046] 3. By setting up lining concrete, the bearing capacity and stability of the bridge are improved, and its compression, bending and shear strength are improved. In addition, the setting position of the lining concrete is changed according to the different positions of the steel-concrete beam section 11, so as to give full play to the reinforcement effect of the lining concrete;
[0047] 4. The concrete beam section 10 and the adjacent steel-concrete beam section 11 are connected by providing a connector, which can improve the shear stiffness of the joint, avoid sudden change in stiffness, and make the stiffness transition appropriate;
[0048] 5. The reinforcement ribs 4 can enhance the connection strength and support strength between the connector and the concrete beam section 10, thereby ensuring a high-strength connection between the concrete beam section 10 and the adjacent steel-concrete beam section 11;
[0049] 6. By penetrating the steel bars and reinforcing ribs 4, the bending moment on the beam section is better transferred to the bottom surface, thereby smoothly transitioning the high stress concentration of the structure to a low stress level;
[0050] 7. The connection strength between the concrete beam section 10 and the adjacent steel-concrete beam section 11 is further enhanced by arranging horizontal shear nails.
[0051] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be 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 the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A steel-concrete composite bridge, comprising concrete beam sections (10) at both ends, the concrete beam sections (10) comprising a concrete bottom plate, and vertical plates (1) are vertically arranged on both sides of the concrete bottom plate, characterized in that: A plurality of steel-concrete beam sections (11) are arranged between two concrete beam sections (10), the steel-concrete beam sections (11) include a steel structure, the steel structure includes a steel bottom plate (7), steel webs (8) are vertically arranged at both ends of the steel bottom plate (7), a concrete top plate (5) is arranged on the upper part of the two steel webs (8), and two adjacent steel bottom plates (7) are welded and connected.
2. The steel-concrete composite bridge according to claim 1, characterized in that: A transverse partition is arranged in the steel structure cavity, and the transverse partitions of two adjacent steel structures are alternately solid web type transverse partitions (6) and truss type transverse partitions (9).
3. The steel-concrete composite bridge according to claim 2, characterized in that: The steel-concrete beam section (11) close to the concrete beam section (10) has lining concrete arranged on the inner side of the steel web (8), the multiple steel-concrete beam sections (11) close to the middle of the bridge have lining concrete arranged on the top of the steel bottom plate (7), and the steel-concrete beam section (11) located in the middle of the bridge has no lining concrete arranged inside the steel structure.
4. The steel-concrete composite bridge according to any one of claims 1 to 3, characterized in that: The concrete beam section (10) and the steel-concrete beam section (11) are connected via a connecting piece, wherein the connecting piece comprises an intermediate plate (2), the intermediate plate (2) is in a U-shaped structure and is open upwards, and the two sides of the intermediate plate (2) are respectively a concrete connecting part and a steel structure connecting part, the concrete connecting part is connected to the concrete beam section (10), and the steel structure connecting part is connected to the steel structure.
5. The steel-concrete composite bridge according to claim 4, characterized in that: The concrete connection part comprises a horizontally arranged connection plate 1, on which vertical shear nails are evenly arranged, and the vertical shear nails can be embedded in the bottom plate concrete of the concrete beam section (10).
6. The steel-concrete composite bridge according to claim 5, characterized in that: A plurality of reinforcing ribs (4) are also arranged on the first connecting plate. The reinforcing ribs (4) are in a V-shaped structure. The openings of the reinforcing ribs (4) face the inside of the concrete beam section (10). Reinforcing rods are vertically arranged at the openings of the reinforcing ribs (4).
7. The steel-concrete composite bridge according to claim 6, characterized in that Steel bars are inserted between the plurality of reinforcing ribs (4), and both ends of the steel bars are respectively embedded in the vertical plates (1) of the concrete beam sections (10).
8. The steel-concrete composite bridge according to claim 4, characterized in that: The steel structure connection part comprises a second connection plate, which is welded to a steel bottom plate (7), and a stiffening rib is vertically arranged on the second connection plate, which is welded to the steel bottom plate (7).
9. The steel-concrete composite bridge according to claim 8, characterized in that: Horizontal shear nails are evenly arranged on both sides of the middle plate (2), and the horizontal shear nails can be correspondingly embedded in the concrete of the concrete beam section (10) and the steel-concrete beam section (11).
10. The steel-concrete composite bridge according to claim 1, characterized in that: The steel web (8) and the vertical plate (1) are both made of corrugated steel.