A transverse bridge large stiffness long cantilever flange bridge structure

Abstract

The utility model relates to a kind of transverse bridge direction big rigidity long cantilever flange bridge structures, including girder, big rigidity long cantilever flange, support, the girder is steel beam or steel-concrete composite beam, the big rigidity long cantilever flange is composed of cantilever beam and bridge deck slab, the cantilever beam is I-shaped section, and including cantilever beam upper flange, cantilever beam web and cantilever beam lower flange, the cantilever beam lower flange is closed section. The transverse bridge direction big rigidity long cantilever flange bridge structure is reasonable in stress, high in strength, the partial instability resistance of the girder is improved by the form of cantilever arm cross section, the rigidity of the section of the root of big rigidity long cantilever flange is improved, the tensile stress of the concrete bridge deck slab or bridge surface pavement of big rigidity long cantilever flange is reduced, and the tolerance of structure is improved.

Description

Technical Field

[0001] This utility model relates to a transversely rigid long cantilever flange bridge structure, and belongs to the field of civil engineering technology. Background Technology

[0002] With the rapid development of urban transportation, urban expressway networks are becoming increasingly sophisticated. Due to the constraints of median strips on ground-level auxiliary roads, and the need to consider aesthetic factors, the standard cross-section of overpasses typically adopts a long cantilever flange bridge structure. This allows for a larger space beneath the overpass for accommodating traffic lanes. This type of bridge superstructure is characterized by small bearing spacing and significant lateral stress. For prestressed concrete beam bridges, cracks and damage can occur during operation due to the properties of the concrete itself, loads, and the environment. For the long cantilever flange structure of steel-concrete composite beam or steel box girder bridges, the bridge deck is under tension. Furthermore, the stiffness of the tensioned cantilever portion generates significant tensile stress in the bridge deck, often leading to cracking. Utility Model Content

[0003] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a transverse bridge structure with high stiffness and long cantilever flange.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: a transverse high-stiffness long cantilever flange bridge structure, including a main beam, a high-stiffness long cantilever flange, and supports. The main beam is a steel beam or a steel-concrete composite beam. The high-stiffness long cantilever flange is composed of a cantilever beam and a bridge deck. The cantilever beam has an I-shaped cross section and includes an upper flange, a web, and a lower flange. The lower flange of the cantilever beam has a closed cross section.

[0005] Preferably, the lower flange of the cantilever beam adopts a steel pipe structure, which is a square steel pipe, a rectangular steel pipe, a circular steel pipe, or an elliptical steel pipe.

[0006] Preferably, the lower flange of the cantilever beam adopts a channel-shaped flange structure. The channel-shaped flange structure is formed by welding or cold bending three steel plates. The lower end of the web of the cantilever beam is welded to the channel-shaped flange structure. The upper end of the channel-shaped flange structure is connected to the top of the steel plates on both sides of the channel-shaped flange structure and the web of the cantilever beam by a thin steel plate, forming a slope that is higher near the web of the cantilever beam and lower near both sides of the channel-shaped flange structure, so that the channel-shaped flange structure forms a closed space.

[0007] Preferably, the root of the cantilever arm of the lower flange of the cantilever beam is connected to the main beam, the lower flange of the cantilever beam is welded to the web of the cantilever beam, and the other side of the web of the cantilever beam is welded to the stiffening structure corresponding to the lower flange of the cantilever beam, so that the force transmission of the lower flange of the cantilever beam is continuous and the instability of the welded joint of the cantilever beam is prevented.

[0008] Preferably, the main beam is a box-shaped structure, and a transverse diaphragm is provided inside the box-shaped structure. The transverse diaphragm is positioned corresponding to the cantilever beam, and stiffening ribs are provided at the corresponding positions of the lower flange of the transverse diaphragm and cantilever beam to transmit force.

[0009] Preferably, the number of main beams is greater than one, and a steel crossbeam is provided between adjacent main beams. The steel crossbeam has an I-shaped cross section, and the lower flange of the I-shaped cross section of the steel crossbeam is a closed cross section, and the closed cross section is the same as the lower flange cross section of the cantilever beam.

[0010] Preferably, the closed section of the lower flange of the cantilever beam is filled with ordinary concrete.

[0011] Preferably, the high-rigidity long cantilever flange is provided with prefabricated crash barriers on both sides of the bridge deck, and the prefabricated crash barriers are fixed to the cantilever beam by fasteners, the fasteners being high-strength bolt connections.

[0012] Preferably, the cantilever beam has a variable cross-section, that is, the cross-section of the cantilever beam at the connection end with the main beam is large and the cross-section at the far end is small, and the cross-section of the cantilever beam is I-shaped or box-shaped.

[0013] Preferably, the ends of the cantilever beam are connected by side longitudinal beams, which have a box-shaped cross-section, and the cantilever beam ends are welded to the side longitudinal beams.

[0014] Compared with the prior art, the present invention has the following beneficial effects: the transverse high stiffness long cantilever flange bridge structure has reasonable stress distribution and high strength. The cantilever cross section improves the main beam's resistance to local instability, increases the stiffness of the root section of the high stiffness long cantilever flange, reduces the tensile stress of the concrete bridge deck or bridge deck pavement of the high stiffness long cantilever flange, and improves the structure's durability.

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present utility model.

[0017] Figure 2 This is a schematic diagram of the cross-section of the cantilever beam with a steel pipe structure on the lower flange of the cantilever beam according to Embodiment 1 of this utility model.

[0018] Figure 3 This is a schematic diagram of the cross-section of the cantilever beam with a grooved flange structure in Embodiment 2 of this utility model.

[0019] Figure 4 This is a structural schematic diagram of Embodiment 2 of the present invention.

[0020] Figure 5 This is a structural schematic diagram of Embodiment 3 of the present invention. Figure 1 .

[0021] Figure 6 This is a structural schematic diagram of Embodiment 3 of the present invention. Figure 2 .

[0022] In the diagram: 1-1 steel beam, 1-2 steel-concrete composite beam, 2-high stiffness long cantilever flange, 3-support, 4-cantilever beam, 5-bridge deck, 6-cantilever upper flange, 7-cantilever web, 8-cantilever lower flange, 9-cantilever root, 10-steel crossbeam, 11-precast crash barrier, 12-side longitudinal beam. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0025] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0026] like Figures 1-2 As shown, this embodiment provides a transverse high-stiffness long cantilever flange bridge structure, including a main beam, a high-stiffness long cantilever flange, and supports. The high-stiffness long cantilever flange is composed of a cantilever beam and a bridge deck. The cantilever beam has an I-shaped cross section and includes an upper flange, a web, and a lower flange. The lower flange of the cantilever beam has a closed cross section.

[0027] In the first embodiment of this utility model, the root of the cantilever arm of the lower flange of the cantilever beam is connected to the main beam, the lower flange of the cantilever beam is welded to the web of the cantilever beam, and the other side of the web of the cantilever beam is welded to the stiffening structure corresponding to the lower flange of the cantilever beam, so that the force transmission of the lower flange of the cantilever beam is continuous and the instability of the welded part of the cantilever beam is prevented.

[0028] In the first embodiment of this utility model, the main beam is a box-shaped structure, and a transverse diaphragm is provided inside the box-shaped structure. The transverse diaphragm is positioned corresponding to the cantilever beam, and stiffening ribs are provided at the corresponding positions of the lower flange of the transverse diaphragm and cantilever beam to transmit force.

[0029] In the first embodiment of this utility model, the number of main beams is greater than one, and a steel crossbeam is provided between adjacent main beams. The steel crossbeam has an I-shaped cross section, and the lower flange of the I-shaped cross section of the steel crossbeam is a closed cross section, which is the same as the lower flange cross section of the cantilever beam.

[0030] In the first embodiment of this utility model, the closed section of the lower flange of the cantilever beam is filled with ordinary concrete.

[0031] In the first embodiment of this utility model, the high-rigidity long cantilever flange is provided with prefabricated anti-collision walls on both sides of the bridge deck. The prefabricated anti-collision walls are fixed to the cantilever beam by fasteners, which are high-strength bolt connections.

[0032] In the first embodiment of this utility model, the cantilever beam adopts a variable cross-section, that is, the cross-section of the cantilever beam at the connection end with the main beam is large and the cross-section at the far end is small. The cross-section of the cantilever beam is I-shaped or box-shaped.

[0033] In the first embodiment of this utility model, the end of the cantilever beam is connected by a side longitudinal beam, which has a box-shaped cross section, and the end of the cantilever beam is welded to the side longitudinal beam.

[0034] In the first embodiment of this utility model, the main beam is a steel-concrete composite beam.

[0035] In the first embodiment of this utility model, the lower flange of the cantilever beam adopts a steel pipe structure, which can be a square steel pipe, a rectangular steel pipe, a circular steel pipe, or an elliptical steel pipe.

[0036] In the second embodiment of this utility model, as Figures 3-4 As shown, the main difference between Embodiment 2 and Embodiment 1 is that the lower flange of the cantilever beam adopts a channel-shaped flange structure. The channel-shaped flange structure shown is formed by welding or cold bending three steel plates. The lower end of the web of the cantilever beam is welded to the channel-shaped flange structure. The upper end of the channel-shaped flange structure is connected to the top of the steel plates on both sides of the channel-shaped flange structure and the web of the cantilever beam by a thin steel plate, forming a slope that is higher near the web of the cantilever beam and lower near both sides of the channel-shaped flange structure, so that the channel-shaped flange structure forms a closed space.

[0037] In the third embodiment of this utility model, as Figures 5-6 As shown, the main difference between Embodiment 3 and Embodiments 1 and 2 is that the main beam is a steel beam, and Figure 5 The lower flange of the cantilever beam adopts a steel pipe structure. Figure 6 The lower flange of the cantilever beam adopts a grooved flange structure.

[0038] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A transversely stiff long cantilever flange bridge structure, characterized in that: It includes a main beam, a high-stiffness long cantilever flange, and supports. The main beam is a steel beam or a steel-concrete composite beam. The high-stiffness long cantilever flange is composed of a cantilever beam and a bridge deck. The cantilever beam has an I-shaped cross-section and includes an upper flange, a web, and a lower flange. The lower flange of the cantilever beam has a closed cross-section.

2. The transversely stiff long cantilever flange bridge structure according to claim 1, characterized in that: The lower flange of the cantilever beam adopts a steel pipe structure, which can be a square steel pipe, a rectangular steel pipe, a circular steel pipe, or an elliptical steel pipe.

3. The transversely stiff long cantilever flange bridge structure according to claim 1, characterized in that: The lower flange of the cantilever beam adopts a channel-shaped flange structure. The channel-shaped flange structure shown is formed by welding or cold bending three steel plates. The lower end of the web of the cantilever beam is welded to the channel-shaped flange structure. The upper end of the channel-shaped flange structure is connected to the top of the steel plates on both sides of the channel-shaped flange structure and the web of the cantilever beam by a thin steel plate, forming a slope that is higher near the web of the cantilever beam and lower near the sides of the channel-shaped flange structure, so that the channel-shaped flange structure forms a closed space.

4. The transverse high-stiffness long cantilever flange bridge structure according to claim 2 or 3, characterized in that: The cantilever root of the lower flange of the cantilever beam is connected to the main beam. The lower flange of the cantilever beam is welded to the web of the cantilever beam. The other side of the web of the cantilever beam is welded to the stiffening structure corresponding to the lower flange of the cantilever beam, so that the force transmission of the lower flange of the cantilever beam is continuous and the instability of the welded part of the cantilever beam is prevented.

5. The transversely stiff long cantilever flange bridge structure according to claim 4, characterized in that: The main beam is a box-shaped structure, and a transverse diaphragm is provided inside the box-shaped structure. The transverse diaphragm is positioned corresponding to the cantilever beam, and stiffening ribs are provided at the corresponding positions of the lower flange of the transverse diaphragm and the cantilever beam to transmit force.

6. The transversely stiff long cantilever flange bridge structure according to claim 1, characterized in that: The number of main beams is greater than one, and steel crossbeams are set between adjacent main beams. The steel crossbeams have an I-shaped cross section, and the lower flange of the I-shaped cross section of the steel crossbeams is a closed cross section, which is the same as the lower flange cross section of the cantilever beam.

7. The transversely stiff long cantilever flange bridge structure according to claim 1, characterized in that: The closed section of the lower flange of the cantilever beam is filled with ordinary concrete.

8. The transversely stiff long cantilever flange bridge structure according to claim 1, characterized in that: The high-rigidity long cantilever flange is provided with prefabricated crash barriers on both sides of the bridge deck. The prefabricated crash barriers are fixed to the cantilever beam by fasteners, which are high-strength bolts.

9. The transversely stiff long cantilever flange bridge structure according to claim 1, characterized in that: The cantilever beam has a variable cross-section, meaning that the cross-section is larger at the connection end with the main beam and smaller at the far end. The cross-section of the cantilever beam is I-shaped or box-shaped.

10. The transversely stiff long cantilever flange bridge structure according to claim 1, characterized in that: The cantilever beam shown is connected to the side longitudinal beam by a box-shaped cross section, and the cantilever beam end is welded to the side longitudinal beam.

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