Double-I-steel composite beam and steel-concrete composite bridge

Abstract

The utility model provides a double-I-steel composite beam and a steel-concrete composite bridge, a first web is vertically connected with a first top plate and a first upper bottom plate, a first lower bottom plate is positioned below the first upper bottom plate, and the first lower bottom plate is fixedly connected with the first upper bottom plate; the steel cross beam is perpendicular to the two side main beams, the second web is perpendicularly connected with the second top plate and the second bottom plate, one end of the second top plate of the steel cross beam is welded to the first top plate of one side main beam, and the other end of the second top plate of the steel cross beam is welded to the first top plate of the other side main beam. One end of the second bottom plate of the steel cross beam is welded with the first upper bottom plate of one side main beam, the other end of the second bottom plate of the steel cross beam is welded with the first upper bottom plate of the other side main beam, and the thickness of the second bottom plate is equal to that of the first upper bottom plate. According to the utility model, the problems of reduced design stress caused by the thickness of the bottom plate of the side main beam of the double-I-steel composite beam, high difficulty in welding operation with the bottom plate of the steel cross beam and poor quality can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge design and construction, in particular to a double I-beam combined beam and a steel-concrete composite bridge. Background Art

[0002] Steel-concrete composite beams take advantage of the advantages of both steel and concrete materials. In particular, double I-beam composite beams have many advantages such as light weight, strong bearing capacity, and clear force. They can also flexibly adapt to various construction processes such as bridge deck prefabrication, steel beam cantilever assembly, and bracket construction. They have been widely used in large-span bridge structures.

[0003] In actual application, the double I-beam composite beam section has the above advantages, but also has the following limitations:

[0004] 1. The bottom plate of the double I-beam side main beam is usually thicker, especially for large-span cable-stayed bridges. The maximum bottom plate thickness is usually 60 to 100 mm. The on-site welding process of thick plates is high, the welding cycle is long, and the welding quality is difficult to guarantee. In addition, as the thickness of the plate increases, the design stress limit of the plate also decreases, and the material performance cannot be fully utilized.

[0005] 2. The thickness of the bottom plate of the double I-beam side main beam is often much greater than the thickness of the bottom plate of the steel crossbeam. Due to the large difference in plate thickness between the two, direct welding is difficult, the welding quality is difficult to ensure, and stress concentration is obvious at the welding point where the plate thickness changes suddenly.

[0006] In response to the above problems, the current solutions are to use bolting as the connection between super-thick plates and plates with large differences in thickness. However, when crossing railways and other important transportation channels, bolting is not feasible because it is difficult to avoid the possibility of bolts loosening and falling during subsequent operations.

[0007] Therefore, it is necessary to develop a new double I-beam composite beam and steel-concrete composite bridge to improve the design stress reduction caused by the bottom plate thickness of the side main beam of the double I-beam composite beam and the difficulty and poor quality of the bottom plate welding operation with the steel cross beam. Utility Model Content

[0008] The utility model aims to provide a double I-beam combined beam and a steel-concrete composite bridge to solve the problems of reduced design stress caused by the bottom plate thickness of the side main beam of the existing double I-beam combined beam and difficult welding operation and poor quality with the bottom plate of the steel cross beam.

[0009] In order to solve the above technical problems, the utility model provides a double I-beam combined beam, comprising: two side main beams, comprising a first top plate, a first upper bottom plate, a first lower bottom plate and a first web plate, the first web plate vertically connecting the first top plate and the first upper bottom plate, the first lower bottom plate is located below the first upper bottom plate, and the first lower bottom plate and the first upper bottom plate are fixedly connected; and a steel cross beam, perpendicular to the two side main beams, the steel cross beam comprising a second top plate, a second bottom plate and a second web plate, the second web plate vertically connecting the second top plate and the second bottom plate, and one end of the second top plate of the steel cross beam is welded to the first top plate of one of the side main beams, the other end of the second top plate of the steel cross beam is welded to the first top plate of the other side main beam, one end of the second bottom plate of the steel cross beam is welded to the first upper bottom plate of one of the side main beams, the other end of the second bottom plate of the steel cross beam is welded to the first upper bottom plate of the other side main beam, and the thickness of the second bottom plate is equal to the thickness of the first upper bottom plate.

[0010] Optionally, the first top plate and the second top plate have the same thickness.

[0011] Optionally, the side main beam also includes a first vertical rib and a second vertical rib, the first vertical rib and the second vertical rib are respectively vertically connected to the first web, and the first vertical rib is respectively connected to the first top plate and the first upper bottom plate, the second vertical rib is respectively connected to the first top plate and the first upper bottom plate, the first vertical rib and the second vertical rib are respectively located on both sides of the first web, one end of the second web is welded to the first vertical rib of one of the side main beams, and the other end of the second web is welded to the second vertical rib of another side main beam.

[0012] Optionally, the thickness of the second web is the same as the thickness of the first vertical rib and the second vertical rib.

[0013] Optionally, the side main beam further includes a first longitudinal stiffening rib, wherein the first longitudinal stiffening rib is perpendicular to the first web plate and parallel to the first top plate, and the first longitudinal stiffening rib is located on a side of the side main beam away from the steel cross beam.

[0014] Optionally, there are multiple first longitudinal stiffening ribs, and the multiple first longitudinal stiffening ribs are arranged in sequence from top to bottom.

[0015] Optionally, the steel beam further includes a third vertical rib plate, wherein the third vertical rib plate is vertically connected to the second web plate, and the third vertical rib plate is respectively connected to the second top plate and the second bottom plate.

[0016] Optionally, there are multiple third vertical ribs, and the plurality of third vertical ribs are arranged in sequence along the longitudinal direction of the steel beam.

[0017] Optionally, the steel beam further includes a second longitudinal stiffening rib, wherein the second longitudinal stiffening rib is perpendicular to the second web plate and parallel to the second top plate.

[0018] The utility model also provides a steel-concrete composite bridge, comprising a concrete bridge deck and the above-mentioned double I-beam combined beam, wherein the concrete bridge deck is arranged on the double I-beam combined beam.

[0019] The utility model provides a double I-beam combined beam and a steel-concrete composite bridge, which has the following beneficial effects:

[0020] Since the first web plate vertically connects the first top plate and the first upper bottom plate, the first top plate, the first upper bottom plate and the first web plate form an I-beam; since the second web plate vertically connects the second top plate and the second bottom plate, the second top plate, the second bottom plate and the second web plate form an I-beam; since the first lower bottom plate is located below the first upper bottom plate, and the first lower bottom plate and the first upper bottom plate are fixedly connected, the bottom plate of the I-beam of the side main beam is composed of the first upper bottom plate and the first lower bottom plate. In this way, compared with a single bottom plate whose thickness is equal to the sum of the thicknesses of the first upper bottom plate and the first lower bottom plate, the design stress of the plate can be ensured to be sufficient. The performance of the materials can be fully utilized; since one end of the second top plate of the steel cross beam is welded to the first top plate of one of the side main beams, the other end of the second top plate of the steel cross beam is welded to the first top plate of another side main beam, one end of the second bottom plate of the steel cross beam is welded to the first upper bottom plate of one of the side main beams, the other end of the second bottom plate of the steel cross beam is welded to the first upper bottom plate of another side main beam, and the thickness of the second bottom plate is equal to the thickness of the first upper bottom plate, therefore, the welding thickness of the bottom plate of the I-beam in the welded part of the side main beam and the steel cross beam can be equal, thus reducing the difficulty of welding operation, ensuring welding quality, and avoiding the problem of obvious stress concentration at the welding point where the plate thickness suddenly changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional view of a double I-beam combined beam in an embodiment of the utility model;

[0022] Figure 2 It is a vertical view of the connection between the side main beam and the steel cross beam of the double I-beam combined beam in the embodiment of the utility model;

[0023] Figure 3 It is a top plan view of a double I-beam combined beam in an embodiment of the utility model;

[0024] Figure 4 It is a bottom plan view of a double I-beam combined beam in an embodiment of the utility model.

[0025] Description of reference numerals:

[0026] 100-side main beam; 110-first top plate; 120-first upper bottom plate; 130-first lower bottom plate; 140-first web plate; 150-first vertical rib plate; 160-second vertical rib plate; 170-first longitudinal stiffening rib;

[0027] 200-steel cross beam; 210-second top plate; 220-second bottom plate; 230-second web plate; 240-third vertical rib plate; 250-second longitudinal stiffening rib;

[0028] 300-concrete bridge deck;

[0029] 410 - first weld; 420 - second weld; 430 - third weld. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Generally, the components of the embodiment of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply 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 utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0034] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0035] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 , Figure 1 It is a cross-sectional view of a double I-beam combined beam in an embodiment of the utility model. Figure 2 This is a vertical view of the connection between the side main beam 100 and the steel cross beam 200 of the double I-beam combined beam in the embodiment of the utility model. Figure 3 It is a top plan view of a double I-beam combined beam in an embodiment of the utility model. Figure 4 The bottom plane diagram of the double I-beam combined beam in the embodiment of the utility model is provided in the embodiment of the utility model. The double I-beam combined beam is provided in the embodiment of the utility model, including:

[0037] Two side main beams 100, including a first top plate 110, a first upper bottom plate 120, a first lower bottom plate 130 and a first web plate 140, wherein the first web plate 140 vertically connects the first top plate 110 and the first upper bottom plate 120, the first lower bottom plate 130 is located below the first upper bottom plate 120, and the first lower bottom plate 130 and the first upper bottom plate 120 are fixedly connected; and,

[0038] The steel cross beam 200 is perpendicular to the two side main beams 100, and includes a second top plate 210, a second bottom plate 220 and a second web 230. The second web 230 vertically connects the second top plate 210 and the second bottom plate 220, and one end of the second top plate 210 of the steel cross beam 200 is welded to the first top plate 110 of one side main beam 100, and the other end of the second top plate 210 of the steel cross beam 200 is welded to the first top plate 110 of the other side main beam 100, one end of the second bottom plate 220 of the steel cross beam 200 is welded to the first upper bottom plate 120 of one side main beam 100, and the other end of the second bottom plate 220 of the steel cross beam 200 is welded to the first upper bottom plate 120 of the other side main beam 100, and the thickness of the second bottom plate 220 is equal to the thickness of the first upper bottom plate 120.

[0039] Since the first web 140 vertically connects the first top plate 110 and the first upper bottom plate 120, the first top plate 110, the first upper bottom plate 120 and the first web 140 form an I-beam; since the second web 230 vertically connects the second top plate 210 and the second bottom plate 220, the second top plate 210, the second bottom plate 220 and the second web 230 form an I-beam; since the first lower bottom plate 130 is located below the first upper bottom plate 120, and the first lower bottom plate 130 and the first upper bottom plate 120 are fixedly connected, the bottom plate of the I-beam of the side main beam 100 is composed of the first upper bottom plate 120 and the first lower bottom plate 130. In this way, compared with a single bottom plate whose thickness is equal to the sum of the thicknesses of the first upper bottom plate 120 and the first lower bottom plate 130, the design of the plate can be ensured. The performance of the material is fully utilized; since one end of the second top plate 210 of the steel cross beam 200 is welded to the first top plate 110 of one of the side main beams 100, the other end of the second top plate 210 of the steel cross beam 200 is welded to the first top plate 110 of another side main beam 100, one end of the second bottom plate 220 of the steel cross beam 200 is welded to the first upper bottom plate 120 of one of the side main beams 100, the other end of the second bottom plate 220 of the steel cross beam 200 is welded to the first upper bottom plate 120 of another side main beam 100, and the thickness of the second bottom plate 220 is equal to the thickness of the first upper bottom plate 120, therefore, the welding thickness of the bottom plate of the I-beam in the welded part of the side main beam 100 and the steel cross beam 200 can be equal, so that the difficulty of welding operation can be reduced, the welding quality can be guaranteed, and at the same time, the problem of obvious stress concentration at the welding point where the plate thickness suddenly changes can be avoided.

[0040] Preferably, the thickness of the first top plate 110 and the second top plate 210 are the same, so that the welding quality of the side main beam 100 and the steel cross beam 200 can be further improved and the difficulty of welding operation can be reduced.

[0041] Furthermore, the side main beam 100 also includes a first vertical rib 150 and a second vertical rib 160, the first vertical rib 150 and the second vertical rib 160 are respectively vertically connected to the first web 140, and the first vertical rib 150 is respectively connected to the first top plate 110 and the first upper bottom plate 120, the second vertical rib 160 is respectively connected to the first top plate 110 and the first upper bottom plate 120, the first vertical rib 150 and the second vertical rib 160 are respectively located on both sides of the first web 140, one end of the second web 230 is welded to the first vertical rib 150 of one of the side main beams 100, and the other end of the second web 230 is welded to the second vertical rib 160 of another side main beam 100, so that the connection quality between the side main beam 100 and the steel cross beam 200 can be further improved, and the first vertical rib 150 and the second vertical rib 160 can strengthen the side main beam 100.

[0042] Preferably, the thickness of the second web 230 is the same as the thickness of the first vertical rib 150 and the second vertical rib 160. In this way, the welding quality of the side main beam 100 and the steel cross beam 200 can be further improved and the difficulty of the welding operation can be reduced.

[0043] Preferably, the side main beam 100 also includes a first longitudinal stiffening rib 170 , which is perpendicular to the first web 140 and parallel to the first top plate 110 , and the first longitudinal stiffening rib 170 is located on a side of the side main beam 100 away from the steel cross beam 200 .

[0044] Furthermore, the number of the first longitudinal stiffening ribs 170 may be multiple, and the multiple first longitudinal stiffening ribs 170 are arranged in sequence from top to bottom.

[0045] Preferably, the steel beam 200 further includes a third vertical rib 240 , wherein the third vertical rib 240 is vertically connected to the second web 230 , and the third vertical rib 240 is respectively connected to the second top plate 210 and the second bottom plate 220 .

[0046] Furthermore, there are multiple third vertical ribs 240 , and the plurality of third vertical ribs 240 are sequentially arranged along the longitudinal direction of the steel beam 200 .

[0047] Preferably, the steel beam 200 further includes a second longitudinal stiffening rib 250 , wherein the second longitudinal stiffening rib 250 is perpendicular to the second web plate 230 and parallel to the second top plate 210 .

[0048] This embodiment further provides a steel-concrete composite bridge, comprising a concrete bridge deck 300 and the double I-beam combined beam in the above embodiment, wherein the concrete bridge deck 300 is arranged on the double I-beam combined beam.

[0049] In this embodiment, the assembly process of the steel-concrete composite bridge is as follows:

[0050] In the first step, a concrete bridge deck 300 is precast at a precast plant site and stored for days to reduce the adverse effects of shrinkage and creep on the structure.

[0051] In the second step, the first top plate 110, the first upper bottom plate 120, the first lower bottom plate 130, the first web 140, the first vertical rib 150, the second vertical rib 160 and the first longitudinal stiffening rib 170 are welded in the factory to form a side main beam 100 segment, wherein the first upper bottom plate 120 and the first lower bottom plate 130 of the side main beam 100 are connected by four-sided welding, the plate thickness of the first top plate 110 is consistent with the plate thickness of the second top plate 210 of the steel cross beam 200, and the plate thickness of the first upper bottom plate 120 is consistent with the plate thickness of the second bottom plate 220 of the steel cross beam 200.

[0052] In the third step, the second top plate 210 , the second bottom plate 220 , the second web plate 230 , the third vertical rib plate 240 and the second longitudinal stiffening rib 250 are welded in the factory to form the steel cross beam 200 .

[0053] The fourth step is to transport the side main beam 100 segments and the steel cross beam 200 to the site, first assemble the side main beams 100 on both sides, and then hoist the steel cross beams 200 of the corresponding segments, the first top plate 110 of the side main beam 100 and the second top plate 210 of the steel cross beam 200 are welded to form a first weld 410, the first upper bottom plate 120 of the side main beam 100 and the second bottom plate 220 of the steel cross beam 200 are welded to form a second weld 420, one end of the second web 230 is welded to the first vertical rib 150 of one of the side main beams 100 to form a third weld 430, the other end of the second web 230 is welded to the second vertical rib 160 of another side main beam 100 to form a fourth weld, and the side main beams 100 on both sides are connected with the steel cross beam 200 through the above connection to form an integral force-bearing structure.

[0054] Step 5: Hoisting prefabricated bridge deck.

[0055] The above description is only a description of the preferred embodiment of the utility model, and is not any limitation on the scope of the utility model. Any changes and modifications made by ordinary technicians in the field of the utility model based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A double I-beam combined beam, characterized in that: include: Two side main beams, including a first top plate, a first upper bottom plate, a first lower bottom plate and a first web plate, wherein the first web plate vertically connects the first top plate and the first upper bottom plate, the first lower bottom plate is located below the first upper bottom plate, and the first lower bottom plate and the first upper bottom plate are fixedly connected; and, A steel cross beam is perpendicular to the two side main beams, and the steel cross beam includes a second top plate, a second bottom plate and a second web plate, the second web plate vertically connects the second top plate and the second bottom plate, and one end of the second top plate of the steel cross beam is welded to the first top plate of one of the side main beams, the other end of the second top plate of the steel cross beam is welded to the first top plate of the other side main beam, one end of the second bottom plate of the steel cross beam is welded to the first upper bottom plate of one of the side main beams, the other end of the second bottom plate of the steel cross beam is welded to the first upper bottom plate of the other side main beam, and the thickness of the second bottom plate is equal to the thickness of the first upper bottom plate.

2. The double I-beam combined beam according to claim 1, characterized in that: The first top plate and the second top plate have the same thickness.

3. The double I-beam combined beam according to claim 1, characterized in that: The side main beam also includes a first vertical rib and a second vertical rib, the first vertical rib and the second vertical rib are respectively vertically connected to the first web, and the first vertical rib is respectively connected to the first top plate and the first upper bottom plate, the second vertical rib is respectively connected to the first top plate and the first upper bottom plate, the first vertical rib and the second vertical rib are respectively located on both sides of the first web, one end of the second web is welded to the first vertical rib of one side main beam, and the other end of the second web is welded to the second vertical rib of another side main beam.

4. The double I-beam combined beam according to claim 3, characterized in that: The thickness of the second web is the same as the thickness of the first vertical rib and the second vertical rib.

5. The double I-beam combined beam according to claim 1, characterized in that: The side main beam further includes a first longitudinal stiffening rib, which is perpendicular to the first web plate and parallel to the first top plate, and is located on a side of the side main beam away from the steel cross beam.

6. The double I-beam combined beam according to claim 5, characterized in that: There are multiple first longitudinal stiffening ribs, and the multiple first longitudinal stiffening ribs are arranged in sequence from top to bottom.

7. The double I-beam combined beam according to claim 1, characterized in that: The steel cross beam also includes a third vertical rib plate, which is vertically connected to the second web plate, and the third vertical rib plate is respectively connected to the second top plate and the second bottom plate.

8. The double I-beam combined beam according to claim 7, characterized in that: The number of the third vertical ribs is multiple, and the plurality of third vertical ribs are arranged in sequence along the longitudinal direction of the steel beam.

9. The double I-beam combined beam according to claim 1, characterized in that: The steel beam further includes a second longitudinal stiffening rib, which is perpendicular to the second web plate and parallel to the second top plate.

10. A steel-concrete composite bridge, characterized in that: It comprises a concrete bridge deck and a double I-beam combined beam as claimed in any one of claims 1 to 9, wherein the concrete bridge deck is arranged on the double I-beam combined beam.

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