Width-spliced steel box girder bridge cantilever arm structure

Abstract

The utility model discloses a widening steel box girder bridge cantilever arm structure which comprises a vertically arranged cantilever arm flange and a horizontally arranged top plate, and further comprises a top plate extension section which is integrally connected with the top plate and protrudes out of the cantilever arm flange; the positioning steel plate comprises a horizontal part and a vertical part which are connected with each other, the horizontal part of the positioning steel plate is connected with the cantilever flange in a welding manner, and the width of the horizontal part of the positioning steel plate is the same as that of the top plate extension section. The utility model solves the problem that the prefabricated steel bridge is difficult to splice due to construction errors, is suitable for the widening design of the steel beam bridge with large traffic volume and limited construction conditions, and has the advantages of strong adaptability and matching to the current old bridge, simple and convenient construction and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge engineering, in particular to a cantilever structure of a widened steel box girder bridge. Background Art

[0002] At present, the research on bridge splicing and widening is mainly focused on concrete bridges, and there are very few relevant literatures on steel beam widening design and joint research. Usually, concrete bridges are cast-in-place structures, and the splicing width is easy to adjust, while steel bridges are prefabricated structures, and the splicing width is not easy to control. At the same time, steel box girders are generally prefabricated in the factory in advance and transported to the site for welding and assembly. If the construction error is large, there will be splicing difficulties. Therefore, a steel box girder cantilever structure needs to be set to adapt to the occurrence of such phenomena. Utility Model Content

[0003] The utility model provides a cantilever structure of a widened steel box girder bridge.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A cantilever structure of a widened steel box girder bridge comprises a vertically arranged cantilever flange and a horizontally arranged top plate, and further comprises:

[0006] A top plate extension section, wherein the top plate extension section is integrally connected to the top plate and the top plate extension section protrudes from the cantilever arm flange;

[0007] A positioning steel plate, wherein the positioning steel plate comprises a horizontal portion and a vertical portion connected to each other, the horizontal portion of the positioning steel plate being welded to the cantilever flange, and the width of the horizontal portion of the positioning steel plate being the same as the width of the top plate extension section.

[0008] The above-mentioned widened steel box girder bridge cantilever structure, wherein the thickness of the top plate extension section is the same as the thickness of the top plate, and the standard width of the top plate extension section is six times the thickness of the top plate. At the same time, the width of the top plate extension section can be adjusted by welding or cutting to vary between 0 and 12 times the thickness of the top plate to adapt to the influence of construction errors, etc.

[0009] In the above-mentioned cantilever structure of the widened steel box girder bridge, the positioning steel plate is flush with the bottom of the cantilever of the old bridge in the vertical direction of the cantilever flange.

[0010] In the above-mentioned cantilever structure of the widened steel box girder bridge, the thickness of the positioning steel plate is 10 mm.

[0011] In the above-mentioned cantilever structure of the widened steel box girder bridge, there is a gap between the end of the top plate extension section and the end of the old bridge.

[0012] The above-mentioned cantilever structure of the widened steel box girder bridge, wherein the top plate extension section and the positioning steel plate are both located at the joint position of the new bridge steel beam and the old bridge, and fillers are provided at the joint position of the new bridge steel beam and the old bridge, and the fillers are filled to the end of the top plate extension section and the end of the positioning steel plate.

[0013] In the above-mentioned cantilever structure of the widened steel box girder bridge, the filler includes a first sealant, a foam board and a second sealant in order from bottom to top.

[0014] The above-mentioned cantilever structure of the widened steel box girder bridge, wherein a U-shaped water receiving box and a drainage pipe connected to the U-shaped water receiving box are provided below the filler;

[0015] The side surface of the U-shaped water receiving box is flush with the end of the positioning steel plate.

[0016] In the above-mentioned cantilever structure of the widened steel box girder bridge, the upper surface of the steel beam of the new bridge and the upper surface of the old bridge are both provided with pavement, and elastic concrete is provided between the two pavings, and the elastic concrete covers the top plate extension section.

[0017] In the above-mentioned cantilever structure of the widened steel box girder bridge, the horizontal portion of the positioning steel plate is welded to the cantilever flange through a fillet weld.

[0018] Due to the adoption of the above technology, the utility model has the following positive effects compared with the prior art:

[0019] (1) The utility model solves the problem of difficulty in splicing prefabricated steel bridges caused by construction errors. It is suitable for the widening design of steel beam bridges with large traffic volume and limited construction conditions. It has the advantages of strong adaptability and matching to existing old bridges and simple and convenient construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the cantilever structure of the widened steel box girder bridge of the utility model.

[0021] Figure 2 It is a schematic diagram of the cantilever structure of the widened steel box girder bridge of the utility model.

[0022] The symbols in the drawings of the specification include:

[0023] 1. Cantilever flange; 2. Top plate; 3. Top plate extension section; 4. Positioning steel plate; 41. Horizontal part; 42. Vertical part; 51. First sealant; 52. Foam board; 53. Second sealant; 54. U-shaped water collection box; 55. Drain pipe; 56. Pavement; 57. Elastic concrete; A. New bridge; B. Old bridge. DETAILED DESCRIPTION

[0024] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “inside”, “outside”, “front”, “back”, “lateral” and “vertical” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention. They do not indicate or imply that the device or component referred to must have a specific direction and therefore should not be understood as a limitation on the present invention.

[0026] It should be specially explained that the terms “horizontal” and “vertical” in the present invention are used to illustrate a rough positional relationship, rather than a strict “horizontal plane” or “vertical plane”.

[0027] See also Figure 1 to Figure 2 As shown, a preferred embodiment of a cantilever structure of a widened steel box girder bridge is shown, including a vertically arranged cantilever flange 1 and a horizontally arranged top plate 2, wherein it also includes: a top plate extension section 3 and a positioning steel plate 4, the top plate extension section 3 is integrally connected to the top plate 2, and the top plate extension section 3 protrudes from the cantilever flange 1; the positioning steel plate 4 includes a horizontal portion 41 and a vertical portion 42 connected to each other, the horizontal portion 41 of the positioning steel plate 4 is welded to the cantilever flange 1, and the width of the horizontal portion of the positioning steel plate 42 is the same as the width of the top plate extension section 3.

[0028] Specifically, the top plate extension section 3 is arranged to accommodate construction errors at the joints and solve the problem of difficulty in splicing the steel box beams at the bridge joints.

[0029] Furthermore, as a preferred embodiment, the thickness of the top plate extension section 3 is the same as the thickness of the top plate 2, and the standard width of the top plate extension section 3 is six times the thickness of the top plate 2. At the same time, the width of the top plate extension section can be adjusted by welding or cutting to vary between 0 and 12 times the thickness of the top plate to accommodate the influence of construction errors, etc.

[0030] Further, as a preferred embodiment, the positioning steel plate 4 is located in the middle of the cantilever flange 1 in the vertical direction.

[0031] Further, as a preferred embodiment, the thickness of the positioning steel plate 4 is 10 mm.

[0032] Further, as a preferred embodiment, there is a gap between the end of the top plate extension section 3 and the end of the old bridge B. Preferably, the width of the gap is 20 mm, so that the new and old bridge structures are separated, each of which is subjected to a clear force, and the interaction between the new and old structures is less affected.

[0033] Furthermore, as a preferred embodiment, the top plate extension section 3 and the positioning steel plate 4 are both located at the joints between the steel beams of the new bridge A and the old bridge B, and fillers are provided at the joints between the steel beams of the new bridge A and the old bridge B, and the fillers are filled to the ends of the top plate extension section 3 and the ends of the positioning steel plate 4.

[0034] Further, as a preferred embodiment, the filler includes a first sealant 51, a foaming board 52 and a second sealant 53 from bottom to top.

[0035] Furthermore, as a preferred embodiment, a U-shaped water receiving box 54 and a drainage pipe 55 connected to the U-shaped water receiving box 54 are provided below the filler.

[0036] Further, as a preferred embodiment, the side surface of the U-shaped water receiving box 54 is flush with the end of the positioning steel plate 4 .

[0037] Furthermore, as a preferred embodiment, the upper surface of the steel beam of the new bridge A and the upper surface of the old bridge B are both provided with pavement 56, and elastic concrete 57 is provided between the two pavings 56, and the elastic concrete 57 covers the top plate extension section 3.

[0038] Further, as a preferred embodiment, the top plate extension section 3, the positioning steel plate 4 and the first sealant 51 between the joints, the foam board 52 and the second sealant 53, and the U-shaped water collection box 54 are integrated into one, and elastic GD concrete is laid on top to connect with the old bridge B.

[0039] Further, as a preferred embodiment, the horizontal portion of the positioning steel plate 4 is welded to the cantilever flange 1 through a fillet weld.

[0040] The present embodiment also provides a construction method for widening the cantilever structure of a steel box girder bridge, wherein the top plate extension section 3 of the steel box girder cantilever and the top plate 2 of the steel box girder are constructed simultaneously, and then the positioning steel plate 3 is welded to the cantilever flange 1, and the joints are connected to the old bridge B by filling the first sealant 51, foam board 52, second sealant 53, elastic concrete 57, etc.

[0041] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A cantilever structure of a widened steel box girder bridge, comprising a vertically arranged cantilever flange and a horizontally arranged top plate, characterized in that: Also includes: A top plate extension section, wherein the top plate extension section is integrally connected to the top plate and the top plate extension section protrudes from the cantilever arm flange; A positioning steel plate, wherein the positioning steel plate comprises a horizontal portion and a vertical portion connected to each other, the horizontal portion of the positioning steel plate being welded to the cantilever flange, and the width of the horizontal portion of the positioning steel plate being the same as the width of the top plate extension section.

2. The cantilever structure of the widened steel box girder bridge according to claim 1 is characterized in that: The thickness of the top plate extension section is the same as the thickness of the top plate, and the standard width of the top plate extension section is six times the thickness of the top plate.

3. The cantilever structure of the widened steel box girder bridge according to claim 1 is characterized in that: The positioning steel plate is flush with the bottom of the cantilever arm of the old bridge in the vertical direction of the cantilever arm flange.

4. The cantilever structure of the widened steel box girder bridge according to claim 1 is characterized in that: The thickness of the positioning steel plate is 10 mm.

5. The cantilever structure of the widened steel box girder bridge according to claim 1 is characterized in that: There is a gap between the end of the top plate extension section and the end of the old bridge.

6. The cantilever structure of the widened steel box girder bridge according to claim 1 is characterized in that: The top plate extension section and the positioning steel plate are both located at the joint between the new bridge steel beam and the old bridge. Fillers are provided at the joint between the new bridge steel beam and the old bridge, and the fillers are filled to the ends of the top plate extension section and the ends of the positioning steel plate.

7. The cantilever structure of the widened steel box girder bridge according to claim 6 is characterized in that: The filler includes a first sealant, a foaming board and a second sealant in order from bottom to top.

8. The cantilever structure of the widened steel box girder bridge according to claim 7 is characterized in that: A U-shaped water receiving box and a drainage pipe connected to the U-shaped water receiving box are provided below the filler; The side surface of the U-shaped water receiving box is flush with the end of the positioning steel plate.

9. The cantilever structure of the widened steel box girder bridge according to claim 8 is characterized in that: The upper surface of the steel beam of the new bridge and the upper surface of the old bridge are both provided with pavement, and elastic concrete is provided between the two pavements, and the elastic concrete covers the top plate extension section.

10. The cantilever structure of the widened steel box girder bridge according to claim 1 is characterized in that: The horizontal portion of the positioning steel plate is welded to the cantilever flange via a fillet weld.

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