Combined small box girder bridge opening inclined bracing type steel cross beam reinforcing structure

Abstract

The application discloses a kind of combined small box girder bridge opening inclined brace type steel cross beam reinforcing structure, including box girder bottom length member N3, two inclined braces N2 between box girder and rectangular steel plate N1 on the web of adjacent two box girders, the both ends of inclined brace N2 are connected with welded steel plate N6 on length member N3 and N1 by welding, rectangular steel plate N1 is connected with the web of adjacent two box girders by bolt connection;At the position of box girder bottom plate, rectangular steel plate N4 is connected with box girder bottom plate by bolt connection, rectangular steel plate N4 and length member N3 are welded and connected by adjusting wedge block member N5 between them, by adjusting the thickness of adjusting wedge block member N5, to ensure the effective connection of length member N3 and rectangular steel plate N4, avoid appearing local emptying, guarantee the force transmission requirement of bending and shear resistance between small box girders, so that each girder can better bear force together;Steel member can be prefabricated in factory, convenient construction, construction speed is faster.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of bridge structure reinforcement, in particular to a combined small box girder bridge opening diagonal bracing type steel cross beam reinforcement structure. BACKGROUND

[0002] The small box girder structure form can well meet the requirements of high-speed, stable and comfortable driving of high-grade highways due to its large torsional strength and bending strength. The main girder of the assembled small box girder bridge can also be prefabricated in the factory, which is not affected by the weather. Therefore, it also has the characteristics of suitable for large-scale production and fast construction, so the small box girder structure has become one of the relatively mature bridge structure forms and is widely used in medium-span bridges. However, due to the limitations of early understanding, many small box girders are designed without middle cross beams, which leads to poor lateral stress performance of the small box girder bridge. Under the action of load, the lateral main girders cannot better share the load, and the load is mainly borne by the small box girders near the load action position, while the small box girders far from the load action position bear less load. Under the repeated action of vehicle load, the small box girders that bear more load produce diseases in the subsequent use process, which affects the bearing capacity and normal use performance. Therefore, it is necessary to reinforce these built small box girders to improve their bearing capacity and normal use performance and prolong their service life.

[0003] The added cross beam measure can strengthen the lateral connection between the main girders of the combined small box girder bridge and make the load more evenly distributed in the lateral direction of the bridge.

[0004] The steel cross beam is a more economical and fast structure, which has the advantages of light weight, strong tensile capacity and simple construction compared with other cross beams, and the construction period of the steel cross beam structure is shorter. SUMMARY

[0005] The present application aims to provide a combined small box girder bridge opening diagonal bracing type steel cross beam reinforcement structure to ensure the bending and shearing force transmission requirements between the small box girders and make the main girders better share the load.

[0006] To achieve the above functions, the present application designs a combined small box girder bridge opening diagonal bracing type steel cross beam reinforcement structure, which adopts the following reinforcement structure for each box girder under the target small box girder bridge to realize the structural reinforcement of the target small box girder bridge.

[0007] The reinforcing structure comprises a longitudinal member N3 at the bottom of each box girder, a rectangular steel plate N4 at the bottom of each box girder, a leveling wedge member N5 for connecting the rectangular steel plate N4 and the longitudinal member N3, and two inclined bracing members N2 between two adjacent box girders, a rectangular steel plate N1 corresponding to the number of the inclined bracing members N2, and a welded steel plate N6 for connecting the two inclined bracing members N2 and the longitudinal member N3;

[0008] In the same cross section of each box girder under the target small box girder bridge, the height difference between the bottom of each box girder and the longitudinal member N3, the number of the rectangular steel plate N4 and the leveling wedge member N5 corresponds to the box girder, one side of each rectangular steel plate N4 is fixedly connected to the bottom of each box girder through bolts, and the other side is welded to the leveling wedge member N5, the bottom of each leveling wedge member N5 is welded to the longitudinal member N3, and the thickness of each leveling wedge member N5 corresponds to the height difference between the bottom of each box girder and the longitudinal member N3.

[0009] Each rectangular steel plate N1 is fixed on the box girder web of each box girder through bolts, one end of the inclined bracing member N2 between two adjacent box girders is welded to the rectangular steel plate N1, and the other end is welded to the welded steel plate N6 between the two adjacent box girders, and the bottom of the welded steel plate N6 is fixedly welded to the longitudinal member N3.

[0010] As a preferred technical solution of the present application: the length of each rectangular steel plate N4 and each leveling wedge member N5 is equal to the width of the bottom of each box girder, the cross section of the leveling wedge member N5 and the longitudinal member N3 is rectangular, the width of the cross section of the leveling wedge member N5 is smaller than the width of the rectangular steel plate N4, and the width of the cross section of the longitudinal member N3 is smaller than the width of the cross section of the leveling wedge member N5.

[0011] As a preferred technical solution of the present application: each leveling wedge member N5 is filled with non-shrinkage self-compacting reinforcing material inside and is wrapped with metal outside.

[0012] As a preferred technical solution of the present application: each rectangular steel plate N1 and rectangular steel plate N4 has a hole in the four corners and is fixedly connected to the bottom of each box girder and the box girder web through bolts, respectively.

[0013] As a preferred technical solution of the present application: the bolt connection position of each rectangular steel plate N4 and rectangular steel plate N1 to the bottom of each box girder and the box girder web avoids the position of the original steel bars and prestressed steel bars of each box girder.

[0014] Advantages: Compared with the prior art, the present application has the following advantages:

[0015] The open diagonal bracing type steel cross beam reinforcing structure of the combined small box girder bridge can better meet the force transmission requirements of the bending and shearing resistance between the box girders, effectively improve the lateral stress performance of the small box girder bridge, and make the main girders better bear stress together under the action of the load.

[0016] In the engineering background of the subsequent construction and reinforcement treatment of the built combined small box girder, the cross beam design of the present application facilitates the field construction, the components mainly playing the bending resistance role are arranged in the box girder bottom in the transverse and longitudinal directions, after the corresponding connecting components are installed, the N3 rods between the box girders can be installed at one time, thereby simplifying the construction steps, avoiding that all the construction work of the cross beam needs to be carried out between the box girders with small space, improving the construction comfort and facilitating the construction.

[0017] The leveling wedge is arranged above the longitudinal rod N3 in the box girder bottom, the thickness of the leveling wedge is adjusted to ensure the effective connection between the longitudinal cross beam component and the box girder part, and the direct connection between the longitudinal cross beam component and the box girder bottom is avoided, so that the box girder bottom is not located on a straight line due to the early construction or later load bearing of the box girder, the rod N3 is designed in a straight line, thereby causing the insufficient local connection between the cross beam and the box girder bottom plate, and causing the difficulty in the subsequent construction.

[0018] Compared with other cross beams, the steel cross beam is more economical and fast, has the advantages of light weight, strong tensile capacity and simple construction, and has a short total construction period, in addition, the steel component can be prefabricated in a factory, thereby omitting the concrete construction formwork, steel bar binding, pouring and maintenance and other links, facilitating the field construction, being fast and convenient for popularization. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a whole schematic view of the open diagonal bracing type steel cross beam reinforcing structure of the combined small box girder bridge according to the embodiment of the present application;

[0020] Figure 2 It is a partial enlarged schematic view of the open diagonal bracing type steel cross beam reinforcing structure of the combined small box girder bridge according to the embodiment of the present application;

[0021] Figure 3 It is a cross section view of the open diagonal bracing type steel cross beam reinforcing structure of the combined small box girder bridge according to the embodiment of the present application;

[0022] Figure 4 It is a schematic view of the rectangular steel plate N1 in the open diagonal bracing type steel cross beam reinforcing structure of the combined small box girder bridge according to the embodiment of the present application. DETAILED DESCRIPTION

[0023] The application will be further described below with reference to the drawings. The following examples are only used to more clearly illustrate the technical solutions of the application, and cannot be used to limit the protection scope of the application.

[0024] The combined small box girder bridge opening diagonal bracing type steel cross beam reinforcing structure provided by the embodiment of the application is used for reinforcing the structure of the target small box girder bridge.

[0025] With reference to Figure 1 The reinforcing structure comprises a lengthwise member N3 located at the bottom of each box girder, a rectangular steel plate N4 located at the bottom of each box girder respectively, a leveling wedge member N5 used for connecting the rectangular steel plate N4 and the lengthwise member N3, and the reinforcing structure between two adjacent box girders each comprises two diagonal bracing members N2, a number of rectangular steel plates N1 corresponding to the diagonal bracing members N2, and a welded steel plate N6 used for connecting the two diagonal bracing members N2 and the lengthwise member N3.

[0026] The lengthwise member N3 is a straight rod located at the bottom of each box girder and perpendicular to the direction of the box girder body.

[0027] The strength of the steel used in each member and steel plate should be determined according to the reinforcing requirements of the specific bridge. Under the same conditions, the greater the strength of the steel, the better the reinforcing effect.

[0028] With reference to Figure 1 , Figure 2 In the same cross section of each box girder under the target small box girder bridge, the bottoms of the box girders are not strictly collinear, and there is a height difference between the bottoms of the box girders and the lengthwise member N3. The number of the rectangular steel plates N4 and the leveling wedge members N5 corresponds to the box girders. One side of each rectangular steel plate N4 is fixedly connected to the bottom of each box girder through a bolt, and the other side is welded to the leveling wedge member N5. The bottom of each leveling wedge member N5 is welded to the lengthwise member N3. The thickness of each leveling wedge member N5 corresponds to the height difference between the bottom of the box girder and the lengthwise member N3. The effective connection between the lengthwise member N3 and the rectangular steel plate N4 is ensured by adjusting the thickness of the leveling wedge N5.

[0029] Each rectangular steel plate N1 is fixed on the box girder web of each box girder through a bolt. One end of each of the two diagonal bracing members N2 between two adjacent box girders is welded to the corresponding rectangular steel plate N1. The other end of each of the two diagonal bracing members N2 is welded to the welded steel plate N6 between the two adjacent box girders at a preset included angle. The bottom of the welded steel plate N6 is fixedly welded to the lengthwise member N3.

[0030] With reference to Figure 3The length of each rectangular steel plate N4 and each leveling wedge member N5 is equal to the width of the bottom of each box girder, the cross section of the leveling wedge member N5 and the length member N3 is rectangular, the width of the cross section of the leveling wedge member N5 is smaller than the width of the rectangular steel plate N4, and the width of the cross section of the length member N3 is smaller than the width of the cross section of the leveling wedge member N5.

[0031] Each leveling wedge member N5 is filled with non-shrinkage self-compacting reinforcing material inside and is wrapped with metal outside, and the grade of the non-shrinkage self-compacting reinforcing material filled inside should be not lower than the grade of the box girder concrete.

[0032] The angle between the two diagonal bracing members N2 between two adjacent box girders can be adjusted according to the distance between the two box girders of the specific bridge under the premise that the upper end of the diagonal bracing member N2 is located in the range of the web of the box girder, but the angle should not be too large.

[0033] The diagonal bracing member N2 can be a small I-shaped steel, a channel steel or the like, and the length member N3 is a rectangular steel pipe.

[0034] Referring to Figure 4 Each rectangular steel plate N1 and N4 is provided with holes at four corners and is fixedly connected to the bottom and the web of each box girder by bolts respectively. The bolt connection is achieved by using chemical bolts, and before drilling, the position of the steel bars in the girder should be ascertained, and the drilling position can be adjusted appropriately if there is a conflict.

[0035] The bolt connection position of each rectangular steel plate N4 and N1 to the bottom and the web of each box girder avoids the position of the steel bars and the prestressed steel bars of the original structure of each box girder.

[0036] The construction method of the combined small box girder bridge opening diagonal bracing type steel cross beam reinforcing structure provided by the embodiment of the present application comprises the following sequential steps:

[0037] Construction preparation → concrete polishing and drilling, steel plate reserved bolt hole → installation of rectangular steel plates N1 and N4 → installation of welded steel plate N6 → installation of leveling wedge member N5 → injection of non-shrinkage self-compacting reinforcing material into the steel pipe of the leveling wedge member N5 → welding of the length member N3 and the leveling wedge member N5 → welding of the diagonal bracing member N2 → corrosion protection treatment of the steel structure surface.

[0038] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the present application.

Claims

1. A combined small box girder bridge opening diagonal bracing type steel cross girder reinforcing structure, characterized in that, The reinforcing structure comprises a length member N3 at the bottom of each box girder, a rectangular steel plate N4 at the bottom of each box girder, a leveling wedge member N5 for connecting the rectangular steel plate N4 and the length member N3, two inclined bracing members N2 between two adjacent box girders, a rectangular steel plate N1 corresponding to the inclined bracing member N2, and a welded steel plate N6 for connecting the two inclined bracing members N2 and the length member N3. In the same cross section of each box girder under the target small box girder bridge, there is a height difference between the bottom of each box girder and the length member N3, the number of the rectangular steel plate N4 and the leveling wedge member N5 corresponds to the box girder, one side of each rectangular steel plate N4 is fixedly connected to the bottom of each box girder through bolts, and the other side is welded to the leveling wedge member N5, the bottom of each leveling wedge member N5 is welded to the length member N3, and the thickness of each leveling wedge member N5 corresponds to the height difference between the bottom of each box girder and the length member N3. Each rectangular steel plate N1 is fixed to the box girder web of each box girder through bolts, one end of the inclined bracing member N2 between two adjacent box girders is welded to the rectangular steel plate N1, and the other end is welded to the welded steel plate N6 between the two adjacent box girders, and the bottom of the welded steel plate N6 is fixedly welded to the length member N3. The length of each rectangular steel plate N4 and each leveling wedge member N5 is equal to the width of the bottom of each box girder, the cross section of the leveling wedge member N5 and the length member N3 is rectangular, the width of the cross section of the leveling wedge member N5 is smaller than the width of the rectangular steel plate N4, and the width of the cross section of the length member N3 is smaller than the width of the cross section of the leveling wedge member N5. Each leveling wedge member N5 is filled with non-shrinkage self-compacting reinforcing material inside and wrapped with metal outside.

2. The combined small box girder bridge opening diagonal bracing type steel cross girder reinforcing structure according to claim 1, characterized in that, Each rectangular steel plate N1 and rectangular steel plate N4 has holes in the four corners and is fixedly connected to the bottom of each box girder and the box girder web through bolts, respectively.

3. The combined small box girder bridge opening diagonal bracing type steel cross girder reinforcing structure according to claim 1, characterized in that, The bolt connection positions of each rectangular steel plate N4 and rectangular steel plate N1 to the bottom of each box girder and the box girder web avoid the positions of the original steel bars and prestressed steel bars of each box girder.

4. The combined small box girder bridge opening diagonal bracing type steel cross girder reinforcing structure according to claim 1, characterized in that, ​

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