Fabricated steel box girder transverse connecting structure and construction method

Abstract

The invention discloses a fabricated steel box girder transverse connecting structure and a construction method, and relates to the technical field of bridge engineering. The steel box girder transverse connecting device comprises a transverse connecting piece, a plurality of connecting holes are formed in the two ends of the transverse connecting piece in the width direction, and each connecting hole is of a non-closed-loop structure with an opening; when the steel box girders are transversely connected, the transverse connecting pieces are connected to the connecting positions of the two adjacent steel box girders, and the transverse connecting pieces are connected with the two adjacent steel box girders correspondingly, so that the connecting holes in the two ends of each transverse connecting piece are located above the two adjacent steel box girders correspondingly. According to the fabricated steel box girder transverse connecting structure, transverse connection between the two steel box girders is achieved through the transverse connecting piece, the connecting speed between the steel box girders is increased, and meanwhile the connecting quality between the steel box girders is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering, and more particularly to an assembled steel box girder transverse connection structure and a construction method. Background Art

[0002] As an important bridge structure, prefabricated steel box girder bridges have been widely used in modern bridge construction. They have the advantages of fast construction speed, high degree of industrialization, and superior structural performance, and can effectively meet the needs of urban transportation and infrastructure construction. However, in the construction process of prefabricated steel box girder bridges, transverse splicing technology has always been a key problem, especially in the connection problem between adjacent steel box girders, which requires in-depth research and discussion.

[0003] In the context of industrial prefabrication, there are significant differences in the production and processing accuracy of each steel box girder. Affected by factors such as steel plate rolling tolerance, cutting equipment accuracy, and welding thermal deformation, there are obvious deviations between the top plates of different steel box girders. When these components with geometric deviations are hoisted at high altitude, the dislocation deformation between adjacent beam sections presents nonlinear distribution characteristics due to the combined influence of gravity, temperature deformation, and construction load. This geometric dislocation directly leads to the loss of control of weld formation quality: forced welding will produce serious defects such as undercut and lack of fusion, and the effective cross-sectional area of ​​the weld will lose more than 30%; the uneven distribution of residual stress will cause local stress concentration, and the fatigue life is low. In view of the limitations of welding technology, the engineering community has tried a variety of alternative solutions. Although high-strength bolt connections can achieve rapid assembly, they are subject to the machining accuracy of the bolt hole group and are prone to slippage under dynamic loads; although the riveting process is reliable, the construction efficiency is extremely low, and the installation of a single rivet takes up to 15 minutes, and special riveting equipment is required.

[0004] Therefore, how to provide a transverse connection structure with fast construction speed and reliable connection quality is a problem that technical personnel in this field need to solve urgently. Summary of the invention

[0005] In view of this, the present invention provides a prefabricated steel box girder transverse connection structure and construction method to accelerate the speed of the steel box girder transverse connection and ensure the quality of the steel box girder transverse connection. In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] In one aspect, the present invention provides a fabricated steel box girder transverse connection structure for transverse connection of steel box girders, comprising:

[0007] The transverse connecting piece is provided with a plurality of connecting holes at both ends in the width direction, and each of the connecting holes has an open non-closed loop structure;

[0008] Wherein, when the steel box girders are connected transversely, the transverse connector is connected at the connection between two adjacent steel box girders, and the transverse connector is respectively connected to the two adjacent steel box girders so that the connection holes at both ends of the transverse connector are respectively located above the two adjacent steel box girders.

[0009] Furthermore, both ends of the transverse connecting member provided with the connecting holes are gear-tooth shaped, and the connecting holes are provided on the tooth portions of the gear-tooth shaped.

[0010] Furthermore, a steel pipe connector is provided at the upper end of the connecting hole, and the shape of the steel pipe connector is the same as that of the connecting hole.

[0011] Furthermore, the opening directions of all the connection holes located at the same end of the transverse connecting member are the same or different.

[0012] Furthermore, the openings of the connection holes at both ends of the transverse connecting member are symmetrically arranged.

[0013] Furthermore, the opening on the connecting hole occupies 1 / 4-1 / 3 of the circumference of the connecting hole.

[0014] Furthermore, the top plate of the steel box girder is connected to the transverse connector by epoxy resin glue.

[0015] On the other hand, the present invention also provides a construction method of a prefabricated steel box girder transverse connection structure, the construction method is the construction using the above-mentioned prefabricated steel box girder transverse connection structure, comprising the following steps:

[0016] S10: placing multiple steel box girders to be transversely spliced ​​on adjacent bridge supports, and adjusting the width of the splicing seams to meet the design requirements;

[0017] S20: Install transverse connectors to complete the connection of the two steel box girders;

[0018] S30: welding studs on the steel box girder;

[0019] S40: installing a steel mesh between the welding nails so that the steel mesh covers the steel box girder;

[0020] S50: pour concrete so that the concrete covers the steel mesh to connect multiple steel box girders into a whole.

[0021] Furthermore, concrete is injected into the connection hole so that the transverse connection piece and the concrete become one.

[0022] It can be seen from the above technical solution that, compared with the prior art, the present invention discloses a prefabricated steel box girder transverse connection structure, which realizes the transverse connection between two steel box girders through transverse connecting parts, pours concrete in the connecting holes, strengthens the connection between the two steel box girders, speeds up the connection speed between the steel box girders, and ensures the connection quality between the steel box girders. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0024] Figure 1 A schematic structural diagram of the assembled steel box girder transverse connection structure provided by the present invention;

[0025] Figure 2 A partial structural schematic diagram of the assembled steel box girder transverse connection structure provided by the present invention;

[0026] Figure 3 A partial top view of the assembled steel box girder transverse connection structure provided by the present invention;

[0027] Figure 4 A front view of the transverse connecting member provided by the present invention;

[0028] Figure 5 This is a schematic structural diagram of the transverse connecting member provided by the present invention.

[0029] In the figure: 1. Steel box girder; 2. Cantilever flange; 3. Steel top plate; 4. Concrete; 5. Welding nails; 6. Steel mesh; 7. Splicing seam; 8. Horizontal connector; 9. Steel pipe connector; 10. Opening; 11. Connection hole. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0031] See also Figure 1-5 , an embodiment of the present invention discloses a transverse connection structure of an assembled steel box girder and a construction method.

[0032] On the one hand, the present invention provides a fabricated steel box girder transverse connection structure for transverse connection of a steel box girder 1, comprising:

[0033] The transverse connecting member 8 is provided with a plurality of connecting holes 11 at both ends in the width direction, and each connecting hole 11 is a non-closed loop structure with an opening 10;

[0034] Among them, when the steel box girder 1 is connected transversely, the transverse connector 8 is connected to the connection between two adjacent steel box girders 1, and the transverse connector 8 is connected to the two adjacent steel box girders 1 respectively, so that the connection holes 11 at both ends of the transverse connector 8 are respectively located above the two adjacent steel box girders 1.

[0035] In some embodiments, cantilever flanges 2 are provided at both transverse ends of the steel box girder 1, and the top plate of the steel box girder 1 and the top plate of the cantilever flange 2 are spliced ​​together to form a steel top plate 3. A splicing seam 7 is provided between two adjacent cantilever flanges 2 located on different steel box girders 1, and a transverse connecting piece 8 is connected above the splicing seam 7. By connecting the transverse connecting piece 8 to two adjacent steel top plates 3, the connection between the two adjacent steel box girders 1 is completed, thereby realizing a quick connection between the two adjacent steel box girders 1.

[0036] A plurality of welding nails 5 are evenly welded on the steel top plate 3, and a steel mesh 6 is installed between the welding nails 5, concrete 4 is poured into the steel mesh 6, and the concrete 4 is injected into the connecting hole 11 so that the concrete 4 covers the steel mesh 6, thereby completing the transverse connection between the steel box girders 1.

[0037] In some embodiments, both ends of the transverse connecting member 8 where the connecting holes 11 are provided are gear-tooth shaped, and the connecting holes 11 are provided on the toothed portion of the gear-tooth shaped.

[0038] By providing the transverse connector 8 with connecting holes 11 at both ends in a gear-tooth shape, the contact area between the transverse connector 8 and the concrete is increased, the bonding strength between the transverse connector 8 and the concrete is improved, and at the same time, the shear force can be resisted, reducing the risk of slippage between the transverse connector 8 and the steel box girder 1.

[0039] In some embodiments, a steel pipe connector 9 is disposed at the upper end of the connecting hole 11 , and the shape of the steel pipe connector 9 is the same as that of the connecting hole 11 .

[0040] In some embodiments, a welding pin 5 is disposed in the connecting hole 11 .

[0041] By welding the steel pipe connector 9 above the connecting hole 11 , the strength of the connecting hole 11 of the transverse connector 8 is enhanced, thereby extending the service life of the transverse connector 8 .

[0042] When there is a tendency of lateral sliding between the lateral connection structure and the steel top plate 3, the steel pipe connector 9 constrains the contact pressure transmission between the concrete 4 inside the steel pipe connector 9 and the welding nails 5, effectively limiting the lateral relative sliding between the steel top plate 3 and the lateral connection structure.

[0043] In some embodiments, the openings 10 of all the connection holes 11 located at the same end of the transverse connector 8 are in the same or different directions.

[0044] In some embodiments, the openings 10 of all the connection holes 11 located at the same end of the transverse connecting member 8 are oriented in the same direction.

[0045] During the construction process, concrete 4 is injected into the opening 10 and the steel pipe connector 9. When there is a tendency of lateral sliding between the transverse connector 8 and the steel top plate 3, the opening 10 of the steel pipe connector 9 and the connecting hole 11 limits the separation of the concrete 4 in the steel pipe connector 9 and the connecting hole 11 from the steel pipe connector 9 and the transverse connector 8, thereby strengthening the connection strength between the concrete 4 and the transverse connector 8 and the steel pipe connector 9. With the help of the shear-resistant connection between the transverse connector 8 and the concrete 4, and the concrete 4 and the steel top plate 3, the effect of strengthening the transverse connection between the steel box girders 1 is achieved.

[0046] In some embodiments, the openings 10 of all the connection holes 11 located at the same end of the transverse connector 8 are in different directions, thereby strengthening the connection between the steel pipe connector 9 and the transverse connector 8 and the concrete 4 in different directions, and strengthening the connection effect between the two steel box girders 1.

[0047] In some embodiments, the openings 10 of the connecting holes 11 at both ends of the transverse connector 8 are symmetrically arranged, and the number of connecting holes 11 at both ends of the transverse connector 8 is the same, so that the forces at both ends of the transverse connector 8 are equal, thereby extending the service life of the transverse connector 8 and improving the transverse connection strength between the two steel box girders 1.

[0048] In some embodiments, the opening 10 on the connecting hole 11 occupies 1 / 4-1 / 3 of the circumference of the connecting hole 11 .

[0049] In some embodiments, the top plate of the steel box girder 1 is connected to the transverse connector 8 by epoxy resin glue.

[0050] On the other hand, the present invention also provides a construction method of a prefabricated steel box girder transverse connection structure, the construction method is to use the above-mentioned prefabricated steel box girder transverse connection structure for construction, comprising the following steps:

[0051] S10: placing a plurality of steel box girders 1 to be transversely spliced ​​on adjacent bridge supports, and adjusting the width of the splicing seams 7 to meet the design requirements;

[0052] S20: Install the transverse connector 8 to complete the connection of the two steel box girders 1;

[0053] S30: welding the welding studs 5 on the steel box girder 1;

[0054] S40: installing the steel mesh 6 between the welding nails 5 so that the steel mesh covers the steel box girder;

[0055] S50: pouring concrete 4 so that the concrete 4 covers the steel mesh 6, so that the multiple steel box girders 1 are connected into a whole.

[0056] In some embodiments, concrete 4 is injected into the connection hole 11 so that the transverse connector 8 is integrated with the concrete.

[0057] Concrete 4 is injected into the connection hole 11, and the mutual movement between the concrete 4 inside the connection hole 11 and the transverse connector 8 is limited through the opening 10 on the connection hole 11, so as to strengthen the connection between the concrete 4 and the transverse connector 8 and strengthen the connection effect between the steel box girders 1.

[0058] During the construction process, the steel box girder 1 to be transversely connected is first hoisted to a suitable position, the contact interface between the steel box girder 1 and the transverse connector 8 is polished clean, and the transverse connector 8 is connected to the top of two adjacent steel box girders by epoxy resin glue. The connection holes 11 at both ends of the transverse connector 8 are respectively located on the two steel box girders, and the welding nails 5 are welded on the steel box girder 1. The welding nails 5 closest to the transverse connector 8 are welded in the connection holes 11, and the steel mesh 6 is tied between the welding nails 5 so that the steel mesh 6 covers multiple steel box girders, and then concrete 4 is poured into the steel mesh 6 so that the concrete 4 covers the entire steel mesh, thereby completing the transverse connection of multiple steel box girders 1.

[0059] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0060] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one 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 rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An assembled steel box girder transverse connection structure, used for transverse connection of steel box girders, characterized in that: include: The transverse connecting piece is provided with a plurality of connecting holes at both ends in the width direction, and each of the connecting holes has an open non-closed loop structure; Wherein, when the steel box girders are connected transversely, the transverse connector is connected at the connection between two adjacent steel box girders, and the transverse connector is respectively connected to the two adjacent steel box girders so that the connection holes at both ends of the transverse connector are respectively located above the two adjacent steel box girders.

2. The assembled steel box girder transverse connection structure according to claim 1, characterized in that: Both ends of the transverse connecting member provided with connecting holes are gear-tooth shaped, and the connecting holes are arranged on the toothed parts of the gear-tooth shaped.

3. The assembled steel box girder transverse connection structure according to claim 1, characterized in that: A steel pipe connector is provided at the upper end of the connecting hole, and the shape of the steel pipe connector is the same as that of the connecting hole.

4. The assembled steel box girder transverse connection structure according to claim 1, characterized in that: The opening directions of all the connection holes located at the same end of the transverse connecting member are the same or different.

5. The assembled steel box girder transverse connection structure according to claim 4, characterized in that: The openings of the connection holes at both ends of the transverse connecting member are symmetrically arranged.

6. The assembled steel box girder transverse connection structure according to claim 1, characterized in that: The opening on the connecting hole occupies 1 / 4-1 / 3 of the circumference of the connecting hole.

7. The assembled steel box beam transverse connection structure according to claim 1, characterized in that: The top plate of the steel box girder is connected to the transverse connector by epoxy resin glue.

8. A construction method for a prefabricated steel box girder transverse connection structure, characterized in that: The construction method uses the construction of the assembled steel box girder transverse connection structure according to claims 1 to 7, and comprises the following steps: S10: placing multiple steel box girders to be transversely spliced ​​on adjacent bridge supports, and adjusting the width of the splicing seams to meet the design requirements; S20: Install transverse connectors to complete the connection of the two steel box girders; S30: welding studs on the steel box girder; S40: installing a steel mesh between the welding nails so that the steel mesh covers the steel box girder; S50: pour concrete so that the concrete covers the steel mesh to connect multiple steel box girders into a whole.

9. The construction method of the assembled steel box beam transverse connection structure according to claim 8, characterized in that: Pour concrete into the connection holes so that the transverse connectors become one with the concrete.

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