Temporary fixing device for steel box girder welding

Abstract

The utility model relates to the field of bridge construction, especially weld steel box girder's temporary positioning spare's structure design, a kind of temporary fixing device for steel box girder welding, including the butt joint of the adjacent two steel box girder upper welding of board unit, the first welding hole and the second welding hole are symmetrically opened in the length direction of the board unit two sides, the center line of the first welding hole and the second welding hole is perpendicular to the extension direction of the butt joint;The positioning structure for cutting is opened between the first welding hole and the second welding hole in the length direction of the board unit.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction, and in particular to the structural design of temporary positioning components for welded steel box girders. Background Technology

[0002] In China, bridge construction primarily employs three forms: reinforced concrete structures, prestressed concrete structures, and steel structures. With the increasing demand for longer bridge spans, steel structures have gradually become the preferred design solution for long-span bridges due to their unique performance advantages. Among these, steel box girder structures, with their high bending and torsional stiffness, high construction efficiency, and short construction period, are widely used in highway and municipal bridges. In actual engineering projects, due to transportation conditions and site environment limitations, steel box girder bridges typically require segmented fabrication. After the segments arrive on site and are assembled, temporary fixing structures using mounting plates are necessary to ensure precise welding connections. This process not only guarantees the spatial positioning accuracy of the steel box girder segments but also allows for the recycling of construction materials through a detachable design, effectively balancing construction efficiency and cost control requirements.

[0003] Chinese patent document CN217149852U discloses a mounting plate structure and a steel box girder. In this technical solution, the mounting plate structure uses I-beam connecting supports that can slide along the weld direction at the ends of the steel box girder. Combined with tension jacks, adjacent steel box girders are tensioned and adjusted bidirectionally, achieving precise alignment and temporary fixation of the connecting supports. This effectively solves the problem of high positioning accuracy requirements in traditional mounting plate welding, ensuring rapid and accurate alignment of the steel box girder before welding. Stable prestressing is provided by the tension jacks, and the I-beams and steel box girders are connected by detachable threaded rods, significantly improving construction efficiency and positioning reliability.

[0004] However, the aforementioned device presents the following problems in practical applications: its installation process requires the pre-assembly of multiple sets of supporting components, such as I-beams, C-beams, and tension supports, and bidirectional position adjustment via tension jacks. Operation not only necessitates repeated calibration of bolt tightness and jack tension, complicating the process and demanding a high level of skill from operators, but also significantly increases the on-site construction period. Especially in large-scale bridge projects, when multiple sets of tie plates need to be coordinated synchronously, even minute displacement deviations of individual components can trigger a chain reaction, causing a decrease in overall connection accuracy and ultimately hindering construction progress. Utility Model Content

[0005] To overcome the shortcomings of the prior art, a temporary fixing device for welding steel box girders is provided.

[0006] This utility model is achieved through the following technical solution: a temporary fixing device for welding steel box girders, comprising a mounting plate unit welded above the butt joint of two adjacent steel box girders, wherein the mounting plate unit has a first through-weld hole and a second through-weld hole symmetrically opened on both sides along its length direction, and the line connecting the center of the first through-weld hole and the second through-weld hole is perpendicular to the extension direction of the butt joint; the mounting plate unit has a positioning structure for cutting between the first through-weld hole and the second through-weld hole along its length direction.

[0007] In a preferred embodiment of this utility model, the positioning structure is a cutting groove, which is symmetrically opened on both sides of the code plate unit along its length direction.

[0008] In a preferred embodiment of this utility model, the depth of the cutting groove is less than 1 / 2 of the thickness of the code plate unit.

[0009] In a preferred embodiment of the present invention, the positioning structure consists of several line segment grooves arranged along the length direction of the code plate unit, and the line segment grooves are formed on both sides of the code plate unit.

[0010] In a preferred embodiment of this utility model, the code plate unit is provided with V-shaped grooves symmetrically on both sides along its width direction.

[0011] In a preferred embodiment of this utility model, the positioning structure is the connecting line between the tips of two V-shaped grooves.

[0012] In a preferred embodiment of this utility model, the first and second through-weld holes have the same diameter, and the center-to-center distance between the two holes is 1 / 2 to 2 / 3 of the width of the code plate unit.

[0013] In a preferred embodiment of this utility model, there are multiple code plate units, which are spaced apart along the extension direction of the butt joint. Compared with the prior art, this utility model has the following advantages:

[0014] A temporary fixing device for welding steel box girders is disclosed. It features a simple structure and easy operation. The first and second weld holes are symmetrically distributed, and their connection line is perpendicular to the butt joint, ensuring that the mounting plate unit is strictly perpendicular to the weld direction during installation and preventing misalignment of the steel box girder. The positioning structure guides the cutting path, and the complete weld hole structure is retained after cutting, facilitating the recycling and reuse of the mounting plate unit, reducing material waste, and lowering project costs.

[0015] Furthermore, the symmetrically designed cutting grooves ensure that the stress distribution of the plate unit is uniform during cutting, preventing deformation of the plate unit and thus avoiding material waste.

[0016] Furthermore, by limiting the depth of the cutting groove, sufficient bending stiffness is ensured for the code plate unit during welding and fixing.

[0017] Furthermore, the distributed segment slots reduce local stress concentration and prevent the code plate unit from cracking.

[0018] Furthermore, the V-groove serves as a visual alignment mark, improving the cutting efficiency of the code plate unit.

[0019] Furthermore, the connecting lines clearly define the cutting path to ensure a smooth separation surface of the chip unit after cutting; V-grooves are used instead of solid cutting grooves to reduce material consumption.

[0020] Furthermore, the ratio of the spacing between the weld holes to the width of the code board unit is optimized to prevent the code board unit from deforming under external force.

[0021] Furthermore, the multiple plate units are spaced apart to evenly distribute the temporary fixed load; the number of plate units can be flexibly adjusted according to the weld length to adapt to different engineering needs.

[0022] Other features and advantages of this utility model will be disclosed in detail in the following specific embodiments and accompanying drawings. Attached Figure Description

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

[0024] Figure 1 This is a structural schematic diagram of a temporary fixing device for welding steel box girders according to the present invention;

[0025] Figure 2 This is a schematic diagram of the cutting groove structure of this utility model;

[0026] Figure 3 This is a schematic diagram of the line segment groove of this utility model;

[0027] Figure 4 This is a schematic diagram of the V-groove structure of this utility model;

[0028] The annotations in the attached figures are explained as follows:

[0029] 1. Steel box girder, 2. Butt joint, 3. Plate unit, 4. First weld hole, 5. Second weld hole, 6. Positioning structure, 61. Cutting groove, 62. Line segment groove, 63. V-groove. Detailed Implementation

[0030] The technical solutions of the present utility model will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present utility model.

[0031] In the following description, terms such as “inner,” “outer,” “upper,” “lower,” “left,” and “right” are used only to facilitate the description of the embodiments and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0032] like Figures 1 to 4 As shown, a temporary fixing device for welding steel box girders includes a mounting plate unit 3 welded above the joint 2 of two adjacent steel box girders 1. The mounting plate unit 3 is arranged across the joint 2, and its two ends are welded and fixed to the top surface of the steel box girders 1 on both sides of the joint 2. The mounting plate unit 3 has a first through-weld hole 4 and a second through-weld hole 5 symmetrically opened on both sides along its length direction. The line connecting the center of the first through-weld hole 4 and the second through-weld hole 5 is perpendicular to the extension direction of the joint 2. The mounting plate unit 3 has a positioning structure 6 for cutting between the first through-weld hole 4 and the second through-weld hole 5 along its length direction.

[0033] Example 1:

[0034] In the welding project of the steel box girder 1 of a large highway bridge, the temporary fixing device for welding steel box girders provided by this utility model is used. The butt joint 2 of the steel box girder 1 of this bridge has a certain length. In order to ensure accurate welding, several mounting plate units 3 are selected and spaced along the extension direction of the butt joint 2.

[0035] When the mounting plate unit 3 is welded above the joint 2 of two adjacent steel box girders 1, it is installed in strict accordance with the principle that the first through-weld hole 4 and the second through-weld hole 5 are symmetrically distributed and the line connecting them is perpendicular to the joint 2, so as to ensure that the mounting plate unit 3 is strictly perpendicular to the weld direction and effectively avoid misalignment of the steel box girder 1.

[0036] On the code plate unit 3, a cutting groove 61 is formed along its length between the first through-weld hole 4 and the second through-weld hole 5 as a positioning structure 6. In this embodiment, the groove depth of the cutting groove 61 is less than 1 / 2 of the thickness of the code plate unit 3. This ensures both uniform stress distribution in the code plate unit 3 during cutting and sufficient bending stiffness during welding and fixing.

[0037] After welding is completed, the worker cuts along the cutting groove 61. With the guidance of the cutting groove 61, the cutting path is accurate and the complete weld hole structure is retained after cutting, which is convenient for the recycling and reuse of the board unit 3.

[0038] The first through-hole 4 and the second through-hole 5 have the same diameter, and the center distance between the two holes is 1 / 2 to 2 / 3 of the width of the code plate unit 3. This prevents the code plate unit 3 from deforming under external force and ensures the stability and reliability of the code plate unit 3.

[0039] Example 2:

[0040] In another municipal bridge steel box girder welding project, the temporary fixing device of this utility model was also used. The steel box girder 1 of this bridge has a corresponding length at the butt joint 2, and a certain number of mounting plate units 3 are selected for temporary fixing. Unlike Embodiment 1, the mounting plate units 3 in this embodiment use distributed line segment grooves 62 as positioning structures 6. The line segment grooves 62 are arranged along the length direction of the mounting plate unit 3 and are opened on both sides of the mounting plate unit 3. This design reduces local stress concentration and avoids cracking of the mounting plate unit 3 during the cutting process.

[0041] During the welding process, the mounting plate unit 3 effectively serves as a temporary fixation, ensuring precise alignment of the steel box girder 1. After welding, workers cut along the path of the segment groove 62. Due to the distributed design of the segment groove 62, the cutting process is smooth, the separation surface of the mounting plate unit 3 is flat, and the weld hole structure is intact, facilitating subsequent recycling and reuse.

[0042] Example 3:

[0043] In the welding of the steel box girder 1 of a municipal bridge, a mounting plate unit 3 with a V-groove 63 was used. The steel box girder 1 of this bridge has a corresponding length for its butt joint 2, and a certain number of mounting plate units 3 were selected for temporary fixation. The V-groove 63 on the mounting plate unit 3 serves as a visual alignment mark, greatly improving the efficiency of workers during cutting. In the installation process of this embodiment, the positioning structure 6 is the connecting line between the tips of the two V-grooves 63, facilitating quick identification and positioning by workers.

[0044] Before welding, the plate unit 3 is symmetrically distributed with the first weld hole 4 and the second weld hole 5 to ensure it is strictly perpendicular to the weld direction and to prevent misalignment of the steel box girder 1. After welding, the connecting line at the tip of the V-groove 63 is used as the cutting path to ensure the flatness of the separation surface of the plate unit 3 after cutting. At the same time, since the V-groove 63 is different from the cutting groove 61, it reduces the processing difficulty and engineering cost.

[0045] In practical engineering, this temporary fixing device significantly improves construction efficiency and positioning reliability. In a cross-river bridge project, the spaced use of multiple mounting plate units 3 not only ensured the spatial positioning accuracy of the steel box girder segment 1, but also enabled the recycling of construction materials through a detachable design. Compared with existing technologies, it avoids the complex process of assembling multiple sets of components and reduces the on-site construction cycle. The multiple mounting plate units 3 can be flexibly set up to adapt to different projects. Several mounting plate units 3 are distributed along the butt joint 2 to balance the load. Deformation is avoided by adjusting the spacing. Multi-unit collaboration improves construction efficiency.

[0046] Furthermore, the first through-hole 4 and the second through-hole 5 are preferably semi-circular in shape. This facilitates factory processing and cutting, and reduces material waste.

[0047] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the content described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. A temporary fixing device for steel box girder welding, comprising a deck unit (3) welded above the butt joint (2) of two adjacent steel box girders (1), characterized in that: The code plate unit (3) is symmetrically provided with a first through-weld hole (4) and a second through-weld hole (5) on both sides along its length direction. The center line connecting the first through-weld hole (4) and the second through-weld hole (5) is perpendicular to the extension direction of the butt joint (2). The code plate unit (3) is provided with a positioning structure (6) for cutting between the first through-weld hole (4) and the second through-weld hole (5) along its length direction.

2. The temporary fixation device of claim 1, wherein: The positioning structure (6) is a cutting groove (61), which is symmetrically opened on both sides of the code plate unit (3) along its length direction.

3. The temporary fixation device of claim 2, wherein: The depth of the cutting groove (61) is less than 1 / 2 of the thickness of the code plate unit (3).

4. The temporary fixation device of claim 1, wherein: The positioning structure (6) consists of several line segment grooves (62) arranged along the length direction of the code plate unit (3), and the line segment grooves (62) are opened on both sides of the code plate unit (3).

5. The temporary fixing device according to claim 1, characterized in that: The code plate unit (3) is provided with V-shaped grooves (63) symmetrically on both sides along its width direction.

6. The temporary fixing device according to claim 5, characterized in that: The positioning structure (6) is the connecting line between the tips of the two V-grooves (63).

7. The temporary fixing device according to claim 1, characterized in that: The first through-hole (4) and the second through-hole (5) have the same diameter, and the center distance between the two holes is 1 / 2 to 2 / 3 of the width of the code plate unit (3).

8. The temporary fixing device according to claim 1, characterized in that: There are multiple code plate units (3), and the multiple code plate units (3) are spaced apart along the extension direction of the butt joint (2).

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