A steel plate girder bridge splicing structure

Abstract

The utility model relates to the technical field of flexible photovoltaic support and bridge engineering steel structure, disclose a kind of steel plate girder bridge splicing structure, bolt passes through the pre-set hole of first web plate and second web plate, can be directly realized the axial and radial positioning of first web plate and second web plate when splicing, avoid the misplacement problem caused by traditional process depending on manual alignment.Compared with full bolt connection, bolt positioning can reduce the amount of bolt, avoid the problems such as bolt loosening, corrosion, fatigue failure;Compared with one-way welding, without relying on high-difficulty field welding, avoid the problems such as welding deformation and low connection strength, and bolt positioning can assist welding, improve welding accuracy, indirectly improve welding quality.

Description

Technical Field

[0001] This utility model relates to the field of steel structure technology for bridge engineering, and in particular to a splicing structure for steel plate girder bridges. Background Technology

[0002] Steel plate girder bridges are a common form of modern bridge construction, suitable for small and medium span bridges, and are characterized by simple structure, high load-bearing capacity, and large span.

[0003] Due to transportation limitations, steel plate girder bridges are mainly fabricated in sections at the factory and transported to the construction site. The installation site environment is complex, and processing conditions are limited, making it impossible to guarantee welding quality. This often results in substandard welding quality and bridge deformation.

[0004] The conventional splicing processes for steel plate beams mainly include full bolt connection and one-way welding. Full bolt connection has problems such as bolt loosening, corrosion, fatigue failure, difficulty in repairing the connectors, and weakening of the cross section; one-way welding process has problems such as poor splicing accuracy, low connection strength, and welding deformation.

[0005] On-site splicing mainly relies on manual alignment and leveling. Due to construction limitations, traditional methods are prone to problems such as misalignment and deformation, making it impossible to guarantee quality and directly affecting bridge safety. Utility Model Content

[0006] This utility model aims to provide a steel plate girder bridge splicing structure to solve the technical problems of bolt loosening, corrosion, fatigue failure, difficulty in repairing connectors, cross-sectional weakening, and poor splicing accuracy, low connection strength, and welding deformation in the existing all-bolted connection.

[0007] The technical problem solved by this utility model embodiment is addressed by the following technical solution:

[0008] A steel plate girder bridge splicing structure is provided, comprising:

[0009] Top slab of main beam;

[0010] First web plate;

[0011] Second ventral plate;

[0012] The main beam bottom plate, the first web plate, the second web plate, the top plate and the main beam bottom plate are arranged in an I-shaped structure;

[0013] A pin can be passed through the first web and the second web in sequence to fix and position the first web and the second web.

[0014] In some embodiments, a transverse diaphragm is further included, which is vertically disposed at the bottom of the top plate of the main beam.

[0015] In some embodiments, positioning plates are provided on both sides of the first web plate, and positioning holes are pre-set on the positioning plates;

[0016] A positioning hole is provided on the second web plate;

[0017] The first web and the second web can be fixedly positioned by passing pins sequentially through the positioning holes on the positioning plate and the positioning holes on the second web.

[0018] In some embodiments, the positioning plate is welded to the first web plate.

[0019] In some embodiments, the positioning plate has three positioning holes and the second web plate has three positioning holes to increase the connection strength between the first web plate and the second web plate.

[0020] The positioning holes of the positioning plate and the positioning holes of the second web plate are both arranged in a triangular shape.

[0021] In some embodiments, the thickness of the main beam top plate, main beam bottom plate, first web plate and second web plate is not less than 16mm, and the joints are staggered by more than 200mm.

[0022] Compared with existing technologies, in the steel plate girder bridge splicing structure provided in this embodiment of the utility model, the pins pass through the pre-set holes in the first and second webs, which can directly achieve axial and radial positioning of the first and second webs during splicing, avoiding the misalignment problem caused by manual alignment in traditional processes. In addition, pin positioning does not require complex welding equipment or high-precision processing. Under conditions of limited construction site environment (such as poor processing conditions and difficulty in ensuring welding quality), splicing can be completed quickly through mechanical positioning, shortening the construction cycle.

[0023] Compared to fully bolted connections, pin positioning can reduce the number of bolts used, avoid problems such as bolt loosening, corrosion, and fatigue failure, and at the same time reduce the degree of cross-sectional weakening (bolt holes will weaken the strength of the first and second web plates).

[0024] Compared to unidirectional welding, it eliminates the need for complex on-site welding, avoiding issues such as welding deformation and low connection strength. Furthermore, the pin positioning can assist welding, improve welding precision, and indirectly improve welding quality. Attached Figure Description

[0025] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the drawings in the drawings are not to be limited by scale.

[0026] Figure 1 This is a plan view of the steel plate beam bridge splicing structure provided by this utility model;

[0027] Figure 2 This is a structural schematic diagram of the steel plate beam bridge splicing structure provided by this utility model;

[0028] Figure 3 This is a schematic diagram of the pin structure of the steel plate beam bridge splicing structure provided by this utility model.

[0029] Marked in the image:

[0030] 100. Steel plate girder bridge splicing structure; 10. Main girder top plate; 11. Transverse diaphragm; 12. First web plate; 13. Main girder bottom plate; 14. Second web plate; 21. Positioning plate; 22. Pin; 23. Dowel pin; 31. Positioning hole; 20. Weld. Detailed Implementation

[0031] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as "connected" to another element, it can be directly on the other element, or one or more intermediate elements may exist between them. The terms "upper," "lower," "left," "right," "upper end," "lower end," "top," and "bottom," etc., used in this specification, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not 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. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention.

[0033] The following is combined with Figures 1 to 3 The steel plate girder bridge splicing structure 100 provided in this application will be described in detail through specific embodiments.

[0034] Please refer to the following: Figures 1 to 3 , Figure 1 This is a plan view of the steel plate beam bridge splicing structure provided by this utility model; Figure 2 This is a structural schematic diagram of the steel plate beam bridge splicing structure provided by this utility model; Figure 3This is a schematic diagram of the pin structure of the steel plate girder bridge splicing structure provided by this utility model. One embodiment of the steel plate girder bridge splicing structure 100 provided by this utility model includes a main girder top plate 10, a first web plate 12, a second web plate 14, and a main girder bottom plate 13. The first web plate 12, the second web plate 14, the top plate, and the main girder bottom plate 13 are arranged in an I-shape; the pins 22 can pass sequentially through the first web plate 12 and the second web plate 14 to fix and position them.

[0035] The top plate 10 and bottom plate 13 of the main beam bear the positive and negative bending moments of the bridge. They are welded with the first web plate and the second web plate 14 to form an I-shaped section, providing bending stiffness.

[0036] The first web 12 and the second web 14 primarily bear shear force, forming a continuous shear-resistant surface after being spliced ​​together by pins 22. Pins 22 pass through pre-drilled holes in the first web 12 and the second web 14 (the hole diameter is 1-2 mm larger than the pin 22), restricting the lateral and longitudinal displacement of the webs. Under load, pins 22 transmit shear force through bearing and shear resistance, avoiding the slippage problem caused by preload loosening in traditional bolt groups. Mechanical alignment and leveling are achieved through the collaborative mechanism of the positioning plate 21 and the pins 22, improving the on-site welding accuracy and structural strength of the steel beam.

[0037] The pin 22 passes through the pre-drilled holes in the first web 12 and the second web 14, enabling direct axial and radial positioning of the first web 12 and the second web 14 during splicing, avoiding misalignment problems caused by manual alignment in traditional processes. Furthermore, the pin 22 positioning eliminates the need for complex welding equipment or high-precision machining. In situations with limited on-site conditions (such as poor machining conditions or difficulty in guaranteeing welding quality), mechanical positioning can quickly complete the splicing, shortening the construction cycle.

[0038] Compared to a fully bolted connection, the pin 22 positioning reduces the amount of bolts used, avoiding problems such as bolt loosening, corrosion, and fatigue failure, while also reducing the degree of cross-sectional weakening (bolt holes weaken the strength of the first web 12 and the second web 14).

[0039] Compared to unidirectional welding, it eliminates the need for complex on-site welding, avoiding issues such as welding deformation and low connection strength. Furthermore, the positioning pin 22 can assist in welding, improving welding precision and indirectly enhancing welding quality.

[0040] In some embodiments, a diaphragm 11 is also included, which is vertically disposed at the bottom of the main beam top plate 10.

[0041] The diaphragm 11 can limit the local buckling of the first web 12 and the second web 14: when the height of the first web 12 and the second web 14 is large, the unsupported first web 12 and the second web 14 are prone to wavy buckling under compressive stress. The diaphragm 11 reduces the calculated height of the first web 12 and the second web 14 by providing lateral constraints, thereby increasing the critical buckling stress.

[0042] The vertical setting of the diaphragm 11 provides a lateral positioning benchmark for on-site splicing: during installation, the flatness of the diaphragm 11 can be used to calibrate the levelness of the main beam top plate 10, avoiding misalignment during splicing. The connection holes of the diaphragm 11 with the first web 12 and the second web 14 can serve as auxiliary marks for the positioning of the pins 22, further reducing splicing errors. Furthermore, during the segmental hoisting and splicing of the bridge, the diaphragm 11 can serve as a temporary support point, working in conjunction with the pins 22 for positioning, ensuring the stability of the segmented beams before welding or final fixing, reducing the risk of overturning during construction.

[0043] In some embodiments, positioning plates 21 are provided on both sides of the first web plate 12, and positioning holes 31 are pre-set on the positioning plates 21; and positioning holes 31 are opened on the second web plate 14; the first web plate 12 and the second web plate 14 can be fixedly positioned by passing pins 22 sequentially through the positioning holes 31 of the positioning plates 21 and the positioning holes 31 of the second web plate 14.

[0044] The positioning holes 31 on the positioning plate 21 and the positioning holes 31 on the second web plate 14 are precisely machined during factory prefabrication. During on-site assembly, the pins 22 are directly inserted into the holes, avoiding errors caused by manual alignment. The positioning plates 21 are set on both sides of the first web plate 12 (symmetrically arranged), forming a three-dimensional positioning system of "lateral + longitudinal + vertical" together with the transverse diaphragm 11 (vertical direction): the positioning plates 21 on both sides can limit the lateral displacement of the web plate; the positioning holes 31 and the pins 22 can limit the front and rear displacement; the transverse diaphragm 11 can assist in calibrating the vertical height.

[0045] The weld seam between the positioning plate 21 and the web plate can be treated with anti-corrosion measures at the factory (such as applying an epoxy coating), which is more reliable than the anti-corrosion quality of on-site welding; the edge of the pin 22 hole can be chamfered to reduce stress concentration and reduce the possibility of rust initiation.

[0046] After the pin 22 passes through the positioning hole 31 of the positioning plate 21 and the positioning hole 31 of the second web plate 14, the pin 22 can be locked by the pin 23.

[0047] In some embodiments, the positioning plate 21 is welded to the first web plate 12. The welded connection fixes the positioning plate 21 and the first web plate 12 as a whole, avoiding the loosening problems that may occur with bolted connections.

[0048] In some embodiments, the positioning plate 21 has three positioning holes 31 and the second web plate 14 has three positioning holes 31 to increase the connection strength between the first web plate 12 and the second web plate 14; wherein, the positioning holes 31 and the positioning holes 31 are all triangularly arranged.

[0049] The three pins 22 share the shear force, preventing localized damage caused by load concentration during single-hole or double-hole positioning. During installation, the three positioning holes 31 must be aligned simultaneously before the pins 22 can be inserted, forming a "forced alignment" mechanism: if there is an angular deviation (e.g., ±1°) between the first web plate 12 and the second web plate 14, double-hole positioning may be misjudged as "aligned," while triple-hole positioning will promptly detect the problem if the third hole cannot be inserted with the pin 22, thus avoiding incorrect installation.

[0050] In some embodiments, the thickness of the main beam top plate 10, the main beam bottom plate 13, the first web plate 12 and the second web plate 14 is not less than 16 mm, and the joints are staggered by more than 200 mm.

[0051] In some embodiments, the main beam top plate 10, the first web plate 12, the second web plate 14, and the main beam bottom plate 13 are all connected by double-sided full welding through weld 20. The weld is a Class I weld with a height of not less than 8mm, and the plate corners are rounded to R20mm to avoid weld interference and improve welding quality and aesthetics.

[0052] It should be noted that the steel plate girder bridge splicing structure 100 provided in this embodiment of the present invention only shows the part related to the technical problem to be solved by this embodiment of the present invention. It can be understood that the steel plate girder bridge splicing structure 100 provided in this embodiment of the present invention also includes other structures for realizing the function of the steel plate girder bridge splicing structure 100, which will not be described in detail here.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; under the concept of this utility model, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this utility model as described above. For the sake of brevity, they are not provided in detail; although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A steel plate girder bridge splicing structure, characterized in that, include: Top slab of main beam; First web plate; Second ventral plate; The main beam bottom plate, the first web plate, the second web plate, the top plate and the main beam bottom plate are arranged in an I-shaped structure; A pin can be passed through the first web and the second web in sequence to fix and position the first web and the second web.

2. The steel plate girder bridge splicing structure according to claim 1, characterized in that, It also includes a transverse diaphragm, which is vertically disposed at the bottom of the top plate of the main beam.

3. The steel plate girder bridge splicing structure according to claim 2, characterized in that, Positioning plates are provided on both sides of the first web plate, and positioning holes are pre-set on the positioning plates; A positioning hole is provided on the second web plate; The first web and the second web can be fixedly positioned by passing pins sequentially through the positioning holes on the positioning plate and the positioning holes on the second web.

4. The steel plate girder bridge splicing structure according to claim 3, characterized in that, The positioning plate is welded to the first web plate.

5. The steel plate girder bridge splicing structure according to claim 4, characterized in that, The positioning plate has three positioning holes, and the second web plate has three positioning holes to increase the connection strength between the first web plate and the second web plate. The positioning holes of the positioning plate and the positioning holes of the second web plate are both arranged in a triangular shape.

6. The steel plate girder bridge splicing structure according to claim 5, characterized in that, The thickness of the main beam top plate, main beam bottom plate, first web plate and second web plate shall not be less than 16mm, and the joints shall be staggered by more than 200mm.

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