U-shaped rib supporting plate structure for reducing notch stress of diaphragm plate of steel box girder

Abstract

The utility model provides a U-shaped rib support plate structure for reducing steel box girder diaphragm plate notch stress, which comprises a steel box girder, the steel box girder comprises a steel bridge deck and a plurality of diaphragm plates arranged at intervals along the length direction under the steel bridge deck, the steel bridge deck comprises a cover plate and a U-shaped rib arranged under the cover plate, and the U-shaped rib is arranged on the cover plate. The U-shaped ribs penetrate through the transverse partition plates, cavity notches are formed in the positions, below the U-shaped ribs, of the transverse partition plates, vertical supporting plates are arranged on the transverse partition plates, and the upper ends of the supporting plates abut against the edges of the lower wings of the U-shaped ribs. The device is suitable for fatigue crack repair of connection details of the steel bridge deck and the diaphragm plate of the steel box girder or newly-built bridge design, is reasonable in structural design, convenient to construct, capable of effectively reducing notch stress of the diaphragm plate of the steel box girder, capable of prolonging the service life of the diaphragm plate, simple in later maintenance and low in cost. And the method has good practical value and economic benefit.

Description

Technical Field

[0001] The utility model relates to a U-shaped rib supporting plate structure for reducing the cutout stress of a steel box beam transverse diaphragm. Background Art

[0002] Orthotropic steel bridge decks were a major breakthrough in bridge structure design in the last century. They are widely used in large and medium-span bridges due to their advantages, including light weight, high ultimate load-bearing capacity, short construction period, and wide range of applications. However, steel bridge decks have numerous welds, complex structures, and significant stress concentration effects. Furthermore, under the influence of vehicle cyclic loads and environmental factors, steel bridge decks suffer from fatigue problems, which seriously affect the normal service life of bridge structures and significantly reduce their load-bearing capacity. If reinforcement measures are not taken in a timely manner, structural fractures may occur, and even bridge collapse accidents may occur. Therefore, researchers have conducted extensive research on the repair and reinforcement technologies for fatigue cracks in steel structures, including crack arrest holes, pneumatic impact and ultrasonic hammering, welding steel plates, and CFRP reinforcement.

[0003] Fatigue cracks at the diaphragm cutouts in orthotropic steel bridge decks are a significant concern, as they severely impact the durability and safety of the bridge structure. A new technology for addressing fatigue cracks at the diaphragm cutouts is to place one side of an equilateral angle steel against the diaphragm, and the other side of the equilateral angle steel against the lower flange of the U-shaped rib, and bolt the equilateral angle steel to both the diaphragm and the U-shaped rib simultaneously. While this reinforcement method reduces some of the stress at the diaphragm cutouts, the angle steel constrains the rotational deformation of the U-rib, which can lead to new fatigue cracks and fails to achieve the goal of suppressing crack propagation and extending the service life of the steel box girder. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a U-shaped rib support plate structure for reducing the cut stress of the steel box girder cross-plate. The structure is reasonable, the construction is convenient, and the quality is easy to ensure. It can effectively reduce the cut stress of the steel box girder cross-plate, increase the service life of the cross-plate, and is simple to maintain in the later stage. It has good practical value and economic benefits.

[0005] The present invention is implemented by the following scheme: a U-shaped rib support plate structure for reducing the cut stress of the transverse diaphragm of a steel box girder, comprising a steel box girder, wherein the steel box girder comprises a steel bridge deck and a plurality of transverse diaphragms spaced apart along the length direction under the steel bridge deck, wherein the steel bridge deck comprises a cover plate and a U-shaped rib arranged under the cover plate, wherein the U-shaped rib passes through each transverse diaphragm, and a hollow cut is arranged on the transverse diaphragm under the U-shaped rib: a vertical support plate is arranged on the transverse diaphragm, and the upper end of the support plate abuts against the lower wing edge of the U-shaped rib.

[0006] Preferably, the lower surface of the support plate is fixed to the transverse partition by a plurality of bolts and nuts and is below the hollow cutout. Mounting holes are provided on the support plate corresponding to the bolts, and fixing holes are provided on the transverse partition corresponding to the bolts.

[0007] Furthermore, the mounting hole is a vertical long guide hole or a circular hole.

[0008] Preferably, the lower surface of the support plate is welded to the diaphragm and below the hollow cutout.

[0009] Furthermore, the cross section of the upper edge of the support plate is arc-shaped.

[0010] Preferably, a round steel bar is welded to the upper edge of the support plate along the length direction, and the round steel bar abuts against the U-shaped rib.

[0011] Furthermore, the support plate is rectangular or trapezoidal.

[0012] Furthermore, the support plate is trapezoidal, with the short side of the support plate at the top and the long side at the bottom, and the short side of the support plate abuts against the lower wing edge of the U-shaped rib.

[0013] Preferably, the support plate is arranged in the hollow cutout and is formed integrally with the hollow cutout, and an inner partition is provided in the U-shaped rib corresponding to the transverse partition.

[0014] Furthermore, a rubber sleeve is provided on the upper end of the support plate, and the rubber sleeve abuts against the edge of the lower wing of the U-shaped rib.

[0015] Compared with the existing technology, the utility model has the following beneficial effects: it is suitable for the fatigue crack repair of the connection details of the steel box girder steel bridge deck and the diaphragm or the design of new bridges, has a reasonable structural design, convenient construction, and easy quality assurance. It can effectively reduce the cut stress of the steel box girder diaphragm, increase the service life of the diaphragm, and is simple to maintain in the later stage, with good practical value and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of Example 1 of the present utility model;

[0017] Figure 2 This is a side structural diagram of Example 1 of the present utility model;

[0018] Figure 3 This is a schematic structural diagram of Example 2 of the present utility model;

[0019] Figure 4 This is a side structural diagram of Example 3 of the present utility model;

[0020] Figure 5 This is a schematic structural diagram of Example 4 of the present utility model;

[0021] Figure 6 This is a side structural diagram of Example 4 of the present utility model;

[0022] Figure 7 This is a schematic diagram of the rubber sleeve structure of Example 4 of the present utility model.

[0023] In the figure: 1—U-shaped rib; 2—support plate; 201—mounting hole; 3—cross partition; 4—bolt; 5—round steel rod; 6—inner partition; 7—rubber sleeve. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0026] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0027] Example 1: Figure 1-2 As shown, a U-shaped rib support plate structure for reducing the stress of the cross-diaphragm cutting of a steel box girder comprises a steel box girder, the steel box girder comprises a steel bridge deck and a plurality of cross-diaphragms arranged at intervals along the length direction under the steel bridge deck, the steel bridge deck comprises a cover plate and U-shaped ribs arranged under the cover plate, the U-shaped ribs pass through each cross-diaphragm, the U-shaped ribs and the cross-diaphragms intersect, preferably, the U-shaped ribs and the cross-diaphragms are perpendicular to each other, a slot for the U-shaped rib to pass through is provided on the cross-diaphragm according to the contour of the U-shaped rib, a hollow cut is provided on the cross-diaphragm under the U-shaped rib, the lower wing edge of the U-shaped rib passes through the hollow cut, a vertical support plate is provided on the cross-diaphragm, and the upper end of the support plate abuts against the lower wing edge of the U-shaped rib.

[0028] In this embodiment, in order to achieve the fixation of the support plate, the lower plate surface of the support plate is locked to the transverse partition by a number of bolts and nuts and under the hollow cutout. Mounting holes are opened on the support plate corresponding to the bolts, and fixing holes are opened on the transverse partition corresponding to the bolts. The bolts pass through the corresponding mounting holes and fixing holes, and then are locked by the bolts to achieve the fixation of the support plate. The bolts can be existing high-strength bolts.

[0029] In this embodiment, the mounting hole is a vertical long guide hole or a conventional round hole. It is preferred to use a vertical long guide hole so that the support plate can be attached to the side of the transverse partition and slide up and down to the lower flange of the top U-shaped rib, so as to facilitate the adjustment of the position of the support plate as needed.

[0030] In this embodiment, the cross section of the upper edge of the support plate is arc-shaped, which facilitates the abutment between the support plate and the edge of the lower wing of the U-shaped rib.

[0031] In this embodiment, the support plate is rectangular or trapezoidal, and the support plate is trapezoidal, with the short side of the support plate at the top and the long side at the bottom. The short side of the support plate abuts against the edge of the lower wing of the U-shaped rib. Specifically, the width of the short side is 10~30mm longer than the width of the straight section of the lower flange of the U-shaped rib.

[0032] Example 2: Figure 3 As described above, compared with Example 1, in order to increase the construction speed and avoid the drilling process, the connection between the support plate and the diaphragm is in the form of welding. Since the other structures are the same as those in Example 1, they will not be described in detail. Specifically, the lower plate surface of the support plate is welded to the diaphragm and below the hollow cut, that is, the lower plate surface of the support plate is welded to the surface of the diaphragm below the hollow cut, thereby achieving quick connection.

[0033] Example 3: Figure 4 As described above, compared with Examples 1 and 2, in order to reduce the internal force generated by limiting the slight deformation of the U-shaped rib along the bridge direction, a round steel bar is added to the upper edge of the support plate. Since the other structures are the same as those in Example 1 or 2, they will not be described in detail. Specifically, the upper edge of the support plate is welded with a round steel bar along the length direction, that is, the upper edge of the support plate is parallel to the length direction of the round steel bar, and the upper edge of the support plate is welded to the outer wall of the round steel bar, and the round steel bar is abutted against the U-shaped rib. Through this, the round steel bar can support the U-shaped rib without limiting the slight deformation of the U-shaped rib along the bridge direction, thereby avoiding the generation of internal force.

[0034] Example 4: Figure 5-7 As described above, compared with the above three embodiments, this embodiment is applicable to newly built bridge structures, that is, the supporting steel plate is a part of the diaphragm and is formed synchronously with the hollow incision. Since other structures are the same as those in Embodiments 1, 2 or 3, they will not be described in detail. Specifically, the supporting plate is arranged in the hollow incision and is integrally formed with the hollow incision, that is, the supporting plate is a part of the diaphragm and is formed by the diaphragm incision. The upper end of the supporting plate is supported on the bottom of the lower flange of the U-shaped rib, and the two are only in contact but not fixed. The lower end of the supporting steel plate is connected to the lower edge of the hollow incision.

[0035] In this embodiment, a rubber sleeve is provided on the upper end of the support plate, and the rubber sleeve abuts against the edge of the lower wing of the U-shaped rib. The upper end of the rubber sleeve can be an arc-shaped cross-section. The support plates of the other three embodiments mentioned above can also be provided with rubber sleeves.

[0036] In this embodiment, in order to effectively improve the out-of-plane stiffness of the U-shaped rib, make the stress evenly distributed, and further reduce the stress of the diaphragm cut, an inner baffle is provided in the U-shaped rib corresponding to the diaphragm, that is, an inner baffle is provided in the U-shaped rib at the intersection of the U-shaped rib and the diaphragm, and the installation range of the inner baffle is within the thickness of the diaphragm. Since in this embodiment, the diaphragm and the support plate are integrated and are in the same plane, the inner baffle transmits force to the support plate, avoiding damage to the inner baffle and extending the service life of the structure. Specifically, the thickness of the inner baffle differs from the thickness of the diaphragm by 0~6mm.

[0037] The construction steps of this embodiment are:

[0038] Step 1: Prefabricate the transverse diaphragm, support plate and inner diaphragm, wherein the support plate is a part of the transverse diaphragm and is formed by the cutout of the transverse diaphragm;

[0039] Step 2: Install the inner partition on the U-shaped rib at the corresponding position of the support plate. The thickness of the inner partition should be 0~6mm thicker than that of the support plate.

[0040] Step 3: Assemble the steel bridge deck and install the diaphragms in the corresponding positions; at this time, the inner diaphragms are located within the thickness of the support plates;

[0041] Step 4: Measure the distance between the support plate and the lower flange of the U-shaped rib;

[0042] Step 5: Select a rubber sleeve of corresponding thickness and install it on the upper end of the support plate. The rubber sleeve should be arc-shaped along the bridge direction. The lower end of the rubber sleeve can be fixed to the top of the support plate, and the upper end of the rubber sleeve should be against the lower flange of the U-shaped rib.

[0043] Unless otherwise stated, any numerical range disclosed for any technical solution disclosed in the present invention is a preferred numerical range. Those skilled in the art should understand that a preferred numerical range is merely a numerical range that provides a more significant or representative technical effect among a wide range of practicable values. Due to the large number of numerical values, it is impossible to enumerate them exhaustively. Therefore, only some numerical values ​​are disclosed in the present invention to illustrate the technical solution of the present invention. Furthermore, the numerical values ​​listed above should not be construed as limiting the scope of protection of the present invention.

[0044] If words such as "first" and "second" are used in this document to limit components, those skilled in the art should know that the use of "first" and "second" is only for the convenience of description to distinguish between components. Unless otherwise stated, the above words have no special meaning.

[0045] If the present invention discloses or involves components or structural parts that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connection using bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by integral molding using a casting process) (except where it is obviously not possible to use an integrated molding process).

[0046] In addition, the orientations or positional relationships indicated by terms such as "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", and "outside" used in any of the technical solutions disclosed in the above-mentioned utility model are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this patent, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this patent. Unless otherwise stated, the terms used to indicate shapes used in any of the technical solutions disclosed in the above-mentioned utility model include shapes that are approximate, similar, or close to them.

[0047] Any component provided by the present invention may be assembled from a plurality of separate components, or may be a separate component manufactured by an integral forming process.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and not to limit it; although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents; without departing from the spirit of the technical solution of the utility model, they should all be included in the scope of the technical solution for which protection is requested in the utility model.

Claims

1. A U-shaped rib support plate structure for reducing the stress of the cross-diaphragm cutout of a steel box girder, comprising a steel box girder, the steel box girder including a steel bridge deck and a plurality of cross-diaphragms spaced along the length thereof below the steel bridge deck, the steel bridge deck including a cover plate and U-shaped ribs disposed below the cover plate, the U-shaped ribs extending through each cross-diaphragm, the cross-diaphragms having hollow cutouts below the U-shaped ribs, characterized in that: A vertical support plate is provided on the transverse partition, and the upper end of the support plate abuts against the edge of the lower wing of the U-shaped rib.

2. The U-shaped rib support plate structure according to claim 1, characterized in that: The lower plate surface of the support plate is locked on the transverse partition and below the hollow cutout by a plurality of bolts and nuts. Mounting holes are provided on the support plate corresponding to the bolts, and fixing holes are provided on the transverse partition corresponding to the bolts.

3. The U-shaped rib support plate structure according to claim 2, characterized in that: The mounting hole is a vertical long guide hole or a round hole.

4. The U-shaped rib support plate structure according to claim 1, characterized in that: The lower plate surface of the support plate is welded to the transverse partition and below the hollow cutout.

5. The U-shaped rib support plate structure according to any one of claims 2 to 4, characterized in that: The cross section of the upper edge of the support plate is arc-shaped.

6. The U-shaped rib support plate structure according to any one of claims 2 to 4, characterized in that: A round steel bar is welded to the upper edge of the support plate along the length direction, and the round steel bar abuts against the U-shaped rib.

7. The U-shaped rib support plate structure according to any one of claims 2 to 4, characterized in that: The supporting plate is rectangular or trapezoidal.

8. The U-shaped rib support plate structure according to claim 7, characterized in that: The support plate is trapezoidal, with the short side of the support plate at the top and the long side at the bottom, and the short side of the support plate abuts against the edge of the lower wing of the U-shaped rib.

9. The U-shaped rib support plate structure according to claim 1, characterized in that: The support plate is arranged in the hollow cutout and is integrally formed with the hollow cutout, and an inner partition is arranged in the U-shaped rib corresponding to the transverse partition.

10. The U-shaped rib support plate structure according to claim 9, characterized in that: A rubber sleeve is sleeved on the upper end of the support plate, and the rubber sleeve abuts against the edge of the lower wing of the U-shaped rib.

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