U-shaped rib inner partition plate structure for reducing stress in notch area of transverse partition plate of steel box girder

Abstract

The U-shaped rib inner partition plate structure used for reducing the stress of the steel box girder transverse partition plate notch area comprises a steel box girder, the steel box girder comprises a steel bridge deck and a plurality of transverse partition plates arranged below the steel bridge deck at intervals, the steel bridge deck comprises a cover plate and a U-shaped rib arranged below the cover plate, the U-shaped rib penetrates through the transverse partition plates, and the U-shaped rib penetrates through the transverse partition plates. An inner partition plate is arranged in the U-shaped rib and corresponds to the transverse partition plate, the inner partition plate comprises a vertical partition plate, an end plate is arranged on the edge of the vertical partition plate, the vertical partition plate is fixed in the U-shaped rib through the end plate, and the top end of the inner partition plate is supported on the lower surface of the cover plate. The structure 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, and is reasonable in structure, 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 inner diaphragm structure for reducing stress in a cutout area of ​​a steel box beam transverse diaphragm. Background Art

[0002] Orthotropic steel bridge decks are widely used in large and medium-span bridges due to their advantages, including light weight, high load-bearing capacity, short construction periods, excellent durability, and easy maintenance. However, steel bridge decks have numerous welds, complex structures, and significant stress concentration effects. Furthermore, under the influence of cyclic vehicle loads and environmental factors, steel bridge deck fatigue is a serious problem, seriously affecting the normal service life of the bridge structure and significantly reducing the bridge's load-bearing capacity. If reinforcement measures are not implemented in a timely manner, it can cause structural fractures and even lead to bridge collapse.

[0003] Fatigue cracks at the diaphragm cutouts in orthotropic steel bridge decks are an important issue that requires attention, as they seriously affect the durability and safety of the bridge structure. Existing researchers have conducted extensive research on the repair and reinforcement techniques for fatigue cracks at diaphragm cutouts, including the crack arrest hole method, the welded steel plate method, and the CFRP bonding reinforcement method. One of the methods is to set an inner diaphragm on the inner side of the U-shaped rib at the intersection of the U-shaped rib and the diaphragm. The contour of the inner diaphragm is U-shaped and can fit tightly with the U-shaped rib. This method can effectively reduce the stress of the diaphragm cutout, but due to the unreasonable structural design of the inner diaphragm, the damage mode is transferred to the damage of the inner diaphragm, resulting in the initiation of new fatigue cracks, which cannot effectively achieve the purpose 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 inner diaphragm structure for reducing the stress in the cut area of ​​the steel box girder diaphragm, which is suitable for fatigue crack repair of the connection details between the steel box girder steel bridge deck and the diaphragm or the design of new bridges. The structure is reasonable, the construction is convenient, the quality is easy to ensure, and it can effectively reduce the cut stress of the steel box girder diaphragm, improve the service life of the diaphragm, and the subsequent maintenance is simple, with good practical value and economic benefits.

[0005] The present invention is implemented by the following scheme: a U-shaped rib inner diaphragm structure for reducing the stress in the cutout area of ​​the transverse diaphragm of a steel box girder, comprising a steel box girder, the steel box girder comprising a steel bridge deck and a plurality of transverse diaphragms spaced along the length direction under the steel bridge deck, the steel bridge deck comprising a cover plate and a U-shaped rib arranged under the cover plate, the U-shaped rib passing through each transverse diaphragm, a hollow cutout is provided on the transverse diaphragm under the U-shaped rib, and the lower flange of the U-shaped rib passes through the hollow cutout: an inner diaphragm is provided in the U-shaped rib corresponding to the transverse diaphragm, the inner diaphragm comprises a vertical diaphragm, the edge of the vertical diaphragm is provided with an end plate, the vertical diaphragm is fixed in the U-shaped rib through the end plate, and the top end of the inner diaphragm is supported on the lower surface of the cover plate.

[0006] Furthermore, the vertical partition is a trapezoid arranged corresponding to the U-shaped rib, with the short side of the vertical partition at the bottom and the long side at the top, and arc-shaped notches are arranged at the four corners of the vertical partition.

[0007] Furthermore, the end plate includes two side end plates, which are installed on the left and right ends of the vertical partition corresponding to the inner side of the U-shaped rib web of the side end plate, and the side end plates are spot welded to the end plate edges on the inner side of the corresponding U-shaped rib web.

[0008] Furthermore, the height of the lower end of the side end plate is at least twice the thickness of the U-shaped rib plate lower than the upper edge of the cavity cutout.

[0009] Furthermore, the end plate includes a bottom end plate, which is installed on the lower end of the vertical partition corresponding to the inner side of the lower flange of the U-shaped rib, and the bottom end plate is spot welded to the edge of the end plate on the inner side of the lower flange of the U-shaped rib.

[0010] Furthermore, the end plate includes a top plate, and the top plate is installed on the upper end of the vertical partition corresponding to the cover plate.

[0011] Furthermore, an arc-shaped inner recess is provided in the middle of the lower portion of the vertical partition, and a hole is formed between the arc-shaped inner recess and the inner side of the lower flange of the U-shaped rib.

[0012] Furthermore, the vertical partition is a cross-shaped plate, the upper limb of the cross-shaped plate abuts against the bottom of the cover plate, the left and right side limbs of the cross-shaped plate abut against the inner side of the corresponding U-shaped rib web, and the lower limb of the cross-shaped plate is fixed on the inner side of the lower flange of the U-shaped rib.

[0013] Furthermore, a vertical support plate is fixed on one side of the transverse partition, and the upper end of the support plate is in contact with the lower flange of the U-shaped rib.

[0014] Furthermore, the lower plate body of the support plate is screwed to the diaphragm and below the hollow cutout by means of bolts and nuts.

[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 a new bridge. The structure is reasonable, the construction is convenient, the quality is easy to ensure, and it can effectively reduce the cut stress of the steel box girder diaphragm, increase the service life of the diaphragm, and the subsequent maintenance is simple, 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; Figure 2 This is a side structural diagram of Example 1 of the present utility model; Figure 3 This is a schematic diagram of the inner partition structure of Example 1 of the present utility model; Figure 4 This is a schematic structural diagram of Example 2 of the present utility model; Figure 5 This is a side structural diagram of Example 2 of the present utility model; Figure 6 This is a schematic structural diagram of Example 3 of the present utility model; Figure 7 This is a side structural diagram of Example 3 of the present utility model.

[0017] Figure 8 This is a schematic structural diagram of Example 4 of the present utility model.

[0018] In the figure: 1—U-shaped rib; 11—U-shaped rib lower flange plate; 12—U-shaped rib web plate; 3—transverse partition; 31—hollow cutout; 4—inner partition; 41—vertical partition; 42—end plate; 411—arc-shaped notch; 421—bottom end plate; 422—side end plate; 423—top end plate; 5—support plate; 6—bolt; 7—cover plate. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] 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.

[0021] 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.

[0022] Example 1: Figure 1-3The U-shaped ribs are connected to the cross-plates of the steel box girder so that the cross-plates can pass through the U-shaped ribs, and the U-shaped ribs can pass through the cross-plates. The bottom of the plate is connected to a bottom end plate, and the bottom end plate is fixed to the inner side of the lower flange of the U-shaped rib, and the left and right sides of the inner partition are fixed to the inner side of the corresponding U-shaped rib web. The specific structure of the inner partition is: an inner partition is provided in the U-shaped rib corresponding to the transverse partition, and the inner partition includes a vertical partition, and the edge of the vertical partition is provided with an end plate, and the angles between the end plate and the vertical partition are 90 degrees. The vertical partition is fixed in the U-shaped rib through the end plate, and the top of the inner partition is supported on the lower surface of the cover plate. More specifically, the vertical partition is a trapezoid corresponding to the U-shaped rib, with the short side of the vertical partition at the bottom and the long side at the top, and the four corners of the vertical partition are provided with arc-shaped notches.

[0023] In this example, the end plate includes two side end plates, which are installed on the left and right ends of the vertical partition corresponding to the inner side of the U-shaped rib web of the side end plate, and the side end plates are spot welded to the end plate edges on the inner side of the corresponding U-shaped rib web.

[0024] In this embodiment, the edge of the lower wing of the U-shaped rib passes through the hollow cut, so part of the bottom area of ​​the U-shaped rib intersects with the hollow cut, so that the U-shaped rib occupies part of the top area of ​​the hollow cut, so the height of the lower end of the side end plate should be lower than the upper edge of the hollow cut by at least 2 times the thickness of the U-shaped rib plate. At the same time, for a reasonable design, the transverse width of the bottom end plate is smaller than the horizontal section width of the lower flange of the U-shaped rib.

[0025] In this example, the end plate further includes a bottom end plate, which is mounted on the lower end of the vertical partition corresponding to the inner side of the lower flange of the U-shaped rib, and the bottom end plate is spot welded to the edge of the end plate on the inner side of the lower flange of the U-shaped rib.

[0026] In this embodiment, the thickness of the inner partition and the thickness of the transverse partition are not more than 6 mm, that is, the thickness of the vertical partition and the thickness of the transverse partition are not more than 6 mm.

[0027] In this embodiment, the structure of this embodiment is applicable to a newly built steel box girder structure, and the specific construction steps are as follows:

[0028] 1) Processing of steel box girder components: CNC cutting machines are used to precisely cut the steel plates to obtain the required shapes and sizes of U-shaped ribs and steel bridge deck cover parts, and the U-shaped ribs are produced through roll forming or bending processes;

[0029] 2) Processing of inner partitions: according to the inner dimensions of the U-shaped ribs, cut the vertical partitions and end plate parts, weld the end plates and vertical partitions, and strictly control the dimensions of the inner partitions;

[0030] 3) Installation of the steel bridge deck and inner diaphragm: Locate the U-shaped rib at the intersection with the transverse diaphragm, install the inner diaphragm inside the U-shaped rib, and secure the end plates of the inner diaphragm to the inner contour of the U-shaped rib by spot welding or bolting; assemble the U-shaped rib and cover plate, and weld the connecting welds between the U-shaped rib and cover plate to form the steel bridge deck unit;

[0031] 4) Steel Box Girder Assembly: Assemble the bottom plate, web plate, and diaphragm elements of the steel box girder, connecting each plate by welding. Finally, assemble the welded steel bridge deck elements, ensuring that the inner diaphragms align with the diaphragms to form the steel box girder segments.

[0032] In step (4), welding in the assembly of the steel bridge deck is mainly divided into single-sided welding and double-sided welding;

[0033] Use single-sided welding technology: For example, the connection between the inner partition and the inner side of the U-shaped rib adopts single-sided welding;

[0034] Double-sided welding technology is used: such as U-shaped rib internal welding technology, by welding the inner and outer sides of the U-shaped rib at the same time, the U-shaped rib and the steel bridge deck cover are assembled into a steel bridge deck.

[0035] Example 2, as Figure 4 As shown, compared with Example 1, the structure of the inner partition is different. Since other structures are similar to Example 1, they will not be described in detail, and only the differences will be explained. Specifically, the bottom end plate is not welded under the vertical partition, but the two arc-shaped notches at the bottom are enlarged and connected to form an arc-shaped inner recess. The arc-shaped inner recess and the inner side of the lower flange of the U-shaped rib form a hole. The arc-shaped inner recess at the lower end facilitates manual operation during reinforcement and repair construction, that is, the vertical partition does not contact the lower flange of the U-shaped rib. When the U-shaped rib is subjected to force, the inner partition transmits the force it receives to the transverse partition through the side end plate, avoiding damage to the transverse partition cut, thereby extending the service life of the structure. At the same time, the end plate includes a top plate, and the top plate corresponds to the cover plate installed on the upper end of the vertical partition, so that the top end of the inner partition is supported on the lower surface of the cover plate.

[0036] Example 3: Figure 5-6As shown, compared with Example 1, this embodiment is suitable for reinforcement and repair after cracks appear in the transverse diaphragm of an existing steel box girder. The main difference in its structure lies in the shape of the vertical diaphragm. It is no longer a trapezoid with four arc-shaped notches, but the notches are expanded to make the vertical diaphragm into a cross shape. The cross shape is more convenient for manual operation during the reinforcement and repair construction process. The specific structure is: the inner diaphragm includes a vertical diaphragm, and the vertical diaphragm is a vertically arranged cross-shaped plate. The upper limb of the cross-shaped plate abuts under the cover plate, and the left and right side limbs of the cross-shaped plate abut on the inner side of the corresponding U-shaped rib web. The lower limb of the cross-shaped plate is fixed on the inner side of the lower flange of the U-shaped rib. The specific fixing method can be to connect the bottom end plate to the lower limb of the cross-shaped plate, and the bottom end plate is perpendicular to the plane where the cross-shaped plate is located. The bottom end plate is fixed to the inner side of the lower flange of the U-shaped rib by welding or screwing. The preferred method is to fix it by welding, which is convenient for installation and positioning during reinforcement or repair. Since the other structures are the same as Example 1, they will not be described in detail.

[0037] In this embodiment, the specific application in the existing steel box girder structure includes the following steps:

[0038] 1) Inner partition processing: according to the inner size of the U-shaped rib, cut the vertical partition and end plate parts, weld the end plate and vertical partition, and strictly control the size of the inner partition;

[0039] 2) Processing of post-filled U-shaped ribs: After rolling, the outer dimension of the U-shaped ribs is the inner dimension of the post-filled U-shaped ribs, and the height of the post-filled U-shaped ribs is lower than the height of the U-shaped ribs, and higher than the height of the U-shaped ribs of the cut part;

[0040] 3) U-rib cutting near the diaphragm: Cut the web and lower flange of the U-shaped rib in a certain area 10 to 40 cm away from the diaphragm to form a construction space for installing the contact inner diaphragm at the bottom of the U-shaped rib;

[0041] 4) Installation of contact inner partition: The contact inner partition is installed in the corresponding position, and the end plate of the inner partition is fixed to the inner profile of the U-shaped rib by welding or bolting;

[0042] 5) Installation of the supplementary U-shaped rib: The inner side of the supplementary U-shaped rib is close to the outer side of the U-shaped rib, and the length and height of the supplementary U-shaped rib are larger than the U-shaped rib of the cut part. The supplementary U-shaped rib is fixed to the U-shaped rib by welding or bolting.

[0043] Example 4: Figure 7-8As shown, compared with Examples 1, 2, and 3, a support plate is additionally provided for sharing part of the force exerted on the U-shaped rib. Since other structures are similar to Examples 1, 2, and 3, they will not be described in detail, and only the differences will be explained. Specifically, a vertical support plate is fixed on one side plate of the diaphragm, and the lower plate of the support plate is fixed to the diaphragm under the hollow cutout by means of bolts and nuts. The upper end of the support plate abuts against the lower flange of the U-shaped rib, which can share part of the force exerted on the U-shaped rib, and the inner diaphragm transfers the force to the support plate, thereby avoiding damage to the contact-type inner diaphragm and extending the service life of the structure.

[0044] 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.

[0045] 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.

[0046] 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).

[0047] 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.

[0048] 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.

[0049] 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 inner diaphragm structure for reducing stress in the diaphragm cutout area of ​​a steel box girder, comprising a steel box girder, the steel box girder including a steel bridge deck and a plurality of diaphragms spaced lengthwise 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 diaphragm, the diaphragms having hollow cutouts below the U-shaped ribs, the U-shaped rib lower flanges extending through the hollow cutouts, and characterized in that: An inner partition is provided in the U-shaped rib corresponding to the transverse partition, and the inner partition includes a vertical partition. An end plate is provided at the edge of the vertical partition. The vertical partition is fixed in the U-shaped rib through the end plate, and the top end of the inner partition is supported on the lower surface of the cover plate.

2. The U-shaped rib inner partition structure according to claim 1, characterized in that: The vertical partition is a trapezoid arranged corresponding to the U-shaped rib, with the short side of the vertical partition at the bottom and the long side at the top, and arc-shaped notches are arranged at the four corners of the vertical partition.

3. The U-shaped rib inner partition structure according to claim 1, characterized in that: The end plate includes two side end plates, which are installed on the left and right ends of the vertical partition corresponding to the inner side of the U-shaped rib web of the side end plate. The side end plates are spot welded to the end plate edges on the inner side of the corresponding U-shaped rib web.

4. The U-shaped rib inner partition structure according to claim 3, characterized in that: The height of the lower end of the side end plate is at least twice the thickness of the U-shaped rib plate below the upper edge of the cavity cutout.

5. The U-shaped rib inner partition structure according to claim 1, characterized in that: The end plate includes a bottom end plate, which is installed on the lower end of the vertical partition corresponding to the inner side of the lower flange of the U-shaped rib. The bottom end plate is spot welded to the edge of the end plate on the inner side of the lower flange of the U-shaped rib.

6. The U-shaped rib inner partition structure according to claim 1, characterized in that: The end plate includes a top end plate, and the top end plate is mounted on the upper end of the vertical partition corresponding to the cover plate.

7. The U-shaped rib inner partition structure according to claim 1, characterized in that: An arc-shaped inner recess is provided in the middle of the lower portion of the vertical partition, and a hole is formed between the arc-shaped inner recess and the inner side of the lower flange of the U-shaped rib.

8. The U-shaped rib inner partition structure according to claim 1, characterized in that: The vertical partition is a cross-shaped plate, the upper limb of the cross-shaped plate abuts against the bottom of the cover plate, the left and right side limbs of the cross-shaped plate abut against the inner side of the corresponding U-shaped rib web, and the lower limb of the cross-shaped plate is fixed to the inner side of the lower flange of the U-shaped rib.

9. The U-shaped rib inner partition structure according to any one of claims 1 to 8, characterized in that: A vertical support plate is fixed on one side plate of the transverse partition, and the upper end of the support plate is in contact with the lower flange of the U-shaped rib.

10. The U-shaped rib inner partition structure according to claim 9, characterized in that: The lower plate body of the support plate is screwed to the transverse partition plate and below the hollow cutout by means of bolts and nuts.

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