T-shaped component structure for repairing cracks at welding seam of steel bridge deck cover plate and U rib

Abstract

The utility model provides a T-shaped component structure used for repairing cracks at a welding seam of a steel bridge deck cover plate and a U-shaped rib, which comprises a steel bridge deck, the steel bridge deck comprises the cover plate, the U-shaped rib is welded below the cover plate, a part of the cover plate at a fatigue crack position on the steel bridge deck and a part of U-shaped rib side web plate connected with the part of the cover plate are cut off to form a mounting hole, and the U-shaped rib is welded below the mounting hole. A T-shaped component is mounted on the mounting hole, the T-shaped component comprises a flange plate welded with the edge of the cover plate on the mounting hole, and an inclined web plate welded with the edge of the U-shaped rib side web plate on the mounting hole is arranged on the plate surface of one side of the flange plate. The structure is reasonable, construction is convenient and fast, the problem of crack fatigue at the position of the orthotropic steel bridge deck slab cover plate and the U rib is effectively solved, the service life of the steel box bridge deck slab is prolonged, and the fatigue problem of the steel box bridge deck slab is reduced.

Description

Technical Field

[0001] The utility model relates to a T-shaped component structure for repairing cracks at welds between a steel bridge deck cover plate and a U-rib. Background Art

[0002] Fatigue cracking of welded details in orthotropic steel bridge decks is a key concern in the field of bridge engineering. Among the many welded details prone to fatigue cracking, fatigue cracks in the top plate-U-rib weld area are numerous and pose a serious threat. For in-service steel bridge decks with low fatigue resistance or cracks, how to effectively and conveniently repair and reinforce them has become a hot topic in the field of bridge engineering. In response to the fatigue cracking characteristics of top plate-U-rib welds, a technology for repairing cracks in the welds between steel bridge deck covers and U-ribs was proposed. By adopting this technology, cracks in the welds can be effectively repaired, the structural strength of the bridge can be enhanced, and the service life of the bridge can be extended, while reducing maintenance costs and the impact of construction on traffic. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a T-shaped component structure for repairing cracks at the welds between steel bridge deck cover plates and U-ribs. This structure effectively solves the fatigue problem of cracks at the orthotropic steel bridge deck cover plates and U-ribs, which is beneficial to extend the service life of steel box girder bridge decks and reduce the recurrence of such fatigue problems on steel box girder bridge decks.

[0004] The utility model is implemented by the following scheme: a T-shaped component structure for repairing cracks at the welds between the cover plate and the U-rib of a steel bridge deck, comprising a steel bridge deck, wherein the steel bridge deck comprises a cover plate, and a U-shaped rib is welded under the cover plate: a portion of the cover plate at the location where fatigue cracks occur and a portion of the connected U-shaped rib side web are cut away from the steel bridge deck to form an installation hole, a T-shaped component is installed on the installation hole, the T-shaped component comprises a flange plate welded to the edge of the cover plate on the installation hole, and an inclined web welded to the edge of the U-shaped rib side web on the installation hole is provided on one side plate surface of the flange plate.

[0005] Furthermore, the T-shaped member is formed by hot rolling, the flange plate and the inclined web are formed as one piece, and the lower surface of the flange plate and the upper outer edge and the upper inner edge of the inclined web are transitioned through circular arcs.

[0006] Furthermore, the flange plate and the inclined web plate are fixedly connected by welding.

[0007] Furthermore, the thickness of the flange plate is equal to the thickness of the cover plate, and the thickness of the inclined web is 1-2 times the thickness of the U-rib web.

[0008] Furthermore, the edges of the flange plate and the inclined web are provided with a component semi-V-shaped groove, and the corresponding component semi-V-shaped grooves on the cover plate edge on the installation hole and the U-shaped rib side web edge are provided with a hole semi-V-shaped groove, and the component semi-V-shaped groove is butted with the corresponding hole semi-V-shaped groove to form a V-shaped groove for welding the T-shaped component and the cover plate edge on the installation hole or the U-shaped rib side web edge.

[0009] Furthermore, the groove angles of the semi-V-shaped groove of the component and the semi-V-shaped groove of the hole are both 15~30°.

[0010] Furthermore, the gaps of the semi-V-shaped grooves of the flange plate ports, the gaps of the semi-V-shaped grooves of the inclined web ends, and the gaps of the semi-V-shaped grooves of the cover plate holes are all 4-10 mm.

[0011] Furthermore, a steel pad is welded on the lower surface edge of the flange plate and the inner side edge of the inclined web, and the thickness of the steel pad is not less than 4 mm.

[0012] Furthermore, the length of the mounting hole is greater than the fatigue crack length by 40 mm to 200 mm.

[0013] Furthermore, the flange plate is divided into a left flange plate and a right flange plate by an inclined web plate. The length of the left flange plate and the right flange plate is 1 / 4 to 1 / 3 of the spacing between the web plates of a single U rib, and the length of the inclined web plate is 1 / 5 to 1 / 3 of the height of the U-shaped rib.

[0014] Compared with the existing technology, the utility model has the following beneficial effects: reasonable structure, convenient construction, and effectively solves the problem of crack fatigue at the orthotropic steel bridge deck cover and U-rib, which is beneficial to extend the service life of the steel box girder bridge deck and reduce the recurrence of such fatigue problems on the steel box girder bridge deck. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the steel bridge deck structure of Example 1 of the present utility model;

[0016] Figure 2 This is a schematic structural diagram of the inclined web T-shaped member of Example 1 of the present utility model;

[0017] Figure 3 This is a schematic cross-sectional view of the T-shaped member after installation in Example 1 of the present utility model;

[0018] Figure 4 This is a schematic diagram of the T-shaped component structure of Example 1 of the present utility model;

[0019] Figure 5 This is a schematic diagram of a crack at the weld connecting the cover plate and the U-shaped rib in Example 1 of the present utility model;

[0020] Figure 6 This is a schematic diagram of an inclined web T-shaped member with fatigue cracks removed according to Example 1 of the present invention;

[0021] Figure 7 This is a schematic diagram of the installation of a T-shaped member according to Example 1 of the present utility model;

[0022] Figure 8 This is a structural diagram of Example 2 of the present utility model.

[0023] In the figure: 1—steel bridge deck; 11—cover plate; 12—U-shaped rib; 2—T-shaped member on the inclined web; 21—weld connecting the cover plate and the U-rib; 22—section of the cover plate of the inclined web T-shaped member; 23—section of the U-rib of the inclined web T-shaped member; 3—fatigue crack; 4—V-groove; 41—semi-V-groove of the hole in the cover plate; 42—semi-V-groove of the member on the flange plate; 43—semi-V-groove of the hole in the U-shaped rib; 44—semi-V-groove of the member on the inclined web; 45—semi-V-groove of the member on the flange plate of the welded T-shaped member; 46—Semi-V groove on the inclined web of a welded T-shaped member; 5—Hot-rolled T-shaped member; 51—Flange of a hot-rolled T-shaped member; 52—Inclined web of a hot-rolled T-shaped member; 6—Steel liner; 7—Hole in steel bridge deck; 8—Welded T-shaped member; 81—Flange of a welded T-shaped member; 82—Inclined web of a welded T-shaped member; 83—Outside weld between flange and inclined web of a welded T-shaped member; 84—Inside weld between flange and inclined web of a welded T-shaped member. 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 1-7The U-shaped ribs are welded to the cover plate of the steel bridge deck, and the U-shaped ribs are welded to the cover plate. The steel bridge deck includes a cover plate, and a U-shaped rib is welded under the cover plate. A portion of the cover plate where fatigue cracks occur and a portion of the U-shaped rib side web connected to the cover plate area cut therefrom are cut to form an installation hole. A rectangular hole is cut on the cover plate corresponding to the location where fatigue cracks occur, and a rectangular hole is also synchronously cut out of the U-shaped rib side web connected to the cover plate area cut therefrom. That is, the portion of the cover plate finally cut off and the portion of the U-shaped rib side web connected to the cover plate area cut therefrom form an inclined web T-shaped member. The installation hole is installed with a T-shaped member, and the T-shaped member includes a flange plate welded to the edge of the cover plate on the installation hole, and an inclined web plate welded to the edge of the U-shaped rib side web on the installation hole is provided on one side plate surface of the flange plate. Preferably, the overall size of the T-shaped member is slightly smaller than the inclined web T-shaped member, so that the T-shaped member is convenient for placing the T-shaped member in the installation hole and facilitating construction.

[0028] At present, four forms of fatigue cracks usually appear at the welds between the U-shaped rib and the cover plate: fatigue cracks initiate at the weld toe and extend along the thickness direction of the cover plate; fatigue cracks initiate at the weld toe and extend along the thickness direction of the U-rib plate; fatigue cracks initiate at the weld root and extend along the thickness direction of the cover plate; fatigue cracks initiate at the weld root and extend along the thickness direction of the U-rib.

[0029] In this embodiment, in order to reduce the possibility of such fatigue problems occurring in subsequent steel box girder bridge decks, the T-shaped member is hot-rolled, the flange plate and the inclined web are formed as one piece, and the lower surface of the flange plate and the upper outer edge and the upper inner edge of the inclined web are transitioned through circular arcs.

[0030] In this embodiment, for reasonable design, the thickness of the flange plate is equal to the thickness of the cover plate, and the thickness of the inclined web is 1-2 times the thickness of the U-rib web.

[0031] In this embodiment, the edges of the flange plate and the inclined web are provided with a component semi-V-shaped groove, and the corresponding component semi-V-shaped groove on the edge of the cover plate on the installation hole and the edge of the U-shaped rib side web is provided with a hole semi-V-shaped groove, and the component semi-V-shaped groove is docked with the corresponding hole semi-V-shaped groove to form a V-shaped groove for welding the T-shaped component and the edge of the cover plate on the installation hole or the edge of the U-shaped rib side web. Specifically, the upper surface edge of the flange plate is provided with a component semi-V-shaped groove, and the outer side edge of the inclined web is provided with a component semi-V-shaped groove. The upper surface edge of the cover plate on the installation hole and the outer surface edge of the U-shaped rib side web on the installation hole are provided with corresponding hole semi-V-shaped slopes. A V-shaped groove is formed by docking the component semi-V-shaped groove with the corresponding hole semi-V-shaped groove, which is convenient for welding. Specifically, the groove angles of the component semi-V-shaped groove and the hole semi-V-shaped groove are both 15~30°.

[0032] In this embodiment, in order to further facilitate welding, steel liners are welded to the lower surface edge of the flange plate and the inner side edge of the inclined web, and the thickness of the steel liners is not less than 4 mm.

[0033] In this embodiment, the gap of the semi-V-shaped groove of the flange plate port, the gap of the semi-V-shaped groove of the component at the end of the inclined web, and the gap of the semi-V-shaped groove of the hole of the cover plate or the U-shaped rib side web are all 4-10 mm. The gap of the semi-V-shaped groove of the component and the gap of the semi-V-shaped groove of the component mentioned here refer to the length of the plate surface of the flange plate or the inclined web or the cover plate or the U-shaped rib side web corresponding to the slope of the semi-V-shaped groove, that is, Figure 3 The size of the groove along the plate body direction of the end edge of the semi-V groove set on the flange plate or inclined web plate or cover plate or U-shaped rib side web shown in the cross section.

[0034] In this embodiment, the length of the mounting hole is greater than the fatigue crack length of 40 mm to 200 mm, that is, fatigue cracks generally appear on the weld seam between the U-shaped rib and the cover plate, and the extension direction is mostly along the length of the weld seam. Therefore, the length direction of the mounting hole mentioned here refers to the length direction of the U-shaped rib, that is, Figure 5 In the direction of the fatigue crack length, the length of the installation hole is the distance between the two ends of the flange plate along the length of the U-shaped rib, so the distance between the two ends of the flange plate along the length of the U-shaped rib is greater than the fatigue crack length by 40 mm~200 mm.

[0035] In this embodiment, the flange plate is divided into a left flange plate and a right flange plate by an oblique web plate. The length of the left flange plate and the right flange plate is 1 / 4 to 1 / 3 of the spacing between the web plates on both sides of a single U-shaped rib. The direction of the length of the left flange plate and the right flange plate mentioned here is different from the direction of the length of the mounting hole. The direction of the length of the left flange plate and the right flange plate is the spacing direction of the web plates on both sides of a single U-shaped rib, that is, Figure 4 The length direction of the flange section is shown in FIG. 1 , and the length of the inclined web is 1 / 5 to 1 / 3 of the height of the U-shaped rib. The length direction of the inclined web here is the length direction of the U-shaped side of the side web of the U-shaped rib section, that is, Figure 4 The length direction of the inclined web section is shown.

[0036] In this embodiment, the lengths of the flange plates and the inclined web plates are set to ensure the overall structural strength after repair.

[0037] In this embodiment, the overall repair construction method is:

[0038] (1) Measure the length of the weld between the cover plate and the U-shaped rib: Preliminarily identify obvious cracks on the top plate of the steel bridge by visual inspection or with the help of tools such as a magnifying glass and light. Use a marker or spray paint to mark the location, length and direction of the crack. Use ultrasound to detect the depth and length of the crack. Move the ultrasonic probe along the crack area, receive signal changes to analyze the crack size, and record the length, width and depth of the crack.

[0039] (2) Remove the fatigue cracked inclined web T-shaped member: Determine the length of the inclined web T-shaped member of the top plate and determine the height to be 1 / 3 of the U rib height. Perform precise calibration in the area to be cut. Use a laser measuring instrument or manual measuring tool to mark the cutting line and cut. Then use a precision measuring instrument to check the cutting edge. Finally, use an angle grinder to grind out a V-shaped groove. After the groove is made, clean the groove area with a wire brush or grinding wheel.

[0040] (3) Hot rolling of T-shaped components: According to the design requirements, the appropriate billet is selected and pre-treated by removing rust and cleaning the surface oxide scale. The billet is placed in a heating furnace for heating to reach a thermoplastic state. The heated billet first enters the rough rolling mill for preliminary rolling. During the rough rolling stage, the billet is pressed down by multiple rollers, gradually thinning and stretching it, and gradually rolling the original billet from a thick rectangular or square cross-section into a thinner and wider shape, forming the prototype of the T-shaped component. The rollers are used to apply vertical pressure to the web of the billet, forming the vertical section in the middle of the T-shaped component, gradually determining the thickness and height of the web. During the rolling process, the angle and pressure of the rollers are adjusted to gradually form an inclined web on one side of the T-shaped component. Finish rolling then determines the final shape and size of the inclined web. During this finishing phase, rollers further compress the inclined web and web, precisely controlling the angle of the inclined web to create the desired inclined structure. The flanges of the top flange are also formed by rollers during this stage, maintaining a tight connection with the web and inclined web. After hot rolling, the components are cooled using air or spray water. Straightening is performed on a straightener, followed by annealing. Descaling is then performed through mechanical sandblasting, pickling, and other processes. Finally, the finished components are thoroughly inspected for size, shape, straightness, and surface quality using precision measuring tools or automated testing equipment to ensure they meet design requirements.

[0041] (4) Installation of T-shaped components: Before installation, ensure that the material surface is clean and free of oil, rust, and scale. Cut and process the steel liner according to the size, groove angle, and design requirements of the hot-rolled T-shaped component. Install the steel liner on the back of the welded joint and secure it by spot welding. Use a grinder to grind and clean the groove surface, then install the T-shaped component and secure it by spot welding.

[0042] (5) Welding of T-shaped components: After welding the first weld of the V-shaped groove, complete the root weld, fill the groove layer by layer, and perform multi-layer filling welding. After the filling welding is completed, the cover welding is finally performed. After each layer of welding is completed, the weld surface should be cleaned with a wire brush or grinder to remove slag, spatter, etc. After welding is completed, the weld needs to be gradually cooled. Finally, a visual inspection is carried out to ensure that the weld surface is smooth, free of cracks, pores or welding defects. Welds that do not meet the requirements are polished.

[0043] Example 2: Figure 8 As shown, compared with Example 1, the difference is that the flange plate and the inclined web are fixedly connected by welding, and the other structures are similar to Example 1, so they will not be described in detail. Specifically, the flange plate and the inclined web are connected by double-sided welding.

[0044] In this embodiment, the double-sided welding method involves aligning the inclined web and flange plates according to design requirements. First, perform tack welding, making several short welds on each side. Next, perform fillet welds on the outer sides where the U-shaped ribs intersect the cover plate. For thicker materials, multiple layers of welding may be required. After the outer welds are completed, continue welding the inclined web and flange plates on the other side, performing fillet welds on the inner sides. To minimize welding distortion, alternate welds are performed on both sides. After welding, clean the weld surface of the weld with a wire brush or a grinding tool to remove slag and spatter.

[0045] 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.

[0046] 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.

[0047] 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).

[0048] 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.

[0049] 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.

[0050] 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 T-shaped member structure for repairing cracks at the weld between a steel bridge deck cover plate and a U-rib, comprising a steel bridge deck, the steel bridge deck including a cover plate, and a U-shaped rib welded below the cover plate, characterized in that: Part of the cover plate where fatigue cracks occur and the connected part of the U-shaped rib side web are cut away from the steel bridge deck to form an installation hole, and a T-shaped component is installed on the installation hole. The T-shaped component includes a flange plate welded to the edge of the cover plate on the installation hole, and an inclined web welded to the edge of the U-shaped rib side web on the installation hole is provided on one side plate surface of the flange plate.

2. The T-shaped member structure according to claim 1, characterized in that: The T-shaped member is formed by hot rolling, the flange plate and the inclined web plate are formed as one piece, and the lower surface of the flange plate and the upper outer edge and the upper inner edge of the inclined web plate are transitioned through circular arcs.

3. The T-shaped member structure according to claim 1, characterized in that: The flange plate and the inclined web plate are fixedly connected by welding.

4. The T-shaped member structure according to any one of claims 1 to 3, characterized in that: The thickness of the flange plate is equal to that of the cover plate, and the thickness of the inclined web plate is 1-2 times the thickness of the U-rib web plate.

5. The T-shaped member structure according to any one of claims 1 to 3, characterized in that: The edges of the flange plate and the inclined web are both provided with a component semi-V-shaped groove, and the corresponding component semi-V-shaped grooves on the cover plate edge on the installation hole and the U-shaped rib side web edge are provided with a hole semi-V-shaped groove. The component semi-V-shaped groove is butted with the corresponding hole semi-V-shaped groove to form a V-shaped groove for welding the T-shaped component and the cover plate edge on the installation hole or the U-shaped rib side web edge.

6. The T-shaped member structure according to claim 5, characterized in that: The groove angles of the semi-V-shaped groove of the component and the semi-V-shaped groove of the hole are both 15~30°.

7. The T-shaped member structure according to claim 5, characterized in that: The gaps of the semi-V-shaped grooves of the flange plate ports, the gaps of the semi-V-shaped grooves of the inclined web ends, and the gaps of the semi-V-shaped grooves of the cover plate holes are all 4-10 mm.

8. The T-shaped member structure according to claim 5, characterized in that: Steel pads are welded on the lower surface edge of the flange plate and the inner side edge of the inclined web, and the thickness of the steel pads is not less than 4 mm.

9. The T-shaped member structure according to any one of claims 1 to 3, characterized in that: The length of the mounting hole is 40 mm to 200 mm greater than the fatigue crack length.

10. The T-shaped member structure according to any one of claims 1 to 3, characterized in that: The flange plate is divided into a left flange plate and a right flange plate by an inclined web plate. The length of the left flange plate and the right flange plate is 1 / 4 to 1 / 3 of the spacing between the web plates of a single U rib, and the length of the inclined web plate is 1 / 5 to 1 / 3 of the height of the U-shaped rib.

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