U-shaped rib concrete inner partition plate structure for reducing transverse partition plate notch stress

Abstract

The utility model provides a U-shaped rib concrete inner partition plate structure for reducing transverse partition plate notch stress, which comprises a steel box girder, the steel box girder comprises a steel bridge deck and a plurality of transverse partition plates which are arranged at intervals under the steel bridge deck along the length direction, 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 U-shaped rib. 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, concrete inner partition plates are arranged in the U-shaped ribs and correspond to the transverse partition plates, and a plurality of toggle pins are arranged at intervals in the area defined by the U-shaped ribs and the cover plate and correspond to the periphery of the concrete inner partition plates. Nail heads of the studs are embedded into the edge of the concrete inner partition plate. The structure is reasonable in design, reasonable in stress, high in strength and capable of effectively reducing the stress of the notch area of the diaphragm plate of the steel box girder, reducing the fatigue problem caused by the notch at the connecting position of the steel bridge deck slab and the diaphragm plate, fully guaranteeing the safety of the steel bridge deck slab and being beneficial to prolonging the service life of the steel bridge deck slab.

Description

Technical Field

[0001] The utility model relates to a U-shaped rib concrete inner diaphragm structure for reducing the stress of the transverse diaphragm cutout. Background Art

[0002] Orthotropic steel bridge decks offer the dual advantages of mechanical performance and economy. These structures utilize welded connections to connect the cover plate, longitudinal stiffeners, and transverse diaphragms to form a plate structure that meets varying mechanical requirements in the longitudinal and transverse directions. However, under the repeated action of heavy traffic loads, fatigue cracks form and propagate in fatigue-prone areas with prominent stress concentrations, leading to fatigue failures in orthotropic steel bridge decks. Statistical analysis shows that fatigue cracking occurs at the intersection welds and cutouts between the longitudinal stiffeners and transverse diaphragms, accounting for 38.2% of all cases. These locations are the most complex in orthotropic steel bridge decks, with both high stress concentration and a high risk of initial weld defects.

[0003] Currently, the main methods for repairing fatigue cracks at the intersection welds and cutouts between longitudinal stiffeners and transverse diaphragms are drilling, adding reinforcement plates, thermal repair, and mechanical repair. The drilling method involves drilling a suitable circular hole at the crack tip, thereby reducing the stress concentration at the tip and delaying or arresting crack propagation, thereby extending fatigue life. The reinforcement plate method typically involves covering the fatigue crack area with reinforcement material by welding, bolting, or bonding. Essentially, the reinforcement plate covers the crack to assist the cracked plate in bearing stress, reducing local stress and limiting deformation of the crack surface under fatigue load, thereby improving fatigue performance. Current thermal repair methods mainly include welding and tungsten inert gas remelting. Ultrasonic impact and pneumatic impact are typical mechanical repair methods developed based on hammering and shot peening. Their core essence is to use high-speed impact to plastically impact the metal base material or weld, introducing large residual compressive stresses, which delay crack propagation and improve fatigue life.

[0004] Although there are many methods for repairing fatigue cracks, new fatigue problems will appear after the repair, and the occurrence of fatigue cracks cannot be fundamentally reduced. Therefore, it is necessary to reduce the stress at the location where fatigue cracks occur, so as to fundamentally reduce the occurrence of fatigue cracks and extend the service life of steel bridge decks. Summary of the Invention

[0005] 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 concrete inner diaphragm structure for reducing the stress of the diaphragm cutout. The structure has reasonable force and high strength, which can effectively reduce the stress in the diaphragm cutout area of ​​the steel box girder, reduce the fatigue problem caused by the cutout at the connection between the steel bridge deck and the diaphragm, fully ensure the safety of the steel bridge deck, and help to improve the service life of the steel bridge deck.

[0006] The present invention is implemented by the following scheme: a U-shaped rib concrete inner diaphragm structure for reducing the stress of the diaphragm cut, comprising a steel box girder, the steel box girder comprising a steel bridge deck and a plurality of diaphragms spaced along the length direction under the steel bridge deck, the steel bridge deck comprising a cover plate and U-shaped ribs arranged under the cover plate, the U-shaped ribs passing through each diaphragm, and a hollow cutout is provided on the diaphragm under the U-shaped rib: a concrete inner diaphragm is provided in the U-shaped rib corresponding to the diaphragm, a plurality of bolts are spaced at intervals on the outer periphery of the concrete inner diaphragm in the area enclosed by the U-shaped rib and the cover plate, and the nail heads of the bolts are embedded in the edge of the concrete inner diaphragm.

[0007] Furthermore, the center of the thickness of the concrete inner partition corresponds to the center of the thickness of the transverse partition.

[0008] Furthermore, the cover plate is provided with a grouting port and a grouting outlet corresponding to the concrete inner partition.

[0009] Furthermore, the thickness of the concrete inner partition is 6 to 12 times the thickness of the transverse partition.

[0010] Furthermore, the bolts are arranged in double rows symmetrically with respect to the plane of the diaphragm.

[0011] Preferably, it also includes a template with a handle, which includes two end templates, the shape of the end template corresponds to the cross-sectional shape of the area surrounded by the U-shaped rib and the cover plate, and the end template includes an end template flat plate, and a rubber belt is provided on the edge of the end template flat plate.

[0012] Furthermore, a pull rod is connected to the middle of one side plate surface of the end mold plate.

[0013] Furthermore, the middle parts of one side plate surfaces of the end mold plates of the two end molds are connected by a connecting rod.

[0014] Preferably, it also includes a flexible core bag, the interior of which is provided with a filling cavity, the size of the filling cavity corresponds to the size of the concrete inner partition, and the upper part of the flexible core bag is provided with a grouting hole pipe and a slurry outlet pipe that cooperate with the grouting port and the slurry outlet.

[0015] Furthermore, the filling cavity is provided with a plurality of pairs of tension wires.

[0016] Compared with the existing technology, the utility model has the following beneficial effects: reasonable design, reasonable force and high strength of the structure, which can effectively reduce the stress in the cut area of ​​the steel box girder diaphragm, reduce the fatigue problem caused by the cut at the connection between the steel bridge deck and the diaphragm, fully ensure the safety of the steel bridge deck, and help to improve the service life of the steel bridge deck. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of Example 1 of the present utility model (the two end mold plates are not connected by a connecting rod);

[0018] Figure 2 This is a construction diagram of Example 1 of the present utility model (the two end mold plates are not connected by a connecting rod);

[0019] Figure 3 This is a schematic structural diagram of Example 2 of the present utility model;

[0020] Figure 4 This is a construction diagram of Example 3 of the present utility model (the two end mold plates are connected by a connecting rod);

[0021] Figure 5 This is a schematic structural diagram of Example 4 of the present utility model;

[0022] Figure 6 This is a schematic diagram of Example 4 of the utility model after construction.

[0023] In the figure: 1-steel bridge deck; 101-cover plate; 102-U-shaped rib; 103-grouting port; 104-slurry outlet; 105-U-shaped rib opening; 2-cross partition; 201-hollow cut; 3-bolt; 4-concrete inner partition; 401-hollow circular hole concrete inner partition; 5-steel rod; 6-handled formwork; 601-end form; 602-pull rod; 603-end form plate; 604-rubber belt; 605-handled formwork connected between two end form plates by a connecting rod; 7-core bladder; 701-core bladder grouting hole pipe; 702-slurry outlet pipe. 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, as Figure 1-2The slab is fixed with a U-shaped rib, and the slab is fixed with a U-shaped rib, so that the slab can be fixed with a U-shaped rib.

[0028] In this embodiment, the concrete inner partition is made of ultra-high performance concrete, fiber concrete or grouting material.

[0029] In this embodiment, the thickness of the concrete inner partition along the bridge direction is greater than the thickness of the transverse partition. The thickness of the concrete inner partition may be 6 to 12 times the thickness of the transverse partition, and the thickness of the concrete inner partition is 50 mm to 120 mm.

[0030] In this embodiment, in order to increase the connection force between the concrete inner diaphragm and the U-shaped rib, the studs are arranged in double rows symmetrically with respect to the plane of the transverse diaphragm.

[0031] In this embodiment, if Figure 2 As shown, in order to realize the forming of the concrete inner partition on the U-shaped rib and limit the flow of high-performance concrete, the structure of this patent also includes a handle template, which includes two end templates, and the two end templates correspond to the two side surfaces of the concrete inner partition respectively. The shape of the end template corresponds to the cross-sectional shape of the area enclosed by the U-shaped rib and the cover plate. The end template includes an end template flat plate, and a rubber belt is provided on the edge of the end template flat plate; the size of the end template flat plate is slightly smaller than the space on the inner wall of the U rib, which is convenient for installation; the rubber belt seals the gap between the flat plate and the inner wall of the U rib to prevent leakage of high-performance concrete.

[0032] In this embodiment, which is applied to newly built bridges, a pull rod is connected to the middle of one side of the end formwork plate, and the other end of the pull rod extends along the length direction of the U-shaped rib to facilitate pulling out the formwork with a handle.

[0033] In this embodiment, the specific construction process is applied to a new bridge as follows:

[0034] (1) Fabrication of steel bridge deck: The U-rib and the cover plate unit of the steel bridge deck are processed in the factory, and the grouting port and the grouting outlet are made on the cover plate unit corresponding to the position of the high-performance concrete diaphragm; two rows of bolts are welded inside the U-rib at the connection between the U-rib and the transverse diaphragm and at the corresponding position of the cover plate, and then the U-rib is fixed at the corresponding position of the cover plate unit and welded into shape.

[0035] (2) Installing the formwork: Insert the handle formwork into the specified position of the U rib from both ends of the U rib hole and fix the formwork to form a high-performance concrete cavity in the two handle formworks;

[0036] (3) High-performance concrete pouring: Pour high-performance concrete into the grouting port on the cover plate. After the space between the two handle formworks is fully filled, the high-performance concrete overflows from the grouting port.

[0037] (5) Sealing of steel bridge deck: Use small steel plates to weld and seal the grouting openings of the steel bridge deck;

[0038] (6) Concrete curing: After the high-performance concrete partition is cured and formed, remove the formwork with handles.

[0039] Example 2, as Figure 3 As shown, compared with Example 1, the center of the concrete inner partition in this embodiment is set as a hollow circular hole.

[0040] Example 3, as Figure 4 As shown, compared with Example 1, this embodiment is used for repairing an existing bridge. The template used to restrict the flow of high-performance concrete is a template with a handle connected between two end template plates by a connecting rod. Therefore, a hollow circular hole as in Example 3 will appear in the center of the concrete inner partition. Figure 4 As shown, the middle parts of one side plate surfaces of the end formwork plates of the two end formworks are connected by a connecting rod. At this time, a pull rod is also installed on the side of the end formwork plate where the connecting rod is not set. When applied to an existing steel bridge for repairing a bridge, it is necessary to cut a U-rib opening at a distance from the cross diaphragm, and then the end formwork plates connected by the connecting rod need to be extended from the U-rib opening into the U-rib to the specified position and fixed. Therefore, the length of the pull rod is set corresponding to the distance between the U-rib opening and the specified position. After the high-performance concrete inner diaphragm is cured and formed, the template with a handle is removed, and then the U-rib repair block is fixed at the U-rib opening and welded. The U-rib repair block is slightly larger than the U-rib opening.

[0041] Example 4, as Figure 5-6As shown, compared with Example 1, this embodiment is used for repairing existing bridges, and the template used to restrict the flow of high-performance concrete is a core bag. The specific structure is: it also includes a flexible core bag, and the flexible core bag is made of existing flexible materials. A filling cavity is provided inside the flexible core bag, and the size of the filling cavity corresponds to the size of the concrete inner partition. The upper part of the flexible core bag is provided with a grouting hole pipe and a slurry outlet pipe that cooperate with the grouting port and the slurry outlet, and the filling cavity is provided with a plurality of tension wires.

[0042] In this embodiment, the core bladder's grouting and discharge holes extend 10 to 80 mm above the thickness of the steel bridge deck cover. After the grouting holes are filled with high-performance concrete, they are cut away, and steel rods are inserted through the grouting and discharge ports of the steel bridge deck cover, allowing them to enter the high-performance concrete. The cross-sectional dimensions of the steel rods are slightly smaller than the grouting ports, and the top of the steel rods is flush with the surface of the steel bridge deck. The perimeter of the steel rods is welded to the steel bridge deck cover, and the surface of the cover is welded and ground flat.

[0043] When this embodiment is applied to the steel bridge deck of an existing bridge, the specific construction process is as follows:

[0044] (1) Production of grouting ports for steel bridge deck: Drill circular grouting ports and outlet ports on the cover plate of the steel bridge deck at the corresponding position just above the diaphragm;

[0045] (2) Install the core bag: insert the core bag into the U-rib from the grouting port, leave the core bag grouting hole tube outside the cover plate and fix it, then use professional tools to pull the core bag grouting hole tube out of the cover plate grouting port and fix it;

[0046] (3) High-performance concrete pouring: High-performance concrete is poured into the core bag through the grouting hole pipe. After the core bag is fully filled, the high-performance concrete overflows from the grouting hole pipe;

[0047] (4) Sealing of steel bridge deck: insert the steel rod into the core sac grouting hole pipe and the slurry outlet pipe into the high-performance concrete, with the upper end of the steel rod flush with the cover plate; remove the core sac grouting hole pipe and the slurry outlet pipe above the high-performance concrete partition, weld the steel rod around the grouting port and the slurry outlet of the cover plate to seal the grouting port and the slurry outlet, and grind off the welding material above the steel bridge deck cover plate;

[0048] (5) Concrete curing: high performance concrete curing and molding.

[0049] 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.

[0050] 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.

[0051] 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).

[0052] 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.

[0053] 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.

[0054] 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 concrete inner diaphragm structure for reducing diaphragm cutout stress, comprising a steel box girder, the steel box girder comprising a steel bridge deck and a plurality of diaphragms spaced lengthwise below the steel bridge deck, the steel bridge deck comprising a cover plate and U-shaped ribs disposed below the cover plate, the U-shaped ribs penetrating each diaphragm, the diaphragms having hollow cutouts below the U-shaped ribs, characterized in that: A concrete inner partition is provided in the U-shaped rib corresponding to the transverse partition, and a plurality of studs are provided at intervals on the outer periphery of the concrete inner partition in the area enclosed by the U-shaped rib and the cover plate corresponding to the concrete inner partition, and the heads of the studs are embedded in the edge of the concrete inner partition.

2. The U-shaped rib concrete inner diaphragm structure according to claim 1, characterized in that: The center of the thickness of the concrete inner diaphragm corresponds to the center of the thickness of the transverse diaphragm.

3. The U-shaped rib concrete inner diaphragm structure according to claim 1, characterized in that: The cover plate is provided with a grouting port and a grouting outlet corresponding to the concrete inner partition.

4. The U-shaped rib concrete inner diaphragm structure according to claim 1, characterized in that: The thickness of the concrete inner partition is 6 to 12 times the thickness of the transverse partition.

5. The U-shaped rib concrete inner diaphragm structure according to claim 1, characterized in that: The studs are arranged in double rows symmetrically to the plane of the diaphragm.

6. The U-shaped rib concrete inner diaphragm structure according to any one of claims 1 to 5, characterized in that: It also includes a handle template, which includes two end templates. The shape of the end template corresponds to the cross-sectional shape of the area surrounded by the U-shaped rib and the cover plate. The end template includes an end template plate, and a rubber belt is provided on the edge of the end template plate.

7. The U-shaped rib concrete inner diaphragm structure according to claim 6, characterized in that: A pull rod is connected to the middle portion of one side plate surface of the end mold plate.

8. The U-shaped rib concrete inner diaphragm structure according to claim 6, characterized in that: The middle parts of one side plate surfaces of the end mold plates of the two end molds are connected by a connecting rod.

9. The U-shaped rib concrete inner diaphragm structure according to any one of claims 1 to 5, characterized in that: It also includes a flexible core bag, the interior of which is provided with a filling cavity, the size of the filling cavity corresponds to the size of the concrete inner partition, and the upper part of the flexible core bag is provided with a grouting hole pipe and a slurry outlet pipe that cooperate with the grouting port and the slurry outlet.

10. The U-shaped rib concrete inner diaphragm structure according to claim 9, characterized in that: The filling cavity is provided with a plurality of pairs of tension wires.

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