Anti-cracking structure for bridge

Abstract

The utility model discloses a bridge is with anti -crack structure, include: reinforcing plate and set up the anchor tendon subassembly on reinforcing plate, reinforcing plate is connected with the reinforcing bar on box girder through anchor tendon subassembly, at least one anti - torsion convex is formed on reinforcing plate, anti - torsion convex is parallel with the joint of two box girders. Set up anti - torsion convex can effectively increase the anti - deformation ability of joint place, thereby avoid the transverse torsional deformation of box girder because of the unbalance of bridge surface load, and then avoid the situation that the crack appears at joint place.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction technology, and more specifically, to a crack-resistant structure for bridges. Background Technology

[0002] Existing research on key technologies for cantilever construction control of main span steel box girders typically requires the use of finite element method (FEM) software to establish a finite element model of the cable-stayed bridge. Taking the Yinghe Grand Bridge project of the Xuzhou-Huaibei-Fuyang Expressway undertaken by the applicant as an example, this paper uses FEM software to establish a full-bridge model and a construction stage model of the Yinghe Grand Bridge. A construction calculation model is then established in the FEM software to obtain the elevation of the beam and the changes in cable tension during construction. This allows for the exploration of how to effectively improve the cantilever assembly accuracy of the steel box girder during construction and to take measures to avoid large displacements during the cantilever assembly process, ensuring the smooth closure of the bridge. The analysis reveals that during the cantilever construction stage, the accumulated building materials, formwork, and cranes on the bridge deck may generate unbalanced lateral loads on the main girder, causing lateral torsional deformation and potentially leading to cracking at the box girder joints. Therefore, improving the torsional strength of the box girder and preventing cracking at the box girder joints is the technical problem this invention aims to solve. Utility Model Content

[0003] The utility model description section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This utility model description section is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0004] To at least partially solve the above problems, this utility model provides a crack-resistant structure for bridges, comprising: a reinforcing plate, and an anchor bar assembly disposed on the reinforcing plate, wherein the reinforcing plate is connected to the reinforcing bars on the box girder through the anchor bar assembly, and at least one torsional protrusion is formed on the reinforcing plate, the torsional protrusion being parallel to the joint between the two box girders.

[0005] Preferably, the anti-torsional protrusion extends away from the bottom surface of the reinforcing plate.

[0006] Preferably, the top surface of the reinforcing plate has a groove formed at the anti-torsional protrusion.

[0007] Preferably, the cross-section of the anti-torsion protrusion is V-shaped.

[0008] Preferably, the number of anti-torsion protrusions is two, and the two anti-torsion protrusions are arranged in parallel.

[0009] Preferably, the anchor bar assembly consists of a first bar arranged in a vertical direction and a second bar arranged in a horizontal direction. The first bar is disposed on the top surface of the reinforcing plate and in the groove of the anti-torsion protrusion, and the second bar is disposed on the top surface of the reinforcing plate and alternately disposed with the first bar.

[0010] Preferably, the direction of the second reinforcement bar is perpendicular to the joint between the two box girders.

[0011] Preferably, it also includes a reinforcing box disposed at the end of the reinforcing plate; the reinforcing box is provided with a third rib, and the reinforcing box is connected to the reinforcing bars on the box beam through the third rib.

[0012] Preferably, the reinforcing box consists of a top plate, a bottom plate, and several first stiffeners. The bottom surface of the top plate is connected to the top surface of the bottom plate through the first stiffeners. The third stiffener is parallel to the top plate and the bottom plate and passes through the first stiffeners. When the number of first stiffeners is greater than one, the first stiffeners are provided with connecting holes.

[0013] Preferably, a plurality of second stiffening plates are provided on the bottom surface of the top plate and the top surface of the bottom plate, the second stiffening plates being parallel to the first stiffening plates.

[0014] When the second stiffener is set on the bottom surface of the top plate, the second stiffener extends from the bottom surface of the top plate to the bottom plate and leaves a first distance between it and the top surface of the bottom plate.

[0015] When the second stiffener is placed on the top surface of the base plate, the second stiffener extends from the top surface of the base plate toward the top plate and leaves a second distance between it and the bottom surface of the top plate.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] Setting anti-torsional protrusions can effectively increase the deformation resistance of the joint, thereby avoiding lateral torsional deformation of the box girder caused by unbalanced bridge deck load, and thus preventing cracking at the joint.

[0018] The bridge crack-resistant structure described in this utility model, along with other advantages, objectives, and features of this utility model, will be partly apparent from the following description and partly understood by those skilled in the art through study and practice of this utility model. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 This is a schematic diagram of the anti-crack structure for bridges described in this utility model.

[0021] Figure 2 This is a left view of the anti-crack structure for bridges described in this utility model.

[0022] Figure 3 This is a front view of the anti-crack structure for bridges described in this utility model.

[0023] Figure 4 This is a schematic diagram of the anti-crack structure for bridges described in this utility model.

[0024] Figure 5 This is a cross-sectional schematic diagram of the anti-crack structure for bridges described in this utility model.

[0025] Figure 6 This is a cross-sectional schematic diagram of the anti-crack structure for bridges described in this utility model.

[0026] Figure 7 This is a cross-sectional schematic diagram of the anti-crack structure for bridges described in this utility model.

[0027] In the diagram: 1. Reinforcing plate, 2. Anti-torsion protrusion, 3. First rib, 4. Second rib, 5. Reinforcing box, 51. Top plate, 52. Bottom plate, 53. First rib plate, 54. Second rib plate, 6. Third rib. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it based on the description.

[0029] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0030] like Figures 1-7 As shown, this utility model provides a crack-resistant structure for bridges, including: a reinforcing plate 1, and an anchor bar assembly disposed on the reinforcing plate 1. The reinforcing plate 1 is connected to the reinforcing bars on the box girder through the anchor bar assembly. After the reinforcing plate 1 is connected to the reinforcing bars of the box girder, formwork can be supported, and then concrete can be poured. At least one anti-torsional protrusion 2 is formed on the reinforcing plate 1. The anti-torsional protrusion 2 is parallel to the joint of the two box girders. The anti-torsional protrusion 2 can effectively increase the deformation resistance at the joint, thereby avoiding lateral torsional deformation of the box girder caused by unbalanced bridge deck load, and thus preventing cracking at the joint.

[0031] Furthermore, the anti-torsional protrusion 2 extends in a direction away from the bottom surface of the reinforcing plate 1, such as... Figure 1 As shown. The anti-torsional protrusion 2 can be formed by bending the reinforcing plate 1 through processes such as cold bending, thereby allowing a groove to be formed on the top surface of the reinforcing plate 1 at the anti-torsional protrusion 2, such as... Figure 1 As shown, this allows the anti-torsional protrusion 2 to exist as an integral part of the reinforcing plate 1. The reinforcing plate 1 is typically made of high-strength steel. During concrete pouring, the concrete within the groove can form shear blocks.

[0032] Furthermore, the anti-torsional protrusion 2 has a V-shaped cross-section, with its opening facing upwards towards the reinforcing plate 1. The reinforcing plate 1 extends from the opening of the anti-torsional protrusion 2 towards the box beams on both sides. Typically, there are two anti-torsional protrusions 2, and they are arranged in parallel, resulting in a W-shaped cross-section for each protrusion. Figure 1 As shown, this enables the crack-resistant structure to have a certain tensile strength when compressed or stretched.

[0033] The anchor bar assembly consists of a first bar 3 arranged vertically and a second bar 4 arranged horizontally. The first bar 3 is disposed on the top surface of the reinforcing plate 1 and within the groove of the anti-torsional protrusion 2. The second bar 4 is disposed on the top surface of the reinforcing plate 1 and alternates with the first bar 3. The direction of the second bar 4 is perpendicular to the joint between the two box girders, such as... Figure 1 As shown.

[0034] Taking the setting of two anti-torsion protrusions 2 as an example, the first rib 3 on the reinforcing plate 1 located between the two anti-torsion protrusions 2 is usually only set on the top surface of the reinforcing plate 1. The first rib 3 on the reinforcing plate 1 located near the box girder usually penetrates the reinforcing plate 1. When pouring concrete, the area between the bottom surface of the reinforcing plate 1 and the two anti-torsion protrusions 2 is not poured with concrete. The reinforcing plate 1 is used as the bottom plate of the joint. As a result, the area between the bottom surface of the reinforcing plate 1 and the two anti-torsion protrusions 2, as well as the outer bottom surface of the anti-torsion protrusions 2, will not be covered with concrete, thereby improving the tensile strength of the crack-resistant structure.

[0035] Furthermore, it also includes a reinforcing box 5 disposed at the end of the reinforcing plate 1; the reinforcing box 5 is provided with a third rib 6, and the reinforcing box 5 is connected to the reinforcing bars on the box beam through the third rib 6. The reinforcing box 5 is composed of a top plate 51, a bottom plate 52 and several first ribs 53. The bottom surface of the top plate 51 is connected to the top surface of the bottom plate 52 through the first ribs 53. The first ribs 53 are used to connect the top plate 51 and the bottom plate 52 into one unit, and the first ribs 53 are parallel to the joint, thereby further improving the torsional strength and reducing the risk of cracking. The third ribs 6 are parallel to the top plate 51 and the bottom plate 52, and the third ribs 6 penetrate through the first ribs 53. When pouring concrete, micro-expansion cement needs to be poured into the interior of the reinforcing box 5 to reduce the impact of concrete shrinkage. Therefore, when the number of first ribs 53 is greater than one, the first ribs 53 are provided with connecting holes to ensure that the concrete can fill the reinforcing box 5. Typically, a plurality of second stiffening plates 54 are provided on the bottom surface of the top plate 51 and the top surface of the bottom plate 52, and the second stiffening plates 54 are parallel to the first stiffening plates 53.

[0036] When the second stiffener 54 is provided on the bottom surface of the top plate 51, the second stiffener 54 extends from the bottom surface of the top plate 51 toward the bottom plate 52 and leaves a first distance between it and the top surface of the bottom plate 52.

[0037] When the second stiffener 54 is provided on the top surface of the base plate 52, the second stiffener 54 extends from the top surface of the base plate 52 toward the top plate 51 and leaves a second distance between it and the bottom surface of the top plate 51.

[0038] Typically, the second stiffening plate 54 of the top plate 51 and the second stiffening plate 54 of the bottom plate 52 are arranged opposite each other, such as Figure 7 As shown, the distance between the two opposing second stiffening plates 54 is not less than the diameter of the connecting hole, so as to facilitate the flow of concrete.

[0039] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0040] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0041] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A crack-resistant structure for bridges, characterized in that, include: A reinforcing plate (1) and an anchor bar assembly disposed on the reinforcing plate (1), the reinforcing plate (1) being connected to the reinforcing bars on the box girder via the anchor bar assembly, the reinforcing plate (1) having at least one anti-torsion protrusion (2) formed thereon, the anti-torsion protrusion (2) being parallel to the joint of the two box girders.

2. The anti-crack structure for bridges according to claim 1, characterized in that, The anti-torsion protrusion (2) extends away from the bottom surface of the reinforcing plate (1).

3. The anti-crack structure for bridges according to claim 2, characterized in that, The top surface of the reinforcing plate (1) has a groove formed at the anti-torsion protrusion (2).

4. The anti-crack structure for bridges according to claim 3, characterized in that, The cross-section of the anti-torsion protrusion (2) is V-shaped.

5. The anti-crack structure for bridges according to claim 4, characterized in that, The number of anti-torsion protrusions (2) is two, and the two anti-torsion protrusions (2) are arranged in parallel.

6. The anti-crack structure for bridges according to claim 3, characterized in that, The anchor bar assembly consists of a first bar (3) arranged in the vertical direction and a second bar (4) arranged in the horizontal direction. The first bar (3) is arranged on the top surface of the reinforcing plate (1) and in the groove of the anti-torsion protrusion (2). The second bar (4) is arranged on the top surface of the reinforcing plate (1) and alternates with the first bar (3).

7. The anti-crack structure for bridges according to claim 6, characterized in that, The second reinforcement (4) is set in a direction perpendicular to the joint between the two box girders.

8. The anti-crack structure for bridges according to claim 1, characterized in that, It also includes a reinforcing box (5) set at the end of the reinforcing plate (1); the reinforcing box (5) is provided with a third rib (6), and the reinforcing box (5) is connected to the reinforcing bars on the box beam through the third rib (6).

9. The anti-crack structure for bridges according to claim 8, characterized in that, The reinforcing box (5) is composed of a top plate (51), a bottom plate (52) and several first stiffeners (53). The bottom surface of the top plate (51) is connected to the top surface of the bottom plate (52) through the first stiffeners (53). The third stiffener (6) is parallel to the top plate (51) and the bottom plate (52). The third stiffener (6) passes through the first stiffeners (53). When the number of first stiffeners (53) is greater than one, the first stiffeners (53) are provided with connecting holes.

10. The anti-crack structure for bridges according to claim 9, characterized in that, A plurality of second stiffening plates (54) are provided on the bottom surface of the top plate (51) and the top surface of the bottom plate (52), the second stiffening plates (54) being parallel to the first stiffening plates (53). When the second stiffener (54) is set on the bottom surface of the top plate (51), the second stiffener (54) extends from the bottom surface of the top plate (51) toward the bottom plate (52) and leaves a first distance between it and the top surface of the bottom plate (52). When the second stiffener (54) is set on the top surface of the bottom plate (52), the second stiffener (54) extends from the top surface of the bottom plate (52) toward the top plate (51) and leaves a second distance between it and the bottom surface of the top plate (51).

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