A counterforce support platform suitable for bridge bottom counter-jacking

Abstract

The application discloses a counterforce support platform suitable for bridge bottom counter-jacking, and relates to the technical field of bridge construction. The bottom layer frame comprises at least two groups of steel box beams I arranged along the length direction of the bridge, and each group comprises at least two steel box beams I. The top surface of the bottom layer frame is provided with a second layer frame, the second layer frame comprises a plurality of groups of steel box beams II arranged along the width direction of the bridge, and each group comprises at least two steel box beams II. The top surface of the column is provided with a plurality of layers of steel cushion plates, the steel cushion plates are provided with jacks above the steel cushion plates, and the jacks are provided with steel plate cushion pads above the jacks and in contact with the bottom surface of the bridge. The longitudinal and transverse arrangement of the steel box beams I and the steel box beams II forms a stable and large-area bearing system, the counterforce generated by the jacking of the bridge can be dispersed to a wider area, thereby reducing the local pressure of the foundation and reducing the stress concentration problem.

Description

Technical Field

[0001] This application relates to the field of bridge construction technology, and in particular to a reaction support platform suitable for the bottom and top of bridge beams. Background Technology

[0002] As urban construction moves towards livability and green development, urban bridges, as a crucial part of urban infrastructure, inevitably bear greater responsibility for aesthetic considerations. Beam-arch composite load-bearing bridges are increasingly being used. The construction of beam-arch composite bridges often involves multiple stress system transformations. As the force-transfer structure between the beams and arches, the suspenders often require multiple phases of tension adjustment to bring the bridge to its design stress state. How to safely and efficiently adjust the suspender tension when it is excessive is a topic worthy of research.

[0003] In the past, bridge construction typically involved directly installing several jacks on independent supports, evenly distributing them across the bottom of the bridge, and using the supports to transfer the reaction force to the foundation.

[0004] Regarding the aforementioned technologies, the inventors believe that when jacks lift bridges, the reaction force is often concentrated on a few support points, causing the foundation at these support points to bear excessive pressure and resulting in excessive stress concentration. Utility Model Content

[0005] The purpose of this application is to provide a reaction support platform suitable for the bottom and top of bridge beams, so as to improve the problem of excessive stress concentration caused by excessive pressure on the foundation at the support point.

[0006] This application provides a reaction support platform suitable for the bottom-up orientation of bridge beams, employing the following technical solution:

[0007] A reaction support platform suitable for the bottom and top of bridge beams includes a bottom frame located under the bridge. The bottom frame includes at least two sets of steel box girders arranged along the length of the bridge, each set including at least two steel box girders. A second frame is provided on the top surface of the bottom frame. The second frame includes several sets of steel box girders arranged along the width of the bridge, each set including at least two steel box girders. A column is provided above each set of steel box girders. Several layers of steel pads are provided on the top surface of the column. A jack is provided above the steel pads. A steel plate pad that abuts against the bottom surface of the bridge is provided above the jack.

[0008] By adopting the above technical solution, the steel box girder 1 and steel box girder 2 are arranged in a crisscross pattern to form a stable and large-area load-bearing system, which can disperse the reaction force generated by the jacks lifting the bridge to a wider area, thereby reducing local pressure on the foundation and reducing stress concentration problems. Columns are set above each group of steel box girders 2, and steel pads, jacks, and steel plate supports are sequentially placed on the columns, forming an orderly force transmission structure. This allows the lifting force to be transferred from the jacks to the bottom of the bridge in an orderly and stable manner, ensuring the smoothness of the lifting process.

[0009] Optionally, the thickness of the steel plate pad is greater than the vibration amplitude after the bridge beam is lowered to avoid the bridge coming into contact with the jack after the steel plate pad is removed.

[0010] By adopting the above technical solutions, it is helpful to avoid damage to the jacks caused by vibration after the bridge beams are lowered, and also to prevent unnecessary wear or damage to the bottom of the bridge by the jacks, thus extending the service life of the equipment and the bridge.

[0011] Optionally, the centerline of the second steel box girder in each group coincides with the centerline of the column.

[0012] By adopting the above technical solution, the vertical force on the column is ensured, and the lifting force generated by the jack can be evenly transmitted along the center line of the column to the second steel box girder and the bottom frame, further optimizing the dispersion effect of the reaction force.

[0013] Optionally, the top and bottom surfaces of the column are provided with column head plates, and the column head plates at both ends are fixed to the steel box girder and the steel pad plate, respectively.

[0014] By adopting the above technical solution, the column head plate increases the connection area between the column and the steel box girder and the steel pad, thereby enhancing the connection strength and stability between the components.

[0015] Optionally, the center point of the column is located at the intersection of the diaphragm and the web of the bridge.

[0016] By adopting the above technical solution and setting the column here, the structural advantages of the bridge itself can be fully utilized to better withstand the lifting force of the jacks, while also helping to more effectively transfer the reaction force to the overall structure of the bridge.

[0017] Optionally, several tie beams are fixedly installed between adjacent columns.

[0018] By adopting the above technical solution, the tie beam connects the columns into a whole, which enhances the spatial stability of the entire reaction support platform. At the same time, during the jacking process, the tie beam can restrain the lateral displacement of the columns, reduce the tilting or swaying of the columns, and improve the overall structural safety of the support platform.

[0019] Optionally, some of the tie beams are located between the columns to form a triangular structure.

[0020] By adopting the above technical solution, the triangle structure provides stability, enabling the tie beams to provide more effective support and constraint to the columns, significantly improving the rigidity and deformation resistance of the entire reaction support platform. When subjected to large jacking forces, the triangular structure can evenly distribute the force across the tie beams and columns, further dispersing stress and ensuring the platform's reliability.

[0021] Optionally, one of the steel pads has a locking groove on its bottom surface that is adapted to the column head plate.

[0022] By adopting the above technical solution, the locking groove can play a precise positioning role when installing the steel pad, which helps to accurately align the steel pad with the column head plate; at the same time, the cooperation between the locking groove and the column head plate can also enhance the tightness of the connection between the steel pad and the column, and improve the stability of the entire force transmission structure.

[0023] In summary, this application includes at least one of the following beneficial technical effects for a reaction support platform applicable to the bottom and top of bridge beams:

[0024] 1. The steel box girder 1 and steel box girder 2 are arranged in a crisscross pattern to form a stable and large-area load-bearing system, which can disperse the reaction force generated by the jacks lifting the bridge to a wider area, thereby reducing local pressure on the foundation and reducing stress concentration problems. Columns are set on top of each group of steel box girders 2, and steel pads, jacks, and steel plate supports are set on the columns in sequence, forming an orderly force transmission structure. This allows the lifting force to be transferred from the jacks to the bottom of the bridge in an orderly and stable manner, ensuring the smoothness of the lifting process.

[0025] 2. It helps to avoid damage to the jacks caused by vibration after the bridge beams are lowered, and also prevents the jacks from causing unnecessary wear or damage to the bottom of the bridge, thus extending the service life of the equipment and the bridge.

[0026] 3. Triangles provide stability, and this structure allows the tie beams to provide more effective support and constraint to the columns, greatly improving the rigidity and deformation resistance of the entire reaction support platform. When subjected to large lifting forces, the triangular structure can evenly distribute the force to each tie beam and column, further dispersing stress and ensuring the reliability of the platform. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of a reaction support platform suitable for the bottom and top of bridge beams;

[0028] Figure 2 This is an exploded view illustrating the locking groove in the embodiment.

[0029] In the diagram, 1. Bottom frame; 11. Steel box girder one; 2. Second-layer frame; 21. Steel box girder two; 3. Column; 31. Column head plate; 4. Steel pad plate; 41. Clamping groove; 5. Jack; 6. Steel plate pad; 7. Bridge; 71. Partition plate; 72. Web plate; 8. Tie beam. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1 - Appendix Figure 2 This application will be described in further detail below.

[0031] A reaction support platform suitable for the bottom and top of the 7 beams of a bridge, referring to Figure 1 The structure includes a bottom frame 1 located below the bridge 7. The bottom frame 1 includes at least two sets of steel box girders 11 arranged along the length of the bridge 7, with each set including at least two steel box girders 11. The steel box girders 11 are fixed to the hardened foundation by expansion bolts. A second-layer frame 2 is welded to the top surface of the bottom frame 1. The second-layer frame 2 includes several sets of steel box girders 21 arranged along the width of the bridge 7, with each set including at least two steel box girders 21. Both the steel box girders 11 and 21 are H-beams with dimensions of 650*740mm and a single length of 6m.

[0032] Reference Figure 1 Each group of steel box girders 21 is equipped with a column 3 above it. The column 3 is a φ800*20mm steel pipe column, that is, a circular steel pipe with an outer diameter of 800mm and a wall thickness of 20mm. The steel pipe has high strength and good compressive performance, and is suitable for structures that bear large loads. The column 3 is 1.5m high. The top and bottom surfaces of the column 3 are equipped with column head plates 31, which are steel plates used to strengthen the connection strength and stability of the end of the column 3. The column head plates 31 are fixed to the steel box girder 21 by electric welding. The centerline of each group of steel box girders 21 coincides with the center position of the column 3, and the deviation should be <5cm. The center point of the column 3 is located at the intersection of the diaphragm 71 and the web 72 of the bridge 7, to ensure that the column 3 is subjected to uniform and reasonable stress.

[0033] Reference Figure 1 , Figure 2 The top surface of the column 3 is provided with several layers of steel pads 4, preferably three layers in this embodiment. The steel pads 4 are made of 20mm thick, 800*800mm steel plates. The column head plates 31 at both ends are fixed to the steel box girder 21 and the steel pads 4 respectively, and the column head plates 31 are fixed to the steel box girder 21 by spot welding. One of the steel pads 4 has a locking groove 41 on its bottom surface that fits the column head plate 31, and the locking groove 41 engages with the column head plate 31.

[0034] Reference Figure 1Several tie beams 8 are fixedly installed between adjacent columns 3. The tie beams 8 are channel steel, a type of long strip of steel with a U-shaped cross-section, which has good bending resistance. The tie beams 8 form a triangular structure between the columns 3. Specifically, three tie beams 8 are installed between adjacent columns 3 in a Z-shaped arrangement. The tie beams 8 are fixed to the columns 3 by welding. The triangular structure has the characteristic of strong stability, which can enhance the structural stability of the entire support platform and improve its resistance to deformation.

[0035] Reference Figure 1 A jack 5 is installed above the steel pad 4, and a steel plate pad 6 is installed above the jack 5 to abut against the bottom surface of the bridge 7. The thickness of the steel plate pad 6 is greater than the vibration amplitude after the bridge 7 is lowered to avoid the bridge 7 from contacting the jack 5 after the steel plate pad 6 is removed.

[0036] The implementation principle of this application embodiment is as follows:

[0037] In practical use, the reaction support platform is based on steel box girder 11, with steel box girder 21 arranged in a crisscross pattern, and steel pipe columns 3 welded and fixed to it. The reaction force generated by the jacks 5 lifting the bridge 7 is evenly distributed to the entire platform and foundation. The adjacent columns 3 are connected by tie beams 8 to form a stable triangular structure. At the same time, the steel plate pads 6, which are thicker than the vibration amplitude of the bridge 7 when it is lowered, can not only buffer and protect the bridge 7, but also realize the safe separation of the bridge 7 from the jacks 5. This helps to reduce the stress concentration in the foundation and improve the safety and stability of the bridge 7 lifting construction.

[0038] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A reaction support platform suitable for bridge deck jacking, characterized by: The structure includes a bottom frame (1) located below the bridge (7), the bottom frame (1) including at least two sets of steel box beams (11) arranged along the length of the bridge (7), each set including at least two steel box beams (11); a second frame (2) is provided on the top surface of the bottom frame (1), the second frame (2) including several sets of steel box beams (21) arranged along the width of the bridge (7), each set including at least two steel box beams (21); a column (3) is provided above each set of steel box beams (21), several layers of steel pads (4) are provided on the top surface of the column (3), a jack (5) is provided above the steel pads (4), and a steel plate pad (6) is provided above the jack (5) that abuts against the bottom surface of the bridge (7).

2. The reaction support platform for bridge deck counter-jacking according to claim 1, wherein: The thickness of the steel plate pad (6) is greater than the vibration amplitude after the bridge (7) is lowered to avoid the bridge (7) from contacting the jack (5) after the steel plate pad (6) is removed.

3. The reaction support platform for bridge deck counter-jacking according to claim 1, wherein: The centerline of each group of steel box girder (21) coincides with the centerline of the column (3).

4. The reaction support platform for bridge deck counter-jacking according to claim 3, wherein: The column (3) is provided with a column head plate (31) on the top and bottom surfaces, and the column head plates (31) at both ends are fixed to the steel box girder (21) and the steel pad plate (4) respectively.

5. A reaction support platform suitable for the bottom and top of bridge beams according to claim 4, characterized in that: The center point of the column (3) is located at the intersection of the diaphragm (71) and the web (72) of the bridge (7).

6. A reaction support platform suitable for the bottom and top of bridge beams according to claim 5, characterized in that: Several tie beams (8) are fixedly installed between adjacent columns (3).

7. A reaction support platform suitable for the bottom and top of bridge beams according to claim 6, characterized in that: Several of the tie beams (8) are located between the columns (3) to form a triangular structure.

8. The reaction frame platform for bridge bottom reaction according to claim 4, characterized in that: One of the steel pads (4) has a locking groove (41) on its bottom surface that is adapted to the column head plate (31).

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