A main girder cross section structure of a long-span low tower cable-stayed bridge

Abstract

This utility model provides a main beam cross-section structure for a long-span, low-tower cable-stayed bridge, relating to the technical field of main beam cross-section structures. It includes a pier body and a top panel. The pier body has an internally reinforced rib structure, and a cap beam is provided on the upper part of the pier body. A first recess is opened in the middle of the cap beam, and a central insert is installed within the first recess. Positioning holes are provided on both the left and right sides of the cap beam, and positioning columns are embedded within these holes. The upper parts of the central insert and positioning columns are fitted into the lower part of the top panel, and two sets of supports are installed between the bottom surface of the top panel and the cap beam. This utility model not only ensures precise alignment and stability of the bridge's central portion, contributing to the stability of the main beam core, but also effectively resists tensile stresses, significantly improving the bridge structure's bending resistance, making it more stable and robust, preventing the generation and development of cracks, and extending the bridge's service life.

Description

Technical Field

[0001] This utility model relates to the technical field of main beam cross-section structure, specifically to a main beam cross-section structure for a long-span, low-tower cable-stayed bridge. Background Technology

[0002] Prestressed concrete continuous rigid frame bridges are widely used in long-span bridges due to their mechanical and economic advantages, as well as the development of cantilever construction technology. Currently, their application in high-speed railway long-span continuous beam bridges is increasing. The construction methods for long-span, low-tower cable-stayed bridges mainly include the horizontal rotation method, the scaffolding casting method, the cantilever assembly method, and the cantilever casting method. Among these, the horizontal rotation method requires the construction of special ball joints and upper and lower turntables, as well as rotation construction and turntable sealing work, resulting in a long construction period and making it unsuitable for the rapid construction of long-span high-speed railway three-line cable-stayed bridges in complex construction environments. The scaffolding casting method, for the construction of high-pier continuous rigid frame bridges in mountainous areas, requires the erection of high scaffolds during cast-in-place construction, leading to increased construction costs and technical difficulties.

[0003] In the specification of a main beam structure for a long-span, low-tower cable-stayed bridge (publication number CN115341450A), it is mentioned that "the main beam is set along the extension direction of the low-tower cable-stayed bridge, the main beam structure includes a main bridge pier on a ground foundation, the main bridge pier is used to support the main beam, the main beam structure also includes a support casting section, a cantilever casting section and a support system, the support system is set on the outer periphery of the main bridge pier and below the support casting section to form support for the support casting section; the cantilever casting section extends from both sides of the support casting section toward the extension direction of the low-tower cable-stayed bridge, the low tower extends upward from the center of the main beam, and a stay cable is provided between the low tower and each beam segment of the cantilever casting section." However, the connection of the central part of the main beam structure in the prior art is not accurate or tight enough, and the tensile strength and bending resistance of its pier body are insufficient. This may lead to the generation and development of cracks when the bridge encounters sudden external forces, and it is not safe and durable in the long run. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, a main beam section structure for a long-span, low-tower cable-stayed bridge is provided. This addresses the issues of insufficient accuracy and tightness in the central connection of the main beam structure in existing technologies, as well as the inadequate tensile and bending strength of the piers. These shortcomings may lead to crack formation and development when the bridge encounters sudden external forces, resulting in a lack of long-term safety and durability.

[0005] To achieve the above objectives, a main beam cross-section structure for a long-span, low-tower cable-stayed bridge is provided, comprising a pier body and a top panel. The pier body is filled with an internal reinforcing rib structure, and a cap beam is provided on the upper part of the pier body. A first slot is provided in the middle of the cap beam, and a central insert is installed in the first slot. Positioning holes are provided on both the left and right sides of the cap beam, and positioning columns are embedded in the positioning holes. The upper parts of the central insert and the positioning columns are fitted into the lower part of the top panel, and two sets of supports are installed between the bottom surface of the top panel and the cap beam.

[0006] Furthermore, a lower embedded block is fixed to the bottom end of the pier body, and a diagonal brace is fixed between the upper end face of the lower embedded block and the outer side of the pier body, and multiple sets of ground piles are fixed to the lower end face of the lower embedded block.

[0007] Furthermore, the upper end face of the cap beam is fixed with lower sleeve openings on both the left and right sides, and a sleeve plate is provided under the upper panel. The lower part of the upper panel is provided with a main beam, the middle part of the main beam is provided with a through opening, and the lower end face of the main beam is provided with two sets of upper sleeve openings on both the left and right sides.

[0008] Furthermore, the upper and lower sleeves are respectively fitted onto the upper and lower parts of the support, and the upper and lower sleeves are symmetrical about the center line of the support, and the upper and lower sleeves have the same structural configuration.

[0009] Furthermore, the upper left and right sides of the inner reinforcing rib structure are provided with top frames, and multiple sets of vertical connecting ribs are vertically fixed inside the top frames, and two sets of side ribs are fixed on the lower end face of the top frames.

[0010] Furthermore, a first transverse connecting rib is fixed between the two sets of side ribs on the lower left and right sides of the inner reinforcing rib structure, and multiple sets of second transverse connecting ribs are fixed between the two sets of side ribs in the middle, with a central rib vertically fixed on the second transverse connecting rib.

[0011] Furthermore, the lower part of the central plug is provided with a bracket, which is embedded in the first slot in the middle of the cap beam, and the central plug is made of cast steel.

[0012] Furthermore, the positioning column is a solid cylindrical structure made of cast concrete, and a steel frame is installed inside the positioning column.

[0013] The beneficial effects of this utility model are as follows:

[0014] 1. The inclined support frame, the buried block and the ground pile at the bottom of the bridge pier body of this utility model are designed to make the piling more stable and solid, so that the pier body is erected more safely and stably, so as to prevent it from tilting to both sides and making it more solid and reliable.

[0015] 2. In this utility model, the upper sleeve on the lower end face of the main beam and the lower sleeve on the cap beam are aligned vertically and fit together to fit outside the support, making the connection between the left and right sides of the main beam and the cap beam more secure, so as to prevent movement to the sides.

[0016] 3. The internal reinforcing rib structure of the bridge pier in this utility model not only effectively resists tensile stresses and prevents bridge structure fracture due to its high tensile strength, but also significantly improves the bending resistance of the bridge structure, making the bridge more robust under stress. It helps the bridge absorb energy through deformation when encountering sudden external forces, reducing structural damage. It can also improve the seismic performance of the bridge, making it more resistant to earthquakes, preventing the generation and development of cracks, and extending the service life of the bridge.

[0017] 4. This utility model has a central insert and a positioning column installed between the middle of the main beam and the pier body. This not only ensures the precise alignment and stability of the central part of the bridge, but also provides necessary support by connecting the upper panel and the pier body using the central insert and positioning column, which helps to ensure the stability of the core of the main beam and is safer and more reliable. Attached Figure Description

[0018] Figure 1 This is a front view schematic diagram of an embodiment of the present utility model;

[0019] Figure 2 This is a schematic diagram of the bridge pier body according to an embodiment of the present utility model;

[0020] Figure 3 This is a schematic diagram of the internal reinforcing rib structure of an embodiment of the present utility model;

[0021] Figure 4 This is a rendering of the main beam according to an embodiment of the present utility model;

[0022] Figure 5 This is a rendering of the central plug-in in an embodiment of the present utility model.

[0023] In the diagram: 1. Pier body; 10. First recess; 11. Positioning hole; 12. Cap beam; 13. Lower sleeve; 14. Diagonal brace; 15. Lower embedded block; 16. Ground pile; 2. Internal reinforcing structure; 20. Side reinforcement bar; 21. First horizontal connecting bar; 22. Second horizontal connecting bar; 23. Central reinforcement bar; 24. Top frame; 25. Vertical connecting bar; 3. Top panel; 30. Sleeve plate; 31. Main beam; 32. Through opening; 33. Upper sleeve; 4. Support; 5. Central insert; 50. Insert bracket; 6. Positioning column. Detailed Implementation

[0024] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. The specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. Specific details, such as particular system structures and technologies, are provided to facilitate a more thorough understanding of the embodiments of the present utility model. The described embodiments are some, but not all, of the embodiments disclosed herein. However, those skilled in the art should understand that the present utility model can also be implemented in other embodiments without these specific details. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0025] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0026] Figure 1 This is a front view schematic diagram of an embodiment of the present utility model. Figure 2 This is a schematic diagram of the bridge pier body according to an embodiment of the present utility model. Figure 3 This is a schematic diagram of the internal reinforcing rib structure of an embodiment of the present utility model. Figure 4 The main beam rendering of this utility model embodiment and Figure 5 This is a rendering of the central plug-in in an embodiment of the present utility model.

[0027] Reference Figures 1 to 5 As shown, this utility model provides a main beam cross-section structure for a long-span, low-tower cable-stayed bridge, including a pier body 1 and a top panel 3. The pier body 1 is filled with an internal reinforcing rib structure 2, and a cap beam 12 is provided on the upper part of the pier body 1. A first slot 10 is opened in the middle of the cap beam 12, and a central insert 5 is installed in the first slot 10. Positioning holes 11 are provided on both the left and right sides of the cap beam 12, and positioning columns 6 are embedded in the positioning holes 11. The upper parts of the central insert 5 and the positioning columns 6 are both fitted into the lower part of the top panel 3, and two sets of supports 4 are installed between the bottom surface of the top panel 3 and the cap beam 12.

[0028] In this embodiment, a lower embedded block 15 is fixed at the bottom of the pier body 1, and a diagonal brace 14 is fixed between the upper end face of the lower embedded block 15 and the outer side face of the pier body 1, and multiple sets of ground piles 16 are fixed at the lower end face of the lower embedded block 15.

[0029] As a preferred embodiment, the bottom inclined support frame 14, the lower embedded block 15 and the ground pile 16 of the bridge pier body 1 of this utility model are set up to make the pile driving more stable and solid, so that the pier body is erected more safely and stably, so as to prevent it from tilting to both sides and making it more solid and reliable.

[0030] In this embodiment, the upper end face of the cap beam 12 is fixed with lower sleeves 13 on both the left and right sides, and a sleeve plate 30 is provided under the upper panel 3. The lower part of the upper panel 3 is provided with a main beam 31, and the middle part of the main beam 31 is provided with a through opening 32. The lower end face of the main beam 31 is provided with two sets of upper sleeves 33 on both the left and right sides. The upper sleeves 33 and lower sleeves 13 are respectively fitted onto the upper and lower parts of the support 4. The upper sleeves 33 and lower sleeves 13 are symmetrical about the center line of the support 4. The upper sleeves 33 and lower sleeves 13 have the same structural configuration.

[0031] In a preferred embodiment, the upper sleeve 33 on the lower end face of the main beam 31 and the lower sleeve 13 on the cap beam 12 are aligned vertically and fit together to fit the support 4, so that the connection between the left and right parts of the main beam 31 and the cap beam 12 is more secure, so as to prevent movement to the sides.

[0032] In this embodiment, the upper left and right sides of the inner reinforcing rib structure 2 are provided with top frames 24, and multiple sets of vertical connecting ribs 25 are vertically fixed inside the top frames 24. Two sets of side ribs 20 are fixed on the lower end face of the top frames 24. A first transverse connecting rib 21 is fixed between the two sets of side ribs 20 on the lower left and right sides of the inner reinforcing rib structure 2, and multiple sets of second transverse connecting ribs 22 are fixed between the two sets of side ribs 20 in the middle. A central rib 23 is vertically fixed on the second transverse connecting rib 22.

[0033] As a preferred embodiment, the inner reinforcing rib structure 2 of the pier body 1 in this utility model not only effectively resists tensile stresses and prevents bridge structure fracture due to its high tensile strength, but also significantly improves the bending resistance of the bridge structure, making the bridge more robust under stress. It helps the bridge absorb energy through deformation when encountering sudden external forces, reducing structural damage. It can also improve the seismic performance of the bridge, making it more resistant to earthquakes, preventing the generation and development of cracks, and extending the service life of the bridge.

[0034] In this embodiment, the lower part of the central plug-in 5 is provided with a bracket 50, and the bracket 50 is embedded in the first slot 10 in the middle of the cap beam 12. The central plug-in 5 is made of cast steel. The positioning column 6 is a solid cylindrical structure made of concrete, and a steel frame is installed inside the positioning column 6.

[0035] As a preferred embodiment, the present invention installs a central insert 5 and a positioning column 6 between the middle of the main beam 31 and the pier body 1. This not only ensures the precise alignment and stability of the central part of the bridge, but also connects the upper panel 3 and the pier body 1 using the central insert 5 and the positioning column 6, providing necessary support and helping to ensure the stability of the core of the main beam, making it safer and more reliable.

[0036] This invention effectively solves the problems in the prior art where the central connection of the main beam structure is not accurate or tight enough, and the tensile strength and bending resistance of the pier body are insufficient, which may lead to the generation and development of cracks when the bridge encounters sudden external forces, resulting in a lack of long-term safety and durability. This invention not only ensures the precise alignment and stability of the central part of the bridge, helping to guarantee the stability of the main beam core, but also effectively resists these tensile stresses, significantly improves the bending resistance of the bridge structure, makes it more stable and robust, prevents the generation and development of cracks, and extends the service life of the bridge.

[0037] The above embodiments are used to explain and illustrate the present utility model, and not to limit the utility model. Any modifications and changes made to the present utility model within the spirit and scope of the claims should be included within the protection scope of the present utility model.

Claims

1. A main beam cross-section structure for a long-span, low-tower cable-stayed bridge, characterized in that: The bridge includes a pier body (1) and a top panel (3). The pier body (1) is filled with an internal reinforcing rib structure (2). A cap beam (12) is provided on the upper part of the pier body (1). A first slot (10) is opened in the middle of the cap beam (12). A central insert (5) is installed in the first slot (10). Positioning holes (11) are provided on both the left and right sides of the cap beam (12). Positioning columns (6) are embedded in the positioning holes (11). The upper parts of the central insert (5) and the positioning columns (6) are fitted into the lower part of the top panel (3). Two sets of supports (4) are installed between the bottom surface of the top panel (3) and the cap beam (12).

2. The main beam section structure of a long-span, low-tower cable-stayed bridge according to claim 1, characterized in that, The bottom end of the pier body (1) is fixed with a lower embedded block (15), and the upper end face of the lower embedded block (15) is fixed with a diagonal brace (14) between the outer side of the pier body (1), and multiple sets of ground piles (16) are fixed on the lower end face of the lower embedded block (15).

3. The main beam section structure of a long-span, low-tower cable-stayed bridge according to claim 1, characterized in that, The upper end face of the cap beam (12) is fixed with lower sleeves (13) on both the left and right sides, and a sleeve plate (30) is provided under the upper panel (3). The lower part of the upper panel (3) is provided with a main beam (31), the middle part of the main beam (31) is provided with a through opening (32), and the lower end face of the main beam (31) is provided with two sets of upper sleeves (33) on both the left and right sides.

4. The main beam section structure of a long-span, low-tower cable-stayed bridge according to claim 3, characterized in that, The upper sleeve (33) and the lower sleeve (13) are respectively fitted onto the upper and lower parts of the support (4), and the upper sleeve (33) and the lower sleeve (13) are symmetrical about the center line of the support (4), and the upper sleeve (33) and the lower sleeve (13) have the same structural configuration.

5. The main beam section structure of a long-span, low-tower cable-stayed bridge according to claim 1, characterized in that, The upper left and right sides of the inner reinforcing rib structure (2) are provided with top frames (24), and multiple sets of vertical connecting ribs (25) are vertically fixed inside the top frames (24), and two sets of side ribs (20) are fixed on the lower end face of the top frames (24).

6. The main beam section structure of a long-span, low-tower cable-stayed bridge according to claim 5, characterized in that, The inner reinforcing rib structure (2) has a first transverse connecting rib (21) fixed between the two sets of side ribs (20) on the lower left and right sides, and multiple sets of second transverse connecting ribs (22) fixed between the two sets of side ribs (20) in the middle, and a central rib (23) is vertically fixed on the second transverse connecting rib (22).

7. The main beam section structure of a long-span, low-tower cable-stayed bridge according to claim 1, characterized in that, The lower part of the central plug (5) is provided with a bracket (50), and the bracket (50) is embedded in the first slot (10) in the middle of the cap beam (12), and the central plug (5) is made of cast steel.

8. The main beam section structure of a long-span, low-tower cable-stayed bridge according to claim 1, characterized in that, The positioning column (6) is a solid cylindrical structure made of concrete, and a steel frame is installed inside the positioning column (6).

Images