Large-span steel box girder bridge pile foundation structure

Abstract

The utility model belongs to pile foundation structure technical field especially relates to a large -span steel box girder bridge pile foundation structure. The utility model discloses a plurality of pile basic body, steel box girder bridge and connecting crossbeam, the top of pile basic body is provided with pile top reinforcing structure and upper connecting structure, the pile top reinforcing structure is set in the top of pile basic body, the pile basic body vertical setting, it adopts high -strength reinforced concrete pouring and is formed, inside along the vertical direction evenly arranged with multiple groups of reinforcing steel bar bundle, the reinforcing steel bar bundle is formed by the hoop banding of multiple high -strength reinforced bars, the bottom of pile basic body is provided with the expansion base structure, and the diameter of expansion base part is greater than the diameter of pile basic body main part. The utility model discloses through the special pile top reinforcing structure and upper connecting structure design, has improved the bearing capacity and stability of pile foundation structure significantly, has guaranteed the overall stability and security of bridge.

Description

Technical Field

[0001] This utility model belongs to the field of pile foundation technology and relates to a pile foundation structure for a large-span steel box girder bridge. Background Technology

[0002] Long-span steel box girder bridges are widely used in modern bridge construction due to their advantages such as light weight and large span capacity. However, because long-span steel box girder bridges bear large and complex loads, including vehicle loads, wind loads, and seismic loads, extremely high requirements are placed on the bearing capacity, stability, and durability of the pile foundation structure.

[0003] Currently, existing pile foundation structures for long-span steel box girder bridges present several problems in practical applications. For example, traditional pile foundation structures have weak resistance to horizontal loads under complex geological conditions, easily leading to pile tilting or displacement, affecting the overall stability of the bridge. Simultaneously, the connection between the pile foundation and the superstructure is prone to fatigue failure under long-term repeated loading, reducing the bridge's service life. Furthermore, the construction process for existing pile foundation structures is complex and time-consuming, increasing project costs and construction difficulty. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems by providing a pile foundation structure for a large-span steel box girder bridge.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A pile foundation structure for a long-span steel box girder bridge includes multiple pile foundations, a steel box girder bridge, and connecting crossbeams. The top of each pile foundation is provided with a pile top reinforcement structure and an upper connecting structure. The pile top reinforcement structure is fitted onto the top of the pile foundation. The pile foundation is vertically arranged and is cast with high-strength reinforced concrete. Multiple sets of reinforcing steel bundles are evenly arranged vertically inside. The reinforcing steel bundles are formed by binding multiple high-strength steel bars with stirrups. The bottom of the pile foundation is set as an enlarged base structure, and the diameter of the enlarged base is larger than the diameter of the main body of the pile foundation.

[0007] In the aforementioned large-span steel box girder bridge pile foundation structure, multiple pile foundations are connected by connecting beams. The connecting beams are prestressed concrete structures, and their two ends are connected to adjacent pile foundations by pre-embedded steel bars and grouting.

[0008] In the above-mentioned pile foundation structure of the long-span steel box girder bridge, the pile top reinforcement structure is set on the top of the pile foundation body, which includes an annular reinforcing steel plate and multiple radially distributed stiffening ribs. The reinforcing steel plate is sleeved on the outer side of the top of the pile foundation body, one end of the stiffening rib is connected to the inner side of the reinforcing steel plate, and the other end of the stiffening rib is connected to the side wall of the pile foundation body.

[0009] In the above-mentioned large-span steel box girder bridge pile foundation structure, a fixing slot is provided on the top of the pile foundation body. The fixing slots are evenly distributed in a circle on the side of the pile foundation body, and the stiffening ribs are engaged in the fixing slots.

[0010] In the aforementioned large-span steel box girder bridge pile foundation structure, the superstructure is located above the pile top reinforcement structure. The superstructure includes a connecting steel plate embedded in the pile top reinforcement structure and multiple connecting bolts on the connecting steel plate. The connecting steel plate has bolt holes that match the connecting bolts. The steel box girder bridge is connected to the connecting steel plate by the connecting bolts.

[0011] In the above-mentioned large-span steel box girder bridge pile foundation structure, a lower connecting part is fixedly installed above the pile top reinforcement structure, and several sets of connecting columns are fixedly installed on the upper surface of the lower connecting part.

[0012] In the above-mentioned long-span steel box girder bridge pile foundation structure, the bottom of the upper connecting structure is fixedly provided with an upper connecting part, and the upper connecting part is provided with several sets of connecting holes corresponding to the positions of the connecting columns.

[0013] In the aforementioned long-span steel box girder bridge pile foundation structure, a reinforcing plate is provided at the bottom of the pile foundation body, and the reinforcing plate is evenly distributed on the outer side of the bottom of the pile foundation body.

[0014] In the above-mentioned large-span steel box girder bridge pile foundation structure, the connecting steel plate is provided with a limit slot, and there are several sets of limit slots, which are evenly distributed on both sides of the connecting steel plate. The steel box girder bridge is provided with a limit block, which is engaged in the limit slot.

[0015] In the aforementioned long-span steel box girder bridge pile foundation structure, the limiting slot is an flared structure, and the bolt hole is located on one side of the limiting slot.

[0016] Compared with existing technologies, the advantages of this utility model are:

[0017] 1. This utility model significantly improves the bearing capacity, stability, and durability of the pile foundation structure by using a high-strength reinforced concrete pile foundation, combined with the design of a pile top reinforcement structure and an upper connection structure. The enlarged base structure design enhances the pile foundation's resistance to horizontal loads, effectively preventing pile foundation tilting or displacement, thereby ensuring the overall stability of the bridge.

[0018] 2. The connecting beam of this utility model adopts a prestressed concrete structure and is connected to the pile foundation body through pre-embedded steel bars and grouting, which further improves the overall rigidity and stability of the pile foundation structure. The design of the pile top reinforcement structure and the upper connection structure simplifies the construction process, shortens the construction period, and reduces project costs and construction difficulty.

[0019] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0021] Figure 2 This is a schematic diagram of the external structure of this utility model.

[0022] Figure 3 This is a partial structural schematic diagram of the present invention.

[0023] Figure 4 This is a schematic diagram of the connection between the pile top reinforcement structure and the pile body of this utility model.

[0024] Figure 5 This is a schematic diagram of the top structure of the pile body of this utility model.

[0025] Figure 6 This is a top view schematic diagram of the connecting steel plate structure of this utility model.

[0026] In the diagram: 1. Pile foundation; 2. Steel box girder bridge; 3. Connecting crossbeam; 4. Pile top reinforcement structure; 5. Upper connection structure; 6. Reinforcing bar bundle; 7. Reinforcing steel plate; 8. Stiffening rib; 9. Fixing slot; 10. Connecting steel plate; 11. Connecting bolt; 12. Bolt hole; 13. Lower connection part; 14. Connecting column; 15. Connecting hole; 16. Upper connection part; 17. Reinforcing plate; 18. Limiting slot; 19. Limiting block. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings.

[0028] like Figure 1-6As shown, a pile foundation structure for a long-span steel box girder bridge includes multiple pile foundation bodies 1, a steel box girder bridge 2, and connecting crossbeams 3. The top of the pile foundation body 1 is provided with a pile top reinforcing structure 4 and an upper connecting structure 5. The pile top reinforcing structure 4 is fitted on the top of the pile foundation body 1. The pile foundation body 1 is vertically arranged and is made of high-strength reinforced concrete. Multiple sets of reinforcing steel bundles 6 are evenly arranged in the vertical direction inside. The reinforcing steel bundles 6 are formed by binding multiple high-strength steel bars with stirrups. The bottom of the pile foundation body 1 is set as an enlarged bottom structure, and the diameter of the enlarged bottom part is larger than the diameter of the main body of the pile foundation body 1.

[0029] Furthermore, the multiple pile foundation bodies 1 are connected by connecting beams 3, which are prestressed concrete structures, and their two ends are connected to the adjacent pile foundation bodies 1 by pre-embedded steel bars and grouting.

[0030] In this embodiment, the prestressed steel reinforcement bundles of the connecting beam 3 were tensioned before pouring to ensure the connection strength and durability between the connecting beam 3 and the pile foundation 1.

[0031] Furthermore, the pile top reinforcing structure 4 is set on the top of the pile foundation body 1, which includes an annular reinforcing steel plate 7 and multiple radially distributed stiffening ribs 8. The reinforcing steel plate 7 is sleeved on the outer side of the top of the pile foundation body 1, one end of the stiffening rib 8 is connected to the inner side of the reinforcing steel plate 7, and the other end of the stiffening rib 8 is connected to the side wall of the pile foundation body 1.

[0032] Specifically, the top of the pile foundation body 1 is provided with a fixing groove 9, which is evenly distributed in a circle on the side of the pile foundation body 1, and the stiffening rib 8 is engaged in the fixing groove 9.

[0033] In this embodiment, the fixed slot 9 not only increases the connection stability between the pile foundation 1 and the pile top reinforcing structure 4, but also effectively prevents the pile top reinforcing structure 4 from slipping or falling off during the stress process. Through the snap-fit ​​method, the stiffening rib 8 can be firmly fixed in the fixed slot 9, thereby enhancing the integrity and bearing capacity of the entire pile foundation structure.

[0034] Furthermore, the upper connecting structure 5 is disposed above the pile top reinforcing structure 4. The upper connecting structure 5 includes a connecting steel plate 10 pre-embedded in the pile top reinforcing structure 4 and a plurality of connecting bolts 11 disposed on the connecting steel plate 10. The connecting steel plate 10 is provided with bolt holes 12 that match the connecting bolts 11. The steel box girder bridge 2 is connected to the connecting steel plate 10 through the connecting bolts 11.

[0035] In this embodiment, the connecting steel plate 10 is made of high-strength steel, which has good load-bearing capacity and deformation resistance. The connecting bolts 11 are made of corrosion-resistant, high-strength alloy material to ensure that they will not break or loosen due to environmental erosion or excessive stress during long-term use. This connection method can ensure reliable force transmission between the superstructure and the pile foundation structure, while also facilitating installation and disassembly.

[0036] Furthermore, a lower connecting part 13 is fixedly installed above the pile top reinforcing structure 4, and a number of connecting columns 14 are fixedly installed on the upper surface of the lower connecting part 13.

[0037] In this embodiment, the connecting columns 14 are evenly distributed on the upper surface of the lower connecting part 13, which not only enhances the overall rigidity of the structure but also provides a stable support point for subsequent bridge components. This not only improves the load-bearing capacity of the bridge but also greatly enhances its wind and earthquake resistance, ensuring the safety and stability of the bridge.

[0038] Furthermore, an upper connecting part 16 is fixedly provided at the bottom of the upper connecting structure 5, and the upper connecting part 16 is provided with a plurality of connecting holes 15 corresponding to the positions of the connecting posts 14.

[0039] In this embodiment, the location and size of the connecting hole 15 match the connecting column 14, enabling the upper connecting structure 5 to connect precisely and securely to the pile top reinforcing structure 4. This not only simplifies the installation process and reduces construction difficulty but also ensures the firmness and stability of the connection. Simultaneously, the tight fit between the upper connecting part 16 and the connecting column 14 further enhances the rigidity and load-bearing capacity of the overall bridge structure.

[0040] Furthermore, a reinforcing plate 17 is provided at the bottom of the pile foundation body 1, and the reinforcing plate 17 is evenly distributed on the outer side of the bottom of the pile foundation body 1.

[0041] In this embodiment, the reinforcing plate 17 improves the bearing capacity of the pile foundation, effectively disperses the pressure of the bridge load on the foundation, reduces the risk of foundation settlement, and ensures the strength and stability of the connection.

[0042] Furthermore, the connecting steel plate 10 is provided with a limiting slot 18, and there are several sets of the limiting slot 18, which are evenly distributed on both sides of the connecting steel plate 10. The steel box girder bridge 2 is provided with a limiting block 19, which is engaged in the limiting slot 18.

[0043] Specifically, the limiting slot 18 has an flared structure, and the bolt hole 12 is located on one side of the limiting slot 18.

[0044] In this embodiment, the cooperation between the limiting slot 18 and the limiting block 19 enables precise positioning and stable connection between the steel box girder bridge 2 and the pile foundation structure. This not only simplifies the installation process and improves construction efficiency but also ensures the overall stability and safety of the bridge structure. During bridge operation, the limiting slot 18 and the limiting block 19 can effectively resist various external forces, preventing bridge displacement or deformation, thereby extending the bridge's service life.

[0045] The working principle of this utility model is as follows:

[0046] In use, this utility model involves vertically setting the pile foundation 1 and pouring high-strength reinforced concrete. Simultaneously, multiple sets of reinforcing steel bundles 6 are evenly arranged vertically inside the pile foundation 1 to enhance its bearing capacity. The bottom of the pile foundation 1 is designed as an enlarged base structure to increase the contact area between the pile and the ground, thereby improving the pile's resistance to horizontal loads.

[0047] A pile top reinforcing structure 4 is installed on top of the pile foundation 1. The stiffening ribs 8 are securely connected to the pile foundation 1 by snapping into the fixing grooves 9 on the side of the pile foundation 1. Next, the upper connecting structure 5 is installed. The upper connecting part 16 is provided with connecting holes 15 corresponding to the positions of the connecting columns 14, so that the upper connecting structure 5 can be accurately and securely connected to the pile top reinforcing structure 4.

[0048] Finally, the steel box girder bridge 2 is connected to the connecting steel plate 10 by connecting bolts 11. The limiting block 19 of the steel box girder bridge 2 is engaged in the limiting slot 18 of the connecting steel plate 10, so as to achieve precise positioning and stable connection between the steel box girder bridge 2 and the pile foundation structure.

[0049] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model.

[0050] Although this document frequently uses terms such as 1. pile foundation; 2. steel box girder bridge; 3. connecting beam; 4. pile top reinforcement structure; 5. upper connection structure; 6. reinforcing bar bundle; 7. reinforcing steel plate; 8. stiffening rib; 9. fixing slot; 10. connecting steel plate; 11. connecting bolt; 12. bolt hole; 13. lower connection part; 14. connecting column; 15. connecting hole; 16. upper connection part; 17. reinforcing plate; 18. limiting slot; 19. limiting block, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A pile foundation structure for a long-span steel box girder bridge, comprising a multi-pile foundation body (1), a steel box girder bridge (2), and connecting crossbeams (3), characterized in that, The top of the pile foundation (1) is provided with a pile top reinforcing structure (4) and an upper connecting structure (5). The pile top reinforcing structure (4) is fitted on the top of the pile foundation (1). The pile foundation (1) is vertically arranged and is made of high-strength reinforced concrete. Multiple sets of reinforcing steel bundles (6) are evenly arranged in the vertical direction inside. The reinforcing steel bundles (6) are formed by binding multiple high-strength steel bars with stirrups. The bottom of the pile foundation (1) is set as an enlarged bottom structure. The diameter of the enlarged bottom part is larger than the diameter of the main body of the pile foundation (1).

2. The pile foundation structure for a large-span steel box girder bridge according to claim 1, characterized in that, Multiple pile foundation bodies (1) are connected by connecting beams (3), which are prestressed concrete structures. Their two ends are connected to the adjacent pile foundation bodies (1) by pre-embedded steel bars and grouting.

3. The long-span steel box girder bridge pile foundation structure according to claim 2, characterized in that, The pile top reinforcement structure (4) is set on the top of the pile foundation body (1), which includes an annular reinforcing steel plate (7) and multiple radially distributed stiffening ribs (8). The reinforcing steel plate (7) is sleeved on the outer side of the top of the pile foundation body (1). One end of the stiffening rib (8) is connected to the inner side of the reinforcing steel plate (7), and the other end of the stiffening rib (8) is connected to the side wall of the pile foundation body (1).

4. The long-span steel box girder bridge pile foundation structure according to claim 3, characterized in that, The top of the pile foundation body (1) is provided with a fixing slot (9), which is evenly distributed in a circle on the side of the pile foundation body (1), and the stiffening rib (8) is engaged in the fixing slot (9).

5. The long-span steel box girder bridge pile foundation structure according to claim 4, characterized in that, The upper connecting structure (5) is set above the pile top reinforcing structure (4). The upper connecting structure (5) includes a connecting steel plate (10) pre-embedded in the pile top reinforcing structure (4) and a plurality of connecting bolts (11) set on the connecting steel plate (10). The connecting steel plate (10) is provided with bolt holes (12) that match the connecting bolts (11). The steel box girder bridge (2) is connected to the connecting steel plate (10) through the connecting bolts (11).

6. The long-span steel box girder bridge pile foundation structure according to claim 5, characterized in that, A lower connecting part (13) is fixedly installed above the pile top reinforcement structure (4), and several sets of connecting columns (14) are fixedly installed on the upper surface of the lower connecting part (13).

7. The long-span steel box girder bridge pile foundation structure according to claim 6, characterized in that, The bottom of the upper connecting structure (5) is fixedly provided with an upper connecting part (16), and the upper connecting part (16) is provided with a number of connecting holes (15) corresponding to the positions of the connecting post (14).

8. The long-span steel box girder bridge pile foundation structure according to claim 7, characterized in that, The bottom of the pile foundation body (1) is provided with a reinforcing plate (17), which is evenly distributed on the outer side of the bottom of the pile foundation body (1).

9. The pile foundation structure for a long-span steel box girder bridge according to claim 8, characterized in that, The connecting steel plate (10) is provided with a limiting slot (18), and the limiting slot (18) is provided in several sets and is evenly distributed on both sides of the connecting steel plate (10). The steel box girder bridge (2) is provided with a limiting block (19), and the limiting block (19) is engaged in the limiting slot (18).

10. The pile foundation structure for a large-span steel box girder bridge according to claim 9, characterized in that, The limiting slot (18) has an flared structure, and the bolt hole (12) is located on one side of the limiting slot (18).

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