Fabricated bridge steel structure box girder

Abstract

The utility model provides an assembly type bridge steel structure box girder, and relates to the technical field of bridge structures. The fabricated bridge steel structure box girder comprises a top plate and a bottom plate, a lower clamping groove is formed in the middle of the bottom plate, a lower limiting groove is formed in the middle of the lower clamping groove, an upper clamping groove is formed in the middle of the top plate, and an upper limiting groove is formed in the middle of the upper clamping groove; a connecting structure is arranged on the inner wall of the lower clamping groove, and an upper limiting block and a lower limiting block are arranged on the connecting structure; the connecting structure can drive the upper limiting block to slide in the depth direction of the upper limiting groove on one hand, and can drive the lower limiting block to slide in the depth direction of the lower limiting groove on the other hand, so that the top plate and the bottom plate are quickly clamped. According to the fabricated bridge steel structure box girder, the balancing weight starts to move downwards under the action of gravity, the effect of convenient clamping is achieved, the effect of improving the use convenience of the steel structure box girder is achieved, the effect of closed surrounding is achieved, and the effect of improving the use sealing performance of the steel structure box girder is achieved.

Description

Technical Field

[0001] This utility model relates to a prefabricated bridge steel structure box girder, belonging to the field of bridge structure technology. Background Technology

[0002] The steel box girder, also known as a steel plate box girder, is a type of prefabricated bridge steel structure box girder. It is generally composed of a top plate, bottom plate, and web plate, which are connected by welding or high-strength bolts. It is commonly used in bridges with large spans and is named for its box-shaped shape.

[0003] Currently, common prefabricated steel box girder structures can basically meet the needs of daily use. However, in actual operation, their connection methods have revealed significant drawbacks. The mainstream methods for connecting prefabricated steel box girder structures are welding and bolting. Welding requires specialized technicians using dedicated welding equipment, operating on-site for extended periods. Strict control of parameters such as welding current, voltage, and welding speed is crucial; any slight deviation can affect welding quality. Furthermore, post-weld inspection and other follow-up procedures are necessary, making the entire process extremely cumbersome. Bolting, on the other hand, requires precise positioning of bolt holes, individual bolt installation, and tightening to the specified torque. In large box girder projects, the sheer number of bolts makes installation time-consuming and labor-intensive. This connection method significantly restricts construction progress, greatly diminishing the convenience of steel box girder structures in practical applications, and consequently, compromising their usability.

[0004] Furthermore, the welds and bolts are completely exposed to the external environment after connection. During daily use, flying stones kicked up by passing vehicles and impacts from foreign objects can easily damage the welds, leading to cracks and other defects, weakening the strength of the connection. Simultaneously, long-term exposure to air and rainwater can cause the bolts to rust, reducing their tightening force and even causing them to loosen. Damage to these connections not only affects the structural stability of the steel box girder but also increases the difficulty and cost of daily maintenance. Due to the exposure of the connections, external moisture and corrosive gases can easily reach the internal structure of the box girder, posing a challenge to its protection and resulting in insufficient sealing during use. Utility Model Content

[0005] Technical problems to be solved

[0006] This utility model provides a prefabricated steel structure box girder for bridges, which solves the problems of insufficient ease of use and insufficient enclosure of existing steel structure box girders.

[0007] Technical solution

[0008] This utility model is achieved through the following technical solution: a prefabricated bridge steel structure box girder, including a top plate and a bottom plate, wherein a lower slot is provided in the middle of the bottom plate, a lower limiting slot is provided in the middle of the lower slot, an upper slot is provided in the middle of the top plate, and an upper limiting slot is provided in the middle of the upper slot.

[0009] The inner wall of the lower slot is provided with a connecting structure, on which an upper limit block and a lower limit block are provided; the connecting structure can slide the upper limit block in the direction of the upper limit slot depth on one hand, and slide the lower limit block in the direction of the lower limit slot depth on the other hand, so as to quickly engage the top plate and the bottom plate.

[0010] Preferably, the connecting structure includes a lower locking block, a web plate is fixed to the upper end of the lower locking block, an upper locking block is fixed to the upper end of the web plate, sliding frames are slidably connected to both sides of the web plate, and two connecting frames are rotatably connected to the adjacent ends of the two sliding frames. An upper limit block is rotatably connected to the upper end of the two connecting frames, and a counterweight is rotatably connected to the lower end of the other two connecting frames. A lower limit block is fixed to the middle of the lower end of the counterweight.

[0011] Preferably, the outer surface of the lower limiting block is in contact with the inner wall of the lower limiting groove, the outer surface of the upper limiting block is in contact with the inner wall of the upper limiting groove, the upper limiting block passes through the middle of the web and the upper locking block, and the lower limiting block passes through the middle of the web and the lower locking block.

[0012] Preferably, the outer surface of the upper card block is in contact with the inner wall of the upper card slot, and the vertical cross-section of the upper card block is T-shaped; the outer surface of the lower card block is in contact with the inner wall of the lower card slot, and the vertical cross-section of the lower card block is inverted T-shaped.

[0013] Preferably, the upper ends of two of the connecting frames are rotatably connected to the lower end of the upper limit block, the lower ends of the other two connecting frames are rotatably connected to the upper end of the counterweight block, and the adjacent ends of the four connecting frames are rotatably connected to the adjacent ends of two sliding frames.

[0014] Preferably, each of the two sliding frames is fixed with a closed frame at its disjoint ends, and each of the two closed frames is fixed with a rubber pad at both ends.

[0015] Preferably, each pair of adjacent rubber pads are in contact, the middle of the two closed frames is fixed to the opposite ends of the two sliding frames, the inner walls of the two closed frames are slidably connected to the outer surface of the web, and the outer surfaces of the two sliding frames are slidably connected to the inner walls of the middle of the two webs.

[0016] This utility model provides a prefabricated bridge steel structure box girder, which has the following beneficial effects:

[0017] (1) The prefabricated bridge steel structure box girder, through the counterweight block moving downward under the action of gravity, makes the lower slot, lower limit slot, upper slot, upper limit slot, lower block, web plate, upper block, sliding frame, connecting frame, upper limit block, counterweight block and lower limit block work together to achieve the effect of convenient snap-fit. This assembly method greatly simplifies the operation process of the staff, provides great convenience for the assembly operation, and thus improves the ease of use of the steel structure box girder.

[0018] (2) The prefabricated bridge steel structure box girder, through the counterweight block moving downward under the action of gravity, makes the sliding frame, connecting frame, counterweight block, enclosed frame and rubber pad work together to achieve the effect of enclosed enclosure, effectively avoiding the impact of external objects and rainwater erosion, preventing them from affecting the normal use of the box girder, and thus improving the use of the steel structure box girder. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a partial cross-sectional view of the present invention;

[0021] Figure 3 This utility model Figure 2 Enlarged view of the A-section structure;

[0022] Figure 4 This is a partial structural schematic diagram of the present invention.

[0023] [Explanation of Key Component Symbols]

[0024] 1. Top plate; 2. Bottom plate; 3. Lower slot; 4. Lower limit slot; 5. Upper slot; 6. Upper limit slot; 7. Lower block; 8. Web plate; 9. Upper block; 10. Sliding frame; 11. Connecting frame; 12. Upper limit block; 13. Counterweight block; 14. Lower limit block; 15. Enclosure frame; 16. Rubber pad. Detailed Implementation

[0025] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0026] Example 1

[0027] This utility model embodiment provides a prefabricated bridge steel structure box girder.

[0028] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4The box girder includes a top plate 1 and a bottom plate 2. The top plate 1 and bottom plate 2, together with the web plate 8 and its connecting parts, constitute a box girder. A lower slot 3 is provided in the middle of the bottom plate 2. The lower slot 3 and the lower slot block 7 cooperate to lock together. A lower limit slot 4 is provided in the middle of the lower slot 3. An upper slot 5 is provided in the middle of the top plate 1. An upper limit slot 6 is provided in the middle of the upper slot 5. A connecting structure is provided on the inner wall of the lower slot 3. The connecting structure includes a lower slot block 7. The web plate 8 is fixed to the upper end of the lower slot block 7. An upper slot block 9 is fixed to the upper end of the web plate 8. Sliding frames 10 are slidably connected to both sides of the web plate 8. Two connecting frames 11 are rotatably connected to the near ends of the two sliding frames 10. An upper limit block 12 is rotatably connected to the upper end of the two connecting frames 11. A counterweight block 13 is rotatably connected to the lower end of the other two connecting frames 11. A lower limit block 14 is fixed to the middle of the lower end of the counterweight block 13.

[0029] Please refer to it again. Figure 1 , Figure 2 , Figure 3 and Figure 4 It is worth noting that the outer surface of the lower limit block 14 is in contact with the inner wall of the lower limit groove 4, the outer surface of the upper limit block 12 is in contact with the inner wall of the upper limit groove 6, the upper limit block 12 passes through the middle of the web plate 8 and the upper locking block 9, the lower limit block 14 passes through the middle of the web plate 8 and the lower locking block 7, the outer surface of the upper locking block 9 is in contact with the inner wall of the upper locking groove 5, the vertical cross-section of the upper locking block 9 is T-shaped, the outer surface of the lower locking block 7 is in contact with the inner wall of the lower locking groove 3, the vertical cross-section of the lower locking block 7 is inverted T-shaped, the upper ends of two connecting frames 11 are rotatably connected to the lower end of the upper limit block 12, the lower ends of the other two connecting frames 11 are rotatably connected to the upper end of the counterweight block 13, and the near ends of the four connecting frames 11 are rotatably connected to the near ends of the two sliding frames 10.

[0030] In use, the following steps are necessary: ​​First, the web plate 8 must be precisely installed. The upper locking block 9 and lower locking block 7, fixed at both ends of the web plate 8, are inserted into the upper locking groove 5 of the top plate 1 and the lower locking groove 3 of the bottom plate 2, respectively. This step requires precise alignment of the locking blocks and grooves to ensure smooth subsequent assembly. Then, the web plate 8 is smoothly pushed along the groove direction. During this pushing process, close attention should be paid to the positions of the upper limit block 12 and the lower limit block 14 connected to the web plate 8. The web plate 8 is continuously pushed until the upper limit block 12 is precisely aligned with the upper limit groove 6 in the upper locking groove 5, and simultaneously the lower limit block 14 is fully aligned with the lower limit groove 4 in the lower locking groove 3.

[0031] Once the precise alignment is achieved, the counterweight 13 begins to move downwards under gravity. During this downward movement, the lower limit block 14, fixedly connected to the middle of its lower end, inserts into the lower limit groove 4. Simultaneously, two connecting frames 11 rotatably connected to the upper end of the counterweight 13 will move in tandem. Due to the limiting effect of the structure in the middle of the web 8, these two connecting frames 11 will cause the two sliding frames 10 to move closer together. These two sliding frames 10, in turn, through the other two connected connecting frames 11, will cause the upper limit block 12 to accurately insert into the upper limit groove 6. Through this series of operations, the top plate 1 and the bottom plate 2 are firmly secured to the web 8, achieving a convenient locking effect. This assembly method greatly simplifies the operation process for workers, provides significant convenience for assembly work, and thus improves the ease of use of the steel structure box girder.

[0032] Example 2

[0033] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 Based on Embodiment 1, a closed enclosure function has been added;

[0034] Please refer to it again. Figure 1 , Figure 2 , Figure 3 and Figure 4 It is worth noting that each of the two sliding frames 10 has a closed frame 15 fixed at its opposite ends, and each of the two closed frames 15 has a rubber pad 16 fixed at both ends. Every two adjacent rubber pads 16 are in contact with each other. The middle part of the two closed frames 15 is fixed to the opposite ends of the two sliding frames 10. The inner walls of the two closed frames 15 are slidably connected to the outer surface of the web plate 8, and the outer surfaces of the two sliding frames 10 are slidably connected to the inner walls of the middle part of the two web plates 8.

[0035] In use, this invention works as follows: the counterweight 13 moves downward under gravity, causing the two connecting frames 11 connected to it to move accordingly. Under the limiting constraint of the web plate 8, these two connecting frames 11 drive the two sliding frames 10 to move closer together. As the sliding frames 10 move closer, the two closing frames 15 fixed at their opposite ends also move synchronously towards each other. This continues until the web plate 8 is securely locked between the top plate 1 and the bottom plate 2. At this point, the four rubber pads 16 fixed at the near ends of the two closing frames 15 are tightly fitted together. This process completes the enclosed enclosure of the web plate 8 and its central connecting parts, achieving a closed enclosure effect, effectively preventing impacts from external objects and rainwater erosion, preventing them from affecting the normal use of the box girder, and thus improving the sealing performance of the steel structure box girder.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A fabricated bridge steel structure box girder, comprising a top plate (1) and a bottom plate (2), characterized in that: The bottom plate (2) is provided with a lower clamping groove (3) in the middle, the lower clamping groove (3) is provided with a lower limiting groove (4) in the middle, the top plate (1) is provided with an upper clamping groove (5) in the middle, and the upper clamping groove (5) is provided with an upper limiting groove (6) in the middle. The inner wall of the lower clamping groove (3) is provided with a connecting structure, and the connecting structure is provided with an upper limiting block (12) and a lower limiting block (14); the connecting structure can slide with the upper limiting block (12) in the depth direction of the upper limiting groove (6), and can slide with the lower limiting block (14) in the depth direction of the lower limiting groove (4), so as to quickly clamp the top plate (1) and the bottom plate (2).

2. The prefabricated steel bridge structure box girder according to claim 1, characterized in that: The connecting structure comprises a lower clamping block (7), the upper end of the lower clamping block (7) is fixedly connected with a web plate (8), the upper end of the web plate (8) is fixedly connected with an upper clamping block (9), both sides of the web plate (8) are slidably connected with sliding frames (10), the proximal ends of the two sliding frames (10) are rotatably connected with two connecting frames (11), the upper ends of the two connecting frames (11) are rotatably connected with upper limiting blocks (12), and the lower ends of the other two connecting frames (11) are rotatably connected with counterweight blocks (13).

3. The prefabricated steel bridge structure box girder according to claim 2, characterized in that: The outer surface of the lower limiting block (14) is in contact with the inner wall of the lower limiting groove (4), the outer surface of the upper limiting block (12) is in contact with the inner wall of the upper limiting groove (6), the upper limiting block (12) penetrates the middle of the web plate (8) and the upper clamping block (9), and the lower limiting block (14) penetrates the middle of the web plate (8) and the lower clamping block (7).

4. The prefabricated steel bridge structure box girder according to claim 2, characterized in that: The outer surface of the upper clamping block (9) is in contact with the inner wall of the upper clamping groove (5), the vertical section of the upper clamping block (9) is T-shaped, the outer surface of the lower clamping block (7) is in contact with the inner wall of the lower clamping groove (3), and the vertical section of the lower clamping block (7) is inverted T-shaped.

5. The prefabricated steel bridge structure box girder according to claim 2, characterized in that: The upper ends of the two connecting frames (11) are rotatably connected to the lower ends of the upper limiting blocks (12), and the lower ends of the other two connecting frames (11) are rotatably connected to the upper ends of the counterweight blocks (13).

6. The prefabricated steel bridge structure box girder according to claim 2, characterized in that: The proximal ends of the four connecting frames (11) are rotatably connected to the proximal ends of the two sliding frames (10).

7. The prefabricated steel bridge structure box girder according to claim 6, characterized in that: Both ends of the two closed frames (15) are fixedly connected with rubber pads (16). Every adjacent two rubber pads (16) are in contact, the middle of the two closed frames (15) is fixed to the distal ends of the two sliding frames (10), the inner walls of the two closed frames (15) are slidably connected to the outer surfaces of the web plates (8), and the outer surfaces of the two sliding frames (10) are slidably connected to the inner walls of the middle of the two web plates (8).

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