A simple expansion joint structure suitable for steel beams of pedestrian bridge stairways

Abstract

This utility model discloses a simple expansion joint structure suitable for the steel beams of pedestrian bridge stairways, belonging to the technical field of bridge expansion joint structures. It includes a fixing device, a sliding device, and a waterproofing device installed between the steel beams of the pedestrian bridge stairway and the concrete abutment. The top of the steel beams of the pedestrian bridge stairway is welded with pre-embedded reinforcing bars N2, and the concrete abutment is pre-embedded with reinforcing bars N3. C40 steel fiber reinforced concrete is poured onto the top of both the steel beams and the concrete abutment, and the top of the C40 steel fiber reinforced concrete is coated with a beneficial adhesive. The fixing device includes G3 and G4 fixing steel plates, the sliding device includes a G5 sliding steel plate, and the top of the G5 sliding steel plate is coated with epoxy structural adhesive. The waterproofing device includes a rubber waterstop and polyurethane asphalt filler. This utility model discloses a simple expansion joint structure with good anti-slip performance while improving sealing and durability.

Description

Technical Field

[0001] This utility model relates to the technical field of bridge expansion joint structures, and in particular to a simple expansion joint structure suitable for steel beams of pedestrian bridge stairways. Background Technology

[0002] The steel beams of the pedestrian overpass staircase are relatively short and have a small amount of expansion and contraction. If conventional steel expansion joints are used, the surface of the steel will have poor anti-slip properties after rain, which may cause danger to pedestrians. Debris may also accumulate in the gaps between the steel beams, causing the expansion joints to fail. In addition, steel expansion joints will make the paved surface at the expansion joint location inconsistent with the surrounding granite paving, affecting the overall landscape effect of the pedestrian overpass staircase paving. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, the technical problem to be solved by this utility model is to propose a simple expansion joint structure with good anti-slip performance, while improving sealing and durability.

[0004] To achieve this objective, the present invention adopts the following technical solution: This utility model provides a simple expansion joint structure suitable for the steel beams of pedestrian bridge stairways, including a fixing device, a sliding device, and a waterproof device set between the steel beams of the pedestrian bridge stairways and the concrete abutment. The top of the steel beams of the pedestrian bridge stairways is welded with a pre-embedded steel bar N2, and the concrete abutment is pre-embedded with a steel bar N3. C40 steel fiber concrete is poured on the top of the steel beams of the pedestrian bridge stairways and the concrete abutment, and the top of the C40 steel fiber concrete is coated with beneficial mortar. The fixing device includes a G3 fixing steel plate and a G4 fixing steel plate. The G3 fixing steel plate is connected to the pedestrian bridge stairway steel beam via a pre-embedded reinforcing bar N2, and the G4 fixing steel plate is connected to the concrete bridge abutment via a reinforcing bar N3. The sliding device includes a G5 sliding steel plate. One end of the G5 sliding steel plate is welded to the G4 fixing steel plate, and the other end is placed on the G3 fixing steel plate. The top of the G5 sliding steel plate is coated with epoxy structural adhesive. The waterproof device includes a rubber waterstop and a polyurethane asphalt filler. The rubber waterstop is pre-embedded between the pedestrian bridge stairway steel beam and the concrete bridge abutment, and the polyurethane asphalt filler is placed at the end of the G5 sliding steel plate and at the contact point with the rubber waterstop.

[0005] The preferred technical solution of this utility model is that the G3 fixing steel plate is welded to the pre-embedded reinforcing bar N2, and the G4 fixing steel plate is welded to the reinforcing bar N3.

[0006] The preferred technical solution of this utility model is that a lychee-finished granite is laid between the top of the adhesive mortar and the epoxy structural adhesive.

[0007] The preferred technical solution of this utility model is that the thickness of the C40 steel fiber concrete is 7cm, and the C40 steel fiber concrete is laid at a position that connects with the corresponding positions of the G3 fixing steel plate and the G4 fixing steel plate.

[0008] The preferred technical solution of this utility model is that the polyurethane asphalt filler is respectively disposed at the end of the G5 sliding steel plate near the G3 fixed steel plate, and between the G3 fixed steel plate and the G4 fixed steel plate.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention, through the design of a sliding device, can effectively adapt to the relative displacement between the steel beams of the pedestrian bridge stairway and the concrete abutment caused by various factors, avoiding structural damage caused by rigid connections and ensuring the safe use of the pedestrian bridge. Furthermore, by using a fixing device to firmly connect the expansion joint structure to the steel beams of the pedestrian bridge stairway and the concrete abutment, it ensures the stability of the entire structure under load and displacement changes, improving the overall structural safety of the pedestrian bridge. The connection and installation methods of the various components of the expansion joint structure are simple and easy to implement, requiring no complex construction equipment or processes, reducing construction difficulty and cost, and improving construction efficiency. This utility model waterproof device uses a combination of rubber waterstop and polyurethane asphalt filler to block water infiltration through multiple lines of defense, effectively protecting the steel beams and concrete structure and extending the service life of the pedestrian bridge; the lychee-textured granite paved on top not only provides a good walking surface for pedestrians, but is also beautiful and elegant, and in harmony with the surrounding environment. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of a simplified expansion joint structure provided in a specific embodiment of this utility model; Figure 2 This is provided in a specific embodiment of the present utility model. Figure 1 Enlarged schematic diagram of the structure at point A in the middle; Figure 3 This is a top view of a simplified expansion joint structure provided in a specific embodiment of this utility model.

[0011] The attached diagram lists the components represented by each number as follows: 1. Pedestrian bridge staircase steel beams; 11. Embedded steel reinforcement N2; 2. Concrete bridge abutments; 21. Steel reinforcement N3; 3. C40 steel fiber reinforced concrete; 4. G3 fixed steel plate; 5. G4 fixed steel plate; 6. G5 sliding steel plate; 61. Epoxy structural adhesive; 7. Rubber waterstop; 8. Polyurethane asphalt filler; 9. Adhesive mortar; 10. Litchi-grain granite. Detailed Implementation

[0012] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0013] A simple expansion joint structure suitable for pedestrian bridge staircase steel beams includes a fixing device, a sliding device, and a waterproofing device installed between the pedestrian bridge staircase steel beam 1 and the concrete abutment 2. The top of the pedestrian bridge staircase steel beam 1 is welded with a pre-embedded steel bar N211, and the concrete abutment 2 is pre-embedded with a steel bar N321. C40 steel fiber concrete 3 is poured on the top of the pedestrian bridge staircase steel beam 1 and the concrete abutment 2, and the top of the C40 steel fiber concrete 3 is coated with beneficial mortar 9. The fixing device includes a G3 fixing steel plate 4 and a G4 fixing steel plate 5. The G3 fixing steel plate 4 is connected to the pedestrian bridge stairway steel beam 1 through a pre-embedded steel bar N211. The G4 fixing steel plate 5 is connected to the concrete bridge abutment 2 through a steel bar N321. The sliding device includes a G5 sliding steel plate 6. One end of the G5 sliding steel plate 6 is welded to the G4 fixing steel plate 5, and the other end is placed on the G3 fixing steel plate 4. The top of the G5 sliding steel plate 6 is coated with epoxy structural adhesive 61. The waterproof device includes a rubber waterstop 7 and a polyurethane asphalt filler 8. The rubber waterstop 7 is pre-embedded between the pedestrian bridge stairway steel beam 1 and the concrete bridge abutment 2. The polyurethane asphalt filler 8 is placed at the end of the G5 sliding steel plate 6 and at the contact point with the rubber waterstop 7. The top of the epoxy mortar 9 and the epoxy structural adhesive 61 is covered with bush-hammered granite 10.

[0014] During construction, firstly, pre-embedded steel bars N211 are welded onto the steel beams 1 of the pedestrian bridge stairway, and steel bars N321 are directly pre-embedded onto the concrete abutment 2. Then, rubber waterstops 7 are pre-embedded. G3 fixing steel plates 5 and G4 fixing steel plates 5 are welded to the pre-embedded steel bars N211 and N321 respectively. Then, C40 steel fiber concrete 3 is poured. Then, polyurethane asphalt filler 8 is poured onto the rubber waterstops 7. One end of G5 sliding steel plate 6 is welded to G4 fixing steel plate 5, and the other end is placed on G3 fixing steel plate 4. Finally, C40 steel fiber concrete 3 is coated with epoxy mortar 9, and G5 sliding steel plate 6 is coated with epoxy structural adhesive 61. Finally, lychee-finished granite 10 is laid, and polyurethane asphalt filler 8 is poured into the gaps at the ends of G5 sliding steel plate 6.

[0015] When the relative displacement between the pedestrian bridge staircase steel beam 1 and the concrete abutment 2 occurs due to factors such as temperature changes, the sliding device comes into play. One end of the G5 sliding steel plate 6 is welded and fixed to the G4 fixed steel plate 5, while the other end slides freely on the G3 fixed steel plate 4, thus adapting to the relative displacement between the two and preventing structural damage due to stress concentration. In the waterproofing device, the rubber waterstop 7 effectively blocks most of the water flow from seeping through the structural gaps, while the polyurethane asphalt filler 8 further fills the gaps, enhancing the waterproofing effect and preventing moisture from entering the interior of the structure and causing corrosion to the steel beams and concrete. The fixing device is connected to the G3 fixed steel plate 4 and the G4 fixed steel plate 5. The fixed steel plate 5 firmly connects the structure to the pedestrian bridge staircase steel beam 1 and the concrete abutment 2, ensuring the stability of the entire expansion joint structure and enabling the sliding device and waterproof device to work normally. The C40 steel fiber concrete 3 has high strength and toughness, which can withstand the load of pedestrians, and at the same time protects the top of the pedestrian bridge staircase steel beam 1 and the concrete abutment 2. The adhesive mortar 9 and epoxy structural adhesive 61 serve as an adhesive to firmly bond the bush-hammered granite 10 to the lower structure, and also have a certain degree of waterproof performance. The bush-hammered granite 10 provides pedestrians with a flat and non-slip walking surface.

[0016] This application achieves the adaptation of the expansion joint structure to relative displacement, effective waterproofing, and stable connection with steel beams and abutments through the synergistic action of fixing devices, sliding devices, and waterproofing devices. This lays the foundation for the normal operation and performance of the entire structure. Each device works in concert with the others and is indispensable, jointly ensuring the basic functions and performance of the expansion joint structure.

[0017] As a possible implementation of this solution, preferably, the G3 fixing steel plate 4 is welded to the pre-embedded reinforcing bar N211, and the G4 fixing steel plate 5 is welded to the reinforcing bar N321. This ensures a firm connection between the G3 fixing steel plate 4, the G4 fixing steel plate 5 and the pedestrian bridge staircase steel beam 1 and the concrete bridge abutment 2, improving the stability and reliability of the fixing device. This ensures that the fixing device will not loosen or be damaged when the structure is displaced or subjected to load, thereby ensuring the normal operation of the entire expansion joint structure.

[0018] As one possible implementation of this solution, preferably, the thickness of the C40 steel fiber concrete 3 is 7cm, and the C40 steel fiber concrete 3 is laid at a position that connects with the corresponding positions of the G3 fixing steel plate 4 and the G4 fixing steel plate 5.

[0019] The 7cm thickness ensures that the concrete has sufficient strength and load-bearing capacity to meet the requirements of crowd loads. The connection design with the corresponding positions of G3 fixed steel plate 4 and G4 fixed steel plate 5 ensures the integrity of the structure, avoids stress concentration and structural damage caused by improper connection, and improves the stability and load-bearing performance of the entire expansion joint structure.

[0020] As a possible implementation of this solution, preferably, the polyurethane asphalt filler 8 is respectively disposed at the end of the G5 sliding steel plate 6 near the end of the G3 fixed steel plate 4, and between the G3 fixed steel plate 4 and the G4 fixed steel plate 5.

[0021] It can specifically seal the gaps between the ends of the sliding device and between the G3 fixed steel plate 4 and the G4 fixed steel plate 5, further enhancing the waterproof effect of the waterproof device, preventing water from penetrating from these key parts, effectively protecting the steel beams and concrete inside the structure, and extending the service life of the structure.

[0022] This utility model has been described through preferred embodiments. Those skilled in the art will understand that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. This utility model is not limited to the specific embodiments disclosed herein; other embodiments falling within the scope of the claims of this application are all within the protection scope of this utility model.

Claims

1. A simple expansion joint structure suitable for steel beams of pedestrian bridge stairways, characterized in that: Includes a fixing device, a sliding device and a waterproofing device installed between the pedestrian bridge stairway steel beam (1) and the concrete abutment (2). The top of the pedestrian bridge stairway steel beam (1) is welded with a pre-embedded steel bar N2 (11), and the concrete abutment (2) is pre-embedded with a steel bar N3 (21). The top of the pedestrian bridge stairway steel beam (1) and the concrete abutment (2) is filled with C40 steel fiber concrete (3), and the top of the C40 steel fiber concrete (3) is coated with beneficial mortar (9). The fixing device includes a G3 fixing steel plate (4) and a G4 fixing steel plate (5). The G3 fixing steel plate (4) is connected to the pedestrian bridge stairway steel beam (1) through a pre-embedded steel bar N2 (11). The G4 fixing steel plate (5) is connected to the concrete bridge abutment (2) through a steel bar N3 (21). The sliding device includes a G5 sliding steel plate (6). One end of the G5 sliding steel plate (6) is welded to the G4 fixing steel plate (5), and the other end is placed on the G3 fixing steel plate (4). The top of the G5 sliding steel plate (6) is coated with epoxy structural adhesive (61). The waterproof device includes a rubber waterstop (7) and a polyurethane asphalt filler (8). The rubber waterstop (7) is pre-embedded between the pedestrian bridge stairway steel beam (1) and the concrete bridge abutment (2). The polyurethane asphalt filler (8) is set at the end of the G5 sliding steel plate (6) and at the contact point with the rubber waterstop (7).

2. The simplified expansion joint structure for pedestrian bridge staircase steel beams according to claim 1, characterized in that: The G3 fixed steel plate (4) is welded to the pre-embedded steel bar N2 (11), and the G4 fixed steel plate (5) is welded to the steel bar N3 (21).

3. A simple expansion joint structure for pedestrian bridge staircase steel beams according to claim 1, characterized in that: The top of the adhesive mortar (9) and the epoxy structural adhesive (61) is covered with lychee-faced granite (10).

4. A simple expansion joint structure for pedestrian bridge staircase steel beams according to claim 1, characterized in that: The thickness of the C40 steel fiber concrete (3) is 7cm, and the C40 steel fiber concrete (3) is laid at a position that connects with the corresponding positions of the G3 fixed steel plate (4) and the G4 fixed steel plate (5).

5. A simple expansion joint structure for pedestrian bridge staircase steel beams according to claim 1, characterized in that: The polyurethane asphalt filler (8) is respectively disposed at the end of the G5 sliding steel plate (6) near the end of the G3 fixed steel plate (4), and between the G3 fixed steel plate (4) and the G4 fixed steel plate (5).

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