Highway engineering bridge expansion joint structure

Abstract

The utility model discloses a highway engineering bridge expansion joint structure, its characterized in that, including the expansion joint of bridge abutment back wall and bridge deck precast beam upper portion, bridge abutment back wall and bridge deck precast beam upper portion have poured steel fiber reinforced concrete respectively, expansion joint is installed between two groups steel fiber reinforced concrete. The utility model discloses in bridge abutment back wall and bridge deck precast beam upper portion have poured steel fiber reinforced concrete respectively, expansion joint is installed between two groups steel fiber reinforced concrete, relative to traditional implementation mode, can improve the strength and carrying capacity of expansion joint structure, and the crack resistance, the toughness and the impact resistance of improvement simultaneously, improve the fatigue resistance and improve the convenience of construction.

Description

Technical Field

[0001] This utility model relates to the field of bridge expansion joints, specifically to a structure for a highway bridge expansion joint. Background Technology

[0002] The current method for installing bridge expansion joints involves slotting, which uses cutting equipment such as a cutting machine to cut along marked lines on the bridge deck. The cutting depth should meet design requirements, generally cutting to the bottom of the pre-reserved slot. However, this cutting process is prone to several drawbacks, easily damaging the surrounding concrete structure. After cutting, the concrete in the slot is removed using a pneumatic hammer or other suitable tools, which can also easily cause excessive damage or cracks. Installing the expansion joint device involves hoisting it to the installation location and positioning it according to design requirements. Generally, the centerline of the expansion joint device should coincide with the centerline of the bridge expansion joint, and the anchoring steel bars at both ends should correspond to the pre-reserved steel bars in the bridge structure. Temporary fixing measures, such as clamps or spot welding, are used to secure the expansion joint device within the pre-reserved slot, ensuring its accurate and secure positioning. Therefore, the existing expansion joints, which are directly installed on the bridge deck, have many drawbacks in their implementation structure. First, they are prone to damaging the surrounding concrete structure. Second, uneven installation is common. Third, because the existing expansion joints are directly installed on the bridge deck, they can easily affect the structural strength, load-bearing capacity, crack resistance, and impact resistance of the surrounding structure. Utility Model Content

[0003] Therefore, in order to overcome the above-mentioned shortcomings, this utility model provides a structure for an expansion joint of a highway bridge. Steel fiber reinforced concrete is poured on the abutment back wall and the upper part of the precast beam of the bridge deck, and the expansion joint is installed between the two sets of steel fiber reinforced concrete. Compared with the traditional implementation method, it can improve the strength and load-bearing capacity of the expansion joint structure, while enhancing crack resistance, improving toughness and impact resistance, improving fatigue resistance, and improving construction convenience.

[0004] This utility model is implemented as follows: a structure for an expansion joint of a highway bridge is constructed, characterized in that it includes an expansion joint located on the back wall of the abutment and the upper part of the precast beam of the bridge deck, wherein steel fiber reinforced concrete is poured on the back wall of the abutment and the upper part of the precast beam of the bridge deck, and the expansion joint is installed between the two sets of steel fiber reinforced concrete.

[0005] According to the highway engineering bridge expansion joint structure of this utility model, the feature is that: steel fiber reinforced concrete is poured on the corresponding 10cm cast-in-place bridge deck through Φ16 pre-embedded steel bars and Φ16 longitudinal steel bars; the Φ16 longitudinal steel bars are in two sets, upper and lower, with the upper Φ16 longitudinal steel bars pre-embedded in the steel fiber reinforced concrete and the lower Φ16 longitudinal steel bars pre-embedded in the corresponding abutment back wall and bridge deck precast beam, and the lower end of the Φ16 pre-embedded steel bars has a hook end that extends into the corresponding abutment back wall and bridge deck precast beam, and the hook end cooperates with the corresponding lower Φ16 longitudinal steel bar.

[0006] According to the highway engineering bridge expansion joint structure of this utility model, the feature is that: the steel fiber concrete ends of the abutment back wall and the upper part of the precast beam of the bridge deck are respectively formed with 20 cm platforms, and the two ends of the expansion joint extend into and are placed on the platforms.

[0007] According to the highway engineering bridge expansion joint structure of this utility model, the feature is that the concrete poured in the expansion joint section is steel fiber concrete, and the steel fiber concrete content is 90 kg / m² concrete.

[0008] According to the highway engineering bridge expansion joint structure of this utility model, the feature is that: pre-embedded steel bars are installed at the beam body and abutment cap where the expansion joint is set; after the expansion joint is adjusted and installed, N2 steel bars are passed through it in the transverse direction of the bridge and welded to the paving steel bars and the pre-embedded steel bars.

[0009] The expansion joint structure for highway engineering bridges according to this utility model is characterized in that: the expansion joint is leveled with the road surface, and the anchor bars are welded firmly to the transverse bars and the pre-embedded bars.

[0010] This utility model has the following advantages: It provides a bridge expansion joint structure for highway engineering, including an expansion joint located between the abutment back wall and the upper part of the precast bridge deck beam made of steel fiber reinforced concrete; after pouring steel fiber reinforced concrete on the bridge abutment back wall and the upper part of the precast bridge deck beam, the following benefits are achieved:

[0011] (1) Improve structural strength and load-bearing capacity: The addition of steel fibers can effectively enhance the tensile, bending and shear strength of concrete. In bridge structures, the abutment back wall and the precast beam of the bridge deck bear various external forces such as vehicle loads and wind loads. Steel fiber reinforced concrete can better resist these external forces, reduce the possibility of structural deformation and cracking, thereby improving the overall load-bearing capacity and stability of the bridge and extending the service life of the bridge.

[0012] (2) Enhanced crack resistance: Concrete is prone to shrinkage cracks during setting and use, while steel fibers can form a randomly distributed reinforcement system inside the concrete, inhibiting the generation and development of cracks. At the abutment back wall and precast beams of the bridge deck, cracking problems are more prominent due to the complexity of the structure and stress concentration. The application of steel fiber reinforced concrete can effectively improve this situation and enhance the impermeability and durability of the structure.

[0013] (3) Improved toughness and impact resistance: Bridge structures need to withstand impact loads from vehicles and dynamic loads such as possible seismic forces. Steel fiber reinforced concrete has good toughness and can absorb and dissipate energy. When subjected to impact or vibration, steel fibers can prevent the rapid propagation of cracks inside the concrete, enabling the structure to withstand large deformations before failure without sudden brittle failure, thus improving the safety and reliability of the bridge structure.

[0014] (4) Improve fatigue resistance: During long-term use, bridges are subjected to repeated vehicle loads, which can easily lead to fatigue failure. The steel fibers in steel fiber reinforced concrete can share the fatigue stress borne by the concrete, delay the appearance and propagation of fatigue cracks, thereby improving the fatigue resistance of the bridge structure and ensuring that the bridge can operate safely and stably within its design service life.

[0015] (5) Easy to construct: Steel fiber reinforced concrete has good workability and good compressibility. During the pouring process, it can fill the formwork space well, which is convenient for vibration and compaction and ensures the quality of concrete molding. At the same time, compared with some other reinforcing materials or complex construction processes, the construction of steel fiber reinforced concrete is relatively simple, which does not require special construction equipment and technology, thus improving construction efficiency and shortening the construction cycle.

[0016] In this application, the steel fiber reinforced concrete ends of the abutment back wall and the upper part of the precast bridge deck beams are respectively provided with 20 cm platforms. The two ends of the expansion joint extend into and rest on these platforms. Another advantage of this implementation is that it enhances the structural connection stability of the expansion joint: the 20 cm platforms at the ends of the steel fiber reinforced concrete of the abutment back wall and the upper part of the precast bridge deck beams provide a stable and reliable support platform for the expansion joint. The fact that the two ends of the expansion joint extend into and rest on these platforms ensures that when the bridge expands or contracts due to factors such as temperature changes and vehicle loads, the expansion joint maintains a stable connection with the abutment back wall and the precast bridge deck beams, effectively preventing excessive displacement of the expansion joint, ensuring the overall stability of the bridge structure, and extending the service life of the bridge.

[0017] Improved Construction Ease: This specific platform design allows for more precise and convenient positioning of expansion joints during installation. Construction workers can directly align both ends of the expansion joint with the platform, reducing complex positioning procedures, improving construction efficiency, lowering construction difficulty, and accelerating the overall bridge construction progress. Optimized Waterproofing and Drainage: The 20cm platform provides some protection and shielding for the ends of the expansion joint, reducing the direct entry of rainwater and debris into the connection gaps between the expansion joint and the abutment back wall and precast bridge beams, lowering the risk of structural performance degradation due to water corrosion at the connection points. Furthermore, a reasonable drainage slope on the platform can better guide rainwater out, further optimizing the waterproofing and drainage function of the bridge expansion joint area. Enhanced Durability: Steel fiber reinforced concrete itself has high strength and crack resistance. Combined with the 20cm platform structure, it effectively disperses the stress transmitted by the expansion joint, reducing damage to the abutment back wall and precast bridge beams caused by stress concentration. The expansion joint is firmly placed on the platform, avoiding damage to the surrounding structure from frequent displacement impacts, thereby improving the durability of the entire bridge structure in the expansion joint area. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of the expansion joint installation in this application;

[0019] Figure 2 This is the plan view of the expansion joint installation in this application. Detailed Implementation

[0020] The following will be combined with the appendix Figures 1-2 This utility model will be described in detail, and the technical solutions in the embodiments of this utility model will be clearly and completely described. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0021] Example 1: This utility model provides an improved structure for a highway bridge expansion joint, such as... Figures 1-2 As shown, it can be implemented in the following manner; including the expansion joint 4 located between the abutment back wall 1 and the upper part of the precast beam 2 of the bridge deck and the steel fiber concrete 3; after pouring steel fiber concrete on the upper part of the abutment back wall and the precast beam of the bridge deck, it has the following benefits: (1) Improve the structural strength and bearing capacity: The addition of steel fibers can effectively enhance the tensile, bending and shear strength of concrete. In the bridge structure, the abutment back wall and the precast beam of the bridge deck bear various external forces such as vehicle load and wind load. Steel fiber concrete can better resist these external forces, reduce the possibility of structural deformation and cracking, thereby improving the overall bearing capacity and stability of the bridge and extending the service life of the bridge.

[0022] (2) Enhanced crack resistance: Concrete is prone to shrinkage cracks during setting and use, while steel fibers can form a randomly distributed reinforcement system inside the concrete, inhibiting the generation and development of cracks. At the abutment back wall and precast beams of the bridge deck, cracking problems are more prominent due to the complexity of the structure and stress concentration. The application of steel fiber reinforced concrete can effectively improve this situation and enhance the impermeability and durability of the structure.

[0023] (3) Improved toughness and impact resistance: Bridge structures need to withstand impact loads from vehicles and dynamic loads such as possible seismic forces. Steel fiber reinforced concrete has good toughness and can absorb and dissipate energy. When subjected to impact or vibration, steel fibers can prevent the rapid propagation of cracks inside the concrete, enabling the structure to withstand large deformations before failure without sudden brittle failure, thus improving the safety and reliability of the bridge structure.

[0024] (4) Improve fatigue resistance: During long-term use, bridges are subjected to repeated vehicle loads, which can easily lead to fatigue failure. The steel fibers in steel fiber reinforced concrete can share the fatigue stress borne by the concrete, delay the appearance and propagation of fatigue cracks, thereby improving the fatigue resistance of the bridge structure and ensuring that the bridge can operate safely and stably within its design service life.

[0025] (5) Easy to construct: Steel fiber reinforced concrete has good workability and good compressibility. During the pouring process, it can fill the formwork space well, which is convenient for vibration and compaction and ensures the quality of concrete molding. At the same time, compared with some other reinforcing materials or complex construction processes, the construction of steel fiber reinforced concrete is relatively simple, which does not require special construction equipment and technology, thus improving construction efficiency and shortening the construction cycle.

[0026] like Figure 1 As shown, in the implementation of this application, steel fiber reinforced concrete 3 is poured onto the corresponding 10cm cast-in-place bridge deck 8 through Φ16 pre-embedded steel bars and Φ16 longitudinal steel bars; the Φ16 longitudinal steel bars are in two sets, upper and lower, with the upper Φ16 longitudinal steel bars pre-embedded in the steel fiber reinforced concrete 3 and the lower Φ16 longitudinal steel bars pre-embedded in the corresponding abutment back wall 1 and bridge deck precast beam 2. The lower end of the Φ16 pre-embedded steel bars has a hook end that extends into the corresponding abutment back wall 1 and bridge deck precast beam 2, and the hook end cooperates with the corresponding lower Φ16 longitudinal steel bar.

[0027] like Figure 1As shown, in this application, the ends of the steel fiber reinforced concrete 3 on the upper part of the abutment back wall 1 and the precast bridge deck beam 2 are respectively provided with 20 cm platforms 7. The two ends of the expansion joint extend into and rest on these platforms. Another advantage of this implementation is that it enhances the structural connection stability of the expansion joint: the 20 cm platforms at the ends of the steel fiber reinforced concrete on the abutment back wall and the precast bridge deck beam provide a stable and reliable support platform for the expansion joint. The fact that the two ends of the expansion joint extend into and rest on the platforms ensures that when the bridge expands or contracts due to factors such as temperature changes and vehicle loads, the expansion joint maintains a stable connection with the abutment back wall and the precast bridge deck beam, effectively preventing excessive displacement deviation of the expansion joint, ensuring the overall stability of the bridge structure, and extending the service life of the bridge.

[0028] Improved Construction Ease: This specific platform design allows for more precise and convenient positioning of expansion joints during installation. Construction workers can directly align both ends of the expansion joint with the platform, reducing complex positioning procedures, improving construction efficiency, lowering construction difficulty, and accelerating the overall bridge construction progress. Optimized Waterproofing and Drainage: The 20cm platform provides some protection and shielding for the ends of the expansion joint, reducing the direct entry of rainwater and debris into the connection gaps between the expansion joint and the abutment back wall and precast bridge beams, lowering the risk of structural performance degradation due to water corrosion at the connection points. Furthermore, a reasonable drainage slope on the platform can better guide rainwater out, further optimizing the waterproofing and drainage function of the bridge expansion joint area. Enhanced Durability: Steel fiber reinforced concrete itself has high strength and crack resistance. Combined with the 20cm platform structure, it effectively disperses the stress transmitted by the expansion joint, reducing damage to the abutment back wall and precast bridge beams caused by stress concentration. The expansion joint is firmly placed on the platform, avoiding damage to the surrounding structure from frequent displacement impacts, thereby improving the durability of the entire bridge structure in the expansion joint area.

[0029] In the implementation of this application, the concrete poured for the expansion joint section is steel fiber concrete, and the amount of steel fiber concrete added is 90 kg / m² concrete.

[0030] When this application is implemented, pre-embedded steel bars are installed in the beam body and abutment cap where expansion joints are set. After the expansion joint is adjusted and installed, longitudinal steel bars are threaded through it in the transverse direction of the bridge and welded to the pavement steel bars and pre-embedded steel bars.

[0031] The expansion joints are leveled with the road surface, and the anchor bars, transverse bars, and embedded bars are welded securely.

[0032] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A structure for an expansion joint in a highway bridge, characterized in that; The expansion joint (4) is located on the upper part of the bridge abutment back wall (1) and the bridge deck precast beam (2). The upper part of the bridge abutment back wall (1) and the bridge deck precast beam (2) are respectively cast with steel fiber concrete (3). The expansion joint (4) is installed between the two sets of steel fiber concrete (3). Steel fiber reinforced concrete (3) is poured on the corresponding 10cm cast-in-place bridge deck (8) by Φ16 pre-embedded steel bars (5) and Φ16 longitudinal steel bars (6); the Φ16 longitudinal steel bars are in two sets, the upper Φ16 longitudinal steel bars are pre-embedded in the steel fiber reinforced concrete (3), and the lower Φ16 longitudinal steel bars are pre-embedded in the corresponding abutment back wall (1) and bridge deck precast beam (2). The lower end of the Φ16 pre-embedded steel bars has a hook end that extends into the corresponding abutment back wall (1) and bridge deck precast beam (2), and the hook end cooperates with the corresponding lower Φ16 longitudinal steel bar.

2. The structure of the expansion joint for highway bridges according to claim 1, characterized in that; The steel fiber reinforced concrete (3) at the top of the bridge abutment back wall (1) and the precast beam (2) of the bridge deck forms a 20 cm platform (7) at the corresponding ends, and the expansion joints extend into and are placed on the platform.

3. The structure of the expansion joint for highway bridges according to claim 1, characterized in that; Pre-embedded steel bars are installed on the beams and abutment caps where expansion joints are located. After the expansion joints are adjusted and installed, N2 steel bars are threaded through them along the transverse direction of the bridge and welded to the pavement steel bars and pre-embedded steel bars.

4. The structure of the expansion joint for highway bridges according to claim 1, characterized in that; The expansion joints are leveled with the road surface, and the anchor bars, transverse bars, and embedded bars are welded securely.

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