A high-temperature deformation-resistant bridge expansion joint structure

Abstract

This utility model discloses a high-temperature deformation-resistant bridge expansion joint structure, relating to the field of bridge engineering technology, aiming to solve the problem of traditional expansion joints being prone to failure at high temperatures. The structure includes two symmetrically arranged steel sections, forming an expansion joint between them and interlocking with rubber strips. The ends of the rubber strips are embedded in corresponding grooves in the steel sections. A heat dissipation plate is fixed to one side of each steel section, with ventilation slots inside. The heat dissipation plate is located below the rubber strips and evenly arranged along the expansion joint, with the front and rear ventilation slots corresponding to each other. The steel sections are made of Q355ND low-alloy high-strength steel, possessing both low-temperature toughness and high-temperature creep resistance. The rubber strips are made of EPDM rubber with added carbon black reinforcing agents and antioxidants, offering a wide temperature range and resistance to high-temperature aging. The heat dissipation plates are made of high thermal conductivity 6061-T6 aluminum alloy, which, together with the ventilation slots, allows for rapid heat dissipation through cross ventilation. This invention, through material optimization and structural design, achieves high-temperature deformation resistance, efficient heat dissipation, extended service life, and reduced maintenance costs, making it suitable for bridges in regions with varying temperature differences.

Description

Technical Field

[0001] This utility model relates to the field of bridge engineering technology, specifically a high-temperature deformation-resistant bridge expansion joint structure. Background Technology

[0002] During the long-term operation of bridge engineering, expansion joints, as a key component of the bridge structure, play a vital role in accommodating the expansion and contraction deformation of the bridge caused by temperature changes and loads. However, in high-temperature environments, traditional expansion joint structures often face problems such as plastic deformation of the steel and aging and failure of the rubber strips, leading to a decline in the sealing performance of the expansion joints, a shortened service life, and even affecting the overall structural safety of the bridge.

[0003] Traditional bridge expansion joints typically use ordinary steel profiles, and the rubber strips are mostly made of conventional rubber. In hot summer weather, bridge surface temperatures can reach 60-80℃, and even higher in some areas. Ordinary steel has poor creep resistance at these temperatures, making it prone to plastic deformation and causing damage to the steel structure. Simultaneously, traditional expansion joints lack effective heat dissipation mechanisms, causing heat to accumulate at the joints, further accelerating the damage to the steel profiles and rubber strips, increasing bridge maintenance costs and traffic risks.

[0004] Therefore, this utility model provides a high-temperature deformation-resistant bridge expansion joint structure to solve the above problems. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a high-temperature deformation-resistant bridge expansion joint structure, thus solving the aforementioned problems.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: a high-temperature deformation-resistant bridge expansion joint structure, comprising two steel sections, which are symmetrically arranged to form an expansion joint in the middle. A rubber strip is inserted between the two steel sections, and the left and right ends of the rubber strip are respectively inserted into the corresponding grooves inside the steel sections. A heat dissipation plate is fixedly installed on one side of each of the two steel sections, and the heat dissipation plate has ventilation slots inside.

[0007] Preferably, the heat sink is located below the rubber strip, and the two heat sinks on the left and right are symmetrical to each other.

[0008] Preferably, the heat dissipation plates are evenly arranged along the direction of the expansion joint, and the positions of the front and rear ventilation slots correspond to each other.

[0009] Preferably, anchor plates are fixedly installed on the opposite sides of the two steel sections, and anchor bars are fixedly installed on the sides of the anchor plates.

[0010] Preferably, the steel profile is made of Q355ND low-alloy high-strength structural steel, which has a yield strength of not less than 345MPa and can maintain good toughness in a low temperature environment of -40℃. It also has excellent high temperature creep resistance and can withstand the high temperature of 60-80℃ commonly encountered in bridge operation, thus preventing the steel profile from undergoing plastic deformation under high temperature loads.

[0011] Preferably, the rubber strip is made of ethylene propylene diene monomer (EPDM) rubber, and 2-3% carbon black reinforcing agent and 1.5-2% antioxidant are added inside the rubber strip. The operating temperature range of this material is -40℃ to 120℃. It has excellent high-temperature aging resistance and elastic recovery ability. It can still maintain sealing performance and structural integrity under high temperature exposure or repeated compression by vehicle load. The heat dissipation plate is made of 6061-T6 aluminum alloy. The thermal conductivity of this material is not less than 150W / (m・K). It is lightweight and corrosion resistant. It can quickly dissipate the heat at the bridge expansion joint through the ventilation channel, further improving the high-temperature deformation resistance effect. Beneficial effects

[0012] This invention provides a high-temperature deformation-resistant bridge expansion joint structure. Compared with the prior art, it has the following advantages: 1. This high-temperature deformation-resistant bridge expansion joint structure effectively solves the problem of high-temperature failure in traditional expansion joints, exhibiting excellent high-temperature deformation resistance and heat dissipation performance. The steel profile is made of Q355ND low-alloy high-strength steel, possessing excellent high-temperature creep resistance and capable of withstanding the high temperatures commonly encountered in bridge operation, preventing plastic deformation. The heat dissipation plate uses high thermal conductivity 6061-T6 aluminum alloy, combined with corresponding ventilation slots, to quickly absorb heat and dissipate it through cross ventilation, effectively preventing localized high-temperature accumulation. Compared to traditional structures, this significantly reduces the temperature in the expansion joint area, greatly reduces the risk of steel profile deformation, effectively ensures the structural stability of the expansion joint under high-temperature conditions, and further improves bridge driving safety and comfort.

[0013] 2. This high-temperature deformation-resistant bridge expansion joint structure uses EPDM rubber with a wide temperature range for the rubber strips. Carbon black reinforcing agents and antioxidants are added internally, which not only strengthens the mechanical properties of the rubber strips but also gives them outstanding high-temperature aging resistance, while maintaining excellent elastic recovery ability. This ensures a long-term good sealing effect and prevents rainwater leakage from damaging internal components. The materials of each component are highly compatible, and the anchor plates and anchor bars fit tightly together, enhancing the connection stability between the expansion joint and the main bridge structure. The heat dissipation plate itself has good corrosion resistance, resisting harsh environmental erosion. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a perspective view of the external structure of this utility model; Figure 2 This is a three-dimensional view of the disassembled structure of this utility model; Figure 3 This is a three-dimensional view of the bottom structure of this utility model; Figure 4 This is a three-dimensional view of the bottom split structure of this utility model.

[0016] In the diagram: 1. Steel section; 2. Anchor plate; 3. Anchor bar; 4. Rubber strip; 5. Heat dissipation plate; 6. Ventilation slot. Detailed Implementation

[0017] It should be noted that in the description of the embodiments of this application, the terms "front," "rear," "left," "right," "up," "down," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. The terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0018] The present application will be further described in detail below with reference to the accompanying drawings and embodiments.

[0019] Reference Figures 1 to 4 This application provides a high-temperature deformation resistant bridge expansion joint structure, including two steel sections 1, which are symmetrically arranged to form an expansion joint in the middle. A rubber strip 4 is inserted between the two steel sections 1, and the left and right ends of the rubber strip 4 are respectively inserted into the corresponding grooves inside the steel section 1. A heat dissipation plate 5 is fixedly installed on the opposite side of the two steel sections 1, and a ventilation groove 6 is opened inside the heat dissipation plate 5. To further optimize this technical solution, the heat dissipation plate 5 is located below the rubber strip 4, and the two heat dissipation plates 5 on the left and right are symmetrical to each other. This position setting allows the heat dissipation plate to fully contact the heat source area at the expansion joint without affecting the normal expansion and sealing function of the rubber strip, so as to carry out heat conduction and dissipation more efficiently. The heat dissipation plates 5 are evenly arranged along the direction of the expansion joint, and the front and rear ventilation slots 6 are positioned corresponding to each other. The evenly arranged heat dissipation plates can ensure that the heat in all parts of the expansion joint can be effectively dissipated, avoiding local heat accumulation. The corresponding ventilation slots form a continuous ventilation channel, which is conducive to air circulation and further improves heat dissipation efficiency. Anchor plates 2 are fixedly installed on the opposite sides of the two steel sections 1, and anchor bars 3 are fixedly installed on the sides of the anchor plates 2. The anchor plates and anchor bars can enhance the connection strength between the steel sections and the main structure of the bridge, and ensure that the expansion joint structure can be stably fixed on the bridge when subjected to vehicle loads, temperature deformation and other effects, so as to avoid displacement or loosening. Section 1 is made of Q355ND low-alloy high-strength structural steel. This material has a yield strength of not less than 345MPa and maintains good toughness even at -40℃. It also possesses excellent high-temperature creep resistance and can withstand the high temperatures commonly encountered in bridge operation (60-80℃), preventing plastic deformation of the steel section under high-temperature loads. This material not only meets the requirements for high-temperature deformation resistance but also possesses good low-temperature toughness, enabling the expansion joint structure to adapt to extreme temperature environments in different regions and expanding its application range. Rubber strip 4 is made of EPDM rubber, with 2-3% carbon black reinforcing agent and 1.5-2% antioxidant added internally. This material has a service temperature range of -40℃ to 120℃ and exhibits excellent high-temperature aging resistance and elastic recovery. Even under high-temperature exposure or repeated compression from vehicle loads, it maintains its sealing performance and structural integrity. The addition of carbon black reinforcing agent enhances the mechanical properties of the rubber strip, improving its tensile and compressive strength; the antioxidant effectively slows down the oxidative aging rate of the rubber strip under high-temperature environments, further extending its service life. The heat dissipation plate 5 is made of 6061-T6 aluminum alloy, which has a thermal conductivity of not less than 150 W / (m·K). It is lightweight and corrosion-resistant, allowing for rapid heat dissipation from the bridge expansion joint through the ventilation slots 6, further enhancing its high-temperature deformation resistance. The 6061-T6 aluminum alloy not only boasts high thermal conductivity and rapid heat dissipation, but also weighs significantly less than steel, effectively reducing the overall weight of the expansion joint structure and lessening the load on the main bridge structure. Simultaneously, its excellent corrosion resistance prevents corrosion damage to the heat dissipation plate under environmental factors such as rain and moisture, ensuring its long-term stable heat dissipation function.

[0020] Overall Installation: The assembled expansion joint structure is transported to the bridge construction site. According to the bridge design drawings, the expansion joint structure is installed in the pre-reserved gaps between the main bridge beam and the abutment or adjacent main beam. During installation, the position and angle of the anchor bars 3 are adjusted to ensure a good connection between the expansion joint structure and the main bridge structure, ensuring that the centerline of the expansion joint coincides with the centerline of the bridge, and that the height of the expansion joint is consistent with the bridge road surface height, avoiding any height difference that could affect driving comfort. Fixing and Pouring: After adjusting the position of the expansion joint structure, anchor bars 3 are welded and fixed to the steel bars in the main bridge structure to ensure the stability and reliability of the expansion joint structure. Then, high-strength concrete is poured to fill the gap between the expansion joint structure and the main bridge structure. During the pouring process, thorough vibration is required to ensure that the concrete is dense and free of air bubbles and voids. After pouring, the concrete surface is smoothed to make it flush with the bridge road surface. Commissioning and Testing: After the concrete reaches its design strength, the expansion joint structure undergoes commissioning and testing. First, the expansion joint's expansion performance is checked by simulating the bridge's expansion and contraction under temperature changes to observe whether the expansion joint can expand and contract smoothly without any jamming. Second, the sealing performance of the rubber strip 4 is checked by pouring water onto the expansion joint to observe whether there is any rainwater leakage. Finally, the heat dissipation effect of the heat dissipation plate 5 is checked. In hot weather, the temperature at the expansion joint is measured using a temperature detection instrument and compared with a traditional expansion joint structure to verify whether the heat dissipation effect of the heat dissipation plate 5 meets the design requirements. If any problems are found during commissioning and testing, they must be rectified promptly until all performance indicators of the expansion joint structure meet the design requirements and relevant standards.

[0021] Furthermore, all contents not described in detail in this specification are existing technologies known to those skilled in the art, and all electrical components mentioned in this document are powered by external power supply lines.

[0022] Working Principle: This high-temperature deformation-resistant bridge expansion joint structure achieves stable operation in high-temperature environments through a synergistic mechanism of "heat absorption - airflow heat dissipation - material damage resistance," with ventilation slots 6 being the core key for rapid heat dissipation. During daily bridge operation, when the temperature in the expansion joint area rises to 60-80℃ due to summer heat exposure, or when repeated vehicle loads generate additional heat, the heat dissipation plate 5, fixed to the inside of the steel section 1 and made of 6061-T6 high thermal conductivity aluminum alloy, quickly conducts and absorbs the heat accumulated in the steel section 1, rubber strip 4, and surrounding areas, preventing localized high-temperature concentration. The ventilation slots 6, as the core functional structure of the heat dissipation plate 5, are evenly distributed along the expansion joint direction with precise front-to-back alignment. This design effectively captures the naturally occurring crosswinds in the bridge's operating environment—crosswinds can flow unimpeded through all ventilation slots 6 along the expansion joint's extension direction, quickly carrying away the heat absorbed by the heat dissipation plate 5 during airflow, forming an efficient "crosswind-ventilation slot" heat dissipation path, significantly reducing the overall temperature of the expansion joint. Meanwhile, the Q355ND low-alloy high-strength steel used in the steel section 1 can resist high-temperature creep, and the modified EPDM rubber of the rubber strip 4 can resist high-temperature aging. The two, together with the heat dissipation function of the ventilation slot 6, effectively prevent the plastic deformation of the steel section and the aging and failure of the rubber strip, ensuring that the expansion joint maintains its structural integrity and performance in a high-temperature environment for a long time.

[0023] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0024] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-temperature deformation-resistant bridge expansion joint structure, comprising two steel sections (1), characterized in that: Two steel sections (1) are arranged symmetrically to form an expansion joint in the middle. A rubber strip (4) is inserted between the two steel sections (1). The left and right ends of the rubber strip (4) are respectively inserted into the corresponding grooves inside the steel section (1). A heat dissipation plate (5) is fixedly installed on the opposite side of the two steel sections (1). A ventilation slot (6) is opened inside the heat dissipation plate (5).

2. The high-temperature deformation-resistant bridge expansion joint structure according to claim 1, characterized in that: The heat sink (5) is located below the rubber strip (4), and the two heat sinks (5) on the left and right are symmetrical to each other.

3. The high-temperature deformation-resistant bridge expansion joint structure according to claim 1, characterized in that: The heat dissipation plates (5) are evenly arranged along the direction of the expansion joint, and the positions of the front and rear ventilation slots (6) correspond to each other.

4. The high-temperature deformation-resistant bridge expansion joint structure according to claim 1, characterized in that: Anchor plates (2) are fixedly installed on the opposite sides of the two steel sections (1), and anchor bars (3) are fixedly installed on the side of the anchor plates (2).

5. A high-temperature deformation-resistant bridge expansion joint structure according to claim 1, characterized in that: The steel section (1) is made of Q355ND low alloy high strength structural steel. The yield strength of this material is not less than 345MPa, and it can still maintain good toughness in the low temperature environment of -40℃. At the same time, it has excellent high temperature creep resistance and can withstand the common high temperature of bridge operation of 60-80℃, thus avoiding plastic deformation of the steel section under high temperature load.

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