Bridge expansion joint seal and bridge expansion joint device
By incorporating multiple repair agents and covering them with a protective coating into the bridge expansion joint sealant, a self-healing function is achieved, solving the problem of easy aging and cracking of rubber sealing strips, extending service life and reducing maintenance costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 科顺建筑修缮技术有限公司
- Filing Date
- 2025-07-30
- Publication Date
- 2026-07-21
AI Technical Summary
The rubber sealing strips of existing bridge expansion joint devices have a short lifespan and are easily affected by natural environment to age and crack, leading to leakage and corrosion of metal structures, thus increasing maintenance costs.
A bridge expansion joint seal is designed, which adopts a hollow seal body with multiple repair agents inside. When cracks occur, the agents mix to form a repair agent, which repairs the cracks on its own. A protective coating is applied to the outer surface to improve weather resistance.
Extend the lifespan of seals, reduce the risk of leakage and maintenance costs, ensure that repairs can be completed while traffic is open, avoid road closures and congestion, and improve structural reliability and economy.
Smart Images
Figure CN224531438U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of bridge engineering technology, specifically relating to bridge expansion joint seals and bridge expansion joint devices. Background Technology
[0002] Expansion joints on highway bridges are specialized structures installed during bridge construction to accommodate structural deformation caused by temperature changes and concrete shrinkage. They enable bidirectional free expansion and contraction of the bridge while ensuring smooth driving and meeting waterproofing and dustproofing requirements. Currently, the mainstream shallow-buried expansion joint system employs a rubber-metal composite structure, primarily composed of embedded steel plates and rubber sealing strips. Bridge displacement is transmitted through a metal anchoring system, while the compression and rebound characteristics of the rubber sealing strips provide sealing and buffering. However, existing rubber sealing strips have a relatively short lifespan due to prolonged exposure to natural environments such as ultraviolet radiation, rainwater, freeze-thaw cycles, and salt corrosion. This causes the rubber sealing strips to harden and crack, creating leakage points in the expansion joint and subsequently leading to corrosion of the internal metal structure, resulting in a significant increase in later maintenance costs. Utility Model Content
[0003] In view of at least one of the above-mentioned defects or deficiencies in the prior art, this application provides a bridge expansion joint seal and a bridge expansion joint device, which can realize automatic repair of the seal, effectively extend the service life of the seal, reduce the risk of leakage and maintenance costs.
[0004] To achieve the above objectives, this application provides a bridge expansion joint sealant, comprising:
[0005] The sealing body has a mixing cavity and includes a cavity partitioning structure that divides the mixing cavity into multiple cavity partitions;
[0006] Multiple repair formulations, each stored separately in one of the respective cavity partitions; and
[0007] A protective coating is applied to the outer surface of the seal body.
[0008] In some embodiments, the sealing element body is a rubber molded part.
[0009] In some embodiments, the cavity partition includes a first partition and a second partition, and the repair formulation includes an isocyanate formulation stored in the first partition and an amino formulation stored in the second partition.
[0010] In some embodiments, the protective coating is a fluorosilicone resin coating.
[0011] In some embodiments, the sealing body has a plurality of mixing cavities, which are arranged sequentially at intervals along the width direction of the sealing body.
[0012] In some embodiments, the cavity partition structure is formed as a tubular partition structure with an annular cross-section, and two adjacent cavity partitions are located in the radial inner region and the radial outer region of the cavity partition structure, respectively.
[0013] In some embodiments, the cavity partition structure is formed as a sheet-like partition structure with a linear cross-section, and two adjacent cavity partitions are located on opposite sides of the cavity partition structure.
[0014] In some embodiments, the sealing body is provided with a plurality of injection ports that are respectively connected to a plurality of cavity partitions.
[0015] In some embodiments, the injection port includes a first injection port disposed on the end wall of the sealing body and a second injection port disposed on the side wall of the sealing body.
[0016] A second aspect of this application provides a bridge expansion joint device, which includes the aforementioned bridge expansion joint seal.
[0017] In the bridge expansion joint seal of this application, the seal body adopts a hollow design with multiple repair agents embedded inside. When the seal body cracks or tears, the cavity separation structure breaks, allowing the multiple repair agents to mix and react in the mixing cavity to form a repair agent. This repair agent can self-repair the cracks in the seal body, thereby effectively extending the life of the seal body, preventing leakage points caused by tearing, and reducing later maintenance costs. Simultaneously, by covering the surface of the seal body with a protective coating, the weather resistance of the seal body can be improved, further extending its service life, reducing the risk of aging and tearing, and lowering later maintenance costs.
[0018] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description
[0019] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings:
[0020] Figure 1 This is a schematic diagram of the cross-section of a bridge expansion joint seal according to a specific embodiment of this application;
[0021] Figure 2 for Figure 1A top view of a bridge expansion joint seal;
[0022] Figure 3 This is a schematic diagram of a bridge expansion joint device according to a specific embodiment of this application.
[0023] Explanation of reference numerals in the attached figures
[0024] Detailed Implementation
[0025] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.
[0026] The present application will now be described in detail with reference to the accompanying drawings and exemplary embodiments.
[0027] First, it's important to clarify that the main problems with existing bridge expansion joint devices lie in material aging and vehicle load impacts, exacerbating the overall failure risk. Firstly, material aging stems from long-term exposure to harsh natural environments, such as ultraviolet radiation, rainwater erosion, freeze-thaw cycles, and salt corrosion (especially in coastal salt spray or northern de-icing salt environments). This leads to rapid hardening and cracking of seals such as rubber (typically within 3-5 years) and severe corrosion of metal embedded parts, significantly reducing sealing performance and structural integrity. Secondly, frequent vehicle traffic accelerates the wear and breakage of seals, further weakening the device's cushioning capacity. Under these conditions, the lifespan of bridge expansion joint devices is drastically shortened, maintenance frequency surges (averaging partial replacement every 3 years), and serious consequences arise, such as water leakage corroding the beam reinforcement and bridge bearings, increasing structural safety risks. These deficiencies highlight the fundamental inadequacies of existing technology in terms of environmental adaptability and mechanical durability. Therefore, innovative solutions are urgently needed to improve the reliability and economy of bridge expansion joint seals and the bridge expansion joint devices using these seals.
[0028] In view of this, such as Figure 1 and Figure 2 As shown, a first exemplary embodiment of this application provides a bridge expansion joint sealant, which includes a sealant body 1, various repair formulations, and a protective coating 2. The sealant body 1 has a mixing cavity 101 and includes a cavity partitioning structure 102, such as a rubber diaphragm, that divides the mixing cavity 101 into multiple cavity partitions. The various repair formulations are stored in their respective cavity partitions, and the protective coating 2 covers the outer surface of the sealant body 1.
[0029] Therefore, in the bridge expansion joint seal of this exemplary embodiment, the seal body 1 adopts a hollow design with multiple repair agents built in. When the seal body 1 cracks or tears due to aging or mechanical wear, the cavity partition structure 102 can crack accordingly, allowing the multiple repair agents to mix and react in the mixing cavity 101 to form a repair agent for repairing the seal body 1. The repair agent can self-repair the cracks in the seal body 1, thereby effectively extending the life of the seal body 1, preventing the seal body 1 from tearing and forming leakage points, and reducing the later maintenance cost of the bridge expansion joint. Crucially, traditional rubber seals require closed repairs when damaged, while the self-repairing seal of this application can be repaired under open traffic conditions, avoiding congestion and safety risks caused by long-term road closures. Furthermore, by covering the surface of the seal body 1 with a protective coating 2, the weather resistance of the seal body 1 can be improved, further extending its service life, reducing the risk of aging and tearing, and lowering later maintenance costs.
[0030] In one embodiment, the sealing body 1 is a rubber molded part with elastic properties. When installed in a bridge expansion joint, it can effectively fill the expansion gap, prevent rainwater and dust from falling into the expansion joint, avoid corrosion of the metal embedded parts of the expansion joint, and effectively buffer vehicle impact.
[0031] Furthermore, the cavity is divided into a first partition 1011 and a second partition 1012. The repair formulation includes an isocyanate formulation stored in the first partition 1011 and an amino formulation stored in the second partition 1012. Specifically, the isocyanate formulation and the amino formulation are mixed to react and generate polyurea. The polyurea repair agent can rapidly solidify from a liquid state to a solid state within 30 seconds. The polyurea repair agent can form an integrated structure with the rubber sealing body 1 through chemical bonding, achieving a more reliable interfacial bond than traditional materials, thereby improving the repair effect on the sealing body 1.
[0032] In one embodiment, the protective coating 2 is a fluorosilicone resin coating. By covering the surface of the sealing body 1 with the fluorosilicone resin coating, micro-cracks caused by exposure to sunlight can be effectively prevented, thus extending its service life. This fluorosilicone resin coating has strong applicability and is suitable for both new and renovation projects.
[0033] In addition, the materials used to prepare the above-mentioned polyurea repair agent and fluorosilicone resin coating all meet environmental protection standards, do not contain harmful substances, and release no toxic gases during the construction process, which can effectively protect the environment and human health.
[0034] In one embodiment, such as Figure 2As shown, the sealing body 1 has multiple mixing cavities 101, which are arranged sequentially at intervals along the width direction of the sealing body 1. Therefore, each mixing cavity 101 can operate independently, allowing for targeted repair of damage to different areas of the sealing body 1, preventing localized failures from affecting the overall function. Furthermore, when a cavity fails due to impact (such as heavy vehicle load), its adjacent cavities can still maintain their repair capabilities, thereby improving the reliability of the bridge expansion joint seal of this application.
[0035] In one embodiment, the cavity partition structure 102 is formed as a tubular partition structure 1021 with an annular cross-section, such as a tubular diaphragm. Two adjacent cavity partitions are located in the radially inner and radially outer regions of the cavity partition structure 102, respectively. Figure 1 The concentric circle structure is shown. In this embodiment, thanks to the symmetry of the annular separation of the tubular partition structure 1021, when the sealing body 1 develops cracks due to load impact or aging, regardless of the direction from which the cracks start and extend, they can effectively extend to the tubular partition structure 1021, causing the tubular partition structure 1021 to be damaged, thereby triggering the mixing of multiple repair formulations, and finally completing the rapid repair of the sealing body 1.
[0036] It should be noted that this application does not limit the number of cavity partitions; the specific number can be determined according to the usage of the repair formulation agent. For example, when using the above-mentioned isocyanate formulation agent and amino formulation agent to mix as a polyurea repair agent, a cavity partition structure 102 can be set to divide the mixing cavity 101 into two cavity partitions, with the two cavity partitions storing the isocyanate formulation agent and the amino formulation agent respectively. Figure 1 For example, the radially outer region of the tubular partition structure 1021 can be used to store isocyanate formulation agents, while the radially inner region can be used to store amino formulation agents. Furthermore, if three cavity partitions are required, two tubular partition structures 1021 with different diameters can be used, such that the two tubular partition structures 1021 divide the mixing cavity 101 into three cavity partitions from the inside out, for storing the three types of repair formulation agents respectively. Similarly, different numbers of cavity partitions can be set to store multiple repair formulation agents, which will not be listed here.
[0037] In one embodiment, the cavity partition structure 102 is formed as a sheet-like partition structure with a linear cross-section, such as a planar diaphragm or a curved diaphragm, and two adjacent cavity partitions are located on opposite sides of the cavity partition structure 102. Specifically, the two side edges of the cavity partition structure 102 are respectively connected to the two side walls of the mixing cavity 101, thereby dividing the mixing cavity 101 into two cavity partitions. In other embodiments, when it is required to provide more than two cavity partitions, multiple cavity partition structures 102 can be arranged sequentially at intervals along the radial direction of the mixing cavity 101 to divide multiple cavity partitions.
[0038] In one embodiment, the sealing body 1 is provided with multiple injection ports that are connected to multiple cavity partitions. The corresponding type of repair agent can be injected into the cavity partitions through the injection ports to facilitate the replacement or replenishment of the repair agent and extend the service life of the bridge expansion joint seal of this application.
[0039] In one embodiment, such as Figure 2 As shown, the injection port includes a first injection port 103 disposed on the end wall of the sealing body 1 and a second injection port 104 disposed on the side wall of the sealing body 1. Figure 2 As shown in the example, when the mixing cavity 101 is divided into inner and outer cavity partitions using a tubular partition structure 1021, the first injection port 103 can communicate with the cavity partition located in the radially inner region, and the second injection port 104 can communicate with the cavity partition located in the radially outer region, thereby facilitating injection into the two cavity partitions. Of course, the end wall of the sealing body 1 can be provided with multiple first injection ports 103, and all cavity partitions can be injected through multiple first injection ports 103. Alternatively, the side wall of the sealing body 1 can be provided with multiple second injection ports 104, and all cavity partitions can be injected through multiple second injection ports 104; this application does not limit this.
[0040] like Figure 3 As shown, a second exemplary embodiment of this application provides a bridge expansion joint device, which includes a support frame 3 disposed on the concrete structure 4 of the bridge and the aforementioned bridge expansion joint sealant, wherein the bridge expansion joint sealant is connected between two support frames 3 to seal the expansion joint. Obviously, the bridge expansion joint device of this exemplary embodiment possesses all the technical effects brought about by the aforementioned bridge expansion joint sealant, and therefore will not be described in detail here.
[0041] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0042] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0043] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0044] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.
Claims
1. A bridge expansion joint seal, characterized in that, include: The sealing body (1) is provided with a mixing cavity (101) and includes a cavity partitioning structure (102) that divides the mixing cavity (101) into multiple cavity partitions. Multiple repair formulations are provided, and each of the repair formulations is stored separately in each of the cavity partitions; and A protective coating (2) is applied to the outer surface of the seal body (1).
2. The bridge expansion joint sealant according to claim 1, characterized in that, The main body (1) of the sealing element is a rubber molded part.
3. The bridge expansion joint sealant according to claim 2, characterized in that, The cavity partition includes a first partition (1011) and a second partition (1012), and the repair formulation includes an isocyanate formulation stored in the first partition (1011) and an amino formulation stored in the second partition (1012).
4. The bridge expansion joint sealant according to claim 2, characterized in that, The protective coating (2) is a fluorosilicone resin coating.
5. The bridge expansion joint sealant according to claim 1, characterized in that, The sealing body (1) is provided with a plurality of mixing cavities (101), which are arranged sequentially at intervals along the width direction of the sealing body (1).
6. The bridge expansion joint seal according to any one of claims 1 to 5, characterized in that, The cavity partition structure (102) is formed as a tubular partition structure (1021) with an annular cross-section, and two adjacent cavity partitions are located in the radial inner region and the radial outer region of the cavity partition structure (102), respectively.
7. The bridge expansion joint seal according to any one of claims 1 to 5, characterized in that, The cavity partition structure (102) is formed as a sheet-like partition structure with a linear cross-section, and two adjacent cavity partitions are located on both sides of the cavity partition structure (102).
8. The bridge expansion joint seal according to any one of claims 1 to 5, characterized in that, The sealing body (1) is provided with a plurality of injection ports that are connected to the plurality of cavity partitions.
9. The bridge expansion joint sealant according to claim 8, characterized in that, The injection port includes a first injection port (103) disposed on the end wall of the sealing body (1) and a second injection port (104) disposed on the side wall of the sealing body (1).
10. A bridge expansion joint device, characterized in that, The bridge expansion joint device includes a bridge expansion joint seal according to any one of claims 1 to 9.