Sealing expansion joint assembly for bridge support and installation method of sealing expansion joint assembly

Abstract

The invention discloses a sealing expansion joint assembly for a bridge support and an installation method of the sealing expansion joint assembly. The sealing expansion joint assembly comprises a sealing expansion joint used for connecting an upper support and a lower support and a fixing assembly used for detachably fixing the sealing expansion joint to the upper support and the lower support. The sealing expansion joint comprises a stretchable or compressible length storage section and support connecting sections which are coaxially and fixedly connected to the two ends of the length storage section and are of an integrated structure with the length storage section. Each support connecting section comprises an inner surface which can be arranged on the upper support or the lower support in a sleeving mode and corresponds to the surface shape of the sleeved part of the upper support or the lower support in a sleeving mode. The sealing expansion joint assembly designed by the invention comprises a stretchable or compressible length storage section which is composed of a plurality of stretching sections and stretching connecting sections, and the structures can flexibly adapt to changes and basically have no internal stress when the bridge support has the conditions of displacement, corner rotation and the like by changing the length size, so that the sealing expansion joint assembly is simple in structure and convenient to use. And it is ensured that the support can normally play a role under different working conditions.

Description

Technical Field

[0001] The invention relates to the technical field of engineering equipment for bridges, and in particular to a sealing expansion joint assembly for a bridge support and an installation method thereof. Background Art

[0002] As the supporting system of bridges, bearings are an important part of bridge structures. At present, various types of bearings of ordinary bridges can basically meet the construction needs of most bridges. In recent years, through the research and adoption of special anti-corrosion coatings, weathering steel materials and other measures, the service life of bearings has also been significantly improved.

[0003] However, when the bearing is used in special environments such as the Gobi Desert, its service life and performance will be significantly reduced due to the climate environment such as perennial sandstorms. For ordinary bearings, wind and sand invasion will bring fine sand and gravel into the bearing. When a small amount of sand and dust gathers in the bearing, it will accelerate the wear of the bearing and eventually cause the bearing to fail; when a large amount of sand and dust gathers in the bearing, it will cause a sharp increase in bearing wear, resulting in the loss of bearing function.

[0004] In the article "Experimental Study on Anti-wind and Sand of New Spherical Steel Bearings for Railway Bridges" published by Song Xiaodong and others from Southwest Jiaotong University, a railway anti-wind and sand spherical steel bearing was disclosed, and the anti-wind and sand performance was experimentally studied. The public article shows that the bearing is designed with a fully sealed elastic enclosure around the bearing in view of the characteristics of sandstorms, and the stainless steel plate on the side of the bearing sliding plate and the stainless steel plate on the bottom are designed to be integrated. Through testing the bearing, the main conclusion is that the life of the new bearing can reach 30 years, while the life of ordinary bearings is only 3 years. However, the article does not explain how to achieve the design displacement of the bearing. From a structural analysis, the realization of the bearing displacement can only rely on the elastic deformation of the elastic enclosure, and the structure of the elastic enclosure has no special design to adapt to deformation. In addition, there is no special sealing design for the connection between the elastic enclosure and the upper and lower bearing plates. Therefore, there are problems with the displacement and sealing performance of the bearing.

[0005] Chinese patent CN221798137U "A kind of wind and sand proof spherical bearing" discloses a wind and sand proof spherical bearing. The bearing mainly optimizes the dustproof enclosure structure to ensure the sealing performance under the conditions of cornering and displacement. Secondly, an "internal dustproof sealing structure" is added between the retaining ring of the fixed bearing and the lower bearing to increase the secondary protection of the dustproof of the fixed bearing. However, through the analysis of the disclosed structure, its closed design method can indeed play a role in preventing wind and sand, but because the adjustment plate and the bottom support of the dustproof enclosure are in free contact, its sealing is difficult to guarantee, especially for movable bearings. Due to stiffness, displacement and other reasons, it is a great test for sealing. Furthermore, the internal dustproof sealing structure is only suitable for installation on fixed spherical bearings. According to the public information, movable spherical bearings cannot be installed with this structure, and the purpose of secondary protection cannot be achieved.

[0006] Therefore, designing a sealed expansion joint that mainly solves the climate problem of sandstorms while ensuring the basic functions of the bearing, such as horizontal displacement and rotation angle, and installing it on the bearing to meet the functional and durability requirements of bridges in desert areas is a key issue that needs to be studied and solved urgently. Summary of the invention

[0007] The purpose of the present invention is to solve the shortcomings of the above-mentioned background technology and provide a sealing expansion joint assembly and its installation method that meets the functional requirements of the support such as displacement and rotation angle and sufficient durability requirements, and ensures that the support can remain in a fully closed state under various working conditions.

[0008] To achieve this purpose, the present invention is designed to provide a sealed expansion joint assembly for a bridge bearing, which includes a sealed expansion joint for connecting an upper bearing and a lower bearing and a fixing assembly for detachably fixing the sealed expansion joint to the upper bearing and the lower bearing; the sealed expansion joint includes a stretchable or compressible length reserve section and a bearing connecting section that is coaxially fixedly connected to both ends of the length reserve section and is an integral structure with the length reserve section; the bearing connecting section includes an inner surface that can be sleeved on the upper bearing or the lower bearing and corresponds to the surface shape of the sleeved portion of the upper bearing or the lower bearing.

[0009] Furthermore, the length reserve segment includes a plurality of stretching segments arranged at intervals along its axial direction and whose length dimensions can be changed by stretching or compression. A stretching connection segment is coaxially fixedly connected between two adjacent stretching segments, and the stretching connection segment can also change its length dimension by stretching or compression.

[0010] Furthermore, the stretching segment comprises a hollow cylindrical structure with an outer circumferential surface protruding outward; and the stretching connection segment comprises a hollow cylindrical structure with an outer circumferential surface concave inward.

[0011] Furthermore, the support connecting section includes a hollow cylindrical structure which is coaxially fixedly connected to the end of the length reserve section and is an integral structure with the length reserve section, and the hollow cylindrical structure includes an inner surface corresponding to the surface shape of the part on which the upper support or the lower support is mounted.

[0012] Furthermore, the inner surface includes a groove-shaped inner surface, a terrace-shaped inner surface and an arc-shaped inner surface.

[0013] Preferably, the sealing expansion joint can be made of polytetrafluoroethylene material, the tensile strength of the polytetrafluoroethylene is ≥30MPa, the tensile strain at break is ≥300%, and the tensile elastic modulus is 480MPa~720MPa. The sealing expansion joint made of polytetrafluoroethylene material is suitable for use in environments with temperature changes and organic corrosive substances.

[0014] Preferably, the sealing expansion joint can be made of chloroprene rubber material, the tensile strength of the chloroprene rubber material is ≥17MPa, the tensile strain at break is ≥400%, and the tensile elastic modulus is 2.8MPa to 3.5MPa. The sealing expansion joint made of chloroprene rubber material is suitable for environments with fire risks and ozone.

[0015] Preferably, the sealing expansion joint can also be made of stainless steel material, the tensile strength of the stainless steel material is ≥400MPa, the tensile strain at break is ≥30%, and the tensile elastic modulus is 190GPa~210GPa. The sealing expansion joint made of stainless steel material is suitable for use in an environment where sandstorms exist.

[0016] Furthermore, the fixing assembly includes a clamp, and the clamp is made of stainless steel with a grade of 17Cr16Ni12.

[0017] Furthermore, a method for installing a sealed expansion joint assembly for a bridge bearing is provided: the bearing connecting sections at both ends of the sealed expansion joint are respectively mounted on the upper bearing and the lower bearing, and the bearing connecting sections are detachably fixed to the upper bearing and the lower bearing by a fixing assembly, the sealed expansion joint and the upper bearing and the lower bearing form a closed space, and the sealed expansion joint can change its length by stretching or compressing to adapt to the relative movement and rotation of the upper bearing and the lower bearing.

[0018] The beneficial effects of the present invention are as follows: the sealing expansion joint assembly designed by the present invention includes a length reserve section that can be stretched or compressed, which is composed of multiple stretching segments and stretching connecting segments. These structures can change the length dimension by stretching or compressing, so that when the support is displaced, turned, etc., it can flexibly adapt to the changes, and basically no internal stress is generated, which greatly reduces the possibility of fatigue damage, meets the functional requirements during normal operation, and ensures that the support can function normally under different working conditions. Through the cooperation of the sealing expansion joint and the fixing assembly, the support connection section of the sealing expansion joint can be sleeved on the upper support and the lower support, and can be detachably fixed by the fixing assembly, which can effectively ensure that the sealing expansion joint is tightly connected to the support, thereby ensuring that the support can maintain a fully closed state under various working conditions, avoiding the influence of adverse external factors on the internal structure of the support, and also helping to extend the service life of the support and meet sufficient durability requirements. If the sealing expansion joint is made of polytetrafluoroethylene, its tensile strength is ≥30MPa, the tensile strain at break is ≥300%, and the tensile elastic modulus is 480MPa~720MPa. This material property makes it suitable for use in environments with temperature differences and organic corrosive substances. It can resist the effects of thermal expansion and contraction caused by temperature differences and the erosion of organic corrosive substances, ensuring the stable performance and long-term reliable use of the sealing expansion joint. When the sealing expansion joint is made of chloroprene rubber, its tensile strength is ≥17MPa, the tensile strain at break is ≥400%, and the tensile elastic modulus is 2.8MPa~3.5MPa. With such performance, it is suitable for environments with fire risks and ozone, and can normally perform functions such as sealing and adapting to deformation in such special and dangerous environments, providing effective protection for the support. The sealing expansion joint is made of stainless steel, with a tensile strength of ≥400MPa, a tensile strain at break of ≥30%, and a tensile elastic modulus of 190GPa to 210GPa, which makes the sealing expansion joint well suited for use in environments with sandstorms, can resist the impact and wear of dust and other particles, maintain its own structural integrity, and ensure that the sealing performance of the support is not affected by the harsh environment of sandstorms. The clamp in the fixed component is made of stainless steel with a grade of 17Cr16Ni12. This stainless steel material has good strength, corrosion resistance and other properties, and can stably fix the sealing expansion joint to the upper and lower supports in a detachable manner, ensuring the firmness of the connection between the sealing expansion joint and the support. At the same time, it can also adapt to different use conditions, reducing the occurrence of problems such as sealing failure caused by damage to the fixed component. The installation method of the sealed expansion joint assembly is simple and clear, that is, the support connecting sections at both ends of the sealed expansion joint are respectively mounted on the upper support and the lower support, and then detachably fixed by the fixing assembly. The operation is relatively convenient, which is convenient for construction personnel to carry out installation operations in actual projects, and can effectively improve the installation efficiency. The detachable fixing method is also convenient for subsequent maintenance and replacement of the sealed expansion joint assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional diagram of a circular sealing expansion joint with a grooved inner surface in the present invention;

[0020] Figure 2 It is a front view of a circular sealing expansion joint with a grooved inner surface in the present invention;

[0021] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0022] Figure 4 It is a three-dimensional diagram of a circular fixing component in the present invention;

[0023] Figure 5 It is a three-dimensional diagram of a square ring-shaped sealing expansion joint with a grooved inner surface in the present invention;

[0024] Figure 6 It is a front view of a square ring-shaped sealing expansion joint with a grooved inner surface in the present invention;

[0025] Figure 7 for Figure 6 Enlarged view of point B in the middle;

[0026] Figure 8 A three-dimensional diagram of a square annular fixing assembly in the present invention;

[0027] Fig. 9 It is an axial cross-sectional view of the sealing expansion joint with a grooved inner surface installed on the upper and lower supports in the present invention;

[0028] Fig.10 It is a front view of a circular sealing expansion joint with a stepped inner surface in the present invention;

[0029] Fig.11 for Fig.10 Enlarged view of point C in the middle;

[0030] Fig.12 It is a front view of a square ring-shaped sealing expansion joint with a terraced inner surface in the present invention;

[0031] Fig.13 for Fig.12 Enlarged view of point D in the middle;

[0032] Fig.14 It is a front view of a circular sealing expansion joint having an arc-shaped inner surface in the present invention;

[0033] Fig.15 for Fig.14 Enlarged view of point E in the middle;

[0034] Fig.16It is a front view of a square ring-shaped sealing expansion joint with an arc-shaped inner surface in the present invention;

[0035] Fig.17 for Fig.15 Enlarged view of point F in the middle;

[0036] Among them, 100 is a sealing expansion joint assembly, 101 is a sealing expansion joint (101.1 is a length reserve section, 101.2 is a support connection section), 102 is a fixing assembly (102.1 is a clamp, 102.2 is a fixing seat, 102.3 is a bolt, 102.4 is a nut), 103 is a stretching section, 104 is a stretching connection section, 105 is an upper support connection section, 106 is an annular matching inner surface of the upper support, 107 is a lower support connection section, 108 is an annular matching inner surface of the lower support;

[0037] 201—upper support, 202—lower support. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0039] like Figure 1As shown in FIG. 4 , in certain embodiments, a sealing expansion joint assembly for a fixed bridge bearing includes a sealing expansion joint 101 for connecting an upper bearing 201 and a lower bearing 202 and a fixing assembly 102 for detachably fixing the sealing expansion joint 101 to the upper bearing 201 and the lower bearing 202; the sealing expansion joint 101 includes a stretchable or compressible length reserve section 101.1 and a bearing connection section 101.2 which is coaxially fixedly connected to both ends of the length reserve section 101.1 and is an integral structure with the length reserve section 101.1; the bearing connection section 101.2 includes an inner surface which can be sleeved on the upper bearing 201 or the lower bearing 202 and corresponds to the surface shape of the sleeved portion of the upper bearing 201 or the lower bearing 202. The length reserve section 101.1 includes a plurality of stretching segments 103 arranged at intervals along the axial direction thereof, and the length dimension of which can be changed by stretching or compression. A stretching connection segment 104 is coaxially fixedly connected between two adjacent stretching segments 103, and the length dimension of the stretching connection segment 104 can also be changed by stretching or compression. The stretching segment 103 is a hollow cylindrical structure with an outwardly protruding circumferential outer surface. The stretching connection segment 104 is a hollow cylindrical structure with an inwardly recessed circumferential outer surface. The support connection section 101.2 is a hollow cylindrical structure that is coaxially fixedly connected to the end of the length reserve section 101.1 and is an integral structure with the length reserve section 101.1, and includes an upper support connection section 105 and a lower support connection section 107. The inner surface of the upper support connection section 105 is an upper support annular matching inner surface 106 corresponding to the surface shape of the sleeved portion of the upper support 201, and the inner surface of the lower support connection section 107 is a lower support annular matching inner surface 108 corresponding to the surface shape of the sleeved portion of the lower support 202. The fixing assembly 102 includes a clamp 102.1, and a fixing seat 102.2 is fixedly connected to both ends of the clamp 102.1. The two fixing seats 102.2 are detachably fixed by bolts 102.3 and nuts 102.4. The clamp 102.1 is made of stainless steel with a grade of 17Cr16Ni12. The sealing expansion joint 101 is a circular ring structure, and the clamp 102.1 is also a circular ring structure.

[0040] Embodiment 1

[0041] The installation method of the sealed expansion joint assembly for fixed bridge bearings is as follows: the bearing connection sections 101.2 at both ends of the sealed expansion joint 101 are respectively sleeved on the upper bearing 201 and the lower bearing 202, and the bearing connection section 101.2 is detachably fixed to the upper bearing 201 and the lower bearing 202 by the fixing assembly 102. Taking the spherical steel bearing as an example, the axial cross-sectional view of the sealed expansion joint assembly installed on the upper and lower bearings of the spherical steel bearing according to the above installation method is as follows Fig. 9As shown. The upper support 201, the lower support 202 and the sealing expansion joint assembly 100 enclose a closed space, in which a plane friction pair and a curved friction pair are arranged. The upper support 201 and the lower support 202 achieve relative movement between the two through the plane friction pair, and achieve relative rotation between the two through the curved friction pair; the sealing expansion joint 101 can change its length by stretching or compressing to adapt to the relative movement and rotation between the upper support 201 and the lower support 202. The plane friction pair and the curved friction pair are common structures of existing spherical steel supports, and the present invention will not repeat them.

[0042] like Figure 5 As shown in FIG. 8 , in certain other embodiments, a sealing expansion joint assembly for a movable bridge bearing comprises a sealing expansion joint 101 for connecting an upper bearing 201 and a lower bearing 202 and a fixing assembly 102 for detachably fixing the sealing expansion joint 101 to the upper bearing 201 and the lower bearing 202; the sealing expansion joint 101 comprises a stretchable or compressible length reserve section 101.1 and a bearing connection section 101.2 which is coaxially fixedly connected to both ends of the length reserve section 101.1 and is an integral structure with the length reserve section 101.1; the bearing connection section 101.2 comprises an inner surface which can be sleeved on the upper bearing 201 or the lower bearing 202 and corresponds to the surface shape of the sleeved portion of the upper bearing 201 or the lower bearing 202. The length reserve section 101.1 includes a plurality of stretching segments 103 arranged at intervals along the axial direction thereof, and the length dimension of which can be changed by stretching or compression. A stretching connection segment 104 is coaxially fixedly connected between two adjacent stretching segments 103, and the axial dimension of the stretching connection segment 104 can also be changed by stretching or compression. The stretching segment 103 is a hollow cylindrical structure with an outwardly protruding circumferential outer surface. The stretching connection segment 104 is a hollow cylindrical structure with an inwardly recessed circumferential outer surface. The support connection section 101.2 is a hollow cylindrical structure that is coaxially fixedly connected to the end of the length reserve section 101.1 and is an integral structure with the length reserve section 101.1, and includes an upper support connection section 105 and a lower support connection section 107. The inner surface of the upper support connection section 105 is an upper support annular matching inner surface 106 corresponding to the surface shape of the sleeved portion of the upper support 201, and the inner surface of the lower support connection section 107 is a lower support annular matching inner surface 108 corresponding to the surface shape of the sleeved portion of the lower support 202. The fixing assembly 102 includes a clamp 102.1, and a fixing seat 102.2 is fixedly connected to both ends of the clamp 102.1. The two fixing seats 102.2 are detachably fixed by bolts 102.3 and nuts 102.4. The clamp 102.1 is made of stainless steel with a grade of 17Cr16Ni12. The sealing expansion joint 101 is a round-square ring structure, and the clamp 102.1 is also a square ring structure.

[0043] Embodiment 2

[0044] The installation method of the sealing expansion joint assembly for the movable bridge bearing is as follows: the bearing connection sections 101.2 at both ends of the sealing expansion joint 101 are respectively sleeved on the upper bearing 201 and the lower bearing 202, and the bearing connection section 101.2 is detachably fixed to the upper bearing 201 and the lower bearing 202 by the fixing assembly 102. The axial cross-sectional view of the sealing expansion joint assembly installed on the upper and lower bearings of the spherical steel bearing according to the above installation method is shown in the figure below. Fig. 9 As shown. The upper support 201, the lower support 202 and the sealing expansion joint assembly 100 enclose a closed space, in which a plane friction pair and a curved friction pair are arranged. The upper support 201 and the lower support 202 realize relative movement between the two through the plane friction pair, and realize relative rotation between the two through the curved friction pair; the sealing expansion joint 101 can change its length by stretching or compressing to adapt to the relative movement and rotation between the upper support 201 and the lower support 202.

[0045] In the above technical solution, the upper support annular matching inner surface 106 and the lower support connecting section 107 can be Figure 3 and Figure 7 The grooved inner surface shown can also be Fig.10 — Fig.13 The terraced inner surface shown can also be Fig.14 — Fig.17 The arc-shaped inner surface shown can be specifically designed in a targeted manner according to the groove structure of the sleeved parts of the upper support 201 and the lower support 202 to form an expansion joint solution dedicated to bridge support.

[0046] The sealing expansion joint 101 in the present invention is a key component, which is composed of a stretched or compressed length reserve section 101.1 and a support connection section 101.2 coaxial with it and fixedly connected at both ends, and the two are an integrated structure. This integrated design ensures the integrity of the structure, so that it can work together when it performs its function and better adapt to the needs of bridge bearings under different working conditions. The length reserve section 101.1 includes a plurality of stretching segments 103 arranged at intervals along the axial direction, and adjacent stretching segments 103 are coaxially fixedly connected by stretching connection segments 104. In addition, both the stretching segment 103 and the stretching connection segment 104 can change the length size by stretching or compression. The stretching segment 103 presents a hollow cylindrical structure with a circumferential outer surface protruding outward, while the stretching connection segment 104 is a hollow cylindrical structure with a circumferential outer surface concave inward. Such a structural design enables the length reserve section 101.1 to be flexibly stretched or compressed when facing changes in the displacement, angle, etc. of the bridge bearing, effectively buffering and adapting to these changes, and ensuring the normal operation of the bearing as a whole. The support connection section 101.2 is divided into an upper support connection section 105 and a lower support connection section 107, both of which are hollow cylindrical structures that are coaxially fixedly connected to the end of the length reserve section 101.1 and are an integral structure. The upper support annular matching inner surface 106 of the upper support connection section 105 corresponds to the surface shape of the sleeved part of the upper support 201, and the lower support annular matching inner surface 108 of the lower support connection section 107 corresponds to the surface shape of the sleeved part of the lower support 202. This precise corresponding design ensures that the sealing expansion joint 101 can be tightly and firmly sleeved on the upper support 201 and the lower support 202, thereby enhancing the sealing and reliability of the connection. The clamp 102.1 in the fixed component 102 is made of stainless steel with a grade of 17Cr16Ni12, which has good strength and corrosion resistance. The two ends of the clamp 102.1 are fixedly connected with a fixing seat 102.2, and the two fixing seats 102.2 are detachably fixed by bolts 102.3 and nuts 102.4. This detachable connection method facilitates the operation of the sealing expansion joint assembly in the installation, maintenance and replacement stages. At the same time, the sealing expansion joint 101 can be firmly fixed to the upper support 201 and the lower support 202 by the tightening effect of the clamp, thereby ensuring the stability of the entire structure. The support connection sections 101.2 at both ends of the sealing expansion joint 101 are respectively sleeved on the upper support 201 and the lower support 202, and then detachably fixed by the fixing assembly 102. This installation method is relatively simple and direct to operate, and is easy for construction personnel to master and implement. In actual engineering applications, the detachable fixation feature provides convenience for subsequent maintenance work such as overhaul and component replacement, which can effectively reduce operation and maintenance costs and improve the use efficiency and life of the entire bridge support system.Plane friction pairs, curved friction pairs and other structures can be arranged in the closed space surrounded by the upper support 201, the lower support 202 and the sealed expansion joint assembly 100. On the basis of the sealed expansion joint assembly ensuring sealing and adapting to deformation, the closed space can effectively block the influence of external environmental factors on the friction pair, and reduce the wear and corrosion of the friction pair caused by the entry of impurities such as dust and moisture, thereby ensuring that the bridge bearing can stably and reliably perform its load-bearing, displacement adaptation and other functions under various working conditions, meet durability requirements, and provide stable support and good displacement adaptability for related engineering structures such as bridges. In summary, the sealed expansion joint assembly for bridge bearings designed by the present invention and the installation method thereof have reasonable and effective characteristics in terms of structural design, installation convenience and overall function realization, which helps to improve the performance and reliability of bridge bearings in actual engineering.

[0047] In addition, the sealing expansion joint 101 can be made of polytetrafluoroethylene material, the tensile strength of polytetrafluoroethylene is ≥30MPa, the tensile strain at break is ≥300%, and the tensile elastic modulus is 480MPa~720MPa. The sealing expansion joint 101 made of polytetrafluoroethylene material is suitable for use in environments with temperature differences and organic corrosive substances. The sealing expansion joint 101 can also be made of chloroprene rubber material, the tensile strength of chloroprene rubber material is ≥17MPa, the tensile strain at break is ≥400%, and the tensile elastic modulus is 2.8MPa~3.5MPa. The sealing expansion joint 101 made of chloroprene rubber material is suitable for environments with fire risks and ozone. The sealing expansion joint 101 can also be made of stainless steel material, the tensile strength of stainless steel material is ≥400MPa, the tensile strain at break is ≥30%, and the tensile elastic modulus is 190GPa~210GPa. The sealing expansion joint 101 made of stainless steel material is suitable for use in environments with sandstorms. The material for making the sealing expansion joint 101 can be artificially selected according to the environment in which it is located.

[0048] It should be noted that the tensile or compressive deformation of the sealing expansion joint 101 designed by the present invention is achieved through its own length reserve structure, not through the tensile or compressive deformation of the material itself. The material and shape of the sealing expansion joint assembly 100 are reasonably selected, and the upper support annular matching inner surface 106 and the lower support annular matching inner surface 108 are reasonably designed according to the surface shape of the upper and lower support parts to make the upper support annular matching inner surface 106 and the lower support annular matching inner surface 108 respectively fit the surface of the upper support part and the surface of the lower support part to form a sealing expansion joint assembly 100 dedicated to the bridge support. In order to facilitate the disassembly and assembly of the sealing expansion joint assembly 100, the sealing expansion joint 101 can be designed as an open-loop structure, the overlapping width of the open-loop expansion joint should not be less than 50 mm, and a reliable bonding and suturing technology is used to make it a closed structure.

[0049] Here, it should be noted that the description of the above technical solutions is exemplary, and this specification can be embodied in different forms and should not be interpreted as being limited to the technical solutions set forth herein. On the contrary, providing these descriptions will make the disclosure of the present invention thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solution of the present invention is limited only by the scope of the claims. In the case of using "including", "having" and "comprising" described in this specification, there may also be another part or other parts, and the terms used may generally be singular but may also represent plural forms. Finally, it should be pointed out that the above embodiments are only more representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments, and there may be many variations. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention shall be deemed to belong to the protection scope of the present invention.

Claims

1. A sealed expansion joint assembly for a bridge support, characterized in that: It comprises a sealing expansion joint (101) for connecting an upper support (201) and a lower support (202) and a fixing assembly (102) for detachably fixing the sealing expansion joint (101) to the upper support (201) and the lower support (202); the sealing expansion joint (101) comprises a stretchable or compressible length reserve section (101.1) and a support connection section (101.2) coaxially fixedly connected to both ends of the length reserve section (101.1) and forming an integral structure with the length reserve section (101.1); the support connection section (101.2) comprises an inner surface that can be sleeved on the upper support (201) or the lower support (202) and corresponds to the surface shape of the sleeved portion of the upper support (201) or the lower support (202).

2. The sealed expansion joint assembly for a bridge support according to claim 1, characterized in that: The length reserve section (101.1) comprises a plurality of stretching segments (103) which are arranged at intervals along the axial direction thereof and whose length dimensions can be changed by stretching or compression. A stretching connection segment (104) is coaxially fixedly connected between two adjacent stretching segments (103), and the stretching connection segment (104) can also change its length dimension by stretching or compression.

3. The sealed expansion joint assembly for a bridge support as claimed in claim 2, characterized in that: The stretching segment (103) comprises a hollow cylindrical structure with an outer circumferential surface protruding outward; and the stretching connection segment (104) comprises a hollow cylindrical structure with an outer circumferential surface concave inward.

4. The sealed expansion joint assembly for a bridge support according to claim 1, characterized in that: The support connecting section (101.2) comprises a hollow cylindrical structure which is coaxially fixedly connected to the end of the length reserve section (101.1) and is an integral structure with the length reserve section (101.1); the hollow cylindrical structure comprises an inner surface corresponding to the surface shape of the sleeved portion of the upper support (201) or the lower support (202).

5. The sealed expansion joint assembly for a bridge support as claimed in claim 4, characterized in that: The inner surface includes a groove-shaped inner surface, a terrace-shaped inner surface and an arc-shaped inner surface.

6. The sealed expansion joint assembly for a bridge support according to claim 1, characterized in that: The sealing expansion joint (101) is made of polytetrafluoroethylene material, the tensile strength of the polytetrafluoroethylene is ≥30MPa, the tensile strain at break is ≥300%, and the tensile elastic modulus is 480MPa-720MPa. The sealing expansion joint (101) made of polytetrafluoroethylene material is suitable for use in an environment with temperature differences and organic corrosive substances.

7. The sealed expansion joint assembly for a bridge support according to claim 1, characterized in that: The sealing expansion joint (101) is made of chloroprene rubber material, the tensile strength of the chloroprene rubber material is ≥17MPa, the tensile strain at break is ≥400%, and the tensile elastic modulus is 2.8MPa-3.5MPa. The sealing expansion joint (101) made of chloroprene rubber material is suitable for environments with fire risks and ozone.

8. The sealed expansion joint assembly for a bridge support according to claim 1, characterized in that: The sealing expansion joint (101) is made of stainless steel material, the tensile strength of the stainless steel material is ≥400 MPa, the tensile strain at break is ≥30%, and the tensile elastic modulus is 190 GPa to 210 GPa. The sealing expansion joint (101) made of stainless steel material is suitable for use in an environment with sandstorms.

9. The sealed expansion joint assembly for a bridge support according to claim 1, characterized in that: The fixing assembly (102) comprises a clamp (102.1), and the clamp (102.1) is made of stainless steel with a grade of 17Cr16Ni12.

10. A method for installing a sealed expansion joint assembly for a bridge support according to any one of claims 1 to 9, characterized in that: The support connecting sections (101.2) at both ends of the sealing expansion joint (101) are respectively sleeved on the upper support (201) and the lower support (202), and the support connecting section (101.2) is detachably fixed to the upper support (201) and the lower support (202) by a fixing assembly (102). The sealing expansion joint (101) and the upper support (201) and the lower support (202) enclose a closed space. The sealing expansion joint (101) can change its length by stretching or compressing to adapt to the relative movement and rotation of the upper support (201) and the lower support (202).

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