Sealed expansion joint structure installed in structure

Abstract

A closed-type expansion joint structure installed in a facility is disclosed. An expansion joint structure according to one embodiment of the present disclosure may include: a first facility paving layer formed in at least one area of ​​the upper surface of a slab; a second facility paving layer formed opposite to the first facility paving layer in at least one area of ​​the upper surface of another slab disposed at a predetermined distance from the slab, and disposed further apart than the distance between the slab and the other slab; an elastic member disposed between the slab and the other slab; and a sealing member disposed between the first facility paving layer and the second facility paving layer and provided to seal the space between the first facility paving layer and the second facility paving layer.

Description

Technology Field

[0001] The present disclosure relates to a closed-type expansion joint structure installed in a facility, and more specifically, to a structure that accommodates the expansion of a facility by sealing the gap between a slab and a pavement layer of the facility through an elastic member and a sealing member. Background Technology

[0002] Expansion joint structures of facilities (e.g., bridges, underpasses, etc.) are essential structures for absorbing displacement caused by thermal expansion, contraction, and vibration of the facility deck, and for ensuring the safe and smooth passage of means of transportation (e.g., vehicles).

[0003] These structures serve to fill the gaps between facility slabs and effectively absorb movements caused by temperature changes, vehicle loads, and structural deformation of the facilities, thereby maintaining the stability and durability of the facilities.

[0004] However, existing expansion joint structures had a problem in that the lifespan of the elastic members could be shortened due to contact with dust, moisture, de-icing agents, etc.

[0005] If the elastic member wears out due to the aforementioned problem, it can increase maintenance costs for the facility and have a negative impact on safety.

[0006] Therefore, technology is required to prevent the problem of reduced service life of expansion joint structures due to wear of elastic members, etc. Prior art literature

[0007] Registered Patent Publication No. 10-2195172 The problem to be solved

[0008] The present disclosure aims to solve all the problems of the aforementioned prior art.

[0009] Additionally, the present disclosure has another objective of providing an expansion joint structure comprising: a first facility paving layer formed in at least one area of ​​the upper surface of a slab; a second facility paving layer formed opposite to the first facility paving layer in at least one area of ​​the upper surface of another slab spaced apart from the slab by a predetermined distance, and spaced further apart than the distance between the slab and the other slab; an elastic member disposed between the slab and the other slab; and a sealing member disposed between the first facility paving layer and the second facility paving layer and arranged to seal the space between the first facility paving layer and the second facility paving layer.

[0010] In addition, the present disclosure has another objective of increasing the lifespan of elastic members by applying a sealing member made of fiber-reinforced plastic (FRP) to an expansion joint structure.

[0011] In addition, the present disclosure has another objective of facilitating moisture drainage by forming a curve with respect to the width direction of the facility through a virtual line defined by connecting the lower ends of the elastic members.

[0012] The purposes of the present disclosure are not limited to those mentioned above, and other purposes and advantages of the present disclosure not mentioned may be understood from the following description and will be more clearly understood from the embodiments of the present disclosure. Furthermore, it will be readily apparent that the purposes and advantages of the present disclosure can be realized by the means and combinations thereof set forth in the claims. means of solving the problem

[0013] An expansion joint structure according to one embodiment of the present disclosure may include a first facility paving layer formed in at least one area of ​​the upper surface of a slab, a second facility paving layer formed opposite to the first facility paving layer in at least one area of ​​the upper surface of another slab spaced apart from the slab at a predetermined distance and spaced further apart than the distance between the slab and the other slab, an elastic member disposed between the slab and the other slab, and a sealing member disposed between the first facility paving layer and the second facility paving layer and provided to seal the space between the first facility paving layer and the second facility paving layer.

[0014] In addition, the sealing member may include a composition comprising fiber reinforced plastic (FRP).

[0015] Additionally, the sealing member may include a primer layer in which a primer is applied to at least one area among the upper surface of the slab, the upper surface of the other slab, the upper surface of the elastic member, a virtual surface connecting the upper surface of the slab and the upper surface of the other slab, and a first FRP member formed by filling at least one area of ​​the space defined as the area where the primer layer is formed with a composition including fiber reinforced plastic (FRP).

[0016] Additionally, the first FRP member may have a central area of ​​its upper surface formed flat, and the sealing member may include a cover member provided to cover the upper surface of the first FRP member corresponding to the spaced-out space between the slab and the other slab.

[0017] Additionally, the sealing member may include a second FRP member formed by filling a composition comprising fiber reinforced plastic (FRP) in at least one area of ​​a space defined as a region where a primer layer is formed, a cover member, and a virtual surface connecting the upper surface of the first facility packaging layer and the upper surface of the second facility packaging layer.

[0018] Additionally, the elastic member may have a first diameter from the top to the bottom based on a first cross-section in the central region with respect to the width direction of the facility. And, based on a second cross-section in the edge region with respect to the width direction of the facility, the diameter from the top to the bottom may be a second diameter that is longer than the first diameter.

[0019] In addition, the above elastic member can form an arch curve with respect to the width direction of the facility, and a straight line with respect to the width direction of the facility, with respect to the width direction of the facility, with respect to the width direction of the facility, with respect to the width direction of the facility, with respect to the imaginary line defined by connecting the upper part.

[0020] Additionally, the first cross section may be circular or elliptical, and the second cross section may include a virtual first straight line running parallel to the face direction of the slab and intersecting the side of the slab and the other slab, a virtual second straight line parallel to the first straight line and spaced apart by a predetermined distance, a rectangular element defined by the side of the slab and the side of the other slab, an upper curve element connected at the top of the rectangular element, convex upward, and forming the same curve as the top of the first cross section in at least one area, and a lower curve element connected at the bottom of the rectangular element, convex downward, and forming the same curve as the bottom of the first cross section in at least one area.

[0021] In addition, the expansion joint structure may include a coating layer formed by coating a composition comprising fiber reinforced plastic (FRP) on at least one area of ​​the lower surface of the elastic member. Effects of the invention

[0022] According to the present disclosure, an expansion joint structure can be provided comprising: a first facility paving layer formed in at least one area of ​​the upper surface of a slab; a second facility paving layer formed opposite to the first facility paving layer in at least one area of ​​the upper surface of another slab disposed at a predetermined distance from the slab and disposed further apart than the distance between the slab and the other slab; an elastic member disposed between the slab and the other slab; and a sealing member disposed between the first facility paving layer and the second facility paving layer and arranged to seal the space between the first facility paving layer and the second facility paving layer.

[0023] In addition, according to the present disclosure, by applying a sealing member made of fiber-reinforced plastic (FRP) to an expansion joint structure, the lifespan of the elastic member can be increased.

[0024] In addition, according to the present disclosure, a virtual line defined by connecting the lower portions of the elastic members with respect to the width direction of the facility forms a curve, thereby facilitating the discharge of moisture. Brief explanation of the drawing

[0025] FIG. 1 is a drawing illustrating, by way of example, a facility and an expansion joint structure of the facility according to one embodiment of the present disclosure. FIG. 2 is a drawing exemplarily illustrating a facility and an expansion joint structure of the facility according to one embodiment of the present disclosure. FIG. 3 is a drawing exemplarily illustrating a cross-sectional view in the BB' direction of an expansion joint structure of a facility according to one embodiment of the present disclosure. FIG. 4 is a drawing exemplarily illustrating a cross-sectional view in the BB' direction of an expansion joint structure of a facility according to one embodiment of the present disclosure. FIG. 5 is a drawing exemplarily illustrating a cross-sectional view in the BB' direction of an expansion joint structure of a facility according to one embodiment of the present disclosure. FIG. 6 is a drawing exemplarily illustrating a cross-sectional view of an expansion joint structure of a facility according to one embodiment of the present disclosure. FIG. 7 is a drawing exemplarily illustrating a cross-sectional view of an elastic member according to one embodiment of the present disclosure. FIG. 8 is a drawing that exemplarily illustrates a cross-sectional view in the CC' direction of an expansion joint structure of a facility according to one embodiment of the present disclosure. Specific details for implementing the invention

[0026] The embodiments described herein are subject to various modifications and may have various forms; specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the scope of specific embodiments and should be understood to include various modifications, equivalents, and / or alternatives of the embodiments of the present disclosure. In relation to the description of the drawings, similar reference numerals may be used for similar components.

[0027] In describing the present disclosure, if it is determined that a detailed description of related known functions or configurations could unnecessarily obscure the essence of the present disclosure, such detailed description is omitted.

[0028] Additionally, the following embodiments may be modified in various other forms, and the scope of the technical concept of the present disclosure is not limited to the following embodiments. Rather, these embodiments are provided to make the present disclosure more faithful and complete and to fully convey the technical concept of the present disclosure to those skilled in the art.

[0029] The terms used in this disclosure are used merely to describe specific embodiments and are not intended to limit the scope of the rights. The singular expression includes the plural expression unless the context clearly indicates otherwise.

[0030] In the present disclosure, expressions such as “have,” “may have,” “include,” or “may include” indicate the presence of such features (e.g., numerical values, functions, actions, or components such as parts) and do not exclude the presence of additional features.

[0031] In the present disclosure, expressions such as “A or B,” “at least one of A or / and B,” or “one or more of A or / and B” may include all possible combinations of items listed together. For example, “A or B,” “at least one of A and B,” or “at least one of A or B” may refer to cases including (1) at least one A, (2) at least one B, or (3) both at least one A and at least one B.

[0032] Expressions such as "first," "second," "first," or "second" used in this disclosure may modify various components regardless of order and / or importance, and are used only to distinguish one component from another and do not limit said components.

[0033] Where it is stated that a component (e.g., Component 1) is "(operatively or communicatively) coupled with / to" or "connected to" another component (e.g., Component 2), it should be understood that the component may be directly connected to the other component or connected through the other component (e.g., Component 3).

[0034] On the other hand, when it is stated that a certain component (e.g., a first component) is "directly connected" or "directly coupled" to another component (e.g., a second component), it may be understood that no other component (e.g., a third component) exists between the certain component and the other component.

[0035] The expression “configured to” as used in this disclosure may be replaced, depending on the context, with, for example, “suitable for,” “having the capacity to,” “designed to,” “adapted to,” “made to,” or “capable of.” The term “configured to” may not necessarily mean only “specifically designed to” in hardware.

[0036] In the embodiment, the 'module' or 'part' performs at least one function or operation and may be implemented in hardware or software, or a combination of hardware and software.

[0037] Meanwhile, the various elements and areas in the drawings are depicted schematically. Accordingly, the technical concept of the present invention is not limited by the relative sizes or spacing depicted in the attached drawings.

[0038] Hereinafter, embodiments according to the present disclosure are described in detail with reference to the attached drawings so that those skilled in the art can easily implement them.

[0039] The facilities according to the present disclosure may refer to structures and auxiliary facilities installed for a specific purpose, and may include bridges, underpasses, tunnels, etc.

[0040] FIG. 1 is a drawing exemplarily illustrating a facility and an expansion joint structure (10) of the facility according to one embodiment of the present disclosure. FIG. 2 is a drawing exemplarily illustrating a facility and an expansion joint structure (10) of the facility according to one embodiment of the present disclosure. FIG. 3 is a drawing exemplarily illustrating a cross-sectional view in the BB' direction of an expansion joint structure (10) of a facility according to one embodiment of the present disclosure. FIG. 4 is a drawing exemplarily illustrating a cross-sectional view in the BB' direction of an expansion joint structure (10) of a facility according to one embodiment of the present disclosure. FIG. 5 is a drawing exemplarily illustrating a cross-sectional view in the BB' direction of an expansion joint structure (10) of a facility according to one embodiment of the present disclosure.

[0041] Referring to FIGS. 1, 2 and 5, an expansion joint structure (10) according to one embodiment of the present disclosure may include a first facility paving layer (100), a second facility paving layer (200), an elastic member (300), and a sealing member (400).

[0042] The first facility paving layer (100) is configured to be formed in at least one area of ​​the upper surface of the slab (S1).

[0043] For example, the first facility paving layer (100) may be formed of an asphalt mixture, fiber-reinforced concrete, or polymer material, but is not limited thereto.

[0044] The second facility paving layer (200) is formed facing the first facility paving layer (100) in at least one area of ​​the upper surface of the other slab (S2), and is configured to be spaced further apart than the distance between the slab (S1) and the other slab (S2).

[0045] For example, the second facility paving layer (200) may be formed of fiber-reinforced concrete, reinforced plastic, or rubber-based material, but is not limited thereto.

[0046] The elastic member (300) is configured to be placed between a slab (S1) and another slab (S2).

[0047] For example, the elastic member (300) may include materials such as natural rubber, synthetic rubber, or thermoplastic elastomer, but is not limited thereto.

[0048] The sealing member (400) is configured to be positioned between the first facility packaging layer (100) and the second facility packaging layer (200) to seal the space between the first facility packaging layer (100) and the second facility packaging layer (200).

[0049] For example, the sealing member (400) may include a composition of fiber reinforced plastic (FRP), epoxy resin or polyurethane resin, etc., but is not limited thereto.

[0050] Referring to FIGS. 1, 2 and 5, a sealing member (400) according to one embodiment of the present disclosure may include a primer layer (410) and a first FRP member (420).

[0051] The primer layer (410) is configured such that the primer is applied to at least one area among the side of the slab (S1) facing another slab (S2), the side of the other slab (S2) facing the slab (S1), the side of the first facility paving layer (100) facing the second facility paving layer (200), the side of the second facility paving layer (200) facing the first facility paving layer (100), the area of ​​the upper surface of the slab (S1) where the first facility paving layer (100) is not formed, the area of ​​the upper surface of the other slab (S2) where the second facility paving layer (200) is not formed, and the upper surface of the elastic member (300).

[0052] For example, the primer layer (410) may be formed from an epoxy-based primer, a polyurethane primer, or an acrylic primer, but is not limited thereto.

[0053] The first FRP member (420) is formed by filling a composition containing fiber reinforced plastic (FRP) into at least one area of ​​a space defined as a region where a primer layer (410) is formed, and a virtual surface connecting the upper surface of a slab (S1) and the upper surface of another slab (S2).

[0054] For example, the first FRP member (420) may be made of glass fiber reinforced plastic (GFRP), carbon fiber reinforced plastic (CFRP), or aramid fiber reinforced plastic, but is not limited thereto.

[0055] Referring to FIGS. 1, FIGS. 2 and FIGS. 5, the first FRP member (420) according to one embodiment of the present disclosure may have a central area of ​​the upper surface formed flat.

[0056] Here, the sealing member (400) according to one embodiment of the present disclosure may include a cover member (430).

[0057] Specifically, the cover member (430) is a member provided to cover the upper surface of the first FRP member (420) corresponding to the gap between the slab (S1) and another slab (S2).

[0058] For example, the cover member (430) may be made of a material in which at least one of strength and durability is greater than a predetermined value so as to be able to support a load applied from the top.

[0059] For example, the cover member (430) may be made of plastic, reinforced plastic, aluminum, or other metal materials, but is not limited thereto.

[0060] According to the present disclosure, the durability of the expansion joint structure (10) can be increased by the cover member (430) despite the use of FRP material.

[0061] For example, the length of the cover member (430) in the longitudinal direction of the facility may be longer than the distance between slab (S1) and another slab (S2). As a result, durability against the load of the expansion joint structure (10) can be secured.

[0062] Referring to FIGS. 1, FIGS. 2 and FIGS. 5, a sealing member (400) according to one embodiment of the present disclosure may include a second FRP member (440).

[0063] The second FRP member (440) is formed by filling a composition including fiber reinforced plastic (FRP) in at least one area of ​​a space defined as a virtual surface connecting the upper surface of the first facility paving layer (100) and the upper surface of the second facility paving layer (200), the area where the primer layer (410) is formed, the cover member (430), and the first facility paving layer (100).

[0064] For example, the second FRP member (440) may be made of glass fiber reinforced plastic (GFRP), carbon fiber reinforced plastic (CFRP), or aramid fiber reinforced plastic, but is not limited thereto.

[0065] Meanwhile, an expansion joint structure (10) according to one embodiment of the present disclosure may include a coating layer.

[0066] The coating layer is formed by coating a composition containing fiber reinforced plastic (FRP) on at least one area of ​​the lower surface of the elastic member (300).

[0067] For example, the coating layer may be formed of glass fiber reinforced plastic (GFRP), carbon fiber reinforced plastic (CFRP), or aramid fiber reinforced plastic, but is not limited thereto.

[0068] Hereinafter, a method for installing an expansion joint structure (10) according to one embodiment of the present disclosure will be described.

[0069] Referring to FIG. 3, an elastic member (300) can be inserted into the gap between slab (S1) and another slab (S2). The insertion of the elastic member (300) can be performed during the installation of the facility, but can also be performed when replacing an aging elastic member (300) in a previously constructed facility.

[0070] Next, referring to FIG. 4, a primer may be applied to at least one of the following: the side of the slab (S1) facing another slab (S2), the side of the other slab (S2) facing the slab (S1), the side of the first facility paving layer (100) facing the second facility paving layer (200), the side of the second facility paving layer (200) facing the first facility paving layer (100), the upper surface of the slab (S1) where the first facility paving layer (100) is not formed, the upper surface of the other slab (S2) where the second facility paving layer (200) is not formed, and the upper surface of the elastic member (300). As a result, a primer layer (410) may be formed.

[0071] Next, referring to FIG. 4, a composition including FRP can be filled onto a primer layer (410) to form a first FRP member (420).

[0072] Next, referring to FIG. 4, a cover member (430) may be placed on the upper surface (which is formed flat) of the first FRP member (420). Here, the cover member (430) may be placed without applying a separate adhesive to ensure smooth operation of the expansion joint, but is not limited thereto.

[0073] Then, referring to FIG. 5, a composition including fiber reinforced plastic (FRP) can be filled in at least one area of ​​space defined as a virtual plane connecting the upper surface of the first facility paving layer (100) and the upper surface of the second facility paving layer (200), and a primer layer (410) formed therein, so that a second FRP member (440) can be formed.

[0074] Although not shown, a separate additional coating layer may be formed on the upper surface of the second FRP member (440), but is not limited thereto.

[0075] FIG. 6 is a drawing exemplarily illustrating a cross-sectional view of an expansion joint structure (10) of a facility according to one embodiment of the present disclosure. FIG. 7 is a drawing exemplarily illustrating a cross-sectional view of an elastic member (300) according to one embodiment of the present disclosure. FIG. 8 is a drawing exemplarily illustrating a cross-sectional view in the CC' direction of an expansion joint structure (10) of a facility according to one embodiment of the present disclosure.

[0076] Referring to FIGS. 6 to 8, an elastic member (300) according to one embodiment of the present disclosure may have a first diameter from the top to the bottom with respect to a first cross-section (310). Here, the first cross-section (310) is a cross-section in the central region with respect to the width direction of the facility.

[0077] Additionally, the elastic member (300) according to one embodiment of the present disclosure may have a second diameter in which the diameter from the top to the bottom is longer than the first diameter, based on the second cross-section (320). Here, the second cross-section (320) is a cross-section in the edge region based on the width direction of the facility.

[0078] Specifically, the height of the top in the first section (310) and the height of the top in the second section (320) may be the same. As a result, a virtual line defined by connecting the top sections with respect to the width direction of the facility can form a straight line.

[0079] According to the present disclosure, when installing an expansion joint structure (10) of a facility, the shape, curvature, and amount of FRP member inserted into the elastic member (300) of the expansion joint structure (10) at the top of the facility can be maintained consistently along the width direction of the facility, thereby increasing construction convenience.

[0080] Referring further to FIGS. 6 through 8, the height of the bottom in the first section (310) according to one embodiment of the present disclosure may be higher than the height of the bottom in the second section (320). As a result, a virtual line defined by connecting the bottom portions with respect to the width direction of the facility may form an arch curve.

[0081] According to the present disclosure, the lifespan of the elastic member (300) may be reduced due to moisture penetration on the lower surface of the elastic member (300), but when a virtual line defined by connecting the lower ends of the elastic member (300) forms an arch curve, a slope is formed from the center of the elastic member (300) toward the edge with respect to the width direction of the facility, so that the discharge of moisture can be carried out smoothly.

[0082] Furthermore, referring to FIGS. 6 to 8, the first cross-section (310) according to one embodiment of the present disclosure may be formed in a circular or elliptical shape.

[0083] And, the second section (320) may include a rectangular element (321), an upper curved element (322), and a lower curved element (323).

[0084] The rectangular element (321) is a cross-sectional element defined by a virtual first straight line running parallel to the face direction of the slab (S1) and intersecting the side of the slab (S1) and another slab (S2), a virtual second straight line running parallel to the first straight line and spaced apart by a predetermined distance, the side of the slab (S1) and the side of the other slab (S2).

[0085] The upper curved element (322) is a cross-sectional element that is connected at the top of the rectangular element (321), is convex upward, and forms the same curve as the top of the first cross-section (310) in at least one area.

[0086] The bottom curve element (323) is a cross-sectional element that is connected at the bottom of the rectangular element (321), is convex downward, and forms the same curve as the bottom of the first cross-section (310) in at least one area.

[0087] According to the present disclosure, when the second cross section (320) is composed of the cross section elements described above, the curves on the upper and lower surfaces along the longitudinal direction of the elastic member (300) can form a constant curvature.

[0088] As described above, when the second cross section (320) is composed of the cross section elements described above, when installing the expansion joint structure (10) along the width direction of the facility, the amount of material supplied from the upper surface of the elastic member (300) can be maintained at a constant level, so that a high-quality installation can be performed. In addition, moisture discharge from the lower surface of the elastic member (300) can also be facilitated.

[0089] Although preferred embodiments of the present disclosure have been illustrated and described above, the present disclosure is not limited to the specific embodiments described above. It is understood that various modifications can be made by those skilled in the art without departing from the essence of the present disclosure as claimed in the claims, and such modifications should not be understood individually from the technical spirit or perspective of the present disclosure. Explanation of the symbols

[0090] 10: Expansion joint structures 100: Pavement layer of the first facility 200: Second facility pavement layer 300: Elastic member 400: Sealing member

Claims

Claim 1 An expansion joint structure of a closed type installed in a facility, comprising: a first facility paving layer formed in at least one area of ​​the upper surface of a slab; a second facility paving layer formed opposite to the first facility paving layer in at least one area of ​​the upper surface of another slab disposed at a predetermined distance from the slab, and disposed further apart than the distance between the slab and the other slab; an elastic member disposed between the slab and the other slab; and a sealing member disposed between the first facility paving layer and the second facility paving layer and provided to seal the space between the first facility paving layer and the second facility paving layer. Claim 2 In claim 1, the sealing member comprises an expansion joint structure comprising a composition including fiber reinforced plastic (FRP). Claim 3 An expansion joint structure according to claim 1, wherein the sealing member comprises: a primer layer in which a primer is applied to at least one area among a side of the slab facing the other slab, a side of the other slab facing the slab, a side of the first facility paving layer facing the second facility paving layer, a side of the second facility paving layer facing the first facility paving layer, an area of ​​the upper surface of the slab where the first facility paving layer is not formed, an area of ​​the upper surface of the other slab where the second facility paving layer is not formed, and an upper surface of the elastic member; and a first FRP member formed by filling a composition comprising fiber reinforced plastic (FRP) in at least one area of ​​a space defined as an area in which the primer layer is formed, and a virtual surface connecting the upper surface of the slab and the upper surface of the other slab. Claim 4 An expansion joint structure comprising, in paragraph 3, a first FRP member having a central area of ​​its upper surface formed flat, and a sealing member having a cover member provided to cover the upper surface of the first FRP member corresponding to the gap between the slab and the other slab. Claim 5 An expansion joint structure according to claim 4, wherein the sealing member comprises a second FRP member formed by filling a composition including fiber reinforced plastic (FRP) in at least one area of ​​a space defined by a region in which a primer layer is formed, the cover member, and a virtual surface connecting the upper surface of the first facility paving layer and the upper surface of the second facility paving layer. Claim 6 In paragraph 5, the elastic member is an expansion joint structure having a first diameter from top to bottom based on a first cross-section in the central region based on the width direction of the facility, and a second diameter from top to bottom that is longer than the first diameter based on a second cross-section in the edge region based on the width direction of the facility. Claim 7 In claim 6, the elastic member is an expansion joint structure in which a virtual line defined by connecting the lower portions with respect to the width direction of the facility forms an arch curve, and a virtual line defined by connecting the upper portions with respect to the width direction of the facility forms a straight line. Claim 8 An expansion joint structure according to claim 7, wherein the first cross section is circular or elliptical, and the second cross section comprises: a rectangular element defined by a virtual first straight line running parallel to the face direction of the slab and intersecting the side of the slab and the other slab, a virtual second straight line parallel to the first straight line and spaced apart by a predetermined distance, the side of the slab and the side of the other slab; an upper curve element connected at the top of the rectangular element, convex upward, and forming the same curve as the top of the first cross section in at least one area; and a lower curve element connected at the bottom of the rectangular element, convex downward, and forming the same curve as the bottom of the first cross section in at least one area. Claim 9 In claim 8, the expansion joint structure comprises a coating layer formed by coating a composition including fiber reinforced plastic (FRP) on at least one area of ​​the lower surface of the elastic member.

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