Seismic isolation device and method for manufacturing the same

Abstract

Provided are a seismic isolation device having a high adhesion force to the surface of a U-shaped member, having a plurality of coating films, and having a high connectivity between the plurality of coating films, and a method for manufacturing the seismic isolation device. 【Solution means】The seismic isolation device 25 is a plastic hysteresis type seismic isolation device that restricts relative movement between an upper structure and a lower structure and attenuates the amount of movement. The seismic isolation device 25 includes a U-shaped member 70 formed of an elasto-plastic material. One end side of the U-shaped member 70 is fixed to the upper structure, and the other end side of the U-shaped member 70 is fixed to the lower structure. The surface of the U-shaped member 70 is provided with a first coating film 71a provided on the surface, a second coating film 71b provided on the first coating film, and a third coating film 71c provided on the second coating film. The first coating film 71a has a high adhesion force to the surface of the U-shaped member 70. The third coating film 71c has higher flexibility than the second coating film 71b. The second coating film 71b is an intermediate coating between the first coating film 71a and the third coating film 71c.

Description

Technical Field

[0001] The present disclosure relates to a seismic isolation device and a method for manufacturing the seismic isolation device.

Background Art

[0002] Conventionally, a seismic isolation device has been disclosed in which a primary treatment as rust prevention with adhesiveness to a topcoat (coating film) is applied, and then a paint that follows deformation is applied as a topcoat (see, for example, Patent Document 1). In addition, a seismic isolation device has been disclosed in which a coating film of paint is formed by an undercoat as a primary treatment for rust prevention and a topcoat as a secondary treatment (see, for example, Patent Document 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the prior art, it has not been sufficiently considered whether a topcoat can be satisfactorily formed on an undercoat, and there is room for improvement. In addition, the application of the above technology has been studied for a seismic isolation device including a U-shaped member formed of an elastoplastic material.

[0005] The present disclosure has been made in view of such problems, and an object thereof is to provide a seismic isolation device having high adhesion to the surface of a U-shaped member, having a plurality of coating films, and having high connectivity between the plurality of coating films, and a method for manufacturing the seismic isolation device.

Means for Solving the Problems

[0006] To solve the above problems, this disclosure proposes the following means. This disclosure relates to a plastic hysteresis type seismic isolation device that restricts relative movement between an upper structure and a lower structure and attenuates the amount of movement. The device includes a U-shaped member formed of an elasto-plastic material. One end side of the U-shaped member is fixed to the upper structure, and the other end side is fixed to the lower structure. On the surface of the U-shaped member, there are a first coating film provided on the surface, a second coating film provided on the first coating film, and a third coating film provided on the second coating film. The first coating film has a high adhesion to the surface of the U-shaped member, the third coating film has higher flexibility than the second coating film, and the second coating film is an intermediate coating between the first coating film and the third coating film.

[0007] Another aspect of this disclosure is a method for manufacturing a plastic hysteresis type seismic isolation device that restricts relative movement between an upper structure and a lower structure and attenuates the amount of movement by a U-shaped member formed of an elasto-plastic material, with one end side fixed to the upper structure and the other end side fixed to the lower structure. The method includes performing a rust prevention treatment on the surface of the U-shaped member with fine irregularities, forming a first coating film with high adhesion to the surface on the rust-prevented surface of the U-shaped member, forming a second coating film on the first coating film, and forming a third coating film with higher flexibility than the second coating film on the second coating film. The second coating film is an intermediate coating between the first coating film and the third coating film.

Advantages of the Invention

[0008] In the seismic isolation device and the method for manufacturing the seismic isolation device of this disclosure, it is possible to provide a seismic isolation device and a method for manufacturing the seismic isolation device that have a plurality of coating films with high adhesion to the surface of the U-shaped member, higher flexibility than the second coating film, and high connectivity between the plurality of coating films.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Mode for Carrying Out the Invention

[0010] Hereinafter, an embodiment of a seismic isolation device and a method for manufacturing the seismic isolation device according to the present disclosure will be described with reference to FIGS. 1 to 4. As shown in FIG. 1, the second seismic isolation device (seismic isolation device) 25 of the present embodiment is provided in the building 1. The building 1 includes columns 10, beams 15, a first seismic isolation device 20, and a second seismic isolation device 25.

[0011] The lower end of the column 10 is joined to the foundation 100. For example, the beam 15 is formed of H-shaped steel. The beam 15 extends along the horizontal plane. The ends of the beam 15 are joined to the columns 10.

[0012] The first seismic isolation device 20 is a known seismic isolation device that directly supports the load of the building 1 (column 10). The first seismic isolation device 20 is provided in a portion of the column 10 below the portion joined to the beam 15.

[0013] As shown in FIGS. 1 and 2, the second seismic isolation device 25 includes a lower base plate 26, a plurality of lower connection members 31, an upper base plate 36, a plurality of upper connection members 41, and an intermediate structure 51. For example, the lower base plate 26 and the upper base plate 36 are formed in a flat plate shape using a steel plate or the like. In this example, the lower base plate 26 and the upper base plate 36 have a rectangular shape when viewed along the vertical direction, which is the thickness direction of each. That is, the lower base plate 26 and the upper base plate 36 have four sides when viewed along the vertical direction.

[0014] In this example, the shape of the lower base plate 26 and the shape of the upper base plate 36 are equal to each other, and the size of the lower base plate 26 and the size of the upper base plate 36 are equal to each other. Note that at least one of these may be different from each other.

[0015] As shown in FIG. 2, a concrete injection hole (lower through hole) 27 is provided in the lower base plate 26. The concrete injection hole 27 has a circular shape when viewed along the vertical direction. The concrete injection hole 27 is provided at substantially the center (including the center) of the lower base plate 26 when viewed along the vertical direction. The size of the concrete injection hole 27 corresponds to the size (outer diameter) of an injection hose (not shown) for injecting concrete to manufacture a lower footing 60 described later. More specifically, the diameter of the concrete injection hole 27 is 150 mm or more. It is more preferable that the diameter of the concrete injection hole 27 is 200 mm or more.

[0016] Note that if the diameter of the concrete injection hole 27 is smaller than the outer diameter of the injection hose, specifically less than 150 mm, it becomes difficult to insert the injection hose 150 into the concrete injection hole 27 of the lower base plate 26. In the lower base plate 26, a hole having a diameter smaller than the outer diameter of the injection hose, specifically less than 150 mm, is a hole (ejection confirmation hole) for confirming that the concrete has been filled.

[0017] In the present embodiment, headed studs are used for the plurality of lower connecting members 31 and the plurality of upper connecting members 41. The multiple lower connection members 31 are arranged in a lattice pattern when viewed in the up-down direction, and protrude downward from the lower base plate 26. When viewed in the vertical direction, the multiple lower connection members 31 are arranged so as not to overlap the concrete injection hole 27. It should be noted that the plurality of lower connection members 31 and the plurality of upper connection members 41 are not limited to headed studs.

[0018] The multiple upper connection members 41 are arranged in a lattice pattern when viewed in the up-down direction, and protrude upward from the upper base plate 36.

[0019] The intermediate structure 51 is detachably fixed between the upper base plate 36 and the lower base plate 26 . As will be described later, the intermediate structure 51 restricts the relative movement between the upper base plate 36 and the lower base plate 26, and attenuates the amount of movement. The intermediate structure 51 has a plurality of connecting members 52, a plurality of lower fixing members 53, and a plurality of upper fixing members (not shown).

[0020] First, the outer shape of each connecting member 52 will be described below. Next, the internal structure of each connecting member 52, including a coating film laminate 71 described below, will be described. Each connecting member 52 has a U-shape in a side view of the connecting member 52 (see FIG. 1). Each connecting member 52 has a lower straight portion 52a, an upper straight portion 52b, and a curved portion 52c. The lower linear portion 52a and the upper linear portion 52b are disposed parallel to each other and extend along a horizontal plane. The upper linear portion 52b is disposed higher than the lower linear portion 52a. The upper linear portion 52b and the lower linear portion 52a face each other in the vertical direction.

[0021] The curved portion 52c is curved so as to be convex toward a first side in the direction in which the linear portions 52a and 52b extend. In a side view, the central angle of the curved portion 52c is approximately 180°. The first end of the curved portion 52c is continuous with the end of the lower linear portion 52a on the first side. The second end of the curved portion 52c, which is opposite to the first end, is continuous with the end of the upper linear portion 52b on the first side.

[0022] Note that the curved portion 52c may be configured by joining the ends of a plurality of curved portions with linear portions. That is, a linear portion extending in a predetermined direction may be included in a part of the curved portion 52c.

[0023] Next, each connecting member 52 will be described. As shown in FIG. 3, each connecting member 52 has a U-shaped member 70 and a coating film laminate 71. The U-shaped member 70 is formed of an elastoplastic material such as a steel plate. The U-shaped member 70 is made of steel or the like. Here, the elastoplastic material means a material that can be deformed both elastically and plastically in response to an external force. Although not shown, fine irregularities are provided on the surface 70a of the U-shaped member 70. As will be described later, the irregularities may be formed by shot blasting or the like. The coating film laminate 71 is disposed on the surface 70a of the U-shaped member 70. The coating film laminate 71 has a first coating film 71a, a second coating film 71b, and a third coating film 71c.

[0024] The first coating film 71a is provided on the surface 70a of the U-shaped member 70. The first coating film 71a has a high adhesion to the surface 70a of the U-shaped member 70. As the first coating film 71a, for example, a material having an adhesion higher than that of an organic zinc-rich paint to the surface 70a is adopted. Note that the adhesion of the first coating film 71a is the strain (the maximum strain within the elastic region. Yield strain) at the yield point of the elastoplastic material, which is ε yWhen defined as such, it is preferable that it does not peel off until a strain of 10ε. y It is preferable that it does not peel off until the strain of y . In addition, the adhesion of the first coating film 71a preferably has an adhesion such that peeling does not occur at earthquake vibration level 1 and peeling begins at earthquake vibration level 2. In addition, the adhesion of the first coating film 71a preferably has an adhesion such that the upper structure 16 does not peel off even when it relatively moves 50 cm along the horizontal plane from a state where no external force is acting on the lower structure 101 described later. The first coating film 71a may be provided, for example, with a thickness of about 50 μm using a modified epoxy resin.

[0025] The third coating film 71c is provided on the second coating film 71b. The third coating film 71c preferably has higher flexibility than the second coating film 71b. In addition, the third coating film 71c preferably has high weather resistance. As the third coating film 71c, for example, a material having higher flexibility than an epoxy resin is adopted. The third coating film 71c may be in a specified color. The third coating film 71c may be provided, for example, with a thickness of about 30 μm using a flexible polyurethane resin.

[0026] The second coating film 71b is provided on the first coating film 71a. The second coating film 71b is an intermediate coat between the first coating film 71a and the third coating film 71c. The second coating film 71b and the third coating film 71c are preferably formed of different types of flexible paints. Here, the flexible paint is a paint that expands and contracts at normal temperature, has higher flexibility than the first coating film 71a, and follows. In addition, for example, it is preferable that the second coating film 71b is made white to improve the color development of the third coating film 71c and improve the appearance of the coating film laminate 71. The second coating film 71b may be provided, for example, with a thickness of about 100 μm using a flexible epoxy resin.

[0027] As shown in Fig. 2, each connecting member 52 is arranged so as to protrude outward from the lower base plate 26 and the upper base plate 36. That is, in a plan view, each connecting member 52 is arranged such that the outer sides of the base plates 26 and 36 are the first sides. In this example, at least one of the plurality of connecting members 52 is arranged on each side of the base plates 26 and 36. More specifically, the same number (two in this embodiment) of connecting members 52 are arranged on each side of the base plates 26 and 36. Note that the arrangement of the plurality of connecting members 52 is not limited to this, and at least one of the plurality of connecting members 52 does not have to be arranged on all sides of the base plates 26 and 36.

[0028] Bolts or the like are used for the plurality of lower fixtures 53 and the plurality of upper fixtures (not shown). Each lower fixture 53 fixes the end portion on the second side in the extending direction of the lower linear portion 52a and the lower base plate 26 to each other in the lower linear portion 52a. Each upper fixture fixes the end portion on the second side and the upper base plate 36 to each other in the upper linear portion 52b.

[0029] As shown in Fig. 1, for example, the lower base plate 26 of the second seismic isolation device 25 is joined to the foundation 100 via the lower footing 60. However, it is not limited to this, and the footing 60 may not be provided. In the case of a steel frame structure, the lower base plate 26 may be connected to a bracket or the like connected to the steel frame. Note that the lower base plate 26, the lower footing 60, and the foundation 100 constitute the lower structure 101. That is, the other end side of the U-shaped member 70 is fixed to the lower structure 101. The plurality of lower connecting members 31 are studs and are embedded in the lower footing 60. However, the plurality of lower connecting members 31 are not limited to studs and may be constituted by blind nuts and bolts embedded in the lower footing 60. In the case of a steel frame structure, the plurality of lower connecting members 31 may be constituted by bolts and nuts.

[0030] The upper base plate 36 of the second seismic isolation device 25 is joined to the beam 15 via the upper footing 65. Note that the upper base plate 36, the upper footing 65, and the beam 15 constitute the upper structure 16. That is, one end side of the U-shaped member 70 is fixed to the upper structure 16. The plurality of upper connecting members are studs and are embedded in the upper footing 65. However, the plurality of upper connecting members are not limited to studs and may be constituted by blind nuts and bolts embedded in the upper footing 65. Note that the lower footing 60 and the upper footing 65 are formed of, for example, concrete.

[0031] As described above, the second seismic isolation device 25 is connected to the beam 15 so as not to directly support the load of the building 1 (column 10). Note that the configuration of the lower structure and the configuration of the upper structure are not limited to this.

[0032] The second seismic isolation device 25 configured as described above operates as follows. For example, when the upper base plate 36 moves (displaces) in a direction along the horizontal plane with respect to the lower base plate 26 due to an earthquake or the like, the plurality of connecting members 52 undergo elastic deformation and plastic deformation. At that time, the plurality of connecting members 52 absorb energy. At this time, the intermediate structure 51 restricts the relative movement between the upper structure 16 and the lower structure 101 and attenuates the amount of movement between the upper structure 16 and the lower structure 101. The second seismic isolation device 25 is a plastic hysteresis type seismic isolation device.

[0033] Next, regarding the method for manufacturing the second seismic isolation device 25 configured as described above (hereinafter simply referred to as the manufacturing method), an explanation will be given with an emphasis on the manufacturing of the connecting member 52. FIG. 4 is a flowchart showing the manufacturing method S1. First, in the U-shaped member manufacturing step S10, fine irregularities are formed on the surface 70a of the U-shaped member 70. For example, the irregularities are formed by blasting. Then, the surface 70a of the U-shaped member 70 on which the irregularities are formed is subjected to rust prevention treatment. As the rust prevention treatment, for example, a method of forming a thin primer paint (temporary painting, protective painting) can be used. When the U-shaped member manufacturing step S10 is completed, the process proceeds to the first coating film forming step S11.

[0034] Next, in the first coating film forming step S11, a first coating film 71a is formed on the surface 70a of the rust prevention-treated U-shaped member 70. The first coating film 71a has a high adhesion to the surface 70a of the U-shaped member 70. The first coating film 71a is preferably formed of, for example, a modified epoxy resin paint. When the first coating film forming step S11 is completed, the process proceeds to the second coating film forming step S12. Next, in the second coating film forming step S12, a second coating film 71b is formed on the first coating film 71a. When the second coating film forming step S12 is completed, the process proceeds to the third coating film forming step S13.

[0035] Next, in the third coating film forming step S13, a third coating film 71c is formed on the second coating film 71b. The third coating film 71c has higher flexibility than the second coating film 71b. The second coating film 71b is an intermediate coat between the first coating film 71a and the third coating film 71c. The second coating film 71b and the third coating film 71c are formed of different types of flexible paints. The second coating film 71b is preferably formed of, for example, a flexible epoxy resin paint. The third coating film 71c may be formed of, for example, a flexible polyurethane resin paint. When the third coating film forming step S13 is completed, all steps of the manufacturing method S1 are completed, and the connecting member 52 is manufactured.

[0036] In addition, in the second seismic isolation device 25, the peeling state of the coating films 71a, 71b, and 71c after a major earthquake may be used as an index for replacing the U-shaped member 70. It is preferable that the criteria for the peeling state of the coating films 71a, 71b, and 71c are determined in advance. For example, when visible cracks occur in the third coating film 71c, the U-shaped member 70 may be replaced. Alternatively, when peeling occurs in the third coating film 71c, the U-shaped member 70 may be replaced. Alternatively, when cracks or peeling occur in the second coating film 71b and the third coating film 71c and the first coating film 71a can be visually observed to be exposed, the U-shaped member 70 may be replaced.

[0037] As described above, in the second seismic isolation device 25 of the present embodiment, the U-shaped member 70 having one end fixed to the superstructure 16 and the other end fixed to the substructure 101 elastically deforms and plastically deforms, thereby restricting the relative movement between the superstructure 16 and the substructure 101 and damping the amount of movement. The first coating film 71a can be surely adhered to the surface 70a of the U-shaped member 70. Among the first coating film 71a, the second coating film 71b, and the third coating film 71c, the outermost third coating film 71c can increase the flexibility and the overall durability. And the second coating film 71b can surely connect the first coating film 71a and the third coating film 71c. As described above, it is possible to provide the second seismic isolation device 25 in which the first coating film 71a increases the adhesion to the surface 70a of the U-shaped member 70, the third coating film 71c increases the flexibility, and the second coating film 71b has high connectivity between the first coating film 71a and the third coating film 71c.

[0038] By using the first coating film 71a, the second coating film 71b, and the third coating film 71c configured as described above, for example, the second coating film 71b and the third coating film 71c are peeled off from the U-shaped member 70 at about 60% of the number of repetitions until breakage due to an earthquake. Therefore, it is possible to more accurately detect that the breakage of the U-shaped member 70 of the second seismic isolation device 25 is approaching. Thereby, the U-shaped member 70 can be used until near breakage, and the number of times of maintaining (repairing) the second seismic isolation device 25 including the U-shaped member 70 can be reduced.

[0039] Fine irregularities are provided on the surface 70a of the U-shaped member 70. These fine irregularities can increase the contact area with the first coating film 71a and more reliably adhere the first coating film 71a to the surface 70a of the U-shaped member 70.

[0040] Also, according to the manufacturing method S1 of the present embodiment, when the U-shaped member 70 with one end fixed to the superstructure 16 and the other end fixed to the substructure 101 elastically deforms and plastically deforms, the relative movement between the superstructure 16 and the substructure 101 can be restricted and the amount of movement can be attenuated. The first coating film 71a can be reliably adhered to the surface 70a of the U-shaped member 70. Among the first coating film 71a, the second coating film 71b, and the third coating film 71c, since the outermost third coating film 71c has high flexibility, the durability of the second seismic isolation device 25 as a whole can be enhanced. And the second coating film 71b which is an intermediate coat can reliably connect the first coating film 71a and the third coating film 71c. As described above, it is possible to provide a manufacturing method S1 of the second seismic isolation device 25 that enhances the adhesion force of the first coating film 71a to the surface 70a of the U-shaped member 70, enhances the durability of the second seismic isolation device 25 by the third coating film 71c, and has high connectivity between the first coating film 71a and the third coating film 71c by the second coating film 71b.

[0041] And due to the rust-proof treated fine unevenness, the contact area between the surface 70a of the U-shaped member 70 and the first coating film 71a can be increased, and the first coating film 71a can be more reliably adhered to the surface 70a of the U-shaped member 70.

[0042] The unevenness of the U-shaped member 70 can be formed, for example, by a blasting process. Note that the unevenness of the U-shaped member 70 provided without performing the blasting process may be utilized. The second coating film 71b and the third coating film 71c are formed of different types of flexible paints. The third coating film 71c has higher flexibility than the second coating film 71b. Since the second coating film 71b has higher affinity with the first coating film 71a than the third coating film 71c, the second coating film 71b functions as an intermediate coating material between the third coating film 71c and the first coating film 71a.

[0043] Further, in the second seismic isolation device 25 manufactured by the manufacturing method S1 of the present embodiment, the second seismic isolation device 25 is manufactured using the manufacturing method S1 in which the adhesion force to the surface of the U-shaped member 70 is high and the connectivity between the coating films 71a, 71b, and 71c is high. The peeling state of the coating film after a major earthquake can be used as an index for replacing the U-shaped member 70.

[0044] As described above, one embodiment of the present disclosure has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and modifications, combinations, deletions, etc. of the configuration within the scope not departing from the gist of the present disclosure are also included. For example, in the second seismic isolation device 25 of the above embodiment, fine unevenness may not be provided on the surface 70a of the U-shaped member 70. Also, in the manufacturing method S1, the unevenness of the U-shaped member 70 may be formed by a process other than the blasting process. The second coating film 71b and the third coating film 71c may be formed of the same type of flexible paint.

[0045] The coating laminate 71 is not limited to the surface 70a of the U-shaped member 70, and may be provided on at least one of the surface of the lower base plate 26, the surface of the upper base plate 36, the surfaces of the plurality of lower connecting members 31, and the surfaces of the plurality of upper connecting members.

[0046] (Addendum) (1) Aspect 1 of the present disclosure is a plastic hysteresis type seismic isolation device that restricts relative movement between an upper structure and a lower structure and attenuates the amount of movement, and includes a U-shaped member formed of an elasto-plastic material. One end side of the U-shaped member is fixed to the upper structure, the other end side of the U-shaped member is fixed to the lower structure, and on the surface of the U-shaped member, there are provided a first coating film provided on the surface, a second coating film provided on the first coating film, and a third coating film provided on the second coating film. The first coating film has a high adhesion to the surface of the U-shaped member, the third coating film has higher flexibility than the second coating film, and the second coating film is an intermediate coating between the first coating film and the third coating film.

[0047] In this disclosure, by elastic deformation and plastic deformation of a U-shaped member with one end side fixed to the upper structure and the other end side fixed to the lower structure, relative movement between the upper structure and the lower structure can be restricted, and the amount of movement can be attenuated. The first coating film can be reliably adhered to the surface of the U-shaped member. Among the first coating film, the second coating film, and the third coating film, the outermost third coating film can be made into a coating film with higher flexibility than the second coating film. And the second coating film, which is an intermediate coating, can reliably connect the first coating film and the third coating film. As described above, it is possible to provide a seismic isolation device that enhances the adhesion of the first coating film to the surface of the U-shaped member and has high connectivity between the first coating film and the third coating film due to the second coating film.

[0048] (2) Aspect 2 of the present disclosure may be the seismic isolation device according to (1), in which fine irregularities are provided on the surface of the U-shaped member. In this disclosure, due to the fine unevenness, the contact area between the surface of the U-shaped member and the first coating film can be increased, and the first coating film can be more reliably adhered to the surface of the U-shaped member.

[0049] (3)Aspect 3 of this disclosure may be the seismic isolation device according to (1) or (2), wherein the second coating film and the third coating film are formed of different types of flexible paints. In this disclosure, the second coating film and the third coating film can be made difficult to crack during plastic deformation of the U-shaped member, difficult to peel off from the U-shaped member, and the materials forming the second coating film and the third coating film can be diversified.

[0050] (4)Aspect 4 of this disclosure is a method for manufacturing a plastic hysteresis type seismic isolation device that restricts relative movement between the superstructure and the substructure and attenuates the amount of movement by a U-shaped member fixed at one end to the superstructure and fixed at the other end to the substructure and formed of an elasto-plastic material. The method includes performing a rust prevention treatment on the surface of the U-shaped member with fine unevenness, forming a first coating film with high adhesion to the surface on the surface of the rust prevention treated U-shaped member, forming a second coating film on the first coating film, forming a third coating film with higher flexibility than the second coating film on the second coating film, and the second coating film is an intermediate coating between the first coating film and the third coating film.

[0051] In this disclosure, a U-shaped member fixed at one end to the superstructure and fixed at the other end to the substructure can elastically deform and plastically deform, thereby restricting relative movement between the superstructure and the substructure and attenuating the amount of movement. The first coating film can be reliably adhered to the surface of the U-shaped member. Among the first coating film, the second coating film, and the third coating film, the outermost third coating film can be made a coating film with higher flexibility than the second coating film. And the second coating film, which is an intermediate coating, can reliably connect the first coating film and the third coating film. As described above, it is possible to provide a method for manufacturing a seismic isolation device that enhances the adhesion to the surface of the U-shaped member by the first coating film and has high connectivity between the first coating film and the third coating film by the second coating film.

[0052] And due to the rust-proof treated fine irregularities, the contact area between the surface of the U-shaped member and the first coating film can be increased, and the first coating film can be more reliably adhered to the surface of the U-shaped member.

[0053] (5) Aspect 5 of the present disclosure may be the method for manufacturing a seismic isolation device according to (4), wherein the irregularities are formed by a blasting process. In this disclosure, the irregularities can be easily formed by a known blasting process.

[0054] (6) Aspect 6 of the present disclosure may be the method for manufacturing a seismic isolation device according to (4) or (5), wherein the second coating film and the third coating film are formed of different types of flexible paints. In this disclosure, the second coating film and the third coating film can be made less likely to crack during plastic deformation of the U-shaped member and less likely to peel off from the U-shaped member, and the materials forming the second coating film and the third coating film can be diversified.

[0055] (7) Aspect 7 of the present disclosure is a seismic isolation device according to any one of (1) to (3), wherein the peeling state of the coating film after a major earthquake serves as an index for replacing the U-shaped member. In this disclosure, since it is a seismic isolation device with high adhesion to the surface of the U-shaped member and high connectivity between the plurality of coating films, the peeling state of the coating film after a major earthquake can be used as an index for replacing the U-shaped member.

[0056] (8) Aspect 8 of the present disclosure is a seismic isolation device according to any one of (1) to (3), wherein the first coating film is a modified epoxy resin, the second coating film is a flexible epoxy resin, and the third coating film is a flexible polyurethane resin. According to this disclosure, the seismic isolation devices of aspects (1) to (3) of the present disclosure can be realized.

[0057] (9) Aspect 9 of the present disclosure is a seismic isolation device according to any one of (4) to (6), wherein the first coating film is formed of a modified epoxy resin paint, the second coating film is formed of a flexible epoxy resin paint, and the third coating film is formed of a flexible polyurethane resin paint, and is a method for manufacturing a seismic isolation device. According to this disclosure, the seismic isolation devices of aspects (4) to (6) of the present disclosure can be realized.

Explanation of reference numerals

[0058] 16 Superstructure 25 Second seismic isolation device (seismic isolation device) 70 U-shaped member 70a Surface 71a First coating film 71b Second coating film 71c Third coating film 101 Substructure S1 Manufacturing method (method for manufacturing a seismic isolation device)

Claims

1. A plastic hysteresis type seismic isolation device that restricts relative movement between an upper structure and a lower structure and attenuates the amount of movement, comprising: a U-shaped member formed of an elasto-plastic material; one end side of the U-shaped member is fixed to the upper structure, and the other end side of the U-shaped member is fixed to the lower structure; on the surface of the U-shaped member, a first coating film provided on the surface; a second coating film provided on the first coating film; a third coating film provided on the second coating film; the first coating film has a high adhesion to the surface of the U-shaped member; the third coating film is more flexible than the second coating film; the second coating film is an intermediate coating between the first coating film and the third coating film, a seismic isolation device.

2. The seismic isolation device according to claim 1, wherein fine irregularities are provided on the surface of the U-shaped member.

3. The seismic isolation device according to claim 1, wherein the second coating film and the third coating film are formed of different types of flexible paints.

4. A method for manufacturing a plastic hysteresis type seismic isolation device that restricts relative movement between an upper structure and a lower structure and attenuates the amount of movement by a U-shaped member formed of an elasto-plastic material, one end side of which is fixed to the upper structure and the other end side of which is fixed to the lower structure, comprising: rust-proofing the surface of the U-shaped member on which fine irregularities are formed; forming a first coating film having a high adhesion to the surface on the rust-proofed surface of the U-shaped member; forming a second coating film on the first coating film; forming a third coating film having higher flexibility than the second coating film on the second coating film; the second coating film is an intermediate coating between the first coating film and the third coating film, a method for manufacturing a seismic isolation device.

5. The method for manufacturing a seismic isolation device according to claim 4, wherein the irregularities are formed by a blasting process.

6. The method for manufacturing a seismic isolation device according to claim 4, wherein the second coating film and the third coating film are formed of different types of flexible paints.

7. A seismic isolation device according to any one of claims 1 to 3, wherein the peeling state of the coating film after a major earthquake serves as an index for replacing the U-shaped member, a seismic isolation device.

8. the first coating film is a modified epoxy resin; the second coating film is a flexible epoxy resin; the third coating film is a flexible polyurethane resin, a seismic isolation device according to any one of claims 1 to 3.

9. the first coating film is formed of a modified epoxy resin paint; The second coating film is formed of a flexible epoxy resin paint, The third coating film is formed of a flexible polyurethane resin paint. A method for manufacturing a seismic isolation device according to any one of claims 4 to 6.

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