Base isolation damper and base isolation structure

Abstract

To provide a base isolation damper capable of suppressing excessive deformation of an attenuation member to reliably exhibit attenuation performance even when relatively large displacement occurs in a horizontal direction and a vertical direction due to large-scale earthquake motion.SOLUTION: A base isolation damper 6 is installed between a structure lower part 4 and a foundation 5, and operates during large-scale earthquake motion. The base isolation damper comprises: an attenuation member 10 having one end fixed to one of the structure lower part and the foundation; a displacement unit 15 fixed to the other end of the attenuation member and arranged opposite the other of the structure lower part and the foundation; an attenuation operating unit 16 that is arranged on the other of the structure lower part and the foundation, and transmits a horizontal relative displacement of the displacement unit during large-scale earthquake motion to the attenuation member; and rotational displacement regulation units 4a, 18 that regulate the displacement unit from rotating while tilting relative to a horizontal plane during the large-scale earthquake motion.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a seismic isolation damper that operates during large-scale earthquake motion and a seismic isolation structure equipped with the seismic isolation damper. [Background technology]

[0002] In order to increase safety against large-scale earthquake motion, architectural structures such as skyscrapers and large civil engineering structures are equipped with seismic isolation devices such as seismic isolation rubber between the bottom of the structure and the foundation to absorb earthquake motion. In this seismic isolation structure, when the earthquake force increases, the horizontal relative displacement (hereinafter referred to as horizontal displacement) that occurs in the architectural structure and the foundation becomes very large, and there is a risk that the equipment inside the building will be damaged. For this reason, there is known a seismic isolation structure in which the seismic isolation device absorbs minute vibrations for small displacements that occur normally and small to medium-sized earthquake motions, and the seismic isolation damper is activated in the event of large-scale earthquake motions (for example, the seismic isolation dampers in Patent Documents 1 and 2).

[0003] The seismic isolation damper in Patent Document 1 comprises a damping member (referred to as a metal damper in Patent Document 1) whose upper end is fixed to the lower surface of a lower part of a structure (referred to as an upper structure in Patent Document 1) and whose lower end is arranged on the upper surface of a foundation (referred to as a lower structure) so as to be freely movable along a horizontal direction, a disk-shaped base provided integrally with the lower end of the damping member, and a ring-shaped abutment part formed on the upper surface of the foundation into which the base fits. Then, when there is a large horizontal displacement due to a large-scale earthquake motion, the outer peripheral surface of the base abuts against the inner peripheral surface of the abutment part, causing the damping member to deform and absorb the energy of the large-scale earthquake motion.

[0004] Moreover, the seismic isolation damper of Patent Document 2 includes a damping member (referred to as a metal damping member in Patent Document 2) whose lower end is fixed to a foundation (referred to as a pedestal in Patent Document 2), a displacement part (referred to as a second vertical part in Patent Document 2) that protrudes vertically from the lower surface of the lower part of the structure (referred to as a floor beam in Patent Document 2), a rectangular flange fixed to the lower end of the displacement part, and a number of stoppers fixed to the upper end of the damping member and sandwiched in an opposing state with gaps provided between the four sides and the top and bottom surfaces of the flange. During a large-scale earthquake, the side part of the flange that moves horizontally abuts against the side part of the inner wall of the stopper arranged on the moving side, causing the damping member to deform and absorb the energy of the large-scale earthquake.

[0005] Here, the seismic isolation steel damper of Patent Document 3, previously applied for by the same applicant, has its upper and lower base plates rigidly connected to the lower part of the structure and the foundation, acting as a beam fixed at both ends. As a result, the bending moment acting on the seismic isolation steel damper is suppressed and the deformation behavior is mainly in response to shear forces acting in the horizontal direction, and this plastic deformation absorbs energy during an earthquake. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 6087605 (Figs. 1 to 4) [Patent Document 2] JP 2022-186790 A (FIGS. 11 to 13) [Patent Document 3] Patent No. 7140344 Summary of the Invention [Problem to be solved by the invention]

[0007] In contrast, in the seismic isolation damper of Patent Document 1, the upper end of the damping member is rigidly connected to the building structure, but the lower end of the damping member is not fixed to the foundation, and the damping member is arranged in a cantilever state. Therefore, when a large horizontal displacement occurs between the building structure and the foundation due to a large earthquake motion, the bending moment acting on the damping member becomes excessively large, and buckling or breakage occurs easily. As a result, the seismic isolation damper of Patent Document 1 may not be able to absorb sufficient energy during an earthquake. In addition, when the damping member arranged in a cantilever state swings, the base provided at the lower end of the damping member rotates while tilting with respect to the horizontal plane, and the base that should be in contact with the abutment portion provided on the upper surface of the foundation may come out of the abutment portion, and the damping function against large-scale earthquake motion may be lost.

[0008] In the seismic isolation damper of Patent Document 2, multiple independent stoppers fixed to the upper end of the damping member are arranged with gaps between the upper and lower surfaces of the flange fixed to the lower end of the displacement section, so when a large horizontal displacement occurs, the load is concentrated on several independent stoppers that contact the sides of the flange, making the stoppers prone to damage. Also, because the stoppers are arranged on the sides of the square plate, the contact distance varies depending on the direction in which the plate moves in the horizontal plane, causing variation in the behavior of the damping member and preventing normal damping performance.

[0009] In view of the above, the present invention aims to provide a seismic isolation damper that can reliably exert its damping performance by suppressing excessive deformation of the damping member even when a large relative displacement occurs in the horizontal direction due to a large earthquake motion, and also to provide a seismic isolation structure that can prevent the energy of a large earthquake motion from being directly transmitted to a structure. [Means for solving the problem]

[0010] In order to achieve the above-mentioned object, one embodiment of the present invention provides a seismic isolation damper that is installed between the lower part of a structure and a foundation and operates during large-scale seismic motion, and includes a damping member having one end fixed to one of the lower part of the structure and the foundation, a displacement part fixed to the other end of the damping member and positioned opposite the other of the lower part of the structure and the foundation, a damping operation part that is positioned on the other of the lower part of the structure and the foundation and transmits the horizontal relative displacement of the displacement part during large-scale seismic motion to the damping member, and a rotation control part that controls the displacement part from rotating while tilting relative to the horizontal plane.

[0011] In addition, a seismic isolation structure according to one embodiment of the present invention includes the above-mentioned seismic isolation steel damper and a seismic isolation device that is installed between the lower part of the structure and the foundation and moves horizontally while supporting the vertical load of the structure in the event of normal small displacement or small to medium-sized earthquake motion, thereby absorbing the energy of small horizontal displacement. Effect of the Invention

[0012] The seismic isolation damper according to the present invention can suppress excessive deformation of the damping member and reliably exhibit damping performance even when a large relative displacement occurs in the horizontal direction due to a large earthquake motion. Also, the seismic isolation structure according to the present invention can prevent the energy of the earthquake motion from being directly transmitted to the structure. [Brief description of the drawings]

[0013] [Figure 1] 1 is a diagram showing a seismic isolation structure of a first embodiment according to the present invention; [Diagram 2] 2 is a perspective view showing a connection portion and a displacement plate of a damping member and a damping operating portion that constitute the seismic isolation damper of the first embodiment. FIG. [Diagram 3] 1A and 1B are diagrams illustrating a structure of a seismic isolation damper according to a first embodiment. [Figure 4] FIG. 4 is a view taken along line AA in FIG. [Diagram 5] 4A to 4C are diagrams illustrating the behavior of the seismic isolation damper of the first embodiment in the event of a large-scale earthquake motion. [Figure 6] FIG. 6 is a view taken along line BB in FIG. 5. [Figure 7] 11A and 11B are diagrams illustrating the structure of a seismic isolation damper according to a second embodiment. [Figure 8] 8 is a view taken along the line CC in FIG. 7. [Figure 9] 11A to 11C are diagrams illustrating the behavior of the seismic isolation damper of the second embodiment in the event of a large-scale earthquake motion. [Figure 10] FIG. 10 is a view taken along the line DD in FIG. [Figure 11] FIG. 11 is a diagram showing a seismic isolation structure according to a third embodiment of the present invention. [Figure 12] 13A and 13B are diagrams illustrating the structure of a seismic isolation damper according to a third embodiment. [Figure 13] 13 is a view taken along line EE in FIG. 12. [Figure 14] 13A to 13C are diagrams illustrating the behavior of the seismic isolation damper of the third embodiment in the event of a large-scale earthquake motion. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Next, an embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are given the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between thickness and planar dimensions, the thickness ratio of each layer, etc., differ from the actual ones. Therefore, the specific thickness and dimensions should be determined with reference to the following description. In addition, it goes without saying that the drawings include parts with different dimensional relationships and ratios. In addition, the embodiments shown below are merely examples of devices and methods for embodying the technical idea of ​​the present invention, and the technical idea of ​​the present invention does not specify the materials, shapes, structures, arrangements, etc. of the components to those described below. The technical idea of ​​the present invention can be modified in various ways within the technical scope defined by the claims.

[0015] [First embodiment] 1 to 6 show a seismic isolation structure 3 of a first embodiment installed between a structure 1, such as an architectural structure such as a skyscraper or a large civil engineering structure, and a foundation 2. As shown in Fig. 1, the seismic isolation structure 3 includes a seismic isolation damper 6 installed between a damper upper structure 4 provided at the bottom of a structure 1 and a damper lower structure 5 provided on a foundation 2, and a seismic isolation device 9 installed between an equipment upper structure 7 provided at the bottom of the structure 1 adjacent to the damper upper structure 4 and an equipment lower structure 8 provided on the foundation 2 adjacent to the damper lower structure 5. Although only one set of seismic isolation structures 3 is shown in Fig. 1, multiple sets are installed between the structure 1 and the foundation 2. The damper upper structure 4, the damper lower structure 5, the equipment upper structure 7 and the equipment lower structure 8 are made of reinforced concrete. The seismic isolation damper 6 includes a damping member 10 and a damping actuator 11 .

[0016] 2, the damping member 10 is composed of four seismic isolation plates 10a, 10b, 10c, and 10d extending in cross directions perpendicular to each other in a plan view, and a connecting portion 13 constituting a damping operating portion 11 is fixed to an upper end portion 12 where the upper ends of the four seismic isolation plates 10a, 10b, 10c, and 10d overlap each other. A lower substrate 14 is fixed to a portion where the lower ends of the four seismic isolation plates 10a, 10b, 10c, and 10d overlap each other, and the lower substrate 14 is fixed to the damper lower structure 5.

[0017] As shown in FIG. 3, the damping operating part 11 comprises a connecting part 13 fixed to the upper end 12 of the damping member 10, a disk-shaped displacement plate 15 coaxially fixed to the upper part of the connecting part 13, a ring-shaped horizontal displacement operating member 16 fixed to the lower surface 4a of the damper upper structure 4 and surrounding the outer periphery of the displacement plate 15, and a disk-shaped first rotation limiting member 18 fixed to the lower end of the horizontal displacement operating member 16 with a connecting bolt 17 and having a central through hole 18a formed therein. As shown in Fig. 2, the connecting portion 13 has a cylindrical steel pipe 13c, which is smaller in diameter than the upper connecting plate 13a and the lower connecting plate 13b, fixed between them, and the upper and lower ends of a plurality of ribs 13d, which are fixed at predetermined intervals in the circumferential direction on the outer periphery of the cylindrical steel pipe 13, are fixed to the upper connecting plate 13a and the lower connecting plate 13b. A displacement plate 15 is coaxially fixed to the upper connecting plate 13a of the connecting portion 13. It is present.

[0018] The first rotation restricting member 18 is formed by fixing two semi-circular arc members 18b and 18c to the horizontal displacement operating member 16. The outer diameter of the first rotation restricting member 18 is formed to be the same size as the outer diameter of the horizontal displacement operating member 16. The inner diameter d1 of the central through hole 18a of the first rotation restricting member 18 is set to be smaller than the outer diameter D1 of the displacement plate 15 (d1 < D1) as shown in FIG. 4. Thereby, as shown in FIG. 3, the outer peripheral side of the disk-shaped displacement plate 15 is horizontally displaced It is arranged in a state surrounded from the horizontal direction and the vertical direction by the inner peripheral surface of the horizontal displacement operating member 16, the lower surface 4a of the upper structure 4 for the damper, and the upper surface 18d of the first rotation restricting member 18.

[0019] Also, when the vertical interval between the lower surface 4a of the upper structure 4 for the damper and the upper surface 18d of the first rotation restricting member 18 is H1 and the thickness of the displacement plate 15 is S1, it is set to 4 mm ≤ H1 - S1 ≤ 10 mm. Note that the lower part of the structure of the present invention corresponds to the upper structure 4 for the damper, and the foundation of the present invention corresponds to the lower structure 5 for the damper.

[0020] Next, the operation and effect of the seismic isolation structure 3 of the first embodiment will be described. In the seismic isolation structure 3 of the first embodiment, during normal minute displacements and medium and small seismic motions, a small horizontal relative displacement (hereinafter referred to as horizontal displacement) occurs between the structure 1 and the foundation 2, and the seismic isolation device 9 operates to absorb the energy of the small horizontal displacement. Further, in the seismic isolation damper 6, no matter in which direction in the horizontal plane the displacement plate 15 is horizontally displaced slightly, the displacement plate 15 does not contact the inner periphery of the horizontal displacement operating member 16, and the four seismic isolation plates 10a, 10b, 10c, and 10d constituting the damping member 10 do not deform, so the damping performance is not exhibited.

[0021] On the other hand, FIG. 5 shows the behavior of the seismic isolation damper 6 when a large-scale seismic motion occurs. When a large-scale seismic motion occurs, a large horizontal displacement occurs between the structure 1 and the foundation 2. When a large horizontal displacement occurs, the displacement plate 15 that has been horizontally displaced to a large extent in any direction in the horizontal plane comes into contact with the inner peripheral surface of the horizontal displacement operating member 16, and the four seismic isolation plates 10a, 10b, 10c, and 10d that constitute the damping member 10 of the seismic isolation damper 6 deform in both shear and bending directions. Since the four seismic isolation plates 10a, 10b, 10c, and 10d are arranged in a cross shape in a plan view, even if a large earthquake motion acts in any direction in the horizontal plane, any one of the seismic isolation plates 10a, 10b, 10c, and 10d will deform in both shear and bending directions to absorb the energy of the earthquake motion, preventing the energy of the large earthquake motion from being directly transmitted to the structure 1.

[0022] Here, when a large horizontal displacement occurs between the structure 1 and the foundation 2 due to the occurrence of a large earthquake motion, a rotational force acts on the displacement plate 15 in contact with the inner peripheral surface of the horizontal displacement actuation member 16, causing it to rotate while tilting with respect to the horizontal plane. If the rotation of the displacement plate 15 is not restricted when a rotational force acts on the displacement plate 15, the displacement plate 15 behaves as a cantilever beam, and a large bending moment acts in addition to a horizontal force on the four seismic isolation plates 10a, 10b, 10c, and 10d fixed to the displacement plate 15 via the connecting parts 13. As a result, the seismic isolation plates 10a and 10b are excessively deformed as shown by the two-dot chain line in Fig. 5, and may come into contact with the first rotation restriction member 18, or may buckle or break.

[0023] In contrast, in this embodiment, when the displacement plate 15 comes into contact with the inner peripheral surface of the horizontal displacement operating member 16, a part of the upper surface of the displacement plate 15 (the part indicated by reference numeral 15a in FIGS. 5 and 6) comes into contact with the lower surface 4a of the damper upper structure 4, and a part of the lower surface of the displacement plate 15 (the part indicated by reference numeral 15b in FIGS. 5 and 6) comes into contact with the periphery of the upper surface 18d of the central through hole 18a of the first rotation restricting member 18, and the vertical distance H1 between the lower surface 4a of the damper upper structure 4 and the upper surface 18d of the first rotation restricting member 18 and the displacement Since the thickness S1 of the plate 15 is set to 4 mm≦H1−S1≦10 mm, the rotation of the displacement plate 15 is suppressed.

[0024] In this way, even when a large-scale seismic motion is input, the rotation of the displacement plate 15 is suppressed, and the bending moment acting on the four seismic isolation plates 10a, 10b, 10c, and 10d is suppressed to a state of fixed beams at both ends. As shown by the solid lines in Figure 5, normal deformation in both the shear direction and bending direction occurs, so there is no risk of contact with the first rotation control member 18, etc., and sufficient energy absorption capacity is demonstrated without buckling or breakage of the members. In addition, a portion of the underside of the displacement plate 15 whose rotation is restricted (the area indicated by symbol 15b in Figures 5 and 6) contacts the peripheral edge of the upper surface 18d of the central through hole 18a of the first rotation restricting member 18, thereby preventing the displacement plate 15 from slipping out to the outside through the central through hole 18a of the first rotation restricting member 18.

[0025] Therefore, in the seismic isolation damper 6 of this embodiment, even if a large horizontal displacement occurs between the structure 1 and the foundation 2 due to the occurrence of a large-scale seismic movement, the rotation of the displacement plate 15 is suppressed by the displacement plate 15 coming into contact with the underside 4a of the damper upper structure 4 and the upper surface 18d of the first rotation control member 18, so that the suppressed bending moment in the state of a beam fixed at both ends is transmitted to the damping member 10 fixed to the displacement plate 15 via the connecting portion 13, and normal deformation in both the shear direction and bending direction occurs, and the displacement plate 15 does not slip out to the outside through the central through hole 18a of the first rotation control member 18, so that normal damping performance can be exhibited and the energy of large-scale seismic movement can be absorbed.

[0026] Furthermore, since the horizontal displacement operating member 16 and the first rotation restricting member 18 are continuous cylindrical, stress from an external force acting on the contact point of the displacement plate 15 is dispersed and not concentrated, eliminating the risk of damage to the members. Furthermore, since the displacement plate 15 is disk-shaped and the horizontal displacement operating member 16 is cylindrical, the contact distance in all horizontal directions is constant, there is no variation in the behavior of the damping member 10, and normal damping performance can be achieved.

[0027] In the seismic isolation damper 6 of the first embodiment, the lower part of the damping member 10 is fixed to the damper lower structure 5, the displacement plate 15 constituting the damping operation unit 11 is fixed to the upper part of the damping member 10 via the connecting part 13, and the horizontal displacement operation member 16 and the first rotation restriction member 18 constituting the damping operation unit 11 are fixed to the lower surface 4a of the damper upper structure 4, but the gist of the present invention is not limited to this. That is, even if the upper part of the damping member 10 is fixed to the lower surface 4a of the damper upper structure 4, the displacement plate 15 constituting the damping operation unit 11 is fixed to the lower part of the damping member 10 via the connecting part 13, and the horizontal displacement operation member 16 and the first rotation restriction member 18 constituting the damping operation unit 11 are fixed to the upper surface of the damper lower structure 5, the same effects as those of the first embodiment can be obtained.

[0028] [Second embodiment] 7 to 10 show a seismic isolation structure 3 according to a second embodiment. Note that the same components as those shown in the first embodiment are given the same reference numerals and the description thereof will be omitted. As shown in Fig. 7, the relationship between the vertical distance H2 between the lower surface 4a of the damper upper structure 4 and the upper surface 18d of the first rotation restricting member 18 and the thickness S2 of the displacement plate 15 is set to 4 mm ≦ H2 - S2 ≦ 10 mm. Also, as shown in Fig. 8, the inner diameter d2 of the central through hole 18a of the first rotation restricting member 18 is set to the same dimension as the outer diameter D2 of the displacement plate 15 (d2 = D2). When a large horizontal displacement occurs between the structure 1 and the foundation 2 due to a large earthquake motion, a rotational force acts on the displacement plate 15 in contact with the inner surface of the horizontal displacement actuating member 16, causing it to rotate while tilting relative to the horizontal plane, as shown in Figure 9.

[0029] In this embodiment, as shown in Figures 9 and 10, the portion indicated by the symbol 15a on the upper surface of the displacement plate 15 that contacts the inner surface of the horizontal displacement operating member 16 contacts the lower surface 4a of the damper upper structure 4, and two portions indicated by the symbol 15c on the lower surface of the displacement plate 15 contact the upper surface 18d on the periphery of the central through hole 18a of the first rotation restricting member 18, and the relationship between the vertical distance H2 between the lower surface 4a of the damper upper structure 4 and the upper surface 18d of the first rotation restricting member 18 and the thickness S2 of the displacement plate 15 is set to 4 mm ≦ H2-S2 ≦ 10 mm, thereby suppressing rotation of the displacement plate 15.

[0030] In this way, even when a large-scale seismic movement is input, the rotation of the displacement plate 15 is suppressed, and the bending moment acting on the four seismic isolation plates 10a, 10b, 10c, and 10d is suppressed to a state of fixed beams at both ends. As in the first embodiment, normal deformation in both the shear direction and bending direction occurs, so there is no risk of contact with the first rotation control member 18, etc., and sufficient energy absorption capacity is demonstrated without buckling or breakage of the members. In addition, two portions 15c on the underside of the displacement plate 15, where rotation is restricted, contact the peripheral edge of the upper surface 18d of the central through hole 18a of the first rotation restricting member 18, so that the displacement plate 15 does not slip out to the outside through the central through hole 18a of the first rotation restricting member 18.

[0031] Therefore, even if a large horizontal displacement occurs between the structure 1 and the foundation 2 due to a large earthquake motion, the displacement plate 15 comes into contact with the lower surface 4a of the damper upper structure 4 and the upper surface 18d of the first rotation restriction member 18, so that the rotation of the displacement plate 15 is restricted, and the restricted bending moment in the state of a beam fixed at both ends is transmitted to the damping member 10 fixed to the displacement plate 15 via the connecting portion 13, and normal deformation in both the shear direction and bending direction occurs, and the displacement plate 15 does not slip out of the central through hole 18a of the first rotation restriction member 18. Therefore, normal damping performance is exhibited, and the energy of large earthquake motion can be absorbed.

[0032] [Third embodiment] 11 to 14 show a seismic isolation structure 3 according to a third embodiment. Note that the same components as those shown in the first embodiment are given the same reference numerals and the description thereof will be omitted. As shown in Figure 11, the seismic isolation structure 3 includes a seismic isolation damper 20 installed between a damper upper structure 4 provided at the bottom of a structure 1 and a damper lower structure 5 provided on a foundation 2, and a seismic isolation device 9 installed between an equipment upper structure 7 provided at the bottom of the structure 1 adjacent to the damper upper structure 4 and an equipment lower structure 8 provided on the foundation 2 adjacent to the damper lower structure 5.

[0033] As shown in Figures 12 and 13, the seismic isolation damper 20 includes a damping member 10 and a damping actuator 21. Note that, in Figure 12, of the four seismic isolation plates 10a, 10b, 10c, and 10d of the damping member 10, only the seismic isolation plates 10a and 10b are shown. As shown in Fig. 12, the upper ends of the four seismic isolation plates 10a, 10b, 10c, and 10d are fixed to a displacement plate 22 that constitutes the damping operation unit 21. Also, as shown in Fig. 12, the lower ends of the four seismic isolation plates 10a, 10b, 10c, and 10d are fixed to a lower substrate 14.

[0034] As shown in Figure 12, the damping operating section 21 comprises the aforementioned displacement plate 22 having a central through hole 22a, a flat-plate-shaped first rotation restricting member 23 fixed to the underside 4a of the damper upper structure 4, a cylindrical horizontal displacement operating member 24 fixed to the first rotation restricting member 23 and extending downward through the central through hole 22a of the displacement plate 22, and a disk-shaped second rotation restricting member 25 fixed to the lower end of the horizontal displacement operating member 24 and facing the first rotation restricting member 23 while contacting the underside of the displacement plate 22.

[0035] As shown in FIG. 13, the inner diameter d3 of the central through hole 22a of the displacement plate 22 is set to the second rotation restricting member The dimensions are set to be equal to or less than the outer diameter D3 of 25 (d3≦D3). As shown in FIG. 12, if the thickness of the displacement plate 22 is S3 and the vertical distance between the lower surface of the first rotation restricting member 23 and the upper surface of the second rotation restricting member 25 is H3, then 4 mm ≦ H3-S3 It is set to ≦10mm.

[0036] Next, the effects of the seismic isolation structure 3 of the third embodiment will be described. In the seismic isolation structure 3 of the third embodiment, in the event of normal minute displacement or small to medium earthquake motion, the seismic isolation device 9 operates to absorb horizontal displacement energy. Also, in the seismic isolation damper 20, the horizontal displacement operating member 24 of the damping operating section 21 is horizontally displaced slightly in any direction within the horizontal plane, but the horizontal displacement operating member 24 does not come into contact with the central through-hole 22a of the displacement plate 22, and the four seismic isolation plates 10a, 10b, 10c, and 10d that constitute the damping member 10 do not deform, so the damping performance is not exhibited.

[0037] When a large earthquake occurs and a large horizontal displacement occurs between the structure 1 and the foundation 2, the horizontal displacement actuating member 24, which has been largely horizontally displaced in any direction within the horizontal plane, comes into contact with the central through-hole 22a of the displacement plate 22, and the displacement plate 22 is displaced in the horizontal direction, as shown in Fig. 14. As a result, the four seismic isolation plates 10a, 10b, 10c, and 10d undergo both shear deformation and bending deformation, absorbing the energy of the earthquake motion and preventing the energy of the large earthquake motion from being directly transmitted to the structure 1.

[0038] Here, in this embodiment, when the displacement plate 22 comes into contact with the horizontal displacement operating member 24, a part of the lower surface of the displacement plate 22 (the part indicated by symbol 22b in Figure 14) comes into contact with the upper surface of the second rotation regulating member 25, and a part of the upper surface of the displacement plate 22 (the part indicated by symbol 22c in Figure 14) comes into contact with the lower surface of the first rotation regulating member 23. Since the relationship between the vertical distance H3 between the lower surface of the first rotation regulating member 23 and the upper surface of the second rotation regulating member 25 and the thickness S3 of the displacement plate 22 is set to 4 mm ≦ H3-S3 ≦ 10 mm, the first rotation regulating member 23 and the second rotation regulating member 25 suppress the behavior of the displacement plate 22 rotating while tilting relative to the horizontal plane.

[0039] In this way, even when a large-scale seismic movement is input, the rotation of the displacement plate 22 is suppressed, and the bending moment acting on the four seismic isolation plates 10a, 10b, 10c, and 10d is suppressed to a state of fixed beams at both ends.By performing normal shear deformation and bending deformation, there is no risk of contacting the underside 4a of the damper upper structure 4, and the seismic isolation plates 10a, 10b, 10c, and 10d do not buckle or break, so sufficient energy absorption capacity is demonstrated.

[0040] Therefore, in the seismic isolation damper 20 of this embodiment, even if a large horizontal displacement occurs between the structure 1 and the foundation 2 due to the occurrence of a large-scale seismic movement, the rotation of the displacement plate 22 is suppressed, and the bending moment acting on the damping member 10 to which the displacement plate 22 is fixed is suppressed to the state of a beam fixed at both ends, and normal deformation in both the shear direction and bending direction occurs, so that normal damping performance can always be exhibited.

[0041] In the seismic isolation damper 20 of the third embodiment, the lower part of the damping member 10 is fixed to the damper lower structure 5, the displacement plate 22 constituting the damping operation unit 21 is fixed to the upper part of the damping member 10, and the first rotation restriction member 23, the horizontal displacement operation member 24, and the second rotation restriction member 25 constituting the damping operation unit 21 are fixed to the lower surface 4a of the damper upper structure 4, but the gist of the present invention is not limited to this. That is, even if the upper part of the damping member 10 is fixed to the lower surface 4a of the damper upper structure 4, the displacement plate 22 constituting the damping operation unit 21 is fixed to the lower part of the damper member 10, and the first rotation restriction member 23, the horizontal displacement operation member 24, and the second rotation restriction member 25 constituting the damping operation unit 21 are fixed to the upper surface of the damper lower structure 5, the same effects as those of the second embodiment can be obtained. [Explanation of symbols]

[0042] 1 structure 2 Basics 3. Earthquake-proof structure 4. Damper upper structure 4a Underside of upper structure for damper 5. Lower structure for damper 6 Seismic damper 7 Upper structure for equipment 8 Lower structure for equipment 9 Seismic isolation device 10 Damping member 10a, 10b, 10c, 10d Seismic isolation plate 11 Damping actuator 12 Upper end 13 Connecting part 13a Upper connection plate 13b Lower connecting plate 13c Cylindrical steel pipe 13d Rib 14 Lower Board 15 Displacement plate 16 Horizontal displacement operating member 17 Connecting bolt 18 First rotation restricting member 18a Center through hole 18b, 18c Semicircular arc member 20 Seismic damper 21 Damping actuator 22 Displacement plate 22a Center through hole 23 First rotation restricting member 24 Horizontal displacement operating member 25 Second rotation restricting member d1, d2, d3 Inner diameter of central through hole D1, D2 Outer diameter of displacement plate D3 Outer diameter of second rotation restricting member S1, S2, S3 Thickness of displacement plate H1 Vertical distance between the bottom surface of the upper structure for the damper and the top surface of the rotation restraint member H2: Vertical distance between the first rotation restricting member and the second rotation restricting member H3: Vertical distance between the bottom surface of the first rotation restricting member and the top surface of the second rotation restricting member

Claims

1. A seismic damper that is installed between the bottom of a structure and the foundation and operates during large-scale earthquake motion. a damping member having one end fixed to one of the lower portion of the structure and the foundation; a displacement portion fixed to the other end of the damping member and disposed opposite the other of the lower portion of the structure and the foundation; a damping operating unit that is disposed on the other of the lower portion of the structure and the foundation and that transmits a horizontal relative displacement of the displacement unit to the damping member when a large-scale earthquake occurs; A seismic isolation damper comprising: a rotational displacement regulating section that regulates the displacement section from rotating while tilting relative to a horizontal plane during large-scale earthquake motion.

2. the displacement portion is a disk-shaped displacement plate fixed to the other end of the damping member via a connecting portion, the damping actuation part is a horizontal displacement actuation member having a circular ring shape that is fixed to the lower part of the structure and the other surface of the foundation and surrounds an outer periphery of the displacement plate, The seismic isolation damper described in claim 1, characterized in that the rotational displacement regulating portion is composed of a first rotation regulating member in a disk shape fixed to the horizontal displacement operating member with a central through hole through which the connecting portion passes, and the lower part of the structure and the other surface of the foundation, and these clamp the displacement plate from the vertical direction to regulate the rotation of the displacement plate.

3. 3. The seismic isolation damper according to claim 2, wherein the inner diameter of the central through hole of the first rotation restricting member is set to a dimension equal to or smaller than the outer diameter of the displacement plate, which is in a circular plate shape.

4. the displacement portion is a displacement plate having a central through hole and fixed to the other end of the damping member, the damping actuation portion is a columnar horizontal displacement actuation member protruding from a first rotation restricting member fixed to the lower portion of the structure and the other surface of the foundation and penetrating the central through hole provided in the displacement plate, The seismic isolation damper described in claim 1, characterized in that the rotational displacement regulating portion is composed of the first rotation regulating member and a circular plate-shaped second rotation regulating member fixed to the open end of the horizontal displacement operating member, and these members clamp the displacement plate from the vertical direction to regulate the rotation of the displacement plate.

5. 5. The seismic isolation damper according to claim 4, wherein the inner diameter of the central through hole of the displacement plate is set to a dimension equal to or smaller than the outer diameter of the second rotation restricting member, which is circular.

6. 2. The seismic isolation damper according to claim 1, wherein the damping member is composed of four seismic isolation plates extending in a cross direction in a plan view.

7. A seismic isolation structure comprising: a seismic isolation damper according to any one of claims 1 to 6; and a seismic isolation device that is installed between the lower part of a structure and a foundation and that moves horizontally while supporting the vertical load of the structure in the event of constant minute displacement or small to medium-sized earthquake motion, thereby absorbing the energy of small horizontal displacement.

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