Seismic isolation mechanism

Abstract

To provide a seismic isolation mechanism that can suppress displacement of an isolation layer even under large seismic forces.SOLUTION: A seismic isolation mechanism 1 is placed in a seismic isolation layer S formed between a lower structure 11 and an upper structure 16 located above the lower structure 11 and is provided with: a plurality of seismic isolation devices 2A, 2B that are fixed to one of the lower structure 11 and the upper structure 16 and support the upper structure 16 movably in a horizontal direction during an earthquake; and displacement control devices 3A, 3B that are fixed to a side facing the seismic isolation devices 2 on the other side of the lower structure 11 and the upper structure 16 and support each of the seismic isolation devices 2 movably in the horizontally direction during an earthquake. In the displacement control devices 3A and 3B, which support the plurality of seismic isolation devices 2A and 2B, friction coefficients are different, and a wall section 4 is installed on the outer circumference side of the seismic isolation device 2B with a smaller friction coefficient.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a seismic isolation mechanism.

Background Art

[0002] In recent years, in building structures, there may be a need for measures against ground motions that exceed the ground motions for seismic design assumed conventionally. In this case, in a seismic isolation structure, values exceeding the conventionally considered allowable values are required for the maximum displacement and maximum velocity allowed in the seismic isolation layer.

[0003] For this reason, a configuration has been proposed in which an elastic body is installed between an upper supported body and a lower support body, and sliding materials are provided on both the upper and lower surfaces of the elastic body to double the movable range of the seismic isolation layer (see Patent Document 1 below).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] [[ID=3​​​​​​​​​​​​​In other words, the seismic isolation mechanism according to the present invention comprises a plurality of seismic isolation devices arranged in a seismic isolation layer formed between a substructure and a superstructure positioned above the substructure, fixed to either the substructure or the superstructure, and supporting the superstructure so as to be movable in the horizontal direction during an earthquake; and a displacement control device fixed to the other surface of the substructure or the superstructure facing the seismic isolation devices, and supporting each of the seismic isolation devices so as to be movable in the horizontal direction during an earthquake, wherein the displacement control device supporting the plurality of seismic isolation devices has different coefficients of friction, and a wall portion is installed on the outer circumference side of the seismic isolation device with the smaller coefficient of friction.

[0008] In this type of seismic isolation mechanism, in the first stage when a horizontal load acts on the superstructure, the displacement control device with the smaller coefficient of friction is displaced horizontally, and the seismic isolation device with the lower rigidity is also displaced. The first stage ends when the seismic isolation device supported by the displacement control device with the smaller coefficient of friction comes into contact with the wall. In the second stage, when the horizontal load on the superstructure increases further, the displacement control device with the larger coefficient of friction is displaced horizontally, and the seismic isolation device with the higher rigidity is also displaced. In this way, by installing displacement control devices with different coefficients of friction, the timing at which multiple seismic isolation devices begin to bear seismic force (horizontal load) can be staggered, thus suppressing the displacement of the seismic isolation layer even under large seismic forces.

[0009] Furthermore, in the seismic isolation mechanism according to the present invention, the displacement control device includes a sliding plate fixed to the surface of the other of the lower structure and the upper structure facing the seismic isolation device, and a sliding material fixed to the surface of the seismic isolation device facing the other of the lower structure and the upper structure, and which is slidable relative to the sliding plate, and the wall portion may be installed on the outer circumference side of the seismic isolation device where the coefficient of friction between the sliding plate and the sliding material is smaller.

[0010] In this seismic isolation mechanism, the displacement control device is configured to include a sliding plate and a sliding material. By changing the coefficient of friction between the sliding plate and the sliding material, the coefficient of friction of the displacement control device can be changed, allowing for easy control of the coefficient of friction.

[0011] Furthermore, in the seismic isolation mechanism according to the present invention, the displacement control device with the smaller coefficient of friction is a linear guide, and the displacement control device with the larger coefficient of friction may include a sliding plate fixed to the surface of the other of the lower structure and the upper structure facing the seismic isolation device, and a sliding material fixed to the surface of the seismic isolation device facing the other of the lower structure and the upper structure, and slidable relative to the sliding plate.

[0012] In this seismic isolation mechanism, the displacement control device with a low coefficient of friction is a linear guide. The displacement control device with a high coefficient of friction is configured with a sliding plate and a sliding material, and the coefficient of friction of the displacement control device can be changed by changing the coefficient of friction between the sliding plate and the sliding material, thus allowing the coefficient of friction to be controlled in a simple manner.

[0013] Furthermore, in the seismic isolation mechanism according to the present invention, the sliding plate is fixed to the upper surface of the lower structure. The sliding material may be fixed to the lower surface of the seismic isolation device.

[0014] In this seismic isolation mechanism, the sliding plate is fixed to the upper surface of the lower structure, and the sliding material is fixed to the lower surface of the seismic isolation device. Therefore, the sliding plate and sliding material can be easily installed.

[0015] Furthermore, in the seismic isolation mechanism according to the present invention, the wall portion may be provided so as to be erected upward from the lower structure.

[0016] In this type of seismic isolation mechanism, the wall sections are erected above the lower structure. Therefore, the wall sections can be constructed as an integral part of the lower structure or fixed to the lower structure, resulting in good constructability for the wall sections.

[0017] In the seismic isolation mechanism according to the present invention, the wall portion may be disposed over the entire outer periphery of the seismic isolation device.

[0018] In the seismic isolation mechanism configured as described above, the wall portion is disposed over the entire outer periphery of the seismic isolation device. Therefore, movement of the seismic isolation device in any direction along the horizontal plane can be restricted.

[0019] In the seismic isolation mechanism according to the present invention, a cushioning material may be provided on the surface of the wall portion facing the seismic isolation device.

[0020] In the seismic isolation mechanism configured as described above, a cushioning material is provided on the surface of the wall portion facing the seismic isolation device. Therefore, it is possible to mitigate the impact when the seismic isolation device collides with the wall portion, and to suppress damage to the seismic isolation device and the wall portion.

[0021] In the seismic isolation mechanism according to the present invention, the seismic isolation device may be formed by laminating laminated rubber and steel plates.

[0022] In the seismic isolation mechanism configured as described above, the seismic isolation device is formed by laminating laminated rubber and steel plates. Therefore, it can follow in any direction along the horizontal plane, and residual displacement after an earthquake can be suppressed by the laminated rubber having a large restoring force.

Advantages of the Invention

[0023] According to the seismic isolation mechanism of the present invention, displacement of the seismic isolation layer can be suppressed even by a large seismic force.

Brief Description of the Drawings

[0024] [Figure 1] It is a schematic elevational view showing a seismic isolation mechanism according to an embodiment of the present invention. [Figure 2] It is a diagram showing the behavior of a seismic isolation mechanism according to an embodiment of the present invention, (a) showing normal times, (b) showing the behavior at the first stage, and (c) showing the behavior at the second stage. [Figure 3]This figure shows the relationship between load and deformation in a seismic isolation mechanism according to one embodiment of the present invention. [Figure 4] In the verification of a seismic isolation mechanism according to one embodiment of the present invention, the figure shows the load deformation results of the input seismic wave OS1, where (a) shows the case with only the seismic isolation mechanism, (b) shows the case with an oil damper, and (c) shows the entire seismic isolation layer including the oil damper. [Figure 5] In the verification of a seismic isolation mechanism according to one embodiment of the present invention, the figure shows the load deformation results of the input seismic wave TCU068, where (a) shows the case with only the seismic isolation mechanism, (b) shows the case with an oil damper, and (c) shows the entire seismic isolation layer including the oil damper. [Figure 6] In the comparative example, the figures show the load deformation results of the input seismic wave OS1, with (a) showing the case with seismic isolation device 2A and displacement control device 3A, (b) showing the case with an oil damper, and (c) showing the case with seismic isolation device 2A, displacement control device 3A and an oil damper. [Figure 7] In the comparative example, the figures show the load deformation results for the input seismic wave TCU068, with (a) showing the case with seismic isolation device 2A and displacement control device 3A, (b) showing the case with an oil damper, and (c) showing the case with seismic isolation device 2A, displacement control device 3A and an oil damper. [Modes for carrying out the invention]

[0025] A seismic isolation mechanism according to one embodiment of the present invention will be described with reference to the drawings. Figure 1 is a schematic elevation view showing a seismic isolation mechanism according to one embodiment of the present invention. As shown in Figure 1, the seismic isolation mechanism 1 is installed in the seismic isolation layer S between the substructure 11 and the superstructure 16 located above the substructure 11. The substructure 11 is, for example, a foundation and is made of reinforced concrete. The superstructure 16 is, for example, a building and is made of reinforced concrete. Note that the structure of the substructure 11 and the structure of the superstructure 16 are not limited to reinforced concrete.

[0026] The seismic isolation mechanism 1 comprises a plurality of seismic isolation devices 2, a displacement control device 3 provided on each of the plurality of seismic isolation devices 2, and a stopper 4. The stopper 4 corresponds to the wall portion of the claim. Figure 1 shows two of the seismic isolation devices 2 installed in the seismic isolation layer S of the building.

[0027] The seismic isolation device 2 is fixed to the superstructure 16 and supports the superstructure 16 so that it can move horizontally during an earthquake.

[0028] The seismic isolation device 2 has a lower flange 21, an upper flange 22, and laminated rubber 23. The seismic isolation device 2 has a well-known configuration such as natural rubber laminated rubber, lead-plugged laminated rubber, or high-damping laminated rubber.

[0029] The lower flange 21 is formed in a flat plate shape. The plate surface of the lower flange 21 is oriented in the vertical direction. The lower flange 21 is installed above the sliding plate 31, which will be described later.

[0030] The upper flange 22 is positioned above the lower flange 21. The upper flange 22 is formed in a flat plate shape. The plate surface of the upper flange 22 is oriented in the vertical direction. The upper flange 22 is fixed to the superstructure 16 by fasteners (not shown).

[0031] The laminated rubber 23 is positioned between the lower flange 21 and the upper flange 22. The laminated rubber 23 is composed of, for example, multiple disc-shaped laminated rubbers and multiple disc-shaped steel plates that are alternately laminated.

[0032] The displacement control device 3 is fixed to the upper surface 11u of the substructure 11. The displacement control device 3 is installed below each of the multiple seismic isolation devices 2. The displacement control device 3 supports the seismic isolation devices 2 so that they can move horizontally. The displacement control device 3 has a sliding plate 31 and a sliding material 32. The upper surface 11u of the substructure 11 corresponds to the surface of the substructure 11 according to the claim that faces the seismic isolation devices 2.

[0033] The sliding plate 31 is fixed to the upper surface 11u of the lower structure 11 with fasteners (not shown). The sliding plate 31 is made of a high-friction material. For example, the sliding plate 31 is made of a stainless steel plate.

[0034] The sliding material 32 is fixed to the lower surface 21d of the lower flange 21. The sliding material 32 is a component for reducing the coefficient of sliding friction. The sliding material 32 is positioned above the sliding plate 31. The sliding material 32 is slidable relative to the sliding plate 31. The sliding material 32 can be made of, for example, polytetrafluoroethylene (PTFE), also known as Teflon (registered trademark). The lower surface 21d of the lower flange 21 corresponds to the surface facing the lower structure 11 in the seismic isolation device of the claim.

[0035] In the displacement control devices 3 installed on the two seismic isolation devices 2 shown in Figure 1, the displacement control device 3 shown on the left side of Figure 1 is designated as displacement control device 3A, and the displacement control device 3 shown on the right side is designated as displacement control device 3B.

[0036] The friction coefficients are different in the displacement control devices 3A and 3B. The friction coefficient between the sliding plate 31 (referred to as "sliding plate 31B") and the sliding material 32 (referred to as "sliding material 32B") of the displacement control device 3B is smaller than the friction coefficient between the sliding plate 31 (referred to as "sliding plate 31A") and the sliding material 32 (referred to as "sliding material 32A") of the displacement control device 3A.

[0037] The stopper 4 is installed on the outer circumference of the seismic isolation device 2 (referred to as "seismic isolation device 2B"), on which the displacement control device 3B, which has a low coefficient of friction, is installed. The distance between the stopper 4 and the lower flange 21 of the seismic isolation device 2B is indicated by length A0. The stopper 4 is arranged around the entire outer circumference of the seismic isolation device 2B. In plan view, the stopper 4 is arranged in an annular or square frame shape. Note that the stopper 4 does not need to be arranged around the entire outer circumference as long as it is spaced horizontally apart from the seismic isolation device 2. A seismic isolation device 2 without a stopper 4 is referred to as "seismic isolation device 2A".

[0038] The stopper 4 is erected upward from the lower structure 11. The stopper 4 may be formed integrally with the lower structure 11, or it may be fixed to the lower structure 11.

[0039] A cushioning material (not shown) may be provided on the inner surface 4a of the stopper 4. The inner surface 4a of the stopper 4 corresponds to the surface of the stopper 4 according to the claim that faces the displacement control device 3B.

[0040] Figure 2 shows the behavior of seismic isolation mechanism 1, with (a) showing the behavior during normal operation, (b) showing the behavior in the first stage, and (c) showing the behavior in the second stage. As shown in Figure 2(a), under normal conditions, the laminated rubber 23 of the seismic isolation device 2 is not deformed, and the upper flange 22 is positioned directly above the lower flange 21.

[0041] As shown in Figure 2(b), when a horizontal load is applied to the superstructure 16, the sliding material 32B begins to slide on the sliding plate 31B on the seismic isolation device 2B side where the coefficient of friction between the sliding plate 31 and the sliding material 32 is smaller. As the sliding material 32B slides, the superstructure 16, which is supported by the seismic isolation device 2B to which the sliding material 32B is fixed, is displaced horizontally. As the superstructure 16 is displaced horizontally, the laminated rubber 23 of the seismic isolation device 2A (hereinafter referred to as "laminated rubber 23A") deforms. In this first stage, the laminated rubber 23 of the seismic isolation device 2B (hereinafter referred to as "laminated rubber 23B") is not deformed, and the sliding material 32A on the seismic isolation device 2A side is not sliding. In the first stage, the laminated rubber 23A bears the horizontal load. In this case, the rigidity of the laminated rubber 23A is assumed to be lower than the rigidity of the laminated rubber 23B.

[0042] Length A1 represents the horizontal sliding length of the sliding material 32B, the horizontal displacement length of the superstructure 16, and the horizontal deformation length of the laminated rubber 23A. When length A1 becomes equal to length A0, the lower flange 21 of the seismic isolation device 2B comes into contact with the stopper 4, and the sliding of the sliding material 32B stops.

[0043] As shown in Figure 2(c), when the horizontal load on the superstructure 16 increases further, the sliding material 32A begins to slide on the sliding plate 31A on the side of the seismic isolation device 2A where the coefficient of friction between the sliding plate 31 and the sliding material 32 is larger. As the sliding material 32A slides, the superstructure 16, which is supported by the seismic isolation device 2A to which the sliding material 32A is fixed, is further displaced horizontally. As the superstructure 16 is displaced horizontally, the laminated rubber 23B deforms. In this second stage, the laminated rubber 23A does not deform any further than it did in the first stage. In the second stage, the laminated rubber 23B bears the horizontal load.

[0044] Length A2 represents the horizontal sliding length of the sliding material 32A, the horizontal displacement length of the superstructure 16, and the horizontal deformation length of the laminated rubber 23B. Combining the first and second stages, length A3 = A1 + A2 is equal to the sum of the horizontal deformable length of the laminated rubber 23A and the horizontal deformable length of the laminated rubber 23B.

[0045] Figure 3 shows the relationship between load and deformation in seismic isolation mechanism 1. The horizontal axis represents load, and the vertical axis represents deformation. The left figure shows the relationship between load and deformation due to seismic isolation device 2A and displacement control device 3A. The center figure shows the relationship between load and deformation due to seismic isolation device 2B and displacement control device 3B. The right figure shows the relationship between load and deformation for the entire seismic isolation mechanism 1. It can be seen that deformation occurs in the first stage, followed by further deformation in the second stage.

[0046] Next, we will explain the analysis results of the seismic isolation mechanism 1 shown above. The area to be analyzed has a planar size of 32m x 28m = 896m 2 , with a mass per unit area of ​​0.6 ton / m² 2 Assuming a standard floor mass of 538 tons and a 10-story building (with the upper floor being twice the size of the standard floor), the building will have a total weight of 6456 tons, and the entire structure will be modeled as a single point mass.

[0047] The rigidity of seismic isolation device 2A is set to 15120 kN / m (period 4.1 seconds), and the viscous damping coefficient is set to 4940 kNsec / m (damping 25%). The sliding load on the sliding surface in series with seismic isolation device 2A (the sliding surface between the sliding plate 31A and the sliding material 32A) is set to 7560 kN (assuming it supports half the weight of the building, the sliding coefficient = 7560 / (0.5 × 6456 × 9.8) = 0.239, and the deformation of seismic isolation device 2A when it slides is set to 0.5 m).

[0048] The rigidity of seismic isolation device 2B is set to twice that of seismic isolation device 2A, resulting in 30240 kN / m. The sliding load on the sliding surface in series with seismic isolation device 2B (the sliding surface between the sliding plate 31B and the sliding material 32B) is 355 kN (assuming it supports half the weight of the building, the sliding coefficient = 355 / (0.5 × 6456 × 9.8) = 0.011). The stroke A0 to the stopper 4, which is parallel to the sliding mechanism, is set to 0.5 m.

[0049] The input ground motion will be OS1 as Level 2 (from acceleration data for the Osaka area shown in the Ministry of Land, Infrastructure, Transport and Tourism's "Measures against Long-Period Ground Motion Caused by Megathrust Earthquakes Along the Nankai Trough in Super High-Rise Buildings, etc." (2016, National Housing and Housing Guidance No. 1111)), and TCU068 as a larger long-period ground motion (from observation records in Shigang during the 1999 Chi-Chi earthquake in Taiwan, which will be used here based on the direction along the main axis).

[0050] Figures 4 and 5 show the load-deformation relationship of the seismic isolation mechanism 1 (seismic isolation device 2A + displacement control device 3A + seismic isolation device 2B + displacement control device 3B), oil dampers, and the entire seismic isolation layer S including the oil dampers for OS1 and TCU068. Figure 4 shows the load-deformation results for the input seismic wave OS1, where (a) shows the case with only the seismic isolation mechanism, (b) shows the case with only the oil dampers, and (c) shows the entire seismic isolation layer including the oil dampers. Figure 5 shows the load-deformation results for the input seismic wave TCU068, where (a) shows the case with only the seismic isolation mechanism, (b) shows the case with only the oil dampers, and (c) shows the entire seismic isolation layer including the oil dampers.

[0051] Furthermore, for comparison, Figures 6 and 7 show the case with only the seismic isolation device 2A and displacement control device 3A (without installing seismic isolation device 2B and displacement control device 3B). When the sliding surface connected in series with the seismic isolation device 2A slides, the increase in reaction force is small and the displacement progresses. In Figures 4 to 7, the units are N and m. Figure 6 shows the load deformation results of the input seismic wave OS1 in the comparative example, (a) shows the case with seismic isolation device 2A and displacement control device 3A, (b) shows the case with an oil damper, and (c) shows the case with seismic isolation device 2A, displacement control device 3A and an oil damper. Figure 7 shows the load deformation results of the input seismic wave TCU068 in the comparative example, (a) shows the case with seismic isolation device 2A and displacement control device 3A, (b) shows the case with an oil damper, and (c) shows the case with seismic isolation device 2A, displacement control device 3A and an oil damper.

[0052] Furthermore, the stress results are summarized in Table 1 below.

[0053] [Table 1]

[0054] For OS1, the only difference between seismic isolation mechanism 1 and the comparative example is the behavior of the displacement control device 3B (low friction sliding mechanism) with a low coefficient of friction, which is connected in series with the seismic isolation device 2B. In both cases, the displacement of the seismic isolation layer is 50 cm or less.

[0055] On the other hand, for TCU068, the reaction force of seismic isolation mechanism 1 increased when the displacement of the seismic isolation layer S exceeded 50 cm, ultimately reaching a maximum of 83 cm. In contrast, the deformation progressed in the comparative example, with a maximum displacement of 161 cm.

[0056] As described above, with the seismic isolation mechanism 1, it is possible to double the movable displacement of the entire seismic isolation layer S by utilizing the conventional seismic isolation device 2, and because the rigidity of the seismic isolation device 2B resists the increase in seismic force, the displacement of the seismic isolation layer S can be suppressed more than when the slip surface is simply enlarged.

[0057] In the seismic isolation mechanism 1 configured in this way, in the first stage when a horizontal load acts on the superstructure 16, the displacement control device 3B with the smaller coefficient of friction is displaced horizontally, and the seismic isolation device 2A with the lower rigidity is displaced. When the seismic isolation device 2B, supported by the displacement control device 3B with the smaller coefficient of friction, comes into contact with the stopper 4, the first stage ends. In the second stage when the horizontal load on the superstructure 16 increases further, the displacement control device 3A with the larger coefficient of friction is displaced horizontally, and the seismic isolation device 2B with the higher rigidity is displaced. In this way, by installing displacement control devices 3 with different coefficients of friction, the timing at which multiple seismic isolation devices 2A and 2B begin to bear the seismic force (horizontal load) can be staggered, so that the displacement of the seismic isolation layer can be suppressed even with large seismic forces.

[0058] Furthermore, the displacement control device 3 is configured to include a sliding plate 31 and a sliding material 32, and the friction coefficient of the displacement control device 3 can be changed by changing the friction coefficient between the sliding plate 31 and the sliding material 32, thus allowing the friction coefficient to be controlled in a simple manner.

[0059] Furthermore, the sliding plate 31 is fixed to the upper surface 11u of the lower structure 11, and the sliding material 32 is fixed to the lower surface 21d of the seismic isolation device 2. Therefore, the sliding plate 31 and the sliding material 32 can be easily installed.

[0060] Furthermore, the stopper 4 is installed so as to be erected upward from the lower structure 11. Therefore, the stopper 4 can be installed as an integral part of the lower structure 11 or fixed to the lower structure 11, resulting in good workability for the stopper 4.

[0061] Furthermore, the stopper 4 is positioned around the entire circumference of the seismic isolation device 2B. Therefore, it is possible to restrict the movement of the seismic isolation device 2B in any direction along the horizontal plane.

[0062] Furthermore, a cushioning material may be provided on the surface 4a of the stopper 4. This can mitigate the impact when the seismic isolation device 2 collides with the stopper 4, and suppress damage to the seismic isolation device 2 and the stopper 4.

[0063] Furthermore, the seismic isolation device 2 is formed by laminating laminated rubber and steel plates. Therefore, it can follow any direction along the horizontal plane, and the laminated rubber, which has a large restoring force, can suppress residual displacement after an earthquake.

[0064] It should be noted that the assembly procedure, or the various shapes and combinations of each component shown in the above-described embodiment, are merely examples and can be modified in various ways based on design requirements, etc., without departing from the spirit of the present invention.

[0065] For example, in the embodiment shown above, the displacement control device 3 is configured to include a sliding plate 31 and a sliding material 32, but the present invention is not limited thereto. The displacement control device 3 with a smaller coefficient of friction may be a linear guide. A linear guide is a well-known configuration and includes a rail (not shown) and a guide that is guided by the rail and supported to be movable in the direction of the rail's extension, wherein either the rail or the guide may be fixed to the lower flange 21 of the seismic isolation device 2, and the other of the rail or guide may be fixed to the substructure 11.

[0066] Furthermore, in the embodiment described above, the seismic isolation device 2 is fixed to the superstructure 16 and the displacement control device 3 is fixed to the lower structure 11, but the present invention is not limited thereto. The seismic isolation device 2 may be fixed to the lower structure 11 and the displacement control device 3 may be fixed to the superstructure 16. In this case, the sliding plate 31 of the displacement control device 3 may be fixed to the lower surface of the superstructure 16, and the sliding material 32 may be fixed to the upper surface of the seismic isolation device 2.

[0067] Furthermore, three or more seismic isolation devices 2 may be installed. In this case, it is sufficient to ensure that the friction coefficients of at least two of the displacement control devices 3 are different.

[0068] The Sustainable Development Goals (SDGs) are 17 international goals adopted at the UN Summit in September 2015. The joint structure 100 according to this embodiment can contribute to achieving some of the 17 SDGs, such as Goal 11, "Make cities and human settlements inclusive, safe, resilient and sustainable." [Explanation of Symbols]

[0069] 1. Seismic isolation mechanism 2,2A,2B Seismic isolation devices 3,3A,3B Displacement control device 4. Stopper (wall section) 11 Substructure 16 Superstructure 31, 31A, 31B Slide 32, 32A, 32B sliding material S seismic isolation layer

Claims

1. A plurality of seismic isolation devices are arranged in a seismic isolation layer formed between a lower structure and an upper structure positioned above the lower structure, fixed to either the lower structure or the upper structure, and supporting the upper structure so that it can move horizontally during an earthquake. The system includes a displacement control device fixed to the surface of the other of the lower structure and the upper structure facing the seismic isolation device, which supports each of the seismic isolation devices so that it can move horizontally during an earthquake, In the displacement control device that supports the plurality of seismic isolation devices, the coefficients of friction are different, A wall portion is installed on the outer periphery side of the seismic isolation device with the smaller coefficient of friction. The displacement control device with the smaller coefficient of friction is a linear guide. The displacement control device with the larger coefficient of friction is A sliding plate fixed to the surface of the other of the lower structure and the upper structure facing the seismic isolation device, A seismic isolation mechanism comprising: a lower structure and a sliding material fixed to the other side of the upper structure of the seismic isolation device, and which is slidable relative to the sliding plate.

2. The sliding plate is fixed to the upper surface of the lower structure, The seismic isolation mechanism according to claim 1, wherein the sliding material is fixed to the lower surface of the seismic isolation device.

3. The seismic isolation mechanism according to claim 1, wherein the wall portion is provided to be erected above the lower structure.

4. The seismic isolation mechanism according to claim 1, wherein the wall portion is arranged around the entire circumference of the outer periphery of the seismic isolation device.

5. The seismic isolation mechanism according to claim 1, wherein a buffer material is provided on the surface of the wall portion facing the seismic isolation device.

6. The seismic isolation device is a seismic isolation mechanism according to claim 1, formed by laminating laminated rubber and steel plates.

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