Seismic isolation systems and displacement control devices

Abstract

To provide a seismic isolation system capable of changing a spring constant according to displacement.SOLUTION: In a seismic isolation system 1, a seismic isolation object 5 and a movable member 9 move in a D1 direction with respect to a support structure 3. The movable member 9 restricts the relative movement of the seismic isolation object 5 from a first relative position to a +D1 side, and allows the relative movement of the seismic isolation object 5 from the first relative position to a -D1 side. A compression element 13 has a connection part 13a connected to the movable member 9, and a connection part 13b connected to the support structure 3. The compression element 13 generates a restoring force that separates the connection part 13a and the connection part 13b, which increases as the connection part 13a and the connection part 13b approach each other in a first force direction of connecting the connection part 13a and the connection part 13b. In a stationary state, the first force direction is inclined with respect to a D2 direction perpendicular to the D1 direction in such a direction that the connection part 13b is located on the +D1 side with respect to the connection part 13a.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a seismic isolation system and a displacement suppression device that can be used in the seismic isolation system, etc. Note that the seismic isolation system is not limited to a system for reducing vibrations caused by earthquake motion. However, for convenience, the commonly used term "seismic isolation system" will be used. [Background technology]

[0002] Seismic isolation systems are known that allow a seismically isolated object to be displaced horizontally relative to a support structure that supports the object (see, for example, Patent Documents 1 and 2). Such seismic isolation systems can reduce the acceleration applied to the object when an earthquake occurs. However, if the relative displacement of the object becomes excessive, problems such as collisions between the object and surrounding structures can occur.

[0003] Patent Documents 1 and 2 propose a mechanism for generating a restoring force in which the spring constant of the restoring force acting on the seismically isolated object becomes substantially smaller as the relative displacement of the seismically isolated object increases. With such a mechanism, when a long-period earthquake motion occurs, the natural period of the seismically isolated object is relatively short when the object is located near its initial position, which prevents the object from resonating and reduces the likelihood of excessive relative displacement. Furthermore, when a short-period earthquake motion occurs, the natural period becomes relatively long when the object moves away from its initial position, which prevents the object from resonating and reduces the likelihood of excessive acceleration.

[0004] Patent Document 1 discloses that the change in spring constant may be achieved by either active control or passive control. It also discloses that a link mechanism may be used in the case of passive control. Patent Document 2 discloses that the change in spring constant is achieved by a mechanism that transmits vibrations of the seismically isolated object to an elastic member, which is configured by combining a link and a slider. Patent Document 3 discloses that an elastic mechanism that utilizes unbalanced force may be used for vertical seismic isolation. The contents of Patent Documents 1 to 3 may be incorporation by reference into this application. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-163799 [Patent Document 2] Japanese Patent Application Publication No. 2020-085079 [Patent Document 3] International Publication No. 2017 / 043230 Summary of the Invention [Problem to be solved by the invention]

[0006] The technologies of Patent Documents 1 to 3 all have various advantages and disadvantages. Therefore, in order to meet the diverse needs related to seismic isolation systems, a new seismic isolation system and displacement suppression device with a new structure that can change the spring constant according to displacement is awaited. [Means for solving the problem]

[0007] A seismic isolation system according to one aspect of the present disclosure includes an isolator that allows relative movement of a first object with respect to a second object toward a first side in a first movement direction and a second side opposite to the first side, and a first movable member that is movable relative to the second object toward a third side in a second movement direction and a fourth side opposite to the third side, wherein when a position in the second movement direction is virtually coordinate-transformed to a position in the first movement direction so that the first side and the third side are the same side and the second side and the fourth side are the same side, the relative movement of the first object with respect to the first movable member from a predetermined first relative position between the first object and the first movable member to the first side is the first compression element has a first movable member that restricts relative movement of the first object from the first relative position to the second side and allows relative movement of the first object with respect to the first movable member, a first connecting portion connected to the first movable member, and a second connecting portion connected to the second object, and in a first force direction connecting the first connecting portion and the second connecting portion, a restoring force that increases as the first connecting portion and the second connecting portion approach each other is generated, and in a stationary state, the first force direction is inclined with respect to a direction perpendicular to the second movement direction such that the second connecting portion is located on the third side relative to the first connecting portion.

[0008] A displacement suppression device according to one aspect of the present disclosure is a displacement suppression device that suppresses relative movement of a first object with respect to a second object toward a first side in a first movement direction and a second side opposite to the first side, the displacement suppression device including a first movable member that is movable relative to the second object toward a third side in a second movement direction and a fourth side opposite to the third side, the displacement suppression device comprising: a first movable member that is movable relative to the second object toward a third side in a second movement direction and a fourth side opposite to the third side, the first movable member being configured to suppress relative movement of the first object with respect to the first movable member from a predetermined first relative position between the first object and the first movable member to the first side when a position in the second movement direction is virtually coordinate-transformed into a position in the first movement direction so that the first side and the third side are the same side and the second side and the fourth side are the same side; and a first compression element that has a first movable member that restricts relative movement of the first object from the first relative position to the second side with respect to the first movable member, a first connecting portion connected to the first movable member, and a second connecting portion connected to the second object, and that generates a restoring force that moves the first connecting portion and the second connecting portion apart in a first force direction connecting the first connecting portion and the second connecting portion, the restoring force increasing as the first connecting portion and the second connecting portion approach each other, and that is inclined in a direction such that, in a stationary state, the second connecting portion is located on the third side relative to the first connecting portion with respect to a direction perpendicular to the second movement direction. [Effects of the Invention]

[0009] According to the above configuration, the spring constant can be changed in accordance with the displacement. [Brief explanation of the drawings]

[0010] [Figure 1] 1(a) and 1(b) are schematic diagrams for explaining an overview of a seismic isolation system according to an embodiment. [Figure 2] 2(a) and 2(b) are other schematic diagrams for explaining the outline of the seismic isolation system according to the embodiment. [Figure 3] FIG. 2 is a diagram showing an example of restoring force characteristics of the seismic isolation system according to the embodiment. [Figure 4] 10A and 10B are diagrams showing examples of restoring force characteristics of seismic isolation systems according to the embodiment and a comparative example. [Figure 5] 1 is a schematic diagram showing a typical example of a seismic isolation system according to an embodiment. [Figure 6] FIG. 1 is a perspective view showing a specific example of a seismic isolation system according to an embodiment. [Figure 7] FIG. 7 is a schematic diagram showing the main parts of the seismic isolation system shown in FIG. 6. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. The drawings used in the following description are schematic. Therefore, for example, the dimensional ratios in the drawings do not necessarily correspond to the actual ones. The dimensional ratios may not match between drawings. Certain shapes and / or dimensions may be exaggerated, and details may be omitted. However, the above does not deny that the actual shapes and / or dimensions may be as shown in the drawings, or that features of shapes and / or dimensions may be extracted from the drawings.

[0012] As will be described later, elements that generate a restoring force (sometimes referred to as "restoring elements") are not limited to springs. However, for convenience, the rate of change of the restoring force with respect to displacement (corresponding to the extension or contraction of a spring) is referred to as the "spring constant." Furthermore, among restoring elements, elements that generate a restoring force that resists extension are sometimes referred to as "tension elements," and elements that generate a restoring force that resists contraction are sometimes referred to as "compression elements." "Orthogonal" or "vertical" includes torsional positions unless there is a contradiction. Unless otherwise specified, "rest" refers to, for example, a state in which no vibration (or, from another perspective, external force) is input to the seismic isolation system (for example, a state in which no earthquake is occurring).

[0013] In the description of multiple aspects of the seismic isolation system, for the aspects described later, basically only the differences from the aspects described earlier will be described. Matters not specifically mentioned may be considered to be the same as the aspects described earlier or may be inferred from the aspects described earlier. Furthermore, for convenience, corresponding components in multiple aspects may be given the same reference numerals even if there are differences. Conversely, for convenience of explanation, the same components may be given different reference numerals.

[0014] The following description will be made in the following order: Sections 1 to 3 will explain the main points of the seismic isolation system according to the embodiment. Next, Sections 4 to 6 will explain the seismic isolation system according to the embodiment in more detail. After that, Section 7 will summarize the embodiment. 1. Overview of the structure and operation of the seismic isolation system (Fig. 1(a) to Fig. 2(b)) 2. Restoring force characteristics of the seismic isolation system (Figs. 3 and 4) 3. Actions and Effects of Seismic Isolation Systems 4. Details of the seismic isolation system configuration 5. Typical example of seismic isolation system configuration (Fig. 5) 6. Specific examples of seismic isolation system configurations (Figs. 6 and 7) 7. Summary of embodiments

[0015] (1. Overview of the structure and operation of the seismic isolation system) Here, the configuration and operation of the seismic isolation system according to the embodiment will be briefly outlined, and accuracy may be ignored to facilitate understanding.

[0016] 1(a), 1(b), 2(a), and 2(b) are schematic diagrams for explaining an overview of a seismic isolation system 1 according to an embodiment. These figures show different states of the same seismic isolation system 1. Cartesian coordinate systems D1D2D3 are attached to these figures.

[0017] The illustrated seismic isolation system 1 has an isolator 7 (seismic isolation bearing) that supports a seismic isolation object 5 so that it can move in the D1 direction relative to a support structure 3. Here, rails 7a included in the isolator 7 are represented by straight lines. The rails 7a guide the seismic isolation object 5 in the D1 direction relative to the support structure 3. From another perspective, the rails 7a restrict movement of the seismic isolation object 5 relative to the support structure 3 in at least the D2 direction among directions other than the D1 direction.

[0018] The seismic isolation system 1 also has a movable member 9, a tension element 11, and a compression element 13 as components for applying a restoring force to the seismic isolation object 5. The configuration including the movable member 9, the tension element 11, and the compression element 13 may be referred to as a displacement suppression device 15.

[0019] The movable member 9 is movable in the D1 direction relative to the support structure 3, and is located on the +D1 side relative to the seismic isolation object 5. In the example shown, the movable member 9 is guided in the D1 direction by the rail 7a. From another perspective, the rail 7a restricts movement of the movable member 9 relative to the support structure 3 in at least the D2 direction among directions other than the D1 direction.

[0020] The tension element 11, simply put, corresponds to a tension spring. That is, the tension element 11 generates a restoring force that resists extension. The tension element 11 is connected to the movable member 9 and the support structure 3. As shown in FIG. 1(a), the tension element 11 is arranged so as to be perpendicular to the direction D1 when the seismic isolation object 5 is stationary. Also, at this time, the tension element 11 is not, for example, extended (does not generate a restoring force).

[0021] Simply put, the compression element 13 corresponds to a compression spring. That is, the compression element 13 generates a restoring force that resists compression. The compression element 13 is connected to the movable member 9 and the support structure 3. As shown in FIG. 1(a), when the seismic isolation object 5 is stationary, the compression element 13 is inclined in a direction perpendicular to the D1 direction (D2 direction) so that the support structure 3 side is on the +D1 side. Also, at this time, the compression element 13 is not compressed (does not generate a restoring force), for example.

[0022] As already mentioned, Figure 1(a) shows a state in which no earthquake has occurred and the seismic isolation object 5 is stationary. The position of the seismic isolation object 5 at this time is taken as the initial position P0. In other figures, the initial position P0 is indicated by a two-dot chain line.

[0023] As shown in Figure 1(b), when the seismic isolation object 5 moves from the initial position P0 to the +D1 side, the movable member 9 is also pushed by the seismic isolation object 5 and moves to the +D1 side. At this time, the tension element 11 expands and generates a restoring force. Also, the compression element 13 contracts and generates a restoring force. Both of these restoring forces are transmitted to the seismic isolation object 5 via the movable member 9 and act as restoring forces that return the seismic isolation object 5 to the initial position P0.

[0024] As shown in FIG. 2(a), if the seismic isolation object 5 moves further toward the +D1 side, the compression element 13 tilts in the opposite direction from before with respect to the D2 direction. As a result, the restoring force of the compression element 13 acts on the movable member 9 as a force that tends to move the movable member 9 toward the +D1 side. As a result, the restoring force that returns the seismic isolation object 5 to the initial position P0 is reduced. Note that if the displacement of the seismic isolation object 5 toward the +D1 side is small, it may return from the state of FIG. 1(b) to the state of FIG. 1(a) without reaching the state of FIG. 2(a) from the state of FIG. 1(b).

[0025] As shown in FIG. 2(b), when the seismic isolation object 5 moves from the initial position P0 to the -D1 side, the seismic isolation object 5 moves, leaving the movable member 9 behind. Therefore, unlike when the seismic isolation object 5 moves from the initial position P0 to the +D1 side, the tension element 11 and the compression element 13 do not apply a restoring force to the seismic isolation object 5. Note that in FIG. 2(b), for ease of illustration, the movable member 9 is shown in a position when it is stationary. As will be described later, in reality, this is not necessarily the case.

[0026] (2. Characteristics of seismic isolation systems) 3 is a diagram showing an example of the restoring force characteristics of the seismic isolation system 1. In this diagram, the horizontal axis represents the displacement (m) of the seismic isolation object 5 from the initial position P0 to the +D1 side, and the vertical axis represents the restoring force (kN) acting on the seismic isolation object 5.

[0027] The line Ln1 indicates the restoring force generated by the tension element 11. The line Ln2 indicates the restoring force generated by the compression element 13. The line Ln3 indicates the sum of the restoring forces generated by the tension element 11 and the compression element 13.

[0028] The restoring force shown in the figure is the restoring force acting on the seismic isolation object 5 toward the -D1 side. Therefore, for example, line Ln1 does not indicate the restoring force generated in the extension direction of the tension element 11, but rather indicates the component (component force) in the D1 direction of the restoring force generated in the extension direction. The same applies to lines Ln2 and Ln3.

[0029] The tension element 11 generates a restoring force F1 (FIG. 1(b)) roughly proportional to the elongation in the extension direction of the tension element 11, similar to a general tension spring. In other words, the spring constant is roughly constant. Therefore, for example, if a line representing the restoring force F1 in the extension direction were drawn in FIG. 3, the line would be a straight line extending at a slope such that the restoring force increases as the displacement increases.

[0030] Here, the inclination angle of the tension element 11 with respect to the D2 direction is θ1 (Figure 1(b)). At this time, of the above-mentioned restoring force F1, the restoring force F1a (component force) acting on the seismic isolation object 5 in the D1 direction is F1 × sin θ1. The inclination angle θ1 is 0° when the seismic isolation object 5 is at the initial position P0, and becomes larger as the seismic isolation object 5 is displaced toward the +D1 side. Furthermore, the more the seismic isolation object 5 is displaced toward the +D1 side, the greater the increase in elongation of the tension element 11 with respect to the increase in displacement.

[0031] Therefore, for example, the rate of change of the restoring force F1a increases as the displacement increases, as shown by line Ln1 in Fig. 3. In other words, the spring constant for the restoring force in the D1 direction increases as the displacement increases.

[0032] Like a typical compression spring, the compression element 13 generates a restoring force F2 (FIG. 1(b)) roughly proportional to the compression in the contraction direction of the compression element 13. In other words, the spring constant is roughly constant. Therefore, for example, if a line representing the restoring force F2 in the extension direction were drawn in FIG. 3, the line would be a straight line extending at a slope such that the restoring force increases as the displacement increases (excluding the state in FIG. 2(a)).

[0033] Here, the inclination angle of the compression element 13 with respect to the D2 direction is θ2 (Figure 1(b)). At this time, of the above-mentioned restoring force F2, the restoring force F2a (component force) acting on the seismic isolation object 5 in the D1 direction is F2 × sin θ2. The inclination angle θ2 has a predetermined magnitude that is not 0° when the seismic isolation object 5 is at the initial position P0, and becomes smaller as the seismic isolation object 5 is displaced toward the +D1 side. Also, at this time, the more the seismic isolation object 5 is displaced toward the +D1 side, the smaller the increase in contraction (absolute value) of the compression element 13 with respect to the increase in displacement. Furthermore, when the seismic isolation object 5 is displaced toward the +D1 side (Figure 2(a)), the inclination angle θ2 becomes a negative value.

[0034] Therefore, as shown by line Ln2 in Figure 3, when the seismic isolation object 5 is displaced toward the +D1 side, for example, the compression element 13 contracts, and the restoring force F2a increases initially. However, as the displacement increases, sin θ2 decreases, and the rate of change (spring constant) of the restoring force F2a gradually decreases, and the rate of change eventually becomes negative (the restoring force F2a begins to decrease). As the displacement increases further, the tilt angle θ2 becomes negative, and the restoring force F2a also becomes negative.

[0035] When the restoring force characteristics of the tension element 11 and the compression element 13 are combined as described above, as shown by line Ln3 in Figure 3, when the displacement of the seismic isolation object 5 toward the +D1 side is relatively small, the restoring force increases (the spring constant takes a relatively large positive value). When the displacement becomes larger still, the restoring force plateaus (the spring constant takes a relatively small absolute value). When the displacement becomes larger still, the restoring force increases again (the spring constant takes a relatively large positive value).

[0036] FIG. 4 is a diagram showing an example of the restoring force characteristics of the seismic isolation system 1 in comparison with the restoring force characteristics of a comparative example.

[0037] In this figure, the horizontal and vertical axes are the same as those in Figure 3. Line Ln5 shows the restoring force characteristics of the seismic isolation system 1, and corresponds to line Ln3 in Figure 3. However, the specific design conditions differ between the system associated with line Ln5 and the system associated with line Ln3. Line Ln6 shows the restoring force characteristics of a seismic isolation system according to a comparative example. The seismic isolation system according to the comparative example has a configuration that is the same as or similar to the configuration disclosed in Patent Document 2, for example.

[0038] As can be seen from a comparison between line Ln5 and line Ln6, the seismic isolation system 1 can exhibit characteristics similar to the restoring force characteristics of the seismic isolation system according to the comparative example when the displacement is equal to or smaller than a certain magnitude including the initial position P0. In other words, when the displacement is relatively small, the restoring force increases, and when the displacement becomes large to a certain extent, the restoring force reaches a plateau.

[0039] However, once the displacement exceeds a certain level, the seismic isolation system 1 can exhibit characteristics different from the restoring force characteristics of the seismic isolation system according to the comparative example. Specifically, the seismic isolation system 1 can exhibit a characteristic in which the restoring force increases relatively rapidly. This is due, for example, to an increase in the rate of change of the restoring force of the tension element 11.

[0040] (3. Actions and Effects of Seismic Isolation Systems) The restoring force characteristics of the seismic isolation system 1 described above may be utilized in the operation of the seismic isolation system 1, for example, as follows.

[0041] The natural period of the seismic isolation object 5 becomes shorter as the spring constant of the restoring force acting on the seismic isolation object 5 becomes larger. On the other hand, as explained with reference to Figures 3 and 4, the spring constant of the seismic isolation system 1 changes depending on the displacement of the seismic isolation object 5, and therefore the natural period of the seismic isolation object 5 changes depending on the displacement.

[0042] Specifically, when the displacement is relatively small and the restoring force (F1a + F2a) shown by line Ln3 or Ln5 increases in accordance with the displacement, the natural period is relatively short. When the displacement increases and the increase in the restoring force reaches a plateau, the natural period becomes longer. When the displacement increases further and the restoring force again increases in accordance with the displacement, the natural period becomes shorter.

[0043] Here, for example, the natural period at the initial position P0 of the seismic isolation object 5 may be set to be shorter than the period of the seismic motion, which has a relatively long period. Specifically, for example, the natural period at the initial position P0 may be set to about 2 seconds (for example, 1.5 seconds or more and 2.5 seconds or less). Note that the natural period of a typical seismic isolation system is set to about 4 seconds.

[0044] Setting the natural period in this manner reduces the risk that the vibration of the seismic isolation object 5 relative to the support structure 3 will resonate with seismic motion, for example, when a relatively long-period earthquake occurs. As a result, for example, the displacement of the seismic isolation object 5 relative to the support structure 3 is suppressed. Suppression of the displacement of the seismic isolation object 5 relative to the support structure 3 means that the seismic isolation function is reduced, and the acceleration in the absolute coordinate system of the seismic isolation object 5 increases. However, the acceleration of long-period seismic motion is generally smaller than the acceleration of short-period seismic motion, and the acceleration is rarely a problem.

[0045] On the other hand, when a relatively short-period earthquake motion occurs, the natural period of the seismic isolated object 5 near the initial position P0 is close to the period of the earthquake motion, and therefore the acceleration of the seismic isolated object 5 increases. However, when the displacement of the seismic isolated object 5 relative to the support structure 3 increases, the natural period becomes shorter (the increase in the restoring force reaches a plateau), causing the natural period to diverge from the period of the earthquake motion, reducing the risk of excessive acceleration occurring.

[0046] If the displacement of the seismic isolated object 5 relative to the support structure 3 becomes even larger, the natural period will become shorter again (the restoring force will increase again). This reduces the likelihood that the displacement of the seismic isolated object 5 relative to the support structure 3 will become excessive, and reduces the likelihood that the seismic isolated object 5 will collide with the support structure 3 or surrounding structural parts.

[0047] The displacement at which the restoring force reaches a plateau may be set to an appropriate size. For example, the displacement may be set to 0.15 m or more and 0.35 m or less. The natural period of the displacement may be set to, for example, about 3 seconds (e.g., 2.5 seconds or more and 3.5 seconds or less) or greater. Similarly, the displacement at which the restoring force increases again may be set to an appropriate size. For example, the displacement may be set to 0.20 m or more and 0.40 m or less (however, greater than the displacement at which the restoring force reaches a plateau).

[0048] As described in the explanation of Figure 3, the restoring force of the seismic isolation system 1 is the sum of the restoring forces of the tension elements 11 and the compression elements 13. Furthermore, the restoring force of each element is the value obtained by multiplying the restoring force in the expansion / contraction direction by sin θ1 or sin θ2. Therefore, a formula for calculating the restoring force of the seismic isolation system 1 from the displacement of the seismic isolation object 5 can be derived based on the spring constants and lengths of the tension elements 11 and compression elements 13 in their unexpanded states, as well as the inclination angles θ1 and θ2 when the seismic isolation object 5 is located at the initial position P0. The setting of the natural period and the displacement at which the natural period changes can be explored, for example, by substituting various values ​​into such a formula.

[0049] As can be seen from Figure 2(b), when the seismic isolation object 5 is displaced from the initial position P0 toward the -D1 side, the restoring forces of the tension elements 11 and compression elements 13 basically do not act on the seismic isolation object 5. The effects of this include, for example, the following.

[0050] Unlike the illustrated example, assume that the compression element 13 is connected to the seismic isolation object 5 rather than to the movable member 9. Assume also that the compression element 13 generates a restoring force that resists tension in response to displacement of the seismic isolation object 5 toward the -D1 side. Here, the spring constant of the compression element 13 in its contraction direction and the inclination angle θ2 when the seismic isolation object 5 is in the initial position P0 are set in consideration of the restoring force characteristics for displacement toward the +D1 side from the initial position P0. The spring constant and inclination angle θ2 set in this manner are not necessarily optimal for displacement toward the -D1 side from the initial position P0. In other words, using the movable member 9 facilitates the setting of various parameters of the compression element 13.

[0051] Furthermore, for example, the compression element 13 may not generate a restoring force when the movable member 9 moves toward the -D1 side from the rest position. Therefore, a configuration of the compression element 13 that does not extend more than when the movable member 9 is in the rest position can be selected. In other words, the degree of freedom in designing the compression element 13 is improved. An example of such a configuration of the compression element 13, although not specifically shown, is one that has a telescopic structure and a coil spring (tension spring or compression spring) that generates a restoring force against the contraction of the telescopic structure (see the spring shaft disclosed in Patent Document 3, for example). The compression element 13 configured in this way may be arranged, for example, so that the telescopic structure is maximally extended when the movable member 9 is in the rest position.

[0052] (4. Details of the seismic isolation system configuration) The seismic isolation system 1 will be described below in brief in the following order. 4.1. Support structure 3, seismic isolation object 5 and isolator 7 4.2. Displacement control device 15 4.2.1. Movable Parts 9 4.2.2. Tension elements 11 Compression Factor 13 4.3. Other Components of Seismic Isolation System 1

[0053] (4.1. Supporting structures, seismic isolation objects and isolators) The specific combination of the seismic isolation object 5 and the support structure 3 shown in FIGS. 1(a) to 2(b) is arbitrary. For example, the combination of the seismic isolation object 5 and the support structure 3 may be a combination of a building (such as a house) and a foundation supporting the building, or a combination of fixtures and a building supporting the fixtures. In particular, examples of objects supported by a building that are preferably seismically isolated include artworks and computer equipment (servers). Furthermore, a seismic isolation object 5 located on the upper floors or rooftop of a building is likely to vibrate with large accelerations and / or displacements due to resonance of the building, and therefore is preferably seismically isolated and the displacement is preferably suppressed. As can be seen from the above examples, the size of the object to which the seismic isolation system according to the embodiment is applied may be arbitrary.

[0054] As will be understood from the explanation of a specific example (FIG. 6) described later, the object referred to as the seismic isolation object 5 in the explanation here may be a member fixed to the seismic isolation object 5, or a member supporting the seismic isolation object 5 so as to be movable relative to the seismic isolation object 5 in a direction intersecting the D1 direction (direction D2 or D3). Furthermore, the object referred to as the support structure 3 may be a member fixed to the support structure 3, or a member supported so as to be movable relative to the support structure 3 in a direction intersecting the D1 direction (direction D2 or D3). However, for convenience, in the explanation of FIGS. 1 to 5, the terms seismic isolation object 5 and support structure 3 are basically used as shown. Furthermore, unless a contradiction arises, the terms seismic isolation object 5 and support structure 3 may be replaced with the terms for the above-mentioned member or simply the term "object."

[0055] In FIG. 1 , the entire seismic isolation object 5 is located on the −D1 side with respect to the movable member 9. The size of the seismic isolation object 5 in the D2 direction is also depicted as being approximately the same as the size of the movable member 9 in the D2 direction. However, the shape and size of the seismic isolation object 5 in relation to the movable member 9 are arbitrary and are not limited to the form shown in the figure. For example, the seismic isolation object 5 may have a portion located on the +D2 side, −D2 side, +D3 side, and / or −D3 side of the movable member 9, and the size of this portion is also arbitrary. Furthermore, for example, the seismic isolation object 5 may have a portion located on the +D1 side with respect to the movable member 9. This portion on the +D1 side may be smaller, equal to, or larger than the portion located on the −D1 side with respect to the movable member 9.

[0056] Although the above description has been given using the seismic isolation object 5 as an example, the shape and size of the support structure 3 in relation to the movable member 9 (or the seismic isolation object 5) are also arbitrary. For example, the support structure 3 may have a portion located in any direction (+D2 side, +D3 side, -D3 side, +D1 side and / or -D1 side) in addition to a portion located on the -D2 side with respect to the seismic isolation object 5 and the movable member 9 (the portion shown in the figure). The size of the support structure 3 is also arbitrary. Furthermore, for example, although the term support structure 3 is used in the description herein as mentioned above, the actual member to which the tension element 11 and compression element 13 are connected may be a relatively small member that differs from the image of the term support structure 3, and may not have a "support" function.

[0057] In the seismic isolation system 1, the direction of movement of the seismic isolation object 5 relative to the support structure 3 may be either horizontal or vertical, or may be both. Furthermore, when the movement direction is horizontal, the seismic isolation system 1 may allow movement of the seismic isolation object 5 in one horizontal direction, or may allow movement of the seismic isolation object 5 in any horizontal direction. Note that this does not mean a general seismic isolation object 5 and support structure 3, but rather means two objects (first object and second object) whose displacement is suppressed by the configurations shown in Figures 1(a) to 2(b), and movement of both objects is restricted in, for example, only one direction (direction D1).

[0058] From another perspective, the relationship between the Cartesian coordinate system D1D2D3 shown in Figures 1(a) to 2(b) and the vertical direction is arbitrary. For example, the D1 direction may be the horizontal direction, and in this case, the D2 direction may be the vertical direction, or the D3 direction may be the vertical direction. Also, for example, the D1 direction may be the vertical direction (direction of gravity).

[0059] The isolator 7 may have, for example, the same configuration as known in the art. Examples of known isolators include laminated rubber bearings, rolling bearings, and sliding bearings. In FIGS. 1(a) to 2(b), the isolator 7 has a rail 7a represented by a straight line. However, the isolator 7 does not have to have a rail 7a. For example, in an embodiment in which the D2 direction (or the D3 direction) is vertical, the displacement of the seismic isolation object 5 toward the +D2 side and the -D2 side may be restricted by gravity and a reaction force. Furthermore, in an embodiment in which the D2 direction (or the D3 direction) is horizontal, a portion of the seismic isolation object 5 may be guided by rollers arranged in the D1 direction, thereby restricting displacement in the D2 direction.

[0060] (4.2. Displacement control device) The displacement suppression device 15 (movable member 9, tension element 11 and compression element 13) may be retrofitted to a conventional seismic isolation system and / or an existing seismic isolation system, or may be incorporated from the beginning into a newly designed seismic isolation system.

[0061] When the displacement suppression device 15 is retrofitted, the restoring force of the seismic isolation system 1 may be obtained, for example, by adding the restoring force included in the conventional and / or existing seismic isolation system and the restoring force of the displacement suppression device 15. Note that after the displacement suppression device 15 is added to the conventional and / or existing seismic isolation system, rather than at the distribution stage of the displacement suppression device 15, the displacement suppression device may be defined to include the restoring elements included in the conventional and / or existing seismic isolation system.

[0062] When a new seismic isolation system is designed with the inclusion of the displacement suppression device 15 in mind, the displacement suppression device 15 may bear all or part of the restoring force of the seismic isolation system 1 (a restoring element separate from the displacement suppression device 15 may be provided). However, the displacement suppression device 15 may be defined to include a restoring element separate from the tension element 11 and the compression element 13, and the above explanation can be understood as merely a matter of defining the displacement suppression device 15.

[0063] The connection relationship of the displacement suppression device 15 to the seismic isolation object 5 and the support structure 3 may be reversed from that in the illustrated example. That is, the movable member 9 may abut against the support structure 3 from one side in the D1 direction, rather than against the seismic isolation object 5, and the tension element 11 and compression element 13 may be connected to the seismic isolation object 5, rather than to the support structure 3. However, for convenience, the explanation of the embodiments will be mainly based on the illustrated example.

[0064] (4.2.1. Movable parts) As can be understood from the above explanation, the movable member 9, like the seismic isolation object 5, is capable of relative movement to both the -D1 side and the +D1 side with respect to the support structure 3. Furthermore, when the movable member 9 and the seismic isolation object 5 come into contact with each other, the relative movement of the movable member 9 to the -D1 side with respect to the seismic isolation object 5 is restricted. Consequently, when a restoring force toward the -D1 side is applied to the movable member 9 by the tension element 11 and the compression element 13, this restoring force is transmitted to the seismic isolation object 5.

[0065] The action of the movable member 9 coming into contact with the seismic isolation object 5 can be broadly conceptualized as follows: A predetermined relative position in the D1 direction between the movable member 9 and the seismic isolation object 5 is referred to as the "first relative position." In the illustrated example, the position where the movable member 9 comes into contact with the seismic isolation object 5 is the first relative position. The movable member 9 is restricted from moving relative to the seismic isolation object 5 from the first relative position to one side in the D1 direction (the -D1 side in the illustrated example). The movable member 9 is also permitted to move relative to the seismic isolation object 5 from the first relative position to the other side in the D1 direction (the +D1 side in the illustrated example).

[0066] Various configurations are possible for realizing the above-described generic action, other than the configuration in which the movable member 9 abuts against the seismic isolation object 5 from the +D1 side. For example, the movable member 9 may be located away from the seismic isolation object 5 on the -D1 side and connected to the seismic isolation object 5 by a flexible member (e.g., a chain or wire). When the seismic isolation object 5 is in the initial position P0, the flexible member may be, for example, in a state with almost no slack. In such a configuration, when the seismic isolation object 5 moves from the initial position P0 to the +D1 side, the movable member 9 is pulled to the +D1 side via the flexible member. When a restoring force toward the -D1 side is applied to the movable member 9 by the tension element 11 and the compression element 13, this restoring force is transmitted to the seismic isolation object 5 via the flexible member. On the other hand, when the seismic isolation object 5 moves to the -D1 side and slack occurs in the flexible member, no restoring force toward the +D1 side is applied to the seismic isolation object 5. The relative position between the movable member 9 and the seismic isolation object 5 when there is no slack in the flexible member corresponds to the first relative position described above.

[0067] When a flexible member is used as described above, a pulley or pin may be provided that abuts against the flexible member when it is not slack, changing the direction in which the flexible member extends. This makes it possible to differentiate the direction in which the seismic isolation object 5 moves relative to the support structure 3 from the direction in which the movable member 9 moves relative to the support structure 3. For example, a flexible member that connects the seismic isolation object 5, which is movable in the D1 direction, and the movable member 9, which is movable in the D2 direction, may extend from the seismic isolation object 5 along the D1 direction, and then bend by the pulley to extend toward the movable member 9 along the D2 direction.

[0068] Taking the above aspects into consideration, the action of the movable member 9 abutting against the seismic isolation object 5 can be further conceptualized as follows. The direction of movement of the seismic isolation object 5 relative to the support structure 3 is referred to as the "first movement direction," and both sides thereof are referred to as the "first side" and the "second side." The direction of movement of the movable member 9 relative to the support structure 3 is referred to as the "second movement direction," and both sides thereof are referred to as the "third side" and the "fourth side." Consider a virtual coordinate transformation from the position in the second movement direction to the position in the first movement direction so that the first side and the third side become the same side, and the second side and the fourth side become the same side. At this time, the movable member 9 restricts the relative movement of the seismic isolation object 5 with respect to the movable member 9 from the already-described first relative position between the seismic isolation object 5 and the movable member 9 toward the first side, and allows the relative movement of the seismic isolation object 5 with respect to the movable member 9 from the first relative position toward the second side.

[0069] For convenience, the description of the embodiments will be limited to the illustrated aspects of the above-described generic concepts.

[0070] The movable member 9 is movable in the direction D1 relative to the support structure 3 (as described above, other directions are also possible). In other words, movement in directions other than the D1 direction is restricted. Regarding the allowance and restriction of such movement and the configuration for carrying out such allowance and restriction, the explanations regarding the allowance and restriction of movement of the seismic isolation object 5 relative to the support structure 3 and the isolator 7 may be cited.

[0071] In the illustrated example, as described above, the movable member 9 is guided in the D1 direction by the rail 7a that guides the seismic isolation object 5 in the D1 direction. In other words, the movable member 9 and the seismic isolation object 5 share at least a portion of the isolator 7. However, unlike the illustrated example, the isolator 7 does not have to be shared. For example, the movable member 9 may be guided by another rail that runs parallel to the rail 7a. Furthermore, as described above, the moving direction of the movable member 9 may be different from the moving direction of the seismic isolation object 5, and in this case, it is clear that a portion of the isolator does not have to be shared.

[0072] In the example shown in FIG. 1(a), in a stationary state, the movable member 9 abuts against the seismic isolation object 5. In other words, using the above-mentioned generic expression, in a stationary state, the seismic isolation object 5 and the movable member 9 are in a first relative position. However, in a stationary state, the movable member 9 may be separated from the seismic isolation object 5 toward the +D1 side. In this case, the restoring forces of the tension element 11 and the compression element 13 do not act until the seismic isolation object 5 moves toward the +D1 side and abuts against the movable member 9. Then, after the seismic isolation object 5 abuts against the movable member 9, the above-mentioned restoring force characteristics are exerted.

[0073] The movable member 9 may or may not be movable relative to the support structure 3 from a position in a stationary state ( FIG. 1( a)) toward the −D1 side. In the latter case, for example, a stopper (not shown) may be provided that is fixed to the support structure 3 and abuts against the movable member 9 from the −D1 side to the +D1 side when the movable member 9 is in the position of FIG. 1( a). Note that such a stopper may be provided so as to abut not when the movable member 9 is in the position of FIG. 1( a) but when the movable member 9 is in a position away from the position of FIG. 1( a) on the −D1 side by a predetermined distance (for example, a distance shorter than the movable distance from the position of FIG. 1( a) toward the +D1 side). Note that the drive limit of the movable member 9 on the +D1 side may or may not be determined by a stopper (not shown).

[0074] The specific shape, size, and material of the movable member 9 are arbitrary. For example, contrary to the above-mentioned description of the shape and size of the seismic isolation object 5, the movable member 9 may have not only a portion located on the +D1 side with respect to the seismic isolation object 5, but also portions located on the -D1 side, +D2 side, -D2 side, +D3 side, and / or -D3 side. Similarly, contrary to the above-mentioned description of the shape and size of the support structure 3, the movable member 9 may not only have a portion located on the +D2 side with respect to the support structure 3, but also portions located on the -D2 side, +D1 side, -D1 side, +D3 side, and / or -D3 side. Furthermore, for example, the movable member 9 may have a portion that contacts the seismic isolation object 5 in addition to a portion that abuts to transmit a restoring force to the seismic isolation object 5. More specifically, for example, the movable member 9 may have a portion that contacts and slides against the seismic isolation object 5 from the +D2 side, -D2 side, +D3 side, and / or -D3 side.

[0075] The movable member 9 may have a cushioning member (e.g., an elastic member) (not shown) at a portion that abuts against the seismic isolation object 5 from the +D1 side. This may mitigate the impact when the movable member 9 and the seismic isolation object 5 collide. Examples of the elastic member include rubber and a spring. When the restoring force characteristics of the elastic member have a large effect on the restoring force characteristics described with reference to FIGS. 3 and 4, the elastic member may be considered as a component separate from the movable member 9. Note that the cushioning member may be provided in the seismic isolation object 5 instead of or in addition to the movable member 9, or may be guided by the rails 7a independently of the seismic isolation object 5 and the movable member 9.

[0076] As can be understood from the above, the movable member 9 does not have to be in direct contact with the seismic isolation object 5. When expressing that the movable member 9 and the seismic isolation object 5 may be in direct contact with each other, or that another member may be interposed between the movable member 9 and the seismic isolation object 5, an expression such as the movable member 9 "comes into contact with" the seismic isolation object 5 from the +D1 side to the -D1 side may be used.

[0077] (4.2.2. Tension element) The configuration of the tension element 11 may be similar to various known configurations. For example, the tension element 11 may be configured to include a helical spring, a leaf spring, an air spring, or rubber. That is, the tension element 11 may be configured to include an appropriate elastic body, and the elastic force generated by deformation may be used as a restoring force. The tension element 11 generates a restoring force that resists elongation, and typically, the elastic body is a tension spring that generates a restoring force that resists elongation. However, the elastic body included in the tension element 11 may also generate a restoring force that resists compression (a compression spring). For example, the tension element 11 may have a telescopic structure and a compression spring interposed between portions of the telescopic structure that are close to each other in response to elongation (see FIG. 10 of Patent Document 3).

[0078] As indicated by the reference numerals in FIG. 1(a), the tension element 11 is connected to the movable member 9 at a point of application 11a and connected to the support structure 3 at a point of application 11b. For convenience, the reference numerals for the points of application 11a and 11b may be used to refer to the connection parts 11a and 11b. For example, the tension element 11 may be expressed as having the connection part 11a connected to the movable member 9 and the connection part 11b connected to the support structure 3.

[0079] As can be understood from the above description, the connecting portion 11a allows the tension element 11 to rotate about an axis parallel to the D3 direction relative to the movable member 9. Similarly, the connecting portion 11b allows the tension element 11 to rotate about an axis parallel to the D3 direction relative to the support structure 3. The connecting portions 11a and 11b may have various configurations, and may be, for example, known configurations.

[0080] The tension element 11 generates a restoring force that resists elongation and has a positive spring constant. In other words, the tension element 11 generates a restoring force that moves the action points 11a and 11b closer to each other in the direction connecting the two, and this restoring force increases as the action points 11a and 11b move away from each other in the direction connecting the two.

[0081] The points of application 11a and 11b do not have to be the connection points of the tension element 11 to the movable member 9 and the support structure 3. For example, as follows.

[0082] The tension element 11 is composed of a helical spring (elastic body) whose length is shorter than the distance between the application points 11a and 11b, and a wire connected in series to the helical spring. The end of the helical spring opposite the wire is connected to the movable member 9 at the application point 11a. Meanwhile, the wire extends from the helical spring via a pulley or pin provided at the application point 11b to a position other than the application point 11b, and is connected to the support structure 3 at that position. In addition to the above, for example, instead of or in addition to the position between the application points 11a and 11b (pulley or pin), a helical spring may be disposed between the application point 11b and a connecting portion on the support structure 3 side. The above example illustrates an embodiment in which the application point 11b on the support structure 3 side is not a connecting portion. Similarly, the application point 11a on the movable member 9 side does not necessarily have to be a connecting portion. However, in this case, the previously described relationship F2a = F2 × sin θ2 does not necessarily hold.

[0083] In the description of the embodiment, for convenience, unless otherwise specified, the description may be made on the premise that the action points 11a and 11b are the connecting positions.

[0084] As described above, the tension element 11 (in other words, the direction from the application point 11a to the application point 11b) is aligned with (substantially parallel to) the D2 direction in the stationary state (FIG. 1(a)). Even when the tension element 11 is parallel to the D2 direction in the stationary state (in other words, the inclination angle θ1 is 0°), a tolerance may of course exist. Furthermore, the tension element 11 may be inclined with respect to the D2 direction in the stationary state. In this case, the inclination angle θ1 in the stationary state may be smaller than the inclination angle θ2 of the compression element 13 in the stationary state, for example.

[0085] As described above, the tension element 11 is not elongated (does not generate a restoring force) in a stationary state. However, the tension element 11 may generate a restoring force in a stationary state. In this case, the tension element 11 may be parallel to the D2 direction or inclined in the D2 direction. In the former case (parallel), for example, the restoring force of the compression element 13 may not be generated, and the inclination angle θ1 may be 0° due to the restoring force of the tension element 11. In the latter case (inclined), the component of the restoring force of the tension element 11 parallel to the D1 direction may be balanced with the component of the restoring force of the compression element 13 in the D1 direction (when the application point 11a is inclined so as to be located on the -D1 side relative to the application point 11b), or may be balanced with a reaction force from a stopper (not shown) that restricts movement of the movable member 9 to the -D1 side (when the application point 11a is inclined so as to be located on the +D1 side relative to the application point 11b).

[0086] Unlike the illustrated example, the tension element 11 may be connected to the seismically isolated object 5 instead of the movable member 9. Alternatively, instead of or in addition to the tension element 11 connected to the movable member 9, another tension element may be provided that is connected to the seismically isolated object 5 and the support structure 3 in the same orientation as the tension element 11. The tension element 11 or another tension element connected to the seismically isolated object 5 may generate a restoring force for both movement of the seismically isolated object 5 toward the +D1 side and movement of the seismically isolated object 5 toward the -D1 side. As can be understood from the above, the tension element 11 connected to the movable member 9 and the support structure 3 does not necessarily have to be provided.

[0087] Furthermore, unlike the illustrated example, instead of or in addition to the tension element 11 and / or other tension elements whose inclination angle θ1 changes with displacement of the seismic isolated object 5 in the D1 direction, a restoring element arranged parallel to the D1 direction may be provided. This restoring element is connected to the seismic isolated object 5 or the movable member 9 and also to the support structure 3, and generates a restoring force that resists displacement of the seismic isolated object 5 or the movable member 9 relative to the support structure 3 (at least) toward the +D1 side. This restoring element may be configured as either a tension element or a compression element. Note that if the tension element 11 and / or other tension elements whose inclination angle θ1 changes with displacement of the seismic isolated object 5 in the D1 direction are not provided, and a restoring element parallel to the D1 direction is provided, linear restoring force characteristics are added together instead of the curved restoring force characteristics indicated by line Ln1 in FIG. 3 .

[0088] (4.2.3. Compression Factor) The configuration of the compression element 13 may be similar to various known configurations. For example, like the tension element 11, the compression element 13 may be configured to include a helical spring, a leaf spring, an air spring, or rubber. That is, the compression element 13 may be configured to include an appropriate elastic body, and the elastic force generated as a result of deformation may be used as a restoring force. The compression element 13 generates a restoring force against contraction, and typically, the elastic body is a compression spring that generates a restoring force against contraction. However, the elastic body included in the compression element 13 may also be one that generates a restoring force against tension (a tension spring). For example, the compression element 13 may have a telescopic structure and a tension spring interposed between portions of the telescopic structure that move apart in response to contraction.

[0089] 1(a), the compression element 13 has a connecting portion 13a connected to the movable member 9 and a connecting portion 13b connected to the support structure 3. As can be understood from the above description, the connecting portion 13a allows the compression element 13 to rotate about an axis parallel to the D3 direction relative to the movable member 9. Similarly, the connecting portion 13b allows the compression element 13 to rotate about an axis parallel to the D3 direction relative to the support structure 3. The connecting portions 13a and 13b may have various configurations, and may be, for example, known configurations.

[0090] The compression element 13 generates a restoring force that resists compression and has a positive spring constant. In other words, the compression element 13 generates a restoring force that moves the connecting portions 11a and 11b apart in the direction connecting the two, and this restoring force increases as the connecting portions 13a and 13b approach each other in the connecting direction.

[0091] As described above, in the stationary state (FIG. 1(a)), the compression element 13 (in other words, the direction from the connecting portion 13a to the connecting portion 13b) is inclined such that the connecting portion 13b (the support structure 3 side) is located closer to the +D1 side than the connecting portion 13a (the seismically isolated object 5). The magnitude of the inclination angle θ2 (symbol shown in FIG. 1(b)) in the stationary state is arbitrary. For example, the inclination angle θ2 may be 10° or more, 30° or more, 40° or more, or 50° or more, or may be 80° or less, 70° or less, 60° or less, 50°, or 40° or less. The above lower and upper limits may be arbitrarily combined as long as no contradiction occurs.

[0092] As described above, the compression element 13 is not compressed (does not generate a restoring force) in a stationary state. However, as mentioned in the description of the tension element 11, the compression element 13 may generate a restoring force in a stationary state. In this case, the component of the restoring force of the compression element 13 parallel to the D1 direction may be balanced with, for example, the component of the restoring force of the tension element 11 in the D1 direction (when the application point 11a is inclined so as to be located closer to the -D1 side than the application point 11b) and / or a reaction force from a stopper (not shown) that restricts movement of the movable member 9 toward the -D1 side.

[0093] As already described, the connecting portion 13a to the seismic isolation object 5 can move further toward +D1 than the connecting portion 13b to the support structure 3 by movement of the movable member 9 toward the +D1 side (FIG. 2(a)). However, such movement of the movable member 9 does not have to be permitted. For example, before the connecting portion 13a moves further toward +D1 than the connecting portion 13b, a stopper (not shown) provided on the support structure 3 may come into contact with the movable member 9 from the +D1 side.

[0094] (4.3. Other components of the seismic isolation system) The seismic isolation system 1 may have various components other than those described above. For example, as mentioned in the description of the tension element 11, the seismic isolation system 1 may have a restoring element that generates a restoring force, separate from the tension element 11 and the compression element 13. The seismic isolation system 1 may also have a damping element that generates a damping force. The damping force acts on the seismic isolation object 5, for example, in a direction opposite to the direction of the relative velocity of the seismic isolation object 5 with respect to the support structure 3. The damping force increases, for example, as the relative velocity increases, and is typically proportional to the relative velocity.

[0095] The restoring element (separate from the tension element 11 and the compression element 13) and / or the damping element may be, for example, an integral part of the isolator 7, or may be separate from the isolator 7. Examples of the former include the restoring force of laminated rubber and the frictional resistance force of a sliding bearing. In this case, the restoring element and / or the damping element are conceptualized as components of the restoring function and / or the damping function of the isolator 7. The restoring element and / or the damping element described here may be considered as part of the displacement suppression device 15 in the seismic isolation system 1, whether or not they are an integral part of the isolator 7.

[0096] (5. Typical example of seismic isolation system configuration) 5 is a schematic diagram showing the configuration of a seismic isolation system 1A according to an embodiment. More specifically, this figure shows the seismic isolation system 1A in a stationary state, and corresponds to FIG. 1(a).

[0097] 1(a) to 2(b), the seismic isolation system 1A adds a movable member 9 (9B), a tension element 11 (11B), and a compression element 13 (13B) not only to the +D1 side but also to the -D1 side. With this configuration, for example, the displacement of the seismic isolation object 5 is suppressed both when it is displaced to the +D1 side and when it is displaced to the -D1 side.

[0098] The members on the +D1 side may be designated with the letter A and referred to as the movable member 9A, tension element 11A, and compression element 13A, respectively. The members on the -D1 side may be designated with the letter B and referred to as the movable member 9B, tension element 11B, and compression element 13B, respectively.

[0099] 1(a) to 2(b) may be regarded as a configuration that actually has the movable member 9, tension element 11, and compression element 13 only on the +D1 side, or as a conceptually extracted portion of the seismic isolation system 1A (or other examples of seismic isolation systems described later). However, for convenience, in the explanation of the seismic isolation system 1A, the former will be assumed unless otherwise specified.

[0100] Generally, a seismic isolation system generates a restoring force and a damping force against displacements on both sides in a predetermined direction. Therefore, the seismic isolation system 1A shown in Fig. 5 can be said to be a typical example of the seismic isolation system according to the embodiment.

[0101] 1(a) and the like may be used, for example, when there is little need to suppress displacement of the seismic isolation object 5 to the -D1 side by the displacement suppression device 15, and / or when displacement of the seismic isolation object 5 to the -D1 side is preferable to displacement to the +D1 side. Such a case may be, for example, when the seismic isolation object 5 is a piece of furniture placed near the wall of a room, and the +D1 side (the side where displacement is suppressed) is the center of the room (from another perspective, the side where people are present), and the -D1 side is the wall side.

[0102] The descriptions of the movable member 9, tension element 11, and compression element 13 in the seismic isolation system 1 may be applied to the movable member 9A, tension element 11A, and compression element 13A in the seismic isolation system 1A. Furthermore, the descriptions of the movable member 9, tension element 11, and compression element 13 in the seismic isolation system 1 may be applied to the movable member 9B, tension element 11B, and compression element 13B, for example, by replacing the term -D1 with the term +D1.

[0103] The components on the +D1 side (9A, 11A, 13A, etc.) and the components on the -D1 side (9B, 11B, 13B, etc.) may be configured to be line-symmetric (and / or plane-symmetric) with respect to an axis of symmetry (and / or plane of symmetry) not shown that is perpendicular to the D1 direction. For example, the components on the +D1 side and the components on the -D1 side may have the same (including symmetric) shape, dimensions, and material, and may be arranged line-symmetric (and / or plane-symmetric) with respect to each other.

[0104] However, the two components may differ from each other within the scope of producing equivalent restoring forces in the D1 direction. For example, in theory, the two components may be positioned differently around an axis parallel to the D1 direction. Furthermore, the components on the +D1 side and the -D1 side may differ in configuration so that the actions they produce are different from each other. For example, as already mentioned, the seismic isolation system 1 shown in FIG. 1(a) may be used in cases where there is little need to suppress displacement to the -D1 side. In such cases, the restoring force characteristics of the components on the +D1 side and the -D1 side may differ.

[0105] In the illustrated example, the component that suppresses displacement of the seismic isolation object 5 to the +D1 side is located on the +D1 side of the seismic isolation object 5, and the component that suppresses displacement of the seismic isolation object 5 to the -D1 side is located on the -D1 side of the seismic isolation object 5. Conversely to the above, the component that suppresses displacement of the seismic isolation object 5 to the +D1 side may be located on the -D1 side of the seismic isolation object 5, and the component that suppresses displacement of the seismic isolation object 5 to the -D1 side may be located on the +D1 side of the seismic isolation object 5. For example, a first convex portion protruding toward the -D2 side may be provided at the -D1 side end of the seismic isolation object 5, which is longer in the D1 direction than the example shown, and the components on the +D1 side of Figure 5 are arranged to apply a restoring force to the first convex portion from the +D1 side to the -D1 side, and a second convex portion protruding toward the -D2 side may be provided at the +D1 side end of the seismic isolation object 5, and the components on the -D1 side of Figure 5 are arranged to apply a restoring force to the second convex portion from the -D1 side to the +D1 side, and as a result, the positional relationship between the components on the +D1 side of Figure 5 and the components on the -D1 side of Figure 5 may be reversed from that in the example shown.

[0106] In the explanation of the seismic isolation system 1, it was mentioned that when the seismic isolation object 5 is at the initial position P0 (or, from another perspective, when the seismic isolation system 1 is in a stationary state), the tension element 11 and the compression element 13 may or may not generate a restoring force. The balancing of the D1-direction component of the restoring force in the latter case was also mentioned. In the seismic isolation system 1A, when the tension element 11 and / or the compression element 13 generate a restoring force in a stationary state, the D1-direction component of the restoring force may be balanced between the component on the -D1 side and the component on the +D1 side via the seismic isolation object 5. For example, the tension element 11A and the tension element 11B may be balanced, and / or the compression element 13A and the compression element 13B may be balanced.

[0107] (6. Specific examples of seismic isolation system configurations) Fig. 6 is a perspective view (partially see-through) showing a more specific configuration of the seismic isolation system 1B. Fig. 7 is a diagram showing a seismic isolation system 1C in the same manner as Fig. 1(a) and the like.

[0108] These figures are accompanied by an orthogonal coordinate system xyz. The relationship between the orthogonal coordinate system xyz and the vertical direction (direction of gravity) is arbitrary. In the following explanation, for convenience, the +z side is assumed to be vertically upward. The following explanation will be basically based on FIG. 6. Please refer to FIG. 7 as necessary to understand the correspondence between the explanation regarding FIGS. 1(a) to 5 and the configuration shown in FIG. 6.

[0109] 6 shows an isolator 7B as a specific example of the isolator 7. The isolator 7B has a support member 21 fixed to the support structure 3 and a seismic isolation member 23 fixed to the seismic isolation object 5. The seismic isolation member 23 is supported by the support member 21 and is allowed to move in any direction (any horizontal direction) along the xy plane (for example, parallel to the xy plane). This allows the seismic isolation object 5 to move relative to the support structure 3 in any horizontal direction.

[0110] Unlike the description here, the support member 21 may be part of the support structure 3. Similarly, the seismic isolation member 23 may be part of the seismic isolation object 5. From another perspective, the isolator 7 (7B) does not have to be clearly distinguishable from the support structure 3 and / or the seismic isolation object 5.

[0111] The isolator 7B has, for example, an intermediate member 25 interposed between the support member 21 and the seismic isolation member 23. The intermediate member 25 is movable in the y direction relative to the support member 21 by a linear guide 27Y extending in the y direction. The seismic isolation member 23 is movable in the x direction relative to the intermediate member 25 by a linear guide 27X extending in the x direction. This allows the seismic isolation member 23 to move in any horizontal direction relative to the support member 21.

[0112] The shapes, dimensions, and materials of the support members 21, the seismic isolation members 23, and the intermediate members 25 are arbitrary. In the illustrated example, they are configured in a roughly plate-like shape and are rectangular in plan view. The actual shapes may be completely different from these shapes. However, for convenience, in describing the embodiments, the explanation may be made on the assumption that the shapes of the support members 21, the seismic isolation members 23, and the intermediate members 25 are the shapes shown in the drawings.

[0113] In a plan view, openings 21h, 23h, and 25h are formed in the centers of the support member 21, the seismic isolation member 23, and the intermediate member 25. For example, the openings 21h, 23h, and 25h overlap one another in a stationary state. For example, when the seismic isolation object 5 is a computer (e.g., a server), such openings may be used as openings through which cables connected to the computer are inserted.

[0114] The intermediate member 25 is guided in the y direction relative to the support member 21 by the linear guide 27Y. From another perspective, movement of the intermediate member 25 in directions other than the y direction relative to the support member 21 is restricted. However, movement of the intermediate member 25 in the up and down direction may be restricted by gravity and a reaction force, rather than by the linear guide 27Y. Although the support member 21, the intermediate member 25, and the linear guide 27Y have been described as examples, the same applies to the intermediate member 25, the seismic isolation member 23, and the linear guide 27X.

[0115] Linear guide 27X may have, for example, a rail 7a, and may have guided members 29X, 31, and 33 guided by rail 7a. Similarly, linear guide 27Y may have, for example, a rail 7a, and may have guided members 29Y (FIG. 7), 31 (see that of linear guide 27X), and 33 guided by rail 7a. Note that the configurations of linear guides 27X and 27Y may be similar except for the fact that the guiding directions are different from each other, or may have differences.

[0116] The rail 7a and the guided members 29X, 29Y, 31, and 33 may have any specific configuration. The rail 7a and the guided members may be part of the support member 21, the intermediate member 25, or the seismic isolation member 23. A rolling member (e.g., a ball) may or may not be interposed between the rail 7a and the guided members. In the former case, the linear guide may be, for example, an all-ball type or a ball-cage type.

[0117] In the illustrated example, linear guide 27X has rail 7a fixed to intermediate member 25 and guided members 29X, 31, and 33 fixed to seismic isolation member 23. Contrary to the illustrated example, rail 7a may be fixed to seismic isolation member 23 and guided members may be fixed to intermediate member 25. Although linear guide 27X has been taken as an example, similarly, linear guide 27Y may have rail 7a (and guided members) provided on either support member 21 or intermediate member 25. However, the following description will be based on the illustrated embodiment for convenience.

[0118] When focusing on the seismic isolation member 23 and the intermediate member 25, the guided member 29X corresponds to the seismic isolation object 5 in FIGS. 1(a) to 5, and the intermediate member 25 corresponds to the support structure 3 in FIGS. 1(a) to 5. The x direction corresponds to the D1 direction, the y direction corresponds to the D2 direction, and the z direction corresponds to the D3 direction. Two movable members 9X are located on both sides of the guided member 29X and are guided by the rails 7a of the linear guides 27X. Each movable member 9X is connected to a tension element 11X and a compression element 13X that are connected to the intermediate member 25.

[0119] When focusing on the intermediate member 25 and the support member 21, the guided member 29Y (FIG. 7) corresponds to the seismic isolation object 5 in FIGS. 1(a) to 5, and the support member 21 corresponds to the support structure 3 in FIGS. 1(a) to 5. The y direction corresponds to the D1 direction, the x direction corresponds to the D2 direction, and the z direction corresponds to the D3 direction. As shown in FIG. 7, two movable members 9Y guided by the rails 7a of the linear guide 27Y are located on both sides of the guided member 29Y. Each movable member 9Y is connected to a tension element 11Y and a compression element 13Y connected to the support member 21.

[0120] 6, the tension element 11X is connected to a pin 35 protruding from the movable member 9X and a pin 37 protruding from the intermediate member 25. In this configuration, rotation of the tension element 11X about an axis parallel to the z direction (direction D3) may be achieved by rotation of the tension element 11X relative to the pin, or by rotation of the pin relative to the movable member 9X or the intermediate member 25. The same applies to the tension element 11Y, which is hidden by the intermediate member 25 and not shown.

[0121] Furthermore, the compression element 13X is connected to a pin 39 protruding from the movable member 9X and a pin 41 protruding from the intermediate member 25. In this configuration, similar to the tension element 11X, rotation of the compression element 13X about an axis parallel to the z direction (direction D3) may be achieved by rotation of the compression element 13X relative to the pin, or by rotation of the pin relative to the movable member 9X or the intermediate member 25. The same applies to the compression element 13Y, which is hidden by the intermediate member 25 and not shown. Although not particularly shown, the compression element 13X may be configured so as not to bend when compressed. For example, the above-mentioned telescopic structure may be adopted.

[0122] (7. Summary of embodiments) As described above, the seismic isolation system 1 (as well as 1A and 1B) has the isolator 7, the first movable member (9), and the first compression element (13). The isolator 7 allows relative movement of a first object (e.g., the seismic isolation object 5) with respect to a second object (e.g., the support structure 3) to a first side (+D1 side) in a first movement direction (D1 direction) and to a second side (-D1 side) opposite the first side. The first movable member is capable of relative movement with respect to the second object to a third side (+D1 side) in the second movement direction (D1 direction) and to a fourth side (-D1 side) opposite the third side. When a position in the second movement direction is virtually coordinate-transformed into a position in the first movement direction so that the first side and the third side are the same side and the second side and the fourth side are the same side, relative movement of the first object (seismic isolation object 5) and the first movable member from a predetermined first relative position (e.g., a position where they abut) to the first side (+D1 side) is restricted, and relative movement of the first object with respect to the first movable member from the first relative position to the second side (-D1 side) is permitted. The first compression element has a first connecting portion (13a) connected to the first movable member and a second connecting portion (13b) connected to the second object (support structure 3). The first compression element generates a restoring force that moves the first connecting portion and the second connecting portion apart in a first force direction (reference numeral omitted) connecting the first connecting portion and the second connecting portion, the restoring force increasing as the first connecting portion and the second connecting portion approach each other. In a stationary state, the first force direction is inclined relative to a direction (D2 direction) perpendicular to the second movement direction (D1 direction) in such a way that the second connecting portion is located on the third side (+D1 side) of the first connecting portion.

[0123] Therefore, as mentioned above, when the first object (the seismically isolated object 5) is displaced toward the first side (+D1 side), the restoring force characteristic indicated by line Ln2 in FIG. 3 can be utilized. This restoring force characteristic alone, or in combination with the restoring force characteristic of the tension element 11 or another tension element, can relatively shorten the natural period at the initial position P0 and relatively lengthen the natural period when the displacement reaches a certain magnitude. This can, for example, reduce the likelihood of large displacement due to long-period vibration. Meanwhile, when the first object (the seismically isolated object 5) is displaced from the initial position P0 toward the second side (-D1 side), the first object is allowed to move toward the second side relative to the movable member 9 (however, this does not necessarily have to occur due to the influence of inertial force, etc.). Therefore, the influence of the restoring force characteristic of the compression element 13 on the displacement of the first object toward the second side can be reduced. As a result, in designing the compression element 13, it is only necessary to basically focus on the characteristics in displacement toward the first side (the characteristics when the inclination angle θ2 increases from the initial value), which simplifies the design.

[0124] The first movement direction (movement direction of the first object) and the second movement direction (movement direction of the first movable member) may be the same direction. The first side and the third side may be the same side. The second side and the fourth side may be the same side. The first relative position may be a position where the first movable member (9) aligns with the first object (seismic isolation object 5) (for example, a position where they directly abut) from the first side (+D1 side) to the second side (-D1 side).

[0125] In this case, the configuration is simpler than, for example, a mode in which a flexible member is used to connect the first object (seismic isolation object 5) and the first movable member 9. Furthermore, when a flexible member is used, it is difficult to control the position of the bent portion when the flexible member is bent, but this inconvenience does not arise.

[0126] The seismic isolation system 1 may include a first tension element (11). The first tension element may be connected to one of the first movable member (9) and the first object (e.g., the seismic isolation object 5) and a second object (e.g., the support structure 3). At least a portion of the first tension element may span between a first point of application (11a) of the one object and a second point of application (11b) of the second object. As described above, the connection portion and the point of application may be the same or different. The first tension element may generate a restoring force that increases with contraction and reduces the contraction. In a stationary state, the direction (reference numeral omitted) connecting the first point of application and the second point of application may be along a direction (D2 direction) perpendicular to the second movement direction (D1 direction).

[0127] In this case, for example, as shown by line Ln1 in FIG. 3, a restoring force characteristic in which the spring constant increases with increasing displacement can be utilized for the restoring force acting on the first object (seismic isolation object 5) in the first movement direction (D1 direction). As a result, for example, when combined with the restoring force characteristic of the compression element 13 shown by line Ln2, the restoring force characteristic of the compression element 13 can be primarily utilized near the initial position P0. On the other hand, when the displacement increases to a certain extent and the restoring force of the compression element 13 decreases, it is easy to compensate for this decrease in restoring force. As a result, for example, it is easy to maintain the restoring force at a constant magnitude or reduce the likelihood that the restoring force will become a negative value. Furthermore, for example, as described with reference to FIG. 4, unlike the prior art, the restoring force can be increased when the displacement becomes excessive, thereby suppressing the displacement.

[0128] The first movable member (9) may be movable until the first connecting portion (13a) is positioned closer to the third side (+D1 side) than the second connecting portion (13b).

[0129] In this case, when the displacement becomes large, the restoring force of the compression element 13 becomes a negative value. In other words, the compression element 13 can exert a restoring force over a wide range. As a result, the degree of freedom in designing the seismic isolation system 1 is improved.

[0130] In a stationary state, the first object (for example, the seismic isolation object 5) and the first movable member (9) may be located at a first relative position (for example, a position where they abut against each other).

[0131] In this case, unlike a case where the seismic isolation object 5 and the movable member 9 are separated in a stationary state, if the first object deviates even slightly from the initial position P0 (or even before that), a restoring force can be applied to the first object from the first movable member. As a result, for example, after an earthquake, it is easy to return the seismic isolation object 5 to the initial position P0.

[0132] The seismic isolation system 1A (and 1B) may have a second movable member (9B) and a second compression element (13B) in addition to the first movable member (9A) and the first compression element (13A). The second movable member may be movable relative to a second object (e.g., the support structure 3) to a fifth side (+D1 side) in a third movement direction (D1 direction) and to a sixth side (-D1 side) opposite to the fifth side. When a position in the third movement direction is virtually coordinate-transformed into a position in the first movement direction (movement direction of the first object) so that the first side (+D1 side) and the fifth side are the same side and the second side (-D1 side) and the sixth side are the same side, relative movement of the first object (e.g., seismic isolation object 5) with respect to the second movable member from a predetermined second relative position (e.g., a position where the two abut) to the second side (-D1 side) may be restricted, and relative movement of the first object with respect to the second movable member from the second relative position to the first side (+D1 side) may be permitted. The second compression element may have a third connector (11a) connected to the second movable member and a fourth connector (11b) connected to the second object. The second compression element may generate a restoring force that moves the third and fourth connecting portions apart in a second force direction (symbol omitted) connecting the third and fourth connecting portions, the restoring force increasing as the third and fourth connecting portions approach each other. In a stationary state, the second force direction may be inclined with respect to a direction (D2 direction) perpendicular to the third movement direction (D1 direction) such that the fourth connecting portion is located closer to the sixth side (-D1 side) than the third connecting portion.

[0133] 5, the seismic isolation system 1A may generate restoring forces against displacements on both sides in the D1 direction by the compression elements 13A and 13B, thereby meeting the general need to suppress bidirectional displacements of the seismic isolation object 5.

[0134] In the above embodiments, the combination of the seismic isolation object 5 and the support structure 3, the combination of the seismic isolation member 23 and the intermediate member 25, and the combination of the intermediate member 25 and the support member 21 are each examples of combinations of the first object and the second object.

[0135] The D1 direction is an example of the first movement direction, the second movement direction, and the third movement direction. The +D1 side is an example of the first side, the third side, and the fifth side. The -D1 side is an example of the second side, the fourth side, and the sixth side. As is clear from the description of the correspondence between the Cartesian coordinate system xyz in FIGS. 6 and 7 and the Cartesian coordinate system D1D2D3 in FIG. 5, the x direction and the y direction are also examples of the first to third movement directions.

[0136] The movable member 9 in FIG. 1(a) and the movable member 9A in FIG. 5 are each an example of a first movable member. The compression element 13 in FIG. 1(a) and the compression element 13A in FIG. 5 are each an example of a first compression element. The movable member 9B in FIG. 5 is an example of a second movable member. The compression element 13B in FIG. 5 is an example of a second compression element. As is clear from the explanation of the correspondence between the Cartesian coordinate system xyz in FIGS. 6 and 7 and the Cartesian coordinate system D1D2D3 in FIG. 5, the movable members 9X and 9Y and the compression elements 13X and 13Y shown in FIGS. 6 and 7 are also examples of the various members and elements described above.

[0137] The technology according to the present disclosure is not limited to the above-described embodiments and may be implemented in various forms.

[0138] For example, the restoring force characteristics of a seismic isolation system are not limited to those shown by line Ln3 in Figure 3 or line Ln5 in Figure 4. For example, in the examples of Figures 3 and 4, after the displacement reaches a certain level and the restoring force reaches a plateau, the restoring force increases as the displacement increases further. However, within the movable range of the seismic isolation object, the restoring force that has reached a plateau does not have to start increasing.

[0139] Furthermore, for example, a seismic isolation system in which the seismic isolation object is movable in two directions relative to the support structure may be configured in such a way that the intermediate member 25 is not required, unlike the seismic isolation system shown in Fig. 6. For example, it is as follows.

[0140] A unit including a guided member 29X that is movable in the x direction relative to the support member 21 (29X, as well as 9X, 11X, 13X, and 27X, etc.) and a unit including a guided member 29Y that is movable in the y direction relative to the support member 21 (29Y, as well as 9Y, 11Y, 13Y, and 27Y, etc.) are provided on the support member 21 (on the same plane). From another perspective, in the configuration of FIG. 6, the unit related to guided member 29X is provided on the support member 21, not on the intermediate member 25, and the intermediate member 25 is eliminated. Then, a seismic isolation member 23 is disposed on the guided members 29X and 29Y. Unlike in FIG. 6, a linear guide is interposed between the seismic isolation member 23 and the guided member 29X to guide them so that they can move relatively in the y direction (in other words, to restrict relative movement in the x direction). Similarly, a linear guide is interposed between the seismic isolation member 23 and the guided member 29Y to guide them so that they can move relatively in the x direction (in other words, to restrict relative movement in the y direction).

[0141] In yet another example, a unit including a guided member 29X and a unit including a guided member 29Y are provided on the support member 21 (on the same plane). The guided member 29X is movable not only in the x direction but also in the y direction. For example, the guided member 29X is supported on the support member 21 not via a linear guide 27X but via a seismic isolation bearing that allows movement in any horizontal direction. Note that, as in FIG. 6, the movement of the movable member 9X in the y direction is restricted by being guided by the linear guide 27X. Similarly, the guided member 29Y is movable not only in the y direction but also in the x direction. The seismic isolation member 23 is disposed on and fixed to the guided members 29X and 29Y. The shapes and dimensions of the guided member 29X and the movable member 9X are such that the guided member 29X and the movable member 9X can engage with each other in the x direction even when the guided member 29X moves in the y direction. Similarly, the shapes and dimensions of the guided member 29Y and the movable member 9Y are such that even if the guided member 29Y moves in the x direction, the guided member 29Y and the movable member 9Y can engage with each other in the y direction. [Explanation of symbols]

[0142] 1...seismic isolation system, 3...support structure (an example of a second object), 5...seismic isolation object (an example of a first object), 7...isolator, 9...movable member (an example of a first movable member), 11...tension element (an example of a first tension element), 13...compression element (an example of a first compression element), 13a...connecting portion (an example of a first connecting portion), 13b...connecting portion (an example of a second connecting portion), 15...displacement suppression device.

Claims

1. an isolator that allows relative movement of a first object with respect to a second object toward a first side in a first movement direction and a second side opposite to the first side; a first movable member that is movable relative to the second object toward a third side in a second movement direction and a fourth side opposite to the third side, and that restricts relative movement of the first object with respect to the first movable member from a predetermined first relative position between the first object and the first movable member to the first side and allows relative movement of the first object with respect to the first movable member from the first relative position to the second side when a position in the second movement direction is virtually coordinate-transformed to a position in the first movement direction so that the first side and the third side become the same side and the second side and the fourth side become the same side; a first compression element having a first connecting portion connected to the first movable member and a second connecting portion connected to the second object, which generates a restoring force that moves the first connecting portion and the second connecting portion apart in a first force direction connecting the first connecting portion and the second connecting portion, the restoring force increasing as the first connecting portion and the second connecting portion approach each other, and which is inclined in a direction such that, in a stationary state, the second connecting portion is located on the third side relative to the first connecting portion, with respect to a direction perpendicular to the second moving direction; at least one of a restoring element that generates a restoring force that resists relative movement of the first movable member with respect to the second object toward the third side, and a stopper that prohibits the first connecting portion from moving toward the third side beyond the second connecting portion; A seismic isolation system having

2. the first movement direction and the second movement direction are the same direction, the first side and the third side are the same side, the second side and the fourth side are the same side, The first relative position is a position where the first movable member is aligned with the first object from the first side to the second side. The seismic isolation system according to claim 1 .

3. a first tension element as the restoring element, connected to one of the first movable member and the first object and the second object; The first tension element is At least a portion of the first point of action of the one object and a second point of action of the second object are located between the first point of action of the one object and the second point of action of the second object. producing a restoring force that increases with elongation of the first tension element and reduces the elongation; In a stationary state, a direction connecting the first point of application and the second point of application is along a direction perpendicular to the second direction of movement. The seismic isolation system according to claim 1 or 2.

4. A device comprising: the restoring element; and the stopper; The first movable member is movable until the first connecting portion is positioned on the third side relative to the second connecting portion. The seismic isolation system according to any one of claims 1 to 3.

5. In a stationary state, the first object and the first movable member are located at the first relative position. The seismic isolation system according to any one of claims 1 to 4.

6. a second movable member that is movable relative to the second object toward a fifth side in a third movement direction and a sixth side opposite to the fifth side, and when a position in the third movement direction is virtually coordinate-transformed into a position in the first movement direction so that the first side and the fifth side become the same side and the second side and the sixth side become the same side, the second movable member restricts relative movement of the first object with respect to the second movable member from a predetermined second relative position between the first object and the second movable member to the second side and allows relative movement of the first object with respect to the second movable member from the second relative position to the first side; a second compression element having a third connecting portion connected to the second movable member and a fourth connecting portion connected to the second object, which generates a restoring force that moves the third connecting portion and the fourth connecting portion apart in a second force direction connecting the third connecting portion and the fourth connecting portion, the restoring force increasing as the third connecting portion and the fourth connecting portion approach each other, and which is inclined in a direction such that, in a stationary state, the second force direction is inclined with respect to a direction perpendicular to the third movement direction such that the fourth connecting portion is located on the sixth side relative to the third connecting portion; The seismic isolation system according to any one of claims 1 to 5, comprising:

7. A displacement suppression device that suppresses relative movement of a first object with respect to a second object toward a first side in a first movement direction and a second side opposite to the first side, a first movable member that is movable relative to the second object toward a third side in a second movement direction and a fourth side opposite to the third side, and that restricts relative movement of the first object with respect to the first movable member from a predetermined first relative position between the first object and the first movable member to the first side and allows relative movement of the first object with respect to the first movable member from the first relative position to the second side when a position in the second movement direction is virtually coordinate-transformed to a position in the first movement direction so that the first side and the third side become the same side and the second side and the fourth side become the same side; a first compression element having a first connecting portion connected to the first movable member and a second connecting portion connected to the second object, which generates a restoring force that moves the first connecting portion and the second connecting portion apart in a first force direction connecting the first connecting portion and the second connecting portion, the restoring force increasing as the first connecting portion and the second connecting portion approach each other, and which is inclined in a direction such that, in a stationary state, the second connecting portion is located on the third side relative to the first connecting portion, with respect to a direction perpendicular to the second moving direction; at least one of a restoring element that generates a restoring force that resists relative movement of the first movable member with respect to the second object toward the third side, and a stopper that prohibits the first connecting portion from moving toward the third side beyond the second connecting portion; A displacement suppression device having:

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