JP6430192B2 - Seismic isolation device - Google Patents

Description

  The present invention relates to a seismic isolation device, which can prevent overturning and breakage due to the occurrence of an earthquake in a small and lightweight device.

Seismic isolation devices are used as one of the earthquake countermeasures, and not only large structures such as buildings, but also seismic isolation devices for ceramics, fine arts, and small and light equipment.
In seismic isolation devices for large structures such as buildings, seismic isolation bearings, dampers, and restoration means between the building that is the upper structure and the foundation that is the lower structure and joined to the ground It is configured with a mechanism to block energy from earthquake motion.

  The seismic isolation device for small and lightweight devices is based on the principles of rolling isolation and sliding isolation, for example, it has a structure with two or more layers above and below, with rollers and balls arranged between them. In addition, it uses rolling friction to absorb the energy of earthquake motion.

  For example, a seismic isolation device for small and light objects such as arts and crafts is disclosed in Patent Document 1, and as shown in FIG. 8, a lower substrate 1 and an upper portion located on the substrate 1 are disclosed. An intermediate plate 2 having a base plate 3 and rotatably supporting a plurality of spherical rotating bodies 7 in contact with the lower substrate 1 and the upper base plate 3 is formed between the substrate 1 and the base plate 3. The base plate 1 and the base plate 3 are urged so that the base plate 3 returns to the position immediately above the base plate 1 by an elastic body 4 such as a plurality of coil springs or rubber springs. Configured. In the figure, 5 and 6 are rods for attaching an elastic body, 7 is a spherical rotating body, 8 is a support base, and 9 is a fixture.

JP 2007-239907 A

In such a seismic isolation device of Patent Document 1, a plurality of elastic bodies 4, for example, four coil springs, are arranged at equal intervals of 90 degrees with respect to the center of the base plate 3 in order to return the base plate 3 directly above the substrate 1. The coil springs are connected between the substrate 1 and the base plate 3, and these coil springs are arranged in a radial direction with respect to the center of the base plate 3, and the expansion / contraction direction of the coil spring is a radial direction in which the coil spring is attached. It is supposed to match.
For this reason, when the base plate 3 moves due to the earthquake motion, the center of the base plate 3 moves in any radial direction, and depending on the direction of the earthquake motion, resonance occurs at the natural frequency of the coil spring, and the expansion and contraction direction changes. There is a problem that vibration is amplified by the matched coil spring.
Further, in this seismic isolation device, when it is intended to secure the movable range of the base plate 3, it is necessary to secure a space where the coil spring is compressed, and the size of the device increases accordingly (FIG. 5). (See (c)).

  The present invention has been made in view of such problems in the prior art, and can prevent amplification of vibration due to resonance at the natural frequency of the elastic body for returning to the origin, ensuring a sufficient range of motion. An object of the present invention is to provide a seismic isolation device capable of reducing the size of the device.

In order to solve the above-mentioned problems, after carrying out an intensive study on an elastic body that has the effect of attenuating the energy of seismic motion of the seismic isolation device and urges the loading plate member on which the loaded load is loaded to return to the origin, The center of the plate member is moved in the radial direction, whereas the conventional elastic body is installed with its expansion / contraction direction aligned with the radial direction, which is the movement direction. When resonance occurs, it is found that a phenomenon of amplifying vibration occurs due to an elastic body having the same expansion / contraction direction, and shifting the movement direction of the center of the loading plate member and the expansion / contraction direction of the elastic body prevents the vibration from being amplified. It turns out that it is effective, and completed this invention.
In addition, shifting the movement direction of the center of the loading plate member and the expansion / contraction direction of the elastic body to effectively reduce the space in which the elastic body can be compressed is effective in securing a movable range and reducing the size of the seismic isolation device. (See FIGS. 5 (a) and 5 (b)).
A specific configuration of the present invention based on such knowledge is as follows.

That is, in the seismic isolation device according to claim 1 of the present invention, the loading plate member is movable on the base plate member via at least one of the sliding member and the rolling member, while the base plate member and the previously described load are provided. A seismic isolation device in which a plurality of elastic members are connected to a plate member,
Expansion and contraction of the elastic member by shifting the other end connection point of the elastic member to the load plate member described above with respect to a linear direction connecting one end connection point of the elastic member to the base plate member and the center point of the load plate member described above. A direction in which the direction and the linear direction are connected without matching, and a direction connecting the one end connection point of the elastic member to the base plate member and the other end connection point to the load plate member, and the load plate described above The angle formed between the center point of the member and the direction connecting the other end connection point to the load plate member is 10 degrees or more and 90 degrees or less, and the expansion and contraction directions of the elastic members do not overlap. Is.

In the seismic isolation device according to claim 2 of the present invention , the loading plate member is movable on at least one of the sliding member and the rolling member on the base plate member, while the base plate member and the above-described loading plate member A seismic isolation device in which a plurality of elastic members are connected to each other,
Expansion and contraction of the elastic member by shifting the other end connection point of the elastic member to the load plate member described above with respect to a linear direction connecting one end connection point of the elastic member to the base plate member and the center point of the load plate member described above. The base plate member is composed of a lower plate and an outer frame provided around the lower plate, and the load plate member is moved on the lower plate. An upper plate that is enabled, and a loading plate that is provided on the upper plate and faces the outer frame, and the upper plate on the lower plate includes at least one of the sliding member and the rolling member. On the other hand, the movable frame is movable between the outer frame and the load plate facing the outer frame by the earthquake motion. And it is characterized in that formed by movable in either the provided with at least sliding member and the rolling member and the plate can be supported.
In the seismic isolation device according to claim 3 of the present invention, the loading plate member is movable on at least one of the sliding member and the rolling member on the base plate member, while the base plate member and the above-described loading plate member A seismic isolation device in which a plurality of elastic members are connected to each other,
Expansion and contraction of the elastic member by shifting the other end connection point of the elastic member to the load plate member described above with respect to a linear direction connecting one end connection point of the elastic member to the base plate member and the center point of the load plate member described above. A direction in which the direction and the linear direction are connected without matching, and a direction connecting the one end connection point of the elastic member to the base plate member and the other end connection point to the load plate member, and the load plate described above The angle formed by the direction connecting the center point of the member and the other end connection point to the load plate member is 10 degrees or more and 90 degrees or less, and the base plate member is placed around the lower plate and the lower plate. The load plate member described above is provided on the upper plate and the upper plate which is movable on the lower plate. A loading plate facing the outer frame, wherein the upper plate is movable on the lower plate via at least one of the sliding member and the rolling member, while the outer frame, Between the outer frame and the above-described load plate, it is configured to be movable by providing at least one of a sliding member and a rolling member that can support the above-described load plate that is moved by earthquake motion. Is.

According to a fourth aspect of the present invention, in addition to the structure according to any one of the first to third aspects, the one end connection point of the elastic member to the base plate member is a center point of the base plate member. The concentric circle centered on the center of the load plate member is provided at three points spaced by 120 degrees, and the concentric circle centered on the center point of the load plate member described above is provided at three points at 120 degree intervals shifted by 60 degrees from the one end connection point. The other end connection point to the plate member is provided, and the six elastic members are connected between the one end connection point and the other end connection point, respectively. .

According to a fifth aspect of the present invention, in addition to the configuration according to any one of the first to third aspects , the seismic isolation device includes the one end connection point of the elastic member to the base plate member as a center point of the base plate member. The concentric circles centered on the center of the load plate member are provided at four locations at intervals of 90 degrees, and the concentric circles centered on the center point of the load plate member described above are provided at four locations at intervals of 90 degrees shifted from the one end connection point by 45 degrees. The other end connection point to the plate member is provided, and eight elastic members are connected between the one end connection point and the other end connection point, respectively. .

The seismic isolation device according to claim 6 of the present invention is configured such that, in addition to the configuration according to any one of claims 1 to 5 , the base plate member and the load plate member described above are each configured in a circular shape. It is a feature.

According to a seventh aspect of the present invention, in addition to the structure according to any one of the first to fifth aspects, the base plate member and the load plate member are each formed in a quadrangular shape. It is a feature.

Seismic isolation device according to claim 8 of the present invention, in addition to the configuration according to any one of claims 1 to 7 and one end point of connection to the base plate member of the elastic member, to the loading plate member It is characterized in that at least one of the other end connection points is provided at an interval.

The seismic isolation device according to claim 9 of the present invention has the structure described in any one of claims 1 to 8 , wherein the load on the load plate member is less than 10 kg, and the elastic member is configured by a coil spring. The spring constant is 0.0015 or more and 0.0040 N / mm or less, and the other end connection point of the elastic member to the load plate member is configured to be movable 16 cm or more on the base plate member. It is characterized by.

According to a tenth aspect of the present invention, in addition to the structure according to any one of the first to eighth aspects, the load applied to the load plate member is 10 kg or more and 50 kg or less, and the elastic member is a coil spring. The spring constant is 0.0020 or more and 0.0060 N / mm or less, and the other end connection point of the elastic member to the load plate member is configured to be movable on the base plate member by 20 cm or more. It is characterized by.

A seismic isolation device according to an eleventh aspect of the present invention includes the seismic isolation device according to any one of the first to tenth aspects as one unit, and a plurality of the unit on the load plate member described above. It is characterized in that one load can be placed.

According to the seismic isolation device of the first aspect of the present invention, the loading plate member can be moved on the base plate member via at least one of the sliding member and the rolling member, while the base plate member and the load described above are used. A seismic isolation device in which a plurality of elastic members are connected to a plate member, and the linear direction connecting one end connection point of the elastic member to the base plate member and the center point of the load plate member, The one end connection point of the elastic member to the base plate member is arranged by shifting the other end connection point of the elastic member to the load plate member without shifting the expansion / contraction direction of the elastic member and the linear direction. A direction connecting the other end connection point to the load plate member and the center point of the load plate member and the other end connection point to the load plate member. The angle between department direction, not more than 90 degrees 10 degrees, and as expansion and contraction direction between the elastic member do not overlap. Thereby , the connection point of the elastic member to the loading plate member with respect to the linear direction (radial direction at the center point) connecting the one end connection point that is the connection point of the elastic member to the base plate and the center point of the loading plate member; By shifting the other end connecting point from the linear direction, the elastic member's expansion / contraction direction and the loading plate member's moving direction at the time of an earthquake do not coincide, and the elastic member vibrates even if resonance occurs due to the natural vibration of the elastic member. Can be prevented, the loading plate member can be returned to the origin, and the energy due to the earthquake can be attenuated.
Moreover, it becomes a connection point of the elastic member to the loading plate member with respect to a linear direction (radiating direction at the center point) connecting the one end connection point that is a connection point of the elastic member to the base plate and the center point of the loading plate member. By shifting the other end connection point from the linear direction, the expansion / contraction direction of the elastic member and the movement direction of the loading plate member at the time of the earthquake do not coincide with each other, and the space for the elastic body to be compressed / shrinked is made extremely small to provide a sufficient range of motion. The seismic isolation device can be reduced in size (see FIGS. 5A and 5B).
Further, a direction connecting the one end connection point of the elastic member to the base plate member and the other end connection point to the load plate member described above, the center point of the load plate member described above, and the other to the load plate member described above Since the angle formed with the direction connecting the end connection point is 10 degrees or more and 90 degrees or less, the elastic member is connected to the one end connection point without matching the expansion / contraction direction of the elastic member and the moving direction of the loading plate member at the time of earthquake. Can be attached between the connection point and the other end connection point, and even when the seismic vibration resonates with the natural frequency of the elastic member, the vibration of the elastic body that resonated is canceled by canceling each other's vibration. Can do.
In addition, the elastic member can be attached between the one end connection point and the other end connection point without matching the expansion / contraction direction of the elastic member and the movement direction of the loading plate member at the time of the earthquake, and the elastic body is compressed and contracted by the earthquake motion. It is possible to secure a sufficient range of motion by making the space to be made extremely small, and to reduce the size of the seismic isolation device.

According to the seismic isolation device of the second aspect of the present invention , the loading plate member can be moved on the base plate member via at least one of the sliding member and the rolling member, while the base plate member and the load described above are used. A seismic isolation device in which a plurality of elastic members are connected to a plate member, and the linear direction connecting one end connection point of the elastic member to the base plate member and the center point of the load plate member, Displacement of the other end connection point of the elastic member to the load plate member to displace the elastic member in the expansion / contraction direction and the linear direction so that the base plate member is arranged around the lower plate and the lower plate. An upper frame that is configured to be movable on the lower plate, and the upper plate. A loading plate that is disposed on the lower plate and is movable on at least one of the sliding member and the rolling member on the lower plate. And at least one of a sliding member and a rolling member that can support the above-described load plate that is moved by the earthquake motion between the outer frame and the above-described load plate. Thereby, the connection point of the elastic member to the loading plate member with respect to the linear direction (radial direction at the center point) connecting the one end connection point that is the connection point of the elastic member to the base plate and the center point of the loading plate member; By shifting the other end connecting point from the linear direction, the elastic member's expansion / contraction direction and the loading plate member's moving direction at the time of an earthquake do not coincide, and the elastic member vibrates even if resonance occurs due to natural vibration of the elastic member. Can be prevented, the loading plate member can be returned to the origin, and the energy due to the earthquake can be attenuated.
Moreover, it becomes a connection point of the elastic member to the loading plate member with respect to a linear direction (radiating direction at the center point) connecting the one end connection point that is a connection point of the elastic member to the base plate and the center point of the loading plate member. By shifting the other end connection point from the linear direction, the expansion / contraction direction of the elastic member and the movement direction of the loading plate member at the time of the earthquake do not coincide with each other, and the space for the elastic body to be compressed / shrinked is made extremely small to provide a sufficient range of motion The seismic isolation device can be reduced in size (see FIGS. 5A and 5B).
Further, the base plate member is composed of a lower plate and an outer frame provided around the lower plate, and the load plate member is placed on the upper plate which is movable on the lower plate and the upper plate. The loading plate is provided and is opposed to the outer frame, and the upper plate is movable on the lower plate via at least one of the sliding member and the rolling member, Since at least one of the sliding member and the rolling member is provided between the outer frame and the load plate facing the outer frame so as to be able to support the load plate that is moved by the earthquake motion, the structure is movable. Depending on the seismic motion, when the loading plate member relatively moves, the lower surface of the loading plate member Even in such a case, friction is reduced by a sliding member or a rolling member between the outer frame and the loading plate, and a desired seismic isolation effect can be obtained by smooth displacement. .
According to the seismic isolation device of the third aspect of the present invention, the loading plate member can be moved on the base plate member via at least one of the sliding member and the rolling member, while the base plate member and the load described above are used. A seismic isolation device in which a plurality of elastic members are connected to a plate member, and the linear direction connecting one end connection point of the elastic member to the base plate member and the center point of the load plate member, The one end connection point of the elastic member to the base plate member is arranged by shifting the other end connection point of the elastic member to the load plate member without shifting the expansion / contraction direction of the elastic member and the linear direction. A direction connecting the other end connection point to the load plate member and the center point of the load plate member and the other end connection point to the load plate member. The base plate member is composed of a lower plate and an outer frame provided around the lower plate, and the load plate member described above is disposed on the lower plate. The upper plate is configured to be movable, and the loading plate is provided on the upper plate and faces the outer frame, and the upper plate is at least one of the sliding member and the rolling member on the lower plate. On the other hand, between the outer frame and the load plate facing the outer frame, at least one of a sliding member and a rolling member that can support the load plate moved by earthquake motion This is configured to be movable. Thereby, the direction connecting the one end connection point to the base plate member of the elastic member and the other end connection point to the load plate member, and the center point of the load plate member and the load plate member to the load plate member. Since the angle formed with the direction connecting the other end connection point is 10 degrees or more and 90 degrees or less, the elastic member is connected to one end without matching the expansion / contraction direction of the elastic member and the movement direction of the loading plate member at the time of earthquake. It can be attached between the point and the other end connection point, and even when the seismic vibration resonates with the natural frequency of the elastic member, the vibrations of the resonated elastic body are prevented from being amplified by canceling each other's vibration. be able to.
In addition, the elastic member can be attached between the one end connection point and the other end connection point without matching the expansion / contraction direction of the elastic member and the movement direction of the loading plate member at the time of the earthquake, and the elastic body is compressed and contracted by the earthquake motion. It is possible to secure a sufficient range of motion by making the space to be made extremely small, and to reduce the size of the seismic isolation device.
Further, the base plate member is composed of a lower plate and an outer frame provided around the lower plate, and the load plate member is placed on the upper plate which is movable on the lower plate and the upper plate. The loading plate is provided and is opposed to the outer frame, and the upper plate is movable on the lower plate via at least one of the sliding member and the rolling member, Since at least one of the sliding member and the rolling member is provided between the outer frame and the load plate facing the outer frame so as to be able to support the load plate that is moved by the earthquake motion, the structure is movable. Depending on the seismic motion, when the loading plate member relatively moves, the lower surface of the loading plate member Even in such a case, friction is reduced by a sliding member or a rolling member between the outer frame and the loading plate, and a desired seismic isolation effect can be obtained by smooth displacement. .

According to the seismic isolation device according to claim 4 of the present invention, the one end connection point of the elastic member to the base plate member is arranged at three positions 120 degrees apart on a concentric circle centering on the center point of the base plate member. On the other hand, the other end connection points to the load plate member described above are provided at three positions 120 degrees apart from the one end connection point on a concentric circle centered on the center point of the load plate member described above. Since the six elastic members are connected between the one end connection point and the other end connection point at each of the three locations, the arrangement of the six elastic members allows the elastic members to extend and contract in the stretching direction. Therefore, even when the earthquake motion resonates with the natural frequency of the elastic member, the amplification of the vibration can be prevented.
In addition, it is possible to suppress resonance by shifting the direction of expansion and contraction of the elastic member and the linear direction connecting the one end connection point of the base plate member and the center point of the loading plate member, but depending on the arrangement and number of elastic members, As shown in FIG. 5 (a), the loading plate member advances when subjected to seismic motion because the elastic member does not coincide with the linear direction connecting the one end connection point of the base plate member and the center point of the loading plate member. It will move in a twisted manner rather than straight in the direction, and the loading plate member will try to rotate. However, by arranging six elastic members equally between the one end connection point and the other end connection point for each of the three locations, as shown in FIG. The loading plate member moves in a straight line in the traveling direction, and the rotation of the loading plate member and the load on the loading plate member can be suppressed. Furthermore, by arranging the elastic members equally on the left and right, it is possible to reduce the burden on each elastic member and to suppress the damage.

According to the seismic isolation device according to claim 5 of the present invention, the one end connection point of the elastic member to the base plate member is arranged at four locations on a concentric circle centered on the center point of the base plate member at intervals of 90 degrees. On the other hand, on the concentric circle centering on the center point of the load plate member described above, the other end connection points to the load plate member described above are provided at four positions 90 degrees apart from the one end connection point. Since each of the eight elastic members is connected between the one end connection point and the other end connection point at four locations, the arrangement of the eight elastic members makes the expansion and contraction directions of the elastic members heavy. Therefore, even when the earthquake motion resonates with the natural frequency of the elastic member, the amplification of the vibration can be prevented.
Further, when the eight elastic members are arranged equally between the one end connecting point and the other end connecting point in four places, the loading plate member moves in a straight line in the traveling direction without being twisted by the opposing elastic member, The loading plate member and the load on the loading plate member can be prevented from rotating. Furthermore, by arranging the elastic members equally on the left and right, it is possible to reduce the burden on each elastic member and to suppress the damage.

According to the seismic isolation device according to claim 6 of the present invention, the base plate member and the load plate member described above are each configured in a circular shape, so that the outer shape is a disc-shaped seismic isolation device. In particular, in combination with claim 3, it is possible to prevent the expansion and contraction directions of the elastic members from overlapping, thereby preventing vibration amplification even when the earthquake motion resonates with the natural frequency of the elastic member. be able to.
In addition, the elastic member is compressed by the earthquake motion by attaching the elastic member between the one end connection point and the other end connection point without matching the expansion / contraction direction of the elastic member and the moving direction of the loading plate member at the time of earthquake. The space can be made very small and a sufficient range of motion can be secured, and the seismic isolation device can be miniaturized.

According to the seismic isolation device according to claim 7 of the present invention, the base plate member and the load plate member described above are each formed in a quadrangular shape, so that the outer shape can be a quadrangular seismic isolation device. In particular, by combining with the fourth aspect, the one end connection point is set to four corners, and the other end connection point is set to the middle point of each piece, so that the expansion and contraction directions of the elastic members can be prevented from overlapping. Thereby, even when the earthquake motion resonates with the natural frequency of the elastic member, the amplification of the vibration can be prevented.
In addition, the elastic member is compressed by the earthquake motion by attaching the elastic member between the one end connection point and the other end connection point without matching the expansion / contraction direction of the elastic member and the moving direction of the loading plate member at the time of earthquake. The space can be made very small and a sufficient range of motion can be secured, and the seismic isolation device can be miniaturized.

According to the seismic isolation device according to claim 8 of the present invention, at least one of the one end connection point of the elastic member to the base plate member and the other end connection point of the load plate member is spaced. Since it is provided open, when at least two elastic members are connected to each one end connection point and the other end connection point, the connection points of the two elastic members are installed at intervals, The expansion / contraction direction of the elastic member and the moving direction of the loading plate member can be made not to coincide with each other, and the degree of freedom in the installation direction of the elastic member can be improved.

According to the seismic isolation device of the ninth aspect of the present invention, the load applied to the load plate member is less than 10 kg, the elastic member is constituted by a coil spring, and the spring constant is 0.0015 or more and 0.0040 N / and the other end connection point of the elastic member to the load plate member is configured to be movable 16 cm or more on the base plate member. Therefore, if the loaded load is less than 10 kg, the elastic member If the spring constant of the coil spring is within this range and the movable distance is 16 cm or more, seismic isolation can be performed more effectively and reliably.
In addition, the seismic isolation device can be reduced in size by securing a necessary moving distance.

According to the seismic isolation device of the tenth aspect of the present invention, the load applied to the load plate member is 10 kg or more and 50 kg or less, the elastic member is constituted by a coil spring, and the spring constant is 0.0020 or more and 0.00. 0060 N / mm or less, and the other end connecting point of the elastic member to the load plate member is configured to be movable 20 cm or more on the base plate member. Therefore, if the loaded load is 10 kg or more and 50 kg or less By making the spring constant of the coil spring as the elastic member within this range and making the movable distance 20 cm or more, it is possible to perform seismic isolation more effectively and reliably.
In addition, the seismic isolation device can be reduced in size by securing a necessary moving distance.

According to the seismic isolation device of the eleventh aspect of the present invention, the seismic isolation device according to any one of the first to tenth aspects is provided as a single unit, on the load plate member described before a plurality of the units. , since it is configured one loading material to be placed, can it to stably supported even when the mounting load is large. Further, by changing the number of units, the degree of freedom with respect to the size of the load can be increased.

It is sectional drawing which concerns on one Embodiment of the seismic isolation apparatus of this invention. It is the schematic plan view which abbreviate | omitted one part which concerns on one Embodiment of the seismic isolation apparatus of this invention. It is the schematic plan view which abbreviate | omitted one part which concerns on other one Embodiment of the seismic isolation apparatus of this invention. It is based on the acceleration test result which concerns on one Embodiment of the seismic isolation apparatus of this invention, (a) is a graph of a X-axis direction, (b) is a graph of a Y-axis direction. It is the schematic plan view which concerns on one Embodiment of the seismic isolation apparatus of this invention, and the schematic plan view of the prior art example compared. It is sectional drawing which concerns on other one Embodiment of the seismic isolation apparatus of this invention. It depends on the acceleration test result of the conventional seismic isolation device, (a) is a graph in the X-axis direction, (b) is a graph in the Y-axis direction. It is sectional drawing and schematic plan view of the conventional seismic isolation apparatus.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
The seismic isolation device 10 of the present invention is a device used for seismic isolation of a load such as a small and light device, and the base is isolated for a weight of 10 kg or less, even if it is heavy, 50 kg or less. It is suitable for. In principle, the seismic isolation device of the present invention does not limit the amount of load.

  The seismic isolation device 10 is movable on at least one of a sliding member and a rolling member on the base plate member 11 placed on a floor or the like, and placed on a base or the like. A loading plate member 12 and a plurality of elastic members 13 connected between the base plate member 11 and the loading plate member 12, and one end connection point 13a of the elastic member 13 to the base plate member 11; The other end connection point 13b of the elastic member 13 to the loading plate member 12 is shifted and connected to the linear direction A connecting the center point O of the loading plate member 12. That is, the expansion / contraction direction B of the elastic member 13 connecting the connection points 13a and 13b of the elastic member 13 and the linear direction (loading) connecting the center point O of the loading plate member 12 and the one end connection point 13a of the elastic member 13 on the base plate member 11 side. Corresponding to the radial direction from the center point O of the plate member 12) A is connected so that it does not coincide with A.

The base plate member 11 of the seismic isolation device 10 is fixedly installed on a floor surface or placed on a stand or the like, and includes a bottom plate 11a having a disk shape and an outer frame 11b on the outer periphery thereof, for example, with a bottom. It is configured in a cylindrical shape.
On the lower plate 11a of the base plate member 11, a loading plate member 12 is disposed concentrically with the center point O as the center. The loading plate member 12 includes an upper plate 12a projecting downward from the center and a loading plate 12b integrated with the upper plate 12a. The upper plate 12a is formed to have a smaller diameter than the lower plate 11a. The loading plate 12b is formed to have substantially the same diameter as the lower plate 11a. On the loading plate 12b, a load such as a device is placed. In the seismic isolation device 10, a plurality of, for example, three or four spherical rotating bodies 14 a are attached as rolling members 14 to the lower surface of the upper plate 12 a via support frames 14 b.
As a result, the loading plate member 12 can move in a frictional state by rolling in an arbitrary direction via the spherical rotating body 14a on the lower plate 11a of the base plate member 11 until the upper plate 12a hits the outer frame 11b. It constitutes so-called rolling seismic isolation.

In this embodiment, the base plate member 11 itself is made of a low friction member, or a disk-like friction reducing member 15 is attached on the lower plate 11a of the base plate member 11 to reduce the friction. The body 14a can roll more smoothly.
In this case, the surface roughness of the friction reducing member 15 is selected so that the spherical rotating body 14a can roll without slipping.

  For example, six tension coil springs are connected as the elastic member 13 between the base plate member 11 and the loading plate member 12 which is movable on the base plate member 11 via the rolling member 14. Yes. For this reason, three end connection portions 16a are provided on the outer frame 11b of the base plate member 11 as spring connection portions 16 at equal intervals in the circumferential direction, and two at each of the one end connection portions 16a at intervals of 120 degrees. One end of each elastic member 13 is connected to constitute one end connection point 13a. On the other hand, on the outer periphery of the upper plate 12a of the loading plate member 12, three other end connecting portions 16b at 120 intervals, which are shifted from the one end connecting portion 16a by 60 degrees, are provided as the spring connecting portions 16. The other end of the two elastic members 13 is connected to 16b to form the other end connection point 13b.

  Therefore, in the seismic isolation device 10, the six elastic members 13 are connected between the one end connection point 13 a of the base plate member 11 and the other end connection point 13 b of the loading plate member 12, and the base plate member 11 is attached to the base plate member 11. While holding at the center of the seismic isolation device 10 (returning to the origin), it absorbs the energy at the time of the earthquake and reduces the response acceleration.

Moreover, in this seismic isolation device 10, the elastic member 13 is connected between one end connection point 13a at an interval of 120 degrees and three other end connection points 13b at 120 intervals shifted by 60 degrees from the one end connection point 13a. It is connected. Thereby, the expansion / contraction direction B of the elastic member 13 is a direction connecting the one end connection point 13a and the other end connection point 13b, and is a linear direction A connecting the center point O of the loading plate member 12 and the one end connection point 13a. The radial direction is shifted from a certain center point O. Therefore, the expansion / contraction direction B of each elastic member 13 does not overlap with the linear direction A, and even when the earthquake motion resonates with the natural frequency of the spring of the elastic member 13, it is possible to prevent vibration amplification by the elastic members 13. it can.
Further, for example, as shown in FIG. 5B, the expansion / contraction direction B of the elastic member 13 and the linear direction A connecting the one end connection point 13a of the base plate member 11 and the center point O of the loading plate member 12 are shifted. Thus, even if the direction D of the earthquake motion coincides with the radial direction of the center point O of the loading plate member 12, the elastic member 13 is prevented from restricting the movable range of the loading plate member 12, and the sufficient movable range (loading plate) The movement range of the member 12) can be ensured. Thus, unlike the case where the movable range of the base plate 3 is limited by the elastic body 4 itself due to the arrangement of the conventional elastic body 4 shown in FIG. 10 can be reduced in size.
Further, by shifting the expansion / contraction direction of the elastic member 13 and the linear direction A connecting the one end connection point 13a of the base plate member 11 and the center point O of the loading plate member 12, resonance can be suppressed. Depending on the arrangement and the number, the expansion / contraction direction B of the elastic member 13 and the linear direction A connecting the one end connection point 13a of the base plate member 11 and the center point O of the loading plate member 12 do not coincide as shown in FIG. As a result, when receiving the earthquake motion, the loading plate member 12 moves so as to be twisted rather than straight in the traveling direction, and the loading plate member 12 tries to rotate. However, by disposing six elastic members 13 equally between the one end connecting point 13a and the other end connecting point 13b for each of the three locations, as shown in FIG. Thus, the loading plate member 12 moves in a straight line in the traveling direction without being twisted, and rotation of the loading plate member 12 and the loading on the loading plate member 12 can be suppressed. Further, by arranging the elastic members 13 equally on the left and right, the burden on each elastic member 13 can be reduced, and there is an effect that damage is suppressed.

By shifting the expansion / contraction direction B of the elastic member 13 and the radial direction A connecting the one end connection point 13a which is the connection point outside the elastic member 13 from the center point O of the loading plate member 12, the seismic motion Even when the elastic member 13 resonates with the natural frequency of the spring of the elastic member 13, the effect that the amplification of vibrations by the elastic members 13 can be prevented is that a larger deviation amount between the expansion / contraction direction B and the radial direction A is desired. better not. In other words , the angle C () between the direction connecting the center point O of the loading plate member 12 and the other end connection point 13b that is the connection point of the loading plate member 12 of the elastic member 13 and the expansion / contraction direction B of the elastic member 13. The larger one ( see FIG. 2) is desirable, and 10 degrees or more and 90 degrees or less are desirable. Even in such an angle range, it is necessary to prevent the expansion / contraction direction B between the elastic members 13 from overlapping.

In the seismic isolation device 10 configured as described above, the loading plate member 12 can be freely moved by the input earthquake motion, and the elastic plate 13 mainly pushes the side surface of the upper plate 12a of the loading plate member 12 by applying a biasing force. Although it moves in the pulling direction, the probability of overlapping with the expansion / contraction direction B of the elastic member 13 is very small.
Even if the moving direction of the loading plate member 12 (the base plate member 11 relatively moves in the event of an earthquake) may move in the expansion / contraction direction B of one elastic member 13, another elastic member 13 may be moved. Therefore, in the case of resonance with the natural vibration of the spring, it is possible to suppress the mutual vibration frequency from being canceled and amplifying the vibration.

The effect of connecting the elastic member 13 between the base plate member 11 and the loading plate member 12 by shifting the expansion / contraction direction B of the elastic member 13 from the radial direction A with respect to the center point O of the loading plate member 12 is as follows. In the case where the base plate member 11 and the loading plate member 12 of the seismic isolation device 10 are formed in a concentric circular shape, and the one end connection point 13a and the other end connection point 13b of the elastic member 13 are provided at intervals of 120 degrees. The effect is not limited to this, and the same configuration of the elastic member 13 is effective.
In this case, the outer shape of the base plate member 11 and the loading plate member 12 of the seismic isolation device 10 is not limited in any way, and the expansion / contraction direction B of the elastic member 13 and the radial direction A from the center point O of the loading plate member 12 Are not required, and the loading plate member 12 may be configured to be stationary with respect to the base plate member 11 with respect to the base plate member 11 by the elastic member 13 in a state where seismic motion or the like is not applied.
For example, as shown in FIG. 5A, three elastic members 13 are used, and in the state where the elastic force by the elastic members 13 does not act (stationary state), the expansion / contraction direction B of the elastic members 13 is set to the loading plate member 12. The seismic isolation device 10 is configured by connecting the three one end connecting portions 13a of the base plate member 11 and the three other end connecting portions 13b of the loading plate member 12 with a deviation from the radial direction A with respect to the center point O. be able to.
As already described, the seismic isolation device 10 as described above has effects such as a sufficient securing of the movable range of the loading plate member 12 in addition to the attenuation of seismic vibration energy and suppression of resonance. Moreover, when securing the same range of motion, the seismic isolation device 10 can be downsized.

Further, as shown in FIG. 3, the seismic isolation device 10 </ b> A has a base plate member 11 </ b> A and a loading plate member 12 </ b> A formed in a quadrangular shape, and the corners of the base plate member 11 </ b> A are spaced by 90 degrees with one end connection point 13 a of the elastic member 13. The other end connection points 13b are provided at four locations at intervals of 90 degrees shifted by 45 degrees with respect to the radial direction A from the center point O of the rectangular loading plate member 12 arranged in a similar manner. Is. In the seismic isolation device 10A of the illustrated example, the other end connection points 13b of the elastic member 13 are provided at a total of eight places, two places each shifted from the midpoint of each side of the rectangular loading plate member 12A.
Eight elastic members 13 are connected between four one-end connection points 13a of the base plate member 11A and two other-end connection points 13b on each side of the loading plate member 12A.

In the seismic isolation device 10A configured as described above, the loading plate member 12A can be freely moved by the inputted earthquake motion, and the elastic member 13 mainly pushes the side surface of the upper plate 12Aa of the loading plate member 12A by applying a biasing force. Although it moves in the pulling direction, the probability of overlapping with the expansion / contraction direction B of the elastic member 13 is very small.
Even if the loading plate member 12A (the base plate member 11A relatively moves in the event of an earthquake) may move in the expansion / contraction direction B of one elastic member 13, the expansion / contraction direction of the other elastic member 13 Since it does not overlap with B, when it resonates with the natural vibration of the spring, it is possible to suppress the mutual vibration frequency from being canceled and amplifying the vibration.
In this case, the outer shape of the base plate member 11 </ b> A and the loading plate member 12 </ b> A of the seismic isolation device 10 </ b> A is not limited at all, and the expansion / contraction direction B of the elastic member 13 and the radial direction A from the center point O of the loading plate member 12. And the base plate member 11A may be configured such that the loading plate member 12A is stationary with respect to the base plate member 11A with respect to the base plate member 11A without any seismic motion. It may be a case where the loading plate member 12 is formed in a circular shape.
Moreover, as already explained, the expansion / contraction direction B of the elastic member 13 and the linear direction A connecting the one end connection point 13a of the base plate member 11A and the center point O of the loading plate member 12A are shifted. Even if the direction D coincides with the radial direction of the center O of the loading plate member 12A, the elastic member 13 is prevented from restricting the movable range of the loading plate member 12A, and a sufficient movable range (movement range of the loading plate member 12A). Can be secured. Thus, unlike the case where the movable range of the base plate 3 is limited by the elastic body 4 itself due to the arrangement of the conventional elastic body 4 shown in FIG. 10A can be reduced in size.
Further, when the eight elastic members 13 are arranged equally between the four one-end connecting points 13a and the other-end connecting points 13b, the loading plate member 12A moves in the traveling direction without being twisted by the opposing elastic members 13. It moves to a straight line, and rotation of the loading plate member 12A and the loading material on the loading plate member 12A can be suppressed. Further, by arranging the elastic members 13 equally on the left and right, the burden on each elastic member 13 can be reduced, and there is an effect that damage is suppressed.

In such seismic isolation devices 10 and 10A, in order to make the seismic isolation effect due to the arrangement of the elastic member 13 more effective, the elastic member 13 having an appropriate spring constant k with respect to the load applied to the loading plate members 12 and 12A. It is necessary to choose.
For example, in the case where the elastic member 13 in the case of the seismic isolation device 10 is provided and configured, and the loading amount of the loading plate member 12 is less than 10 kg, the spring constant k is 0.0015 or more and 0.0040 N / mm. The following is preferable.
In addition, when the loading amount on the loading plate member 12 is 10 kg or more and 50 kg or less, the spring constant k of the elastic member 13 is preferably 0.0020 or more and 0.0060 N / mm or less.

Also, the loading plate member 12 (the upper plate 12a of the loading plate member 12) connected by the elastic member 13 is on the base plate member 11 until the other end connection point 13b on the loading plate member 12 side contacts the outer frame 11b. However, when the loaded load is less than 10 kg, the moving distance is configured to be movable 16 cm or more on the base plate member 11 (8 cm to the left and right since it moves to the left and right). Preferably, when the loaded load is 10 kg or more and 50 kg or less, the other end connection point 13b of the elastic member 13 is configured to be movable 20 cm or more on the base plate member (10 cm to the left and right respectively). desirable.
In order to secure such a moving distance of the loading plate member 12, it is necessary to secure a space for the elastic member 13 that is compressed and contracted with the movement. In the seismic isolation device 10 (10 </ b> A), the elastic member 13 Since the expansion / contraction direction B and the moving direction A of the loading plate member 12 are shifted, it is not necessary to secure the expansion / contraction space of the elastic member 13, and the seismic isolation device 10 (10A) can be downsized.

  Furthermore, in the seismic isolation device 10 (10A), the base plate member 11 itself is segregated by rolling the rolling member 14 in an arbitrary direction on the lower plate 11a of the base plate member 11 to ensure the seismic isolation effect. It is preferable that the friction reducing member 15 is mounted on the lower plate 11a so that the roller can be smoothly rolled by reducing rolling friction.

As the friction reducing member 15, a fluorine resin material such as an acrylic resin material or PTFE (polytetrafluoroethylene) is most preferable because it has a low friction coefficient, but polyethylene or other low friction coefficient materials can also be used. Further, it is more preferable that the friction reducing member 15 is provided with unevenness even in a flat planar shape so as to reduce the contact area with the lower plate 11a and the like with respect to the entire area of the lower plate 11a.
Note that the friction reducing member 15 is not limited to the case where a sheet-like member is attached on the lower plate 11a, and the friction reducing member 15 can be formed by applying the above-described coating material on the lower plate 11a.
When the friction reducing member 15 is provided on the lower plate 11a to roll the rolling member 14 in an arbitrary direction, if the friction with the friction reducing member 15 is too small, the rolling member 14 does not roll. It will slip and the rolling effect will not be obtained.
In the case of rolling seismic isolation using the rolling member 14, there is an appropriate range of friction, and for example, the surface roughness (Ra) is preferably 0.01 to 0.1 μm.
Furthermore, the base plate member 11 including the friction reducing member 15 needs to have a hardness that allows the rolling member 14 and the like to smoothly roll even when a load is applied. Although the hardness of the surface of the base plate member 11 including the friction reducing member 15 varies depending on the size of the sphere of the rolling member 14, for example, the Asker A hardness is preferably 50 or more.

In the above-described embodiment, the base plate member 11 is isolated from the base plate member 11 by rolling with the spherical rotating body 14a constituting the rolling member 14 attached to the upper plate 12a of the loading plate member 12. Instead of the rolling member 14, a sliding member having a low friction surface may be used, and the sliding surface may be slid by sliding on the friction reducing member 15 of the lower plate 11 a, and the structure may be configured to be seismically isolated by sliding. it can. The elastic member 13 is connected to the elastic member 13 between the one end connecting point 13a and the other end connecting point 13b by shifting the expansion / contraction direction B of the elastic member 13 and the radial direction A with respect to the center point O of the loading plate member 12. 13 is connected.
Even when the sliding surfaces of such sliding members are in contact with each other by sliding, it is possible to prevent the vibrations from canceling each other and amplifying the vibration when resonating with the natural vibration of the spring. it can. Furthermore, as already described with the seismic isolation device 10 as described above, in addition to the attenuation of the energy of the seismic motion, there are effects such as sufficient securing of the movable range of the loading plate member 12. Moreover, when securing the same range of motion, the seismic isolation device 10 can be downsized.

Next, another embodiment of the seismic isolation device of the present invention will be described with reference to FIG. In addition, the same code | symbol is described to the same part as already demonstrated seismic isolation apparatus 10 and 10A, and the overlapping description is abbreviate | omitted.
In the seismic isolation device 10B, it is assumed that the ground motion is not only applied in parallel to the front and back surfaces of the base plate member 11 and the loading plate member 12, but also when the base plate member 11 and the loading plate member 12 are relatively inclined. Even in such a case, a sliding member 17 is provided on the upper surface of the outer frame 11b of the base plate member 11 so that the base plate member 11 and the loading plate member 12 can move smoothly by rolling or sliding, and the upper plate 12a of the loading plate member 12 is provided. It is configured so as to be in surface contact with a loading plate 12b which is mounted on the loading plate 12b.
The other configurations are the same as those of the already described seismic isolation devices 10 and 10A.
According to the seismic isolation device 10B configured in this way, in addition to the attenuation of seismic vibration energy and the suppression of resonance similar to the already described seismic isolation devices 10 and 10A, sufficient securing of the movable range of the loading plate member 12, etc. It will be effective. Moreover, when securing the same range of motion, the seismic isolation device 10 can be downsized.
Furthermore, in addition to these effects, even when the loading plate member 12 and the base plate member 11 move relative to each other due to earthquake motion, even if the loading plate member 12 may come into contact with the base plate member 11, it is provided on the outer frame 11b. The loaded plate 12b can be smoothly moved by the sliding member 17.
Thereby, a desired seismic isolation effect can be obtained regardless of the direction of the earthquake motion.
A spherical rotating body (rolling member) may be provided instead of the sliding member 17. The outer frame 11b is made of a material having a low friction coefficient, and the outer frame 11b is also used as a sliding member, or a material having a low friction coefficient is applied to the upper surface of the outer frame 11b. May be.

The seismic isolation device of the present invention comprises a base isolation member 10 (10A) composed of a base plate member 11, a loading plate member 12, and an elastic member 13 disposed therebetween as a single unit. It can be configured as a seismic isolation device with a unit. In this seismic isolation device, a single load is placed on the loading plate member 12 of a plurality of units.
For example, when the loaded luggage has a large square shape, the four units (the seismic isolation devices 10 and 10A) are arranged at the four corners of the loaded luggage so that the loaded luggage can be stably supported and sufficient. Seismic isolation effect is obtained.
Note that the number of units used as the seismic isolation device is not limited to the case of four units, but may be two or more, and may be determined according to the projected area and weight of the load on the plane.

Below, the Example of the seismic isolation apparatus of this invention is described with a comparative example.
[Example 1]
A lower plate 11a made of wood having a diameter of 350 mm was prepared as the base plate member 11, and wood processed into a ring shape having an outer diameter of 350 mm and an inner diameter of 320 mm was joined and attached to the lower plate 11a as the outer frame 11b. One end connection points 13a of the elastic members 13 are provided at intervals of 120 degrees inside the outer frame 11b of the base plate member 11.
A loading plate 12b made of a circular stainless steel plate having a diameter of 350 mm was prepared as the loading plate member 12, and a rubber sheet was attached to the upper surface to prevent the loaded load from slipping. An upper plate 12a having a diameter of 100 mm was attached to the lower surface of the loading plate 12b with screws. Three free ball bearings having a ball diameter of 15 mm were attached as rolling members 14 to the lower surface of the upper plate 12a. Further, the other end connection points 13b of the elastic members 13 at three positions are provided on the side surface of the upper plate 12a at intervals of 120 degrees.
As the elastic member 13, six tension coil springs having a length of 75 mm and a spring constant k of 0.0031 N / mm were prepared. In the examples, three pieces having a length of 150 mm were prepared and used. Three tension coil springs with a length of 150 mm are connected between three end connection points 13a on the inner side of the outer frame 11b of the base plate member 11 so as to be arranged in an equilateral triangle and then loaded with an intermediate portion. The plate member 12 was connected to three other end connection points 13b of the upper plate 12a.
Accordingly, the three tension coil springs are shifted from the six tension coil springs by 60 degrees between the one end connection points 13 a at intervals of 120 degrees inside the outer frame 11 b of the base plate member 11 and the upper plate 12 a of the loading plate member 12. In the state where it is the same function as the state connected to the other end connection point 13b with an interval of 120 degrees, the expansion / contraction direction B of the tension coil spring and the radial direction A with respect to the center point O of the loading plate member 12 are shifted, The base plate member 11 and the loading plate member 12 are stationary at the origin.
In this case, the movable range of the upper plate 12a of the loading plate member 12 inside the outer frame 11b of the base plate member 11 is 11 cm on each of the left and right sides, and a total movable range of 20 cm or more is secured.
Seismic Isolation Test The above seismic isolation device was fixed on a table of a biaxial vibration testing machine, and a weight of 20 kg (loading amount) was placed on the loading plate member 12.
An acceleration sensor was mounted on the loading plate member 12 in two directions, X and Y, orthogonal to each other.
The shaking table was vibrated with an input acceleration equivalent to the Hyogo-Nanbu Earthquake, and the response acceleration was measured with an acceleration sensor. The measurement results are shown in Table 1 and FIG.
As shown in Table 1, the vibration test result according to Example 1 shows that the maximum response acceleration is suppressed to 11% of the maximum input acceleration in both the X-axis and Y-axis directions, and the input acceleration is amplified by the resonance of the spring. It shows no.
Thereby, in this seismic isolation device, the spring resonates due to the vibration caused by the earthquake, and the seismic isolation cycle can be lengthened without amplifying the vibration.
In addition, the input acceleration can be reduced from a large-scale earthquake to a small-scale earthquake, and the load can be reliably protected.

[Comparative Example 1]
The same base plate member and loading plate member as in Example 1 are prepared, and four tension coil springs having the same specifications (length 75 mm and spring constant k of 0.0031 N / mm) are prepared as elastic members. did.
Four tension coil springs are connected at four points 90 ° apart from one end connection point 13a inside the outer frame 11b of the base plate member 11 at four locations 90 ° apart from each other and the upper plate 12 of the loading plate member 12 facing this. It connected between the other end connection point 13b.
In this state, the expansion / contraction direction B of the tension coil spring coincides with the radial direction A with respect to the center point O of the loading plate member 12, and the base plate member 11 and the loading plate member 12 are stationary at the origin. ing.
Using this seismic isolation device, seismic isolation tests were performed under the same conditions as in the Examples, and the results are shown in Table 2 and FIG.
As shown in Table 2, the vibration test result of Comparative Example 1 shows that the maximum response acceleration is about 28% to 42% of the maximum input acceleration, and the vibration absorption effect is greater than that of the seismic isolation device having the configuration of Example 1. Inferior, partially suggesting the possibility of amplification by spring resonance.

10 base isolation device 11 base plate member 11a lower plate 11b outer frame 12 loading plate member 12a upper plate 12b loading plate 13 elastic member (tensile coil spring)
13a One end connecting point 13b Other end connecting point 14 Rolling member 14a Spherical rotating body 14b Support frame 15 Friction reducing member (fluorine sheet)
16 Spring connecting portion 16a One end connecting portion 16b Other end connecting portion 11A Base plate member 12A Loading plate member 12Aa Upper plate 12Ab Loading plate 10A Seismic isolation device 10B Seismic isolation device 17 Sliding member A Linear direction (radial direction)
B Stretching direction C Angle D Direction of earthquake motion O Center point (return origin)

Claims (11)

A base-isolated seismic isolation system in which a loading plate member is movable through at least one of a sliding member and a rolling member, and a plurality of elastic members are connected between the base plate member and the loading plate member. A device,
Expansion and contraction of the elastic member by shifting the other end connection point of the elastic member to the load plate member described above with respect to a linear direction connecting one end connection point of the elastic member to the base plate member and the center point of the load plate member described above. A direction in which the direction and the linear direction are connected without matching, and a direction connecting the one end connection point of the elastic member to the base plate member and the other end connection point to the load plate member, and the load plate described above The angle formed between the center point of the member and the direction connecting the other end connection point to the load plate member is 10 degrees or more and 90 degrees or less, and the expansion and contraction directions of the elastic members do not overlap. Seismic isolation device.   A base-isolated seismic isolation system in which a loading plate member is movable through at least one of a sliding member and a rolling member, and a plurality of elastic members are connected between the base plate member and the loading plate member. A device,
  Expansion and contraction of the elastic member by shifting the other end connection point of the elastic member to the load plate member described above with respect to a linear direction connecting one end connection point of the elastic member to the base plate member and the center point of the load plate member described above. Connecting and arranging the direction and the linear direction without matching,
  The base plate member is composed of a lower plate and an outer frame provided around the lower plate,
The load plate member described above includes an upper plate that is movable on the lower plate, and a load plate that is provided on the upper plate and faces the outer frame,
  While the upper plate is movable on the lower plate via at least one of the sliding member and the rolling member,
  Between the outer frame and the above-described load plate facing the outer frame, at least one of a sliding member and a rolling member that can support the load plate that moves by earthquake motion is provided and configured to be movable. A seismic isolation device characterized by A base-isolated seismic isolation system in which a loading plate member is movable through at least one of a sliding member and a rolling member, and a plurality of elastic members are connected between the base plate member and the loading plate member. A device,
Expansion and contraction of the elastic member by shifting the other end connection point of the elastic member to the load plate member described above with respect to a linear direction connecting one end connection point of the elastic member to the base plate member and the center point of the load plate member described above. A direction in which the direction and the linear direction are connected without matching, and a direction connecting the one end connection point of the elastic member to the base plate member and the other end connection point to the load plate member, and the load plate described above The angle formed by the direction connecting the center point of the member and the other end connection point to the load plate member is 10 degrees or more and 90 degrees or less ,
The base plate member is composed of a lower plate and an outer frame provided around the lower plate,
The load plate member described above includes an upper plate that is movable on the lower plate, and a load plate that is provided on the upper plate and faces the outer frame,
While the upper plate is movable on the lower plate via at least one of the sliding member and the rolling member,
Between the outer frame and the above-described load plate facing the outer frame, at least one of a sliding member and a rolling member that can support the load plate that moves by earthquake motion is provided and configured to be movable. seismic Isolation device characterized by comprising. The one end connection point of the elastic member to the base plate member is provided at three positions at 120 degree intervals on a concentric circle centered on the center point of the base plate member, while the center point of the load plate member is centered. On the concentric circles, the other end connection points to the load plate member described above are provided at three positions at 120 degree intervals shifted from the one end connection point by 60 degrees, and each of the one end connection point and the other end connection point at these three positions. The seismic isolation device according to any one of claims 1 to 3 , wherein six elastic members are connected to each other . The one end connection point of the elastic member to the base plate member is provided at four positions 90 degrees apart on a concentric circle centered on the center point of the base plate member, while the center point of the load plate member is centered on the center point. On the concentric circles, the other end connection points to the load plate member described above are provided at four positions 90 degrees apart from the one end connection points by 45 degrees, and each of the four one end connection points and the other end connection points is provided. The seismic isolation device according to any one of claims 1 to 3 , wherein the eight elastic members are connected to each other . Seismic isolation device according to any one of claims 1 to 5, characterized in that the said loading plate member and the base plate member, comprising each configured in a circular shape. The seismic isolation device according to any one of claims 1 to 5 , wherein each of the base plate member and the load plate member is configured in a quadrangular shape. And one end point of connection to the base plate member of the elastic member, according to claim 1-7, characterized by comprising spaced apart at least one of said other end connection point to said loading plate member The seismic isolation device according to any one of the above. The load applied to the load plate member is less than 10 kg, the elastic member is formed of a coil spring, and the spring constant is 0.0015 or more and 0.0040 N / mm or less. The seismic isolation device according to any one of claims 1 to 8 , wherein the other end connection point is configured to be movable 16 cm or more on the base plate member. The load applied to the load plate member is 10 kg or more and 50 kg or less, the elastic member is formed of a coil spring, the spring constant is 0.0020 or more and 0.0060 N / mm or less, and the elasticity to the load plate member is The seismic isolation device according to any one of claims 1 to 8 , wherein the other end connection point of the member is configured to be movable 20 cm or more on the base plate member. The seismic isolation device according to any one of claims 1 to 10 is provided as a unit, and a single load can be placed on the load plate member of the plurality of units. Seismic isolation device.