JP2004052992A - Base isolation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base isolation device capable of absorbing shock of a vertical direction and coping with vibration of all directions for a structure having a long span such as a bridge with a simple structure. <P>SOLUTION: This base isolation device has an upper side member 3 fixed to an upper structure 1, a lower side member 4 supported by a foundation member 2, a rolling member 5 interposed between the upper side member 3 and the lower side member 4, and an attitude holding means of the rolling member 5. An abutting surface of the upper side member 3, the lower side member 4 and the rolling member 5 is formed into a curved surface. The rolling member 5 is formed into a ball-shape having a substantially elliptical shape in cross section. A first abutting surface abutted with the upper side member 3 and the rolling member 5 thereon and a second abutting surface abutted with the lower side member 4 and the rolling member 5 thereon have structures different in perpendicular position. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a seismic isolation device that is interposed between a building and a foundation member to protect the building from an earthquake.
[0002]
[Prior art]
In recent years, seismic isolation devices have been actively used to protect structures such as buildings and bridges from vibrations such as earthquakes. In most cases, the seismic isolation device absorbs the vibration by the elastic force of the rubber or the spring by supporting the building via the rubber or the spring. However, since rubber and springs deteriorate relatively quickly, they are not always suitable as seismic isolation devices used for buildings that are assumed to be used for a long period of time. Also, supporting a large load requires a considerable increase in size and limitations, and a large number of seismic isolation devices are required to distribute and support the large load.
[0003]
Therefore, as means for solving this problem, there has been a seismic isolation device as disclosed in Japanese Patent Application Laid-Open No. 10-61250. In this seismic isolation device, two support members each having a concave surface having a cross-sectional shape that is bilaterally symmetric when viewed from one direction and has a deepest central portion and a large gradient on the outside are arranged vertically with the concave surfaces facing each other. An earthquake-resistant unit is constructed by stacking one cylindrical roller horizontally arranged along the above-mentioned viewing direction with the roller interposed between the concave surfaces. Are arranged in two layers vertically.
[0004]
[Problems to be solved by the invention]
However, the conventional seismic isolation device described above effectively exerts the seismic isolation function against lateral shaking and diagonal shaking, but does not respond to vertical instantaneous impacts such as a direct type earthquake. However, it does not function effectively, and the impact of the ground is transmitted to the structure as it is, causing a shock to the structure.
[0005]
Also, in the roll direction, one quake-resistant unit is effective for roll in the direction in which the roller axis is orthogonal, so that the roller axis is orthogonal in the roller axial direction. In such a case, the two parts must be arranged one above the other in the vertical direction, and the structure is complicated and the cost is high.
[0006]
In addition, structures with long spans, such as bridges, require a large number of rollers in the horizontal direction to cope with the long travel distance in the event of an earthquake. There was also a problem that it was costly.
[0007]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional problems, and has a simple structure capable of absorbing a shock in a vertical direction and being able to cope with shaking in all directions with a simple structure even for a structure having a long span such as a bridge. It provides a seismic device.
[0008]
[Means for Solving the Problems]
The seismic isolation device of the present invention includes an upper member fixed to an upper structure, a lower member supported by a base member, and a rolling member interposed between the upper member and the lower member. A seismic isolation device having a posture maintaining means for the rolling member, wherein a contact surface between the upper member and the lower member and the rolling member is formed into a curved surface, and the rolling member has a substantially cross section. The first contact surface, which is formed in an elliptical ball shape and in which the upper member and the rolling member abut, and the second contact surface in which the lower member and the rolling member abut, have different perpendicular positions. It is characterized by the following.
[0009]
Further, the posture maintaining means of the rolling member according to the present invention is a rack which meshes with the involute gear formed on the surface of the rolling member and the involute gear formed on the inner surfaces of the upper member and the lower member. And a resilient member mounted outside the upper member.
[0010]
Further, the posture maintaining means of the rolling member according to the present invention may be characterized in that it comprises a pointing member penetrating the rolling member in a lateral direction, and elastic flanges supporting both sides of the pointing member.
[0011]
Further, the posture maintaining means of the rolling member according to the present invention fixes the supporting member penetrating the rolling member in the axial direction, the detent portions formed at both ends of the supporting member, and the detent portion. It may be characterized by being an elastic fixing member.
[0012]
Also, the seismic isolation device of the present invention includes an upper member fixed to an upper structure, a lower member supported by a base member, and a rolling member interposed between the upper member and the lower member. A contact surface between the upper member and the lower member and the rolling member is formed in a curved surface, and the rolling member is formed in a ball shape having a substantially elliptical cross section. A rack-shaped gear meshing with the involute gear is formed on the inner surface of the upper member and the lower member and the rolling member on the surface together with the involute gear, and the upper member and the rolling member contact the rolling member. The first contact surface and the second contact surface where the lower member and the rolling member contact each other have different perpendicular positions.
[0013]
Further, the seismic isolation device of the present invention includes an upper member fixed to an upper structure, a lower member fixed to a base member, and a rolling member interposed between the upper member and the lower member. A pointing member penetrating the rolling member in the lateral direction, an elastic flange supporting both sides of the pointing member, and elastic members mounted on both sides of the upper member and the lower member. Wherein the contact surface between the upper member and the lower member and the rolling member is formed into a curved surface, the rolling member is formed in a ball shape having a substantially elliptical cross section, and the upper member and the rolling member The first contact surface with which the member contacts and the second contact surface with which the lower member and the rolling member contact with each other may have different perpendicular positions.
[0014]
Further, the seismic isolation device of the present invention includes an upper member fixed to an upper structure, a lower member supported by a base member, and a rolling member interposed between the upper member and the lower member. A support member that penetrates the rolling member in the axial direction, a detent portion formed at an end of the support member, an elastic member that supports the detent portion, the upper member and the lower member. A seismic isolation device having elastic members mounted on both sides of the rolling member, wherein a contact surface between the upper member and the lower member and the rolling member is formed as a curved surface, and the rolling member is a substantially flat spindle. A first contact surface where the upper member and the rolling member are in contact with each other and a second contact surface where the lower member and the rolling member are in contact with each other have different perpendicular positions. You can also.
[0015]
Further, the seismic isolation device of the present invention includes an upper member fixed to an upper structure, a lower member supported by a base member, and a rolling member interposed between the upper member and the lower member. And an elastic member supporting the upper member and the lower member, wherein a contact surface between the upper member and the lower member and the rolling member is formed into a curved surface, The moving member is formed in a sphere having ends which are substantially flat and have linear portions at both ends, and the rolling member and the rolling member are supported until the supporting member of the rolling member comes into contact with the upper member or the lower member. The rolling member operates between the upper member or the lower member by rolling friction, and after the supporting member of the rolling member comes into contact with the upper member or the lower member, the rolling member and the upper member or the lower member. Characterized by sliding friction between side members It is.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of a seismic isolation device according to the present invention will be described with reference to the drawings.
1 is a sectional view showing a first embodiment of a seismic isolation device according to the present invention, FIG. 2 is a side view showing a sectional structure of the seismic isolation device of FIG. 1, and FIG. 3 is an operation of the seismic isolation device of FIG. FIG. 4 is a sectional view showing a second embodiment of the seismic isolation device of the present invention, FIG. 5 is a sectional view showing an operation state of the seismic isolation device of FIG. 4, and FIG. FIG. 7 is a perspective view showing a main part of a third embodiment of the seismic isolation device, FIG. 7 is a side view showing a sectional structure of the seismic isolation device of FIG. 6, and FIG. FIG. 9 is a sectional view showing an operation state of the seismic isolation device of FIG. 6, FIG. 10 is a side view showing a fourth embodiment of the seismic isolation device of the present invention, and FIG. It is a side view which shows an operation state.
[0017]
As shown in FIGS. 1 to 3, a seismic isolation device A according to a first embodiment of the present invention is supported by an upper member 3 fixed to an upper structure 1 and a base member 2. This is a seismic isolation device including a lower member 4, a rolling member 5 interposed between the upper member 3 and the lower member 4, and a posture holding unit for the rolling member 5. This seismic isolation device A is installed between the structure 1 and the foundation member 2 in an appropriate number.
[0018]
In this seismic isolation device A, the contact surface between the upper member 3 and the lower member 4 and the rolling member 5 is formed in a curved surface, and the rolling member 5 is formed in a ball shape having a substantially elliptical cross section. ing. An involute gear 5a is formed on the surface of the rolling member 5, and involute rack gears 3a, 4a meshing with the involute gear 5a are formed on the inner surfaces of the upper member 3 and the lower member 4. Have been. A first contact surface P1 at which the rolling member 5 contacts the upper member 3 and a second contact surface P2 at which the rolling member 5 contacts the lower member 4 roll so that their perpendicular positions are different. The member 5 is held by posture holding means described later.
[0019]
The posture maintaining means of the rolling member 5 includes an involute gear 5a formed on the surface of the rolling member 5, and the rack-shaped gears 3a, 4a formed on the inner surfaces of the upper member 3 and the lower member 4. And the elastic members 6 and 7 mounted on the outside of the upper member 3. That is, as described later, the elastic members 6 and 7 restrict the movement of the upper member 3 and the lower member 4 at the ends of the upper member 3 and the lower member 4 so that the posture of the rolling member 5 is adjusted. Is held. As shown in FIG. 1, elastic members 8 and 9 similar to the elastic members 6 and 7 are also attached to the ends in the front-rear direction in the figure, and a cover member 10 surrounds these elastic members. Is attached.
[0020]
The involute gear 5a formed on the surface of the rolling member 5 and the rack-shaped gears 3a, 4a formed on the upper member 3 and the lower member 4 form the rolling member 5, the upper member 3, and the lower member. 4, the rolling member 5 can freely roll along the inner surfaces of the upper member 3 and the lower member 4. Further, since the rolling member 5 is formed in a ball shape having a substantially elliptical cross section, the rolling member 5 can roll not only in the left-right direction but also in the front-rear direction.
[0021]
The upper member 3, the lower member 4, the rolling member 5, and the cover member 10 are made of an iron-based metal material. The reason why these members are made of an iron-based metal material is to improve the durability of the seismic isolation device. Therefore, the upper member 3, the lower member 4, the rolling member 5, and the cover member 10 are not limited to iron-based metal materials, but use various materials having high rigidity such as a ceramic material or an aluminum alloy. be able to. The contact surfaces of the rolling member 5, the upper member 3 and the lower member 4 can be subjected to a coating process for smoothing the operation. Furthermore, the elastic members 6, 7, 8, 9 use silicon rubber or the like containing a steel belt with increased durability.
[0022]
In the seismic isolation device A thus configured, in the initial state, as shown in FIG. 2, the rolling member 5 and the upper member 3 abut on the first contact surface P1, and the rolling member 5 and the lower member The side member 4 is in contact with the second contact surface P2. Therefore, the perpendicular position of the first contact surface P1 and the perpendicular position of the second contact surface P2 are different. Therefore, in this state, the load F1 acting on the first contact surface P1 from the upper structure 1 is a load that pushes the rolling member 5 downward, but the rolling member 5 meshes with the upper member 3. Therefore, the load F11 moves the upper member 3 rightward in the drawing. Then, the load F11 of the upper member 3 is regulated by the elastic member 6, and the position is disentangled.
[0023]
Similarly, the downward load F1 applied to the rolling member 5 on the first contact surface P1 becomes a clockwise rotational torque F12 on the rolling member 5 in the figure. Therefore, the load on the second contact surface P2 is in the direction opposite to that of the first contact surface P1, and the rotation torque is F22. For this reason, the lower member 4 meshing with the rolling member 5 tries to move to the left under the load F21 in the left direction in the figure, but is restricted by the elastic member 7. That is, since the load in the vertical direction is dispersed into the load in the horizontal direction, apparently there is no direct resistance in the vertical direction, so that the response to a shock in the vertical direction becomes very fast.
[0024]
The seismic isolation device A configured as described above is transmitted to the rolling member 5 by the second abutment blood P2 as shown in FIG. Since an upward load F2 acts on the rolling member 5 and simultaneously generates a clockwise torque F22 'on the rolling member 5 about the second contact surface P2, the rolling member 5 Rolls around. Then, a load F12 'for moving the lower member 4 to the left in the drawing is generated, but the elastic member 6 is deformed to absorb the load F12'. When the rolling member 5 rolls at the same time, a load F11 'is generated on the first contact surface P1 to move the upper member 3 meshed with the rolling member 5 rightward, but the elastic member 6 is deformed. By doing so, the impact load is absorbed.
[0025]
As described above, the seismic isolation device A exhibits an effective seismic isolation function against a shock load in the vertical direction. However, the rolling member 5, the upper member 3, and the lower The relative movement of the member 4 exerts a seismic isolation effect. Further, since the rolling member 5 is formed in a ball shape having a substantially elliptical cross section, and the contact surface with the upper member 3 and the lower member 4 is formed as a curved surface, the seismic isolation device A is provided as a set in the left-right direction. Not only that, it also exerts an effect on forward and backward swinging.
[0026]
Next, FIGS. 4 and 5 show a second embodiment of the seismic isolation device according to the present invention. The seismic isolation device B includes an upper member 11 fixed to the upper structure 1, a lower member 12 fixed to the lower structure 2, and an interposition between the upper member 11 and the lower member 12. Rolling member 13, a pointing member 14 penetrating the rolling member in the lateral direction, and an elasticity interposed between the upper structure 1 and the lower structure 2 to fix both ends of the pointing member. This is a seismic isolation device having members 15 and 16. Further, elastic flanges 17 and 18 serving as a posture holding means of the rolling member 13 are mounted on both sides of the pointing member 14.
[0027]
The contact surfaces 11a, 12a of the upper member 11, the lower member 12, and the rolling member 13 are formed into curved surfaces, and the rolling member 13 is formed in a spherical shape having a substantially elliptical cross section. A first contact surface P3 at which the upper structure contacts the rolling member and a second contact surface P4 at which the lower structure contacts the rolling member have different perpendicular positions. . A gabber member 19 formed integrally with the lower member 12 is attached outside the elastic members 15 and 16.
[0028]
In the seismic isolation device B configured as described above, as shown in FIG. 4, in an initial state, the rolling member 13 and the upper member 11 abut on the first contact surface P3, and the rolling member 13 and the lower member The member 12 is regulated by the pointing member 14 and the elastic members 15 and 16 so as to abut on the second contact surface P4. Therefore, the perpendicular position of the first contact surface P3 and the perpendicular position of the second contact surface P4 are different. Therefore, in this state, the load from the upper structure to the upper member 11 becomes a downward load F3 on the first contact surface P3, and becomes a torque F32 for rotating the rolling member 13 clockwise. This torque F32 is also transmitted to the pointing member 14, and the load F31 pushes down the pointing member 14. However, since the load F31 is regulated by the elastic flange 17, the rolling member 13 holds this posture.
[0029]
Similarly, the torque F32 generated by the rolling member 13 at the first contact surface P3 to rotate the rolling member 13 is equal to the first contact surface P4 at the second contact surface P4 on the opposite side of the rolling member 13. The load becomes the direction opposite to P3, and the rotational torque becomes F42. Therefore, the elastic member 18 acts as an upward stress load F41 on the elastic flange 18 that regulates the pointing member 14, but is absorbed by the elastic flange 18.
[0030]
The seismic isolation device B configured as described above is transmitted to the rolling member 13 through the second contact surface P4 as shown in FIG. An upward load F4 'acts on the rolling member 13, and at the same time, a clockwise torque F42' is generated on the rolling member 13 about the second contact surface P4. Therefore, the upper member 11 that rolls in the clockwise direction on the rolling member 13 and is in contact with the rolling member 13 moves rightward in FIG. Energy is absorbed, impact is reduced and shaking is suppressed.
[0031]
When the rolling member 13 rolls, the pointing member 14 applies an upward load F41 'to the elastic flange 18 and a downward load F31' to the elastic flange 17, but the elastic flange 17 and the elastic flange The deformation of 18 absorbs the impact.
[0032]
Like the seismic isolation device A, the above-described seismic isolation device B exerts an effective seismic isolation function against a shock load in the vertical direction. The relative movement of the upper member 11 and the lower member 12 exerts a seismic isolation effect. Further, the rolling member 13 is formed in a ball shape having a substantially elliptical cross section, and the contact surface with the upper member 11 and the lower member 12 is formed as a curved surface. It is effective not only in the direction but also in the front-back direction.
[0033]
Next, FIGS. 6 to 9 show a third embodiment of a seismic isolation device according to the present invention. This seismic isolation device C is interposed between an upper member 21 fixed to the upper structure 1, a lower member 22 fixed to the base member 2, and the upper member 21 and the lower member 23. A rolling member 23, a supporting member 24 that passes through the rolling member 23 in the axial direction, detent members 25 and 26 formed at ends of the supporting member 24, and an end of the supporting member. The seismic isolation device includes elastic flanges 27 and 28 and elastic members 29 and 30 mounted on both ends of the upper member 21 and the lower member 23.
[0034]
Further, in the seismic isolation device C, the contact surface between the upper member 21 and the lower member 22 and the rolling member 23 is formed in a curved surface, and the diameter of the substantially flat central portion of the rolling member 23 is large. A first contact surface P5, which is formed in a spindle shape and in which the upper member 21 and the rolling member 23 contact, and a second contact surface P6 in which the lower member 22 and the rolling member 23 contact. Are configured to have different perpendicular positions. In order to hold the rolling member 23 in such a posture, posture holding means is provided. The posture holding means includes a support member 24 that penetrates the rolling member 23 in the axial direction, detent portions 25, 25 formed at both ends of the support member 24, and fixes the detent portions 25, 25. The elastic fixing members 27 and 28 are provided.
[0035]
As shown in FIG. 8, the seismic isolation device C configured as described above has the rolling member 23 and the rolling member 23 so that the perpendicular position of the first contact surface and the perpendicular position of the second contact surface are different in the initial state. The upper member 21 abuts on the first contact surface P5, and the rolling member 23 and the lower member 22 abut on the second contact surface P6. I have. That is, since the load in the vertical direction is dispersed into the load in the horizontal direction, apparently there is no direct resistance in the vertical direction, so that the response to a shock in the vertical direction becomes very fast.
[0036]
When the seismic isolation device C configured as described above receives a vertical impact due to, for example, a direct type earthquake, the seismic isolation device C is transmitted to the rolling member 23 by the second contact surface P6 as shown in FIG. An upward load F6 'acts on the rolling member 23, and at the same time, a clockwise torque F62' is generated on the rolling member 23 about the second contact surface P6. Therefore, since the rolling member 23 rolls clockwise, the upper member 21 that is in contact with the rolling member 23 on the first contact surface P5 moves rightward in the figure due to the load F51 ′. By deforming the elastic member 30 by hitting the elastic member 30, the energy is absorbed, the impact is reduced, and the shaking is suppressed.
[0037]
Further, when the rolling member 23 rotates, a rotational torque is also generated in the pointing member 24 to rotate the rotation preventing members 25 and 26. Therefore, a stress for deforming the elastic flanges 27 and 28 shown in FIG. The deformation of the flanges 27 and 28 absorbs the impact.
[0038]
Like the seismic isolation device A and the seismic isolation device B, the above-described seismic isolation device C exhibits an effective seismic isolation function against a shock load in the vertical direction, but also has an effect on normal roll. The relative movement of the rolling member 23 and the upper member 21 and the lower member 22 exerts a seismic isolation effect. Furthermore, since the rolling member 23 is formed in a spindle shape, and the contact surface with the upper member 21 and the lower member 22 is formed as a curved surface, the seismic isolation device A can be used not only in the left-right direction but also in one set. It also exerts an effect on shaking in the front-back direction.
[0039]
10 and 11 show a fourth embodiment of the seismic isolation device according to the present invention. The seismic isolation device D is interposed between an upper member 31 fixed to the upper structure 1, a lower member 32 supported by the base member 2, and the upper member 31 and the lower member 32. This is a seismic isolation device having a rolling member 33 and elastic members supporting both sides of the upper member 31 and the lower member 32.
[0040]
In this seismic isolation device D, the contact surface between the upper member 31 and the lower member 32 and the rolling member 33 is formed as a curved surface, and the rolling member 33 is substantially flat and has an end portion having straight portions at both ends. The rolling member 33 and the upper member 31 or the lower member are formed until the end 34 of the rolling member 33 comes into contact with the upper member 31 or the lower member 32. It operates with rolling friction between 32. After the end 34 of the rolling member 33 comes into contact with the upper member 31 or the lower member 32, sliding friction between the rolling member 33 and the upper member 31 or the lower member 32 occurs. It is configured to work with.
[0040]
Until the end 34 of the rolling member 33 contacts the upper member 31 or the lower member 32, the seismic isolation device D configured as described above operates the rolling member 33 by rolling friction with low resistance. Can be relatively freely and quickly moved. However, after the end 34 comes into contact with the upper member 31 or the lower member 32, the rolling member 33 cannot perform a rolling operation because the end 34 is stuck. It moves by sliding friction between the lower members.
[0041]
This means that it responds quickly to shocking vibrations in the initial stage, but resists large vibrations more than a certain degree, and suppresses the vibration of the structure. Is what you do. Therefore, the resistance is suddenly increased with respect to a certain level or a shaking exceeding a limit, thereby exerting a damping action.
[0042]
It should be noted that the seismic isolation device of the present invention is not limited to the above-described embodiment, and it is needless to say that various modes are possible within the scope of the claims. For example, the shapes and dimensions of the upper member, the lower member, the elastic member, and the support member are not particularly limited, and an optimum member can be selected according to a structure or a place to be used. In addition, the curved surface shape of the contact surface between the rolling member and the upper and lower members and the size of the detent member can of course be selected optimally based on experimental results and the like.
[0043]
【The invention's effect】
As described above, the seismic isolation device of the present invention is provided with an upper member fixed to an upper structure, a lower member supported by a base member, and interposed between the upper member and the lower member. And a contact surface between the upper member and the lower member and the rolling member is formed as a curved surface. The member is formed in a ball shape having a substantially elliptical cross section, and a first contact surface where the upper member contacts the rolling member, and a second contact surface where the lower member contacts the rolling member, By adopting a configuration in which the perpendicular position is different, it is possible to absorb the shock even in the case of a direct earthquake, so that the upper structure can be protected from the damage caused by the earthquake.
[0044]
Further, since the shape of the rolling member is formed in a spherical shape with a substantially elliptical cross section, one seismic isolation device can exhibit an effect against shaking in all directions, and is excellent in a simple structure. It is possible to provide a seismic isolation device that can exhibit the effect.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a main part of a first embodiment of a seismic isolation device of the present invention.
FIG. 2 is a side view showing a sectional structure of the seismic isolation device of FIG.
FIG. 3 is a sectional view showing an operation state of the seismic isolation device of FIG. 1;
FIG. 4 is a cross-sectional view showing a second embodiment of the seismic isolation device of the present invention.
FIG. 5 is a sectional view showing an operation state of the seismic isolation device of FIG. 4;
FIG. 6 is a perspective view showing a main part of a third embodiment of the seismic isolation device of the present invention.
FIG. 7 is a side view showing a sectional structure of the seismic isolation device of FIG.
FIG. 8 is a sectional view showing an operation state of the seismic isolation device of FIG. 6;
FIG. 9 is a sectional view showing an operation state of the seismic isolation device of FIG. 6;
FIG. 10 is a side view showing a main part of a fourth embodiment of the seismic isolation device of the present invention.
11 is a side view showing an operation state of the seismic isolation device of FIG.
[Explanation of symbols]
A seismic isolation device
B seismic isolation device
C seismic isolation device
1 superstructure
2 Basic members
3 Upper member
3a Rack gear
4 Lower member
4a Rack gear
5 Rolling member
5a Involute gear
6 elastic members
7 Elastic member
8 Elastic members
9 Elastic members
11 Upper member
12 Lower member
13 Rolling member
14 Supporting members
15 Elastic member
16 Elastic member
17 Elastic flange
18 Elastic flange
19 Cover member
21 Upper member
22 Lower member
23 Rolling member
24 Supporting members
25 Non-rotating member
26 Non-rotating member
27 Elastic fixing member
28 elastic fixing member
31 Upper member
32 Lower member
33 Rolling member
34 support members
35 elastic members
36 elastic members

Claims (8)

An upper member fixed to an upper structure, a lower member supported by a base member, a rolling member interposed between the upper member and the lower member, and a posture holding of the rolling member A seismic isolation device comprising:
The contact surface between the upper member and the lower member and the rolling member is formed in a curved surface, the rolling member is formed in a ball shape having a substantially elliptical cross section, and the upper member and the rolling member are in contact with each other. A seismic isolation device, wherein a first contact surface and a second contact surface where the lower member and the rolling member contact each other have different perpendicular positions. The posture maintaining means of the rolling member, an involute gear formed on the surface of the rolling member, a rack gear geared with the involute gear formed on the inner surface of the upper member and the lower member, The seismic isolation device according to claim 1, wherein the seismic isolation device is an elastic member mounted outside the upper member. 2. The seismic isolation device according to claim 1, wherein the posture maintaining means of the rolling member is a pointing member that penetrates the rolling member in a lateral direction, and an elastic flange that supports both sides of the pointing member. 3. . The posture maintaining means of the rolling member is a supporting member that penetrates the rolling member in the axial direction, a detent part formed at both ends of the supporting member, and an elastic fixing member that fixes the detent part. The seismic isolation device according to claim 1, wherein: A seismic isolation device having an upper member fixed to an upper structure, a lower member supported by a base member, and a rolling member interposed between the upper member and the lower member. ,
The contact surface between the upper member and the lower member and the rolling member is formed into a curved surface, the rolling member is formed in a ball shape having a substantially elliptical cross section, and an involute gear is formed on the surface, and A rack-shaped gear meshing with the involute gear is formed on the inner surfaces of the member, the lower member, and the rolling member, a first contact surface where the upper member and the rolling member abut, and the lower member. And a second contact surface where the rolling member abuts at a different perpendicular position. An upper member fixed to an upper structure, a lower member fixed to a base member, a rolling member interposed between the upper member and the lower member, and A penetrating pointing member, an elastic flange supporting both sides of the pointing member, and a seismic isolation device having elastic members mounted on both sides of the upper member and the lower member,
The contact surface between the upper member and the lower member and the rolling member is formed in a curved surface, the rolling member is formed in a ball shape having a substantially elliptical cross section, and the upper member and the rolling member are in contact with each other. The seismic isolation device is characterized in that a first contact surface, a second contact surface that contacts the lower member and the rolling member have different perpendicular positions. An upper member fixed to an upper structure, a lower member supported by a base member, a rolling member interposed between the upper member and the lower member, and A support member that penetrates, a detent part formed at an end of the support member, an elastic fixing member that supports the detent, and an elastic member mounted on both sides of the upper member and the lower member. A seismic isolation device having
The contact surface between the upper member and the lower member and the rolling member is formed into a curved surface, the rolling member is formed in a substantially flat spindle shape, and the second member in which the upper member and the rolling member abut. A seismic isolation device characterized in that a first contact surface, a second contact surface where the lower member and the rolling member contact each other have different perpendicular positions. An upper member fixed to an upper structure, a lower member supported by a base member, a rolling member interposed between the upper member and the lower member, and supporting both sides of the support member A seismic isolation device having an elastic member,
The contact surface between the upper member and the lower member and the rolling member is formed into a curved surface, and the rolling member is formed into a sphere having a substantially flat end having straight ends at both ends, and Until the end of the member contacts the upper member or the lower member, the member operates by rolling friction between the rolling member and the upper member or the lower member, and the supporting member of the rolling member is The seismic isolation device characterized in that after contacting the upper member or the lower member, the seismic isolation device moves by sliding friction between the rolling member and the upper member or the lower member.

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