JP2000205330A - Base isolation structure of upper structural body such as building, support, road - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent at least rolling of an upper structural body such as a building, a support even if lateral vibration occurs when an earthquake occurs. SOLUTION: In a base isolation structure of an upper structural body such as a building, a support, a road, which is provided between a foundation and the upper structural body, this base isolation structure consists of a vessellike support base 1 which has a curved bottom part 3 and whose upper end is opened, a vertical shaft 11 in which a spherical shaft part 12 is internally mounted through a seal bearing 15 in the support base 1, an upper structural body U provided integrally in the vertical shaft 11, a fixing member 20 fixed to an upper end part of the vessel so as to press a seal member 15, a pressure medium storage chamber formed between an outer peripheral face in a lower end part of the spherical shaft part 12 and a bottom face inside the support base 1 to apply a pressure in the upward direction on the spherical shaft part 12 of the vertical shaft 11 by pressure medium, and a pressure medium 26 filled into the pressure medium storage chamber. The support base 1 tilts and rotates centered on the spherical shaft part 12 when lateral vibration of an earthquake occurs.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation structure for an upper structure such as a building, a pillar, a road, and the like.

[0002]

2. Description of the Related Art In recent years, various measures have been taken against the lateral and vertical sway of an earthquake by installing a seismic isolation device on a foundation portion of a building or the like. For example, a vibration reducing means such as a laminated rubber, a spring member or the like is employed between the foundation and the upper structure, so that vibration is not directly applied to the upper structure such as a building.

[0003] However, most of the vibration reduction means aim at reducing the vibration of the vertical movement, and there is a problem that the structure including the support sways right and left when the vehicle rolls.

[0004]

SUMMARY OF THE INVENTION In view of the above drawbacks, the first object of the present invention is to provide a method for controlling the upper structure of a building, a column or the like even if a roll occurs during an earthquake. Do not roll. A second object is to smoothly tilt and rotate the support table when rolling. A third object is to allow the support base to smoothly tilt and rotate even if the pressure medium in the pressure medium storage chamber formed at the lower end of the upper structure leaks to the outside. A fourth object is to be able to cope with not only the roll but also the pitch of an earthquake.

[0005]

According to the present invention, there is provided a seismic isolation structure for a superstructure such as a building, a pillar or a road, which is provided between a foundation and a superstructure. In the seismic structure, this seismic isolation structure is composed of a container-like support base with an open top with a curved bottom, a vertical axis in which a spherical shaft is mounted via a seal bearing in the support base, and a vertical axis. An upper structure integrally or via an elastic member, a fixing member fixed to the upper end of the container so as to press the seal member, and a pressure applied to the spherical shaft portion of the vertical shaft. A pressure medium storage chamber formed between the outer peripheral surface at the lower end of the spherical shaft portion and the bottom surface inside the support for applying an upward pressure by the medium; and a pressure medium filled in the pressure medium storage chamber. The support base is spherical when an earthquake rolls. Characterized by tilting rotating parts around the.

Further, the seismic isolation structure of a superstructure such as a building, a support or a road according to the present invention is a seismic isolation structure of a superstructure such as a building, a support or a road installed between a foundation and an upper structure. In this seismic isolation structure, a container-like support base having an upper end opening having a curved bottom part, a vertical axis in which a spherical shaft part is provided via a seal bearing in the support base, and an integral part of the vertical axis are provided. An upper structure, a fixing member fixed to an upper end of the container so as to press the seal member, and a spherical shaft for applying an upward pressure to the spherical shaft of the vertical shaft by a pressure medium. And a pressure medium storage chamber formed between the outer peripheral surface at the lower end of the portion and the bottom surface inside the support base, and the pressure medium filled in the pressure medium storage chamber. Cylinder part integrally provided on the end face and inserted into this cylinder part The part is slidably fitted with a building, a strut or the like, and the support base is tilted and rotated around a spherical shaft part when an earthquake rolls. And

Further, the seismic isolation structure of a superstructure such as a building, a support, or a road according to the present invention is a seismic isolation structure of a superstructure such as a building, a support, or a road installed between a foundation and the superstructure. In this seismic isolation structure, a container-like support base having an opening at the upper end having a curved bottom, a vertical axis in which a spherical shaft portion is provided via a seal bearing in the support base, and an integral part of the vertical axis are provided. The upper structure, a fixing member fixed to the upper end of the container so as to press the sealing member, and the spherical member for applying upward pressure to the spherical shaft portion of the vertical axis by a pressure medium. A pressure medium storage chamber formed between the lower end outer peripheral surface of the shaft portion and the bottom surface inside the support, and a pressure medium filled in the pressure medium storage chamber. Are formed on the other hand, while the engaging projections Established the resilient pedestal means having a coupling portion on a foundation, a support, when rolling earthquake occurs, characterized by tilting rotates about the spherical shaft portion.

In each of the above inventions, the seal bearing is a side seal bearing that slides on the lower side of the spherical shaft portion of the vertical shaft, and is pressed against the lower seal bearing and slides on the upper side of the spherical shaft portion. And an upper seal bearing.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. First, reference numeral 1 denotes a support base having a bottom portion 3 below the large-diameter portion 2 formed in a curved cross section so that the bottom portion 3 can be tilted and rotated about a spherical shaft portion 12 of a vertical shaft 11 of the upper structure U. The curved bottom 3 of the support 1
Is formed in a slightly bowl shape, for example, like the lower part of a bare bulb. On the other hand, the radius of the circumferential body 4 having an inclined cross section connected to the large-diameter part 2 is gradually reduced to reach the cylindrical upper end 5.

In this embodiment, the support base 1 is formed in a container shape having an upper end opening. The inner wall surface of the support base 1 has a curved inner peripheral surface 6 as shown in FIG. The lower surface has a slightly hemispherical bottom surface 7 continuously connected to the peripheral surface 6 via an annular step surface. A flow path 8 for filling a pressure medium is formed in the peripheral body 4 as appropriate. Further, a flange portion 10 having a plurality of female screw holes 9 is formed at an edge portion of the cylindrical upper end portion 5, and an upper edge portion of the curved inner peripheral surface 6 is provided with a lower seal bearing described later. It is formed in a step shape in consideration of the shape. Accordingly, the support 1 is formed in a general pot shape in appearance, and is installed between the foundation G and the upper structure U such as a building, a support, a road, and the like.

Reference numeral 11 denotes a vertical shaft in which a spherical shaft portion 12 is provided inside the support base 1 via a seal bearing described later. In the present embodiment, the vertical shaft 11 includes the spherical shaft portion 12 provided inside the support base 1 and a columnar projection portion 14 connected to the spherical shaft portion 12 via a constricted portion 13. On the upper end surface of the columnar projection 14 directly or indirectly,
Upper structures U such as roads and plant equipment are integrally connected. Although not a limitation of the present invention, a notch 12a is formed in the lower end of the spherical shaft 12 in the circumferential direction.

Reference numeral 15 denotes a seal bearing having a curved bearing surface which is in sliding contact with the spherical shaft portion 12 of the vertical shaft 11. In this embodiment, this seal bearing 15 slides below the spherical shaft portion 12 of the vertical shaft. The lower seal bearing 16 is in contact with the upper seal bearing 17 and is provided on the lower seal bearing and is in sliding contact with the upper side of the spherical shaft portion. That is, the seal bearing 1
5 is divided into two in consideration of the convenience of combination.

Thus, the lower seal bearing 16 and the upper seal bearing 17 are connected to each other by the flange portions 16a, 17a.
b, the lower seal bearing 16 is mounted so as to be joined to the curved inner peripheral surface 6 of the support 1, while the upper seal bearing 17 is a fixing member fixed to the upper end of the support 1. 20
As a result, it is joined to the lower seal bearing 16 in a pressed state. Note that the seal bearing 15 is slightly elastic.

The fixing member 20 comprises an annular fitting portion 21 for pressing the outer peripheral wall of the upper seal bearing 17 and a flange portion 22 formed at the lower end of the fitting portion 21. A plurality of through holes 23 corresponding to the above-described female screw holes 9 are formed in 22.

Next, reference numeral 25 denotes a pressure medium storage chamber filled with a pressure medium 26. The pressure medium storage chamber 25 is formed between the outer peripheral surface at the lower end of the spherical shaft portion 12 and the hemispherical bottom surface 7 inside the support base. Of course, if the shape of the lower end portion of the spherical shaft portion 12 is changed in design, the volume of the pressure medium storage chamber 25 increases.

However, in the pressure medium storage chamber 25,
The pressure medium 26, in this embodiment, grease is filled from the flow path 8 described above, and the grease as an example of the pressure medium 26 constantly pushes the spherical shaft portion 12 of the vertical shaft 11 upward.

Reference numeral 27 denotes a joint attached to a valve (open / close valve, check valve, etc.) 28. The valve 28 is attached to the flow channel 8 and is attached with a sealing means such as an adhesive, a sealing tape, and welding as a fixing means.

FIG. 2 shows an initial state in which the container-like support 1 is installed between the foundation G and the upper structure U in a substantially vertical state. In this case, the internal pressure of the pressure medium storage chamber 25 acts uniformly by the principle of Pascal. Therefore, the pressure of the pressure medium 25 not only acts in the direction of pushing down the support table 1 but also pushes up the vertical shaft 11, so that the load W of the upper structure U is reduced. For this reason, the frictional resistance between the lower seal bearing 16 and the spherical shaft portion 12 is reduced, and the container-like support 1 is easily tilted.

Therefore, if an earthquake rolls in the left-right direction as shown in FIG.
And move in the same direction. As a result, the seal bearing 15 of the support 1 slides about the spherical shaft portion 12 of the vertical shaft 11, so that the support 1 tilts and rotates in response to the shaking of the earthquake as shown by a practical or imaginary line. . That is, when the base G moves in the direction of the arrow, the curved bottom 3 of the support 1 moves together in the direction of movement of the base G, so that the support 1
Rotate around the center. At this time, since the roll of the earthquake does not directly act on the upper structure U, it is positioned as it is on the vertical line.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, in the first embodiment, the curved bottom 3 of the support may be made elastic. The lower end of the upper structure U is
For example, it may be a part of a building, or may be a separate body (an intervening support) from the building. Further, even if the pressure medium 26 leaks from the pressure medium storage chamber 25, the support base 1 can be used in the upper structure U.
Although a high-viscosity liquid (for example, grease) is used so as to easily slide with respect to, any of a liquid, a semi-fluid, and a gas may be used. In particular, in the case of the first embodiment, when the pressure medium leaks from the pressure medium storage chamber 25, the vertical shaft 11 and the spherical shaft portion 12 are pressed against the hemispherical bottom surface 7 inside the support base 1; Therefore, the support 1 slides favorably.

Hereinafter, in this section, another embodiment will be described in which the first embodiment is defined as a specific invention and other components are added to the first embodiment. Therefore, the same portions as those of the first embodiment are denoted by the same or similar reference numerals, and duplicate description will be omitted.

First, FIGS. 5 and 6 show a second embodiment of the present invention. The main difference between the second embodiment and the first embodiment is that a pedestal means 30 is provided below the support table to absorb horizontal and vertical vibrations of an earthquake.

The pedestal means 30 is composed of a pedestal main body 31 having an arcuate cross section and an elastic body (for example, synthetic rubber) 32 having an arcuate cross section buried so as to protrude into a recess at the center of the pedestal main body 31. Is composed. The elastic body 32 has a slightly thick disk shape, and the upper surface thereof has a dish shape.

In the above configuration, for example, when the earthquake rolls to the left as shown in FIG. 7, the pedestal means 30 moves together with the foundation G in the same direction. A positive load acts on the right side of the elastic body 32 of the means 30, and contracts as shown in the figure. Therefore, with this configuration, the sway of the earthquake can be absorbed not only by the support base 1 but also by the pedestal means 30.

The elastic member 32 of the pedestal means 30
Can be arbitrarily changed in design. For example, FIGS. 8 and 9
Is a modification of the pedestal means 30A, and the elastic body 32A of the pedestal means 30A has a laminated structure having a liquid or air inside. With this configuration, there is an advantage that the elastic body 32A of the pedestal means 30A is easily deformed.

Next, FIGS. 10 and 11 show a third embodiment of the present invention. The main difference between the third embodiment and the first embodiment is that a resilient member is provided between the upper structure U1 and the vertical shaft 11B so as to cope with the roll and pitch of the earthquake simultaneously. 35 is interposed.

The vertical axis 11B has the protrusion 1
A storage recess 36 is formed from the upper end surface of 4B to deep inside the spherical shaft portion 12B, and a resilient member 35 whose upper end protrudes is fitted into the storage recess 36. The lower end of the upper structure U1 is provided with a support rod 37 for a resilient member whose lower end is always loosely fitted into the storage recess 36.
Are provided integrally, and are pressed against the support rod 37 with the upper end of the resilient member 35 being supported.

The third embodiment is mainly different from the first embodiment in that the pedestal means 30 having the same structure as the second embodiment is provided on a foundation. For convenience of explanation, the reference numerals of the pedestal means 30 are shown as they are, and the explanation is omitted.

With such a configuration, when a pitching of an earthquake occurs, the vibration of the pitching can be absorbed by at least the elastic member 35.

Next, FIGS. 12 and 13 show a fourth embodiment of the present invention. The main difference between the fourth embodiment and the first embodiment is that the structure of the upper structure U2 is improved, and the second and third embodiments are modified.
This is to make it possible to absorb the vibration of the pitching of the earthquake as in the embodiment.

Therefore, the points mainly different from the first embodiment will be briefly described. First, U2 is an upper structure, the upper structure U2 is a cylinder unit 40 integrally provided on the upper end surface of the vertical shaft 11C, and a building in which the lower end of the insertion is slidably fitted to the cylinder unit 40. And a heavy object 41 such as a support.

The cylinder section 40 has a vibration absorber storage chamber 42 having an upper end opening. The vibration absorber storage chamber 42 may be made of elastic rubber, but in this embodiment, the vibration absorber 43 is provided. Is filled with gas.

A piston 45 is formed at the inner end of the lower end 44 of the heavy object 41.
5 is provided with an O-ring 46.

The cylinder portion 40 has an upper support plate 47 having a stepped center hole. The lower surface of the upper support plate 47 and the flange-shaped peripheral end portion 48 of the cylinder portion 40 are connected to a second fixing member 49. And are integrally connected to each other in a joined state. In addition, a plurality of seals 50 are provided at the upper end opening of the cylinder portion 40 as appropriate. 51 is the second
A second joint having the valve 52 of FIG.

The main difference between the fourth embodiment and the first embodiment is that the pedestal means 30 having the same structure as the second embodiment is provided on the base. For convenience of explanation, the reference numerals of the pedestal means 30 are shown as they are, and the explanation is omitted. Also,
For example, a fluid pipe may be connected via a joint 27, and a pressure accumulator (not shown) may be attached to the tip of the pipe.

In the above configuration, when a pitching of the earthquake occurs, the support 1 moves upward together with the foundation. Then, the cylinder portion 40 of the upper structure U2 moves upward together with the support 1 with respect to the weight 41 of the upper structure U2. At this time, the piston portion 45 of the insertion lower end portion 44
Compresses the vibration absorber 43 in the vibration absorber storage chamber 42, so that the vibration of pitching can be absorbed.

Next, FIGS. 14 and 15 show a fifth embodiment of the present invention. First, the fifth embodiment is different from the first embodiment mainly in that a plurality of engaging projections 55 are formed on the outer wall surface of the curved bottom 3D of the support base 1D.
The elastic base means 30D having an engaged portion (upper engaging projection and engaging groove) 56 which engages with the base member 30D is provided on the foundation.

In the present embodiment, the engagement projection 55 is formed of a first engagement projection 55a at the center and an annular second engagement projection located concentrically with respect to the first engagement projection 55a. 55b. On the other hand, the engaged portion 56 of the elastic pedestal means 30D is formed on a concentric circle via a central groove 56a with which the first engaging projection 55a engages and an elastic annular projection 57 based on the central groove 56a. Annular groove 56b.

The fifth embodiment differs from the first embodiment mainly in that a plate-like elastic member 60 is interposed between the projection 14D of the vertical shaft 11D and the upper structure U3. With this configuration, in the case of an earthquake roll,
The support base 1D rides over the elastic annular projection 57 and can be tilted and rotated in any direction of 360 degrees as in the first embodiment, and the vertical vibration of the earthquake as in the second and third embodiments. Can be absorbed.

[0040]

As is clear from the above description, the present invention has the following effects. (1) Even if a roll occurs in the event of an earthquake, upper structures such as buildings and columns do not substantially roll. (2) The support table smoothly tilts and rotates when rolling. (3) Depending on the embodiment, it is possible to cope with not only the roll of the earthquake but also the pitch.

[Brief description of the drawings]

1 to 4 are schematic explanatory views showing a first embodiment of the present invention. 5 to 7 are schematic explanatory views showing a second embodiment of the present invention. FIGS. 8 and 9 are explanatory views showing a modification of the main part of the second embodiment. FIGS. 10 and 11 are schematic explanatory views showing a third embodiment of the present invention. 12 and 13 are schematic explanatory diagrams showing a fourth embodiment of the present invention. 14 and 15 are schematic explanatory views showing a fifth embodiment of the present invention.

FIG. 1 is a partially cutaway perspective view of a first embodiment.

FIG. 2 is a longitudinal sectional view.

FIG. 3 is an exploded perspective view of a partly cutaway.

FIG. 4 is an explanatory view showing a tilted state of a support base.

FIG. 5 is a schematic longitudinal sectional view of a second embodiment.

FIG. 6 is an exploded perspective view of a partly cutaway of the second embodiment.

FIG. 7 is an explanatory view showing a tilted state of a support base.

FIG. 8 is a partially cutaway perspective view showing a modification of the main part of the second embodiment.

FIG. 9 is a schematic vertical sectional view of a main part shown in FIG. 8;

FIG. 10 is a schematic longitudinal sectional view of a third embodiment.

FIG. 11 is an exploded perspective view of a partially cut-out according to the third embodiment.

FIG. 12 is a schematic longitudinal sectional view of a fourth embodiment.

FIG. 13 is an exploded perspective view of a partly cutaway of the fourth embodiment.

FIG. 14 is a schematic longitudinal sectional view of a fifth embodiment.

FIG. 15 is an exploded perspective view of a partially cut-out according to a fifth embodiment.

[Explanation of symbols]

1, 1D: support base, 2: large diameter portion, 3, 3D: curved bottom portion,
4 ... Circumference trunk part, 5 ... Cylindrical upper end part, 6 ... Curved inner peripheral surface, 7 ...
Bottom, 11, 11B, 11C ... vertical axis, 12, 12B ...
Spherical shaft part, 13 ... constricted part, 14, 14B, 14D ... projection part, 15 ... seal bearing, 16 ... lower seal bearing, 17 ...
Upper seal bearing, 20: fixing member, 21: fitting portion, 22
... Flange, 23 ... Through hole, 25 ... Pressure medium storage chamber, 26 ...
Pressure medium, 27 joint, 28 valve, 30, 30A, 30
D: pedestal means, 31: pedestal body, 32, 32A: elastic body, 35: resilient member, 36: storage recess, 37: support rod, 40: cylinder part, 41: heavy object, 42: vibration absorber Storage room, 43: vibration absorber, 44: lower end of insertion, 45
... piston part, 55 ... engagement projection, 56 ... engaged part, 60
... elastic member, G ... foundation, U, U1, U2, U3 ... superstructure.

[Procedure amendment]

[Submission date] January 19, 1999 (1999.1.1)
9)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0035

[Correction method] Change

[Correction contents]

The main difference between the fourth embodiment and the first embodiment is that the pedestal means 30 having the same structure as the second embodiment is provided on the base. For convenience of explanation, the reference numerals of the pedestal means 30 are shown as they are, and the explanation is omitted. Also,
For example, a fluid pipe may be connected via a joint 51, and a pressure accumulator (not shown) may be attached to the tip of the pipe.

Claims (8)

[Claims] In a seismic isolation structure of an upper structure such as a building, a pillar, a road, etc. installed between a foundation and an upper structure, the seismic isolation structure has a container-like support of an upper end opening having a curved bottom. A base, a vertical shaft in which a spherical shaft portion is provided inside the support base via a seal bearing, an upper structure integrally provided with the vertical shaft, and a container of the container so as to press the seal member. A fixing member fixed to an upper end portion, formed between an outer peripheral surface at a lower end portion of the spherical shaft portion and a bottom surface inside the support base for applying upward pressure to the spherical shaft portion of the vertical shaft by a pressure medium. Pressure medium storage chamber, and a pressure medium filled in the pressure medium storage chamber, and the support base tilts and rotates around a spherical shaft portion when an earthquake rolls. Characteristic seismic isolation structure of superstructures such as buildings, columns and roads. 2. The seal bearing according to claim 1, wherein the seal bearing includes a side seal bearing that slides on a lower side of the spherical shaft portion of the vertical shaft, and an upper side of the spherical shaft portion that comes into pressure contact with the lower seal bearing. A building comprising: an upper seal bearing that slides;
Seismic isolation structure for upper structures such as columns and roads. 3. A seismic isolation structure for an upper structure such as a building, a column, a road, etc. installed between a foundation and an upper structure, wherein the seismic isolation structure is a container-like support for an upper end opening having a curved bottom. A base, a vertical shaft in which a spherical shaft portion is provided inside the support base via a seal bearing, an upper structure integrally provided with the vertical shaft, and a container of the container so as to press the seal member. A fixing member fixed to an upper end portion, formed between an outer peripheral surface at a lower end portion of the spherical shaft portion and a bottom surface inside the support base for applying upward pressure to the spherical shaft portion of the vertical shaft by a pressure medium. The pressure medium storage chamber, and the pressure medium filled in the pressure medium storage chamber, the support table is mounted on a pedestal means having an elastic body, and when an earthquake rolls, Buildings, columns, roads, etc. characterized by tilting and rotating around a spherical shaft Seismic isolation structure of the upper structure. 4. The pedestal means according to claim 3, wherein the pedestal means is composed of a pedestal main body having an arcuate cross section, and an elastic body having an arcuate cross section buried so as to protrude into a recess at the center of the pedestal main body. A seismic isolation structure for superstructures such as buildings, columns, and roads. 5. A seismic isolation structure for an upper structure such as a building, a pillar, a road, etc. installed between a foundation and an upper structure, wherein the seismic isolation structure has a container-like support for an upper end opening having a curved bottom. A base, a vertical shaft in which a spherical shaft portion is provided inside the support base via a seal bearing, an upper structure provided on the vertical shaft via a resilient member, and a structure for pressing the seal member. A fixing member fixed to the upper end of the container, and a lower end outer peripheral surface of the spherical shaft portion and a bottom surface inside the support base for applying upward pressure by a pressure medium to the spherical shaft portion of the vertical shaft. A pressure medium storage chamber formed between the pressure medium storage chamber and the pressure medium filled in the pressure medium storage chamber.
A seismic isolation structure for upper structures such as buildings, columns, and roads, which tilts and rotates around a spherical axis when an earthquake rolls. 6. A storage shaft according to claim 5, wherein a storage recess is formed in the vertical shaft from the upper end surface to the inside of the spherical shaft portion, and a resilient member whose upper end protrudes is fitted into the storage recess. A seismic isolation structure for buildings, supports, roads, and other superstructures that are characterized by 7. A seismic isolation structure for an upper structure such as a building, a pillar, a road, etc., installed between a foundation and an upper structure, wherein the seismic isolation structure is a container-like support for an upper opening having a curved bottom. A base, a vertical shaft in which a spherical shaft portion is provided inside the support base via a seal bearing, an upper structure integrally provided with the vertical shaft, and a container of the container so as to press the seal member. A fixing member fixed to an upper end portion, formed between an outer peripheral surface at a lower end portion of the spherical shaft portion and a bottom surface inside the support base for applying upward pressure to the spherical shaft portion of the vertical shaft by a pressure medium. And a pressure medium filled in the pressure medium storage chamber. The upper structure is a cylinder unit integrally provided on an upper end surface of a vertical shaft, and is inserted into the cylinder unit. It consists of buildings, supports, and other heavy objects whose lower end is slidably fitted. The seismic isolation structure of a superstructure such as a building, a pillar, or a road, wherein the support base tilts and rotates about a spherical shaft part when an earthquake rolls. 8. A seismic isolation structure for an upper structure such as a building, a pillar, a road, etc. installed between a foundation and an upper structure, wherein the seismic isolation structure has a container-like support for an upper end opening having a curved bottom. A base, a vertical shaft in which a spherical shaft portion is provided inside the support base via a seal bearing, an upper structure integrally provided with the vertical shaft, and a container of the container so as to press the seal member. A fixing member fixed to an upper end portion, formed between an outer peripheral surface at a lower end portion of the spherical shaft portion and a bottom surface inside the support base for applying upward pressure to the spherical shaft portion of the vertical shaft by a pressure medium. And a pressure medium filled in the pressure medium storage chamber. A plurality of engagement projections are formed on the curved bottom of the support base, while the engagement projections are engaged with these engagement projections. An elastic pedestal means having a mating engaged portion is installed on the foundation, and the support pedestal is grounded. A seismic isolation structure for upper structures such as buildings, columns, and roads, which tilts and rotates around a spherical shaft when a quake rolls.