JP2000199540A - Base isolation structure of upper structure of building, stay, and road - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent at least rolling of the upper structure of a building and a stay when rolling occurs during the occurrence of an earthquake. SOLUTION: In a base isolation structure of an upper structure of a building, a stay, and a road built between a foundation and an upper structure, this base isolation structure comprises a support bed 1 having a curved bottom 3; a vertical shaft 7 integrally arranged at a support bed with a spherical shaft part 8 protruded from the upper end face 5 of the support bed; a cylindrical seal bearing 11 having a curved bearing surface 12 making slide contact with the spherical shaft part 8 of the vertical shaft 7; a support plate 20 arranged at the vertical shaft 7 through a central hole 22 in a manner to support the seal bearing 11; an upper structure 30 with which a lower end part 31 is integrally mounted in a manner to press the seal bearing 11 against the support plate 20; and a pressure medium containing chamber 33 formed at the lower end part 31 of the upper structure 30. When rolling of an earthquake occurs, the support bed 1 is rotated in an inclination state around a spherical shaft part 8.

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 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, the seismic isolation structure includes a support 1 having a curved bottom 3 and a vertical axis integrally provided on the support so that the spherical shaft 8 protrudes from the upper end surface 5 of the support. 7 and a curved bearing surface 1 that slides on the spherical shaft portion 8 of the vertical shaft 7.
2 and a cylindrical seal bearing 11
And a support plate 20 provided on the vertical shaft 7 through a center hole 22 so as to support the support plate 1.
An upper structure 30 integrally formed with a lower end 31 so as to press the seal bearing 11 on the lower surface, and a pressure medium storage chamber 33 formed at the lower end 31 of the upper structure 30.
The support table 1 is characterized in that when a roll of earthquake occurs, the support table 1 tilts and rotates around the spherical shaft portion 8.

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. This seismic isolation structure is installed via a first pitch vibration absorbing means 45 laid on a foundation G and has a support 1A having a curved bottom 3A, and a spherical shaft from an upper end surface 5 of the support. A cylindrical seal bearing 11 having a vertical shaft 7 integrally provided on a support base such that the portion 8 protrudes, and a curved bearing surface 12 slidably contacting the spherical shaft portion 8 of the vertical shaft 7; A support plate 20 provided on the vertical shaft 7 through a center hole 22 so as to be able to support the seal bearing 11 and a lower end portion 31A so as to press the seal bearing 11 against the support plate 20 are integrated. Mounted upper structure 30A
And a pressure medium storage chamber 33 formed at the lower end 31A of the upper structure 30A.
When a roll of the earthquake occurs, it moves in the same direction together with the first pitch vibration absorbing means 45 and tilts and rotates around the spherical shaft portion 8.

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. The seismic isolation structure comprises a support 1A having a curved bottom 3A, a vertical shaft 7 integrally provided on the support so that a spherical shaft 8 protrudes from an upper end surface 5 of the support, and A cylindrical seal bearing 11 having a curved bearing surface 12 slidably in contact with the spherical shaft portion 8 of the shaft 7, and a center hole 22 through the vertical shaft 7 so as to be able to support the seal bearing 11. A support plate 20 provided, an upper structure 30A having a lower end 31A integrally attached to the support plate 20 so as to press the seal bearing 11, and having a pitch vibration absorbing means 47; Formed at the lower end 31A of the structure 30A It consists pressure medium storage chamber 33, the support table 1, when the rolling of the earthquake is characterized by tilting rotates about the spherical shaft portion 8.

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. The seismic isolation structure comprises a support 1B having a curved bottom 3; a vertical shaft 7B integrally provided on the support so that a spherical shaft portion 8B protrudes from an upper end surface 5 of the support; Axis 7
B bearing surface 12 in sliding contact with the spherical shaft portion 8B of B
Cylindrical seal bearing 11B having
The support plate 20 is provided on the vertical shaft 7B through the center hole 22 so as to support the support shaft 1B, and the lower end portion 31 is integrally attached to the support plate 20 so as to press the seal bearing 11B. And a pressure medium storage chamber 33B formed at the lower end 31B of the upper structure 30. The pressure medium storage chamber 33B is filled with a compressible pressure medium 35B. The support 1B is provided with a spherical shaft 8 when the earthquake rolls.
It is characterized by tilting and rotating around B.

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 addition, this seismic isolation structure has a support base 1C having a curved bottom 3.
A vertical shaft 7 provided integrally with the support so that the spherical shaft 8 protrudes from the upper end surface 5 of the support; and a curved bearing slidably contacting the spherical shaft 8 of the vertical shaft 7 Face 12
Cylindrical seal bearing 11 having
Center hole 2 in the vertical axis 7 so that
2, an upper structure 30C integrally provided with a lower end 31C so as to press the seal bearing 11 against the support plate 20, and a lower end of the upper structure 30C. Pressure medium storage chamber 3 formed in 31C
3 and the upper structure 30C is provided at the lower end 3
1C and the lower end portion 31C, and
Cylinder upper end 50 in which vibration absorber storage chamber 52 is formed
And the vibration absorber storage chamber 5 at the upper end 50 of the cylinder.
2 and a heavy object 51 such as a column having an insertion lower end portion 54 in which a piston portion 55 is slidably fitted, and the support base 1C is provided when an earthquake rolls. It is characterized by tilting and rotating around the spherical shaft portion 8.

[0010]

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 in which the bottom 3 below the large-diameter section 2 is formed to have a curved cross section so that the seal bearing can be tilted from a base point. The curved bottom portion 3 of the support base 1 is formed in a slightly bowl shape, for example, like a lower portion of a bare light bulb. Note that the center of the bottom of the support 1 may be somewhat planar as long as the support 1 can be tilted by the ground or the base G swaying.

On the other hand, the radius of the cone-shaped upper portion 4 connected to the large-diameter portion 2 is gradually reduced to the upper end surface 5 having an inclined cross section. A cylindrical fitting hole 6 is provided at the center of the support base 1.
Are formed. Therefore, the cross-sectional shape of the support 1 is similar to the shape of the upper part of the human body as a whole.

Reference numeral 7 denotes a vertical shaft integrally attached to the support so that the spherical shaft projects from the upper end surface 5 of the support 1. The vertical shaft 7 is connected to the spherical shaft portion 8 in a downward direction from a lower portion of the spherical shaft portion 8 via a constricted portion 9.
And a columnar insertion portion 10 that fits into the fitting hole 6 of the support base 1.
Consisting of

Next, reference numeral 11 denotes a bottom opening 13 having a curved bearing surface 12 which slides on the lower side of the spherical shaft portion 8 of the vertical shaft 7.
Seal bearing. The seal bearing 11 includes a base seal portion 14 having the bottom opening 13, and a cylindrical seal portion 15 continuously connected from an upper surface of the base seal portion 14 to the upper side.
And the base seal portion 14 is a cylindrical seal portion 1.
5 protrudes in a flange shape. Note that the seal bearing 11 is a somewhat elastic body, and the size of the upper opening 16 of the seal bearing 11 is appropriately determined in consideration of the outer diameter of the spherical shaft portion 8.

Reference numeral 20 denotes a support plate for a seal bearing. On the upper surface of the support plate 20, a fitting recess 21 is formed for fitting the base seal portion 14 of the seal bearing. A central hole 22 corresponding to the upper opening 16 of the seal bearing is formed in the center of the fitting recess 21. The support plate 20
A plurality of female screw holes 24 are formed in the peripheral end portion 23 at a required interval in the circumferential direction.

Reference numeral 30 denotes a structure such as a building, a column, a bridge, a road, a heavy object for a plant (in this embodiment, etc., referred to as an "upper structure"). Lower end 3 of this upper structure 30
In FIG. 1, a flange-shaped seal pressing portion 32 joined to the upper surface of the peripheral end portion 23 of the support plate 20 is provided, and a pressure medium storage chamber 33 is formed. The inner wall surface of the pressure medium storage chamber 33 is formed in a spherical shape facing the spherical shaft portion 8 via the pressure medium 35.

Thus, a plurality of through holes 34 are formed in the seal holding portion 32 so as to correspond to the female screw holes 24 described above. The lower part of the pressure medium storage chamber 33 is open as shown in FIG. 3, but the spherical shaft of the vertical shaft 7 is inserted into the pressure medium storage chamber 33 through the seal bearing 11 as shown in FIG. When the part 8 enters, the inside becomes a pressure medium storage chamber in which the inside is completely sealed.
As an example of 5, the grease is filled.

Reference numeral 36 denotes a female thread passage for filling fluid formed in the lower end 31 of the upper structure 30 so as to communicate with the pressure medium storage chamber 33. This passage 36 has an external thread at the outer periphery. Valve (open / close valve, check valve, etc.) 38 via joint 37
Is installed. The joint 37 is fixedly attached to the flow passage 36 by applying a sealing means such as an adhesive means, a sealing tape, and welding. Further, for example, a fluid pipe 39 can be connected via a joint 37, and a pressure accumulator (not shown) can be attached to the tip of the pipe 39.

Finally, reference numeral 40 denotes the upper structure 30 and the support plate 20.
And a plurality of fasteners for connecting and fixing
0 penetrates through holes 34 of seal holding portion 32, respectively.
It is screwed into the female screw hole 24 of the support plate 20.

FIG. 2 shows an initial state in which the support 1 is installed vertically between the foundation G and the upper structure 30 in the above configuration. In this case, the internal pressure of the pressure medium storage chamber 33 acts uniformly by the principle of Pascal. Therefore,
Since the pressure of the pressure medium 35 acts not only in the direction of pushing down the support table 1 but also in the direction of pushing up the upper structure 30, the load W of the upper structure 30 is reduced.

Therefore, if an earthquake rolls in the left-right direction as shown in FIG. 4, the support 1 moves in the same direction together with the ground or the foundation G. As a result, the spherical shaft portion 8 of the support 1 slides on the bearing surface 12 of the seal bearing 11, and the support 1 tilts and rotates as shown by a practical or imaginary line. In other words, 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 is mounted on the bearing surface 12 of the seal bearing 11 or on the spherical shaft 8. Rotate to the center. At this time, since the roll of the earthquake does not directly act on the upper structure 30, it is positioned as it is on the vertical line. Further, the internal pressure of the pressure medium storage chamber 33 does not change.

[0021]

First Embodiment In the first embodiment, the lower end of the upper structure 30 may be a part of a building, for example, or may be a separate body (an intervening support) from the building. The pressure medium 35
Uses a high-viscosity liquid (for example, grease) so that the support base 1 can easily slide with respect to the upper structure 30 even if it leaks from the pressure medium storage chamber 33. Any of a 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 33, the spherical shaft portion 8 of the vertical shaft 7 presses against the spherical inner wall surface of the pressure medium storage chamber 33. Is spherical, so that the spherical shaft portion 8 slides favorably.
Further, the same effect can be obtained even if the spherical shaft portion 8 of the vertical shaft 7 is, for example, a hemispherical shape whose upper side is cut.

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.

FIG. 5 shows a second embodiment of the present invention.
The main difference between the second embodiment and the first embodiment is that a means for absorbing the vibration of the pitching of the earthquake is provided. That is, reference numeral 45 denotes a first pitch vibration absorbing means laid on the foundation G, and the first pitch vibration absorbing means 45 is formed of an elastic body such as a spring or rubber, and in this embodiment, is formed of elastic rubber. The upper surface 46 formed in a base shape is formed in an upper surface shape of a cup so as to be entirely pressed against the curved bottom portion 3A of the support base 1A.

Therefore, for example, when the earthquake rolls to the left as shown in FIG. 5, the first pitch vibration absorbing means 45 moves in the same direction together with the foundation G. A positive load acts on the right side of the vertical pitch vibration absorbing means 45 and contracts as shown in the figure.

Reference numeral 47 denotes a lower end 31 of the upper structure 30A.
A second pitch vibration absorbing means provided in A, and this pitch vibration absorbing means 47 is also formed of a hard rubber in a plate shape. The second pitch vibration absorbing means 47 may have a multilayer structure.

With this configuration, it is possible to simultaneously absorb the horizontal and vertical vibrations of the earthquake.

FIGS. 6 and 7 show a third embodiment of the present invention. The main difference between the third embodiment and the first embodiment is that
The shape of the pressure medium storage chamber 33B formed in the lower end portion 31B of the upper structure 30B and the pressure medium 35B filled in the pressure medium storage chamber 33B can simultaneously deal with the roll and pitch of the earthquake. That is, the shape, the shape of the spherical shaft portion 8B of the support base 1B, the shape of the seal bearing 11B, and the like are devised.

That is, the pressure medium storage chamber 33B is formed, for example, in a rectangular cross section to increase the capacity for storing the pressure medium 35B. As an example of the pressure medium 35B, a gas such as gas or air is used. Further, the shape of the spherical shaft portion 8B of the vertical shaft 7B of the support base 1B is made substantially hemispherical, and the cylindrical seal portion 15B of the seal bearing 11B is replaced with the spherical shaft portion 8B.
It has a slightly long cylindrical shape so as to protrude from B.

With this configuration, when a pitching of the earthquake occurs, the hemispherical shaft portion 8B of the support 1B resists the pressure of the pressure medium 35B as shown in FIG.
Since it moves upward together with the foundation G while being guided by 1B, it is possible to absorb the vibration of pitching.

Since the pressure medium 35B filled in the pressure medium storage chamber 33B has the function of the vertical vibration absorbing means as in the second embodiment, the pressure medium 35B has a thick or multilayer structure as in the second embodiment. Elastic rubber (pitch vibration absorbing means). Therefore, the pressure medium storage chamber 33
When an elastic rubber is installed in B, the term of the pressure medium storage chamber 33B is replaced with "elastic body storage chamber 33B".

FIGS. 8 and 9 show a fourth embodiment of the present invention. The main difference between the fourth embodiment and the first embodiment is that
An improvement is made to the structure of the upper structure 30C so that the vibration of the pitching of the earthquake can be absorbed as in the second and third embodiments.

Therefore, the points mainly different from the first embodiment will be briefly described. First, an upper structure 30C has a lower end 31C having the same structure as that of the first embodiment and a cylinder upper end 5 provided integrally with the lower end 31C.
0, and a heavy object 51 such as a building or a column, into which the lower end of the insertion is slidably fitted to the upper end 50 of the cylinder. Therefore, the upper structure 30C of the fourth embodiment is a concept narrower than the terms of the first embodiment.

The upper end portion 50 of the cylinder has a vibration absorber storage chamber 52 having an upper end opening, and the vibration absorber storage chamber 52 may be made of elastic rubber. The gas as 53 is filled.

A piston 55 is formed at the inner end of the insertion lower end 54 of the heavy object 51.
5 is provided with an O-ring 56.

The upper end portion 50 of the cylinder is formed in the same manner as the lower end portion 31C, and has an upper support plate 57 having a stepped center hole, and a flange-shaped peripheral end portion 58 joined to the lower surface of the upper support plate 57. Are integrally connected via a second fixing member 59. In addition, a plurality of seals 60 are appropriately provided in the upper end opening of the cylinder upper end portion 50. Incidentally, reference numeral 61 denotes a second joint having a second on-off valve 62.

In the above configuration, when a pitching due to an earthquake occurs, the support 1C moves upward together with the foundation G as shown in FIG. Then, the lower end 31C of the upper structure 30C and the cylinder upper end 50 are connected to the upper structure 30C.
It moves upward together with the support 1C with respect to the heavy object 51 of C. At this time, the piston portion 55 of the insertion lower end portion 54 compresses the vibration absorber 53 in the vibration absorber storage chamber 52, so that the vertical vibration can be absorbed.

[0037]

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) According to the invention described in claim 2 and / or claim 3, even if the pressure medium in the pressure medium storage chamber formed at the lower end of the upper structure leaks to the outside, the support table smoothly tilts and rotates. . (4) 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. FIG. 5 is a schematic explanatory view showing a second embodiment of the present invention. FIG.
And FIG. 7 is a schematic explanatory view showing a third embodiment of the present invention. 8 and 9 are schematic explanatory views showing a fourth embodiment of the present invention.

FIG. 1 is a partially cutaway perspective view.

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 a schematic longitudinal sectional view of a third embodiment.

FIG. 7 is a schematic sectional explanatory view showing one operation in FIG. 6;

FIG. 8 is a schematic longitudinal sectional view of a fourth embodiment.

FIG. 9 is a schematic sectional explanatory view showing one operation in FIG. 8;

[Explanation of symbols]

1, 1A, 1B, 1C: support base, 2: large diameter part, 3, 3A
... curved bottom part, 4 ... upper part, 5 ... upper end face, 6 ... fitting hole, 7,
7B: vertical shaft, 8, 8B: spherical shaft portion, 11, 11B: seal bearing, 12: bearing surface, 20: support plate for seal bearing, 22: center hole, 30, 30A, 30B, 30C: upper structure, 31, 31A, 31B, 31C ... lower end portion, 3
3, 33B: pressure medium storage chamber, 35, 35B: pressure medium, 45, 47: pitch vibration absorber, 50: cylinder upper end, 51: heavy load, 52: vibration absorber storage chamber, 53:
Vibration absorber, 54: insertion lower end, 55: piston, G
... the basics.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16F 9/02 F16F 9/02 9/10 9/10 15/02 15/02 L

Claims (7)

[Claims] 1. 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, the seismic isolation structure comprising: a support base 1 having a curved bottom 3; A vertical shaft 7 provided integrally with the support so that the spherical shaft 8 protrudes from the upper end surface 5 of the support, and a curved bearing surface 12 which slides on the spherical shaft 8 of the vertical shaft 7. , A support plate 20 provided on the vertical shaft 7 through a center hole 22 so as to be able to support the seal bearing 11, and the seal bearing 11 And a pressure medium storage chamber 33 formed at the lower end 31 of the upper structure 30. When the sideways rolling occurs, tilt around the spherical shaft 8 A seismic isolation structure for upper structures, such as buildings, columns, and roads, that rotate. 2. The pressure medium storage chamber 33 according to claim 1,
The inner wall surface of is formed in a spherical shape facing the spherical shaft portion 8 via the pressure medium 35, and is a seismic isolation structure for an upper structure such as a building, a pillar, or a road. 3. The seismic isolation structure for an upper structure such as a building, a support, a road, and the like, wherein the pressure medium 35 is a liquid having a high viscosity. 4. 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 first vertical structure laid on the foundation G. A support 1A which is installed via the shaking vibration absorbing means 45 and has a curved bottom 3A, and a spherical shaft 8 from an upper end surface 5 of the support.
Vertical shaft 7 integrally provided on the support base so that
And a cylindrical seal bearing 11 having a curved bearing surface 12 slidably in contact with the spherical shaft portion 8 of the vertical shaft 7, and a center hole formed in the vertical shaft 7 so that the seal bearing 11 can be supported. A support plate 20 provided with a lower end 22A and an upper structure 30A integrally attached with a lower end 31A so as to press the seal bearing 11 against the support plate 20.
And a pressure medium storage chamber 33 formed at the lower end 31A of the upper structure 30A.
When an earthquake rolls, a building, a column, a road, or the like, which moves in the same direction together with the first pitch vibration absorbing means 45 and tilts and rotates around the spherical shaft portion 8. Seismic isolation structure of the upper structure. 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 includes a support 1A having a curved bottom 3A. A vertical shaft 7 provided integrally with the support so that the spherical shaft 8 protrudes from the upper end surface 5 of the support, and a curved bearing surface 12 which slides on the spherical shaft 8 of the vertical shaft 7. , A support plate 20 provided on the vertical shaft 7 through a center hole 22 so as to be able to support the seal bearing 11, and the seal bearing 11 An upper structure 30A having a lower end 31A integrally attached thereto so as to press down and having a pitching vibration absorbing means 47, and a pressure medium storage chamber 33 formed in the lower end 31A of the upper structure 30A. And the support 1 comprises an earthquake A seismic isolation structure for an upper structure such as a building, a support, a road, and the like, which tilts and rotates about a spherical shaft portion 8 when a roll occurs. 6. In 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, the seismic isolation structure includes a support 1B having a curved bottom 3; A vertical shaft 7B provided integrally with the support so that the spherical shaft portion 8B protrudes from the upper end surface 5 of the support;
A cylindrical seal bearing 11B having a curved bearing surface 12 slidingly contacting the spherical shaft portion 8B;
B provided on the vertical shaft 7B through a center hole 22 so as to be able to support
0 so that the lower end 3 is pressed against the seal bearing 11B.
1 comprises an upper structure 30 integrally attached thereto, and a pressure medium storage chamber 33B formed at the lower end portion 31B of the upper structure 30. The pressure medium storage chamber 33B has a compressible pressure medium 35B. And the support table 1
B shows the spherical shaft 8B when the earthquake rolls.
A seismic isolation structure for buildings, supports, roads, and other superstructures that tilt and rotate around the center. 7. In 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, the seismic isolation structure includes a support 1C having a curved bottom 3; A vertical shaft 7 provided integrally with the support so that the spherical shaft 8 protrudes from the upper end surface 5 of the support, and a curved bearing surface 12 which slides on the spherical shaft 8 of the vertical shaft 7. , A support plate 20 provided on the vertical shaft 7 through a center hole 22 so as to be able to support the seal bearing 11, and the seal bearing 11 Upper structure 30C having a lower end 31C integrally attached thereto so as to press the upper structure 30C.
The upper structure 30C is formed integrally with the lower end 31C and the lower end 31C, and the vibration absorber storage chamber 52 is formed. And a heavy object 51 such as a building or a support having an insertion lower end 54 in which a pin ton 55 is slidably fitted into the vibration absorber storage chamber 52 of the cylinder upper end 50. The support 1C tilts and rotates around the spherical shaft portion 8 in the event of a roll of earthquake,
Seismic isolation structure for upper structures such as columns and roads.