JP2000129954A - Three-dimensional base isolation structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a three-dimensional base isolation structure capable of improving the base isolation function in the horizontal direction and in the perpendicular direction by freely setting each spring rigidity according to the weight and the horizontal force of a structure to be applied to a base isolation mechanism in the perpendicular direction and a base isolation mechanism in the horizontal direction. SOLUTION: An intermediate beam 14 is provided between a lowest beam 10 and a foundation 12, and a base isolation mechanism 16 in the perpendicular direction to support the weight of a structure above the lowest beam 10 is provided between the lowest beam 10 and the intermediate beam 14. A base isolation mechanism 18 in the horizontal direction to support the weight of the structure and the weight of the intermediate beam 14 is provided between the intermediate beam 14 and the foundation 12. A guide means 20 to prevent the relative movement in the horizontal direction while permitting the relative movement in the perpendicular direction between the two is provided between the lowest beam 10 and the intermediate beam 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional seismic isolation structure for horizontally and vertically isolating a structure constructed with columns and beams on a foundation.

[0002]

2. Description of the Related Art A three-dimensional seismic isolation structure of this kind is disclosed, for example, in Japanese Patent No. 2713100 (registered October 31, 1997, Int.
As is known from Cl.E04H 9/02), it has a vertical seismic isolation mechanism and a horizontal seismic isolation mechanism, absorbs vertical vibration by the vertical seismic isolation mechanism, and horizontal vibrations by the horizontal seismic isolation mechanism Absorbs the three-dimensional seismic isolation.

Incidentally, a laminated rubber is used as the horizontal seismic isolation mechanism. The laminated rubber is formed by alternately laminating a rubber layer and a steel plate layer, and supports the vertical load of the sprung structure. Allow horizontal displacement. The laminated rubber performs horizontal seismic isolation against an earthquake by making the horizontal natural period of the structure longer by utilizing small horizontal rigidity.

[0004]

However, in such a conventional three-dimensional seismic isolation structure, the weight of the structure acts as it is on the laminated rubber used as the horizontal seismic isolation mechanism. Inevitably, the spring stiffness of the laminated rubber itself becomes large corresponding to the weight of the structure. In addition, since it is necessary to use a laminated rubber having a large diameter according to the amount of deformation in the horizontal direction, the spring rigidity of the laminated rubber itself also becomes large from this viewpoint. As described above, when the laminated rubber having increased spring stiffness is used, and when the structure is relatively lightweight with respect to the horizontal spring component of the laminated rubber, the weight of the structure and the spring constant of the laminated rubber are compared. Due to the relationship, the natural period is set short. For this reason, in order to obtain an effective seismic isolation function, it is necessary to increase the weight of the structure to secure a longer period.

On the other hand, it is necessary for the vertical seismic isolation mechanism to support the excessive weight of the structure while allowing vertical displacement, and it is generally considered to use a coil spring. In this case, since the coil spring is required to have a predetermined vertical deformation amount, the smaller the weight of the structure, the easier it is to secure the deformation amount and the longer the cycle.

In other words, while the laminated rubber requires a certain large supporting load in order to prolong the period, it is necessary for the coil spring to exert its function properly without exerting an excessive weight on the coil spring. The smaller the supporting load, the better.

On the other hand, in the above-described conventional three-dimensional seismic isolation structure, the weight to be applied to the laminated rubber and the coil spring is not properly considered, but two laminated rubbers are simply arranged above and below the coil spring. It's just When the laminated rubber and the coil spring are directly connected and arranged in series in this manner, the same structural weight acts on the laminated rubber and the coil spring. For this reason, when the structure weight is set corresponding to the laminated rubber, the coil spring may not be able to function properly. There has been a problem that the long period in the horizontal direction due to rubber cannot be sufficiently achieved.

Accordingly, the present invention has been made in view of such a conventional problem, and the spring stiffness of each of the structures depends on the weight and horizontal force of the structure acting on the vertical seismic isolation mechanism and the horizontal seismic isolation mechanism. It is an object of the present invention to provide a three-dimensional seismic isolation structure capable of improving the horizontal and vertical seismic isolation functions.

[0009]

In order to achieve the above object, a three-dimensional seismic isolation structure according to a first aspect of the present invention is to provide an intermediate beam between a lowermost beam and a foundation. A vertical seismic isolation mechanism is provided between the intermediate beam and the foundation to support the weight of the structure above the lowermost beam and to isolate the vertical vibrations. A horizontal seismic isolation mechanism for supporting the object weight and the intermediate beam weight and isolating horizontal vibration is provided, and the vertical relative movement between the lowermost beam and the intermediate beam is allowed between the lowermost beam and the intermediate beam. Guide means for preventing relative movement in the horizontal direction while performing the movement.

In the three-dimensional seismic isolation structure according to a second aspect of the present invention, the horizontal seismic isolation mechanism is disposed immediately below the vertical seismic isolation mechanism.

In the three-dimensional seismic isolation structure according to a third aspect of the present invention, a plurality of the horizontal seismic isolation mechanisms are provided at an arbitrary position between the intermediate beam and the foundation.

Further, in the three-dimensional seismic isolation structure according to a fourth aspect of the present invention, the vertical vibration is isolated between the lowermost beam and the foundation while supporting the weight of the structure above the lowermost beam. A vertical seismic isolation mechanism, and a horizontal seismic isolation mechanism arranged in parallel with the vertical seismic isolation mechanism to isolate horizontal vibration are provided, and at least one of the lowermost beam and the foundation. Guide means is provided between the horizontal seismic isolation mechanism to prevent horizontal relative movement while allowing both the lowermost beam and the foundation to move in the vertical direction, and at least one of the lowermost beam and the foundation. A sliding means is provided between one of them and the vertical seismic isolation mechanism to allow the lowermost beam and the foundation to move relative to each other in the horizontal direction.

Further, in the three-dimensional seismic isolation structure according to a fifth aspect of the present invention, the vertical seismic isolation mechanism is disposed immediately below a column of the structure.

According to the first aspect of the present invention, the operation of the present invention will be described below. In claim 1, the vertical seismic isolation mechanism provided between the lowermost beam and the intermediate beam provides seismic isolation in the vertical direction.
Horizontal seismic isolation can be achieved by the horizontal seismic isolation mechanism provided between the intermediate beam and the foundation. At this time, between the lower beam and the intermediate beam where the vertical seismic isolation mechanism is provided,
Since the guide means for blocking the relative movement in the horizontal direction while permitting the relative movement in the vertical direction is provided, only the vertical displacement is input to the vertical seismic isolation mechanism. It is possible to prevent the directional seismic isolation mechanism from being damaged or the performance from being degraded.

Here, the structure weight up to the lowest beam acts on the vertical seismic isolation mechanism, but the horizontal seismic isolation mechanism further adds to the structural weight acting on the vertical seismic isolation mechanism. The weight of the intermediate beam will be added. For this reason, by adjusting the weight of the added intermediate beam in advance, the weight acting on the horizontal seismic isolation mechanism can be increased even in a light-weight structure. The structure above can include the intermediate beam, and the structure above can appropriately have a longer period. On the other hand, since the vertical seismic isolation mechanism can exert its function appropriately by reducing the weight acting on the mechanism, the seismic isolation function against vertical vibration can be sufficiently ensured.

The horizontal seismic isolation mechanism only needs to have a number that supports the weight acting on the intermediate beam. Therefore, by reducing the number of the horizontal seismic isolation mechanisms to be installed, each horizontal seismic isolation mechanism can be provided. Since the weight acting on the directional seismic isolation mechanism can be increased, a longer period can be achieved without increasing the weight of the intermediate beam.

According to the second aspect of the present invention, the horizontal seismic isolation mechanism is disposed immediately below the vertical seismic isolation mechanism. Therefore, the weight of the structure acting on the vertical seismic isolation mechanism is reduced below the vertical seismic isolation mechanism. It can be supported by the horizontal seismic isolation mechanism. In other words, if the vertical seismic isolation mechanism and the horizontal seismic isolation mechanism are displaced in the horizontal direction, a bending moment with a span equal to the horizontal distance between the vertical seismic isolation mechanism and the horizontal seismic isolation mechanism is generated at the intermediate beam. However, according to the above configuration, such a bending moment does not occur. Therefore, it is not necessary to particularly increase the strength of the intermediate beam, and the cost of the intermediate beam can be reduced.

According to the third aspect, the presence of the intermediate beam allows
It is possible to arbitrarily select the horizontal seismic isolation mechanism that has the required horizontal rigidity, and the installation position and number of them can be arbitrarily selected. Can be adjusted freely.

Further, in the present invention, a vertical seismic isolation mechanism for supporting the weight of a structure above the lowermost beam and the foundation are arranged in parallel with the vertical seismic isolation mechanism. With the horizontal seismic isolation mechanism, the vertical seismic isolation mechanism allows vertical seismic isolation, and the horizontal seismic isolation mechanism allows horizontal seismic isolation. At this time, since the vertical seismic isolation mechanism and the horizontal seismic isolation mechanism are arranged in parallel between the lowermost beam and the foundation, the space under the lowermost beam for forming the three-dimensional seismic isolation structure is small. I can do it.

Further, since the vertical seismic isolation mechanism and the horizontal seismic isolation mechanism are arranged in parallel, the vertical load of the structure can be supported by the vertical seismic isolation mechanism and flow to the foundation. For this reason, no vertical load acts on the horizontal seismic isolation mechanism, so the horizontal seismic isolation mechanism can be designed taking into account only the horizontal spring stiffness, and it is easy to secure a longer period of the structure. And the performance of the horizontal seismic isolation mechanism can be stabilized up to the large deformation region.

Further, between at least one of the lowermost beam and the foundation and the horizontal seismic isolation mechanism,
In addition to providing guide means for preventing horizontal relative movement while permitting vertical relative movement of both the lowermost beam and the foundation, at least one of the lowermost beam and the foundation and the vertical seismic isolation mechanism are provided. In the meantime, by providing a sliding means for allowing the horizontal movement of both the bottom beam and the foundation in the horizontal direction, only vertical displacement is input to the vertical seismic isolation mechanism, and the vertical seismic isolation mechanism is damaged. Can be prevented. Therefore, even if the horizontal seismic isolation mechanism breaks due to excessive vibration input, the vertical seismic isolation mechanism can reliably maintain the gap between the bottom beam and the foundation, exhibiting a so-called fail-safe function. Can be done.

Furthermore, in the present invention, the vertical seismic isolation mechanism is disposed immediately below the column of the structure, so that the weight of the structure acting via the column is directly reduced by the vertical seismic isolation mechanism. Can be supported. For this reason, generation of an unnecessary bending moment in the lowermost beam can be prevented, and the weight of the structure on the vertical seismic isolation mechanism can be reduced.

[0023]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 3 show one embodiment of the three-dimensional seismic isolation structure of the present invention, FIG. 1 is a front sectional view showing a main part of the three-dimensional seismic isolation structure, and FIG. 2 is an enlarged front view of part A in FIG. FIG. 3 is a sectional view taken along line BB in FIG.

The basic configuration of the three-dimensional seismic isolation structure of the present embodiment is as shown in FIG. 1, in which an intermediate beam 14 is provided between a lowermost beam 10 and a foundation 12, and the lowermost beam 10 and the intermediate beam 14 are provided. And a vertical seismic isolation mechanism 16 for supporting the weight of a structure (not shown) above the lowermost beam 10, and the weight of the structure and the weight of the structure between the intermediate beam 14 and the foundation 12. A horizontal seismic isolation mechanism 18 that supports the weight of the intermediate beam 14 is provided, and between the lowermost beam 10 and the intermediate beam 14, horizontal relative movement is prevented while allowing vertical relative movement of both. Guide means 20 are provided.

The lowermost beam 10 is formed as an S beam using H-shaped steel, and a column 22 is erected above the lowermost beam 10. The foundation 12 is constructed as an RC structure by casting concrete. Further, the intermediate beam 14 is R
Although it is configured as a C beam, the intermediate beam 14 is provided in a floating state without being fixed to the skeleton side.

The vertical seismic isolation mechanism 16 is disposed immediately below the column 22, and has a liner plate 24 for deformation adjustment attached to the lower flange 10 a of the lowermost beam 10.
Mounting plate 26 mounted on the upper surface of intermediate beam 14
Between the inner and outer coil springs 28, 30
Are contracted. The inner and outer coil springs 28, 30 are formed such that the inner coil spring 28 is formed to have a small diameter, while the outer coil spring 30 is formed to have a large diameter. It is set to oppose the weight of the structure acting on the two vertical seismic isolation mechanisms 16.

A tubular cover 32 surrounding the outside of the outer coil spring 30 is vertically suspended from the liner plate 24, and a temporary fixing bolt 34 is erected from the mounting plate 26. Cover 32
The arm 32a protruding from the hole can be inserted to fix the nut. The vertical seismic isolation mechanism 16
At the time of mounting, the cover 32 is fixed to the temporary fixing bolts 34 with the inner and outer coil springs 28 and 30 compressed and tightened, and the nut is removed after the mounting is completed. On the other hand, it can freely move up and down.

The horizontal seismic isolation mechanism 18 is formed as a laminated rubber in which an internal rubber layer 38 and an internal steel plate 40 are laminated between upper and lower flanges 36 and 36a, and a coating rubber 42 is provided on the outer periphery. The upper flange 36 is fixed to the lower surface of the projection 14 a projecting from the lower surface of the intermediate beam 14 corresponding to the position directly below the vertical seismic isolation mechanism 16,
The lower flange 36a is fixed to the upper surface of the foundation 12.

Incidentally, depending on the case, the horizontal seismic isolation mechanism 18 may be provided at an arbitrary position between the intermediate beam 14 and the foundation 12 and in plural numbers. That is, the presence of the intermediate beam 14 allows the horizontal seismic isolation mechanism 18 having the required horizontal rigidity to be arbitrarily selected, and the installation position and number thereof to be arbitrarily selected. Eccentricity and deformation can be freely adjusted for seismic isolation performance.

The guide means 20 is provided at a position spaced apart from the vertical seismic isolation mechanism 16 in the horizontal direction by an appropriate distance L 1. The guide means 20 faces the longitudinal direction of the lowermost beam 10, and faces the lower surface of the lowermost beam 10. A pair of guide plates 44, 44a fixed to
And rollers 46, 46a fixed to the upper surface of the projecting portion 14b projecting from the upper surface of the intermediate beam 14 and rolling in contact with the guide plates 44, 44a, respectively.

As shown in FIGS. 2 and 3, angle materials are used for the guide plates 44 and 44a. Each of the guide plates 44 and 44a is opposed to each other in a parallel relationship with one side as a guide surface, and the other side is used as a mounting portion with the other side as a mounting portion. Lower beam 10
Is fixed to the lower surface of the device by bolts, nuts or welding (not shown).

On the other hand, the rollers 46, 46a are provided on mounting walls 48, 48a projecting from a mounting plate 47 fixed to the projection 14b. These mounting walls 4
8, 48a are the guide plates 44, 4 as shown in FIG.
The rollers 46, 46a are provided two by two on the mounting walls 48, 48a to secure stability.

Although the guide means 20 is not shown, a cylindrical guide is attached to the lower surface of the lowermost beam 10 instead of the pair of guide plates 44, 44a, and a plurality of guides are provided along the inner peripheral surface. A configuration in which rollers are arranged may be adopted.

With the above configuration, in the three-dimensional seismic isolation structure of this embodiment, the vertical seismic isolation mechanism 16 and the horizontal seismic isolation mechanism 18 extend in the direction in which the column 22 extends with the intermediate beam 14 interposed therebetween. Seismic isolation is provided in the vertical direction by a vertical seismic isolation mechanism 16 provided between the lowermost beam 10 and the intermediate beam 14, and a horizontal seismic isolation mechanism provided between the intermediate beam 14 and the foundation 12. By isolating in the horizontal direction by 18, so-called three-dimensional seismic isolation becomes possible.

At this time, the guide means 20 provided between the lowermost beam 10 and the intermediate beam 14 includes a guide plate 44, 44a fixed to the lowermost beam 10 and rollers 46, 46a attached to the intermediate beam 14. The lowermost beam 10 and the intermediate beam 14 are brought into contact with each other.
With respect to the horizontal direction. In the vertical direction, rollers 46, 46a are provided with guide plates 44,
Rolling 44a allows vertical relative displacement between the lowermost beam 10 and the intermediate beam 14 to enable the outer coil springs 28 and 30 of the vertical seismic isolation mechanism 16 to be elastically deformed in the vertical direction. Thus, the vertical vibration is isolated.

As described above, since the horizontal load is prevented from acting on the inner and outer coil springs 28 and 30 by the guide means 20, the inner and outer coil springs 28 and 30 are damaged by a large horizontal displacement. Or the performance of the vertical seismic isolation can be prevented.

Here, since the vertical seismic isolation mechanism 16 is disposed above the intermediate beam 14, the vertical seismic isolation mechanism 1
While the structure weight up to the lowest beam 10 acts on 6,
The horizontal seismic isolation mechanism 18 includes the vertical seismic isolation mechanism 16.
The weight of the intermediate beam 14 will be added to the weight of the structure acting on. The intermediate beam 14 is configured as an RC beam, and its weight is adjustable.

Therefore, even when the structure constructed on the lowermost beam 10 is lightweight, the weight acting on the horizontal seismic isolation mechanism 18 can be increased by the intermediate beam 14, so that the horizontal direction With the support by the seismic isolation mechanism 18, the upper structure including the intermediate beam 14 can be appropriately made longer in period, and the horizontal seismic isolation function can be improved.

On the other hand, although the weight acting on the horizontal seismic isolation mechanism 18 is increased by the intermediate beam 14 and the period can be lengthened, the vertical seismic isolation mechanism 16 requires the weight of the intermediate beam 14. Since it does not act, the weight acting on the inner and outer springs 28, 30 of the vertical seismic isolation mechanism 16 can be made relatively small so that the function can be properly exerted. A sufficient seismic isolation function can be secured.

Further, it is not necessary to provide the same number of horizontal seismic isolation mechanisms 18 corresponding to the vertical seismic isolation mechanisms 16, and it is sufficient that the horizontal seismic isolation mechanisms 18 have a number that supports the weight acting on the intermediate beams 14. Therefore, by making the horizontal seismic isolation mechanism 18 smaller in number than the vertical seismic isolation mechanism 16, the weight acting on each horizontal seismic isolation mechanism 18 can be increased, so that the weight of the intermediate beam 14 is increased. No, that is,
A longer period can be achieved while reducing the amount of concrete used for the intermediate beam 14. Needless to say, even when the amount of concrete is reduced, the intermediate beam 14 has a predetermined rigidity.

Further, in this embodiment, the horizontal seismic isolation mechanism 1 is used.
8 in the same number as the vertical seismic isolation mechanism 16, or
Regardless of the number, the horizontal seismic isolation system 18
Are disposed directly below the vertical seismic isolation mechanism 16, the weight of the structure acting on the vertical seismic isolation mechanism 16 can be supported by the horizontal seismic isolation mechanism 18 vertically below. That is, when the vertical seismic isolation mechanism 16 and the horizontal seismic isolation mechanism 18 are displaced in the horizontal direction, the horizontal distance between the vertical seismic isolation mechanism 16 and the horizontal seismic isolation mechanism 18 is set to the span of the intermediate beam 14. However, according to the above configuration, such a bending moment does not occur. Therefore, it is not necessary to particularly increase the strength of the intermediate beam 14, and the construction cost of the intermediate beam 14 can be reduced.

Further, the vertical seismic isolation mechanism 16 is
Since it is arranged immediately below the column 22 connected to the lowest beam 10, the weight of the structure acting via the column 22 can be directly supported by the vertical seismic isolation mechanism 16. For this reason, generation of an unnecessary bending moment in the lowermost beam 10 can be prevented, and the weight of the structure on the vertical seismic isolation mechanism 16 can be reduced.

Although the lowermost beam 10 is formed as an S beam, the present invention is not limited to this, and it can be formed as an RC beam or an SRC beam. Also, the intermediate beam 14
Is RC beam, but even in this case, S beam or SR
It can be a C beam.

FIG. 4 is a front sectional view showing a main part of a three-dimensional seismic isolation structure according to another embodiment. The same components as those in the above embodiment are denoted by the same reference numerals, and redundant description will be omitted.

As shown in the figure, the basic configuration of the three-dimensional seismic isolation structure of this embodiment is such that a vertical structure for supporting the weight of the structure above the lowest beam 10 between the lowest beam 10 and the foundation 12. Directional seismic isolation mechanism 16, and horizontal seismic isolation mechanism 18 that is disposed at an appropriate distance in the horizontal direction from vertical seismic isolation mechanism 16.
And the horizontal seismic isolation mechanism 18 and the lowermost beam 1
0, a guide means 20 for preventing the relative movement in the horizontal direction while allowing the relative movement in the vertical direction is provided, and between the vertical seismic isolation mechanism 16 and the foundation 12 in the horizontal direction. A sliding mechanism 50 that allows relative movement is provided.

The lowermost beam 10 and the foundation 12 are constructed as S beams using H-section steel, and the foundation 12 is formed by casting concrete and RC It is built as a structure. In addition, a column 22 is erected above the lowermost beam 10. Further, the vertical seismic isolation mechanism 16, the horizontal seismic isolation mechanism 18, and the guide means 20 have the same structure as that of the above-described embodiment, and thus detailed description thereof will be omitted.

The sliding mechanism 50 is provided with a sliding plate 52 made of stainless steel or the like on the upper surface of the foundation 12 corresponding to the position of the vertical seismic isolation mechanism 16, and the mounting plate 26 of the vertical seismic isolation mechanism 16. A back plate 54 provided with a Teflon sliding surface on the lower surface is attached, and the back plate 54 is slidably mounted on the upper surface of the sliding plate plate 52. Of course, the sliding plate 52 is formed with an area enough to cover the movement of the back plate 54.

That is, in the three-dimensional seismic isolation structure of this embodiment, the vertical seismic isolation mechanism 16 and the horizontal seismic isolation mechanism 18 are provided with an appropriate space L2 in the horizontal direction between the bottom beam 10 and the foundation 12. Provided and arranged in parallel, the vertical seismic isolation mechanism 16
The outer and upper coil springs 28 and 30 are vertically deformed to be seismically isolated vertically, and the sliding mechanism 50
Accordingly, the horizontal seismic isolation mechanism 18 can be horizontally deformed by horizontally deforming the horizontal seismic isolation mechanism 18 while allowing the relative movement between the vertical seismic isolation mechanism 16 and the foundation 12.

Since the vertical seismic isolation mechanism 16 and the horizontal seismic isolation mechanism 18 are arranged in parallel at the same level between the lowermost beam 10 and the foundation 12, a three-dimensional seismic isolation structure is formed. The space beneath the lowermost beam 10 is smaller than in the above embodiment.

Further, since the vertical seismic isolation mechanism 16 and the horizontal seismic isolation mechanism 18 are arranged in parallel, the vertical load of the structure can be exclusively supported by the vertical seismic isolation mechanism 16 and flow to the foundation 12. it can. For this reason, since the vertical seismic isolation mechanism 18 does not act on the vertical load, the horizontal seismic isolation mechanism 18 can be designed in consideration of only the spring stiffness in the horizontal direction. Can be secured.

Further, when no vertical load is applied to the horizontal seismic isolation mechanism 18 in this way, the horizontal seismic isolation mechanism 18 does not need to be constituted by the laminated rubber shown in FIG. A device provided, for example, a simple rubber body, can be configured to further improve the horizontal seismic isolation effect. And even when the laminated rubber is used as in this embodiment, since the vertical load does not act, the deformation performance of the laminated rubber is expanded.

The horizontal seismic isolation mechanism 18 and the lowest beam 1
0, and the vertical seismic isolation mechanism 16 can be exclusively input to the vertical displacement by the sliding mechanism 50 provided between the vertical seismic isolation mechanism 16 and the foundation 12. Therefore, the vertical seismic isolation mechanism 16,
That is, the inner and outer coil springs 28 and 30 are always kept in an upright state, and can be prevented from being damaged. Therefore, even when the horizontal seismic isolation mechanism 18 is greatly deformed and broken by the input of excessive vibration, the lowermost beam 10 and the foundation 1
2 can be reliably maintained by the vertical seismic isolation mechanism 16, so that a so-called fail-safe function can be exhibited.

By the way, even in this embodiment, the vertical seismic isolation mechanism 16 is disposed immediately below the column 22 connected to the lowermost beam 10, so that the bending moment is generated in the lowermost beam 10. Thus, the weight of the lowermost beam 10 can be reduced.

In this embodiment, the guide means 20
Is disposed between the horizontal seismic isolation mechanism 18 and the foundation 12,
Further, the same function can be achieved even if the sliding mechanism 50 is disposed between the vertical seismic isolation mechanism 16 and the lowest beam 10. Further, similarly to the above embodiment, the lowermost beam 10 is
But it is not limited to this, RC beam or SRC
It can be configured as a beam.

In any of the above embodiments,
The three-dimensional seismic isolation structure can effectively perform three-dimensional seismic isolation in all directions along the horizontal plane.

[0056]

As described above, in the three-dimensional seismic isolation structure according to the first aspect of the present invention, the vertical seismic isolation mechanism provided between the lowermost beam and the intermediate beam provides vertical isolation. While seismic, the horizontal seismic isolation mechanism provided between the intermediate beam and the foundation allows horizontal seismic isolation, and the vertical relative movement between the bottom beam and the intermediate beam. The vertical seismic isolation mechanism can be exclusively input with vertical displacement because the guide means that prevents horizontal relative movement while allowing horizontal movement can damage the vertical seismic isolation mechanism due to horizontal displacement. , And performance can be prevented from being reduced.

Further, since the horizontal seismic isolation mechanism operates by adding the weight of the intermediate beam to the weight of the structure acting on the vertical seismic isolation mechanism, the weight of the added intermediate beam is adjusted in advance. By doing so, the weight acting on the horizontal seismic isolation mechanism can be increased even in the case of a lightweight structure, and the upper structure including the intermediate beam can be appropriately extended by the support by the horizontal seismic isolation mechanism. While the period can be lengthened, the vertical seismic isolation mechanism can exert its function appropriately by reducing the weight acting on the mechanism, so that the seismic isolation function against vertical vibration can be sufficiently ensured.

Furthermore, it is possible to adjust the number of horizontal seismic isolation mechanisms to be installed, thereby increasing the weight acting on the horizontal seismic isolation mechanisms and increasing the period without increasing the weight of the intermediate beams. Can be achieved.

Further, in the three-dimensional seismic isolation structure according to claim 2 of the present invention, the horizontal seismic isolation mechanism is disposed immediately below the vertical seismic isolation mechanism. The horizontal seismic isolation mechanism can support the weight of the structure acting on the intermediate beam vertically below it, thereby preventing generation of an unnecessary bending moment on the intermediate beam. Therefore, it is not necessary to increase the strength of the intermediate beam, and the cost of the intermediate beam can be reduced.

In the three-dimensional seismic isolation structure according to claim 3 of the present invention, a plurality of the horizontal seismic isolation mechanisms are provided at an arbitrary position between the intermediate beam and the foundation. Arbitrarily select the horizontal seismic isolation mechanism with the required horizontal rigidity, and arbitrarily select the installation position and number of them, and freely control the eccentricity and deformation of the horizontal seismic isolation part. Can be adjusted.

Further, in the three-dimensional seismic isolation structure according to claim 4 of the present invention, a vertical seismic isolation mechanism for supporting the weight of a structure above the lowermost beam between the lowermost beam and the foundation. And a horizontal seismic isolation mechanism arranged in parallel with the vertical seismic isolation mechanism, so that the vertical seismic isolation mechanism allows vertical seismic isolation and the horizontal seismic isolation mechanism allows horizontal seismic isolation. can do. At this time, the vertical seismic isolation mechanism and the horizontal seismic isolation mechanism are arranged in parallel between the lowermost beam and the foundation, so the space under the lowermost beam for forming the three-dimensional seismic isolation structure is small. I can do it.

Further, by arranging the vertical seismic isolation mechanism and the horizontal seismic isolation mechanism in parallel, the vertical load of the structure can be exclusively supported by the vertical seismic isolation mechanism and flow to the foundation. For this reason, no vertical load acts on the horizontal seismic isolation mechanism, so the horizontal seismic isolation mechanism can be designed taking into account only the horizontal spring stiffness, and it is easy to secure a longer period of the structure. And the performance of the horizontal seismic isolation mechanism can be stabilized up to the large deformation region.

Further, between at least one of the lowermost beam and the foundation and the horizontal seismic isolation mechanism,
In addition to providing guide means for preventing horizontal relative movement while permitting vertical relative movement of both the lowermost beam and the foundation, at least one of the lowermost beam and the foundation and the vertical seismic isolation mechanism are provided. In the meantime, by providing a sliding means for allowing the horizontal movement of both the bottom beam and the foundation in the horizontal direction, only vertical displacement is input to the vertical seismic isolation mechanism, and the vertical seismic isolation mechanism is damaged. Can be prevented. Therefore, even if the horizontal seismic isolation mechanism breaks due to excessive vibration input, the vertical seismic isolation mechanism can reliably maintain the gap between the bottom beam and the foundation, exhibiting a so-called fail-safe function. Can be done.

Further, in the three-dimensional seismic isolation structure according to the fifth aspect of the present invention, the vertical seismic isolation mechanism is disposed immediately below the column of the structure, so that it operates via the column. The weight of the structure can be supported directly by the vertical seismic isolation mechanism. For this reason, generation of an unnecessary bending moment in the lowermost beam can be prevented, and the weight of the structure on the vertical seismic isolation mechanism can be reduced.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a main part showing an embodiment of a three-dimensional seismic isolation structure of the present invention.

FIG. 2 is an enlarged front view of a portion A in FIG.

FIG. 3 is a sectional view taken along line BB in FIG. 2;

FIG. 4 is a front sectional view of a main part showing another embodiment of the three-dimensional seismic isolation structure of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Lowermost beam 12 Foundation 14 Intermediate beam 16 Vertical seismic isolation mechanism 18 Horizontal seismic isolation mechanism 20 Guide means 22 Column 50 Sliding mechanism

Claims (5)

[Claims] An intermediate beam is provided between a lowermost beam and a foundation,
A vertical seismic isolation mechanism is provided between the lowermost beam and the intermediate beam to support vertical structure isolation while supporting the weight of the structure above the lowermost beam. A horizontal seismic isolation mechanism is provided between the lowermost beam and the intermediate beam between the lowermost beam and the intermediate beam to provide a horizontal seismic isolation mechanism that supports the weight of the structure and the weight of the intermediate beam and supports horizontal vibration. A three-dimensional seismic isolation structure characterized by providing guide means for preventing relative movement in the horizontal direction while allowing relative movement in the direction. 2. The three-dimensional seismic isolation structure according to claim 1, wherein the horizontal seismic isolation mechanism is disposed immediately below the vertical seismic isolation mechanism. 3. The three-dimensional seismic isolation structure according to claim 1, wherein a plurality of the horizontal seismic isolation mechanisms are provided at an arbitrary position between the intermediate beam and the foundation. 4. A vertical seismic isolation mechanism between a foundation beam and a foundation for supporting vertical structural vibration while supporting the weight of a structure above the foundation beam, and a parallel with the vertical seismic isolation mechanism. And a horizontal seismic isolation mechanism that is disposed on the horizontal seismic isolation mechanism for isolating horizontal vibrations, and between the horizontal seismic isolation mechanism and at least one of the lowermost beam and the foundation. And guide means for preventing horizontal relative movement while allowing vertical relative movement of both the foundation and
A tertiary characterized in that a sliding means is provided between at least one of the lowermost beam and the foundation and the vertical seismic isolation mechanism to permit horizontal relative movement of both the lowermost beam and the foundation. Former seismic isolation structure. 5. The vertical seismic isolation mechanism is disposed immediately below a column of the structure.
A three-dimensional seismic isolation structure according to any of the above items.