JP2000080819A - Fitting structure for base isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fitting structure for a base isolation device which can downsize the cross-sectional dimensions of a base isolation device such as a laminated rubber and can effectively provide a base isolation performance. SOLUTION: A base isolation device 10 is constituted in such a way that it is fitted to the pillar C of a structure A through a fitting member 12, and the fitting member 12 comprises fitting plates 15 fixed to the pillar C and extension parts 16 smaller in diameter than the base isolation part 4, and the respective fitting plates 15 are fixed by anchor bolts 18 on the outer circumferential side of the extension part 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation device mounting structure suitable for use when a seismic isolation device such as a laminated rubber is incorporated into a pillar or the like.

[0002]

2. Description of the Related Art In recent years, various seismic isolation devices have been developed for various structures, such as buildings, in order to minimize shaking during an earthquake and the damage caused thereby. As this seismic isolation device, a so-called laminated rubber having a structure in which an elastic body or a viscoelastic body and a steel plate are alternately laminated in the vertical direction is frequently used.

[0003] The laminated rubber is installed, for example, between a foundation of a structure and a main body of the structure constructed on the foundation.
As shown in FIG. 4, the laminated rubber 1 includes a viscoelastic body 2 and a steel plate 3.
An upper plate 5A and a lower plate 5B having a plate-like shape and having substantially the same diameter as the seismic isolation unit 4 are provided above and below the seismic isolation unit 4 on which are laminated. The upper plate 5A and the lower plate 5B are respectively provided. A flange plate 6 having a predetermined diameter larger than that of the flange plate 6 is integrally provided by bolts 7 or the like. And
The laminated rubber 1 has upper and lower flange plates 6
The outer peripheral portion of the upper plate 5A and the lower plate 5B is fixed to the structure A via the anchor member 8.

[0004] In such a laminated rubber 1, when a large external force in the horizontal direction is input due to an earthquake or the like, the viscoelastic body 2 is deformed in the horizontal direction to attenuate the external force and suppress the swing of the structure A. It has become.

[0005]

However, the conventional structure for mounting a seismic isolation device as described above has the following problems. That is, in the laminated rubber 1, the flange plate 6 is the largest diameter portion in the laminated rubber 1, and it is needless to say that the diameter of the laminated rubber 1 is smaller than that of the portion in which the flange is to be incorporated. However, for example,
When incorporated between a part of a pillar, a pillar and a floor slab, a foundation pile and a foundation slab, etc., the diameter of the flange plate 6 of the laminated rubber 1 is determined by the cross-sectional dimension of an elongated member such as a pillar or a pile. At the same time, it may not be possible to secure the minimum required diameter of the seismic isolation part 4 to obtain the predetermined seismic isolation performance.

In such a case, it is conceivable to enlarge the diameter of the columns and piles when the structure is newly constructed. However, this requires a large-sized laminated rubber 1 and an increase in the cross-sectional area of the columns and piles. There is a problem that it causes a rise and a reduction in indoor space. On the other hand, when the laminated rubber 1 is incorporated into an existing structure, it is impossible to increase the diameter of the columns and piles, and as a result, the diameter of the seismic isolation part 4 cannot be secured. There is a problem that it becomes impossible to obtain seismic performance.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and is intended to reduce the cross-sectional dimensions of a seismic isolation device such as a laminated rubber so as to obtain more effective seismic isolation performance. It is an object to provide a mounting structure for a seismic device.

[0008]

The invention according to claim 1 is
A mounting structure for a seismic isolation device to be incorporated into a structure, wherein the seismic isolation device is mounted on a mounting surface of the structure via a mounting member, and the mounting member includes a plate portion positioned parallel to the mounting surface. And a small diameter portion provided between the plate portion and the seismic isolation device and having a smaller cross-sectional dimension than the seismic isolation device, wherein the plate portion includes the plate portion. A fixing member for fixing to the mounting surface,
It is characterized in that the fixing is performed on the outer peripheral side of the small diameter portion.

[0009] Thus, since the small diameter portion has a smaller cross-sectional dimension than the seismic isolation device, the plate portion can have a cross-sectional size equal to or smaller than that of the seismic isolation device.

[0010] The invention according to claim 2 is the mounting structure of the seismic isolation device according to claim 1, wherein the small diameter portion is made of a steel pipe.

The invention according to claim 3 is the mounting structure of the seismic isolation device according to claim 2, characterized in that the steel pipe is filled with concrete.

According to a fourth aspect of the present invention, there is provided the seismic isolation device mounting structure according to any one of the first to third aspects, wherein an outer peripheral surface of the small-diameter portion extends to an outer peripheral side thereof, and It is characterized in that reinforcing ribs are integrally formed on the portion and the seismic isolation device, respectively.

In this way, the rigidity of the small-diameter portion can be increased without increasing the cross-sectional dimension by making the small-diameter portion a so-called filled steel pipe concrete structure or providing a reinforcing rib on the small-diameter portion.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a seismic isolation device mounting structure according to an embodiment of the present invention; FIG. Here, description will be made using an example in which the seismic isolation device is incorporated into a pillar, for example. In the following description, portions common to FIG. 4 shown as a conventional example are denoted by the same reference numerals.

FIG. 1 shows a part of a structure to which a structure for mounting a seismic isolation device according to the present invention is applied. In this figure, reference numeral A denotes a structure such as a building, and C denotes a structure. Columns 10 and 10 denote seismic isolation devices installed in the middle of column C, respectively. As shown in this figure, the seismic isolation device 10 is incorporated in a portion obtained by cutting the middle of a column C over a predetermined vertical length.

The seismic isolation device 10 is a so-called laminated rubber, and has a configuration in which an upper plate 5A and a lower plate 5B having a plate shape and having substantially the same diameter as the seismic isolation unit 4 are provided above and below the seismic isolation unit 4. Has become.

The seismic isolation part 4 has a structure in which the viscoelastic body 2 and the steel plate 3 are alternately stacked in a plurality of layers in the vertical direction. The viscoelastic body 2 includes, for example, natural rubber, rubber asphalt rubber, A high-damping rubber or the like having high damping performance is used. As the steel plate 3, for example, a vibration damping steel plate or the like is used in addition to a normal steel material.

The seismic isolation device 10 is provided with mounting members 12 above and below it, respectively.
Is attached to the column C via the. The mounting member 12 is
The seismic isolation part side plate 14 fixed to the upper plate 5A and the lower plate 5B, a mounting plate (plate member) 15 positioned in parallel to the mounting surface of the column C, and the seismic isolation part side plate part 14, And a small diameter portion 16 provided between the mounting plates 15.

The seismic isolation part side plate 14 has substantially the same diameter as the outer diameter of the seismic isolation part 4, and is provided with a plurality of bolts 17.
Are fixed integrally to the upper plate 5A and the lower plate 5B.

As shown in FIGS. 1 and 2, the mounting plate 15 has substantially the same diameter as the seismic isolation part 4, and has one end at a column C (FIG. 1).
(See FIG. 1), and is integrally fixed to the column C by a plurality of anchor bolts (fixing members) 18 fixed to the column C. At this time, each anchor bolt 18 is fixed to the mounting plate 15 on the outer peripheral side of the small diameter portion 16.

The small-diameter portion 16 has a smaller diameter than the seismic isolation portion 4 and the mounting plate 15, and the steel tube 1 forming the outer shell thereof is formed.
6a and concrete 16b filled in a steel pipe 16a
It is a filled steel pipe concrete structure consisting of:

Further, a rib plate (reinforcement rib) 19 extending radially toward the outer peripheral side is provided on the outer peripheral surface of the steel pipe 16a of the small diameter portion 16. As shown in FIG.
Each rib plate 19 has a three-sided edge formed by a steel pipe 16a.
, The base plate 14 and the mounting plate 1
5 and are integrally welded.

In such a seismic isolation device 10, when a horizontal external force is input due to an earthquake or the like, the upper part and the lower part of the seismic isolation device 10 are moved relative to the ends of the columns C in the horizontal direction. Displacement occurs. Then, upper plate 5A of seismic isolation part 4
And the lower plate 5B are respectively displaced integrally with the end C1 of the column C located above and the end C2 of the column C located below via the mounting member 12, and the upper plate 5A and the lower plate 5B , A horizontal relative displacement occurs. This relative displacement is transmitted to the seismic isolation part 4, and is attenuated by the deformation of each viscoelastic body 2, as a result, the relative displacement of the column C in the upper part and the lower part of the seismic isolation device 10 is attenuated, The swing of the structure A can be suppressed.

In the mounting structure of the seismic isolation device 10 described above, the seismic isolation device 10 is mounted on the column C of the structure A via the mounting member 12, and the mounting member 12 has an extension portion having a smaller diameter than the seismic isolation portion 4. The mounting plate 15 having the fixing member 16 has a structure in which an anchor bolt 18 is fixed on the outer peripheral side of the extension portion 16. As described above, the mounting plate 15 is made to have substantially the same diameter as the seismic isolation part 4 by the extension part 16 having a smaller diameter than the seismic isolation part 4.
As shown in FIG. 4, there is no protrusion on the outer peripheral side of the seismic isolation part 4. Therefore, when incorporating the seismic isolation device 10 into a portion having a small sectional size such as the column C, the sectional size of the seismic isolation part 4 can be maximized, so that sufficient seismic isolation performance can be obtained, as in the conventional case. In order to secure the cross-sectional dimension of the seismic isolation part 4, there is no need to increase the cross-sectional dimension of the column C, and effective use of space is not hindered. In particular, when the structure A is an existing structure, the conventional mounting structure as shown in FIG. 4 has a small cross-sectional dimension of a part to be incorporated, so that the laminated rubber 1 having sufficient seismic isolation performance can be obtained. It is possible to incorporate the seismic isolation device 10 including the seismic isolation part 4 having a larger cross-sectional dimension into a portion where the application of the seismic isolation device 4 is not possible, and the applicable range of the seismic isolation device 10 can be expanded.

The extension 16 of the mounting member 12 is a so-called filled steel pipe concrete structure in which a steel pipe 16a is filled with concrete 16b. Further, a rib plate 19 is provided on the outer peripheral portion of the extension portion 16. With these, the rigidity can be increased without increasing the cross-sectional dimension of the extension portion 16, and therefore,
The above effect can be further remarkable.

Further, the seismic isolation device 1 is attached via the mounting member 12.
In the future, the seismic isolation device 10
Can be replaced, or a type having a higher seismic isolation performance can be used. At that time, if the height of the mounting member 12 is changed, the height of the seismic isolation device itself can be changed.

In the above embodiment, the mounting member 12 is circular in plan view, but other shapes can be employed. For example, the attachment plate 15 and the extension 16 of the attachment member 12 may be rectangular or the like in a plan view, or, as shown in FIG. 3, the extension 16 'is made of, for example, an H-shaped steel or the like in a section. Alternatively, other shapes and materials may be employed. Further, only the steel pipe 16a is used as the extension 16 and the concrete 1
6b may not be filled.

Further, the rib plate 19 does not matter at all in its installation position, shape and the like. Of course, the rib plate 19 may be omitted if it is unnecessary in terms of strength.

In addition, in the above embodiment, the seismic isolation device 1
Although the viscoelastic body 2 is used for 0, an elastic body may be used instead. In such a case, the relative displacement of the column C in the upper part and the lower part of the seismic isolation device 10 is attenuated by combining the elastic body with the damper.

In addition, in the above embodiment, the seismic isolation device 10 is incorporated into the column C, but there is no intention to limit the installation location, and there is no limitation between the column and the floor slab, the foundation pile and the foundation slab, etc. It can be installed in various places, including a room.

The seismic isolation device 10 has been described as a so-called laminated rubber type, but may be any other type.

Other than this, any configuration may be adopted as long as it does not depart from the gist of the present invention, and it is needless to say that the above-described configurations may be selectively combined as appropriate. No.

[0033]

As described above, according to the mounting structure of the seismic isolation device of the first aspect, the seismic isolation device is mounted via the mounting member, and the mounting member is positioned parallel to the mounting surface. The fixing device includes a plate portion and a small-diameter portion, and the fixing member is fixed to the plate portion on the outer peripheral side of the small-diameter portion. As described above, since the small-diameter portion has a smaller cross-sectional dimension than the seismic isolation device, the plate portion does not need to have a larger cross-sectional size than the seismic isolation device. Therefore, even if the seismic isolation device is incorporated into a member with a small cross-sectional dimension, such as a column or a pile, the plate does not protrude.
Since the cross-sectional dimensions of the seismic isolation device itself can be maximized, sufficient seismic isolation performance can be ensured. In addition, it is not necessary to increase the cross-sectional dimension of the pillar or the pile member, and the space can be effectively used. In particular, when incorporating a seismic isolation device into an existing structure, the seismic isolation device cannot be applied to parts that cannot be applied due to the small cross-sectional dimensions of the mounting part of the conventional seismic isolation device. Being able to incorporate it, the application range of the seismic isolation device can be expanded.

According to the mounting structure of the seismic isolation device of the second aspect, the small diameter portion is made of a steel pipe. Further, according to the mounting structure of the seismic isolation device according to claim 3, the concrete is filled in the steel pipe. Thus, the rigidity of the small-diameter portion can be increased without increasing the cross-sectional dimension by forming the small-diameter portion into a so-called steel pipe structure or a filled steel pipe concrete structure. Therefore, the effect according to claim 1 can be made more remarkable.

According to the mounting structure of the seismic isolation device of the fourth aspect, the reinforcing rib is formed on the outer peripheral surface of the small diameter portion. Thus, even by providing the reinforcing ribs, the rigidity of the small diameter portion can be increased without increasing the cross-sectional dimension, and the effect according to claim 1 can be further remarkable.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view showing an example of a mounting structure of a seismic isolation device according to the present invention.

FIG. 2 is a plan sectional view of a mounting member used for the mounting structure.

FIG. 3 is a plan sectional view showing another example of the mounting member.

FIG. 4 is a vertical sectional view showing an example of a conventional mounting structure for a seismic isolation device.

[Explanation of symbols]

 Reference Signs List 10 Seismic isolation device 12 Mounting member 15 Mounting plate (plate member) 16 Small diameter portion 18 Anchor bolt (fixing member) 19 Rib plate (reinforcing rib) A Structure

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yoshihisa Kitamura 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation F-term (reference) 2E176 AA04 BB15 BB21 BB28

Claims (4)

[Claims] 1. A mounting structure for a seismic isolation device to be incorporated into a structure, wherein the seismic isolation device is mounted on a mounting surface of the structure via a mounting member, and the mounting member is parallel to the mounting surface. And a small-diameter portion provided between the plate portion and the seismic isolation device and having a cross-sectional dimension smaller than that of the seismic isolation device. A fixing member for fixing the plate portion to the mounting surface, the fixing member being fixed to an outer peripheral side of the small diameter portion. 2. A mounting structure for a seismic isolation device according to claim 1, wherein said small diameter portion is made of a steel pipe. 3. The mounting structure for a seismic isolation device according to claim 2, wherein the steel pipe is filled with concrete. 4. The mounting structure for a seismic isolation device according to claim 1, wherein the plate portion and the seismic isolation device extend on an outer peripheral surface of the small diameter portion. And a reinforcing rib fixed integrally to the seismic isolation device.