JP2834435B2 - Building seismic isolation device - Google Patents

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 for a building, and more particularly, to a rubber seismic isolation mat provided between a foundation and a foundation, and an interposition between an anchor bolt and the foundation. Of improved rubber seismic isolation cylinders.

[0002]

2. Description of the Related Art Conventionally, seismic isolation devices in which seismic isolation laminated rubber or the like is installed on the foundation of a reinforced concrete building are widely known. However, since this type of device is not suitable for general houses such as wooden buildings, in recent years, development of seismic isolation devices compatible with general houses has been promoted.

[0003] For example, Japanese Patent Application Laid-Open No. Hei 7-139217 discloses a technique for absorbing roll and pitch.
A seismic isolation device in which a block made of rubber for seismic isolation and load resistance is interposed between the upper surface of the foundation of a wooden building and the base, and a plurality of grooves and hollow holes are formed in the block along the width direction thereof is disclosed. Have been.

Japanese Patent Laid-Open Publication No. Sho 61-53966 discloses a seismic isolation device in which a rubber seismic isolation tube is fitted around the outer periphery of an anchor bolt connecting the foundation and the base in order to absorb the seismic motion transmitted from the foundation to the base. A seismic device is described.

[0005]

However, the conventional seismic isolation device has the following problems. (1) In the seismic isolation device of JP-A-7-139217, the grooves and hollow holes provided in the block body are formed along the width direction, so that the block body has high horizontal rigidity in the width direction, The seismic isolation effect is low for the seismic motion oscillating in the width direction. In addition, since the vertical load of the building is received only by the partition wall due to the existence of the hollow portion, it is difficult to sufficiently support the building (the vertical rigidity of the block body cannot be sufficiently secured). (2) In the seismic isolation device disclosed in Japanese Patent Application Laid-Open No. 61-53966, the seismic isolation cylinder is a complete cylindrical body, so the horizontal rigidity of the seismic isolation cylinder is relatively large, and particularly, against rolling There is a possibility that sufficient seismic isolation effect cannot be obtained.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and it is an object of the present invention to provide a building capable of properly absorbing the roll of a foundation in all directions and reliably supporting a vertical load of the building. The purpose is to provide a seismic isolation device for objects.

[0007]

The present invention has the following arrangement to achieve the above object. That is, the invention of claim 1 is a seismic isolation device for a building having a rubber seismic isolation mat between a foundation and a base, wherein a plurality of protrusions are adjacent to both front and back surfaces of the seismic isolation mat. The objects are substantially circumscribed in a state where they are in close contact with each other or have a slight gap, and are integrally molded in a substantially uniform arrangement, and the plurality of protrusions have substantially the same outer diameter and have the same height. A seismic isolation device for a building, which is provided on both front and back surfaces of the seismic isolation mat and has a substantially cylindrical shape set to be higher than a diameter dimension, and faces up and down on both front and back surfaces.

According to a second aspect of the present invention, the plurality of projections are
The seismic isolation device for a building according to claim 1, wherein the height is set to be at least twice the diameter dimension.

According to a third aspect of the present invention, the seismic isolation mat of the first or second aspect is provided between the foundation and the base, and the anchor bolt embedded in the foundation is made to penetrate the base so that the upper end of the anchor bolt is formed. A seismic isolation device for a building in which a foundation and a base are joined by tightening with a nut and a rubber seismic isolation tube is fitted around the anchor bolt, and a plurality of slits are formed in the seismic isolation tube in a side view. This is a seismic isolation device for buildings, which is provided in a substantially grid pattern.

According to the present invention, each of the plurality of projections arranged substantially uniformly is deformed, so that the ground motion transmitted from the foundation to the base can be satisfactorily responded to a horizontal roll in any direction during an earthquake. Can be absorbed. In addition, since the plurality of protrusions are substantially circumscribed with each other, a gap between the protrusions can be reduced, and the dense load can surely receive the vertical load of the building.

Also, since a plurality of projections are provided on both the front and back surfaces of the seismic isolation mat, the plurality of projections are deformed on each of the base side and the base side, so that a plurality of projections are provided only on one side. In comparison, a better seismic isolation effect can be obtained. In addition, since the projection has a substantially columnar shape, the horizontal rigidity of the projection has no directivity, and it is possible to reliably cope with a horizontal swing in any direction. In addition, since the plurality of protrusions are vertically opposed to each other on both the front and back surfaces of the seismic isolation mat, the center axes of the upper and lower protrusions sandwiching the seismic isolation mat coincide. Thereby, the vertical load of the building is more stably supported by the plurality of protrusions on both sides.

Further, since the seismic isolation cylinder is divided into a plurality of parts by the plurality of slits, each of the divided rubber pieces can be easily deformed independently. As a result, the rigidity of the seismic isolation cylinder as a whole is reduced, and the seismic vibration transmitted from the foundation to the base is favorably absorbed by the easily deformable seismic isolation cylinder.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG.
A seismic isolation device for a building provided with a rubber seismic isolation mat 6 between a foundation 2 and a base 4, wherein a plurality of projections made of an elastic material are provided on at least one of the front and back surfaces of the seismic isolation mat 6. The parts 6a are substantially circumscribed and arranged substantially uniformly. In this embodiment, the anchor 2 embedded in the foundation 2 is penetrated through the base 4, and the upper end of the anchor bolt 8 is tightened with the nut 10.
And the base 4 are connected to each other, and a rubber seismic isolation tube 12 is fitted around the outer periphery of the anchor bolt 8. Hereinafter, the configuration of each unit will be described in detail.

The foundation 2 has a substantially rectangular cross section made of concrete. The base 4 supported on the foundation 2 via the seismic isolation mat 6 is made of, for example, a wooden timber,
On the upper surface, a pulling, a joist and the like (not shown) are supported. A through hole 4a having a circular cross section through which an anchor bolt 8 embedded in the foundation 2 is inserted is formed in the center of the base 4 in the width direction.
Is provided. The seismic isolation tube 12 fitted to the outer periphery of the anchor bolt 8 is fitted into the through hole 4a.
The upper and lower surfaces of the rubber seismic isolation tube 12 are respectively
The upper surface and the lower surface of the base 4 are substantially flush with each other. The upper end of the anchor bolt 8 is formed with a male screw 8a, and projects above the upper surface of the base 4 (the upper surface of the seismic isolation cylinder 12). At the time of construction, the base 2 and the base 4 are fastened by screwing the nut 10 after fitting the rubber pad 14 and the metal washer 16 to the exposed male screw portion 8a.

Next, the configurations of the seismic isolation mat 6 and the seismic isolation cylinder 12 will be described in detail. As shown in FIGS. 2 and 3, the seismic isolation mat 6 is a plate-like member having substantially the same width as the base 4, and has a substantially cylindrical outer surface having substantially the same outer diameter on its upper and lower surfaces. Are protrudingly provided. The plurality of protrusions 6a are arranged substantially uniformly (specifically, in a staggered manner) over substantially the entire upper surface and lower surface of the seismic isolation mat 6, and the adjacent ones are in close contact with each other or slightly. And a substantially circumscribed state.
The plurality of protrusions 6 a are vertically opposed to each other on both front and back surfaces of the seismic isolation mat 6. It is desirable that the plurality of projections 6a and the seismic isolation mat 6 be integrally formed of the same material in consideration of strength and cost.

Further, the seismic isolation mat 6 is connected to the seismic isolation mat 6 adjacent to the base 4 in the longitudinal direction. This connection structure is, for example, as shown in FIG. One that fits the convex portion 6b provided at the portion with the concave portion 6c provided at the end of the other seismic isolation mat 6 is exemplified.

In order to ensure a sufficient amount of horizontal deformation of the projection 6a, the height H of the projection 6a is preferably set to be higher than its diameter D, and more preferably, the height H of the projection 6a. It is preferable to set H to twice or more the diameter dimension D.

The seismic isolation cylinder 12 is shown in FIGS. 5A and 5B.
As shown in the figure, the slit 1 has a substantially cylindrical shape having a bolt hole 12a, and a plurality of slits 1
8a and 18b are engraved in a substantially grid pattern in side view.
The plurality of slits 18 a and 18 b are cut inward in the radial direction from the outer peripheral surface of the seismic isolation tube 12 and extend vertically in the side view, and are cut inward in the radial direction from the outer peripheral surface of the seismic isolation tube 12. And a plurality of horizontal slits 18b formed along the horizontal direction (circumferential direction) in side view. Plural vertical slits 18a and horizontal slits 1
8b are provided at substantially equal intervals in the circumferential direction and the vertical direction. Therefore, the seismic isolation cylinder 12 is divided by the vertical slits 18a and the horizontal slits 18b into a plurality of substantially identical rubber pieces 20 projecting radially outward from the vicinity of the inner periphery of the bolt hole 12a (FIG. )reference).

The seismic isolation mat 6, a plurality of protrusions 6a,
As the seismic isolation tube 12 and the rubber pad 14, various natural rubbers, synthetic rubbers or a combination thereof commonly used for seismic isolation load bearing can be used. The material of the rubber depends on the weight of the building. There is no particular limitation as long as it satisfies the required vertical rigidity, required seismic isolation performance, and the durability and weather resistance of the seismic isolation device.

According to the present embodiment having the above-described configuration, the plurality of protrusions 6a, which are arranged substantially uniformly over both the front and back surfaces of the seismic isolation mat 6, are each deformed.
The seismic motion transmitted from the base 2 to the foundation 4 can be satisfactorily absorbed with respect to the roll in all directions in the horizontal direction.
Further, since the plurality of protrusions 6a are substantially circumscribed with each other, the gap between the protrusions 6a can be reduced, and the dense load of the plurality of protrusions 6a can reliably receive the vertical load of the building.

Further, since the plurality of protrusions 6a are provided on both front and back surfaces of the seismic isolation mat 6, the plurality of protrusions 6a are respectively deformed on the base 2 side and the base 4 side. A better seismic isolation effect can be obtained as compared with the one provided with the protrusion 6a. Also, the protrusion 6
Since a has a substantially cylindrical shape and is arranged uniformly, the horizontal rigidity of each of the protrusions 6a and the plurality of protrusions 6a as a whole has no directivity, and it is possible to reliably cope with a roll in any direction. Further, since the plurality of protrusions 6a vertically oppose each other on both the front and back surfaces of the seismic isolation mat 6, the center axes C of the upper and lower protrusions 6a sandwiching the seismic isolation mat 6 coincide. Thereby, the upper and lower protrusions 6a forming a pair with the vertical load of the building
And can be more stably supported.

The seismic isolation cylinder 12 has a plurality of slits 18.
Since the rubber pieces 20 are divided into a plurality of pieces by a and 18b, each of the divided rubber pieces 20 can be easily deformed independently. Thereby, the rigidity of the seismic isolation cylinder 12 as a whole is reduced, and the seismic motion can be favorably absorbed by the seismic isolation cylinder 12 which is easily deformed. Further, since the vertical slits 18a and the horizontal slits 18b are provided at equal intervals, the rigidity of the seismic isolation cylinder 12 in the horizontal direction is also uniform, and it is possible to cope with a horizontal swing in a certain direction.

Further, in the present embodiment, since the rubber pad 14 is provided between the washer 16 and the upper surface of the base 4, rubber is interposed in all contact portions between the base 2 and the anchor bolts 8 and the base 4. For this reason, the transmission of the seismic motion from the foundation 2 to the base 4 is completely insulated by the seismic isolation mat 6, the protrusion 6a, the seismic isolation cylinder 12, and the rubber pad 14, so that the seismic isolation effect is greatly improved as compared with the conventional case. Can be done.

This embodiment is a preferred embodiment of the present invention, and the technical scope of the present invention is not limited to this embodiment.

[0025]

As described above, according to the seismic isolation device for a building of the present invention, it is possible to properly absorb the roll of the foundation in all directions and to surely support the vertical load of the building. it can.

[Brief description of the drawings]

FIG. 1 is a perspective view of a seismic isolation device for a building according to an embodiment.

FIG. 2 is a perspective view of a seismic isolation mat and a protrusion according to the embodiment.

FIG. 3 is a side view of a seismic isolation mat and a protrusion according to the embodiment.

FIG. 4 is a plan view showing a combined structure of a seismic isolation mat and a protrusion according to the present embodiment.

FIG. 5 shows a seismic isolation tube of the present embodiment,
(A) is a plan view and (b) is a side view.

[Explanation of symbols]

 2 Base 4 Base 6 Seismic isolation mat 6a Projection 8 Anchor bolt 8a Male screw (upper end of anchor bolt) 10 Nut 12 Seismic isolation cylinder 18a Vertical slit 18b Horizontal slit

Claims (3)

(57) [Claims] 1. A seismic isolation device for a building having a rubber seismic isolation mat between a foundation and a base, wherein a plurality of protrusions are adjacent to each other on both front and back sides of the seismic isolation mat. The two or more protrusions have substantially the same outer diameter and have a height higher than the diameter of the plurality of protrusions. A seismic isolation device for a building, which is provided on both front and back surfaces of the seismic isolation mat in a substantially columnar shape that is set to be high, and faces up and down on both front and back surfaces. 2. The seismic isolation device for a building according to claim 1, wherein the height of the plurality of protrusions is set to be at least twice the diameter of the protrusion. 3. The seismic isolation mat according to claim 1 or 2 is provided between the foundation and the base, the anchor bolt embedded in the foundation is penetrated through the base, and the upper end of the anchor bolt is tightened with a nut. A seismic isolation device for a building in which a base and a base are joined together and a rubber seismic isolation tube is fitted around the anchor bolt, wherein a plurality of slits are formed in the seismic isolation tube in a substantially grid-like shape in a side view. A seismic isolation device for buildings, provided in