JP2931965B2 - Seismic isolation device for buildings - 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 which absorbs horizontal vibration of the ground due to an earthquake and prevents the vibration from being transmitted to a building.

[0002]

2. Description of the Related Art As a conventional seismic isolation device for buildings, there is, for example, one described in Japanese Utility Model Publication No. 3030666. The seismic isolation device described in this publication includes a bar steel slidably arranged vertically in a vertical hole formed on the upper surface of the foundation concrete, and an I-shaped steel having a web central portion welded to the tip of the bar steel. And a coil spring disposed between the upper surface of the foundation concrete and the lower surface of the I-section steel web. Further, a required number of steel balls are arranged between the upper surface of the web of the I-section steel and the lower surface of the groove steel fixed to the foundation horizontal member. In addition, stop plates are provided on both end surfaces of the I-shaped steel so that the steel balls do not fall off.

[0003] When an earthquake occurs, horizontal vibrations are absorbed by rolling of steel balls, and vertical vibrations are absorbed by coil springs, thereby preventing damage to buildings.

However, according to this seismic isolation device, the steel ball is
It is capable of rolling indefinitely in all directions in the horizontal direction on the surface of the channel. Therefore, when a large horizontal vibration occurs, the steel ball easily comes off outside the lower surface area of the grooved steel, and the base transverse member falls off from the bar and the I-beam,
The building could be damaged.

[0005]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a seismic isolation device that can reliably exhibit a seismic isolation function even when a large horizontal vibration occurs and can prevent damage to buildings. To provide.

[0006]

According to the present invention, there is provided, in accordance with the present invention, a base concrete and a base cross member which is placed on the upper surface of the base concrete and supports a column of a building. A stainless steel H-shaped steel fixed to the foundation concrete, wherein the web is in contact with the upper surface of the foundation concrete, having a U-shaped cross-section, fitted and fixed to the lower part of the foundation cross member, A stainless steel slide member slidably disposed on the upper surface of the H-shaped steel web, a stainless steel ball bearing mounted on the lower surface of the slide member, a side wall of the slide member and a flange of the H-shaped steel adjacent thereto And a stainless steel leaf spring which is bent into a substantially flat-bottomed pot lid shape, and flat portions at both ends of the leaf spring are Adjacent to the side wall of the guide member, a central flat portion is adjacent to the flange, and each of the flat portions is formed with a slot extending in the length direction of the base cross member, and has a side wall and a side wall of the slide member. The seismic isolation device is characterized in that each of the flanges of the H-shaped steel is provided with a pin projecting into the relevant slot.

[0007]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view of a building seismic isolation device according to one embodiment of the present invention,
FIG. 2 is a transverse sectional view taken along line XX of FIG.
FIG. 2 is a top view of FIG. In FIG. 3, a rain avoidance cover described later is removed. As shown in FIG. 1, a base isolation device according to the present invention is
And a foundation cross member 11 placed on the upper surface of the foundation concrete 10 and supporting the column 12 of the building.

As shown in FIGS. 1 and 2, according to the present invention, the stainless steel H-section steel 1 is
0, so that the web 1a of the H-section steel 1 comes into contact with the upper surface of the foundation concrete 10. The fixation of the H-section steel 1 to the foundation concrete 10
This is achieved by embedding and fixing a flat plate-shaped adhesive anchor 13 extending vertically from the upper surface of the base 0 into the base concrete 10 and joining the H-shaped steel 1 to the anchor 13.

A slide member 2 made of stainless steel having a U-shaped cross section is fitted into a lower portion of the base cross member 11, and the slide member 2 is firmly fixed to the base cross member 11 by bolts 14 and nuts 15. , H-shaped steel 1 is slidably disposed on the upper surface of the web 1a. In this case, the width of the slide member 2 is formed so as to be substantially equal to the width of the base cross member 11 and smaller than the width of the web 1 a of the H-section steel 1. The H-shaped steel material 1 may be attached to the entire length of the foundation concrete 10 or may be attached to some places on the foundation concrete 10 with an appropriate length. And the slide member 2 is a web 1a of the H-section steel 1.
So that it can be slidably placed on top of
It is attached to one suitable place over a suitable length.

As can be seen from FIGS. 1 and 2, a stainless steel ball bearing 3 is attached to the lower surface of the slide member 2. Thus, the slide member 2 and the base cross member 11 can freely slide in the length direction and the width direction of the H-section steel 1.

As can be seen from FIGS. 2 and 3, between the side walls 2a and 2b of the slide member 2 and the flanges 1b and 1b of the H-shaped steel 1 adjacent thereto, a substantially flat bottom formed by bending a stainless steel plate is provided. A leaf spring 4 having a pot-like side surface is arranged. The flat portions 4a and 4b at both ends of the leaf spring 4 have side walls 2a of the slide member 2,
2b, the central flat portion 4c is arranged so as to be adjacent to the flanges 1b, 1b of the H-section steel 1. Each flat portion 4a, 4b, 4c has a slot 5a, 5b, 5c extending in the length direction of the H-section steel 1. The slots 5a, 5b, 5c all have the same shape.

The side walls 2a, 2b and H of the slide member 2
The flanges 1b, 1b of the profile 1 have pins 6a, 6 projecting into the associated slots 5a, 5b, 5c, respectively.
b and 6c are provided. In this case, each slot 5
a, 5b, 5c and associated pins 6a, 6b, 6c
The positional relationship with the basic concrete 10
Is determined such that the pins 6a, 6b, 6c are located in the center of the slots 5a, 5b, 5c.

Each of the pins 6a, 6b, 6c has a stopper rod 7a, 7b, 7 extending vertically at its tip.
c, and the mounting portions of the stop bars 7a, 7b, 7c on each of the pins 6a, 6b, 6c are rotatable about their axes. When the leaf spring 4 is mounted, the stop bars 7a, 7b, 7c are arranged so as to be parallel to the slots 5a, 5b, 5c.
After the pins 6a, 6b, 6c have been fitted into c, the respective stop bars 7a, 7b, 7c are arranged so as to be perpendicular to the slots 5a, 5b, 5c. The leaf spring 4 is locked with play on the side walls 2a, 2b of the slide member 2 and the flanges 1b, 1b of the H-shaped steel 1 by the stopper rods 7a, 7b, 7c.

As can be seen from FIG. 2, a rain avoiding cover 8 is attached to the slide member 2 adjacent to the upper end of the side wall 2b located on the outer wall side of the building. The rain avoiding cover 8 is arranged at a position corresponding to the H-shaped steel 1 and functions to prevent rainwater from entering the upper surface of the web 1a of the H-shaped steel 1.

Thus, in the seismic isolation device according to the present invention, when an earthquake occurs, the foundation concrete 10, and thus the H-section steel 1 vibrates with the horizontal vibration of the ground, but the building supported by the foundation cross member 11. Since the whole object has inertia, the ball of the ball bearing 3 rolls, so that the foundation concrete 10 and the H-section steel 1
It moves in the direction of vibration with respect to the almost stationary foundation cross member 11. As a result, the horizontal vibration of the ground is absorbed and hardly transmitted to the building.

In this case, the vibration component parallel to the H-section steel 1 is:
The H-shaped steel 1 is absorbed by vibrating in parallel with the base cross member 11 due to the rolling of the ball of the ball bearing 3, and at this time, the pins 6 a, 6 b, and 6 c are connected to the slots of the leaf spring 4. Vibrates within the range guided by 5a, 5b, 5c. Therefore, the base cross member 11 does not fall off from the H-shaped steel 1 and thus from the base concrete 10.

The vibration component perpendicular to the H-shaped steel 1 is as follows.
Leaf spring 4 arranged between base cross member 11 and H-section steel 1
Is absorbed by vibrating in the vertical direction with respect to the base cross member 11 while receiving the elastic force of Also at this time, the base cross member 11 does not fall off from the H-section steel 1. Thus,
Horizontal vibration of the ground due to the earthquake is hardly transmitted to the building, and damage to the building is avoided.

In addition, in the seismic isolation device according to the present invention, since almost all of the members constituting the device are made of stainless steel, the device has a service life substantially equal to the service life of the building. Therefore, if the seismic isolation device according to the present invention is installed at the time of new construction, there is no need to perform maintenance work on the device thereafter.

[0019]

As described above, according to the present invention, when an earthquake occurs, the building can be prevented from being damaged by absorbing the horizontal vibration of the ground transmitted to the building. Moreover, according to the present invention, even in the case of a large earthquake, there is no danger that the foundation cross member supporting the building will fall off the foundation concrete, and the seismic isolation function is reliably exhibited.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view taken along line XX of FIG.

FIG. 3 is a top view of FIG. 1, in which a rain avoidance cover is removed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 H-shaped steel 1a Web 1b Flange 2 Slide member 3 Ball bearing 4 Leaf spring 5a, 5b, 5c Slot 6a, 6b, 6c Pin 7a, 7b, 7c Stop rod 8 Rain avoidance cover 10 Foundation concrete 11 Foundation cross member

Claims (1)

(57) [Claims] 1. A method according to claim 1, wherein the web is fixed between the foundation concrete and a foundation cross member placed on an upper surface of the foundation concrete and supporting a column of a building. A stainless steel H-shaped steel contacting the upper surface of concrete, and a stainless steel slide having a U-shaped cross-section, fitted and fixed to the lower part of the foundation cross member, and slidably disposed on the upper surface of the web of the H-shaped steel Member, a stainless steel ball bearing attached to the lower surface of the slide member, and a stainless steel bent into a substantially flat-bottom pot lid disposed between the side wall of the slide member and the flange of the H-shaped steel adjacent thereto. A flat portion at both ends of the leaf spring is adjacent to a side wall of the slide member, and a flat portion at the center is formed on the flange. Adjacent to each other, the flat portion is formed with a slot extending in the longitudinal direction of the base cross member, and the side wall of the slide member and the flange of the H-section steel are respectively formed in the relevant slots. A seismic isolation device characterized by having protruding pins.