JPH10121773A - Base isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability, and to reduce cost by receiving the load of an upper structure by a stopper section. SOLUTION: The base isolation device is constituted so that an upper structure 7 is installed to a lower structure 8 while interposing an elastic body 1. A stopper member 10 with a bottom wall section 12, which is interposed to the intermediate section of the elastic body 1 approximately horizontally and in which a periphery is projected from an external surface, a peripheral wall section 13 extended downwards from the periphery of the bottom wall section 12 and a flange section 14 being extended to the outside from the opening edge of the peripheral wall section 13 and forming a specified clearance 8 with the elastic-body mounting surface 8a of the lower structure 8 is mounted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a seismic isolation device, and more particularly to a seismic isolation device suitable for a lightweight building such as a general house.

[0002]

2. Description of the Related Art An elastic body is interposed between a structure and a foundation,
There is a seismic isolation device that suppresses the transmission of vibration during an earthquake to structures. In recent years, this seismic isolation device has been used for light-weight buildings such as ordinary houses, but when used for light-weight buildings, the height of the elastic body is larger than the outer diameter, so the horizontal When a large vibration input is applied, a falling moment is generated in the elastic body, and as shown in FIG. 6, the elastic body a may be buckled and not restored.

Therefore, as shown in FIG. 7, a structure has been proposed in which an elastic stopper c is arranged around the elastic body b to prevent the buckling deformation of the elastic body b (Japanese Utility Model Publication No. 5-2080).
No. 8).

[0004]

However, since the seismic isolation device has a structure in which the elastic member b is pressed against the elastic stopper c, the elastic member b and the elastic stopper c are liable to be worn, and there is a problem in durability. There is.

Furthermore, in order to cope with a large vibration input in the horizontal direction, the thickness of the peripheral wall of the elastic stopper c must be increased, which is disadvantageous in cost.

[0006] In view of such circumstances, an object of the present invention is to provide an inexpensive and highly durable seismic isolation device.

[0007]

According to the present invention, there is provided a seismic isolation device in which an upper structure is installed on a lower structure with an elastic body interposed therebetween. A bottom wall having a peripheral edge protruding from an outer surface substantially horizontally interposed therebetween, a peripheral wall extending downward from a peripheral edge of the bottom wall, and a lower wall extending outward from an opening edge of the peripheral wall and A stopper member having a flange portion that forms a predetermined clearance between the stopper member and the elastic body installation surface of the structure is provided.

According to this structure, when a large horizontal vibration input is applied, the flange portion of the stopper member comes into contact with the elastic body installation surface of the lower structure, and the load of the upper structure is supported by the stopper member. become. That is, since the load of the upper structure is applied only to the upper portion exposed from the stopper member of the elastic body, the overturning moment acting on this portion is small, and there is no possibility of buckling deformation.

[0009] Alternatively, a concave portion is provided in the lower structure, the elastic body is provided on the bottom surface thereof, and a stopper member is interposed substantially horizontally at an intermediate portion of the elastic body. A predetermined clearance may be formed between the opening and the adjacent portion of the concave portion by projecting outward from the body.

According to this configuration, when a large horizontal vibration input is applied, the peripheral portion of the stopper member abuts on the adjacent portion of the opening of the concave portion, so that the load of the upper structure is reduced more than the stopper member of the elastic body. Since the upper part will support, the overturning moment acting on this part is small,
There is no risk of buckling deformation.

[0011]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes an elastic body, which comprises an upper unit 2 and a lower unit 3. Each of the units 2 and 3 is formed by laminating a rubber body 4 and a reinforcing plate 5 to form a cylindrical shape, and is provided with mounting plates 6 and 6 at both ends thereof. 8 are fixed with bolts 9 respectively.

The elastic body 1 has a bowl-shaped stopper member 10 interposed between the upper and lower units 2 and 3. The stopper member 10 is provided with mounting plates 6 for the upper and lower units 2 and 3,
6, a bottom wall portion 12 fixed to the bottom wall portion 12 by bolts 11, a peripheral wall portion 13 extending downward from a peripheral edge of the bottom wall portion 12, and a lower structure 8 extending outward from an opening edge of the peripheral wall portion 13. And a flange portion 14 that forms a predetermined clearance δ between the elastic member mounting surface 8a and the elastic member mounting surface 8a. It is preferable that the elastic body installation surface 8a of the lower structure 8 is coated with a Teflon material or the like in order to reduce friction with the flange portion 14.

Since the present embodiment is configured as described above,
When a large horizontal vibration input is applied, the flange portion 14 of the stopper member 10 comes into contact with the elastic body installation surface 8a of the lower structure 8, and the load of the upper structure 7 is supported by the stopper member 10. That is, since the load of the upper structure 7 is applied only to the upper unit 2 exposed from the stopper member 10 of the elastic body 1, the overturning moment acting on this unit 2 is small, and there is a possibility that buckling deformation may occur. Almost gone.

In this embodiment, the stopper member 10
However, as shown in FIG. 2, two stopper members 10 may be provided, and the flange portions 14, 14 may be arranged on the upper and lower structures 7, 8 side. In other words, the bottom walls 12, 12 may be joined together with the flange portions 14, 14 facing the opposite side. In this way, even if a tipping moment is generated in the upper unit 2, the flange portion 14 of the stopper member 10 on the upper side abuts against the elastic body installation surface 7a of the upper structure 7, and the tipping of the upper unit 2 is prevented. Therefore, even when the height of the upper unit 2 is large, the risk of buckling deformation is completely eliminated. Further, since the upper and lower stopper members 10, 10 prevent the inclination of the upper structure 7, the inclination of the upper structure 7 is also reduced.

Alternatively, as shown in FIG. 3, a concave portion 20 is provided in the lower structure 8, the elastic body 1 is installed on the bottom surface 20a thereof, and the mounting plates 6, 6 of the upper and lower units 2, 3 are provided.
A predetermined clearance δ is formed between the stopper member 21 and the adjacent portion 20b of the recess 20 by projecting the peripheral edge of the stopper member 21 outward from the elastic body 1 so as to protrude outward from the elastic body 1. May be.

In this way, when a vibration is input in the horizontal direction, the peripheral edge of the stopper member 21 abuts on the opening adjacent portion 20b of the concave portion 20, and the load of the upper structure 7 is reduced as in the embodiment of FIG. Since the stopper member 21 supports, there is almost no possibility that the upper unit 2 will be buckled.

By the way, as shown in FIG.
Is composed of three units 31, 32, and 33,
The bottom walls 12, 12 of the two stopper members 10, 10 are interposed between the mounting plates 34 of the units 31, 32, 33, and the flanges 14, 14 are respectively placed on the upper and lower structures 7, 8 side. It should be turned.

Alternatively, as shown in FIG. 5, the lower stopper member 10 is housed in the upper stopper member 10 ', and the flange portions 14, 14' of these stopper members 10, 10 'are connected to the lower structure. It may be turned to the 7 side.

[0020]

According to the present invention, at the time of inputting vibration in the horizontal direction, only the peripheral portion of the stopper member slides on the upper surface of the lower structure, and the elastic member is not pressed against other members. Wear is eliminated and durability is improved.

Further, there is an effect that the structure is simplified and the cost becomes advantageous.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a seismic isolation device according to the present invention.

FIG. 2 is a longitudinal sectional view showing a second embodiment of the seismic isolation device.

FIG. 3 is a longitudinal sectional view showing a third embodiment of the seismic isolation device.

FIG. 4 is a longitudinal sectional view showing a fourth embodiment of the seismic isolation device.

FIG. 5 is a longitudinal sectional view showing a fifth embodiment of the seismic isolation device.

FIG. 6 is a diagram illustrating a problem of the seismic isolation device.

FIG. 7 is a longitudinal sectional view showing a conventional seismic isolation device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Elastic body 10 ... Stopper member 12 ... Bottom wall part 13 ... Peripheral wall part 14 ... Flange part 20 ... Depression 20a ... Bottom surface 20b ... Opening adjacent part 21. ..Stopper members

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hirokazu Yamamura 330 Kinagakawa-cho, Inage-ku, Chiba-shi, Chiba

Claims (2)

[Claims] In a seismic isolation device in which an upper structure is installed on a lower structure with an elastic body interposed therebetween, a peripheral edge is protruded from an outer surface by being interposed substantially horizontally at an intermediate portion of the elastic body. A predetermined clearance is provided between a bottom wall portion, a peripheral wall portion extending downward from a peripheral edge of the bottom wall portion, and an elastic body installation surface of the lower structure extending outward from an opening edge of the peripheral wall portion. A seismic isolation device comprising a stopper member having a flange portion to be formed. 2. A seismic isolation device in which an upper structure is installed on a lower structure with an elastic body interposed therebetween, wherein the lower structure is provided with a concave portion, and the elastic body is installed on a bottom surface thereof. A stopper member is interposed substantially horizontally at an intermediate portion of the elastic body, and a predetermined clearance is formed between the stopper member and the adjacent portion of the opening of the concave portion by projecting a peripheral edge of the stopper member outward from the elastic body. Characteristic seismic isolation device.