JPH039268B2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to a seismic isolation device,
It is used for seismic isolation of bridges, tanks containing liquids, computers and other equipment installed in buildings, or to form seismic isolation floors.

Conventional technology Conventionally, as a seismic isolation device for buildings, bridges, etc., a supported body is supported on a support body through laminated rubber made by alternately laminating rubber and rigid plates to lower the natural frequency. ing. A great feature of such laminated rubber is that it can provide a restoring force proportional to the displacement of the supported body in any horizontal direction relative to the support. However, it is disadvantageous in that it is not easy to manufacture and is expensive because it is constantly subjected to a large load and is used for a long period of time. Furthermore, although it easily undergoes shear deformation in the horizontal direction, it has high rigidity and only a small amount of displacement in the vertical direction. Therefore, one elastic member is compressed in the vertical direction and the other elastic member is expanded, making it easy to generate vibrations in which the supported body reciprocates around a horizontal axis, and its natural frequency is quite high. This is within the range of frequencies included in earthquakes, and there is a possibility of large vibrations in the event of an earthquake. Therefore, the use of seismic isolation devices for buildings is limited to relatively low buildings. Furthermore, no practical seismic isolation device capable of seismically supporting relatively small equipment was used. Furthermore, if an attempt was made to lower the natural frequency of the seismic isolation device, the height of the laminated rubber would increase, making it impossible to support it stably, making it impractical.

Problems to be Solved by the Invention This invention, like the laminated rubber of conventional seismic isolation devices, can always provide a restoring force proportional to the displacement even if the supported body is displaced relative to the support in any horizontal direction. An object of the present invention is to provide a seismic isolation device using an elastic member that has rubber-like elasticity so that no load is constantly applied, can be manufactured inexpensively and easily, and can withstand long-term use. This invention also provides a practical seismic isolation device that prevents vibrations around a horizontal axis and is suitable for seismic isolation of relatively tall buildings, or that can seismically support relatively small equipment. This is what we are trying to provide. Furthermore, the present invention provides a seismic isolation device that can be constructed so that it does not become unstable even when the height of the elastic member increases, and that can easily obtain a low natural frequency.

Means for Solving the Problems The present invention includes an elastic member extending in the vertical direction whose upper and lower ends are connected to one and the other of a supported body and a supporting body, respectively, and a supporting body that absorbs most of the weight of the supported body. A seismic isolation device having a support portion that supports the base without using the elastic member,
The elastic member has rubber-like elasticity and has both ends fixed to the supported body and the supporting body so as to be integral with the supported body, and allows the supported body to be displaced in any horizontal direction with respect to the supporting body. To provide a seismic isolation device which is always sheared and gives elastic restoring force when displaced, and has almost no shear strain when the supported body is not displaced with respect to the supporting body. It is.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In one embodiment of the present invention shown in FIGS. 1 and 2, 10 is a supported body, and 12 is a supporting body made of, for example, a metal plate or the like and having a single structure. The support 12 is arranged on a floor 25. Reference numeral 13 designates four support parts for supporting the supported body 10 with respect to the support body 12, and a rolling member 15 consisting of a free wheel is provided at the lower end. All the weight of the supported body 10 is transferred to the support part 13
It is designed to be supported by the support body 12 via. 16 is one elastic member made of rubber, the flange at the lower end is fixed to the support body 12 by a plurality of bolts 18, and the flange at the upper end can be removed from the bottom of the supported body 10 by bolts 21. It is fixed to. A plurality of elastic members 16 may be provided, and laminated rubber made by alternately laminating rigid plates such as steel and rubber may be used, but in reality, this is hardly necessary and no load is constantly applied. Therefore, the number of rigid plates may be very small.

The supported body 10 can be displaced in the horizontal direction with respect to the support body 12, and in this case, the rolling member 15 of the support portion 13 is adapted to roll, and when displaced, the elastic member 16 mainly This results in elastic deformation due to shear strain. Due to this elastic deformation, the supported body 10 receives a restoring force and vibrates. By setting this natural frequency to 1 Hz or less, which is not included in earthquakes, it is possible to almost prevent large shaking in the event of an earthquake. In the case of an earthquake, the supported body 10 is displaced with respect to the supporting body 12, but the supporting body 12 has a large coefficient of friction against the floor 25 made of concrete, for example, and supports the entire weight of the supported body 10, so the friction is large. It has become so powerful that it can barely move. The support 12 may be fixed to the floor 25 if necessary.

In another embodiment of the present invention shown in FIG. 3, a support portion 13 consisting of the lower surface of the supported body 10 is supported by a rolling member 15 consisting of a ball provided so as to be able to roll on the upper surface of the support body 12. . Reference numeral 30 indicates a plate member fixedly extending horizontally outward from the vicinity of the center of the supported body 10, and reference numeral 31 indicates a plurality of attachment members provided on the support body 12 so as to extend upward. The elastic members 16 are provided so as to extend upward and downward from the upper and lower surfaces of the plate member 30, respectively, and are fixed to the mounting member 31. With such a structure, it is possible to prevent the supported body 10 from tilting in the event of an earthquake. In general, only the elastic member 16 that connects the lower end to the supported body 10 may be provided.

Another embodiment of the present invention shown in FIG. 4 has a movable base 35 to which various devices 33 can be fixed, and this movable base and the devices 33 serve as the supported body 10. The movable table 35 is provided with a support portion 13 extending downward, and a rolling member 15 formed of a large number of balls provided on the support body 12 is supported.
Such a structure allows a pre-manufactured device to support various types of equipment 33, and is also suitable for use as a seismic isolation floor.

In another embodiment of the invention shown in FIG.
The supported body 10 has a plate member 30 fixed thereto, and the support portion 13 on the lower surface is slidably supported on the support body 12 without intervening a rolling member.
Reference numeral 37 indicates a plurality of mounting members (1
(only one is shown). Reference numeral 38 denotes a pair of handles that are screwed together and penetrate through each mounting member 37 as shown in the figure, and a friction member 40 that applies a frictional force by sandwiching the plate member 30 from above and below is provided at the tip end thereof. When it moves, it exerts a frictional damping force. In this embodiment, in the case of an earthquake, the friction force between the support part 13 of the supported body 10 and the support body 12 and the friction force between the friction member 40 and the plate member 30 act, but the friction force between the support body 12 and the floor 25 acts. The force is made sufficiently large, or the support 12 is fixed to the floor 25 so that the support 12 does not move relative to the floor 25.

In another embodiment of the invention shown in FIG.
The floor made of concrete constitutes the support body 12 as it is, and the lower end of the elastic member 16 is buried in this support body, and the support part 30 of the supported body 10 is buried in this support body.
A metal member 42 that holds a large number of rolling members 15 is embedded in the portion that supports the.

In this invention, a damping device (not shown) such as a hydraulic damper may be added.

Effects of the Invention This invention provides support for the supported body 1 in the same way as the conventional laminated rubber.
0 is displaced in any horizontal direction with respect to the supporting body 12, the elastic member 16 that always gives an elastic restoring force is used, and the elastic member 16 is always in a state where no weight acts from the supported body 10 and no shear strain. Since it can be maintained, the elastic member 16 can be manufactured very easily and at low cost, and has the effect of being able to withstand long-term use. Further, according to the present invention, in the event of an earthquake, the supported body 10 does not have high-frequency natural vibration around the axis in the horizontal direction, and can mainly vibrate only in the horizontal direction, so that even tall buildings etc. can be seismically isolated well, or compared to It has the advantage that it can be used for seismic isolation of small-scale equipment, and that it does not become unstable even when a tall elastic member 16 is used, so it is possible to provide a seismic isolation device with a low natural frequency. .

[Brief explanation of drawings]

FIG. 1 is a front view showing one embodiment of the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIGS. 3 to 6 partially show different embodiments of the present invention. FIG. 3 is a front view shown in cross section or partially removed. 10 is a supported body, 12 is a support body, 15 is a rolling member, and 16 is an elastic member.

Claims (1)

[Scope of Claims] 1. An elastic member extending in the vertical direction whose upper and lower ends are connected to one and the other of a supported body and a supporting body, respectively; A seismic isolation device having a support part that supports the support without using the elastic member, wherein the elastic member has rubber-like elasticity and both ends are fixed to the supported body and the support body so as to be integral with each other. A state in which the supported body is allowed to be displaced in any horizontal direction relative to the support, and when displaced, it is always sheared and deformed to provide elastic restoring force, and the supported body does not displace with respect to the support. A seismic isolation device characterized by having almost no shear strain. 2. The seismic isolation device according to claim 1, wherein the elastic member is made of rubber without a built-in rigid plate.