JPH02113144A - Three dimensional vibration free device - Google Patents

Abstract

PURPOSE:To obtain a three dimensional vibration free device for a light structure withno creep of laminating rubber by providing hollow laminating rubber limited onto to a vertical movement by a guide member and a coil spring in parallel and partly supporting the weight of the vibration free member by the coil spring. CONSTITUTION:Hollow laminating rubber 3 is fixed to a base 1 through a lower flange 14 and a coil spring 4 is disposed in the hollow part of the hollow laminating rubber 3. This coil spring 4 supports a vibration free member 2 through a support member 7 and the movement of the support member 7 is limited only to a vertical direction by a guide member 6. Since the weight of the vibration free member 2 can be partly supported by the coil spring 4, a three dimensional vibration free device and a three dimensional vibration removing device for a light structure with no creep of the laminating rubber can be applied.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a three-dimensional seismic isolation device, and is particularly applicable to a three-dimensional seismic isolation structure for lightweight structures, and is suitable for implementing vibration isolation.
This relates to a dimensional seismic isolation device.

[Conventional technology] Laminated rubber conventionally used for horizontal seismic isolation of buildings, etc. has not been widely used for seismic isolation of lightweight structures, and ball bearings and sliding members are used to support the upper load. ,
Coil springs were often used as restoring force members.

This is because the natural period of a seismic isolation structure is made longer (for example, 1~
(about 3 seconds), so the relative deformation during an earthquake will be large, but if the supporting load of the laminated rubber is small, its diameter will be small,
This is because there is a risk of buckling since it becomes elongated.

Recently, laminated rubber has been reconsidered as a vibration isolation/vibration isolating device for lightweight structures that can provide not only seismic isolation but also vibration damping or damping effects in the same device.

For example, in the technique described in Japanese Patent Application Laid-Open No. 61-116142, in order to apply the laminated rubber to lightweight structures, four small laminated rubber pieces are made into a set, and the upper and lower ends of these pieces are each formed into one stabilizing plate. A method is adopted that allows large relative deformation by being fixed and configuring in multiple stages.

This structure tends to be relatively tall due to its multi-tier structure, and the weight of the stabilizer plate is relatively large, so there is a risk that surging of the multi-tier laminated rubber itself may occur during an earthquake.

[Problems to be Solved by the Invention] In the above-mentioned conventional technology, when the supporting load is large, the vertical spring constant is too large in order to ensure the horizontal spring constant and allowable relative displacement of the laminated rubber. It may not be possible to design. As a result, over the long term, the amount of creep in the laminated rubber increased and the sinking of the equipment became a problem.

The present invention has been made to solve the problems in the prior art described above, and can be applied even when the spring constant of the laminated rubber in the vertical direction cannot be large, and the weight of the seismically isolated body is equalized by a coil spring. It is an object of the present invention to provide a three-dimensional seismic isolation device for a lightweight structure, which can support parts of the structure and prevent creep of laminated rubber.

[Means for Solving the Problems] In order to achieve the above object, the structure of the three-dimensional seismic isolation device according to the present invention is a seismic isolation device provided between the foundation and the seismically isolated body, The seismically isolated body includes rubber, a coil spring provided in parallel to the laminated rubber, and means for limiting relative displacement between the seismically isolated body side of the laminated rubber and the seismically isolated body only in the vertical direction. is supported by the coil spring so that the movement of the laminated rubber in the vertical direction is smaller than the movement of the seismically isolated body in the vertical direction.

In addition, to add an additional note to the idea behind the development of the present invention, in view of the problems of the prior art, as a horizontal seismic isolation device for lightweight structures, the diameter of the laminated rubber is increased to accommodate a large relative deformation, and the horizontal spring constant is increased. In order to prevent this increase, we thought it would be effective to provide a hollow part in the laminated rubber. Therefore, specifically, a hollow laminated rubber and a coil spring constituting a three-dimensional seismic isolation device are installed in parallel, and in the vertical direction, the movement of the laminated rubber on the side of the seismically isolated body with respect to the movement of the seismically isolated body is prevented. The seismic isolation body is supported so that the seismic isolation becomes 0 or less than a fraction of the amount.

[Function] According to the above technical means, the coil spring provided in parallel with the hollow laminated rubber supports all or part of the weight of the seismically isolated body. This solves the creep phenomenon that has been a problem with laminated rubber.

Generally speaking, the vibration isolation effect depends on the natural frequency f0 of the vibration system.
is sufficiently smaller than the input dominant frequency f (f, < f
The seismic isolation device obtained in ΔT), which has almost no frictional effect during minute vibrations, can be used as a vibration isolator. Therefore, the three-dimensional tinting device of the present invention can also be used as a vibration isolating device. [Example] Hereinafter, each example of the present invention will be described with reference to FIGS. 1 to 3.

FIG. 1 is a longitudinal sectional view of a three-dimensional seismic isolation device according to an embodiment of the present invention.

In Fig. 1, 1 is the foundation, 2 is the seismically isolated body, 3 is the hollow laminated rubber body (hereinafter referred to as hollow laminated rubber), 4
1 is a first coil spring, and 5 is a bottom hole having a spring receiving seat for the coil spring 4.

Reference numeral 6 denotes a guide member, and this guide member 6 functions as a means for limiting the relative displacement between the base-isolated body side of the hollow laminated rubber 3 and the base-isolated body 2 only in the vertical direction.

7 is a support member for supporting the seismically isolated body 2 on the coil spring 4; 8 is a ring-shaped resistance disc arranged in multiple layers in the hollow part of the hollow laminated rubber 3; 9 is each resistance disc; A spacer member for keeping the gap between the disks 8 constant, 1o a stable spring member, 11 a moving body constituting the support member 7, and this moving body 11 has a resistance on the side of the coil spring 4 which is the tip thereof. It is equipped with a plate 11a. Further, reference numeral 12 denotes a partition plate that constitutes the support member 7, and this partition plate 12 functions as a spring receiving portion for the coil spring 4.

13 is a viscous body filling the hollow part of the hollow laminated rubber 3.

14 is a lower flange of the laminated rubber formed integrally with the hollow laminated rubber 3; this lower flange 14 is joined to the bottom plate 5, and is attached to the foundation 1 together with the bottom plate 5. 15 is an upper flange of the laminated rubber formed integrally with the hollow laminated rubber 3, and 16 is a guide holder fixed to the upper flange 15 to which the guide member 6 is attached.

The configuration of the three-dimensional seismic isolation device shown in FIG. 1 will be explained in more detail.

The hollow laminated rubber 3 with the bottom plate 5 attached is attached to the lower flange 14
The first coil spring 4 is fixed to the foundation 1 through the hollow laminated rubber 3, and the first coil spring 4 is installed in the hollow part of the hollow laminated rubber 3.

The coil spring 4 supports the seismically isolated body 2 via the support member 7, and the movement of the support member 7 is limited only in the vertical direction (vertical direction) by the guide member 6.

Furthermore, a plurality of ring-shaped resistance discs 8 are provided in the hollow part of the hollow laminated rubber 3 and have an inner diameter larger than that of the first coil spring 4 and an outer diameter smaller than the inner diameter of the hollow laminated rubber 3.
are arranged in layers, and a spacer member 9 is provided to ensure a constant gap between these resistance disks 8, and the uppermost resistance circle is arranged so that the resistance disks 8 can move stably in the horizontal direction. A stable spring member 1o is provided for applying a constant load to a plate or the like.

The support member 7 also includes a moving body 11 having a resistance plate 11a at its tip and a partition plate 1 that functions as a spring seat for the coil spring 4.
2 are formed integrally with each other, and a viscous body 13 is filled from the hollow part of the hollow laminated rubber 3 to a position where the resistance plate 11a and the partition plate 12 of the moving body 11 are immersed, and a spatial area is provided above the viscous body 13. 7a is provided.

Next, the operation of such a three-dimensional seismic isolation system will be explained.

Of the three-dimensional earthquake input, for the horizontal component, the vibration system consisting of the seismic isolation body 2, the hollow laminated rubber 3, and the first coil spring 4 is lower than the main frequency component of the earthquake. By vibrating at the natural frequency, the effect of reducing earthquake response acceleration, that is, the seismic isolation effect is exhibited. At this time, as the hollow laminated rubber 3 deforms horizontally, a relative displacement occurs between the resistance discs 8, so the relative deformation in the horizontal direction is suppressed by the viscous resistance force generated by the viscous body 13 between the resistance discs 8. be done.

In addition, in the vertical direction, the first coil spring 4 undergoes horizontal deformation and vibrates in the vertical direction at a natural frequency determined by the seismically isolated body 2 and the first coil spring 4, resulting in a seismic isolation effect. occurs. The support member 7 on which the seismically isolated body 2 is placed is
Since the guide member 6 restricts relative movement only in the vertical direction, the seismically isolated body 2 does not undergo rocking vibration.

Further, as the supporting member 7 vibrates in the vertical direction, the movable body 11 including the resistance plate 11a and the partition plate 12 push the viscous body 13 apart, so a viscous resistance force is generated, and the relative displacement in the vertical direction is suppressed. Ru.

According to this embodiment, by arranging the hollow laminated rubber 3 and the coil spring 4 in parallel, the weight of the seismically isolated body 2 can be partially supported by the coil spring 4. 3-dimensional seismic isolation device for lightweight structures without
It has become possible to apply it as a dimensional vibration isolator between the foundation and the seismically isolated body.

Next, FIG. 2 is a longitudinal sectional view of a three-dimensional seismic isolation device according to another embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 1 are the same parts as in the previous embodiment, so the explanation thereof will be omitted.

The difference between the embodiment shown in FIG. 2 and the embodiment shown in FIG. 1 is that the second coil spring 17 supporting the support member 7 It is established between Specifically, the second coil spring 1
7 is set between the upper flange 15 of the hollow laminated rubber 3 and the seismically isolated body mounting seat of the support member 7. This serves as a safety device to prevent the first coil spring 4 from buckling due to the first coil spring 4 receiving larger than expected shear deformation during an earthquake.

When designing the second coil spring 17, the first coil spring 4 supports most of the weight of the seismically isolated body 2, and the second coil spring 17 is designed to accommodate the allowable deformation in the vertical direction. The first
so that it operates only when the coil spring 4 of
The support member 7 and the second
It is only necessary to consider the distance between the coil spring 17 and the coil spring 17.

The embodiment shown in FIG. 2 is expected to have the same effects as the embodiment shown in FIG. A dimensional seismic isolation device can be provided.

Next, although not shown in the drawings, as yet another embodiment of the present invention, it is also possible to arrange first coil springs in parallel outside the hollow laminated rubber.

Note that, as described above, the three-dimensional seismic isolation device of the present invention can exhibit a vibration-proofing effect against constant microtremors and a vibration-proofing effect against vibrations generated from equipment.

FIG. 3 is a schematic configuration diagram showing an example in which the three-dimensional seismic isolation device of the present invention is applied to floor seismic isolation. That is, the floor 20 is used as a seismically isolated body, and the three-dimensional seismic isolation device 2 corresponding to each of the above-mentioned embodiments is used.
This is what was supported in 1.

For example, a plurality of three-dimensional seismic isolation devices of the present invention may be used as a seismic isolation/vibration isolation floor on a floor level that supports computers, semiconductor manufacturing equipment, etc.

[Effects of the Invention] As described above, according to the present invention, by arranging the hollow laminated rubber and the coil spring in parallel, the weight of the seismically isolated body can be partially supported by the coil spring. Therefore, it is possible to provide a three-dimensional seismic isolation device for lightweight structures without creep of laminated rubber.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a three-dimensional seismic isolation device according to one embodiment of the present invention, FIG. 2 is a longitudinal cross-sectional view of a three-dimensional seismic isolation device according to another embodiment of the present invention, and FIG. 1 is a schematic elliptical diagram showing an example in which the three-dimensional seismic isolation device of the present invention is applied to floor seismic isolation. DESCRIPTION OF SYMBOLS 1... Foundation, 2... Seismic isolation body, 3... Hollow laminated rubber, 4... First coil spring, 6... Guide member, 7... Support member, 8... ...Resistance disk, 9...Spacer member, 11...Moving body, lla...Resistance plate, 1
2... Partition plate, 13... Viscous body, 17... Second
coil spring.

Claims (1)

[Scope of Claims] 1. A seismic isolation device provided between a foundation and a seismically isolated body, which comprises a laminated rubber, a coil spring provided in parallel to the laminated rubber, and a seismically isolated base of the laminated rubber. means for limiting the relative displacement between the body side and the seismically isolated body only in the vertical direction, the movement of the laminated rubber in the vertical direction of the seismically isolated body is less than the vertical movement of the seismically isolated body. A three-dimensional seismic isolation device, characterized in that it is supported by the coil spring so as to be small. 2. In the product described in claim 1, the laminated rubber is formed in a hollow shape, and discs are arranged in this hollow part in multiple layers, and the gap between the discs is kept constant. A three-dimensional seismic isolation device characterized by providing a spacer. 3. A seismic isolation device installed between a foundation and a seismically isolated body, which includes a hollow laminated rubber, a coil spring provided in the hollow part of the laminated rubber, and a side of the seismically isolated body of the laminated rubber. means for limiting relative displacement with the seismically isolated body only in the vertical direction; and a support member for supporting the seismically isolated body on the coil spring; A three-dimensional seismic isolation device characterized in that ring-shaped disks each having a hole larger than the outer diameter of a coil spring are arranged in multiple layers, and a spacer is provided to maintain a constant gap between the disks. 4. A seismic isolation device installed between a foundation and a seismically isolated body, which includes a hollow laminated rubber, a first coil spring provided in the hollow part of the laminated rubber, and a seismic isolation device of the laminated rubber. a hollow portion of the laminated rubber, comprising: means for limiting relative displacement between the seismic body side and the seismically isolated body only in the vertical direction; and a support member for supporting the seismically isolated body on the coil spring; To,
Ring-shaped discs each having a hole larger than the outer diameter of the coil spring are arranged in multiple layers, and a spacer is provided to keep the gap between the discs constant. A three-dimensional seismic isolation device characterized in that a second coil spring is provided between the seismic isolation body. 5. In any one of claims 2 to 4, the hollow part of the hollow laminated rubber is filled with a viscous material so that the discs arranged in multiple layers are immersed in the hollow part. A three-dimensional seismic isolation device characterized by: 6. In either of claims 3 or 4, the supporting member for supporting the seismically isolated body on the coil spring comprises a moving body equipped with a resistance plate and a hollow laminated rubber. a partition plate that serves as a spring receiving part for a coil spring provided in a hollow part; the hollow part is filled with a viscous material to the extent that the resistance plate of the moving body and the partition plate are immersed; A three-dimensional seismic isolation device characterized in that it is formed so as to have a spatial region above it.