JP2009243519A - Seismic isolator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To adjust damping performance without deteriorating a seismic isolation effect, and to simplify inspection work. <P>SOLUTION: In this seismic isolator 1, a plurality of low yield point steel plates 3, 3... provided with mounting bases 6A, 6B at both upper and lower ends is arranged on the outer circumferential periphery of laminated rubber 2 with flange plates 4, 5 fixed on both upper and lower end surfaces. The mounting bases 6A, 6B are detachably fixed on the flange plates 4, 5, and the low yield point steel plates 3 are formed into an arcuate plate-like shape curved along the periphery of the laminated rubber 2. A damping unit 10 is composed by integrating a pair of upper and lower mounting bases 6A, 6B with the low yield point steel plates 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a seismic isolation device that is provided in a structure or the like and has a laminated rubber to exhibit a seismic isolation effect.

Conventionally, seismic isolation devices employed in base-isolated buildings include laminated rubber in which rubber materials and steel plates are alternately laminated in the vertical direction. Laminated rubber, for example, is interposed between the foundation of a structure and the structure body built on this foundation. When a large horizontal external force is input due to an earthquake or the like, the rubber material deforms in the horizontal direction. By doing so, transmission of the external force to the structure body is reduced, and the structure body is prevented from shaking. Also, as a seismic isolation device, a circular space is secured inside the laminated rubber and lead or lead plugs are encapsulated to forcibly apply horizontal shear deformation, absorbing vibration energy during earthquakes and providing a damping effect. A seismic isolation device is known (see, for example, Patent Document 1).
In Patent Document 1, soft plates and inner layer rubber are alternately laminated, flanges are provided on the upper and lower end surfaces thereof, lead is wound around the outer periphery of the seismic isolation device main body, and a rubber coating layer is provided around the periphery. It is disclosed about the seismic isolation device formed by wrapping the.
JP 2001-182768 A

However, conventional seismic isolation devices have the following problems.
That is, the conventional laminated rubber in which lead (lead plug) is encapsulated has a structure in which the lead plug is embedded in the laminated rubber, so that the lead plug cannot be visually confirmed during inspection. It was.
In addition, in order to adjust the attenuation to increase in the case of a lead plug, it is necessary to increase the hole for the lead plug in the laminated rubber, but the cross-sectional area of the laminated rubber will be reduced, and the load support will be reduced. There was a problem that the capability would decrease and the performance as a seismic isolation device would deteriorate.

  The present invention has been made in view of the above-described problems, and provides a seismic isolation device that can adjust damping performance without reducing the seismic isolation effect and can simplify inspection work. For the purpose.

  In order to achieve the above object, the seismic isolation device according to the present invention is a seismic isolation device including a laminated rubber having flange plates fixed to both upper and lower end surfaces, and is provided at both upper and lower end portions around the outer peripheral side of the laminated rubber. A low yield point steel plate having a mounting base is disposed, and the mounting base is fixed to the flange plate in a removable state.

In the present invention, when an external force is input to the structure due to an earthquake, shear deformation occurs in the laminated rubber, and accordingly, the low yield point steel plates disposed around the outer peripheral side of the laminated rubber yield early, and the earthquake It can absorb energy and damp vibrations. And since it is the structure which does not provide the hole for lead plugs in laminated rubber, it does not reduce the cross-sectional area of laminated rubber, Therefore Damping performance can be added, without reducing the load bearing performance of laminated rubber.
Further, in this seismic isolation device, the low yield point steel plate is arranged on the outer peripheral side of the laminated rubber, so that visual confirmation is possible, and the mounting base and the flange plate are fixed by, for example, bolt fastening. Thus, since the low yield point steel plate can be easily attached to and detached from the outer peripheral side of the laminated rubber, the inspection work can be performed reliably and easily.
Compared to the structure in which lead plugs are enclosed in laminated rubber, many low yield point steel plates can be attached, and the low yield point steel plate can be replaced with laminated rubber. The installation position and quantity of the point steel plates can be changed as appropriate.
In addition, the mounting base and low yield point steel plate can be easily removed from the laminated rubber, so even if the usage of the building (structure) changes and the weight balance changes, the mounting base and low yield point It is possible to remove only the point steel plates and move them to other laminated rubber, and to exhibit the optimal seismic isolation effect corresponding to the balance state of the entire building.

Moreover, in the seismic isolation apparatus which concerns on this invention, it is preferable that the low yield point steel plate has comprised the circular arc board shape curved along the outer periphery of laminated rubber.
In the present invention, since the low yield point steel plate undergoes the same deformation as the shear deformation of the laminated rubber, the damping effect can be further enhanced.

Moreover, in the seismic isolation apparatus which concerns on this invention, it is preferable that the low yield point steel plate comprises a flat plate, and has arrange | positioned the plate | board surface toward the tangential direction of the outer periphery of laminated rubber by planar view.
In the present invention, a plurality of low yield point steel plates can be arranged along the outer peripheral side of the laminated rubber, and the low yield point steel plates at this time are subjected to the same deformation as the shear deformation of the laminated rubber, and the damping The effect can be further enhanced.

In the seismic isolation device according to the present invention, it is preferable that a damping unit in which a low yield point steel plate is integrally incorporated between a pair of upper and lower mounting bases is configured.
In the present invention, since the pair of upper and lower mounting bases and the low yield point steel plate are unitized, it is easy to attach to and remove from the outer peripheral side of the laminated rubber. When changing the damping performance, or when checking the low yield point steel plate or the laminated rubber, the working efficiency can be increased.

  According to the seismic isolation device of the present invention, it is possible to exert an optimum seismic isolation effect by adding damping performance by the low yield point steel plate without reducing the load bearing performance of the laminated rubber, and the low yield point steel plate is laminated. Since it is detachable at the position on the outer circumference side of the rubber, and it is a structure that makes it easy to attach and detach the low yield point steel plate to the laminated rubber, the damping performance can be reduced by changing the installation position of the low yield point steel plate or by increasing or decreasing the number of installation. Adjustment can be performed easily. Moreover, since the low yield point steel plate can be visually confirmed and the attachment / detachment work at the time of inspection becomes easy, the inspection work can be simplified.

Hereinafter, a seismic isolation device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4.
1 is a side sectional view of a seismic isolation device according to an embodiment of the present invention, FIG. 2 is a side view of the seismic isolation device shown in FIG. 1, and FIG. 3 is a sectional view taken along line AA in FIG. FIG. 4 is a side sectional view showing a state of the seismic isolation device at the time of deformation, and corresponds to FIG.

As shown in FIGS. 1 to 3, the seismic isolation device 1 includes a plurality of (four in this case) low on the outer peripheral side of a circular laminated rubber 2 in a plan view in which steel plates and rubber materials are alternately laminated. The yield point steel plates 3, 3,... Are arranged.
Specifically, disk-shaped flange plates 4 and 5 are provided on the upper and lower end surfaces of the laminated rubber 2, and the flange plates 4 and 5 are respectively attached to the upper and lower structures. The flange plates 4 and 5 each have an outer diameter dimension larger than the outer diameter dimension of the laminated rubber 2, and are provided with female screw holes 4a and 5a (see FIG. 3) penetrating in a thickness direction at predetermined positions. In FIG. 3, a female screw hole 5a is formed coaxially on the rear side of the bolt hole 6a.

The low yield point steel plate 3 is a well-known steel material having a low strength compared to mild steel and a high ductility. For example, the low yield point steel plate 3 can promote yielding earlier than a steel damper and attenuates from a relatively small deformation time. The performance can be expected. The low yield point steel plate 3 has an arcuate plate shape that curves along the outer periphery of the laminated rubber 2, and the steel plate surface is arranged vertically between the flange plates 4, 5. A flat mounting base 6 (6A, 6B) is fixed by a fixing means such as welding. The length of the low yield point steel plate 3 along the arc direction is set to a size corresponding to the damping performance, and the adjacent low yield point steel plates 3 and 3 are arranged at a predetermined interval from each other.
And the low yield point steel plate 3 used for this seismic isolation apparatus 1 will carry out the shear deformation | transformation with the horizontal shear deformation of the laminated rubber 2, if an upper structure and a lower structure raise | generate a relative displacement at the time of an earthquake. The energy absorption characteristics are exhibited (see FIG. 4).

  The mounting bases 6A and 6B are flat plates formed in an arc shape along the outer periphery of the laminated rubber 2 in plan view. And the low yield point steel plate 3 is being fixed to the inner side edge part 6b by the side of the lamination | stacking rubber | gum 2 of each attachment base 6A, 6B so that it may become a U-shape by sectional view. Further, bolt holes 6a and 6a are formed at positions corresponding to the female screw holes 4a and 5a formed in the flange plates 4 and 5 described above. The bolt hole 6 a is for inserting a bolt 7 for fixing the mounting base 6 to the flange plates 4 and 5.

  As described above, in the present embodiment, the damping unit 10 (10A, 10B, 10C, 10D) in which the pair of upper and lower mounting bases 6A, 6B and the low yield point steel plate 3 disposed therebetween are integrally incorporated is provided. It is configured. Each of the damping units 10A to 10D is configured to be attachable to and detachable from the laminated rubber 2 at a predetermined position on the outer peripheral side thereof, and the height dimension thereof is substantially the same as the separation dimension of the flange plates 4 and 5 arranged above and below. It has the same dimensions.

  That is, the damping units 10A to 10D are arranged on the outer peripheral side of the laminated rubber 2, and the bolts 7 are inserted into the respective bolt holes 6a of the mounting bases 6A and 6B, while being inserted into the female screw holes 4a and 5a of the flange plates 4 and 5. By screwing, the mounting bases 6A and 6B and the flange plates 4 and 5 are fixed in a detachable state.

Next, the effect | action of the seismic isolation apparatus 1 which consists of such a structure is demonstrated in detail with reference to drawings.
As shown in FIG. 4, in the seismic isolation device 1, when an external force is input to the structure due to an earthquake, shear deformation occurs in the laminated rubber 2, and accordingly, it is arranged around the outer peripheral side of the laminated rubber 2. The low yield point steel plates 3, 3,..., Yield at an early stage and can absorb the seismic energy and attenuate the vibration. And since it is the structure which does not provide the hole for lead plugs in the laminated rubber 2, and it does not reduce the cross-sectional area of the laminated rubber 2, the damping performance is added without deteriorating the load bearing performance of the laminated rubber 2 Can do.

  In the seismic isolation device 1, the low yield point steel plates 3, 3,... Are arranged on the outer peripheral side of the laminated rubber 2. It is a structure that fixes the plates 4 and 5, and the damping units 10A to 10D incorporating the low yield point steel plate 3 can be easily attached to and removed from the outer peripheral side of the laminated rubber 2 for reliable and easy inspection. Work can be done.

In addition, the seismic isolation device 1 can attach more low-yield-point steel plates 3 than the structure in which a lead plug is sealed inside the laminated rubber 2 and also replaces the damping unit 10 with the laminated rubber 2. It has a structure that can.
Furthermore, since the damping unit 10 (the mounting base 6 and the low yield point steel plate 3) can be easily removed from the laminated rubber 2, the usage of the building (structure) changes and the weight balance fluctuates. However, it becomes possible to remove only the damping unit 10 and move them to the other laminated rubber 2, and to exhibit the optimum seismic isolation effect corresponding to the balance state of the entire building.

Furthermore, since the lead rubber plug is not inserted into the laminated rubber 2, there is no cross-sectional defect in the steel sheet constituting the laminated rubber 2, and the stress of the steel sheet at the time of large deformation can be suppressed. Deformation performance can be improved.
And in this seismic isolation apparatus 1, since it is the structure which fastens the attachment bases 6A and 6B to the flange plates 4 and 5 by bolting, the low yield point steel plate 3 is attached to the attachment bases 6A and 6B as in this embodiment. Is used as the damping unit 10, the low yield point steel plate 3 can be easily attached to and detached from the laminated rubber 2.
In the seismic isolation device 1, the low yield point steel plate 3 has an arc plate shape that curves along the outer peripheral shape of the laminated rubber 2, and the low yield point steel plate 3 is subjected to the same deformation as the shear deformation of the laminated rubber 2. Therefore, the attenuation effect can be further enhanced.

  In the seismic isolation device according to the above-described embodiment, the damping performance of the low yield point steel plate 3 can be added without deteriorating the load bearing performance of the laminated rubber 2 and an optimum seismic isolation effect can be exhibited. Since the spot steel plate 3 is detachably provided at the position on the outer peripheral side of the laminated rubber 2 and the structure for simplifying the attaching and detaching operation of the low yield point steel plate 3 to the laminated rubber 2 is changed, the installation position of the low yield point steel plate 3 is changed. The attenuation performance can be easily adjusted by increasing or decreasing the number of installations. Moreover, since the low yield point steel plate 3 can be visually confirmed and the attachment / detachment work at the time of inspection becomes easy, the inspection work can be simplified.

  Next, modifications of the above-described embodiment will be described with reference to the accompanying drawings. However, the same or similar members and parts as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted. A configuration different from the form will be described.

FIG. 5 is a horizontal sectional view of a seismic isolation device according to a modification of the embodiment, and corresponds to FIG.
The seismic isolation device 1 according to the modification shown in FIG. 5 has a configuration in which the shape of the low yield point steel plate is changed. That is, in the above-described embodiment, the shape of the low yield point steel plate 3 (see FIG. 3) is an arc plate shape. In this modification, instead of this, a flat plate is formed, and the plate surface is laminated rubber in plan view. 2 is a structure using a low yield point steel plate 8 arranged in the tangential direction of the outer periphery of No. 2. The material of the low yield point steel plate 8 is the same material as in the embodiment. The mounting base 9 has a rectangular shape in plan view corresponding to the low yield point steel plate 8. And in this modification, the attenuation unit 20 (20A-20D) which integrated the upper and lower pair attachment base 9 and the low yield point steel plate 8 integrally is comprised.
In this modified example, the same actions and effects as those of the above-described embodiment can be obtained, and a plurality of low yield point steel plates 8, 8,... Can be arranged along the outer peripheral side of the laminated rubber 2. The low yield point steel plate 8 at this time is subjected to the same deformation as the shear deformation of the laminated rubber 2, and the damping effect can be further enhanced.

As mentioned above, although embodiment of the seismic isolation apparatus by this invention was described, this invention is not limited to said embodiment, In the range which does not deviate from the meaning, it can change suitably.
For example, in the present embodiment, four attenuation units 10A to 10D (low yield point steel plates 3, 3,...) Or modified attenuation units 20A to 20D (low yield point steel plates 8, 8) are provided on the outer peripheral side of the laminated rubber 2. ,... Are arranged, but is not limited to this arrangement quantity, and may be three, or five or more. In this embodiment, the damping units 10A to 10D (low yield point steel plates 3, 3,...) Or the modified attenuation units 20A to 20D (low yield point steel plates 8, 8,. For example, the low yield point steel plates 3 divided into two or four in the circumferential direction along the outer periphery of the laminated rubber 2 are in contact with each other without any gap, that is, the laminated rubber 2. A structure in which the low yield point steel plates 3 are arranged over the entire circumference of the outer peripheral side may be used. In short, the quantity and position of the damping units 10 and 20 (low yield point steel plates 3 and 8) can be arbitrarily set according to the damping performance required for the building (structure).

In the present embodiment, the low yield point steel plates 3 and 8 and the mounting bases 6 and 9 are fixed by fixing means such as welding, but may be fixed in a detachable state by bolt fastening or the like.
Furthermore, the fixing structure between the mounting bases 6 and 9 and the flange plates 4 and 5 of the laminated rubber 2 is not limited to the structure by bolt fastening as in this embodiment, and may be a pin structure, for example. .

It is a sectional side view of the seismic isolation apparatus by embodiment of this invention. It is a side view of the seismic isolation apparatus shown in FIG. It is the sectional view on the AA line shown in Drawing 1, and is a figure which omitted a bolt. It is a sectional side view which shows the state of the seismic isolation apparatus at the time of a deformation | transformation, Comprising: It is a figure corresponding to FIG. It is. It is a horizontal sectional view of the seismic isolation device by the modification of embodiment, Comprising: It is a figure corresponding to FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seismic isolation device 2 Laminated rubber 3, 8 Low yield point steel plate 4, 5 Flange plate 6, 6A, 6B, 9 Mounting base 6a Bolt hole 7 Bolt 10, 10A, 10B Damping unit 20 20A, 20B Damping unit

Claims (4)

A seismic isolation device having a laminated rubber with flange plates fixed on both upper and lower end faces,
Around the outer peripheral side of the laminated rubber, a low yield point steel plate having mounting bases at both upper and lower ends is arranged,
The seismic isolation device, wherein the mounting base is fixed to the flange plate in a removable state.   2. The seismic isolation device according to claim 1, wherein the low yield point steel plate has an arc plate shape that curves along an outer periphery of the laminated rubber.   2. The seismic isolation device according to claim 1, wherein the low yield point steel plate is a flat plate and the plate surface is arranged in a tangential direction of the outer periphery of the laminated rubber in a plan view.   The seismic isolation device according to any one of claims 1 to 3, wherein a damping unit in which the low-yield-point steel plate is integrally incorporated between a pair of upper and lower mounting bases is formed.

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