JP2001074094A - Seismic isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain lowering of a base isolation effect as much as possible on an upper part stage without reducing the maximum static friction coefficient of a sliding part against a sliding type base isolation device. SOLUTION: A support body 3 to support an upper plate 1 free to relaively slide in the horizontal direction against a lower plate 2 is made by alternately laminating a plurality of resin plates 3a and metal plates 3b in the vertical direction and interposing elastic sheet members 3c between the metal plates 3b and the resin plates 3a adjacent to one of upper sides and lower sides of the metal plates 3b, and the metal plates 3b and the resin plates 3a adjacent to the opposite side of the elastic sheet members 3c of the metal plates 3b are made to slide in the horizontal direction each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a seismic isolation device which is provided between a superstructure such as a building and a foundation and suppresses the vibration of the superstructure due to an earthquake.

[0002]

2. Description of the Related Art Conventionally, various types of seismic isolation devices of this type have been proposed.
As shown in JP-A-143-143, a load supporting function and a sliding function are provided between an upper plate connected to an upper structure and a lower plate connected to a foundation. It has been proposed to provide a bearing plate (which is slidably supported in the horizontal direction relative to the bearing) and seal the bearing plate with a cylindrical rubber spring. In such a sliding type seismic isolation device, the upper plate slides in the horizontal direction with respect to the lower plate by the bearing plate when an earthquake occurs, so that the sudden vibration is lengthened and reduced, and after the earthquake converges. The upper plate and the upper structure can be returned to the positions before sliding by the restoring force of the rubber spring. Further, the dynamic frictional force of the sliding portion acts as a damping force, and converges the vibration at an early stage.

[0003]

However, in the case of the sliding type as in the above proposed example, when the sliding portion shifts from the stationary state due to the static friction force to the dynamic friction state immediately after the occurrence of the earthquake, the upper plate is moved. Because of the sudden movement, a large acceleration change occurs in the upper plate. The change in acceleration of this upper plate is
Because it is sufficiently smaller than the acceleration change of the seismic motion, the seismic isolation device can provide sufficient seismic isolation effect on the first floor of the building, but the horizontal vibration acceleration increases due to the acceleration change of the upper plate on the upper floor, There is a problem that the vibration reduction effect of the seismic isolation device is reduced. Such a tendency becomes remarkable especially in a two- or three-story lightweight building such as a wooden house.

On the other hand, if the maximum static friction coefficient of the sliding portion is considerably reduced, it is possible to reduce the change in acceleration of the upper plate when the sliding portion shifts from the stationary state to the dynamic friction state. In this case, the dynamic friction coefficient becomes small, a predetermined damping force cannot be obtained, and there is a problem that the vibration is difficult to stop.

The present invention has been made in view of the above points, and an object of the present invention is to improve the structure of the above-mentioned sliding type seismic isolation device by improving its structure. It is an object of the present invention to suppress a decrease in seismic isolation effect on the upper floor as much as possible without reducing the maximum static friction coefficient so that a good seismic isolation effect can be obtained on any floor.

[0006]

In order to achieve the above object, according to the present invention, a support for supporting an upper plate so as to be slidable in a horizontal direction relative to a lower plate is provided by a plurality of resin plates. An elastic sheet member is interposed between the metal plate and a resin plate adjacent to one of the upper and lower sides of the metal plate and the metal plate, and the metal plate is alternately stacked in the vertical direction. The metal plate and the resin plate adjacent to the metal plate on the side opposite to the elastic sheet member can slide in the horizontal direction with respect to each other.

Specifically, according to the first aspect of the present invention, the upper plate connected to the upper structure, the lower plate provided opposite the lower side of the upper plate and connected to the foundation, and A support that is provided at a portion other than the outer peripheral portion between the plate and the lower plate and supports the upper plate so as to be slidable in the horizontal direction relative to the lower plate,
An elastic body which elastically connects at least a part of the outer peripheral portions of the upper plate and the lower plate, and which is deformed when the upper plate slides relative to the lower plate in a horizontal direction, It is intended for seismic isolation devices that suppress the shaking of the upper structure due to an earthquake.

[0008] The support is formed by stacking a plurality of resin plates and a metal plate alternately in the vertical direction, and forming the metal plate and a resin plate adjacent to one of the upper and lower sides of the metal plate. An elastic sheet member is interposed therebetween, and the metal plate and a resin plate adjacent to the metal sheet on the side opposite to the elastic sheet member are configured to be able to slide in a horizontal direction with respect to each other. Shall be

According to the above configuration, the resin plate and the metal plate of the support slide relatively horizontally in the event of an earthquake. At this time, the resin plate and the metal plate move upward relative to the lower plate. The upper plate slides largely horizontally, and the upper plate moves relative to the lower plate by approximately the same amount of relative movement between the resin plate or metal plate located at the top of the support and the resin plate or metal plate located at the bottom. It slides horizontally in the horizontal direction to make the sudden vibration longer and softer. After the convergence of the earthquake, the upper plate and the upper structure can be returned to the positions before sliding by the restoring force of the elastic body. Immediately after the earthquake, before the sliding portion shifts from the stationary state to the kinetic friction state, the elastic sheet member shears in the horizontal direction. Due to the deformation, the upper plate slightly moves in the horizontal direction relatively to the lower plate, and it is possible to suppress a large acceleration change from occurring in the upper plate even when the sliding portion shifts to the dynamic friction state. As a result, it is possible to suppress a decrease in the seismic isolation effect on the upper floor without reducing the maximum static friction coefficient of the sliding portion.

According to a second aspect of the present invention, in the first aspect of the invention, the elastic sheet member of the support is fixed to the upper and lower both sides of the resin plate and the metal plate, and the outer diameter of the metal plate is larger than that of the resin plate. Is also set small.

Thus, it is possible to prevent the metal plate having a large inertia from sliding largely in the horizontal direction and locally deforming the elastic body largely. Further, by making the outer diameter of the metal plate smaller than that of the resin plate, it is possible to reliably prevent the metal plate from contacting the elastic body. Therefore, it is possible to prevent the elastic body from being damaged by the metal plate.

According to a third aspect of the present invention, in the second aspect of the invention, each corner of the outer peripheral surface and the upper and lower surfaces of the resin plate in the support is chamfered. With this,
Even if the resin plate abuts against the elastic body, the elastic body does not break at the corners, and it is possible to reliably prevent the function of the elastic body from being hindered during the operation of the seismic isolation device.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the coefficient of kinetic friction between the resin plate and the metal plate slidable in the horizontal direction in the support is 0.0.
It is assumed that the value is set to 3 to 0.2.

That is, if the coefficient of kinetic friction between the resin plate and the metal plate is smaller than 0.03, it is difficult to reduce the vibration. On the other hand, if it is larger than 0.2, the seismic isolation effect is sufficient unless the earthquake has a large seismic intensity. 0.03 to 0.
It is 2. In order to obtain a dynamic friction coefficient of such a value, for example, the resin plate may be made of a lubricating resin or the like, and the metal plate may be made of stainless steel or the like, and further, a silicone oil or grease is applied between the resin plate and the metal plate. To adjust that value.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention, the elastic body connects the entire outer circumferences of the upper plate and the lower plate and covers the support over the entire circumference. It shall consist of a cylindrical rubber member.

According to the present invention, regardless of the direction in which the upper plate slides with respect to the lower plate, a stable restoring force having no directivity is generated in the cylindrical rubber member, and dust is formed on the sliding portion of the support. Since dust and dust can be prevented from entering, stable slidability can be maintained for a long period of time.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, resin plates are respectively disposed on the uppermost portion and the lowermost portion of the support, and the outer diameters of the two resin plates are smaller than those of the other resin plates. It has been set.

That is, since the connection between the upper and lower plates of the rubber member is a portion where a large stress is generated and stress concentration is apt to occur, the resin plates disposed on the uppermost and lowermost portions of the support are provided. Are easily damaged by the contact. But,
According to the present invention, since the outer diameter of the resin plate disposed at the uppermost portion and the lowermost portion of the support is smaller than that of the other resin plates, both resin plates are used as connecting portions between the upper plate and the lower plate of the rubber member. It is possible to prevent the rubber member from being brought into contact, and it is possible to prevent the rubber member from being damaged. Even if the two resin plates abut against the rubber member, the degree of damage to the rubber member is smaller than when the metal plate abuts, and the rubber member can be effectively protected.

According to a seventh aspect of the present invention, in the sixth aspect of the invention, the two resin plates disposed at the uppermost portion and the lowermost portion of the support are fixed to the lower surface of the upper plate and the upper surface of the lower plate, respectively. Shall be.

By doing so, it is possible to reliably prevent the resin plate from damaging the connecting portion between the upper and lower plates of the rubber member, and to make the connecting portion thicker than the other portions. Strength can be improved, and damage due to repeated deformation of the connection portion can also be prevented.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a seismic isolation device A according to an embodiment of the present invention. The seismic isolation device A is provided between an upper structure such as a building and a foundation, and shakes the upper structure against an earthquake. In particular, when the building is a two-story or three-story lightweight building such as a wooden house, a good seismic isolation effect is exhibited at any floor. The seismic isolation device A includes a circular stainless steel upper plate 1 connected to the upper structure, and a lower surface of the upper plate 1 opposed to the circular plate, and a circular stainless steel upper plate 1 connected to the foundation. And a lower plate 2.

A support 3 for supporting the upper plate 1 slidably in the horizontal direction relative to the lower plate 2 is provided at a portion other than the outer peripheral portion between the upper plate 1 and the lower plate 2. I have. This support 3 is composed of five circular resin plates 3a and four circular metal plates 3b alternately stacked in the vertical direction (the uppermost and lowermost portions of the support 3 are resin plates 3a) and the metal plate Between the plate 3b and the resin plate 3a adjacent to one of the upper and lower sides of the metal plate 3b (the resin plate 3a at the center in the vertical direction).
The upper metal plate 3b is between the upper adjacent metal plate 3a and the lower upper metal plate 3b than the middle resin plate 3a, and the lower adjacent metal plate 3a is adjacent to the lower adjacent resin plate 3a. (Circle), a circular elastic sheet member 3c is interposed. The metal plate 3b and the resin plate 3a adjacent to the metal plate 3b on the side opposite to the elastic sheet member 3c are slid in a horizontal direction when a horizontal force greater than the maximum static frictional force acts therebetween. It is made to move.
In FIG. 1, for convenience of description, a gap is drawn between the slidable resin plate 3a and the metal plate 3b (the same applies to FIGS. 3, 4 and 5).

The elastic sheet member 3c is made of synthetic rubber, natural rubber, low elasticity thermoplastic resin or the like, and has a thickness of 1 to 10 mm. The elastic sheet member 3c is made of a resin plate 3a and a metal plate 3b on both upper and lower sides.
Is fixed with an adhesive (epoxy-based, cyan-based, or the like) to be integrated with the resin plate 3a and the metal plate 3b. In addition, only the resin plate 3a at the center in the vertical direction is provided independently.

The outer diameter of the metal plate 3b is set to be substantially the same as that of the elastic sheet member 3c and smaller than that of the resin plate 3a, and the outer periphery of the resin plate 3a is formed by the outer periphery of the metal plate 3b and the outer periphery of the elastic sheet member 3c. It protrudes radially outward from the surface. The uppermost and lowermost resin plates 3a are fixed to the lower surface of the upper plate 1 and the upper surface of the lower plate 2 by an adhesive, respectively, and the outer diameters of both resin plates 3a are the other three resin plates 3a.
It is set smaller than a. Furthermore, each corner of the outer peripheral surface and the upper and lower surfaces of the resin plate 3a is chamfered and rounded.

The resin plate 3a is made of a lubricating resin such as ultrahigh molecular weight polyethylene, high density polyethylene, nylon, polytetrafluoroethylene, polyacetal, etc., and is used as a reinforcing material for these resins so as to withstand high compression. Glass fibers, aramid fibers, carbon fibers, metal oxide whiskers may be contained, and further, a lubricant may be contained. On the other hand, the metal plate 3b is made of stainless steel, and the kinetic friction coefficient between the slidable resin plate 3a and the metal plate 3b is set to 0.03 to 0.2. If the coefficient of kinetic friction between the resin plate 3a and the metal plate 3b is smaller than 0.03, it is difficult to suppress the vibration, while if it is larger than 0.2, the seismic isolation effect is sufficient unless the earthquake has a large seismic intensity. Because it is not demonstrated. The dynamic friction coefficient may be adjusted by applying silicon oil or grease between the resin plate 3a and the metal plate 3b. Further, a concave groove for heat dissipation during sliding may be provided on each sliding surface of the resin plate 3a and the metal plate 3b.

The entire periphery of the upper plate 1 and the lower plate 2 is formed by a cylindrical rubber member 8 covering the support 3 over the entire periphery.
(Elastic body) for elastic connection. That is, the upper end of the rubber member 8 is vulcanized and bonded to the outer peripheral portion of the upper plate 2, while the lower end is vulcanized and bonded to a ring member 6 made of stainless steel. Are fixed to each other by a plurality of screws 7. Thus, the space between the upper plate 1 and the lower plate 2 is made substantially closed. The rubber member 8 is made of a compounded rubber mainly composed of a natural rubber or a synthetic rubber or a composite material in which any one of the compounded rubbers is reinforced with fibers, and has a breaking elongation of 600% or more. And the rubber member 8
When the upper plate 1 slides in any direction in the horizontal direction relative to the lower plate 2, the upper plate 1 is extended to generate a restoring force for returning the upper plate 1 to the position before the sliding. Also,
The upper and lower ends of the rubber member 8 are formed in an arc shape so that the thickness thereof is smoothly thicker than the center in the vertical direction, and when the upper plate 1 slides horizontally with respect to the lower plate 2. The stress concentration is reduced. In this embodiment, the inner diameter of the rubber member 8 except for the upper and lower ends is set to be substantially the same as the outer diameter of the three resin plates 3a other than the uppermost and lowermost portions of the support 3.

A method of assembling the seismic isolation device A having the above configuration will be described with reference to FIG. First, the upper plate 1 is vulcanized and adhered to the upper end surface of the rubber member 8, and the ring member 6 is vulcanized and adhered to the outer peripheral portion of the lower end portion, thereby forming the accommodating portion of the support 3.

Subsequently, the four resin plates 3a, the metal plate 3b, and the elastic sheet member 3c, which are fixed in advance with an adhesive, and one resin plate 3a positioned at the center in the vertical direction are placed in the housing portion. At this time, an adhesive is applied to the upper surface of the uppermost resin plate 3a in advance, and the uppermost resin plate 3a is fixed to the upper plate 1 with the adhesive.

Next, after an adhesive is applied to the lower surface of the lowermost resin plate 3a, the lowermost resin plate 3a
Is fixed to the lower plate 2 and the lower plate 2 is
Then, the seismic isolation device A is completed.

When the seismic isolation device A is provided between the upper structure and the foundation, the upper plate 1 is fixed to the upper structure and the lower plate 2 is fixed to the foundation by bolts or the like. If the seismic isolation device A is provided between the upper structure and the foundation in this way, the resin plate 3a and the metal plate 3b of the support 3 slide relatively horizontally in the event of an earthquake. At this time, as shown in FIG. 3, the resin plate 3a and the metal plate 3b slide horizontally more largely with respect to the lower plate 2 as they are located on the upper side. Resin plate 3a located at the bottom
The upper plate 1 slides relatively with respect to the lower plate 2 by substantially the same amount of relative movement as that described above, so that the sudden vibration is lengthened and reduced.
As a result, horizontal vibration of the upper structure can be suppressed,
The object installed inside the building can be prevented from falling down. Further, since the rubber member 8 is deformed and stretched in the direction in which the upper plate 1 is displaced from the lower plate 2, a restoring force is generated in the rubber member 8 to return the upper plate 1 to the position before sliding, and the earthquake converges. Thereafter, the restoring force allows the upper plate 1 and the upper structure to return to the positions before sliding. Since the same restoring force is generated when the upper plate 1 slides in any direction in the horizontal direction with respect to the lower plate 2, the rubber member 8 functions in the same manner against seismic force from any direction. Can be done.

Then, immediately after the occurrence of the earthquake, the resin plate 3a
When the sliding surfaces of the metal plate 3b are in a stationary state, the elastic sheet member 3c is sheared in the horizontal direction as shown in FIG. 4, so that the resin plate 3a and the metal plate 3b do not slide. Also, due to the shear deformation of the elastic sheet member 3c, the upper plate 1 slightly moves in the horizontal direction relatively to the lower plate 2, and even if the sliding surfaces shift to the kinetic friction state, the upper plate 1 Large acceleration change can be suppressed. As a result, a decrease in the seismic isolation effect on the upper floor can be suppressed without reducing the maximum static friction coefficient between the sliding surfaces, and a good seismic isolation effect can be obtained on any floor.

By appropriately setting the outer diameters of the resin plate 3a and the metal plate 3b, the resin plate 3a and the metal plate 3b
The pressure received from the upper structure can be made relatively small, and even if a force oblique to the horizontal direction is applied to the seismic isolation device A due to the inclination of the upper structure or the like, the support 3
Can be prevented from occurring, that is, the so-called rocking phenomenon that a brake is applied to the sliding between the resin plate 3a and the metal plate 3b due to the inclination. That is, when the support 3 is not a laminate as in the above embodiment and the upper surface of the support 3 slides on the upper plate 1 or the lower surface of the support 3 and the lower plate 2, Although the rocking phenomenon easily occurs due to the inclination, the support 3 is a laminated body and the sliding portions are provided at several places as in the above-described embodiment. Sliding surely.

Further, sliding between the resin plate 3a and the metal plate 3b is possible as long as the uppermost resin plate 3a and the lowermost resin plate 3a are vertically overlapped. The relative movement distance between the upper plate and the lower plate can be increased without increasing the number of layers with 3b. Although there is almost no gap between the rubber member 8 and the three resin plates 3a other than the uppermost and lowermost portions of the support 3, the resin plate 3a
The rubber member 8 slides more horizontally with respect to the lower plate 2 as it is positioned higher along the rubber member 8, so that the rubber member 8 is smoothly deformed in the vertical direction, and the metal plate 3 b is A resin plate 3a adjacent to one of the upper side and the lower side of 3b is fixed via an elastic sheet member 3c, and each corner between the outer peripheral surface and the upper and lower surfaces of the resin plate 3a is chamfered. Therefore, the rubber member 8 is not damaged by the resin plate 8a or the metal plate 8b. As a result, the outer diameter and height of the seismic isolation device A can be made relatively small.
If a lubricant such as silicone oil or grease is applied to the inner peripheral surface of the rubber member 8, the outer peripheral surface of the resin plate 3 a and the inner peripheral surface of the rubber member 8 can be smoothly slid, and the resin plate 3 a Sliding between the metal member 3b and the deformation of the rubber member 8 can be satisfactorily performed.

Further, both resin plates 3a disposed on the uppermost and lowermost portions of the support 3 are fixed to the lower surface of the upper plate 1 and the upper surface of the lower plate 2, respectively. Since the diameter is set smaller than the other three resin plates 3a, the two resin plates 3a do not abut on the respective connecting portions (upper and lower ends) of the rubber member 8 with the upper plate 1 and the ring member 6. The rubber member 8 can be effectively protected, and the uppermost resin plate 3
The thickness can be made thicker than other parts by the smaller the outer diameter of a, and the strength can be improved.

In the above embodiment, the elastic sheet member 3c of the support 3 is bonded to the upper and lower resin plates 3 by an adhesive.
Although the three members are fixedly attached to the metal plate 3a and the metal plate 3b, the elastic sheet member 3c may be slidable in the horizontal direction relatively to the resin plate 3a and the metal plate 3b. However,
Between the resin plate 3a and the elastic sheet member 3c and the metal plate 3b
If each coefficient of static friction between the elastic sheet member 3c and the elastic sheet member 3c is sufficiently larger than the coefficient of static friction between the resin plate 3a and the metal plate 3b, the above-mentioned three members can obtain static friction even without using an adhesive. It becomes a substantially integrated state only by force.

In the above embodiment, the corners of the outer peripheral surface and the upper and lower surfaces of the resin plate 3a are chamfered.
The same chamfering may be performed on b and the elastic sheet member 3c. This is because the elastic sheet member 3c can be slid with respect to the resin plate 3a and the metal plate 3b without using an adhesive as described above, or when the outer diameter of the metal plate 3b and the elastic sheet member 3c is It is particularly effective when it is substantially the same as the plate 3a or larger than the resin plate 3a.

In the above embodiment, the uppermost and lowermost resin plates 3a are fixed to the lower surface of the upper plate 1 and the upper surface of the lower plate 2, respectively. It may be configured to be slidable relative to the plate 2. In this case, it is desirable to further reduce the outer diameter of both resin plates 3a.

It is not necessary to provide the resin plate 3a at the uppermost and lowermost portions of the support 3, respectively, and the metal plate 3b and the elastic sheet member 3c may be provided at the uppermost and lowermost portions. In short, a metal plate 3b sandwiched between two resin plates 3a
An elastic sheet member 3c is interposed between the metal plate 3b and the resin plate 3a adjacent to either the upper side or the lower side of the metal plate 3b, and slides horizontally with respect to the resin plate 3a adjacent to the other side. If possible, the support 3 may be in any form.

In the above embodiment, the resin plate 3a of the support 3 is made of a lubricating resin, but the resin plate 3a and the metal plate 3b
Other resins may be used as long as the kinetic friction coefficient between the two can be set to 0.03 to 0.2.

Further, in the above embodiment, the inner diameter of the rubber member 8 except for the upper and lower ends is substantially equal to the outer diameter of the three resin plates 3a other than the uppermost and lowermost portions. A gap may be formed between the outer peripheral surface of the resin plate 3a and the inner peripheral surface of the rubber member 8. In this case, it is desirable that the outer diameter of the resin plate 3 a be 50% or more of the inner diameter of the rubber member 8.

In addition, in the above embodiment, the cylindrical rubber member 8 including the support 3 is used as the elastic body. However, for example, a plurality of coil springs may be arranged at substantially equal intervals in the circumferential direction. It is possible. Also, as shown in FIG. 5, a plurality of rubber layers 15a and a rigid plate layer 1 made of a steel plate or the like are used as the elastic body.
5b are alternately stacked in the vertical direction.
5 may be used. In this way, when the upper plate 1 slides relative to the lower plate 2 in the horizontal direction, the rubber layer 1
5a undergoes shear deformation to generate a shearing force, and this shearing force becomes a restoring force. In this case, the rubber layer 15a of the laminate 15
The relationship between the shear force generated in the above and the relative movement amount of the upper plate 1 and the lower plate 2 is compared with the relationship between the tensile force generated in the rubber member 8 and the relative movement amount of the upper plate 1 and the lower plate 2 in the above embodiment. It is close to linear and easy to handle. Further, a plurality of cylinders each having a rubber layer 15 and a rigid plate layer 15 laminated in the same manner as the above-mentioned laminate 15 and having a substantially small diameter substantially the same as the thickness of the laminate 15 are prepared. Alternatively, these columnar laminates may be arranged at substantially equal intervals in the circumferential direction on the outer peripheral portions of the upper plate 1 and the lower plate 2.

Here, vibration analysis was performed assuming that the seismic isolation device A of the above embodiment was laid in a two-story house having a total weight of 1.96 MN, and the vibration acceleration of each floor was examined. For comparison, a vibration analysis was also performed on a seismic isolation device that was substantially the same as the above embodiment except that the support 3 did not have the elastic sheet member 3c.

At this time, the natural period of the horizontal shear characteristic of the seismic isolation layer at the foundation portion on which both the seismic isolation devices are laid is 2.
7 seconds, and the equivalent rigidity was 0.98 MN / m. Assuming that the hysteresis loop is represented by a parallelogram as shown in FIG. 6, the inclination (referred to as primary stiffness) of two sides facing each other in the horizontal displacement axis direction varies depending on the presence or absence of the elastic sheet member 3c. The inclination (referred to as secondary rigidity) of two sides facing each other in the horizontal load axis direction was set to 0.57 MN / m.
Specifically, the ratio of the primary stiffness to the primary stiffness of the secondary stiffness is set to 0.3 when the elastic sheet member 3c is provided, and when the elastic sheet member is not provided (shown by a broken line in FIG. 6). ) Was set to 0.117. That is, the primary rigidity is 1.89 MN when the elastic sheet member is provided.
/ M, and 4.86 when there is no elastic sheet member. And the seismic waveform (vibration acceleration 500cm / s ² )
To calculate the horizontal vibration acceleration at each floor of the house.

As a result of the vibration analysis, the vibration acceleration of each floor is as shown in FIG. That is, when the elastic sheet member 3c is not provided, although the vibration reduction effect on the first floor is good, the acceleration at the ceiling on the second floor is 1.
It is considerably large at 58 times. On the other hand, when the elastic sheet member 3c is provided, although the vibration reduction effect on the first floor is slightly inferior, the acceleration ratio of the second floor ceiling portion to the first floor portion is 1.19, and the elastic sheet member 3c is provided. This shows that the seismic isolation effect on the upper floor can be prevented from lowering.

[0045]

As described above, according to the first aspect of the present invention, the support for slidably supporting the upper plate relative to the lower plate in the horizontal direction is provided by a plurality of resin plates and metal plates. And an elastic sheet member is interposed between the metal plate and a resin plate adjacent to one of the upper side and the lower side of the metal plate. And the resin sheet adjacent to the metal sheet on the side opposite to the elastic sheet member can slide in the horizontal direction with each other, so that even when the sliding portion shifts from the stationary state to the kinetic friction state, it remains on the upper plate. A large change in acceleration can be suppressed, and an increase in horizontal vibration acceleration on the upper floor can be suppressed as much as possible.

According to the second aspect of the present invention, the elastic sheet member of the support is fixed to the upper and lower resin plates and the metal plate, and the outer diameter of the metal plate is made smaller than that of the resin plate. The elastic body can be prevented from being damaged by the metal plate.

According to the third aspect of the present invention, since the corners of the outer peripheral surface and the upper and lower surfaces of the resin plate on the support are chamfered, the elastic body can be prevented from being damaged by the resin plate.

According to the fourth aspect of the present invention, by setting the dynamic friction coefficient between the resin plate and the metal plate slidable in the horizontal direction on the support at 0.03 to 0.2, the seismic intensity A good seismic isolation effect can be obtained even for earthquakes.

According to the fifth aspect of the present invention, the elastic body is made of a cylindrical rubber member that connects the entire outer circumferences of the upper plate and the lower plate and covers the support over the entire circumference. Thereby, the direction of the seismic force is not affected, and the dust and the dust do not enter the inside of the rubber member, so that a stable damping force and a restoring force can be secured for a long period of time.

According to the sixth aspect of the present invention, the resin plates are disposed at the uppermost portion and the lowermost portion of the support, respectively, and the outer diameters of the two resin plates are smaller than those of the other resin plates. (Rubber member) can be effectively protected.

According to the seventh aspect of the present invention, the two resin plates provided at the uppermost and lowermost portions of the support are fixed to the lower surface of the upper plate and the upper surface of the lower plate, respectively, so that the rubber member made of the resin plate is provided. To reliably prevent damage at the connection part with the upper plate or lower plate, and make the connection part thicker than other parts to prevent damage due to repeated deformation of the connection part. Can be.

[Brief description of the drawings]

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

FIG. 2 is an exploded view showing an assembling procedure of the seismic isolation device.

FIG. 3 is a view corresponding to FIG. 1, showing a state in which a resin plate and a metal plate of a support slide relatively horizontally in the event of an earthquake.

FIG. 4 is a diagram corresponding to FIG. 1 showing a state in which an elastic sheet member has been sheared and deformed immediately after the occurrence of an earthquake and before sliding between a resin plate and a metal plate.

FIG. 5 is a view corresponding to FIG. 1 showing a modification of the embodiment using a laminate as an elastic body.

FIG. 6 is a graph showing horizontal shear characteristics of a seismic isolation layer.

FIG. 7 is a graph showing a change in vibration acceleration at each floor.

[Explanation of symbols]

 A seismic isolation device 1 upper plate 2 lower plate 3 support 3a resin plate 3b metal plate 3c elastic sheet member 8 rubber member (elastic body) 15 laminated body (elastic body)

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Ippei Ota 3-2-15 Meiwadori, Hyogo-ku, Kobe-shi, Hyogo F-term in Bando Chemical Co., Ltd. 3J048 AC01 BA11 BD01 BD05 DA01 EA38

Claims (7)

[Claims] 1. An upper plate connected to an upper structure, a lower plate provided to face a lower side of the upper plate and connected to a foundation,
A support provided at a portion other than the outer peripheral portion between the upper plate and the lower plate to support the upper plate so as to be slidable in a horizontal direction relative to the lower plate; and an outer periphery of the upper plate and the lower plate. An elastic body that elastically connects at least a part of the portions to each other and deforms when the upper plate slides in a horizontal direction relatively to the lower plate, wherein the upper structure shakes due to an earthquake. In the seismic isolation device, the plurality of resin plates and metal plates are alternately stacked in the vertical direction, and the metal plate and one of the upper side and the lower side of the metal plate An elastic sheet member is interposed between adjacent metal plates, and the metal plate and a resin plate adjacent to the metal sheet on the side opposite to the elastic sheet member slide horizontally with respect to each other. A seismic isolation device characterized by being configured to be able to perform the operation. 2. The seismic isolation device according to claim 1, wherein the elastic sheet member of the support is fixed to a resin plate and a metal plate on both upper and lower sides thereof, and an outer diameter of the metal plate is smaller than that of the resin plate. A seismic isolation device that is set. 3. The seismic isolation device according to claim 2, wherein at each corner between the outer peripheral surface and the upper and lower surfaces of the resin plate in the support,
Seismic isolation device characterized by being chamfered. 4. The seismic isolation device according to claim 1, wherein a coefficient of kinetic friction between the resin plate and the metal plate slidable in the horizontal direction in the support is 0.03 to 0.2. A seismic isolation device characterized by being set to: 5. The seismic isolation device according to claim 1, wherein the elastic body connects the entire outer circumferences of the upper plate and the lower plate and covers the support over the entire circumference. A seismic isolation device comprising a rubber-like member. 6. The seismic isolation device according to claim 5, wherein a resin plate is disposed at an uppermost portion and a lowermost portion of the support, respectively, and the outer diameters of both resin plates are set smaller than other resin plates. A seismic isolation device characterized by the following. 7. The seismic isolation device according to claim 6, wherein both resin plates provided at the uppermost portion and the lowermost portion of the support are fixed to the lower surface of the upper plate and the upper surface of the lower plate, respectively. Characteristic seismic isolation device.