JP2512820B2 - Vibration isolation device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vibration isolator having an elastic body for supporting a building, or a vibration isolator also having a damper for damping the vibration of the elastic body. In the above, the present invention relates to a vibration isolation device that softly sits a building that has been displaced by the horizontal displacement of the elastic body to prevent the elastic body from sinking and to control the horizontal displacement.

<< Prior Art >> In a vibration isolation device that includes an elastic body that supports a building so that it can be displaced horizontally and a damper that damps the horizontal vibration of the elastic body, there is a limit to the horizontal displacement of the elastic body. , If the amount of displacement is too large, the subsidence will increase rapidly and the supporting rigidity will decrease sharply. Therefore, for example, as disclosed in Japanese Patent Application No. 63-255973 by the applicant of the present application, a building is provided on the foundation side. We have proposed a landing device that provides a support at a predetermined distance from the base and softly seats the building that has been displaced by the horizontal displacement of the elastic body on the support, thereby preventing the sinking. At the same time, the horizontal displacement was controlled.

<Problems to be Solved by the Invention> However, in such a proposal, the elastic body is generally made of so-called laminated rubber in which a large number of rubber plates and steel plates are alternately laminated, and the rubber plate undergoes aging deformation, that is, for many years. Since the so-called creep (shrinkage) occurs due to the gradual contraction deformation due to the use of, the laminated rubber that is an elastic body gradually sinks as the creep progresses, and between the upper surface of the support and the building when the landing gear is installed. Since the set clearance (clearance) is reduced, there is a possibility that reliable vibration isolation performance cannot be secured. Also, depending on the amount of creep, the above clearance may be lost, and the load (building) supported by the elastic body may always be supported by the support of the landing gear. There was a risk that it would stop working.

The present invention has been made in view of the background as described above, and it is possible to allow the sinking due to creep and to appropriately maintain the clearance following the creep, and to improve the vibration isolation performance over many years. The purpose is to provide a vibration isolation device capable of preventing deterioration.

It is another object of the present invention to provide a vibration isolation device that enables a landing gear to ensure its function by omitting a damper that damps the energy of horizontal vibration by engaging with a building and a foundation.

<< Means for Solving the Problem >> In order to achieve the above object, the present invention provides a vibration isolator that attenuates energy of horizontal vibration by having an elastic body that supports a building so that the building can be horizontally displaced. A structure for receiving and supporting a building that has been displaced by subsiding due to horizontal displacement, and a sliding plate that is fixed to the relative surfaces of the building, and an upper support that contacts during the displacement of the building A lower support that elastically supports the upper support, and a holding means that surrounds the upper support from the base side and prevents horizontal displacement due to contact between the upper support and the slide plate and pressure. It is characterized by having and.

Further, it is also characterized in that a plurality of level adjusting plates are laid so as to be able to increase and decrease between the lower support and the foundation.

<Operation> With the above configuration, when the building is submerged and displaced,
In other words, when the elastic body that supports the building sinks due to horizontal displacement due to an earthquake, etc., the sliding plate fixed to the relative surface of the building comes into contact with the upper support, and Exert function. At this time, the upper support is elastically supported by the lower support, and along with this support, a friction braking force (supporting force x friction coefficient) is obtained, and at the same time, the lower support elastically acts to buffer the effect. Therefore, even if the clearance set between the upper support and the building (sliding plate) is reduced due to creep,
The slide plate is softly seated on the elastically supported upper support, and the clearance is reduced, that is, sinking due to creep is allowed. Further, since the lower support elastically supports the upper support, it creeps similarly to the elastic body. That is, the lower support, which is supporting the upper support, also follows the elastic body and creeps, so that the contact pressure set between the upper support and the slide plate is appropriately maintained. Become. Here, the vertical spring constant (rigidity) of the elastic material of the upper support is set smaller than the vertical spring constant of the elastic body that supports the building.

On the other hand, since the level adjusting plate laid between the lower support and the foundation can be increased or decreased, the clearance or contact pressure can be positively reset by appropriately adjusting this.

<< Examples >> Examples of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional view of a building foundation portion showing the application of a preferred embodiment of the vibration isolator according to the present invention, and FIG. 2 shows an embodiment in the case where a damper is combined with the vibration isolator according to the present invention. FIG. 3 is a cross-sectional view of a building foundation portion, and FIG. 3 is an enlarged cross-sectional view of the vibration isolation device shown in FIGS. 1 and 2.

In the figure, 1 is a building forming a vibration-isolated structure, and 2 is a foundation of the building 1.

Between the building 1 and the foundation 2, an elastic body 3 that supports the building 1 so as to be horizontally displaceable, and a structure for the building 1 and the foundation 2 when the elastic body 3 receives a vibration force due to an earthquake or the like. A damper 4 for damping the energy of horizontal vibration in combination and a landing device 5 for receiving and supporting the building 1 which is displaced by the horizontal displacement of the elastic body 3 are provided. Is a set, and a large number of sets are appropriately arranged so that the building 1 is protected from vibration such as an earthquake, that is, forms a vibration-isolated structure. Further, with the clearance 1 set to zero, the lower support member is provided from the beginning.
When a suitable pressure is applied to the upper surface of 51 and the contact surface between the sliding plate 15 and the damper function due to sliding friction can be expected, the damper 4 can be omitted.

The elastic body 3 is configured as a so-called laminated rubber by alternately laminating a large number of flat plate-shaped rubber plates 30 and substantially the same shaped steel plates 31 on the rubber plate 30, and end plates 32 are provided at the upper and lower ends thereof, respectively. The upper and lower end plates 32 are fixedly attached to the building 1 and the foundation 2, respectively. As a result, the elastic body 3 supports the vertical load of the building 1 and elastically deforms with respect to the horizontal load, and allows relative displacement of the building 1 and the foundation 2 in both the horizontal and vertical directions.

In the damper 4, a steel rod 40 is erected on the foundation 2 via a mounting plate 41, and a concave portion 14 is provided on the relative surface of the building 1, and the tip of the steel rod 40 is provided in the concave portion 14 at a predetermined position. It is loosely fitted in the gap. Due to this, when the elastic body 3 is subjected to vibration due to an earthquake or the like, if the relative horizontal displacement between the building 1 and the foundation 2 becomes equal to or more than the gap between the tip of the steel rod 40 and the recess 14, the damper 4 is made of steel. 40 will be engaged with the building 1 and the foundation 2, and the energy of the horizontal vibration will be attenuated by the plastic deformation of the steel rod 40.

The landing device 5 basically includes the sliding plate 15 fixed to the relative surfaces of the building 1, the upper support 50 that is contacted when the building 1 is submerged and displaced, and the upper support 50 described above. A lower support body 51 elastically supported by the elastic body and a homogeneous member,
The upper support body 50 is surrounded by the base 2 and is provided with a holding base 52 that serves as a holding means for preventing horizontal displacement due to contact between the upper support body 50 and the sliding plate 15. A plurality of level adjusting plates 53 are provided between the base 2 and the foundation 2.
Are piled up and down so that they can be increased and decreased.

The upper support 50 is made of a member such as Teflon which has appropriate support rigidity and friction. When the damper 4 is installed, a member such as Teflon having a relatively small friction coefficient is used. However, when the damper 4 is not installed, a member such as stainless steel having a relatively large friction coefficient and large energy absorption is used. Used for the upper support 50. And the lower support
The upper support 50 has upper and lower ends of a rubber plate 510 of substantially the same shape fixed to a steel plate 511 of substantially the same shape, and elastically supports the upper support 50 placed above. Further, a holding base 52 is arranged around the upper support body 50 so as to surround the upper support body 50, and the holding base 52 allows the upper support body 50 to move up and down due to the elastic action of the lower support body 51. Though
Horizontal displacement will be prevented.

In addition, when the damper 4 is installed, a predetermined clearance 1 is set between the upper surface of the upper support 50 on the side of the foundation 2 and the sliding plate 15 on the lower surface of the opposing building 1, and both are usually set. Is non-contact, and when the damper 4 is not installed, an appropriate pressure is applied as a contact state.

Therefore, according to such a configuration, when the building 1 is submerged and displaced, that is, when the elastic body 3 supporting the building 1 is submerged due to horizontal displacement due to an earthquake or the like, the upper support 50 is elastically supported by the lower support 51,
The rubber plate 510 of the lower support body 51 elastically exerts a cushioning effect. Even if creeping, the sliding plate 15 can slide on the upper surface of the elastically supported upper support 50,
Subduction will be allowed. That is, FIG. 4 is a characteristic diagram showing the amount of subsidence Z with respect to the horizontal displacement X of the elastic body 3, and FIG. 5 is a characteristic diagram showing the horizontal displacement X with respect to the horizontal shearing force Q of the elastic body 3. , As shown in the figure,
As the creep progresses to 5%, 8%, ... with respect to the total thickness of the rubber plate 30 forming the elastic body 3, the subsidence amount Z increases and the shearing force Q, that is, the rigidity increases, but the vibration isolation performance is improved. Not to the extent of being obstructed, the sinking due to creep can be tolerated as long as the lower support 51 can buffer it.

Further, since the lower support 51 supports the upper support 50 by the rubber plate 30 of the elastic body 3 and the rubber plate 510 which is a homogeneous member, it creeps similarly to the elastic body 3. That is, the lower support 51, which is supporting the upper support 50, also follows the elastic body 3 and creeps. That is, it is possible to follow the creep, which makes it possible to maintain the vibration isolation performance in a good state for many years and compensate for the deterioration.

On the other hand, since the level adjusting plate 53 laid between the lower support 51 and the foundation 2 can be increased or decreased, the clearance 1 or the contact pressure can be positively reset by appropriately adjusting this. That is, the clearance l or the contact pressure can be appropriately maintained by following the creep by positive adjustment.

The friction on the upper surface of the upper support 50 is appropriately set, and when the building 1 is landed, that is, when the sliding plate 15 on the lower surface of the building 1 contacts the upper surface of the upper support 50,
A moderate amount of slip braking force is exerted with respect to the horizontal displacement, whereby a damper action for attenuating the energy of horizontal vibration is also exerted. In this case, the damper 4 can be omitted.

<< Effects of the Invention >> As described above in detail in the embodiments, according to the vibration isolator of the present invention, the upper support is elastically supported by the lower support, and the lower support elastically acts. Since the cushioning effect is exerted, even if the clearance set with the building (sliding plate) disappears due to creep, the sliding plate is softly seated on the upper support. Therefore, the sinking due to creep can be tolerated to the extent that the lower support can buffer. Further, the lower support member creeps like the elastic member, and creeps following the elastic member, so that the clearance is appropriately maintained. As a result, the vibration isolation performance can be maintained in a good state for many years, and the deterioration can be compensated.

On the other hand, since the level adjustment plate can be increased / decreased, it can be positively reset by appropriately adjusting it, and the damper function can be appropriately maintained.

[Brief description of drawings]

FIG. 1 is a sectional view of a building foundation portion showing an application of an embodiment of the present invention, FIG. 2 is a sectional view of a building foundation portion showing an application of another embodiment of the present invention, and FIG. An enlarged sectional view of the vibration isolator shown in FIG. 1, and FIGS. 4 and 5 are operational characteristic diagrams. 1 ... Building, 2 ... Foundation 3 ... Elastic body, 4 ... Damper 5 ... Landing device, 15 ... Sliding plate 50 ... Upper support, 51 ... Lower support 52 ... Holding means ( Holding base) 53 …… Level adjustment plate

Front page continuation (72) Inventor Mitsuru Ohira 1-9-13 Akasaka, Minato-ku, Tokyo Power Reactor and Nuclear Fuel Development Corp. (72) Inventor Shigeo Higaki 1-9-13 Akasaka, Minato-ku, Tokyo Power (72) Inventor Akira Teramura 4-640 Shimo-Seido, Kiyose-shi, Tokyo Inside the Obayashi Technical Research Institute (72) Inventor Tomohiko Tsunoda 4-640, Shimo-Seido, Kiyose-shi, Tokyo Stock company Obayashi Technical Research Institute (72) Inventor Takashi Nakamura 4-640 Shimoseido, Kiyose City, Tokyo Incorporated company Obayashi Technical Research Institute

Claims (2)

(57) [Claims] 1. A vibration isolator for damping a horizontal vibration energy by having an elastic body that supports a building so that the building can be horizontally displaced. A sliding plate fixed to a relative surface of a building, an upper support body to be brought into contact when the building is submerged and displaced, and a lower support body elastically supporting the upper support body. A vibration isolator, comprising: a holding means that surrounds the upper support from the base side to prevent horizontal displacement due to contact between the upper support and the sliding plate and pressure. 2. The vibration isolator according to claim 1, wherein a plurality of level adjusting plates are laid so as to be able to increase and decrease between the lower support and the foundation.