JP2002048190A - Lamination layer rubber for seismic isolation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control bending deformation of an outer circumferential edge part of an interior rigid plate and swelling of covering rubber in an outer circumferential direction due to shear compression under high contact pressure and large deformation, and to improve a buckling characteristic, fracture characteristic and histeresis restoring force characteristic. SOLUTION: In a lamination layer rubber for seismic isolation 10 formed by covering with the covering rubber 5 the periphery whole area of a lamination layer body 4 made up by laminating a plurality of rigid plates 2... and rubber- like elastic plates 3... alternately between thick rigid plates 1, 1 to which mounting flanges 6, 6 are retrofittable by way of shear keys 7, 7, the lamination layer rubber 10 is further constructed in which rings 8, 8 made by hard material which hold edge portions 5a of the covering rubber 5 restrictively are arranged between the thick rigid plates 1, 1 around the outer periphery of the lamination layer body 4 and are held to the mounting flanges 6, 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated rubber for seismic isolation, and more particularly to a laminated rubber having a plurality of hard plates and rubber-like elastic plates alternately laminated, and a rubber-like rubber at least at one end in the laminating direction. A thick hard plate having a thickness greater than that of the hard plate is stacked on the elastic plate, and an outer peripheral portion of the entire laminated body including the thick hard plate is covered with a covering rubber. A seismic isolation device is used to support the base on a lower structure such as a base so that it can be displaced in the horizontal direction so as to prevent damage to the upper structure by reducing the acceleration of vibration input by an earthquake or the like. Related to laminated rubber.

[0002]

2. Description of the Related Art This kind of conventional general rubber bearing for seismic isolation is:
As shown in FIG. 12, a plurality of thin hard plates 2 such as a steel plate and rubber-like elastic plates 3 are alternately laminated between upper and lower thick hard plates 1 and 1 made of a steel plate or the like. The outer peripheral portion of the entire laminated body 4 including the thick hard plates 1 and 1 is covered with a cylindrical covering rubber 5, and these are integrally joined by vulcanization bonding of the rubber, and then the upper and lower thick hard plates 1 and 1 are joined. The mounting flanges 6, 6 for mounting to the upper and lower structures are fixed by bolting or the like.

As described above, thick hard plates 1 and 1 are arranged at both ends (which may be at least one end) in the laminating direction of the laminated body 4 so that the mounting flanges 6 and 6 are retrofitted and fixed. In the laminated rubber for seismic isolation, which is integrally bonded by vulcanization bonding of rubber, the covering rubber 5 is essentially completely blocking the laminated body 4 from the outside, so that the hard plates 1, 1 constituting the laminated body 4 And 2 prevent oxidation (generation of rust) and deterioration of the rubber-like elastic plates 3 to improve the durability of the laminated rubber. Therefore, the covering rubber 5 is made of a rubber material different from the rubber-like elastic bodies 3 and having excellent weather resistance. If the thickness t of the covering rubber 5 made of such a rubber material having excellent weather resistance is too large,
The horizontal spring stiffness of the laminated body 4 fluctuates and the seismic isolation performance of the laminated rubber tends to deteriorate, and if the thickness t of the covering rubber 5 is too thin, the original weather resistance deteriorates and the durability of the entire laminated rubber is deteriorated. Performance decreases.

Therefore, in the conventional laminated rubber for seismic isolation, the outer peripheral dimensions of the thick hard plates 1 and 1 constituting the laminate 4 and the thin hard plates 2 inside the laminate 4 (the outer diameter in the case of a cylindrical shape) (Corresponding to the dimensions) or substantially equal to each other, and a so-called cylinder-type cylindrical covering rubber 5 having a uniform or substantially uniform thickness over the entire length of the outer peripheral portion over the entire length in the laminating direction. Was adopted.

[0005]

As described above, a conventional seismic isolation laminate in which the entire outer peripheral portion of the laminate 4 including the thick hard plates 1 and 1 is covered with a cylinder-type cylindrical covering rubber 5. In the case of manufacturing rubber, a plurality of types of products (laminate rubber for seismic isolation) having different overall heights by changing only the number of laminating stages of the thin hard plate 2 having the same outer diameter and the rubber-like elastic body 3.
It is possible to mold (manufacture) using a common mold simply by selecting the use, non-use and number of height adjustment spacers, reducing the manufacturing cost of multiple types of products and the freedom in designing and manufacturing. There is an advantage that can be increased.

However, in the conventional laminated rubber for seismic isolation having the above-described structure, the outer diameters of the thick hard plates 1, 1 covered with the covering rubber 5 and the inner thin hard plates 2,... Because of the equality, when a large deformation occurs in the horizontal direction due to an earthquake or the like under a high surface pressure, as shown in FIG. 13, a shear compressive force is applied to the outer peripheral end portion of the thin hard plate 2 located near the thick hard plate 1. The bending moment acts to act, and at this time, the reaction force against the bending between the thick hard plate 1 and the covering rubber 5, which are the parts receiving the bending, is different (the covering rubber 5
Is smaller in reaction force), the outer peripheral end portion 2a of the thin hard plate 2 is easily bent and deformed at a position near the boundary between the two.

Also, due to the bending deformation of the outer peripheral end portion 2a of the thin hard plate 2, the end portion 5a of the covering rubber 5 swells in the outer peripheral direction, and this bulge and the outer peripheral end portion 2a of the thin hard plate 2
Hysteresis restoring force characteristics are deteriorated due to the bending deformation of the rubber, and as a result, not only the buckling characteristics and breaking characteristics of the laminated rubber as a whole are remarkably reduced, but also the spring constant becomes more dependent on the surface pressure, resulting in the desired exemption There was a problem that seismic performance could not be fully exhibited.

[0008] The present invention has been made in view of the above-described circumstances, and is a form in which a plurality of types of products having different heights can be manufactured at low cost using a common mold. It suppresses bending deformation of the outer peripheral end of the thin hard plate due to shear compression and bulging of the coated rubber in the outer peripheral direction, improves buckling characteristics, rupture characteristics and hysteresis restoring force characteristics. The purpose of the present invention is to provide a seismic isolation laminated rubber that can sufficiently exhibit seismic performance.

[0009]

In order to achieve the above object, a seismic isolation laminated rubber according to the first aspect of the present invention has a plurality of hard plates and rubber-like elastic plates alternately laminated. At the same time, a thick hard plate having a thickness greater than that of the hard plate is stacked on the rubber-like elastic plate on at least one end side in the laminating direction, and an outer peripheral portion of the entire laminated body including the thick hard plate is covered with rubber. In the seismic isolation laminated rubber covered with, the outer periphery of the end where the thick hard plate exists in the laminating direction of the laminate has an inner peripheral dimension substantially equal to the outer peripheral dimension of the coated rubber, And, a ring member made of a hard material that restrains and holds the end portion of the coated rubber between the thick hard plate and the hard rubber plate is arranged,
The ring body is fixed and held by a mounting flange fixed to the thick hard plate.

[0010] According to the first aspect of the present invention, the outer peripheral portion of the entire laminated body is covered via the hard material ring body fixed and held by the mounting flange which is fixed to the thick hard plate later. Since the end portion of the coated rubber is restrained and held from the outside, the rigidity inside the laminated body located close to the thick-walled hard plate due to the shear compression force when it is greatly deformed in the horizontal direction due to the occurrence of an earthquake under high surface pressure etc. The bending acting on the outer peripheral end portion of the plate is received by the ring body, and it is possible to suppress the bending deformation of the outer peripheral end portion and the swelling of the coated rubber end portion in the outer peripheral direction due to the bending deformation. Suppression and swelling of the coated rubber end portion ensure a reaction force against bending, thereby stabilizing the hysteresis restoring force characteristic and reducing the spring constant's dependency on surface pressure.

Further, an end portion of the coated rubber also exists on the outer peripheral portion of the thick hard plate which is one of the constituent members of the laminated body, and the end portion of the coated rubber is restrained from the outside by the ring body. By completely shutting off the inside and outside of the laminate,
In addition to preventing oxidation of the thick hard plate and the inner hard plate and preventing deterioration of the rubber-like elastic plate, the outer peripheral edge of the thick hard plate and the rubber-like elastic plate stacked and adhered to it at the time of large deformation The working shear stress is dispersed and relaxed at the end portion of the coated rubber, so that the rubbery elastic plate can be prevented from peeling from the thick hard plate.

By the synergistic effects of the above-described actions, the buckling characteristics, rupture characteristics, and hysteresis characteristics of the entire laminated rubber can be improved, and the seismic isolation performance against large deformation can be significantly improved. Therefore, even if an earthquake or the like occurs after a long period of time from the installation, a predetermined seismic isolation performance can be reliably exhibited.

[0013] As a means for fixing the mounting flange to the thick hard plate in the seismic isolation laminated rubber according to the first aspect of the present invention, a fixing means using bolts may be used. As described in the above, by using a fixing means by a shearing key fitted into a counterbore formed on each of the opposing surfaces, a number of bolts are used to counter the shearing force acting upon horizontal deformation. It is necessary to use a bolt, and accordingly, it is possible to simplify the structure of the fixing part and reduce the cost as compared with the fixing means using bolts, which also requires a large number of processing steps for the thick hard plate and the mounting flange. In addition, the mounting flange can be securely and strongly fixed to the thick hard plate, so that the seismic isolation performance of the laminated rubber can be reliably exhibited.

[0014] In the laminated rubber for seismic isolation according to the first or second aspect of the present invention, at least one of the plurality of hard plates of the laminated body has a thick rigidity. By forming the outer dimension of one or several hard plates located on the plate side smaller than the outer dimension of the thick hard plate, it is close to the thick hard plate when the laminated rubber is largely deformed in the horizontal direction. It is possible to further reduce the bending deformation of the outer peripheral edge portion of the hard plate located inside the laminated body.

In the laminated rubber for seismic isolation provided with the above-mentioned ring member, the ring member interferes with the end portion of the coated rubber during a large deformation, causing cracks in the coated rubber or damaging the outer peripheral surface. A new problem arises. As a means for solving this problem, in the invention according to any one of claims 1 to 3, as described in claim 4, the outer peripheral surface of the coated rubber end portion of the ring body having substantially the same thickness as the thick hard plate is provided. The inner peripheral dimension is gradually reduced as the contacting edge portion is formed in an arc shape or the inner peripheral surface of the ring body which comes into contact with the outer peripheral surface of the end portion of the covering rubber is closer to the mounting flange. Or a tapered surface as described above.
As described in the above, the thickness of the ring body is made smaller than the thickness of the thick-walled hard plate, and the edge portion in contact with the outer peripheral surface of the end portion of the coated rubber is formed in an arc shape, Means for applying a lubricant to the surface is adopted. By adopting these means, the coating rubber can expand and contract smoothly due to shear compression during large deformation, dispersing stress and strain, causing cracks in the coating rubber and scratching the outer peripheral surface And the original function of the coated rubber can be reliably maintained even after installation and use for a long period of time.

Further, in the laminated rubber for seismic isolation according to any one of claims 1 to 4 having the above-mentioned structure, as described in claim 7, the ring body is provided with a seat formed on a mounting flange. Fit into the counterbore to fix and hold, and
By adopting a configuration in which a part of the ring body on the mounting flange side is fitted into a concave portion formed on the outer peripheral surface of the thick hard plate, the shear force acting on the laminated rubber during large deformation is fitted to the ring body. It is not necessary to provide a special shearing key between the thick-walled hard plate and the mounting flange to be received by the portion, and the overall structure can be further simplified.

Further, in order to achieve the same object as described above, the laminated rubber for seismic isolation according to the invention of claim 8 has a structure in which a plurality of hard plates and rubber-like elastic plates are alternately laminated. On the rubber-like elastic plates at both ends in the laminating direction, thick thick hard plates having a thickness greater than the above-mentioned hard plate are stacked, and the outer peripheral portion of the entire laminated body including the thick hard plates is covered with the coated rubber. In the seismic isolation laminated rubber, a pair of mounting flanges for mounting to upper and lower structures are fixed to the thick hard plates at both ends in the laminating direction of the laminated body. The thick rigid plates at both ends in the stacking direction of the body are fixed via shearing keys fitted into counterbore portions formed on each of the opposing surfaces thereof, and the pair of mounting flanges are covered with the coating. Inner circumference dimension almost equal to outer circumference dimension of rubber and A ring member made of a hard material that has a thickness substantially equal to the thickness of the thick hard plate and that restrains and holds the end portion of the coated rubber between its inner peripheral surface and the outer peripheral surface of the thick hard plate is fixedly held. It is characterized by having been done.

According to the eighth aspect of the present invention, the hard material is such that the end portion of the covering rubber covering the outer peripheral portion of the entire laminate is fixedly held on the outer peripheral surface of the thick hard plate and the mounting flange. Because it is restrained and held between the inner peripheral surface of the ring body and the rigid plate inside the laminate located close to the thick hard plate due to the shear compression force when it is greatly deformed in the horizontal direction due to the occurrence of an earthquake, etc. The reaction force against bending is obtained by synthesizing the effect of suppressing the bending deformation of the outer peripheral end portion of the hard plate and the effect of suppressing the outward expansion of the coated rubber end portion by receiving the bending acting on the outer peripheral end portion with the ring body. As a result, it is possible to stabilize the history restoring force characteristic and reduce the dependency of the spring constant on the surface pressure.

In addition, the shearing force acting between the upper and lower structures and the laminated body including the thick rigid plate due to the horizontal deformation due to the occurrence of an earthquake, etc., is one of the constituent members of the laminated body. The ring body is hardly subjected to any shearing force by receiving it with the shear key used as a means for fixing the hard plate and the mounting flange to the upper and lower structures, so the ring body is deformed by the shearing force at the time of deformation. There is no danger of deformation and breakage, or the position of the laminated body fluctuating and the restraining / retaining effect of the coated rubber end part being reduced or deteriorated. Action,
That is, it is possible to reliably exert the effect of suppressing the bending deformation of the outer peripheral end portion of the hard plate and the effect of suppressing the swelling of the coated rubber end portion during the deformation in the horizontal direction.

Further, by using a shearing key as a means for fixing the mounting flange to the thick-walled hard plate, a large number of bolts are used to counter the shearing force.
The structure of the fixing portion can be simplified and the cost can be reduced as compared with a fixing means using bolts, which requires a large number of processing steps for the thick hard plate and the mounting flange.

As described above, the buckling characteristics of the laminated rubber as a whole can be made as simple as possible and at a low cost by the synergistic effect of the use of the shearing key and the action of holding and holding the coated rubber end portion by the ring body. In addition to improving the breaking characteristics and hysteresis characteristics, the seismic isolation performance against large deformation can be remarkably improved, and its durability is enhanced to ensure the required seismic isolation performance stably even after a long period of time. it can.

[0022]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the cross-sectional structure of the entire rubber bearing for seismic isolation according to the present invention.
A plurality of thin hard plates 2 such as steel plates and rubber-like elastic plates 3 are alternately laminated between circular upper and lower thick hard plates 1 and 1 made of a steel plate or the like, The outer periphery of the entire columnar laminated body 4 including the plates 1 and 1 is covered with a cylinder-type cylindrical covering rubber 5, and these are integrally joined by vulcanization bonding of the rubber. A shearing key in which mounting flanges 6, 6 for mounting the upper and lower structures A, B on the thick-walled hard plates 1, 1 are fitted into counterbore portions 1A, 6A formed on opposing surfaces of the two. 7 for fixing.

Here, a natural rubber-based rubber material or a high damping rubber material is used for the rubber-like elastic plate 3 constituting the laminate 4, and natural rubber (NR), SB
A rubber material having excellent weather resistance and chemical resistance such as R, IR, CR, and EPD is used. Further, as the hard plates 1 and 2, a hard plastic plate may be used in addition to a metal plate such as a steel plate, an iron plate, an aluminum plate, a copper plate, and a SUS plate. Furthermore, the seismic isolation laminated rubber 10 is preferably formed in a cylindrical shape so as to be able to cope with swings in all directions in the horizontal direction, but may be formed in a polygonal shape such as a square or a pentagon.

Laminate 4 in Seismic Isolation Rubber 10
Has an inner diameter d0 substantially equal to the outer diameter D of the cylindrical covering rubber 5 and has a cylindrical covering rubber 5 between the outer peripheral surface of the thick hard plate 1 and End portion 5a
A ring member 8 made of a hard material such as a steel material, which restrains and holds the ring, is arranged.
Are fixedly held through bolts 9.

In the present embodiment, as the hard material ring body 8, as shown in FIGS.
The thickness t2 is substantially equal to the thickness t1, and the edge portion 8e in contact with the outer peripheral surface 5b of the end portion 5a of the tubular covering rubber 5 is formed in an arc shape. As shown in FIG. 5, an edge portion 8 e in contact with the outer peripheral surface 5 b of the end portion 5 a of the tubular covering rubber 5 is formed in an arc shape, and the inner diameter becomes smaller as the inner peripheral surface 8 b approaches the mounting flange 6. Is formed on a tapered surface such that is gradually reduced, or as shown in FIG. 6, has a thickness t3 smaller than the thickness t1 of the thick-walled hard plate 1, and has an end of the tubular covering rubber 5. Outer peripheral surface 5b of portion 5a
The edge portion 8e in contact with the ring member 8 may be formed in an arc shape, and the inner peripheral surface 8b of the ring body 8 may be coated with a smooth material or a lubricant may be applied. Good. In any of these, the cover rubber 5 smoothly expands and contracts and disperses stress and strain in response to shear compression when the seismic isolation laminated rubber 10 undergoes large deformation in the horizontal direction. Is the end portion 5 of the covering rubber 5
This is a means for preventing cracks of the coating rubber 5 and damage to the inner peripheral surface 8b caused by interference with the inner peripheral surface 8b.

In the present embodiment, as shown in FIG. 7, all of the thin hard plates 2 are formed as a relationship between the outer diameters of the plurality of thin hard plates 2... 2
Are uniformly smaller than the outer diameter d1 of the thick-walled hard plate 1, but in addition to FIG.
As shown in (d), the outer diameter d2 of several thin hard plates 2 located close to the thick hard plate 1 is made evenly smaller than the outer diameter d1 of the thick hard plate 1, or The outer diameter of several thin hard plates 2 whose outer diameter d2 is smaller than the outer diameter d1 of the thick hard plate 1 may be varied stepwise by making a difference between them. The outer diameter of only one thin hard plate 2 located closest to the thick hard plate 1 may be reduced. These are all seismic isolation laminated rubber 10
Is a means for further reducing the bending deformation of the outer peripheral end portion 2a of the thin hard plate 2 located close to the thick hard plate 1 when large deformation occurs in the horizontal direction.

Further, among the plurality of thin hard plates 2 in the laminated body 4, one to several thin hard plates 2 located close to the thick hard plate 1 are made of, for example, S45C. By making the material of one or several thin hard plates 2 located closer to the thick hard plate 1 higher than the material of other thin hard plates, for example, by forming the SS 2 from the SS400, bending deformation resistance is improved. It is possible to further improve the performance.

The laminated rubber for seismic isolation 1 constructed as described above
At 0, a cylindrical member that covers the entire outer peripheral portion of the laminated body 4 with a hard material ring body 8 fixed and held via bolts 9 to a mounting flange 6 fixed to the thick hard plate 1 via a shear key 7 via a bolt 9 Since the end portion 5a of the covering rubber 5 is restrained and held from the outside, when the laminated rubber 10 is largely deformed in the horizontal direction from the normal state of FIG. Peripheral end portion 2 of thin hard plate 2 inside laminate 4 located close to thick hard plate 1 due to shear compression force
Since the bending acting on a is received by the ring body 8,
It is possible to suppress bending deformation of the outer peripheral end portion 2a and also suppress swelling of the end portion 5a of the coating rubber 5 in the outer circumferential direction, thereby suppressing bending deformation and swelling of the end portion 5a of the coating rubber 5. Accordingly, it is possible to secure the reaction force against bending and to stabilize the hysteresis restoring force characteristic and reduce the dependency of the spring constant on the surface pressure.

Further, since the end portion 5a of the covering rubber 5 covering the outer peripheral portion of the thick hard plate 1, which is one of the constituent members of the laminated body 4, is restrained from outside by the ring body 8, the covering rubber 5 is provided. 5 completely prevents the inside and outside of the laminated body 4 from being oxidized, thereby preventing oxidation of the thick hard plate 1 and the thin hard plates 2 inside and deterioration of the rubber-like elastic plates 3. The shear stress acting on the outer peripheral end of the thick hard plate 1 and the rubber-like elastic plate 3 stacked and adhered to the thick hard plate 1 is dispersed and alleviated by the end portion 5a of the covering rubber 5 so that the rubber-like elastic plate 3 becomes thick and hard. Peeling from the plate 1 can also be prevented.

Further, as the ring member 8 made of a hard material,
By using the structure shown in FIGS. 4 to 6, the covering rubber 5 smoothly expands and contracts against the shear compression when the seismic isolation laminated rubber 10 undergoes a large deformation in the horizontal direction. By dispersing the strain, it is also possible to prevent cracks in the coating rubber 5 and damage to the inner peripheral surface 8b caused by the ring body 8 interfering with the end portion 5a of the coating rubber 5.

By the synergistic effects of the above-described operations, the buckling characteristics, the breaking characteristics, and the hysteresis restoring force characteristics of the laminated rubber 10 as a whole can be significantly improved, and the seismic isolation performance against large deformation can be significantly improved. In addition, even if an earthquake or the like occurs after a long time has elapsed since the installation, the predetermined seismic isolation performance can be reliably exhibited even if the durability is enhanced.

FIGS. 9 and 10 are a semi-longitudinal cross-sectional structure view and an enlarged cross-sectional view of a main part of the entire rubber bearing for seismic isolation according to another embodiment of the present invention. The structure of the laminated body 4 in the laminated rubber and the thick hard plates 1, 1 which are one of the constituent members of the laminated body 4 and the upper and lower structures A, B
The use of the shearing keys 7, 7 as a means for fixing to the mounting flanges 6, 6 is the same as the seismic isolation laminated rubber according to the embodiment shown in FIGS. The detailed description of is omitted.

In another embodiment, FIG.
As shown in FIG. 3, the mounting flange 6 fixed to the thick hard plate 1 via the shearing key 7 has an inner diameter d0 substantially equal to the outer diameter D of the cylindrical covering rubber 5 and the thick hard plate 1.
Through a bolt 9 having a thickness t2 substantially equal to the thickness t1 and a ring member 8 'made of steel or hard resin having an extremely small radial width w screwed from the mounting flange 6 side. An edge portion 8e which is fixed and held and is in contact with the outer peripheral surface 5b of the end portion 5a of the tubular covering rubber 5 on the inner peripheral surface of the ring body 8 'is formed in an arc shape.

The laminated rubber for seismic isolation 1 configured as described above
At 0, similarly to the seismic isolation laminated rubber according to the above-described embodiment, the thick rigid plate 1 is formed by the shear compression force when the laminated rubber 10 is largely deformed in the horizontal direction due to the occurrence of an earthquake under a high surface pressure. The bending acting on the outer peripheral end portion 2a of the thin hard plate 2 inside the laminated body 4 located nearby is received by the ring body 8 ', thereby suppressing the bending deformation of the outer peripheral end portion 2a and the end portion 5a of the covering rubber 5. Bulging in the outer peripheral direction is also suppressed, and the bending deformation is suppressed and the end portion 5a of the covering rubber 5 is suppressed.
By suppressing the bulge, it is possible to secure the reaction force against bending and to stabilize the hysteresis restoring force characteristic and reduce the dependency of the spring constant on surface pressure. Shearing using the shearing force acting between the structures A and B and the laminated body 4 including the thick hard plates 1 and 1 as a fixing means between the thick hard plates 1 and 1 and the upper and lower mounting flanges 6 and 6 Since the ring members 8 ', 8' hardly act on the ring members 8 ', 8' when received by the keys 7, 7, the ring members 8 ', 8' are deformed and damaged by the shear force at the time of deformation. As a result, there is no possibility that the position of the covering rubber end portion 5a will be reduced or deteriorated due to position fluctuation. Therefore, while using the light and small ring bodies 8 ', 8', the original functions of suppressing the bending deformation of the outer peripheral end portion 2a of the thin hard plate 2 and the swelling of the covering rubber end portion 5a are surely exhibited. It is possible to do.

In the above-described embodiment, the hard material ring 8 merely functions to externally restrain and hold the end portion 5a of the tubular covering rubber 5 covering the outer peripheral portion of the entire laminated body 4. However, as shown in FIG. 11, the ring body 8 is fitted and fixedly held by a counterbore portion 6B formed on the mounting flange 6, and the ring body 8 is mounted on the mounting flange 6 side. A configuration may be adopted in which a part 8a of the above is fitted into a concave portion 1a formed on the outer peripheral surface of the thick hard plate 1 so that the end surfaces contact each other. In this case, the shearing force acting on the laminated rubber 10 at the time of large deformation is received by the fitting portion 8a of the ring body 8 and the shearing force between the thick hard plate 1 and the mounting flange 6 as described in the above embodiment is applied. Even if the key 7 is not specially provided, it is possible to sufficiently cope with the shearing force, and the whole structure can be further simplified.

[0036]

As described above, according to the first aspect of the present invention, a hard material having a function of externally restraining and holding an end portion of a tubular covering rubber covering the outer peripheral portion of the entire laminate is provided. By adopting a configuration in which the ring body is fixedly held on the mounting flange, the outer periphery of the entire laminated body including the thick rigid plate is covered with a so-called cylinder-type cylindrical covering rubber, and the use of a common mold makes it possible to increase the height. Bending deformation of the outer peripheral end of the hard plate inside the laminate due to shear compression during high surface pressure and large deformation and the outer peripheral direction of the coated rubber while adopting the form that multiple types of products with different sizes can be manufactured at low cost. Buckling characteristics, buckling characteristics, improvement of break characteristics and stabilization of hysteresis,
The dependency on the surface pressure can be reduced, and therefore, the desired seismic isolation performance can be reliably and sufficiently exerted even in the case of large deformation after installation and use for a long time.

According to the first aspect of the present invention, in particular, by adopting the configuration of the second or third aspect, the bending deformation of the outer peripheral end portion of the hard plate inside the laminate is reduced while simplifying the structure. Thus, the durability of the seismic isolation performance can be further improved.

Further, in the first aspect of the present invention, by adopting the constitutions of the fourth to seventh aspects, problems caused by using a hard material ring body can be solved, and large deformation can be achieved. On the other hand, a laminated rubber having high durability can be provided.

According to the eighth aspect of the present invention, the use of a shearing key and the action of holding and restraining the coated rubber end portion by the ring body synergistically make the entire structure as simple and cost-effective as possible. While improving the buckling characteristics, rupture characteristics and hysteresis force characteristics of the entire laminated rubber, it is possible to significantly improve the seismic isolation performance against large deformation,
This has the effect of increasing its durability and ensuring a predetermined seismic isolation performance stably even after a long period of time.

[Brief description of the drawings]

FIG. 1 is an overall sectional structural view of a laminated rubber for seismic isolation according to an embodiment of the present invention.

[Figure 2] Same as above, seismic isolation laminated rubber in normal state (non-deformed state)
FIG. 2 is an enlarged sectional view of a main part at the time of FIG.

FIG. 3 is an enlarged cross-sectional view of a main part in a state where the seismic isolation laminated rubber is largely deformed in the horizontal direction.

FIG. 4 is an enlarged sectional view of a main part of a ring member made of a hard material in the seismic isolation laminated rubber.

FIG. 5 is an enlarged cross-sectional view of a main part showing a modified example of the hard material ring body.

FIG. 6 is an enlarged cross-sectional view of a main part showing another modified example of the same hard material ring body.

FIG. 7 is an enlarged cross-sectional view of a main part showing an example of an outer diameter relationship between a thick hard plate and a thin hard plate in the seismic isolation laminated rubber.

8 (a), (b), (c) and (d) are main parts showing another example of the outer diameter relationship between a thick hard plate and a thin hard plate in the laminated rubber for seismic isolation of the above. It is an expanded sectional view.

FIG. 9 is a semi-longitudinal cross-sectional structural view of the entire rubber bearing for seismic isolation according to another embodiment of the present invention.

FIG. 10 is an enlarged cross-sectional view of a main part of the laminated rubber for seismic isolation.

FIG. 11 is an enlarged sectional view of a main part of a laminated rubber for seismic isolation according to another embodiment of the present invention.

FIG. 12 is an overall sectional structural view of a conventional seismic isolation laminated rubber.

FIG. 13 is an enlarged cross-sectional view of a main part in a state where the conventional seismic isolation laminated rubber is largely deformed in the horizontal direction.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 thick hard plate 2 thin hard plate inside 3 rubbery elastic plate 4 laminated body 5 tubular covering rubber 5 a end portion of covering rubber 5 b outer peripheral surface of covering rubber 6 mounting flange 7 shearing key 8, 8 'made of hard material Ring body 8b Inner peripheral surface of ring body 8e Arc-shaped edge of ring body 10 Laminated rubber for seismic isolation

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Noritaka Sasaki 1-17-18 Edobori, Nishi-ku, Osaka-shi, Osaka Inside Toyo Tire & Rubber Co., Ltd. (72) Inventor Kenji Fukui 1-1-17 Edobori, Nishi-ku, Osaka-shi, Osaka 18 Toyo Tire & Rubber Co., Ltd. (72) Hiroyuki Sakurai 1-17-18 Edobori, Nishi-ku, Osaka-shi, Osaka F-term in Toyo Tire & Rubber Co., Ltd. 3J048 AA01 AC01 BA08 BB02 DA03 EA38

Claims (9)

[Claims] 1. A plurality of hard plates and rubber-like elastic plates are alternately laminated, and a rubber-like elastic plate on at least one end side in the laminating direction has a thicker rigid plate having a thickness greater than that of the hard plate. In the seismic isolation laminated rubber in which the plates are stacked and the outer periphery of the entire laminate including the thick hard plate is covered with the covering rubber, the side where the thick hard plate exists in the lamination direction of the laminate is provided. A ring member made of a hard material that has an inner circumferential size substantially equal to the outer circumferential size of the covering rubber and that restrains and holds the end portion of the covering rubber between the thick hard plate and the outer peripheral portion is disposed on the outer periphery of the end portion. The ring body is fixedly held by a mounting flange fixed to the thick hard plate. 2. The seismic isolation device according to claim 1, wherein said fixing means for fixing said mounting flange to said thick hard plate is a fixing means using a shear key fitted into a counterbore formed on each of the opposing surfaces thereof. Laminated rubber. 3. An outer peripheral dimension of one or several hard plates located at least on the side of the thicker hard plate among the plurality of hard plates in the laminate is formed smaller than an outer peripheral dimension of the thicker hard plate. The laminated rubber for seismic isolation according to claim 1 or 2, which is formed. 4. The ring body has a thickness substantially equal to that of the thick hard plate, and has an arc-shaped edge portion in contact with an outer peripheral surface of an end portion of the covering rubber.
The laminated rubber for seismic isolation according to any of the above. 5. An inner peripheral surface of a ring body which is in contact with an outer peripheral surface of an end portion of the coated rubber is formed in a tapered surface such that an inner peripheral dimension gradually decreases as approaching a mounting flange. 4. The laminated rubber for seismic isolation according to any one of 4. 6. The ring body according to claim 1, wherein the ring body has a thickness smaller than the thickness of the thick-walled hard plate, and an edge portion in contact with an outer peripheral surface of an end portion of the coated rubber is formed in an arc shape.
The laminated rubber for seismic isolation according to 2, 3 or 5. 7. The ring body is fitted and held in a counterbore portion formed on the mounting flange, and a part of the ring body on the mounting flange side is an outer peripheral surface of the thick hard plate. The laminated rubber for seismic isolation according to any one of claims 1 to 4, which is fitted in a concave portion formed in the base member. 8. A plurality of hard plates and rubber-like elastic plates are alternately stacked, and the rubber-like elastic plates at both ends in the stacking direction are thicker hard plates having a thickness greater than that of the hard plate. Are stacked, the outer periphery of the entire laminate including the thick rigid plate is covered with a covering rubber, and the thick rigid plates at both ends in the laminating direction of the laminate have a pair of upper and lower structures for mounting to the upper and lower structures. In the seismic isolation laminated rubber in which the mounting flanges are fixed, the pair of mounting flanges and the thick hard plates at both ends in the stacking direction of the laminate are fitted into counterbore portions formed on respective opposing surfaces thereof. And the pair of mounting flanges has an inner peripheral dimension substantially equal to the outer peripheral dimension of the covering rubber and a thickness substantially equal to the thickness of the thick hard plate. Between the inner peripheral surface and the outer peripheral surface of the thick hard plate In seismic isolation laminate rubber hard material made of a ring member which restrains holding an end portion of the coating rubber is characterized in that it is fixedly held. 9. The seismic isolation laminated rubber according to claim 8, wherein an edge portion of the inner peripheral surface of the ring body that contacts an outer peripheral surface of an end portion of the covering rubber is formed in an arc shape.