JPH1082206A - Aseismic base isolation structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve aseismic characteristics by providing non-adhesive sheet- like materials between hard plates having rigidity forming an aseismic base isolation and soft plates having a viscoelastic property. SOLUTION: Hard plates 12 and soft plates 14 are alternatively laminated between an upper flange 18 and a lower flange 20 and circularly cut poly-4- fluoro ethylene 16 made sheets 16 previously exist on both the faces of the center part of the hard plate 14 whose diameter is smaller than that of the soft plate before curing and adhering are performed. A part providing the sheet 16 is formed as a non-adhesive part after curing and adhering processing is performed, and the area is suitable for about 10-80% of the area of the laminated hard plate 12. Thereby because damping characteristics are improved by friction of the hard plate 12 of a non-adhesive part and the non-adhesive sheet 16, excellent aseismic base isolation characteristics can be obtained for even a lightweight building such as a detached house.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation structure used for a seismic isolation device and the like. It is about a seismic structure.

[0002]

2. Description of the Related Art Conventionally, a seismic isolation structure in which a plurality of rigid plates having rigidity such as a plurality of steel plates and soft plates such as rubber having viscoelastic properties are alternately laminated has been used for seismic isolation of buildings and bridges. Widely used as a device. Such a seismic isolation structure generally uses an elastic body such as a rubber material as a soft plate and a metal plate as a hard plate. An elastic body such as rubber constituting a soft plate of such a seismic isolation structure is generally designed to have the following spring characteristics. That is, the natural frequency fH in the horizontal direction is represented by the following equation, where K is the spring stiffness of an elastic body such as rubber and M is the mounting load.

[0003]

(Equation 1)

Since the natural frequency fH is determined by the ratio of the weight M of a building or a bridge to the spring rigidity K of an elastic body such as rubber, the soft vibration of a seismic isolation device having a large mounting load M such as a building or a bridge. In general, a material having high spring stiffness or a high elastic material is used as the elastic body constituting the plate. When this is applied to a detached house or the like having a light load, a detached house or the like has a small mounting weight M, and therefore requires a low elasticity material having a small spring rigidity K as a material of the soft plate.

The relationship between the spring rigidity K and the shear rigidity G is as follows.
When the pressure receiving area of the soft plate is A and the thickness is L, it is expressed by the following equation.

[0006]

(Equation 2)

Therefore, in order to lower the spring rigidity K,
Methods of (1) reducing the shear rigidity G of the rubber itself, (2) reducing the area of the hard plate located between the soft plates, and (3) increasing the thickness L of the soft plate are conceivable.

However, the shear rigidity G of the rubber itself is
For example, reducing the pressure to 1 kgf / cm ² or less (γ = 100%) is a problem in consideration of creep properties, and may be affected by wind sway. Also,
If the pressure receiving area A is made small and the thickness L is made large, the shape becomes unstable, and buckling is likely to occur when subjected to shearing force. For this reason, Japanese Patent Application Laid-Open Nos.
No. 90942 discloses that a through hole is provided inside a seismic isolation structure for the purpose of reducing the horizontal spring stiffness without changing the elastic material. If a through hole is provided inside the seismic isolation structure, the spring stiffness will decrease, but the shape ratio, which is the ratio of the cross-sectional area to the side area, will decrease, and creep will increase. In this case, there is a problem that the buckling deformation is apt to occur and the vertical spring stiffness is reduced.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional technique, and reduces the creep property, buckling deformation resistance, and vertical spring rigidity of a conventional seismic isolation structure. An object of the present invention is to provide a seismic isolation structure that exhibits excellent seismic isolation characteristics even when applied to light-weight objects such as wooden buildings and detached houses, in which only the horizontal spring stiffness is reduced without causing the horizontal spring stiffness. It is.

[0010]

The seismic isolation structure of the present invention comprises:
A plurality of hard plates having rigidity and soft plates having viscoelastic properties, each being a seismic isolation structure laminated alternately,
Between the hard plate having the rigidity and the soft plate having the viscoelastic property, a non-adhesion portion formed by interposing a sheet-like material having no adhesiveness between the hard plate and the soft plate is used. It is characterized by being adhered to have. Here, it is preferable that the entire outer peripheral portion of the non-adhered portion is adhered.

In the seismic isolation structure of the present invention, the non-adhesive sheet-like material is selected from the group consisting of a polymer film, a metal film, and a metal-coated polymer film. The film is poly-
4-Fluoroethylene, polyester, polyamide, polyethylene, being made of one or more polymer compounds selected from the group consisting of polyvinyl chloride, and the thickness of the polymer film is preferably 10 to 200 μm. .

In another aspect of the seismic isolation structure of the present invention, the non-adhesive portion is formed by providing a through hole in the soft plate. Also in this aspect, it is preferable that the entire outer peripheral portion of the non-adhered portion is adhered.

[0013] The area of the non-adhered portion is 10 to 80% of the area of the hard plate.

In the seismic isolation structure of the present invention, the hard plate and the soft plate are bonded so as to have a non-bonded portion formed by interposing a non-adhesive sheet or providing a through-hole in the soft plate. Therefore, the horizontal spring stiffness can be reduced without using a material having a low shear stiffness as a material for the soft plate and without reducing the buckling resistance of the hard plate. Further, in the mode in which the non-adhesive sheet is interposed, since the damping property can be improved by friction between the hard plate and the non-adhesive sheet of the non-adhesive portion, it is excellent even when applied to a lightweight object such as a detached house. It can exhibit seismic isolation characteristics.

Further, the non-adhesive portion can be easily formed by interposing a non-adhesive sheet between the soft plate and the hard plate or flange, or by providing a through hole in the soft plate. Therefore, there is also an advantage that seismic isolation structures having various horizontal spring stiffnesses can be easily manufactured by general-purpose manufacturing equipment.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The seismic isolation structure of the present invention will be described in detail.

FIG. 1A is a schematic sectional view showing one embodiment of the seismic isolation structure 10 of the present invention. This seismic isolation structure 10
Is formed by alternately laminating a rigid hard plate 12 and a soft plate 14 having viscoelastic properties, and an adhesive is provided between the rigid hard plate 12 and the soft plate 14 having viscoelastic properties. A sheet 16 made of poly-4-fluoroethylene, which is a sheet having no properties, is disposed. Hard plate 1
Flanges 18 and 20 are arranged above and below a laminated body of 2 and the soft plate 14, respectively.

In the seismic isolation structure 10 shown in FIG. 1, a disc-shaped hard plate 1 is provided between an upper flange 18 and a lower flange 20.
2 and the soft plate 14 are alternately laminated and vulcanized before bonding. On both sides of the central portion of the soft plate 14, a circularly cut poly-4-fluorinated ethylene having a diameter smaller than the diameter of the soft plate. Sheet 16 made of a metal. FIG. 1B is a front view showing a state in which a sheet 16 made of poly-4-fluoroethylene is arranged at the center of the soft plate 14. The portion where the sheet 16 is interposed forms a non-adhered portion even after the vulcanization bonding process.

FIG. 5 is a schematic sectional view of another embodiment of the seismic isolation structure of the present invention. In the seismic isolation structure 50 shown in FIG. 5, a non-adhered portion is formed by providing a through hole 54 at the center of the soft plate 52. This seismic isolation structure 5
No. 0 is formed by alternately laminating a rigid hard plate 12 having rigidity and a soft plate 52 having viscoelastic properties provided with a through hole 54 in the center, and the rigid hard plate 12 having no rigidity has no through hole. It has a disk-like shape. Hard plate 12 and soft plate 5
The flanges 18 and 20 are provided above and below the laminate with
Are arranged, and the hard plate 12 and the soft plate 52 and the soft plate 52 and the upper and lower flanges 18 and 20 are bonded with an adhesive. FIG. 5B is a perspective view showing a soft plate 52 provided with a through hole 54.

The material having a viscoelastic property constituting the soft plate used for the seismic isolation structure of the present invention is a material having a 50% modulus of 1 to 10 kgf / cm ² and a dynamic shear modulus G at 25 ° C. of 1 Refers to those having characteristics of 10 to 10 kgf / cm ² , and the 50% modulus is preferably 1.5 to 5 k
gf / cm ² , more preferably 1.5 to 3 kgf / c
m ² , and the dynamic shear modulus G at 25 ° C. is preferably 1.5 to 5 kgf / cm ² , more preferably 1.5 to 3 kgf / cm ² . The 50% modulus and the dynamic shear modulus G of various materials are, for example, JIS K
6301 and K6394.

Here, as the material having the viscoelastic property, specifically, organic materials such as thermoplastic rubber, urethane rubber, various kinds of vulcanized rubber, finely crosslinked rubber, elastomer, plastics, and the like, Various materials such as inorganic materials such as body, asphalt, clay and the like, and mixed materials thereof, having the above viscoelastic properties can be used.

As the hard plate constituting the seismic isolation structure, various materials having required rigidity such as metal, ceramics, plastics, FRP, polyurethane, wood, paper plate, slate plate, decorative plate, etc. may be used. Can be. Here, the required rigidity varies greatly depending on the design conditions,
It means rigidity that does not easily cause buckling when subjected to shear deformation. Generally, from the viewpoint of strength and durability, steel plate, iron plate,
A metal plate such as an aluminum plate is widely used.

The thickness and shape of the hard plate are not particularly limited.
The seismic isolation structure can be selected according to the purpose for which it is used, and the thickness thereof is generally about 0.5 to 5 mm. The shape is arbitrary as in the case of the soft plate to be laminated, but usually, the same shape as the soft plate to be used in combination is used.

The soft plate and the hard plate are alternately laminated in a plurality of stages and bonded by a known means such as vulcanization bonding or bonding to each other with an adhesive to form a seismic isolation structure. This bonding means is not particularly limited, but when a non-bonded portion is formed with a sheet-like material having no adhesive property, vulcanization bonding can be performed as it is, but when bonding with an adhesive, Preferably, the adhesive is applied to either the hard plate or the soft plate.

In order to form the non-adhesive portion, the non-adhesive sheet-like material interposed between the soft plate and the hard plate includes a polymer film, a metal film, and a polymer film coated with metal. And the like, and as the polymer film, a poly-film known under the trade name of Teflon.
4-fluoroethylene film, polyester film,
A polyamide film, a polyethylene film, a polyvinyl chloride film and the like can be suitably used. The polymer compound constituting the film may be used alone or in combination of two or more.

The thickness of the polymer film is 10 to 2
When the thickness is less than 10 μm, it is very difficult to handle. When the thickness is more than 200 μm, when manufacturing the seismic isolation structure, the height of the portion where the non-adhesive sheet exists and its surroundings Since the difference between the non-adhesive sheet and the portion where the non-adhesive sheet does not exist becomes large and the adhesiveness between the soft plate and the hard plate varies, none of them is preferable.

Examples of the metal film include aluminum, stainless steel, and the like.
It is preferably 200 μm.

As the polymer film coated with a metal, the polymer film is spin-coated with a metal,
Those coated by a known method such as sputtering or vapor deposition can be used. The thickness of the metal coating is preferably 0.01 to 1 μm.

As for the position where the sheet-like material having no adhesive property is interposed, the entire periphery is adhered, that is, the non-adhered portion is formed inside the soft plate not in contact with the outer periphery, and the creep property Preferred from a viewpoint.

When a through hole is formed in a soft plate to form a non-adhesive portion as shown in FIG. 5A, the through hole is formed at a central portion as shown in FIG. 5B. It may be provided at one place, or may be provided at a plurality of places as shown in FIG. FIG. 5C is a perspective view showing an embodiment of a soft plate having a plurality of through holes. The position where the through hole is provided can be optimally selected in consideration of the horizontal spring rigidity and the overall load balance. Also, the size and position of the through holes provided in the soft plate used for one seismic isolation structure do not necessarily have to be the same, and may be appropriately selected and configured according to the required seismic isolation performance of the seismic isolation structure. it can. The soft plate having the through holes can be obtained by a known molding method such as punching and injection molding.

In order to form the non-adhesive portion, a sheet-like material having no adhesiveness may be interposed between the soft plate and the hard plate, or a through-hole may be provided in the soft plate.
The area of the non-adhesive part is 10 to 10 of the area of the hard plate to be laminated.
It is preferably 80%, more preferably 30 to 70%, and even more preferably 40 to 60%. When a plurality of non-adhesive portions are provided, the area of the non-adhesive portion is determined as a total of those areas. When the area of the non-adhered portion is less than 10% of the area of the hard plate, the effect of lowering the rigidity is insufficient, and
If the ratio exceeds buckling performance, the buckling performance is undesirably low.

In the seismic isolation structure of the present invention, the outside of the seismic isolation structure may be coated with a material having excellent weather resistance in order to improve durability and weather resistance. As this coating material, for example,
Butyl rubber, acrylic rubber, polyurethane, silicone rubber, fluorine rubber, polysulfide rubber, ethylene propylene rubber (ERP and EPDM), chlorosulfonated polyethylene, chlorinated polyethylene, ethylene vinyl acetate rubber, chloroprene rubber, and the like can be used. These materials may be used alone or as a blend of two or more. Further, it may be blended with natural rubber, isoprene rubber, styrene butadiene rubber, butadiene rubber, nitrile rubber and the like. When applying this coating material, it is preferable to apply a method that does not impair the productivity improved by the production method of the present invention, for example, applying a thermosetting polyurethane to the outer periphery of the seismic isolation structure, Method of curing, method of placing seismic isolation structure with completed bonding process in mold, method of casting coating material, method of wrapping and heating thermoplastic elastomer, injection molding method, post-adhesion of vulcanized rubber And the like.

[0033]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.

[Embodiment 1] In the seismic isolation structure 10 shown in FIG.
In between, 20 steel plates having an outer diameter of 160 mm and a thickness of 1 mm as the hard plate 12, and a 50% modulus as the soft plate 14,
2.4kgf / cm ^2, the tensile strength is 84kgf / c
m ² , a rubber material having a breaking elongation of 740% (thickness of one sheet: 1.
6 mm) were used. The soft plate 14 and the hard plate 12
When vulcanizing and bonding, a Teflon (trademark) sheet 1 having a diameter of 110 mm and a thickness of 50 μm
6 was interposed. FIG. 1B is a perspective view showing the soft plate 14 on which the Teflon sheet 16 is arranged. It was confirmed that the portion where the Teflon sheet 16 was interposed remained a non-adhered portion even after the vulcanization bonding treatment. The area of the non-adhesive part is
This was 47% of the area of the hard plate 12.

Comparative Example 1 As Comparative Example 1, the hard plate 12
A seismic isolation structure was manufactured in the same manner as in Example 1 except that the Teflon sheet 16 was not interposed between the soft plate 14 and the soft plate 14.

Comparative Example 2 As Comparative Example 2, the hard plate 12
A seismic isolation structure was manufactured in the same manner as in Example 1, except that the bonding treatment was not performed on the both sides of the central portion of the sample having a diameter of 110 mm.

Comparative Example 3 The soft plate 14 had a 50% modulus of 7 kgf / cm ² and a tensile strength of 200 kgf.
A seismic isolation structure was manufactured in the same manner as in Comparative Example 1, except that a high-hardness rubber material having an elongation / cm ² and a breaking elongation of 450% was used.

Comparative Example 4 The soft plate 14 had a 50% modulus of 7 kgf / cm ² and a tensile strength of 200 kgf.
A seismic isolation structure was manufactured in the same manner as in Comparative Example 2, except that a high-hardness rubber material having an elongation / cm ² and a breaking elongation of 450% was used.

(Evaluation of Performance of Seismic Isolation Structure) The obtained seismic isolation structures of Example 1 and Comparative Example 1 were subjected to a vertical load of 3 tons, and were subjected to a condition of 200% shear strain at a frequency f = 0.2 Hz. Was measured for horizontal spring stiffness Kh (kgf / cm) and tan δ. In addition, the shape ratio, which is the ratio between the cross-sectional area and the side area, of the soft plate used in the seismic isolation structure was calculated. The results are shown in Table 1 below.

[0040]

[Table 1]

As is clear from Table 1, according to the seismic isolation structure of the first embodiment, the spring rigidity can be reduced to 70% without changing the shape ratio of the soft plate, and the damping property is greatly reduced. Could be improved. That is, since the shape ratio was not changed, it was possible to achieve low elasticity and high damping of the seismic isolation structure without deteriorating the creep performance. As is clear from comparison between Comparative Examples 1 and 2 and Comparative Examples 3 and 4 using materials having different rigidities, a non-adhesive sheet is interposed between a hard plate and a soft plate, although a non-adhesive portion is provided. When not performed (Comparative Examples 2 and 4), the reduction in the spring stiffness based on Comparative Examples 1 and 3 having no non-adhesive portion was 5 to 8
%, The effect is small, and it can be seen that the improvement in the damping property is slight.

Embodiment 2 FIG. 2A is a sectional view of a base-isolated structure 22 according to Embodiment 2 of the present invention.

The seismic isolation structure 22 shown in FIG. 2A is a steel plate 2 having an outer diameter of 160 mm, an inner diameter of 30 mm, and a thickness of 1 mm as a hard plate 24 between the upper flange 18 and the lower flange 20.
0 sheets, soft plate 26 with 50% modulus of 2.4 kg
Rubber material (thickness: 1.6 mm) having a f / cm ² , a tensile strength of 84 kgf / cm ² , and a breaking elongation of 740% has an outer diameter of 160 m.
m, punched to an inner diameter of 30 mm, thickness of 50 μm on both sides,
It is configured by alternately stacking 21 soft plates 26 each having two 127-inch Teflon sheets 28 each having an outer diameter of 127 mm and an inner diameter of 62 mm.

FIG. 2B is a perspective view showing the soft plate 26 on which the Teflon sheet 28 is disposed. Teflon sheet 28
It was confirmed that the intervening portion constituted a non-adhered portion. The area of the non-bonded portion is 50 times the area of the hard plate 24.
%Met.

Comparative Example 5 As Comparative Example 5, the same procedure as in Example 2 was repeated except that the entire surface of the hard plate 24 was adhered to the soft plate 26 without interposing the Teflon sheet 28 therebetween. A seismic structure was fabricated.

Under the same conditions as in Example 1, the horizontal spring stiffness Kh (kgf / cm) and tan δ at a shear strain of 200% were measured, and the cross-sectional area and side area of the soft plate used in this seismic isolation structure were measured. The shape ratio, which is the ratio, was calculated. Table 2 shows the results.

[0047]

[Table 2]

As is clear from Table 2, according to the seismic isolation structure of the second embodiment, the spring stiffness is reduced to 67% in comparison with Comparative Example 5 without changing the shape ratio of the soft plate. And the damping property was greatly improved. That is, since the shape ratio was not changed, low elasticity and high damping could be achieved without deteriorating creep properties.

Third Embodiment FIG. 3 is a schematic sectional view of a base-isolated structure 30 according to a third embodiment.

The seismic isolation structure 30 shown in FIG. 3 has, as a hard plate 24, 20 steel plates having an outer diameter of 160 mm, an inner diameter of 30 mm, and a thickness of 1 mm between the upper flange 18 and the lower flange 20.
The soft plate 26 has a 50% modulus of 2.4 kgf / c.
m ² , tensile strength 84 kgf / cm ² , elongation at break 740
% Of a rubber material having a thickness of 1.6 mm, an outer diameter of 160 mm, and an inner diameter of 30 mm.
It is configured by alternately laminating 21 soft plates 26 each having two 7-mm Teflon sheets 32 each having an inner diameter of 62 mm stuck together.

It was confirmed that the intervening portion of the Teflon sheet 32 constituted a non-adhesive portion. The area of the non-bonded portion was 50% of the area of the hard plate 24.

A nylon plate having a thickness of 1.5 mm and an outer diameter of 29.6 mm is provided as a friction plate 34 in a central through hole.
A steel plate having a thickness of 5 mm and an outer diameter of 29.6 mm was placed as a pressing plate 36 thereon, and sealed under pressure with a screw 38 of H30 at a torque of 100 kgf · cm.

The obtained seismic isolation structure 34 was subjected to horizontal spring stiffness (kgf
/ Cm) and tan δ were measured. The results are shown in Table 3 below.

Fourth Embodiment FIG. 4A is a sectional view of a base isolation structure 40 according to a fourth embodiment of the present invention.

The seismic isolation structure 40 shown in FIG. 4A has, between the upper flange 18 and the lower flange 20, 20 steel plates having an outer diameter of 160 mm and a thickness of 1 mm as the hard plate 12, and 50% as the soft plate 14. A rubber material having a modulus of 2.4 kgf / cm ² , a tensile strength of 84 kgf / cm ² , and a breaking elongation of 740% and exhibiting vulcanization characteristics was punched into a 1.6 mm thick, 160 mm outer diameter, and FIG. As shown in the figure, one Teflon sheet 42 (thickness: 50 μm) having a diameter of 60 mm is provided at the center.
Around the Teflon sheet 44 having a diameter of 35 mm (thickness 50
μm) It is configured by alternately stacking 21 soft plates 14 each of which is arranged and stuck.

FIG. 4B is a perspective view showing the soft plate 14 to which the Teflon sheets 42 and 44 are adhered. It was confirmed that the intervening portions of the Teflon sheets 42 and 44 constituted non-adhesive portions. The total area of the non-adhered portions was 52% of the area of the hard plate 12.

For this seismic isolation structure 42, the horizontal spring stiffness and tan δ at a shear strain of 200% were measured under the same conditions as in Example 1. Table 3 shows the results.

[0058]

[Table 3]

As is clear from Table 3, in the seismic isolation structure 30 of the third embodiment, the horizontal spring stiffness can be reduced to 72% and the damping can be reduced as compared with the comparative example 1 having no non-adhered portion. The performance was greatly improved. Furthermore, by forming a laminate of friction plates by laminating a nylon plate in the center hole, creep properties were further improved, and low elasticity and ultra-high damping could be achieved.

Also in the seismic isolation structure 40 of the fourth embodiment, the horizontal spring stiffness can be reduced to 63% and the damping property can be greatly improved. Considering the results of the fourth embodiment and the first embodiment together, it is clear whether the non-adhered portion is divided into nine parts as in the fourth embodiment and provided at a plurality of locations or one location as in the first embodiment. It was also found that in the case of, the spring stiffness could be reduced and the damping property could be improved.

Fifth Embodiment FIG. 5A is a schematic sectional view of a base isolation structure 50 according to a fifth embodiment of the present invention.

The seismic isolation structure 50 shown in FIG. 5A has a structure in which between the upper flange 18 and the lower flange 20, 20 steel plates having an outer diameter of 160 mm and a thickness of 1 mm as the hard plate 12 and 50% as the soft plate 52. A 1.6 mm thick vulcanized rubber sheet having a modulus of 2.4 kgf / cm ² , a tensile strength of 84 kgf / cm ² and an elongation at break of 740% and a vulcanized rubber sheet having a thickness of 1.6 mm has an outer diameter of 160 m.
m, a donut-shaped vulcanized rubber sheet having an inner diameter of 110 mm
One sheet is punched out, stacked alternately, and adhered to each other with an adhesive. FIG. 5B is a perspective view showing the soft plate 52 having the through hole 54 at the center. No skin rubber was applied. The area of the non-bonded portion obtained from the diameter of the through hole 54 is 47% of the area of the hard plate 12.
Met.

Comparative Example 6 As Comparative Example 6, the hard plate 12
A steel plate 2 having an outer diameter of 160 mm, an inner diameter of 110 mm and a thickness of 1 mm
A seismic isolation structure was manufactured in the same manner as in Example 5, except that the zero sheet was used and the same shape as the soft plate 52 was used. No skin rubber was applied.

With respect to Example 5 and Comparative Example 6, Example 1
Horizontal spring stiffness at 200% shear strain (k
gf / cm ² ) and tan δ were measured. In Comparative Example 6, buckling deformation occurred at a shear strain of 180%, and measurement was impossible. Table 4 shows the measurement results of Example 5.

[0065]

[Table 4]

As is clear from these results, buckling deformation is apt to occur when a large through-hole is formed in the center of the seismic isolation structure as in Comparative Example 6 to reduce the elasticity. By providing a through hole as a doughnut-shaped soft plate only and providing a non-adhesive portion between the soft plate and the hard plate without providing an opening, it is possible to achieve low elasticity without lowering buckling characteristics. It showed an excellent effect.

[0067]

As is evident from the above description, the seismic isolation structure of the present invention can be used horizontally without lowering the creep, buckling resistance and vertical spring stiffness of the conventional seismic isolation structure. It has the advantage of exhibiting excellent seismic isolation characteristics even when applied to light-weight objects such as wooden buildings and detached houses with only reduced spring stiffness.

[Brief description of the drawings]

FIG. 1A is a schematic cross-sectional view illustrating a seismic isolation structure of Example 1, and FIG. 1B is a perspective view illustrating a soft plate on which a Teflon sheet used in the seismic isolation structure is disposed.

FIG. 2A is a schematic sectional view showing a seismic isolation structure of Example 2, and FIG. 2B is a perspective view showing a soft plate to which a Teflon sheet used in the seismic isolation structure is attached.

FIG. 3 is a schematic cross-sectional view illustrating a seismic isolation structure according to a third embodiment.

FIG. 4A is a schematic cross-sectional view illustrating a seismic isolation structure of Example 4, and FIG. 4B is a perspective view illustrating a soft plate to which a Teflon sheet used in the seismic isolation structure is attached.

FIG. 5A is a schematic sectional view showing a seismic isolation structure of Example 5, and FIG. 5B is a perspective view showing a soft plate provided with a through hole used in the seismic isolation structure; (C) is a perspective view which shows another aspect of the soft board provided with the through-hole.

[Explanation of symbols]

 10: Seismic isolation structure 12: Hard plate 14: Soft plate 16: Non-adhesive sheet-like material (Teflon sheet) 22: Seismic isolation structure 24: Hard plate 26: Soft plate 28: Non-adhesive sheet Sheet (Teflon sheet) 30: Seismic isolation structure 32: Non-adhesive sheet (Teflon sheet) 34: Friction plate (nylon plate) 40: Seismic isolation structure 42: Non-adhesive sheet (Teflon sheet) 50: Seismic isolation structure 52: Soft plate 54: Through hole (through hole formed in soft plate)

Claims (7)

[Claims] A seismic isolation structure in which a plurality of rigid plates having rigidity and a plurality of soft plates having viscoelastic properties are alternately laminated, wherein the rigid plate having rigidity and viscoelastic properties are provided. The soft plate is bonded so as to have a non-adhesive portion formed by interposing a sheet-like material having no adhesiveness between the hard plate and the soft plate. Seismic isolation structure. 2. The seismic isolation structure according to claim 1, wherein the non-adhesive sheet is selected from the group consisting of a polymer film, a metal film, and a metal-coated polymer film. body. 3. The polymer film according to claim 1, wherein the polymer film is made of at least one polymer compound selected from the group consisting of poly-4-fluoroethylene, polyester, polyamide, polyethylene, and polyvinyl chloride. Item 4. The seismic isolation structure according to Item 2. 4. The polymer film has a thickness of 10 to 2
The seismic isolation structure according to claim 2 or 3, wherein the thickness is 00 µm. 5. A seismic isolation structure in which a plurality of rigid plates having rigidity and a plurality of soft plates having viscoelastic properties are alternately laminated, wherein the rigid plate having rigidity and viscoelastic properties are provided. A seismic isolation structure characterized by being bonded to a soft plate so as to have a non-bonded portion formed by providing a through hole in the soft plate. 6. The seismic isolation structure according to claim 1, wherein an outer peripheral portion of the non-adhered portion is entirely adhered. 7. The seismic isolation structure according to claim 1, wherein an area of the non-adhesive portion is 10% to 80% of an area of the hard plate.