JPH08267631A - Vibration releasing structural body - Google Patents

Abstract

PURPOSE: To obtain a vibration releasing structural body with extremely excellent weatherability by vulcanizing at first flexible sheets, vulcanizing then a rubber material of a coating layer and adhering rigid sheets and the flexible sheets. CONSTITUTION: This vibration releasing structural body is constituted by laminating alternately flexible sheets 2 with viscoelastic properties and rigid sheets 3 with rigidity such as steel sheets. The outer peripheral edge parts of the rigid sheets 3 and flexible sheets 2 are covered with a covering layer 4 of a rubber material with excellent weatherability. A two step type vulcanization adhering process wherein only the flexible sheets 2 are vulcanized and then, the covering rubber is vulcanized and adhered is applied. To improve weatherability of the vibration releasing structural body 1, deterioration of the internal rubber caused by oxidation, ozone and moisture is prevented from occurring by using a covering rubber with high weatherability and deterioration of adhesiveness between the rigid sheets 3 and the flexible sheets 2 being important to vibration releasing performance is prevented from occurring.

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 in which a plurality of hard plates and soft plates having viscoelastic properties are alternately laminated, and particularly to a seismic isolation structure having excellent weather resistance. It is about the body.

[0002]

2. Description of the Related Art A structure in which a hard plate such as a copper plate and a soft plate having a viscoelastic property such as rubber are laminated is widely used as a support member which is required to have vibration damping properties and vibration absorbing properties. .

The seismic isolation structure used for such a support member is inserted between the building and the base and functions to support the entire building, so that it is difficult to replace it once installed. Further, even if it is technically replaceable, the cost is considerably high. Therefore, the seismic isolation structure is required to have a durable life of 50 to 60 years, which is similar to that of a concrete structure.

By the way, since the seismic isolation structure is constantly exposed to the outside air during use, it suffers long-term deterioration due to air, humidity, ozone, ultraviolet rays, radiation for nuclear power, and sea breeze at the seaside. Further, since it supports the building, it is constantly subjected to a compressive load, and even under normal conditions, a considerable tensile stress is applied to the surface portion of the rubber layer. Moreover, when a large earthquake occurs, the rubber layer is locally
Subjected to tensile strains ranging from 0 to 200%. The deterioration further progresses due to such tensile stress and tensile strain.

From the above, it is undeniable that weather resistance such as oxidation deterioration resistance, ozone resistance, and heat aging resistance is extremely important in a seismic isolation structure which is required to have a long durable life.

The seismic isolation structures currently proposed include the following.

As shown in FIG. 2, a rubber layer 11 and a metal plate 12 are laminated, and an edge portion 12a of the metal plate 12 is exposed on the surface or covered with a thin (about 1 mm) rubber layer. As shown in FIG. 3, the rubber layer 11 and the metal plate 12 are laminated, and the edge portion 12a of the metal plate 12 has a thick surface rubber 13
Is covered with.

The rubber materials used for these seismic isolation structures are roughly classified into natural rubber type in England and New Zealand and chloroprene rubber type in France.

That is, in France, as a result of emphasizing weather resistance, chloroprene rubber is used, while in the United Kingdom,
In New Zealand, with emphasis on the fracture resistance of rubber,
Uses natural rubber. In England and New Zealand, in order to compensate for the poor weather resistance (heat aging resistance, ozone resistance, oxidation deterioration resistance, etc.) of natural rubber, a method of forming a thick surface rubber layer as shown in Fig. 3 is adopted. Has been done. (For example, in the case of a British seismic isolation structure used in a court built in the suburbs of Los Angeles, the surface rubber layer thickness is 75 mm.) Conventionally, in any of the above seismic isolation structures, All rubber parts of the seismic isolation structure are made of one compound type rubber material.

[0010]

Among the conventional seismic isolation structures, when chloroprene rubber having good weather resistance is used as the rubber material, the chloroprene rubber has poor cold resistance and is easily crystallized at low temperature. The hardness of the
As the seismic isolation structure's original seismic isolation performance cannot be demonstrated,
The use of expensive chloroprene rubber has the drawback of significantly increasing the product cost.

On the other hand, as is well known, natural rubber has poor weather resistance. In the deteriorated natural rubber, not only visible changes such as generation of ozone cracks occur, but also the elastic modulus is greatly increased, and the breaking strength and the elongation at break are largely reduced.
That is, due to long-term deterioration in the atmosphere, natural rubber has numerous ozone cracks on its surface and is transformed into a brittle material.

Therefore, even when the structure shown in FIG. 3 is used, the rubber layer on the surface is deteriorated, and if the rubber layer on the surface is covered with such a deteriorated layer, even if the internal rubber layer is not deteriorated, an earthquake occurs. When repeatedly subjected to large deformation due to, the deteriorated layer on the surface may be easily fractured, and this may trigger the fracture of the entire inner rubber layer. (For example, when a rubber B having a poor heat deterioration property is thinly applied to the surface of a rubber A having an excellent heat deterioration property and thermally deteriorated, a heat deterioration layer of the B rubber formed on the surface of the rubber A is caused. , The A rubber may be easily broken just by bending it.) Also, if moisture enters through cracks such as ozone cracks generated on the surface rubber layer of the seismic isolation structure, rust will occur on the metal of the hard plate. Moreover, there is also a risk that the metal plate and the rubber layer are separated from each other.

An object of the present invention is to solve the above conventional problems and provide a seismic isolation structure having extremely excellent weather resistance.

[0014]

The seismic isolation structure of the present invention is
The hard plate having a plurality of rigidity and the soft plate made of a rubber material having viscoelastic properties (hereinafter sometimes referred to as "internal rubber") are alternately laminated to each other to form the hard plate and the outer peripheral edge of the soft plate. A rubber material with excellent weather resistance (hereinafter referred to as "coated rubber")
There is a thing. ) A seismic isolation structure covered with a coating layer consisting of), wherein the coating layer adheres to a hard plate and a soft plate by vulcanizing the soft plate and then vulcanizing the rubber material of the cover layer. It is characterized by being.

Conventionally, it has never been done to cover the surface portion of the seismic isolation structure with a rubber material different from the rubber material forming the soft plate of the seismic isolation structure. This is because the seismic isolation structure is like a large block of rubber on the whole, and it was generally considered that there would be no problem if the surface deteriorates to some extent.

However, as mentioned above, the seismic isolation structure has
Durability over a long period of 50 to 60 years is required, if any part deteriorates, it may break and lead to breakage of the entire seismic isolation structure. Its safety is always perfect, because it is not subject to any unforeseen deformation, it cannot be neglected for some deterioration, and the seismic isolation structure supports buildings and human lives. Considering that the seismic isolation structure should be used, it is desirable that the seismic isolation structure has no risk of deterioration under the environment of its use.
Moreover, it is required for all industrial production,
Keeping product costs low is always a requirement.

Therefore, the present invention satisfies such requirements.

In the present invention, since the outer peripheral edge portions of the hard plate and the soft plate are covered with the rubber material having excellent weather resistance, the surface layer portion of the seismic isolation structure exposed to the outside air has extremely excellent weather resistance. Therefore, the hard plate and the soft plate are completely shielded from the outside air by this rubber material and protected from oxygen deterioration, ozone deterioration, and the like.

Particularly, in the present invention, after vulcanizing the soft plate,
Since the coating layer is adhered to the hard plate and the soft plate by vulcanizing the coated rubber, the vulcanization adhesion can be efficiently performed, and the coating layer can be highly adhered and integrated, and the above weather resistance improving effect is obtained. Effectively demonstrated.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a vertical sectional view of a seismic isolation structure 1 according to an embodiment of the present invention. This seismic isolation structure 1 is configured by alternately laminating soft plates 2 having viscoelastic properties and hard plates 3 having rigidity such as steel plates.

Therefore, in the present invention, the outer peripheral edge portions of the hard plate 3 and the soft plate 2 are covered with the coating layer 4 of a rubber material having excellent weather resistance.

The rubber material for the coating layer 4 is preferably a rubber-like polymer having excellent weather resistance, and examples thereof include butyl rubber, acrylic rubber, polyurethane, silicone rubber, fluororubber, polysulfide rubber, ethylene propylene rubber (EPM).
And EPDM), hypalon, chlorinated polyethylene, ethylene vinyl acetate rubber, epichlorohydrin rubber, chloroprene rubber and the like. Of these, butyl rubber, polyurethane, ethylene propylene rubber, hypalon, chlorinated polyethylene, ethylene vinyl acetate rubber, and chloroprene rubber are particularly effective from the viewpoint of weather resistance. Further, in consideration of the adhesiveness with the rubber constituting the soft plate, butyl rubber, ethylene propylene rubber, and chloroprene rubber are desirable, and particularly, ethylene propylene rubber is most preferably used.

These rubber materials may be used alone or in combination of two or more. Further, in order to improve elongation and other physical properties, commercially available rubber, for example, natural rubber,
It may be blended with isoprene rubber, styrene-butadiene rubber, butadiene rubber, nitrile rubber or the like. Further, these rubber materials may be mixed with various fillers, antioxidants, plasticizers, softeners, oils and other compounds commonly used in rubber materials.

A coating layer 4 formed of such a rubber material
Generally, the thicker the thickness, the higher the internal protection effect, which is preferable, but on the other hand, the cost becomes high, and there are problems such as delaying vulcanization. Therefore, the coating layer 4
The thickness is preferably 1 to 30 mm, desirably 2 to 20 mm, and especially 3 to 15 mm. However, when fire resistance or the like is required for the seismic isolation structure, the coating layer may have a thickness of more than 30 mm.

It is important that the coating layer 4 is firmly bonded to the hard plate 3 and the soft plate 2, and the bonding is carried out by (a) a method of simultaneously vulcanizing and bonding the internal rubber and the coated rubber. (B) A two-stage vulcanization bonding method in which only the internal rubber is vulcanized first, and then the coated rubber is vulcanized and bonded. (C) A method in which the internal rubber and the coated rubber are separately vulcanized and then bonded with an adhesive. It can be easily performed by such as

In the present invention, since the two-stage vulcanization bonding method is used in which only the soft plate is vulcanized first, and then the coated rubber is vulcanized and bonded, the following effects are exhibited and the efficiency is improved. In addition, it can be firmly bonded.

That is, as described above, the improvement of the weather resistance of the seismic isolation structure is a very important matter, and in the present invention, in order to improve the weather resistance of the seismic isolation structure, a high weather resistance coated rubber is used. Prevents deterioration of internal rubber due to oxidation, ozone, and humidity, and also prevents deterioration of adhesion between hard and soft plates, which is important for seismic isolation performance.

However, the above-mentioned effect of the coated rubber having high weather resistance is not sufficiently exerted when the coated rubber is simply "attached" to the outer peripheral surface of the laminate of the hard plate and the soft plate, and the coated rubber is not sufficiently exhibited. In order to effectively obtain the effect of improving the weather resistance, it is required that the adhesion between the coated rubber and the laminate is sufficient. Moreover, since the seismic isolation structure undergoes large deformation due to an earthquake and is used for an extremely long period of time, this adhesiveness can be maintained even when a large deformation occurs in the seismic isolation structure. It is necessary that the adhesiveness is remarkably high without being damaged even after long-term aging.

By the way, only by mechanically attaching the coated rubber to the laminated body, even if the coated rubber has excellent weather resistance, the adhesion between the laminated body and the coated rubber is not sufficient, and the laminated body is It is impossible to completely prevent the formation of a gap between the laminate and the coating layer, and the gap between the laminated body and the coating layer widens due to large deformation of the seismic isolation structure or with the passage of time. May enter, and this may deteriorate the internal rubber and the adhesiveness between the hard plate and the soft plate.

In the present invention, since the coated rubber is vulcanized and adhered, the inside of the coating layer and the laminate is substantially vacuumed and firmly bonded and integrally molded, and a gap is formed between the laminate and the coating layer. Can be completely eliminated.

According to the present invention, since the laminated body and the covering layer are bonded and integrated with each other with extremely high adhesion in this manner, even if a large deformation of the seismic isolation structure occurs, high seismic resistance is maintained for a long period of time. The laminated body can be reliably protected by the covering rubber.

In addition, in this vulcanization adhesion, the internal rubber of the soft plate is vulcanized in advance, and then the two-step vulcanization adhesion of vulcanizing the coated rubber is performed. Can be vulcanized to shorten the overall vulcanization time and enhance productivity. Optimal vulcanization conditions can be set for each of the internal rubber and the coated rubber, and good vulcanization can be performed. Such an excellent effect can be obtained.

When the adhesion between the internal rubber and the covering rubber is not good at the time of adhesion, a third rubber layer having good adhesiveness to both may be interposed therebetween. Also,
You may mix | blend the additive for adhesiveness improvement with an internal rubber and / or a coating rubber.

In the present invention, as the material of the hard plate 3, metal, ceramics, plastics, FRP, polyurethane, wood, paper plate, slate plate, decorative plate and the like can be used. As the soft plate 2, various vulcanized rubbers, unvulcanized rubbers, organic materials such as plastics,
Various materials such as these foams, inorganic materials such as asphalt and clay, and mixed materials thereof can be used.

The shapes of the hard plate and the soft plate are circular,
A polygon such as a pentagon or a hexagon may be used as well as a rectangle.

To bond such a hard plate and a soft plate, an adhesive or co-vulcanization may be used.

By the way, the seismic isolation structure undergoes large shear deformation due to the shaking of the building when an earthquake occurs. Especially in the surface layer of the soft plate on the flange mounting side of the seismic isolation structure,
Due to this shear deformation, extremely large local strain is generated, which causes damage and breakage of the seismic isolation structure.

Since this local strain is caused by bending deformation of the hard plate on the flange mounting side, in order to prevent this, in the present invention, the bending rigidity of the hard plate on the flange mounting side is set to that on the central side. Compared to higher. II Make the tensile stress of the soft plate on the flange mounting side higher than that on the center side. It is preferable to adopt at least one of the above configurations.

In the case of the configuration I, the hard plates are S ₁ , S ₂ , S ₃ ... S _M (S _M is a hard plate at the center) from the flange mounting side, and each is bent at 25 ° C. If the rigidity is E _S1 , E _S2 , E _S3 ... E _SM , the hard plate S ₁
The flexural rigidity E _{S1 of} is set to the following value with respect to the flexural rigidity E _SM of the hard plate S _M.

[0041]

[Equation 1]

Further flexural rigidity E _S2 of the hard plate S ₂ are hard plate S
To flexural rigidity E _SM of _M, to be a value as follows.

[0043]

[Equation 2]

Further, the flexural rigidity E _S3 of the hard plate S ₃ may be higher than the flexural rigidity E _SM of the hard plate S _M if necessary.

In this case, the hard plates S ₁ , S ₂ , S ₃ ... S
_B bending rigidity of _M E _S1 , E _S2 , E _S3 …… E _SM is E _S1 ≧ E _S2 ≧
E _S3 ≧ …… ≧ E _SM (however, E _S1 = E _S2 = E _S3 = …… =
Except for E _SM . ), Or at random so that E _S1 , E _S3 and E _S7 (bending rigidity of the _seventh hard plate S ₇ from the flange side) are larger than E _SM. good. In the present invention, it is only necessary that the bending rigidity on the flange side is higher than the bending rigidity of the hard plate on the center side, and the bending rigidity of each hard plate is estimated to be added to the seismic isolation structure. Is appropriately set depending on the direction and degree of

There is no particular limitation on the method for making the bending rigidity of the hard plate on the flange side higher than that on the center side, but the plate thickness is increased by using a hard plate of the same material as the center side. A suitable method is to use a hard plate that is different from the side and is made of a material having higher bending rigidity. For, generally the thickness of the same material of the plate is a bending stiffness 2 ^triple doubles, plate thickness having a flexural rigidity in need is readily determined by calculation.

[0047] If the II configuration, the soft plate from the flange attachment side _{R 1, R 2, R 3} ...... R M (R M soft plate in the center) and 100% in each of the 25 ° C. elongation The tensile stress (Modulus 100) at the time of E _R1 ,
_Letting E _R2 , E _R3 ... E _RM , the tensile stress E _R1 of the soft plate R ₁ has the following value with respect to the stress E _RM of the soft plate R _M.

[0048]

(Equation 3)

[0049] The tensile stress E _R2 soft plate R ₂ is the value as follows with respect to the tensile stress E _RM soft plate R _M.

[0050]

[Equation 4]

Further, the tensile stress E _R3 of the soft plate R ₃ may be set higher than the tensile stress E _RM of the soft plate R _M if necessary.

In this case, the soft plates R ₁ , R ₂ , R ₃ ... R
_M tensile stress E _R1 , E _R2 , E _R3 …… E _RM is E _R1 ≧ E _R2
≧ E _R3 ≧ …… ≧ E _RM (however, E _R1 = E _R2 = E _R3 = ……
Except when = E _RM . ), Or E _R1 , E _R3 , and E _R7 (tensile stress of the _seventh soft plate R ₇ from the flange side) may be set to be larger than E _RM .

There is no particular limitation as to the method for making the tensile stress of the soft plate on the flange side higher than that on the center side, but a base material of the same quality as the center side is used to increase the compounding amount of the filler, etc. A suitable method is to use a soft plate that is different from the side and is made of a material having a high tensile stress.

In the present invention, the central soft plate R _M
Tensile stress E _RM of 100% elongation at 25 ℃ is 5-40
It is preferably set to kg / cm ² .

By adopting the configuration of I and / or II,
This is extremely advantageous because local strain caused by bending deformation of the hard plate near the flange is prevented from occurring, and damage and breakage of the seismic isolation structure due to local strain are reduced.

The seismic isolation structure of the present invention as described above has characteristics such as vibration isolation (vibration prevention and damping) in addition to the seismic isolation function.

Hereinafter, the present invention will be described in more detail with reference to experimental examples.

Experimental Example 1 NR compound rubber sheet (thickness 2 mm) and thickness 4 m
The NR-based compounded rubber sheets coated with m of EPDM rubber on both sides were heated in an air oven at 100 ° C. for 10 days, the physical properties thereof were measured, and the degree of thermal deterioration was examined. The results are shown in Table 1. For comparison, the physical properties of an NR-based compounded rubber sheet that was not heat-treated were also measured, and are also shown in Table 1.

[0059]

[Table 1]

Experimental Example 2 NR rubber and EPDM rubber-coated NR rubber similar to those used in Experimental Example 1 were respectively subjected to 50% elongation at 40 ° C. and 100 ° C.
The sample was left to stand in ozone of pphm and the time until crack initiation was determined.

As a result, the NR rubber cracked within 1 hour, while the EPDM rubber-covered NR rubber had 4 cracks.
No cracks occurred even after 00 hours had passed.

From the results of Experimental Example 1 and Experimental Example 2, it is apparent that the deterioration of the internal rubber can be almost completely prevented by coating the ordinary rubber with the rubber having excellent weather resistance.

[0063]

As described in detail above, in the seismic isolation structure of the present invention, the inner rubber is made of the coating rubber, and air, humidity,
Since it is completely shielded from the external environment such as ozone, ultraviolet rays, radiation and sea breeze, it is not deteriorated by these. Further, since the hard plate such as metal is not affected by the external environment, the problems of rust generation and separation between the hard plate and the soft plate can be solved.

Since the seismic isolation structure of the present invention is extremely excellent in weather resistance, its durability can be greatly improved and it can be used for a long period of time in any environment.

[Brief description of drawings]

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

FIG. 2 is a sectional view showing a conventional example.

FIG. 3 is a cross-sectional view showing a conventional example.

[Explanation of symbols]

 1 Seismic isolation structure 2 Soft plate 3 Hard plate 4 Coating layer

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location B32B 25/04 B32B 25/04 E04B 1/36 7121-2E E04B 1/36 B E04H 9/02 331 E04H 9/02 331A F16F 1/36 F16F 1/36 B // B29K 105: 24

Claims (1)

[Claims] 1. A coating layer composed of a plurality of rigid hard plates and a soft plate having viscoelastic properties, which are alternately laminated, and the outer peripheral edge portions of the hard plates and the soft plate made of a rubber material having excellent weather resistance. The seismic isolation structure covered by 1., wherein the covering layer is adhered to the hard plate and the soft plate by vulcanizing the soft plate and then vulcanizing the rubber material of the covering layer. A characteristic seismic isolation structure.