JPH09272174A - Base isolation laminated rubber and its preparation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To relax stress concn. to a rubber end part and to obtain a large horizontal deformation capacity by bonding a prevulcanized sheet-like rubber and a metal sheet and specifying shearing strain in the horizontal direction. SOLUTION: Each layer of a vulcanized rubber sheet 2' is bonded under a condition where the vulcanized rubber sheets are smashed one layer by one layer and they are spread in the facial direction by applying a pressure during adhesion. When this pressure is released, the sheet-like rubber tends to return to the original size but as the bonded face is restricted, a shearing stress remains in the interface between the metal sheet 1 and the rubber sheet 2'. However, under the actual service condition, as a vertical load is applied again, it becomes close to the condition during manufacturing and the shearing stress remaining in the bonding interface becomes small. The shearing stress in the horizontal direction is made at least 400%.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a base-isolated laminated rubber and a method for producing the same.

[0002]

2. Description of the Related Art Seismic isolation laminated rubber is installed between a building and a foundation to reduce the transmission of earthquake shaking to the building.
By attenuating the vibration of the building quickly, the damage of the building, the people inside, and the goods is reduced. The seismic isolation laminated rubber is formed by alternately laminating a rubber-like elastic body and a metal plate in several layers to several tens layers. Generally, the manufacturing method is as follows. 1. Vulcanize the rubber layer by stacking a required number of metal plates and unvulcanized rubber sheets that have been appropriately treated by applying a primer / vulcanizing adhesive, and applying appropriate pressure and temperature. And a metal plate are simultaneously adhered to obtain a laminated rubber. 2. A predetermined number of metal plates that have been treated in the same manner as in 1 above are properly installed in a mold, and fluid rubber is injected into the mold, so-called injection molding method to mold the rubber layer and bond the metal plates. To obtain a laminated rubber.

In any of such seismic isolation laminated rubbers, in both cases, the rubber layer is vulcanized and adhered to the metal plate at the same time. Therefore, since the bonding is performed in the flow state of the rubber, a mold having a complicated structure is required to obtain a predetermined thickness of the rubber layer, the initial cost becomes large, and the manufacturing is complicated.

The seismic isolated laminated rubber has a structure as shown in FIG. 4 (a), for example. By stacking the metal plate 1 and the rubber layer 2 in multiple layers as shown in FIG. 4A, it is possible to make the rubber hard in the vertical direction while maintaining the softness peculiar to rubber in the horizontal direction. In seismically isolated laminated rubber, the spring constant in the vertical direction may reach several thousand times the spring constant in the horizontal direction. This makes it possible to support a large weight such as that of a building, and to lengthen the natural period in the horizontal direction.

In such a seismically isolated laminated rubber, when it is installed under a building, that is, when a vertical load is applied, the end of the rubber sticks out as shown in FIG. Shear stress is applied to the adhesive interface. This shear stress becomes higher toward the end of the rubber as shown in FIG. 4 (c). When it is deformed in the horizontal direction, the sum of the shear stress due to the vertical load and the shear stress due to the horizontal displacement acts, and the stress at the end of the rubber becomes the maximum, and there is a case where the fracture easily starts from this point.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, in which stress concentration on the rubber end is alleviated, and a larger horizontal deformation capacity is obtained, which results in long-term An object of the present invention is to provide a base-isolated laminated rubber that can avoid cracks due to deterioration, and further to provide a method for producing the base-isolated laminated rubber that has a simple manufacturing process and low cost and is excellent in thickness accuracy.

[0007]

Means for Solving the Problems As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that an unvulcanized rubber solution containing a vulcanizing agent in a pre-vulcanized sheet rubber is used. It was found that the above object can be achieved by coating, applying a vulcanizing adhesive to a metal plate, alternately laminating a predetermined number of sheets and pressurizing at a specific pressure, and completed the present invention. .

The seismic isolation laminated rubber of the present invention is a laminated rubber obtained by alternately laminating rubber layers and metal plates, and a pre-vulcanized sheet rubber (hereinafter sometimes referred to as vulcanized rubber sheet). It is characterized by being bonded to a metal plate and having a horizontal shear breaking strain of 400% or more.

The method for producing a base-isolated laminated rubber of the present invention is a rubber sheet obtained by applying an unvulcanized rubber solution containing a vulcanizing agent to a sheet rubber (vulcanized rubber sheet) which has been vulcanized in advance and drying it. Layers and a metal plate formed by applying a vulcanizing adhesive are alternately laminated in a tubular guide in 1 to 50 layers at a temperature of 100 to 170 ° C.
The method is characterized in that pressure is applied in the stacking direction to adhere. Preferably, the pressure at the time of applying pressure and adhering in the laminating direction is 20 to 20 times the load pressure when the seismic isolation laminated rubber is actually used.
100%.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The base-isolated laminated rubber of the present invention is formed by alternately laminating pre-vulcanized sheet rubber (vulcanized rubber sheet) and a metal plate and adhering them to each other. Is 400% or more.

The seismic isolation laminated rubber of the present invention comprises a rubber sheet layer obtained by applying a non-vulcanized rubber solution containing a vulcanizing agent to a sheet rubber (vulcanized rubber sheet) which has been vulcanized in advance and drying it. Alternately laminating 1 to 50 layers with a metal plate coated with a vulcanizing adhesive, and placing it on a tubular guide at a temperature of 100 to 170 ° C.
In, it is manufactured by pressing and adhering in the stacking direction.

The vulcanized rubber sheet used in the base-isolated laminated rubber and the method for producing the same of the present invention is made of natural rubber, chloroprene rubber, ethylene propylene rubber or the like having excellent elastic function as a base rubber material for mechanical strength and tensile strength. It is a vulcanized rubber sheet or rubber plate with excellent strength.

The unvulcanized rubber solution containing the vulcanizing agent used in the base-isolated laminated rubber of the present invention and the method for producing the same is applied to the vulcanized rubber sheet and dried to leave the surface of the vulcanized rubber sheet uncoated. The vulcanized rubber coating layer is formed. Specifically, it is a solution prepared by dissolving a mixture of the above-mentioned base rubber material or unvulcanized rubber with a vulcanizing agent in an organic solvent such as benzene, toluene or xylene. A solution of a rubber compound in an unvulcanized state in which a vulcanizing agent is mixed with the same base rubber as the vulcanized rubber sheet is preferred, and compatibility with the vulcanized rubber sheet is preferred. The thickness of the unvulcanized rubber solution containing this vulcanizing agent after coating and drying (that is, the thickness of the unvulcanized rubber coating layer) is 0.0.
It is preferably 1 mm or more and 0.1 mm or less. At the time of adhesion, the unvulcanized rubber coating layer flows to have a uniform thickness, and an appropriate pressing pressure is applied to the entire surface, whereby good adhesion can be obtained. However, the thickness of this unvulcanized rubber coating layer is 0.1
If the thickness exceeds mm, the thickness accuracy of the rubber sheet layer of the laminated rubber is deteriorated, and if the thickness of the unvulcanized rubber coating layer is less than 0.01 mm, the thickness of the unvulcanized rubber coating layer is not uniform, which is not preferable.

The vulcanizing adhesive used in the method for producing the base-isolated laminated rubber of the present invention is a halogenated polymer or cyclized rubber to which a cross-linking agent is added. For example, it is commercially available from Chemlok and Sixon. What has been used is used. When applying this vulcanizing adhesive to a metal plate, it is preferable to apply a primer to the metal plate in advance, especially when using a rubber layer of low polarity such as natural rubber. Are used, for example, those commercially available from ChemRock and Sixon are used.

The tubular guide used in the method for producing the seismic isolated laminated rubber of the present invention is a rubber sheet layer composed of a vulcanized rubber sheet, an unvulcanized rubber coating layer, etc., when the metal sheet is misaligned during lamination, and It serves to prevent the protrusion. The number of laminated rubber sheet layers and metal plates in the seismic isolated laminated rubber and the manufacturing method thereof according to the present invention is 1 to 50 layers, preferably 10 to 35 layers.

In the method for producing the base-isolated laminated rubber of the present invention,
According to a preferred method, the pressure at the time of adhering by pressing in the laminating direction is 20 to 1 of the load pressure when the seismic isolation laminated rubber is actually used.
It is 00%. This will be described with reference to FIG. FIG.
As shown in (a), by applying a pressure at the time of bonding, the vulcanized rubber sheet 1 layer 1 layer is crushed and bonded in a state of being spread in the surface direction. When this pressure is released,
The sheet-shaped rubber tries to return to its original size, but since the adhesive surface is constrained, it becomes as shown in FIG.
Shear stress remains at the rubber interface. However, in the actual use state, the vertical load is applied again as shown in FIG. 1 (c), which is close to the state of FIG. 1 (a) at the time of manufacturing, and the shear stress remaining at the metal / rubber adhesive interface becomes small. If the surface pressure at the time of adhesion is too low, the above-mentioned effect becomes small, and if it exceeds 100% of the actual use, tensile stress remains inside the rubber even in the actual use state. Further, it is not preferable to apply a high surface pressure at the time of bonding, because it requires a large manufacturing apparatus. The outer diameter of the rubber before bonding is
The outer diameter of the metal plate is preferably 1 to 20% smaller than the outer diameter of the metal plate in consideration of the spread of the rubber when the adhesive pressure is applied.

[0017]

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

Example 1 A natural rubber and a vulcanizing agent obtained by dissolving a natural rubber and a vulcanizing agent in toluene were applied to both surfaces of a vulcanized rubber sheet 2'having an outer diameter of 150 mm and a thickness of 2 mm, which was vulcanized mainly with natural rubber. A vulcanized rubber solution was applied and dried to prepare a rubber sheet layer 5 having an unvulcanized rubber coating layer 4 having a thickness after drying of 0.05 mm. On the other hand, a primer (phenolic type) and a vulcanization adhesive (manufactured by SICKSON) 6 were applied to both surfaces of a galvanized steel sheet 1 having an outer diameter of 160 mm and a thickness of 0.8 mm. [See FIG. 2 (b)] The adhesive-coated steel sheet and the rubber sheet layer are alternately laminated to form 20 layers, and the metal plates 3 for attachment are arranged above and below.
2 was placed and held in the cylindrical guide 7 as shown in FIG. 2 (a), and a pressure of 3 tons was applied at 150 ° C. to bond them, to manufacture a model body of the base-isolated laminated rubber. A vertical load of 10 tons was applied to the obtained seismic isolated laminated rubber model body,
0 → 40 → 0 mm in the horizontal direction, speed: 10 mm / sec
Was applied and the shear recovery characteristics were evaluated. The result is shown in Figure 3.
Good shear recovery characteristics were obtained as shown in. Also,
Under the same conditions, the model body was horizontally displaced until it fractured, the displacement was read, and the fractured sample was observed. The shear fracture strain was 410%, and the fracture did not occur at the metal / rubber interface, but occurred at the rubber sheet layer portion.

Example 2 A model body of a base-isolated laminated rubber was manufactured in the same manner as in Example 1 except that the pressure for adhesion was 5 tons. A rupture test was performed in the same manner as in Example 1 to apply a vertical load of 10 tons to the model body of the base-isolated laminated rubber and to check the displacement in the horizontal direction until the model body ruptures. Table 1 shows the results.

Comparative Example 1 A model body of a base-isolated laminated rubber was manufactured in the same manner as in Example 2 except that the pressure for adhesion was 1 ton. The results of the breaking test are shown in Table 1.

Comparative Example 2 A model body of a seismic isolated laminated rubber was manufactured in the same manner as in Example 2 except that the pressure for adhesion was 15 tons. The results of the breaking test are shown in Table 1.

[0022]

[Table 1] As can be seen from Table 1, the shear breaking strain of the seismic isolated laminated rubber of the present invention (Example) is higher than that of Comparative Example.

[0023]

According to the method of manufacturing the base-isolated laminated rubber of the present invention, the vulcanized rubber plate is coated with the unvulcanized rubber solution containing the vulcanizing agent, and the metal plate is coated with the vulcanizing adhesive. The number of sheets is alternately laminated and the pressure is applied, the manufacturing process is simple, and a mold having a complicated structure as in the past is not required, so that the initial cost can be reduced. Furthermore, by setting the surface pressure during bonding to 20% or more and 100% or less of the actual use, thickness accuracy is good, stress concentration on the rubber end is relieved, and a larger horizontal deformation capacity is obtained, which results from long-term deterioration. We were able to provide a seismic isolated laminated rubber that can avoid cracks.

[Brief description of drawings]

1] FIG. 1 is a view of the seismic isolation laminated rubber of the present invention when (a) is bonded and (b)
It is a figure which shows the state of adhesive pressure release and (c) actual use.

FIG. 2 (a) A method for producing a base-isolated laminated rubber of the present invention and (b)
It is an enlarged view of a portion showing a laminated state of a vulcanized rubber sheet and a metal plate.

FIG. 3 is a diagram showing shear recovery characteristics of the base-isolated laminated rubber of the present invention.

FIG. 4 is a diagram showing a state of shear (shear) stress at a metal / rubber bonding interface when a conventional seismic isolation laminated rubber is subjected to a vertical load.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 metal plate 2 rubber layer 2'vulcanized rubber sheet 3 metal plate for attachment 4 unvulcanized rubber coating layer 5 rubber sheet layer 6 vulcanized adhesive 7 tubular guide

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Masui 9-1 Futaba-cho, Numazu-shi, Shizuoka Prefecture Fujikura Numazu Factory

Claims (3)

[Claims] 1. A laminated rubber obtained by alternately laminating rubber layers and metal plates, wherein a pre-vulcanized sheet-shaped rubber and a metal plate are adhered to each other, and a horizontal shear breaking strain is 40.
A seismically isolated laminated rubber characterized by being 0% or more. 2. A rubber sheet layer obtained by applying an unvulcanized rubber solution containing a vulcanizing agent to a sheet rubber that has been vulcanized in advance and drying, and a metal plate obtained by applying a vulcanizing adhesive. 1 to 50 layers are alternately laminated in the tubular guide, and the temperature is 100 to 170.
A method for producing a base-isolated laminated rubber, which comprises pressurizing and adhering in a laminating direction at ℃. 3. The pressure applied when adhering by pressing in the laminating direction is 20 to 1 of the load pressure when the seismic isolation laminated rubber is actually used.
It is 00%, The manufacturing method of the base-isolated laminated rubber of Claim 2.