JP2002081499A - Laminated rubber body for seismic isolation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and surely close a hole for positioning a hard plate to reduce the dependency of horizontal rigidity on surface pressure, and to be broken or broken even if it is repeatedly deformed due to an earthquake or the like. Therefore, it is possible to stably maintain the performance that the dependency on the surface pressure is small over a long period of time. SOLUTION: A through hole 5 for positioning a hard plate, which penetrates in the laminating direction, is provided at a center portion of a laminate 3 formed by alternately stacking and vulcanizing and bonding a plurality of hard plates 1 and rubber-like elastic plates 2. An elastic material 6 such as a reactive two-pack type polyurethane elastomer is densely sealed in the through hole 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to the lower part of various buildings such as buildings and bridges, and absorbs vibration energy input due to the occurrence of earthquakes and traffic vibrations to reduce the acceleration of vibration. The present invention relates to a seismic isolation laminated rubber body that is used to prevent a building from being damaged by reducing it.

[0002]

2. Description of the Related Art In this kind of laminated rubber body for seismic isolation,
The applied load varies depending on the size and weight of the building subject to seismic isolation or the installation position of the laminated rubber body itself. If the behavior of the laminated rubber body changes when vibration is input due to the occurrence of an earthquake, etc. due to the fluctuation of the applied load, the amount of displacement (the amount of shaking) of the building changes, causing excessive stress and strain. ,
Local stress concentrations can cause damage to buildings.

As shown in FIG. 2, a general seismic isolation laminated rubber body is formed by alternately laminating a plurality of hard plates 21 such as thin steel plates and rubber-like elastic plates 22 and vulcanizing and bonding them. At both ends in the stacking direction of the body 23, mounting flanges 24A and 24B for a building-side portion such as a pillar and a ground-side portion such as a foundation are integrally arranged and fixed.

At the center of the plurality of hard plates 21 and the rubber-like elastic plates 22 constituting the laminate 23, holes 25 are formed so as to penetrate them in the laminating direction. The through hole 25 is formed between the hard plate 21 and the unvulcanized rubber-like elastic plate 22.
When vulcanizing and bonding by heating and pressing in a state of laminating with an adhesive interposed between them, heating is also performed from the center part in order to ensure uniformity of vulcanization, and a plurality of sheets at the time of vulcanization bonding This is necessary for positioning each hard plate 22 by inserting and holding a bar material such as a metal bar in order to align the hard plate 22. Conventionally, in a general laminated rubber body for seismic isolation,
After completion of the vulcanization bonding, a rod material such as a metal rod inserted into the through hole 25 for alignment and positioning of the hard plate 22 was pulled out and removed, and the central through hole 25 was kept open. .

[0005]

Generally, when a horizontal displacement force is applied to a seismic isolation laminated rubber body due to the occurrence of an earthquake or the like, a displacement characteristic of a complicated hysteresis curve as shown in FIG. 3 is exhibited. At this time, even if the applied load fluctuates, the shape of the hysteresis curve does not change, that is, the horizontal stiffness does not depend on the surface pressure or is small, to prevent the damage of the building due to local stress concentration. Highly requested above.

By the way, the through hole 25 at the center of the laminate 23
In a conventional general seismic isolation laminated rubber body in which is open (in a penetrated state), a plurality of rubber-like elastic plates 22 constituting the laminate 23 protrude into the through holes 25 when deformed. Therefore, the horizontal rigidity is more dependent on the surface pressure than that without a through-hole, and especially after experiencing large deformation under high surface pressure, the horizontal rigidity of the laminated rubber It is inevitable that the structure itself will be damaged or change the behavior of the laminated rubber body.As a result, sufficient seismic isolation function to prevent damage to the building where the laminated rubber body for seismic isolation is installed. Can not be achieved.

Therefore, according to the present invention, when the through-hole formed for aligning and positioning the hard plate at the time of vulcanization is closed, the horizontal rigidity is less dependent on the surface pressure than when the through-hole is left open. Starting from becoming a starting point, various studies have been conducted on measures to close the hole, and the hole is made of a material with excellent followability that does not break or break even after repeated deformation due to the occurrence of an earthquake or the like. It is an object of the present invention to provide a laminated rubber body for seismic isolation which has succeeded in stably maintaining the performance of low surface pressure dependency over a long period of time by closing the space.

[0008]

In order to achieve the above object, a laminated rubber body for seismic isolation according to the present invention is obtained by alternately laminating a plurality of hard plates and rubber-like elastic plates and vulcanizing and bonding them. A seismic isolation laminated rubber body in which mounting flanges are arranged and fixed at both ends in the laminating direction of the laminated body, wherein the plurality of hard plates and the rubber-like elastic plates penetrate through predetermined positions in the laminating direction. An elastic material is densely sealed in a through hole for positioning a hard plate at the time of vulcanization bonding, which is formed in a state where the adhesive is vulcanized.

According to the present invention, when a plurality of hard plates and a rubber-like elastic plate which are alternately stacked are vulcanized and bonded, the hard plates are formed in the stacking direction for alignment and positioning of the hard plates. By using an elastic material as a filling material (filling material) for the through-hole, a hard plate or rubber constituting the laminated body is required as compared with a case where a hard solid columnar material such as an epoxy resin is inserted into the through-hole as a filling material. The diameter of the elastic plate is reduced by elasticity so that the insertion resistance due to the sliding contact resistance with the edge of the elastic plate is reduced to facilitate insertion into the through hole. After insertion, the hole is securely sealed without any gap by elastic restoration. Thus, it is possible to reliably prevent the rubber-like elastic plate from protruding during deformation, and to reduce the dependency of the horizontal rigidity on the surface pressure. In addition, since the enclosure is a flexible elastic material, the enclosure does not break or break when deformed due to the occurrence of an earthquake, etc. As a result, it is possible to stably maintain the performance that the dependency on the surface pressure is small over a long period of time. The rigidity can be restored.

As the elastic material in the laminated rubber body for seismic isolation according to the present invention having the above-mentioned structure, the liquid material injected into the through-hole and cured by the reaction in the through-hole is as described in claim 2. Either an elastic elastomer or a rubber or resin product which is processed into a flexible rod shape and inserted into the through-hole as described in claim 3 may be used. When using, the encapsulation workability of the elastic material is very easy, and the elastic elastomer is cured early by the reaction in the through-hole, and is bonded and integrated with the rubber-like elastic plate of the laminated body. Completely closes without gaps to enhance the effect of preventing the rubber-like elastic plate from protruding during deformation, and at the time of deformation due to the occurrence of an earthquake, etc. after enclosing, it acts very integrally with the laminate and does not break or break very much Flexible following deformation Thereby it is possible not only it is possible to reduce the initial horizontal rigidity can be reliably held over the performance of the surface pressure dependency is small long.

As the liquid elastic elastomer, a reactive silicone elastomer may be used. In particular, as described in claim 4, the use of a reactive two-pack type polyurethane elastomer is preferable. In other words, when a reactive two-pack type polyurethane elastomer is used, it can be cured at room temperature simply by mixing and stirring the two liquids and injecting it into the through-hole, but the volume of the laminate itself is large and the heat capacity is large. Since the polyurethane elastomer is large and hard to cool down, the polyurethane elastomer is quickly cured by the residual heat, and the reaction is completed within a short time. Therefore, the workability of enclosing the elastic material in the through hole is very excellent.

The composition of the reactive two-pack type polyurethane elastomer is obtained by reacting a diisocyanate such as tolylene diisocyanate (TDI) or diphenylmethane diisocyanate with a hydroxyl-terminated polyol (P). In addition to a urethane polymer having an isocyanate group at one end (one liquid), a polyamine such as 4,4 methylenebis-2-chloroaniline (MBOCA) as a crosslinking agent, polypropylene glycol, and the like, heavy calcium carbonate, clay, and talc , Fillers such as carbon, plasticizers such as DOP and DOA,
It is preferable to use a mixture of (a two-part) obtained by blending a stabilizer such as BHT.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a sectional structure of a laminated rubber body for seismic isolation according to the present invention. This laminated rubber body for seismic isolation A is composed of a plurality of circular hard plates 1 such as a thin steel plate and a circular rubber-like elastic plate 2.
The mounting flanges 4A and 4B for the building-side portion such as a pillar and the ground-side portion such as a foundation are integrally disposed and fixed at both ends in the stacking direction of the laminate 3 formed by alternately stacking and vulcanizing and bonding. ing.

A plurality of hard plates 1 constituting the laminate 3
At the center of the rubber-like elastic plate 2, a hole 5 penetrating in the laminating direction is formed. This through hole 5
When the hard plate 1 and the unvulcanized rubber-like elastic plate 2 are laminated with an adhesive interposed therebetween by applying heat and pressure to perform vulcanization bonding, from the central portion to achieve uniform vulcanization. For heating, and positioning of each hard plate 2 by inserting a rod material such as a metal bar in order to align the plurality of hard plates 2 at the time of vulcanization. After that, after a bar material such as a metal bar is drawn out and removed, a rod-shaped elastic material 6 is densely sealed in the through hole 5.

The laminated rubber body A for seismic isolation constructed as described above is interposed between the upper structure of the building and the lower structure such as the foundation via the mounting flanges 4A and 4B and seismically isolated. Used to perform a function. In such a seismic isolation usage mode, a large load is applied to the laminated body 3 even in normal times, and in this state, the laminated rubber body A due to the occurrence of an earthquake or the like.
When a displacement force in the horizontal direction is applied to the sheet, a plurality of hard plates 1 and rubber-like elastic plates 2 constituting the laminate 3 are horizontally displaced by a high surface pressure due to a large load, and a hysteresis curve as shown in FIG. And will exhibit the specified seismic isolation performance.

Here, since the rod-shaped elastic material 6 is densely sealed and closed in the through hole 5 formed at the center of the laminate 3, a plurality of sheets constituting the laminate 3 at the time of deformation are formed. The rubber-like elastic plate 2 is prevented from protruding into the through-hole 5, and the behavior of each rubber-like elastic plate 2 is restrained, so that the dependency of the horizontal rigidity on the surface pressure can be reduced.

The through hole 5 is made of an elastic material 6 having flexibility.
Since the elastic material 6 itself is not broken or destroyed at the time of deformation due to the occurrence of an earthquake or the like,
The elastic material 6 itself also smoothly deforms following the deformation. As a result, the surface pressure dependency is small, the performance can be stably maintained over a long period of time, and the horizontal rigidity of the laminated rubber body A is almost reduced even after undergoing a large deformation under a high surface pressure. Without damping, the specified damping performance and the resilience of horizontal rigidity are secured over a long period of time, and even after a long period of installation, the function of preventing damage to the building on which the seismic isolation laminated rubber body A is installed is fully exhibited. Can be done.

Hereinafter, elastic materials 6 of different materials are provided in the through holes 5.
The present invention will be described more specifically with reference to Examples and Comparative Examples in which is enclosed (inserted). In each of the examples and comparative examples, 26 rubbery elastic plates made of natural rubber having a diameter of 500 mm and a thickness of 3.75 mm and 25 hard plates made of a steel plate having a thickness of 3.2 mm were alternately laminated and added. A laminated rubber body formed by sulfur bonding and having a 20 mm diameter through hole formed in the center thereof is used.

Example 1: A two-component reaction type polyurethane elastomer was injected into a central through-hole and reacted and cured to encapsulate an elastic material. The composition of the polyurethane elastomer used here is as follows. One-part TDI-80 (manufactured by Takeda Pharmaceutical) 25 parts P-1000 (manufactured by Adeka Argus) 30 parts MN-3050 (manufactured by Mitsui Chemicals) 45 parts Two-part EP-240 (manufactured by Mitsui Chemicals) 20 parts Curemin ( MBOCA: Ihara Chemical Co., Ltd.) 18 parts Antege (BHT: Kawaguchi Chemical Co., Ltd.) 1 part Heavy calcium carbonate (Maruo Calcium Co., Ltd.) 43 parts DOP (Daichika Chemical Co., Ltd.) 18 parts Immediately after mixing, the mixture is poured into the through-hole of the laminated rubber body left standing and cooled to room temperature, and left to stand for 7 days to cure.

The urethane elastomer prepared by flowing the mixture having the above composition on a pallet and allowing it to stand for 7 days to cure is described in JIS K6251 and K6235.
As a result, it was found that the hardness A was 76, the tensile strength was 6.4 MPa, and the elongation at break was 350%.

Example 2: A material in which a reactive silicone elastomer is injected into a central through hole, cured, and an elastic material 6 is sealed. Example 3: A vulcanized rubber processed into a rod shape is inserted into a through hole at the center. Example 4: One in which a nylon resin processed into a rod shape is inserted into a central through hole.

COMPARATIVE EXAMPLE 1 A center through hole was left open (through state). Comparative Example 2: Column-shaped lead sealed in a central through-hole. Comparative Example 3: Clay was sealed in the central through-hole. Comparative Example 4: A rod-shaped epoxy resin inserted into a central through hole.

Regarding the initial rigidity, surface pressure dependency, and resilience of the laminated rubber bodies shown in Examples 1 to 4 and Comparative Examples 1 to 4, ○ (high evaluation), Δ (medium evaluation), × (low evaluation) ), The results shown in Table 1 were obtained.

[0024]

[Table 1]

As is clear from Table 1, Examples 1-4
The seismic isolation laminated rubber body according to the present invention shown in the above, not only has a small initial horizontal rigidity change, but also smoothly deforms without deformation or breakage even with deformation accompanying the occurrence of an earthquake or the like. The through hole is kept in a filled state without gaps, and the performance of low surface pressure dependency is stably maintained over a long period of time, and even after undergoing large deformation, the predetermined damping performance and the resilience of horizontal rigidity are maintained. It was confirmed that it was possible to secure enough.

On the other hand, the laminated rubber body of Comparative Example 1 has a very large surface pressure dependency as described above. The laminated rubber body of Comparative Example 2 has a low initial surface rigidity with the through-holes opened because the hardness of the central part in which lead is encapsulated is locally increased although the dependency on the surface pressure in the initial stage of deformation is reduced. Not only does not provide the required performance, but also the lead plug is apt to be broken early inside the hole due to repeated deformation, and retains the performance that surface pressure dependence is small during subsequent deformation. Can not do.

The laminated rubber body of Comparative Example 3 has a small hardness at the center and the initial horizontal rigidity is almost the same as that of the rubber body without holes (not sealed). There is no effect of preventing the rubber-like elastic plate from protruding during deformation, or the effect is very small, so there is no significant difference in the surface pressure dependency from the one with the hole still open, and the resilience of horizontal rigidity Can not expect too. Furthermore, the laminated rubber body of Comparative Example 4 was hindered from being inserted due to the sliding contact resistance between the edge of the hard plate or rubber-like elastic plate facing the inner peripheral surface of the through hole and the outer peripheral surface of the hard solid column. It is very difficult to insert in tight contact, and if the outer diameter of the hard solid column is smaller than the inner diameter of the through-hole in order to reduce the sliding contact resistance and facilitate insertion, the insertion operation itself becomes easier. However, after insertion, since a gap is generated between the inner peripheral surface of the hole and the outer peripheral surface of the hard solid columnar material, not only can not reliably prevent the rubber-like elastic plate from protruding during deformation, Since the hard solid columnar material is destroyed at the initial stage of deformation, it is almost impossible to reduce the surface pressure dependency and to maintain the performance with a small surface pressure dependency over a long period of time.

In the above embodiments and examples, the plurality of hard plates 1 and the rubber-like elastic plates 2 constituting the laminate 3 are described.
In the above description, the positioning through-holes 5 are formed at the center position of the through-holes in such a manner as to penetrate in the laminating direction. May be. However, in this case,
Needless to say, it is necessary to enclose the elastic material 6 in all of the plurality of through holes.

[0029]

As described above, according to the present invention,
By using an elastic material as a filling material (filling material) in the through-hole formed in the laminated body for alignment positioning of a plurality of hard plates at the time of vulcanization bonding, the encapsulation work is facilitated, The inside of the through-hole is tightly sealed so as not to form a gap, so that the rubber-like elastic plate is reliably prevented from protruding during deformation, and the dependency of horizontal rigidity on surface pressure can be reduced. In addition, since the enclosure is an elastic material having flexibility, it does not break or break when deformed due to the occurrence of an earthquake or the like, and smoothly deforms following the deformation to maintain the filling state in the hole. Therefore, it is possible to stably maintain the performance that the contact pressure dependency is small over a long period of time, and to achieve a predetermined damping performance and horizontal rigidity even after experiencing high contact pressure and large deformation. There is an effect that resilience can be secured.

Further, by using a liquid elastic elastomer as the elastic material, particularly a reactive two-component type polyurethane elastomer as described in claim 4, two kinds of liquid elastomers can be obtained. By simply mixing and injecting the mixture into the through hole, the polyurethane elastomer can be reacted and cured in a short time by using the residual heat of the laminate itself having a large volume and a large heat capacity. The workability of enclosing the elastic material in the through-hole is made very excellent, and the productivity of the laminated rubber body for seismic isolation having small surface pressure dependence can be improved.

[Brief description of the drawings]

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

FIG. 2 is an overall sectional structural view of a conventional laminated rubber body for seismic isolation.

FIG. 3 is a horizontal displacement-horizontal load history curve of the seismic isolation laminated rubber body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hard board 2 Rubbery elastic board 3 Laminated body 4A, 4B Mounting flange 5 Through hole 6 Elastic material A Laminated rubber body for seismic isolation

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) F16F 1/40 F16F 1/40 Z 15/08 15/08 D

Claims (4)

[Claims] 1. A seismic isolation laminated rubber in which a plurality of hard plates and rubber-like elastic plates are alternately laminated and vulcanized and bonded, and mounting flanges are arranged and fixed at both ends in the laminating direction of a laminated body. An elastic material in a through hole for positioning the hard plate at the time of vulcanization bonding, which is formed at a predetermined position of the plurality of hard plates and the rubber-like elastic plate so as to penetrate them in the laminating direction. Laminated rubber body for seismic isolation characterized by being enclosed in 2. The elastic material is injected into a through hole,
The seismic isolation laminated rubber body according to claim 1, which is a liquid elastic elastomer that is cured by a reaction in the hole. 3. The seismic isolation laminated rubber body according to claim 1, wherein the elastic material is a rubber or resin product which is processed into a rod-like shape having flexibility and is inserted into the through hole. 4. The laminated rubber body for seismic isolation according to claim 2, wherein the liquid elastic elastomer is a reactive two-pack type polyurethane elastomer.