JPH0768801B2 - Surrounding seismic isolation device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation device of a perimeter restraint type that mounts and supports a structure to reduce seismic input and to perform vibration isolation.
By surrounding the outer circumference of the columnar rubber-like body with a constraining material in a laminated arrangement, a perimeter restraint type that gives a large rigidity that can support the structure in the vertical direction while maintaining a large deformation capacity in the horizontal direction Seismic isolation device.

2. Description of the Related Art Laminated rubber bearings have been widely used as seismic isolation devices for structures such as buildings, and they are roughly classified into three types.

The first type is a laminated rubber bearing (a) in which rubber plates (1) and steel plates (2) such as natural rubber having a small compression set are alternately laminated and fixed as shown in FIGS. ). Since this type has an extremely large ratio of vertical compression rigidity to horizontal shear rigidity, it reduces the transmission of seismic energy to the structure while stably supporting a heavy structure against earthquake motion.

The second type has the effect of absorbing vibration energy in the laminated structure of the laminated rubber bearing of the first type, and therefore, as shown in FIGS. 27 (a) and 27 (b), a lead plug ( 3) It is a lead-laminated rubber bearing (B) which is installed through [3] [Japanese Patent Publication No. 61-17984]. This type is
As shown in Fig. 28, by virtue of the hysteresis damping due to the plastic strain of lead enclosed inside, the vibration amplitude of the structure caused by the earthquake is reduced and it is damped quickly.

The third type is a laminated rubber bearing (a) shown in FIGS. 26 (a) and 26 (b), in which a high damping rubber is used for the rubber body (1) so that the laminated body itself has a damping function. It is a given high damping laminated rubber bearing (C).

Problems to be Solved by the Invention The laminated rubber bearings (a), (b) and (c) have the following problems, respectively.

Since the laminated rubber bearing (1) of the first type has a very small vibration damping ability, if it is used as it is, the vibration amplitude of the structure at the time of an earthquake becomes large and the safety is poor. Therefore, usually, the dampers are separately arranged in parallel and used. In this case, the point of action of the restoring force is different from the point of action of the damping force, which may give unnecessary torsional vibration to the structure.

Also, the above-mentioned second type lead-laminated rubber bearing (b)
, The lead plug (3) has a large initial shear rigidity against microvibration, as shown by the characteristic (S) in FIG. 28, so the vibration isolation performance is poor and the traffic vibrations caused by the passage of the vehicle, etc. Will be transmitted. Therefore, it has been difficult to apply it to buildings and floors where equipment that dislikes vibration is installed. In addition, due to the plasticity of lead, there is a problem that the recovery to the origin after large deformation is slow.

Further, the third type of high damping laminated rubber bearing (C) has a problem that the high damping rubber used has a large amount of creep and the restoring force against horizontal displacement is poor, so that the reliability is particularly low for long-term use. In addition, since the creep amount differs for each high damping laminated rubber bearing installed in parallel,
As a result of the seismic isolation operation, there is also a problem that the building undergoes a differential settlement phenomenon, causing unnecessary stress in the structure.

The present invention has been made in view of the actual situation of the laminated rubber bearings (a), (b) and (c), and a seismic isolation device in which the above problems are solved is formed on the basis of a structure and principle that are basically different from those. It is a proposal.

Means for Solving Problems A surrounding restraint type seismic isolation device newly proposed by the present invention includes a columnar rubber-like body arranged at a lower portion of a structure so as to support the vertical load, and a tensile body. It shows great rigidity against force, and includes a restraint member that surrounds the outer circumference of the rubber body and is stacked in the height direction.
A restraint body for restraining the protrusion of the rubber-like body to the outside is provided.

Action The seismic isolation device exhibits high vertical rigidity and load bearing capability while the columnar rubber body is constrained by the surrounding constraining bodies while having a large horizontal deformability. The restraint body and / or the rubber-like body exerts a vibration energy absorbing effect mainly by friction damping. This vibration absorption effect is also effective for minute vibrations.

Further, in the structure of the device of the present invention, the point of action of the restoring force and the point of action of the damping force are the same point, and unnecessary torsional vibration is not given to the structure.

From the above, the device of the present invention is a conventional laminated rubber bearing (a) (b) (c) as a damper integrated seismic isolation device.
Demonstrate performance equal to or higher than.

Further, since the columnar rubber-like body is used as a single body, it has become possible to use as the rubber-like body a kind of rubber that cannot be used in the case of the laminated structure.

Examples The device of the present invention has many examples corresponding to the difference in the structure of the restraint body. These will be described below in order.

First, a first embodiment, which is the most basic type of the present invention, will be described with reference to FIGS.

The seismic isolation apparatus A of the first embodiment is arranged around the columnar rubber-like body (11) and the restraining body (12) as a restraining member as shown in FIG. It consists of a restraint plate (13).

The rubber-like body (11) is formed in a prismatic shape having an arbitrary plane shape in addition to the columnar shape, and its material is natural rubber and its derivatives, various synthetic rubbers and elastomers showing rubber-like viscoelasticity such as rubber-like plastic. All included.

Further, since the rubber-like body (11) is used as a single body, nitrile butadiene rubber, which has been an obstacle to lamination in the related art,
High damping rubbers such as isobutylene-isoprene rubber, polynorbornene, butyl halides can also be used if desired.

A high-rigidity restraint plate (13), which is a restraint member, is arranged around the rubber-like body (11) as a restraint body (12) so as to restrain the protrusion to the outer peripheral side. As a result, the rubber-like body (11) and the seismic isolation device A exhibit high vertical rigidity and large vertical load supporting ability, and at the same time have low horizontal rigidity and large horizontal deformation ability.

A restraint plate (13), which is a restraint member constituting the restraint body (12), is mainly a steel plate having high rigidity so as to restrain the protrusion of the rubber-like body (11) with a large force.

The restraint body (12) of FIG. 1 is constituted by simply stacking a plurality of steel plates on the restraint plate (13), but one sheet is formed as shown in FIG. 4 showing an application example of the first embodiment. Alternatively, the rigidity and the damping performance of the seismic isolation device A can be arbitrarily adjusted by spirally connecting a plurality of steel plates to form a continuous body.

The treatment method between the constraining plates (13) to be laminated may be either a direct laminating method or a method of coating or laminating with a rubber having a small compression set.

Next, another application example of the first embodiment will be described with reference to FIGS.

As shown in the figure, this application example is fixed to the upper and lower structures of the seismic isolation device A of the first embodiment shown in FIG. 1, that is, the upper and lower surfaces of the rubber-like body (11), respectively. The fixing plates (14) (14) are joined together.

A steel plate is mainly used for the fixing plate (14) as well as the constraining plate (13).

The application example shown in FIG. 2 is for a plurality of constraining plates (1
The restraint body (12) is constructed by stacking 3), and the application example of FIG. 4 is the one in which the restraint plate (13) is formed in a spiral shape to construct the restraint body (12) as described above.

In the first embodiment, the rubber-like body is used alone as described above, and the laminated constraining plate (13) is arranged as the constraining body (12) around the rubber-like body. Can be obtained.

Since the structure is simple, it is easy to manufacture, so that the cost can be reduced.

When the upper and lower restraint plates (13) are arranged so as to rub against each other during the seismic isolation operation, the vibration energy is absorbed by friction, so that a damping effect is obtained, and even if the rubber-like body (11) is natural rubber, etc. -It will be an integrated seismic isolation device.

Further, in both cases where the constraining plates (13) rub against each other and where they do not rub against each other, a high damping rubber can be used because it gives a damping effect to the rubber-like body itself. Furthermore, the rigidity and damping performance of the device can be arbitrarily adjusted by the laminated state of the restraint plate (13). Moreover, the seismic isolation device with the integrated damper can be designed within a wide range of characteristics.

The rubber-like body (11) has high durability and fire resistance because the outer periphery, and also the upper and lower sides are protected by steel plates and the like.

Since the amount of steel used is small, the device is lightweight and easy to transport.

Next, a second embodiment of the present invention will be described with reference to FIGS.

In the seismic isolation device B of the second embodiment, as shown in FIGS. 5 and 6, a restraint body (12) for restraining the outward protrusion is provided around the columnar rubber-like body (11). The arrangement is the same as in the first embodiment.

The feature of the second embodiment is that the restraint body (12) is replaced by the rubber-like body (1
(1) A large number of restraint wire rods (1) that are wound around the periphery of 1) continuously or intermittently in a layered manner and arranged in a laminated manner.
It is composed by 5).

Here, a PC steel wire, a wire cord, or the like is used for the restraining wire (15) which is a restraining material, and as shown in FIG. 7 which is a partially enlarged view of the periphery of the rubber-like body (11), the restraining wire (15 ) Are arranged in a stack in the height direction and in parallel in the lateral direction. 8th
The figure shows how the restraint wire (15) is assembled, but by making each restraint wire (15) spiral and continuing in the height direction, the rigidity and damping performance of the seismic isolation device B can be arbitrarily set. It can be adjusted, and if necessary, the seismic isolation device B can be integrated with the damper.

The outer peripheral portion of the restraint wire (15) is protected by being covered with an elastic body (16) such as natural rubber or synthetic rubber having a small compression set, as shown in FIG. 7, if necessary. The elastic body (16) is integrated with the restraining wire (15) by vulcanization adhesion or the like.

FIG. 9 shows an embodiment in which a group of constraining wires (15) and elastic bodies (16) are alternately arranged in the vertical direction around the rubber-like body (11) to form a layer. is there.

When the seismic isolation device B having the above-described configuration is used, as shown in FIG. 5, a fixing plate such as a plate is fixed to the upper and lower structures of the rubber-like body (11), respectively. 17) (17) is joined.

As described above, the second embodiment has a configuration in which the rubber-like body is used as a single body and is restrained by a large number of restraint wires (15) which are restraint materials arranged around the rubber-like body. The same effect as that of the first embodiment can be obtained.

In the first and second embodiments, when the restraint plate or restraint wire which is the restraint material is a single substance, the vibration energy is absorbed by the friction energy of the restraint plate or the restraint wire, so that the central rubber-like body may be of any type. When fixed with a rubber having a small compression set, the central rubber-like body preferably has a high damping.

Next, a third embodiment of the present invention will be described with reference to FIGS.

The seismic isolation device C of the third embodiment is a further development of the seismic isolation device A of the first embodiment.

In the seismic isolation apparatus A of the first embodiment, noise is generated when a horizontal vibration damping effect is provided by the dynamic friction between the restraint plates (13) that are restraint members that constitute the restraint body (12). As a result, a small vertical vibration is generated, which causes an unfavorable situation as a seismic isolation device. This vibration increases when the difference between static friction and dynamic friction is large. Therefore, the third embodiment provides a specific configuration capable of eliminating vertical vibration while effectively exhibiting the damping effect due to this friction.

First, the basic concept of the seismic isolation apparatus C, which is the third embodiment, will be described.

FIG. 10 to FIG. 12 show three basic structural examples (C ₁ ) (C ₂ ) (C ₃ ) of the seismic isolation device C of the third embodiment, which are columnar rubber-like bodies (11). (12) Constraints placed in layers around the
Have different structures. Here, the columnar rubber-like body (11) placed in the center and subjected to the vertical load of the structure is −10 at a dynamic strain rate of 0.5% at 0.5 Hz when high damping rubber is used.
It is preferable that the loss (TAN δ) at -40 ° C is in the range of 0.1 to 1.5. This is because if the loss (TAN δ) exceeds 1.5, the vibration isolation in the vertical direction above 10 Hz will deteriorate, and if it is less than 0.1 it will not contribute much to the improvement of damping performance in the horizontal shear direction.

The structure of each restraint body (12) in the following basic configuration examples (C ₁ ) (C ₂ ) (C ₃ ) will be sequentially described.

The restraint body (12) of the first structural example (C ₁ ) shown in FIGS. 10 (a) and 10 (b) is a ring-shaped rubber elastic plate (18) having a small compression set and a steel plate as a restraining material. Ring-shaped restraint plate (1
9) and one surface are fixed to each other, and the antifriction material (20) is sandwiched between them. Here, the fixing includes pasting or vulcanization adhesion.

The restraint body (12) of the second configuration example (C ₂ ) shown in FIGS. 11 (a) and 11 (b) is restrained on the front and back surfaces of the ring-shaped rubber elastic plate (21) having a small compression set. A ring-shaped restraint plate (22) such as a steel plate, which is a material, is fixed one by one, and has a three-layer structure, and is laminated with an antifriction material (20) sandwiched therebetween.

The constraining body (12) of the third structural example (C ₃ ) shown in FIGS. 12 (a) and (b) is compressed on the front and back surfaces of a ring-shaped constraining plate (23) such as a steel plate as a constraining material. A ring-shaped rubber-like elastic plate (24) having a small permanent strain is fixed one by one to have a three-layer structure, and the antifriction material (20) is sandwiched between the laminated layers.

Here, the restraint plates (19) (22) (23) which are the restraint members.
Should have high rigidity and high breaking strength,
Materials other than steel plates can also be used.

Rubber-like elastic plates with a small compression set (18) (21)
(24) may be an elastic body having the same properties as a rubber material. Desirable compression set is 70 ℃ -22HR based on JIS-K6301 for the restraint body (12) to exert its effective function.
It is 35% or less by heat treatment, and particularly 20% or less shows good properties.

The antifriction material (20) may be any material that reduces the difference between static friction and dynamic friction between the constraining plates. For example, silicone grease, Teflon, or other resin with a small friction coefficient, or a member impregnated with a lubricant is used. To be done. These antifriction agents (20)
The attachment is performed by applying, coating, or fixing to the sliding surface of the constraining plate or the rubber-like elastic plate according to its property.

Note that the restraint body (12) is not limited to the above-mentioned configuration example, in short, a rubber-like elastic plate having a spacer function is fixed to a hard restraint plate which is a restraint material, and these are laminated with an antifriction material sandwiched therebetween. It should have been done. For example, if the rubber-like body (11) has a prismatic shape, the planar shape of the restraining body (12) becomes a corresponding square shape. Further, the restraint body (12) may be one in which a restraint plate to which a rubber-like elastic plate is fixed is bent in a spiral shape and laminated.

Next, a manufacturing example in which the above basic configuration example of the third embodiment is embodied will be described with reference to FIGS. 13 and 14, and the characteristics obtained thereby will be described.

The seismic isolation device (25), which is the first manufacturing example of the third embodiment shown in FIG. 13, corresponds to the basic configuration device (C ₁ ) previously described in FIG. 10, and has an upper structure. A cylindrical rubber-like body (11) and a restraining body (12) surrounding the rubber-like body (11) are sandwiched and fixed between fixing plates (26, 26) fixed to the object and the lower structure.

The rubber-like body (11) has pressure-receiving plates (27) and (27) embedded on both end faces and is bonded to it. The material used is natural rubber or high-damping rubber isobutylene-isoprene rubber with a tan δ of about 0.3. . A restraint plate (19) that constitutes the restraint body (12)
The thickness ratio of the rubber-like elastic plate (18) is 2: 1 and the antifriction material (2
For 0), silicone grease with a viscosity of 300,000 cSc (at 25 ° C) or Teflon resin sheet is used.

Next, the seismic isolation device (28), which is the second manufacturing example of the third embodiment shown in FIG. 14, corresponds to the basic configuration example (C ₂ ) previously described in FIG. The difference from that shown in FIG. 4 is that the restraint body (12) is formed by laminating a three-layer structure in which a rubber-like elastic body (21) is sandwiched between two restraint plates (22) and (22). That is what I did. The thickness ratio of each restraint plate (22) and the rubber-like elastic plate (21) is 1: 1.

Load measured on the first production example shown in FIG. 13 above-
The displacement curves are as shown in FIGS. 15, 16 and 17, respectively. Here, FIG. 15 shows characteristics when the material of the rubber-like body (11) is natural rubber (NR) and the antifriction material (20) is silicone grease. FIG. 16 shows characteristics when the material of the rubber-like body (11) is high damping rubber (IIR) and the antifriction material (20) is silicone grease. FIG. 17 shows characteristics when the material of the rubber-like body (11) is a high damping rubber and the antifriction material (20) is a Teflon resin sheet. In addition, when the materials of the rubber-like body (11) and the antifriction material (20) are selected in the same manner as in the above-mentioned example in the second manufacturing example (28), the same characteristics as these are obtained. It was Comparing these with the load-displacement curve of the lead-laminated bearing (b) shown in FIG. 28, it can be seen that the rigidity against small displacement is small and the vibration-damping effect is exhibited even against small vibration. Comparing this numerically, it becomes as shown in Table 1.

That is, the seismic isolation device C of the third embodiment has a shear rigidity at a horizontal displacement of 2 mm of 1/3 to 1/6 that of the lead-laminated rubber bearing (C), which is extremely good against microvibration. It can be seen that it exhibits damping performance. In addition, the damping constant h proportional to the area surrounded by the hysteresis curve is 0.1% of the damping factor of the seismic isolation device that is generally required in each manufacturing example.
Is over. In particular, in the manufacturing example using silicone grease and high damping rubber (Fig. 16), the damping effect due to the viscosity of silicone grease was added, increasing to 0.17, and a good effect was obtained.

Next, regarding the vertical / shear (horizontal) rigidity ratio Kv / KH, which is the basic characteristic required for seismic isolation, the above production example using natural rubber and silicone grease (Fig. 15) and the natural rubber shown in Fig. 26. Table 2 shows a comparison with the laminated rubber bearing (a) using.

According to Table 2, the vertical loading capacity shows similar performance,
The horizontal shear rigidity K _H is smaller in the third embodiment of the present invention, and the rigidity ratio Kv / K _H reaches about twice. From this, it can be said that the seismic isolation capacity is higher than the conventional one.

From the comparison of the numerical data in Tables 1 and 2 above, it is clear that the seismic isolation device C of the third embodiment of the present invention has equivalent or higher performance than the conventional laminated rubber bearing. I was killed.

Next, a fourth embodiment of the present invention will be described with reference to FIGS.

The seismic isolation apparatus D which is the fourth embodiment restrains the small restoring force of the high damping rubber when using high damping rubber such as isobutylene-isopyrene rubber or polynorbornene as the rubber-like body (11). Complemented by the body (12), the selection range of high damping rubber is widened.

First, a representative example of the seismic isolation device D of the fourth embodiment will be described in detail as a _first structural example (D ₁ ).

The first structure (D ₁ ) is, as shown in FIGS. 18 (a) and 18 (b), a rubber-like body (11) of high-damping rubber sandwiched between upper and lower pressure receiving plates (30) (30). ) Is enclosed in the through hole (31) formed in the up-down direction of the restraining body (12). This restraint body (12)
A ring-shaped rubber-like elastic body (32) having a small compression set and a ring-shaped hard body (33) such as a steel plate which is a restraint material are alternately laminated and fixed by lamination. It should be noted that the ring-shaped pressure receiving plates (34) (34) are separately provided on the upper and lower surfaces of the restraining body (12) for the convenience of assembly, and the pressure receiving plates (34) (34) are It may be integrated with the pressure receiving plates (30) (30) made of rubber.

Next, a specific manufacturing example (d ₁ ) of the _first structural example (D ₁ ) will be described with reference to FIGS. 19 (a) and (b).

A cylindrical rubber-like body (11) made of high-damping rubber is sandwiched and fixed to the pressure receiving plates (30) (30). In addition, each rubber-like elastic body (32) of the restraint body (12) is connected and integrated on the inner surface in close contact with the outer peripheral surface of the rubber-like body (11), and the hard body (33) as a restraining member is the restraint body ( It projects only on the outer circumference of 12).

The high damping rubber used for this rubber-like body (11) has a temperature of 25 ° C.
-A polynorbornene rubber with a tan δ of about 0.8 at a frequency of 0.5 Hz is used, and as the rubber-like elastic body (32) that constitutes the restraining body (12) and has a low compression set, natural rubber (NR) is used.
Is used.

The characteristics obtained by the above specific manufacturing example (d ₁ ) are
Table 3 shows a comparison with the conventional laminated rubber bearing (a) shown in the figure and the lead-laminated rubber bearing (b) shown in FIG.

Looking at the damping performance in Table 3, the damping constant of the seismic isolation device D of the production example (d ₁ ) is about 0.13, which is higher than that of the laminated rubber bearing (a) of the comparative example. This value exceeds the generally required damping constant of 0.10, which is preferable for practical use.

In addition, the initial rigidity during shear deformation due to microvibration, which was a problem with the lead-laminated rubber bearing (b), was as low as 0.44 compared to 1.15 TON / cm of the comparative example (b), It can be seen that the anti-vibration characteristics have been greatly improved.

In order to investigate the durability of the high damping rubber used for the rubber-like body (11), the seismic isolation device (D ₁ ) of the production example (d ₁ ) of the fourth embodiment shown in FIG. Frequency 0.2Hz-Amplitude ± 107mm
Deformation was repeated 360 times under the condition of, and after this, the highly damped rubber that was the rubber-like body (11) was taken out from the restraint body (12) and the surface condition was observed. I was not able to admit.

Since the seismic isolation device D of the fourth embodiment has many structural examples other than this, it will be sequentially described.

As in the case of the first structural example (D ₁ ) shown in FIG. 18, a structure in which a high-damping rubber that is a rubber-like body (11) is installed vertically through a restraining body (12) is the 20th structure. There are a second structural example (D ₂ ) shown in FIGS. (A) and (b) and a third structural example (D ₃ ) shown in FIGS. 21 (a) and (b).

These structural examples show that there may be a plurality of highly damped rubbers enclosed inside as the rubber-like body (11), and that the shape can take any shape such as a column or a prism.

In addition, as a rubber-like body (11), a plurality of high-damping rubbers are completely partitioned and arranged in the vertical direction, as shown in FIG.
A fourth structural example (D ₄ ) shown in (b) and a fifth structural example shown in FIG.
There is a structural example (D ₅ ). Examples of these structures (D ₄ ) (D ₄ )
In the restraint body (12), a rigid body (33a) having no hole as a restraint body is used as a restraint member, whereby the high damping rubber which is the rubber body (11) is completely partitioned in the vertical direction. The fourth structural example (D ₄ ) uses a plurality of flat, high-damping rubbers as the rubber-like body (11). In addition, in the fifth structural example (D ₅ ), the restraining body (12) has a rectangular prism shape, and the loading body (1
As 1), 4 columns of high damping rubber are placed.

Next, the vertical partition of the rubber-like body (11) is restrained by the restraining body (1
Apart from the hard body (33b) which is the restraint material of 2), the partition plate (33c) embedded in the high damping rubber is used as the sixth embodiment shown in FIGS. 24 (a) and (b). Structural example (D ₆ ),
And a seventh structural example (D ₇ ) shown in FIGS. 25 (a) and 25 (b). The difference between the sixth structural example (D ₆ ) and the seventh structural example (D ₇ ) is that the shape is cylindrical or square, and that the partition plate (33
c) is at the same height as the rigid body (33b) that is the restraint,
It is the difference between being staggered. These sixth and seventh structural example (D ₆₎ (D ₇₎ is made of a hard material which is bound material restraint (12) (33b) is come completely fills the interior of the restraint (12) It is different from the _first to fifth structural examples (D ₁ ) to (D ₅ ) in that they are rare.

As mentioned above, the 1st-7th of the seismic isolation apparatus D of the 4th Example of this invention.
However, the fourth embodiment can be implemented in various structures by combining the features of the respective portions appearing in the above-described structure examples in different forms.

For example, in the first to fifth structural examples, the hard bodies (33) (33a), which are the restraint members, protrude from the restraint body (12), and in the sixth and seventh structural examples, conversely, they are completely filled. Although this is involved, any shape can be adopted in each structural example.

In the fourth embodiment, the desirable compression set of the rubber-like elastic body (32) used for the restraining body (12) is JI.
A heat treatment of 70 ° C-22HR based on S-K6301 of 35% or less is necessary to give an appropriate restoring force to the restraining body (12). This gives good properties, especially below 20%.

The high damping rubber used for the rubber-like body (11) is 0.5Hz.
At a dynamic strain rate of 0.5% at -10 to 40 ° C (TAN
Those in which δ) is in the range of 0.1 to 1.5 are preferred. Loss (TAN δ)
If the ratio exceeds 1.5, the vibration damping property in the vertical direction of 10 HZ or more becomes poor, and if it is less than 0.1, it does not contribute much to the improvement of the damping performance in the horizontal shearing direction.

In the seismic isolation device D of the fourth embodiment, the restraining body (12) is integrated, and the rubber-like body (11) inside is elastically restrained in a uniform and stable state over the entire circumferential surface. The feature is that a high damping rubber having a large compression set can be used in a stable state without creep phenomenon, and an elastic force of the restraining body (12) gives an appropriate horizontal restoring force to the seismic isolation device.

In the seismic isolation device D of the fourth embodiment of the present invention, the vertical load is mostly borne by the high damping rubber, and energy absorption is mainly performed by intermolecular friction of the high damping rubber. The mechanism is fundamentally different from the conventional lead-laminated rubber bearing (b) shown in FIG. This is because in the lead-laminated rubber bearing (b), the vertical load is borne by the laminated body of the surrounding steel plate and the thin rubber plate, and energy absorption is performed by plastic deformation of lead.

EFFECTS OF THE INVENTION According to the present invention, it is possible to provide a seismic isolation device having a large vertical loading capacity that can replace the conventional laminated rubber bearing by using a rubber-like body that is not laminated.

In particular, the seismic isolation device of the present invention does not use a material having a large initial rigidity such as lead in order to obtain a damping function, and therefore also has a vibration-proof property at the time of slight vibration, and the selection range of the constraining body and the rubber-like body. It is possible to design a wide range of characteristics. Therefore, in addition to seismic isolation and vibration isolation of buildings, it is also suitable for seismic isolation and isolation of floors in buildings, as well as seismic isolation and isolation of power transmission equipment and general equipment.

[Brief description of drawings]

1 to 4 show a seismic isolation device A according to a first embodiment of the present invention.
FIG. 1 is a sectional view showing a basic structure, FIGS. 2 and 3 are plan views and sectional views showing an application example, and FIG. 4 is a side view showing another application example. 5 to 9 show seismic isolation device B of the second embodiment of the present invention.
5 is a sectional view showing the basic structure, FIG. 6 is a plan view thereof, FIG. 7 is a partially enlarged sectional view of FIG. 5, and FIG.
FIG. 9 is a perspective view showing a restraint wire, and FIG. 9 is a partial cross-sectional view showing a configuration example around a rubber body. 10 to 17 are seismic isolation devices C according to the third embodiment of the present invention.
FIGS. 10 (a), (b), and FIG. 11 (a) are diagrams for explaining
(B), FIG. 12 (a) and (b) respectively show three examples of the basic structure of the third embodiment, (a) of each figure is a plan view, (b) of each figure is a sectional view. Is. FIG. 13 is a cross-sectional view showing a manufacturing example in which the basic structure example (C ₁ ) shown in FIG. 10 is embodied,
FIG. 14 is a cross-sectional view showing a production example in which the basic structure example (C ₂ ) shown in FIG. 11 is embodied. FIG. 15 to FIG. 17 are load-displacement curves when the materials of the rubber-like body and the antifriction material are changed in the specific production example shown in FIG. 18 to 25 show the seismic isolation device D of the fourth embodiment of the present invention.
18A and 18B are a plan view and a cross-sectional view showing a _first structural example (D ₁ ). Figure 19 (a)
18B is a plan view and a sectional view, respectively, showing a production example (d ₁ ) of the first structural example (D ₁ ) shown in FIGS. 18A and 18B. Figures 20 (a) (b) to 25 (a) (b)
Second to seventh structural examples of the embodiment are shown, (a) of each drawing is a plan view, and (b) of each drawing is a sectional view. 26 to 28 show a conventional example, and FIGS. 26 (a) and (b) are a plan view and a sectional view of a laminated rubber bearing (a) or a high damping laminated rubber bearing (c), and FIG. 27 (a). ) (B) is
Lead-laminated rubber bearing (b) plan view and cross-sectional view,
Fig. 28 is a load-displacement curve of the lead-laminated rubber bearing (b) shown in Fig. 27. (11) …… Rubber, (12) Restraint, (13) (15) (1
9) (22) (23) (33) (33a) (33b) …… Restraint,
(A) ... the seismic isolation device according to the first embodiment of the present invention,
(B) ... A seismic isolation device according to a second embodiment of the present invention,
(C) ... a seismic isolation device according to a third embodiment of the present invention,
(D) ... A seismic isolation device according to a fourth embodiment of the present invention.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Fumiaki Arima 3-9-7 Chiyoda Sagamihara-shi, Kanagawa May Corp. (72) Inventor Hisaya Tanaka 2-37-23, Higashidori, Oyama-shi, Tochigi HG Tateshina No. 205

Claims (1)

[Claims] 1. A columnar rubber-like body arranged to support a vertical load on the lower part of the structure, and showing a high rigidity against a tensile force, and surrounding the outer periphery of the rubber-like body, A perimeter restraint type seismic isolation device, comprising: a restraint member arranged in a stack in the depth direction, and a restraint member restraining the protrusion of the rubber body to the outside.