JPH04122837U - Seismic isolation isolator - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a seismic isolation isolator that can exhibit good damping properties regardless of the magnitude of displacement and has little offset. [Structure] A plurality of rubber layers 3 constituting the rubber laminate 5 are
Highly elastic rubber 3a with tan δ (loss coefficient) of 0.1 or less and ta
It is configured in combination with high damping rubber 3b with n б of 0.15 or more. [Effects] The structure is simple and easy to install, and it exhibits uniform and good damping regardless of the magnitude of displacement or load direction, and has little offset.

Description

[Detailed explanation of the idea]

0001 [Purpose of invention]

0002

[Industrial application field]

The present invention relates to a seismic isolation isolator that obstructs a building and protects it from earthquakes.

0003

[Conventional technology]

Traditionally, seismic isolation isolators have multiple rubber layers alternately interposed between steel plates. It is made up of rubber laminates that are stacked one on top of the other.

0004 This kind of seismic isolation isolator supports the large weight of the structure, and its kinetic energy is Since it is also large, a damper of some kind is required. This damper - The method uses the viscous resistance of fluid, or the plastic deformation of metal rods such as steel and lead. One that uses shaped resistance is known.

[0005] Those with dampers that utilize the viscous resistance of the fluid mentioned above provide resistance to the bottom of the building. A board is fixed, and a viscous fluid such as silicone oil is placed on the foundation opposite it. The viscous fluid can be agitated using a resistance plate, but the rubber laminate and damper Disadvantages of requiring a lot of installation space and work time because they are configured separately There is.

[0006] In addition, those with a damper that utilizes the plastic deformation resistance of the metal rod are laminated with rubber. Since it has a built-in metal rod in the center of the body, there are few problems with installation space etc. .

[0007]

[Problem that the idea aims to solve]

However, dampers that utilize the above plastic deformation resistance are Since it has the same effect as a resistor, it does not return to its original position after operation, causing an offset. There is a drawback that If the damping force is weakened, the offset will be reduced. However, it becomes difficult to attenuate vibrations.

[0008] The present invention was made to solve these conventional difficulties, and it is possible to A seismic isolation device that can exhibit good damping characteristics regardless of the The purpose is to provide isolators.

[0009]

[Structure of the idea]

0010

[Means to solve the problem]

The seismic isolation isolator of this invention consists of multiple rubber layers and rigid plates stacked alternately. In the seismic isolation isolator, the plurality of rubber layers have a tan δ (loss coefficient) of 0. 1 or less high elasticity rubber and high damping rubber with tan δ of 0.15 or more are combined. It is characterized by having been accomplished.

[0011] The high elasticity rubber may include natural rubber, and the high damping rubber may include natural rubber. For example, natural rubber (tan δ is 0.05 to 0.09) or chloroprene rubber (tan δ is 0.05 to 0.09) 0.15~0.22) and chemically bond them with nylon staple fibers to increase the tan δ value. For example, one that has been processed to have a value of about 0.15 to 0.25 is suitable. As other compounding agents For example, graphite, flat talc, mica, acetylene black, etc. can be added. It is. If too much of the compounding agent is added to increase the tan δ value, The type of compounding agent may become harder and less elongated, making creep more likely to occur. and the amount needs to be adjusted accordingly.

0012 In addition, as a combination of high elasticity rubber and high damping rubber, both can be connected through a rigid plate. Some are stacked alternately, and others are placed separately on the inside and outside of a concentric circle. .

[0013]

[Effect] In this invention, high damping rubber, which is a rubber material with good damping properties, is used. By combining high elastic rubber to create a rubber laminate, installation is easy and soft. It is possible to construct a device with a low resonant frequency. Also added to high damping rubber The damping characteristics can be selected from a wide range depending on the characteristics of the compounding agent, and the damping characteristics can be adjusted to some extent. Even if the distance is long, the initial displacement can be made small.

[0014]

【Example】

DESCRIPTION OF THE PREFERRED EMBODIMENTS The seismic isolation isolator of the present invention will be explained below according to the embodiment shown in the drawings. Figure 1 FIG. 2 is a diagram showing an embodiment of the present invention.

[0015] In Fig. 1, there is a multi-layer structure between two iron end plates 1 and 2 that are placed opposite each other with a gap between them. Several rubber layers and rigid plates 4 such as steel plates are arranged alternately to form a cylindrical rubber layer. A body 5 is formed.

[0016] The plurality of rubber layers 3 are made of high elastic rubber with tan δ (loss coefficient) of 0.1 or less and tan δ Rubber with high damping properties of 0.15 or higher are alternately layered. That is, rubber laminate 5 is a high-elastic rubber 3a bonded to a rigid plate 4a as shown in FIG. Multiple sets of damping rubber 3b bonded to other rigid plates 4b are stacked alternately. It is what it is. Each high elastic rubber 3a and each other rigid plate 4b are glued together. It may be attached or not bonded.

[0017] In the case where each high elastic rubber 3a and each other rigid plate 4b are bonded, it is not shown. However, they are firmly bonded to each other by being placed in a specified mold and vulcanized. . In addition, when each layer is not bonded, the non-bonded surfaces of each rigid plate 4a, 4b are shot Ning or pressing to create fine irregularities (depth 0.2 to 0.4 mm, pitch 0.5 to 10 mm) It is preferable to increase the anti-slip force by providing a mesh pattern.

Furthermore, the thickness (t ₁ ) of the high-elasticity rubber 3a and the thickness (t ₂ ) of the high-damping rubber 3b are approximately equal to their respective elastic moduli (E ₁ ), E ₂ ), as shown in the following equations. The thickness should be proportional.

t ₁ =E ₁ ·t/(E ₁ +E ₂ ), t ₂ =E ₂ ·t/(E 1 +E ₂ ) The rubber laminate may be constructed as shown in FIG. 3. That is, in FIG. 3, a high elastic rubber 7a is arranged inside the concentric circle of the disk-shaped rigid plate 6, a high damping rubber 7b is arranged outside the concentric circle of the same rigid plate 6, and these multiple sets are overlapped. It is something. Alternatively, the high damping rubber 7b is arranged inside the concentric circle of the disk-shaped rigid plate 6, and the high elastic rubber 7a is arranged outside the concentric circle of the same rigid plate 6, and a plurality of these sets are overlapped. Good too. In these cases as well, the plurality of superimposed sets may or may not be glued together. Further, the area ratio of the high damping rubber 7b to the high elastic rubber 7a is 50% or less. If the proportion of the high damping rubber 7b exceeds 50%, the overall tan δ value will increase, the rubber layer will become hard and its elongation will decrease, and creep will likely occur.

[0020]

[Effect of the idea]

As explained above, according to the present invention, high damping rubber with good damping characteristics is used. Combined with elastic rubber, the structure is simple and easy to install, and the displacement It exhibits uniform and good damping characteristics regardless of the size of the load and the direction of the load. In both cases, the effect of reducing offset can be obtained.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing essential parts of an embodiment of the present invention.

FIG. 3 is a sectional view showing essential parts of another embodiment of the present invention.

[Explanation of symbols]

1, 2...end plate 3……Rubber layer 3a……High elastic rubber 3b……High damping rubber 4, 4a, 4b……Rigid plate 5……Rubber laminate 6……Rigid plate 7a……High elastic rubber 7b……High damping rubber

──────────────────────────────────────────────── ─── Continuation of front page (72) Creator Kazuya Shimizu 2-1-1 Oda Sakae, Kawasaki Ward, Kawasaki City, Kanagawa Prefecture No. Showa Cable and Wire Co., Ltd. (72) Creator Katsumi Shimizu 2-1-1 Oda Sakae, Kawasaki Ward, Kawasaki City, Kanagawa Prefecture No. Showa Cable and Wire Co., Ltd.

Claims (1)

[Scope of utility model registration request] Claim 1: A seismic isolation isolator comprising a plurality of rubber layers and rigid plates stacked alternately, wherein the plurality of rubber layers are made of high elastic rubber with a tan δ (loss coefficient) of 0.1 or less, and a ta
A seismic isolation isolator characterized in that it is configured in combination with highly damping rubber having n δ of 0.15 or more.