JPH1046869A - Multilayer type viscous damper for vibration-isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the damping effect of a viscous damper for a vibration- isolation device in the lower section of a large-scale and multi-storied building, and to narrow the place of installation and compact the vibration-isolation device. SOLUTION: A downward support member 5 is installed to the lower section of a structure 2 supported by a bearing body in a horizontally displaceable manner, a horizontal movable resistance plate 6 is mounted to the lower section of the support member 5, and the movable resistance plate 6 is immersed into a viscous liquid 9 in a vessel 4 set up on a foundation 1, and arranged so as to form a specified space (d) between the movable resistance plate 6 and the base of the vessel 4. A plurality of horizontal movable resistance plates 7 are fitted onto the outer circumference of a section immersed into the viscous liquid 9 of the support member 5 in the vertical direction at intervals, and a plurality of horizontal fixed plates 8 having lapping sections (s) while being disposed at regular intervals (k) are installed on the inwall side of the vessel 4 in the vertical direction among the upper and lower movable resistance plates 7, 7 on the outer circumference of the support member 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a viscous damper of a seismic isolation device for attenuating seismic energy transmitted from a foundation to a structure, and more particularly, to a large damping effect corresponding to a high-rise large-scale building. The present invention relates to a multi-layered viscous damper that is effective and compactly implemented at the bottom of a large building.

[0002]

2. Description of the Related Art Viscous dampers of seismic isolation devices have an effect of damping small deformations, exhibit excellent properties especially when the natural period of an upper frame is long, and have been variously developed. JP-A-60-168875, JP-B-6-1988
See 3-35792 and the like). Generally, FIG.
As shown in FIG. 2, the supporting member 3 is made of a combination of a bearing body 3 such as a laminated rubber shown on the left side of the figure and a viscous damper shown on the right side. The support 3 is installed between the foundation 1 and the lower part of the structure 2, and supports the structure 2 so as to be able to move horizontally. In the viscous damper, a downward supporting member 5 is installed below the structure 2 supported by the support body 3,
A movable resistance plate 6 made of a single disk is horizontally installed below the support member 5. And the movable resistance plate 6
Is immersed in a viscous liquid 9 contained in a container 4 installed on the foundation 1 and is disposed with a small distance d between the container 4 and the bottom surface of the container 4. It is configured to absorb seismic energy by shear resistance. It is known that the magnitude of the seismic energy to be absorbed is proportional to the area of the resistance plate and the viscosity coefficient of the viscous liquid, and is inversely proportional to the distance d.

[0003]

The conventional viscous damper illustrated in FIG. 2 has a one-plane shear resistance of a movable resistance plate 6 (disk) immersed in a viscous liquid 9 in a container 4 and has a seismic energy. Has been absorbed. On the other hand, in order to increase the absorbed seismic energy in response to the recent increase in the size and rise of the seismic isolation building, the area of the movable resistance plate 6 must be increased. Therefore, the viscous damper of the seismic isolation device has been increased in size, and it has become a problem how to secure the installation place.

Accordingly, an object of the present invention is to provide a multi-layer viscous damper capable of realizing a large damping action by using a plurality of movable resistive plates and capable of saving space in a seismic isolation device due to its compact design. It is in.

[0005]

As a means for solving the problem of the prior art, a multi-layered viscous damper of a seismic isolation device according to the first aspect of the present invention is supported by a bearing body 3 so as to be horizontally movable. A downward supporting member 5 is installed below the object 2, and a horizontal movable resistance plate 6 is installed below the supporting member 5. The movable resistance plate 6 is made of a viscous material contained in a container 4 installed on the foundation 1. In a viscous damper immersed in the liquid 9 and arranged at a predetermined distance d from the bottom surface of the container 4, a plurality of portions of the support member 5, which are immersed in the viscous liquid 9, Are installed in the up and down direction at intervals, and the plurality of movable resistance plates 7
A plurality of fixing plates 8 having a wrap portion s between them and arranged horizontally at a predetermined interval k are provided vertically on the inner wall side of the container 4.

According to a second aspect of the present invention, there is provided a multi-layer viscous damper for a seismic isolation device, wherein the support member according to the first aspect is immersed in a receiving shaft fixed to a lower portion of a structure and a viscous liquid. And a plate mounting shaft 5b that supports the plurality of movable resistance plates 6 and 7 is slidably connected by a slide bearing.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A multi-layered viscous damper of a seismic isolation device according to the present invention is designed to absorb a seismic energy in a horizontal direction. It is preferably carried out. The seismic isolation device having the multilayer viscous damper shown in FIG. 1 is configured by a combination with a bearing 3 such as a laminated rubber shown on the left side of FIG.

The multilayer viscous damper comprises a support member 5 installed at the lowermost part of the structure 2, a main movable resistance plate 6 and a plurality of sub movable resistance plates 7 supported by the support member 5, And a viscous liquid 9 contained in the container 4 installed on the foundation 1 for immersing the sub movable resistance plates 6, 7.
A plurality of fixing plates 8 fixed to the container 4 are provided (claim 1). As the viscous liquid 9, a polymer viscous substance such as silicone oil or polypropylene is used.

The support member 5 comprises a receiving shaft 5a and a plate mounting shaft 5b for supporting the movable resistance plates 6, 7,... (Claim 2). The outer peripheral surface of the receiving shaft 5a is processed with a fluororesin such as Teflon (trade name) and fixed to the lower portion of the structure 2. The plate mounting shaft 5b is located at a certain height in the viscous liquid 9 while maintaining a state of equilibrium with the buoyancy acting on the shaft and the movable resistance plates 6, 7,... With respect to the receiving shaft 5a. It can slide up and down by a sliding bearing,
The transmission of horizontal forces is connected as possible.

The space between the disk-shaped main movable resistance plate 6 installed at the lowermost part of the plate mounting shaft 5b of the support member 5 and the bottom surface of the container 4 has a small size of about several mm so that viscous resistance acts. An interval d is secured. A plurality of donut-shaped auxiliary movable resistance plates 7 are horizontally arranged on the outer periphery of a portion of the plate mounting shaft 5b immersed in the viscous liquid 9 and are arranged in a multilayered (laminated) configuration at intervals. Have been. Sub movable resistance plate 7
Is three in the illustrated example, but the number is not limited to three. The distance between the sub movable resistance plates 7 and 7 may be any distance between the sub movable resistance plates 7 and 7 and the fixed plate 8 partially wrapped as described below so that a minute distance k that can use the viscous resistance of the viscous liquid 9 can be secured.

A donut-shaped fixing plate 8 is provided on the inner wall surface of the container 4.
Are installed. Each fixing plate 8 is connected to the support member 5.
Have a wrap portion s having a length of several tens of millimeters at a neutral position between each of the movable resistance plates 6, 7,. The movable resistance plate 6) is arranged in a vertical direction in a multilayer shape with a small interval k of several mm at which viscous resistance acts. Although the number of the fixed plates 8 is three in the illustrated example, the number is not limited to three and is equal to the number of the sub movable resistance plates 7.

Therefore, in the multilayer viscous damper having the above structure, when an earthquake occurs, the viscous shear resistance force is applied to the distance d between the lower surface of the main movable resistance plate 6 immersed in the viscous liquid 9 and the bottom surface of the container 4. Occurs. Further, the viscous shearing resistance force also acts on the plurality of auxiliary movable resistance plates 7 and the distance k between the fixed movable plates 8 wrapped with the auxiliary movable resistance plates 7. Therefore, the plurality of main and sub movable resistance plates 6,
The seismic energy acting on the support member 5 and the structure 2 can be effectively attenuated by the sum of the viscous shear resistance forces acting on the distances d and k in 7. Moreover, a plate mounting shaft 5b for supporting the main and sub movable resistance plates 6, 7,...
Are slidable with respect to the receiving shaft 5a on the side of the structure 2, so that vertical vibrations and creep deformation of the structure 2 due to the earthquake are not directly transmitted to the movable resistance plates 6, 7,. By keeping d and k constant, the damping action is always kept constant.

[0013]

According to the multi-layered viscous damper of the seismic isolation device of the present invention, a plurality of main and sub movable resistive plates are formed in a multi-layer, so that they have substantially the same plane area as the conventional viscous damper. A large damping effect is exhibited. Therefore, in large-scale buildings, the installation space is not required, and the seismic isolation layer between the foundation and the structure saves space, and the space available for the foundation beam is effectively used as equipment space. Provided.
Furthermore, since the high-performance multi-layer viscous damper is used, the number of the dampers can be reduced, which contributes to a reduction in cost required for the entire seismic isolation device.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a multilayer viscous damper.

FIG. 2 is a sectional view showing a conventional seismic isolation device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Foundation 2 Structure 3 Bearing 4 Container 5 Supporting member 5a Bearing shaft 5b Plate mounting shaft 6 Main movable resistance plate 7 Sub movable resistance plate 8 Fixed plate 9 Viscous liquid

Continuing from the front page (72) Inventor Takaaki Hiroshige 8-21-1, Ginza, Chuo-ku, Tokyo Inside the Takenaka Corporation Tokyo Main Store (72) Inventor Noriaki Hirano 8-2-1-1, Ginza, Chuo-ku, Tokyo Stock Takenaka Corporation Tokyo head office

Claims (2)

[Claims] 1. A downward supporting member is installed below a structure supported horizontally by a bearing body, and a horizontal movable resistance plate is installed below the supporting member. A viscous damper immersed in a viscous liquid contained in an installed container and disposed at a predetermined distance from the bottom surface of the container, wherein a portion of the support member immersed in the viscous liquid A plurality of horizontal movable resistance plates are installed in the vertical direction at an interval on the outer periphery of the plurality of movable resistance plates, and have a lap portion between each of the plurality of movable resistance plates and are horizontally arranged at a predetermined interval. A multi-layer viscous damper for a seismic isolation device, characterized in that a plurality of fixed plates are installed vertically on the inner wall side of the container. 2. A structure wherein a support shaft fixed to a lower portion of a structure and a plate mounting shaft supporting a plurality of movable resistance plates immersed in a viscous liquid are slidably connected by a slide bearing. The multilayer viscous damper of the seismic isolation device according to claim 1, wherein: