JPH01244083A - Vibration isolating structure - Google Patents

Abstract

PURPOSE:To reduce effectively the vibration of a structure, and at the same time, to keep the time-elapsed reliability by providing vibration control devices constituted of liquid tanks in which liquid is stored on the top of the structure having vibration isolating devices underneath. CONSTITUTION:One or more vibration control devices 5 and 5 constituted of liquid tanks 5a and 5a in which liquid 5b and 5b are stored are arranged on the top 1d of the body 1c of a vibration isolating structure 1 which is so constructed that it has vibration resistance devices 7 and 7 on the foundation 1b thereof. In case of an earthquake and so on, vibrations generated in the body 1c through the vibration isolating devices 7 and 7 are absorbed and reduced by the vibration control devices 5 and 5.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Denominator The present invention relates to a seismic isolation structure capable of preventing the shaking of a building body during an earthquake or the like.

(b), Prior Art Recently, many proposals have been made to elastically support buildings to the foundation using elastic means such as laminated rubber to eliminate the effects of horizontal shaking that occurs during earthquakes and the like.

(C) Problem that the invention aims to solve In such a case,
Horizontal vibrations induced in the building body by elastic means must be damped by some kind of damping means. but,
Since such damping means usually have a mechanical structure, it is often difficult to maintain the initial function due to fluctuations over time, such as rust and deterioration of various parts, and of course, maintenance requires a lot of effort. And it costs money.

In order to eliminate the above-mentioned drawbacks, the present invention provides a seismic isolation structure that has reliability over time and can be easily maintained and inspected without using a complicated 8i castle structure. The purpose is to

(d) Means for solving the first problem, that is, the present invention provides at least one liquid tank (5a) in which a liquid (5b) such as water is stored in the upper part of the structure body (1c). The vibration damping device (5) is provided.

Note that the numbers in parentheses are for convenience and indicate corresponding elements in the drawings, and therefore, this description is not limited to the descriptions in the drawings. The same applies to the column of "master) 0 action" below.

(e) Zero effect With the above-described configuration, the present invention acts so that vibrations generated in the main body (1c) via the seismic isolation device (7) are attenuated by the vibration damping device (5).

(f), Example Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a diagram showing an embodiment of a seismic isolation structure according to the present invention, FIG. 2 is a perspective view showing an example of the arrangement of a vibration damping device, and FIG. 3 is a plan view showing an example of a vibration damping device. FIG. 4 is a front sectional view of the vibration damping device shown in FIG. 3, and FIG. 5 is a plan view showing another example of the vibration damping device.
6 is a front sectional view of the vibration damping device shown in FIG. 5, FIG. 7 is a plan view showing still another example of the vibration damping device, and FIG. 9 is a perspective view showing another example of the arrangement of the vibration damping device, FIG. 10 is a plan view of FIG. 9, FIG. 11 is a plan view showing yet another example of the arrangement of the vibration damping device, and FIG. FIG. 13 is a plan view showing yet another example of the arrangement of the vibration damping device; FIG. 14 is a plan view showing yet another example of the arrangement of the vibration damping device; FIG. 15 is a front sectional view showing still another example of the vibration damping device.

As shown in Figure 1, the high-rise building that is the seismic isolation structure 1 is
It has a main body 1c that is supported to be elastically movable to some extent in the horizontal direction via a known seismic isolation device 7 such as a laminated gong on a foundation 1b provided on the ground 2, and the top part 1 of the main body 1c
A vibration damping device 5 is installed at d. As shown in FIG. 2, two vibration damping devices 5 are installed so as to cross each other at right angles, and each vibration damping device 5 has a lid on the top, as shown in FIGS. 3 and 4. The liquid tank 5a has a rectangular planar shape and is provided with 5g of liquid. Each liquid tank 5a is injected with water or a liquid 5b having a viscosity equal to or higher than that of water, and the injected liquid 5b causes the liquid tank 5a to flow as shown in FIG. The wave water surface 5f on which the liquid 5b oscillates is formed into a flat rectangular shape. Furthermore, meshes 5c as damping members made of stainless steel, vinylon, high-performance fibers, etc. are installed on both left and right sides of the liquid tank 5a in FIG. 3 in the upper and lower two stages in FIG. In addition, 5 g of the lid body is attached to the upper part of the liquid tank 5a.
A wave dissipating device 5h15h is provided on both sides of the t.
It is composed of a porous member.

Since the seismic isolation structure 1 has the above-mentioned configuration, when the ground 2 shakes horizontally due to an earthquake or the like, the main body 1c is also separated from the ground 2 via the seismic isolation device 7 of the foundation 1b. This prevents an excessive seismic force from acting on the main body 1c. Also, the main body 1c
When the vibration damping device 5 installed on the top portion 1d also swings in the horizontal direction. Then, the liquid 5b in the vibration damping device 5 swings in the longitudinal direction WD of the wave water surface 5f in synchronization with the vibration of the main body IC, as shown in FIGS. 3 and 4. That is, the oscillation period of the liquid 5b (the oscillation period of the wR body 5b is determined by the length Ll in the long side direction of the liquid tank 5a and the liquid height L3 of the liquid 5b in a stationary state, as shown in FIGS. 3 and 4). By matching the first natural vibration period of the main body IC of the base isolation structure 1 (determined by absorb. 1 night body 5b
When the liquid 5b swings, as shown by the arrow AR, the liquid 5b passes through the mesh 5c installed in the liquid tank 5a in the vertical direction in FIG.
The viscous resistance that acts between the liquid 5b and the mesh 5c acts in a direction that restricts the movement of the liquid 5b. As a result, the vibration of the liquid 5b is attenuated, and the ability to absorb vibration energy is improved.

When the vibration of the main body IC exceeds a predetermined value, the wave height of the liquid 5b in the vibration damping device 5 also increases, and as shown in FIG. become. However, if the crest 5j of the wave directly hits the lid 5g and bounces back, the period of the liquid 5b is disturbed, making it impossible to exhibit an appropriate damping effect. However, wave breakers 5h, 5h are installed on both sides of the liquid tank 5a in the wave direction where the crest 5j of the wave 51 occurs, and when the waves 51 hit the wave breakers 5h, the waves 51 are The energy flows in a distributed manner into the many pores of the porous member, and its energy is effectively absorbed, so that there are no rebound waves that would disrupt the wave cycle in the tank. Furthermore, it is also possible to prevent the lid 5g from being deformed due to excessive pressure being generated on the lid 5g due to the waves directly hitting the lid 5g. Therefore, the operation of absorbing vibrations by the vibration damping device 5 should be performed smoothly.

In addition, although the above-mentioned embodiment described the case where the mesh 5c was used as a damping member provided in the liquid tank 5a, the damping member may be any material as long as it can damp the vibration of the liquid 5b in the liquid tank 5a. , may be of any form or shape, and may be installed in any manner; for example, mesh x
5c in the liquid tank 5 as shown in FIGS. 5 and 6.
A may be installed in a plurality of sections in the vertical direction as shown in FIG.

Furthermore, as shown in FIG. 15, it is of course possible to provide the mesh: Lsc*ii in an appropriate combination in the vertical and horizontal directions of the body tank 5a.

In addition, it is not limited to mesh 5C, for example, Figs.
As shown in the figure, in the liquid tank 5a, the wave direction of the liquid 5b,
That is, partition walls 5d are provided in a manner that separates them in the left and right direction in the figure (the waving water surface 5f is divided into a plurality of parts), and projections 5e are provided on the partition walls 5d.
A large number of viscous resistances are provided in a shape that matches the swinging form of the liquid 5b (for example, as shown in FIG. Of course, it is also possible to damp the vibrations of the liquid 5b by using the damping member.Furthermore, it is also possible to install a material in the form of steel chips, a plastic molded product, or the like as a damping member in the liquid tank 5a.

Also, the manner in which the damping bag W5 is arranged can be appropriately selected depending on the location and the required damping performance. That is,
Since the wave motion of the liquid 5b occurs in the longitudinal direction of each vibration damping device 5, the longitudinal direction WD of the wave water surface 5r of each vibration damping device 5 should be installed so as to face at least two horizontal directions of the main body IC where vibrations are to be absorbed. As a result, the shaking acts on each vibration damping device 5 in a form that is separated into at least two directions, and a large vibration damping effect can be exerted. For example, as shown in FIGS. 9 and 10, a plurality of damping devices 5 are arranged horizontally so that the longitudinal direction WD, which is the wave forming direction of the wave water surface 5f, is orthogonal to each other.
It is also possible to arrange it so that it faces in the direction. By doing so, it becomes possible to effectively absorb vibrations occurring in the main body IC in two horizontal and right angle directions. Furthermore, as an installation mode of the vibration allocating device 5, as shown in FIGS. In the case of the figure, it is also placed in the center of the main body IC.) In such a case, even if there is existing equipment such as an elevator machine room on the top 1d of the main body IC, 2. It becomes possible to install the vibration damping device 5 without using existing equipment, and it also becomes possible to effectively utilize the building space. Further, in the case of a building body IC having a circular planar shape, a large number of vibration damping devices 5 may be arranged on the circular outer wall 1a, as shown in FIG. Furthermore, as shown in FIG. 13, it is naturally possible to arrange the damping devices 5 radially. Further, by arranging the vibration damping device 5 along the outer wall 1a of the main body IC where the amplitude becomes large, it is possible to significantly enhance the vibration damping effect.

Note that the amount of liquid 5b in liquid tank 5a is 111w.
The weight of free water contributing to IJ is 0 of the weight of the structure body IC.
．． 5-2% (The greater the free water weight, the higher the vibration damping effect)
When the damping constant of the damping member is about 2 to 10%, the damping effect can be exhibited.

Further, in the above embodiment, the wave absorbing device 5h is provided on both sides of the liquid tank 5a in the wave direction WD, but the wave absorbing device 5h is not limited to both sides of the liquid tank 5a, but is also provided on the upper part of the liquid tank 5a. Of course, it is also possible to configure it so that it is provided on the entire surface or the entire side wall.

In addition, the resistance members such as the wave dissipating device 5h and the mesh 50 are
By using an existing elevated water tank or the like and installing it in the water tank, the elevated water tank can be used as the vibration damping device 5, and application to existing structures is also extremely easy.

(g) 1. Effects of the Invention As explained above, according to the present invention, one or more vibration damping devices 5 each consisting of a liquid tank 5a storing a liquid 5b such as water inside the main body 1c are provided in the upper part of the main body 1c. With this structure, it is possible to effectively attenuate vibrations of the structure main body IC generated through the seismic isolation device 7 during an earthquake by swinging the liquid 5b in each vibration damping device 5. Since the vibration damping device 5 has no mechanically movable parts such as the liquid tank 5a and the liquid 5b, it has higher reliability over time than a mechanical vibration damping mechanism. Maintenance and inspection can be easily performed.

In addition, when the wave dissipating device 5h is provided, even if large-amplitude shaking acts and high-height waves occur in the liquid 5b in the tank,
Since the energy is effectively absorbed, there is no disturbance in the period of the liquid 5b, and reliability is high.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of a seismic isolation structure according to the present invention, FIG. 2 is a perspective view showing an example of the arrangement of a vibration damping device, and FIG. 3 is a plan view showing an example of a vibration damping device. FIG. 4 is a front sectional view of the vibration damping device shown in FIG. 3, and FIG. 5 is a plan view showing another example of the vibration damping device.
6 is a front sectional view of the vibration damping device shown in FIG. 5, FIG. 7 is a plan view showing still another example of the vibration damping device, FIG. 8 is a front sectional view of the vibration damping device shown in FIG. 7, and FIG. 10 is a plan view of FIG. 9, FIG. 11 is a plan view showing yet another example of vibration damping device arrangement, and FIG. 13 is a plan view showing yet another arrangement of the vibration damping device; FIG. 14 is a plan view showing yet another arrangement of the vibration damping device; FIG. 15 is a plan view showing yet another arrangement of the vibration damping device; The figure is a front sectional view showing yet another example of the allocation device. 1... Seismic isolation structure 1b... Basic IC... Main body 5... Vibration damping device 5a... Liquid tank 5b...・Liquid 7... Seismic isolation device applicant Mitsui Construction Co., Ltd. agent Patent attorney Phase 1) Shinji (and 2 others) Figure 2 Figure 9 Figure 10 Figure 12 Figure 13

Claims (1)

[Claims] A seismic isolation structure having a foundation and a main body elastically supported on the foundation via a seismic isolation device, comprising: a liquid tank in which liquid is stored inside the main body; A seismic isolation structure consisting of one or more vibration damping devices.