JPH11159192A - Water tank used for damping load mass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water tank used for damping load mass for controlling a sloshing phenomenon. SOLUTION: Beside a general water supply elevated water tank 2, and an elevated water tank 10 always filled with water 11 is mounted on the roof of a structure 1 to use it both as damping load mass an emergency water tank. Since it is always filled with water, no sloshing phenomenon occurs in the surface of the water even by vibration occurring in the case of an earthquake. Accordingly, the effect of vibration control as designed can be obtained in the case an earthquake occurs and, at the same time, since there is no damage in the water tank by sloshing phenomenon, it can surely cope with water shortage after an earthquake.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damping load / mass tank which uses an elevated water tank for water supply installed on the roof of a structure as a load mass of a vibration damping device.

[0002]

2. Description of the Related Art A vibration damping device referred to herein is a rooftop of a building or an interior corresponding thereto (hereinafter referred to as a rooftop) in order to control or suppress the vibration response of the building against vibrations generated in the building by an earthquake or wind. Unit). Such vibration damping devices are roughly classified into a passive type, that is, a passive type, and an active type, that is, an active type. The former is a method to suppress the resonance vibration by adding damping means whose spring characteristics and damping are adjusted in advance to the building, and controls the damping of the system. Adjustment methods (various dampers, joint dampers, etc.), methods for controlling and adjusting the mass of the system (mass pumps, dynamic dampers, etc.), and methods for controlling and adjusting the vibration input of the system (seismic wave blocking, laminated rubber, etc.) is there. The latter detects disturbances and building vibrations with sensors,
This method uses the signal as a control signal for vibration suppression and actively reduces the vibration response of the building by giving a control force from the outside. There is a variable stiffness mechanism that adjusts the stiffness of the brace, wall, etc. of the building so that the driver and vibration response are minimized.

[0003] Fig. 2 shows one type of conventionally known vibration damping device, which is a water supply tank 2 generally installed on the roof of a structure 1 such as a building, an apartment, or a tower.
Is supported by a horizontal rigid member 12 made of laminated rubber, a spring, or the like, and is used as a load mass of a dynamic damper which is a passive type vibration damping device. When an earthquake occurs, the water tank 2 as a weight is vibrated by the horizontal rigid member 12 and absorbs the vibration energy of the entire structure 1 to reduce the vibration of the structure 1.

[0004]

However, in such a conventional rooftop-type water supply water tank, a so-called rooftop tank, the water 3 in the water tank 2 is constantly consumed and the water level drops to a predetermined level. A gap 4 exists between the upper part of the water tank, that is, the lid and the water surface, because the water is used while being pumped and supplied. for that reason,
When the structure 1 shakes due to an earthquake or the like, the water 3 in the water tank 2 resonates, causing a sloshing phenomenon (water waving phenomenon) in which the water surface fluctuates, and there is a problem that a sufficient damping effect cannot be obtained.

[0005] In addition, a roof-mounted water supply tank is provided with FRP.
Although there are many water tanks and strong earthquake resistance, even if the water pressure of the water flow that jumped up due to the sloshing phenomenon is concentrated on a part of the upper lid, the upper lid may be destroyed, or at worst, the water tank may be totally damaged. I could invite you. In that case, there will be a serious problem of obtaining support for domestic water (drinking water and toilet drainage) in the event of an earthquake disaster.

The present invention has been made in view of the problem of the conventional vibration damping load mass / water tank using such a general water supply elevated water tank as the load mass of the vibration damping device. It is an object of the present invention to provide a vibration suppression load / mass tank that suppresses the vibration.

[0007]

In order to achieve the above-mentioned object, the present invention relates to a vibration-damping load-mass / water tank which, apart from a general water-supply elevated water tank, comprises an elevated water tank which is always filled with water. It is installed on the rooftop.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram in which a water tank 10 for both a vibration damping load and a mass of the present invention, which is a vibration damping device, is installed on the roof of a structure 1 separately from a general elevated water tank 2 for supplying water.
The damping load mass / water tank 10 is an emergency water tank that also serves as a passive vibration damping device, and has a size and weight adjusted in advance to have a cycle substantially equal to the primary natural vibration cycle of the structure 1. The water is always full so that the sloshing phenomenon does not occur. The above-mentioned water tank 10 for vibration suppression load and mass functioning as an additional mass to the structure 1
Is a horizontal rigid member 12 made of, for example, laminated rubber, a spring, or the like.
Is fixedly supported on the rooftop.

Water for daily living in the structure 1 is supplied only from the elevated water tank 2 for water supply, and the water in the vibration suppression load / mass tank 10 which is an emergency water tank is not used. When vibration occurs due to the earthquake, the vibration suppression load / mass tank 10 vibrates in the horizontal direction in response to the shaking by the horizontal rigid member 12, and resonates with the vibration response of the structure 1 to absorb vibration energy. The swing of the structure 1 is suppressed. During the vibration, the water in the damping load mass / water tank 10 remains full, and the sloshing phenomenon does not occur, so that the added mass does not fluctuate and a sufficient damping effect as designed can be exhibited. Also, there is no risk of damage to the water tank.

Thus, not only can the vibration during the earthquake be effectively suppressed by the vibration suppression / mass tank 10, but also the vibration suppression mass / water tank 10 can be used as an emergency water tank even if the water supply is interrupted by the earthquake. By functioning, the water shortage after the earthquake is alleviated.

In the example of the above embodiment, the case where the passive type vibration damping device of the present invention is installed on the roof has been described. However, the present invention is not limited to this. It is also possible to use it as an additional mass of an active type vibration damping device.

Further, the structure is not necessarily limited to the roof, and depending on the form of the structure, it may be installed in a room close to the roof or the like (in the roof).

[0013]

As described above, since the water tank for both the damping load and the mass of the present invention is always full, the sloshing phenomenon does not occur. And the vibration response of the building can be sufficiently controlled or suppressed.

Further, in addition to the above effects, it is possible to prevent the water tank from being damaged due to the sloshing phenomenon, and it is possible to obtain an effect that the water tank can be reliably used as emergency water in the event of an earthquake.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing one embodiment of the present invention.

FIG. 2 is a schematic view showing an example of a conventional water tank for both vibration suppression load and mass.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Structure 2 (General) Elevated water tank for water supply 3 Water 10 Water tank (of the present invention) combined with vibration suppression load mass 11 Full water 12 Horizontal rigid member

Claims (1)

[Claims] 1. Apart from a general elevated water tank for water supply,
An aquarium with an elevated water tank full of water installed on the rooftop of the structure.