JP2566047B2 - Vibration control device for structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention utilizes vibration of a structure such as a building induced by an earthquake or a strong wind by using movement of liquid in a liquid storage tank installed in the structure. The present invention relates to a vibration damping device that suppresses the vibration.

<< Prior Art >> This type of vibration damping device includes passive vibration damping that uses the moving force when the liquid in the liquid storage tank is shaken in a natural state for damping, and liquid that uses mechanical means. Active damping is known in which the movement of the liquid in the storage tank is forcibly changed.

The former passive vibration suppression is generally used in the past, and the motion cycle of the liquid stored in the liquid storage tank is set in advance so as to substantially match the natural frequency of the structure, and the liquid in the liquid storage tank at the time of vibration input is set. The swinging of the structure can be suppressed by the moving force when swinging in a natural state.

In the latter active vibration suppression, the movement cycle of the liquid in the liquid storage tank can be adjusted in accordance with the vibration cycle of the structure.

Meanwhile, as a vibration damping device that combines the passive vibration damping and the active vibration damping, there is one disclosed in Japanese Patent Application Laid-Open No. 1-214676. In this vibration damping device, a liquid storage tank ( The tank is divided into a plurality of parts by a movable partition plate that is raised and lowered by an actuator.

Therefore, by dividing the inside of the tank through the movable partition plate in this way, the movement cycle of the liquid can be changed stepwise.

<< Problems to be Solved by the Invention >> However, such a conventional vibration damping device has a configuration in which the movable partition plate is driven by an actuator to move up and down in order to change the movement cycle of the liquid in the liquid storage tank. However, since the movable partition plate must partition the entire inside of the liquid storage tank, the movable partition plate becomes considerably large and cannot be moved up and down quickly. It becomes difficult to perform real-time control according to the vibration state of the vehicle, and a large vibration suppression effect cannot be expected.

In addition, as the movable partition plate is enlarged, the actuator for driving the movable partition plate is increased in size, and therefore, the energy required for the lifting and lowering operation of the movable partition plate is also large, and the entire driving device is required. The size is significantly increased.

Furthermore, since the movement cycle of the liquid is changed by dividing the inside of the liquid storage tank with the movable partition plate, the change of the movement cycle at this time is gradual, and the continuous input vibration of the structure There were various problems that precise control was not possible.

Accordingly, the present invention has been made in view of such a conventional problem, to improve the response of the movement cycle of the liquid with a simple device,
Another object of the present invention is to provide a vibration damping device for a structure that enables precise control in accordance with input vibration.

<< Means for Solving the Problems >> In order to achieve the above object, the present invention is to install an upper space portion inside a hermetically sealed structure that is installed horizontally at predetermined intervals at appropriate portions of a structure. A plurality of liquid storage tanks in which the liquid is stored, a liquid communication tube that communicates the respective bottoms of the plurality of liquid storage tanks, and a gas communication tube that communicates the upper space of each of the plurality of liquid storage tanks, The gas communication pipe is provided with an opening / closing control valve for adjusting the opening degree of the gas communication pipe.

<< Operation >> In the structure vibration damping device of the present invention having the above-described configuration, the plurality of liquid storage tanks are communicated with each other through the liquid communication pipes, and therefore, at the time of vibration input, the liquid communication pipes are communicated through the liquid communication pipes. The liquid in each liquid storage tank is moved.

At this time, since the liquid storage tank has an airtight structure, the volume in the upper space portion of the liquid storage tank changes with the inflow and outflow of the liquid, and the pressure change in the upper space at this time changes the gas communication. It is adjusted via the pipe according to the opening degree of the on-off control valve provided therein.

That is, since the opening / closing control valve is fully opened, the gas in the upper space portion is freely exchanged between the liquid storage tanks following the liquid to be moved, so that the pressure in the upper space portion is substantially reduced. It can be held constant.

On the other hand, by keeping the on-off control valve fully closed,
Since the gas is enclosed in the upper space, the pressure in the upper space is raised and lowered by the inflow and outflow of the liquid so as to prevent the movement of the liquid.

Therefore, when the open / close control valve is fully opened, the liquid is freely moved between the liquid storage tanks, so that the moving amount of the liquid passing through the liquid communication pipe is increased and the movement cycle at this time is lengthened.

On the other hand, when the open / close control valve is fully closed, the amount of movement of the liquid decreases due to the pressure sealed in the upper space, and the movement cycle at this time becomes shorter.

Further, the opening / closing control valve can adjust the opening between a fully open state in which the movement cycle is the longest and a fully closed state in which the movement cycle is the shortest. In other words, it can be changed precisely.

Further, since the precise change of the movement cycle of the liquid can be performed by simply adjusting the opening degree of the opening / closing control valve, the responsiveness of the cycle change can be greatly improved.

<Example> Hereinafter, an example of the present invention is described in detail based on a drawing.

FIG. 1 is a structural vibration damping device 10 showing an embodiment of the present invention.
The structure will be described with reference to the case where the building is a multi-storey building 12.

The vibration damping device 10 includes two liquid storage tanks 14 and 16 that are horizontally installed at predetermined intervals on the roof of a building 12.
The liquid storage tanks 14, 16 are hermetically sealed by being closed by lids 14a, 16a.

The upper space portion 14 is provided in the liquid storage tanks 14 and 16.
Water b as a liquid is stored by providing b and 16b.

A liquid communication pipe 18 is provided between the bottoms of the two liquid storage tanks 14 and 16.
Through the liquid communication pipe 18 in this way.
By connecting the base liquid storage tanks 14 and 16 to each other,
A so-called twin tank is configured, and liquid can be moved between the liquid storage tanks 14 and 16.

The liquid communication pipe 18 has a sufficiently large cross-sectional area of the opening in order to reduce the pipe frictional resistance during liquid movement.

The upper spaces 14b and 16b of the two liquid storage tanks 14 and 16 are communicated with each other via a gas communication pipe 20, and a servo valve as an opening / closing control valve is provided in the middle of the gas communication pipe 20. 22 are provided.

The carbovalve 22 has a controller 26 based on a detection signal of a vibration sensor 24 attached to the building 12.
Opening / closing is controlled by a drive signal output from the.

In the vibration damping device 10 of the present embodiment having the above configuration,
As the building 12 is swung due to a vibration input such as an earthquake, the water W in the two liquid storage tanks 14 and 16 is moved between them via the liquid communication pipe 18.

At this time, since the liquid storage tanks 14 and 16 have an airtight structure, the volume in the upper space portions 14b and 16b of the liquid storage tanks 14 and 16 is such that the liquid flows into the respective tanks 14 and 16. It is changed in accordance with the outflow, and at this time, the pressure change in each upper space portion 14b, 16b is adjusted via the gas communication pipe 20 according to the opening degree of the servo valve 22 provided therein. .

That is, when the servo valve 22 is fully opened,
Since the air in the upper spaces 14b, 16b is freely exchanged between the liquid storage tanks 14, 16 following the liquid to be moved, the pressure in the upper spaces 14b, 16b is made substantially constant. Can be held.

Therefore, when the servo valve 22 is fully opened, the pressure in the upper spaces 14b and 16b does not become an obstacle, so that the liquid can freely move between the liquid storage tanks 14 and 16 and the rocking of the building 12 can be performed. Accordingly, the movement amount of the liquid passing through the liquid communication pipe 20 is increased, so that the movement cycle of the liquid at this time becomes long.

On the other hand, when the servo valve 22 is fully closed, gas is enclosed in the upper spaces 14b and 16b, so that the liquid storage tank 1
When liquid flows into 4,16, this upper space 14b, 16
When the pressure in b rises to a positive pressure higher than atmospheric pressure, and when the liquid flows out from the liquid storage tanks 14 and 16, the pressure in the upper space portions 14b and 16b decreases and is lower than atmospheric pressure. It becomes negative pressure.

Therefore, when the servo valve 22 is fully opened, the upper space
Since the positive pressure and the negative pressure enclosed in 14b and 16b serve as springs that prevent the liquid level in the liquid storage tanks 14 and 16 from changing, the amount of movement of the liquid passing through the liquid communication pipe 20 is reduced. The movement cycle of this becomes short.

Therefore, when the rocking cycle of the building 12 becomes long, the rocking of the building 12 can be effectively suppressed by the moving force of the water W having a long motion cycle by opening the servo valve 22, and the rocking of the building 12 can be effectively suppressed. When the rocking cycle becomes short, the motion cycle of the water W can be shortened by closing the servo valve 22 to cope with this.

By the way, the servo valve 22 changes the movement cycle of the water W steplessly by adjusting the opening between a fully opened state where the movement cycle of the water W is the longest and a fully opened state where the movement cycle of the water W is the shortest. Therefore, it is possible to precisely respond to changes in the swing cycle of the building 12.

Further, since the movement cycle of the water W can be changed by simply adjusting the opening degree of the servo valve 22, the responsiveness of the cycle change can be remarkably improved.

Although the vibration damping device 10 of the present embodiment has been described as an example of a twin tank type provided with two liquid storage tanks 14 and 16,
Without limiting to this, three or more liquid storage tanks may be installed, and the arrangement of each liquid storage tank is not limited to a linear arrangement but may be arranged in a polygonal shape.

<< Effects of the Invention >> As described above, in the vibration damping device for a structure according to the present invention, the plurality of liquid storage tanks having the airtight structure are provided with the upper space portions to store the liquids, and the respective liquids are stored. Since the bottom of the storage tank is communicated with the liquid communication pipe, and the opening / closing control valve is provided in the gas communication pipe that communicates each upper space portion,
By adjusting the opening degree of the opening / closing control valve, the movement cycle of the liquid moved between the respective liquid storage tanks can be precisely controlled.

Further, since the movement cycle of the liquid is controlled by simply adjusting the opening / closing of the opening / closing control valve in this manner, its responsiveness is significantly improved, and in combination with the precise control of the movement cycle, the structure is controlled. It has an excellent effect that the vibration effect can be remarkably improved.

[Brief description of drawings]

 FIG. 1 is a schematic configuration diagram of a control device according to the present invention. 10 …… Vibration control device 12 …… Building (structure) 14, 16 …… Liquid storage tank 14b, 16b …… Upper space 18 …… Liquid communication pipe 20 …… Gas communication pipe 22 …… Open / close control valve 24… … Vibration sensor 26 …… Controller

Claims (1)

(57) [Claims] 1. A plurality of liquid storage tanks, which are installed horizontally at appropriate intervals in a structure at predetermined intervals and have an upper space provided inside an airtight structure to store liquid therein, A liquid communication pipe that communicates with each bottom of the liquid storage tank, a gas communication pipe that communicates with the upper space of each of the plurality of liquid storage tanks, and the gas communication pipe is provided with the opening degree of the gas communication pipe. A vibration damping device for a structure, which is provided with an on-off control valve for adjustment.