JP2615225B2 - Vibration isolator for buildings - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an apparatus for vibration damping of a structure, and more particularly, to a device having a relatively high frequency which is disposed on the structure and which is generated by, for example, wind pressure in a strong wind. Automatically adjusts the anti-vibration function according to the frequency so that it has an anti-vibration effect not only for the vibration of the building but also for the vibration of the building with a relatively low frequency of large amplitude caused by a large earthquake The present invention relates to a vibration damping device for a structure.

[Conventional technology]

For example, a high-rise building may shake and vibrate due to wind pressure during a strong wind. It is considered to install a dynamic vibration absorber to prevent such a problem. There are a mechanical type and a liquid type as a dynamic vibration absorber, and both are installed at the top of a building and reduce vibration by a dynamic vibration absorbing action. A vibration damping tank as a liquid dynamic vibration absorber or liquid damper is shown in FIG.

In FIG. 5, an anti-vibration tank 1 is provided on the roof of a building 8 as a high-rise building constructed on a foundation 18. An example of a conventional anti-vibration tank that can be used as the anti-vibration tank 1 is shown in FIG.

In FIG. 3, a liquid 2 is sealed in a U-shaped communicating pipe type anti-vibration tank 1. The liquid 2 has a free liquid level in the left and right vertical liquid tanks, and can reciprocate between the left and right liquid tanks through the communication path. When the structure 8 vibrates, the anti-vibration tank 1 also vibrates integrally with the structure 8, but the vibration of the relative movement of the liquid 2 accompanying the vibration causes an anti-vibration effect.

Air chambers 3 are formed at the upper ends of the left and right vertical liquid tanks, and the left and right free liquid surfaces receive the air pressure in the corresponding air chambers 3 respectively. Each air chamber 3 can receive the supply of compressed air from the air source 10 via a pipe 4 provided with an intake valve 17 on the way, and can also receive a supply of compressed air via a pipe 4 'provided on the way with an exhaust valve 17'. The air in each air chamber 3 can be discharged. Therefore, each exhaust valve 17 'is closed and each intake valve is closed.
When the air valve 17 is opened, the air pressure in each air chamber 3 increases, and when the air intake valves 17 are closed and the exhaust valves 17 'are opened, the air pressure in each air chamber 3 decreases.

The air in each air chamber 3 acts as an air spring for the liquid. When the air pressure in each air chamber 3 rises, the cycle of the reciprocating movement of the liquid 2 becomes shorter and the frequency becomes higher. When the air pressure of the liquid drops, the cycle of the reciprocating movement of the liquid 2 becomes longer and the frequency becomes lower. Therefore, by operating each intake valve 17 and each exhaust valve 17 ′ according to the state of vibration of the building 8, the liquid 2 The vibration of the two reciprocating movements can be synchronized with the vibration of the building 8 to enhance the vibration isolation effect.

[Problems to be solved by the invention]

When installing a dynamic vibration absorber as shown in FIG.
It is necessary to tune the frequency of the dynamic vibration absorber to match the frequency of the structure. However, as shown in Figure 4, the vibration characteristics of the construct, the frequency f ₁ at the time of vibration, such as by wind pressure at the time of strong winds, generally higher than the frequency f ₂ in the case of a large amplitude caused by large earthquakes , therefore, usually during an earthquake for being tuned consider prevention of vibration due to wind pressure of strong winds to a higher frequency f ₁ as the air pressure in the air chamber 3 is P _1, the effect of vibration reduction obtained I can't.

Therefore, a main object of the present invention is to provide an anti-vibration function corresponding to not only the vibration of a structure having a relatively high frequency caused by wind pressure in a strong wind, but also the relatively low frequency of a large amplitude caused by a large earthquake. It is an object of the present invention to provide a vibration isolator for a building that can be automatically adjusted.

[Means for solving the problem]

In order to achieve the above object, in the vibration damping device for a structure of the present invention, the liquid forming the free liquid surface in the left and right vertical liquid tanks reciprocates between the left and right liquid tanks through the communication path. A U-shaped communicating pipe-type anti-vibration tank for a structure, wherein the left and right free liquid surfaces are configured to receive air pressure in an air chamber formed at an upper end portion of each of the left and right vertical liquid tanks. And a vibration detection unit that detects vibrations of the foundation of the building, a calculation processing unit that performs calculation processing based on analysis data of the vibration detected by the vibration detection unit, and a calculation processing that is performed by the calculation processing unit. And an air supply / discharge valve driving device for adjusting the air pressure in the air chamber so as to obtain the optimum air pressure in the air chamber.

[Action]

In the anti-vibration device for a structure of the present invention, when the structure shakes and vibrates, the anti-vibration tank also vibrates integrally with the structure, but the liquid in the anti-vibration tank reciprocates between the liquid tanks relative to the vibration of the structure. Thereby, the vibration of the building is counteracted and the vibration-proof function is achieved.

The free liquid level of the liquid is affected by the air pressure in the air chamber, and the air pressure in the air chamber is adjusted according to the frequency of the structure. The air pressure can be adjusted to accommodate vibrations of the structure due to wind pressure during high winds, which are usually frequent. When an earthquake occurs, the vibration of the foundation of the building is detected by the vibration detection unit, and the arithmetic processing unit calculates based on the analysis data of the detected vibration, and the optimal air pressure in the air chamber is calculated. The calculated optimum air pressure is compared with the actual air pressure, and the air supply / discharge valve driving device is operated so that the actual air pressure in the air chamber becomes the optimum air pressure.

〔Example〕

Hereinafter, a vibration damping device for a building as one embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, the structure of the U-shaped communicating pipe-type anti-vibration tank 1 for a structure provided on the structure 8 constructed on the base portion 18 is basically the same as that of the anti-vibration tank 1 of FIG. , And common portions are denoted by the same reference numerals.

A liquid 2 is sealed in the anti-vibration tank 1 shown in FIG. 1, and the free liquid surfaces in the left and right vertical liquid tanks are in the air chambers 3 formed at the upper ends of the corresponding vertical liquid tanks. Of air pressure. The left and right air chambers 3 can receive the supply of compressed air from the air source 10 via a pipe 4 provided with an electromagnetic valve 5 on the way, and via a pipe 4 'provided with an electromagnetic valve 5' on the way. Thus, the air in each air chamber 3 can be discharged.

When the air discharge solenoid valves 5 ', 5' are closed and the air supply solenoid valves 5, 5 are opened, the air pressure in each air chamber 3 rises and the natural frequency due to the reciprocating movement of the liquid 2 rises. , Each air supply solenoid valve 5,5 is closed, and each air discharge solenoid valve 5 ', 5'
Is opened, the air pressure in each air chamber 3 drops and the liquid 2
, The natural frequency decreases due to the reciprocation. Each solenoid valve 5,5
The operation of 5 'and 5' is controlled by the control device 9.

1 and 2, the anti-vibration tank 1 is usually tuned to cope with the frequent vibration of the building caused by wind pressure. When an earthquake occurs, building 8
The vibration of the base 18 is detected by the vibration detection unit 11 of the control device 9 using the vibration detection end 7 disposed on the base 18 of FIG. The vibration detected by the vibration detection unit 11 is transmitted to the vibration analysis unit 13
The analysis data such as the amplitude and frequency analyzed by the vibration analysis unit 13 is sent to the arithmetic processing unit 14 and subjected to arithmetic processing. The optimum air pressure signal in the air chamber calculated by the calculation in the calculation processing unit 14 is sent to the comparator 19.

On the other hand, an air pressure signal corresponding to the actual air pressure in each air chamber 3 detected by the pressure detection unit 12 of the control device 9 using the pressure detection end 6 disposed in each air chamber 3 is also used as a comparator 19.
Sent to In the comparator 19, the air pressure signal indicating the optimum air pressure sent from the arithmetic processing unit 14 is compared with the air pressure signal indicating the actual air pressure in the air chamber 3, and the resulting air pressure signal is compared with the electromagnetic valve control device 15. The electromagnetic valve control device 15 sends an electromagnetic valve drive signal to the electromagnetic valve drive device 16 for eliminating the air pressure difference. This solenoid valve drive 16
By the operation of the above, each of the solenoid valves 5, 5, 5 ', 5', 5 'is most effective against the vibration of the building 8 due to the earthquake in which the air pressure in each air chamber 3 is detected by the vibration detecting unit 11. Opening / closing operation is performed to achieve the optimum air pressure for exhibiting the vibration isolation effect.

It is well known that, in general, when a large earthquake occurs, initial tremors are observed in the foundation 18 (ground) of the building immediately before it. Therefore, if the initial tremor is observed in advance at the vibration detection end 7 and the tuning of the anti-vibration tank is performed promptly in response to the building frequency at the time of large amplitude due to the large earthquake, the anti-vibration effect can be obtained even for a large earthquake. Can be
After the earthquake, the dynamic vibration absorber is tuned again so as to correspond to the frequency of the vibration of the building 8 due to the wind pressure. In this way, by automatically tuning the frequency of the dynamic vibration absorber to a required frequency, an accurate vibration control action can always be obtained.

In FIG. 2, the air pressure in the air chamber 3 may be constantly detected by the pressure detection unit 12 and a detection signal of the air pressure may be fed back to the solenoid valve control device 15.

In addition, the air pressure in the air chamber 3 is set in advance in a plurality of stages, the state of vibration of the building 8 is determined, and an optimal set air pressure is selected from the preset air pressures in the plurality of stages. The control device 9 may be configured.

〔The invention's effect〕

As described above in detail, the following effects or advantages can be obtained by the structure vibration damping device of the present invention.

(1) Since a U-shaped communicating pipe type anti-vibration tank is used,
With a simple configuration, the vibration of the building can be effectively damped by utilizing the reciprocating movement of the liquid.

(2) In the U-shaped communicating pipe type vibration isolating tank, the free liquid surfaces in the left and right liquid tanks are configured to receive the air pressure of the air chamber formed at the upper end of each vertical liquid tank. By adjusting the air pressure in the air chamber, the natural frequency of the liquid can be changed, and it is easy to adjust the anti-vibration function according to the state of vibration of the building.

(3) Since a vibration detecting unit for detecting the vibration of the foundation of the building is provided, early vibration can be detected early in the event of an earthquake, and the vibration isolating tank can be quickly tuned.

(4) an arithmetic processing unit that performs an arithmetic process based on the analysis data of the vibration detected by the vibration detection unit to calculate an optimal air pressure in the air chamber; Since it has an air supply / exhaust valve driving device that adjusts air pressure, not only the vibration of a small-amplitude relatively high-frequency building caused by wind pressure but also a large-amplitude relatively low-frequency building caused by a large earthquake The vibration control function can be automatically adjusted corresponding to each vibration frequency.

[Brief description of the drawings]

FIG. 1 is an overall explanatory view of an anti-vibration device for a building as one embodiment of the present invention, FIG. 2 is a signal path diagram of a control device in the anti-vibration device for a building, and FIG. FIG. 4 is a cross-sectional view showing an example, FIG. 4 is a graph showing the relationship between the vibration frequency in the U-shaped communicating pipe type vibration isolating tank and the optimum air pressure in the air chamber, and FIG. 5 exemplifies the installation position of the vibration isolating tank in the building. It is a front view. 1 ... vibration isolation tank, 2 ... liquid, 3 ... air chamber, 4, 4 '... pipe, 5 ... air supply solenoid valve, 5' ... air discharge solenoid valve,
6: Pressure detection end, 7: Vibration detection end, 8: Construction, 9: Control device, 10: Air source, 11: Vibration detection unit, 12: Pressure detection unit, 13: Frequency control unit, 14: Operation processing unit, 15 ... solenoid valve control device, 16 ... solenoid valve drive device, 17 ... intake valve, 17 '... exhaust valve, 18 ... foundation of building, 19 ... comparator.

Claims (1)

(57) [Claims] A liquid forming a free liquid surface in left and right vertical liquid tanks can reciprocate between the left and right liquid tanks through a communication path, and the left and right free liquid surfaces are respectively A U-shaped communicating pipe type anti-vibration tank for a structure configured to receive air pressure in an air chamber formed at an upper end portion of the left and right vertical liquid tanks, and vibration for detecting vibration of a foundation of the structure. A detection unit, a calculation processing unit that performs calculation processing based on the analysis data of the vibration detected by the vibration detection unit, and an air control unit that calculates the optimum air pressure in the air chamber by the calculation in the calculation processing unit. An anti-vibration device for a building, comprising an air supply / exhaust valve driving device for adjusting the air pressure in a room.