JP2530525B2 - Vibration control equipment for building structures - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration suppressing device installed in a building structure in order to suppress vibration excited by an external force such as an earthquake or wind.

[0002]

2. Description of the Related Art In recent years, building structures have become higher in height and are designed to have a structure that is flexible against external forces, so that they tend to vibrate against wind and earthquakes. Suppress this shaking,
Various vibration suppression devices have been proposed in order to improve the habitability of a building structure.

In Japanese Patent Laid-Open No. 62-101764, a flat-bottom short cylindrical tank is installed at a predetermined position of a building structure, and has the same vibration period as the natural vibration period of the building structure and the building structure. Disclosed is a vibration suppressing device in which a liquid vibrating with a natural phase of an object and a required phase difference is stored in a tank.

This type of vibration suppressor utilizing the vibration of the liquid suppresses the vibration of the building structure by vibrating the liquid in the tank at the same cycle as the building structure and with a required phase difference. Therefore, when the vibration of the building structure is suppressed by the action of the vibration suppressor, if the vibration of the liquid is not damped to a certain level, the vibration suppressor itself acts as an exciter on the contrary. It will be.

The liquid in the tank causes friction with the wall surface of the tank,
The vibration is damped by collision or the viscous resistance of the liquid itself to consume the vibration energy. However, since water is generally used as the liquid, the vibration damping due to the viscosity of the liquid is small. Further, since the tank is formed in a flat bottomed short cylinder shape with no unevenness on the inner wall surface, there is a certain limit to vibration damping due to friction with the tank wall surface.

As a measure for ensuring and adjusting the damping rate of the vibration of the liquid in the tank to a predetermined level, a protrusion is attached to the tank wall surface, and the vibration is damped by the pressure loss when the liquid hits the protrusion and receives resistance. A vibration suppressing device which is configured to perform is disclosed in Japanese Patent Laid-Open No. 63-40064, in which a mesh member is projected from a bottom wall of a tank, and a vibration loss is caused by a pressure loss when a liquid passes through a gap between the mesh members. A vibration suppressing device for performing damping is disclosed in Japanese Patent Laid-Open No. 1-111
It is disclosed in Japanese Patent No. 31763.

Further, a vibration suppressing device is provided, in which a flexible buoyant rod-shaped body is planted on the bottom wall of the tank, and vibration energy is consumed for bending movement of the rod-shaped body to attenuate the vibration. It is disclosed in Kaihei 1-131769 gazette, and floating particles such as polypropylene are sprinkled and suspended on the liquid surface in the tank, and the vibration energy is consumed by collision between particles, friction, and friction between particles and liquid,
A vibration suppressing device that attenuates vibration has also been proposed (Abstracts of Scientific Lectures of the Architectural Institute of Japan (China), October 1990).

However, providing a protrusion on the inner wall of the tank or implanting a mesh member or a rod-shaped member on the bottom wall of the tank has a dampening effect on the vibration of the liquid.
Not only is the labor and cost of manufacturing and processing the tank increased, but also the behavior of the liquid during vibration becomes complicated, which makes it difficult to analyze the liquid suppression effect on the vibration of the building structure. Dispersal of floating particles and the like has a similar problem.

On the other hand, Japanese Unexamined Patent Publication No. 1-131768 discloses a vibration suppressing device in which the damping rate of vibration of liquid is increased by devising the shape of the tank itself.
In this vibration suppression device, the plurality of concentrically arranged tanks are formed in an annular shape, and the depth of the liquid stored in each tank becomes shallower from the outer tank to the inner tank. It is adjusted to a predetermined depth.

When the liquid vibrates, the liquid moves circumferentially along the side wall of each tank. The vibration energy is not only consumed by friction and collision with the side wall of the tank like the flat bottom short cylindrical tank, but also liquid coming from one circumferential direction collides with liquid coming from the other circumferential direction. It is also consumed by things. Therefore, vibration damping of the liquid is fast.

However, in this vibration suppressing device, the plurality of tanks are constructed completely independently of each other, and the liquid is separately injected into the tank, so that the liquid storage amount is adjusted to a predetermined depth. , The depth of the liquid must be measured many times during the injection, and if it is insufficient, the required amount of liquid must be added, and if it is excessive, the required amount of liquid must be withdrawn. It cannot be done smoothly and efficiently.

Since the plurality of annular tanks are different from each other in diameter and a molding die for one tank cannot be used for molding another tank, a plurality of dies are prepared separately and independently. Therefore, the cost burden of the manufacturing equipment increases. Further, in order to obtain a combination of one set of annular tanks, it is necessary to repeat a plurality of molding operations using a plurality of types of molds, which complicates the manufacturing process and increases the cost.

[0013]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to easily increase the damping rate of liquid vibration,
Moreover, proper injection of the liquid into the tank can be easily and smoothly performed, and all the constituent parts of the tank can be simultaneously molded by the blow molding method using one kind of mold by selection.
An object is to provide a vibration suppressing device for a building structure.

[0014]

The vibration suppressing device according to the first aspect of the present invention will be described below with reference to the reference numerals in the accompanying drawings. The tank 2 is installed at a predetermined position of the building structure 1.
Is divided into a plurality of annular storage chambers 7 by the inner side wall 4, the outer side wall 5, and the partition wall 6 arranged on a concentric circle centered on the vertical axis of the tank 2. The bottom wall 8 of each storage chamber 7 is set to a predetermined height such that the bottom wall 8 becomes higher from the outer storage chamber to the inner storage chamber, and the injection port 1 for the liquid 3 is supplied to one of the storage chambers 7.
1 is provided, and the communication openings 9 are provided in each partition wall 6 at the same height.

In the vibration suppressing device according to the second aspect of the invention, the tank 2 installed at a predetermined position of the building structure 1 is arranged in a concentric circle centered on the vertical axis of the tank 2, an inner wall 4, an outer wall 5 and The partition wall 6 divides into a plurality of annular storage chambers 7. The bottom wall 8 of each storage chamber 7 is set to a predetermined height so as to be higher from the outer storage chamber to the inner storage chamber, and one of the storage chambers 7 is provided with an inlet 11 for the liquid 3, Wall 8
A communication opening 9 is provided at the lowermost portion of the partition wall 6 close to.

The difference between the heights of the bottom walls 8 of the storage chambers 7 is that the liquid 3 stored in the storage chambers 7 has the same vibration period as the natural vibration period of the building structure 1. Considering the inner diameter and outer diameter of each storage chamber 7 and the height of the communication opening 9 so as to vibrate in the same behavior with a required phase difference, a predetermined calculation formula based on a known velocity potential theory or Hausner theory is used. It is determined.

[0017]

In the first aspect of the invention, the liquid 3 is injected into each storage chamber 7 of the tank 2 through the injection port 11 provided in any one specific storage chamber 7. The liquid 3 injected into the specific storage chamber 7 flows into the adjacent storage chamber 7 from the communication opening 9 when the injection proceeds to the communication opening 9 of the partition wall 6 and is injected into the storage chamber 7. Thereafter, similarly, the injection into the adjacent storage chambers 7 is sequentially started, and when the liquid level of the liquid 3 in each storage chamber 7 is brought to the same level at the communication opening 9, the injection of the liquid 3 ends. .

In the second aspect of the invention, the liquid 3 is injected into each storage chamber 7 of the tank 2 through the injection port 11 provided in any one specific storage chamber 7. For example, when the storage chamber 7 provided with the injection port 11 is the outermost storage chamber 7, when the injection into the outer storage chamber 7 progresses and the liquid level reaches the communication opening 9, the liquid 3 The fluid flows from the communication opening 9 into the adjacent storage chamber 7 on the inner side, and the injection into the outermost storage chamber 7 and the injection into the adjacent storage chamber 7 are performed in parallel.

When the liquid is injected into the adjacent storage chamber 7 and the liquid level reaches the communication opening 9 at a higher position, the liquid 3
Flows into the adjacent storage chamber located further inside from the communication opening 9 and is injected into the outermost storage chamber 7 and adjacent to the inside.
Injection into one storage chamber 7 is performed in parallel. Hereinafter, similarly, the injection of the liquid 3 is sequentially started to the innermost storage chamber 7 through the lowermost communication opening 9 of the partition wall 6, and when the liquid level of the liquid 3 in each storage chamber 7 reaches a required level. Liquid 3
Injection is completed.

When the building structure 1 vibrates due to an external force such as an earthquake or wind, the liquid 3 in the tank 2 moves in the circumferential direction along the side wall of each storage chamber 7. The vibration energy is consumed by friction and collision with the side wall of the storage chamber 7, and is also consumed when the liquid 3 coming from one circumferential direction collides with the liquid 3 coming from another circumferential direction. . As a result, the vibration of the liquid 3 is quickly damped.

[0021]

In the illustrated embodiment, the storage chambers 7 in three rows inside and outside of the tank 2 and the hollow disk portion 18 in the central portion are integrally formed of plastic by a blow molding method. Each storage chamber 7
The abdominal surfaces on one side or both sides are slightly bulged at a portion slightly above the midpoint to form a hollow ring body having a substantially rectangular vertical cross section, and the hollow ring bodies are connected to each other at the tips of the bulged portions. Therefore, the partition wall 6 has a vertically long X-shaped cross section. The communication openings 9 are provided in the X-shaped cross connection portion, and a plurality of communication openings 9 are provided discontinuously at equal angular intervals on the same circumference.

When a plurality of communication openings 9 are provided in this way, the liquid 3 is quickly injected into each storage chamber 7.
The number of the communication openings 9 provided discontinuously can be appropriately increased or decreased to a minimum of 1 in consideration of the structural strength of the partition wall 6, and the opening area thereof can be expanded or reduced.
Further, depending on the structural strength of each storage chamber 7, the communication opening 9 may be continuously formed over the entire circumference of the partition wall 6.

The partition wall 6 may be provided with a vertical wall portion having a certain length, and the vertical wall portion may be provided with the communication openings 9 in a plurality of rows or a plurality of rows by changing the height position. In this case, if the natural vibration period of the building structure 1 becomes long after the tank 2 is installed, the liquid 3 is injected up to the communication opening 9 on the lower side, so that the vibration period of the liquid 3 becomes longer. On the other hand, when the natural vibration period of the building structure 1 is shortened, the vibration period of the liquid 3 can be set short by injecting the liquid 3 up to the communication opening 9 on the upper side. That is, the vibration cycle of the liquid 3 can be adjusted within a certain range in accordance with the fluctuation of the natural vibration cycle of the building structure 1.

In the present embodiment, the storage chamber 7 outside the tank 2
The top wall 10, the top wall 10 of the inner storage chamber 7, and the top wall 10 of the intermediate storage chamber 7 are aligned on the same plane. Tank 2
Are arranged in three rows and arranged in a plurality of rows in the vertical and horizontal directions on the roof of the building structure 1. Water is used as the liquid 3. The injection port 11 for the liquid 3 is provided on the upper side surface of the outer storage chamber 7, and is sealed after the injection of the liquid 3 in order to prevent evaporation of the liquid 3 and leakage during vibration.

As the injection of the liquid 3 progresses, the air in the storage chamber 7 pushed by the liquid 3 is supplied to the injection hose and the injection port 11.
Escape into the atmosphere through the gap. In this embodiment, an air escape port 16 is provided in each storage chamber 7 in order to facilitate the escape of air and promote the injection of the liquid 3. This air escape port 1
6 is provided on the upper side surface of the partition wall 6, the inner side wall, and the outer side wall 6 so as not to hinder the stacking of the tanks 2. Regarding the storage chamber 7 provided with the inlet 11, since a part of the inlet 11 functions as an air escape portion as described above, it is possible to omit providing the air escape port 16 separately.

In both the first invention in which the communication opening 9 is provided in the middle of the partition wall 6 and the second invention in which the communication opening 9 is provided at the lowermost portion of the partition wall 6, the inlet 11 for the liquid 3 is located outside, inside or in the middle. 7 may be provided, and it may be provided not on the side surface but on the top wall so as not to hinder the stacking of the tanks 2. In order to prevent the liquid 3 from evaporating, the air escape port 16 is sealed in the same manner as the injection port 11 when the predetermined injection of the liquid 3 is completed.

When the natural vibration cycle of the building structure 1 fluctuates, the vibration cycle of the liquid may be adjusted by increasing or decreasing the storage amount of the liquid 3 in the tank 2 as needed. When it is necessary to increase the amount of the liquid 3, in both the first invention and the second invention, the sealing of the injection port 11 is opened and the liquid 3 is added to each storage chamber 7 by a required amount. When it is necessary to reduce the amount of the liquid 3, in the second aspect of the invention, the liquid outlet 17 provided in the lower portion of the side surface of the outermost storage chamber 7 is opened to extract the excess liquid 3 from each storage chamber 7. In the illustrated vibration suppressing device of the first invention, the liquid outlet 17
The liquid 3 is extracted only from the outermost storage chamber 7 because the liquid crystal 3 is provided only at the lower part of the side surface of the outermost storage chamber 7. When draining the liquid 3 also from the middle or inner storage chamber 7, a liquid outlet is provided in the lower side surface or the bottom wall of the middle or inner storage chamber 7 to eliminate the hollow disk portion 18 at the center and remove the liquid. There is a method in which the mouth can be operated from the central upper surface side of the tank 2. Further, when the tanks 2 are stacked and used as shown in the figure, the liquid draining port cannot be opened / closed from the upper surface side except for the uppermost tank, so that the liquid draining of each of the middle and inner storage chambers is not possible. Connect the inner end of the flow tube to the mouth,
By passing the liquid passage pipe through the recess formed in the bottom wall surface of the outermost storage chamber and providing a plug at the outer end of the liquid passage pipe, the liquid can be extracted from all the storage chambers.

On the top wall 10 and the bottom wall 8 of the outer storage chamber 7,
Positioning projection 12 and recess 13 when stacking the tanks 2
Is provided. A reinforcing rib 14 is provided between the lower side surface of the outer storage chamber 7 and the bottom wall 8 of the middle storage chamber 7,
A reinforcing rib 15 is provided between the lower side surface of the middle storage chamber 7 and the bottom wall 8 of the inner storage chamber 7. A floating substance can be added to the storage chamber 7 of the tank 2 as a vibration damping means.

[0029]

As described above, in the vibration suppressing device of the first invention and the second invention, the inner wall 4 and the outer wall 5 arranged concentrically.
And the partition wall 6 divides the tank 2 into a plurality of annular storage chambers 7.
When the liquid 3 vibrates in the tank 2,
After the liquid 3 in each storage chamber 7 moves in the circumferential direction and the liquid 3 repeats self-collision from two opposite directions, the damping rate of the vibration of the liquid 3 increases and after the external force such as an earthquake or wind disappears. Since the shaking of the building structure 1 ends early, the habitability of the building structure 1 is improved.

Further, the bottom wall 8 of each storage chamber 7 is set to a predetermined height so as to increase from the outer storage chamber to the inner storage chamber, and the communication openings 9 are formed at the same height in each partition wall 6. Or the communication opening 9 is provided at the lowermost part of the partition wall 6 adjacent to the bottom wall 8, so that the injection port 11 provided in any one of the storage chambers 7 is provided.
The liquid 3 injected from the above flows into each of the storage chambers 7 through the communication openings 9 so that the liquid surface is leveled to the same level, and an appropriate amount of the liquid 3 is injected into each of the storage chambers 7 temporarily and smoothly. .

Since the plurality of annular storage chambers 7 are continuous by the communication openings 9, if necessary, all the constituent parts of the tank 2 are simultaneously molded by the blow molding method using one type of mold. Therefore, the manufacturing cost of the tank 2 can be reduced.

Further, in the second aspect of the invention, since each communication opening 9 is located at the lowest part of the partition wall 6, the liquid level in each storage chamber 7 can be changed within a certain range. Therefore, tank 2
When the natural vibration period of the building structure 1 becomes long after installation, the liquid level is lowered to set the vibration cycle of the liquid 3 longer, while when the natural vibration period of the building structure 1 becomes shorter, By increasing the liquid level, the vibration cycle of the liquid 3 can be set shorter.
That is, the vibration cycle of the liquid 3 can be adjusted within a certain range in accordance with the fluctuation of the natural vibration cycle of the building structure 1.

[Brief description of drawings]

FIG. 1 is a schematic front view of a building structure in which a vibration suppressing device according to an embodiment of the present invention is installed.

FIG. 2 is a schematic plan view of the building structure.

FIG. 3 is an enlarged view of a portion A of FIG.

FIG. 4 is a plan view of the vibration suppressing device.

FIG. 5 is a vertical cross-sectional view of the vibration suppressing device.

FIG. 6 is a vertical cross-sectional view of a vibration suppressing device according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Building structure 2 Tank 3 Liquid 4 Inner side wall 5 Outer side wall 6 Partition wall 7 Storage chamber 8 Bottom wall 9 Communication opening 10 Top wall 11 Injection port 12 Positioning protrusion 13 Positioning recess 14 Reinforcing rib 15 Reinforcing rib 16 Air escape port 17 Liquid outlet 18 Hollow disk

Claims (2)

(57) [Claims] 1. A tank 2 installed at a predetermined position of a building structure 1, and a building structure 1 which is stored inside the tank 2.
Of the liquid 3 that vibrates with the same vibration period as the natural vibration period of the building structure 1 and with the required phase difference from the natural vibration of the building structure 1, and is excited in the building structure 1 by an external force such as an earthquake or wind. A vibration suppressing device for suppressing the vibration of the tank 2, the inner wall 4, the outer wall 5 and the partition wall 6 arranged concentrically around the vertical axis of the tank 2 to divide the tank 2 into a plurality of annular storage chambers 7. It is divided and the bottom wall 8 of each storage chamber 7 is set to a predetermined height so as to be higher from the outer storage chamber to the inner storage chamber, and the injection port 1 for the liquid 3 is placed in one of the storage chambers 7.
1 is provided, and the communication openings 9 are provided in each partition wall 6 at the same height. 2. A tank 2 installed at a predetermined position of the building structure 1, and a building structure 1 which is stored inside the tank 2.
Of the liquid 3 that vibrates with the same vibration period as the natural vibration period of the building structure 1 and with the required phase difference from the natural vibration of the building structure 1, and is excited in the building structure 1 by an external force such as an earthquake or wind. A vibration suppressing device for suppressing the vibration of the tank 2, the inner wall 4, the outer wall 5 and the partition wall 6 arranged concentrically around the vertical axis of the tank 2 to divide the tank 2 into a plurality of annular storage chambers 7. It is divided and the bottom wall 8 of each storage chamber 7 is set to a predetermined height so as to be higher from the outer storage chamber to the inner storage chamber, and the injection port 1 for the liquid 3 is placed in one of the storage chambers 7.
1 is provided, and a communication opening 9 is provided at the lowermost portion of the partition wall 6 adjacent to the bottom wall 8, and a vibration suppressing device for a building structure.