JPH02120469A - Communicating type vibration suppressor for medium and low storied building - Google Patents

Abstract

PURPOSE:To keep the water level of liquid constant by molding a lot of vessels and regulating the natural frequency of liquid held in each of the vessel to be equal to the natural frequency of a building, integrally, and by making the adjacent vessels communicate with each other at specified positions. CONSTITUTION:A plurality of vessels 2 are integrally molded, and the adjacent vessels 2 are communicated with each other on specified levels on the communicating passages of communicating pipes 4, and a water level is contrived to be kept constant. Then, an oscillation suppressor 1 for regulating a dimension and the quantity of liquid 3 so that the natural frequency of the liquid 3 stored in the internal section may be equal to the natural frequency of a building, is set on a roof surface 5, and a small quantity of the liquid 3 is run through a top section, and the specified depth is always kept in the vessels 2. As a result, the water level of the liquid can be kept constant.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a vibration suppression device that suppresses vibrations of a building by utilizing the sloshing phenomenon of liquid contained in a container.
Targets houses and other relatively low-rise buildings.

[Conventional technology]

A so-called sloshing damper is a type of dynamic damper. Sloshing is a phenomenon that occurs when the liquid inside a tank vibrates due to an earthquake, etc. When the liquid inside resonates, a large force is applied to the side wall of the container, creating a problem in structural design. The sloshing damper makes effective use of this phenomenon, and uses a liquid container as the vibrator mentioned above.

JP-A-62-101764 discloses the basic principle of a sloshing damper, as well as providing a storage tank at a predetermined position of a structure to store a liquid that vibrates with a phase difference at the same period as the natural period of the structure. A vibration suppressing device has been disclosed that suppresses the vibration of a structure by the vibration of this liquid.

As this improved device, a device in which a plurality of adjusting members for adjusting the vibration damping of the liquid is protruded from the inner surface of a storage tank is disclosed in Japanese Patent Application Laid-open No. 63-40064, and Japanese Patent Application Laid-Open No. 63-18
Japanese Patent No. 1866 discloses a damping wall structure in which a plurality of storage chambers are provided within the wall of a structure and a communication path is formed between the parallel storage chambers. Further, Japanese Patent Application Laid-Open No. 181866/1986 discloses a vibration suppressing device using a plurality of box-shaped tanks that can be connected in series in the vertical and horizontal directions as the storage tank.

[Problem to be solved by the invention]

The above-mentioned conventional vibration suppression devices are mainly intended for buildings with a long natural period, such as high-rise buildings or tower-like structures, and are designed to deal with the shaking of buildings caused by wind or earthquakes, and are highly effective in quickly damping vibrations. And usually several tens of c
One or more storage tanks with a size of 1 to several meters are installed.

However, because the natural period of a medium- to low-rise building is short, the size of the container must be reduced in order to match the natural period of the building and the natural period of the liquid in the container. On the other hand, in order to obtain a vibration damping effect, the effective mass of the liquid is usually required to be about 0.5 to 3% of the effective mass of the building, so a large number of containers are installed. Therefore, many problems arise regarding methods of fixing to buildings, maintenance, costs, etc.

In addition, as is well known, it is most efficient to install a suro nsingdanno on the top floor (rooftop) of a building.
Rooftops generally have slopes for waterproofing reasons, and as mentioned above, a considerable number of containers are required, making it extremely difficult to keep the amount of liquid in each container constant. .

The present invention aims to solve the above-mentioned problems.

[Means for Solving the Problems] The communication type vibration suppressing device for medium and low-rise buildings of the present invention has a large number of containers constituting the device integrally molded, and adjacent containers are arranged at predetermined positions (heights). ), the water level is kept constant by communicating with the water through a communicating pipe or a slit-like communicating path.

Further, the dimensions and amount of liquid are adjusted for each container so that the natural frequency of the liquid stored inside is approximately equal to the natural frequency of the building, and the container is installed at a predetermined position in the building. In addition,
The device of the present invention is designed to keep the water level of a large number of containers constant at all times, especially considering the case where it is installed outdoors such as on a roof.

The dimensions of one container are an inner diameter of several centimeters to several tens of centimeters and a few centimeters.
It has a depth of about m, and its shape may be a cylinder, a polygonal tube, etc. A container with a hexagonal or rectangular planar cross section is the most space-efficient container with no unnecessary gaps. Plastic is suitable from the viewpoint of processing and watertightness, and dozens of pieces can be made at once using a monochrome kink.

Other materials such as metal or glass may also be used. Water is generally used as the liquid stored inside, but it is also possible to use liquids with high viscosity, liquids with different specific gravity, antifreeze to prevent freezing, etc.

[For production]

By integrally molding multiple containers, a rib-reinforced panel-like assembly is formed that not only can be transported and installed as one unit, but also resists deformation or overturning as one unit.

Because the individual containers have relatively small dimensions, the stored liquid also vibrates with a short natural period that is almost as short as the short natural period of low- and medium-rise buildings, allowing it to absorb the vibrations of the building. At this time, the effective mass of the liquid as a sloshing damper is given as the sum of the effective masses of the liquid in the individual containers.

Further, by communicating adjacent containers, fluid can flow between the containers, and the water level can be kept constant even if the containers are not completely sealed.

In particular, even if the installation location has a slope, such as a roof, by aligning the communication position with the water level and constantly flowing a small amount of water from the top, the container will always maintain a predetermined depth and the device will have a certain natural period. become.

In addition, since the small amount of water that flows out from the lowest part is on the roof, it can be drained to the existing drainage drain without the need for a special drainage device. Furthermore, since the sloshing damper essentially functions for a few seconds, the effect of water dissipation is small.

(Example〕 Next, the illustrated embodiment will be described.

FIG. 1 shows an embodiment of the present invention, in which the main body is integrally molded as a continuous body having rectangular, hexagonal, or circular depressions made of plastic, and each depression corresponds to an individual container 2.
It consists of Each container 2 contains a liquid 3 such as water, and by adjusting the dimensions of the container 2 and the depth of the liquid 3, the natural period of vibration of the liquid 3 in the container 2 can be adjusted to match the natural period of the building. Make sure they almost match. In the case of medium- and low-rise buildings, this value is, as described above, an inner diameter of about several centimeters to several tens of centimeters and a depth of about several centimeters. In this embodiment, this integrated vibration suppressing device l is installed on a sloped roof surface 5 as shown in FIG. A tube 4 is provided. Due to the slope, the liquid 3 overflowing from the upper container 2 passes through the communication pipe 4 and flows down to the lower container 2, and by replenishing a small amount of liquid 3 from the top, the water level in the upper container 2 is lowered. is always maintained at the height of the communicating pipe 4. The liquid 3 overflowing from the lowermost container 2 is drained through a drainage drain on the roof. Further, M7 is provided so as not to impair the function of the device, but it does not necessarily need to be sealed. As for the number of containers 2, the effective mass of liquid 3 is 1% of the effective mass of the building.
In order to increase the number of containers 2, it is necessary to provide hundreds or tens of individual containers 2. In addition, using a cylindrical container, 4
A relatively low-rise building (natural frequency 2.911z)
To give an example of the dimensions and number of individual containers assuming that 6000 containers are used, with an inner diameter of 85 mm and a water depth of 25 mm (water volume of approximately 140 cc), the total water volume is approximately 840 kg.

Fig. 3 shows an example in which the roof slope is steep, and the bottoms of the individual containers 2 are formed integrally according to the roof slope so that the bottom surfaces are horizontal, and the communicating pipes 4 are connected to the required water level of the individual containers 2. It is perforated to match.

On the contrary, FIG. 4 shows an embodiment in which the roof slope is gentle and almost horizontal, and the communicating pipes 4 are at the same level.

[Effects of the Invention] ■ Since a large number of containers that store liquid inside are integrally molded, it is easy to handle and install in a building.

■ Since adjacent containers are connected, the water level in each container can be easily maintained at a constant level. Even when installed on an inclined surface, by matching the communication position to the liquid water level, the natural period of the device can be maintained at a specified level. can be kept at a value.

■ Even when installed outdoors, the water level can be kept constant by constantly replenishing a small amount of liquid and allowing it to overflow, even without sealing the container.

■ Since multiple containers are integrally molded, it is much more stable against overturning than when individual containers are installed, and can be installed even on slopes.

■ Dozens of containers can be made at once, and production costs can be kept low. Furthermore, the gaps between containers can be minimized, resulting in less waste.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the outline of the device of the present invention, Fig. 2 is a vertical sectional view schematically showing the state installed on a roof surface, and Fig. 3 is a perspective view showing an outline of the device of the present invention.
The figure is a vertical sectional view showing an embodiment where the slope is steep, and FIG. 4 is a vertical sectional view showing an embodiment where there is almost no slope.

Claims (1)

[Claims] (1) In a device for suppressing vibrations of a building, a container adjusted so that the natural frequency of the liquid stored inside is almost equal to the natural frequency of the building is installed at a predetermined position of the building, and a large number of containers are installed at a predetermined position in the building. 1. A communication type vibration suppressing device for medium and low-rise buildings, characterized in that the vibration suppressing device is integrally molded and adjacent containers are communicated with each other at predetermined positions to maintain a constant water level of the liquid.