JPH04323473A - Vibration damping device for buildings - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to vibration damping structures for buildings.

0002

2. Description of the Related Art When a building has a machine or other vibration source inside, the entire building vibrates. For example, as shown in FIG. 6, in the case of parking tower a, when the mechanical parking device installed inside is operated, this becomes a vibration source and parking tower a vibrates in its own vibration mode. As a result, the outer wall of parking tower a may function similarly to the diaphragm of a speaker, imparting low-frequency sound or low-frequency vibration to surrounding houses b and c.

[0003] On the other hand, in order to dampen the vibrations of the parking tower, there has been a proposal to attach a vibration damping device to the mechanical parking device inside the tower. For example, Japanese Utility Model Application Publication No. 59-48962 discloses a proposal to suspend and support the support base of a parking device from a parking tower, and Japanese Utility Model Application Publications No. 62-71435 and Japanese Utility Model Application Publication No. 63-201237 disclose , has disclosed a proposal for attaching vibration damping means to the base of a parking device.

[0004] Furthermore, Japanese Patent Application Laid-open No. 17441/1983 describes a pendulum type vibration damping device in which a weight is suspended from a vibrating body by a pendulum, and a damper is interposed between the weight and the vibrating body.

[0005]

[Problem to be Solved by the Invention] In the case of the above-mentioned proposal for reducing the transmission of vibrations of the mechanical parking device to the parking tower, although it has some effect, it does not suppress the vibration of the parking tower itself. However, the support structure of the parking device becomes complicated, and if a sufficient vibration damping effect is to be obtained, the cost increases.

On the other hand, in the case of the above-mentioned pendulum-type vibration damping device, the damping effect is obtained by the dynamic force between the weight at the tip of the pendulum and the damper, but the installation of the damper complicates the structure and requires a large It is difficult to obtain a damping effect.

That is, an object of the present invention is to make it possible to suppress vibrations of a building itself such as a parking tower effectively and at low cost with a simple structure.

[0008]

[Means for Solving the Problems] The present invention addresses these problems by suspending a mass body from a building such as a parking tower, and by providing a sliding member on which the mass body slides on the building. This is to suppress vibrations in buildings.

That is, the means for this purpose includes a mass body that is swingably suspended by a hanging member from a part of the building that vibrates with respect to the road surface, and a mass body that is fixedly provided to the building and that the mass body corresponds to. A vibration damping device for a building, comprising: a sliding member having a sliding surface that slides during contact and rocking.

[0010] In the above-mentioned vibration damping device, the mass body is constituted by a container which is swingably suspended from a vibration part of a building by a hanging member, and a fluid contained in this container. It becomes a more effective means of solving problems. In this case, the fluid may be a liquid or a semi-fluid material, such as a colloidal sol, or an aggregate of particles such as sand.

[0011]

[Operation] In the above vibration damping device, when the natural frequency of the vibrating part of the building matches the frequency of the external force acting on that part, resonance occurs and the part vibrates with a large amplitude. Since a vibrating body, that is, a mass body is separately provided at the vibrating part, the whole becomes a system with two degrees of freedom, that is, there are two resonance points, which deviate from the frequency of the external force, and the amplitude of the part mentioned above becomes becomes smaller. In this case, if the natural frequency of the mass body is made to match the frequency of the external force, the amplitude of the above portion at that frequency will theoretically become zero.

[0012] When the vibrating part of the building and the mass body start to vibrate from a stationary state,
Even if this vibrating part is displaced, the mass body tries to remain in its original position due to inertia, but at that time, the mass body slides on the sliding surface of the sliding member, and the mass body and the sliding member Frictional force is generated between them. Since the direction of action of this frictional force is opposite to the direction of displacement of the vibrating portion, the vibration of the vibrating portion is suppressed by the frictional force.

That is, the vibration of the building is effectively suppressed by the dynamic vibration absorption effect of the mass body and the frictional force between the mass body and the sliding member.

[0014] Furthermore, in the case where the mass body is composed of a container and a fluid, when the container shakes due to vibrations of the building, the fluid tends to remain in its original position due to inertia, resulting in The shaking of the mass body is suppressed, and the restoring force given to the building is increased.

[0015]

[Effects of the Invention] Therefore, according to the present invention, a mass body is swingably suspended from a vibrating part of a building by a hanging member, and a sliding member on which the mass body slides is provided on the building. , the vibration of the building can be suppressed by the dynamic vibration absorption effect of the mass body and the frictional force between the mass body and the sliding member, and the building can be built with a simple structure without the need for a special damper device. The vibration damping effect can be enhanced.

[0016] Furthermore, when the mass body is composed of a container and a fluid, the mass body itself has two degrees of freedom, so that the vibration damping effect of the building is further enhanced.

[0017]

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings.

[0018] In this example, the building is a parking tower (multi-level parking lot), and the overall configuration is shown in FIG.

In the figure, 1 indicates upper and lower sprockets 2.
, a parking device in which a large number of cages 5 for storing and mounting vehicles W are supported in a circularly movable manner by chains 4 suspended from , 3;
Reference numeral 6 indicates a parking tower having a steel frame structure and housing this parking device 1. The parking tower 6 includes pillars 7, beams 8 vertically arranged at intervals, and diagonal members 9 as its frame, that is, as steel members. As shown in FIG. 2, the beam 8
The outer wall board 12 is supported via the vertical rim 11 (
In Fig. 1, illustration of the vertical torso is omitted).

In FIG. 1, reference numeral 10 denotes a bracket that supports the cage 5 on the chain 4.

The parking tower 6 is provided with vibration damping devices 15 and 16 for damping the vibration. That is, as shown in FIG. 3, the vibration damping device 15 includes a mass body 22 that is swingably suspended from the beam 8 by a hanging member 21, and a mass body 22 that is fixed to the column 7. The sliding member 23 includes a sliding surface that comes into contact with the sliding member 23 and slides during rocking. The vibration damping device 16 includes a mass body 22 similar to that of the vibration damping device 15 mounted on the pillar 7 or the beam 8 by a hanging member 2.
It is suspended by 1.

In the case of this example, the hanging member 21 is constituted by a rod member whose upper end is pivoted to the pillar 7 or the beam 8,
The mass body 22 is a spherical body. The sliding member 23 is constituted by a plate having a vertical sliding surface. In the vibration damping device 15, the hanging member 21 is not provided vertically, but is tilted so that the load of the mass body 22 is constantly applied to the sliding surface of the sliding member 23. At least it is provided.

Therefore, in the case of the vibration damping device 15, when the parking tower 6 starts to vibrate in a direction parallel to the sliding surface of the sliding member 23, the mass body 22 is caused to return to its original position due to inertia against the vibration of the parking tower 6. parking tower 6 due to dynamic vibration absorption
suppresses the shaking. At the same time, since a relative displacement occurs between the mass body 22 and the parking tower 6, the mass body 22
3, and a frictional force acts between them. Since this frictional force acts in the opposite direction to the direction of displacement due to vibration of the parking tower 6, it acts as a force that suppresses the shaking of the parking tower 6. Further, the vibration damping device 16 also suppresses the vibration of the parking tower 6 by dynamic vibration absorption.

FIGS. 4 and 5 show a vibration damping device 25 according to another embodiment.

In this vibration damping device 25, the mass body 26
is composed of a container 27 and a fluid 28 contained in this container 27. The mass body 26 includes a pair of brackets 29 fixed to the beam 8 at intervals in the longitudinal direction of the beam.
The mass body 26 is suspended from the lower end of the mass body 29 via a suspension member 30 so as to be swingable in the longitudinal direction of the beam, and the upper end of the mass body 26 is in contact with sliding members 31, 31 fixed to the bracket 29. .

To explain specifically, first, the fluid 2
8 is a colloid sol. The bracket 29 has an inverted U shape, and the upper ends of rod-shaped hanging members 30, 30 are pivotally connected to the lower ends of the opposing vertical walls by pins, and the lower ends of the hanging members 30, 30 are connected to the lower ends of the container 27. It is pivotally attached to the part by a pin. In this case, the upper end pivot point of the hanging member 30 is at a height that substantially matches the height of the center of gravity of the mass body 26, and
6 has an upper portion protruding above the upper end pivot point. The outer surfaces of plate-shaped sliding members 31, 31 are fixed to each of the opposing vertical walls of the U-shaped bracket 29, and the opposing inner surfaces of both sliding members 31, 31 are fixed to the container 27 of the mass body 26. It is formed on a sliding surface on which the outer surface of the upper end portion slides.

Therefore, in the case of the vibration damping device 25, since the upper end pivot point of the hanging member 30 is located near the height of the center of gravity of the mass body 26, it is possible to suppress vibrations of the parking tower 6 at a relatively high frequency. suitable for Then, the mass body 26 connects the container 27 and the fluid 28.
Therefore, when the container 27 swings, the fluid 28 tries to remain in its original position due to inertia, so the swing of the mass body 26 is suppressed, and the frictional force caused by the sliding member 31 is As a result, the vibration damping effect of the parking tower 6 becomes higher.

Although the hanging member in the above embodiment is rod-shaped, it is also possible to use a string-like member such as a wire rope or a plate-like member.

In addition, although colloidal sol was used as the fluid in the above embodiments, other fluid substances may be used, or liquids such as water may be used, and aggregates of particles such as sand may also be used. It's okay.

[Brief explanation of drawings]

1 to 5 show embodiments of the invention.

[Figure 1] Front view of the building with part of the outer wall removed

[Figure 2
] Cross-sectional view with some parts of the building omitted

[Figure 3] Front view with a partial cross section showing the vibration damping device

[Fig. 4] Side view showing another embodiment of the vibration damping device

[Fig. 5] A vertical sectional view showing the vibration damping device of the above other embodiment.

[Figure 6] Side view showing the impact of parking tower vibration on surrounding houses

[Explanation of symbols]

1 Parking device 6 Parking tower (structure) 7 Pillar 8 Beam 15, 25 Vibration damping device 21, 30 Hanging member 22, 26 mass body 23, 31 Sliding member 27 Container 28 Fluid

Claims (2)

[Claims] Claim 1: A mass body that is swingably suspended from a part of a building that vibrates with respect to the road surface by a hanging member, and a mass body that is fixedly provided to the building and that comes into contact with the building when it swings. A vibration damping device for a building, comprising: a sliding member having a sliding surface that slides on the vibration damping device. 2. The control system for a building according to claim 1, wherein the mass body comprises a container swingably suspended from a vibration part of the building by a hanging member, and a fluid contained in the container. Shaking device.