JP2002227395A - Vibration control mechanism for floor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration control mechanism for a floor performing a vibration control function to the vibration of floor structure even with a small number. SOLUTION: This vibration control mechanism for the floor is mounted to the floor structure or the like of a building for dwelling units to control vibration generated by the life of an inhabitant. The vibration control mechanism is provided with at least two mass-damping type vibration control devices 14a, 14b, and an arm member 15 for connecting the mass-damping type vibration control devices 14a, 14b. The mass-damping type vibration control devices 14a, 14b and the center-of-gravity position 15A of the arm member 15 are mounted into the vibrating position of the floor structure to be vibration-controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping mechanism for floors using a mass-damping type vibration damping device for damping floors of dwelling units and houses.

[0002]

2. Description of the Related Art Recent dwelling units and houses (hereinafter referred to as dwelling units).
In recent years, 2D4 construction, prefabricated construction, reinforced concrete construction, etc., in which a living space is constructed by assembling standard panels or lightweight steel frames, instead of traditional wooden construction, are increasing.

[0003] In these modern buildings, lightweight and high-rigidity materials such as new building materials are often used, and the building materials themselves have a property of easily propagating vibration, and in order to obtain a large living space. In some cases, the floor itself is easily vibrated, for example, by widening the floor. As a means of damping these floor vibrations, there are methods of increasing the rigidity of beams such as large beams and small beams, and methods of increasing the rigidity of the floor while minimizing the weight of the floor as much as possible. In order to obtain, the cost was increased.

As a floor vibration isolating mechanism that solves the above problems, a vibration isolating mechanism using a mass-damping type vibration isolator disclosed in Japanese Patent Application Laid-Open No. H11-2286 has been developed. FIG. 5 is a sectional view of a conventional mass-damping type vibration damping device, and FIG. 6 is a perspective view showing a mounted state of the mass-damping type vibration damping device shown in FIG. . In the figure, 1 is a mass-damping type vibration damping device, 2 is a cylindrical case, and the cylindrical case 2 has a flange portion 2A fixed to the bottom thereof. Reference numeral 3 denotes a bottom plate, and the bottom plate 3 is fixed to the flange portion 2A of the cylindrical case 2 by screws 4 in a liquid-tight manner.
Reference numeral 5 denotes a disk-shaped cushion rubber, the outer peripheral portion of which is vulcanized and bonded to the inner surface of the cylindrical case 2, and the inner peripheral side thereof is vulcanized and bonded to a metal stud 6. The stud 6 is connected in a liquid-tight manner. This stud 6
The protrusion provided at the upper end of the rim is threaded, and this stud is fastened to the floor structure. A damping plate 7 is attached to a lower end of the stud 6 by caulking. The damping plate 7 is positioned in a liquid chamber formed by the cylindrical case 2, the cushion rubber 5, the stud 6, and the bottom plate 3, and is sealed together with a high-viscosity damping oil 8. Then, a donut-shaped damping mass 9 is placed on the flange portion 2 </ b> A of the cylindrical case 2, and the bottom plate 3 is fixed together with the screw 4.

[0005] The floor structure is basically constituted by connecting two large beams 10 extending in the longitudinal direction by a plurality of small beams 11 extending in the lateral direction, and a joist 12 is provided on the upper surface of the small beam 11. Then, the floor plate 13 is placed.

In a conventional floor vibration isolating mechanism, in a floor structure of a dwelling unit, the mass-damping type vibration isolating device 1 is located at a vibration position in the floor structure, that is, a lower portion of the small beam 11 located at an antinode position in plane vibration mode vibration. To attenuate the vibration of the floor structure transmitted to the small beams 11. That is, the mass-damping type vibration damping device converts the input vibration into an inertial motion of the mass of the vibration damping device, and disperses the inertial motion by a built-in liquid type very strong damping mechanism.

[0007]

However, in the conventional vibration damping mechanism for floors, it is necessary to install the mass-damping type vibration damping device at the antinode of the plane vibration mode vibration. In the case where vibration-damping is performed up to the vibration mode vibration, three mass-damping type vibration damping devices need to be installed.
Further, when a large number of mass-damping type vibration damping devices are provided, the weight of the floor structure is increased. Therefore, in the case of a high-rise house, there is a problem that a strong design is required.
Therefore, an object of the present invention is to provide a vibration damping mechanism for floors that exhibits a vibration damping function even with a small number of floor vibrations.

[0008]

In order to achieve the above object, an invention according to claim 1 is provided on a floor structure of a building for a dwelling unit or the like, and is used for a floor for damping vibration caused by a resident's life. An anti-vibration mechanism, comprising: at least two or more mass-attenuation type anti-vibration devices; and an arm member connecting the mass-attenuation type anti-vibration devices. The center of gravity is to be attached to the vibration position of the floor structure to be damped.

Further, the invention according to claim 2 is a floor vibration damping mechanism which is attached to a floor structure of a building for dwelling units and damps vibration caused by living of a resident, wherein the first mass-damping mechanism is provided. Type vibration damping device, a second mass-damping type vibration damping device, the first mass-damping type vibration damping device connected to one end, and a second mass-damping type vibration damping device connected to the other end. An arm member to which a vibration isolator is connected, wherein the mass-attenuation type vibration isolator and the center of gravity of the arm member are attached to a vibration position of a floor structure to be subjected to vibration isolation.

[0010] Further, the invention according to claim 3 is based on claim 1.
Alternatively, in addition to the configuration of the invention described in 2, the arm member is attached to a node position of a plane vibration mode in a floor structure.

Generally, as a countermeasure against resonance of the vibration structure,
The installation of a dynamic damper is conceivable, but due to its nature, the dynamic damper exhibits a vibration damping effect by tuning to a fixed resonance frequency.
It is not suitable for impact vibration having a wide frequency range such as floor vibration. On the other hand, since the mass-damping type vibration damping device has a strong damping structure using damping oil, it is not necessary to adjust the resonance frequency, and it works favorably against impact vibration. The plane vibration mode is a vibration mode in a plane element such as a floor structure, and in a general building, a low-order plane vibration mode often becomes a problem. This is because, for the same energy, the amplitude of the low-order surface vibration mode is larger. Therefore, it is more intuitively effective to take anti-vibration measures for the low-order surface vibration mode.

The operation of the floor vibration isolating mechanism according to the present invention will be described below with reference to FIGS. FIG. 1A is a top view model diagram in which the floor vibration isolating mechanism of the present invention is applied to a floor structure in a dwelling unit, and FIG. 1B is a view illustrating the mounting of the floor vibration isolating mechanism in FIG. It is a side view model figure which shows a state. FIG. 2 is a vibration model diagram illustrating a surface vibration mode of a floor structure. In the figure, reference numerals 14a and 14b denote mass-damping type vibration damping devices.
a and 14b are suspended and fixed to both ends of the arm member 15, respectively. 10 is a girder, and this girder 10
Are arranged on both sides of the floor structure and are connected by small beams 11a and 11b to form a surface structure. The small beam 11a
Is located at the center of the floor structure, and the center of gravity 15A of the arm member 15 is fastened and fixed to the center of the beam in a non-rotatable manner.

Here, the surface vibration mode of the floor structure will be described with reference to FIG. In the figure, "+" notation and "-" notation indicate antinode positions in each surface vibration mode, and indicate relative positional relations to the floor surface in the vibration mode. The primary surface vibration mode diagram shows a state in which the center of the floor surface vibrates vertically, and the secondary surface vibration mode diagram shows a state in which the floor surface is divided into two parts at the center and vibrates in opposite phases. Is shown.

In the model of the floor vibration mechanism shown in FIG. 1, in the above-described primary surface vibration mode, the center of the floor vibrates in the vertical direction. In order to vibrate downward, the mass-damping type vibration damping devices 14a and 14b also vibrate in the same phase and attenuate the vibration. At this time, the two mass-damping type vibration damping devices simultaneously function in the same phase. Next, in the case of the secondary surface vibration mode, the floor surface is divided into two parts at the center and vibrates in opposite phases.
Since the small beam 11a to which the arm member 15 is attached hits a node, the small beam 11a and the arm member 15 do not move up and down. However, since both wing surfaces vibrate in opposite phases around the small beam 11a, the small beam 11a is torsionally vibrated.
Also torsional vibration. At this time, the mass-damping type vibration isolator 14a, 14b attached to both ends of the arm member 15
Moves up and down on the circumference drawn by both ends of the arm member 15, so that the torsional vibration can be attenuated.

Therefore, when the mass-damping type vibration damping device is connected to the node in the secondary surface vibration mode via the arm member, all the mass-damping devices connected to the arm member are connected in the primary surface vibration mode. Since the anti-vibration device functions, a strong anti-vibration effect can be obtained, and at the same time, an anti-vibration effect can be obtained in the secondary surface vibration mode. On the other hand, in the conventional floor vibration isolating mechanism, it is necessary to install a mass-damping type vibration isolating device at the antinode position in the plane vibration mode. A vibration isolator is required, and the mass-damping type vibration isolator installed for the primary surface vibration mode does not function for the secondary surface vibration mode because it is located at the node.

It is a generally known fact that the vibration amplitude decreases as the order of the vibration mode increases if the vibration energies are the same. Can function more strongly in the lower order modes of the first and second order as shown in FIG. Also,
In the floor vibration isolator mechanism of the present invention, the damping force can be adjusted also by the length of the arm member 15.

[0017]

FIG. 3 is a perspective view showing a first embodiment of a floor vibration isolating mechanism according to the present invention. FIG. 4 is a cross-sectional view of the one-sided mass-damping type vibration damping device shown in FIG. In the figure, 16 is a mass-damping type vibration damping device,
The mass-damping type vibration damping device 16 includes a damping mass 17 formed in a rectangular shape and a damping mechanism main body 18. The damping mechanism body 18 is a liquid-filled damping device, and has the following configuration. Reference numeral 19 denotes a cup-shaped case having a stepped body formed by press-forming a stainless steel plate. The cup-shaped case 19 has a case attenuation plate 20 fitted and fixed to the stepped portion. Reference numeral 21 denotes a disk-shaped cushion rubber, the outer peripheral portion of which is vulcanized and bonded to the inner peripheral surface of a flanged sleeve 22, and the inner peripheral side of which is vulcanized and bonded to a metal stud 23 to form a substantially lid shape. ing. Then, the outer peripheral surface of the flanged sleeve 22 is liquid-tightly fixed to the cup-shaped case 19 via a rubber seal member 24, so that the cup-shaped case 1
Nine openings are sealed. The stud 23 has a screw hole 26 for fixing the damping plate 25 at the lower end thereof and fixing the mass-damping type vibration damping device 16 to the floor structure at the upper end. The damping plate 25 is positioned in a liquid chamber formed by the cup-shaped case 19, the cushion rubber 21, the flanged sleeve 22, the rubber seal member 24, and the stud 23, and is sealed together with a high-viscosity damping oil 27. The arm member 15 is fastened with the screw hole 26, and the arm member 15 is further installed on the upper surface of the small beam 14a and fastened and fixed with a bolt.

The damping mass 17 has a cavity at the center, the damping device body 18 is arranged in the cavity, and a flange provided on a cup-shaped case 19 of the damping body 18 is provided. Sleeve 2 with flange
2 and a mounting plate 28 made of a stainless steel plate, and fastened and fixed by a stainless steel bolt 29.

Since the arm member 15 is fastened to the upper surface of the small beam 14a, the mass-damping type vibration isolator 16a, 1
6b can be accommodated in the gap formed by the small beams 14a and the small beams 14b, so that even when the space under the floor is narrow, the floor vibration isolating mechanism can be installed.

[0020]

As described above in detail, according to the vibration damping mechanism for floors of the present invention, the mass-damping type vibration damping device is connected to the floor structure via the arm member. In addition to vertical movement, torsional vibration can be prevented.
Further, when the mass-damping type vibration damping device is connected to the node in the n-th surface vibration mode via the arm member, the mass-
Since the damping type vibration damping device functions, a strong vibration damping effect can be obtained, and at the same time, the vibration damping effect can be obtained also in the n-th surface vibration mode.

[Brief description of the drawings]

FIG. 1A is a top model diagram in which a floor vibration isolating mechanism of the present invention is applied to a floor structure in a dwelling unit.
(B) is a side view showing the mounting state of the floor vibration isolating mechanism in (a).

FIG. 2 is a vibration model diagram illustrating a surface vibration mode of a floor structure.

FIG. 3 is a perspective view showing a first embodiment of a floor vibration isolating mechanism according to the present invention.

FIG. 4 is a diagram A of the one-side mass-damping type vibration damping device shown in FIG. 3;
FIG. 4 is a sectional view taken in the direction of arrow A.

FIG. 5 is a sectional view of a conventional mass-damping type vibration damping device;

6 is a perspective view showing a mounting state of the mass-damping type vibration damping device in FIG. 5, in which a floor structure is partially cut.

[Explanation of symbols]

1, 14a, 14b, 16a, 16b: mass-damping type vibration damping device 2: cylindrical case 2A: flange portion 3: bottom plate 4: screw 5, 21: cushion rubber 6, 23 ... stud 7, 25 ... damping plate 8, 27 ... damping oil 9, 17 ... damping mass 10 ... large beam 11, 11a, 11b ... small beam 12 ... Joist 13 ・ ・ ・ floor plate 15 ・ ・ ・ arm member 15A ・ ・ ・ center of gravity 18 ・ ・ ・ damping mechanism body 19 ・ ・ ・ cup-shaped case 20 ・ ・ ・ case damping plate 22 ・ ・ ・ sleeve with flange 24 ・ ・ ・Rubber seal member 26: screw hole 28: mounting plate 29: bolt

Claims (3)

[Claims] 1. A floor vibration isolating mechanism attached to a floor structure of a building for dwelling units and for damping vibrations caused by the life of a resident, comprising at least two or more mass-damping type vibration damping devices; An arm member for connecting the mass-damping type vibration isolator is provided, and the center of gravity of the mass-damping type vibration isolator and the arm member are attached to a vibration position of a floor structure to be subjected to vibration isolation. Floor anti-vibration mechanism. 2. A vibration damping mechanism for a floor attached to a floor structure or the like of a building for dwelling units and for damping vibrations caused by the life of a resident, comprising: a first mass-damping type vibration damping device;
And an arm member having the first mass-damping type vibration isolator connected to one end thereof and the second mass-damping type vibration isolating device connected to the other end thereof. And a center-of-gravity position of the mass-damping type vibration isolator and the arm member is attached to a vibration position of a floor structure to be vibration-isolated. 3. The vibration damping mechanism for floors according to claim 1, wherein the arm member is attached to a node position of a plane vibration mode in the floor structure.