JP2018145981A - Damping device, damping structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration attenuation device and a vibration attenuation structure having a simple configuration.SOLUTION: A vibration attenuation device 5 is used while being fixed on a ceiling part of a hanging ceiling. The vibration attenuation device 5 comprises an external box 11, a weight part 13 stored in the external box 11, a roller 15 arranged at a lower surface of the weight part 13, springs 17 and the like for connecting an external surface of the weight 13 and an internal surface of the external box 11. The weight part 13 has a container 21 and several weight bodies 23 filled in the container 21. The vibration attenuation device 5 performs a vibration attenuation function when the weight part 13 fixed with the springs 17 is moved to enable oscillation of the ceiling to be reduced at the time of occurrence of earthquake. In addition, when the weight part 13 is moved, it is possible to sustain the ceiling vibration fast through attenuation effect caused by friction accompanied with motion of the weight bodies 23 filled in the container 21 or collision of the weight bodies 23.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vibration damping device and a vibration damping structure using the same.

  A suspended ceiling is one of the ceiling structures of buildings. The suspended ceiling is obtained by suspending a ceiling portion such as a ceiling board with suspension bolts. In such a suspended ceiling, a damper or a brace with a damping material is often installed on the ceiling as a vibration-damping structure for reducing shaking during an earthquake or the like (see, for example, Patent Document 1).

JP-A-2005-240538

  However, the vibration damping structure as described above is often large and costly, and sometimes interferes with ceiling equipment.

  The present invention has been made in view of such a problem, and an object thereof is to provide a vibration damping device and a vibration damping structure with a simple configuration.

  In order to solve the above-described problem, the first invention is a vibration damping device, wherein a weight portion, an outer box in which the weight portion is accommodated, a roller or a sliding portion provided on a lower surface of the weight portion, An elastic member that connects the weight portion and the outer box, and the weight portion includes a container and a plurality of granular weight bodies filled in the container. It is.

  The vibration damping device of the first invention exhibits a vibration damping function when the weight portion to which the spring is attached moves, and can reduce shaking during an earthquake or the like. When the weight portion is moved, the shaking can be quickly accommodated by the damping effect caused by the friction caused by the movement of the weight body filled in the container and the energy consumption due to the collision of the weight body. According to the first aspect of the present invention, a TMD (Tuned Mass Damper) vibration damping device having a simple configuration with a spring and a weight portion can be provided, and the vibration damping device can be miniaturized, so that installation on a ceiling or the like is relatively simple. The horizontal vibration of the ceiling or the like can be reduced without adding a large-scale configuration. Furthermore, it becomes easy to adjust the mass of the weight portion to an appropriate value by the weight body. If the container in the weight portion is filled with a liquid instead of the weight body, there is a risk of liquid leakage or the like. However, since the weight body is a granular solid, there is no such concern.

  A second invention is a ceiling damping structure using the damping device of the first invention, wherein the outer box of the damping device is fixed on a ceiling portion. Structure.

  The ceiling is, for example, a suspended ceiling, and the vibration control device is preferably fixed on a ceiling portion of the suspended ceiling.

  According to the second invention, it is possible to form a vibration damping structure with a simple configuration on the ceiling by simply fixing the vibration damping device of the first invention on the ceiling, and other equipment on the ceiling, etc. Interference can also be prevented. Although the vibration damping device can be provided on various ceilings, the vibration damping effect can be particularly preferably exhibited by providing the vibration damping device on a suspended ceiling that is likely to cause large shaking.

  According to the present invention, it is possible to provide a vibration damping device and a vibration damping structure with a simple configuration.

The figure which shows the damping structure 1. FIG. Sectional drawing which shows the damping device 5. FIG. The figure which shows the movement of a suspended ceiling. The figure shown about the movement of the weight part 13. FIG. The graph which shows the damping effect of the shake by the damping device. Sectional drawing which shows the damping device 5a.

  Hereinafter, the damping structure 1 which concerns on embodiment of this invention is demonstrated. FIG. 1 is a view showing a vibration damping structure 1. The damping structure 1 is provided on the above-described suspended ceiling. The suspended ceiling has a configuration in which the ceiling portion 3 is suspended from the lower surface of the slab 9 by suspension bolts 7.

  The ceiling part 3 is various ceiling boards, for example, and a field edge, a field edge receiver, etc. are provided as needed. In the vibration damping structure 1, a vibration damping device 5 is fixed on the ceiling portion 3. Although illustration is omitted, various equipment and the like are installed on the ceiling portion 3.

  FIG. 2 is a cross-sectional view showing the vibration damping device 5. 2A is a horizontal cross section of the vibration damping device 5, and FIG. 2B is a vertical cross section of the vibration damping device 5. 2A is a cross section taken along the line AA in FIG. 2B, and FIG. 2B is a cross section taken along the line BB in FIG. 2A.

  The vibration damping device 5 is a small TMD (Tuned Mass Damper) vibration damping device having an outer box 11, a weight portion 13, a roller 15, a spring 17, and the like.

  The outer box 11 is a box having a substantially rectangular parallelepiped shape, and is fixed on the ceiling portion 3 of the suspended ceiling using a fixture (not shown) or the like. The outer box 11 is made of, for example, metal.

  A weight portion 13 is accommodated in the outer box 11. The weight portion 13 has a substantially rectangular parallelepiped shape. The weight part 13 is arrange | positioned in the center part of the plane in the outer case 11, as shown to Fig.2 (a). In the present embodiment, the plane of the outer box 11 has a substantially square shape with a side of about 20 cm, and the plane of the weight portion 13 has a substantially square shape with a side of about 5 cm. However, the present invention is not limited to this.

  The weight part 13 moves according to the shaking of the suspended ceiling, and exhibits a vibration damping function at that time. Details of the weight portion 13 will be described later.

  The roller 15 is provided on the lower surface of the weight portion 13. In the present embodiment, the leg portion 14 is attached to the lower surface of the weight portion 13, and the roller 15 is provided at the lower end portion thereof. For example, a spherical ball roller that can rotate in all directions on the plane is used as the roller 15, whereby the weight portion 13 can move in the outer box 11 in all directions on the plane. For example, a total of four pairs of the leg portions 14 and the rollers 15 are arranged near the four corners of the lower surface of the weight portion 13. However, the leg part 14 and the roller 15 should just be at least 3 sets, and the arrangement | positioning will not be specifically limited if the weight part 13 does not roll.

  The spring 17 is an elastic member that connects the outer surface of the weight portion 13 and the inner surface of the outer box 11. In the present embodiment, a plurality of springs 17 are provided around the weight portion 13, and each spring 17 is attached to the inner side surface of the outer box 11 by an attachment portion 17 a at the end. In the example of FIG. 2A, four springs 17 respectively connect the four outer surfaces of the weight portion 13 and the inner surface of the outer box 11 at a position facing each outer surface. In addition, if the weight part 13 and the outer case 11 are connected via the spring 17, arrangement | positioning of the spring 17 and the attaching part 17a is not restricted to the example shown in figure. For example, an attachment portion is provided on the upper surface of the container 21, and on the other hand, an attachment portion 17 a is formed on the upper surface of the outer box 11, and the spring 17 is provided therebetween, so that the connection is indirectly made through another member. May be.

  As shown in FIG. 2B and the like, the weight portion 13 is configured by filling a plurality of weight bodies 23 inside a container 21 having a substantially rectangular parallelepiped shape. The container 21 is a box formed of metal or the like. The weight body 23 is a granular solid, and a metal sphere is used in the present embodiment. The weight body 23 is a small particle, and its diameter is, for example, about 1 mm to 10 mm, more preferably about 1 mm to 5 mm, in order to obtain a damping effect described later, but is not limited thereto.

  The mass of the weight portion 13 and the rigidity of the spring 17 are set to appropriate values in accordance with the vibration conditions of the suspended ceiling. For example, the mass of the weight portion 13 can be 1% or more and 5% or less of the mass of the ceiling portion 3. Thus, the mass of the weight portion 13 is not excessive. For example, when the mass of the ceiling portion 3 is about 30 kg to 50 kg, it can be suppressed to 1 kg or less. The mass of the weight portion 13 can be easily adjusted by adjusting the number and size of the weight bodies 23 filled in the container 21.

  FIG. 3 shows a state in which the suspended ceiling is moved by shaking during an earthquake or the like. FIG. 4 shows a cross section similar to FIG. 2B regarding the movement of the weight portion 13 when the suspended ceiling moves.

  In the present embodiment, for example, when the suspended ceiling moves from the initial state indicated by the dotted line in FIG. 3 as indicated by the solid line, the weight 13 of the vibration damping device 5 is inertial due to the acceleration during the movement of the suspended ceiling. The inside of the outer box 11 is moved by force. For example, when the direction of the acceleration (acceleration vector) of the suspended ceiling is the direction indicated by the arrow a in FIG. 4, the moving direction of the weight portion 13 is reversed as indicated by the arrow b.

  When the weight 13 moves in the outer box 11, the spring 17 (the right spring 17 in FIG. 4) at the movement destination of the weight 13 contracts, and the opposite spring 17 (the left spring 17 in FIG. 4). Elongates. The contracted spring 17 tries to extend, and the extended spring 17 tries to contract. However, the restoring force R acts on the outer box 11 in the direction opposite to the acceleration direction of the suspended ceiling (the restoration shown in FIG. 4). The force R is transmitted to the ceiling portion 3 from the outer box 11 and the shaking of the ceiling can be reduced. Although the restoring force R also acts on the weight portion 13 (see the leftward arrow of the restoring force R in FIG. 4), the weight portion 13 is not fixed to the outer box 11, so Thus, it is not transmitted to the ceiling part 3 through the outer box 11.

  When the weight portion 13 moves, the plurality of weight bodies 23 inside the container 21 also move in the container 21 due to the inertial force accompanying the acceleration when the weight portion 13 moves, and the friction of the weight body 23 and the weight body at that time Energy is consumed by the collision between 23. Thereby, the shaking of a suspended ceiling can be attenuated at an early stage.

  FIG. 5 is a graph showing the damping effect of the vibration by the vibration damping device 5, and the solid line graph “with grains” is filled with a plurality of weight bodies 23 in the container 21 like the weight portion 13 of the present embodiment. The attenuation characteristics are shown. On the other hand, a dotted line graph of “no grain” shows a case where a moving body having the same mass as the weight portion 13 but not having the weight body 23 is used instead of the weight portion 13. As shown in FIG. 5, when the weight portion 13 filled with a plurality of weight bodies 23 in the container 21 is used, it can be seen that the shaking is quickly settled by the energy consumption.

  As described above, the vibration damping device 5 according to the present embodiment exhibits a vibration damping function when the weight portion 13 to which the spring 17 is attached moves, and can reduce ceiling shaking during an earthquake or the like. Further, when the weight portion 13 is moved, the ceiling shake can be quickly accommodated by the damping effect caused by the friction accompanying the movement of the weight body 23 filled in the container 21 and the energy consumption due to the collision of the weight body 23. A general attenuator included in the vibration device can be omitted.

  As described above, according to the present embodiment, a TMD vibration damping device having a simple configuration using the spring 17 and the weight portion 13 can be provided, and the vibration damping device can be miniaturized, so that installation on the ceiling is relatively simple. The horizontal vibration of the ceiling can be reduced without adding a large-scale configuration.

  Furthermore, the weight body 23 makes it easy to adjust the mass of the weight portion 13 to an appropriate value. Further, if the container 21 is filled with liquid instead of the weight body 23, there is a risk of liquid leakage, but the weight body 23 is a granular solid, so there is no such concern and it is suitable for installation on the ceiling. is there.

  In the present embodiment, the vibration damping structure 1 having a simple configuration can be formed on the ceiling simply by fixing the vibration damping device 5 on the ceiling portion 3, and other equipment and the like on the ceiling portion 3. Interference can also be prevented. Further, in the present embodiment, the vibration damping effect can be particularly preferably exhibited by providing the vibration damping device 5 on the suspended ceiling where large shaking is likely to occur.

  However, the present invention is not limited to this. For example, in the present embodiment, the vibration damping device 5 is provided on the suspended ceiling, but the vibration damping device 5 may be provided on a ceiling having another structure. In this case as well, the same damping function can be exhibited by fixing the damping device 5 on the ceiling. Furthermore, it is also possible to provide the vibration damping device 5 in a structure other than the ceiling.

  Further, the roller 15 is not limited to the above-described ball roller. For example, a disc-shaped roller that rotates in one direction on the plane can be used as the roller 15 by providing a leg 14 with a mechanism that can rotate in a plane. Also in this case, the weight portion 13 can move in the outer box 11 in all directions on the plane.

  Further, in the present embodiment, the roller 15 is provided on the lower surface of the weight portion 13 and the weight portion 13 can be moved by the rotation thereof. However, as shown in the vibration damping device 5a of FIG. The sliding portion 16 that slides with respect to the bottom surface in the outer box 11 may be provided at the lower end portion of the leg portion 14a. The sliding part can be realized by, for example, a metal plate subjected to a sliding process using Teflon (registered trademark) or the like.

  Moreover, although the shape of the damping device 5 or the weight part 13 is a substantially rectangular parallelepiped, it is not limited to this and can be determined as appropriate. The weight body 23 is not limited to a sphere, and may have a shape other than a sphere.

  Furthermore, the arrangement of the spring 17 is not limited to the above-described one, and can be determined as appropriate according to the shape of the vibration damping device 5 and the weight portion 13 or the like. It is also possible to use another elastic member instead of the spring 17.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

DESCRIPTION OF SYMBOLS 1 ......... Damping structure 3 ......... Ceiling part 5, 5a ......... Damping device 7 ......... Hanging bolt 9 ......... Slab 11 ......... Outer box 13 ......... Weight part 14 ......... Leg Part 15 ... Roller 16 ... Slide part 17 ... Spring 17a ... Mounting part 21 ... Container 23 ... ... Weight body

Claims (3)

A damping device,
A weight part;
An outer box in which the weight portion is accommodated;
A roller or sliding portion provided on the lower surface of the weight portion;
An elastic member connecting the weight part and the outer box;
Comprising
The said weight part has a container and the some granular weight body with which the said container is filled, The damping device characterized by the above-mentioned. A ceiling damping structure using the damping device according to claim 1,
A vibration damping structure, wherein the outer box of the vibration damping device is fixed on a ceiling.   The vibration damping structure according to claim 2, wherein the ceiling is a suspended ceiling, and the vibration damping device is fixed on a ceiling portion of the suspended ceiling.

Images