JP2017089307A - Dynamic damper and ceiling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dynamic damper and a ceiling provided therewith, the dynamic damper offering high workability when assembling into the ceiling and an effect to reduce a floor impact sound.SOLUTION: A dynamic damper 1 includes: a mass body 11 having a first edge part 11A and a second edge part 11D positioned leaving an interval from the first edge part 11A that equals or is greater than an interval W2 between two ceiling joists 2; and an elastically deformable support body 12 connected to the mass body 11 at a location between the first edge part 11A and the second edge part 11D, and having a mounting surface 13A mounted on a top surface 5A of a ceiling board 5 for supporting the mass body 11. A height dimension W3 between an undersurface 11B of the first edge part 11A and the mounting surface 13A, as well as a height dimension W3 between an undersurface 11B of the second edge part 11D and the mounting surface 13A, is greater than a height dimension W4 of the ceiling joist 2.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a dynamic damper and a ceiling including the same.

  In buildings such as houses and condominiums, it is necessary to reduce the floor impact sound transmitted from the upper floor to the lower floor, and various countermeasures have been studied for this problem. For example, measures to increase the weight of floor materials and ceiling materials used in buildings and measures to give floor materials and ceiling materials a vibration-proof function have been devised.

  In Patent Document 1 below, as an example of measures for reducing floor impact noise in such a building, it is proposed to install a dynamic damper composed of a mass body and an elastic body in a ceiling base. In this publication, a plurality of field edges and field receivers are assembled in a lattice pattern on a ceiling board, and a damper is attached to the field receiver.

JP 2006-342580 A

  Since the damper disclosed in Patent Document 1 is fixed to a field receiver, it requires a lot of work. Moreover, since it is necessary to assemble a heavy weight bearing with a plurality of dampers fixed, there is a problem that it becomes heavy labor. In addition, since the damper is fixed to the ceiling board via the field edge and the field edge, the natural period of the damper after fixation is the damper before fixation due to the effect of the assembled state of the field edge and the field edge and their rigidity. It deviates below the natural period of a single unit. Therefore, there is a problem that the function of the damper cannot be obtained sufficiently and the floor impact sound cannot be sufficiently reduced.

  The present invention has been made in view of the above-mentioned problems, and the object thereof is a dynamic damper excellent in workability at the time of assembling into the ceiling and excellent in the effect of reducing floor impact noise, and a ceiling including the same. Is to provide.

  A dynamic damper according to an aspect of the present invention is installed on a ceiling including two field edges arranged at intervals in a predetermined arrangement direction, and a ceiling board fixed to the lower surfaces of both field edges. Dynamic damper. The dynamic damper includes a mass body having a first end portion, and a second end portion disposed at a distance equal to or greater than a distance between both field edges with respect to the first end portion, the first end portion, and the first end portion, And at least one support body that is connected to the mass body between the second end portion and has a placement surface that is placed on the top surface of the ceiling board and supports the mass body and is elastically deformable. The height dimension between the lower surface of the first end and the placement surface and the height dimension between the lower surface of the second end and the placement surface are higher than the height of the field edge. large.

  The dynamic damper can be temporarily installed such that the first and second ends of the mass body are hooked on the upper surface of the field edge. Here, since the height dimension between the lower surface of the first and second end portions and the placement surface is larger than the height dimension of the field edge, the above placement surface is positioned below the lower surface of the field edge. To do. Then, lift the ceiling board and fix the ceiling board to both edges from below. In the process, the damper is lifted in a state where the placement surface is placed on the ceiling board. Thus, the installation of the damper is completed by fixing the ceiling board to the field edge. As described above, the dynamic damper is excellent in workability because it does not need to be fixed to the field edge as in the prior art and does not need to be fixed to the ceiling board in advance.

  In addition, the dynamic damper is placed on the upper surface of the ceiling board in the installation completion state, and the first and second ends of the mass body are separated from the field edge by lifting the ceiling board. Thereby, a mass body can be vibrated and the effect | action as a damper is acquired. Here, because the damper is placed in direct contact with the ceiling board, unlike the case where the damper is fixed to the ceiling board via other members as in the past, the natural period of the damper is different from that before fixing. It is possible to prevent the displacement and efficiently transmit the reaction force of the damper to the ceiling board. For this reason, the dynamic damper is not only excellent in workability but also excellent in the effect of reducing floor impact sound.

  When the dynamic damper is disposed so that the first end projects from the inner surface of one field edge by a predetermined length to the outside in the arrangement direction, the dynamic damper projects to the inner surface of the other field edge. You may have the opposing surface arrange | positioned inside the said arrangement | positioning direction through the clearance gap smaller than length.

  As a result, even when the damper is displaced to the other field edge side, the opposed surface collides with the field edge, so that the state in which the first end projects from the inner surface of the one field edge is maintained. Therefore, the damper can be prevented from falling.

  In the dynamic damper, the facing surface may be provided at a position above the placement surface and at a predetermined height distance below the lower surface of the first end portion. The height distance is larger than a distance obtained by subtracting the height dimension of the field edge from the height dimension between the lower surface of the first end portion and the placement surface.

  Thereby, in the state which the ceiling board was fixed to the field edge and the mass body left | separated from the field edge, an opposing surface can be made to oppose a field edge. Therefore, even when the position of the damper is shifted, the state in which the end of the mass body protrudes outward from the inner surface of the field edge is maintained, and even when the ceiling board is broken, the damper can be prevented from falling.

  In the dynamic damper, the support may include an elastically deformable elastic body connected to the mass body, and a restraining member connected to the elastic body and having the facing surface.

  Thereby, the position of the opposing surface can be adjusted by the size and arrangement of the restraining member while the elastic body has a function of deforming according to the vibration of the ceiling. Therefore, it is not necessary to change the design of the elastic body even when adjusting the position of the facing surface, and there is an advantage that the period of the damper does not change.

  In the dynamic damper, the support may have a width smaller than a distance between both field edges. The restraining member may be connected to a lower end portion of the elastic body, and may have a side surface that is the facing surface and a lower surface that is the placement surface. The thickness of the restraining member may be larger than a distance obtained by subtracting the height dimension of the field edge from the height dimension between the lower surface of the second end portion and the placement surface.

  Thereby, in the temporary installation state in which the first and second ends of the mass body are hung on the upper surface of the field edge, the support body is positioned between both field edges and the restraining member is opposed to the field edge. it can. Therefore, even if the position is shifted when the damper is lifted by the ceiling board, the restraining member and the field edge collide, so that the damper can be prevented from being sandwiched between the ceiling board and the field edge. Thereby, the problem of unevenness of the ceiling board can be avoided.

  In the dynamic damper, the mass body may be made of gypsum.

  Since the dynamic damper can be installed in a planar shape so as to straddle both edges at a portion close to the ceiling surface of the ceiling pocket, a large area can be secured. Therefore, even when a material having a small specific gravity is used for the mass body, it is possible to secure a weight necessary for functioning as a damper. Therefore, in the dynamic damper, by using gypsum, which is a recyclable and non-combustible material, as a constituent material of the mass body, a dynamic damper that is resistant to fire and can reduce costs can be configured.

  The dynamic damper may include a plurality of the support bodies arranged away from each other in a direction from the first end portion toward the second end portion.

  Thereby, the mass body can be stably supported by the plurality of supports in the direction from the first end portion toward the second end portion.

  The dynamic damper may include a plurality of the support bodies arranged apart from each other in a direction orthogonal to a direction from the first end portion toward the second end portion.

  Accordingly, even when the area of the mass body is increased by increasing the width of the mass body in the direction orthogonal to the direction from the first end portion to the second end portion, the mass body can be stably supported by the plurality of support bodies. . As a result, the bending of the mass body can be reduced.

  A ceiling according to another aspect of the present invention is provided on two upper edges arranged at intervals in a predetermined arrangement direction, a ceiling board fixed to the lower surface of both field edges, and an upper surface of the ceiling board The dynamic damper.

  In the ceiling, the damper can be brought into direct contact with the ceiling board by installing the dynamic damper on the upper surface of the ceiling board. Thus, unlike the conventional case where the damper is fixed to the ceiling board via another member, it is possible to prevent the natural period of the damper from deviating from that before fixing. Therefore, according to the said ceiling, the reduction effect of the outstanding floor impact sound can be acquired.

  ADVANTAGE OF THE INVENTION According to this invention, the dynamic damper excellent in the workability | operativity at the time of the installation to a ceiling and the reduction effect of a floor impact sound, and a ceiling provided with the same can be provided.

It is a perspective view which shows the structure of the ceiling which concerns on Embodiment 1 of this invention. It is an enlarged view of the area | region II in FIG. It is a side view which shows the structure of the dynamic damper which concerns on Embodiment 1 of this invention. It is a perspective view which shows the structure seen from the upper direction of the ceiling which concerns on Embodiment 2 of this invention. It is a perspective view which shows the structure seen from the downward direction of the ceiling which concerns on Embodiment 2 of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Embodiment 1]
(ceiling)
First, the structure of the ceiling 10 according to the first embodiment of the present invention will be described with reference to FIGS. The ceiling 10 includes a plurality of floor beams 4, a field edge 2 and a field edge receiver 3, a ceiling board 5, and a dynamic damper 1.

  The floor beam 4 is for supporting the floor of the upper floor, and is a steel structural material extending in one direction. The floor beam 4 has a pair of flat flanges 4A and 4B and a flat web 4C connecting them. The flanges 4A and 4B are parallel to each other, the web 4C is orthogonal to the flanges 4A and 4B, and one end is connected to the lower surface of the flange 4A and the other end is connected to the upper surface of the flange 4B. As shown in FIG. 1, the floor beams 4 are arranged in parallel in a predetermined arrangement direction at intervals.

  The field edge 2 is a rectangular column-shaped elongated structural material provided with a hollow portion. As shown in FIG. 1, the field edges 2 are arranged parallel to each other in the arrangement direction D <b> 1 orthogonal to the arrangement direction of the floor beams 4. Two adjacent field edges 2 have inner surfaces 2A that face each other in the arrangement direction D1.

  The field edge receiver 3 is a U-shaped elongated structural material opened on one side, and is disposed on the upper surface of the field edge 2. As shown in FIG. 1, the field edge receiver 3 is orthogonal to the field edge 2 and is assembled to the field edge 2 in a lattice shape. The field edge receiver 3 has a pair of flat flanges 3A and 3B and a flat web 3C that connects one end of these flanges. The flanges 3A and 3B are parallel to each other, and the web 3C is orthogonal to the flanges 3A and 3B. As shown in FIG. 1, the field edge receiver 3 is arranged in parallel with the floor beam 4 with the opening portion facing the floor beam 4 side. A fixture 22 is provided on the flange 4B of the floor beam 4, and the field receiver 3 is fixed to the fixture 22 by a bolt 21 that penetrates the flange 3A.

  The ceiling board 5 is composed of a gypsum board, and is fixed to the lower surfaces of both adjacent field edges 2 as shown in FIG. 3 (right figure). The ceiling board 5 is fixed to the lower surface of the field edge 2 at a portion having a width larger than the interval W2 between the adjacent field edges 2 and protruding outward from the inner surface 2A of the field edge 2. The ceiling board 5 has an upper surface 5A on which the dynamic damper 1 is placed.

  The dynamic damper 1 is for reducing the floor impact sound transmitted from the upper floor, and a plurality of the dynamic dampers 1 are arranged so as to straddle two adjacent field edges 2 as shown in FIG. As shown in FIG. 1, the dynamic dampers 1 are arranged in a row in the arrangement direction D1, and are arranged at intervals in a direction orthogonal to the arrangement direction D1. The dynamic damper 1 is placed on the upper surface 5A of the ceiling board 5 as shown in FIG. The structure of the dynamic damper 1 will be described in detail later.

(Dynamic damper)
Next, the detailed structure of the dynamic damper 1 will be described with reference to FIGS. FIG. 2 is an enlarged view of region II in FIG. 1. The left side shows a view of the dynamic damper 1 as viewed from above, and the right side shows a view as viewed from below. FIG. 3 shows the structure of the dynamic damper 1, the left side shows a state before the ceiling board 5 is fixed, and the right side shows the state after the ceiling board 5 is fixed. The dynamic damper 1 includes a mass body 11 and a support body 12 connected to the mass body 11.

  The mass body 11 is a portion that functions as a weight of the dynamic damper 1, and has an upper surface 11C and a lower surface 11B. The mass body 11 is made of a recyclable gypsum board, and is a rectangular plate member having a longitudinal width W1 and a lateral width W5. The mass body 11 has a first end portion 11A that is one end portion in the longitudinal direction and a second end portion 11D that is the other end portion. The second end portion 11D is disposed at an interval equal to or greater than the interval W2 between the two field edges 2 adjacent to the first end portion 11A. That is, the width W1 in the longitudinal direction of the mass body 11 is larger than the interval W2 between the two field edges 2.

  The support body 12 has a width smaller than the interval W2 between the adjacent two edge portions 2, and is connected to the lower surface 11B between the first end portion 11A and the second end portion 11D and supports the mass body 11. . The support 12 includes a plurality (two) of elastic bodies 14 and a plurality (two) of restraining members 13 connected to the lower end of the elastic body 14. As shown in FIG. 3, the support bodies 12 are arranged away from each other in the direction from the first end portion 11A toward the second end portion 11D (arrangement direction D1).

  The elastic body 14 is a rubber body that can be elastically deformed according to the vibration of the ceiling, and is connected to the lower surface 11B with a space therebetween. More specifically, the elastic body 14 is fixed to the mass body 11 by a bolt 15 penetrating the mass body 11 in the thickness direction and a nut disposed on the upper surface 11C.

  The restraining member 13 is a plate-like member having a width larger than that of the elastic body 14. As shown in FIG. 2 (right figure), the restraining member 13 has a rectangular shape, the width in the short direction is substantially the same as that of the mass body 11, and the length in the longitudinal direction is smaller than that of the mass body 11. It has become.

  The restraining member 13 has an upper surface 13B connected to the lower end portion of the elastic body 14, a lower surface 13A, and a side surface 13C that connects the upper surface 13B and the lower surface 13A. The lower surface 13A is a mounting surface that is mounted on the upper surface 5A of the ceiling board 5 as shown in FIG. 3 (right diagram). The side surface 13C is a facing surface that faces the inner surface 2A of the field edge 2 in the arrangement direction D1.

  The height dimension W3 between the mounting surface 13A and the lower surfaces 11B of the first and second end portions 11A and 11D is larger than the height dimension W4 of the field edge 2. Therefore, as shown in FIG. 3 (left figure), when the first and second end portions 11A and 11D are hooked on the upper surface of the field edge 2, the placement surface 13A is positioned below the lower surface of the field edge 2. To do. Thereby, the upper surface 5A of the ceiling board 5 can be brought into contact with the placement surface 13A.

  A thickness T1 of the restraining member 13 is larger than a distance W7 obtained by subtracting the height dimension W4 from the height dimension W3. Therefore, as shown in FIG. 3 (left figure), the restraining member 13 faces the inner surface 2A of the field edge 2 in a state where the first and second end portions 11A and 11D are hooked on the upper surface of the field edge 2.

  Further, the facing surface 13C is provided at a position above the placement surface 13A and at a position separated from the lower surface 11B of the first and second end portions 11A and 11D by a predetermined height distance W6. The height distance W6 is larger than the distance W7 obtained by subtracting the height dimension W4 from the height dimension W3. As shown in FIG. 3 (right figure), the distance W7 is equal to the distance between the mass body 11 and the field edge 2 in a state where the ceiling board 5 is fixed to the lower surface of the field edge 2. Therefore, by making the height distance W6 larger than the distance W7, the facing surface 13C faces the inner surface 2A of the field edge 2 in a state where the ceiling board 5 is fixed.

(Installation of dynamic damper)
Next, the installation procedure of the dynamic damper 1 will be described with reference to FIG.

  First, the dynamic damper 1 is lifted so as to pass through the gap between the two field edges 2 so that the first and second end portions 11A and 11D are hooked on the upper surface of the field edge 2 as shown in FIG. Will be temporarily installed.

  In this temporarily installed state, the support 12 (the elastic body 14 and the restraining member 13) is positioned between the two field edges 2. Further, since the width W1 in the longitudinal direction of the mass body 11 is larger than the interval W2 between the two field edges 2, the first and second end portions 11A and 11D are located outside the inner surface 2A of the field edge 2 in the arrangement direction D1. Projects by lengths L1 and L2. At this time, the length L1 (projection length) at which the first end portion 11A protrudes from the inner surface 2A of one field edge 2 to the outside in the arrangement direction D1 is between the inner surface 2A of the other field edge 2 and the opposing surface 13C. The length L2 (projection length) at which the second end 11D protrudes from the inner surface 2A of the other field edge 2 to the outside in the arrangement direction D1 is larger than the gap L4 in the arrangement direction D1 between It is larger than the gap L3 in the arrangement direction D1 between the inner surface 2A of the field edge 2 and the opposing surface 13C. Therefore, when the position of the damper is shifted laterally in the temporary installation state, the facing surface 13C and the inner surface 2A of the field edge 2 collide, and the first and second end portions 11A and 11D are engaged with the field edge 2. Therefore, the damper can be prevented from dropping during construction.

  In addition, since the height dimension W3 between the lower surface 11B of the first and second end portions 11A and 11D and the placement surface 13A is larger than the height dimension W4 of the field edge 2, the placement surface 13A is the field edge 2. It is located below the lower surface of. Therefore, the ceiling board 5 can be easily brought into contact with the placement surface 13A.

  Next, as shown in FIG. 3 (right diagram), the dynamic damper 1 is lifted upward by bringing the upper surface 5A of the ceiling board 5 into contact with the placement surface 13A and moving the ceiling board 5 upward. And the installation of the dynamic damper 1 is completed by fixing the both ends of the ceiling board 5 to the lower surface of the field edge 2. At this time, since the restraining member 13 is opposed to the inner surface 2A of the field edge 2 in the arrangement direction D1, and is not positioned outside the arrangement direction D1 with respect to the inner surface 2A of the field edge 2, It is possible to prevent a damper from being sandwiched between the lower surface of the field edge 2. The dynamic damper 1 is supported in a state where it is placed on the upper surface 5A without being fixed to the ceiling board 5, and the lower surface 11B of the first and second end portions 11A, 11D is made to have a field edge 2 by lifting the ceiling board 5. It will be in the state away from the upper surface. Thereby, the mass body 11 can be vibrated according to the vibration of the ceiling board 5.

  In the installation completed state, the facing surface 13C faces the inner surface 2A of the field edge 2 as shown in FIG. Similarly to the temporary installation state, the length L1 at which the first end portion 11A projects from the inner surface 2A of one field edge 2 to the outside in the arrangement direction D1 is between the inner surface 2A of the other field edge 2 and the opposing surface 13C. The length L2 of the second end 11D protruding from the inner surface 2A of the other field edge 2 to the outside in the arrangement direction D1 is larger than the gap L4 in the arrangement direction D1 of It is larger than the gap L3 in the arrangement direction D1 with respect to 13C. Thereby, even when the position of the damper is shifted in the lateral direction, the state where the first and second end portions 11A and 11D are opposed to the upper surface of the field edge 2 is maintained. Therefore, even when the ceiling board 5 is cracked, the first and second end portions 11A and 11D are hooked on the upper surface of the field edge 2, so that the damper can be prevented from falling. As described above, the installation of the dynamic damper 1 is completed.

(Function and effect)
Next, a characteristic configuration and operational effects of the dynamic damper 1 will be described.

  The dynamic damper 1 includes a mass body 11 having a first end portion 11A, and a second end portion 11D disposed at a distance equal to or greater than a distance W2 between both edge edges 2 with respect to the first end portion 11A, and a ceiling. An elastically deformable support 12 having a mounting surface 13A mounted on the board 5. The height dimension W3 between the lower surface 11B of the first and second end portions 11A and 11D and the placement surface 13A is larger than the height dimension W4 of the field edge 2.

  As shown in FIG. 3 (left figure), the dynamic damper 1 can be temporarily installed such that the first and second end portions 11 </ b> A and 11 </ b> D are hooked on the upper surface of the field edge 2. At this time, since the height dimension W3 between the lower surface 11B of the first and second end portions 11A and 11D and the placement surface 13A is larger than the height dimension W4 of the field edge 2, the placement surface 13A is a field edge. It is located below the lower surface of 2. Then, as shown in FIG. 3 (right figure), the ceiling board 5 is lifted and the ceiling board 5 is fixed to the two field edges 2 from below. In the process, the damper is lifted with the placement surface 13A placed on the ceiling board 5. In this way, fixing the ceiling board 5 to the field edge 2 completes the installation of the damper. As described above, the dynamic damper 1 does not need to be fixed to the field edge receiver 3 just by being hung across both adjacent field edges 2, and it is not necessary to fix it to the ceiling board 5 in advance. Is excellent.

  Further, the dynamic damper 1 is placed on the upper surface 5A of the ceiling board 5 in the installation completion state, and the first and second end portions 11A and 11D of the mass body 11 are separated from the upper surface of the field edge 2. Thereby, the mass body 11 can be vibrated and the effect | action as a damper is acquired. Here, since the dynamic damper 1 is disposed in a state of being in direct contact with the upper surface 5A of the ceiling board 5, the natural period of the damper is prevented from deviating from that before fixing, and the reaction force of the damper is applied to the ceiling board 5. Can communicate efficiently.

  As shown in FIG. 3 (left figure), the dynamic damper 1 is arranged such that the first end portion 11A protrudes from the inner surface 2A of one field edge 2 to the outside in the arrangement direction D1 by a predetermined length L1. The opposite surface 13C is disposed on the inner side in the arrangement direction D1 with a gap L4 smaller than the protrusion length L1 with respect to the inner surface 2A of the other field edge 2. Further, when the second end portion 11D is arranged so as to protrude from the inner surface 2A of the other field edge 2 to the outside of the arrangement direction D1 by a predetermined length L2, the second end portion 11D It has the opposing surface 13C arrange | positioned inside the arrangement | sequence direction D1, leaving the clearance gap L3 smaller than protrusion length L2. Thereby, even when the position of the damper is shifted laterally in the temporary installation state shown in FIG. 3 (left figure), the opposing surface 13C collides with the inner surface 2A of the field edge 2, thereby the first and second end portions. The state where 11A and 11D protrude from the field edge 2 is maintained. Therefore, since the state where the mass body 11 is hung on both the field edges 2 is maintained, the damper can be prevented from falling during construction.

  In the dynamic damper 1, the facing surface 13C is provided at a position above the mounting surface 13A and at a position separated by a predetermined height distance W6 from the lower surface 11B of the first and second end portions 11A and 11D. Yes. The height distance W6 is larger than a distance W7 obtained by subtracting the height dimension W4 of the field edge 2 from the height dimension W3 between the lower surface 11B of the first and second end portions 11A and 11D and the placement surface 13A. It has become. As shown in FIG. 3 (right figure), when the ceiling board 5 is fixed to the lower surface of the field edge 2, the mass body 11 is separated from the field edge 2 by a distance W7. Therefore, by making the height distance W6 larger than the distance W7, the facing surface 13C can be opposed to the inner surface 2A of the field edge 2 even when the ceiling board 5 is fixed. Thereby, even when the ceiling board 5 is cracked, the damper can be prevented from falling.

  In the dynamic damper 1, the support 12 includes an elastically deformable elastic body 14 connected to the mass body 11, and a restraining member 13 connected to the elastic body 14 and having a facing surface 13 </ b> C. Thereby, the position of the opposing surface 13 </ b> C can be adjusted by the size and arrangement of the restraining member 13 while giving the elastic body 14 the function of deforming according to the vibration of the ceiling board 5. Therefore, there is an advantage that the design of the elastic body 14 does not need to be changed even when the position of the facing surface 13C is adjusted, and the period of the damper does not change.

  In the dynamic damper 1, the support 12 has a width that is smaller than the distance W <b> 2 between the two field edges 2. The restraining member 13 is connected to the lower end portion of the elastic body 14 and has a facing surface 13C (side surface) and a placement surface 13A (lower surface). The thickness T1 of the restraining member 13 is greater than a distance W7 obtained by subtracting the height dimension W4 of the field edge 2 from the height dimension W3 between the lower surface 11B of the first and second end portions 11A and 11D and the placement surface 13A. It is getting bigger.

  Thereby, in the temporary installation state in which the first and second end portions 11A and 11D are hung on the upper surface of the field edge 2 (the left figure in FIG. 3), the support 12 is positioned between the field edges 2 and restrained. The member 13 can be opposed to the field edge 2. Therefore, even when the position is shifted in the horizontal direction when the damper is lifted by the ceiling board 5, the restraining member 13 and the field edge 2 collide, so that the damper is sandwiched between the ceiling board 5 and the lower surface of the field edge 2. Can be prevented. Thereby, the problem of unevenness of the ceiling board 5 can be avoided.

  In the dynamic damper 1, the mass body 11 is made of gypsum. As shown in FIG. 1, the dynamic damper 1 can be installed in a planar shape so as to straddle both field edges 2 in a portion close to the ceiling surface of the ceiling pocket, so that a wide area can be secured. Therefore, even when a material having a small specific gravity is used for the mass body 11, it is possible to secure a weight necessary for functioning as a damper. Therefore, in the dynamic damper 1, cost can be reduced by using recyclable gypsum as a constituent material of the mass body 11.

[Embodiment 2]
Next, a dynamic damper 1A according to Embodiment 2 of the present invention and a ceiling 10A including the same will be described with reference to FIGS.

  The dynamic damper 1 </ b> A includes a mass body 31 and a plurality (four) of support bodies 32 connected to the mass body 31. Each of the support bodies 32 includes an elastic body 34 and a restraining member 35 connected to the elastic body 34. In the second embodiment, the width in the short side direction D2 (the direction perpendicular to the direction from the first end to the second end) of the mass body 31 is larger than that of the mass body 11 in the first embodiment. The support bodies 32 are arranged apart from each other in the short side direction D2, and are arranged apart from each other in the longitudinal direction D1 (direction from the first end portion to the second end portion). That is, the support body 32 is connected to the four corners of the mass body 31 as shown in FIG.

  Thus, by increasing the width of the mass body 31 in the short side direction D2, the area of the mass body 31 can be further increased. Therefore, even when gypsum or the like, which has a lower density than iron and is inexpensive, is used as a constituent material of the mass body 31, a weight necessary for functioning as a damper can be ensured. Further, by disposing the plurality of support bodies 32 apart from each other in the short side direction D2, even when the width in the short side direction D2 is increased as described above, the mass body 31 is stably supported by the plurality of support bodies 32. be able to. Further, by providing the support bodies 32 at the four corners of the mass body 31, each support body 32 can be positioned near the field edge 2, and the above-described effect of preventing the damper from falling can be obtained by each support body 32. .

(Other embodiments)
In the above embodiment, the height dimension W3 between the lower surface 11B of the first end portion 11A and the placement surface 13A, and the height dimension W3 between the lower surface 11B of the second end portion 11D and the placement surface 13A, Are the same, but are not limited thereto, and the two may be different.

  In the above embodiment, the case where the protruding length L1 of the first end portion 11A is larger than the gap L4 and the protruding length L2 of the second end portion 11D is larger than the gap L3 is not limited to this. The magnitude relationship may be reversed.

  Although the said embodiment demonstrated the case where the support body 12 was comprised with the elastic body 14 and the restraint member 13, it is not limited to this, The restraint member 13 may be abbreviate | omitted.

  Although the case where the mass body 11 consists of a gypsum board was demonstrated in the said embodiment, it is not limited to this, You may be comprised by the member which consists of other materials, such as an iron plate.

  It should be understood that the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1,1A Dynamic damper 2 Field edge 5 Ceiling board 5A Upper surface 10, 10A Ceiling 11,31 Mass body 11A 1st edge part 11D 2nd edge part 12 Support body 13 Restriction member 13A Mounting surface (lower surface)
13C Opposite surface (side surface)
14 Elastic body D1 Arrangement direction L1, L2 Projection length L3, L4 Gap W2 Gap

Claims (9)

A dynamic damper installed on a ceiling, comprising two field edges arranged at intervals in a predetermined arrangement direction, and a ceiling board fixed to the lower surface of both field edges,
A mass body having a first end portion and a second end portion disposed at an interval equal to or greater than an interval between both field edges with respect to the first end portion;
At least one elastically deformable that is connected to the mass body between the first end portion and the second end portion and has a placement surface placed on the upper surface of the ceiling board and supports the mass body One support, and
The height dimension between the lower surface of the first end and the placement surface and the height dimension between the lower surface of the second end and the placement surface are higher than the height of the field edge. Large dynamic damper.   When the first end portion is disposed so as to protrude from the inner surface of one field edge to the outside in the arrangement direction by a predetermined length, a gap smaller than the protrusion length with respect to the inner surface of the other field edge The dynamic damper according to claim 1, further comprising an opposing surface disposed inside the arrangement direction with a gap therebetween. The opposed surface is provided at a position above the placement surface and at a position separated from the lower surface of the first end portion by a predetermined height distance,
3. The dynamic damper according to claim 2, wherein the height distance is larger than a distance obtained by subtracting the height dimension of the field edge from the height dimension between the lower surface of the first end portion and the placement surface. The support is
An elastically deformable elastic body connected to the mass body;
The dynamic damper according to claim 2, further comprising a restraining member connected to the elastic body and having the facing surface. The support has a width smaller than the distance between the two edges;
The restraining member is connected to a lower end portion of the elastic body, and has a side surface that is the facing surface and a lower surface that is the mounting surface.
5. The dynamic damper according to claim 4, wherein a thickness of the restraining member is larger than a distance obtained by subtracting a height dimension of the field edge from a height dimension between the lower surface of the second end portion and the placement surface. .   The dynamic damper according to claim 1, wherein the mass body is made of gypsum.   The dynamic damper according to any one of claims 1 to 6, further comprising a plurality of the support bodies arranged apart from each other in a direction from the first end portion toward the second end portion.   The dynamic damper according to any one of claims 1 to 7, comprising a plurality of the support bodies arranged apart from each other in a direction orthogonal to a direction from the first end portion to the second end portion. Two field edges arranged at intervals from each other in a predetermined arrangement direction;
A ceiling board fixed to the lower surface of the edge,
The ceiling provided with the dynamic damper of any one of Claims 1-8 installed in the upper surface of the said ceiling board.

Images