JP2006077517A - Ceiling structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ceiling structure capable of obtaining good noise insulating performance at a low cost against impact noise resulted from a heavy floor. <P>SOLUTION: The ceiling structure comprises beams 1 as the basic members of the ceiling; a plurality of cradlings 2 etc. supported from the beams 1 by means of suspension members 3; ceiling panels 4 fixed to the bottom surface of the cradlings 2 etc.; and a plurality of dynamic dampers 5 are arranged at the cradling 2 etc. having a total weight almost equal to one third to one fifth of the weight of the floor laid above. In this way, the total mass of the dynamic dampers 5 etc. required for fully exerting an effect of reducing the impact noise resulted from the heavy floor above can be decreased thereby realizing a lower cost for building the ceiling structure. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a ceiling structure of a building structure such as a general house or an apartment house (apartment or apartment).

  In general homes and the like, vibration is generated when an impact is caused by jumping on the floor or descending from a platform, which causes problems such as unpleasant noise and unpleasant vibration. In particular, in multi-storey detached houses and condominiums, vibrations and impact sounds generated in the floors of living rooms and corridors are directly transmitted to the downstairs, which may be a significant noise for downstairs residents. .

  Therefore, various measures have been taken in the past in order to suppress vibrations and impact sounds generated on the floor of ordinary houses and the like. For example, as disclosed in Patent Documents 1 and 2, there are countermeasures against floor impact sounds. The floor structure taken is known. Patent Document 1 discloses a floor structure in which a weight is attached to a predetermined portion of a ceiling suspension tree, and Patent Document 2 discloses a floor in which a weight is attached to a ceiling suspension tree corresponding to a portion where the vibration of the floor structure is large. A structure is disclosed.

  Further, as disclosed in, for example, Patent Documents 3 to 5, a rubber elastic body (spring member) and a mass member (mass body) elastically supported by the spring member are provided, and vibration generated on the floor or a heavy floor 2. Description of the Related Art A dynamic damper type vibration damping device for a house installed on a beam or joist to reduce impact noise is known.

  By the way, in the process of studying countermeasures for heavy floor impact sound, the present applicant has installed a dynamic damper at a predetermined location on a floor material composed of a plurality of floor panels arranged in parallel, thereby allowing heavy floor impact. It was found that the sound insulation performance of the floor can be improved by one rank by reducing the sound by 5 dB, and has been proposed previously. On the other hand, it is known that the method of increasing the weight of the floor is effective as a measure for improving the sound insulation performance of the floor, and it is advantageous to increase the weight of the floor material also in the case of the above-mentioned proposed method. .

However, in the proposed method, in order to sufficiently exert the effect of reducing the heavy floor impact sound, the total mass of mass members used for the dynamic damper is required to be about 13% of the total mass of the floor material. The number of dynamic dampers increases, which tends to incur high costs.
Japanese Patent No. 2518961 Japanese Patent No. 2552762 Japanese Patent Laid-Open No. 2004-3280 JP 2003-278409 A JP 2000-355994 A

  This invention is made | formed in view of the said actual condition, and makes it the subject which should be solved to provide the ceiling structure which was able to obtain the favorable sound-insulation performance of a heavy floor impact sound at low cost.

  The present invention that solves the above-mentioned problems is a ceiling comprising a ceiling base material, a plurality of field edges that are supported by the ceiling base material and arranged in parallel, and a ceiling panel that is fixed to the lower surface of the field edge. The structure is characterized in that a dynamic damper is installed at the field edge.

  In the ceiling structure of the present invention, when an impact due to jumping or descending from a step is applied to the floor of the upper floor to generate vibration or impact sound, the vibration or impact sound is composed of a lower floor field edge, a ceiling panel, or the like. It is transmitted to the ceiling and the ceiling also vibrates. At this time, the vibration of the ceiling is effectively attenuated by resonating with the dynamic damper installed at the field edge, and the heavy floor impact sound propagated to the lower floor is effectively reduced.

  In the case of the present invention, a dynamic damper is installed at the ceiling edge where the weight is about 1/3 to 1/5 of the floor, so that the effect of reducing the heavy floor impact sound can be fully exhibited. The total mass of necessary mass members of the dynamic damper can be reduced. Therefore, the number of installed dynamic dampers can be reduced, and the size of each dynamic damper can be reduced, so that the cost can be reduced. As a result, it is possible to obtain a weight floor impact sound reduction effect equivalent to the case where a dynamic damper is installed on the floor at low cost.

  The dynamic damper used in the present invention is composed of a spring member fixed to a base and a mass member elastically supported by the spring member. The dynamic dampers are preferably installed in a state of being distributed substantially evenly at a plurality of locations on the lower surface of the field edge, and one or more dynamic dampers are installed at one location. When a plurality of dynamic dampers are installed at one place, one vibration damping device having a plurality of dynamic dampers may be installed at one place. When such a vibration damping device is employed, tuning can be performed to have a plurality of types of resonance frequencies by a plurality of dynamic dampers.

  The resonance frequency of the dynamic damper is preferably tuned to a range of 63 Hz band (45 to 90 Hz) in accordance with the natural value of the ceiling composed of a field edge, a ceiling panel and the like. In this way, the dynamic damper can be effectively functioned, so that it is possible to expect a better reduction in heavy floor impact sound. In addition, by tuning so that the resonance frequency of the dynamic damper is different at one or more installation locations, a plurality of types of resonance frequencies can be set in the range above and below the ceiling eigenvalue. In this way, it is possible to provide a range of frequencies intended for vibration reduction, so it is possible to absorb variations in ceiling eigenvalues due to differences in structural properties, etc., and the vibration reduction function of the dynamic damper is more reliably achieved. It can be demonstrated.

  The ceiling base material in the present invention is intended for the upper part of the beam that supports the floor on the upper floor and the inner wall that is disposed below the beam and defines the room on the lower floor. Moreover, arbitrary things, such as metal and a wooden thing, are employable as a field edge. Moreover, a ceiling panel can be suitably selected from what was used conventionally, such as a gypsum board and a plywood, for example, and can be employ | adopted.

  In the ceiling structure of the present invention, since dynamic dampers are installed at a plurality of field edges supported in parallel by the ceiling base material, it is possible to obtain good sound insulation performance of heavy floor impact sound at low cost. Can be.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of the ceiling structure according to the present embodiment, and is a cross-sectional view taken along the line II of FIG. 2, and FIG. 2 is a plan view of the ceiling structure.

  As shown in FIGS. 1 and 2, the ceiling structure of the present embodiment includes a beam 1 as a ceiling base material and a plurality of field edges 2 that are supported on the beam 1 via suspension members 3 and arranged in parallel. ,..., 2 and the field edge 2,... 2, the ceiling panel 4 fixed to the lower surface of the field edge 2, 2, and a plurality of dynamic dampers 5,. Yes.

  The beam 1 is made of H-shaped steel, and is composed of two vertical beams 1a and 1b, two horizontal beams 1c and 1e connecting the ends of the vertical beams 1a and 1b, and one horizontal beam connecting the central portions. 1d. The vertical beams 1a and 1b and the horizontal beams 1c and 1e located on the outer periphery of the beam 1 are assembled in a rectangular shape with their both ends fixed by bolts (not shown) or the like. Moreover, both ends of the horizontal beam 1d located at the center of the beam 1 are fixed to the central portions of the vertical beams 1a and 1b with bolts (not shown) or the like.

  As shown in FIG. 1, a floor panel 12 made of lightweight cellular concrete (ALC) and a surface finishing material 13 are disposed on the beam 1 as a floor material for forming an upper floor. In addition, an inner wall 15 is provided below the vertical beams 1a and 1b and the horizontal beams 1c and 1e assembled in a rectangular shape. On the inner surface of the ceiling portion of the inner wall 15 disposed below the horizontal beams 1c and 1e, a U-shaped fixing bracket 16 having a U-shaped cross section for fixing and holding the ends of the field edges 2,.

  Nine metal square pipes are employed for the field edges 2,..., 2 and are arranged in parallel with a predetermined distance from each other in parallel with the longitudinal beams 1a, 1b. Both end portions of each of the field edges 2,... 2 are fixed and supported by a fixing bracket 16 provided on the inner surface of the ceiling portion of the inner wall 15 with bolts (not shown). Moreover, the center part of each field edge 2, ... 2 is suspended and supported via the suspension member 3 which consists of the field edge receiver 3a attached to the lower end of the horizontal beam 1d, and the suspension metal fitting 3b. A ceiling panel 4 made of gypsum board or the like is fixed to the lower surfaces of the field edges 2... 2 with an adhesive, screws (not shown) or the like.

  In addition, the weight of the ceiling comprised by the field edges 2, ... 2, the suspension member 3, and the ceiling panel 4 is about 200 kg, and is 1/4 of the weight of the floor comprised by the floor panel 12 and the surface finishing material 13. It is about.

  As shown in FIGS. 3 and 4, the dynamic dampers 5,..., 5 are elastically supported by a cylindrical rubber elastic body (spring member) 5a fixed to the base portion 6a of the mounting bracket 6 and the rubber elastic body 5a. It is a compression type dynamic damper in which the rubber elastic member (spring member) 5a is compressed and tensile deformed when vibration or the like is generated on the floor. The resonance frequencies of the dynamic dampers 5,..., 5 are tuned to a 63 Hz band (45 to 90 Hz) so as to have a plurality of types of resonance frequencies in the range above and below the ceiling eigenvalue.

  The mounting bracket 6 used here includes a planar base portion 6a and a pair of side portions 6b bent at both ends of the base portion 6a, and has a substantially U-shaped cross section. As shown in FIG. 4, each side portion 6 b is associated with a stepped portion 2 a formed at the upper end of both side surfaces of the field edge 2 when the base portion 6 a of the mounting bracket 6 is mounted on the upper surface of the field edge 2. In combination, a stopper portion 6c is provided to prevent escape from the field edge 2.

  The dynamic dampers 5,..., 5 are attached to the field edges 2,... 2 via the mounting bracket 6, and as shown in FIG. A total of 56 are installed for each of the field edges 2. In this case, 28 beams are respectively provided for the range of the beam protuberance A composed of the longitudinal beams 1a, 1b and the transverse beams 1c, 1d and 28 for the range of the beam protuberance B composed of the longitudinal beams 1a, 1b and the transverse beams 1d, 1e. The dynamic dampers 5,..., 5 are installed in a state of being distributed substantially evenly at a predetermined distance (330 mm).

  As shown in FIGS. 5 and 6, the dynamic dampers 5,..., 5 have a cylindrical rubber elastic member (fixed to the side surface of the base 6a of the mounting bracket 6 in an L shape. And a cylindrical mass which is elastically supported by the rubber elastic member (spring member) 5a in a cantilever manner so that the rubber elastic member (spring member) 5a undergoes shear deformation when vibration or the like occurs on the floor. A shear type dynamic damper composed of the member (mass body) 5b may be used. The shape of the mounting bracket 6 and the mounting structure of the mounting bracket 6 to the field edge 2 are the same as those in the embodiment of the compression type dynamic damper.

  In the ceiling structure of the present embodiment configured as described above, the floor of the upper floor composed of the floor panel 12 and the surface finishing material 13 is subjected to impacts such as jumping or descending from a stepping plate, and vibrations and impact sounds are generated. When generated, the vibration and impact sound are transmitted to the ceiling of the lower floor constituted by the field edges 2,..., The field edge receiver 3a, the suspension fitting 3b, and the ceiling panel 4, and the ceiling also vibrates. At this time, the dynamic dampers 5,... 5 installed in the field edges 2... 2 resonate with the field edges 2. The heavy floor impact sound is effectively reduced.

  In the case of the ceiling structure of the present embodiment, since the dynamic dampers 5,..., 5 are installed on the ceiling edges 2,. It is possible to reduce the total mass of the mass members 52 of the dynamic dampers 5,... 5 necessary for sufficiently exhibiting the sound reduction effect. Therefore, the cost is reduced by reducing the number of installed dynamic dampers 5,..., 5 or by reducing the size of each of the dynamic dampers 5,. Thereby, the reduction effect of the heavy floor impact sound equivalent to the case where the dynamic dampers 5... 5 are installed on the floor can be obtained at low cost.

  As described above, according to the ceiling structure of the present embodiment, the dynamic dampers 5,... 5 are installed on the plurality of field edges 2,. Therefore, it is possible to obtain a good sound insulation performance of the heavy floor impact sound at a low cost.

It is sectional drawing of the ceiling structure which concerns on embodiment of this invention, Comprising: It is the II sectional view taken on the line of FIG. It is a top view of the ceiling structure which concerns on embodiment of this invention. It is a front view of a dynamic damper used in an embodiment of the present invention. It is a perspective view which shows the state in which the dynamic damper used in embodiment of this invention was attached to the field edge. It is a front view of the dynamic damper used in another embodiment of the present invention. It is a perspective view which shows the state in which the dynamic damper used in another embodiment of this invention was attached to the field edge.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Beam 1a, 1b ... Vertical beam 1c, 1d, 1e ... Horizontal beam 2 ... Field edge 2a ... Step part 3 ... Hanging member 3a ... Field edge receiver 3b ... Hanging metal fitting 4 ... Ceiling panel 5 ... Dynamic damper 5a ... Rubber elastic body 5b ... Mass member 6 ... Mounting bracket 6a ... Base 6b ... Side 6c ... Stopper 12 ... Floor panel 13 ... Surface finish 15 ... Inner wall 16 ... Fixing bracket

Claims (5)

In a ceiling structure comprising a ceiling base material, a plurality of field edges supported in parallel by the ceiling base material, and a ceiling panel fixed to a lower surface of the field edge,
A ceiling structure, wherein a dynamic damper is installed on the edge.   The ceiling structure according to claim 1, wherein the dynamic damper is installed at a plurality of locations on the edge.   The ceiling structure according to claim 1 or 2, wherein at least one dynamic damper is installed at one place.   The ceiling structure according to claim 1, wherein the dynamic damper is tuned so that a resonance frequency is different at one or more installation locations. The ceiling structure according to claim 1, wherein the dynamic damper is tuned to a resonance frequency of 45 to 90 Hz.

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