JP2017036549A - Ceiling structure - Google Patents

Abstract

To provide a practical ceiling structure capable of reducing a heavy floor impact sound by using a vibration damping body that is as light as possible. A ceiling structure includes a floor structure, a ceiling plate connected to the floor structure, and a vibration damping body placed on the ceiling plate. The damping body 10 is arranged so that the weight per 1 m 2 is 80% or more of the weight of the ceiling plate 4 per 1 m 2. The damping body 10 includes a damping material 11 and a bag body 12 that houses the damping material 11. [Selection] Figure 2

Description

  The present invention relates to a ceiling structure, and more particularly to a ceiling structure using a vibration control body that reduces floor impact sound that propagates from the upper floor to the lower floor of a building.

  In a multi-storey building such as a condominium apartment, a floor structure on an upper floor and a ceiling board on a lower floor are connected to each other via a hanging bolt or a ceiling base.

  In such a ceiling structure, the floor impact sound easily propagates from the floor structure to the ceiling board. The floor impact sound is a sound that is observed in the lower-floor room by generating a vibration with a wide frequency component according to the weight and softness of the object to be impacted and propagating.

  Of these, those caused by the impact of heavy and soft objects such as jumping, running, walking, etc. are called heavy floor impact sounds, and those caused by the impact of light and hard objects such as chair dragging or dropping a spoon are called lightweight floor impact sounds.

  In many cases, the heavy floor impact sound has a 63 Hz band, and the light floor impact sound has a 125 Hz or 250 Hz band as a performance determination frequency.

  Since such floor impact sound, particularly heavy floor impact sound, is unpleasant noise for the occupants of the lower floor, conventionally, many countermeasures for reducing the floor impact sound have been proposed.

  For example, Patent Literature 1 discloses a ceiling structure having a vibration damping body arranged across a field edge. The vibration damping body has a bag and a granular material accommodated in the bag. As the granular material, pearlite, sand, natural glass foam or a mixture selected from at least two of them is used.

JP 2014-37678 A

  The floor impact sound is mainly caused by solid propagation sound that propagates from the floor structure to the ceiling board via the connecting member. On the other hand, in order to absorb the solid propagation sound, it is important to increase the specific gravity of the damping material and increase the weight of the entire damping body. On the other hand, in view of the strength of the ceiling board and a practical viewpoint in construction, there is a high practical demand to determine the lower limit of the weight of the damping body necessary for reducing the heavy floor impact sound.

  However, in the past, research has been conducted on the material of the damping material exclusively for the absorption of solid-borne sound, and sufficient research has not been done on the lower limit weight that can effectively improve the sound insulation class. It was. Therefore, based on the conventional research results, the tendency to adopt an excessively heavy damping body has increased, and it has become necessary to apply a large load to the ceiling panel, resulting in poor practicality.

  This invention makes it a subject to provide the practical ceiling structure which can reduce a heavy floor impact sound using the damping body as light as possible in view of the said viewpoint.

In order to solve the above problems, the present invention includes a floor structure, a ceiling plate coupled to the floor structure, and a vibration damping body placed on the ceiling plate, and the vibration damping The body is a ceiling structure characterized in that at least a weight per 1 m ² is 80% or more of a weight of the ceiling board per 1 m ² . In this aspect, when placing the damping body to absorb the solid-propagating sound that can propagate from the floor structure to the ceiling plate, the weight floor impact sound is reduced with the damping body of the minimum necessary weight. Can do. Therefore, it is possible to reduce the heavy floor impact sound by using a vibration damping body that is as light as possible, and a practical vibration damping effect can be achieved without applying an excessive load to the ceiling panel.

  In a preferred embodiment of the ceiling structure, the damping body includes a damping material and a bag body that houses the damping material. In this aspect, not only the vibration damping body can be easily installed, but also the vibration damping body can be easily transported and stored, so that the handling of the vibration damping body becomes convenient and a more practical ceiling structure can be obtained. it can.

  In a preferred embodiment of the ceiling structure, the damping material includes a hybrid obtained by mixing 300 parts by weight of vinyl chloride resin and calcium carbonate with respect to 100 parts by weight. In this aspect, the vibration damping material can be made of a material that can reduce the heavy floor impact sound relatively effectively. In particular, since the hybrid material contains calcium carbonate at a higher ratio than the resin component, it is possible to provide a vibration damping material having a specific gravity capable of reducing heavy floor impact sound.

  In a preferred embodiment of the ceiling structure, the damping material includes a pulverized product of charcoal. In this aspect, the vibration damping material can be made of a material that can reduce the heavy floor impact sound relatively effectively.

  In a preferred embodiment of the ceiling structure, the vibration damping material is a pulverized product of resin waste material. In this aspect, since the pulverized product of the resin waste material can be used as the recycled resin material, for example, the vibration damping material can be easily configured by pulverizing the resin waste material used as the wallpaper of the building. . This contributes to cost reduction and promotes recycling of waste materials.

In the ceiling structure of the preferred embodiment, the damping body has a weight per 1 m ² is arranged to be less than 100% of the weight of the ceiling plate per 1 m ^2. In this aspect, a practical vibration damping effect can be achieved while further reducing the weight.

  As described above, in the present invention, when placing a vibration damping body to absorb solid propagation sound that can propagate from the floor structure to the ceiling plate, using a vibration damping body that is as light as possible, It is possible to reduce heavy floor impact noise, and a practical vibration damping effect can be achieved without applying an excessive load to the ceiling panel.

  Additional features, objects, configurations, and advantages of the present invention can be readily understood from the following detailed description that should be read in conjunction with the accompanying drawings.

1 is a perspective view showing a schematic configuration of a ceiling structure according to an embodiment of the present invention. It is a cross-section part enlarged schematic view of the ceiling structure. It is a plane part expansion schematic of the ceiling structure. It is a perspective view of the damping body employ | adopted as the ceiling structure. It is the principal part expansion schematic of the cross-section part of the same ceiling structure. It is a cross-section part expansion schematic of the ceiling structure which concerns on another embodiment of this invention.

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

  With reference to FIGS. 1 to 3, the ceiling structure of the present embodiment includes a floor structure 1, a grid-like ceiling foundation 2 disposed below the floor structure 1, a ceiling foundation 2, and a floor structure 1. A double ceiling that includes a suspension bolt 3 as a connecting member for connecting the ceiling plate 4 and a ceiling plate 4 fixed to the lower surface of the ceiling base 2, and forms a gap (place) between the floor structure 1 and the ceiling plate 4. (Suspended ceiling). The ceiling structure of the present embodiment includes a vibration damping body 10 that is supported on the ceiling base 2 and placed on the ceiling plate 4.

  The floor structure 1 is a housing part of a building. The floor structure 1 of this embodiment is a reinforced concrete material. But the floor structure 1 is not limited to a reinforced concrete material.

  The ceiling foundation 2 has a plurality of field edges 21 arranged in parallel along the horizontal direction, and a plurality of field edges disposed on the upper surface of the field edge 21 and extending in parallel along the horizontal direction perpendicular to the field edges 21. And a receiver 22. In the following description, the longitudinal direction of the field edge receiver 22 is assumed to be the X direction, and the longitudinal direction of the field edge 21 is assumed to be the Y direction.

  The field edge 21 is a steel material that is arranged in parallel to the Y direction at a constant interval Px (for example, Px = 303 mm) in the X direction. For example, it is defined as a steel base material (wall / ceiling) for JISA6517 building Steel base materials made of steel, and generally used steel base materials such as square studs. Of course, the shape of the material which comprises the field edge 21 is not limited, For example, a lip shape steel, a light groove shape steel, L-shaped steel etc. can be used. As shown in FIG. 5, the field edge 21 in the illustrated example has a pair of side plate portions 21 a, a bottom plate portion 21 b that continues horizontally with the lower ends of both side plate portions, and each side plate portion parallel to the bottom plate portion 21 b. It is a lip groove steel having a pair protruding from the upper end of 21a and having an upper plate portion 21c facing each other with a gap 21d in the horizontal direction. Further, the material of the field edge 21 is not limited, and may be, for example, an aluminum alloy, stainless steel, wood, or the like.

  The field edge receiver 22 is a steel material that is arranged in parallel to the X direction with a constant interval Py (for example, Py = 900 mm to 1200 mm) in the Y direction. For example, a steel foundation material (wall / ceiling) for JISA6517 ) And steel base materials such as commonly used square studs. Of course, the shape of the material which comprises the field edge receiver 22 is not limited, For example, L-shaped steel, the steel material of the shape of a rectangular cross section, or a light groove steel or a lip groove shape steel can be used. Further, the material of the field receiver 22 is not limited, and may be, for example, an aluminum alloy, stainless steel, wood, or the like. By fixing the field edge 21 to the field edge receiver 22, the field edge 21 and the field edge receiver 22 constitute a cross-shaped ceiling foundation 2. The method for fixing the field edge 21 and the field edge receiver 22 is not limited. For example, the field edge 21 and the field edge receiver 22 may be directly fixed by fastening parts such as screws or may be fixed by welding. The ceiling foundation 2 is held horizontally via a suspension bolt 3 connected to the field receiver 22.

  The upper end of the suspension bolt 3 is fixed to the lower portion of the floor structure 1, and the lower end is fixed to the field receiver 22 via the hanger 5, and extends below the floor structure 1 as a whole. The hanger 5 is a sheet metal member arranged long in the vertical direction. The upper end portion of the hanger 5 is bent at a right angle, and the lower end of the suspension bolt 3 is inserted through the flat plate portion. On the other hand, a pair of nuts 6 are screwed into the lower end of the suspension bolt 3. The suspension bolt 3 is connected to the hanger 5 by clamping the flat plate portion with these nuts 6. The lower end of the hanger 5 is bent in a hook shape (U-shape) and receives the lower portion of the field edge receiver 22. Although not specifically shown, the edge receiver 22 and the hanger 5 may be connected by a fixing bracket and fixed by a bolt.

  In addition, the number and arrangement | positioning of the field edge receiver 22, the field edge 21, and the suspension bolt 3 are not limited, It can set suitably according to the weight of the ceiling board 4, etc. FIG.

The ceiling plate 4 is fixed to the lower surface of the field edge 21 and covers the lower surface of the ceiling base 2. The material of the ceiling plate 4 is not limited, but is preferably lightweight and excellent in sound insulation. An example of such a material is a plaster board (PB). The weight per 1 m ² of the ceiling board 4 in this embodiment is 6.5 kg. A damping body 10 attached to the ceiling base 2 is disposed on the top of the ceiling plate 4.

  The damping body 10 includes a damping material 11 and a bag body 12 that houses the damping material 11.

  The vibration damping material 11 of the present embodiment is not particularly limited in its shape, size, volume per piece, specific gravity, weight per piece, number placed on the ceiling plate 4, material, etc. Can be composed of materials. The specific gravity of the damping material 11 is preferably 1.0 to 2.5. The average particle diameter is preferably 0.5 mm to 5 mm. As such a material, resin, wood pieces, pellets, pearlite, natural glass foam, sand, charcoal, or a mixture of at least two of these can be used. As the resin, a solid resin molded product, a hollow resin molded product, a foamed resin molded product, or a pulverized product of these resin molded products is suitable.

  In this embodiment, in particular, recycled resin material waste is employed. The resin material is preferably a mixture of vinyl chloride resin and calcium carbonate in a ratio of 1: 3. Examples of the waste material of the resin material include a crushed material of a cloth material used as a decorative material for a wall.

  In addition to the above pulverized material, the damping material 11 may employ various forms such as a block shape, a spherical shape, a cylindrical shape, a prism shape, a pellet shape, a sheet shape, a flake shape, a granular shape, and a powder shape. The dimensions of the damping material 11 are not particularly limited. However, from the viewpoint of handling and the viewpoint of leakage from the bag body 12, the damping material 11 is prevented from becoming excessively fine. For example, the average diameter is preferably 1 mm or more, and more preferably 2 mm or more. Although an upper limit is not specifically limited, From a handling viewpoint, it is 100 mm or less, for example.

  The bag body 12 is a soft body container such as a film packaging material. Although the material which comprises the bag body 12 is not limited, It is a material which does not inhibit a movement of an internal granule when it vibrates, Comprising: A nonflammable and fireproof material is desirable. Examples of such a material include glass cloth or polyethylene resin. The planar dimensions of the bag body 12 are such that the frontage W × depth D is set to a rectangular planar shape of, for example, 330 mm × 180 mm, and the longitudinal direction is arranged along the X direction.

  Referring to FIGS. 4 and 5, the bag body 12 includes a tray portion 14 that accommodates the damping material 11, a cover portion 15 that closes the upper surface of the tray portion 14, and a locking unit that is fixed to the cover portion 15. It is a film packaging material which has the hook part 16 as.

  The tray unit 14 is a container formed in a deep dish shape having an upper surface 14a (see FIG. 5) that opens in a rectangular shape in plan view. The damping material 11 is filled in the tray portion 14. The volume of the tray unit 14 is appropriately changed depending on the type of the damping material 11 and the number of the damping members 11 arranged on the ceiling plate 4, but the weight of the entire damping body 10 is, for example, about 1 kg or 2 kg. Set to volume.

  The cover portion 15 has a sheet shape, and functions as a member that closes the entire upper surface 14 a of the tray portion 14 filled with the damping material 11 and seals the tray portion 14. Both sides of the cover portion 15 in the longitudinal direction have extended portions 15a (see FIG. 5) extending so as to protrude to both outer sides in the longitudinal direction of the tray portion 14 when viewed in plan. A hook portion 16 to be described next is attached to the cover portion 15 through the extended portion 15a. The extending portion 15a has flexibility and allows the hook portion 16 to rotate around the axis along the Y direction and to move up and down. By these operations, the hook portion 16 can be engaged with and disengaged from the field edge 21 on both sides of the tray portion 14.

  The hook portion 16 is a plate-like member that extends over the entire length in the width direction of the cover portion 15. One end side in the width direction of the hook portion 16 is fixed to the upper surface of the end portion in the longitudinal direction of the cover portion 15. The other end in the width direction of the hook portion 16 has a bowl-shaped portion having a substantially J-shaped cross-sectional shape that curves downward so as to enter the inside of the cover portion 15. The hook portion 16 is brought close to the lower portion of the tray portion 14 by deforming the extending portion 15a when the vibration damping body 10 is installed, and is forcibly fitted between the upper plate portions 21c and 21c of the field edge 21. Thus, as shown in FIG. 5, it has a rigidity that can be detachably locked to the lower surface of the upper plate portion 21 c. An example of such a material is polyethylene terephthalate.

  In addition, the hook part 16 is an example specialized when the field edge 21 uses the lip channel steel, and the locking means of the present invention is not limited to the hook part 16. For example, the locking means may be a string-like or chain-like wound product. Alternatively, the locking means may be a face tape. Alternatively, a metal plate material may be fixed to both ends of the cover portion 15 and the plate material may be fixed with screws or the like.

As shown in FIGS. 1 and 3, when the ceiling foundation 2 is divided into areas of 1 m ^2, for example, six damping bodies 10 are arranged in each area. The damping bodies 10 are arranged in a plurality of rows (two rows in the illustrated example) with the longitudinal direction along the X direction, and each hook portion 16 is locked to a field edge 21 adjacent in the X direction. ing. In the Y direction, the distance Dy between the first row of damping bodies 10 and the second row of damping bodies 10 is, for example, 455 mm. Thereby, the damping body 10 of 6 kg is arranged for every 1 m ² . Weight 1 m ² per ceiling plate 4, in the case of PB, since it is 6.5Kg, the weight of the damping body 10 per 1 m ² is set to about 92% of the weight of the ceiling plate 4 per 1 m ² Will be.

  In the ceiling structure in which the upper floor structure 1 and the lower floor ceiling plate 4 are connected by a plurality of suspension bolts 3 as in this embodiment, the heavy floor impact generated in the upper floor structure 1. Sound (for example, the sound of a child jumping) propagates from the floor structure 1 to the ceiling plate 4 on the lower floor through the suspension bolt 3 and the ceiling base 2 and vibrates the ceiling plate 4. Such heavy floor impact sound is transmitted from the upper floor structure 1 to the ceiling board 4 via the suspension bolts 3 and the ceiling base 2, and the lower floor ceiling board by propagating air. 4 and accompanied by air-borne sound that shakes the ceiling board 4.

  On the other hand, by providing the vibration damping body 10 as in the present embodiment on the ceiling base 2, the vibration energy due to the solid propagation sound and the air propagation sound is generated by the vibration damping material 11 placed on the ceiling base 2. Consumed to vibrate. Therefore, vibration energy from the upper floor is dispersed, vibration energy transmitted to the ceiling plate 4 is reduced, and the degree to which the ceiling plate 4 shakes is reduced. Thereby, the heavy floor impact sound propagating from the upper floor to the lower floor is suppressed.

In particular, in this embodiment, since the weight of the damping body 10 per 1 m ² is set to 80% or more of the weight of the ceiling panel 4, vibration energy transmitted to the ceiling panel 4 is surely reduced, and the upper floor to the lower floor Propagation of heavy floor impact sound is efficiently suppressed. Thereby, the ceiling structure which can suppress a heavy floor impact sound favorably is provided, without using a fine damping material. Further, when placing the damping body to absorb the solid-propagating sound that can propagate from the floor structure to the ceiling panel, the weight of the damping body 10 per 1 m ² should be 80% or more of the weight of the ceiling board 4. By setting, it is possible to reduce the weight floor impact sound with the damping body 10 having the minimum necessary weight. Therefore, it is possible to reduce the heavy floor impact sound using the vibration damping body 10 that is as light as possible, and a practical vibration damping effect can be achieved without applying an excessive load to the ceiling plate 4. .

  When constructing the ceiling structure of the present embodiment, the ceiling foundation 2 is attached by a conventional method after the floor structure 1 is formed. Next, before the ceiling plate 4 is fixed, the damping body 10 is installed. As shown in FIG. 4, before installation, the vibration damping body 10 has a flange-like portion formed at the free ends of the hook portions 16 on both ends in the longitudinal direction with a gap 21 d between the upper plate portions 21 c and 21 c of the field edge 21. By being pushed in, the hook-like portion is locked to the lower surface of the upper plate portion 21c by the elastic restoring force of the hook portion 16, and cannot be easily removed. And the locking force of each hook part 16 becomes high by locking each hook part 16 of the damping body 10 arrange | positioned on the both sides with respect to one field edge 21 as mentioned above. In this way, each damping body 10 is suspended between the field edges 21 by locking the hook parts 16 on both sides of one damping body 10 to the field edge 21 adjacent to the hook part 16. Held in a state.

According to the configuration as described above, the weight of the damping body 10 per 1 m ^{2 is set} to the ceiling board 4 when the damping body is placed in order to absorb the solid propagation sound that can propagate from the floor structure to the ceiling board. By setting the weight to 80% or more of the weight, it is possible to reduce the weight floor impact sound with the damping body 10 having the minimum necessary weight. Therefore, it is possible to reduce the heavy floor impact sound using the vibration damping body 10 that is as light as possible, and a practical vibration damping effect can be achieved without applying an excessive load to the ceiling plate 4. .

  Further, in the vibration damping body 10 of the present embodiment, the vibration damping material 11 is a hybrid or a pulverized charcoal obtained by mixing vinyl chloride resin and calcium carbonate at 300 parts by weight with respect to 100 parts by weight. For this reason, in this embodiment, the damping material 11 can be comprised with the material which can reduce a heavy floor impact sound comparatively effectively. In particular, since the composite contains calcium carbonate at a higher ratio than the resin component, it is possible to provide the vibration damping material 11 having a specific gravity capable of reducing the weight floor impact sound.

  Moreover, in the damping body 10 of the present embodiment, the damping material 11 includes a pulverized product of resin waste material. For this reason, in this embodiment, since the pulverized resin waste material can be recycled as a recycled resin material, for example, the vibration damping material 11 can be easily configured by pulverizing the resin waste material used as the wallpaper of the building. can do. Therefore, the cost of the damping material 11 can be significantly reduced, and the recycling of the waste material is promoted.

(Other embodiments)
As another embodiment of the present invention, a damping body 10 shown in FIG. 6 may be employed.

  With reference to FIG. 6, a damping body 10 shown in FIG. 6 includes a bag body 12 made of a sandbag-like bag. The material of the bag body 12 is preferably a resin such as polyethylene, but is not limited to polyethylene, and may be made of other resins or other materials. Further, the bag body 12 is not limited to a sandbag-like bag, and a bag-like product of another form can also be used.

As the damping material 11 in the embodiment of FIG. 6, the same material as the damping material 11 used in the damping body 10 of FIG. 1 can be employed. In the example of FIG. 6 as well, the weight of the damping body 10 per 1 m ² is set to 80% or more of the weight of the ceiling plate 4. When installing the damping body 10, it is preferable that the bag body 12 is disposed on the center side of the space partitioned by the ceiling base 2.

When the bag body 12 of FIG. 6 is employed, when installing the damping body 10, the ceiling plate 4 is partially fixed to the ceiling base 2, and the damping body 10 is placed on the fixed ceiling plate 4. It is only necessary to repeat the mounting work. Also in the present embodiment, since the weight of the damping body 10 per 1 m ² is set to 80% or more of the weight of the ceiling board 4, an effective damping effect is exerted particularly on heavy floor impact sound. Can do.

In each of the embodiments described above, the lower limit of the weight per 1 m ² of the damping body 10 is preferably less than 100% of the weight of the ceiling plate per 1 m ² . In that case, a practical vibration damping effect can be achieved while further reducing the weight. In addition, there is an advantage that the burden on the ceiling plate 4 and the ceiling base 2 is reduced.

(Floor impact sound measurement test)
In the ceiling structure shown in FIGS. 1 and 2, the following Examples 1 and 2 were prototyped, and a floor impact sound measurement test as described later was performed for each of them. In addition, in order to confirm the effect of Example 1, 2, the floor impact sound measurement test was implemented also about the following comparative examples 1-3. Of the comparative examples, Comparative Example 1 is a state in which vibration suppression is not taken, and the floor impact sound reduction effect of Comparative Examples 2 and 3 and Examples 1 and 2 was verified based on the value of Comparative Example 1. .

[Comparative Example 1]
Ceiling board: One plaster board (6.5 kg / m ² )
Damping material: Not placed [Comparative Example 2]
Ceiling board: 2 pieces of plaster board (13.0kg / m ² )
Damping material: not placed [Comparative Example 3]
Ceiling board: One plaster board (6.5 kg / m ² )
Sound-absorbing material: Glass wool Placement weight on the ceiling board: 1.5kg / m ²
Placement form: Cut and lay [Example 1]
Ceiling board: One plaster board (6.5 kg / m ² )
Damping material: resin granule (a mixture of vinyl chloride resin and calcium carbonate, pulverized product with a specific gravity of 2.1. Average particle diameter of 4 mm, average weight of 2 g per piece)
Placement weight on ceiling plate: 6.0 kg / m ²
Placement: Laying 6 bags filled with damping material in 1kg / piece Bag body: Polyethylene container (330mm x 180mm)
Filling amount: 1.0kg
[Example 2]
Ceiling board: One plaster board (6.5 kg / m ² )
Damping material: resin granule (same as in Example 1)
Placement weight on the ceiling board: 10.0 kg / m ²
Placement form: Laying five bags filled with damping material in 2kg / piece Bag: Polyethylene container (330mm x 180mm)
Filling amount: 2.0kg
(Results of floor impact sound measurement test)
A floor impact sound measurement test was performed in accordance with a test method defined in JIS A 1418. The floor structure 1 is struck using a heavy floor impact sound generator (bang machine), and the floor impact sound generated in response to the impact is received below the ceiling plate 4, and the received floor impact is received. The sound pressure level of the sound was measured for each frequency band. The measurement results are shown in Table 1.

[Verification of effect]
In Comparative Example 1, no measures are taken for the floor impact sound. In this case, the measured value at 63 Hz, which is a general heavy floor impact sound determination frequency, was 89.1 dB. Each aspect was verified about the floor impact sound reduction effect of the damping body with respect to this 89.1 dB. In addition, the floor impact sound reduction effect improves the sound insulation grade every 5 dB of the floor impact sound level. Then, what produces the floor impact sound reduction effect of 5 dB or more at 63 Hz is desired.

  First, Comparative Example 2 is an aspect in which the ceiling board 4 is simply constituted by two plaster boards. In Comparative Example 2, although the weight of the ceiling plate 4 was doubled, the reduction amount of the floor impact sound level was only 1.8 dB.

  Moreover, the comparative example 3 is the aspect which employ | adopted glass wool. When this glass wool was adopted, although the floor impact sound reduction effect was high for the weight, the reduction amount of the floor impact sound level was still only 1.2 dB.

  On the other hand, in Examples 1 and 2, it was possible to obtain a floor impact sound level reduction amount of 7.0 dB or more. Therefore, it was confirmed that by placing the bag-shaped damping body 10 in which the pulverized material is sealed on the ceiling plate 4, a great floor impact noise reduction effect is exhibited.

On the other hand, the weight per 1 m ^2, in the embodiment 1 using the damping body 10 of 6Kg / ^{m 2} (92% by weight of the ceiling plate 4), the effect of reducing 7.0dB is obtained. Further, the weight per 1 m ^2, in Example 2 using the damping body 10 of the 10 Kg / ^{m 2} (weight about 153.8% of the ceiling plate 4), the effect of reducing 9.0dB is obtained . From these results, if the weight of the damping body 10 per 1 m ² is 80% or more of the ceiling plate 4, it is possible to obtain a floor impact sound level reduction amount capable of improving the sound insulation grade by at least one rank. it is conceivable that.

DESCRIPTION OF SYMBOLS 1 Floor structure 4 Ceiling board 10 Damping body 11 Damping material 12 Bag 21 Field edge 22 Field edge receiving

Claims (6)

A floor structure;
A ceiling plate connected to the floor structure;
A damping body placed on the ceiling plate;
With
Ceiling structure the vibration damping body, the weight per at least 1 m ^2, characterized in that are arranged to be more than 80% of the weight of the ceiling plate per 1 m ^2. The ceiling structure according to claim 1,
The said damping body is provided with the damping material and the bag body which accommodates the said damping material. The ceiling structure characterized by the above-mentioned. The ceiling structure according to claim 2,
The vibration damping material includes a hybrid obtained by mixing 300 parts by weight of vinyl chloride resin and calcium carbonate with respect to 100 parts by weight. The ceiling structure according to claim 2,
The vibration damping material includes a pulverized product of charcoal. In the ceiling structure according to claim 2 or 3,
The ceiling structure is characterized in that the damping material is a pulverized product of resin waste material. In the ceiling structure according to any one of claims 1 to 5,
The damping body, ceiling structure weight per 1 m ² is characterized in that it is arranged to be less than 100% of the weight of the ceiling plate per 1 m ^2.

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