JP6504965B2 - Damping body - Google Patents

Description

The present invention relates to a damping body and a ceiling structure using the same, and more particularly, to a damping body that reduces floor impact noise propagating from the floor to the lower floor of a building and a ceiling structure using the same.

  In a multi-story building such as an apartment complex, a floor structure on an upper floor and a ceiling plate on a lower floor are connected by a plurality of connecting members. The upper end portion of the connecting member is connected to a slab or a beam which supports the floor structure from below. On the other hand, the lower end portion of the connecting member is connected to the ceiling plate via the ceiling base. The ceiling base has a plurality of field edges. This field edge is generally a long steel plate fixed to the upper surface of the ceiling plate at a predetermined distance. After the ceiling base including the edge of the field is constructed, the ceiling plate is fixed to the lower surface thereof.

  In such a ceiling structure, floor impact noise is easily transmitted from the floor structure to the ceiling plate. The floor impact sound is a sound that is generated by a wide frequency component depending on the weight and softness of the impact vibration, and is propagated and observed in the lower floor room.

  Among them, the impact of heavy and soft objects such as jumping, running around and walking is referred to as heavy floor impact sound, and the impact of light and hard things such as chair drag and spoon falling is referred to as lightweight floor impact sound.

  In many cases, the weight floor impact sound is the performance determination frequency for the 63 Hz band and the light floor impact sound for the 125 Hz or 250 Hz band.

  Since such floor impact noises, especially heavy floor impact noises, are unpleasant noises for the lower floor occupants, a number of measures have been proposed to reduce floor impact noises.

  For example, Patent Document 1 discloses a ceiling structure having a damping body disposed across a field edge. The damping body has a bag and a granular body housed in the bag. As the granular material, perlite, sand, or a natural glass foam or a mixture of at least two of these is used.

JP 2014-37678 A

  Conventionally, in order to construct a damping body, a part of the ceiling plate is affixed in advance to the edge, and then the damping body is mounted on the upper surface of the ceiling plate, and then another ceiling plate is affixed, It was necessary to repeat the work of mounting the damping body on top and to construct.

  On the other hand, the damping body is a soft body in which the bag is filled with the granular body. Therefore, it is necessary to install a soft body in a narrow ceiling space, and the workability is poor, and in addition to the complexity of attaching and detaching the ceiling plate, the construction is extremely difficult. Therefore, it has been difficult to put it into practice in terms of cost.

  The present invention has been made in view of the above-described problems, and has a vibration damping effect that is relatively practical and that can be applied easily at an inexpensive cost, and uses the vibration damping body. It is an issue to provide a ceiling structure.

In order to solve the above problems, the present invention provides a floor structure, a plurality of field edges disposed in parallel along the horizontal direction below the floor structure, and a ceiling fixed to the lower surface of the field edge. The damping body installed in the ceiling structure provided with the board WHEREIN: The bag body arrange | positioned between the said adjacent field edges, The damping material filled with the inside of the said bag body, The both ends of the said bag body A locking means provided on the part , the locking means being engageable with the field edge so as to hold the bag between the adjacent field edges, at positions corresponding to both ends of the bag A flexible extending portion is provided, and the locking means is a damping body characterized in that it is a hook portion joined to the extending portion and capable of engaging and disengaging with the field edge . In this aspect, floor impact noise can be reduced by providing a damping body including a bag body filled with a damping material. In addition, the damping body is disposed between adjacent field edges, and the locking means (hook portions) provided at both ends of the bag body are locked to the field edges adjacent to the locking means. The body can be suspended between adjacent field edges. Therefore, when installing the damping body, it becomes possible to perform the installation work of the damping body even before the ceiling plate is installed. Therefore, the workability is improved and the construction is extremely easy, so that the construction cost can be significantly reduced. Furthermore, since the locking means is the hook portion and the hook portion can be disengaged from the edge by mechanical operation, the construction work of the bag body is further facilitated. Further, since the hook portion is joined to the flexible extension portion, the attaching / detaching operation of the hook portion can be easily realized regardless of the capacity of the bag.

  In the damping body according to a preferred embodiment, the bag body is a film packaging material including a deep-dish tray portion having an upper surface, and a sheet-like cover portion sealing the upper surface of the tray portion. In this aspect, since the bag body is formed of the film packaging material, mass production can be easily performed, and as a product, it is lightweight and easy to handle.

  In the damper of a preferred embodiment, the damping material is a hybrid of a polyvinyl chloride resin and calcium carbonate mixed at 300 parts by weight with respect to 100 parts by weight. Moreover, the said damping material may contain the pulverized material of charcoal. In these aspects, the damping material can be made of a material that can relatively effectively reduce the weight floor impact noise. In particular, since the composite contains calcium carbonate at a higher ratio than the resin component, it is possible to provide a specific gravity damping material capable of reducing heavy floor impact noise.

  In the damping body according to a preferred aspect, the damping material includes a pulverized product of resin waste material. In this aspect, since the crushed resin waste material can be recycled as a recycled resin material, for example, the damping material can be easily configured by crushing the resin waste material used as a wallpaper of a building. . Therefore, it contributes to cost reduction and promotes recycling of waste materials.

  As described above, according to the present invention, it is possible to achieve a remarkable effect that it has a relatively practical floor impact sound reduction effect and can be easily installed at a low cost.

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

It is a perspective view which shows schematic structure of the ceiling structure which concerns on one Embodiment of this invention. It is the cross-sectional partial enlargement schematic of the ceiling structure. It is the 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-sectional part of the same ceiling structure.

  Hereinafter, an embodiment of the present invention will be described based on the drawings.

  Referring to FIGS. 1 to 3, the ceiling structure according to the present embodiment includes a floor structure 1, a lattice-like ceiling base 2 disposed below the floor structure 1, a ceiling base 2, and a floor structure 1. And a ceiling plate 4 fixed to the lower surface of the ceiling base 2, and a double ceiling forming a gap between the floor structure 1 and the ceiling plate 4 (Suspended ceiling) is configured. And the ceiling structure of this embodiment is provided with the damping body 10 supported by the ceiling base 2 and mounted on the ceiling board 4.

  The floor structure 1 is a frame portion of a building. The floor structure 1 of the present embodiment is a reinforced concrete construction material. However, the floor structure 1 is not limited to reinforced concrete.

  The ceiling base 2 is provided on a plurality of field edges 21 arranged in parallel along the horizontal direction and on the upper surface of the field edge 21, and a plurality of field edges extending in parallel along the horizontal direction orthogonal to the field edge 21. And a receiver 22. In the following description, it is assumed that the longitudinal direction of the edge support 22 is the X direction, and the longitudinal direction of the edge 21 is the Y direction.

  The field edge 21 is a steel material disposed in parallel in the Y direction at a predetermined interval Px (for example, Px = 303 mm) in the X direction, for example, specified in JISA 6517 steel base material for construction (walls and ceilings) Steel base materials such as square studs and the like generally used. Of course, the shape of the material which comprises the edge 21 is not limited, For example, a lip steel, a light channel steel, an L-shaped steel etc. can be used. The cross section 21 in the illustrated example has a pair of side plate portions 21a as shown in FIG. 5, a bottom plate portion 21b horizontally connected to the lower ends of both side plate portions, and each side plate portion parallel to the bottom plate portion 21b. It is a lip grooved steel having a pair projecting from the upper end of 21a and having an upper plate portion 21c facing each other with a gap 21d in the horizontal direction. Moreover, the material of the edge 21 is not limited, either, For example, aluminum alloy, stainless steel, a wood etc. may be sufficient.

  The edge support 22 is a steel material arranged in parallel in the X direction at a constant interval Py (for example, Py = 900 mm to 1200 mm) in the Y direction. For example, JISA 6517 steel base material for construction (walls and ceilings) The steel base material specified in the above, or a generally used steel base material such as a square stud. Of course, the shape of the material forming the edge receptacle 22 is not limited, and for example, L-shaped steel, steel of a rectangular cross-section, or light groove steel or lip groove steel can be used. Further, the material of the edge receiver 22 is not limited either, and may be, for example, aluminum alloy, stainless steel, wood or the like. By fixing the field edge 21 to the field edge receptacle 22, the field edge 21 and the field edge receptacle 22 constitute a cross-shaped ceiling base 2. The fixing method of the field edge 21 and the field edge holder 22 is not limited, and for example, it may be directly fixed by a fastening part such as a screw or may be fixed by welding. The ceiling base 2 is horizontally held via a suspension bolt 3 connected to the edge support 22.

  The upper end of the suspension bolt 3 is fixed to the lower part of the floor structure 1 and the lower end is fixed to the rim support 22 via the hanger 5 and extends vertically below the floor structure 1 as a whole. The hanger 5 is a sheet metal member disposed 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 pressing the flat plate portion with these nuts 6. Further, the lower end of the hanger 5 is bent in a hook shape (U-shape) to receive the lower portion of the rim 22. Specifically, although not shown, the edge support 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 receptacle 22, the field edge 21, and the suspension bolt 3 are not limited, According to the weight etc. of the ceiling board 4, it can set suitably.

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. Although the material of the ceiling plate 4 is not limited, it is desirable that the material be lightweight and have excellent sound insulation. As such a material, a plaster board (PB) is illustrated. Weight 1 m ² per ceiling plate 4 in this embodiment is 6.5 kg. A damping body 10 attached to the ceiling base 2 is disposed above the ceiling plate 4.

  The damping body 10 has a damping material 11 and a bag body 12 that accommodates the damping material 11.

  The damping material 11 of the present embodiment is not particularly limited in its shape, size, volume per piece, specific gravity, weight per piece, number of pieces mounted on the ceiling plate 4, material, etc. It can be composed of materials. Moreover, as for specific gravity of the damping material 11, 1.0-2.5 are preferable. Moreover, as for an average particle diameter, 0.5 mm-5 mm are preferable. As such a material, resin, wood chips, pellets, perlite, natural glass foam, sand, charcoal, or a mixture of at least two of these, or the like can be employed. 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 preferable.

  In the present embodiment, in particular, one obtained by recycling waste resin material is employed. As a resin material, what mixed vinyl chloride resin and calcium carbonate in the ratio of 1: 3 is preferable. Moreover, as a waste material of such a resin material, the ground material of the cloth | cross material utilized as a decorative material of a wall is illustrated.

  The shape of the vibration damping material 11 can adopt various aspects such as block shape, spherical shape, cylindrical shape, prismatic shape, pellet shape, sheet shape, flake shape, granular shape, and powder shape other than the above-mentioned crushed material. The dimensions of the damping material 11 are also 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. The upper limit is also not particularly limited, but is, for example, 100 mm or less from the viewpoint of handling.

  The bag body 12 is a container of a soft body 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 movement of the granule inside when vibrating, and a nonflammable and fireproof material is desirable. As such a material, a glass cloth or a polyethylene resin is illustrated, for example. The planar dimensions of the bag body 12 are such that a front opening W × depth D is, for example, a rectangular planar shape of 330 mm × 180 mm, and the longitudinal direction thereof is disposed along the X direction.

  With reference to FIGS. 4 and 5, the bag body 12 is fixed to the tray portion 14 for accommodating the damping material 11, the cover portion 15 for closing the upper surface of the tray portion 14, and the cover portion 15. And a hook portion 16 as a film packaging material.

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

  The cover portion 15 is in the form of a sheet, and functions as a member for closing the entire upper surface 14 a of the tray portion 14 filled with the damping material 11 and sealing the tray portion 14. Both sides in the longitudinal direction of the cover portion 15 have extending portions 15a (see FIG. 5) extended so as to project to the longitudinal outer sides of the tray portion 14 in plan view. The hook portion 16 described next is attached to the cover portion 15 via the extension portion 15a. The extending portion 15a has flexibility, and allows the hook portion 16 to rotate around an axis along the Y direction and to move up and down. By these operations, the hook portion 16 can be engaged with and released from the side edge 21 at both sides of the tray portion 14.

  The hook portion 16 is a plate-like member extending over the entire length in the width direction of the cover portion 15. The widthwise one end side of the hook portion 16 is fixed to the upper surface of the end portion of the cover portion 15 in the longitudinal direction. The other end side in the width direction of the hook portion 16 has a hook-shaped portion having a substantially J-shaped cross-sectional shape which is curved downward so as to go into the inside of the cover portion 15. The hook portion 16 approaches the lower side of the tray portion 14 by deforming the extending portion 15a when the damping body 10 is installed, and is forcibly fitted between the upper plate portions 21c and 21c of the edge 21. Thus, as shown in FIG. 5, the upper plate portion 21c has a rigidity that can be detachably engaged with the lower surface of the upper plate portion 21c. As such a material, for example, polyethylene terephthalate is exemplified.

  In addition, the hook part 16 is an example specialized in the case where the field edge 21 uses lip grooved steel, and the locking means of this invention is not limited to the hook part 16. FIG. For example, the locking means may be a string-like or chain-like roll. Alternatively, the hook means may be a face tape. Alternatively, a metal plate may be fixed to both ends of the cover portion 15, and the plate may be fixed by screws or the like.

As shown in FIGS. 1 and 3, the damping member 10, when dividing the ceiling base 2 in the region of each 1 m ^2, for example, in each area, it is arranged six. The vibration damping body 10 is disposed in a plurality of rows (two rows in the illustrated example) along the longitudinal direction in the X direction, and the respective hook portions 16 are locked to the field edges 21 adjacent in the X direction. ing. In the Y direction, an interval Dy between the damping body 10 in the first row and the damping body 10 in the second row is, for example, 455 mm. As a result, 6 kg of damping body 10 is disposed 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 It will be

  In the ceiling structure in which the floor structure 1 on the upper floor and the ceiling plate 4 on the lower floor are connected by a plurality of suspension bolts 3 as in the present embodiment, the weight floor impact generated in the floor structure 1 on the upper floor A sound (for example, a sound of a child jumping) is transmitted from the floor structure 1 to the ceiling plate 4 of the lower floor through the suspension bolt 3 and the ceiling base 2 to vibrate the ceiling plate 4. Such a heavy floor impact sound is a solid propagation sound that propagates from the floor structure 1 on the upper floor to the ceiling board 4 via the suspension bolt 3 and the ceiling base 2 and an air on the floor board on the lower floor 4 and with the airborne sound that shakes the ceiling plate 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-borne sound and the air-borne sound is the vibration damping material 11 placed on the ceiling base 2. Consumed to vibrate. Therefore, the vibration energy from the upper floor is dispersed, the vibration energy transmitted to the ceiling plate 4 is reduced, and the degree to which the ceiling plate 4 shakes is reduced. This suppresses heavy floor impact noise propagating from the upper floor to the lower floor.

In particular, in this embodiment, since the weight of the damping body 10 per 1 m ² is set to more than 80% of the weight of the ceiling plate 4, vibration energy is reduced reliably transmitted to the top plate 4, from top to bottom floor floor Propagation of heavy floor impact noise to the vehicle is efficiently suppressed. This provides a ceiling structure capable of well suppressing heavy floor impact noise without using a fine damping material.

  When constructing the ceiling structure of the present embodiment, the ceiling base 2 is attached by a conventional method after the floor structure 1 is created. Next, before the ceiling plate 4 is fixed, the damping body 10 is installed. Before installation, as shown in FIG. 4, the damping body 10 has a hook-like portion formed at the free end of the hook portion 16 on both longitudinal side sides and a gap 21 d between the upper plate portions 21 c and 21 c of the field edge 21. By pushing it inward, the hooked portion is locked to the lower surface of the upper plate portion 21c by the elastic restoring force of the hook portion 16, and it is not easily removed. And the locking force of each hook part 16 becomes high by making 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 manner, each damping body 10 is suspended between the field edges 21 by locking the hook portions 16 on both sides of one damping body 10 to the field edges 21 adjacent to the hook portions 16. It is held in the state.

  According to the configuration as described above, the damping body 10 is disposed between adjacent field edges 21, and the hook portions 16 provided at both ends of the bag 12 are connected to the field edge 21 where the hook portions 16 are adjacent. By locking, the bag body 12 can be held suspended between adjacent field edges 21.

  Thus, in the present embodiment, when installing the damping body 10, it becomes possible to perform the installation work of the damping body 10 before the ceiling plate 4 is installed. Therefore, the workability is improved and the construction is extremely easy, so that the construction cost can be significantly reduced. Moreover, the damping body 10 is a soft body in which the granular damping material 11 is packed in the bag body 12. Therefore, after the ceiling plate 4 is fixed to the lower surface of the field edge 21, the damping body 10 stretched between the field edges 21 is in close contact with the upper surface of the ceiling plate 4. Therefore, it becomes easy to suppress the vibration of the ceiling board 4, and it can contribute to buffer of a floor impact noise. Moreover, since the bag body 12 can be disposed on the center side of the space divided by the ceiling base 2, the vibration energy transmitted to the ceiling plate 4 can be effectively absorbed, and the damping function can be exhibited.

  Moreover, in the damping body 10 of the present embodiment, the bag body 12 is a film packaging material including the deep-dish tray portion 14 having the upper surface, and the sheet-like cover portion 15 sealing the upper surface of the tray portion 14. . As described above, in the present embodiment, since the bag body 12 is made of the film packaging material, mass production can be easily performed, and as a product, it is lightweight and easy to handle.

  Further, in the vibration damping body 10 of the present embodiment, the flexible extending portions 15a are provided at positions corresponding to both end portions of the bag 12, and the locking means is joined to the extending portions 15a and It is the hook part 16 which can be disengaged. For this reason, in the present embodiment, since the hook portion 16 as the locking means can be engaged with and disengaged from the edge 21 by mechanical operation, the construction work of the bag body 12 is further facilitated. Further, since the extending portion 15a is a flexible portion extended to the sheet-like cover portion 15, the attaching and detaching operation of the hook portion 16 can be easily realized regardless of the capacity of the bag body 12. it can.

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

  Moreover, in the damping body 10 of this embodiment, the damping material 11 contains the crushed material of resin waste material. For this reason, in the present embodiment, since the crushed resin waste can be recycled as a recycled resin material, the damping material 11 can be easily configured, for example, by crushing resin waste used as wallpaper for buildings. can do. Therefore, the cost of the damping material 11 can be significantly reduced, and the recycling of waste material is also promoted.

Further, in the present embodiment, the floor structure 1 comprises a ceiling plate 4 which is fixed at intervals in the lower floor structure 1, and the damping body 10, the at least 1 m ² per damping body 10 weight is arranged to be more than 80% of the weight of the ceiling plate per 1 m ^2. For this reason, in the present embodiment, it is possible to obtain a ceiling structure using the damping body 10 having a weight that exhibits a relatively suitable reduction effect against heavy floor impact noise.

(Floor impact sound measurement test)
In the ceiling structure shown in FIG. 1 and FIG. 2, the following Examples 1 and 2 were made as prototypes, and floor impact sound measurement tests as described later were conducted on each of them. In addition, in order to confirm the effect of Example 1, 2, the floor impact sound measurement test was implemented collectively also about the following Comparative Examples 1-3. Among the comparative examples, the comparative example 1 is in a state where no vibration suppression is taken, and the floor impact noise reduction effect of the comparative examples 2 and 3 and the examples 1 and 2 was verified based on the value of the comparative example 1 .

Comparative Example 1
Ceiling plate: 1 plasterboard (6.5 kg / m ² )
Damping material: not mounted [Comparative example 2]
Ceiling plate: Two plaster boards (13.0 kg / m ² )
Damping material: not mounted [Comparative example 3]
Ceiling plate: 1 plasterboard (6.5 kg / m ² )
Sound absorbing material: Glass wool Mounting weight on the ceiling plate: 1.5 kg / m ² (Since the specific gravity is small, it can not be mounted anywhere)
Mounting form: cutting and laying [Example 1]
Ceiling plate: 1 plasterboard (6.5 kg / m ² )
Damping material: Resin granules (composite of vinyl chloride resin and calcium carbonate, pulverized material with specific gravity 2.1. Average particle diameter 4 mm, average weight 2 g per piece)
Mounting weight on the ceiling plate: 6.0 kg / m ²
Mounting form: 6 bags of damping material filled with 1 kg / piece are placed. Bag: Polyethylene container (330 mm × 180 mm)
Filling amount: 1.0 kg
Example 2
Ceiling plate: 1 plasterboard (6.5 kg / m ² )
Damping material: Resin-made granule (same as Example 1)
Mounting weight on the ceiling plate: 10.0 kg / m ²
Mounting form: 5 bags of damping material filled with 2 kg / piece are laid. Bag: Polyethylene container (330 mm × 180 mm)
Filling amount: 2.0 kg
(Result of floor impact sound measurement test)
The floor impact sound measurement test was conducted in accordance with the test method defined in JIS A 1418. Impact is performed using a floor impact sound generator (bang machine) from above the floor structure 1, and the floor impact sound generated as a result of this impact is received below the ceiling plate 4, and the floor impact 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 have been taken for floor impact noise. The measured value at 63 Hz, which is a general weight floor impact sound determination frequency in that case, was 89.1 dB. Each aspect was verified about the floor impact noise reduction effect of the damping body to this 89.1 dB. The floor impact noise reduction effect improves the noise insulation class every 5 dB of floor impact noise level. Then, what has a floor impact noise reduction effect of 5 dB or more at 63 Hz is desired.

  First, Comparative Example 2 is an aspect in which the ceiling plate 4 is simply configured 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 an aspect which employ | adopted glass wool. When this glass wool is adopted, although the floor impact sound reduction effect is high for weight, the reduction amount of the floor impact sound level is still only 1.2 dB.

  On the other hand, in Examples 1 and 2, the floor impact sound level reduction amount of 7.0 dB or more could be obtained. Therefore, it was confirmed that a large floor impact noise reduction effect can be achieved by placing the bag-like damping body 10 in which the crushed material is sealed on the ceiling plate 4.

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. In addition, as to the weight per 1 m ² , in the example 2 using the damping body 10 of 10 kg / m ² (weight of about 153.8% of the ceiling plate 4), the reduction effect of 9.0 dB was obtained . From these results, if the weight of the damping body 10 per 1 m ² is 80% or more by weight of the ceiling plate 4, it is possible to obtain a reduction of at least 1 rank upgradeable floor impact sound level sound insulation grade it is conceivable that.

Reference Signs List 1 floor structure 2 ceiling base 3 suspension bolt 4 ceiling plate 10 damping body 11 damping material 12 bag body 16 hook portion (an example of locking means)
21 field border

Claims (5)

A control installed on a ceiling structure comprising a floor structure, a plurality of field edges disposed in parallel along the horizontal direction below the floor structure, and a ceiling plate fixed to the lower surface of the field edge In the vibration body,
A bag disposed between the adjacent field edges;
A damping material filled inside the bag body;
And locking means provided at both ends of the bag so as to be able to lock the bag so that the bag is held between the adjacent edges .
A flexible extension is provided at a position corresponding to both ends of the bag body,
The damping body is characterized in that the locking means is a hook portion joined to the extending portion and capable of engaging and disengaging with the outer edge . In the damping body according to claim 1,
The said bag body is a film packaging material containing the deep-dish-shaped tray part which has an upper surface, and the sheet-like cover part which seals the upper surface of the said tray part. In the damping body according to claim 1 or 2 ,
The vibration damping material is characterized in that the vibration damping material includes a hybrid of 300 parts by weight of polyvinyl chloride resin and calcium carbonate with respect to 100 parts by weight. In the damping body according to claim 1 or 2 ,
The damping material is characterized in that it includes a pulverized material of charcoal. In the damping body according to any one of claims 1 to 3 ,
The damping member is a pulverized product of resin waste material.

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