JP2021121705A - Sound insulation structure in building - Google Patents

Abstract

To provide a sound insulation structure in a building capable of further surely suppressing transmission of floor impact sound generated in an upper floor part to a lower floor part.SOLUTION: A building 10 is a two-storied building having a first floor part 14 and a second floor part 15. An inter-floor space 33 is formed between a ceiling surface material 27 of the first floor part 14 and a floor surface material 28 of the second floor part 15. The inter-floor space 33 is provided with a damping material 53 and a sound absorption material 54. The damping material 53 is provided to cover ceiling small beams 25 supporting the ceiling surface material 27 from an upper side thereof, and is placed above the ceiling surface material 27 on both sides across the ceiling small beams 25. The sound absorption material 54 is provided to cover the damping material 53 from the upper side.SELECTED DRAWING: Figure 1

Description

The present invention relates to a sound insulation structure in a building.

In a multi-storey unit-type building having a lower floor and an upper floor, an inter-floor space is formed between the ceiling surface material of the lower floor and the floor material of the upper floor. In such a building, when an impact sound (floor impact sound) is generated due to an object falling on the floor of the upper floor, it is assumed that the floor impact sound is transmitted to the lower floor through the inter-floor space. Will be done. For this reason, in such a building, measures may be taken to reduce the impact noise generated on the floor of the upper floor by providing a vibration damping damper or the like on the floor of the upper floor. According to such measures, it is possible to suppress the transmission of the floor impact sound to the lower floor by reducing the floor impact sound on the floor of the upper floor.

By the way, in the above configuration, when the floor impact sound generated on the floor of the upper floor cannot be sufficiently reduced by the vibration damping damper or the like, the sound that cannot be completely reduced is transmitted to the lower floor through the inter-floor space. It may be transmitted. Therefore, in view of these points, Patent Document 1 discloses a configuration in which a sound absorbing sheet is attached to the upper surface of the ceiling surface material of the lower floor. In the configuration of Patent Document 1, a sound absorbing sheet is arranged on the upper surface of the ceiling surface material between each ceiling beam that supports the ceiling surface material from above. According to such a configuration, even when the sound that cannot be completely reduced on the floor of the upper floor propagates to the side of the lower floor, the sound can be absorbed by the sound absorbing sheet. Therefore, it is possible to suppress the transmission of sound from the upper floors to the lower floors.

JP-A-2019-123988

Here, in the configuration of Patent Document 1, since the sound absorbing sheet is arranged between the ceiling beams on the upper surface of the ceiling surface material, the sound that could not be completely reduced on the floor of the upper floor is the ceiling beams. There is a risk that it will be transmitted as solid-borne sound to the ceiling surface material via the above. Therefore, the configuration of Patent Document 1 still has room for improvement in suppressing the transmission of sound to the lower floors.

The present invention has been made in view of the above circumstances, and mainly provides a sound insulation structure in a building capable of more reliably suppressing the floor impact sound generated in the upper floor from being transmitted to the lower floor. It is the purpose.

In order to solve the above problems, the sound insulation structure in the building of the first invention is applied to a building having a lower floor portion and an upper floor portion adjacent to the upper and lower floors, and the ceiling surface material of the lower floor portion and the upper floor portion. An inter-floor space is formed between the floor material and the floor material, and a vibration damping material is provided in the inter-floor space so as to cover the ceiling support beam that supports the ceiling surface material from above. It is characterized in that a sound absorbing material is provided so as to cover the vibration damping material from above.

According to the first invention, in the inter-floor space between the ceiling surface material of the lower floor and the floor material of the upper floor, a ceiling support beam for supporting the ceiling surface material of the lower floor from above is provided above the floor. A vibration damping material is provided so as to cover the ceiling. In this case, even if the impact sound (floor impact sound) generated on the floor of the upper floor is transmitted to the ceiling support beam on the lower floor, the sound (especially the heavy floor impact sound) should be reduced by the damping material. Can be done. Therefore, it is possible to suppress the sound from being transmitted from the ceiling support beam to the ceiling surface material.

Further, in the inter-floor space, a sound absorbing material is further provided so as to cover the damping material from above. In this case, even if the floor impact sound generated on the upper floor is transmitted to the lower floor side through the inter-floor space, the sound (especially the lightweight floor impact sound) can be absorbed by the sound absorbing material. can. Therefore, it is possible to suppress the sound from being transmitted to the ceiling surface material on the lower floor. As a result, by combining the damping material and the sound absorbing material, it is possible to suppress the transmission of both the heavy floor impact sound and the lightweight floor impact sound generated on the floor of the upper floor to the lower floor. Therefore, it is possible to more reliably suppress the floor impact sound generated in the upper floor from being transmitted to the lower floor.

The sound insulation structure in the building of the second invention is the same as that in the first invention, the vibration damping material is provided on the beam mounting portion mounted on the upper surface of the ceiling support beam and on both sides of the ceiling support beam. It is characterized by having a pair of ceiling mounting portions mounted on the upper surface of the ceiling surface material.

According to the second invention, the damping material is placed on the ceiling support beam and is placed on the upper surface of the ceiling surface material on both sides of the ceiling support beam. In this case, the vibration damping material can reduce the sound (sound vibration) transmitted to the ceiling support beam and can also reduce the sound transmitted to the ceiling surface material. As a result, it is possible to further suppress the floor impact sound generated in the upper floor from being transmitted to the lower floor.

In the first or second invention, the sound insulation structure in the building of the third invention is applied to the unit type building in which the lower floor portion and the upper floor portion are each composed of a building unit, and the lower floor portion is applied. The building unit has a plurality of ceiling beams provided side by side as the ceiling support beams, and also has the ceiling surface material supported by each of the ceiling beams, and the vibration damping. The material is provided so as to cover the ceiling beam from above, and the sound absorbing material is provided so as to cover the vibration damping material from above.

In the third invention, the first invention is applied to a unit type building. In a unit-type building, a building is constructed by manufacturing a building unit in advance at a manufacturing factory and transporting the manufactured building unit to a construction site for installation. In this case, when the damping material and the sound absorbing material are installed on the ceiling of the building unit on the lower floor, the installation work can be performed from above the ceiling surface material previously assembled to the building unit. This makes it possible to easily perform the work of installing the damping material and the sound absorbing material.

As for the sound insulation structure in the building of the fourth invention, in any one of the first to third inventions, a plurality of the vibration damping materials are provided for each of the ceiling support beams, and the sound absorbing material is the plurality of the vibration damping materials. It is characterized in that it is provided in a state where the materials are collectively covered from above.

According to the fourth invention, a plurality of damping materials are provided for each ceiling support beam. In this case, the size of the damping material can be suppressed as compared with the case where the damping material is provided straddling a plurality of ceiling support beams. Therefore, it is possible to easily handle the damping material having a relatively large weight, and it is possible to preferably perform the installation work thereof. On the other hand, the sound absorbing material is provided in a state where a plurality of damping materials are collectively covered from above. In this case, since the sound absorbing material has a relatively small weight, it can be easily handled even if the size is large. Therefore, the combination of the vibration damping material and the sound absorbing material can provide a suitable configuration for suppressing the transmission of sound to the lower floors.

A vertical cross-sectional view showing the structure of the inter-floor portion. A plan view showing a state in which a damping material and a sound absorbing material are provided on the ceiling of the first floor. A perspective view showing an outline of a unit type building. The perspective view which shows the structure of a building unit.

Hereinafter, an embodiment embodying the present invention will be described with reference to the drawings. In the present embodiment, the present invention is embodied in a two-story unit type building having a steel frame rigid frame structure. A unit-type building is a building constructed by combining a plurality of building units with each other. FIG. 3 is a perspective view showing an outline of a unit-type building, and FIG. 4 is a perspective view showing a configuration of a building unit.

As shown in FIG. 3, a building 10 such as a house includes a building main body 12 provided on a foundation 11 and a roof portion 13 provided above the building main body 12. The building body 12 is a two-story building having a first floor portion 14 as a lower floor portion and a second floor portion 15 as an upper floor portion. The first floor portion 14 and the second floor portion 15 are each composed of a plurality of building units 20. These building units 20 are manufactured in advance at a manufacturing factory and then transported to a construction site by a truck or the like. The building unit 20 constituting the first floor portion 14 can be referred to as a lower floor unit, and the building unit 20 constituting the second floor portion 15 can be referred to as an upper floor unit.

As shown in FIG. 4, the building unit 20 has four pillars 21 arranged at its four corners, and four ceiling girders 22 and floor girders 23 connecting the upper ends and lower ends of the pillars 21, respectively. And. A rectangular parallelepiped skeleton (frame) is formed by the pillars 21, the ceiling girder 22, and the floor girder 23. The pillar 21 is made of square tubular steel. The ceiling girder 22 and the floor girder 23 are made of channel steel having a U-shaped cross section, and are installed so that their openings face each other.

A plurality of ceiling beams 25 are bridged between the ceiling beams 22 facing each other on the long sides of the building unit 20 at predetermined intervals (specifically, at equal intervals). Similarly, a plurality of floor beams 26 are bridged between the floor beams 23 facing each other on the long sides of the building unit 20 at predetermined intervals (specifically, at equal intervals). The ceiling beam 25 and the floor beam 26 are provided at the same interval and at positions corresponding to the upper and lower sides. The ceiling beam 25 is made of lip channel steel, and the floor beam 26 is made of square steel. Further, the ceiling surface material 27 is supported from above by the ceiling beam 25, and the floor surface material 28 is supported from below by the floor beam 26.

Next, the configuration of the inter-floor portion, which is the boundary portion between the first floor portion 14 and the second floor portion 15, will be described. FIG. 1 is a vertical cross-sectional view showing the structure of the inter-floor portion.

As shown in FIG. 1, in the first floor portion 14, a first floor space 31 is formed below the ceiling surface material 27. In the second floor portion 15, a second floor space 32 is formed above the floor surface material 28. The first floor space 31 and the second floor space 32 are all living spaces such as a living room, a dining room, and a bedroom.

An interfloor space 33 is formed between the ceiling surface material 27 of the first floor portion 14 and the floor surface material 28 of the second floor portion 15. The inter-floor space 33 is vertically partitioned from the first floor space 31 by the ceiling surface material 27 of the first floor portion 14, and is vertically partitioned from the second floor space 32 by the floor surface material 28 of the second floor portion 15.

A plurality of floor beams 26 are provided side by side on the floor of the second floor portion 15. A floor surface material 28 is provided on these floor beams 26. The floor surface material 28 is composed of a plurality of surface materials 34 to 38 laminated on the upper and lower sides. The floor surface material 28 includes a floor base surface material 34 provided so as to straddle the upper surface of each floor beam 26, another floor base surface material 35 superposed on the floor base surface material 34, and a floor base surface material 35. It has a vibration damping sheet 36 stacked on top of the vibration damping sheet 36, a floor base surface material 37 stacked on the vibration damping sheet 36, and a floor finishing surface material 38 stacked on the floor base surface material 37.

The floor base surface material 34 is made of a hard wood piece cement board, and the floor base face material 35 is made of a particle board. The vibration damping sheet 36 is made of an asphalt-based vibration damping sheet, and is formed in a sheet shape, for example, by impregnating asphalt with iron oxide powder. The vibration damping sheet 36 has sound insulation performance, and blocks the floor impact sound applied on the floor surface material 28 from being transmitted to the first floor portion 14. Therefore, the vibration damping sheet 36 can also be referred to as a sound insulating sheet (sound insulating mat). Further, the floor base surface material 37 is made of plywood, and the floor finish surface material 38 is made of flooring.

By the way, the heavy floor impact sound is a relatively low sound generated when a child jumps or runs around on the floor material 28 of the second floor portion 15, and the lightweight floor impact sound is an article such as a spoon as a floor material. 28 It is a relatively high sound that occurs when dropped on the floor.

The floor portion of the second floor portion 15 is provided with a plurality of damping dampers 41 and 46 for reducing the floor impact noise generated by the floor surface material 28 of the second floor portion 15. These vibration damping dampers 41 and 46 are particularly effective in reducing the heavy floor impact sound among the lightweight floor impact sound and the heavy floor impact sound. The vibration damping dampers 41 and 46 include a beam damper 41 attached to the floor beam 26 and a floor damper 46 attached to the floor member 28.

The beam damper 41 absorbs the vibration energy applied to the floor beam 26. The beam damper 41 is attached to each floor beam 26, for example, at a central position in the longitudinal direction of each floor beam 26.

The beam damper 41 has a bracket 42 fixed to the floor beam 26, an elastic member 43 fixed to the bracket 42, and a weight member 44 attached to the bracket 42 via the elastic member 43. There is. The bracket 42 is a metal plate material fixed to the lower surface of the floor beam 26 by welding or the like, and projects laterally from the floor beam 26 in the width direction (short direction) of the floor beam 26. .. The elastic member 43 is made of an elastically deformable rubber material, and the weight member 44 is made of a metal material. The weight members 44 are arranged on both sides of the floor beam 26, and each of the weight members 44 is placed on the bracket 42 via the elastic member 43.

In the beam damper 41, the elastic member 43 enables the relative movement of the weight member 44 with respect to the floor beam 26. Therefore, when the floor beam 26 sways due to the sound generated on the floor material 28 of the second floor portion 15, the elastic member 43 elastically deforms, so that the weight member 44 becomes the floor beam 26. Move in the opposite direction. In this case, the vibration energy applied to the floor beam 26 is absorbed by the beam damper 41, whereby the floor impact sound (particularly the heavy floor impact sound) generated by the floor surface material 28 is reduced by the beam damper 41. It has become so.

The floor damper 46 absorbs the vibration energy applied to the floor material 28 of the second floor portion 15. The floor damper 46 is attached to the lower surface of the floor member 28 and is arranged between the adjacent floor beams 26. The floor damper 46 is arranged at the center position of each adjacent floor beam 26 in the floor material 28, for example.

The floor damper 46 includes a bracket 47 fixed to the lower surface of the floor material 28 (specifically, the lower surface of the floor base surface material 34), an elastic member 48 fixed to the bracket 47, and a bracket 47 via the elastic member 48. It has a weight member 49 attached to the floor. The bracket 47 is formed including a leaf spring, and is fixed to the lower surface of the floor surface material 28 with screws or the like. The elastic member 48 is made of an elastically deformable rubber material, and the weight member 49 is made of a metal material.

In the floor damper 46, the elastic member 48 enables the relative movement of the weight member 49 with respect to the floor material 28. Therefore, when the floor material 28 of the second floor portion 15 shakes, the elastic member 48 is elastically deformed and the weight member 49 moves in the opposite direction to the floor material 28. In this case, the vibration energy applied to the floor surface material 28 is absorbed by the floor surface damper 46, whereby the floor impact sound (particularly the heavy floor impact sound) generated by the floor surface material 28 is reduced by the floor surface damper 46. It has become so.

Subsequently, the configuration of the ceiling portion of the first floor portion 14 will be described. A plurality of ceiling beams 25 are provided side by side on the ceiling portion of the first floor portion 14. A field edge 51 is attached to the lower surface of each ceiling beam 25. These field edges 51 are made of long wooden timber and extend along the longitudinal direction of the ceiling beam 25. Further, a ceiling surface material 27 is attached to the lower surface of each field edge 51 with screws or the like. The ceiling surface material 27 is made of two layers of gypsum board.

The floor space 33 is provided with a vibration damping material 53 and a sound absorbing material 54. In the present embodiment, the vibration damping material 53 and the sound absorbing material 54 suppress the floor impact sound generated on the floor of the second floor portion 15 from being transmitted to the first floor portion 14 via the interfloor space 33. .. This embodiment is characterized by such a point, and in the following, the characteristic configuration will be described with reference to FIG. 2 in addition to FIG. FIG. 2 is a plan view showing a state in which the vibration damping material 53 and the sound absorbing material 54 are provided on the ceiling portion of the first floor portion 14.

As shown in FIGS. 1 and 2, the damping material 53 is provided for each ceiling beam 25 in the inter-floor space 33. The damping material 53 is made of a granular damping material, and is formed by packing a large number of chips (for example, rubber chips) made of a resin material into a bag. Since the damping material 53 is a granular damping material, its shape can be changed to some extent.

A plurality of damping materials 53 are provided on each ceiling beam 25, and in the present embodiment, two damping materials 53 are provided on each ceiling beam 25. In this case, the damping members 53 provided on the ceiling beams 25 are arranged apart from each other in the longitudinal direction of the ceiling beams 25. Further, the damping members 53 provided on the adjacent ceiling beams 25 are arranged apart from each other in the arrangement direction in which the ceiling beams 25 are lined up.

Each damping material 53 is provided so as to cover the ceiling beam 25 from above, and is placed on the upper surface of the ceiling surface material 27 on both sides of the ceiling beam 25. Each vibration damping material 53 includes a beam mounting portion 53a mounted on the upper surface of the ceiling beam 25 and a pair of hanging portions 53b extending downward from both ends of the beam mounting portion 53a in the width direction of the ceiling beam 25. And the ceiling mounting portion 53c which extends from the lower end portion of each of the hanging portions 53b to the side (specifically, the side separated from the ceiling beam 25) and is mounted on the upper surface of the ceiling surface material 27. The ceiling beam 25 is covered from above by the beam mounting portion 53a, and the ceiling beam 25 is covered from the side by each hanging portion 53b. When the floor impact sound generated on the floor of the second floor portion 15 is transmitted to the ceiling beam 25, the sound is reduced by the damping material 53. Further, the vibration damping material 53 is particularly effective in reducing heavy floor impact noise.

The sound absorbing material 54 is provided in the inter-floor space 33 so as to straddle the vibration damping material 53 above each. The sound absorbing material 54 is a fiber-based sound absorbing material formed of a fiber-based material, and is made of, for example, glass wool. Further, the sound absorbing material 54 is formed in a plate shape having a predetermined thickness, and is spread over the entire area of the inter-floor space 33 in a plan view. The sound absorbing material 54 is arranged in a state where the vibration damping materials 53 are collectively covered from above. The sound absorbing material 54 has a sound absorbing performance, and absorbs the floor impact sound generated in the floor portion of the second floor portion 15 in the interfloor space 33. Further, the sound absorbing material 54 has a particularly high sound absorbing effect on lightweight floor impact sound.

Next, the work flow when constructing the above-mentioned building 10 will be described.

First, in the manufacturing factory, each building unit 20 constituting the building 10 is manufactured. When manufacturing the building unit 20, the ceiling surface material 27 is attached to the ceiling portion of the building unit 20, and the floor surface material 28 is attached to the floor portion.

After that, for the building unit 20 of the first floor portion 14, each damping material 53 is arranged on the ceiling surface material 27. In this case, each damping material 53 is arranged so as to cover the ceiling beam 25 from above (see FIG. 2). Further, after the damping material 53 is arranged, the sound absorbing material 54 is spread on the ceiling surface material 27 so as to cover each of the damping materials 53 from above. Further, for the building unit 20 of the second floor portion 15, a beam damper 41 is attached to each floor beam 26, and a floor damper 46 is attached to the floor material 28.

After manufacturing each building unit 20, the building unit 20 is transported to the construction site by a truck. At the construction site, each building unit 20 is installed at a predetermined position and connected to each other. As a result, the building 10 is constructed, and the damping material 53 and the sound absorbing material 54 are respectively arranged in the inter-floor space 33 between the first floor portion 14 and the second floor portion 15.

As described above, in the unit type building 10, all of the sound insulation structures (vibration damping dampers 41 and 46, vibration damping material 53 and sound absorbing material 54) in the inter-floor portion between the first floor portion 14 and the second floor portion 15 are provided. It is constructed in the building unit 20 in the manufacturing factory. Therefore, it is possible to construct a sound insulation structure in the inter-floor portion while suppressing an increase in the workload at the construction site.

According to the configuration of the present embodiment described in detail above, the following excellent effects can be obtained.

In the interfloor space 33 between the ceiling surface material 27 of the first floor portion 14 and the floor surface material 28 of the second floor portion 15, a ceiling beam 25 that supports the ceiling surface material 27 of the first floor portion 14 from above is provided from above. A vibration damping material 53 was provided so as to cover it. In this case, even if the impact sound (floor impact sound) generated on the floor of the second floor portion 15 is transmitted to the ceiling beam 25 of the first floor portion 14, the sound (particularly the heavy floor impact sound) is transmitted by the vibration damping material 53. Can be reduced. Therefore, it is possible to suppress the sound from being transmitted from the ceiling beam 25 to the ceiling surface material 27.

Further, in the inter-floor space 33, a sound absorbing material 54 is further provided so as to cover the vibration damping material 53 from above. In this case, even if the floor impact sound generated on the floor of the second floor portion 15 is transmitted to the side of the first floor portion 14 via the interfloor space 33, the sound (particularly the lightweight floor impact sound) is absorbed by the sound absorbing material 54. can do. Therefore, it is possible to suppress the sound from being transmitted to the ceiling surface material 27 of the first floor portion 14. As a result, by combining the damping material 53 and the sound absorbing material 54, it is possible to suppress the transmission of both the heavy floor impact sound and the lightweight floor impact sound generated on the floor portion of the second floor portion 15 to the first floor portion 14. .. Therefore, it is possible to more reliably suppress the floor impact sound generated in the second floor portion 15 from being transmitted to the first floor portion 14.

The damping material 53 was placed on the upper surface of the ceiling beam 25, and was placed on the upper surface of the ceiling surface material 27 on both sides of the ceiling beam 25. In this case, the vibration damping material 53 can reduce the sound (sound vibration) transmitted to the ceiling beam 25 and the sound transmitted to the ceiling surface material 27. As a result, it is possible to further suppress the floor impact sound generated in the second floor portion 15 from being transmitted to the first floor portion 14.

Further, since the granular damping material is used as the damping material 53, its shape can be easily changed. Therefore, the damping material 53 is suitably placed on the ceiling beam 25 and the ceiling surface material 27 having different height positions. It becomes possible.

A sound insulation structure having a vibration damping material 53 and a sound absorbing material 54 was applied to a unit type building. In this case, when installing the damping material 53 and the sound absorbing material 54 on the ceiling of the building unit 20 on the first floor portion 14, the installation work is performed from above the ceiling surface material 27 previously assembled to the building unit 20. It can be carried out. This makes it possible to easily perform the work of installing the vibration damping material 53 and the sound absorbing material 54.

A plurality of damping materials 53 are provided for each ceiling beam 25. In this case, the size of the damping material 53 can be suppressed as compared with the case where the damping material 53 is provided over the plurality of ceiling beams 25. Therefore, it is possible to easily handle the damping material 53 having a relatively large weight, and it is possible to preferably perform the installation work thereof. On the other hand, the sound absorbing material 54 is provided so as to cover a plurality of damping materials 53 together from above. In this case, since the sound absorbing material 54 has a relatively small weight, it can be easily handled even if the size is large. Therefore, the combination of the vibration damping material 53 and the sound absorbing material 54 can be configured to be suitable for suppressing the transmission of sound to the first floor portion 14.

The present invention is not limited to the above embodiment, and may be implemented as follows, for example.

(1) In the above embodiment, two damping members 53 are provided on each ceiling beam 25, but three or more damping members 53 may be provided on each ceiling beam 25. Further, one vibration damping material 53 may be provided on each ceiling beam 25.

Further, in the above embodiment, the damping material 53 is provided for each ceiling beam 25, but for example, the damping material 53 may be provided so as to straddle the two adjacent ceiling beams 25.

If the desired sound insulation performance can be obtained, it is not necessary to provide the damping material 53 on each ceiling beam 25 (in other words, on all of the ceiling beams 25), and the vibration damping material 53 does not need to be provided on each ceiling beam 25. It may be provided only in a part of them.

(2) In the above embodiment, the granular vibration damping material is used as the vibration damping material 53, but a sheet-shaped vibration damping sheet may be used as the vibration damping material 53. Also in this case, by providing the damping material 53 so as to cover the ceiling beam 25 from above, the same effect as that of the above embodiment can be obtained.

Further, in the above embodiment, glass wool is used as the sound absorbing material 54, but a fiber-based sound absorbing material other than glass wool such as rock wool may be used as the sound absorbing material 54. Further, as the sound absorbing material 54, a material other than the fiber-based sound absorbing material may be used.

(3) In the above embodiment, a part of the damping material 53 is placed on the upper surface of the ceiling surface material 27 to form the ceiling mounting portion 53c, but the damping material 53 is placed on the upper surface of the ceiling surface material 27. It may be arranged in a state where it is not. For example, it is conceivable that the damping material 53 is formed with a width as small as the width of the ceiling beam 25 and is placed only on the upper surface of the ceiling beam 25.

(4) In the above embodiment, the vibration damping material 53 and the sound absorbing material 54 are arranged on the ceiling surface material 27 of the building unit 20 at the manufacturing plant, but the sound absorbing material 53 and the sound absorbing material 54 are sound absorbing. The material 54 may be arranged on the ceiling surface material 27 of the building unit 20 at the construction site. In this case, after installing the building unit 20 on the first floor portion 14 at the construction site, the sound absorbing material 54 is arranged on the ceiling surface material 27 of the building unit 20. In this case, after the sound absorbing material 54 is arranged, the building unit 20 on the second floor portion 15 is installed.

Further, both the damping material 53 and the sound absorbing material 54 may be arranged on the ceiling surface material 27 of the building unit 20 at the construction site.

(5) In the above embodiment, the present invention is applied to a unit type building, but the present invention can also be applied to a building having another structure such as a building constructed by a steel frame construction method. Further, in the above embodiment, the present invention is applied to a two-story building, but the present invention may be applied to, for example, a three-story or more building. For example, in a three-story building, the present invention may be applied to the inter-floor portion between the second-floor portion and the third-floor portion.

10 ... Building, 14 ... First floor as lower floor, 15 ... Second floor as upper floor, 20 ... Building unit, 25 ... Ceiling beam as ceiling support beam, 27 ... Ceiling surface material, 28 ... Floor Face material, 33 ... Inter-floor space, 53 ... Vibration damping material, 53a ... Beam mounting part, 53c ... Ceiling mounting part, 54 ... Sound absorbing material.

Claims (4)

Applies to buildings with lower and upper floors adjacent to each other
An interfloor space is formed between the ceiling surface material of the lower floor and the floor material of the upper floor.
In the inter-floor space, a vibration damping material is provided so as to cover the ceiling support beam that supports the ceiling surface material from above from above, and a sound absorbing material is provided so as to cover the vibration damping material from above. Sound insulation structure in a building characterized by being. The damping material includes a beam mounting portion mounted on the upper surface of the ceiling support beam and a pair of ceiling mounting portions mounted on the upper surface of the ceiling surface material on both sides of the ceiling support beam. The sound insulation structure in the building according to claim 1, wherein the building has. It is applied to a unit-type building in which the lower floor and the upper floor are each composed of building units.
The building unit on the lower floor has a plurality of ceiling beams provided side by side as the ceiling support beams, and also has the ceiling surface material supported by each of the ceiling beams. ,
The damping material is provided so as to cover the ceiling beam from above.
The sound insulation structure in a building according to claim 1 or 2, wherein the sound absorbing material is provided so as to cover the vibration damping material from above. A plurality of the damping materials are provided for each of the ceiling support beams.
The sound insulation structure in a building according to any one of claims 1 to 3, wherein the sound absorbing material is provided in a state where the plurality of the vibration damping materials are collectively covered from above.

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