JP2019039229A - Double wall - Google Patents

Abstract

To provide a double wall which can widen a room and can suppress the decrease in sound insulation performance due to the influence of the resonance frequency by the air spring of the air layer.SOLUTION: The double wall 3 according to the present invention has a double wall structure having a wall 5 and an additional wall 75 formed by providing a wall plate 7 in front of the wall 5 with an air layer 6 interposed therebetween, in which the air layer 6 is provided with a porous fiber absorbing material (non-woven fabric 60) having a density of 8-16 kg/m.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a double wall that is a wall structure including a boundary wall and an additional wall formed by providing a wall plate in front of the boundary wall via an air layer.

  A so-called double wall comprising a boundary wall such as a border wall and a partition wall and an additional wall formed by providing a wall plate such as a gypsum board through an air layer in front of the boundary wall is known. (Refer to patent document 1 etc.).

JP 2009-203639 A

  In the conventional double wall, when the space between the air layers formed between the field wall and the wall plate is reduced in order to widen the room, the resonance frequency of the air springs of the air layer is lowered. For example, when the space between the air layers is set to about 50 mm, the resonance frequency of the air springs in the air layer is in the 100 Hz band, resulting in a decrease in sound insulation performance in the 100 Hz band.

  The present invention provides a double wall capable of widening a room and suppressing a decrease in sound insulation performance based on the influence of a resonance frequency by an air spring of an air layer.

The double wall according to the present invention is a double wall which is a wall structure including a boundary wall and an additional wall formed by providing a wall plate in front of the boundary wall via an air layer. Since the porous fiber sound absorbing material having a density of 8 kg / m ³ to a density of 16 kg / m ³ is provided, the room can be widened and the sound insulation performance can be reduced based on the influence of the resonance frequency by the air spring of the air layer. Can provide a double wall that can be suppressed.
In addition, the upper end surface of the wall plate constituting the additional wall is separated from the ceiling slab surface, and the lower end surface of the wall plate constituting the additional wall is separated from the floor surface, or the additional wall is configured. The upper end surface of the wall plate and the ceiling slab surface are brought into contact with each other, and the lower end surface of the wall plate constituting the additional wall and the floor surface are brought into contact with each other. And the ceiling slab surface, between the lower end surface of the wall plate constituting the additional wall and the floor surface, one of them is separated and the other is contacted, so that the room can be widened, It is possible to provide a double wall that can suppress a decrease in sound insulation performance based on the influence of the resonance frequency by the air spring of the air layer.
Moreover, since the resonance frequency by the air spring of an air layer is a 100 Hz band, while being able to enlarge a room, the double wall which can suppress the fall of the sound insulation performance in a 100 Hz band can be provided.
Moreover, since the porous fiber sound-absorbing material is a non-woven fabric, glass wool, or rock wool, the room can be widened and the sound insulation performance is lowered due to the influence of the resonance frequency by the air spring of the air layer. Can provide a double wall.

The longitudinal cross-sectional view which shows the building provided with the double wall. The longitudinal cross-sectional view which shows the building provided with the double wall. The longitudinal cross-sectional view which shows the building provided with the double wall. The front view for demonstrating the double wall used for the measurement experiment of sound transmission loss. The side view for demonstrating the double wall used for the measurement experiment of sound transmission loss. The numerical data table which shows the measurement experiment result of sound transmission loss. The graph which shows the measurement experiment result of sound transmission loss. The graph which shows the measurement experiment result of sound transmission loss.

Embodiment 1
As illustrated in FIGS. 1 to 3, the building 1 including the double wall 3 according to the first embodiment includes a floor structure 2, a double wall 3, a ceiling structure 4, and a room 10.

  As shown in FIGS. 1 and 2, the double floor as the floor structure 2 includes a floor slab 12, a plurality of support legs 13 with anti-vibration rubber disposed on the floor slab 12 at predetermined intervals, The floor space 9 is a space between the floor slab 12 and the floor plate component 14. The floor space 9 has a floor plate component 14 formed on the plurality of support legs 13.

The support legs 13 are provided on the anti-vibration rubber 15 installed on the floor slab 12, the support 16 attached to the anti-vibration rubber 15 at the lower part and supported by the anti-vibration rubber 15, and the upper end of the support 16. A pedestal 17 is provided. The outer peripheral surface of the upper part of the support column 16 is formed in a male screw portion (not shown). The pedestal 17 is formed of, for example, a particle board or a structural plywood. The pedestal 17 includes an unillustrated through-hole penetrating the upper and lower surfaces of the pedestal 17, and a cylindrical body 18g passing through the through-hole is fixed in the through-hole, and an inner peripheral surface of the cylindrical body 18g is It is formed in a female thread portion outside the figure.
That is, the support leg 13 is configured so that the pedestal 17 is attached to the support column 16 by screw fitting between the external thread of the external thread portion formed on the outer peripheral surface of the upper portion of the support column 16 and the internal thread portion of the internal thread portion formed on the inner peripheral surface of the cylindrical body 18g. The level (height) of the base plate 14 can be adjusted by adjusting the level (height) of the pedestal 17.

The floor board component 14 includes a base material 18 formed on the support legs 13, a base material 19 formed on the base material 18, and a floor finishing material 20 formed on the base material 19. .
The base material 18 and the pedestal 17 are fixed by fixing means not shown, and the base material 18 and the base material 19 are fixed by fixing means not shown. For example, a nail, a screw nail, a tucker needle, or a screw is used as the fixing means and the fixing means described later.
The base material 18 is composed of a plurality of plate members that are placed on the pedestals 17 of the plurality of support legs 13 and arranged in a horizontal plane and fixed to the pedestal 17 by fixing means. As a board | plate material which comprises the base material 18, a particle board, a structural plywood, etc. are used, for example.
The base material 19 is composed of a plurality of plate members that are placed on the base material 18 so as to form a horizontal plane and are fixed to the base material 18 by fixing means. Examples of the plate material constituting the base material 19 include a particle board, a reinforced particle board (a particle board formed harder than a normal particle board), a structural plywood, a gypsum board, and a calcium silicate board. Gypsum board with glass fiber nonwoven fabric is used.
A floor finish 20 is attached to the upper surface of the base material 19. The floor finishing material 20 is composed of a flooring floor material, a carpet, a tile, a carpet, a stone plate, a tatami mat, and the like.

  As shown in FIG. 3, the directly pasted floor as the floor structure 2 has a floor finishing material 20 such as a flooring floor material, a carpet, a tile, a carpet, a stone plate, and a tatami mat directly on the floor surface of the floor slab 12 as a frame floor. It is a floor structure formed by the pasted direct pasting method, and has no floor space. In the case of the directly pasted floor, the floor finishing material 20 constitutes the floor board component 14.

The double wall 3 is, for example, a door wall 50 as a boundary wall 5 formed by RC (steel reinforced concrete) walls, and an air layer 6 in front of the door wall 50 so as to face the door wall 50. And an additional wall 75 formed by providing a gypsum board 70 as the wall plate 7, and a resonance frequency by an air spring of the air layer 6 formed between the door wall 50 and the gypsum board 70. Is a wall structure in which the nonwoven fabric 60 as a porous fiber sound-absorbing material having a density of 8 kg / m ³ to a density of 16 kg / m ³ is provided in the air layer 6.
For example, the distance between the air layers 6 is 50.5 mm, the board thickness of the gypsum board 70 is 9.5 mm, and the distance from the surface of the doorway wall 50 to the indoor side surface of the gypsum board 70 (= finishing thickness) is 60 mm. , and the entire surface of Sakaikabe side surface of the gypsum board 70 (the back surface), by which is formed to a thickness of 50mm of the plate-like density 8 kg / ^{m 3} or nonwoven 60 of density 16 kg / ^{m 3} is attached The double wall 3 is configured such that the air layer 6 is provided with a nonwoven fabric 60 having a density of 8 kg / m ³ or a density of 16 kg / m ³ .

  The additional wall 75 includes a floor-side runner 31 attached to the floorboard component 14 or the floor slab 12, a ceiling-side runner 32 attached to the ceiling slab 41, a plurality of bases attached to the floor-side runner 31 and the ceiling-side runner 32. It is a wall constituted by a column (stud) 33, a gypsum board 70 as a wall plate 7 attached to the base column 33, and a wall finishing material 71 such as a cloth or a coating provided on the surface of the gypsum board 70.

  The gypsum board 70 is attached to a base surface 34 formed by a plurality of base pillars 33 built in the recesses of the floor-side runner 31 and the recesses of the ceiling-side runner 32 with screws or the like not shown. Then, a wall finishing material 71 is provided on the surface of the gypsum board 70 attached to the base surface 34 to construct the additional wall 75. That is, the wall base material provided in front of the boundary wall 5 includes a floor side runner 31, a ceiling side runner 32, and a plurality of base pillars 33, 33... Attached to the floor side runner 31 and the ceiling side runner 32. Composed.

A baseboard 76 is attached to the lower end surface of the gypsum board 70 attached to the base surface 34. The lower end surface of the baseboard 76 and the lower end surface of the gypsum board 70 are located on substantially the same plane.
In addition, the lower end surface of the baseboard 76 and the lower end surface of the gypsum board 70 and the upper surface of the floor board constituting portion 14 are configured to be spaced apart from each other by an interval S1 (see FIGS. 1 to 3).

For example, the floor-side runner 31 and the ceiling-side runner 32 that constitute a part of the wall base material provided in front of the boundary wall 5 have a concave cross section cut in a direction orthogonal to the long direction. It is formed of a long material. That is, the floor-side runner 31 and the ceiling-side runner 32 extend in the same direction from the long side edges of both the long strip-like substrate (bottom plate) 35 and the substrate 35 and are perpendicular to the substrates. Or it has the side plate 36,37 provided substantially perpendicularly, and is the structure provided with the recessed part enclosed by the said board | substrate 35 and both the side plates 36,37.
The ceiling-side runner 32 is disposed at the planned installation position of the upper ends of the plurality of base pillars 33 on the slab surface of the ceiling slab 41 with the opening of the recess facing downward, and the substrate 35 is fixed to the ceiling slab 41 by fixing means 39 such as anchor bolts. Fixed to.

In addition, FIG. 1 shows the building 1 constructed | assembled by the floor advance construction method which precedes floor construction, and FIG. 2 has shown the building 1 constructed | assembled by the wall advance construction method which precedes wall construction.
In the case of the building 1 constructed by the floor advance construction method, the floor-side runner 31 has a plurality of base pillars 33 on the base material 19 on the end surface side near the door wall 50 in the base material 19 with the opening of the recess facing upward. The board 35 is fixed to the base material 19 by a fixing means 38 such as a screw nail (not shown) which is arranged at the planned installation position at the lower end. And it is comprised so that the end surface near the doorway wall 50 in the floor finishing material 20 and the side board 36 at the side of the room 10 of the floor side runner 31 may be spaced apart by an interval S2. Moreover, it is comprised so that the end surface close | similar to the door wall 50 in the base material 18 and the base material 19 and the door wall 50 may space apart by space | interval S3.
Further, in the case of the building 1 constructed by the preceding wall construction, the floor-side runner 31 is disposed at the planned installation position of the lower ends of the plurality of base pillars 33 on the floor slab 12 with the opening of the recess facing upward. Is fixed to the floor slab 12 by fixing means 39 such as anchor bolts. And it is comprised so that the end surface close | similar to the door boundary wall 50 in the floor board structure part 14 and the front surface (surface by the side of the room 10) of the foundation | substrate pillar 33 may space apart.
Further, in the case of the building 1 in which the floor structure 2 is configured by a directly attached floor as shown in FIG. 3, the floor-side runner 31 has a plurality of base pillars 33 on the floor slab 12 with the opening of the recess facing upward. The substrate 35 is fixed to the floor slab 12 by a fixing means 39 such as an anchor bolt. And it is comprised so that the end surface near the door-boundary wall 50 in the floor finishing material 20 (floor board structure part 14) and the side board 36 by the side of the room 10 of the floor side runner 31 may be spaced apart by the space | interval S5.

  The ceiling structure 4 includes a suspension bolt 42 provided on the ceiling slab 41, a hanger 43 as a field edge holder attached to the suspension bolt 42, a field edge receiver 44, a field edge attachment 45, a field edge 46, a field edge A ceiling board 47 such as a ceiling board and a decorative board attached to the edge 46 is provided, and the ceiling back space 8 is a space between the ceiling slab 41 and the ceiling board 47. That is, the ceiling structure 4 is provided such that the suspension bolt 42 is fastened to the insert nut 48 embedded in the ceiling slab 41 so that the suspension bolt 42 protrudes downward from the ceiling slab 41, and the hanger 43 is attached to the suspension bolt 42. A field receiver 44 is attached to the hanger 43, a field edge 46 is attached to the field edge receiver 44 by a field edge attachment 45, and a ceiling plate 47 is attached below the field edge 46 with screws or the like.

In the building 1 constructed by the floor prior construction method shown in FIG. 1, the air layer 6 and the ceiling space 8 and the air layer 6 and the underfloor space 9 are communicated so that air can flow, The air layer 6 of the wall 3 was provided with a nonwoven fabric 60 as a porous fiber sound absorbing material having a density of 8 kg / m ³ or a density of 16 kg / m ³ . In this case, the communication means for communicating the air layer 6 and the ceiling back space 8 is an opening between the upper end 70 t of the gypsum board 70, the lower end of the side plate 36 on the room 10 side of the ceiling runner 32, and the base pillar 33. The communication means that is formed and communicates between the air layer 6 and the underfloor space 9 is formed by the openings formed at the interval S3 described above. In addition, in the building 1 constructed | assembled by the said floor preceding construction method, the through-hole outside a figure is formed in the side plate 36 by the side of the room 10 of the floor-side runner 31 of FIG. 1, and the said through-hole and the space | interval S2 mentioned above. The air layer 6 and the indoor space 10X may be configured to communicate with each other through S1 so that air can flow.

In the building 1 constructed by the wall advance construction method shown in FIG. 2, air can flow through the air layer 6 and the ceiling back space 8, the air layer 6 and the underfloor space 9, and the air layer 6 and the indoor space 10X. Thus, the air layer 6 of the double wall 3 was provided with a nonwoven fabric 60 as a porous fiber sound-absorbing material having a density of 8 kg / m ³ to a density of 16 kg / m ³ . In this case, the communication means for communicating the air layer 6 and the ceiling back space 8 is an opening between the upper end 70 t of the gypsum board 70, the lower end of the side plate 36 on the room 10 side of the ceiling runner 32, and the base pillar 33. The communication means that is formed and communicates the air layer 6 and the underfloor space 9 is the opening between the lower end of the gypsum board 70, the upper end of the side plate 36 on the room 10 side of the floor side runner 31, and the base pillar 33. The communication means that is formed and further communicates the air layer 6 and the indoor space 10X is formed by the openings formed at the above-described intervals S4 and S1.

Moreover, in the building 1 in which the floor structure 2 is configured by a directly attached floor as shown in FIG. 3, air can flow through the air layer 6 and the ceiling space 8 and the air layer 6 and the indoor space 10X. The nonwoven fabric 60 as a porous fiber sound-absorbing material having a density of 8 kg / m ³ to a density of 16 kg / m ³ was provided in the air layer 6 of the double wall 3. In this case, the communication means for communicating the air layer 6 and the ceiling back space 8 is an opening between the upper end 70 t of the gypsum board 70, the lower end of the side plate 36 on the room 10 side of the ceiling runner 32, and the base pillar 33. The communication means that is formed and communicates the air layer 6 and the indoor space 10X includes the above-described through-hole formed in the side plate 36 on the room 10 side of the floor-side runner 31 described above and the spacing S5 described above. It is formed by the opening formed in S1. In this case, the through hole outside the figure of the floor side runner 31 is formed, for example, at a position facing the end surface of the end portion of the floor finish 20 in the side plate 36 on the room 10 side of the floor side runner 31.

Further, the gypsum board 70 may be extended to the position of the ceiling-side runner 32 so that the back surface on the upper end side of the gypsum board 70 contacts the outer surface of the side plate 36 on the room 10 side of the ceiling-side runner 32. is there. In this case, the side plate 36 on the room 10 side of the ceiling side runner 32 is provided with a through hole (not shown), and the air layer 6 and the ceiling space 8 are communicated with each other through the through hole so that air can flow. It is good.
Further, in the case of the building 1 constructed by the wall advance construction method shown in FIG. 2, the gypsum board 70 is extended to the position of the floor side runner 31, and the back surface on the lower end side of the gypsum board 70 and the floor side runner 31. In some cases, the outer surface of the side plate 36 on the room 10 side is in contact with the outer surface. In this case, the side plate 36 on the room 10 side of the floor side runner 31 is provided with a through hole (not shown), and the air layer 6 and the underfloor space 9 are communicated through the through hole so that air can flow. Also good.

Embodiment 2
In the first embodiment, the double wall 3, that is, the additional wall 75, is configured such that the air layer 6 and the ceiling space 8 and the air layer 6 and the indoor space 10 </ b> X communicate with each other so that air can flow. A configuration in which the upper end surface of the gypsum board 70 (wall plate 7) is separated from the ceiling slab surface (a configuration in which a gap (gap = opening) is provided between the upper end surface of the gypsum board 70 and the ceiling slab surface); In addition, a configuration in which the lower end surface of the gypsum board 70 constituting the additional wall 75 is separated from the floor surface (a configuration in which a gap (gap = opening) is provided between the lower end surface of the gypsum board 70 and the floor surface. The double wall 3) is described, but the bottom surface of the gypsum board 70 constituting the additional wall 75 and the floor surface are in contact with each other, or the top surface of the gypsum board 70 constituting the additional wall 75. A structure in contact with the ceiling slab surface or an additional wall 75 It may be a lower end surface and the double wall 3 structure in contact with the upper surface and the ceiling slab surface of the gypsum board 70 constituting an additional wall 75 with contacting with the floor surface of the gypsum board 70.
That is, between the upper end surface of the gypsum board 70 (wall plate 7) constituting the additional wall 75 and the ceiling slab surface, and between the lower end surface of the gypsum board 70 constituting the additional wall 75 and the floor surface, The double wall 3 is configured such that one side is separated and the other is in contact with each other, or the upper end surface of the gypsum board 70 constituting the additional wall 75 is brought into contact with the ceiling slab surface (on top of the gypsum board 70). The gap between the end surface and the ceiling slab surface is not provided (gap = opening), and the bottom surface of the gypsum board 70 constituting the additional wall 75 is in contact with the floor surface. It is good also as the double wall 3 (it was set as the structure which does not provide a space | interval (gap = opening) between the lower end surface of the gypsum board 70, and a floor surface).
For example, the double wall 3 configured to prevent air from flowing between the air layer 6 and the ceiling space 8, or the double wall 3 configured to prevent air from flowing between the air layer 6 and the indoor space 10X, or The double wall 3 may be configured such that the air layer 6 and the ceiling space 8 have a configuration in which air hardly flows, and the air layer 6 and the indoor space 10X have a configuration in which air does not easily flow.

An experiment for demonstrating the sound insulation performance of the double wall 3 in each of the first and second embodiments was performed.
That is, as shown in FIG. 5, the board thickness of the gypsum board 70 of the additional wall 75 of the double wall 3 is 9.5 mm, and the interval W between the air layers 6 of the double wall 3 is 50.5 mm (finish thickness) 60 mm-gypsum board 9.5 mm), and a double wall in which the resonant frequency f of the air layer 6 is 96 Hz, and the air layer 6 is provided with a plurality of double-layered porous fiber sound-absorbing materials. An experiment was conducted in which a wall was produced and the sound transmission loss of each double wall (the larger the value, the better the sound insulation performance) was measured. That is, the double wall used in the experiment is a wall structure in which the resonance frequency of the air spring of the air layer 6 is in the 100 Hz band.

  The sound transmission loss was measured according to JIS A 1416: 2000 “Measurement method of air sound blocking performance of building members in the laboratory”. The measurement was performed using the fixed microphone method, and the measurement target frequency range was set to a 1/3 octave band center frequency of 63 Hz to 4000 Hz.

Specifically, a through-hole having a square opening of 10 m ² is formed in each of the wall of the sound source chamber M and the sound receiving chamber L, and the center of the through hole of the sound source chamber M and the sound receiving chamber L The through-holes face each other so as to coincide with the center of the through-hole, and an RC wall X (field wall 5) having a thickness of 100 mm is formed between the through-holes so as to close the through-holes. A plurality of gypsum boards 70, 70... Are attached to the sound chamber L side so as to have a finished thickness of 60 mm to form an additional wall 75 (see FIG. 5), and a double wall A group satisfying the following conditions: (Double walls A, A1, A2, A3, A4) and Group B (double walls B, B1, B2, B3, B4) were constructed, and the sound transmission loss of these double walls was measured. Moreover, the sound transmission loss in the case of only the RC wall X having a thickness of 100 mm that blocks the through holes of the sound source chamber M and the sound receiving chamber L was measured. The additional wall 75 is constructed by attaching a plurality of gypsum boards 70 having a size of 910 mm × 1820 mm to a plurality of base pillars (studs) 33 arranged at intervals of 303 mm.

As shown in FIGS. 4A and 5A, the double wall group A includes an upper edge 70a of the gypsum board 70 forming the additional wall 75 and an upper edge surface 60a (ceiling slab) of the above-described through hole. Between the lower edge 70b of the gypsum board 70 that forms the additional wall 75 and the lower edge surface 60b (floor surface) of the through-hole, and the left edge 70c of the gypsum board 70 that forms the additional wall 75. Between the right edge surface 70d of the gypsum board 70 forming the additional wall 75 and the right edge surface 60d of the through hole, so as not to provide a gap (gap = opening). The gypsum board 70 (wall plate 7) is a double wall group configured such that the upper end surface of the gypsum board 70 and the ceiling slab surface are in contact with each other, and the lower end surface of the gypsum board 70 and the floor surface are in contact with each other. The structure of the wall is as follows.
・ Double wall A = double wall without porous fiber sound-absorbing material in air layer 6 ・ Double wall A1 = in the form of a plate having a thickness of 50 mm on the entire surface (back surface) of the gypsum board 70 by the pasting nonwoven 60 as a porous fiber sound-absorbing material of the formation density 8 kg / m ^3, double-walled, double-walled construction with a nonwoven 60 of density 8 kg / m ³ in the air layer 6 A2 = A non-woven fabric 60 as a porous fiber sound-absorbing material having a density of 16 kg / m ³ formed in the shape of a plate having a thickness of 50 mm is attached to the entire surface of the gypsum board 70 on the boundary wall side, whereby a density of 16 kg / Double wall / double wall A3 having a configuration comprising m ³ nonwoven fabric 60 = porous fiber having a density of 24 kg / m ³ formed in a plate shape having a thickness of 50 mm on the entire surface of the gypsum board 70 on the side of the boundary wall By pasting the nonwoven fabric 60 as a sound absorbing material, Care layer 6 of configurations with non-woven fabric 60 of a density 24 kg / ^{m 3} double wall, double wall A4 = density is formed in a plate shape having a thickness of 50mm on the entire surface of Sakaikabe side surface of the gypsum board 70 48 kg / as by attaching a glass wool 60A of the porous fibrous sound absorbing material of ^{m 3,} construction of a double wall with a glass wool 60A of density 48 kg / ^{m 3} in the air layer 6

As shown in FIGS. 4B and 5B, the double wall group B includes an upper edge 70a of the gypsum board 70 forming the additional wall 75 and an upper edge surface 60a (ceiling slab surface) of the through hole. Between the lower edge 70b of the gypsum board 70 forming the additional wall 75 and the lower edge surface 60b (floor surface) of the through hole, respectively, with an interval (gap) S of 100 mm. Heavy wall group (that is, a double wall group configured such that the upper end surface of the gypsum board 70 (wall plate 7) and the ceiling slab surface are separated from each other, and the lower end surface of the gypsum board 70 and the floor surface are separated from each other). The structure of each double wall is as follows.
Double wall B = double wall without porous fiber sound-absorbing material in air layer 6Double wall B1 = formed in the form of a plate having a thickness of 50 mm on the entire surface of the gypsum board 70 on the side of the boundary wall by pasting the nonwoven 60 as a porous fiber sound-absorbing material of density 8 kg / m ^3, double-walled, double-walled B2 = gypsum board arrangement with a nonwoven 60 of density 8 kg / m ³ in the air layer 6 by pasting the nonwoven 60 as a porous fiber sound absorbing material density are formed in a plate shape of the entire surface to a thickness of 50mm of Sakaikabe side surface 16 kg / ^{m 3} of 70, the air layer 6 of density 16 kg / ^{m 3} Double wall / double wall B3 comprising a nonwoven fabric 60 = as a porous fiber sound-absorbing material having a density of 24 kg / m ³ formed in the form of a plate having a thickness of 50 mm on the entire surface of the gypsum board 70 on the boundary wall side By pasting the non-woven fabric 60, the air layer 6 Density 24 kg / of ^{m 3} of configurations with non-woven fabric 60 double wall, double wall B4 = gypsum board 70 of Sakaikabe side entire surface to a thickness of 50mm plate which is formed in a density 48 kg / ^{m 3} Double wall having a structure in which glass wool 60A having a density of 48 kg / m ³ is provided in air layer 6 by attaching glass wool 60A as a porous fiber sound absorbing material.

  Numerical data based on the measurement results of the sound transmission loss of the RC wall X and the double wall A group and the double wall B group are shown in FIG. 6, and the sound transmission loss of the RC wall X and the double wall A group is measured. The graph by a result is shown in FIG. 7, and the graph by the measurement result of the sound transmission loss of RC wall X and the double wall B group is shown in FIG.

As can be seen from the measurement results, when the values of the sound transmission loss of the 1/3 octave band having a center frequency of 100 Hz in the double wall A group are compared, the double wall A is 33.7 and the double wall A1. Is 33.2, double wall A2 is 33.4, double wall A3 is 31.3, and double wall A4 is 29.7. That is, the double wall A1 including the non-woven fabric 60 having a density of 8 kg / m ^{3 and} the double wall A2 including the non-woven fabric 60 having a density of 16 kg / m ³ include the double wall A3 including the non-woven fabric 60 having a density of 24 kg / m ^3. It can be seen that the sound insulation performance in the 100 Hz band is superior to the double wall A4 provided with the glass wool 60A having a density of 48 kg / m ³ .
The double wall A that does not include the porous fiber sound-absorbing material in the air layer 6 is excellent in sound insulation performance in a band of 100 Hz or less, but the sound insulation performance in the 125 Hz band to 500 Hz band is double wall A1, A2, A3. Is inferior to.
That is, the double wall A1 provided with the nonwoven fabric 60 having a density of 8 kg / m ^{3 and} the double wall A2 provided with the nonwoven fabric 60 having a density of 16 kg / m ³ have a sound insulation performance higher than that of the RC wall X in a band higher than 125 Hz. Even in the band of 125 Hz or less, the sound insulation performance is only slightly lower than the RC wall X, so the sound insulation performance is excellent, but the double wall A3 provided with the non-woven fabric 60 with a density of 24 kg / m ³ and the density of 48 kg. In the double wall A4 having the glass wool 60A of / m ³ , the sound insulation performance was lowered in the 100 Hz band.
Therefore, according to the experiment, the gypsum board 70 (wall plate 7) is provided so that no gap is provided between the lower end surface of the gypsum board 70 and the floor surface or between the upper end surface of the gypsum board 70 and the ceiling slab surface. In the double wall where the lower end surface of the gypsum board 70 and the floor surface are in contact with each other and the resonance frequency of the air layer 6 is in the 100 Hz band. According to the double wall of the structure in which the nonwoven fabric 60 as a porous fiber sound absorbing material having a density of 8 kg / m ³ or a density of 16 kg / m ³ is provided in the air layer 6 of the heavy wall, that is, according to the double wall of the second embodiment. In the wall structure in which the space between the double wall air layers can be reduced and the room can be widened, and the resonance frequency by the air spring of the air layer 6 is in the 100 Hz band, the sound insulation performance in the 100 Hz band and the 100 Hz band It has been demonstrated that the outside of the sound insulation performance superior double wall.
In other words, it was thought that the use of a material having a high density as the porous fiber sound-absorbing material was considered to have a good sound insulation performance. It was revealed.

Further, as can be seen from the measurement results, when the values of the sound transmission loss of the 1/3 octave band having a center frequency of 100 Hz in the double wall B group are compared, the double wall B is 35.0, double The wall B1 is 34.2, the double wall B2 is 34.5, the double wall B3 is 32.5, and the double wall B4 is 30.3. That is, the double wall B1 provided with the nonwoven fabric 60 having a density of 8 kg / m ^{3 and} the double wall B2 provided with the nonwoven fabric 60 having a density of 16 kg / m ³ are combined with the double wall B3 having the nonwoven fabric 60 having a density of 24 kg / m ^3. It can be seen that the sound insulation performance in the 100 Hz band is superior to the double wall B4 provided with glass wool 60A having a density of 48 kg / m ³ .
The double wall B that does not include the porous fiber sound-absorbing material in the air layer 6 is excellent in sound insulation performance in the band of 100 Hz or less, but the sound insulation performance in the band of 125 Hz to 1000 Hz is double wall B1, B2, B3. Is inferior to.
That is, the double wall B1 provided with the non-woven fabric 60 having a density of 8 kg / m ^{3 and} the double wall B2 provided with the non-woven fabric 60 having a density of 16 kg / m ³ have a sound insulation performance higher than that of the RC wall X in a band higher than 125 Hz. Even in the band below 125 Hz, the sound insulation performance is only slightly lower than the RC wall X, so the sound insulation performance is excellent, but the double wall B3 provided with the nonwoven fabric 60 with a density of 24 kg / m ³ and the density of 48 kg. In the double wall B4 provided with the glass wool 60A of / m ³ , the sound insulation performance was lowered in the 100 Hz band.
Therefore, according to the experiment, an interval S of 100 mm is provided between the lower end surface of the gypsum board 70 and the floor surface, and between the upper end surface of the gypsum board 70 and the ceiling slab surface, and the air layer 6 In the double wall having a resonance frequency of 100 Hz, the air layer 6 of the double wall includes a nonwoven fabric 60 as a porous fiber sound-absorbing material having a density of 8 kg / m ³ or a density of 16 kg / m ^3. According to the double wall, that is, the double wall of the first embodiment, the space between the double wall air layers can be reduced and the room can be widened, and the resonance frequency of the air spring of the air layer 6 is 100 Hz. It was demonstrated that the wall structure is a double wall excellent in sound insulation performance in the 100 Hz band and sound insulation performance other than in the 100 Hz band.
In addition, between the upper end surface of the gypsum board 70 (wall plate 7) constituting the additional wall 75 and the ceiling slab surface, and between the lower end surface of the gypsum board 70 constituting the additional wall 75 and the floor surface, Although the experiment was not performed on the double wall having the configuration in which one side is separated and the other is in contact, the above experimental results show that the room can be widened even if the double wall has the configuration. This is considered to be a double wall that can suppress a decrease in sound insulation performance based on the influence of the resonance frequency of the air spring.

In the above, the air layer 6 of the double wall, has been exemplified double wall structure having a density of 8 kg / m ³ or nonwoven 60 of density 16 kg / m ^3, the air layer 6 of the double wall, It is good also as a double wall of the structure provided with other porous fiber sound-absorbing materials, such as glass wool of density 8kg / m < ³ > or density 16kg / m < ³ >, or rock wool.
Further, the air layer 6 of the double wall may be a double wall structure having a porous fibrous sound absorbing material of density 8 kg / ^{m 3} ~ density 16 kg / ^{m 3.} In addition, for example, as a nonwoven fabric formed in a plate shape, a density of 16 kg / m ^{3, a} density of 24 kg / m ³ , a density of 32 kg / m ³ , a density of 40 kg / m ³ , a density of 48 kg / m ³ , a density of 64 kg / m ³ , a density while those of 96 kg / ^{m 3} are commercially available, it may be used to prepare any density nonwoven in the density range of 8 kg / ^{m 3} ~ density 16 kg / ^{m 3.}
Moreover, in the above, the double-walled air layer 6 in which the resonance frequency of the air spring of the air layer 6 is 100 Hz is provided with a porous fiber sound-absorbing material having a density of 8 kg / m ³ to a density of 16 kg / m ³ . Although the double wall is illustrated, for example, the distance between the air layers of the double wall is 60.5 mm (finished thickness 70 mm—gypsum board 9.5 mm) to 50.5 mm (finished thickness 60 mm—gypsum board 9 And a double-walled air layer 6 having a resonance frequency of 125 Hz in the air layer and a porous fiber sound-absorbing material having a density of 8 kg / m ³ to a density of 16 kg / m ^3. It may be a wall.
Even with the double wall configured as described above, the space between the air walls of the double wall can be reduced and the room can be widened, and the resonance frequency of the air spring of the air layer is 100 Hz to 125 Hz. In the wall structure, it can be estimated that a double wall excellent in sound insulation performance in the 100 Hz band to 125 Hz band and sound insulation performance other than in the 100 Hz band to 125 Hz band can be obtained.

5 wall, 6 air layer, 7 wall board, 60 non-woven fabric (porous fiber sound absorbing material),
60A (porous fiber sound absorbing material).

Claims (6)

In the double wall which is a wall structure including a boundary wall and an additional wall formed by providing a wall plate in front of the boundary wall through an air layer,
A double wall comprising a porous fiber sound-absorbing material having a density of 8 kg / m ³ to a density of 16 kg / m ^{3 in} an air layer.   The upper end surface of the wall plate constituting the additional wall and the ceiling slab surface are separated from each other, and the lower end surface of the wall plate constituting the additional wall and the floor surface are separated from each other. Heavy wall.   The upper end surface of the wall plate constituting the additional wall and the ceiling slab surface are brought into contact with each other, and the lower end surface of the wall plate constituting the additional wall and the floor surface are brought into contact with each other. Heavy wall.   Between the upper end surface of the wall plate constituting the additional wall and the ceiling slab surface, between the lower end surface of the wall plate constituting the additional wall and the floor surface, one is separated and the other is contacted The double wall according to claim 1.   The double wall according to any one of claims 1 to 4, wherein a resonance frequency of the air spring of the air layer is in a 100 Hz band.   The double wall according to any one of claims 1 to 5, wherein the porous fiber sound-absorbing material is nonwoven fabric, glass wool, or rock wool.

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