JP2023040738A - Additional wall and wall structure - Google Patents

Abstract

To provide an additional wall that can be installed independently without causing an increase in the wall thickness.SOLUTION: An additional wall 1 comprises: a cross-sectional view L-shaped first bearing member 11 that includes an upper plate 11A fixed to a ceiling 91 and a hanging plate 11B hanging from the end part of a wall body 90 side of the upper plate 11A and placed isolated from the wall body 90; a cross-sectional view L-shaped second bearing member 12 that includes a lower plate 12A fixed to a floor 92 and a raising plate 12B rising from the end part of the wall body 90 side of the lower plate 12A and placed isolated from the wall body 90; a sheathing layer 20 consisting of multiple pieces of sheathing 21 bridged and mounted between the hanging plate 11B and the raising plate 12B and placed isolated from the wall body 90; a first gypsum board layer 30 consisting of multiple gypsum boards 31 mounted at an indoor side of the sheathing layer 20; and a second gypsum board layer 40 consisting of multiple gypsum boards 41 mounted at an indoor side of the first gypsum board layer 30. The sheathing layer 20 is only supported with the first bearing member 11 and the second bearing member 12.SELECTED DRAWING: Figure 2A

Description

The present invention relates to additional walls and wall structures provided along walls of buildings.

In order to improve the sound insulation performance of a wall, there is a method of providing an additional wall to a wall such as a partition wall and forming an air layer between the wall and the additional wall to suppress the transmission of vibration. For example, in Patent Document 1, there is a double wall in which a plurality of studs are erected in front of the partition wall and a face material is attached, and an air layer formed between the partition wall and the face material is used to insulate sound. Are listed.

JP 2019-033929 A

In order to improve the sound insulation performance, it is desirable that the additional wall is self-supporting and that the wall body and the additional wall do not come into contact with each other. However, when studs are erected to make the additional wall stand on its own, there is a problem that the thickness of the wall increases greatly, making the room narrower.
The present invention has been made to solve such problems, and an additional wall that can be installed independently while suppressing an increase in wall thickness, and an increase in thickness while having high sound insulation performance. To provide a wall structure capable of suppressing

In order to solve such a problem, an additional wall according to the present invention is an additional wall provided in a room along a wall, comprising an upper plate fixed to the ceiling and hanging from the end of the upper plate on the wall side. A first support member having an L-shaped cross-sectional view and including a hanging plate spaced apart from the wall, a lower plate fixed to the floor, and the wall rising from the end of the lower plate on the wall side. a second support member having an L-shaped cross-sectional view and a riser plate spaced apart from each other; a first gypsum board layer made of a plurality of gypsum boards installed on the indoor side of the base board layer; and a plurality of gypsum installed on the indoor side of the first gypsum board layer. a second gypsum board layer made of board, wherein the base plate layer is supported only by the first support member and the second support member.

According to the present invention, it is possible to provide a self-supporting additional wall that suppresses an increase in wall thickness.

FIG. 4 is a front view showing an example of an additional wall according to the present invention; 1 is a sectional view showing an example of an additional wall and a wall structure according to the present invention; FIG. 2B is an enlarged view of the vicinity of the ceiling and floor of FIG. 2A; FIG. FIG. 4 is a perspective view showing an example of first and second support members arranged on the ceiling and floor; FIG. 3 is a cross-sectional view showing an example of a wall structure in which an air layer is filled with an under carpet material (soft sheet-like member); FIG. 4 is a cross-sectional view showing an example of a wall structure in which two additional walls according to the present invention are installed so as to sandwich a wall body; FIG. 10 is a front view showing an example of a state in which the first and second support members are installed in the additional wall installation step according to the present invention; FIG. 10 is a front view showing an example of a state in which the base plate layer is installed on the first and second support members in the installation step of the additional wall according to the present invention; FIG. 4 is a front view showing an example of a state in which the first gypsum board layer is installed on the base plate layer in the step of installing the additional wall according to the present invention. FIG. 4 is a front view showing an example of a state in which the second gypsum board layer is installed on the first gypsum board layer in the step of installing the additional wall according to the present invention; 4 is a graph showing improvement in sound insulation performance by additional walls and wall structures according to the present invention.

An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1-2B, the additional wall 1 according to the embodiment is provided in the room along the wall body 90, and includes a first support member 11 and a second support member 12 having an L-shaped cross section, and a base plate. It comprises a layer 20 , a first gypsum board layer 30 and a second gypsum board layer 40 .
The wall 90 is a part of the building in which the additional wall 1 is installed, and has a surface 90A extending from the ceiling 91 to the floor 92 inside the room.

(first and second support members)
The first and second support members 11 and 12 are members fixed to the indoor ceiling 91 and floor 92 . The first and second support members 11 and 12 are plate-like members having an L-shaped cross section, and are fixed to a ceiling 91 and a floor 92 as shown in FIG. 3, for example. Note that FIG. 3 also shows the cross-sectional shapes of the first and second support members 11 and 12 .
The first support member 11 has an upper plate 11A and a hanging plate 11B. The upper plate 11A faces the ceiling 91 and is fixed to the ceiling 91 . The hanging plate 11B hangs down from the end of the top plate 11A on the side of the wall 90 at an angle of 90 degrees with the top plate 11A. The hanging plate 11</b>B is arranged along the wall 90 so as to be separated from the wall 90 , and the first support member 11 is separated from the wall 90 .
The second support member 12 has a lower plate 12A and a rising plate 12B. The lower plate 12A faces the floor 92 and is fixed to the floor 92 . The rising plate 12B rises from the end of the lower plate 12A on the side of the wall body 90 at an angle of 90 degrees with the lower plate 12A. The rising plate 12</b>B is arranged along the wall 90 so as to be separated from the wall 90 , and the second support member 12 is separated from the wall 90 .

The first and second support members 11 and 12 can be made of steel plates having a thickness of 0.4 mm to 1 mm, for example. In the case of a steel plate having a thickness of 0.4 mm to 1 mm, the length of one side in a cross-sectional view is preferably 4 cm or more in order to obtain sufficient fixing strength.
The first and second support members 11 and 12 are arranged across the width direction of the wall 90 in the room. The first and second support members 11 and 12 may each be a single member having a length in the width direction of the wall body 90 in the room, or a plurality of members may be connected and arranged.

(Backing plate layer)
The base board layer 20 is the base of the additional wall 1, and is a layer arranged on the wall body 90 side of the first and second gypsum board layers described later. The base plate layer 20 is separated from the wall 90 , and an air layer 50 is formed between the wall 90 and the base plate layer 20 .
The base plate layer 20 is composed of a plurality of base plates 21 . The base plate 21 is a rectangular plate-like member whose height dimension is the length from the lower surface of the upper plate 11A of the first support member 11 to the upper surface of the lower plate 12A of the second support member 12, and is a hanging plate. It is installed on the indoor side of 11B and the rising plate 12B, straddling the hanging plate 11B and the rising plate 12B. The base plates 21 are arranged without gaps in the width direction of the wall 90 so as to cover the entire wall 90 on the indoor side.

The base plate layer 20 is supported only by the first support member 11 and the second support member 12 . The upper end of the base plate 21 is fixed to the hanging plate 11B with screws or the like. A lower end portion of the base plate 21 is fixed to the rising plate 12B with screws or the like. The screw or the like should have a length such that the tip of the screw or the like is separated from the wall body 90 after being fixed. For vibration isolation between the additional wall 1 and the wall body 90, it is important that the screws do not come into contact with the wall body 90. , 1 mm or more.
The base plate 21 is strong enough to stand on its own, and is preferably a wood-based surface material with a thickness of 9 mm or more so that it can hold screws as a base for attaching the first gypsum board described later with screws. As the wood-based face material, for example, structural plywood such as conifer plywood or particle board can be used.

(First and second gypsum board layers)
The first and second gypsum board layers 30 and 40 are the main layers of the additional wall 1 and are arranged on the interior side of the base plate layer 20 .
The first gypsum board layer 30 is composed of a plurality of gypsum boards 31 installed on the indoor side of the base plate layer 20 . The gypsum boards 31 are arranged without gaps so as to cover the entire wall body 90 on the indoor side. The gypsum board 31 is fixed to the base plate 21 with screws, staples, or the like. The gypsum board 31 may also be fixed using an adhesive.
The second gypsum board layer 40 is composed of a plurality of gypsum boards 41 installed on the indoor side of the first gypsum board 30 layer. The gypsum boards 41 are arranged without gaps so as to cover the entire wall body 90 on the indoor side. The gypsum board 41 is fixed by screws, staples, or the like. The gypsum board 41 may also be fixed using an adhesive. When fixing with screws, it is fixed to the base plate 21 . When it is fixed with staples, it is fixed to the base plate 21 or the gypsum board 31 of the first gypsum board layer 30 .

Commercially available gypsum boards 31 and 41 can be used. From the viewpoint of strength and sound insulation, the thickness of the gypsum boards 31, 41 is preferably 21 mm or more.
Further, in order to give the additional wall 1 a certain level of fireproof performance, the gypsum boards 31 and 41 can be reinforced gypsum boards (reinforced gypsum boards) defined in JIS A6901. For example, by using a reinforced gypsum board having a thickness of 21 mm as the gypsum boards 31 and 41, strength and sound insulation performance can be enhanced, and fire resistance performance can be given, for example, for one hour. By using a reinforced gypsum board thicker than 21 mm for the gypsum boards 31 and 41, the strength, sound insulation and fireproof performance of the additional wall 1 can be further enhanced.

(wall structure)
Next, a wall structure including the additional wall 1 and the wall body 90 will be described. The wall structure 2 includes a wall body 90, an additional wall 1, and an air layer 50 between the wall body 90 and the additional wall 1, as shown in FIGS. 2A and 2B. From the viewpoint of sound insulation, the thickness D1 of the air layer 50 is preferably 5 mm or more. For example, the thickness D1 of the air layer 50 is 5 mm, the base plate 21 is a wood-based face material with a thickness of 9 mm, and the gypsum boards 31 and 41 of the first and second gypsum board layers 30 and 40 are 21 mm thick. In the case of a reinforced gypsum board, the increase D2 in wall thickness due to the provision of the additional wall 1 is 56 mm.

The air layer 50 may be filled with a soft sheet-like member 51 having sound absorption properties. The soft sheet-like member 51 is a sheet-like member made of a material having a porous structure such as urethane containing air bubbles, glass wool, felt, or non-woven fabric, and capable of absorbing sound. In addition, the base plate 21 may bend during construction of the additional wall 1 . By filling the air layer 50 with the soft sheet-like member 51, the bending of the base plate 21 during construction can be suppressed.

Among the soft sheet-like members 51, a non-woven fabric is preferable because it is lightweight and can have an appropriate hardness. If the hardness is insufficient, the force to push back is weak, and the bending of the base plate 21 during construction cannot be sufficiently suppressed. On the other hand, if it is too hard, the vibration insulation between the wall member 90 and the additional wall 1 will be hindered, and the sound insulation performance will be reduced by transmitting the vibration. Appropriate hardness is hardness that achieves both suppression of bending of the base plate 21 during construction and vibration isolation. Examples of materials for the non-woven fabric-like soft sheet-like member 51 include chemical fibers such as polyethylene, cotton, glass, and recycled fibers.

It is also preferable to use an under carpet material 52 as the soft sheet-like member 51 . In the wall structure 3 whose example is shown in FIG. 4, an air layer 50 is filled with an under carpet material 52 . The hardness of the under carpet material 52 is suitable for suppressing bending of the base plate 21 during construction. The undercarpet material 52 is widely available as a base material for floors, and is therefore readily available and inexpensive. Moreover, if the material supplied in a roll form is used, it is easy to handle even in the construction of a large area.
Also, two additional walls 1 can be provided so as to sandwich the wall body 90 . A wall structure 4 exemplified in FIG. 5 is a three-row wall including a wall 90 , and includes the wall 90 , two additional walls 1 sandwiching the wall 90 , and an air layer 50 . The air layer 50 may be filled with a sound-absorbing soft sheet-like member 51 such as an under carpet material 52 .

(Positional relationship of joints)
Each layer of the additional wall 1 has joints. That is, the base plate layer 20 has vertical joints between the base plates 21 adjacent to each other. The first gypsum board layer 30 has vertical or horizontal joints between adjacent gypsum boards 31 . The second gypsum board layer 40 has vertical or horizontal joints between adjacent gypsum boards 41 . From the viewpoint of sound insulation and fire resistance, the joints between the base plate 21 and the gypsum board 31 and between the gypsum boards 31 and 41 are not overlapped. Here, the positional relationship of the joints between each layer will be described along the order of construction with reference to FIGS. 6A to 6D. 6A-6D are front views looking toward the wall 90 from the inside of the room.

First, as an example is shown in FIG. 6A, the first and second support members 11 and 12 are separated from the wall 90 and fixed to the ceiling 91 and the floor 92 . Subsequently, the base plate layer 20 is formed by fixing the base plate 21 to the hanging plate 11B of the first support member 11 and the rising plate 12B of the second support member 12, as shown in FIG. 6B. Vertical joints 21V are formed between the base plates 21 .
Subsequently, a first gypsum board layer 30 is formed by fixing a gypsum board 31 to the base board 21 as shown in FIG. 6C. Vertical joints 31V and horizontal joints 31H are formed between the gypsum boards 31 . The vertical joints 31V are arranged so as not to overlap the vertical joints 21V of the base plate layer 20 .
Subsequently, a second gypsum board layer 40 is formed by fixing a gypsum board 41 to the gypsum board 31 as shown in FIG. 6D. Vertical joints 41V and horizontal joints 41H are formed between the gypsum boards 41 . The vertical joints 41V are arranged so as not to overlap the vertical joints 31V of the first gypsum board layer 30 . Further, the lateral joints 41H are arranged so as not to overlap the lateral joints 31H of the first gypsum board layer 30 .

That is, in the additional wall 1, as shown in FIG. 6D, the vertical joint 31V of the first gypsum board layer 30 is horizontally spaced from the vertical joint 21V of the base plate layer 20. , the vertical joint 41V of the second gypsum board layer 40 is arranged at a position horizontally separated from the vertical joint 31V of the first gypsum board layer 30. As shown in FIG. Further, the horizontal joint 41H of the second gypsum board layer 40 is arranged at a position vertically separated from the horizontal joint 31H of the first gypsum board layer 30. As shown in FIG.
The length-to-width ratio and the number of sheets of the base plate 21 and the gypsum boards 31 and 41 are not limited to the examples shown in FIGS. 6B to 6D, and can be freely set.

Next, the effect of the additional wall 1 and the wall structure 2-4 according to the present invention will be explained.
The additional wall 1 according to the present invention is an additional wall provided inside the room along the wall body 90, and is a wall that hangs down from the upper plate 11A fixed to the ceiling 91 and the end of the upper plate 11A on the wall body 90 side. From the first support member 11 having an L-shaped cross-section having the hanging plate 11B spaced apart from the body 90, the lower plate 12A fixed to the floor 92, and the end portion of the lower plate 12A on the side of the wall 90 A second supporting member 12 having an L-shaped cross-sectional view and having a standing wall 90 and a standing plate 12B spaced apart, and a hanging plate 11B and a standing plate 12B are installed and separated from the wall 90. A baseboard layer 20 made up of a plurality of baseboards 21 arranged in parallel, a first gypsum board layer 30 made up of a plurality of gypsum boards 31 installed on the indoor side of the baseboard layer 20, and a first gypsum board layer 30 and a second gypsum board layer 40 made up of a plurality of gypsum boards 41 installed on the indoor side of the second gypsum board layer 20 .

With this configuration, the additional wall 1 has the upper plate 11A of the first supporting member 11 having an L-shaped cross section fixed to the ceiling 91, and the lower plate 12A of the second supporting member 12 having an L-shaped cross section to the floor 92. The base plate 21 is installed across the hanging plate 11B of the first support member 11 and the rising plate 12B of the second support member 12 to form the base plate layer 20, and the base plate layer 20 is the first support member. 11 and the second support member 12 only. By setting the first gypsum board layer 30 on the base plate layer 20 and setting the second gypsum board layer 40 on the first gypsum board layer 30, the additional wall 1 can stand on its own without providing studs. can. As a result, a self-supporting wall with a reduced thickness can be realized, and by reducing the thickness, a wider indoor space can be secured.
Since the first support member 11, the second support member 12, and the base plate layer 20 are separated from the wall body 90, the additional wall 1 can stand on its own without coming into contact with the wall body 90. Transmission of vibration between the wall 1 and the wall body 90 can be suppressed. Thereby, the additional wall 1 can improve the sound insulation performance while suppressing the thickness.

In the additional wall 1 according to the present invention, the base plate 21 of the base plate layer 20 is preferably a wood-based surface material having a thickness of 9 mm or more.
With such a configuration, the additional wall 1 can be made a stronger self-supporting wall by using the base board 21 as a wood-based surface material having a thickness of 9 mm or more.

In the additional wall 1 according to the present invention, the gypsum boards 31, 41 of the first gypsum board layer 30 and the second gypsum board layer 40 are preferably reinforced gypsum boards having a thickness of 21 mm or more.
With such a configuration, the additional wall 1 is provided with two gypsum board layers 30 and 40 each made of gypsum board with a thickness of 21 mm or more, so that the out-of-plane rigidity can be increased, and the strength and sound insulation performance can be further improved. can be improved. The additional wall 1 can achieve, for example, one-hour fire resistance performance by using a reinforced gypsum board having a thickness of 21 mm or more for the gypsum boards 31 and 41 . By providing the additional wall 1 with fireproof performance, the additional wall 1 side of the wall body 90 can be made unnecessary for fireproof coating, and a wider indoor space can be secured.

In the additional wall 1 according to the present invention, the vertical joint 31V of the first gypsum board layer 30 is arranged at a position horizontally separated from the vertical joint 21V of the base plate layer 20, and the second gypsum board The vertical joint 41V of layer 40 is horizontally spaced from the vertical joint 31V of the first gypsum board layer 30, and the horizontal joint 41H of the second gypsum board layer 40 is located at the second It is preferable that the joints 31</b>H of the one gypsum board layer 30 are vertically spaced apart from each other.
With this configuration, the additional wall 1 is installed so that the joints between the layers do not overlap, and the sound insulation and fireproof performance can be further improved.

The wall structure 2 according to the present invention has an air layer 50 with a thickness of 5 mm or more between the wall body 90 and the additional wall 1 .
With such a configuration, the wall structure 2 has the air layer 50 with a thickness of 5 mm or more, so that high sound insulation performance can be achieved. Further, for example, the thickness D1 of the air layer 50 is 5 mm, the base plate 21 is a wood-based face material with a thickness of 9 mm, and the gypsum boards 31 and 41 of the first and second gypsum board layers 30 and 40 are 21 mm thick. Even in the case of a reinforced gypsum board having a thickness of 10 mm, the increase in wall thickness D2 due to the provision of the additional wall 1 is 56 mm. can do.

In the wall structure 3 according to the present invention, the air layer 50 is preferably filled with a soft sheet-like member 51 having sound absorption properties.
With such a configuration, the wall structure 3 absorbs sound by the soft sheet-like member 51, further enhancing the sound insulation performance, and suppressing the bending of the base plate 21 during construction, thereby improving construction efficiency.

In the wall structure 3 according to the present invention, the soft sheet-like member 51 is preferably made of non-woven fabric.
The soft sheet-like member 51 made of non-woven fabric is lightweight, and can have a hardness that simultaneously suppresses the bending of the base plate 21 during construction and provides vibration isolation. With such a configuration, the wall structure 3 can further improve the sound insulation performance and further improve the construction efficiency.

In the wall structure 3 according to the present invention, the soft sheet-like member 51 is preferably an undercarpet material 52 .
The undercarpet material 52 has a hardness suitable for suppressing the bending of the base plate 21 during construction, and is widely available as a base material for floors, so it is easy to obtain and inexpensive. Moreover, if the material supplied in a roll form is used, it is easy to handle even in the construction of a large area. With such a configuration, the wall structure 3 can further improve the sound insulation performance, and further improve the construction efficiency while suppressing the cost.

(Example)
Next, the improvement of sound insulation performance by the additional wall and wall structure according to the present invention will be described.
FIG. 5 is a cross-sectional view showing an example of the wall structure 4 already described, in which rooms are adjacent to each other on the left and right with the wall structure 4 as a boundary. Using the inter-room sound pressure level difference between adjacent rooms as an index, it was confirmed that the additional wall and wall structure according to the present invention improved the sound insulation performance. Here, the inter-room sound pressure level difference is the difference in sound pressure level between the left and right rooms when the sound source is placed in either the left or right room. In order to compare the sound insulation performance, the inter-room sound pressure level difference was measured for the cases where the boundaries between the left and right rooms were set as the comparative example, the first example, and the second example.

A comparative example is a case where only the wall 90 is used as the boundary between the left and right rooms in FIG. Example 1 is a case where the additional wall 1 is provided only on the right side (or the left side) of the wall body 90 to form two rows of walls. Example 2 is a case in which additional walls 1 are provided on both left and right sides of a wall body 90 to form three rows of walls.
In the additional wall 1, the base plate 21 is made of soft plywood with a thickness of 9 mm, and the gypsum boards 31, 41 of the first and second gypsum board layers 30, 40 are made of reinforced gypsum boards with a thickness of 21 mm. The air layer 50 has a thickness D1 of 5 mm and is filled with an under carpet material 52 . The increase in wall thickness D2 by providing one additional wall 1 is 56 mm. The substrate board 21, the gypsum boards 31 and 41, and the under carpet material 52 were all commercially available.

The inter-room sound pressure level difference is measured according to the measurement standards recommended by the Architectural Institute of Japan D. 1 "Measurement method of sound pressure level difference at building site".
FIG. 7 shows the measurement results of the sound pressure level difference between rooms. The sound pressure level difference (unit [dB]) shown on the vertical axis in FIG. 7 is the difference between the sound pressure levels measured in one room in which the sound source is placed and in the other room in which the sound source is not placed. The horizontal axis is frequency (unit [Hz]).

The dotted line graph in Figure 7 is the grade curve specified in Annex 1 of JIS A 1419-1:2000, and the frequency characteristics of the airborne noise insulation performance for each grade from D-25 to D-60. represent. The larger the number following D, the higher the sound insulation performance.
The solid line graphs in FIG. 7 are the measurement results of Comparative Example, Example 1, and Example 2, and the vertical axis indicates the graphs of Comparative Example, Example 1, and Example 2 in ascending order of sound pressure level difference. . Although the comparative example is lower than D-35 at some frequencies, it exceeds D-30 at all frequencies, and the sound insulation grade of the comparative example is D-30. Example 1 had no frequencies below D-45, giving it a sound insulation rating of D-45. Example 2 had no frequencies below D-50, and the sound insulation grade of Example 2 was D-50.

The sound insulation grade D-30 is, for example, the sound insulation performance of walls between rooms in a detached house, and is not sufficient as the sound insulation performance of walls between adjacent houses in a collective housing. On the other hand, the sound insulation grade D-50 is a sound insulation performance standard set by the Architectural Institute of Japan for living rooms in collective housing, and corresponds to grade 1 for a parting wall between adjacent houses. Grade 1 is excellent in terms of sound insulation performance and is considered a desirable performance level recommended by the Architectural Institute of Japan. Similarly, D-45 corresponds to class 2 of the partition wall between adjacent houses, and class 2 is standard in terms of sound insulation performance and is considered a general performance level.

That is, the wall body 90 is provided with the additional wall 1 according to the present invention and has a two-row wall structure, so that the sound insulation grade is improved by three grades from D-30 to D-45, which is standard as a parting wall between adjacent houses. good sound insulation performance can be obtained. The increase in wall thickness is 56 mm, and the impact on the interior space is also suppressed. Furthermore, if two additional walls 1 are provided so as to sandwich the wall body 90 to form a three-row wall, the sound insulation grade is improved by four grades from D-30 to D-50, which is the preferable sound insulation performance level recommended by the Architectural Institute of Japan. It can be a parting wall between adjacent houses that satisfies Even in this case, the increase in wall thickness is a total of 112 mm, an increase of 56 mm for each room. The additional wall and wall structure according to the present invention can greatly improve sound insulation performance while suppressing an increase in wall thickness.

It has been explained that the base plate 21 is installed on the indoor side of the hanging plate 11B and the rising plate 12B. Alternatively, the base plate 21 may be installed on the wall 90 side of the hanging plate 11B and the rising plate 12B. Also, the first support member 11 may be installed in a direction in which the hanging plate 11B hangs down from the end of the upper plate 11A on the indoor side. Similarly, the second support member 12 may be installed in an orientation in which the rising plate 12B rises from the indoor-side end of the lower plate 12A.
As the wall structure 4, it has been explained that two additional walls 1 are provided so as to sandwich the wall body 90 to form a three-row wall. Since each of the additional walls 1 is a self-supporting wall, two additional walls 1 can be provided in a place where there is no wall body 90 to form a two-row wall. In this case, the two additional walls 1 are provided separated from each other, and the space between the two additional walls 1 may be an air layer, or may be filled with, for example, an undercarpet material or a nonwoven soft sheet-like member.

1 additional wall 2 wall structure (air layer)
3 Wall structure (soft sheet-like member, under carpet material)
4 wall structure (three rows of walls)
11 first support member 11A upper plate (first support member)
11B hanging plate (first support member)
12 second support member 12A lower plate (second support member)
12B rising plate (second supporting member)
20 base plate layer 21 base plate 30 first gypsum board layer 31 gypsum board (first gypsum board layer)
40 second gypsum board layer 41 gypsum board (second gypsum board layer)
50 air layer 51 soft sheet member 52 under carpet material 90 wall 91 ceiling 92 floor

Claims (8)

An additional wall provided in the room along the wall body,
a first support member having an L-shaped cross-section, which includes an upper plate fixed to the ceiling and a hanging plate hanging from an end of the upper plate on the wall side and arranged apart from the wall;
a second support member having an L-shaped cross section, which includes a lower plate fixed to the floor and a rising plate rising from the end of the lower plate on the wall side and arranged apart from the wall;
a base plate layer comprising a plurality of base plates installed across the hanging plate and the rising plate and spaced apart from the wall;
a first gypsum board layer made of a plurality of gypsum boards installed on the indoor side of the base board layer;
a second gypsum board layer made of a plurality of gypsum boards installed on the indoor side of the first gypsum board layer,
The base plate layer is supported only by the first support member and the second support member,
additional wall. The base plate of the base plate layer is a wood-based face material having a thickness of 9 mm or more,
Additional wall according to claim 1 . The gypsum boards of the first gypsum board layer and the second gypsum board layer are reinforced gypsum boards having a thickness of 21 mm or more,
An additional wall according to claim 1 or claim 2. The vertical joint of the first gypsum board layer is arranged at a position horizontally separated from the vertical joint of the base plate layer,
The vertical joints of the second gypsum board layer are horizontally spaced from the vertical joints of the first gypsum board layer, and the horizontal joints of the second gypsum board layer are located at the first It is arranged at a position separated in the vertical direction with respect to the lateral joint of one gypsum board layer,
Additional wall according to any one of claims 1 to 3. Having an air layer with a thickness of 5 mm or more between the wall and the additional wall according to any one of claims 1 to 4,
wall structure. The air layer is filled with a soft sheet-like member having sound absorption properties,
A wall structure according to claim 5. The soft sheet-like member is a non-woven fabric,
A wall structure according to claim 6. The soft sheet-like member is an under carpet material,
A wall structure according to claim 6 or claim 7.

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