JP2014114575A - Wall reinforcement structure, reinforcement wall, and wall reinforcement method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wall reinforcement structure, a reinforcement wall, and a wall reinforcement method for improving total sound insulation performance by dispersing a resonance transmission frequency even when the distance from an existing wall to a surface member is shortened.SOLUTION: A reinforcement wall 10 is provided with a wall reinforcement structure 20 outside an existing wall 11. The wall reinforcement structure 20 comprises a plurality of wall substrate members 21, a porous sound absorption member 25, and a surface member 30. The wall substrate members 21 are arranged at a predetermined interval with the existing wall 11 in parallel with the existing wall 11. A porous sound absorption member 25 which has a thickness larger than the distance from the existing wall 11 to the wall substrate members 21 is compressed and packed between the wall substrate members 21. A surface member 30 is arranged on outer surfaces of the wall substrate members 21 and the porous sound absorption member 25. The surface member 30 is formed by sticking two plaster boards 31, 32 differing in thickness together.

Description

  The present invention relates to a wall reinforcing structure that is provided outside an existing wall and reinforces the wall, a reinforcing wall including the wall reinforcing structure, and a wall reinforcing method.

  When renewing apartment buildings or hotel rooms, sound insulation may be reinforced. In this case, in order to improve the sound insulation performance, a surface member (board) is arranged apart from the existing wall, and an air layer may be formed between the existing wall and the surface member (for example, Patent Document 1). reference). In this document, a double-structured wall composed of a frame wall, a board parallel to the frame wall, and an air layer interposed between these wall materials is disclosed. In such a wall structure, the existing wall and the board act as masses, and a resonance transmission phenomenon between the air layer and the board may occur. Therefore, in the technique described in this document, in order to reduce this resonance transmission phenomenon, the air layer is divided by a partition material having the same length as the wavelength of the frequency near the peak of the resonance transmission intensity.

JP 2004-84339 A

  As described above, in the reinforcing wall, there is a problem in that sound insulation is reduced due to resonance of the board itself (coincidence effect) and sound insulation performance is lowered due to a resonance transmission phenomenon in which the air layer acts as a spring and the board acts as mass. Due to this resonance transmission phenomenon, the sound insulation performance at the resonance transmission frequency (usually around 125 Hz) is lowered. In this case, in this frequency band, it is known that the sound insulation performance is lower than that of the existing wall alone. Therefore, conventionally, a decrease in sound insulation performance due to a resonance transmission phenomenon has been avoided by securing 100 mm or more as an interval (air layer) from the wall to the board. However, in this case, since the distance from the wall to the board (surface member) is increased, there is a problem in that the volume of the room partitioned by the reinforcing wall is reduced.

  The present invention has been made in view of the above-described problems, and its purpose is to provide a wall reinforcement structure for improving the overall sound insulation performance by dispersing the resonant transmission frequency even when the distance from the existing wall to the surface member is shortened. To provide a reinforcing wall and a wall reinforcing method.

  A wall reinforcing structure that solves the above problem is a wall reinforcing structure provided outside an existing wall, and is a wall base member that is arranged in parallel with the existing wall at a distance from the existing wall, and the wall base A porous sound-absorbing member disposed between the members and a surface member connecting the outer surface of the wall base member, and having a thickness greater than the distance from the existing wall to the contact surface between the wall base member and the surface member The quality sound absorbing member is compressed and packed between the existing wall and the surface member.

  According to this configuration, since the porous sound absorbing member is packed between the wall base members while being compressed by the surface member, the resonance transmission frequency is dispersed even if the distance from the existing wall to the surface member is shortened. The overall sound insulation performance can be improved.

  About the said wall reinforcement structure, it is preferable that the surface member is formed by bonding together a plurality of plate-like members having different thicknesses in the thickness direction. According to this configuration, since the resonance frequencies of the respective plate-like members are different, the resonance frequencies can be dispersed by bonding them together, and the sound insulation performance can be further improved.

  About the said wall reinforcement structure, it is preferable that the porous sound-absorbing member uses the several porous sound-absorbing member from which density differs. According to this configuration, it is expected that the resonance frequency is further dispersed by using a plurality of porous sound absorbing members having different densities.

  The reinforcing wall that solves the above problem is a reinforcing wall that includes an existing wall and a wall reinforcing structure provided outside the existing wall, the wall reinforcing structure being separated from the existing wall, and A wall base member disposed in parallel with the existing wall; a porous sound absorbing member disposed between the wall base members; and a surface member that connects an outer surface of the wall base member; The gist is that a porous sound-absorbing member thicker than the distance between the wall base member and the surface member is compressed and packed between the existing wall and the surface member.

  According to this configuration, since the porous sound absorbing member is packed between the wall base members while being compressed by the surface member, the resonance transmission frequency is dispersed even if the distance from the existing wall to the surface member is shortened. The overall sound insulation performance can be improved.

  A wall reinforcing method for solving the above-mentioned problem is a method of providing a wall outside an existing wall, wherein a plurality of wall base members are arranged in parallel to the existing wall, spaced apart from the existing wall, A porous sound absorbing member thicker than the distance from the existing wall to the outer surface of the wall base member is disposed between the wall base members, and the surface member covering the surface of the wall base member and the porous sound absorbing member is fixed. It is a summary.

  According to this configuration, since the porous sound absorbing member is packed between the wall base members while being compressed by the surface member, the resonance transmission frequency is dispersed even if the distance from the existing wall to the surface member is shortened. The overall sound insulation performance can be improved.

  According to the present invention, even if the distance from the existing wall to the surface member is shortened, the resonance transmission frequency can be dispersed and the overall sound insulation performance can be improved.

The plane sectional view explaining the composition of the reinforcement wall of an embodiment. It is explanatory drawing explaining the dimension of the reinforcement wall of embodiment, (a) shows the dimension relationship between the distance of an existing wall and a wall base material, and a porous sound-absorbing member, (b) shows the dimension of a surface member. . The figure which shows the measured value of the sound transmission loss in the reinforcement wall of embodiment, and the wall of a comparative example. Sectional drawing explaining the structure of the reinforcement wall of the example of a change.

Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS.
As shown in FIG. 1, the reinforcing wall 10 includes an existing wall 11 such as a frame wall and an outer wall reinforcing structure 20. The wall reinforcing structure 20 includes a plurality of wall base members 21, a porous sound absorbing member 25, and a surface member 30.

  The wall base member 21 is made of a substantially C-shaped lightweight steel material (for example, lightweight steel), and is disposed at a predetermined interval with respect to the existing wall 11. Specifically, the wall base member 21 is arranged in parallel with the existing wall 11 so that the surface (outer surface) opposite to the existing wall 11 is flush with the opening side facing the existing wall 11. Has been.

  Further, as shown in FIG. 2A, the wall base member 21 is arranged such that the distance from the existing wall 11 to the outer surface is a distance L1. In this embodiment, the distance L1 = 47 mm.

As shown in FIG. 1, a porous sound absorbing member 25 made of, for example, a fibrous member is compressed and packed between the wall base members 21.
As shown in FIG. 2A, the porous sound absorbing member 25 having a thickness tw larger than the distance L1 is used. In the present embodiment, glass wool having a thickness of tw = 50 mm at 24 kg / m ³ is used as the porous sound absorbing member 25.

  As shown in FIG. 2B, the surface member 30 is disposed on the outer surfaces of the wall base member 21 and the porous sound absorbing member 25. In the present embodiment, the surface member 30 has a width that can be spanned over at least two wall base members 21, and is fixed to the wall base member 21. The surface member 30 has a configuration in which a plurality of plate-like members are bonded to each other in the thickness direction. In this embodiment, two plaster boards 31 and 32 having different thicknesses are bonded together. In the present embodiment, the thicknesses t1 and t2 of the gypsum boards 31 and 32 are 12.5 mm and 9.5 mm, respectively.

Next, the construction method of this reinforcement wall 10 is demonstrated using FIG.
First, as shown in FIG. 2A, the wall base member 21 is disposed on the existing wall 11. Specifically, the plurality of wall foundation members 21 are arranged in a row so that the outer surface of the wall foundation member 21 is flush and the distance from the existing wall 11 to the outer surface of the wall foundation member 21 is the distance L1. To do.

  Next, the porous sound absorbing member 25 is disposed between the wall base members 21. In this case, the outer surface of the porous sound absorbing member 25 protrudes outward from the same position of the outer surface (contact surface) of the wall base member 21. Therefore, as shown in FIG. 2B, a surface member 30 is disposed on the outer surface of the wall base member 21, and the surface member 30 is fixed to the wall base member 21 with screws or the like. In this case, the surface member 30 presses the porous sound absorbing member 25 toward the existing wall 11 side. The porous sound absorbing member 25 is compressed and packed between the existing wall 11 and the surface member 30. Thus, the reinforcing wall 10 of the present embodiment is formed.

Next, the measured value of the sound transmission loss in the reinforcing wall 10 of the present embodiment will be described with reference to FIG. In FIG. 3, the horizontal axis is the 1/3 octave band center frequency (Hz), and the vertical axis is the sound transmission loss (dB). In FIG. 3, “◯” is the sound transmission loss in the existing wall 11 before construction. In contrast, the measurement results of the two specifications are compared. The sound transmission loss (indicated by “Δ”) in the specification A is obtained by pasting a gypsum board with a damping sheet (trade name: SP-4D, manufactured by Toho Zinc Co., Ltd.) on the existing wall 11. In addition, the sound transmission loss (indicated by “□”) in the specification B is the reinforcing wall 10 of the present embodiment (the wall base member is a 45 mm thick stud (lightweight steel), the air layer is 47 mm, and the porous sound absorbing member is 24 kg. Glass wool with a thickness of 50 mm at / m ³ , and the surface member is a laminate of two gypsum boards of 12.5 mm thickness and 9.5 mm thickness). In the specification B (reinforcing wall 10 of this embodiment) in FIG. 3, the sound transmission loss does not decrease at the resonance transmission frequency (about 125 Hz), and more than in the case of the existing wall (◯) and the additional wall (Δ). Sound insulation performance is improved.

According to this embodiment, the following effects can be obtained.
(1) In this embodiment, the reinforcing wall 10 is provided with a wall reinforcing structure 20 outside the existing wall 11. The wall reinforcing structure 20 includes a plurality of wall base members 21 arranged in parallel to the existing wall 11 and a porous sound absorbing member 25 having a thickness larger than the distance L1 from the existing wall 11 to the outer surface of the wall base member 21. And a surface member 30 arranged so as to press the outer surface of the porous sound absorbing member 25. Thereby, the porous sound absorbing member 25 is packed between the wall base members 21 in a state compressed by the surface member 30. Therefore, even if the distance L1 from the existing wall 11 to the surface member 30 is set to about 50 mm, the sound transmission performance at the resonance transmission frequency is avoided and the sound insulation performance is improved as compared with the existing wall and the additional wall. Can be made. For this reason, even if it improves sound insulation performance, the distance from the existing wall 11 to the surface member 30 can be shortened, and the thickness of the wall reinforcement structure 20 can be made thin. As a result, a large room volume can be secured.

  (2) As the reinforcing wall 10 of the present embodiment, a surface member 30 in which two gypsum boards 31 and 32 having different thicknesses are bonded together is used. For this reason, since the resonant frequency of each gypsum board 31 and 32 differs, the resonant frequency can be disperse | distributed by bonding each, and the sound-insulation performance can be improved further.

Moreover, you may change the said embodiment as follows.
In the reinforcing wall 10 of the above embodiment, the porous sound absorbing member 25 is compressed by the surface member 30 using the porous sound absorbing member 25 that is 3 mm thicker than the distance L1 from the existing wall 11 to the outer surface of the wall base member 21. And packed. The thickness of the porous sound absorbing member 25 is not limited to this, and may be any thickness that can be packed while being compressed by the surface member 30 when the surface member 30 is fixed to the wall base member 21.

In the reinforcing wall 10 of the above embodiment, one type of porous sound absorbing member 25 is used. However, the present invention is not limited to this, and a plurality of types of porous sound absorbing members may be used. For example, as shown in FIG. 4, two porous sound absorbing members 25 a and 25 b having different densities are alternately arranged between the wall base members 21. Specifically, glass wool having a thickness of tw = 50 mm at 24 kg / m ³ is used as the porous sound absorbing member 25a, and glass wool having a thickness of tw = 50 mm at 48 kg / m ³ is used as the porous sound absorbing member 25b. And the wall base member 21 is arrange | positioned with the predetermined space | interval with respect to the existing wall 11, every other porous sound absorption member 25a is arrange | positioned between the wall base members 21, and between the porous sound absorption members 25a. The porous sound absorbing member 25b is disposed. In this case, as shown in FIG. 2A, the outer surface of the porous sound absorbing member 25 protrudes outward from the outer surface of the wall base member 21. And the surface member 30 is arrange | positioned and fixed to the outer side of the wall base member 21 similarly to the said embodiment. In this case, since the surface member 30 presses the porous sound absorbing members 25 a and 25 b, the porous sound absorbing members 25 a and 25 b are compressed and packed between the existing wall 11 and the surface member 30. Thereby, it can be expected that the resonance frequency is further dispersed by using the plurality of porous sound absorbing members 25a and 25b having different densities.

Moreover, in the said embodiment, although glass wool was used as the porous sound absorption member 25, the porous sound absorption member 25 is not restricted to this, For example, rock wool etc. may be sufficient.
Furthermore, in the above embodiment, the porous sound absorbing member 25 is disposed between the wall base members 21, but the porous sound absorbing member 25 is also disposed between the wall base member 21 and the existing wall 11. You may make it do.

In the reinforcing wall 10 of the above-described embodiment, the wall base member 21 made of a substantially C-shaped lightweight steel material is used. However, the wall base member 21 is not limited to this, and is a light steel material of another shape. Alternatively, other materials such as wood may be used.
-In the reinforcing wall 10 of the said embodiment, the surface member 30 which bonded two gypsum boards 31 and 32 from which thickness differs was used. The configuration of the surface member 30 is not limited to this. For example, it is also possible to use a gypsum board with a vibration damping sheet in which two sheets of a 12.5 mm thick gypsum board and a 4 mm thick asphalt-based vibration damping sound insulation board are bonded together. Further, the thickness of the board to be bonded is not limited to these.

L1, distance, t1, t2, tw, thickness, 10, reinforcing wall, 11 ... existing wall, 20 ... wall reinforcing structure, 21 ... wall foundation member, 25, 25a, 25b ... porous sound absorbing member, 30 ... surface member , 31, 32 ... gypsum board.

Claims (5)

A wall reinforcement structure provided outside an existing wall,
A wall base member arranged in parallel with the existing wall, apart from the existing wall;
A porous sound absorbing member disposed between the wall base members;
A surface member for connecting the outer surface of the wall base member,
A wall reinforcing structure characterized in that a porous sound absorbing member thicker than a distance from the existing wall to the contact surface between the wall base member and the surface member is compressed and packed between the existing wall and the surface member.   The wall reinforcing structure according to claim 1, wherein the surface member is formed by bonding a plurality of plate-like members having different thicknesses in the thickness direction.   The wall reinforcing structure according to claim 1 or 2, wherein the porous sound absorbing member uses a plurality of porous sound absorbing members having different densities. A reinforcing wall comprising an existing wall and a wall reinforcing structure provided outside the existing wall,
The wall reinforcing structure is
A wall base member arranged in parallel with the existing wall, apart from the existing wall;
A porous sound absorbing member disposed between the wall base members;
A surface member for connecting the outer surface of the wall base member,
A reinforcing wall comprising a porous sound-absorbing member that is thicker than a distance from the existing wall to the contact surface between the wall base member and the surface member and compressed between the existing wall and the surface member. A wall reinforcement method for providing a wall outside an existing wall,
Separated from the existing wall, a plurality of wall base members are arranged in parallel to the existing wall,
A porous sound absorbing member that is thicker than the distance from the existing wall to the outer surface of the wall base member is disposed between the wall base members,
A wall reinforcing method comprising fixing a surface member covering surfaces of the wall base member and the porous sound absorbing member.

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