JPH11159043A - Floor impact noise reducing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a floor impact noise reducing structure capable of effectively reducing the propagation of floor impact noise generated upstairs to downstairs, especially floor impact noise due to a so-called drum phenomenon. SOLUTION: This structure reduces to propagation of impact noise generated on an upstairs floor 4 to downstairs in a multilayer building. In this case, a wall with an inside space is provided on an upstairs (a wall 1) and/or a downstairs (a wall 2) to communicate inside spaces 10, 20 between the walls 1, 2 with space (a ceiling cavity space) between the floor 4 and a downstairs ceiling 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floor impact sound reducing structure in a multi-storey building, and more particularly, to a floor impact sound reducing structure capable of reducing the propagation of floor impact sound generated on an upper floor to a lower floor. About.

[0002]

2. Description of the Related Art In recent years, with the increase of multi-storey detached houses and a high density of living environment, the necessity of countermeasures against floor impact noise in a multi-storey building has increased. Conventionally, as a method of reducing floor impact noise, a method of laying a sheet-like sound insulating material on a material of an upper floor, and a method of using a hanging tool (suspension tree) with an impact buffer material on an upper floor structure. Etc. are known.

However, in recent years, as a rationalized structure, the advanced floor construction method has become widespread not only in the unit structure and the frame 2 × 4 method but also in the conventional framing method. In many cases, spatial continuity between the space between the floor on the upper floor and the ceiling on the lower floor and other spaces such as indoors is cut off. Along with this, the air trapped in the space between the upper floor and the lower floor ceiling (hereinafter referred to as the ceiling space) acts like an air spring and directly lowers the vibration of the upper floor. The problem of floor impact sound propagation due to the so-called taiko phenomenon, which is transmitted to the ceiling surface of a building, has become apparent. Further, it is difficult to effectively reduce the floor impact sound according to the above-described related art.

Accordingly, it is an object of the present invention to provide a floor impact sound reducing structure capable of effectively reducing the propagation of floor impact noise generated on the upper floor to the downstairs, particularly the floor impact sound caused by the so-called drum phenomenon. Is to provide.

[0005]

According to the first aspect of the present invention,
A floor impact sound reducing structure for reducing the propagation of impact sound of an upper floor to a lower floor in a multi-storey building, wherein a wall body having an internal space is provided on the upper floor and / or the lower floor. ,
The object described above has been achieved by providing a floor impact sound reducing structure characterized in that the internal space of the wall and the space between the floor and the ceiling of the lower floor are communicated with each other. It is.

According to a second aspect of the present invention, a plurality of floor panels are laid on a horizontal member to form the floor of the upper floor, and the floor panel has an end located below the wall of the upper floor. A notch extending between the upper and lower surfaces of the floor panel, and the notch forming a communication passage communicating the internal space of the wall body and the space between the floor and the ceiling of the lower floor. The above object has been achieved by providing a floor impact sound reducing structure according to claim 1.

According to a third aspect of the present invention, in the above-mentioned wall and / or
The sound-absorbing material and / or the sound-insulating material are disposed in a space between the floor and the ceiling on the lower floor, and the floor impact sound reducing structure according to claim 1 or 2, wherein: The above-mentioned object has been achieved by providing.

According to a fourth aspect of the present invention, a wall having an internal space is provided at least on the lower floor, and a width of an entrance of the wall into the internal space is formed smaller than a width of the inside of the wall. The above object has been achieved by providing a floor impact sound reducing structure according to any one of claims 1 to 3.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the floor impact sound reducing structure of the present invention will be described below with reference to the drawings. Here, FIG. 1 is a schematic sectional view showing one embodiment of the floor impact sound reducing structure of the present invention, FIG. 2 is a plan view showing an end of the floor panel in FIG. 1, and FIG. It is a perspective view which shows the notch formed in the floor panel.

The floor impact noise reduction structure of this embodiment is a floor impact noise reduction structure for reducing the transmission of the impact noise of the upper floor 4 to the lower floor 5 in a multi-storey building. The upper floor (wall body 1) and the lower floor (wall body 2)
And a space (ceiling space) 3 between the floor 4 and the ceiling 7 of the lower floor 5 is communicated with each of the internal spaces 10 and 20 of the wall bodies 1 and 2.

Hereinafter, the floor impact sound reducing structure of the present embodiment will be described in more detail. The floor impact noise reduction structure of the present embodiment is a floor impact noise reduction structure in a two-story wooden house, and is a structure of a building that reduces the propagation of impact noise generated by an impact on the second floor 4a to the first floor 5. A wall 1 and a wall 2 are provided as partition walls having internal spaces 10 and 20 on the second floor and the first floor.

On the floor 4, under the wall 1,
A communication passage 42 is formed to communicate the internal space 10 with the ceiling space 3 which is a space under the floor 4. More specifically, the floor 4 is configured by laying a plurality of floor panels 41 on a horizontal member 6 and further laying a base material 43 and a floor member 44 thereon. The communication path 42 is formed by providing a notch 45 extending between the upper and lower surfaces of the floor panel 41 at an end of the floor 41 located below the wall 1. The floor panel 41
Is obtained by cutting a conventionally known floor-forming panel, and there is no particular limitation on the material and the like of the panel.

As shown in FIG. 3, the notch 45 is formed with a tapered surface 45a.
The opening area of the panel lower surface 41b is larger than that of the upper surface 41a, and as shown in FIG. A communication path 42 that opens into the ceiling space 3 is formed avoiding the material 6. The vicinity of the upper surface 41a of the floor panel 41 in the notch portion 45 is a vertical surface 4
5b, the tapered surface 45a and the upper surface 41
The distance between a and a is not too thin. Accordingly, it is possible to prevent the floor panel 41 from being damaged at the time of laying the panel, and to secure necessary strength also in a portion where the cutout portion is provided.

As shown in FIG. 2, the floor 4 in the present structure has a floor panel 41 having a size of 910 mm × 1820 mm.
The floor panel 41 having an end below the wall body 1 having the internal space 10 has a length of 910 m at any of the vertical and horizontal ends of the floor panel 41.
The notch 45 is formed at two ratios m.
FIG. 2 shows a floor panel 41b disposed at a corner of a room. Walls each having an internal space are disposed in the horizontal direction and the vertical direction in FIG.

A notch 45 formed at one end of the floor panel 41b in the longitudinal direction forms a communication path 42 for communicating the inside of the wall 1 arranged in the horizontal direction of FIG. And a communication passage for communicating the inside of the wall 1 ′ arranged in the vertical direction of FIG. 2 and the above-mentioned ceiling space 3 by a cutout 45 formed at one end in the width direction of the floor panel 41. 4
2 (only one is shown) are formed. In FIG. 2, the wall body 1 and the wall body 1 'are shown by showing the wall members 11 and 11' constituting the wall bodies 1 and 11 'by dotted lines.

The upper floor 4 and the lower ceiling 7 in the present structure.
As shown in FIG. 1, the space (ceiling space) 3 between
Furthermore, it communicates with the internal space 20 of the wall body 2 on the lower floor.
The wall 2 has a space between the wall members 21 constituting the wall 2, and the upper end of the wall 2 is connected to the ceiling 7 on the first floor. As shown in FIG. 1, the ceiling 7 includes a ceiling base material 71 and a plaster board 72, and a sound absorbing material 73 is laid on the ceiling base material 71. The sound absorbing material 73 is a sheet-shaped sound absorbing material, and is preferably made of glass wool, rock wool, or various plastic foam materials. In addition, the wall 1
A similar sound absorbing material (not shown) is also adhered to the inner surface of the wall 2.

The thickness T of the space in the wall 1 (see FIG. 1)
Is often determined by the diameter of the pillar, 90-150m
m, but is often between 105 and 120 mm.
The same applies to the thickness of the space inside the wall 2.

According to the floor impact sound reduction structure of the present embodiment, it is possible to reduce the propagation of the floor impact sound on the upper floor to the lower floor, particularly the propagation due to the so-called drum phenomenon. This is because, when the volume of the closed space interposed between the upper floor 4 and the lower ceiling 7 is increased, pV = constant (p is pressure, V is volume), and p · ΔV +
This is because the pressure change due to the floor impact noise is reduced according to Boyle's law of V · Δp = 0 (Δp is a pressure change, ΔV is a volume change). Here, the phenomenon that the pressure change (Δp) becomes small appears remarkably in a low frequency band.
This is particularly effective for soundproofing. Note that the soundproofing performance between the upper and lower floors slightly decreases in a frequency band equal to or higher than the midrange, but this can be reduced by installing a sound absorbing material or the like.

Further, according to the floor impact sound reducing structure of the present embodiment, since the sound absorbing material is provided on the inner surfaces of the walls 1 and 2 to which the ceiling space 3 communicates, the upper part of the walls 1 and 2 is provided. The floor impact sound of the floor is absorbed by the sound absorbing material, and the propagation of the floor impact sound can be further reduced. In addition, since the sound absorbing material is laid on the ceiling 7 on the lower floor in addition to the inside of the walls 1 and 2, floor impact noise can be reduced more effectively.

If a sound insulating material is provided together with such a sound absorbing material in the walls 1 and 2 and / or the ceiling space 3, the propagation of floor impact sound can be reduced more effectively. It is preferred. In addition, it is possible to improve the sound insulation of the middle range or higher between upper and lower floors and / or between adjacent rooms. As the sound insulating material, a double-sticking of a plaster board, a sound insulating sheet containing metal powder, or the like can be preferably used.
A sheet-like material is preferable because of its excellent workability and the like. In this way, by arranging the sound absorbing material and / or the sound insulating material in the wall and / or in the ceiling pocket, the sound insulation performance between the upper and lower floors and / or between the adjacent rooms in the frequency band equal to or higher than the middle frequency range. Can be suppressed. Thereby, it is possible to effectively reduce the floor impact sound.

The present invention is not limited to the above-described embodiment, and can be appropriately modified without departing from the spirit of the present invention. For example, in the floor impact sound reducing structure in the above embodiment, the wall body having the internal space is provided on the upper floor (the second floor) and the lower floor (the first floor), and the internal space of these two wall bodies is the same as the ceiling pocket space 3. The floor impact sound reducing structure of the present invention is formed by connecting the ceiling pocket 3 to one of the upper floor and the lower floor (preferably the upper floor). It may be. Further, the upper floor and the lower floor may be further upper floors like the third floor and the second floor, or may be the first floor and the basement floor.

The wall which connects the ceiling pocket 3 may be a partition wall or an outer peripheral wall. Further, as in the above embodiment, the ceiling pocket 3 may be communicated with both the partition wall and the outer peripheral wall.

Further, the building to which the floor impact sound reducing structure of the present invention is applied is not limited to a building by the panel method, but a space is formed between the floor on the upper floor and the ceiling on the lower floor. The building may be made by any construction method as long as the building can have a wall body having the same. In addition, the method of communicating the space between the floor on the upper floor and the ceiling on the lower floor with the internal space of the wall body can use an appropriate method as long as communication between both spaces is possible, for example, Instead of forming the communication path 42 by providing a cutout at the end of the floor panel 41, a communication hole communicating between the two spaces may be formed at the end of the floor panel or the floor. Further, a structural plywood is laid on a joist to form an upper floor, and a gap is provided between adjacent structural plywoods under a wall provided on the upper floor, or under the wall. A cut-out portion for forming a communication passage may be provided at an end of the abutted structural plywood to connect the internal space of the wall and the ceiling space on the lower floor.

In addition, the sound absorbing material and the sound insulating material may be provided together in the same place,
Alternatively, only one of them may be provided at all locations.
In addition, the sound absorbing material and the sound insulating material are preferably provided both in the wall and between the upper floor and the lower ceiling, but may be provided only in the wall.

Further, as shown in FIG. 9, when the entrance of the wall 2 communicating with the ceiling space 3 is narrowed down narrowly, a Helmholtz type sound absorbing device is formed, and the floor impact sound can be more effectively reduced. Can be. In the structure shown in FIG. 9, the width W1 of the entrance to the internal space 20 of the wall 2 is adjusted by attaching a dedicated member 8 to the upper end of a pair of wall materials 21 constituting the lower wall 2. It is formed narrower than the width W2 inside the wall. In addition, instead of using the dedicated member 8 as described above, the width of the entrance of the internal space 20 is reduced by projecting the constituent members of the ceiling 7 to the upper part of the internal space 20 of the wall 2. It may be formed narrower than the internal width.

[0026]

EXAMPLES Hereinafter, the effectiveness of the present invention will be specifically illustrated using examples, and the present invention will be further described.

<Embodiment> As shown in FIGS. 4 and 5, the floor 4 of a room on the second floor surrounded by a partition wall on two surfaces and an inner surface (inner wall) on the other two surfaces as shown in FIG. 910mm × 1
820 mm, 35 mm thick floor panels 41a, 41b,
A total of eight sheets 41c and 41c 'were laid in two vertical rows, and a 12 mm thick wood fiber board buffer board and a 12 mm thick wooden flooring material 44 were laid on these floor panels as a base material. . Here, FIG. 5 is a sectional view taken along line AA of FIG.

The above-mentioned floor panel has a length of 150 m along the edge.
m, a cutout 45 having a depth of 60 mm is formed at two ratios of 910 mm, the floor panel 41 a is formed with a cutout 45 only at one end in the longitudinal direction, and the floor panels 41 b and 41 c are formed in a longitudinal direction. A notch 45 is formed at one end in the width direction and one end in the width direction. The floor panel 41c 'is a panel arranged at the entrance of the room, and the entrance of the room is provided at a portion where the notch is not provided.

Each notch 45 in these floor panels
Is partially covered by the buffer board 43 and the floor member 44, and is configured such that only a portion of the notch 45 having a depth of 20 mm opens upward. The opening of the cutout 45 in each floor panel opens into the partition wall at the upper edge and the left edge of the floor 4 in FIG. 4, and the outer peripheral wall at the right edge and the lower edge in FIG. In the floor impact sound reduction structure of the present embodiment, the ceiling pocket 3 communicates with both the upper floor partition wall and the outer peripheral wall.

In the structure of the present embodiment, the ceiling space 3 is also communicated with the inside of the partition wall and the outer peripheral wall of the lower floor as shown in FIG. The ceiling 7 on the first floor is S
A 12 mm plaster board 72 was provided on the S ceiling, and glass wool 73 was laid on the plaster board 72 as a sound absorbing material.

<Comparative Example> FIG. 6 shows a building structure of a comparative example, in which the floor panels 41a, 41b, 41c and 41c 'having the cutouts in the above embodiment are replaced by conventional construction. Using floor panels without notches,
And the space between the floor 4 and the first floor ceiling 7 (ceiling space)
Except that the space between the ceiling wall 3 and the lower floor is closed between the partition wall and the outer peripheral wall so that the ceiling space 3 does not communicate with the space in any of the walls on the upper floor and the lower floor. It is configured in the same way as described above.

<Evaluation> The floor of the second floor in each of Examples and Comparative Examples was replaced with a predetermined floor impact sound generator specified by JIS.
That is, the impact sound is measured with a bang machine as a heavy floor impact source and a tapping machine as a lightweight floor impact source, and the impact sound is measured downstairs to determine the degree of propagation of the heavy floor impact sound and the lightweight floor impact sound to the first floor. Examined. The results are shown in FIGS. FIG. 7 is a graph showing the results measured for heavy floor impact sounds, and FIG. 8 is a graph showing the results measured for lightweight floor impact sounds.

As shown in these results, according to the floor impact sound reducing structure of the embodiment, the floor impact sound is reduced for both the heavy floor impact sound and the light floor impact sound with respect to the structure of the comparative example. It was possible to reduce by 2-3 dB. No decrease in the sound insulation between the adjacent rooms was observed. Although not described in detail,
When the width of the notch 45 in this embodiment was changed from 150 mm to 250 mm in the same manner, the contact surface between the floor surface and a structural material such as a beam was reduced, and the effect of reducing the floor impact sound was further improved. I was able to.

As described above, the floor impact sound reducing structure of the present invention
In spite of the simple structure, the floor impact noise can be efficiently reduced. For this reason, there is a prospect that a specification of a floor impact sound level of about L-65, which had to be heavy equipment in a wooden house, can be realized with light equipment.

[0035]

As is apparent from the above description, according to the floor impact sound reducing structure of the present invention, the propagation of the floor impact sound to the lower floor of the upper floor, especially the propagation of the floor impact sound due to the so-called taiko phenomenon. It can be reduced effectively.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an embodiment of a floor impact sound reducing structure of the present invention.

FIG. 2 is a plan view showing an end of the floor panel in FIG. 1;

FIG. 3 is a perspective view showing a cutout portion formed in a floor panel.

FIG. 4 is a plan view showing a bird's-eye view of the floor on the second floor in the embodiment of the present invention.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a cross-sectional view of a comparative example by conventional construction.

FIG. 7 is a graph showing evaluation results for heavy floor impact sounds.

FIG. 8 is a graph showing evaluation results of lightweight floor impact sounds.

FIG. 9 is a schematic view showing a main part according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper-floor wall 2 Lower-floor wall 3 Space between the floor and the lower-floor ceiling (ceiling space) 4 Upper-floor floor 41 Floor panel 42 Communication passage 43 Base material 44 Floor material 45 Notch 5 Lower floor 6 Horizontal material 7 Lower floor ceiling 73 Sound absorbing material

Claims (4)

[Claims] 1. A floor impact sound reducing structure for reducing an impact sound of an upper floor from propagating to a lower floor in a multi-storey building, wherein the wall body having an internal space is provided on the upper floor and / or the lower floor. A floor impact sound reducing structure provided on the lower floor, wherein an internal space of the wall body and a space between the floor and a ceiling of the lower floor communicate with each other. 2. A floor of the upper floor is constructed by laying a plurality of floor panels on a horizontal member, and an end of the floor panel located below the wall of the upper floor is provided with an upper part of the floor panel. A notch extending between the lower surfaces is provided, and the notch forms a communication passage that communicates the internal space of the wall with the space between the floor and the ceiling of the lower floor. The floor impact sound reducing structure according to claim 1. 3. A sound absorbing material and / or a sound insulating material is disposed in the wall and / or in the space between the floor and the ceiling of the lower floor. Item 3. The floor impact sound reducing structure according to Item 2. 4. A wall body having an internal space is provided at least on the lower floor, and a width of an entrance of the wall body into the internal space is formed smaller than a width of the inside of the wall body. Item 4. The floor impact sound reducing structure according to any one of Items 1 to 3.