JPH0643750B2 - Soundproof floor structure and cushioning material for underfloor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention provides a cushioning material made of glass wool mat or the like wholly or partially on a floor substrate made of concrete floor slab or the like. More specifically, the present invention relates to a dry floating floor structure for performing floor finishing by using joists alone or through large pulls and joists, and more particularly, to a soundproof floor structure and a cushioning material for underfloor for reducing impact force and impact sound of the floor.

(Prior Art) The above floating floor structure is used to reduce the impact force of the floor transmitted to the floor base through joists, and to make it difficult for the impact sound of the upper room and the walking sound to be transmitted to the downstairs. However, when an impact force is applied right above the joists, the joists are bent, the cushioning material is compressed, and the thickness is locally reduced.

Therefore, in the conventional dry floating floor structure, as shown in FIG. 9, a load distribution plate b made of plywood or the like having a larger area than the lower surface of the joist a is interposed between the joist a and the cushioning material c. The load distribution plate b disperses the load and impact force to prevent a local decrease in the thickness of the cushioning material c.

(Problems to be solved by the invention) However, when the load distribution plate b is interposed in this way, the sinking of the floor surface is reduced and the floor surface is stabilized, while the cushioning material c is used as the load distribution plate b and the concrete floor. The air in the cushioning material c is trapped by the slab d. Therefore, when the cushioning material c is compressed, the air inside the cushioning material c loses its escape area, and the cushioning material c also has an elastic force due to the air pressure in addition to the normal elastic force. That is, there is a problem that the repulsive force of the cushioning material c becomes large, the cushioning material c is not smoothly compressed and deformed when an impact force is applied, and the impact force of the floor is transmitted almost as it is.

Further, since the load distribution plate b covers the upper surface of the cushioning material c and reverberates a slippery sound such as pattering on the floor surface, the cushioning material c has a problem of reducing the absorbing power of the lightweight floor impact sound. There was also.

(Object of the Invention) In view of the above, the present invention can secure the sound absorbing power while absorbing the impact force generated on the floor surface while maintaining the stability of the floor surface obtained by disposing the load distribution plate. An object is to provide a soundproof floor structure and an underfloor cushioning material.

(Means for Solving the Problems) In view of the above, the inventions of claims (1) and (2) provide an escape area for air inside the cushioning material above and to the side thereof when an impact force is transmitted to the cushioning material. In addition to securing the sound, the impact sound on the floor, the walking sound, and the like pass through the load distribution plate and reach the sound absorbing cushioning material.

Specifically, the solution means taken by the invention of claim (1) is a soundproof floor structure, on a floor base consisting of concrete floor slabs,
A plurality of rectangular sound-absorbing cushioning materials made of glass wool mat or the like are arranged with a space between the side surfaces, and a load distribution plate made of a perforated plate is arranged on the plurality of cushioning materials. A floor support material such as joists is placed on the load distribution plate directly or via an elastic body, and floor finishing is performed on the floor support material.

Further, the solution means taken by the invention of claim (2) is intended for an underfloor cushioning material arranged on a floor base consisting of a concrete floor slab or the like, and is substantially the same as the cushioning material on the upper surface of the sound absorbing cushioning material. A rectangular plate-like body formed by laminating and integrating load-balancing plates consisting of perforated plates of a small size, and an elastic body integrally fixed to the upper surface of the load-balancing plate of the plate-like body. And a joist placement section.

(Operation) According to the configurations of claims (1) and (2), the impact force generated on the floor surface is transmitted to the load distribution plate through the joists, and the cushioning material is compressed between the load distribution plate and the floor base. In this case, the air inside the impact material escapes upward through the holes of the load distribution plate and escapes laterally from the side surface of the cushioning material, so that a momentary increase in the air pressure in the cushioning material is prevented and the impact is damped. Since the material is smoothly compressed and deformed, the original cushioning property can be maintained.
Further, the impact sound and the walking sound generated on the floor surface are transmitted to and absorbed by the cushioning material through the holes of the load distribution plate.

(Example) Hereinafter, the Example of this invention is described based on drawing.

FIGS. 1, 2 and 6 show a soundproof floor structure according to the invention of claim (1), which is a concrete floor slab floor base 1
A plurality of cushioning materials 2 having a sound absorbing property, which are cut into a rectangular shape, are laid on the upper side of the above, with a space portion between the side surfaces. As the cushioning material 2, a fiber mat such as a glass wool mat, a rock wool mat, or a synthetic fiber mat, or
An open-cell foam synthetic resin mat is used. Specifically, it is a glass wool mat with a density of 64 kg / m ³ and a thickness of 2
Those having a thickness of 5 to 50 mm are preferable because they are excellent in vibration absorption and sound absorption of the floor surface.

A load distribution plate 3 composed of a perforated plate having substantially the same size as the shock absorbing material 2 is arranged on the shock absorbing material 2. As the load distributing plate 3, a plywood, a hard board, a plywood resin plate, or the like is used.
Specifically, a plywood sheet having a thickness of 2.5 to 5.0 mm is preferable because it can evenly disperse the load and moderately flexes to soften the feeling of walking. The range in which the load distribution plate 3 is arranged is preferably twice or more the width of the lower surface of the joist 5 described later in order to stabilize the floor surface, and in the length direction, the entire length of the lower surface of the joist 5 is provided. May be provided, or an appropriate interval may be provided. Further, as the holes provided in the load distribution plate 3, the through holes 31 having a diameter of 5 to 20 mm are provided as the opening holes 5 to 40.
%, Specifically, through holes having a diameter of 15 mm are uniformly provided at a pitch of 30 mm, and the aperture ratio is 19.6.
% While maintaining the strength of the load distribution plate 3,
Sound absorption and air circulation in the through holes 31 can be performed smoothly, which is preferable.

Although not essential, it is preferable to dispose the elastic body 4 on the load distribution plate 3. As the elastic body 4, a plywood fiber felt, a rubber mat, a foamed sheet or the like is appropriately used,
Specifically, since the felt made of plywood fiber having a thickness of 5 to 30 mm and a specific gravity of 0.02 to 0.1 has air permeability, the through hole 31
It is preferable that friction with the floor support material such as joists and collision noise can be prevented without obstructing the air flow in the above.

When the elastic body 4 is not breathable, the elastic body 4 is provided with a size not more than 1/2 of the load distribution plate 3 so as not to obstruct the outflow of air from the through hole 31 of the load distribution plate 3.

A joist 5, which is a floor support material, is placed on the load distribution plate 3 or on the elastic body 4 when the elastic body 4 is arranged, and a floor finishing material is placed on the joist 5. 6 are laid. The material and dimensions of the joist 5 and the floor finishing material 6 are not particularly problematic, but the joist 5 has a thickness of 20 mm and a width of 50 mm, and the floor finishing material 6 is a plywood or particle board having a thickness of 12 mm for discarding. 61 and an appropriate floor material 62 such as a wooden floor or carpet is applied (see FIG. 5).

Of the floor finishing material 6, the plywood 61 for discarding may be omitted depending on the floor material.

FIG. 3 shows an underfloor cushioning material A according to the invention of claim (2), which is a cushioning material 2A made of the same material and having the same thickness as the above-mentioned sound absorbing cushioning material 2 and cut into a rectangular shape. The load distribution plate 3 having the same material and thickness as the load distribution plate 3 and the same through hole 31 as that of the load distribution plate 3 and having substantially the same size as that of the cushioning material 2A.
A is laminated and integrated.

A strip-shaped joist mounting portion 8A is provided substantially at the center in the width direction on the upper surface of the load distribution plate 3A, and the joist mounting portion 8A is made of the same material and has the same thickness as the elastic body 4 described above. Are integrally formed on the load distribution plate 3A.

FIG. 4 shows a modified example of the underfloor cushioning material A, which is different from the above-mentioned embodiment in that the through holes 31 of the load distribution plate 3A are provided in the shape of slits to facilitate sound absorption and air circulation of the through holes 31. The joist rests 8A are provided on one side in the width direction on the upper surface of the load distribution plate 3A, and the two floor base cushioning materials A are provided with the joist rests 8A inside.
When rotated by 0 ° and overlapped, both joist placing portions 8A overlap each other without colliding with each other, which facilitates packing and handling.

FIG. 5 is a floor finishing material 6 in the soundproof floor structure according to claim (1) or a floor finishing material applied on the flooring cushioning material A arranged on the flooring 1 which is a concrete floor slab. 6
Shows a state in which an impact force P is applied to the upper surface of the. The impact force P is transmitted to the load distribution plate 3 (3A) through the joists 5, and the cushioning material 2
(2A) is compressed between the load distribution plate 3 (3A) and the floor base 1, but the air inside the cushioning material 2 (2A) passes upward through the through holes 31 of the load distribution plate 3 (3A). And cushioning material 2
Escape to the side of (2A). When the elastic body 4A (4A) has air permeability, the air that has escaped upward is elastic body 4A.
If the elastic body 4 (4A) does not have air permeability, it escapes upward through the periphery of (4A) and is contained in the interior of the cushioning material 2 (2A). The reaction force due to the compression of air disappears and the elastic force originally possessed by the cushioning material 2 (2A) is maintained. Further, the impact sound or the walking sound generated on the floor finishing material 6 is generated by the load distribution plate 3 (3A).
Sound is absorbed by the sound absorbing cushioning material 2 (2A) through the through hole 31 of the.

In the soundproof floor structure of claim (1), the load distribution plate 3 and the joist 5
There is the following advantage when the elastic body 4 is interposed between and and the underfloor cushioning material A of claim (2) is used. That is, no impact sound or squeak noise due to friction is generated between the load distribution plate 3 and the joist 5, the weight impact force generated on the floor surface is absorbed by the elastic body 4, and the elastic body 4 (4A) Since cables and pipes can be arranged laterally by utilizing the space corresponding to the thickness of the elastic body, wirings and pipes running vertically and horizontally under the joist 5 can be formed.

When wiring or piping, the thickness of the elastic body 4 (4A) is 2
It is desirable that it be 0 mm or more.

FIG. 6 shows a soundproof floor structure according to claim (1) in which a large number of underfloor cushioning materials A according to claim (2) are juxtaposed on the floor base 1. In this way, by simply arranging the underfloor cushioning materials A side by side with appropriate intervals, a space for extracting the compressed air from the side surface of the cushioning material is formed, and the load distribution plate 3A and the elastic body 4A are arranged at the same time. Since they can be installed, the work of disposing them on the unstable cushioning material 2A becomes unnecessary and the cushioning material 2A is not required.
It will not hurt A.

Hereinafter, specific examples and test results of the inventions of claims (1) and (2) will be shown.

Examples: concrete floor slabs and the like: thickness 150mm cushioning material: Density 64kg / cm ^3, a thickness of 25mm glass wool mat load distribution plate: through hole of 15mm diameter was provided at 30mm pitch, the cushioning material be approximately same in size 2.5 mm thick plywood Elastic body: 5 mm thick plywood resin felt Joist: 18 mm thick wood Floor finishing material: 12 mm thick throw-off plywood and 12 floor material Comparative Example 1: Load distribution plate : Plywood with a thickness of 2.5 mm without through holes Concrete floor slab, cushioning material, elastic body, joist and floor finishing material are the same as in Example 1 Comparative Example 2: Buffer material, load distribution plate, elastic body, joist and 150 mm thick concrete floor slab without floor finishing material. Fig. 7 shows light weight floor impact sound, and Fig. 8 shows the result of measurement of floor impact sound level for heavy floor impact sound according to JIS 1418. In both cases of impact sound and heavy floor impact sound, the level of the floor impact sound level of the concrete example 1 is lower than that of the comparative example 1, and it is confirmed that the improvement effect of the lightweight floor impact sound is particularly large. Was done. this is,
The lightweight floor impact sound is absorbed in the underfloor space through the through hole 31, and the heavy floor impact sound is compressed and deformed by the outflow of air from the through hole 31 so that the air pressure in the cushioning material does not rise. It is presumed that this is due to smoothing.

(Effects of the Invention) As described above, according to the soundproof floor structure of the invention of claim (1) or the underfloor cushioning material of the invention of claim (2),
Stability of the floor surface is maintained by the load distribution plate, and since the cushioning material maintains the original elastic force, it is possible to absorb the impact force generated on the floor surface and at the same time generate on the floor surface. The impact sound or the pedestrian is transmitted to and absorbed by the sound absorbing cushioning material, so that the sound absorbing property is also secured.

Further, in the soundproof floor structure of claim (1), when the floor support is placed on the load distribution plate via an elastic body or claim
When the underfloor cushioning material of (2) is used, no cushioning noise or squeaking noise is generated between the load distribution plate and the floor supporting material, and the weight impact force generated on the floor surface can be absorbed, and ,
Wiring and piping can be provided below the floor support.

Furthermore, according to the underfloor cushioning material of claim (2), the cushioning layer having the placing portion for placing the floor joists is formed simply by arranging the floor joists on the floor foundation, so that the foundation can be efficiently constructed and after the arrangement. Since the upper surface of the cushioning material is protected by the load distribution plate, it does not damage the surface of the cushioning material.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the soundproof floor structure according to the invention of claim (1), FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG. 3 is the invention of claim (2). FIG. 4 is a perspective view of an embodiment of the underfloor cushioning material, FIG. 4 is a perspective view of a modification of the underfloor cushioning material, and FIG. 5 is a sectional view showing the operation of the soundproof floor structure and the underfloor cushioning material. FIG. 6 is a perspective view showing a soundproof floor structure using the above-mentioned underfloor cushioning material, FIGS. 7 and 8 are graphs showing measurement results of floor impact sound level, and FIG. 7 is a lightweight floor impact. In the case of sound, FIG. 8 shows the case of heavy floor impact sound, and FIG. 9 is a sectional view of a conventional floating floor structure. 1 ... Floor base, 2, 2A ... Buffer material, 3, 3A ... Load distribution plate, 4, 4A ... Elastic body, 5 ... Joist, 6 ... Floor finishing material, 8
A ... joist placement part, 31 ... through-hole, A ... under floor cushioning material.

Claims (2)

[Claims] 1. A plurality of sound absorbing cushioning materials made of glass wool mat or the like and formed in a rectangular shape are arranged on a floor substrate made of concrete floor slab or the like with a space between the side surfaces, and the plurality of cushioning materials are provided. A load distribution plate consisting of a perforated plate is arranged on the material, and a floor support such as joists is placed on the load distribution plate directly or via an elastic body, and the floor support is subjected to floor finishing. A soundproof floor structure. 2. A cushioning material for underfloor arranged on a floor base made of concrete floor slab or the like, wherein a load distribution plate made of a perforated plate having substantially the same size as the cushioning material is provided on the upper surface of the sound absorbing cushioning material. An underfloor cushion including a rectangular plate-shaped body formed by being laminated and integrated, and a joist mounting portion made of an elastic body integrally fixed to the upper surface of the load distribution plate of the plate-shaped body Material.