JPH0314505Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to a soundproof floor structure that is optimal as a floor structure for a house.

[Prior art]

The floor structure of a typical detached house or apartment complex is a wooden double-layered structure, and most of the floor structures are constructed using a joist construction method in which particle board or the like is installed on the joists of wood or steel frames.

In houses having such a floor structure, there are many complaints that floor impact noise caused by children jumping on the upper floors is transmitted to the lower floors, and various countermeasures have been taken in the past.

Conventional countermeasures include installing rubber sheets or cork sheets on particle boards, pasting scrap boards between the joists and the boards, and creating a sanderch between them. However, none of these provides a sufficient soundproofing effect in the low frequency range.

[Purpose of invention]

The purpose of the present invention is to obtain a soundproof floor structure that can effectively attenuate even low-frequency impact sounds.

[Summary of the idea]

The soundproof floor structure according to the present invention differs from conventional soundproof structures in which a spring material and a loss material that loses vibration energy are provided on the input side. the elastic member is formed of a foam material, the mass member is coupled to the lower floor side of the floor via the elastic member, and the elastic member and the mass member constitute a dynamic damper to reduce the It is also designed to effectively attenuate high-frequency impact sounds.

[Example of idea]

1 and 2 show a soundproof structure according to a first embodiment of the present invention, in which a flooring material 12 is laid on a plurality of joists 10 extending over a building body.
As the floor material 12, particle board made of compression molded chip material or the like can be used.

A plywood 14 having a width larger than the width of the joist 10 is fixed to the lower end of the joist 10. A foam layer 16 as an elastic member is mounted on the plywood 14 at a portion protruding from the joist 10, and an iron plate 18 as a mass member is mounted on the foam layer 16. This iron plate 18
is a width dimension extending over the entire area between the joists 10, and it is preferable that the spaces between the iron plate 18 and the foam layer 16 and between the foam layer 16 and the plywood 14 be fixed with an adhesive or the like.

As the foam layer 16, any foam such as ordinary polyurethane foam, polyvinyl chloride foam, polyethylene foam, etc. can be used, and the foam material is not particularly limited. However, by using a flexible material with a large loss (loss of vibration energy), it is possible to reduce the weight of the iron plate 18.

Further, as shown in FIG. 2, the foam layers 16 in this embodiment are installed intermittently at intervals in the longitudinal direction of the joist 10, but dimensions such as length can be changed as necessary.

The iron plate 18 acts as an inertial mass and constitutes a dynamic damper together with the foam layer 16. However, this dynamic damper uses a foam layer 16 instead of the spring material used in general dynamic dampers, making it extremely flexible and effective over a wide range of frequencies. . Other materials such as flexible sheets and plywood can be used instead of iron plates.

In this embodiment configured in this way, the flooring material 12
Impact sounds caused by children jumping and jumping on the floors are transmitted from above the flooring material 12 to the joists 10. 10 more joists
is transmitted to the foam layer 16 as a mass member,
The foam layer 16 together with the iron plate 18 as a mass member
vibrates and acts as a dynamic damper. In particular, the foam layer 16 is more flexible than the spring material of conventional dynamic dampers, so it can absorb shock over a wide frequency range.

Next, FIG. 3 shows a second embodiment of the present invention. In this embodiment, particle board 20, compressed foam 22, and veneer plywood 24 are sequentially laid on joists 10. Therefore, the compressed form 22 is composed of particle board 20 and veneer plywood 2.
It has a Sanderutsch structure sandwiched between 4 and 4.

The compressed foam 22 can be easily manufactured by heating and compressing a foamed foam such as polyvinyl chloride, polyethylene foam, or soft urethane foam. This compressed form 22 is 25
A foam material with a compression load of 50 kg/cm ² in % strain is compressed to 1/4, and the plywood veneer 24 has a thickness of 5.5 mm.

Next, FIG. 4 shows the experimental results of the first and second embodiments. In the figure, the conventional example is a general floor structure with the structure shown in FIG. 1 except the foam layer 16 and iron plate 18, and the experimental example 1 is the structure of the first embodiment shown in FIG. When the total eigenvalue is 70 Hz, Experimental Example 2 combines the structures of the first embodiment shown in Fig. 1 whose total eigenvalues of the foam layer 16 and iron plate 18 are 70 Hz, 110 Hz, and 230 Hz, respectively, by area of 1/3. It is something. Further, Experimental Example 3 is a case of the structure of the second embodiment shown in FIG.

The experiment also used a model room with an upper and lower floor of 8 tatami mats, made using wood-based prefabricated materials.
A tapping machine was installed in the center of the upper floor to measure the floor impact sound level on the lower floor.

As is clear from FIG. 4, both the first and second embodiments lowered the floor impact sound level compared to the conventional example, and were found to be particularly effective in the low frequency range.

Next, FIGS. 5 to 8 show third to sixth embodiments of the present invention, and show other examples of attachment of the foam layer and the iron plate 18, etc.

In FIG. 5, the foam layer 16 is in direct contact with the lower surface of the flooring 12, and the iron plate 18 is attached to the lower surface of the foam layer 16.

In Figure 6, the foam layer 16 and the iron plate 18 are the joist 1.
It is attached to the side of 0.

Also, in Fig. 7, in addition to the structure shown in Fig. 1, the iron plate 1
A ceiling 20 is suspended from 8.

Furthermore, in FIG. 8, the plywood 14 in FIG.
A foam layer 16 and an iron plate 18 are laminated on the plywood 14 and placed between the joists 10.

Each of these embodiments can also obtain the same effects as the first and second embodiments, and the present invention is not limited to these examples. Any method that connects mass members via elastic members can be applied.
It goes without saying that the composite floor structure shown in FIG. 3 can also be applied to the embodiments shown in FIGS. 5-8.

[Effect of idea]

As explained above, in the present invention, since the dynamic damper is constituted by the elastic member made of a foam material and the mass member, it is possible to absorb impact sound over a wide frequency range.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the first embodiment of the present invention, Fig. 2 is a sectional view taken along the - line in Fig. 1, Fig. 3 is a sectional view of the second embodiment, and Fig. 4 is a cross-sectional view showing the experimental results. Diagrams showing the relationship between tarp band frequency and floor impact sound level, and FIGS. 5 to 8 are cross-sectional views of the third to sixth embodiments, respectively. 10...joist, 12...flooring, 14...plywood,
16...foam layer, 18...iron plate.

Claims (1)

[Scope of utility model registration request] A soundproof floor structure that prevents vibrations from an upper floor from being transmitted to a lower floor through the floor, comprising a mass member and an elastic member having an eigenvalue corresponding to the natural frequency of the floor, A soundproof floor structure characterized in that the elastic member is formed of a foam material, and the mass member is coupled to the lower floor side of the floor via the elastic member.