JPS6117664A - Floor impact sound reducing structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a floor impact noise reduction structure that is optimal for the floor structure of a detached house.

[Background Art] FIG. 5 shows the floor and ceiling structure of a typical detached house. Flooring material 12 is laid on joists 10 that are laid horizontally at predetermined intervals, and hanging trees 14 are extended from the joists 10 to edges 16. A ceiling material 20 is suspended via a field support 18. In addition, in the conventional example shown in Fig. 6, the joist lO is large
It differs from Fig. 5 in that it is placed above Fig. 2.

In houses with such a floor structure, there is a high possibility that floor impact noise caused by children jumping on the upper floor will be transmitted to the lower floor.
Hz) and medium and high frequency ranges (2501 (Hz and above)), there was no countermeasure, and improvements were desired.

[Object of the Invention] In consideration of the above facts, the present invention aims to obtain a floor impact sound reduction structure that can absorb floor impact sound particularly effectively in the low frequency range and the medium frequency range.

[Summary of the invention] In the floor impact noise reduction structure according to the present invention, a spring material made of a foam material and a restraining mass are attached to the impact sound emitting side to absorb vibrations based on the principle of a dynamic damper, and the lower floor ceiling is equipped with a shearing material made of an elastic material. Since the structure is elastically supported by deformation, the natural frequency is lowered for medium frequencies and above, reducing floor impact noise in the entire frequency range as a whole.

[Embodiment of the Invention] FIG. 1 shows a floor impact noise reduction structure according to a first embodiment of the present invention, in which a flooring material 26 is laid on a plurality of joists 24 that are extended to the building body. It's included. As the floor material 26, particle board made of compression molded chip material can be used.

A plywood 28 having a width larger than the width of the joist 24 is fixed to the lower end of the joist 24. This plywood 28
A foam layer 30 is mounted on the part protruding from the joist 24, and an iron plate 32 is mounted on these foam layers 30''.
is installed.

The iron plate 32 has a width that spans the entire area between the joists 24, and it is preferable that the iron plate 32 and the foam layer 30 and the foam layer 30 and the plywood 28 be fixed with an adhesive or the like.

The foam layer 30 is a normal polyurethane foam,
Foams such as polyvinyl chloride foam and polyethylene foam can be used. By using a flexible material with a large loss (loss of vibrational energy) for the foam layer 30, it is possible to reduce the weight of the iron plate 32.

The iron plate 32 acts as a restraining additional mass and the foam layer 30
Together, they form a dynamic damper. iron plate 32
Other materials such as flexible sheets and plywood can also be used instead. .

The plywood 28 has a support plate 3 at a location corresponding to the bottom of the joists 24.
One end of 4 is fixed. This support plate 34 has an iron plate L
The structure is bent into a shape, and a vibration isolating rubber 36 is attached to the other end.
are vulcanized and bonded.

The anti-vibration rubber 36 has a hexahedral shape and has a hardness of JIS hardness 4.
A range of 0 to 60 degrees is preferred.

The upper end of the support plate 38 is vulcanized and bonded to the opposite side of the vibration-proofing rubber 36 from the surface on which it is attached to the support plate 34 . Support plate 38
is parallel to the mounting surface of the support plate 34 to the vibration isolating rubber 36,
In the installed state shown in FIG.
The attachment portion to the support plate 34 is arranged slightly above the attachment portion to the support plate 34, so that the vibration isolating rubber 36 has a rhombic shape.

The lower end of the support plate 38 is fixed to a field edge support 4o, and the field edge support 40 holds the ceiling board 44 via the field edge 42.

Next, the operation of this embodiment will be explained.

Impact sounds caused by children jumping on the flooring 26 are transmitted from the flooring 26 to the joists 24. Further, the vibration is transmitted from the joist 24 to the foam layer 30, and the foam layer 3o vibrates together with the iron plate 32, which is an additional restraining mass, and acts as a dynamic damper. In particular, 7 ohm i30 is more flexible than the spring material of conventional dynamic dampers, so 31.5Hz
Shock can be absorbed in a relatively wide low frequency range between 250H2 and 250H2.

In addition, a part of the impact sound is transmitted to the support plate 34, but the vibration isolating rubber 36 blocks this and prevents vibrations of medium frequencies or higher than 250H2 from being transmitted to the lower floor.

Therefore, in this embodiment, impact sound can be absorbed over a wide range of frequencies by the vibration absorption by the foam layer 3o and the iron plate 32 and the vibration damping effect by the vibration isolating rubber 36.

FIG. 2 shows the experimental results in this example.
The floor impact sound level versus frequency is compared with the conventional example in FIG. This shows that vibration absorption is possible over a wide range of frequencies.

Next, FIG. 3 shows a second embodiment of the invention. This embodiment corresponds to the conventional example shown in FIG.
It is used to support 6. The support plate 38 of this embodiment is different from the previous embodiment in that it is attached to the field fence 40 via a hanging tree 46.

FIG. 4 shows the floor impact sound level with respect to frequency showing the experimental results of this second embodiment, and it can be seen that the floor impact sound is reduced over a wide range of frequencies.

Note that since the vibration isolating rubber 36 used in each of the above embodiments is configured to support the ceiling plate by shearing force, the vertical direction can be reduced. Also, this support plate 34. Support plate 38
The height can be adjusted, and it is also possible to suspend the ceiling board by using a combination of bolts and nuts.

[Effects of the Invention] As explained above, in the floor impact noise reduction structure according to the present invention,
Since the foam material is provided with an elastic body that is elastically supported by additional restraint mass and shear deformation, it has an excellent effect of being able to reduce floor impact noise over a wide range of frequencies.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a first embodiment of the floor impact noise reduction structure according to the present invention, FIG. FIG. 3 is a sectional view showing the second embodiment of the present invention, FIG. 4 is a line diagram corresponding to FIG. 2 showing the results of the second embodiment, and FIGS. 5 and 6 are sectional views showing the conventional example. It is. 24... Joist, 26... Floor material, 30... Foam layer, 3211... Iron plate, 34... Support plate. 36... Vibration-proof rubber, 38... Support plate.

Claims (1)

[Claims] (1) When the upper floor is the impact sound input side and the lower floor is the impact sound emission side, a spring material made of foam material and a restraining additional mass are installed on the impact sound emission side to prevent impact noise, and the ceiling of the lower floor is is a floor impact noise reduction structure characterized by being elastically supported by shear deformation of an elastic body.