KR20140103202A

KR20140103202A - Sheet for preventing noise between floors of building

Info

Publication number: KR20140103202A
Application number: KR1020130015744A
Authority: KR
Inventors: 이재준
Original assignee: (주)지아이엘바이오테크
Priority date: 2013-02-14
Filing date: 2013-02-14
Publication date: 2014-08-26

Abstract

The present invention relates to a sheet for preventing an interlaminar noise, and discloses a sheet made of a polypropylene, a nonwoven fabric, and a honeycomb structure polypropylene excellent in heat insulation and noise shielding effect, and having a hollow portion in the honeycomb structure.

Description

TECHNICAL FIELD [0001] The present invention relates to a sheet for preventing noise between floors,

The present invention relates to a sheet for preventing noise generated between layers of a building, and more particularly, to a sheet for suppressing noise generation by effectively dispersing and absorbing impact energy caused by a floor impact.

One of the most serious environmental problems in apartments such as apartments is the interstory noise. These noise problems cause many social problems, and even noise often leads to killing as well as conflict between neighbors.

In the case of apartment house, the floor noise of the floor is the result of impact energy of the floor impact sound. When the impact caused by human walking or falling of the object and the movement of the object is applied to the floor, It radiates as sound in this air.

The floor impact sound is largely divided into light impact sound and heavy impact sound.

Lightweight impact sound is relatively light and impact sound floor impact sound, the standard value is less than 58 decibels. It is a sound of high-frequency sound transmitted to the lower layer due to falling of a small object and sound applied to the floor when the furniture is moved, and the impact force is small and the duration is short.

Heavy impact sound is relatively heavy and impact sound floor impact sound, the standard value is less than 50 decibels. It is a bass sound generated in the lower layer by a heavy impact when a child runs or runs, and has a large impact force and a long duration.

As a result of actual measurement of light impact sound and heavy impact sound in apartment buildings, the following problems were found.

When the slab thickness of 150mm was applied to the cushioning material such as styrofoam, both the light impact sound and the heavy impact sound did not satisfy the current legal standards.

As the slab thickness increased, heavy impact sound reduction effect was obtained.

When a cushioning material (approx. 3 mm) was attached directly under the floor, the lightweight impact sound satisfied most of the standard values, but the heavy impact sound was insufficient.

The floor impact sound reduction material is effective for light impact sound but has little effect on heavy impact sound.

As for the structural type, the ramen structure applied to the residential building is more effective for the floor impact sound insulation performance than the wall type structure.

It is necessary to increase the stiffness of the structure in order to reduce heavy impact sound. To increase the stiffness of the structure, a method of increasing the thickness of the slab and a method of improving the structure including the slab to a rigid structure are suggested.

The natural frequency of the living room was in the range of 35 ~ 45Hz, and the natural frequency of the room was 45 ~ 60Hz. The natural frequency of the room, 45 ~ 60Hz, affects the measuring frequency band of the heavy impact sound of 63Hz (44.5 ~ 89.1Hz).

Even if the natural frequency of the room and the measured frequency band of the heavy impact sound are equal to each other, even if the floor slab thickness is 240 mm or more, there is a problem that the heavy impact sound may not meet the legal standard. This is because the natural frequencies of the room and the measurement frequency band of the heavy impact sound are frequencies that can cause resonance.

According to the results of this study, light impact sound is not a problem in the floor impact sound of the apartment house. This is because it is easily below the reference value by the buffer material. However, there is a problem that the heavy impact sound is not below the reference value by the cushioning material.

If the problem of heavy impact sound can not be solved by the cushioning material, a method of increasing the rigidity of the slab can be considered. However, since the stiffness of the slab is directly proportional to the second moment of the slab cross section, it is most economical to increase the slab thickness. However, the thickness of the slab can not be increased to make the weight impact sound below the reference value. This is because the construction cost rises when the slab thickness increases.

It is required to increase the building cost and reduce the heavy impact sound. Given the present circumstances, it is not realistic to increase the slab thickness.

It is therefore important to reduce the weight impact sound while maintaining the slab thickness at the current level.

The floor impact sound is transmitted in the form of waves. The waves are transmitted through the medium. The medium is a substance that transmits waves.

The speed of the wave depends on the type of medium. Its speed is the fastest in solid, liquid, and gaseous. Because of the difference in density. The density is in the order of solid → liquid → gas.

Since the vibration is transmitted by the particles of the medium, the density of the particles becomes more dense as the solid, and the vibration becomes faster. The looser like the gas, the slower the vibration becomes.

An object of the present invention is to provide a seat as a floor cushioning material capable of reducing a weight impact sound of a floor impact sound to below a reference value while minimizing the thickness of a slab.

In addition to functioning as a floor cushioning material as described above, a sheet having a sound insulating effect can be obtained by inserting a honeycomb structure polypropylene intermediate layer between member layers formed by pressing a nonwoven fabric on a porous polypropylene member, So as to weaken the noise.

The sheet for preventing noise between buildings according to the present invention has the effect of reducing the building load as a lightweight material as well as blocking noise while minimizing the thickness of the slab. The honeycomb-structured polypropylene intermediate layer can evenly distribute the upper load, thereby greatly reducing the weight impact noise. The porous polypropylene layer, in which the nonwoven fabric constituting the upper and lower layers of the sheet is pressed, prevents resonance due to vibration of the floor and heavy impact sound Effect.

1 is a partially cutaway perspective view of a sheet according to the present invention, and Fig.
2 is a AA cross-sectional schematic view of a sheet according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a sheet for preventing interlayer noise according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view of a sheet according to the present invention, in which the outer layer 10 of the sheet is composed of a nonwoven press-bonded porous polypropylene, and the intermediate layer 30 is a layer of a honeycomb structure made of porous polypropylene And a hollow portion 40 is formed.

The outer layer 10 constituting the sheet is bonded to the nonwoven fabric 20 by pressing the nonwoven fabric 20 in a state in which the porous polypropylene is melted.

The intermediate layer 30 is prepared by providing a porous polypropylene sheet having a honeycomb structure by using a special extrusion apparatus, and details thereof are disclosed in Korean Patent No. 1069132.

The hollow portion of the honeycomb structure can be hermetically closed or open. If the hermetic structure is closed, the gas can be made thin so as to be close to vacuum, thereby further enhancing the sound insulation effect.

Example

2, the upper and lower outer layers 10 are made of porous polypropylene squeezed with a nonwoven fabric 20 having a thickness of about 0.1 to 0.4 mm and a polypropylene having a thickness of about 1.2 to 1.7 mm, 30) is composed of a honeycomb structure made of porous polypropylene and has a thickness of 10 to 15 mm. The hollow portion of the honeycomb structure can be hermetically sealed or open, and it is more preferable to maintain the vacuum state.

The sheet thus constructed is installed so as to be placed between the building finish mortar and the concrete floor to prevent the interlayer noise.

10: outer layer
20: Nonwoven
30: middle layer
40: hollow part

Claims

In the interlaminar sound-insulating sheet,
An outer layer composed of a porous polypropylene to which a nonwoven fabric is pressed, and
Wherein the hollow portion of the honeycomb structure is configured to be hermetically sealed or opened. The sheet for preventing noise according to claim 1, wherein the hollow portion of the honeycomb structure is formed of a porous polypropylene or a honeycomb structure.

The sheet for preventing noise between layers according to claim 1, wherein the porous polypropylene on which the nonwoven fabric is pressed is formed by pressing the nonwoven fabric in a molten state of the polypropylene.

The sheet for preventing noise between layers according to claim 1, wherein the outer layer composed of the porous polypropylene on which the nonwoven fabric is compressed has a thickness of 0.1 to 0.4 mm and a porous polypropylene of 1.2 to 1.7 mm.

The sheet for preventing noise between layers according to claim 1, wherein the intermediate layer made of the honeycomb structure composed of the porous polypropylene has a thickness of 10 to 15 mm.