JPS6040039B2 - Soundproofing method for sounding body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a soundproofing method for sounding bodies such as pipes and ducts, which is inexpensive and has a large noise reduction effect.

As a measure to reduce the noise generated from the surface of piping attached to boiler plants, garbage treatment plants, etc., generally speaking, a sound absorbing material such as glass wool is wrapped directly around the surface of the piping duct, and the outside is covered with a sound insulating material such as hard cement. A method of lowering the level is adopted, but this method has the following drawbacks. '1} Because the pipe and the soundproofing material are in direct contact, the sound transmission loss is relatively small and the overall noise reduction effect is small compared to the cost. [2] If the temperature of the piping is high, the sound absorbing material must be heat resistant.

By providing an air layer between the pipe and the sound absorbing material, the sound transmission loss is increased by 1.3 to 5 times at low vibration frequencies of 1000 days or less.

Two-way piping can be considered to provide this air layer, but it has the drawback of increasing material costs and manufacturing man-hours. The present invention eliminates these drawbacks and improves the outer surface of the sounding body, the sound absorbing material,
This was proposed for the purpose of effective noise reduction by easily creating an air layer between the sound insulating material and other covering materials at a low cost to increase sound transmission loss. In a soundproofing method for a sounding body in which a soundproofing material is covered with a soundproofing material, a corrugated net is inserted between the outer surface of the soundproofing material and the soundproofing material to support the soundproofing material, and a gap is provided between the same outer surface and the soundproofing material. Provided is a soundproofing method for a sounding body characterized by the following.

In the method of the present invention, a corrugated net is inserted between the outer surface of the sounding body and the soundproofing material to support the soundproofing material, thereby easily creating a gap between the outer surface of the sounding body and the soundproofing material at a low cost. be able to. Therefore, the sound transmission loss can be increased in the gap, and the noise reduction effect can be improved. In addition, since a corrugated net is used for the support member, it can be easily deformed into an appropriate shape and thickness to provide a void, and the transmission of blue light from the sounding body through the support member is not a problem. Even if a large amount of the material is used and the porosity of the cavity decreases, the sound transmission loss does not decrease sharply. Next, embodiments of the method of the present invention will be described based on the drawings.

Figures 1 and 2 show the case where the method of the present invention is applied to pipes and ducts that are noise sources.
2 is a corrugated net provided on the outer surface of the tube 1 and the tact 1', and the front and plan views thereof are shown in FIGS. 3A and 3B. Reference numeral 3 denotes a gap provided between the pipe 1 or duct 1', the sound absorbing material 4, and the covered sound insulating material 5 that is in close contact with the sound absorbing material 4.

The corrugated net 2 is a wire net formed into a corrugated shape in order to provide a void 3, and includes a sound absorbing material 4 and a sound insulating material 5.
It has enough strength to support the sound absorbing material 4 and the sound insulating material 5 when tightening the hem. The sound absorbing material 4 is a layer made of a material such as glass wool and absorbs sound, and the sound insulation village 5 is a layer made of a material such as hard cement, which performs sound insulation according to the mass law and fixes the sound absorbing material 4 and the corrugated net 2. It is.

When covered with a soundproofing layer having such a structure, the noise reduction effect is improved by providing the voids 3 and increasing the sound transmission loss. Compared to the case where the sound absorbing material and the sound insulating material have the same thickness, the noise reduction effect is much improved.

Therefore, if the same noise reduction effect is desired, the thickness of the sound absorbing material and the sound insulating material can be made smaller than in the case of a secondary structure, resulting in cost reduction. Further, even when the temperature of the pipe 1 or duct 1' that is the sound source is high, by providing the void 3, it is possible to use a sound absorbing material whose heat-resistant limit temperature is set lower than that. Furthermore, the cavity 3 can be easily provided by simply providing the corrugated net 2 having sufficient strength to support the sound absorbing material 4 and the sound insulating material 5, so construction is extremely simple and inexpensive.

[Brief explanation of the drawing]

1 and 2 are cross-sectional front views of piping and ducts in which the method of the present invention was implemented, and FIGS. 3 a and 3 b are front and plan views of the corrugated net 2. 1... Piping, 1'... Duct, 2...
...Corrugated net, 3...Void portion, 4...Sound absorbing material, 5...Sound insulating material. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. In a soundproofing method for a sounding body in which the outer surface of the sounding body is coated with a soundproofing material, a corrugated net is inserted between the outer surface and the soundproofing material to support the soundproofing material, and a corrugated net is inserted between the outer surface and the soundproofing material to support the soundproofing material. A soundproofing method for a sounding body characterized by providing a cavity.