JP2006308071A - Soundproof pipe body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a soundproof pipe body for easily developing sufficient soundproof performance even when applying a fire-retardant sound absorbing material. <P>SOLUTION: A soundproof pipe 11 has a pipe body 12 and a sound shielding material 13 for covering the pipe body 12 at its periphery. A gap between the outer peripheral face of the pipe body 12 and the inner peripheral face of the sound shielding material 13 is formed as a sound absorbing layer 14. In the sound absorbing layer 14, a glass wool sheet 15 is arranged as the sound absorbing material. The density of the glass wool sheet 15 arranged in the sound absorbing layer 14 is 70 kg/m<SP>3</SP>or less. The fiber length of each of glass short fibers constituting the glass wool sheet 15 is 45 mm or smaller. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a soundproof pipe having a soundproofing function, which is applied to a soundproof pipe such as a building water supply / drainage device and an air conditioner.

The building is provided with piping connected to a water supply / drainage device and an air conditioner. As a pipe constituting such a pipe, a soundproof pipe having a soundproof function is known (see Patent Document 1). Such a soundproof tube includes a tube, a sound absorbing material that covers the outer peripheral surface of the tube, and a sound insulating material that covers the outer peripheral surface of the sound absorbing material. As the sound absorbing material, for example, a foam material made of synthetic resin is used. Yes.
JP 2003-314781 A

  By the way, in a soundproof tube disposed in a place where fire resistance is required, the soundproof tube is also required to satisfy a certain standard for fire resistance. Conventionally, a synthetic resin foam material constituting a sound absorbing material is excellent in sound absorbing property, but it has been difficult to satisfy fire resistance requirements due to the foamed shape and material characteristics. Therefore, by applying glass wool as the sound absorbing material, the standard for fire resistance is satisfied. However, in a soundproof tube provided with a sound absorbing material made of glass wool, a sound absorbing performance comparable to that of a sound absorbing material formed from a synthetic resin foam material is hardly exhibited. In other words, a soundproof tube including a sound absorbing material made of glass wool can exhibit sufficient soundproofing performance unless the thickness of the sound absorbing layer including such a sound absorbing material or the sound insulating layer formed from the sound insulating material is increased. There was a problem that I could not.

  The present invention has been made in view of such conventional circumstances, and the object thereof is to provide a soundproof tube that can easily exhibit sufficient soundproofing performance even when a sound-absorbing material having fire resistance is applied. It is to provide.

In order to achieve the above object, a soundproof tube of the invention according to claim 1 includes a tube body and a sound insulation material covering the periphery of the tube body, and the outer peripheral surface of the tube body and the sound insulation material In the soundproof tube having a sound absorbing layer as a gap with the inner peripheral surface, a glass wool sheet as a sound absorbing material is disposed on the sound absorbing layer so as to cover the outer peripheral surface of the tube, and the glass wool sheet is disposed on the sound absorbing layer. the density of a 70 kg / m ³ or less, and summarized in that the fiber length of the short glass fibers constituting the same glass wool sheet is 45mm or less.

According to this configuration, the glass wool sheet contains a sufficient amount of open cells, and the shape of the open cells is complicated, so that the sound absorbing performance is sufficiently exhibited.
The gist of the invention described in claim 2 is that, in the soundproof tube described in claim 1, the average fiber diameter of the short glass fibers constituting the glass wool sheet is 8 μm or less.

According to this structure, the open cells contained in the glass wool sheet are made finer, and the sound absorbing performance is further exhibited.
The gist of the invention described in claim 3 is that, in the soundproof tube of claim 1 or 2, the thickness of the glass wool sheet disposed in the sound absorbing layer is 10 mm or less.

According to this configuration, it is avoided that the outer diameter of the soundproof tube is excessively large.
According to a fourth aspect of the present invention, in the soundproof tube according to any one of the first to third aspects, the density of the sound absorbing layer in which the glass wool sheet is disposed is 60 kg / m ³ or less. The gist.

  According to this configuration, since the sound absorbing layer can be configured in a state where compression of open cells contained in the glass wool sheet is avoided, the sound absorbing performance of the glass wool sheet is further exhibited.

According to a fifth aspect of the present invention, in the soundproof tube according to any one of the first to third aspects, a gap between the glass wool sheet disposed in the sound absorbing layer and the sound insulating material is The second glass wool sheet is disposed so as to cover the outer peripheral surface of the glass wool sheet, and the density of the second glass wool sheet exceeds 70 kg / m ³ .

According to this configuration, the fire resistance performance of the soundproof tube can be improved by the second glass wool sheet.
The invention according to claim 6 is the soundproof tube according to any one of claims 1 to 5, wherein the glass wool sheet radiates a flame to primary fibers obtained by spinning molten glass. Thus, the gist of the invention is obtained by a flame method in which secondary fibers to be the short glass fibers are formed and the aggregate of the secondary fibers is formed into a sheet.

According to this configuration, the uniformity of the density of the glass wool sheet can be improved, so that the sound absorbing performance is more easily exhibited.
The gist of the seventh aspect of the present invention is that the soundproof tube according to any one of the first to sixth aspects is provided with a covering film that covers the periphery of the sound insulating material.

  According to this configuration, the sound insulating material and thus the sound absorbing material can be protected by the covering film.

  According to the present invention, even when a sound-absorbing material having fire resistance is applied, sufficient soundproof performance can be easily exhibited.

Hereinafter, an embodiment embodying the present invention will be described in detail with reference to FIGS.
As shown in FIG. 1, the soundproof tube 11 in this embodiment includes a tube 12 that is a main body of the soundproof tube 11 and a sound insulating material 13 that covers the periphery of the tube 12. A gap between the outer peripheral surface and the inner peripheral surface of the sound insulating material 13 is configured as a sound absorbing layer 14. In the sound absorbing layer 14, a glass wool sheet 15, which is a sound absorbing material, is disposed so as to cover the outer peripheral surface of the tubular body 12. The soundproof tube 11 constitutes a pipe by being arranged in a building, and such a pipe is connected to a water supply / drainage device or an air conditioner provided in the building. The soundproofing tube 11 has a sound absorbing function for absorbing the sound based on the fluid flow through the tube 12 by the sound absorbing layer 14, and the sound based on the fluid flow propagates to the outside of the soundproofing tube 11. It has a sound insulation function that suppresses this by the sound insulation material 13.

  The tube body 12 is formed of various hard materials and soft materials, and has a cylindrical shape in which a fluid flows. The material for forming the tube body 12 is not particularly limited, and examples thereof include synthetic resins such as polyvinyl chloride and polyethylene, metals, and the like, and these materials are used alone or in combination. That is, the tubular body 12 may be either hard or soft. Furthermore, the tubular body 12 may be configured to be partially bent by configuring a part of the tubular body 12 from a hard material and configuring the other part of the tubular body 12 from a soft material.

The sound insulating material 13 constitutes a sound insulating layer that is an outer layer of the sound absorbing layer 14 and exhibits a function of insulating sound transmitted through the sound absorbing layer 14. More specifically, the sound insulating material 13 has a cylindrical shape whose diameter is larger than the outer diameter of the tubular body 12, and the inner peripheral surface of the sound insulating material 13 is partially supported by a glass wool sheet 15 covering the outer peripheral surface of the tubular body 12. Thus, the tube body 12 is disposed in a state of being separated from the outer peripheral surface. The sound insulating material constituting the sound insulating material 13 is formed of a material having a high specific gravity and a high surface density, so that vibration of the sound insulating material 13 itself is suppressed even if sound propagates to the sound insulating material 13. Has been. Therefore, the sound insulating material 13 exhibits a sound insulating effect that suppresses the sound from leaking from the outer peripheral surface. From the viewpoint of sufficiently exhibiting such a sound insulating effect, the mass per unit area of the sound insulating material 13, that is, the surface density is preferably higher than 1.5 kg / m ^{2, and} more preferably 2.0 kg / m ² or higher. . Specific examples of the sound insulating material include metal thin films and polymer materials (synthetic resins, rubbers, etc.). Examples of synthetic resins include vinyl chloride resins and elastomers typified by polyolefin elastomers, and examples of rubbers include acrylonitrile-butadiene rubber (NBR), styrene-butadiene rubber (SBR), and butyl rubber (IIR). In addition, when applying a polymer material as the sound insulation material, it is preferable to fill the polymer material with a filler from the viewpoint of improving the sound insulation performance, and from the viewpoint of imparting fire resistance, blending thermally expandable graphite It is preferable to do. Examples of the filler include barium sulfate, calcium carbonate, talc, magnesium oxide, alumina, titanium oxide, barite, iron powder, zinc oxide, and graphite.

  The sound absorbing layer 14 exhibits a function of attenuating vibration energy such as sound incident on the sound absorbing layer 14. The glass wool sheet 15 disposed in the sound absorbing layer 14 is disposed between the outer peripheral surface of the tubular body 12 and the inner peripheral surface of the sound insulating material 13 by being deformed according to the outer peripheral shape of the tubular body 12. . In other words, the glass wool sheet 15 is provided such that its sheet surface is wound along the outer peripheral surface of the tubular body 12. The glass wool sheet 15 disposed in the sound absorbing layer 14 functions to convert vibration energy into heat energy by viscous friction of air contained in the open cells contained therein, and as a result, the sound absorbing layer 14 receives incident vibration. Demonstrates the ability to attenuate energy.

FIG. 2 shows a schematic cross-sectional view of a glass wool sheet 15 (glass wool sheet 15 in a state before being arranged on the sound absorbing layer 14) arranged on the sound absorbing layer 14. The glass wool sheet 15 is formed in a sheet form from an aggregate (glass wool) of short glass fibers 16. Since the short glass fiber 16 constituting the glass wool sheet 15 is a non-combustible material, the sound absorbing material, that is, the sound absorbing layer 14 has fire resistance. The density of this glass wool sheet 15 is 70 kg / m ³ or less, and the fiber length of the glass short fibers 16 constituting the glass wool sheet 15 is 45 mm or less. If the density of the glass wool sheet 15 exceeds 70 kg / m ³ , the amount (ratio) of open cells contained in the glass wool sheet 15 becomes insufficient, so that the sound absorbing performance is not sufficiently exhibited. Moreover, when the fiber length of the glass short fiber 16 exceeds 45 mm, the shape of the open cell contained in the glass wool sheet 15 will be simplified, and sound absorption performance will not fully be exhibited. That is, in addition to having the above density, the glass wool sheet 15 formed from the aggregate of short glass fibers 16 having the above fiber length contains a sufficient amount of open cells and the shape of the open cells is complicated. Therefore, the sound absorbing performance is sufficiently exhibited.

The density of the glass wool sheet 15 is preferably 60 kg / m ³ or less, more preferably 50 kg / m ³ or less. In addition, it is preferable that the minimum of this density is 5 kg / m < ³ > or more from a viewpoint of ensuring the shape maintenance property and productivity of a sheet | seat. Moreover, the fiber length of the glass short fiber 16 becomes like this. Preferably it is 40 mm or less, More preferably, it is 35 mm or less. In addition, the lower limit of the fiber length is preferably 5 mm or more from the viewpoint of securing the sheet shape maintainability and productivity.

  The average fiber diameter of the short glass fibers 16 is preferably 8 μm or less, more preferably 7 μm or less, and even more preferably 6 μm or less from the viewpoint of refining open cells contained in the glass wool sheet 15. In addition, it is preferable that the minimum of this average fiber diameter is 0.1 micrometer or more from a viewpoint of ensuring the shape maintenance property and productivity of a sheet | seat. The thickness of the glass wool sheet 15 is preferably 20 mm or less, more preferably 15 mm or less, and even more preferably 10 mm or less from the viewpoint of avoiding an excessive increase in the outer diameter of the soundproof tube 11.

The density of the sound absorbing layer 14 on which the glass wool sheet 15 is disposed is preferably 60 kg / m ³ or less, more preferably 50 kg / m ³ or less, and even more preferably 40 kg / m ³ or less. By setting this density to 60 kg / m ³ or less, the sound absorbing layer 14 can be configured in a state where compression of open cells contained in the glass wool sheet 15 is avoided. The density of the sound absorbing layer 14 is set by the relationship between the difference between the outer diameter of the tubular body 12 and the inner diameter of the sound insulating material 13 (that is, the thickness of the sound absorbing layer 14) and the thickness of the glass wool sheet 15, and the density of the glass wool sheet 15. Is done. Here, if the thickness of the sound absorbing layer 14 is larger than the thickness of the glass wool sheet 15, the glass wool sheet 15 can be disposed while avoiding the compression of the glass wool sheet 15 as much as possible. What is necessary is just to set the thickness of this sound absorption layer 14 suitably according to the thickness and density of the glass wool sheet 15 arrange | positioned. From the viewpoint of sufficiently maintaining the density of the glass wool sheet 15 to be arranged, the thickness of the sound absorbing layer 14 is preferably set to 1.05 to 1.3 times the thickness of the glass wool sheet 15. If the thickness of the sound absorbing layer 14 is set in this way, the glass wool sheet 15 (sound absorbing material) and the sound insulating material 13 are slid with respect to the tube body 12 when the soundproof tube body 11 is connected and the pipe is laid. Therefore, construction becomes easy.

  The density of the glass wool sheet 15 detailed above, the fiber length and average fiber diameter of the glass short fiber 16, and the thickness of the glass wool sheet 15 are values measured in accordance with JIS A 9504: 2004 (artificial mineral fiber heat insulating material). Indicates. The glass wool sheet 15 is obtained by a flame method or a centrifugal method. FIG. 3 shows an explanatory diagram of the flame method. In this flame burning method, first, the primary fiber 34 is spun by the nozzle 33 connected to the glass melting furnace 31, using the molten glass 32 in the glass melting furnace 31 as a raw material. The spun primary fiber 34 is taken up by a take-up roll 35 and guided to a guide 36. A high-pressure burner 37 is provided in the vicinity of the guide 36, and a flame generated by the high-pressure burner 37 is configured to be radiated to the primary fiber 34. That is, a secondary fiber 38 that becomes the glass short fiber 16 is formed from the primary fiber 34 by radiating the flame to the primary fiber 34. And the aggregate | assembly of the secondary fiber 38 is comprised by the secondary fiber 38 being collected on the conveyor 39. FIG. The aggregate of the secondary fibers 38 on the conveyor 39 forms the glass wool sheet 15 by partially fusing the secondary fibers 38 together. In this flame method, it is possible to increase the fusion point between the secondary fibers 38 by further heating the aggregate of the secondary fibers 38 on the conveyor 39 in an oven (not shown). In this flame method, the secondary fibers 38 may be bound to each other by the binder by containing a binder in the aggregate of the secondary fibers 38.

  On the other hand, the centrifugal method (not shown) is a method of forming the short glass fibers 16 by scattering molten glass by centrifugal force. In this centrifugal method, the aggregate of glass short fibers 16 (glass wool) is formed into a sheet by bonding the aggregate of short glass fibers 16 with a binder or the like.

  Among the glass wool sheets 15 obtained by various methods, the glass wool sheet 15 obtained by the flame method is preferable. Since the glass wool sheet 15 obtained by the flame method is excellent in density uniformity among the low density sheets as described above, the sound absorbing performance is easily exhibited.

  As shown in FIG. 1, the soundproof tube 11 of the present embodiment is provided with a covering film 17 that covers the periphery of the sound insulating material 13. The covering film 17 serves to hold the sound insulating material 13 on the tubular body 12 and to protect the sound insulating material 13 and the sound absorbing material. The covering film 17 of this embodiment is comprised from the heat-shrinkable film. The heat-shrinkable film is also called a shrink film, and a shrink film made of polypropylene, polyethylene, polyester or the like is used. Note that the covering film 17 may be omitted.

  In order to manufacture such a soundproof tube 11, first, a glass wool sheet 15 is wound around the tube 12, and then the glass wool sheet 15 is attached to the tube 12 by joining the glass wool sheet 15 with a joint tape. Subsequently, the sound insulating material 13 is attached along the periphery of the glass wool sheet 15 in the same manner as the glass wool sheet 15. In this state, a gap between the outer peripheral surface of the tubular body 12 and the inner peripheral surface of the sound insulating material 13 is configured as a sound absorbing layer 14, and a glass wool sheet 15 is disposed in the sound absorbing layer 14. Finally, the covering film 17 is attached around the sound insulating material 13. When a heat-shrinkable film is used as the covering film 17, the covering film 17 is attached using the shrinkage force generated by heating the heat-shrinkable film.

Next, the operation of the soundproof tube 11 configured as described above will be described.
In a pipe formed by connecting a plurality of soundproof tubes 11, sound based on the fluid passing through the pipe is incident on the sound absorbing layer 14. At this time, the glass wool sheet 15 is disposed in the sound absorbing layer 14. And the density of the glass wool sheet 15 arrange | positioned at the sound absorption layer 14 is 70 kg / m < ³ > or less, and the fiber length of the glass short fiber 16 is 45 mm or less. For this reason, the glass wool sheet 15 disposed in the sound absorbing layer 14 contains a sufficient amount of open cells and the shape of the open cells is complicated, so that the open cells are incident on the sound absorbing layer 14 by such open cells. The vibration energy, which is a sound, is efficiently converted into heat energy. Thus, in addition to the density of the glass wool sheet 15, paying attention to the fiber length of the short glass fiber 16, and using the glass wool sheet 15 having the fiber length of the above value, sufficient sound absorption performance is exhibited for the first time. become.

  Here, although glass wool meets the standards of fire resistance, there is a problem that sound absorption performance that is comparable to that of sound insulation pipes that use synthetic resin foam as a sound absorption material is difficult to achieve with sound insulation pipes that use glass wool as a sound absorption material. there were. That is, in the case of a soundproof pipe using glass wool as a sound absorbing material, it is necessary to make the sound absorbing material and the sound insulating material thick in order to exhibit sufficient soundproofing performance. On the other hand, in the soundproof tube 11 of the present embodiment, the sound absorbing performance comparable to that of a synthetic resin sound absorbing material is exhibited by setting the density of the glass wool sheet 15 and the fiber length of the short glass fiber 16. The thickness of the sound absorbing material and the sound insulating material 13 can be made as thin as possible.

The effects exhibited by this embodiment will be described below.
(1) While the density of the glass wool sheet 15 arrange | positioned at the sound absorption layer 14 of this embodiment is 70 kg / m < ³ > or less, the fiber length of the glass short fiber 16 which comprises the glass wool sheet 15 is 45 mm or less. For this reason, the vibrational energy that is the sound incident on the sound absorbing layer 14 is efficiently converted into thermal energy by the viscous friction of the air in the open bubbles. That is, since the sound absorbing performance comparable to that of the synthetic resin sound absorbing material is exhibited, the sound absorbing material and the sound insulating material 13 can be made as thin as possible. Therefore, even when a sound-absorbing material having fire resistance is applied, sufficient soundproof performance can be easily exhibited. Furthermore, since the thickness of the sound absorbing material and the sound insulating material 13 can be made as thin as possible, the handling of the soundproofing tube 11 is improved, and the ease of construction is maintained when the soundproofing piping is provided. can do.

  (2) By setting the average fiber diameter of the short glass fibers 16 constituting the glass wool sheet 15 to 8 μm or less, the open cells contained in the glass wool sheet 15 are refined. That is, since the shape of such open cells is further complicated, the sound absorbing performance by the sound absorbing layer 14 can be further exhibited.

  (3) In the soundproof tube 11 of this embodiment, even if the thickness of the glass wool sheet 15 is 10 mm or less, sufficient sound absorption performance, and hence sufficient soundproof performance can be exhibited. Therefore, since the outer diameter of the soundproof tube 11 can be avoided from being excessively expanded with respect to the outer diameter of the tube 12, the soundproof tube 11 with better handling properties can be provided. .

(4) If the density of the sound absorbing layer 14 on which the glass wool sheet 15 is disposed is 60 kg / m ³ or less, the sound absorbing layer 14 can be configured in a state where compression of open cells contained in the glass wool sheet 15 is avoided. It becomes like this. Therefore, as a result of the sound absorbing performance of the glass wool sheet 15 itself as described above being reliably exhibited, excellent soundproof performance can be exhibited.

  (5) Even if the glass wool sheet 15 obtained by the flame method is the low-density glass wool sheet 15 as described above, since the density uniformity is excellent, the sound absorbing performance is easily exhibited. Furthermore, since the glass wool sheet 15 obtained by the flame method can utilize the fusion between the short glass fibers 16, even if the glass wool sheet 15 is composed of the short glass fibers 16 having a small fiber length and average fiber diameter, Its shape becomes stable. Therefore, it is possible to continuously exhibit excellent sound absorption performance and, in turn, excellent soundproof performance.

  (6) Since the covering film 17 covering the periphery of the sound insulating material 13 is provided, it is possible to protect the sound insulating material 13 and eventually the glass wool sheet 15 which is a sound absorbing material. As a result, the soundproof performance can be exhibited over a long period of time.

The embodiment may be modified as follows.
A glass wool sheet 15 is disposed on the sound absorbing layer 14. As shown in FIG. 4, in addition to the glass wool sheet 15, a second glass wool sheet 21 may be arranged to constitute the soundproof tube 22. In addition, the density of the 2nd glass wool sheet 21 and the fiber length of the glass fiber which comprises the 2nd glass wool sheet 21 are not specifically limited. That is, the density of the second glass wool sheet 21 may exceed 70 kg / m ³ , and the second glass wool sheet 21 may be composed of glass fibers having a fiber length exceeding 45 mm.

For example, the soundproof pipe body 22 shown in FIG. 4 shows a joint pipe, and such a joint pipe may be disposed in a penetration portion of a fire prevention section in a building. Therefore, a sheet having a high density exceeding 70 kg / m ³ can also be adopted as the second glass wool sheet 21 for the purpose of satisfying the fire resistance standard in the penetration portion of the fire prevention section. More specifically, the second glass wool sheet 21 having a density exceeding 70 kg / m ³ is disposed between the glass wool sheet 15 disposed in the sound absorbing layer 14 and the sound insulating material 13 so as to cover the outer peripheral surface of the glass wool sheet 15. By doing so, the fireproof performance of the soundproof tube 22 is improved. That is, while the sound absorbing performance is exhibited by the glass wool sheet 15, the fireproof performance is improved by the second glass wool sheet 21, thereby providing a soundproof tube 22 that is excellent in both sound absorbing performance and fireproof performance. can do. The soundproof tube body 22 configured as described above can be suitably used as a soundproof tube body 22 that is disposed through a fireproof section in a building, for example, a joint tube. The density of the second glass wool sheet 21 is preferably 80 to 200 kg / m ³ , more preferably 100 to 150 kg / m ³ . If this density is less than 80 kg / m ³ , it may be difficult to exhibit excellent fire resistance. On the other hand, if it exceeds 200 kg / m ³ , there is a possibility that it will be harmful when the soundproof tube 22 is reduced in weight. In addition, you may employ | adopt the sound absorption layer 14 which has the 2nd glass wool sheet | seat 21 as a soundproof pipe body as shown in FIG. 1 other than a joint pipe.

-When connecting the soundproof pipe 11 and laying the soundproof pipe, a soundproof pipe different from the soundproof pipe 11 may be interposed in a part of the soundproof pipe. That is, for example, another soundproof tube body in which the glass wool sheet 15 is changed to a third glass wool sheet having a density exceeding 70 kg / m ³ can be adopted as a part of the soundproof pipe to be laid.

Next, the embodiment will be described more specifically with reference to examples and comparative examples.
(Examples 1 and 2)
After winding a glass wool sheet (obtained by a flame method) around the outer peripheral surface of a vinyl chloride tube (75 mmφ) as a tubular body, the glass wool sheet is joined to the tubular body by joining the glass wool sheet with a joint tape. Installed. Subsequently, a sound insulating material was attached along the periphery of the glass wool sheet in the same manner as the glass wool sheet. In this state, a gap between the outer peripheral surface of the tubular body and the inner peripheral surface of the sound insulating material is configured as a sound absorbing layer, and a glass wool sheet is disposed in the sound absorbing layer. In addition, the sound insulation material used the sound insulation sheet (thickness 1mm, surface density 2.3kg / m < ² >) which made the sound insulation material obtained by mix | blending barium sulfate with an olefin type elastomer. Finally, using a heat-shrinkable film (polyethylene terephthalate shrink film) and using the heat-shrinking force, a covering film was attached around the sound insulating material to produce a soundproof tube. Table 1 shows the density of the glass wool sheet, the fiber length of the short glass fiber, the average fiber diameter of the short glass fiber, the thickness of the glass wool sheet, the density of the sound absorbing layer, and the thickness of the sound insulating material.

(Comparative Example 1)
A soundproof tube was manufactured in the same manner as in the example except that the glass wool sheet shown in Table 1 was used.

(Comparative Example 2)
A soundproof tube was manufactured in the same manner as in the example except that the glass wool sheet shown in Table 1 was used and the sound insulating material had a thickness of 2.5 mm.

(Comparative Example 3)
A soundproof tube was produced in the same manner as in Example except that urethane foam (thickness 5 mm, surface density 0.25 kg / m ² ) was used as the sound absorbing material instead of the glass wool sheet.

<Evaluation of soundproof performance>
The sound level of each example was used to measure the noise level. The measurement environment at this time will be described with reference to FIG. This measurement environment is an environment for measuring drainage sound due to drainage through the soundproof tube. A toilet 53 serving as a drainage source is connected to a pipe 53 disposed in the underfloor space 52, and the pipe 53 is connected to a drainage portion 54 disposed outside the underfloor space 52. The drainage of the toilet 51 is guided to the drainage part 54 through the pipe 53. The pipe 53 includes a horizontal pipe 53a, a vertical pipe 53b, and a joint pipe 53c. The horizontal pipe 53a, the vertical pipe 53b, and the joint pipe 53c are configured as soundproof pipes of respective examples to be measured. The length of the horizontal tube 53a is 2165 mm, and the length of the vertical tube 53b is 2585 mm.

  A noise meter 55 (LA-5120 manufactured by Ono Sokki Co., Ltd.) is disposed in the underfloor space 52, and the noise level when the drainage is passed through the pipe 53 is measured by the noise meter 55. The distance A between the microphone 55a and the horizontal tube 53a of the sound level meter 55 and the distance B between the microphone 55a and the vertical tube 53b are both set to 1000 mm. The measurement of the noise level is an average value obtained by measuring the maximum value ten times. The measurement results (average values) for the soundproof tube of each example are also shown in Table 1.

表１の結果から明らかなように、各実施例の騒音レベルは、比較例１よりも低い。従って、各実施例の防音性能は、比較例１の防音性能よりも優れている。また、比較例２に示すグラスウールシートを用いた場合、実施例と同等の防音性能を発揮させるためには、遮音材の厚さを各実施例の遮音材の厚さの倍以上に設定する必要性が生じる。従って、各比較例のグラスウールシートでは、十分な防音性能を容易に発揮させることができないことがわかる。なお、比較例３は、耐火性を有しない従来の防音管体である。各実施例では、比較例３に匹敵する防音性能が発揮されることから、十分な防音性能を容易に発揮させることができることがわかる。

As is clear from the results in Table 1, the noise level of each example is lower than that of Comparative Example 1. Therefore, the soundproof performance of each example is superior to the soundproof performance of Comparative Example 1. In addition, when the glass wool sheet shown in Comparative Example 2 is used, it is necessary to set the thickness of the sound insulating material to be twice or more the thickness of the sound insulating material of each Example in order to exhibit the same soundproof performance as that of the Example. Sex occurs. Therefore, it can be seen that the glass wool sheets of the comparative examples cannot easily exhibit sufficient soundproofing performance. In addition, the comparative example 3 is the conventional soundproof tube which does not have fire resistance. In each Example, since the soundproofing performance comparable to the comparative example 3 is exhibited, it turns out that sufficient soundproofing performance can be exhibited easily.

The perspective view which shows the soundproof tube of this embodiment. Sectional drawing which shows a sound-absorbing material (glass wool sheet) typically. Explanatory drawing explaining the flame method. The perspective view which shows the example of a change of a soundproof tube. Explanatory drawing explaining the measurement environment of a noise level.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11, 22 ... Soundproof tube, 12 ... Tube, 13 ... Sound insulation material, 14 ... Sound absorption layer, 15 ... Glass wool sheet, 16 ... Short glass fiber, 17 ... Covering film, 21 ... Second glass wool sheet, 32 ... Melting Glass, 34 ... primary fiber, 38 ... secondary fiber.

Claims (7)

In a soundproof tube comprising a tube and a sound insulating material covering the periphery of the tube, and a sound absorbing layer as a gap between the outer peripheral surface of the tube and the inner peripheral surface of the sound insulating material,
In the sound absorbing layer, a glass wool sheet, which is a sound absorbing material, is arranged to cover the outer peripheral surface of the tubular body,
The density of the glass wool sheet arrange | positioned at the said sound absorption layer is 70 kg / m < ³ > or less, The fiber length of the short glass fiber which comprises the glass wool sheet is 45 mm or less, The soundproof tube characterized by the above-mentioned. The soundproof tube according to claim 1, wherein an average fiber diameter of the short glass fibers constituting the glass wool sheet is 8 µm or less. The soundproof tube according to claim 1 or 2, wherein a thickness of the glass wool sheet disposed in the sound absorbing layer is 10 mm or less. Soundproofing tube according to any one of claims 1 to 3, wherein the density of the glass wool sheets arranged sound absorbing layer is 60 kg / m ³ or less. Between the glass wool sheet disposed in the sound absorbing layer and the sound insulating material, a second glass wool sheet is disposed so as to cover the outer peripheral surface of the glass wool sheet, and the density of the second glass wool sheet is 70 kg / m. The soundproof tube body according to any one of claims 1 to ³ , wherein the number exceeds ^three . The glass wool sheet is a flame method in which a primary fiber obtained by spinning molten glass is radiated with a flame to form secondary fibers that become the short glass fibers and a sheet of the aggregate of the secondary fibers. The soundproof tube according to any one of claims 1 to 5, wherein the soundproof tube is obtained. The soundproof tube according to any one of claims 1 to 6, further comprising a covering film that covers the periphery of the sound insulating material.

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