JP2005207537A - Soundproof piping - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide soundproof piping able to exert favorable sound insulating properties even in the condition where it is bent or deflected. <P>SOLUTION: The soundproof piping 10 is equipped with a body pipe 11 bending freely, a first covering 21 formed by winding spirally a first soundproof material 22 on the body pipe 11, and a second covering 31 formed by winding spirally a second soundproof material 32 on the first covering 21. The second soundproof material 32 is arranged covering the side edges of each section of the first soundproof material 22 between the adjoining sections of the first soundproof material 22. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a soundproof pipe applied to a pipe of a building water supply / drainage device or an air conditioner.

  Conventionally, in pipes such as water supply pipes, drain pipes, intake ducts, exhaust ducts, etc. used for building water supply / drainage equipment and air conditioning equipment, the pipes are covered with soundproofing materials, etc., thereby water, air, etc. There is provided a soundproof pipe that reduces noise generated when the fluid flows. On the other hand, as the pipe, in addition to a rigid pipe that is difficult to bend, such as a straight pipe or an L pipe, a flexible pipe having flexibility or flexibility so that the pipe can be freely piped according to a construction site. Is provided. For the purpose of reducing noise with such a flexible pipe, a soundproof pipe as shown in Patent Document 1 has been proposed.

The soundproof pipe includes a main body pipe, a first covering body formed on the outer periphery of the main body pipe, and an outer covering body formed on the outer periphery of the first covering body. The main body tube is formed of a soft resin tape in which a reinforcing body is included. The first covering is formed of a soft foam tape having an open cell structure, which is a soundproof material. The outer casing is formed of a soft non-foamed tape. The soundproof piping is manufactured by integrating these soft resin tape, soft foam tape, and soft non-foam tape in a spiral manner while being integrated by a method such as fusion. It is configured.
JP 2000-304166 A

  However, according to the above conventional soundproof piping, when the soundproof piping is bent or flexed, particularly when it is greatly bent at 90 °, 180 °, etc., noise may leak out at the bent portion or the flexible portion. It was. That is, in the soundproof piping bent or flexible, the soft foam tape extends and becomes thin outside the bent portion or the flexible portion, or the interval between the soft foam tapes increases. For example, when the soft foam tape is stretched and thinned due to bending or flexibility, the first covering does not have a sufficient thickness that can reduce noise, and transmits noise. . In addition, when the space between the soft foam tapes is widened due to bending or flexibility, the soft foam tapes are offset from each other on the surface of the main body tube so that the surface of the main body tube is part of the first covering. A portion that does not cover the surface, that is, a gap is formed, and noise leaks from the gap. Although the bent portion or the flexible portion is covered with the outer cover body, the outer cover body is formed from a soft non-foamed tape, so that an effect such as noise absorption is expected. It is not possible to achieve sound insulation.

  The present invention has been made paying attention to such problems existing in the prior art. An object of the invention is to provide a soundproof pipe capable of exhibiting suitable soundproofing properties even in a bent or flexible state.

  In order to achieve the above object, a soundproof pipe according to a first aspect of the present invention includes a bendable main body tube, and a first soundproof material formed by spirally winding a first soundproof material around the surface of the main body tube. A cover and a second cover formed by spirally winding a second soundproof material around the surface of the first cover, and the second soundproof material is adjacent to the first soundproof material. The gist is that they are arranged so as to cover each side edge of each first soundproofing material between the soundproofing materials.

  According to the said structure, a 1st coating body and a 2nd coating body are each formed from the 1st and 2nd soundproofing material, and exhibit the soundproofing property and reduce the noise generate | occur | produced from the main body pipe | tube. It is. When the main tube is bent or flexed, the first soundproofing material forming the first covering is widened between the adjacent ones on the outside of the bent portion or the flexible portion, and narrowed on the inside. . On the other hand, the 2nd soundproof material which forms the 2nd covering is arranged so that each side edge of each 1st soundproof material may be covered between the adjoining 1st soundproof materials. Therefore, the boundary between the adjacent first soundproof materials is covered with the second soundproof material. For this reason, when the main body tube is bent or flexed, the noise is reduced by the second soundproofing material even if the interval is widened and noise leaks from between the first soundproofing materials. Become. As a result, the soundproof piping can exhibit suitable soundproofing properties even in a bent or flexible state.

  According to a second aspect of the present invention, there is provided the soundproof piping according to the first aspect, wherein the first soundproofing material is adjacent to each other in a state where the main body tube is linearly extended. The point is that they are in contact with each other.

  According to the said structure, between the 1st soundproof materials between the 1st soundproof materials in the state which extended the main body pipe | tube by making each side edge contact left and right, up and down, etc. between adjacent 1st soundproof materials. There is no gap formed. For this reason, even when the space | interval of the 1st soundproof materials in the outer side of a bending part or a flexible part expands when a main body pipe is bent or flexible, the expansion can be suppressed to the minimum. As a result, it is possible to reduce sound leakage from the first covering body when bent or flexible.

  The invention of the soundproof pipe according to claim 3 is the invention according to claim 1 or claim 2, wherein the second soundproof material is adjacent to each other in a state where the main body pipe is extended linearly. The gist is that a gap is provided between them.

  According to the said structure, in the state which extended the main body pipe | tube in the shape of a straight line, adjacent 2nd soundproof materials have a space | interval. For this reason, when the main body tube is bent or flexed, the second covering body has a sufficient margin to narrow the interval between the second soundproofing materials adjacent to each other inside the bent portion or the flexible portion. As a result, the soundproof pipe can be bent or flexed suitably.

The invention of the soundproof pipe according to claim 4 is the gist of the invention according to any one of claims 1 to 3, further comprising an outer covering that covers a surface of the second covering body. To do.
According to the above configuration, the jacket body suppresses the movement of the second soundproofing material forming the second covering relative to the first soundproofing material. For this reason, when the main body tube is bent or flexed, the second soundproof material is prevented from being displaced with respect to the first soundproof material, and the boundary between the first soundproof materials is prevented from being exposed to the outside. It becomes possible. As a result, suitable sound insulation can be maintained.

  According to the present invention, it is possible to provide a soundproof pipe capable of exhibiting suitable soundproofing properties even in a bent or flexible state.

Hereinafter, an embodiment embodying the soundproof piping of the present invention will be described.
FIG. 1 is a partially broken perspective view showing the soundproof piping of the embodiment. The soundproof pipe 10 includes a main body pipe 11, a first covering body 21 provided on the surface of the main body pipe 11, a second covering body 31 provided on the surface of the first covering body 21, and the second The outer cover 41 is provided on the surface of the cover 31. That is, the soundproof pipe 10 has a so-called four-layer structure in which the peripheral wall includes the main body pipe 11, the first covering body 21, the second covering body 31, and the outer covering body 41.

  FIG. 2 is a side view showing the main body tube 11. The main body tube 11 is formed in a cylindrical shape from a wall member 12 wound in a spiral shape with a certain interval and a connecting member 13 provided so as to fill the space between the wall members 12. The wall material 12 is made of a hard material such as metal or synthetic resin. The connecting member 13 is formed of a soft material having flexibility or flexibility such as synthetic rubber, elastomer, and synthetic resin. The main body tube 11 is deformed when the connecting member 13 is bent, bent, stretched, etc., and the interval between the wall members 12 is changed, so that the whole tube 11 is flexible or entirely formed to form an arc shape or the like. It is configured to be bendable so that it can be bent so as to have a curved shape, a semicircular shape, or the like. Further, a connection member 14 for connecting the soundproof pipes 10 or between the soundproof pipes 10 and a header or the like is attached to the end of the main body pipe 11. And the main body tube 11 is configured to circulate a liquid such as water, hot water, waste water, etc., a gas such as hot air, cold air, or air, or a liquid such as liquid or gas mixed with a solid, Noise is generated during the flow of the fluid.

  FIG. 3A is a side view showing a state in which the first covering body 21 is provided on the surface of the main body tube 11, and FIG. 3B is a cross-sectional view in which a part thereof is enlarged. . The first covering body 21 is formed from the first soundproof material 22. The first soundproof material 22 has a band shape and is wound around the surface of the main body tube 11 so as to form a spiral shape. Moreover, the said 1st soundproof material 22 is wound by the space | interval so that each side edge (side surface) may contact between adjacent things. Accordingly, the first covering body 21 is configured such that no gap is formed at the boundary 23 between the adjacent first soundproof materials 22 when the main body tube 11 is in a linearly extended state.

  In addition, in order to make it the structure by which the clearance gap is not formed in the said boundary 23, it is preferable to form the 1st soundproof material 22 in strip | belt shape as mentioned above. This is because, as the shape of the first soundproof material 22 becomes wider, the first soundproof material 22 becomes difficult to follow the surface shape of the main body tube 11 when being wound, and a gap is easily formed. Because it becomes. In addition, since the main body tube 11 is bendable, the first soundproof material 22 is preferably formed in a band shape so as not to hinder the flexibility of the main body tube 11.

  The first sound insulating material 22 includes a sound absorbing layer 24 formed from a sound absorbing material and a sound insulating layer 25 formed from a sound insulating material. The sound-absorbing material suppresses sound reflection by exhibiting a sound-absorbing performance of diffusing and absorbing sound incident inside. The sound insulating material blocks sound propagation through the sound insulating material by exhibiting a sound insulating performance that suppresses sound transmission. The first soundproof material 22 is preferably arranged so that the sound absorbing layer 24 is on the main tube 11 side. This is because it is possible to improve the soundproofing performance by absorbing the noise generated from the main body tube 11 by the sound absorbing layer 24 and then attenuating it, and then insulating the sound by the sound insulating layer 25. Further, when the sound absorbing layer 24 is disposed on the main body tube 11 side, the noise reflected by the surface of the main body tube 11 or the sound insulating layer 25 can be absorbed by the sound absorbing layer 24.

  Examples of the sound absorbing material include porous materials such as foamed resin materials, nonwoven fabrics, glass wool, and rock wool. In this embodiment, a foamed resin material is used from the viewpoint of easy acquisition and processing. Examples of the foamed resin material include ester-based or ether-based urethane, crosslinked or non-crosslinked polyethylene, chloroprene, styrene butadiene copolymer, polypropylene, ethylene vinyl acetate, styrene, and the like, and these are used alone or in combination. . The foamed resin material preferably has an expansion ratio of 10 to 50 times from the viewpoint of improving sound absorption performance. The foamed resin material includes open-cell and closed-cell materials, and any of them may be used. Open-cell foamed material has some or all of the bubbles in the material connected, and is excellent in water absorption and sound-absorbing properties. Closed-cell foamed material is not thermally connected with the bubbles in the material. It has the advantage of being excellent. For example, when the soundproof pipe is used as a drainage pipe that easily generates noise, the sound absorbing layer 24 is preferably formed of an open-cell foam material, and when the soundproof pipe is used as a hot water supply pipe, the sound absorbing pipe is used. Layer 24 is preferably formed of a closed cell foam material.

Examples of the sound insulating material include a material having a high density and a high specific gravity, that is, a material having a high weight. This is because a heavy material is less likely to vibrate and sound vibrations are less likely to propagate. In this embodiment, since the first sound insulating material 22 covers the surface of the main body pipe 11, the weight per unit area is emphasized, not the entire first sound insulating material 22, and the surface is used as a sound insulating material. A density higher than 1 kg / m ² and 10 kg / m ² or less is used. In addition, in order not to disturb the flexibility of the main body tube 11, a material having flexibility, flexibility and the like is used for the sound insulating material of this embodiment. Specific examples of the sound insulating material include metal thin films, vinyl chloride resins, synthetic resins such as elastomers such as polyolefin elastomers, rubbers such as acrylonitrile-butadiene rubber (NBR) styrene-butadiene rubber (SBR), butyl rubber, etc. Examples thereof include molecular materials. In addition, when using a polymer material as a sound insulation material, it is possible to provide sound insulation by being filled with fillers such as barium sulfate, calcium carbonate, talc, magnesium oxide, alumina, titanium oxide, barite, iron powder, zinc oxide, and graphite. Is improved.

  In addition to selecting the sound insulation material as described above, the sound insulation performance can be improved by devising such as eliminating gaps at the periphery of the sound insulation layer 25 and making the sound insulation layer 25 multilayer. Therefore, a configuration in which no gap is formed at the boundary 23 between the adjacent first soundproof materials 22 as described above is a preferable configuration for improving the sound insulation performance. That is, in the adjacent first soundproof materials 22, the sound insulation layers 25 whose side surfaces are in contact with each other function as a substantially integral sound insulation layer in the entire first covering body 21, and sound generated from all parts of the main body pipe 11 is generated. It functions to make sound insulation without leakage.

  FIG. 4A is a side view showing a state in which the second covering 31 is provided on the surface of the first covering 21, and FIG. 4B is an enlarged cross-sectional view of a part in the same state. is there. The second covering 31 is formed from the second soundproof material 32. The second soundproof material 32 has a band shape and is wound around the surface of the first covering body 21 so as to form a spiral. Moreover, the said 2nd soundproof material 32 is wound at intervals so that each adjacent side may not contact each edge (side surface). Therefore, the second covering 31 has a configuration in which a gap 33 is formed between the adjacent second soundproof materials 32 when the main body tube 11 is in a linearly extended state. The second sound insulating material 32 includes a second sound absorbing layer 34 and a second sound insulating layer 35 formed from the sound absorbing material and the sound insulating material mentioned above, respectively.

  The gap 33 is provided so as not to hinder the flexibility of the main body tube 11. That is, when the main tube 11 is bent or flexed, the space between the second soundproof materials 32 is clogged inside the bent portion or the flexible portion, and the gap 33 is narrowed, so that the main tube 11 is bent. Sex is maintained. In order to provide the gap 33, an adhesive tape 36 is adhered to the surface of the second covering 31 as shown by a two-dot chain line in FIG. The adhesive tape 36 suppresses the movement of the second soundproofing material 32 on the surface of the first covering 21 and maintains the winding state of the second soundproofing material 32 by keeping the distance constant. Yes.

  In addition to the method using the adhesive tape 36, the second cover 31 is fixed to the surface of the first cover 21 by adhesion, heat fusion, or the like, and the first cover 21 and the second cover 31 are integrated. A method is also conceivable. However, when the flexibility of the main body tube 11 is taken into consideration, the first covering body 21 and the second covering body 31 are separate from those in which the first covering body 21 and the second covering body 31 are bent integrally. The one in which the second covering 31 is bent while sliding slightly with respect to the first covering 21 is superior in flexibility. Further, the adhesive tape 36 has a property of slightly extending with respect to the pulling force. However, when an adhesive tape having a large elongation such as a soft foam tape is used, the movement of the second soundproof material 32 during bending cannot be sufficiently suppressed, and the winding of the second soundproof material 32 is not possible. There is a risk that the state cannot be maintained. For these reasons, in this embodiment, by sticking the adhesive tape 36 to the surface of the second covering 31, the winding state of the second soundproof material 32, particularly the interval between the second soundproof materials 32 is set. It was set as the structure hold | maintained. For the same reason, an adhesive tape may be attached to the surface of the first covering body 21 to maintain the interval between the first soundproof materials 22.

  The second soundproof material 32 is arranged so as to cover the respective side edges of the first soundproof materials 22 between the adjacent first soundproof materials 22. In the soundproof pipe 10, the boundary 23 between the first soundproof materials 22 is completely covered with the second soundproof material 32 so as not to be exposed to the outside. Accordingly, the soundproofing pipe 10 is configured such that noise that leaks from the boundary 23 is absorbed by the second soundproofing layer 34 of the second soundproofing material 32 and further sound-insulated by the second soundproofing layer 35. It has a configuration with excellent performance.

  The second soundproof material 32 is formed narrower than the first soundproof material 22. In order to reliably cover the boundary 23 between the first soundproof materials 22, the second soundproof material 32 is wound at the same pitch as the first soundproof material 22 (winding per unit length in the length direction of the main body tube). This is because the second soundproof material 32 is preferably narrower than the first soundproof material 22 in order to provide the gap 33 by the same method.

  The band widths of the first soundproof material 22 and the second soundproof material 32 are appropriately set according to the size of the diameter of the main body tube 11. Here, as the size of the diameter of the main body tube 11 increases, the difference in elongation of the peripheral wall increases between the outside and the inside of the bent portion. If the difference in elongation of the peripheral wall is increased, a large gap is likely to be formed at the boundary 23 of the first soundproof material 22 in the first covering 21. Therefore, it is preferable to shorten the band width of the first soundproofing material 22 as the diameter of the main body tube 11 increases. This is because the flexibility of the first covering body 21 is improved by shortening the band width of the first soundproof material 22 and increasing the number of turns per unit length, and the first covering body 21 is connected to the main body tube 11. This is because it becomes difficult to bend or flex following the movement, and it is difficult to form a large gap at the boundary 23. Further, according to the fact that the band width of the first soundproof material 22 is shortened as the diameter size of the main body pipe 11 becomes larger, the band width of the second soundproof material 32 becomes larger in the diameter size of the main body pipe 11. It is preferable to shorten the length as the time elapses.

  FIG. 5 (a) is a side view showing a state in which an outer cover body 41 is provided on the surface of the second covering body 31, and FIG. 5 (b) is an enlarged cross-sectional view of a part in the same state. . The envelope body 41 is formed in a cylindrical shape from a heat-shrinkable film. This heat-shrinkable film is a so-called shrink film formed from a synthetic resin that shrinks when heated, and specific examples of the material include polyvinyl chloride, polyethylene, polyester, polypropylene, and polystyrene. Then, the outer cover body 41 is put on the main body tube 11 in a state where the first cover body 21 and the second cover body 31 are provided, and is mounted by being heated. The outer cover body 41 is configured to fasten the first soundproof material 22 and the second soundproof material 32 to the main body pipe 11 by contraction, and maintain these winding states. Therefore, the outer cover body 41 restricts the large movement of the first covering body 21 or the second covering body 31 with respect to the main body pipe 11 at the time of bending or the like, and the interval between the second soundproof materials 32 is maintained. It is possible to maintain the state and the like. In addition, the second sound insulation material 32 is in close contact with the first sound insulation material 22 by the outer cover body 41, and a gap is formed between the first covering body 21 and the second covering body 31. Leakage of noise from is prevented.

Next, the operation of the soundproof piping will be described below.
6A is a cross-sectional view showing the outside of the bent portion when the soundproof pipe 10 is in a bent state, and FIG. 6B is a cross-sectional view showing the inside of the bent portion when the soundproof pipe 10 is in the bent state. is there. When the soundproof pipe 10 is bent, the main body pipe 11 corresponds to the bending by extending the connecting material 13 between the wall materials 12 outside the bent portion. Moreover, the main body pipe | tube 11 respond | corresponds to a bending by shrink | contracting the connection material 13 between the wall materials 12 inside a bending part.

  Now, outside the bent portion, the first covering body 21 responds to the bending by widening the interval between the first soundproof materials 22, and a gap is formed at the boundary 23. Further, the second covering 31 responds to bending by widening the gap 33 between the second soundproof materials 32. At this time, the second soundproof material 32 is maintained in a state of covering the boundary 23 because the large movement relative to the first covering body 21 is restricted by the adhesive tape 36 and the outer cover body 41. Accordingly, the gap formed at the boundary 23 is closed from the outside by the second soundproof material 32 forming the second covering 31. And the noise which leaked from the said clearance gap is prevented from leaking outside by being absorbed and sound-insulated by the 2nd soundproof material.

  On the other hand, on the inner side of the bent portion, the side surfaces of the first sound insulating material 22 are pressed against each other at the boundary 23 because the side edges of the first sound insulating material 22 are curved or crushed. This corresponds to bending. Thus, since the side surfaces of the first soundproof material 22 are pressed against each other at the boundary 23, noise does not leak from the boundary 23, and the soundproofing pipe 10 exhibits sufficient soundproofing performance. Further, the second covering 31 responds to the bending by narrowing the gap 33 between the second soundproof materials 32. It should be noted that the adjacent second soundproof materials 32 are not in contact with each other at this time, and have a sufficient margin in their interval so that they are in contact with each other only when bent to a large degree of 180 °. Yes.

The effects exhibited by the above embodiment will be described below.
-According to the soundproof pipe 10 of the embodiment, a gap is formed at the boundary 23 between the first soundproof materials 22 that form the first covering 21 when the main body pipe 11 is bent, and even if noise leaks from here, The second covering 31 covering the boundary 23 absorbs and blocks noise. Therefore, the soundproofing pipe 10 can exhibit suitable soundproofing properties not only in the state of being extended linearly but also in the state of being bent. Furthermore, since it is possible to exhibit suitable soundproofing properties even in the bent state, in the flexible state where the main body tube 11 is bent smaller than the bent state, the gap formed in the first covering 21 is the first. 2 is small enough to be covered with the covering 31 and can exhibit suitable soundproofing properties.

  In addition, since the adjacent first soundproofing materials 22 are in contact with each other in a state where the main body tube 11 is linearly extended, the bent state is compared to the case where the first soundproofing materials 22 are separated from each other. When this is done, the gap formed in the first covering 21 can be reduced. In addition, when the side edges (side surfaces) of the first soundproof materials 22 are brought into contact with the left and right, it is possible to suppress the surface of the first covering body 21 from becoming uneven, thereby improving the appearance quality. It is also possible.

  In addition, the second soundproof material 32 is wound at an interval so that a gap 33 is formed. Therefore, even if the soundproof pipe 10 has a four-layered peripheral wall and increases in thickness, the soundproof pipe 10 has a sufficient margin to bend as much as the gap 33 is provided, and can maintain a suitable bendability. Is possible.

  In addition, by providing the outer cover body 41, it is possible to prevent the formation of a gap between the first cover body 21 and the second cover body 31, and the second soundproofing material 32 at the time of bending or the like. Can be prevented from being displaced from the boundary 23 between the first soundproof materials 22.

Examples that further embody the above-described embodiment will be described below.
(Example 1)
A sound insulation sheet material having a thickness of 1 mm and a surface density of 2.3 kg / m ² was formed from a sound insulation material obtained by blending barium sulfate with an olefin elastomer. On the other hand, a sound-absorbing sheet material having a thickness of 5 mm and an area density of 0.25 kg / m ² is formed using an ether-based polyurethane (mold chip product formed by pulverizing urethane manufactured by INOAC Corporation), which is a sound-absorbing material. did. Next, the sound insulating sheet material and the sound absorbing sheet material were bonded using a polyolefin hot melt adhesive to produce a soundproof material. And what cut | disconnected this soundproof material so that a width | variety might be 50 mm was used as the 1st soundproof material, and what was cut | disconnected so that a width | variety may be 40 mm was used as the 2nd soundproof material.

  Subsequently, the first soundproof material is spirally wound around the surface of a flexible main tube (TFJ751F, 75 mmφ, length 1500 mm, manufactured by Sekisui Chemical Co., Ltd.) so as not to form a gap while narrowing the gap. One coating was formed. Then, the adhesive tape was stuck on the surface of the 1st covering, and the winding state of the 1st soundproof material was maintained. In addition, the adhesive tape was stuck so that it might extend in the length direction of a main body pipe | tube at four places of equal intervals at the circumferential direction on the surface of the 1st covering. In addition, among the adhesive tapes adhered to the four places, three parts were attached with the main body tube extending linearly, and the other one was attached with the main body tube bent at 90 °. After that, the main body tube is bent so that the portion where the adhesive tape is attached in a state where the main body tube is bent is outside the bent portion.

  Subsequently, the second covering was formed by spirally winding the second soundproofing material on the surface of the first covering so that the center in the width direction coincided with the boundary of the first soundproofing material. Then, the adhesive tape was stuck on the surface of the 2nd covering, and the winding state of the 2nd soundproof material was maintained. In addition, the adhesive tape sticking method is a state where the main body tube is bent in three places in a state where the main body pipe is extended linearly, and the remaining one place on the outside of the bent portion is bent similarly to the first covering body. I stuck it on.

The surface of the second covering was covered with a film made of polyethylene terephthalate, which is a heat-shrinkable film, and the film was heated to form an outer cover to obtain a soundproof pipe.
Using the soundproof piping obtained as described above, the noise level was measured. The measurement environment at this time will be described. As shown in FIG. 7, in the measurement environment, the toilet 51 is connected to a drainage portion 53 disposed outside the underfloor space 52 via a drainage pipe laid in the underfloor space 52. The drain pipe includes a soundproof pipe 10 bent at about 90 ° in the center in the length direction, straight pipes 54 a connected to both ends of the soundproof pipe 10, and the straight pipes 54 a connected to the toilet 51 and the drainage section 53. It is formed from a joint pipe 54b connected to each drain port. The straight pipes 54a and the joint pipes 54b were subjected to a soundproofing treatment (product of CCI, trade name: sound nine, 75 mmφ). Moreover, the length of each straight pipe 54a was 1250 mm connected to the upper end of the soundproof pipe 10, and 1200 mm connected to the lower end.

  And the noise meter 55 was arrange | positioned inside the underfloor space 52, and the maximum value of the noise level when drainage was distribute | circulated in the drain pipe with this noise meter 55 was measured 10 times in total. The sound level meter 55 was LA-5120 manufactured by Ono Sokki. The sound level meter 55 is arranged such that the microphone 55a is positioned at a distance A of 1000 mm from the upper end of the soundproof pipe 10 and a distance B from the lower end of the soundproof pipe 10 of 1000 mm. The measurement result was 48.5 dB as an average of 10 measurements.

(Example 2)
In Example 1, after the first covering was formed, the pressure-sensitive adhesive tape was not adhered, the surface of the first covering was covered with a film made of polyethylene terephthalate, which is a heat-shrinkable film, and the inner covering was obtained by heating the film. A body was formed and the wound state of the first soundproof material was maintained. Moreover, after the formation of the second covering body, the outer covering body was formed without sticking the adhesive tape. In this manner, a soundproof pipe was obtained in the same manner as in Example 1 except that the adhesive tape was not attached and the inner cover was provided on the surface of the first covering. In addition, the soundproof piping obtained without sticking the adhesive tape has no limitation in the bending direction, and can be bent in any direction.

  Using the soundproof piping obtained as described above, the maximum value of the noise level was measured 10 times in total in the same measurement environment as in Example 1. The measurement result was 48.6 dB as an average of 10 measurements.

(Comparative Example 1)
In the same measurement environment as in Example 1, the main body pipe (TFJ751F, 75 mmφ, length 1500 mm, manufactured by Sekisui Chemical Co., Ltd.) is connected between a pair of L-shaped pipes 54 in place of the soundproof pipes, and the maximum noise level is totaled. Was measured 10 times. The measurement result was 55.0 dB as an average of 10 measurements.

(Comparative Example 2)
Only the first covering was provided on the surface of the main body tube (TFJ751F, 75 mmφ, length 1500 mm manufactured by Sekisui Chemical Co., Ltd.) to produce a connecting tube. In the same measurement environment as in Example 1, the connection pipe was connected between a pair of L-shaped pipes 54 instead of the soundproof pipe, and the maximum value of the noise level was measured 10 times in total. The measurement result was 52.7 dB as an average of 10 measurements.

(Discussion)
From Examples 1 and 2 and Comparative Examples 1 and 2, the soundproof piping has a noise level of 6.4 or 6.5 dB compared to the main tube alone, and 4.1 or compared to the connecting tube. It was measured to be 4.2 dB lower. In addition, the noise level of the connection pipe is only 2.3 dB lower than that of the main body pipe alone, and the degree of reduction is smaller than that of the comparison between the soundproof pipe and the connection pipe. In addition, the comparison between Example 1 and Example 2 shows that the difference in noise level is only 0.1 dB, and that the soundproofing is not affected by the presence or absence of adhesive tape or heat-shrinkable film. It was. From these results, by arranging the second soundproofing material so as to cover the boundary of the first soundproofing material, it is possible to exhibit suitable soundproofing properties even when the soundproofing pipe is bent. It has been shown.

In addition, this embodiment can also be changed and embodied as follows.
The outer cover body 41 may be omitted if it is possible to prevent displacement of the second soundproof material 32 and the like. Alternatively, the sticking of the adhesive tape 36 may be omitted, and the wound state of the second soundproof material 32 may be held only by the outer cover body 41.

  An inner covering made of a shrink film similar to the outer covering 41 may be interposed between the first covering 21 and the second covering 31. That is, the peripheral wall of the soundproof pipe 10 may have a so-called five-layer structure including the main body pipe 11, the first covering body 21, the inner covering body, the second covering body 31, and the outer covering body 41. The inner body functions as a member that maintains the wound state of the first soundproof material 22 that forms the first covering 21. Note that the peripheral wall of the soundproof pipe 10 may have a structure of six layers or more.

  The second sound insulating material 32 may be composed of only the second sound insulating layer 35. Also in this case, there is no gap between the second sound insulation layer 35 of the second sound insulation material 32 and the sound insulation layer 25 of the first sound insulation material 22, and the sound insulation layer is multilayered, thereby providing sufficient sound insulation performance. It is possible to demonstrate.

The second soundproof material 32 may be wound with a small interval so that the gap 33 is not formed.
The first soundproof material 22 may be wound so that a gap is formed at the boundary 23 as long as the first soundproof material 22 can be covered with the second soundproof material 32.

  The first soundproof material 22 may be wound so that adjacent side members overlap each other and come into contact with each other. In addition, when the first soundproof material 22 is wound, when the side edges are brought into contact with each other in the vertical direction, it is possible to further reduce the interval expansion at the time of bending or to increase the interval at the time of bending compared to the case where the side edges are contacted left and right. It is possible to eliminate the formation of a gap due to.

-Soundproof piping is not limited to use as a drain pipe, but may be used as a water supply pipe, hot water supply pipe, intake duct, exhaust duct, or the like.
Further, the technical idea that can be grasped from the embodiment will be described below.

  (1) The first soundproofing material and the second soundproofing material are each formed in a band shape, and the second soundproofing material is equal in width to the first soundproofing material or the first soundproofing material. 5. The soundproof pipe according to any one of claims 1 to 4, wherein the soundproof pipe is formed to be narrower in comparison.

  (2) The first soundproofing material has a sound absorbing layer made of a sound absorbing material and a sound insulating layer made of a sound insulating material, and on the inner side on the main body tube side in a state where the first covering is formed. The soundproof pipe according to any one of claims 1 to 4, wherein the sound absorbing layer is disposed.

The perspective view which fractured | ruptured a part which shows the soundproof piping of embodiment. The side view which shows a main body pipe | tube. (A) is a side view which shows the state which provided the 1st coating body on the surface of the main body pipe | tube, (b) is sectional drawing which shows the same state. (A) is a side view which shows the state which provided the 2nd coating body on the surface of the 1st coating body, (b) is sectional drawing which shows the same state. (A) is a side view which shows the state which provided the outer cover body on the surface of the 2nd covering, (b) is sectional drawing which shows the same state. (A) is sectional drawing which shows an outer side in the bending part of soundproof piping, (b) is sectional drawing which shows an inner side in the bending part of soundproof piping. The conceptual diagram which shows the measurement environment of an Example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Soundproof piping, 11 ... Main body pipe, 21 ... 1st covering, 22 ... 1st soundproofing material, 23 ... The boundary between adjacent 1st soundproofing materials, 31 ... 2nd covering, 32 ... 1st 2 soundproofing materials, 33... Gap, 41.

Claims (4)

A bendable main body tube, a first cover body formed by spirally winding a first soundproof material on the surface of the main body tube, and a second soundproof material spirally formed on the surface of the first cover body A second covering body formed by winding, and the second soundproofing material is disposed so as to cover each side edge of each first soundproofing material between the adjacent first soundproofing materials. Soundproof piping characterized by being. 2. The soundproof pipe according to claim 1, wherein the first soundproofing materials are adjacent to each other and the side edges are in contact with each other in a state where the main body pipe is extended linearly. The state according to claim 1 or 2, wherein the second soundproofing material is adjacent to each other in a state where the main body tube is linearly extended, and a gap is provided between them. Soundproof piping. The soundproof pipe according to any one of claims 1 to 3, further comprising a jacket body that covers a surface of the second covering body.

Images