JPH1137379A - Sound absorbing material for piping and soundproof construction for water of hot water feed piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To economically and speedily reduce noise of water or hot water feed piping by including a bulky fiber in fiber so as to suppress change in restoration according to temperature change and to maintain sound absorbing performance. SOLUTION: A piping soundproof construction 27 is constituted by joining a straight pipe 1 in the lateral direction, an elbow 2 and a straight pipe 3 in the vertical direction together. The outer circumference of the elbow 2 is covered by a piping soundproof material 8 including an insulating material layer 4, a damp proof material layer 5, a sound absorbing material layer 6 and a sound insulating material layer 7, and the portion of the outer circumference of the straight pipe 1 not covered with the piping soundproof material 8 is covered with a piping soundproof material 13 including an insulating material layer 9, a damp proof material layer 10, a sound absorbing material layer 11 and a sound insulating material layer 12. Also, in the neighborhood of the special form part of the straight pipe 3 adjacent to the elbow 2, the same location as the straight pipe 1 is covered by a piping soundproof material 18 including an insulating material layer 14, a damp proof material layer 15, a sound absorbing material layer 16 and a sound insulating material layer 17. The sound absorbing material layers 6, 11 and 16 include hollow fibers, and they show excellent stability against temperature change.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproofing material for effectively reducing noise generated by a substance passing through a pipe. In particular, the present invention relates to a pipe soundproofing material that is effective when there is a difference between the temperature of a substance in a pipe and the temperature of air or the like outside the pipe.

[0002]

2. Description of the Related Art In recent years, heat insulation and airtightness of houses have been advanced, and not only the thermal efficiency in indoors has been improved, but also outdoor noise has become difficult to enter indoors. Along with that, the noise generated indoors becomes harsh sound, and the use of soundproofing materials has begun to be rapidly used for drain pipes that have not been regarded as a problem and have not been taken measures, and the use of soundproofing materials is becoming a common sense. .

[0003] On the other hand, if the drainage noise is reduced, sound absorption and noise during hot water supply start to be pointed out. Conventionally, a heat insulating material or a moisture proof material is used for the outer periphery of the drainage pipe to prevent freezing in winter,
Prevention of condensation at high humidity. Further, a heat insulating material is surrounded by the hot water supply pipe to prevent loss of heat energy.

[0004]

Although the current water supply or hot water supply pipe is coated with a heat insulating material, such a heat insulating material does not function as a soundproofing material and has no effect on water supply or hot water supply noise. .

[0005] In a house, a water supply pipe and a hot water supply pipe are often provided side by side, and in recent years, in particular, the plumbing route is extremely complicated due to the large number of plumbing equipment. The proper use of the soundproofing material for the water supply pipe and the hot water supply pipe may cause a construction error, and it is preferable to treat the same soundproofing material as much as possible.

[0006] Further, after the pipe is constructed, it is housed on a wall, ceiling, floor, or the like, and is buried in the ground. Such a pipe is rarely regularly inspected for maintenance. Unless a serious problem occurs, it is rarely modified. Therefore, the soundproofing material used for such piping is required to maintain its effect for a long period of time.

The present invention is effective in preventing noise in a water supply pipe,
Moreover, it is an object of the present invention to obtain a pipe soundproofing material that is effective for preventing noise in a hot water supply pipe.

[0008]

SUMMARY OF THE INVENTION According to the present invention, there is provided a sound absorbing material for piping which is provided on the outer periphery of the piping and which can effectively reduce noise generated from the piping. This pipe sound absorbing material includes a fibrous material composed of an aggregate in which fibers are fixed to each other. In the present invention, this fiber contains a bulky fiber, and in the sound-absorbing material, a change in resilience due to a temperature change is suppressed.

The present inventor studied water supply noise and hot water supply noise using various sound absorbing materials. As a result, it was found that in the water supply pipe, dew condensation occurred on the heat insulating material side due to poor construction or breakage of the moisture proof material, and the water supply noise became loud. In addition, it was found that general soundproofing materials are easily affected by temperature, and have a low soundproofing effect when used in a hot water supply pipe. From this point of view, it is necessary for a soundproofing material suitable for a water supply pipe and to be commonly used for a hot water supply pipe to exhibit high soundproofing performance even at high temperatures.

The effect of the damping material is particularly high for preventing pipe noise. However, many of such vibration damping materials have temperature characteristics and generally have a performance peak at room temperature. In a hot water supply pipe using such a vibration damping material, the noise level of the pipe increases as the temperature around the hot water supply pipe increases.

The present inventor has developed a sound-absorbing material capable of maintaining soundproof performance from low to high temperatures. This sound absorbing material contains a bulky hollow fiber or a conjugate fiber in a fibrous material composed of an aggregate in which fibers are fixed to each other. Surprisingly, these fibrous materials maintain high resilience irrespective of temperature changes and exhibit an extremely excellent dynamic vibration absorbing effect.

In recent homes, a water tap of a plumbing device is made one-touch, and a high water supply pressure is required. In particular, in areas where there are many dwellings on the slope, there may be a large difference in water supply pressure. For this reason, in some areas, the water supply pressure is about 9 kgf / cm ^2, and noise is generated due to the high water supply pressure.

In order to eliminate such noise, the present inventor has proposed:
Investigations were made on the location of noise in the water supply and hot water supply pipes, the frequency of noise to be countermeasures, and so on. As a result, it was found that the noise generation site is a site where the flow direction changes in both the water supply and hot water supply pipes, and that the noise is also increased in the vicinity thereof.
In addition, it was found that the noise frequency of such a portion was high on the high frequency side.

The inventor of the present invention has developed a pipe soundproofing structure in which a deformed portion of the pipe and the vicinity of the deformed portion of the pipe are intensively treated with a predetermined pipe soundproofing material. If the noise generation part is soundproofed in consideration of the noise frequency, it is possible to most effectively prevent the pipe noise.

[0015] The water supply pipe and the hot water supply pipe generally have a common point that the pipe diameter is small. For this reason, such piping is fixed to a portion having relatively low rigidity, and the vibration of the piping causes boards such as walls to vibrate, causing noise. In fact, the present inventor has found that the frequency of occurrence of noise is high and the noise is high even at the part where the pipe is supported by the skeleton and at the part where the pipe is attached to the water supply or hot water supply equipment. In addition, it turned out that the factor of the low frequency side is high as the frequency of the noise to be countermeasures.

The inventor of the present invention intensively treats the different diameter portion of the pipe and the vicinity of the different diameter portion with a predetermined pipe soundproofing material, further covers the pipe support portion with the predetermined pipe soundproofing material, and surrounds the surrounding area. We have developed a soundproofing structure for pipes, which is covered with a fixing member that is higher in rigidity than the soundproofing material for the pipes, and has a concentrated soundproofing treatment. If the noise generation part is soundproofed in consideration of the noise frequency, it is possible to most effectively prevent the pipe noise.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The sound absorbing material of the present invention contains a fibrous material. In such a fibrous material, fibers are fixed to each other to form an aggregate, and have a shape such as a sheet shape, a mat shape, and a tubular shape. Depending on the thickness and density of the fibrous material, a difference occurs in the sound absorbing performance of the sound absorbing material. In the present invention, a bulky fiber is used as a fiber used for such a fibrous material.

The bulky fiber according to the present invention needs to provide the sound absorbing material with resilience to withstand temperature changes. The shape of the bulky fiber is not particularly limited as long as the sound absorbing material including the bulky fiber exhibits such a restoring property. Examples of the bulky fiber include a hollow fiber and a conjugate fiber.

The sound absorbing material of the present invention is not limited to hollow fibers and conjugate fibers, but can maintain the thickness of the fibrous material as a whole, has excellent elasticity and resilience, and imparts a certain density to the sound absorbing material. Fibers that can be used are used.
Therefore, it is desirable to select a fiber having an appropriate shape in consideration of the fiber diameter, length, heat resistance, and the like, from the balance with the heat insulating material and the sound insulating material.

In the present invention, a bulky fiber having a hollow portion and an increased bulk can be used. As such a bulky fiber, a hollow fiber having a hole in the length direction of the fiber is preferable. Such hollow fibers are lightweight, suitable bulkiness, elasticity,
This is because it has expandability and is excellent in restorability.

In piping affected by temperature, such as a hot water supply pipe,
When the heat insulating material is a foam of closed-cell polymer or rubber, the spring action becomes weaker as the temperature becomes higher. When the sound absorbing material is made of open-cell polymer or rubber, the sound absorbing material has a weaker spring action than the heat insulating material. For this reason, the heat insulating material and the sound absorbing material do not have enough force to expand the sound insulating material on the outer periphery, and the dynamic vibration absorbing effect deviates from an appropriate range. The sound-absorbing material containing the hollow fiber of the present invention has a force for securing the thickness of the fiber and expanding the sound insulating material on the outer periphery together with the expanded air due to expansion of air between fibers, bulkiness of the fiber, and resilience of the fiber. Works, and the dynamic vibration absorbing effect easily enters an appropriate range.

The sound absorbing material containing such hollow fibers is surrounded by a heat insulating material and a sound insulating material, and as the temperature rises, the thickness of the sound absorbing layer itself increases more than that of the sound absorbing material containing solid fibers, and a stronger spring effect is obtained. Demonstrate. Such a sound absorbing material can compensate for a decrease in the spring action of the heat insulating material due to a high temperature, and can maintain sound absorbing performance.

Further, the sound absorbing material including such hollow fibers has a dynamic vibration absorbing effect and a vibration preventing effect due to the series spring effect of the heat insulating material and the sound absorbing material if the sound insulating layer is added in weight. Further, since the heat insulating material is relatively thick in order to exhibit the heat insulating effect, the thickness from the pipe to the sound insulating material can be increased via the sound absorbing material, so that the sound absorbing effect is improved.

The hollow fiber according to the present invention contains at least 30% by weight, preferably at least 50% by weight of the total weight of the fibrous material. This is because a fibrous material containing 30% by weight or more of hollow fibers exhibits a stronger spring effect as the temperature rises, and exhibits good dynamic vibration absorbing effect and sound absorbing performance.

The hollow structure of the hollow fiber can be made of various synthetic fibers such as rayon or acetate of a cellulosic fiber, and any material may be used. Further, the cross-sectional shape is not limited to a round shape, but may be a polygon such as a triangle or a square, or other various shapes. The shape and number of the holes are not limited, but preferably, the ratio of the volume of the holes to the volume of the fibers, that is, a hollow fiber having a hollow ratio of 10 to 50% and a fiber diameter of 0.5 to 30 denier is preferable. .

In the present invention, a bulky fiber whose fiber is shrunk to increase its bulk can be used. As such bulky fibers, conjugate fibers can be suitably used. Such conjugate fibers are preferably bulky and have high resilience as an aggregate of fibers. The conjugate fiber can be molded to have a high shrinkage portion and a low shrinkage portion, and by shrinking the high shrinkage portion and the low shrinkage portion, it is possible to obtain a fiber that has shrunk and has increased bulk. it can.

The high shrinkage portion and the low shrinkage portion only need to be included so as to cause the fibers to shrink and increase the bulk of the fibers. Preferably, a single fiber, when viewed in cross-section, includes a high shrinkage portion and a low shrinkage portion, causing shrinkage. This is because the fibers are easily crimped and the sound-absorbing material has a large restoring property. It does not matter whether the high and low shrinkage portions are symmetric or asymmetric in cross section of the fiber.

The high shrinkage portion and the low shrinkage portion respectively
High and low shrinkage polymers can be used. There is no restriction on the material of each polymer. The high-shrinkage polymer and the low-shrinkage polymer shrink by a treatment such as heat treatment, causing the fibers to shrink.

The conjugate fiber is contained in an amount of at least 25% by weight, preferably at least 50% by weight, based on the whole fibrous material. The resulting sound absorbing material has good overall resilience,
It also has bulkiness and provides good sound absorption performance.

The fibrous material other than the bulky fiber can be included in the sound absorbing material at a ratio of the above-mentioned hollow fiber, conjugate fiber or the like. As such a fibrous material, a fibrous material applied to ordinary piping is used.

Such fibrous materials include various metal fibers, glass wool, rock wool, carbon fibers, etc., inorganic fibers, animal fibers such as wool and silk, vegetable natural fibers such as cotton, hemp, pulp, rayon, acetate, and the like. Fibers made from cellulosic fibers of vegetable natural fibers such as cupra, polyimide fibers such as nylon, polyvinyl fibers such as vinylon, acrylic fibers, polyester fibers, vinyl chloride fibers, vinylidene chloride fibers, polyethylene, Polyolefin fiber such as polypropylene, polycarbonate fiber, polytetrafluoroethylene fiber, polyurea fiber,
Examples include molded synthetic fibers such as elastomer fibers such as urethane. These fibers or fibrous materials can be used alone or in combination.

The sound absorbing material of the present invention can contain (A) a foam mainly having an open cell structure, and (B) a porous body. (A) Foams mainly having an open-cell structure include urethane, liquid rubber, polyethylene, polypropylene, EPT, CR and the like.
High sound absorption performance.

(B) Foams such as rubber, plastics and various polymers, powders and granules such as paper, fiber, wood, cork and the like, sand and pearlite are used alone or in combination with the porous body. What bonded and molded each particle can be used. These porous bodies have a structure in which voids generated between the bonded particles are easily communicated, and a sound absorbing effect is generated in the voids. Such a porous body, the particle size distribution of the granular material, the compression force at the time of molding, the type and amount of the binder and the like, to adjust the bonding strength between voids and particles,
Sound absorption performance can be set.

Next, the water supply or hot water supply pipe soundproof structure of the present invention will be described in more detail with reference to the drawings. FIG. 1 is a vertical cross-sectional view of a hot water supply pipe soundproof structure according to an example of the present invention. The hot water supply pipe soundproofing structure 27 is composed of a horizontal straight pipe 1, a deformed pipe 2 bent at an angle of 90 °, and a vertical straight pipe 3, and these pipes are joined to form a pipe soundproofing structure. 27. The outer circumference of the deformed pipe 2 is covered with a pipe soundproofing material 8 including a heat insulating material layer 4, a moistureproof material layer 5, a sound absorbing material layer 6, and a sound insulating material layer 7. Straight pipe 1 is deformed pipe 2
And a portion near the deformed portion adjacent to the second portion. In FIG. 1, a pipe sound-insulating material 13 including a heat-insulating material layer 9, a moisture-proofing material layer 10, a sound-absorbing material layer 11, and a sound-insulating material layer 12 is provided at a place where the outer circumference of the straight pipe 1 is not covered with the pipe soundproofing material 8. Coated.

The straight pipe 3 also has a portion near the deformed portion adjacent to the deformed pipe 2. In FIG. 1, in the vicinity of the deformed portion,
In the same position as the straight pipe 1, a heat insulating material layer 14, a moistureproof material layer 15,
Piping sound insulating material 18 including sound absorbing material layer 16 and sound insulating material layer 17
Is coated.

In the hot water supply pipe soundproof structure 27, the straight pipe 1
The water flowing in from the direction of depends on the flow rate and flow velocity,
The flowing direction in the deformed pipe 2 changes suddenly, generating vibrations in the piping, and flowing out in the direction of the straight pipe 3. The deformed pipe 2 is provided with a pipe soundproofing material 8, which can reduce an impact sound generated when flowing water changes direction. Also, in the hot water supply pipe soundproofing structure 27, the vicinity of the deformed part on the upper part of the straight pipe 1 is also provided.
A pipe soundproofing material 18 is provided. For this reason, the hot water supply pipe soundproof structure 27 can effectively reduce the impact noise generated by the collision of flowing water. Further, in the hot water supply pipe soundproofing structure 27, a pipe soundproofing material 13 is provided also in the vicinity of the deformed portion of the straight pipe 1. The pipe soundproofing material 13 can effectively reduce radiation sound, solid-borne sound, and transmitted sound of the pipe structure.

As described above, the range in which the pipe soundproofing material is provided is, assuming that the entire outer circumference of the deformed pipe and the inner diameter of the straight pipe are L, from the end of the deformed pipe toward the inflow side and the outflow side of the straight pipe. 3
The outer circumference of the straight pipe in the range from L to 9L is preferred. With a pipe soundproofing material having a length in this range, the obtained water or hot water supply pipe soundproofing structure exhibits an excellent noise prevention effect. If it is less than 3 L, if the water supply pressure or hot water supply pressure is high, neither vibration nor noise can be sufficiently reduced, and the noise prevention effect becomes insufficient. vice versa,
Even if the treatment exceeds 9 L, the noise prevention effect hardly changes, so that there is no point in spending time on materials and construction.

In the present invention, by covering the outer periphery of the water supply or hot water supply pipe with a predetermined pipe soundproofing material, the noise generation site is wrapped around and the pipe noise is reduced. More specifically, (1) the heat insulating material and the sound absorbing material are two types of layered spring materials, and the sound insulating material on the outer periphery thereof becomes an additional weight. Such a pipe soundproofing material reduces the vibration of the pipe by a vibration damping effect by dynamic vibration absorption. (2) The sound transmitted through the heat insulating material absorbs the sound energy by the sound absorbing material on the outer periphery thereof, and further rebounds to the sound absorbing material side by the sound insulating material on the outer periphery and is absorbed again by the sound absorbing material. It is divided into components that pass through and emit as sound. In this noise reduction effect, the thickness of the heat insulating layer and the thickness of the sound absorbing layer, which normally exhibit heat insulating performance, work effectively for absorbing noise, and increase the sound energy loss up to the sound insulating layer. Accordingly, the noise has such a low value that it cannot be obtained by the soundproof structure in which the pipe is directly covered with the sound absorbing layer and the sound insulating layer.

Next, the configuration of the pipe soundproofing material used for the water supply / hot water pipe soundproofing structure of the present invention will be described. It is desirable that such a pipe soundproofing material has good attachment properties during construction.
In the present invention, the sound absorbing material containing the bulky fiber described above is used as the sound absorbing material.

The sound insulating material is not limited to water supply or hot water supply piping.
What is generally applied to piping can be used. Examples of the sound insulating material include a sheet material and a lead sheet obtained by highly filling a polymer such as rubber or vinyl chloride with a high specific gravity filler. In particular, for a pipe such as a hot water supply pipe that is affected by temperature, a rubber-based sound insulating material that is particularly excellent in followability of expansion and contraction is preferable. In addition, such a sound insulating material is rarely provided directly on a pipe serving as a sound source or a vibration source. If the sound insulating material is provided at a position through a layer of a sound absorbing material or the like, a sufficient thickness up to the sound insulating layer can be obtained. Due to the synergistic effect of the materials, the soundproof performance of the pipe can be further improved.

When the temperature difference between the inside of the pipe and the surrounding area is remarkable, it is preferable to provide a heat insulating material on the outer periphery of the pipe. Such a heat insulator is intended to prevent freezing in winter in a water supply pipe, prevent dew condensation in high humidity, and maintain heat in a hot water pipe to prevent heat energy loss. Insulation for this purpose should be provided in the water or hot water supply pipe. However, in the present invention, any heat insulating material that achieves the above object can be used. In addition, if the outer periphery of the water supply or hot water supply pipe is covered with a heat insulating material and a sound absorbing material, a sound insulating material, and the like are added to the outer periphery, the obtained pipe soundproofing structure can most effectively prevent noise. Therefore, in the present invention, there is no particular limitation as the heat insulating material.

Examples of the heat insulating material include foams such as polyethylene, polypropylene, polystyrene, polyurethane, EPT, and CR, and inorganic fibers such as glass wool and rock wool. Further, they may be formed in a cylindrical shape, and may be formed by slitting one side of the cylinder, dividing the cylinder in half, or providing a moisture-proof material on the outer periphery.

As the heat insulating material of the hot water supply pipe, among foams such as polyethylene, polypropylene, polyurethane, EPT and CR, those having a high closed cell ratio are preferable. Such insulation is
A stacked structure of a plurality of materials may be used. Further, the hot water supply pipe may be a pipe with a heat insulating material.

In the present invention, a moisture-proof material can be used for water supply or hot water supply piping. In a water supply pipe, particularly when the temperature in the pipe is low and the surrounding environment is humid, condensation easily occurs on the pipe surface. In such a pipe, a material that is difficult to conduct heat, such as a heat insulating material or a sound absorbing material, is surrounded on the outer periphery of the pipe. However, in order to maintain the performance of the heat insulating material and the sound absorbing material for a long period of time, it is very difficult to use a moisture proof material in such a pipe. It is an effective means. As the moisture-proof material, for example, a film or sheet of aluminum foil, asphalt-impregnated paper, polyethylene, polypropylene, polyester, vinylidene chloride, vinyl chloride, or the like may be used alone or in combination. It should just be fixed to.

In addition, similar to the general pipe soundproofing process,
The butted portion of the pipe sound insulation material of the water supply or hot water supply pipe has a gap. This gap, if left as it is, causes sound leakage. In order to avoid such a situation, it is particularly effective to close the gap in the outermost layer with a joint tape or the like. For example, also in the water-supply or hot-water supply pipe soundproof structure, a tape-like material or a caulking agent protruding from the adhesive layer can be used alone or in combination.

In FIG. 1, around the hot water supply pipe soundproof structure 27,
In particular, a tape 20 is wound around the outer periphery of the boundary 19 between the pipe sound insulation 8 and the pipe sound insulation 13. Further, in the hot water supply pipe soundproofing structure 27, the tape 22 is also wound around the outer periphery of the joint between the pipe soundproofing material 8 and the pipe soundproofing material 18. Further, a tape 24 is wound so as to cover the end 23 of the pipe soundproofing material 13. A tape 26 is also wound around the end 25 of the pipe soundproofing material 18. In this way, if the joint part of the pipe soundproofing material is stuck to the joint tape with an adhesive layer, sound leakage can be prevented for a long time, and the pipe soundproofing material can be fixed without a gap for a long time.

The material of the joint tape may be the same as the material of the sound insulating material, but a thin material is sufficient. Also,
An appropriate tape width is 30 to 100 mm. Elongation is 1
00-200% is preferable. In addition, the adhesive layer of the tape
The adhesive layer of the same type of polymer as the tape material is good, and it is easy to integrate over time, so it can be used with confidence.

FIG. 2 is a cross-sectional view of the pipe soundproofing structure of FIG. 1 taken along the line AA. A heat insulating material layer 9 is provided on the outer periphery of the pipe 1, and a moisture-proof material layer 10 is provided on the outer periphery thereof.
A wrap layer 10 on the abutting portion 9a of the heat insulating material layer 9.
a. On its outer periphery, there is a sound absorbing material layer 11.
This sound absorbing material layer 11 contains hollow fibers and exhibits excellent restoring properties even with temperature changes. The sound insulating material layer 12 on the outer periphery of the sound absorbing material layer 11 has a wrap portion 12 a on the butted portion 11 a of the sound absorbing material layer 11 to prevent a gap. At the end of the sound insulating material layer 12, a tape 24 is wound.

FIG. 3 is a perspective view of a pipe soundproofing material which has been integrally molded in advance. The pipe sound insulating material 32 is a heat insulating material layer 2 from the pipe side.
8, a sound absorbing material layer 29 and a sound insulating material layer 30, and are laminated and integrated in a tubular shape. The pipe soundproofing material 32 has a butt portion 3 in which one portion of the cylinder is opened for attachment to a pipe.
One. The sound insulating material layer 30 has a wrap portion 30a so that there is no gap in the butted portion 31.

In the sound-insulating structure of the water supply or hot water supply pipe of the present invention,
It is preferable that a portion supported by the skeleton of the straight pipe portion is covered with a pipe soundproofing material and a fixing member made of a material having higher rigidity than the pipe soundproofing material. FIG. 4 is a cross-sectional view of the straight pipe supporting portion subjected to the coating process. In the support portion 44 of the straight pipe 33, the straight pipe 33
The outer periphery is a heat insulating material layer 34, a moisture proof material layer 35, a sound absorbing material layer 36,
The pipe sound-insulating material 38 comprising the sound-insulating material layer 37 is covered, and the outer periphery of the pipe sound-insulating material 38 is further covered by a fixing member 39 having higher rigidity than the pipe sound-insulating material. The support portion 44 is fixed to the fixing bracket 40 with a bolt 41 and further fixed to the frame 42 with an anchor bolt 43.

In such a soundproofing process of the pipe supporting portion, the pipe soundproofing material acts as a damping material by using the pipe and the rigid fixing member as a restraining material. If the circumference of the pipe is treated over a longer range, the pipe soundproofing material as a vibration damping material will be fixed in a longer section, forcibly suppressing the vibration of the pipe, reducing the vibration of the pipe itself, Vibration transmission to the part of the body to be fixed is also reduced, which is effective for preventing sound transmitted through the body.

It is preferable that the pipe of the support section is soundproofed at a length of 2 to 7 times the inner diameter of the pipe of the straight pipe section. If the support portion is treated in such a range, the noise of the water supply or hot water supply pipe can be most effectively prevented. More specifically, when the processing section is less than twice, the reduction in vibration is insufficient, which is not desirable. Conversely, when the processing section exceeds 7 times, the number of fixed parts between the skeleton and the piping increases, so that it takes time to process,
In terms of soundproofing performance, the effect of taking much time does not occur, and up to 7 times is sufficient.

The outer periphery of the water supply or hot water supply pipe supported by the frame can be covered with a pipe soundproofing material of the same quality as the pipe soundproofing material used for the above-mentioned deformed pipe portion and the vicinity of the deformed portion. Further, the outer periphery of the pipe soundproofing material of the support portion is covered with a fixing member having higher rigidity than the pipe soundproofing material. Such rigid materials include polymers such as styrene, phenol, epoxy, unsaturated polyester, polyethylene, polypropylene, vinyl chloride, and acrylic;
Metals such as iron, aluminum, copper, brass, and stainless steel can be used alone or in combination.

If the pipe is covered with such a pipe sound insulating material and a highly rigid member of the support section, the vibration of the pipe can be attenuated more quickly, and the vibration can hardly be transmitted to the frame on the fixed side of the support section. The length covering the pipe is the inner diameter L of the pipe.
On the other hand, 2L to 7L are preferable. It is not always effective to cover the entire outer periphery of the pipe other than the supporting portion with such a pipe soundproofing material. If you cover the piping of the support part in this range,
Vibration of the pipe can be sufficiently prevented from being transmitted to the skeleton.

[0055]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail based on embodiments with reference to the drawings. Example 1 A soundproof structure for a hot water supply pipe having a flow path shown in FIG. 5 having a deformed portion and a portion near the deformed portion as shown in FIG. 1 and a pipe support as shown in FIG. 4 was manufactured.

FIG. 5 is a schematic view showing the entire hot water supply pipe structure. This figure shows the piping structure suspended from the ceiling of the first floor and viewed obliquely from below. The pipe structure 54 includes a pipe pipe 45, a deformed section 46, and a pipe soundproofing material 49 covering the deformed section 46, the deformed section vicinity 47, and the support section 48 of the straight pipe, and a pipe support section 48. It consists of a fixing member 50 that covers the outer periphery of the soundproofing material. This piping structure 5
4 is fixed to the hanging bracket 52 with bolts 51 and the first floor ceiling 5
3 is hung.

The pipe structure 54 has six flow path changing portions, each of which is covered with a pipe soundproofing material 49 by a predetermined length. Joint 5 between pipe sound insulation materials 49
Joint tapes 57 are attached to both ends 56 of the pipe 5 and the pipe soundproofing material 49. In the support portion 48 of the straight pipe, the straight pipe 45
Are covered with a pipe soundproofing material, and both ends 58
Are treated with a joint tape 59 and fixed with a fixing member 50 made of a material having higher rigidity than the pipe soundproofing material.

The inflow side piping 60 at one end of the piping structure 54
Penetrates the ceiling 53 on the first floor, and the water
Inflows from. Outflow piping 61 at the other end of the piping structure 54
Also penetrates the first floor ceiling 53, and the inflowing water flows out from the pipe 61.

The hot water supply pipe has a nominal diameter 1 /
2 inches (outer diameter 15.88mm), inner diameter 14.86mm
Outer diameter of 47φm with heat insulation and moisture proof material integrated into the piping
m of piping was used.

In this soundproof structure of the hot water supply pipe, the heat insulating material integrated with the hot water supply pipe is a urethane foam, and the moisture proof material is a vinyl chloride film. Soundproofing was performed on this pipe. The treatment length was covered with the pipe soundproofing material from the point where the center line of the inflow-side straight pipe and the center line of the outflow-side straight pipe crossed each other to a length of 45 mm in the pipe axis direction in the pipe near the deformed portion. .
This coating distance is 3.0 times the inner diameter of the straight pipe. Further, in this piping structure, the outer circumference of the straight pipe of the pipe support portion was covered with a pipe soundproofing material with a length of 32 mm in the pipe axis direction.
This coating distance is 2.2 times as long as the inner diameter of the straight pipe.

As a pipe soundproofing material, a sound absorbing material was attached to the outer periphery of a pipe on which a heat insulating material and a moistureproof material were attached. As the sound absorbing material, a 5-mm-thick nonwoven fabric obtained by mixing 70% by weight of hollow polyester fibers and 30% by weight of solid polyester fibers was used. A sound insulating material was attached to the outer periphery of the sound absorbing material. This sound insulating material is a non-vulcanized butyl rubber sheet having an area density of 3.5 kg / m ² .

At the pipe support, after being treated with a pipe soundproofing material, a fixing member was attached. As this fixing member, 32
A 2 mm thick iron plate having a length of 2 mm was used. This fixing member was fixed to a fixing bracket with a bolt.

Abutting portions of notches at the inner corners of the pipe soundproofing material,
Both ends of the pipe soundproofing material and both ends of the pipe soundproofing material used for the pipe support portion were sealed with a butyl rubber-based joint tape stuck without gaps. The portion of only the joint tape protruding from both ends of the pipe soundproofing material is not included in the above-described soundproofing portion near the deformed portion.

Test Method FIG. 6 is a sectional view showing a noise measuring device having a pipe structure.
In this figure, the piping structure 54 described in detail in FIG. 5 is suspended from the floor slab body 62. The water supply is pumped from a tank 64 through a line 65 by a pump 63 to a water heater 70 where it is warmed and injected into a piping structure 54. This hot water circulates in the piping structure 54, returns to the tank 64 through the line 66.

The noise of the pipe structure is measured while continuously supplying hot water (supply water pressure is 9 kg / cm ² ). The sound generated at that time was caught by a microphone 67 installed on the first floor and sent from a precision sound level meter 68 to a frequency analyzer 69 for measurement.

The noise of the hot water supply pipe soundproof structure of this embodiment was measured. The results are summarized in Table 1.

Example 2 A hot water supply pipe soundproof structure was manufactured in the same manner as in Example 1 except that the length of the soundproofing process was changed from the pipe structure of Example 1. In the vicinity of the deformed portion, the treatment length was covered with a pipe soundproofing material from the end of the deformed pipe to a length of 120 mm in the pipe axis direction. This coating distance is 8.1 times the inner diameter of the straight pipe. Further, in this piping structure, the outer periphery of the straight pipe of the pipe support portion was covered with a pipe soundproofing material with a length of 100 mm in the pipe axis direction. This coating distance is 6.7 times as long as the inner diameter of the straight pipe. The noise of this hot water supply pipe soundproof structure was measured in the same manner as in Example 1. The results are summarized in Table 1.

Example 3 In the piping structure of Example 1, the type of the pipe soundproofing material was changed.
A hot water supply pipe soundproofing structure was manufactured in the same manner as in Example 1 except that the length of the soundproofing treatment was changed. 32% by weight of hollow polyester fiber, 68% by weight instead of the sound absorbing material used in Example 1.
7 mm thick non-woven fabric made of a mixed fiber of solid polypropylene fibers. 1.5kg surface density as sound insulation material
/ M ² of a non-vulcanized EPT / butyl rubber sheet, which was applied to the outer periphery of the nonwoven fabric. The length of the soundproofing process was 79 mm from the intersection of the center lines of the two types of straight pipes on the same basis as in Example 1.
A pipe soundproofing material was attached to the vicinity of the irregularly shaped portion having a length of 47 mm, and the pipe support was soundproofed to a length of 47 mm. The processing length in the vicinity of the deformed portion is 5.3 times the inner diameter of the straight pipe. The processing length of the pipe support is 3.2 times the inner diameter of the straight pipe. The noise of this hot water supply pipe soundproof structure was measured in the same manner as in Example 1. The results are summarized in Table 1.

Example 4 The sound-absorbing material used in Example 3 was a 7 mm fiber made of a mixed fiber of 27% by weight of hollow conjugate fiber (high shrinkage polyester / low shrinkage polyester) and 73% by weight of solid polypropylene fiber. A hot water supply pipe soundproofing structure was manufactured in the same manner as in Example 3 except that the nonwoven fabric was changed to a thick nonwoven fabric. The noise of this hot water supply pipe soundproof structure was measured in the same manner as in Example 1. The results are summarized in Table 1.

Example 5 The sound-absorbing material used in Example 3 was a 7 mm fiber made of a mixed fiber of 65% by weight of hollow conjugate fiber (high shrinkage polyester / low shrinkage polyester) and 35% by weight of solid polypropylene fiber. A hot water supply pipe soundproofing structure was manufactured in the same manner as in Example 3 except that the nonwoven fabric was changed to a thick nonwoven fabric. The noise of this hot water supply pipe soundproof structure was measured in the same manner as in Example 1. The results are summarized in Table 2.

COMPARATIVE EXAMPLE 1 A hot-water supply pipe structure was manufactured with the pipe, the heat insulating material and the moisture-proof material being integrated. The noise was measured in the same manner as in Example 1 for the hot water supply pipe structure thus manufactured. The results are summarized in Table 2.

Comparative Example 2 A pipe structure was manufactured in the same manner as in Example 3 except that the type of the pipe soundproofing material of Example 3 was changed and the length of the soundproofing treatment was partially changed. In this hot water supply piping structure, EPT is used as a sound absorbing material.
A 10 mm-thick foam mainly composed of open cells was applied.
On the outer periphery, a surface density of 1.5 kg / m ² as a sound insulating material
Butyl rubber sheet was applied. The book processing length in the vicinity of the deformed portion is 79 mm as in the third embodiment. However, the pipe support was soundproofed at a length of 30 mm. The processing length of the pipe support is 2.0 times the inner diameter of the straight pipe. Further, this support portion was fixed with a commercially available iron T-shaped band around the pipe soundproofing material at a length of 25 mm. Noise was measured in the same manner as in Example 1 also for the hot water supply pipe soundproof structure. The results are summarized in Table 2.

Comparative Example 3 The soundproofing material of Example 5 was changed to 100% by weight of solid nylon fiber having a thickness of 7 mm. All other conditions were the same as in Example 5. Table 2 summarizes the noise measurement results.

[0074]

[Table 1]

[0075]

[Table 2]

In the soundproof structure of the hot water supply pipe of the first embodiment, the sound of the hot water supply is 125 Hz as compared with the structure of the comparative example 1 in which only the hot water supply pipe is provided.
Any frequency is 5.4d in the above one octave band
B ~ 17.7dB can be improved and the noise level is 10.6dB
_{(A) It} can be improved and good results can be obtained.

In the hot water supply pipe soundproof structure of the second embodiment, the hot water supply noise can be improved by 5.7 dB to 18.9 dB at all frequencies and the noise level can be improved by 1 in comparison with the structure of Comparative Example 1 in which only the hot water supply pipe is provided.
2.4 dB _(A) Improved and good.

In the pipe soundproof structure of the third embodiment,
Compared with the structure of Comparative Example 1 using only the hot water supply pipe, the frequency is improved by 5.0 to 15.3 dB at a frequency of 125 Hz or more, and the noise level is improved by 9.6 dB _(A), which is excellent.

In the pipe soundproof structure of Embodiment 4, the sound of hot water supply is
Compared with the structure of Comparative Example 1 in which only the hot water supply pipe is provided, 4.9 to 14.9 dB is improved at each frequency of 125 Hz or more, and the noise level is also improved by 10.9 dB _(A), which is good.

In the pipe soundproof structure of the fifth embodiment,
Compared with the structure of Comparative Example 1 in which only the hot water supply pipe is used, 8.1 to 19.7 dB is improved at each frequency of 125 Hz or more, and the noise level is 13.2 dB _(A), which is good.

In the soundproof structure for piping of Comparative Example 2, the sound of hot water supply was
It is improved by 4.1 to 14.2 dB at each frequency of 125 Hz or more as compared with the structure of Comparative Example 1 in which only the hot water supply pipe is provided. However, the amount of improvement at 1000 Hz or more is worse than in Examples 1 to 5.

In the pipe soundproof structure of Comparative Example 3, the hot-water supply noise is improved by 4.5 to 14.1 dB at each frequency of 125 Hz or more compared with the structure of Comparative Example 1 in which only the hot-water supply pipe is provided. The noise level has been improved by 6.0 dB _(A), but 1000H
The improvement on the high frequency side above z is poor. Also, the noise level is improved width least 6.0 dB _(A), not in the following 40 dB _(A).

[0083]

The sound-absorbing material for piping of the present invention uses bulky fibers having excellent resilience, so that the sound-absorbing performance can be maintained even when subjected to a temperature change.

According to the water or hot water supply pipe soundproofing structure of the present invention, only the pipe soundproofing material is adhered to a predetermined range.
The noise of the water supply or hot water supply pipe can be reduced most effectively and economically quickly.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a hot water supply pipe soundproof structure according to the present invention.

FIG. 2 is a cross-sectional view of the pipe soundproofing structure of FIG. 1 taken along line AA.

FIG. 3 is a perspective view of a pipe soundproofing material that is integrally molded in advance.

FIG. 4 is a longitudinal sectional view of a pipe support.

FIG. 5 is a perspective view showing a test flow path of a water supply pipe.

FIG. 6 is a longitudinal sectional view of the noise measuring device.

[Explanation of symbols]

1,33 Horizontal straight pipe 2 90 ° bent deformed pipe 3 Vertical straight pipe 4,9,14,28,34 Heat insulating material layer 5,10,15,35 Moisture proof material layer 6,11,16,29, 36 sound-absorbing material layer 7, 12, 17, 30, 37 sound-insulating material layer 8, 13, 18, 38 pipe sound-insulating material 9a, 11a, 31 butt portion 10a, 11a, 31 lap portion 19, 21 joint of pipe sound-insulating material 20, 22, 24, 26, 57, 59 Joint tape 23, 25 End of pipe soundproofing material 27 Hot water supply pipe soundproofing structure 32 Integrated pipe soundproofing material 33 Straight pipe 39, 50 Fixing member 40 Fixing bracket 41, 51 Bolt 42 Body 43 Anchor bolt 44 Pipe support part 45 Straight pipe part 46 Deformed part 47 Near deformed part 48 Straight pipe support part 49 Pipe soundproofing material 52 Suspension fitting 53 First floor ceiling 54 Hot water supply pipe soundproof structure 55 Joining 56,58 piping acoustic insulation ends 60 inflow side pipe 62 Floor plate precursor 63 pump 64 tank 65, 66 line 67 Microphone 68 precision sound level meter 69 frequency analyzer 70 water heater of

Claims (7)

[Claims] 1. A sound absorbing material provided on an outer periphery of a pipe and reducing noise generated from the pipe, the pipe sound absorbing material including a fibrous material composed of an aggregate in which fibers are fixed to each other, A sound absorbing material for piping, wherein the fibers include bulky fibers, and a change in restorability due to a temperature change is suppressed in the sound absorbing material. 2. The method according to claim 1, wherein the bulky fiber is a hollow fiber, and the hollow fiber has a hole in a longitudinal direction.
The sound absorbing material for piping according to claim 1. 3. The bulky fiber is a conjugate fiber, and the conjugate fiber has a high shrinkage portion and a low shrinkage portion when viewed in cross section, and the high shrinkage portion and the low shrinkage portion are different from each other. The sound absorbing material for piping according to claim 1, wherein the conjugate fiber is shrunk by shrinking. 4. The sound absorbing device according to claim 3, wherein the high shrinkage portion is formed of a high shrinkage polymer, and the low shrinkage portion is formed of a low shrinkage polymer. Wood. 5. The sound-absorbing material for piping according to claim 3, wherein the high-shrinkage portion and the low-shrinkage portion are heat-treated to shrink, and the conjugate fiber is shrunk. 6. A water supply or hot water supply pipe soundproofing structure comprising a water supply or hot water supply pipe and a pipe soundproofing material, wherein noise generated from the pipes is reduced, wherein the pipes have a deformed portion and a deformed portion. An adjacent straight pipe portion, wherein the straight pipe portion includes a deformed portion adjacent portion adjacent to the deformed portion, and an outer periphery of the deformed portion and a pipe in the vicinity of the deformed portion, Water supply characterized by being covered with the pipe sound insulating material including the pipe sound absorbing material according to any one of (1) to (5), and reducing noise generated in the deformed portion and the vicinity of the deformed portion. Or hot water supply pipe soundproof structure. 7. A water supply or hot water supply pipe soundproofing structure comprising a water supply or hot water supply pipe and a pipe soundproofing material, wherein noise generated from the pipes is reduced, wherein the pipes have a deformed portion and the deformed portion. And a support portion supported by a skeleton, wherein the straight pipe portion includes a deformed portion adjacent portion adjacent to the deformed portion, and the deformed portion, the support portion An outer periphery of the pipe near the deformed portion is covered with the pipe soundproofing material including the pipe sound absorbing material according to any one of claims 1 to 5, and an outer circumference of the pipe soundproofing material of the support portion. Is covered with a fixing member made of a material having higher rigidity than the pipe soundproofing material, wherein the noise generated in the deformed portion, the support portion and the vicinity of the deformed portion is reduced, Hot water supply pipe soundproof structure.