JP5707170B2 - Sound insulation fireproof pipe and method for producing sound insulation fireproof pipe - Google Patents

Description

  The present invention relates to a sound insulation fireproof pipe having sound insulation and fire resistance used as a drain pipe, a water supply pipe, a ventilation pipe and the like in an apartment house such as a condominium or an office building, and a method for producing the sound insulation fireproof pipe.

In recent years, in apartment buildings and office buildings such as condominiums, inner pipes made of synthetic resin such as vinyl chloride and fiber reinforced mortar formed on the outer peripheral surface of the inner pipe as drainage pipes, water supply pipes, ventilation pipes, etc. A fire-resistant double-layer tube made of an outer tube made of non-combustible ceramics is used.
This refractory double-layer tube is characterized by being lighter in weight, less drainage noise, and less likely to condense outside, compared to a cast iron tube that is a conventional metal tube. In addition, the inner pipe made of synthetic resin is gradually and widely used because it is excellent in chemical resistance, corrosion resistance, inner surface smoothness and workability.
By the way, recently, many residents complain about drainage noise from downstairs residents, which is one of the major causes of neighborhood trouble. In particular, nighttime drainage noise has been highlighted as a serious problem.
Thus, since higher performance is required for drainage noise, an intermediate layer made of a material having sound absorption performance is formed between the inner tube and the outer tube as in the invention described in Patent Document 1. A fire-resistant three-layer pipe has been proposed.

JP 2001-74191 A

However, in the case of using felt, mat, blanket of inorganic fibers such as rock wool, glass wool, ceramic wool, etc. described in Patent Document 1 as a sound absorbing material, in order to sufficiently reduce noise due to drainage, It is necessary to make the thickness considerably thick (average 5 mm for rock wool, average 5 mm for glass wool, average 3 mm for ceramic wool), but a sufficient sound insulation effect is not always obtained.
In addition, it is conceivable to use a resin-based material as the sound absorbing material, but there is a problem that the fire resistance performance of the tube is lowered when the resin-based material is used.
Therefore, an object of the present invention is to provide a high sound insulation performance without increasing the thickness of the sound absorbing material by using a predetermined organic material in the gap between the synthetic resin inner tube and the nonflammable outer tube. And it is providing the manufacturing method of the sound insulation fireproof pipe which has the fireproof performance equivalent to the conventional fireproof double layer pipe, and a sound insulation fireproof pipe.

In the first aspect of the invention, the synthetic resin inner pipe, the nonflammable outer pipe covering the synthetic resin inner pipe with a predetermined gap, and the synthetic resin inner pipe and the nonflammable outer pipe are provided. A sound-absorbing material is disposed in the gap, and as the sound-absorbing material, a non-woven fabric of fibers in which an outer layer made of an ethylene vinyl copolymer resin (EVOH resin) is formed on the outer peripheral surface of a polyester fiber is used . With the overlapping portion formed by overlapping the end portions along the tube axis direction of the synthetic resin inner tube, the overlapping portion is disposed in the gap, and the width of the overlapping portion is 40 mm or less. To achieve the object.
The invention according to claim 2 is the invention according to claim 1, wherein the apparent density of the sound absorbing material is 30 kg / m ^{3 to} 500 kg / m ³ , and the thickness of the sound absorbing material is 1.5 mm to 2.5 mm. It is characterized by being.
According to a third aspect of the present invention, the object is achieved by providing a method for producing a soundproof fireproof tube according to the first or second aspect, comprising the following steps.
Step 1: A mortar layer is formed on the outer peripheral surface of the core tube having a size not less than 3 times and not more than 7 times the thickness of the sound-absorbing material at the outer diameter size of the synthetic resin inner tube, and is cured and cured. Then, a step of producing a nonflammable outer tube by pulling out the core tube Step 2: An ethylene vinyl copolymer resin (on the outer peripheral surface of the polyester fiber as a sound absorbing material on the outer peripheral surface of the synthetic resin inner tube ( A non-woven fabric of fibers formed with an outer layer made of EVOH resin) is formed so that the end portions of the sound absorbing material are overlapped along the tube axis direction of the synthetic resin inner tube so that the width of the overlapped portion is 40 mm or less. Step of coating the outer peripheral surface of the synthetic resin inner tube in a state where the synthetic resin inner tube is coated with the sound absorbing material obtained in step 2 and the non-combustible material obtained in step 1 Inserting into the outer tube

  According to the present invention, there is provided a soundproof fireproof tube that maintains a fireproof performance equivalent to that of a conventional fireproof double-layer tube and has improved sound insulation effect, despite using a synthetic resin material as a sound absorbing material. Can be obtained.

It is a side view of the sound insulation fireproof pipe which concerns on embodiment of this invention. It is sectional drawing of the AA 'direction of FIG. It is sectional drawing of the AA 'direction of FIG. 1 explaining the example which provided the overlapping part in the sound-absorbing material. It is the figure which showed the outline | summary of the measuring apparatus. It is the figure which showed the result of the fire resistance test.

Hereinafter, preferred embodiments of the soundproof fireproof pipe of the present invention will be described in detail with reference to FIGS. 1 to 5.
(1) Outline of Embodiment FIG. 1 is a side view of a soundproof fireproof pipe according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view in the AA ′ direction of FIG.
The sound insulation and fireproof pipe 10 includes a synthetic resin inner pipe 22, a nonflammable outer pipe 26 that covers the synthetic resin inner pipe 22 with a predetermined gap, and a synthetic resin inner pipe 22 and a nonflammable outer pipe. A sound absorbing material 24 having sound absorbing performance is arranged in the gap between the two. As the sound absorbing material 24, a non-woven fabric of fibers in which an outer layer made of ethylene vinyl copolymer resin (EVOH resin) is formed on the outer peripheral surface of a polyester fiber is used.
Since the width of the gap between the synthetic resin inner pipe 22 and the nonflammable outer pipe 26 is larger than the thickness of the sound absorbing material 24, the synthetic resin covered with the nonflammable outer pipe 26 and the sound absorbing material 24 at the time of construction is made. The inner tube 22 can be constructed by shifting in the direction of the arrow in the figure.
The sound insulation fireproof pipe 10 according to this embodiment can improve the sound insulation performance during drainage while maintaining the fireproof performance of the conventional fireproof double-layer pipe.

(2) Details of Embodiment Details of the soundproof fireproof pipe 10 shown in FIGS. 1 and 2 will be described.
First, the synthetic resin inner pipe 22 uses a synthetic resin pipe such as a hard vinyl chloride pipe defined in JIS-K-6741 and JIS-K-6742, as in the conventional fireproof double-layer pipe. In general, the inner diameter of the synthetic resin inner tube 22 is 20 mm to 150 mm in nominal dimensions (nominal diameter), and the thickness is 1.8 mm to 9.6 mm, depending on the nominal dimensions.

Next, the nonflammable outer tube 26 is a ceramic material, and is made of cement and reinforcing fibers as main raw materials, as in a general fireproof double-layer tube, and calcium carbonate powder, wollastonite, clay as required. Mineral admixtures, lightweight aggregates such as pearlite and synthetic calcium silicate hydrate, etc. are used as auxiliary materials. In addition, the pulverized powder of the outer tube which has become waste material can also be used as the admixture.
As the cement used for the nonflammable outer pipe 26, hydraulic cement such as Portland cement can be used. The proportion of cement in the raw material blend is preferably 50% by mass or more. If the blending ratio of the cement is less than 50% by mass, the strength of the nonflammable outer tube 26 may be insufficient.

As the reinforcing fibers, synthetic fibers such as cellulose pulp and vinylon fibers, and inorganic fibers such as glass fibers can be used. The blending ratio of this reinforcing fiber is preferably 3 to 10% by mass. If it is less than 3% by mass, the strength of the outer tube made of a ceramic noncombustible material may be insufficient. Moreover, when it exceeds 10 mass%, it may become difficult to disperse | distribute a reinforcement fiber uniformly in the wet mixing of the raw material mentioned later.
In addition, it is suitable that the blending ratio of organic fibers (cellulose pulp and synthetic fibers) in the reinforcing fibers is 7% by mass or less. If the blending ratio of the organic fibers exceeds 7% by mass, there is a risk that the fire resistance performance of the nonflammable outer tube 26 is lowered.
The admixture is a raw material used to improve the formability when producing the nonflammable outer tube 26 or to improve the physical properties such as heat resistance of the obtained nonflammable outer tube 26.
The lightweight aggregate is a raw material used to reduce the weight of the nonflammable outer tube 26. One or more auxiliary materials such as admixtures and lightweight aggregates can be used. The mixing ratio when using the auxiliary raw material is 40% by mass or less, preferably 33% by mass or less. In addition, although an auxiliary material does not necessarily need to be used, the mixture ratio in the case of using it is 5 mass% or more, Preferably it is 15 mass% or more, More preferably, it is 25 mass% or more. If the blending ratio of the auxiliary material is less than 5% by mass, a sufficient effect of the auxiliary material may not be obtained.

  Since the non-combustible outer tube 26 covers the synthetic resin inner tube 22, the weak point that the synthetic resin inner tube 22 is vulnerable to flame is compensated, and the fire spreads through the synthetic resin inner tube 22 in the event of a fire. To prevent it. In this embodiment, the sound absorbing material 24 is also effectively prevented from spreading.

Next, a method for manufacturing the nonflammable outer tube 26 will be described.
First, water is added to each of the above-described raw materials and wet-mixed, and then formed into a thin layer using a known method such as a papermaking method. And it winds up to predetermined | prescribed thickness on the outer periphery of the metal core pipe which has a predetermined | prescribed outer diameter (The outer diameter of an inner pipe is set to 2 times or more and 7 times or less of the thickness of a sound-absorbing material), 50 degreeC ~ Cured at 80 ° C. Then, the nonflammable outer tube 26 can be obtained by removing the core tube and further performing natural curing or the like.
The outer diameter (diameter) of the metal core tube is set to a size obtained by adding 2 to 7 times the thickness of the sound absorbing material 24 to the outer diameter (diameter) of the synthetic resin inner tube 22. If the thickness of the sound absorbing material is less than twice the thickness of the sound absorbing material, the synthetic resin inner tube 22 covered with the sound absorbing material is used as the nonflammable outer tube in the manufacturing process of inserting the synthetic resin inner tube 22 into the nonflammable outer tube 26. 26, or the sound absorbing material 24 may be drowned at the time of insertion, and if it exceeds 7 times the thickness of the sound absorbing material, the construction of the soundproof fireproof tube may be difficult. Therefore, when the outer diameter of the synthetic resin inner tube 22 is 114 mm and the thickness of the sound absorbing material 24 is 1.5 mm, the outer diameter of the metal core tube is 117 mm or more and 124.5 mm or less.
When the outer diameter of the metal core tube is set to a size obtained by adding twice the thickness of the sound absorbing material 24 to the outer diameter of the synthetic resin inner tube 22, the manufactured sound insulation fireproof tube 10 is made of synthetic resin. The gap between the inner tube 22 and the nonflammable outer tube 26 corresponds to the thickness of the sound absorbing material 24.

The incombustible outer tube 26 has an apparent density of about ^{0.8g / cm 3 ~1.6g / cm 3} . The non-combustible outer pipe used for general fireproof double-layer pipes differs depending on the nominal diameter of the inner pipe. When the nominal diameter of the inner pipe is 20 mm, the thickness is 5.5 mm, and the nominal diameter of the inner pipe is 150 mm. The thickness is about 7.5 mm. Also in this embodiment, fire resistance equivalent to that of a general fireproof double-layer tube can be obtained with the same thickness as that of a nonflammable outer tube used for a general fireproof double-layer tube.

Next, the sound absorbing material 24 used in this embodiment will be described.
Conventionally, felts, mats, and blankets of inorganic fibers such as rock wool, glass wool, and ceramic wool have been used as materials having sound absorbing performance. In the example in Patent Document 1, the thickness of the sound absorbing material is required to be at least 3 mm, and the thickness cannot always obtain sufficient sound insulation performance against drainage noise.
In addition to the inorganic material, a synthetic resin material has been used as the sound absorbing material.
Examples of such synthetic resin materials include polyethylene, polyurethane, polyethylene terephthalate, copolymer polyester, polypropylene, and other mixtures thereof, but even when these synthetic resin materials are used, The thickness of the sound absorbing material is required to be at least 3 mm, and with such a thickness, there is a possibility that sufficient sound insulation performance against drainage noise cannot be obtained. Moreover, when these synthetic resin-made sound-absorbing materials are used, there is a risk that the fire resistance is also lowered.

  Therefore, in this embodiment, as the sound absorbing material 24, a fiber nonwoven fabric in which an outer layer made of an ethylene vinyl copolymer resin (EVOH resin) is formed on the outer peripheral surface of a polyester fiber is used. Thereby, high sound insulation performance can be obtained without increasing the thickness of the sound absorbing material, and fire resistance performance that is the same as that of the conventional fireproof two-layer tube can be obtained even though the nonwoven fabric is made of synthetic resin.

Sound absorbing material used in this embodiment is preferably an apparent density of ^{30kg / m 3 ~500kg / m 3} . When the apparent density is less than 30 kg / m ³ , the sound insulation performance may be lowered. Moreover, when the apparent density exceeds 500 kg / m ³ , the sound insulation performance may be lowered.

In covering the synthetic resin inner tube 22 with the sound absorbing material 24, it is necessary to prevent a gap from being formed between the ends of the sound absorbing material 24. When the place where the synthetic resin inner pipe 22 is not covered with the sound absorbing material 24 is generated, the sound insulation performance is lowered. The ends of the sound absorbing material 24 covering the synthetic resin inner tube 22 are fastened with a tape or the like.
In the present embodiment, even if a flammable tape is used, the fireproof performance of the soundproof fireproof pipe described later does not deteriorate. Further, in order to prevent a gap from occurring between the end portions of the sound absorbing material 24, as shown in FIG. 3, by providing an overlapping portion 25 in which the end portions of the sound absorbing material 24 are overlapped, It can also be fastened with tape or the like so as not to create a gap between the ends. In this case, the width of the overlapping portion 25 is preferably 40 mm or less, although it depends on the outer diameter of the synthetic resin inner tube 22. If the width of the overlapped portion is 40 mm or less, the fireproof performance of the sound insulation fireproof tube 10 is not so much reduced even if there is an overlapped portion, but if it exceeds 40 mm, there is a risk that the fireproof performance of the soundproof fireproof tube 10 is lowered. is there.
When the overlapping portion 25 is provided, the inner diameter of the nonflammable outer tube 26 is a dimension obtained by adding 3 to 7 times the thickness of the sound absorbing material to the outer diameter of the synthetic resin inner tube 22. Is preferred. When the thickness of the sound absorbing material 24 is less than three times, when the synthetic resin inner tube 22 covered with the sound absorbing material 24 is inserted into the non-combustible outer tube 26 in the manufacturing process of the sound insulating fireproof tube 10, Due to the presence of the portion 25, it may be difficult to insert the sound absorbing material 24 or the sound absorbing material 24 may be rolled up during the insertion.
On the other hand, if it exceeds 7 times the thickness of the sound absorbing material 24, the construction of the sound insulation fireproof tube 10 may be difficult.
In the configuration in which the overlapping portion 25 is provided, the synthetic resin inner tube 22 covering the sound absorbing material 24 in the sound insulating fireproof tube 10 is eccentric, but if the width of the overlapping portion is 40 mm or less, there is a practical problem. There is no.

The thickness of the sound absorbing material 24 is desirably 1.5 mm to 2.5 mm. If the thickness exceeds 2.5 mm, the fireproof performance of the soundproof fireproof tube 10 may be reduced. On the other hand, the thinner the sound absorbing material 24 is, the better, but if it is less than 1.5 mm, it becomes difficult to obtain sufficient sound insulation performance against drainage noise.
In the case of a general fireproof two-layer pipe, it is manufactured by inserting the inner pipe into the outer pipe, and the inner pipe and the outer pipe are formed to be slidable. In the sound insulation fireproof tube 10 of the present embodiment, in order to provide the sound absorbing material 24 between the synthetic resin inner tube 22 and the nonflammable outer tube 26, the outer peripheral surface of the synthetic resin inner tube 22 is covered with the sound absorbing material 24. After that, it is manufactured by inserting it into the nonflammable outer tube 26.
The refractory double-layer pipe is configured so that it can be cut by sliding the outer pipe with respect to the inner pipe during construction. Also in the present embodiment in which the sound absorbing material 24 is provided, in the same manner as the fireproof double-layer tube, in order to adjust the length on site, the nonflammable outer tube 26 and the synthetic resin inner tube 22 covered with the sound absorbing material 24 Can be cut by sliding.
In addition, since the sound absorbing material 24 has a certain elasticity, even if the synthetic resin inner tube 22 expands when hot water or the like is drained after the fireproof sound insulation tube 10 is disposed, the expansion is continued. Can be absorbed without being transmitted to the nonflammable outer tube 26.

Next, specific examples of the present embodiment will be described. Based on Reference Example 1 and Reference Example 2, and Example 3 and Example 4, a sound insulation performance test and a fire resistance performance test were performed.
( Reference Example 1, Reference Example 2)
As the synthetic resin inner pipe 22, a hard vinyl chloride pipe having a nominal diameter of 100 mm (outer diameter 114 mm) and a thickness of 6.6 mm, which is frequently used as a drain pipe, was used. This was used for a sound insulation performance test described later (hereinafter referred to as Reference Example 1).
In addition, for the fire resistance test described later, in accordance with the principle that the test is performed with the largest outer diameter within the range where use is assumed, the largest outer diameter actually used, the nominal diameter is 150 mm (outer diameter A rigid vinyl chloride pipe having a dimension of 165 mm) and a thickness of 8.9 mm was used as the synthetic resin inner pipe 22 (hereinafter referred to as Reference Example 2).
The nonflammable outer tube 26 was made of 70% cement, 5% reinforcing fibers, and 25% inorganic admixture as raw materials.
Water is added to these raw materials and mixed to obtain a raw material slurry, and this raw material slurry is made into a thin layer with a paper making machine. In Reference Example 1, a core tube having an outer diameter (diameter) of 120 mm has a thickness of 6. A mortar layer is formed by winding a thin layer so as to be 5 mm, and in Reference Example 2, the mortar is wound around a core tube having an outer diameter of 171 mm so that the thickness is 7.5 mm. A layer was formed. Thereafter, after curing at 70 ° C. for 3 hours, the core tube was taken out and further naturally cured for one week to produce an incombustible outer tube 26 having an apparent density of 1.1 g / cm ³ .
The sound absorbing material 24 is a fiber nonwoven fabric in which an outer layer made of ethylene vinyl copolymer resin (EVOH resin) is formed on the outer peripheral surface of a polyester fiber, and the apparent density of Kureray Flexstar (registered trademark) is 65 kg / m. ³ with a thickness of 2 mm was used.
This non-woven fabric is manufactured by reacting instantaneously with special fibers by simultaneous action of steam heat and jet, and absorbs sound energy with fine fibers and void structure (especially high sound absorption performance in the mid-high range) It is characterized by.
A sound insulation fireproof tube 10 of this embodiment was manufactured by inserting a flexure, which is a sound absorbing material 24, on the outer peripheral surface of the synthetic resin inner tube 22 with a wrapping tape and then inserting it into a nonflammable outer tube 26. .
The thickness of the nonflammable outer tube 26 of the sound insulation fireproof tube 10 is 6.5 mm when the nominal diameter of the synthetic resin inner tube 22 is 100 mm, and 7 mm when the nominal diameter of the synthetic resin inner tube 22 is 150 mm. .5 mm.

(Example 3)
The same synthetic resin inner tube as in Reference Example 1 was used. The nonflammable outer tube was the same as Reference Example 1 except that a core tube having an outer diameter of 122 mm was used. The sound absorber also used the same flexor as in Reference Example 1. However, when covering the synthetic resin inner tube with the sound absorber, a tape was provided with an overlapping portion where the ends of the sound absorber were overlapped with a width of 30 mm. I stopped it. Next, a soundproof fireproof tube of Example 3 was manufactured by inserting a synthetic resin inner tube coated with a sound absorbing material into a nonflammable outer tube in the same manner as in Reference Example 1. Example 3 is for a sound insulation performance test described later.

Example 4
A soundproof fireproof tube was manufactured. The same synthetic resin inner tube as in Reference Example 2 was used. The nonflammable outer tube was the same as Reference Example 2 except that a core tube having an outer diameter of 173 mm was used. The same sound absorber as in Reference Example 2 was used as the sound absorbing material, but when covering the synthetic resin inner tube, an overlapping portion was formed by overlapping the ends of the sound absorbing material with a width of 30 mm and fastened with tape. . Next, a soundproof fireproof tube of Example 4 was manufactured by inserting a synthetic resin inner tube coated with a sound absorbing material into a nonflammable outer tube in the same manner as in Reference Example 2. The soundproof fireproof pipe of Example 4 is for fireproof performance test described later as in Reference Example 2.

(Comparative Example 1)
The same synthetic resin inner tube and non-flammable outer tube as in Reference Example 1 were used. The thickness of the sound absorbing material was the same as in the example. Polyethylene (apparent density was 46 kg / m ³ ) was used as the sound absorbing material.

(Comparative Example 2)
The same synthetic resin inner tube as in Reference Example 1 was used. Rock wool felt having an apparent density of 200 kg / m ³ was used as the sound absorbing material. In the case of rock wool felt, when the thickness was 2 mm, the inner tube could not be uniformly formed. Therefore, an outer tube having a thickness of 6.5 mm was manufactured in the same manner as in Reference Example 1 except that a core tube having an outer diameter of 124 mm was used, and a sound insulation fire-resistant tube having a sound absorbing material thickness of 4 mm was manufactured.

(Reference example)
A conventional refractory double-layer tube was used. The synthetic resin inner pipe is the same as that of the example, but the width of the gap between the nonflammable outer pipe (thickness 6.5 mm) and the synthetic resin inner pipe is 1 mm.

Next, the result of having measured the sound insulation performance of the products according to Examples, Comparative Examples, and Reference Examples is shown.
Here, the noise is a sound that is not desirable for human beings. If any sound is perceived as an unpleasant sound or a nuisance sound for a listener, the sound is regarded as noise. That is, noise is a sensory amount based on human hearing, and in order to express its magnitude, an amount based on human auditory sensation must be used instead of the physical volume of sound. Therefore, the sound pressure level obtained by frequency-weighting (A characteristic) according to an equal loudness curve to the sound pressure level of noise is used as an amount representing the magnitude of noise, and is set as “noise level” L _A (unit: dBA). The sound insulation performance of Reference Example 1, Example 3, Comparative Example 1, and Comparative Example 2 was evaluated based on the difference from the conventional fireproof two-layer pipe (reference example).

(Measuring method)
FIG. 4 is a diagram showing an outline of the measuring apparatus. As shown in the figure, a simple vertical pipe for the third floor is provided and drained from the third floor of the experimental facility to a test specimen in a pseudo pipe space (hereinafter referred to as a pseudo PS) installed on the second floor using a Western-style toilet. The sound pressure level was measured for 5 seconds with a precision sound level meter (NA-28) at a position 100 mm away from the outside of the test body. The drainage conditions were carried out at an average drainage flow rate of 2.6 liters / sec (assuming a flow rate for two Western-style toilets) by allowing approximately 9.5 liters of water to flow for 7 seconds. . In addition, the measurement was performed three times at each drainage flow rate, and the results were averaged to compare the specifications. Table 1 shows the test results.

As is clear from Table 1, Reference Example 1 and Example 3 were superior in sound insulation performance to sound insulation fire-resistant pipes using other materials as the sound absorbing material 24.

Next, the results of the fire resistance test will be described.
This fire resistance test is a flameproof test applied for evaluation related to the certification based on the provisions of Article 129-2-5, paragraph 1, item 7 c of the Building Standard Law Enforcement Ordinance.
The test method is a flame barrier test.
(I) Heating curve: heating curve according to IS0834 * T = 345log10 (8t + 1) +20
T = temperature (° C)
t = hours (minutes)
(Ii) Test time: 60 minutes (iii) Measurement The following (1) to (3) are visually observed for the presence or absence of occurrence of a flame on the non-heated surface and a crack through which the flame passes.
(1) There shall be no fire eruption that continues for more than 10 seconds to the non-heating side.
(2) There should be no flame that continues for more than 10 seconds on the non-heated side.
(3) There should be no cracks or other gaps or gaps through which the flame passes.
(Test specimen)
(I) Site: ALC (lightweight cellular concrete) wall penetration (fire prevention section of the wall)
(Ii) Specimen size: Thickness (75 mm) x length (2450 mm) x width (3200 mm)
(Iii) A soundproof fireproof pipe ( Reference Example 2) (Example 4) and a fireproof two-layer pipe (Reference Example) are inserted into the above test to perform a fireproof test.
(Judgment item)
(I) Presence / absence of a flame that continues for more than 10 seconds to the non-heating side (ii) Presence / absence of flame that continues for more than 10 seconds to the non-heating side (iii) Damages such as cracks and gaps through which the flame passes Presence

The results are shown in the table of FIG. As is clear from the results shown in FIG. 5, in all the determination items, the soundproof fireproof pipes according to Reference Example 2 and Example 4 have fireproof performance that is not different from the conventional fireproof double-layer pipe. .

10 Sound insulation fireproof pipe 22 Synthetic resin inner pipe 24 Sound absorbing material 25 Superposition part 26 Nonflammable outer pipe

Claims (3)

A sound absorbing material is disposed in the synthetic resin inner tube, the non-flammable outer tube covering the synthetic resin inner tube with a predetermined gap, and the gap between the synthetic resin inner tube and the non-flammable outer tube. And
As the sound absorbing material, using a non-woven fabric of fiber in which an outer layer made of an ethylene vinyl copolymer resin (EVOH resin) is formed on the outer peripheral surface of a polyester fiber ,
The sound absorbing material is disposed in the gap in a state in which an overlapping portion is formed in which ends thereof are overlapped along the tube axis direction of the synthetic resin inner tube,
A soundproof fireproof tube characterized in that a width of the overlapping portion is 40 mm or less .
The apparent density of the sound absorbing material is ^{30kg / m 3 ~500kg / m 3} , sound insulation refractory tube as claimed in claim 1 in which the thickness of the sound absorbing material characterized in that it is a 1.5 mm to 2.5 mm.
The manufacturing method of the sound insulation fireproof pipe according to claim 1 or 2 , comprising the following steps.
Step 1: A mortar layer is formed on the outer peripheral surface of the core tube having a size not less than 3 times and not more than 7 times the thickness of the sound-absorbing material at the outer diameter size of the synthetic resin inner tube, and is cured and cured. Then, a step of producing a nonflammable outer tube by pulling out the core tube Step 2: An ethylene vinyl copolymer resin (on the outer peripheral surface of the polyester fiber as a sound absorbing material on the outer peripheral surface of the synthetic resin inner tube ( A non-woven fabric of fibers formed with an outer layer made of EVOH resin) is formed so that the end portions of the sound absorbing material are overlapped along the tube axis direction of the synthetic resin inner tube so that the width of the overlapped portion is 40 mm or less. Step of coating the outer peripheral surface of the synthetic resin inner tube in a state where the synthetic resin inner tube is coated with the sound absorbing material obtained in step 2 and the non-combustible material obtained in step 1 Inserting into the outer tube

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