JP4970110B2 - Manufacturing method of fireproof double-layer pipe - Google Patents

Description

  The present invention relates to a method for producing a refractory double-layer pipe comprising a synthetic resin inner pipe and a mortar outer pipe installed on the outer periphery thereof.

  Conventionally, in buildings and apartment houses, a fireproof double-layer pipe in which a mortar outer pipe is slidable on the outer periphery of a synthetic resin inner pipe is used for drainage. This fire-resistant double-layer pipe is made of mortar and has fire resistance and heat insulation properties, so it is possible to prevent the fire from spreading through the inner pipe made of synthetic resin in the event of a fire. . However, when drainage flows through the inner pipe made of synthetic resin, there is a problem that the drainage sound leaks from the fireproof two-layer pipe, in order to solve the problem of drainage sound and to provide further fire resistance and heat insulation. In addition, various fireproof two-layer pipes having a structure in which a heat insulating layer, a soundproof layer, a sound absorbing layer, and the like are provided between an inner pipe made of synthetic resin and an outer pipe made of mortar have been proposed.

  For example, Patent Document 1 has an inner pipe made of a resin material through which drainage flows, and a mortar made of a refractory pipe covering the inner pipe, and an outer pipe made of a cement inorganic material. A sound absorbing layer formed of felt is provided outside the inner tube, and a sound insulating layer formed by adding an asphalt material to a rubber-based material is provided outside the sound absorbing layer. Disclosed is a soundproofing pipe for drainage of building equipment having a function of preventing pipe vibration during drainage, wherein a soundproofing layer comprising two layers of the sound absorbing layer and the sound insulating layer is provided between the outer pipe and the outer pipe. Yes.

  Patent Document 2 discloses that a fiber-mixed mortar outer tube mounted on the outer periphery of a synthetic resin-made inner tube constituting a fireproof double-layered tube has a sound insulation and a mortar sheet made of uncured fiber-mixed mortar. A soundproof double-layered pipe for a fire-resistant double-layer pipe, characterized in that it is composed of a hollow cylindrical outer tube in which a multilayer sheet with a plurality of resin sheets stacked is wound into a hollow cylindrical shape and the outer surface and inner surface of the resin sheet are covered with a mortar sheet Pipe (Claim 1); The outer surface and the inner surface of the resin sheet are subjected to a joining process that enables joining with the mortar sheet. (Claim 2); The length in the winding direction of the resin sheet has a length that makes at least one round of the outer tube, and the length in the winding direction of the mortar sheet is longer than the length in the winding direction of the resin sheet. Too long The sound insulation type outer pipe for fireproof double-layer pipes according to claim 1, further comprising a sealing allowance for burying the front and rear ends of the resin sheet in the mortar before and after the filling direction (Claim 3); A layered sheet is formed by stacking a sound-insulating resin sheet on a mortar sheet made of fiber-mixed mortar, and this layered sheet is wound around a cylindrical shaft so that the outer surface and inner surface of the resin sheet are covered by the mortar sheet A method for producing a sound-insulated outer tube for a fire-resistant double-layer tube, wherein the cylindrical tube is dried and cured, and the cylindrical shaft is extracted to produce the outer tube (Claim 4); The start side mortar sheet is provided with a winding allowance of a length that makes at least one round of the cylindrical shaft, and is wound around the cylindrical shaft from the start side end portion with the surface on the resin sheet side inward. Method for producing a refractory bilayer pipe sound insulation form outside tube according to claim 4 (claim 5) is disclosed.

Japanese Patent No. 3156661 JP 2006-84016 A

Here, when connecting and constructing the fireproof two-layer pipes, the length of the heat insulation / sound absorbing layer and the outer pipe is longer than the length of the inner pipe because a connecting member for connecting the inner pipe made of synthetic resin is installed. It is necessary to shorten the length. However, in the soundproofing pipe material for drainage as disclosed in Patent Document 1, since the outer pipe and the soundproofing layer are not integrated, when cutting in construction, the outer pipe and the inner pipe are slid. If it does, since a soundproof layer will also move, there exists a problem that it is difficult to construct.
Moreover, since the sound insulation type outer pipe for fireproof double-layer pipes disclosed in Patent Document 2 is configured in such a manner that the inner pipe and the outer pipe are slidable, the workability is good. It is composed of at least three layers consisting of a resin sheet and a mortar sheet laminated on both sides thereof. In order to obtain a predetermined strength as a mortar outer tube, it is necessary to increase the thickness of each mortar layer. There is a problem that the mass becomes heavier than that of an outer tube made of a single layer mortar sheet.

  Accordingly, an object of the present invention is to provide a method for producing a fire-resistant double-layer pipe having sufficient fire resistance / heat insulation properties and sound absorption properties and good workability.

  That is, the method for producing a fire-resistant double-layer pipe according to the present invention comprises a fire-resistant construction comprising an inner pipe made of synthetic resin and an outer pipe made of mortar that is installed on the outer periphery of the inner pipe so as to be slidable in the length direction. In the two-layer pipe manufacturing method, heat insulation / sound absorbing material for heat insulation / sound absorbing layer formation is placed on the endless felt of a paper making device for making a mortar film for forming a mortar layer, and the paper making device is operated. The heat insulation / sound absorbing material was formed on the metal core tube placed in contact with the endless felt of the paper making apparatus by further winding the heat insulation / sound absorbing material, and then the paper was made on the outer peripheral surface of the heat insulation / sound absorption layer. The mortar film is wound up to a predetermined thickness to form a heat insulating / sound absorbing layer and a mortar layer, and then the metal core tube on which the heat insulating / sound absorbing layer and the mortar layer are formed is removed from the paper making apparatus and cured / cured. After the metal core By pulling out the, integrally molded and mortar made outer tube and heat insulation and sound absorption layer made of mortar layer, the interior of the resulting molded body, characterized by inserting the inner tube.

  In addition, the method for manufacturing a fireproof double-layer pipe according to the present invention includes a fireproof composed of a synthetic resin inner pipe and a mortar outer pipe installed on the outer periphery of the inner pipe so as to be slidable in the length direction. In the two-layer pipe manufacturing method, heat insulation / sound absorbing material for heat insulation / sound absorbing layer formation is placed on the endless felt of the paper making machine for making mortar film for forming mortar outer tube, and the paper making machine is operated. Then, a heat insulation / sound absorbing material was formed on the inner pipe placed in contact with the endless felt of the paper making apparatus by further winding up the heat insulating / sound absorbing material, and then the paper was made on the outer peripheral surface of the heat insulating / sound absorbing layer. The mortar film is wound up to a predetermined thickness to form a heat-insulating / sound-absorbing layer and a mortar layer, and then the inner tube on which the heat-insulating / sound-absorbing layer and the mortar layer are formed is removed from the paper making apparatus and cured / cured. By mortar Characterized by integrally molding a mortar made outer tube and heat insulation and sound absorption layer made of.

  Furthermore, the method for manufacturing a fireproof double-layer pipe according to the present invention comprises a fireproof composed of a synthetic resin inner pipe and a mortar outer pipe installed on the outer periphery of the inner pipe so as to be slidable in the length direction. In a two-layer pipe manufacturing method, a heat insulating / sound absorbing material for forming a heat insulating / sound absorbing layer is wound around the outer peripheral surface of the inner pipe to form a heat insulating / sound absorbing layer, and then a mortar film for forming a mortar outer pipe is made. Placed in contact with the endless felt of the paper making apparatus, and operated the paper making apparatus to wind up the mortar film made on the outer peripheral surface of the heat insulating and sound absorbing layer to a predetermined thickness to form a mortar layer, Next, the inner tube on which the heat insulating / sound absorbing layer and the mortar layer are formed is removed from the paper making apparatus and cured / cured to integrally form a mortar outer tube made of the mortar layer and the heat insulating / sound absorbing layer. To do.

  Moreover, the manufacturing method of the fireproof two-layer pipe | tube of this invention arrange | positions a net-like sheet | seat in the surface which contact | connects the mortar layer of a fireproof and sound absorption layer, It is characterized by the above-mentioned.

  Furthermore, the method for producing a fire-resistant double-layered pipe according to the present invention is characterized in that the fire-resistant and heat-insulating layer is composed of an inorganic fiber felt or mat or a polyester fiber mat.

  In addition, the method for producing a fireproof double-layer pipe according to the present invention has a metal film affixed to one side of an inorganic fiber felt or mat or a polyester fiber mat, and is insulated and sound-absorbed so that the metal film contacts the inner pipe. A layer is formed.

  Moreover, the manufacturing method of the fireproof two-layer pipe | tube of this invention is characterized by a metal film being aluminum foil.

  According to the manufacturing method of the present invention, the fireproof / sound absorbing layer and the outer tube made of mortar are integrated, and the fireproof / sound absorbing layer and the outer tube are configured to be slidable with the inner tube made of synthetic resin. A two-layer pipe can be obtained, and the obtained fire-resistant two-layer pipe has sufficient fire resistance / heat insulation properties and sound absorption properties, and has an effect of having good workability.

  According to a first aspect of the present invention, there is provided a method for producing a fireproof double-layer pipe, comprising: a heat insulating and sound absorbing material for forming a heat insulating and sound absorbing layer on an endless felt of a paper making apparatus for making a mortar film for forming a mortar layer. And then operating the papermaking device to form a heat insulating / sound absorbing layer by further winding up the heat insulating / sound absorbing material on the metal core tube placed in contact with the endless felt of the paper making device. A metal core tube having a heat insulating / sound absorbing layer and a mortar layer formed by winding up the mortar film made on the outer peripheral surface of the sound absorbing layer to a predetermined thickness, and then forming the heat insulating / sound absorbing layer and the mortar layer. Is removed from the paper making machine, cured and hardened, and then the metal core tube is pulled out to integrally form the mortar outer tube composed of the mortar layer and the heat insulating / sound absorbing layer. Insert the inner tube It is an aspect of the configuration and.

  Moreover, the method for producing a refractory double-layer pipe according to the second aspect of the present invention comprises a heat insulation / sound absorbing layer forming heat insulation / sound absorbing layer on an endless felt of a paper making apparatus for making a mortar film for forming a mortar outer pipe. Place the sound-absorbing material, operate the papermaking device, form a heat-insulating / sound-absorbing layer by winding the heat-insulating / sound-absorbing material further on the inner tube placed in contact with the endless felt of the paper making device, The inner tube on which the mortar film made on the outer peripheral surface of the heat insulating / sound absorbing layer is wound up to a predetermined thickness to form a heat insulating / sound absorbing layer and a mortar layer, and then the heat insulating / sound absorbing layer and the mortar layer are formed. Is removed from the paper making apparatus, and cured and hardened to integrally form a mortar outer tube made of a mortar layer and a heat insulating and sound absorbing layer.

  Furthermore, in the method for manufacturing a fireproof double-layer pipe according to the third aspect of the present invention, the heat insulating / sound absorbing material for forming a heat insulating / sound absorbing layer is wound around the outer peripheral surface of the inner pipe to form the heat insulating / sound absorbing layer, and then the mortar Place the mortar film on the outer surface of the heat insulation / sound absorbing layer with a predetermined thickness by placing it in contact with the endless felt of the paper making machine for making the outer tube forming mortar film. The inner tube on which the mortar layer is formed by winding up to the next, and then removing the inner tube on which the heat insulation / sound absorbing layer and the mortar layer are formed from the paper making apparatus, curing and curing, the mortar outer tube composed of the mortar layer and the heat insulation / It is a structural feature that the sound absorbing layer is integrally formed.

  Here, in the first to third inventions of the present invention, the synthetic resin pipe constituting the inner pipe is not particularly limited as long as it is a material normally used as a drain pipe for building equipment. For example, a vinyl chloride pipe, a heat-resistant hard vinyl chloride pipe, a recycled foamed three-layer hard vinyl chloride pipe, or the like can be used.

  In the first to third inventions of the present invention, the heat insulating / sound absorbing material for forming the heat insulating / sound absorbing layer is not particularly limited as long as it is a material having heat insulating properties, sound absorbing properties and elasticity. An inorganic fiber felt or mat such as glass wool or rock wool or a polyester fiber mat is preferably used.

  If a metal film is attached to at least one surface of the heat insulating and sound absorbing material so that the metal film and the inner tube are in contact with each other, the inner molded body in which the outer tube made of mortar and the heat insulating and sound absorbing layer are integrally formed and the inner This is preferable because the sliding property with the tube is improved.

  Here, an aluminum foil can be suitably used as the metal film. When the metal film is attached to at least one surface of the heat insulating / sound absorbing layer, for example, a glass with a metal film (for example, an aluminum foil) is used. The cloth can be made into a heat insulating and sound absorbing material by bonding the surface of the glass cloth opposite to the metal film with inorganic fibers such as glass wool or rock wool.

When glass wool is used as the heat insulating and sound absorbing material, its bulk density is in the range of 10 to 96 kg / m ³ , preferably 24 to 32 kg / m ³ . Moreover, when using rock wool, the bulk density is in the range of 25 to 300 kg / m ³ , preferably 40 to 200 kg / m ³ . Further, when a polyester fiber mat is used, its bulk density is in the range of 10 to 96 kg / m ³ , preferably 24 to 32 kg / m ³ . Here, when the bulk density exceeds the above upper limit, the material becomes hard and is not preferable because it is difficult to form a cylindrical shape. When the bulk density is less than the above lower limit, deformation due to the mass of the inner tube or fire-resistant double-layer pipe This is not preferable because the strength when sliding the outer tube and the inner tube made of mortar is insufficient. The thickness of the heat insulating / sound absorbing material is in the range of 5 to 50 mm, preferably 10 to 30 mm. Here, if the thickness exceeds 50 mm, the cross-sectional area of the refractory double-layer tube becomes too large as the thickness increases, or the mass of the mortar outer tube becomes too large, and the thickness is 5 mm. If it is less than 1, it is not preferable because sufficient heat insulation / sound absorption effect cannot be obtained.

  In the first to third inventions of the present invention, the mortar film for forming the mortar layer is formed by papermaking, but the papermaking method of the mortar film is not particularly limited. A method, a round net type papermaking method, or the like can be used. For example, when using the flow-on papermaking method, the metal core tube is dropped from the upper surface side of the endless felt between a pair of rolls provided on the lower surface side of the endless felt of the papermaking device, and is tightened by the pair of rolls. Since it is disposed in contact with the endless felt in a state, the metal core tube rotates with the operation of the endless felt. The raw slurry for forming the mortar film on the upper surface of the endless felt is supplied while operating the endless felt, and the mortar film is formed by suction dehydration from the lower surface of the endless felt. After winding up to a thickness to form a mortar layer, the operation of the endless felt is stopped, and the metal core tube with the mortar layer formed is taken out by releasing the tightening of the metal core tube by the pair of rolls. In addition, a new metal core tube is arranged.

  A raw material slurry for making a mortar film for forming a mortar outer pipe is mainly composed of cement and fibers. Here, as the cement, in addition to ordinary Portland cement, early-strength cement, low heat cement, intermediate heat Portland cement, and the like can be used. The amount of cement in the total solid content raw material is 30 to 90% by mass, preferably 50 to 80% by mass, and particularly preferably 55 to 75% by mass. As the fiber, wood pulp, glass fiber, synthetic organic fiber (polyvinyl alcohol, acrylic, rayon, aramid, etc.), magnesium silicate inorganic fiber (excluding asbestos) and the like can be used alone or in combination. . The amount of fibers in the total solid content is 2 to 15% by mass, preferably 3 to 10% by mass, and particularly preferably 4 to 8% by mass. In the raw material slurry for forming the outer tube made of mortar, in addition to the cement and fibers, powders such as calcium carbonate, wollastonite, perlite, mullite, etc. are used as a filler in the total solids raw material 5-40. It can mix | blend in the range of the mass%, Preferably it is 8-30 mass%, Most preferably, it is 10-20 mass%. In addition, by mix | blending a filler, the crack by the drying shrinkage | contraction of a mortar outer tube | pipe can be prevented, or heat resistance can be improved. A raw material slurry can be prepared by adding water to the solid content. Here, the solid content concentration in the raw slurry is in the range of 5 to 20% by mass, preferably 8 to 15% by mass, and more preferably 9 to 12% by mass.

  The thickness of the mortar layer obtained by laminating mortar films is in the range of 5 to 15 mm, usually 6 to 7.5 mm. When the mortar layer is formed directly on the outer circumference of the inner tube, the mortar layer shrinks due to the curing of the mortar layer and the drying performed as necessary after curing, so the slidability of the mortar outer tube and the inner tube is reduced. Damaged and difficult to install fireproof double-layer pipes. Therefore, in the first invention of the present invention, a mortar layer is formed using a metal core tube having a diameter in consideration of the shrinkage amount of the mortar layer, and the inner tube is inserted into the obtained mortar outer tube to form a two-layer fireproof layer. Manufacture tubes.

  In addition, in order to make it easy to integrate a mortar layer and a heat insulation and a sound absorption layer between a mortar layer and a heat insulation and a sound absorption layer, a mesh sheet can be installed. As the mesh sheet, for example, a polypropylene mesh sheet [for example, trade name Nisseki Conweed Net (manufactured by Nippon Steel Plast)] or the like can be used. In addition, for the same purpose, it is possible to apply a process for providing irregularities or the like to the surface in contact with the mortar layer of the heat insulating and sound absorbing material.

  In the first invention of the present invention, since the metal core tube is disposed in contact with the endless felt, while the operation of the endless felt is stopped, the metal core tube corresponds to the outer periphery of the metal core tube. A heat insulating and sound absorbing material having a length to be mounted is placed. When the raw slurry for forming a mortar film on the upper surface of the endless felt is supplied while the endless felt is in operation, first, the heat insulation / sound absorbing material is wound further on the outer peripheral surface of the metal core tube, and the heat insulation / sound absorption A layer is formed, and a mortar layer is formed on the outer peripheral surface by winding a mortar film until a predetermined thickness is obtained.

  The second invention of the present invention is the same as the first invention except that instead of the metal core tube of the first invention, an inner tube made of synthetic resin is placed in contact with the endless felt. As described above, the mortar layer shrinks due to curing and drying as necessary after curing, so if the outer mortar tube is formed directly on the inner tube, the slidability between the outer mortar tube and the inner tube is impaired. However, in the second invention of the present invention, a heat insulating and sound absorbing layer having elasticity is provided between the mortar outer tube and the inner tube, and the mortar outer tube and the heat insulating and sound absorbing layer are integrated. On the other hand, since the heat insulating / sound absorbing layer and the inner tube are slidable, the slidability of the mortar outer tube and the inner tube can be ensured.

  In the third invention of the present invention, instead of the metal core tube, the structure uses an inner tube in which a heat insulating / sound absorbing material is wound around the inner tube in advance to form a heat insulating / sound absorbing layer. Similarly, the slidability of the mortar outer tube and the inner tube can be ensured.

  The fireproof double-layered tube obtained as described above has a heat insulating / sound absorbing tube and an outer tube made of mortar fixed, and the heat insulating / sound absorbing tube and the inner tube can be configured to be slidable. Workability can be imparted.

The method for producing a fireproof double-layered tube of the present invention will be further described with reference to the following examples.
Example 1 (first invention)
When a flow-on papermaking machine is used as the mortar outer pipe manufacturing equipment and a metal core pipe (outer diameter: 166.3 mm) is placed in contact with the endless felt of the papermaking equipment, it is used to form a heat insulating and sound absorbing layer. A glass wool mat (bulk density: 24 kg / m ³ , dimensions: 515 × 2000 mm, thickness: 25 mm) is placed on the endless felt of the paper making apparatus. Next, the endless felt is operated, and the raw material for forming the outer tube made of mortar is 72% by mass of cement, 9% by mass of calcium carbonate and 8% by mass of pearlite as filler, and magnesium silicate inorganic fiber (asbestos) as the fiber raw material. The raw material slurry (solid content concentration: 10% by mass) prepared by adding 6% by mass and 5% by mass of wood pulp and adding water to the raw material was mixed on the upper surface of the endless felt, and the lower surface side of the endless felt The mortar film was formed by suction dehydration. First, a glass wool mat was wound around a metal core tube to form a heat insulating / sound absorbing layer, and a mortar layer was formed by winding a mortar film on the outer peripheral surface of the heat insulating / sound absorbing layer to a predetermined thickness. At that time, the operation of the endless felt was stopped, the metal core tube wound with the mortar layer and the heat insulating / sound absorbing layer was removed, and after the primary steam curing at 70 ° C. for 1.5 hours, the metal core tube was removed. An integrally molded body having an outer diameter of 183 mm, an inner diameter of 114 mm, and a length of 2000 mm, in which a heat insulating and sound absorbing layer was integrally formed on the inner periphery of the outer tube made of mortar, was obtained. An inner tube made of vinyl chloride having an outer diameter of 114 mm, an inner diameter of 100 mm, and a length of 2100 mm was inserted into the obtained integrally molded body and dried by natural curing for 2 weeks to obtain a fire-resistant double-layer tube.
The obtained fireproof two-layer pipe was in a state in which the outer pipe made of mortar and the inner pipe were slidable, and had good workability.

Example 2 (second invention)
In Example 1, instead of a metal core tube, an inner tube made of vinyl chloride (outer diameter: 114 mm, inner diameter: 100 mm, length: 2100 mm) was arranged in contact with the endless felt of the papermaking apparatus. In the same manner as above, when the heat insulating / sound absorbing layer is formed on the inner pipe and the mortar layer is formed on the outer peripheral surface thereof, the operation of the endless felt is stopped and the mortar layer and the heat insulating / sound absorbing layer are wound up. The tube was removed and subjected to primary steam curing at 70 ° C. for 1.5 hours and then dried by natural curing for 2 weeks to obtain a fire-resistant double-layer tube.
The obtained fireproof two-layer pipe was in a state in which the outer pipe made of mortar and the inner pipe were slidable, and had good workability.

Example 3 (third invention)
As the heat insulating / sound absorbing material for forming the heat insulating / sound absorbing layer, the glass wool mat used in Example 1 with an aluminum foil attached to one side is used, and the aluminum foil is brought into contact with the outer peripheral surface of the inner tube made of vinyl chloride. Let it wind. The papermaking apparatus of Example 1 was used as the papermaking apparatus, and the inner tube around which the glass wool mat was wound was placed in contact with the endless felt of the papermaking apparatus instead of the metal core tube of Example 1. Next, the endless felt was operated, and the raw material slurry of Example 1 was supplied onto the upper surface of the endless felt in the same manner as in Example 1. The mortar film was formed by suction dehydration from the lower surface of the endless felt, and the glass wool mat was wound. When the mortar layer is formed by winding the inner tube to a predetermined thickness, the operation of the endless felt is stopped, the inner tube wound with the mortar layer and the heat insulating / sound absorbing layer is removed, and natural curing is performed. Dried for a week to produce a fireproof double-layer tube.
The obtained fireproof two-layer pipe was in a state in which the outer pipe made of mortar and the inner pipe were slidable, and had good workability.

Example 4
In Example 1, when a glass wool mat having an aluminum foil attached on one side is placed on the endless felt of the papermaking apparatus so that the aluminum foil is on the upper surface, a polypropylene mesh sheet is placed between the endless felt and the glass wool mat. A fire-resistant double-layer tube was produced in the same manner as in Example 1 except that an integral molded body was produced by placing them in between.
The obtained fireproof two-layer pipe was in a state in which the outer pipe made of mortar and the inner pipe were slidable, and had good workability.

Conventional Example A flow-on papermaking apparatus is used as a manufacturing apparatus for a mortar outer pipe, and a metal core pipe is disposed in contact with an endless felt of the papermaking apparatus. Next, the endless felt is operated, the same raw material slurry as in Example 1 is supplied onto the upper surface of the endless felt, and sucked and dehydrated from the lower surface of the endless felt to form a mortar film, and the metal core tube has a predetermined thickness. When the wound mortar layer is formed, the operation of the endless felt is stopped, the metal core tube wound with the mortar layer is removed, and after the primary curing at 70 ° C. for 1.5 hours, the metal core tube Was extracted to obtain a mortar outer tube having an outer diameter of 129 mm, an inner diameter of 116 mm, and a length of 2000 mm. A vinyl chloride inner tube having an outer diameter of 114 mm, an inner diameter of 100 mm, and a length of 2100 mm was inserted into the obtained mortar outer tube and dried for 2 weeks by natural curing to obtain a fire-resistant two-layer tube. .

Next, the sound insulation property comparison test was done about the fireproof two-layer pipe | tube of this invention obtained in Example 1, and the conventional product.
In the sound insulation comparison test, a reverberation room used for a sound insulation performance test was used in a sound insulation wall of an apartment house. FIG. 1 shows a schematic diagram of a test facility used for a sound insulation comparison test.
A concrete wall (3) having a thickness of 200 mm is provided between the sound source room and the sound receiving room of the reverberation room. The concrete wall (3) is provided with a through hole (hole diameter: 200 mm) for passing a fireproof double-layer pipe (1) as a test body. Through this through-hole, a fire-resistant double-layer tube (1) having a length of 2000 mm was inserted so that the inner tube (vinyl chloride tube) (2) was exposed to the 100 mm sound source chamber side. Oil clay (6) was packed in the gap between the through hole of the concrete wall and the fireproof double-layer pipe so that no sound leaked. Moreover, the speaker (4) was installed in the inner tube (2) at the end of the fireproof double-layer tube (1) on the sound source room side so as to emit sound inside the fireproof double-layer tube (1). A sound-absorbing material (material: glass wool) (5) is packed at the end of the sound-receiving chamber side of the fire-resistant double-layer tube, a cap is attached, and the joint is filled with oil clay (6). The end of the layer tube (1) was sealed.
The microphone (7) was installed on the concrete outer pipe of the fireproof double-layer pipe in the vicinity of the concrete wall (3) on the sound receiving room side and at an interval of 300 mm from the concrete wall (3). Sound pressure level emitted from the speaker (4) on the sound source room side into the fireproof double-layer tube (1) and the inside of the fireproof double-layer tube (1) measured at each microphone installation point (measurement point) on the sound receiving room side Measure the sound pressure level of the air-propagating sound that leaks through the pipe wall of the fireproof double-layer pipe (1) and average the measured value at each measurement point as the sound pressure level. The difference of the sound insulation performance by the manufacturing method of the fireproof double-layer pipe was measured by the difference. The sound pressure level difference at each center frequency is as follows.

Center frequency (Hz) 125 250 500 1000 2000 4000
Sound pressure level difference product of the present invention 79 76 80 85 85 87
(DB) Conventional product 74 72 73 72 64 54

  The fireproof two-layer pipe of the present invention can be suitably used as a drain pipe for buildings and apartment houses.

It is the schematic of the test facility used for the sound-insulation comparison test.

Explanation of symbols

1 Fireproof double-layer tube, 2 Inner tube (vinyl chloride tube), 3 Concrete wall, 4 Speaker, 5 Sound absorbing material, 6 Oil clay, 7 Microphone

Claims (7)

  A mortar for forming a mortar layer in a method for producing a refractory double-layer pipe comprising a synthetic resin inner pipe and a mortar outer pipe installed on the outer circumference of the inner pipe so as to be slidable in the longitudinal direction A metal that is placed in contact with the endless felt of the papermaking machine by placing the heat insulation / sound absorbing material for forming a heat insulation and sound absorbing layer on the endless felt of the papermaking machine for making the film. A heat insulating / sound absorbing material is further wound around the core tube to form a heat insulating / sound absorbing layer, and then the mortar film made on the outer peripheral surface of the heat insulating / sound absorbing layer is wound up to a predetermined thickness to be insulated.・ Mortar is formed by forming a sound absorbing layer and a mortar layer, then removing the metal core tube on which the heat insulating / sound absorbing layer and mortar layer are formed from the paper making apparatus, curing and curing, and then pulling out the metal core tube. From layer That a mortar made outer tube and heat insulation and sound absorption layer integrally formed in the interior of the resulting molded body, method for manufacturing a refractory bilayer tube, characterized by inserting the inner tube.   A mortar for forming a mortar layer in a method for producing a refractory double-layer pipe comprising a synthetic resin inner pipe and a mortar outer pipe installed on the outer circumference of the inner pipe so as to be slidable in the longitudinal direction The heat insulation / sound absorbing material for heat insulation / sound absorbing layer formation is placed on the endless felt of the paper making machine for making the film, and the paper making machine is operated and placed in contact with the endless felt of the paper making machine. A heat insulating / sound absorbing layer is wound around the tube to form a heat insulating / sound absorbing layer, and then the mortar film made on the outer peripheral surface of the heat insulating / sound absorbing layer is wound up to a predetermined thickness to heat / sound absorbing sound. Forming a mortar layer and a mortar layer, and then removing the inner tube on which the heat insulation / sound absorbing layer and mortar layer are formed from the paper making apparatus and curing / curing, thereby forming a mortar outer tube comprising the mortar layer and a heat insulation / sound absorption layer. The Method for producing a refractory bilayer tubes, characterized in that the body molding.   In a method for producing a fireproof double-layer pipe comprising a synthetic resin inner pipe and a mortar outer pipe installed on the outer circumference of the inner pipe so as to be slidable in the longitudinal direction, on the outer circumference of the inner pipe A heat insulating / sound absorbing material for wrapping a heat insulating / sound absorbing layer is wound around to form a heat insulating / sound absorbing layer, and then placed in contact with an endless felt of a paper making apparatus for making a mortar film for forming a mortar layer. The mortar film made on the outer peripheral surface of the heat insulation / sound absorbing layer is wound up to a predetermined thickness by forming a mortar layer, and then the inner tube on which the heat insulation / sound absorbing layer and the mortar layer are formed A method for producing a refractory double-layer pipe, wherein a mortar outer pipe composed of a mortar layer and a heat insulation / sound absorbing layer are integrally formed by removing from the paper making apparatus, curing and curing.   The method for producing a fireproof double-layered tube according to any one of claims 1 to 3, wherein a mesh sheet is disposed on a surface of the fireproof / sound absorbing layer in contact with the mortar layer.   The method for producing a fire-resistant double-layer pipe according to any one of claims 1 to 4, wherein the fire-resistant and heat-insulating layer is composed of felt or mat made of inorganic fibers or a mat of polyester fibers.   6. A refractory layer according to claim 5, wherein a metal film is attached to one side of an inorganic fiber felt or mat or a polyester fiber mat, and a heat insulating and sound absorbing layer is formed so that the metal film is in contact with the inner tube. A method for manufacturing a laminar tube. Metal film is an aluminum foil, a manufacturing method of the refractory bilayer tube according to claim 6 Symbol mounting.

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