JP6063663B2 - Refractory double-layer tube and method for producing the same - Google Patents

Description

  The present invention relates to a fireproof double-layer pipe used as a drainage or ventilation pipe in a building such as an apartment house and a method for manufacturing the same.

  In buildings where many people live, such as apartment buildings and office buildings, the outer peripheral surface of the inner pipe made of synthetic resin, steel, cast iron, etc., is used as a drainage or ventilation pipe, etc. A refractory double-layer tube coated with is used. The structure and fire resistance of fire-resistant double-layer pipes are determined by standards and administrative guidance based on the Building Standards Act and the Fire Service Act for the purpose of preventing the spread of fire to adjacent sections through piping in the event of a fire.

  In such a fireproof two-layer tube, the material and forming method of the coating layer are improved in order to improve not only fire resistance but also soundproofing and heat insulation.

  For example, a fireproof double-layer tube shown in Patent Document 1 includes an inner tube made of synthetic resin, and a cladding tube (outer tube) that is provided on the outer peripheral surface of the inner tube and is formed of a nonwoven fabric. The part is impregnated with a refractory material such as mortar. Of the cladding tube, the outer part impregnated with mortar is configured as a sound insulation / fireproof layer, and the inner part not impregnated with mortar is configured as a sound absorbing layer.

  When manufacturing such a fireproof two-layer pipe, a nonwoven fabric is wound around an inner pipe or the like, and only the outer portion of the nonwoven fabric layer is impregnated with mortar.

JP 2011-21617 A

  In the conventional fireproof two-layer pipe shown in the above-mentioned Patent Document 1, when impregnating a woven mortar with a non-woven fabric layer, the amount of mortar impregnated is usually confirmed by visual observation, for example. However, in the past, it was difficult to determine the suitability of the mortar impregnation amount. For example, a troublesome measurement operation such as measuring the mortar impregnation amount using a measuring instrument such as a ruler (straight scale) was performed. Sometimes it was necessary. Thus, since it is difficult to judge the suitability of the mortar impregnation amount, the fire resistance performance of the fireproof two-layer pipe varies, and it may be difficult to obtain a high-quality fireproof two-layer pipe.

  The present invention has been made in view of the above problems, and can provide a high-quality fire-resistant two-layer pipe having excellent fire resistance performance and a method for producing the same, by appropriately adjusting the amount of impregnation of the fire-resistant material such as mortar. The purpose is to provide.

  In order to solve the above problems, the present invention comprises the following means.

[1] A fireproof two-layer pipe comprising an inner tube, a sound absorbing layer provided on the outer periphery of the inner tube, and a fireproof layer provided on the outer periphery of the sound absorbing layer,
The sound absorbing layer is constituted by a sound absorbing layer porous sheet,
The refractory layer is constituted by a porous sheet for a refractory layer impregnated with a refractory material,
The fireproof double-layer tube according to claim 1, wherein the sound absorbing layer porous sheet has a different color from the fireproof layer porous sheet.

  [2] The fireproof double-layer tube according to the above item 1, wherein only one side of the sound absorbing layer porous sheet and the fireproof layer porous sheet is colored.

  [3] The fireproof double-layer tube according to item 1 or 2, wherein the sound absorbing layer porous sheet and the fire resistant layer porous sheet are made of a nonwoven fabric.

[4] A tube, a sound absorbing layer porous sheet provided on the outer periphery of the tube, and a sound absorbing layer porous sheet provided on the outer periphery of the sound absorbing layer porous sheet and having a different color from the sound absorbing layer porous sheet. Preparing a tubular composite member comprising a fireproof layer porous sheet having
Impregnating the refractory layer porous sheet in the tubular composite member with a refractory material,
A fire-resistant double-layer tube having the sound-absorbing layer porous sheet as a sound-absorbing layer and the fire-resistant layer porous sheet impregnated with a fire-resistant material as a fire-resistant layer is obtained. Production method.

  [5] The method for producing a fire-resistant double-layer pipe according to item 4, wherein an inner pipe that is a constituent member of the fire-resistant double-layer pipe is used as the tubular body of the tubular composite member.

[6] As a tubular body of the tubular composite member, a core tube which is a support member in the manufacturing process of the fireproof two-layer tube is used.
After performing the step of impregnating with a refractory material, the core tube is extracted from the tubular composite member to obtain a cladding tube, and the cladding tube is externally fitted to an inner tube which is a constituent member of the fireproof two-layer tube. The manufacturing method of the fire-resistant two-layer pipe | tube of previous clause 4.

  According to the fireproof double-layer tube of the invention [1], the porous sheet for the sound absorbing layer and the color of the sheet for the fireproof layer are made different from each other, so that both the porous sheets can be easily distinguished visually. For this reason, when impregnated with a refractory material, it is possible to accurately grasp to what position of which porous sheet the refractory material has been impregnated, so it is easy and accurate to determine whether or not the amount of impregnation of the refractory material is appropriate. Can be judged. Therefore, stable fire resistance performance can be obtained reliably and high quality can be obtained.

  According to the fireproof double-layer tube of the invention [2], the color treatment is applied only to one of the porous sheets, and therefore the other porous sheet needs to be subjected to the color treatment. It can be easily manufactured.

  According to the fireproof double-layer tube of the invention [3], the above-mentioned effect can be obtained more reliably.

  According to the method for producing a fireproof double-layer pipe of the invention [4] to [6], a fireproof double-layer pipe having the above-described effects can be obtained with certainty.

FIG. 1 is a perspective view showing a fireproof double-layer pipe according to an embodiment of the present invention with a part thereof cut away. FIG. 2 is a cross-sectional view showing the fireproof double-layer tube of the embodiment.

  FIG. 1 is a perspective view showing a fireproof double-layer pipe 1 according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing the fireproof double-layer pipe 1 according to the embodiment.

  As shown in both figures, the fireproof double-layer tube 1 includes an inner tube 2 and a cladding tube 3 laminated on the outer peripheral surface of the inner tube 2. The cladding tube 3 includes two layers, a sound absorbing layer 31 disposed on the inner peripheral side and a fireproof layer 32 disposed on the outer peripheral side. And the fireproof layer 32 is comprised by the porous sheet 42 for fireproof layers impregnated with the fireproof material. Furthermore, the sound absorbing layer 31 is composed of a sound absorbing layer porous sheet 41 that is not impregnated with a refractory material (not impregnated with a refractory material).

  In the fireproof two-layer pipe 1 of the present embodiment, the inner pipe 2 can be made of any material such as a synthetic resin pipe, a steel pipe, or a cast iron pipe. Suitable examples of the synthetic resin pipes include thermoplastic resin pipes such as rigid polyvinyl chloride pipes (PVC pipes), polyethylene terephthalate pipes (PET pipes), and polypropylene pipes (PP pipes). In the present invention, the dimensions and the tube shape of the inner tube 2 are not limited. For example, a straight tube shape, a bent tube shape, a branched tube shape, or the like can be used.

  The porous sheet 42 for a refractory layer disposed outside the cladding tube 3 becomes a base material for retaining the refractory material when impregnated with the refractory material. After the refractory material is cured, the refractory layer 32 is provided. Therefore, in order to impregnate a sufficient refractory material, it is required that a large number of pores exist three-dimensionally (three-dimensionally) and have a required thickness. Specifically, a nonwoven fabric (including felt) formed by binding or entanglement of fibers, or open-cell foam can be recommended. In the present invention, as the porous sheet 42, a woven fabric or a knitted fabric can be used as long as it has a required thickness and can hold a refractory material.

  Non-woven fabrics can be uniformly impregnated with refractory materials evenly because the fibers are randomly oriented, and the strength against tension and bending is three-dimensionally uniform, so they are excellent in impact resistance and hard to break. A refractory layer 32 can be formed. The material of the fiber used as the material for the nonwoven fabric may be either organic or inorganic. Examples of organic fibers include polyester, polyethylene terephthalate (PET polyester), polyamide (6-nylon, 6,6 nylon, etc.), acrylic, polyvinyl alcohol (vinylon, etc.), polyolefin, cotton, wool, etc. it can. Examples of the inorganic fiber include glass fiber, rock wool, and ceramic fiber. Among these, inorganic fibers are preferable from the viewpoint of improving fire resistance, but it is preferable to use a nonwoven fabric made of synthetic fibers such as polyester and polypropylene from the viewpoint of cost and ease of handling. Since the fireproof performance of the fireproof layer 32 is sufficiently obtained by the fireproof material impregnated in the nonwoven fabric, there is no inconvenience even if a nonwoven fabric made of synthetic fibers is used.

  The nonwoven fabric can be used as it is, but it is preferable to use a felt obtained by compressing a nonwoven fabric, a needle punched nonwoven fabric or a felt. Since the nonwoven fabric has improved shape retention by being compressed or needle punched, the shape retention after impregnation with the refractory material is also improved, and as a result, the roundness of the refractory double-layer tube 1 can be increased.

  Examples of the open cell foam include foamed urethane foam and the like, and a high-strength fireproof layer 32 can be formed by impregnating a fireproof material in the foam as in the case of the nonwoven fabric.

  Among the fireproof layer porous sheets 42, the nonwoven fabric is most excellent in the reinforcing effect.

  On the other hand, as the sound absorbing layer porous sheet 41 constituting the inner sound absorbing layer 31 in the cladding tube 3, the material is preferably the same type as the above fire resistant layer porous sheet 42 constituting the fire resistant layer 32. Can be used.

  In the present embodiment, the sound absorbing layer porous sheet 41 has a different color from the fire resistant layer porous sheet 42 not impregnated with the fire resistant material.

  In this embodiment, the case where the colors are different means that the three attributes of the color, that is, the hue which is a difference in the color appearance such as red, yellow, green, and blue, and the saturation (including light and shade) which means the vividness of the color. ), At least one of the lightness values representing the brightness of the colors is different.

  Moreover, in this embodiment, when coloring the raw material of the porous sheets 41 and 42, the coloring method is not specifically limited, A well-known coloring method is employable. For example, a method of coloring a porous sheet material using a pigment-based paint or a dye-based paint can be employed.

  Furthermore, in this embodiment, not only the case where the color of the raw material itself of the porous sheets 41 and 42 is different, but also the case where the color is additionally made different is included. For example, in the present embodiment, the porous sheets 41 and 42 are mixed with a coloring additive such as a colored fiber (waste thread), so that the porous sheets 41 and 42 are colored, so that both porous The case where the colors are different between the quality sheets 41 and 42 is also included.

  In short, in this embodiment, when the porous sheets 41 and 42 can be distinguished from each other by visual judgment, the colors of the porous sheets 41 and 42 are different from each other. .

  In the present embodiment, both the porous sheets 41 and 42 may be colored in different colors, but only one of the two porous sheets 41 and 42 is colored and the both porous sheets 41 and 42 are colored. The colors may be different between 41 and 42. That is, only one of the porous sheets 41 and 42 is colored, and the remaining one is not colored but uses the original color of the material as it is. Thus, when coloring only one porous sheet, it is not necessary to perform a coloring process on the remaining one (the other) porous sheet, and the coloring process can be reduced. 42, and thus the fireproof double-layer tube 1 can be easily manufactured.

  For reference, in this embodiment, the sound absorbing layer porous sheet 41 is set to white, and the fireproof layer porous sheet 42 is set to gray, and only the fireproof layer porous sheet 42 side is colored. We are processing.

  In the present embodiment, the thickness of the cladding tube 3 (the sum of the thickness of the fireproof layer 32 and the thickness of the sound absorbing layer 31) is adjusted according to the required fireproof performance. Usually, the total thickness is preferably 3 to 30 mm.

  In the present embodiment, the density of the fireproof layer porous sheet 42 is preferably set lower than the density of the sound absorbing layer porous sheet 41. That is, since the fireproof layer porous sheet 42 is impregnated with a fireproof material to form the fireproof layer 32, the fireproof layer porous sheet 42 to be impregnated with the fireproof material is replaced with a low-density nonwoven fabric or the like. The sound absorbing layer porous sheet 41 that is configured by a low-density layer and does not want to be impregnated with a refractory material is configured by a high-density layer such as a non-woven fabric having a high density. Since the low density layer is more easily impregnated with the refractory material than the high density layer, only the low density fire resistant layer porous sheet 42 can be impregnated with the refractory material reliably. Thus, by using the porous sheets 41 and 42 of the low density layer and the high density layer, the impregnation degree of the refractory material can be accurately controlled, and the refractory layer 32 and the sound absorbing layer 31 can be accurately applied to desired portions. Can be formed.

  In this embodiment, the refractory layer 32 is formed by impregnating the refractory layer porous sheet 42 with a refractory material, as described above. The impregnation method of the refractory material is not particularly limited, and methods such as coating, pouring, spraying, and immersion can be used. Whichever impregnation method is used, the entire perimeter of the fireproof layer porous sheet 42 can be impregnated uniformly. Therefore, the refractory layer 32 having a uniform thickness can be formed over the entire circumference, and the high-quality refractory layer 32 having a high roundness can be formed.

  As the refractory material, mortar, in particular, cement-based mortar is preferably employed from the viewpoints of strength and density after curing, fire resistance, and the like. Examples of the cement used in the cement-based mortar include, for example, various ordinary Portland cements such as early strength, moderate heat, and very early strength, or blast furnace cement obtained by mixing fly ash and blast furnace slag with these Portland cements. Also, aggregates and various additives can be appropriately mixed with them. Water is mixed with these solid materials and impregnated into the porous sheet 42 for the fireproof layer as a wet material. The viscosity of the refractory material in the wet state is adjusted by the mixing ratio of the solid material and water, and is appropriately set according to the material, surface density, thickness, penetration rate, curing time, etc. of the porous sheets 41 and 42. In general, fiber mortar in which fibers are mixed with cement for the purpose of improving strength is used. However, the fireproof layer 32 of the present invention functions as a reinforcing material because the porous sheet for fireproof layer functions as a reinforcing material. There is no need to mix. Since the fiber mortar may hinder the penetration into the porous sheet for fireproof layer 42, it is preferable not to mix the fibers.

  The refractory layer 32 uniformly contains the fibers and resin constituting the refractory layer porous sheet 42 in the refractory material, and the fibers and resin function as a reinforcing material. For this reason, the refractory layer 32 has characteristics such as high strength, excellent impact resistance, and resistance to cracking.

  The thickness of the refractory layer 32 may be appropriately set according to the thickness of the cladding tube 3 (total thickness of the sound absorbing layer 31 and the refractory layer 32), the purpose of use, the construction location, and the like. As the fireproof layer 32 is thicker, fire resistance is improved, but there is also a problem of weight, and it is preferable to set the thickness to at least 3 mm, preferably about 5 mm to 10 mm. If the refractory layer 32 is made too thick, the weight of the entire refractory double-layer tube 1 increases, which may make transport and construction difficult.

  The sound absorbing layer 31 is constituted by a sound absorbing layer porous sheet 41 that is not impregnated with a refractory material. The sound absorbing layer 31 is preferably set to a thickness of at least 1 mm or more, preferably about 3 mm to 15 mm in order to ensure good sound absorption.

  In the present embodiment, the sound absorbing layer porous sheet 41 and the refractory layer porous sheet 42 are configured by separate members that are not physically connected, but the present invention is not limited thereto. The sound absorbing layer porous sheet 41 and the refractory layer porous sheet 42 may be formed of the same (one) porous sheet. That is, a thick porous sheet is wound around the outer periphery of the inner tube 2, and only the outer half of the porous sheet is impregnated with the refractory material. And while forming the outer peripheral part impregnated with the refractory material among the thick porous sheet as the refractory layer, the inner peripheral part not impregnated with the refractory material can be configured as the sound absorbing layer.

  The fireproof double-layer pipe 1 of the present embodiment configured as described above is used as, for example, a drain pipe of an apartment. In this case, the sound generated by the water flowing inside (water flow sound) is absorbed by the sound absorbing layer 31, and the water flow sound that has passed through the sound absorbing layer 31 is sound-insulated and reflected by the fireproof layer 32. Therefore, water flow sound does not leak out of the pipe. Furthermore, a predetermined fire resistance performance can be reliably obtained by the fire resistance layer 32 provided on the outer peripheral surface of the sound absorbing layer 31.

  In the present embodiment, the fireproof double-layer tube 1 can be manufactured, for example, by the following method.

  First, the sound absorbing layer porous sheet 41 is wound around the outer peripheral surface of the inner tube 2, and then the fire resistant layer porous sheet 42 that is not impregnated with the refractory material is wound around the sound absorbing layer porous sheet 41. Thus, the tubular composite member 10 in which the porous sheets 41 and 42 are provided on the outer peripheral surface of the inner tube 2 is manufactured. In the present embodiment, the inner tube 2 in the tubular composite member 10 constitutes a tubular body.

  Here, in the tubular composite member 10 of the present embodiment, the sound absorbing layer porous sheet 41 and the refractory layer porous sheet 42 are different in color, so the individual thicknesses of the porous sheets 41 and 42 ( Radial size), boundary lines between both porous sheets 41, 42, boundary positions, and the like can be accurately grasped visually. Therefore, the worker can impregnate the amount of the refractory material, such as how far the refractory material is impregnated in the next step of impregnating the refractory material, 32) and the difference in thickness, balance, etc. between the non-impregnated sound absorbing layer formation scheduled portion (sound absorbing layer 31) can be accurately predicted in advance. Therefore, the operator can accurately determine the amount of impregnation of the refractory material and whether or not the thickness of the sound absorbing layer 31 and the refractory layer 32 is appropriate before impregnating the refractory material. In some cases, it is possible to prevent improper products from being sent to the next process by repairing or correcting them in advance. Thereby, yield can be improved and product quality can be improved.

 After checking the boundary position between the porous sheets 41 and 42 in the tubular composite member 10 and the thicknesses of the sheets 41 and 42 and the like, if there is no abnormality, the porous sheet 42 for the fireproof layer of the tubular composite member 10 is used. For example, the refractory material is impregnated by spraying the refractory material from its outer peripheral surface. As a result, the fireproof two-layer tube 1 is obtained in which the fireproof layer porous sheet 42 impregnated with the fireproof material is used as the fireproof layer 32, and the sound absorbing porous sheet 41 not impregnated with the fireproof material is used as the sound absorbing layer 31. Is.

  Here, in the fireproof double-layer tube 1 of the present embodiment, since the sound absorbing layer porous sheet 41 and the fireproof layer porous sheet 42 have different colors, is the impregnation amount of the fireproof material appropriate? It is possible to easily and accurately determine whether or not.

  That is, since the porous sheets 41 and 42 can be clearly distinguished by color coding, when impregnated with a refractory material, if the actual impregnation amount is smaller than the ideal impregnation amount, Then, it can be confirmed accurately that a region not impregnated with the refractory material exists in the porous sheet 42 for the refractory layer that should be impregnated with the refractory material. Accordingly, the operator can easily and accurately determine that the amount of impregnation of the refractory material is insufficient. On the contrary, when the actual impregnation amount is larger than the ideal impregnation amount, the sound absorbing layer porous sheet 41 that is originally impregnated with the refractory material is impregnated with the refractory material. Can be confirmed accurately. Therefore, the operator can easily and accurately determine that the amount of impregnation of the refractory material is excessive.

  Thus, since it is possible to easily and accurately determine whether or not the amount of impregnation of the refractory material is appropriate, the thickness of the refractory layer 32 and the sound absorbing layer 31 can be accurately adjusted to a desired thickness, and the refractory performance and sound absorbing performance can be adjusted. It is possible to reliably obtain a high-quality fireproof double-layer pipe 1 excellent in

  In the present invention, as described below, after the cladding tube 4 is manufactured, the cladding tube 4 may be externally fitted to the inner tube 2.

  That is, in this manufacturing method, a core tube is used as a support member that supports the intermediate product of the refractory double-layer tube 1 in the manufacturing process. This core tube corresponds to the inner tube 2 which is a constituent member of the fireproof double-layer tube 1, and has an outer diameter equal to the outer diameter of the inner tube 2.

  A sound absorbing layer porous sheet 41 and a refractory layer porous sheet 42 are sequentially wound around the outer peripheral surface of the core tube. Thus, the tubular composite member 10 in which the porous sheets 41 and 42 are provided on the outer peripheral surface of the core tube is manufactured. In this modification, the core tube in the tubular composite member 10 constitutes a tube body.

  Next, the fireproof layer porous sheet 42 of the tubular composite member 10 is impregnated with a fireproof material. Thereafter, the tubular tube is extracted from the tubular composite member 10 impregnated with the refractory material to obtain the cladding tube 3. Then, by externally fitting the cladding tube 3 to the inner tube 2, the fireproof layer porous sheet 42 impregnated with the fireproof material is used as the fireproof layer 32, and the sound absorbing layer porous sheet is not impregnated with the fireproof material. The fireproof double-layer tube 1 having 41 as the sound absorbing layer 31 is obtained.

  In the present invention, the tubular composite member 10 may be extracted from the core tube and externally fitted to the inner tube 2 and then impregnated with a refractory material.

  Also in this manufacturing method, as described above, the tubular composite member 10 before impregnating with the refractory material is color-coded on the porous sheets 41 and 42, so that the boundary position between the porous sheets 41 and 42 and The thickness of each porous sheet 41, 42 can be inspected easily and accurately by visual inspection. Accordingly, it is possible to prevent a product with an inappropriate thickness or the like from being sent to the next process, thereby improving yield and product quality.

Moreover, even after impregnating with the refractory material, as described above, the excess and deficiency of the impregnation amount can be accurately grasped, and the thickness of the refractory layer 32 and the sound absorbing layer 31 can be appropriately adjusted, and the refractory performance and It is possible to provide a high-quality fireproof double-layer tube 1 having excellent sound absorption performance.

  The fireproof double-layer pipe of the present invention can be used as a drain pipe or a ventilation pipe in a building such as an apartment house.

1: Fireproof double-layer tube 10: Tubular composite member 2: Inner tube 3: Cladding tube 31: Sound absorbing layer 32: Fireproof layer 41: Porous sheet for sound absorbing layer 42: Porous sheet for fireproof layer

Claims (5)

A fireproof two-layer pipe comprising an inner tube, a sound absorbing layer provided on the outer periphery of the inner tube, and a fireproof layer provided on the outer periphery of the sound absorbing layer,
The sound absorbing layer is constituted by a sound absorbing layer porous sheet,
The refractory layer is constituted by a porous sheet for a refractory layer impregnated with a refractory material,
The sound absorbing layer porous sheet has a different color from the fireproof layer porous sheet ,
The porous sheet for sound absorbing layer and the porous sheet for fireproof layer are constituted by a nonwoven fabric,
Each or one of the two porous sheets is colored,
The fire-resistant double-layered tube characterized in that the porous sheet to be colored is colored by mixing colored fibers with the sheet .   The fireproof double-layer tube according to claim 1, wherein only one side of the sound absorbing layer porous sheet and the fireproof layer porous sheet is colored. A tube body, Rutotomoni provided on an outer periphery of the tubular body, and a porous sheet for a backing layer constituted by a nonwoven fabric, Rutotomoni provided on the outer periphery of the porous sheet for the backing layer, is constituted by a nonwoven fabric, and the Preparing a tubular composite member comprising a fireproof layer porous sheet having a different color from the sound absorbing layer porous sheet;
Impregnating the refractory layer porous sheet in the tubular composite member with a refractory material;
Obtaining a fire-resistant double-layered tube with the sound absorbing layer porous sheet as a sound absorbing layer and the fire resistant layer porous sheet impregnated with a fire resistant material as a fire resistant layer ,
In the step of preparing the tubular composite member, each or any one of the two porous sheets is colored, and the porous sheet to be colored is colored by mixing colored fibers into the sheet. A method for producing a fire-resistant double-layer pipe, characterized in that The method for manufacturing a fireproof double-layer pipe according to claim 3 , wherein an inner pipe that is a constituent member of the fireproof double-layer pipe is used as the tubular body of the tubular composite member. As a tubular body of the tubular composite member, a core tube that is a support member in the manufacturing process of a fireproof double-layer tube is used,
After performing the step of impregnating with a refractory material, the core tube is extracted from the tubular composite member to obtain a cladding tube, and the cladding tube is externally fitted to an inner tube which is a constituent member of the fireproof two-layer tube. The manufacturing method of the fireproof two-layer pipe | tube of Claim 3 which was made.

Images