JP6063664B2 - 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, the fireproof double-layer pipe shown in Patent Document 1 includes a synthetic resin inner pipe and a non-woven cloth layer provided on the outer peripheral surface of the inner pipe and made of a non-woven cloth. Impregnated with refractory material. Of the nonwoven fabric layer, 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 non-woven fabric layer is formed by wrapping a non-woven fabric around an inner tube or the like, and then only the outer portion of the non-woven fabric layer is impregnated with mortar.

JP 2011-21617 A

  However, in the conventional fireproof two-layer pipe shown in Patent Document 1, the fireproof layer impregnated with mortar out of the nonwoven fabric layer has a high weight, so that the fireproof layer is deformed so as to hang downward due to its own weight. Therefore, there was a problem that the roundness of the refractory layer was lowered. Further, in this fireproof two-layer pipe, it is difficult to sufficiently secure the adhesive strength of the mortar, and the fireproof layer portion of the outer peripheral portion of the fireproof layer is also dropped due to delamination.

  The present invention has been made in view of the above problems, and has a refractory double-layer pipe that can prevent the refractory layer from peeling off or falling off, and the roundness of the refractory layer is high. It aims to provide a method.

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

[1] A step of preparing a tubular composite member comprising a tubular body and a porous sheet provided on the outer periphery of the tubular body;
A step of impregnating the porous sheet in the tubular composite member with a refractory material from the outside to form a refractory layer;
Before the porous sheet is impregnated with a refractory material, or before the refractory material impregnated in the porous sheet is cured, a tubular mesh sheet having elasticity is provided outside the tubular porous member. A process of covering the contact state,
And a step of removing excess refractory material remaining on the outside of the cylindrical mesh sheet.

  [2] The method for producing a fire-resistant two-layer pipe according to item 1, wherein the step of removing the surplus refractory material scrapes off and removes the surplus refractory material using a scraper.

  [3] The step of removing excess refractory material, wherein the excess refractory material is removed so that an outer peripheral surface of the cylindrical mesh sheet is exposed to the outside. A method for manufacturing a fireproof double-layer tube.

  [4] The method for producing a fire-resistant double-layer pipe according to any one of the preceding items 1 to 3, wherein an inner pipe which is a constituent member of a fire-resistant double-layer pipe is used as the tubular body of the tubular composite member.

[5] 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 removing excess 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 that is a constituent member of the fireproof double-layer tube. Item 4. A method for producing a fireproof double-layer tube according to any one of items 1 to 3 above.

[6] Inner pipe,
A porous sheet provided on the outer periphery of the inner tube;
A cylindrical mesh sheet that is covered in close contact with the outside of the porous sheet and has elasticity,
A fireproof layer formed by impregnating the porous sheet and the cylindrical mesh sheet with a fireproof material,
A fireproof double-layered tube characterized in that a streak-like removal mark formed by removing excess fireproof material is provided on an outer peripheral surface.

  [7] The fireproof double-layer pipe according to the above item 6, wherein the removal trace is a scraping trace formed by scraping off excess refractory material.

  [8] The fireproof double-layer tube according to item 7, wherein the scratch removing mark is provided in a spiral shape.

  According to the method for manufacturing a fireproof double-layer pipe of the invention [1], the fireproof layer is restrained from the outside by the cylindrical mesh sheet, so that the roundness of the fireproof layer is high and the fireproof layer can be prevented from peeling off or falling off. A refractory double layer tube can be provided. In particular, this manufacturing method removes excess refractory material remaining on the outside of the mesh sheet, thus preventing the formation of a refractory layer that easily peels off or falls off on the outside of the mesh sheet. It is possible to provide a refractory double-layer pipe that can more reliably prevent the refractory layer from peeling off or falling off.

  According to the method for manufacturing a refractory double-layer pipe of the inventions [2] to [5], the above effect can be obtained more reliably.

  According to the fireproof two-layer pipes of the inventions [6] to [8], the roundness of the fireproof layer is high, the fireproof layer can be prevented from being peeled off and dropped, and the quality can be improved.

FIG. 1 is an external perspective view showing a fireproof double-layer pipe according to an embodiment of the present invention. FIG. 2 is a perspective view showing a fireproof double-layer pipe according to the embodiment with a part thereof cut away. FIG. 3 is a cross-sectional view showing the fireproof double-layer tube of the embodiment. FIG. 4 is a schematic perspective view for explaining the impregnation step of the refractory material when manufacturing the refractory double-layer tube of the embodiment. FIG. 5 is an enlarged cross-sectional view showing the periphery of the refractory layer in the refractory double-layer pipe of the embodiment.

  1 and 2 are perspective views showing a fireproof double-layer pipe 1 according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view showing the fireproof double-layer pipe 1 according to the embodiment.

  As shown in these drawings, the fireproof double-layer tube 1 includes an inner tube 2, a cladding tube 3 laminated on the outer peripheral surface of the inner tube 2, and a cylindrical mesh sheet 5 covered on the outer peripheral surface of the cladding tube 3. And. 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). As will be described in detail later, in the fireproof double-layer tube 1 of the present embodiment, as shown in FIG. 1, a spiral scraping mark 70 is formed on the outer peripheral surface by scraping off excess fireproof material. Has been.

  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 fireproof layer porous sheet 42 arranged on the outer peripheral side of the cladding tube 3 becomes a base material for retaining the fireproof material when impregnated with the fireproof material, and after the fireproof material is cured, the fireproof layer 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 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 the present embodiment, the outer peripheral surface of the tubular composite member 10 formed by winding the porous sheets 41 and 42 around the inner tube 2 is covered with the tubular mesh sheet 5 having elasticity, and is in close contact with the porous sheet 42 for the refractory layer. Let Since the mesh sheet 5 has a stretchable cylindrical shape, it can be easily covered with the porous sheet 42 for the refractory layer if it is expanded and expanded, and if the diameter expansion force is removed, the mesh sheet 5 is automatically shrunk to become a porous sheet for the refractory layer. 42 is in close contact. Moreover, since it does not twist or overlap, it can be made to contact | adhere to the porous sheet 42 for fireproof layers with a uniform pressure in the circumferential direction, and the roundness of the fireproof double-layer tube 1 can be increased.

  The cylindrical mesh sheet 5 restrains the refractory layer 32 from the outside and assists in shape retention. Since the mesh sheet 5 is mesh-like, the mesh sheet 5 has a mesh size that allows a wet refractory material to pass through as well as air permeability, and has elasticity and adheres to the porous sheet 42 for the fire-resistant layer. It is a condition to do. Therefore, the cylindrical mesh sheet 5 is also required to have a normal inner diameter that is smaller than the outer diameter of the cladding tube 3, that is, the outer diameter of the wound porous sheet 42 for a refractory layer. The mesh size is preferably a size that does not hinder the passage of the refractory material in the refractory material impregnation step and that can provide a sufficient restraining force for the refractory layer 32, and a range of 1 to 10 mm can be recommended. Needless to say, if the mesh size is in the above range, curing is not hindered in the curing process. A particularly preferable mesh size is 1 to 5 mm.

  The material and structure of the cylindrical mesh sheet 5 are not limited as long as stretchability is obtained. For example, a stretchable material made of polyester, polyethylene terephthalate (PET polyester), polyamide (6-nylon, 6,6 nylon, etc.), acrylic, polyvinyl alcohol (vinylon, etc.), polyolefin synthetic resin or rubber It may be a molded one or a non-stretchable fiber such as cotton or wool woven with the above stretchable material. In addition to the material itself having stretchability, a net-like body having stretchability in the radial direction by crossing synthetic resin filaments by extrusion molding and joining the intersections may be used. Since the cylindrical mesh sheet 5 constrains the refractory layer 32 from the radial direction, it does not require expansion and contraction in the axial direction (length direction) of the tube, so that the above-described net-like body can be suitably used. Examples of the material of the network include high-density or low-density polyethylene, polypropylene, and ethylene-vinyl acetate copolymer (EVA). The network formed by extrusion does not collapse, and there is no deviation or peeling of the intersection. Therefore, even if it contacts a wet refractory material, it does not deteriorate.

  In the present embodiment, the fire-resistant layer 32 is formed by impregnating a fire-resistant material into the fire-resistant layer porous sheet 42 covered with the cylindrical mesh sheet 5.

  As a method for impregnating the refractory material, for example, a method by spraying can be cited as a suitable example. That is, after covering the tubular composite member 10 in which the porous sheets 41 and 42 are wound around the inner tube 2 with the tubular mesh sheet 5, the fireproof material is sprayed from the outside to the tubular composite member 10 with the mesh sheet, A method of impregnating the refractory layer porous sheet 42 with the refractory material through the cylindrical mesh sheet 5 can be suitably employed.

  Specifically, as shown in FIG. 4, the tubular composite member 10 with a mesh sheet is driven to rotate around the axis while the fire-resistant material 33 such as mortar is fed from the injection nozzle 6 of the fire-resistant material injection device. The spray nozzle 6 is moved along the axial direction of the tubular composite member 10 while spraying the outer peripheral surface of the member 10. Thereby, the refractory material 33 is sprayed evenly over the entire outer peripheral surface of the tubular composite member 10, and the refractory material 33 is impregnated into the fire-resistant layer porous sheet 42 via the cylindrical mesh sheet 5, thereby Layer 32 is formed.

  In the present embodiment, the impregnation method of the refractory material 33 is not particularly limited, and methods such as coating, pouring, and immersion can be used in addition to the above-described spraying method. 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 33, it is preferable to employ a mortar, in particular, a cement-based mortar from the viewpoint 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 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, after impregnating the refractory material 33 such as mortar into the porous sheet 42 for the refractory layer, before the refractory material 33 is cured and cured, surplus remaining on the outside of the cylindrical mesh sheet 5. Scraping refractory material.

  As a method for scraping off the excess refractory material, for example, a method of scraping with a scraper in parallel with the impregnation treatment of the refractory material 33 can be cited as a preferred example. That is, as shown in FIG. 4, the refractory material 33 is impregnated into the refractory layer porous sheet 42 by spraying as described above, while behind the injection nozzle 6 (upstream with respect to the movement direction of the injection nozzle 6). The tip of the flat plate-shaped scraper 7 arranged in the above is pressed against the outer surface of the refractory layer 32 on which the refractory material 33 is sprayed via the mesh sheet 5. In this state, the scraper 7 is moved at the same speed as the injection nozzle 6 along the axial direction of the tubular composite member 10 so as to follow the injection nozzle 6. Thereby, in the entire outer peripheral surface of the tubular composite member 10, of the refractory material 33 sprayed from the injection nozzle 6, surplus refractory material remaining outside the mesh sheet 5 is scraped off by the scraper 7, The fireproof two-layer pipe 1 of the embodiment is obtained.

  As shown in FIG. 1, on the outer peripheral surface of the refractory double-layer tube 1, an excess refractory material is scraped off by a scraper 7, thereby forming a scraping trace 70 as a removal trace. The scraping marks 70 are formed in a spiral shape on the outer peripheral surface of the fireproof double-layer tube 1. Furthermore, as shown in FIG. 5, the fireproof double-layer pipe 1 from which the surplus fireproof material has been scraped is disposed so that the outer peripheral surface of the cylindrical mesh sheet 5 is substantially on the outer peripheral surface of the fireproof double-layer pipe 1. It is in a state exposed to the outside without being covered with the refractory material 33.

  In the present embodiment, the scraper 7 used when scraping off excess refractory material is not limited to the above. For example, in addition to the flat scraper 7 as described above, a ring scraper disposed so as to be fitted around the tubular composite member 10 (fireproof two-layer pipe 1) may be used. Further, excess refractory material may be removed using a removing means other than a scraper. For example, blow off excess refractory material with an air slitter, wipe off excess refractory material with a brush, wipe off excess refractory material with a cloth-like member, and remove excess refractory material Anyway. When excess refractory material is removed with an air slitter, streaky removal marks similar to those of the scraper 7 remain, and when removed with a brush or cloth-like member, a large number of fine streak removal marks are left. Will remain. In any case, when excess refractory material is removed, streak-like removal marks are formed on the outer peripheral surface of the refractory double-layer tube 1.

  The fireproof double-layer pipe 1 of this embodiment is used as a drain pipe of an apartment, for example. 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.

  According to the fireproof double-layer tube 1 of the present embodiment, since the fireproof layer 32 is restrained in the radial direction by the shrinkage force of the cylindrical mesh sheet 5, the roundness of the fireproof layer 32 is high and the quality is improved. Can do.

  Furthermore, since the outermost layer of the refractory double-layer tube 1 is the mesh sheet 5 and the refractory layer 32 is protected by the mesh sheet 5, the refractory layer 32 can be prevented from being peeled off or dropped off.

  In particular, in the present embodiment, surplus refractory material remaining on the outside of the mesh sheet 5 is scraped off, so that the refractory layer 32 can be more reliably prevented from being peeled off or dropped off. That is, when an excess of the refractory material remains on the outside of the mesh sheet 5 and the refractory material is cured to become a part of the refractory layer, the refractory layer is formed on the outside of the mesh sheet 5. . In this case, the fireproof layer peels off at the position of the mesh sheet 5 due to a slight impact, and the fireproof layer outside the mesh sheet falls off.

  Therefore, in the present embodiment, since the refractory material outside the mesh sheet is scraped off and removed, the formation of a refractory layer on the outside of the mesh sheet can be prevented. Thus, since the fireproof layer which peels off easily and is not formed is formed, it is possible to prevent the fireproof layer 32 from peeling and dropping more reliably.

  Furthermore, in the present embodiment, the fireproof layer 32 can be formed by scraping off the excess fireproof material, so that the roundness of the fireproof layer 32 can be further increased.

  Moreover, in the fireproof two-layer pipe 1 of this embodiment, it has the effect which prevents the damage at the time of transportation or piping construction by the mesh sheet 5 becoming a shock absorbing material.

  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.

  Next, the tubular composite member 10 is covered with the cylindrical mesh sheet 5 on the outer peripheral surface, and is brought into close contact with the outer peripheral portion of the fireproof layer porous sheet 42.

  Next, as shown in FIG. 4 and the like, the fireproof layer porous sheet 42 in the tubular composite member 10 with the mesh sheet is impregnated with the fireproof material 33 from the outside of the mesh sheet 5, while remaining on the outside of the mesh sheet 5. The excess refractory material 33 is scraped off with a scraper 7 or the like and removed.

  Thereby, the fireproof double-layer tube 1 of this embodiment can be produced.

  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 tubular mesh sheet 5 is covered on the outer periphery of the tubular composite member 10 and is brought into close contact with the outer peripheral portion of the porous sheet for fireproof layer 42.

  Next, the porous fireproof layer porous sheet 42 in the tubular composite member 10 with the mesh sheet is impregnated with the fireproof material 33 from the outside of the mesh sheet 5, while the surplus fireproof material 33 remaining on the outside of the mesh sheet 5. Is removed by scraping with a scraper 7 or the like (see FIG. 4 and the like).

  Thereafter, the core tube is extracted from the tubular covering member 10 impregnated with the refractory material 33 to obtain the covering tube 3. And the fireproof two-layer pipe 1 of this embodiment can be produced by externally fitting this cladding tube 3 to the inner tube 2.

  In the present invention, the fireproof material may be impregnated after the tubular composite member 10 is extracted from the core tube and externally fitted to the inner tube 2.

  In the embodiment and the modification, the porous mesh 42 for the refractory layer is impregnated with the refractory material 33 before the cylindrical mesh sheet 5 is covered, but the present invention is not limited thereto, and in the present invention, After impregnating the refractory material 33 in the porous sheet 42 for the refractory layer, the tubular mesh sheet 5 may be covered before the refractory material 33 is cured and cured. Also in this case, the cylindrical mesh sheet 5 bites into the fireproof layer porous sheet 42 impregnated with the uncured fireproof material 33 by its own elastic contraction force, and the mesh sheet 5 becomes the fireproof layer porous. The sheet 42 is in close contact with the sheet 42.

  However, when the uncured refractory material 33 is coated on the outer periphery of the tubular composite member 10 and the cylindrical mesh sheet 5 is covered on the outer periphery, the mesh sheet 5 cannot be smoothly attached. Therefore, in the present invention, it is preferable to perform the operation of attaching the mesh sheet 5 before the tubular composite member 10 is coated (impregnated) with the refractory material 33.

  Further, in the above embodiment, the sound absorbing layer porous sheet 41 and the fireproof 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.

  Furthermore, in the said embodiment, although the case where two layers, the sound absorption layer 31 and the fireproof layer 32, were formed in the cladding tube 3 was described as an example, the present invention is not limited thereto, and the present invention is applied to the cladding tube 3. The present invention can also be applied to a refractory double-layer pipe in which only the refractory layer 32 is formed. For example, a non-woven fabric layer as the cladding tube 3 may be formed on the outer periphery of the inner tube 2, and a fire-resistant layer may be formed by impregnating a fire-resistant material such as mortar over the entire thickness direction of the non-woven fabric layer. .

  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: Refractory double-layer pipe 10: Tubular composite member 2: Inner pipe (pipe)
3: cladding tube 32: fireproof layer 33: fireproof material 42: porous sheet for fireproof layer 5: cylindrical mesh sheet 7: scraper 70: scraping trace (removal trace)

Claims (7)

Preparing a tubular composite member comprising a tubular body and a porous sheet provided on an outer periphery of the tubular body;
A step of impregnating the porous sheet in the tubular composite member with a refractory material from the outside to form a refractory layer;
Before the porous sheet is impregnated with a refractory material, or before the refractory material impregnated in the porous sheet is cured, a tubular mesh sheet having elasticity is provided outside the tubular porous member. A process of covering the contact state,
Look including the step of removing the refractory material of the excess remaining on the outside of the tubular mesh sheet,
In the step of removing the excess refractory material, the excess refractory material is removed so that the outer peripheral surface of the cylindrical mesh sheet is exposed to the outside . Production method.   The method for producing a fire-resistant two-layer tube according to claim 1, wherein the step of removing the surplus refractory material is a method of scraping off and removing the surplus refractory material using a scraper. The method for producing a fire-resistant double-layer pipe according to claim 1 or 2 , 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. 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 removing excess 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 that is a constituent member of the fireproof double-layer tube. The manufacturing method of the fireproof two-layer pipe | tube of Claim 1 or 2 which was made. An inner pipe,
A porous sheet provided on the outer periphery of the inner tube;
A cylindrical mesh sheet that is covered in close contact with the outside of the porous sheet and has elasticity,
A fireproof layer formed by impregnating the porous sheet and the cylindrical mesh sheet with a fireproof material,
A fire-resistant double-layer pipe , wherein the outer peripheral surface of the cylindrical mesh sheet is disposed on the outer peripheral surface . The fireproof double-layer pipe according to claim 5 , wherein a streak-like scratch mark is provided on the outer peripheral surface . The fireproof double-layer pipe according to claim 6 , wherein the scraping trace is provided in a spiral shape.

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