JP5969251B2 - 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 housing complexes and office buildings, the outer peripheral surface of the inner pipe made of synthetic resin, steel, cast iron, etc. is made of fireproof material such as mortar for drainage and ventilation piping. A coated refractory double-layer tube 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 is formed by impregnating a fireproof material such as mortar into an outer peripheral coating layer such as a nonwoven fabric sheet provided on the outer peripheral surface of an inner pipe made of synthetic resin, The predetermined fire resistance is obtained.

  In such a refractory double-layer tube, in order to form the outer peripheral covering layer with the nonwoven fabric sheet, both ends (opposing end portions) in the circumferential direction of the nonwoven fabric sheet wound around the inner tube or the like are connected.

  For example, in the fireproof two-layer pipe shown in Patent Document 2, a sheet-like member such as a non-woven sheet is wound around the inner pipe, and both end portions in the circumferential direction of the sheet-like member are partially overlapped, and the overlapped end portions The opposite end portions of the sheet-like member are connected by attaching a tape to the sheet.

JP 2011-21617 A JP 2007-321891 A

  However, in the refractory double-layer tube as shown in the above-mentioned Patent Document 2, because the opposing end portion of the sheet-like member as the outer peripheral coating layer is overlapped, or a tape is attached to the overlapping end portion, The thickness of the overlapping end portion and the tape applying portion becomes thicker than other portions. Therefore, the outer peripheral coating layer (sheet-like member) cannot be formed to have a uniform thickness over the entire circumference, resulting in a problem that the dimensional accuracy such as roundness is lowered. When the roundness decreases, it becomes difficult to form a fireproof layer, etc., provided on the outer peripheral coating layer to have a uniform thickness over the entire circumference, and the fireproof performance varies depending on the position in the circumferential direction, resulting in good fireproof performance. It can be difficult to obtain.

  The present invention has been made in view of the above problems, and can form a porous sheet as an outer peripheral coating layer in a uniform thickness over the entire circumference, improve dimensional accuracy, and is favorable. An object of the present invention is to provide a fire-resistant double-layer pipe capable of obtaining fire resistance and a method for producing the same.

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

[1] A fireproof two-layer pipe in which an outer peripheral covering layer is provided on the outer periphery of the inner pipe, and the outer peripheral covering layer is impregnated with a refractory material to form a fireproof layer,
The outer peripheral covering layer is constituted by a porous sheet that is rolled into a tubular shape and oppositely disposed at both ends in the circumferential direction, and the opposite end of the porous sheet as the outer peripheral covering layer is rake-sewn from the outer surface side. A fire-resistant double-layer tube characterized by being connected by being sewn and stitched.

  [2] The refractory double-layer pipe according to the above item 1, wherein the facing end of the porous sheet as the outer peripheral covering layer is scooped by a scoop sewing machine.

  [3] The fireproof two-layer pipe according to the above item 1 or 2, wherein the opposed end portions of the porous sheet as the outer peripheral coating layer are abutted without being pressed against each other.

  [4] The outer peripheral covering layer according to any one of items 1 to 3, wherein the fireproof layer is provided on an outer surface side and a sound absorbing layer not impregnated with a fireproof material is provided on an inner surface side. Refractory double-layer tube.

[5] The porous sheet is wound around the outer peripheral surface of the inner tube, and both end portions in the circumferential direction of the porous sheet are arranged to face each other, and the opposite end portions are sewn from the outer surface side with a scoop sewing machine and connected. A step of forming an outer peripheral coating layer of the porous sheet on the outer periphery of the inner tube;
And a step of impregnating the outer peripheral coating layer with a refractory material to form a refractory layer.

[6] A porous sheet tubular body is produced by rounding the porous sheet into a tubular shape and arranging both ends in the circumferential direction so as to face each other and stitching the opposite ends with a scoop sewing machine from the outer surface side. Process,
Impregnating the porous sheet tubular body with a refractory material to form a refractory layer;
And a step of externally fitting the porous sheet tubular body to the inner tube.

  According to the fireproof two-layer pipe of the invention [1] and [2], the outer peripheral coating layer can be formed to have a uniform thickness over the entire circumference, the dimensional accuracy such as roundness can be improved, and the fire resistance impregnated in the outer peripheral coating layer. The material can also be adjusted to a uniform thickness, and good fire resistance can be obtained.

  According to the fireproof double-layer tube of the invention [3], the dimensional accuracy can be further improved.

  According to the fireproof double-layer tube of the invention [4], good soundproofing performance can also be obtained.

  According to the manufacturing method of inventions [5] and [6], a refractory double-layer tube having the same effects as described above can be obtained.

FIG. 1 is a perspective view showing a fireproof double-layer pipe according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing the fireproof double-layer tube of the embodiment. FIG. 3 is an enlarged perspective view showing a connecting end portion of the porous sheet applied to the fireproof double-layer pipe 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, this fireproof double-layer tube 1 is provided with an outer peripheral coating layer 3 constituted by a porous sheet 4 on the outer peripheral surface of the inner tube 2 and in the thickness direction inside the outer peripheral coating layer 3 ( The refractory material is impregnated only outside (in the radial direction). And the outer periphery coating layer 3 is comprised by the fireproof layer 32 comprised by the part by which the porous sheet 4 was made into the base material, and the pore was impregnated with the fireproof material, and the part which is not impregnated with the fireproof material. The sound absorbing layer 31 is provided.

  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). The dimensions of the inner tube 2 and the tube shape such as a straight tube, a bent tube, and a branch tube are not limited.

  The porous sheet 4 constituting the outer peripheral coating layer 3 is a base material for impregnating a refractory material to form the refractory layer 32, and after curing, acts as a reinforcing material for the refractory layer 32. 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, the porous sheet 4 may be woven or knitted 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 shape retention is enhanced by compressing or needle punching the nonwoven fabric, the shape retention after impregnation with the refractory material is enhanced, and as a result, the roundness of the refractory double-layer tube 1 can be enhanced.

  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 porous sheets 4, the nonwoven fabric has the most excellent reinforcing effect.

  The thickness of the porous sheet 4 (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 thickness of the porous sheet 4 is preferably 3 to 30 mm.

  In the present embodiment, a porous sheet 4 having a two-layer structure may be used. That is, since the porous sheet 4 is impregnated with a refractory material to form the refractory layer 32, a portion of the porous sheet 4 to be impregnated with the refractory material (the refractory layer 32 is to be formed). Part) is constituted by a low-density layer such as a non-woven fabric having a low density, and a part that is not desired to be impregnated with a refractory material (part where the sound absorbing layer 31 is to be formed) is constituted by a high-density layer such as a non-woven fabric having a high density. To do. Since the low-density layer is more easily impregnated with the refractory material than the high-density layer, only the low-density layer of the porous sheet 4 (outer peripheral coating layer 3) can be reliably impregnated with the refractory material. By using the porous sheet 4 having the two-layer structure of the low-density layer and the high-density layer in this way, the degree of impregnation of the refractory material can be accurately controlled, and the refractory layer 32 and the sound absorbing layer can be accurately applied to desired portions. Layer 31 can be formed.

  In this embodiment, the outer periphery coating layer 3 is comprised by the porous sheet 4 rounded by the tubular shape.

  Both ends 41 and 42 in the circumferential direction of the porous sheet 4 which is the outer peripheral coating layer 3 are abutted and connected by a specific method. That is, as shown in FIGS. 2 and 3, in a state where the opposed end surfaces at both end portions 41 and 42 of the porous sheet 4 are butted, the facing end portions (butting end portions) 41 and 42 are scooped from the outer surface side and stitched. By doing so, they are connected.

  In the present embodiment, scooping is a method of sewing that scoops while scooping a region between the opposed end portions 41 and 42 of the porous sheet 4. For example, the sewing thread 5 inserted into one end portion 41 of the porous sheet 4 from the outer surface side is passed through the butted end surfaces of both end portions 41 and 42 and scooped out from the outer surface side of the other end portion 42 of the porous sheet 4. How to sew. This rake stitching is continuously repeated along the opposed end portions 41 and 42 of the porous sheet 4, so that the opposed end portions 41 and 42 of the porous sheet 4 are sewn with the sewing thread 5 in the entire axial direction. To be connected.

  In the rake sewing of the present invention, the rake width (interval in the circumferential direction), the pitch in the axial direction, and the like are not particularly limited. In short, any sewing method may be used as long as it is a sewing method that sews while scooping a region spanning the opposing end portions 41 and 42 in the porous sheet 4.

  In the present embodiment, rake stitching can be performed using a commercially available rake sewing machine (rake stitch sewing machine).

  In the present embodiment, the material of the sewing thread 5 used for rake sewing is not particularly limited, and fibers and the like that are similar to the fibers used as the nonwoven fabric material as the porous sheet 4 are preferably used. Can do.

  Here, in the present embodiment, by adjusting the tension of the sewing thread 5 and the way of passing the sewing thread 5, the outer portions (opposed portions where the fireproof layer 32 is to be formed) of the opposed end portions 41 and 42 of the porous sheet 4 are formed. It is preferable to make the contact with each other lightly in a natural state (non-pressing state) without compressive deformation. That is, if the outer portions of the opposed end portions 41 and 42 of the porous sheet 4 are compressed and deformed, the compression deformed portion cannot be sufficiently impregnated with a refractory material, and the fire resistance performance may be deteriorated. .

  Furthermore, it is preferable that the inner portions (portions where the sound absorbing layer 31 is to be formed) of the butted end portions 41 and 42 of the porous sheet 4 are in contact with each other. That is, if a gap is formed in the inner portions of the butted end portions 41 and 42 of the porous sheet 4, the refractory material will inadvertently enter the gap, that is, the portion where the sound absorbing layer 31 is to be formed. There is a fear and it is not preferable.

  In the present invention, the opposed end portions 41 and 42 of the porous sheet 4 as the outer peripheral coating layer 3 are not necessarily matched. That is, in the present invention, a slight gap may be formed between the opposed end portions 41 and 42 of the porous sheet 4. This gap may be partial or complete. In particular, the outer portions of the opposed end portions 41 and 42 of the porous sheet 4 do not cause any problems even if a slight gap is formed as long as the refractory material can be held in a stable state.

  However, in the present invention, in order to ensure homogenization of the entire circumference more reliably, the opposite end portions 41 and 42 of the porous sheet 4 as the outer peripheral coating layer 3 are abutted as in the above embodiment. Good to do.

  In the present embodiment, the sewing thread 5 passed through the opposed end portions 41 and 42 of the porous sheet 4 is passed through the outer portion of the porous sheet 4 (the portion where the fireproof layer 32 is to be formed). . However, in the present invention, the sewing thread 5 may be passed through the inner portion of the porous sheet 4 (the portion where the sound absorbing layer 31 is to be formed).

  Thus, in this embodiment, since the both ends 41 and 42 of the porous sheet 4 in the outer periphery coating layer 3 are sewed and connected in a state of abutting, the porous sheet 4 which is the outer periphery coating layer 3 is connected. Thus, the porous sheet 4, that is, the outer peripheral coating layer 3, can be set to a uniform thickness over the entire circumference. In other words, the outer peripheral surface of the outer peripheral coating layer 3 can be formed into a smooth peripheral surface without unevenness. Therefore, the roundness on the outer peripheral surface of the outer peripheral coating layer 3 can be increased, and as a result, the dimensional accuracy such as the roundness of the fireproof double-layer tube 1 can be improved.

  In FIG. 2, the presence of the sewing thread 5 is exaggerated for easy understanding of the invention. That is, in FIG. 2, the sewing thread 5 is described as protruding from the outer peripheral covering layer 3, but actually, the sewing thread 5 is arranged to bite into the outer peripheral side of the outer peripheral covering layer 3, and It does not protrude from the outer peripheral surface.

  In the present embodiment, the refractory layer 32 is formed by impregnating the outer peripheral covering layer 3 with a refractory material. 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 outer peripheral coating layer 3 can be set to a uniform thickness over the entire circumference including the opposed end portions 41 and 42 of the porous sheet 4, so that the refractory material can be applied over the entire circumference. A uniform thickness can be impregnated. 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, from the viewpoints of strength, density, fire resistance, etc. after curing, various Portland cements of normal, early strength, medium heat and super early strength, or fly ash and blast furnace slag are mixed with these Portland cements. Blast furnace cement can be exemplified. Also, aggregates and various additives can be appropriately mixed with them. Water is mixed with these solid materials, and the outer peripheral coating layer 3 is impregnated 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 outer peripheral coating layer 3. 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 4 as the outer peripheral coating layer 3 functions as a reinforcing material. There is no need to mix the fibers. Since fiber mortar may prevent penetration into the porous sheet 4, it is preferable not to mix the fibers.

  The refractory layer 32 uniformly contains the fibers and resin constituting the outer peripheral coating layer 3 (porous sheet 4) 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.

  What is necessary is just to set the thickness of the fireproof layer 32 suitably according to the thickness of the outer periphery coating layer 3, an intended purpose, a construction place, etc. 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 portion (non-impregnated portion) that is not impregnated with the refractory material in the outer peripheral coating layer 3. 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.

  As described above, in the present embodiment, since the outer peripheral covering layer 3 and the refractory layer 32 can be formed with a uniform thickness over the entire circumference and with a high roundness, the sound absorbing layer 31 is similarly formed with a uniform thickness over the entire circumference. In addition, it can be formed with high roundness.

  The fireproof double-layer tube 1 configured as described above can be manufactured, for example, by the following method.

  First, the porous sheet 4 is wound around the inner tube 2, and rake stitching is performed using a rake sewing machine in a state in which both end portions 41 and 42 of the porous sheet 4 are abutted. Thereby, the outer peripheral coating layer 3 by the porous sheet 4 is formed on the outer peripheral surface of the inner tube 2.

  Thus, only the outer surface side of the outer peripheral coating layer 3 provided on the outer peripheral surface of the inner tube 2 is impregnated with a refractory material and cured and cured. The curing period may be appropriately set according to the composition of the refractory material, the thickness of the refractory layer 32, the environment, and the like.

  Thereby, the refractory double tube 1 in which the refractory layer 32 is formed in the portion of the outer peripheral coating layer 3 impregnated with the refractory material 3 and the sound absorbing layer 31 is formed in the portion not impregnated can be manufactured.

  In the present invention, before the porous sheet 4 is wound around the inner tube 2, the porous sheet 4 is rolled into a tubular shape to form a tubular body in which the opposite end portions 41 and 42 of the porous sheet 4 are connected. You may do it. For example, the porous sheet 4 is wound around the core tube corresponding to the inner tube 2, and is sewn with a scoop sewing machine in a state where both ends 41 and 42 of the porous sheet 4 are in contact with each other. A coating layer 3) is produced. And only the outer peripheral surface side of the porous sheet tubular body is impregnated with a refractory material and cured and cured. Thereafter, the porous sheet tubular body is extracted from the core tube, and the tubular body is externally fitted to the inner tube 2 so that the outer surface of the inner tube 2 is impregnated with a refractory material. The layer 3) is formed to produce the refractory double-layer tube 1.

  Furthermore, in the present invention, the porous sheet tubular body (outer peripheral coating layer 3) may be externally fitted to the inner tube 2 before impregnating the fireproof material. For example, the porous sheet 4 is wound around a core tube corresponding to the inner tube 2 and is stitched with a scoop sewing machine in a state where both ends 41 and 42 of the porous sheet 4 are in contact with each other, thereby producing a tubular body of the porous sheet 4 To do. Then, the porous sheet tubular body is extracted from the core tube and externally fitted to the inner tube 2, and an outer peripheral coating layer made of the porous sheet 4 is formed outside the inner tube 2. Thereafter, only the outer peripheral surface side of the outer peripheral coating layer 3 is impregnated with a refractory material and cured and cured to form the fire-resistant two-layer tube 1.

  When the fireproof double pipe 1 having the above configuration is used as, for example, a drainage pipe of an apartment, a sound (water flow sound) generated by the water flowing inside does not leak out of the pipe. That is, the 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.

  Moreover, since the fireproof layer 32 is formed by impregnating the outer peripheral coating layer 3 with a fireproof material, a predetermined fireproof performance can be obtained.

  Moreover, in this embodiment, since the both ends 41 and 42 of the porous sheet 4 as the outer periphery coating layer 3 are sewed and connected with a scoop sewing machine, the outer periphery coating layer 3 has a uniform thickness over the entire circumference. A high-quality fireproof double tube 1 that can be formed and has high roundness can be obtained. Furthermore, since the fireproof layer 32 and the sound absorbing layer 31 formed on the outer peripheral covering layer 3 can be formed to have a uniform thickness as described above, it is possible to obtain a fireproof performance and a sound absorbing performance with no variation over the entire circumference. In addition, the sound absorption performance can be further improved.

  In the above embodiment, the sound absorbing layer 31 that is not impregnated with the refractory material is formed in the outer peripheral covering layer 3, but the sound absorbing layer 3 is not necessarily provided. For example, by impregnating a refractory material over the entire thickness direction of the outer peripheral coating layer 3, the entire thickness direction of the outer peripheral coating layer 3 may be formed in the refractory layer 32, and no sound absorbing layer may be provided.

  The fireproof double 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 tube 2: Inner tube 3: Outer peripheral coating layer 32: Fireproof layer 31: Sound absorbing layer 4: Porous sheet 41, 42: End of the porous sheet

Claims (6)

A fireproof two-layer pipe in which an outer peripheral coating layer is provided on the outer periphery of the inner pipe, and the outer peripheral coating layer is impregnated with a refractory material to form a fireproof layer,
The outer peripheral covering layer is constituted by a porous sheet that is rolled into a tubular shape and oppositely disposed at both ends in the circumferential direction, and the opposite end of the porous sheet as the outer peripheral covering layer is rake-sewn from the outer surface side. Connected by being stitched ,
A fire-resistant double-layer pipe, wherein a sewing thread by rake sewing is arranged so as to pass through opposite ends of the porous sheet .   The fireproof two-layer pipe according to claim 1, wherein a facing end portion of the porous sheet as the outer peripheral covering layer is scooped by a scoop sewing machine. Porous opposite ends of the sheet, refractory bilayer tube according to claim 1 or 2 which is match-by state in which no pressure as the outer peripheral coating layer.   The fireproof layer according to any one of claims 1 to 3, wherein the outer peripheral coating layer is provided with the fireproof layer on an outer surface side thereof and a sound absorbing layer not impregnated with a fireproof material on an inner surface side thereof. Double-layer tube. The porous sheet is wound around the outer peripheral surface of the inner tube, and both ends in the circumferential direction of the porous sheet are arranged to face each other, and the opposite ends are connected by sewing with a scoop sewing machine from the outer surface side. Forming an outer peripheral coating layer of the porous sheet on the outer periphery of the inner tube;
Look including a step of forming a refractory layer by impregnating the refractory material to the outer peripheral coating layer,
A method for producing a fire-resistant double-layer pipe, characterized in that sewing thread by rake sewing is arranged so as to pass through opposite ends of the porous sheet . The porous sheet is rolled into a tubular shape and both ends in the circumferential direction are arranged opposite to each other, and the opposite ends are connected by sewing with a scoop sewing machine from the outer surface side, thereby producing a porous sheet tubular body;
Impregnating the porous sheet tubular body with a refractory material to form a refractory layer;
A step of fitted the porous sheet tubular body into the inner tube seen including,
A method for producing a fire-resistant double-layer pipe, characterized in that sewing thread by rake sewing is arranged so as to pass through opposite ends of the porous sheet .

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