Pipe structure

Abstract

To provide a pipe structure that can close a pipe line at the time of a fire even if a thermally expandable member is located above a floor slab.SOLUTION: A pipe structure comprises a resin collecting joint 10, and a covering material 20 that is an aggregate of a fibrous material. The collecting joint 10 comprises an upper connection pipe 11, a lower connection pipe 12 located below the upper connection pipe 11, and a thermally expandable member. The upper connection pipe 11 comprises a vertical pipe connection part 13 and a horizontal pipe connection part 14. The lower connection pipe 12 comprises an inclined pipe part 17 gradually narrowed downward from the upper connection pipe 11, and a lower side pipe part 18 located below the inclined pipe part 17. The covering material 20 partially or wholly covers an outer peripheral surface of the inclined pipe part 17. The thermally expandable member is located above the covering material 20 and below the horizontal pipe connection part 14. When the pipe structure is installed in a floor slab 103, a lower end of the thermally expandable member is located at a position equal to an upper surface of the floor slab 103 or higher than the floor slab 103.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a piping structure. [Background technology]

[0002] Conventionally, a method has been presented for providing fire resistance in a piping structure having a component (a joint assembly) with a connection part for a horizontal pipe extending approximately horizontally to a pipe having a vertical flow path in an up-down direction (see, for example, Patent Document 1).

[0003] In the piping structure of Patent Document 1, a thermal expansion member is located on the outer circumferential surface of the collective joint, and the thermal expansion member is located inside the through hole of the floor slab. In the event of a fire, the thermal expansion member expands radially inward due to heat, blocking the pipeline of the piping structure. Therefore, the invention of Patent Document 1 can prevent flames, smoke, etc. from rising to upper floors through the piping structure in the event of a fire. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2017-014769 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, if the location or specifications of the equipment on the upper floors are changed, the collective joint may need to be shifted above the floor slab. If the collective joint is shifted upward, the thermal expansion member will be located above the floor slab, and there is a risk that the thermal expansion member will not be able to adequately close the pipes in the event of a fire. This means that the design freedom of the upper floors cannot be increased. SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a piping structure that can block a pipeline in the event of a fire even if a thermal expansion member is located above a floor slab. [Means for solving the problem]

[0006] The present invention has the following aspects. <1> The present invention has a resin assembly joint and a coating material which is an assembly of fibrous materials, The assembly joint includes an upper connecting pipe, a lower connecting pipe located below the upper connecting pipe, and a thermal expansion member, The upper connecting pipe has a vertical pipe connecting portion and a horizontal pipe connecting portion, the lower connecting pipe has an inclined pipe section that gradually narrows downward from the upper connecting pipe, and a lower pipe section located below the inclined pipe section, The covering material covers a part or the whole of an outer circumferential surface of the inclined tube portion, the thermal expansion member is located above the covering material and below the horizontal pipe connection portion, A piping structure in which, when installed on a floor slab, the lower end of the thermal expansion member is at a position equal to or higher than the upper surface of the floor slab. <2> The covering material is felt. <1> Piping structure. <3> The thermal expansion member surrounds the outer circumferential surface of the collective joint. <1> or <2> The piping structure according to claim 1. Effect of the Invention

[0007] The piping structure of the present invention is capable of blocking the pipeline in the event of a fire even if the thermal expansion member is located above the floor slab. [Brief description of the drawings]

[0008] [Figure 1] 1 is a partially cutaway front view of a piping structure according to a first embodiment of the present invention. [Diagram 2] FIG. 4 is a partially cutaway front view of a piping structure according to a second embodiment of the present invention. [Diagram 3] FIG. 11 is a partially cutaway side view of a piping structure according to a third embodiment of the present invention. [Figure 4] FIG. 4 is a partially enlarged view of FIG. [Diagram 5] FIG. 11 is a process diagram of a piping structure according to a third embodiment of the present invention. [Figure 6] FIG. 11 is a partially cutaway front view of a piping structure according to another embodiment. [Figure 7] FIG. 11 is a front view of a piping structure according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The piping structure of the present invention includes a resin assembly joint, a coating material which is an assembly of fibrous materials, and a thermally expandable member. Hereinafter, a piping structure according to an embodiment of the present invention will be described with reference to the drawings.

[0010] (First embodiment) The first embodiment of the present invention has a group joint 10 that penetrates a floor slab 103 and a covering material 20 that covers the outer peripheral surface of the group joint 10. In the following description, the direction along the central axis O of the vertical pipe connecting part 13 is referred to as the axial direction, the upper connecting pipe 11 side of the vertical pipe connecting part 13 along the axial direction is referred to as the upper side, and the lower connecting pipe 12 side is referred to as the lower side. In addition, the direction perpendicular to the central axis O in a plan view from the axial direction is referred to as the radial direction, and the direction going around the central axis O in a plan view from the axial direction is referred to as the circumferential direction.

[0011] As shown in Fig. 1, the piping structure 1 of this embodiment is used in a multi-story building (building) 101. In the multi-story building 101, a plurality of layers 102 are stacked in the vertical direction. A floor slab 103 separates the layers 102 (i.e., upper floors and lower floors). The floor slab 103 has a through hole 103a that penetrates in the vertical direction.

[0012] The piping structure 1 has a collective joint 10 installed on a floor slab 103. The collective joint 10 has an upper connecting pipe 11 and a lower connecting pipe 12 connected to the upper connecting pipe 11. The upper connecting pipe 11 has a vertical pipe connecting part 13 connectable to the first vertical pipe P1, and a horizontal pipe connecting part 14 protruding from the side surface of the vertical pipe connecting part 13 and connectable to the horizontal pipe P3. The upper connecting pipe 11 is an integrally molded product. The upper end part of the upper connecting pipe 11 is connected to the first vertical pipe P1.

[0013] The lower connecting pipe 12 is located below the upper connecting pipe 11. The lower connecting pipe 12 has a connecting pipe portion 16, an inclined pipe portion 17, and a lower pipe portion . The connecting pipe section 16 is located near the upper end of the lower connecting pipe 12, and is connected to the lower part of the upper connecting pipe 11. The inclined pipe section 17 is located below the connecting pipe section 16, and gradually reduces in diameter as it extends downward from the connecting pipe section 16. That is, the lower connecting pipe 12 gradually narrows as it extends downward from the upper connecting pipe 11. The lower pipe section 18 extends downward from the lower end of the inclined pipe section 17, and is connected to the second vertical pipe P2. In this embodiment, the lower end of the connecting pipe portion 16 is spaced upward by a distance h from the floor slab 103. That is, the lower end of the connecting pipe portion 16 is located higher than the floor slab 103. The lower end of the connecting pipe portion 16 may be located at the same position as the upper surface of the floor slab 103.

[0014] The inclined pipe section 17 is located inside the through hole 103a. The outer peripheral surface of the inclined pipe section 17 is covered with a covering material 20. The covering material 20 may cover a part of the inclined pipe section 17 or may cover the entirety of the inclined pipe section 17. In this embodiment, the covering material 20 covers the outer peripheral surface of the inclined pipe section 17 all around. In the floor slab 103, mortar 104 is filled between the opening periphery of the through hole 103a and the covering material 20.

[0015] The upper connecting pipe 11 will be described below. The vertical pipe connection part 13 has a plurality of ribs 19 protruding radially outward at an upper end part thereof. In the illustrated example, four sets of three ribs 19 spaced apart from each other in the axial direction are provided, and four sets of three ribs 19 spaced apart from each other in the circumferential direction. The four sets of ribs 19 are disposed at equal intervals in the circumferential direction. The radial size of the ribs 19 is not particularly limited. When the collective joint 10 is installed in the multi-story building 101, a support bracket (not shown) abuts against the rib 19 from the outside in the radial direction, thereby holding the collective joint 10 in place.

[0016] The horizontal pipe connecting portion 14 extends radially outward from the peripheral wall of the vertical pipe connecting portion 13. In the illustrated example, three horizontal pipe connecting portions 14 are provided. Two of the three horizontal pipe connecting parts 14 are located radially on either side of the central axis O. The remaining horizontal pipe connecting part 14 extends in a radial direction that forms an angle of 90° in plan view with the respective extension directions of the two horizontal pipe connecting parts 14. Note that the horizontal pipe connecting parts 14 are not limited to this embodiment, and the number and extension direction of the horizontal pipe connecting parts 14 can be changed as desired. 2, horizontal section connecting pipes 15 to which the horizontal pipes P3 are respectively connected are attached to the radially outer ends of the horizontal pipe connecting parts 14. The outer diameter of the horizontal section connecting pipes 15 is larger than the outer diameter of the horizontal pipe connecting parts 14.

[0017] The upper connecting pipe 11 is, for example, a member integrally molded by injection molding or the like using a resin composition. Examples of resins constituting the resin composition include polyolefin resins such as polyethylene resins and polypropylene resins, ABS resins, polyvinyl chloride resins, etc., and polyvinyl chloride resins are preferred. "Polyolefin resin" refers to a resin containing polyolefin alone, or a resin containing multiple types of resins in which the majority of the resin is polyolefin. Similarly, "polyvinyl chloride resin" refers to a resin containing polyvinyl chloride alone, or a resin containing multiple types of resins in which the majority of the resin is polyvinyl chloride.

[0018] The upper connecting pipe 11 and the lower connecting pipe 12 in the collective joint 10 may or may not be transparent. By making them transparent, the connection state of the upper connecting pipe 11 and the lower connecting pipe 12 can be visually confirmed. In addition, the collective joint 10 may be blended with a flame retardant such as non-thermally expandable graphite or magnesium hydroxide.

[0019] The lower connecting pipe 12 will be described below. The outer diameter of the connecting pipe section 16 is equal to the outer diameter of the vertical pipe connecting section 13 of the upper connecting pipe 11. The outer diameter of the lower end of the inclined pipe section 17 is smaller than the outer diameter of the connecting pipe section 16. The axial size of the inclined pipe section 17 is larger than the axial size of the connecting pipe section 16.

[0020] The outer diameter of the lower pipe portion 18 is smaller than the outer diameter of the connecting pipe portion 16 and larger than the outer diameter of the lower end portion of the inclined pipe portion 17. The axial size of the lower pipe portion 18 is smaller than the axial size of the connecting pipe portion 16. The lower pipe portion 18 receives the second vertical pipe P2 from below and connects to the second vertical pipe P2.

[0021] The connecting pipe portion 16 contains a resin and a thermal expansion material. In this embodiment, the connecting pipe portion 16 is a thermal expansion member. For example, the connecting pipe portion 16 can be manufactured by extrusion molding a resin composition containing a resin and a thermal expansion material. Examples of resins that form the connection pipe portion 16 include polyolefin resins and polyvinyl chloride resins, and among these, polyvinyl chloride resins are preferable because polyvinyl chloride resins can more reliably block the pipe in the event of a fire. The thermal expansion material may be any material that expands due to heat generated during a fire, and an example of such a material is thermally expandable graphite.

[0022] The connecting pipe part 16 may have a single-layer structure in which the entire connecting pipe part 16 is made of a single resin composition, or may have a multi-layer structure made of multiple layers. When the connecting pipe part 16 has a multi-layer structure, any one of the layers may be formed from a resin composition containing a thermal expansion material. For example, when the connecting pipe part 16 has a three-layer structure consisting of a surface layer, an intermediate layer, and an inner layer, the intermediate layer may be formed from a resin composition containing a thermal expansion material.

[0023] The surface layer, intermediate layer and inner layer may contain a heat absorbing agent, for example, inorganic hydroxides such as magnesium hydroxide, aluminum hydroxide, kaolin minerals (kaolinite, halloysite, dickite) and hydrotalsalcite, and inorganic compounds having a water absorbing effect such as sepiolite, bentonite, montmorillonite, talc, mica, quartz, zeolite, wollastonite and nepheline syenite.

[0024] When the intermediate layer contains thermally expandable graphite, the intermediate layer is black in color, and therefore it is preferable that the surface layer and the inner layer contain a colorant other than black so as to be distinguishable from the intermediate layer. The thickness of the surface layer and the inner layer is preferably 0.3 mm to 3.0 mm, and more preferably 0.6 mm to 1.5 mm. If the thickness of the covering layer, which is the surface layer and the inner layer, is 0.3 mm or more, the mechanical strength of the connecting pipe part 16 as a pipe can be sufficiently ensured. If the thickness of the covering layer is 3.0 mm or less, the deterioration of the fire resistance of the connecting pipe part 16 can be suppressed. Moreover, it is preferable that the connection pipe portion 16 satisfies the performance requirements set forth in JIS K6741, rigid polyvinyl chloride pipe.

[0025] The connecting pipe section 16 may be formed of a resin composition that does not contain a thermal expansion material. In this case, a sheet-like fire-resistant material (hereinafter also referred to as a fire-resistant sheet) made of a resin containing a thermal expansion material is attached to the outer circumferential surface of the collective joint 10 between the lower end of the horizontal pipe connecting section 14 and the upper end of the inclined pipe section 17. The fire-resistant sheet is not limited to a soft sheet that does not retain its shape, and may be a sheet that is pre-formed into a semi-cylindrical or cylindrical shape and has the strength to retain the shape.

[0026] The distance h between the lower end of the connecting pipe portion 16 (i.e., the lower end of the thermal expansion member) and the upper surface of the floor slab 103 is preferably 60 mm or less, more preferably 45 mm or less, and even more preferably 30 mm or less. If the distance h is equal to or less than the above upper limit, the pipe line can be blocked more quickly in the event of a fire. The lower limit of the distance h is 0 mm (i.e., the lower end of the thermal expansion member and the upper surface of the floor slab 103 are at the same height).

[0027] The connecting pipe portion 16 may be molded integrally with the inclined pipe portion 17, or they may be molded separately and then connected together.

[0028] The inclined pipe portion 17 can be manufactured by, for example, injection molding a resin composition. The resin composition constituting the inclined pipe portion 17 is the same as the resin composition constituting the upper connecting pipe 11.

[0029] The lower pipe portion 18 can be manufactured by, for example, injection molding a resin composition. The resin composition constituting the lower pipe portion 18 is the same as the resin composition constituting the upper connecting pipe 11.

[0030] The inclined pipe portion 17 and the lower pipe portion 18 may be formed as a single unit, or may be formed separately and then connected together.

[0031] The upper connecting pipe 11 and the lower connecting pipe 12 are connected to each other by an adhesive or the like. In this embodiment, the collecting joint 10 has the upper connecting pipe 11 and the lower connecting pipe 12 , but the collecting joint 10 may have members other than the upper connecting pipe 11 and the lower connecting pipe 12 .

[0032] The coating material 20 is described below. In this embodiment, the covering material 20 is in direct contact with the outer circumferential surface of the inclined pipe section 17. However, the present invention is not limited to this, and other members that melt at approximately the same temperature as the inclined pipe section 17 in the event of a fire may be present between the inclined pipe section 17 and the covering material 20, as long as they do not impair the effects of the present invention.

[0033] The covering material 20 is not particularly limited as long as it is an aggregate of fibrous materials, and examples thereof include felts such as needle felt and thermal felt, glass wool, and rock wool. Among these, felt and glass wool are preferable, needle felt and glass wool are more preferable, and needle felt is even more preferable. These covering materials 20 can quickly block the pipe in the event of a fire.

[0034] Examples of fiber materials constituting the felt include polyester fibers such as polyethylene terephthalate, acrylic fibers such as acrylonitrile and acrylonitrile-vinyl chloride copolymer resin, polyamide fibers such as nylon and aramid, synthetic fibers such as polypropylene fibers, rayon fibers, and polyimide fibers, and wool. When the covering material 20 is composed of multiple fiber materials, it is preferable that the main component is one of polyester, acrylic resin, and polyamide from the viewpoint of heat resistance and strength. Here, being the main component means that the component has the largest mass and that the mass of that component is 35 mass% or more with respect to the total mass of the fibers constituting the covering material 20.

[0035] The coating material 20 may include an inorganic filler. Examples of inorganic fillers include silica, diatomaceous earth, alumina, zinc oxide, titanium oxide, calcium oxide, magnesium oxide, iron oxide, tin oxide, antimony oxide, ferrites, calcium hydroxide, magnesium hydroxide, aluminum hydroxide, basic magnesium carbonate, calcium carbonate, magnesium carbonate, zinc carbonate, barium carbonate, dawnnite, hydrotalcite, calcium sulfate, barium sulfate, gypsum fiber, calcium silicate, talc, clay, mica, montmorillonite, bentonite, activated clay, sepiolite, imogolite, sericite, glass fiber, glass beads, silica-based balloon, aluminum nitride, boron nitride, silicon nitride, carbon black, graphite, carbon fiber, carbon balloon, charcoal powder, various metal powders, potassium titanate, magnesium sulfate, lead zirconate titanate, aluminum borate, molybdenum sulfide, silicon carbide, stainless steel fiber, zinc borate, various magnetic powders, slag fiber, fly ash, and dewatered sludge. Among these, calcium carbonate and barium sulfate are preferably used as the inorganic filler in terms of the balance between weight and cost. These may be used alone as the inorganic filler, or two or more of them may be mixed and used as the inorganic filler. The content of the inorganic filler is preferably, for example, 300 to 3,000 parts by mass with respect to 100 parts by mass of the resin.

[0036] The coating material 20 preferably has a mass loss rate of 80% by mass or less in a heating test in which the coating material 20 is heated in a muffle furnace at 400°C for 1 hour and combusted. If the mass loss rate of the coating material 20 is 80% by mass or less, the coating material 20 has excellent fire resistance. The mass loss rate of the coating material 20 is calculated by the following formula (1), where W1 is the mass of the coating material 20 before combustion, W2 is the mass of the crucible used for heating, W3 is the sum of the masses of the coating material 20 and the crucible after combustion, and W4 is the mass of the coating material 20 after combustion. Mass reduction rate (%)=(W1-W4) / W1×100=(W1-(W3-W2)) / W1×100...(1) A muffle furnace is a furnace that has a partition (muffle) made of a refractory material with good thermal conductivity between the heat source or heating element and the firing chamber. It is also called an indirect flame furnace.

[0037] The covering material 20 may be preformed into any shape, or may not be preformed. An example of a preformed material is a sheet of felt that matches the shape and size of the inclined tube portion 17.

[0038] The density of the coating material 20 is, for example, 30 kg / m 3 More than 200kg / m 3 Less than 50kg / m is preferable. 3 More than 150kg / m 3 Less than 80kg / m is more preferable. 3 More than 120kg / m 3 The following is even more preferable. If the density of the covering material 20 is equal to or greater than the above-mentioned lower limit, the covering material 20 alone is likely to maintain its shape, and residue is likely to remain in the event of a fire, causing blockage. If the density of the covering material 20 is equal to or less than the above-mentioned upper limit, the fibers constituting the covering material 20 and the melted resin constituting the inclined pipe section 17 are quickly entangled in the event of a fire to form residue, allowing the pipe to be blocked more quickly. The thickness of the covering material 20 is preferably 3 mm to 20 mm, more preferably 4 mm to 15 mm, and even more preferably 5 mm to 10 mm. If the thickness of the covering material 20 is equal to or greater than the lower limit, the fire resistance can be further improved. If the thickness of the covering material 20 is equal to or less than the upper limit, the through hole 103a of the slab can be small, and the workability and fire resistance can be further improved. In this specification, the density of the felt is measured in accordance with the test method described in 6.7.1 (density measurement of artificial mineral fiber insulation) of JIS A 9521:2014 (thermal insulation materials for construction). The original size of the test piece is the entire covering material 20, and the test piece for density measurement is a square cut out of 100 mm square from the center part 10 mm or more inside from the periphery of the original size.

[0039] The tensile modulus of the covering material 20 is 5 to 500 kg / cm 2 If the tensile modulus of the covering material 20 is within the above range, the covering material 20 can be easily wound around the inclined tube portion 17.

[0040] A surface material such as a synthetic fiber nonwoven fabric or a glass fiber nonwoven fabric may be provided on one or both sides of the covering material 20. However, from the viewpoint of closing the pipeline more quickly in the event of a fire, it is preferable that the covering material 20 be in direct contact with the outer circumferential surface of the inclined pipe section 17.

[0041] An example of a method for fixing the covering material 20 to the outer peripheral surface of the inclined tubular section 17 is to wrap the covering material 20 around the inclined tubular section 17, overlap the ends, and fix the overlapped parts with adhesive tape. An example of the adhesive tape is a butyl rubber tape having adhesiveness and water-stopping properties. Instead of using adhesive tape, the ends of the covering material 20 may be bonded together with an adhesive. Also, both ends of the covering material 20 may be connected with a fastener or a hook-and-loop fastener, and the covering material 20 may be detachably fixed to the outer circumferential surface of the inclined tube portion 17.

[0042] In the piping structure 1 of this embodiment, the collective joint 10 penetrates the floor slab 103 and has a thermal expansion member (connecting pipe section 16) at a position equal to or higher than the upper surface of the floor slab 103 and lower than the horizontal pipe connection section 14. An inclined pipe section 17 is located inside the through hole 103a of the floor slab 103, and the outer peripheral surface of the inclined pipe section 17 is covered with a covering material 20. That is, in the piping structure 1 of this embodiment, the thermal expansion member is located above the floor slab 103, and the covering material 20 is located below it and within the floor slab 103. The piping structure 1 of the present embodiment has the above-mentioned configuration, and when a fire breaks out on a lower floor, the fire spreads to the second vertical pipe P2, or the flame or hot air tries to rise to the upper floor through the second vertical pipe P2. At this time, the connecting pipe section 16 is heated, and when the thermal expansion material reaches the expansion temperature, the connecting pipe section 16 expands and acts to block the internal duct. In addition, the connecting pipe section 16 and the inclined pipe section 17 are softened or melted by the heat, and the resin constituting the connecting pipe section 16 and the inclined pipe section 17 approaches the lower end of the through hole 103a while entangling with the covering material 20. Therefore, the duct of the piping structure 1 can be quickly and reliably blocked in the through hole 103a.

[0043] Second Embodiment A piping structure according to a second embodiment of the present invention will be described with reference to FIG. The piping structure 2 in FIG. 2 has a collective joint 10 that penetrates a floor slab 103 and a cover 21 that covers the outer peripheral surface of the collective joint 10. The cover 21 covers the outer peripheral surfaces of the upper connecting pipe 11 and the lower connecting pipe 12 of the collective joint 10. The cover 21 has a covering material 20a that is wrapped around the collective joint 10 from the outside in the radial direction to cover the entire collective joint 10, and a cover sheet 22 that covers the covering material 20a. The covering material 20a surrounds the outer peripheral surface of the vertical pipe connecting portion 13, the outer peripheral surface of the connecting pipe portion 16, the outer peripheral surface of the inclined pipe portion 17, and the outer peripheral surface of the lower pipe portion 18. In this embodiment, the covering material 20a covers the entire outer peripheral surfaces of the vertical pipe connecting portion 13, the connecting pipe portion 16, the inclined pipe portion 17, and the lower pipe portion 18.

[0044] The covering material 20a is the same as the covering material 20 in the first embodiment. The covering material 20a may be an integrally molded product or may be made of two or more members. When the covering material 20a is made of two or more members, for example, the covering material 20a may be made of a first piece covering the outer circumferential surface of the vertical pipe connection portion 13, a second piece covering the outer circumferential surface of the connection pipe portion 16, and a third piece covering the inclined pipe portion 17 and the lower pipe portion 18.

[0045] The cover sheet 22 covers the outer peripheral surface of the covering material 20a. The cover sheet 22 may be a one-piece molded product or may be made of two or more members. When the cover sheet 22 is made of two or more members, it may be made of members corresponding to the first piece, the second piece, and the third piece of the covering material 20a.

[0046] The cover sheet 22 may be, for example, a resin sheet of polyolefin such as polypropylene or polyethylene, etc. The cover sheet 22 may be, for example, a sheet formed from a resin composition containing 300 to 3000 parts by mass of inorganic filler per 100 parts by mass of a base resin such as polyolefin, etc.

[0047] Examples of inorganic fillers include silica, diatomaceous earth, alumina, zinc oxide, titanium oxide, calcium oxide, magnesium oxide, iron oxide, tin oxide, antimony oxide, ferrites, calcium hydroxide, magnesium hydroxide, aluminum hydroxide, basic magnesium carbonate, calcium carbonate, magnesium carbonate, zinc carbonate, barium carbonate, dawnnite, hydrotalcite, calcium sulfate, barium sulfate, gypsum fiber, calcium silicate, talc, clay, mica, montmorillonite, bentonite, activated clay, sepiolite, imogolite, sericite, glass fiber, glass beads, silica-based balloon, aluminum nitride, boron nitride, silicon nitride, carbon black, graphite, carbon fiber, carbon balloon, charcoal powder, various metal powders, potassium titanate, magnesium sulfate, lead zirconate titanate, aluminum borate, molybdenum sulfide, silicon carbide, stainless steel fiber, zinc borate, various magnetic powders, slag fiber, fly ash, and dewatered sludge. Among these inorganic fillers, calcium carbonate and barium sulfate are preferably used in terms of the balance between the blending amount and the cost. These inorganic fillers may be used alone or in combination of two or more.

[0048] The tensile modulus of the cover sheet 22 is 5 to 500 kg / cm 2 If the tensile modulus of elasticity is within the above range, it is easier to wrap the cover sheet 22 around the collective joint 10. The tensile modulus of elasticity of the cover sheet 22 is preferably 100 kg / cm 2 At this level, the cover sheet 22 is neither too soft nor too hard and is easy to wrap. A surface material such as synthetic fiber nonwoven fabric or glass fiber nonwoven fabric may be laminated on one or both sides of the cover sheet 22 .

[0049] According to this embodiment, installation is easy because the covering material 20a is covered with the cover sheet 22. In addition, the covering material 20a and the collective joint 10 can be more closely attached. Furthermore, because the covering material 20a, which is an assembly of fibrous materials, covers the entire collective joint, sound generated when water flows through the pipeline is less likely to leak to the outside.

[0050] (Third embodiment) A piping structure according to a third embodiment of the present invention will be described with reference to the drawings. The piping structure 3 in FIG. 3 has a collective joint 10 that penetrates a floor slab 103 and a cover 21 that covers the outer peripheral surface of the collective joint 10. The cover 21 covers the outer peripheral surfaces of the assembly joint 10 from below the horizontal pipe connection portion 14 to the connection pipe portion 16 and the inclined pipe portion 17. A vertical rib 30 extending in the up-down direction is provided inside the vertical pipe connecting portion 13 of the upper connecting pipe 11. The vertical rib 30 is formed so as to avoid the base end opening of the horizontal pipe connecting portion 14. A current plate 32 extending in the vertical direction is provided inside the inclined pipe portion 17. In this embodiment, the piping structure 3 may or may not have the current plate 32. In this embodiment, the connection pipe portion 16 is located above the lower end of the covering material 20a. That is, the thermal expansion member is located above the covering material.

[0051] 4 is an enlarged view of the region S. As shown in FIG. 4, the upper end of the cover 21 is joined to the vertical pipe connecting portion 13 by an adhesive tape 23. The upper end of the covering material 20a and the upper end of the cover sheet 22 are spaced apart from the lower end of the base end of the horizontal pipe connection portion 14 (hereinafter, sometimes referred to as the "lower end of the horizontal pipe connection portion"). In addition, the upper end of the covering material 20a is located lower than the upper end of the cover sheet 22. As a result, the upper end of the covering material 20a protrudes from the upper end of the cover sheet 22. The adhesive tape 23 is adhered to the upper end of the cover sheet 22, the exposed covering material 20a, and the outer surface of the upper connecting pipe 11. With this configuration, the adhesive tape 23 can more reliably adhere the covering material 20a to the outer surface of the vertical pipe connecting portion 13. When the covering material 20a is in close contact with the outer surface of the vertical pipe connecting portion 13, the pipeline of the piping structure 3 can be blocked more quickly and more reliably in the event of a fire breaking out on a lower floor.

[0052] The adhesive tape 23 is preferably applied to an area including the position of the lower end of the vertical rib 30. The area where the vertical rib 30 is located has high rigidity, and the distortion of the vertical pipe connection part 13 is small in the area where the vertical rib 30 is located. Therefore, by adhering the adhesive tape 23 to the area where the vertical rib 30 is located, it is possible to prevent a gap from being generated between the adhesive tape 23 and the vertical pipe connection part 13 and to prevent the adhesive tape 23 from peeling off from the vertical pipe connection part 13. This makes it possible to more quickly and reliably block the piping of the piping structure 3 in the event of a fire on a lower floor, and also to prevent water from entering between the covering material 20a and the vertical pipe connection part 13.

[0053] The distance D from the lower end of the horizontal pipe connecting portion 14 to the upper end of the cover sheet 22 is, for example, preferably 5 mm or more, more preferably 10 mm or more, and even more preferably 20 mm or more. If the distance D is equal to or more than the above-mentioned lower limit, a sufficient area for adhering the adhesive tape 23 in the upper connecting pipe 11 can be secured, thereby improving the adhesion of the covering material 20a to the vertical pipe connecting portion 13. The upper limit of the distance D is not particularly limited, but if it is desired to bring the upper end of the cover 21 closer to the horizontal pipe connecting portion 14, for example, 30 mm or less is preferable.

[0054] The distance D1 from the upper end of the adhesive tape 23 to the upper end of the covering material 20a is, for example, preferably 3 to 20 mm, and more preferably 5 to 15 mm. If the distance D1 is equal to or greater than the above-mentioned lower limit, the adhesive tape 23 can be more firmly adhered to the vertical pipe connection portion 13. If the distance D1 is equal to or less than the above-mentioned upper limit, the cover 21 can be brought closer to the horizontal pipe connection portion 14.

[0055] The distance D2 from the top end of the covering material 20a to the top end of the cover sheet 22 (i.e., the length of the covering material 20a protruding from the cover sheet 22) is, for example, preferably 3 to 30 mm, more preferably 8 to 25 mm, and even more preferably 5 to 15 mm. If the distance D2 is equal to or greater than the above lower limit, the contact area between the adhesive tape 23 and the covering material 20a increases, and the covering material 20a and the adhesive tape 23 can be firmly bonded to each other. If the distance D2 is equal to or less than the above upper limit, there is no need to make the width of the adhesive tape 23 excessively wide.

[0056] In this embodiment, the upper connecting pipe 11 is exposed, but the upper connecting pipe 11 may be covered with another cover 21. In this case, the other cover 21 preferably covers the adhesive tape 23 in Fig. 3. That is, the lower end of the other cover 21 is preferably located lower than the upper end of the cover 21 in Fig. 3.

[0057] Next, a method for joining the cover 21 in this embodiment will be described. 5(a), the cover 21 is wrapped around the outer surface of the vertical pipe connection part 13. At this time, the covering material 20a is abutted against the outer surface of the vertical pipe connection part 13, and the upper end of the covering material 20a is brought closer to the horizontal pipe connection part 14 than the upper end of the cover sheet 22. Next, as shown in FIG. 5( b ), the adhesive tape 23 is brought into contact with the upper end of the cover sheet 22 , the covering material 20 a , and the outer surface of the vertical pipe connecting portion 13 , and is wrapped around the vertical pipe connecting portion 13 . In this manner, the cover 21 is joined to the upper connecting pipe 11 .

[0058] (Other embodiments) In the first embodiment, there is no cover sheet covering the dressing material, but the present invention is not limited to this, and the first embodiment may also have a cover sheet covering the dressing material.

[0059] In the first and second embodiments, the collective joint has three horizontal pipe connecting portions, but the present invention is not limited to this, and the number of horizontal pipe connecting portions may be two or less, or four or more.

[0060] In the first and second embodiments, the connecting pipe portion and the inclined pipe portion, which are the thermal expansion member, are adjacent to each other in the vertical direction, but the present invention is not limited to this, and the thermal expansion member and the inclined pipe portion may be spaced apart in the vertical direction. However, from the viewpoint of more quickly closing the pipeline, it is preferable that the thermal expansion member and the inclined pipe portion are adjacent to each other or close to each other in the vertical direction. When the thermal expansion member and the inclined pipe portion are close to each other in the vertical direction, the distance between them is preferably 40 mm or less.

[0061] In the first and second embodiments, the covering material covers the entire outer circumferential surface of the inclined tubular portion, but the present invention is not limited to this, and the covering material may cover only a part of the outer circumferential surface of the inclined tubular portion.

[0062] In the above-described embodiment, when the tube axis O is set to the vertical direction, the horizontal tube connection portion extends in the horizontal direction. The present invention is not limited to this, and the horizontal pipe connection portion may be bent obliquely upward. For example, the piping structure 4 shown in Fig. 6 has a horizontal pipe connection portion 14a bent diagonally upward. By having the horizontal pipe connection portion 14a bent diagonally upward, it is possible to connect to a horizontal pipe P3' located away from the upper surface of the floor slab 103.

[0063] In addition, the piping structure 4 has a branch floating member 40 between the vertical pipe connection portion 13 and the connecting pipe portion 16. The branch floating member 40 is a pipe that connects the vertical pipe connection portion 13 and the connecting pipe portion 16. By having the branch floating member 40, the piping structure 4 can be connected to a horizontal pipe P3' that is located away from the upper surface of the floor slab 103.

[0064] Furthermore, the piping structure 4 may have a straightening plate 42 extending in the vertical direction within the inclined pipe portion 17. By having the straightening plate 42, for example, the drainage speed within the piping structure 4 can be further increased.

[0065] The piping structure of the present invention may have only any one of the horizontal pipe connection portion 14a, the branch floating member 40 and the straightening plate 42, may have all of them, or may have none of them.

[0066] The piping structure of the present invention may have a mark for positioning. For example, in the piping structure 5 of Fig. 7, the entirety of the collective joint 10 is covered with a cover 21. At the position of the inclined pipe section 17 of the piping structure 5, a band 120 is formed around the inclined pipe section 17. The band 120 is spaced downward from the lower end of the connecting pipe section 16 (i.e., the boundary between the connecting pipe section 16 and the inclined pipe section 17). The upper end of the band 120 is located within the floor slab when the piping structure 5 is installed within the floor slab. This allows the piping structure 5 to be installed without the connecting pipe section 16, which is a thermal expansion member, being too far from the floor slab. The band 120 may be any material that can be distinguished from the base (the cover 21 in this embodiment). Examples of the band 120 include a tape with a color tone different from that of the base, a printed layer, and unevenness provided on the surface of the cover 21 that is integral with the cover 21. [Explanation of symbols]

[0067] 1, 2, 3, 4 Piping structure 10. Collective Joint 11 Upper connecting pipe 12 Lower connecting pipe 15 Horizontal connecting pipe 16 Connection pipe section 17 Inclined pipe section 18 Lower pipe section 20, 20a Covering material 103 Floor Slab

Claims

1. The cover has a resin assembly joint and an inner layer made of a coating material that is an assembly of fibrous materials, The manifold includes an upper connecting pipe, a lower connecting pipe located below the upper connecting pipe, and a branch floating member disposed between the upper connecting pipe and the lower connecting pipe, the upper connecting pipe has a vertical pipe connecting portion and a horizontal pipe connecting portion, the lower connecting pipe has an inclined pipe portion that gradually narrows downward from the upper connecting pipe, and a lower pipe portion located below the inclined pipe portion, The lower end of the upper connecting pipe is inserted into the upper end of the branch floating member, The lower end of the branch floating member is inserted into the upper end of the lower connecting pipe, The cover covers a part or all of the outer peripheral surface of the inclined pipe portion.

2. 2. The piping structure according to claim 1, wherein the covering material is any one of felt, glass wool, and rock wool.

3. A piping structure as described in claim 1 or 2, in which a thermal expansion material is attached to the outer peripheral surface between the lower end of the horizontal pipe connection section and the upper end of the inclined pipe section.

4. A band is formed on the outer surface of the cover, The band is a tape having a different color tone from the cover, a printed layer, or a concave-convex portion integral with the cover. The piping structure according to any one of claims 1 to 3.

5. A piping structure as described in Claim 4, wherein the band is buried inside a floor slab.

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