JP5485792B2 - Drainage pipe fitting - Google Patents

Description

  The present invention relates to a drain pipe joint.

  Conventionally, there is a structure that allows piping means to pass through various sections such as a floor that partitions an upper layer and a lower layer in a multi-layered building and a wall that partitions adjacent spaces (Patent Document 1). In the case where such a partition penetrating portion is a fire prevention section, a structure is required so that when a fire occurs in one space partitioned by the section, the flame does not enter the other space.

  That is, when a water supply pipe, distribution pipe or other pipe penetrates a floor or wall of a fireproof structure, the gap between the pipe and the fireproof section of a semi-fireproof structure must be filled with mortar or other nonflammable material. In addition, it is supposed that the parts that pass through distribution pipes and other pipes and the parts that are within a distance of 1 m on each side from the penetrating parts are made of non-combustible materials (see the Building Standards Law Enforcement Ordinance).

  Therefore, in the penetration part of the floor slab which is a fire prevention section which divides each floor of the multi-layered building, a metal collective joint is used and connected to the vertical pipe connection part and the side branch pipe connection part above and below the collective joint. For the vertical pipe and the horizontal branch pipe, a resin-lined steel pipe having excellent fire resistance, a fire-resistant double-layer pipe (having a fiber-reinforced mortar layer around the resin pipe), a metal pipe, and the like are used.

  However, when a metal pipe is used, there is a problem that it is heavy and has a problem in workability, and is poor in soundproofing effect of drainage sound. On the other hand, in the case of a fireproof two-layer pipe, it is lighter than a metal pipe and has a high soundproofing effect on drainage sound, but there is a problem that the mortar layer breaks and there is a problem in handling. On the other hand, resin-lined steel pipes are lighter than metal pipes, have high soundproofing of drainage sound, and are easy to handle, but they are expensive compared to resin-only piping materials. There's a problem.

Therefore, a plurality of synthetic resin joint constituent members are assembled, and among the plurality of joint constituent members, at least the joint constituent members constituting the slab penetrating portion have a tubular fire resistance made of a fire-resistant and heat-expandable resin composition. A drainage pipe joint formed of a fireproof and heat-expandable resin pipe having an expansion layer has already been proposed by the applicant of the present invention (Patent Document 1).
In this drain pipe joint, all the joint constituent members are made of synthetic resin, so that it is lightweight and excellent in handleability, and the joint constituent members constituting the slab penetration part are formed of a fire-resistant and heat-expandable resin pipe. Therefore, in the event of a fire, the expanded graphite of the refractory and heat-expandable resin pipe is thermally expanded and the pipe is closed, and a seal with the mortar can be secured, resulting in excellent fire resistance.

JP 2009-040940 A

  However, the above-described drainage pipe joint previously proposed by the applicant is superior as described above, but has some problems in terms of sound insulation.

  In view of the above circumstances, an object of the present invention is to provide a drainage pipe joint that is lightweight, has good workability, and is excellent not only in fire resistance but also in sound insulation.

  In order to achieve the above object, the inventors of the present invention formed a joint body by connecting and integrating joint members similar to those in Patent Document 1, and the periphery of the joint body, in particular, through the floor slab. If a sound insulation resin sheet is wound around the joint components constituting the part, the drain pipe joint not only has light weight, good workability, and excellent fire resistance, but also excellent sound insulation. I thought I could do it.

However, when the above sound insulation resin sheet is wound, depending on the thing, when a fire experiment is performed, a gap is generated between the mortar and the joint in the floor slab penetration part, and the incineration or smoke flows into the upper floor. Sometimes it could not be prevented sufficiently.
Therefore, as a result of repeated studies by the inventors of the present invention, a sound insulation resin sheet is obtained by calendering, the resin is oriented in the rolling direction by rolling during production, and the sound insulation resin sheet is obtained by heating during a fire. It was found that this was caused by heat shrinkage in the rolling direction, and the present invention was completed.

That is, the drain pipe joint according to the present invention is formed by assembling a plurality of joint constituent members, and among the plurality of joint constituent members, a joint constituent member constituting at least a part of the floor slab penetrating portion is refractory thermal expansion. A drainage pipe joint used in a floor slab penetrating portion formed of a fireproof and thermally expandable resin pipe having at least a fireproof expansion layer having a tubular shape made of a heat-resistant resin composition,
Around the joint of the fire-resistant and heat-expandable resin pipe constituting the floor slab penetrating portion, or the joint portion of the fire-resistant and heat-expandable resin pipe and other joint components that form the floor slab penetrating portion together with the fire-resistant and thermally expandable resin pipe The sound insulation cover is wound around the joint body so that the heat shrink direction of the sound insulation resin sheet is parallel to the central axis of the floor slab penetrating portion. It is characterized by being formed.

In the drain pipe joint of the present invention, the sound insulation resin sheet is not particularly limited as long as the sound insulation performance can be improved by winding, but the fireproof and thermally expandable resin pipe and other joint components are more firmly fixed. Therefore, it is preferable to have a structure wound so as to straddle the fire-resistant and heat-expandable resin pipe and other joint constituent members joined to the fire-resistant and heat-expandable resin pipe.
In addition, the sound insulation resin sheet is not particularly limited as long as the sound insulation property can be improved. For example, a commercially available sound insulation sheet generally used for enhancing the sound insulation property of a building wall can be used. It is made of a synthetic resin so that the surface layer made of a soft vinyl chloride resin sheet with self-extinguishing properties and the plasticizer contained in the soft vinyl chloride resin sheet do not adversely affect the fire-resistant and heat-expandable resin pipe side. A laminate provided with a back surface layer made of a nonwoven fabric is preferred.
Moreover, in the resin composition which comprises a sound insulation resin sheet, in order to improve sound insulation performance, fillers, such as iron powder, may be disperse-mixed.
It does not specifically limit as said nonwoven fabric, For example, the thing made from polyester is mentioned.

  The thickness of the sound insulating resin sheet is not particularly limited, but it is preferably as thin as possible for weight reduction as long as the required sound insulating properties can be secured.

In the present invention, the fire-resistant and heat-expandable resin pipe is composed of a fire-resistant and thermally expandable resin composition containing 1 to 10 parts by weight of thermally expandable graphite with respect to 100 parts by weight of the polyvinyl chloride resin. A layer having a single layer structure, or a fire-resistant and thermally expandable resin pipe containing 1 to 15 parts by weight of thermally expandable graphite with respect to 100 parts by weight of a polyvinyl chloride resin What has a three-layer structure comprising a fireproof expansion layer made of a composition and a coating layer made of a polyvinyl chloride resin composition containing no thermally expandable graphite provided so as to cover the inner and outer surfaces of the fireproof expansion layer preferable.
Examples of the polyvinyl chloride resin include: a polyvinyl chloride homopolymer; a copolymer of a vinyl chloride monomer and a monomer having an unsaturated bond copolymerizable with the vinyl chloride monomer; ) A graft copolymer obtained by graft copolymerizing vinyl chloride with a polymer may be used, and these may be used alone or in combination of two or more. Further, the polyvinyl chloride resin may be chlorinated as necessary.

  The monomer having an unsaturated bond copolymerizable with the vinyl chloride monomer is not particularly limited, and examples thereof include α-olefins such as ethylene, propylene, and butylene; vinyl esters such as vinyl acetate and vinyl propionate; butyl Vinyl ethers such as vinyl ether and cetyl vinyl ether; (meth) acrylic acid esters such as methyl (meth) acrylate, ethyl (meth) acrylate and butyl acrylate; aromatic vinyls such as styrene and α-methylstyrene; N-phenylmaleimide N-substituted maleimides such as N-cyclohexylmaleimide and the like may be used, and these may be used alone or in combination of two or more.

  The polymer for graft copolymerization with vinyl chloride is not particularly limited as long as it is for graft copolymerization with vinyl chloride. For example, ethylene-vinyl acetate copolymer, ethylene-vinyl acetate-carbon monoxide copolymer Polymer, ethylene-ethyl acrylate copolymer, ethylene-butyl acrylate-carbon monoxide copolymer, ethylene-methyl methacrylate copolymer, ethylene-propylene copolymer, acrylonitrile-butadiene copolymer, polyurethane, chlorinated polyethylene, A chlorinated polypropylene etc. are mentioned, These may be used independently and 2 or more types may be used together.

  The average degree of polymerization of the polyvinyl chloride-based resin is not particularly limited. However, when it becomes smaller, the physical properties of the molded body are lowered, and when it becomes larger, the melt viscosity becomes higher and molding becomes difficult. Preferably, 600-1400 is particularly preferable. The average degree of polymerization refers to a resin obtained by dissolving a polyvinyl chloride resin in tetrahydrofuran (THF), removing insoluble components by filtration, and then removing THF in the filtrate by drying. It means the average degree of polymerization measured according to -6721 “Testing method of vinyl chloride resin”.

  The polymerization method of the polyvinyl chloride resin is not particularly limited, and any conventionally known polymerization method may be employed, and examples thereof include a bulk polymerization method, a solution polymerization method, an emulsion polymerization method, and a suspension polymerization method. It is done.

  The method for chlorinating the polyvinyl chloride resin is not particularly limited, and a conventionally known chlorination method may be employed, and examples thereof include a thermal chlorination method and a photochlorination method.

  Any of the above polyvinyl chloride resins may be cross-linked or modified within a range not impairing the fire resistance performance of the resin composition. In this case, a resin that has been cross-linked or modified in advance may be used. When an additive or the like is blended, it may be cross-linked or modified at the same time, or it may be cross-linked or modified after the above components are blended in the resin. . There is no particular limitation on the crosslinking method of the resin, and a conventional crosslinking method of polyvinyl chloride resin, for example, crosslinking using various crosslinking agents, peroxides, crosslinking by electron beam irradiation, water crosslinkable material is used. And the like.

  The fire-resistant and heat-expandable resin pipe of the present invention has only a fire-resistant expansion layer as long as the fire-resistant expansion layer expands when heated by a flame or the like and can close or close the inside of the pipe. Even in the case of a single layer, a multi-layer structure in which a resin layer made of a resin composition not containing expanded graphite is provided on the inner and outer surfaces of the fire resistant expansion layer within a range not impairing the fire resistance performance of the fire resistant expansion layer.

  In the case of the single-layer structure product, the fire-resistant and heat-expandable resin composition for forming the fire-resistant and expandable layer is not particularly limited, but 1 to 10 weights of thermally expandable graphite with respect to 100 parts by weight of the polyvinyl chloride resin. What is contained in the ratio of a part is preferable, What is contained in the ratio of 1-8 weight part is more preferable, What is contained in the ratio of 2-7 weight part is further more preferable. That is, if the thermal expansive graphite is less than 1 part by weight, sufficient thermal expansibility may not be obtained at the time of combustion, and the desired fire resistance may not be obtained. If it expands too much, its shape cannot be maintained and the residue falls off, which may reduce the fire resistance.

On the other hand, in the case of a multilayer structure product, the fire-resistant and heat-expandable resin composition for forming the fire-resistant and expandable layer is not particularly limited, but the heat-expandable graphite is 1 to 15 with respect to 100 parts by weight of the polyvinyl chloride resin. What is contained in the ratio of a weight part is preferable, What is contained in the ratio of 1-12 weight part is more preferable, What is contained in the ratio of 2-10 weight part is further more preferable. That is, if the thermally expandable graphite is less than 1 part by weight of the thermally expandable graphite, sufficient thermal expansion cannot be obtained at the time of combustion, and desired fire resistance cannot be obtained. Due to the thermal expansion, the shape cannot be maintained and the residue falls off, which may reduce the fire resistance.
Further, as described above, the fire-resistant expansion layer is formed of a fire-resistant and heat-expandable resin composition containing 1 to 15 parts by weight of thermally expandable graphite with respect to 100 parts by weight of the polyvinyl chloride resin. In the case of a product, it is preferable to have a three-layer structure in which the inner and outer surfaces of the fireproof expansion layer are coated with a polyvinyl chloride resin composition that does not contain a heat-expandable fireproof material.

In the case of a multilayer structure product having a three-layer structure as described above, the thickness of the coating layer covering the inner surface and the outer surface of the refractory tube is preferably 0.2 to 2.0 mm.
That is, if the thickness of the coating layer covering the inner and outer surfaces of the fireproof expansion layer is less than 0.2 mm, the mechanical strength as a tube may be inferior, and if it exceeds 2.0 mm, the fire resistance may be reduced. .

The thermally expandable graphite used in the present invention is a powder of natural scale-like graphite, pyrolytic graphite, quiche graphite or the like, and an inorganic acid such as concentrated sulfuric acid, nitric acid or selenic acid, concentrated nitric acid, perchloric acid, perchlorate, perchlorate. With a strong oxidizer such as manganate, dichromate, hydrogen peroxide, etc., after the acid treatment to insert an inorganic acid between the graphite layers, the layer structure of carbon obtained by adjusting the pH is maintained. It is preferable to use a thermally expandable graphite which is a crystalline compound and adjusted to pH 1.5 to 4.0 and a heat expandable graphite having a 1.3 times expansion temperature of 180 ° C. to 240 ° C.
That is, if the pH of the heat-expandable graphite is less than 1.5, the acidity is too strong to easily cause corrosion of the molding apparatus. If the pH exceeds 4.0, the effect of promoting the carbonization of the polyvinyl chloride resin There is a risk that the fire resistance may be reduced and sufficient fire resistance may not be obtained.

  The pH adjustment method of the thermally expandable graphite is not particularly limited, but normally, in the state of acid treatment that inserts an inorganic acid between the layers of the raw graphite as described above, the pH is 1 or less. There is a method in which the graphite after acid treatment is washed with water to remove the acid remaining on the surface of the graphite and then dried. That is, in order to increase the pH of the thermally expandable graphite, water washing and drying may be repeated.

On the other hand, if the expansion temperature of the heat-expandable graphite is less than 180 ° C, the heat-expandable graphite may expand during molding, which causes poor appearance of the tube and fire resistance during combustion. When the 1.3 times expansion temperature of the thermally expandable graphite exceeds 240 ° C., there is no possibility that the expansion of the thermally expandable graphite will start during molding. After the thermal decomposition (foaming) of the polyvinyl chloride resin progresses and the flexibility of the polyvinyl chloride resin decreases, the thermally expandable graphite expands. There is a risk that it will not be able to withstand the expansion of the graphite and will collapse apart.
The 1.3 times expansion temperature is a temperature at which the expansion ratio of the thermally expandable graphite after heating the sample of the thermally expandable graphite for 30 minutes with the inside of the heating furnace becomes a constant temperature is 1.3 or more. means. Further, the expansion ratio can be obtained by dividing the volume of the sample after heating by the volume of the sample before heating.

  Although the particle diameter of the said thermally expansible graphite is not specifically limited, Preferably it is 100-400 micrometers, More preferably, it is 120-350 micrometers. That is, if the particle size becomes too fine, the expansion rate of the refractory resin composition may be reduced. On the other hand, if the particle size becomes too large, the structure expands too much due to heating, the shape cannot be maintained, the residue falls off, the fire resistance decreases, and the fire resistant resin composition is used as a piping material. The physical properties, such as tensile strength and flat strength, are reduced, and the mechanical strength required for the tube material may not be obtained.

In addition, the fire-resistant and heat-expandable resin composition for forming the fire-resistant expansion layer has a stabilizer, an inorganic filler, a flame retardant, a lubricant, a processing aid, an impact modifier, and the like within a range not impairing the object of the present invention. Additives such as a quality agent, a heat resistance improver, an antioxidant, a light stabilizer, an ultraviolet absorber, a pigment, a plasticizer, and a thermoplastic elastomer may be added.
The stabilizer is not particularly limited, and examples thereof include lead stabilizers, organotin stabilizers, higher fatty acid metal salts, and the like, and these can be used alone or in combination.

Examples of lead stabilizers include lead white, basic lead sulfite, tribasic lead sulfate, dibasic lead phosphite, dibasic lead phthalate, tribasic lead maleate, silica gel coprecipitated silicic acid. Lead, dibasic lead stearate, lead stearate, lead naphthenate are mentioned.
Examples of the organotin stabilizer include mercaptides such as dibutyltin mercapto, dioctyltin mercapto, and dimethyltin mercapto; And carboxylates such as dibutyltin mercaptodibutyltin laurate and dibutyltin laurate polymer.

  Examples of higher fatty acid metal salts (metal soaps) include lithium stearate, magnesium stearate, calcium stearate, calcium laurate, calcium ricinoleate, strontium stearate, barium stearate, barium laurate, barium ricinoleate, and stearic acid. Cadmium, cadmium laurate, cadmium ricinoleate, cadmium naphthenate, cadmium 2-ethylhexoate, zinc stearate, zinc laurate, zinc ricinoleate, zinc 2-ethylhexoate, lead stearate, lead dibasic stearate, naphthene Lead acid is mentioned.

The blending ratio of the stabilizer is not particularly limited, but is preferably 0.3 to 5.0 parts by weight with respect to 100 parts by weight of the polyvinyl chloride resin.
That is, if the blending ratio of the stabilizer is less than 0.3 parts by weight, it is difficult to ensure the thermal stability of the polyvinyl chloride resin at the time of molding, and there is a possibility that carbide is likely to be produced during molding. If the amount exceeds 0.0 parts by weight, the promotion of carbonization of the polyvinyl chloride resin during combustion may be hindered and sufficient fire resistance may not be obtained.

The inorganic filler is not particularly limited. For example, 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, Dawnite, 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 balun, aluminum nitride, boron nitride, silicon nitride, carbon black, graphite, carbon fiber, carbon balun, charcoal powder, various metals Candidates include 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, dehydrated sludge, etc. Of these, basic inorganic fillers such as calcium carbonate, calcium silicate, calcium hydroxide, calcium oxide, magnesium carbonate, magnesium hydroxide, magnesium oxide, barium carbonate, aluminum hydroxide, zinc oxide, zinc hydroxide and iron oxide Is preferably used.
These may be used alone or in admixture of two or more.

  The blending ratio of the inorganic filler is not particularly limited, but is preferably 0.3 to 50 parts by weight with respect to 100 parts by weight of the polyvinyl chloride resin, and 2 to 5 parts by weight. It is preferable. That is, when the inorganic filler is less than 0.3 parts by weight, the aggregate function is not performed during combustion, and the shape cannot be maintained, and the residue may fall off, resulting in a decrease in fire resistance. If the amount exceeds 50 parts by weight, the ratio of the polyvinyl chloride resin to the whole composition becomes low, so that the tensile strength may be lowered.

  In particular, when using the heat-expandable graphite whose pH is adjusted to 1.5 to 4.0, the basic inorganic filler is added to 0.3 to 100 parts by weight of the polyvinyl chloride resin. It is preferable to mix | blend in the ratio of 5.0 weight part. That is, when the blending ratio of the basic inorganic filler is less than 0.3 parts by weight with respect to 100 parts by weight of the polyvinyl chloride resin, the thermal stability of the polyvinyl chloride resin at the time of molding cannot be secured, and molding is performed. If the basic compound exceeds 5.0 parts by weight, the promotion of carbonization of the polyvinyl chloride resin during combustion may be hindered, and the fire resistance may not be significantly improved. There is.

  The flame retardant is not particularly limited as long as it is for enhancing flame retardancy during combustion. For example, hydroxides such as aluminum hydroxide and magnesium hydroxide, hydrotalcite, antimony dioxide, and antimony trioxide. Antimony oxides such as antimony pentoxide, molybdenum compounds such as molybdenum trioxide, molybdenum disulfide, ammonium molybdate, bromine compounds such as tetrabromobisphenol A, tetrabromoethane, tetrabromoethane, tetrabromoethane, triphenylphosphine Phosphorus compounds such as phosphate and ammonium polyphosphate, calcium borate, zinc borate and the like can be mentioned, but antimony trioxide is particularly preferable as a combustion suppressing effect of polyvinyl chloride. This is because the antimony compound has a very strong synergistic effect in producing a halogenated antimony compound under high temperature conditions and suppressing the combustion cycle in the presence of a halogen compound.

  By using a flame retardant in combination, the heat insulation effect due to the expansion of the thermally expandable graphite and the combustion delay effect due to the flame retardant exhibit a synergistic effect during combustion, and the fire resistance can be improved more efficiently. The number of added flame retardants is not particularly limited, but it is preferably 1 to 20 parts by weight with respect to 100 parts by weight of the polyvinyl chloride resin. If the flame retardant is less than 1 part by weight, it is difficult to obtain a sufficient synergistic effect, and if the flame retardant is added in excess of 20 parts by weight, the moldability and physical properties may be significantly reduced. is there.

  The heat stabilization aid is not particularly limited, and examples thereof include epoxidized soybean oil, phosphate ester, polyol, hydrotalcite, and zeolite. These may be used alone or in combination of two or more.

Examples of the lubricant include an internal lubricant and an external lubricant.
The internal lubricant is used for the purpose of lowering the flow viscosity of the molten resin during molding and preventing frictional heat generation. The internal lubricant is not particularly limited, and examples thereof include butyl stearate, lauryl alcohol, stearyl alcohol, epoxy soybean oil, glycerin monostearate, stearic acid, and bisamide. These may be used alone or in combination of two or more.
The external lubricant is used for the purpose of increasing the sliding effect between the molten resin and the metal surface during molding. The external lubricant is not particularly limited, and examples thereof include paraffin wax, polyolefin wax, ester wax, and montanic acid wax. These may be used alone or in combination of two or more.

  The processing aid is not particularly limited, and examples thereof include acrylic processing aids such as alkyl acrylate-alkyl methacrylate copolymers having a weight average molecular weight of 100,000 to 2,000,000. The acrylic processing aid is not particularly limited, and examples thereof include n-butyl acrylate-methyl methacrylate copolymer and 2-ethylhexyl acrylate-methyl methacrylate-butyl methacrylate copolymer. These may be used alone or in combination of two or more.

  The impact modifier is not particularly limited, and examples thereof include methyl methacrylate-butadiene-styrene copolymer (MBS), chlorinated polyethylene, and acrylic rubber.

  The heat resistance improver is not particularly limited, and examples thereof include α-methylstyrene-based and N-phenylmaleimide-based resins.

  It does not specifically limit as said antioxidant, For example, a phenolic antioxidant etc. are mentioned.

  The light stabilizer is not particularly limited, and examples thereof include hindered amine light stabilizers.

  The ultraviolet absorber is not particularly limited, and examples thereof include salicylic acid ester-based, benzophenone-based, benzotriazole-based, and cyanoacrylate-based ultraviolet absorbers.

  The pigment is not particularly limited, and examples thereof include organic pigments such as azo, phthalocyanine, selenium, and dye lakes; oxides, molybdenum chromates, sulfides / selenides, ferrocyanides, and the like. Examples include inorganic pigments.

  In addition, a plasticizer may be added to the polyvinyl chloride resin composition, but since it may reduce the heat resistance and fire resistance of the molded product, it is not preferable to use a large amount. The plasticizer is not particularly limited, and examples thereof include dibutyl phthalate, di-2-ethylhexyl phthalate, and di-2-ethylhexyl adipate.

  The thermoplastic elastomer is not particularly limited. For example, acrylonitrile-butadiene copolymer (NBR), ethylene-vinyl acetate copolymer (EVA), ethylene-vinyl acetate-carbon monoxide copolymer (EVACO), Vinyl chloride-based thermoplastic elastomers such as vinyl chloride-vinyl acetate copolymer and vinyl chloride-vinylidene chloride copolymer, styrene-based thermoplastic elastomer, olefin-based thermoplastic elastomer, urethane-based thermoplastic elastomer, polyester-based thermoplastic elastomer, Examples thereof include polyamide-based thermoplastic elastomers. These thermoplastic elastomers may be used alone or in combination of two or more.

The material of the joint constituent member other than the above-mentioned fire-resistant and heat-expandable resin pipe is not particularly limited, but a synthetic resin composition containing a combustion retarding substance is preferable, and non-expanding as a combustion retarding substance with respect to 100 parts by weight of polyvinyl chloride resin. It is more preferable to use a resin composition containing 0.1 to 1 part by weight of graphite.
That is, if the non-expandable graphite is less than 0.1 part by weight, it is likely to be deformed by heat and the sealing surface with the mortar cannot be maintained and smoke may be generated. If it exceeds the part, there is a risk that the flat strength which is the JIS physical property of the joint cannot be secured.

The particle size of the non-expandable graphite is not particularly limited, but the average particle size is preferably 300 μm or less. That is, when the thickness is 300 μm or more, the flat strength may be insufficient.

The non-thermally expandable graphite is not particularly limited, but is preferably heat-dried before mixing with the polyvinyl chloride resin.
That is, volatile matter is attached to commercially available graphite, and this volatile matter may volatilize due to temperature rise during molding, which may cause a problem that the appearance of the molded product deteriorates, and the appearance of the molded product is improved. In order to keep it, it is preferable to remove volatile matter in advance by a heat drying treatment.

  Further, in the resin composition constituting the joint component other than the above-mentioned fire-resistant and heat-expandable resin pipe, the same stabilizer as the fire-resistant and heat-expandable resin pipe, if necessary, within a range not hindering the object of the present invention, Additives such as inorganic fillers, flame retardants, lubricants, processing aids, impact modifiers, heat improvers, antioxidants, light stabilizers, UV absorbers, pigments, plasticizers, thermoplastic elastomers, etc. are added May be.

Furthermore, when the drain pipe joint of the present invention uses an injection-molded joint component connected to the upper end of the fire-resistant and heat-expandable resin pipe, the gate position at the time of injection is the fire-resistant and heat-expandable resin pipe. It is preferable to use what is the connection part.
Moreover, the drainage pipe joint of the present invention may have swirl vanes inside for the purpose of improving drainage performance.
Furthermore, the main body trunk portion whose inner diameter is larger than the vertical pipe connected to the upper and lower sides, at least one side branch pipe connection portion provided so as to protrude from the wall surface of the main body trunk portion, and below the main body trunk portion In a drainage pipe joint provided with a tapered tube portion that is gradually reduced in diameter toward the lower end side, a first swirl vane provided inside the main body trunk portion and a lower side than the lower end of the first swirl vane A second swirl vane provided, and a third swirl vane provided below the lower end of the second swirl vane and in the tapered cylindrical portion, wherein the first to third swirl vanes are first It is preferable that the drainage received by the swirl vane is arranged so as to be swirled by the second swirl vane and not received by the third swirl vane.

  Further, although not particularly limited, the first to third swirl vanes are perpendicular L2 from the midpoint C1 of the line segment L1 connecting the outer edge upper end and the outer edge lower end of the first swirl vane to the central axis of the main body body, A perpendicular line L4 from the midpoint C2 of the line segment L3 connecting the outer edge upper end and the outer edge lower end of the second swirl vane to the center axis of the main body body, and a line segment L5 connecting the outer edge upper end and the outer edge lower end of the third swirl vane A perpendicular line L6 from the middle point C3 to the central axis of the main body body portion is projected when the perpendicular line L2, the perpendicular line L4, and the perpendicular line L6 are projected in the direction of the central axis from the first swirl blade side toward the third swirl blade side. It is preferable that an angle formed between the perpendicular line L2 and the perpendicular line L4 satisfies 70 to 90 °, and an angle formed between the projected perpendicular line L4 and the perpendicular line L6 satisfies 150 to 200 °.

That is, if the angle formed by the projected perpendicular L2 and perpendicular L4 is less than 70 °, the overlap between the first swirl vane and the second swirl vane becomes large, and the effect of each swirl vane is not sufficiently exhibited, and 90 ° If it exceeds, there is a possibility that the drainage from the first swirl vane cannot be sufficiently received by the second swirl vane.
Also, if the angle formed between the perpendicular line L4 and the perpendicular line L6 is less than 150 °, the swirl flow from the second swirl vane and the swirl flow of the third swirl vane interfere with each other, the flow is disturbed, and the ventilation core is blocked. If the angle exceeds 200 °, the overlap between the first swirl vane and the third swirl vane increases, and the effects of the respective swirl vanes may not be sufficiently exhibited.
The outer edge of the swirl vane means an edge along the inner wall surface of the joint body that supports the swirl vane or the wall surface of the support leg. Depending on the shape of the swirl vane, the outer edge upper end is the highest point of the swirl vane, and the outer edge lower end May not be the lowest point of the swirl vane.

In the present invention, the swirl vane is formed by bonding or integrally molding to a cylindrical part such as a main body body part, or by forming a wall surface of a cylindrical member constituting the joint body, or having a circular arc cross section. It is provided by incorporating in the joint body a member obtained by bonding or integrally forming the swirl blades along the arc inner wall surface of the blade support leg.
Therefore, the outer edge of the swirling blade refers to an edge in contact with the inner wall surface of the cylindrical portion, an edge in contact with the inner peripheral surface of the cylindrical member, or an edge in contact with the arc inner wall surface of the blade support leg portion. The lower end may not necessarily be the upper end or the lower end of the swirl vane itself.

Although not particularly limited, it is preferable that the height difference between the lower end of the first swirl vane and the upper end of the second swirl vane is not less than 0 and not more than twice the inner diameter of the main body barrel.
That is, if the height difference deviates from the above range, the drainage does not transfer well from the first swirl vane to the second swirl vane, which may disturb the swirl flow.

Although not particularly limited, the first to third swirl blades are preferably inclined at an inclination angle of 15 to 50 ° (preferably 20 to 45 °) with respect to the tube axis. That is, if the angle of inclination of each swirl blade is too steep, the drainage that flows down cannot be received sufficiently, and if it is too loose, the rebound of the drainage that flows down increases and the flow may be disturbed.
Although the inclination angle of the first to third swirl blades with respect to the tube axis may be the same, the inclination angle of the second swirl blade is made smaller than the inclination angle of the first swirl blade and the tilt angle of the third swirl blade. Is preferred.

The size of the first to third swirl vanes is not particularly limited, but the projected area ratio to the horizontal inner cross section of the vertical pipe is 5 to 30% in the first swirl vane and the second swirl vane, and the third swirl vane. Is provided on the tapered surface, it is preferable to have a size of 3 to 25%.
That is, if the projected area ratio is too small, the effect of the swirl blade cannot be sufficiently obtained, and if the projected area ratio is too large, it may hinder the passage of solids and test balls flowing down the vertical pipe. There is.

Although the drainage pipe joint of the present invention is not particularly limited, the lateral branch pipe connecting portion includes a longitudinal rib on the inner wall surface of the main body, which prevents the entrance of drainage from upstream into the main body trunk side opening of the lateral branch pipe junction. It is preferable.
The vertical rib may be provided on the downstream side of the first swirl vane so that the waste water hitting the vertical rib is received by the second swirl vane.

  The height of the vertical rib (maximum protrusion amount in the tube center direction) is not particularly limited as long as it can prevent the entrance of drainage from upstream to the body trunk side opening of the side branch pipe confluence, but it is too high. Then, since it becomes obstructive for the passage of solids and test balls flowing down the vertical pipe, if the inner diameter of the main body is about 140 mm, the maximum height from the inner wall of the main body is 5 to 30 mm. The degree is preferred.

The material of the drainage pipe joint of the present invention is not particularly limited, but considering the weight reduction and ease of manufacture, a plurality of tubular or ring-shaped joint constituent members made of a synthetic resin composition are connected and integrated. It is preferable that the joint component forming at least the floor slab penetrating portion is formed of a fire-resistant and heat-expandable resin pipe including at least a fire-resistant and expandable layer made of a fire-resistant and thermally expandable resin composition. .
That is, since it is all made of synthetic resin, it is lightweight.

  In addition, the floor slab penetration part is required to have fire resistance so that smoke and flame from the downstairs will not enter the upper floor from the floor slab penetration part for more than 2 hours even if a fire breaks down. If the joint component constituting the part is formed of a fire-resistant and heat-expandable resin pipe having at least a fire-resistant and expandable resin layer made of a fire-resistant and thermally expandable resin composition, the downstairs exposed part of the drainage pipe joint is exposed to the downstairs flame. Even if it disappears, the fire-resistant expansion layer of the fire-resistant and heat-expandable resin pipe expands and the floor slab penetrating portion is blocked, and the downstairs flame and smoke do not pass through the drainage pipe joint and enter the upper floor.

  The drainage pipe joint according to the present invention is lightweight because it is entirely formed of resin as described above. Moreover, since the sound insulation resin sheet is wound at least around the floor slab penetrating portion, the sound insulation property is excellent. Moreover, since the sound insulation resin sheet is wound around the joint body so that the direction of heat shrinkage is parallel to the central axis of the floor slab penetrating part, even if the sound insulation resin sheet tries to heat shrink due to a fire, The force in the direction of diameter reduction does not work on the floor slab penetration of the joint body. Therefore, there is no gap between the floor slab and mortar, and long-term fire resistance can be ensured.

It is a longitudinal section showing a 1st embodiment of a drainage pipe joint concerning the present invention. It is the figure which looked at the cross section of the main body trunk | drum of the drain pipe joint of FIG. 1 from upper direction. It is sectional drawing of the part of the taper cylinder part which looked at the drain pipe joint of FIG. 1 from the reverse direction. It is the schematic of the manufacturing method of the sound insulation resin sheet used as the sound insulation cover of the drain pipe joint of FIG. It is sectional drawing explaining the construction state of the drain pipe joint of FIG. It is a front view of the decomposition | disassembly state of the drain pipe joint of FIG. It is a figure explaining the fireproof test method of the drainage collective joint of an Example and a comparative example.

Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof.
1 to 3 show a first embodiment of a drainage pipe joint according to the present invention, and FIG. 4 shows a construction state thereof.

As shown in FIG. 1, the drain pipe joint A includes a joint body B and a sound insulation cover C.
As will be described in detail later, the joint body B includes eleven joint constituent members of the first joint constituent member 10 to the eleventh joint constituent member 20 shown in FIG. 6, and three of the first packing 31 to the third packing 33. It is formed by assembling the packing.

And the 1st joint structural member 10 used as a floor slab penetration part is formed with the fire resistant thermal expansion resin pipe explained in full detail below, and the other joint structural members 11-20 are the vinyl chloride resin provided with the flame retardance. Is formed.
As shown in FIG. 1, the sound insulation cover C includes a joint portion between the first joint constituent member 10 to be a floor slab penetrating portion and the second joint constituent member 11 connected on the first joint constituent member 10. It is provided to cover.

The sound insulation cover C is formed as follows.
That is, as shown in FIG. 4, it is obtained by extruding a soft vinyl chloride resin sheet to be a surface layer and simultaneously adding and integrating a polyester nonwoven fabric sheet to be a back layer to the soft vinyl chloride resin sheet. The original sound insulation resin sheet 61 is cut into a strip shape so that the direction perpendicular to the rolling direction (arrow Z direction) at the time of calendering the soft vinyl chloride resin sheet is the longitudinal direction, and the tape-like sound insulation resin sheet 62 is obtained. obtain.
Next, the sound insulation resin sheet 62 is longitudinally connected to the joint portion between the first joint constituent member 10 of the assembled joint body B and the second joint constituent member 11 connected on the first joint constituent member 10. Is wound so that the extrusion direction of the original fabric 61 is parallel to the central axis of the first joint component 10.
Further, the sound insulation resin sheet 62 is wound so as to straddle both the constituent members 10 and 11 at the portion corresponding to the joint portion between the first joint constituent member 10 and the second joint constituent member 11.

Next, the joint body B will be described in detail.
That is, the joint main body B includes the main body trunk portion 11a, the three lateral branch pipe connection portions 21, and the tapered tube portion 13b, and the first swirling blade 14g, the second swirling blade 12c, and the third swirling blade 52. A total of three swirl vanes are provided.
The main body trunk portion 11a has a larger inner diameter than the vertical pipe connected to the upper and lower sides (for example, when the vertical pipe is 100A, the inner diameter is 135 to 145 mm).

The three lateral branch pipe connection portions 21 are substantially orthogonal to the tube axis of the main body trunk portion 11a, and are shifted by 90 ° in the circumferential direction of the main body trunk portion 11a with the one lateral branch pipe connection portion 21 at the center. It is connected to the main body trunk portion 11a.
Three vertical ribs 51a, 51b, 51c are integrally provided on the inner wall surface of the main body body 11a.

The vertical ribs 51 a, 51 b, 51 c respectively enter the horizontal branch pipe connection part 21 from the opening end of each horizontal branch pipe connection part 21 on the side of the main body part 11 a of the horizontal branch pipe connection part 21. For the purpose of preventing the horizontal branch pipe connection portion 21 from being blocked, the horizontal branch pipe connection portion 21 is provided on the upstream side of the swirling flow of the drainage near the open end of each horizontal branch pipe connection portion.
The height of the vertical ribs 51a, 51b, 51c (the dimension in the direction of the central axis of the main body body 11a from the inner wall surface of the main body body 11a) does not hinder the passage of the test ball and achieves the above object. If it can, it will not specifically limit, However, The vertical rib 51a provided in the immediate vicinity of the 1st swirl | wing blade 14g in the downstream of the 1st swirl | wing blade 14g mentioned later is a little higher than others.

As shown in FIG. 1, the first swirl vane 14g is disposed on the upstream side of the swirl flow with respect to the vertical rib 51a in the main body 11a, and is included in the arc of the swirl vane support leg 14h having a horizontal cross-section arc shape. It is provided along the peripheral surface.
The first swirl vane 14g has an inclination angle of 15 to 50 degrees with respect to the tube axis, and a projection area ratio with respect to the inner cross-sectional area of the connected standpipe is 5 to 30%. Yes.

The second swirl vane 12c does not overlap the first swirl vane 14g in the horizontal direction, and the height difference between the upper end of the second swirl vane 14g and the lower end of the first swirl vane 14g is equal to or less than the inner diameter of the main body trunk 11a and the inclination thereof. The angle is slightly smaller than the first swirl vane 14g and the third swirl vane 52 described later with respect to the tube axis, and the size thereof is formed such that the projected area ratio with respect to the inner cross-sectional area of the vertical tube is 5 to 30%. ing.
The second swirl vane 12c includes a perpendicular line L2 from the midpoint C1 of the line segment L1 connecting the upper edge of the first swirl vane 14 and the lower edge of the outer edge to the central axis C of the main body trunk 11a, and the second swirl vane 12c. The perpendicular L2 projected when the normal line L4 from the midpoint C2 of the line segment L3 connecting the upper edge of the outer edge and the lower edge of the outer edge to the central axis C of the main body body 11a is projected in the direction of the central axis of the main body 11a. And the vertical line L4 are arranged so as to satisfy the vertical rib 51a from below.

Further, the height difference between the upper end of the second swirl vane 12c and the lower end of the first swirl vane 14g is greater than 0 and equal to or less than twice the inner diameter of the main body body 11a.
The third swirl vane 52 is provided in the tapered cylinder portion 13b, and the size thereof is formed such that the projected area ratio with respect to the inner cross-sectional area of the vertical pipe is 5 to 30%.
Further, the third swirl vane 52 has a perpendicular line L6 from the midpoint C3 of the line segment L5 connecting the outer edge upper end and the outer edge lower end of the third swirl blade 52 to the central axis of the main body body, and the perpendicular line L4. The angle β formed between the perpendicular L6 and the perpendicular L4 projected when projected in the direction of the central axis of the main body trunk portion 11a satisfies 150 to 200 °, and the wastewater that is swirled by the second swirl vane 12c The three swirl blades 52 are provided at positions that do not flow.

In this drain pipe joint A, the joint body B is composed of 11 joint constituent members of the first joint constituent member 10 to the eleventh joint constituent member 20 shown in FIG. 6, and 3 of the first packing 31 to the third packing 33. It is formed by assembling two packings.
More specifically, the first joint component 10 has a ratio of 1 to 15 parts by weight of thermally expandable graphite with respect to 100 parts by weight of the polyvinyl chloride resin disclosed in, for example, Japanese Patent Application Laid-Open No. 2008-180367. A fire-resistant expansion layer formed of a fire-resistant and heat-expandable resin composition, and a coating layer formed of a polyvinyl chloride resin composition not containing a heat-expandable fire-resistant material covering the inner and outer surfaces of the fire-resistant expansion layer. It is a fire-resistant and heat-expandable resin pipe (for example, Sekisui Chemical Co., Ltd. Eslon fire-resistant VP pipe) obtained by extrusion molding having a three-layer structure, and has a larger diameter than a drainage standpipe P1 described later.

The second joint constituent member 11 to the eleventh joint constituent member 20 are each made of polyvinyl chloride containing 0.1 to 1.0 parts by weight of non-expandable graphite with respect to 100 parts by weight of the polyvinyl chloride resin. It is obtained by injection molding a resin composition.
As shown in FIGS. 1 to 3, the second joint component member 11 includes a main body body portion 11 a as a longitudinal pipe forming portion and three lateral portions constituting a part of the lateral branch pipe connecting portion 21. A branch pipe connecting portion forming cylinder portion 11b.

The main body trunk portion 11a has a cylindrical shape having an inner diameter substantially the same as the outer diameter of the first joint component member 10, and an upper fitting portion 11c on which the lower end portion of the third joint component member 12 is fitted, The lower fitting part 11d which the ring-shaped fitting part 12a of the 4th joint structural member 13 mentioned later and the upper end part of the 1st joint structural member 10 fit is provided in the side.
In addition, the above-described three vertical ribs 51a, 51b, 51c are provided on the inner surface of the main body trunk portion 11a so as to reach the upper end of the lower fitting portion 12d from the lower end of the upper fitting portion 11c.

Each horizontal branch pipe connecting portion forming cylinder portion 11b is provided so as to protrude in a cylindrical shape from the outer wall surface of the main body trunk portion 11a at the same height position of the main body trunk portion 11a.
Further, the second joint component member 11 is provided with a gate position at the time of injection molding at the lower end thereof, that is, at the connection portion with the first joint component member 10.

The third joint component 12 includes a ring-shaped fitting part 12a and a swirl blade forming part 12b.
The ring-shaped fitting portion 12 a has an outer diameter that is substantially the same as the inner diameter of the main body trunk portion 11 a of the second joint component 11, and has a ring shape that is substantially the same as the height of the vertical rib 51.

The swirl blade forming portion 12b includes a second swirl blade 12c and a blade support leg 12d.
The blade support leg portion 12d extends from the lower end of the ring-shaped fitting portion 12a, and the vertical dimension is substantially the same as the vertical dimension (tube axis direction) of the first joint component member 10. The horizontal cross section has an arc shape.
As shown in FIG. 3, the third joint component member 12 is provided at a position where the second swirl vane 12 c faces the vertical rib 51 a from below.

The fourth joint component 13 includes an upper receiving port 13a, a tapered tube portion 13b, and a lower receiving port 13c.
The upper receiving port 13 a is configured such that the lower end of the first joint component member 10 is fitted therein, and the inner diameter thereof is substantially the same as the outer diameter of the first joint component member 10.

The tapered cylindrical portion 13b is gradually reduced in diameter from the upper end toward the lower end, and the upper end is substantially the same inner diameter as the inner diameter of the first joint component member 10, and the inner diameter of the drainage pipe P1 to which the lower end is connected is It is almost the same.
Further, as shown in FIGS. 1 and 6, the tapered cylindrical portion 13 b is provided with third swirl vanes 52 so as to protrude inward by denting a part of the wall surface inward.

The fifth joint component member 14 includes a main body portion 14a and a swirl blade forming portion 14b.
The main body part 14a includes an upper cylinder part 14c and a lower cylinder part 14d.
The upper cylindrical portion 14c has an outer diameter larger than the inner diameter of the main body trunk portion 11a of the second joint component member 11, and a sixth joint component member 15 (described later) is fitted on the outer peripheral surface of the upper end portion thereof in a retaining state. A mating protrusion 14e to be mated is provided in a ring shape.

The lower cylindrical portion 14d has a stepped diameter from the lower end of the upper cylindrical portion 14c, and the outer diameter thereof is substantially the same as the inner diameter of the main body barrel portion 11a of the second joint component member 11.
The lower cylindrical portion 14d has a ring-like rib 14f that projects inwardly at the lower end thereof and receives the load of the drainage standpipe P1 via a standpipe receiving portion 31b of the first packing 31 described later. .

The inner diameter of the rib 14f is substantially the same as the inner diameter of the drainage pipe P1.
The swirl blade forming portion 14b includes a first swirl blade 14g and a blade support leg portion 14h.
The swirl vane support leg 14h has a width substantially the same as the horizontal width of the first swirl vane 14g and extends downward from the lower end of the lower cylindrical portion 14d, and supports the first swirl vane 14g slightly above the lower edge.

The first packing 31 is a packing made of a rubber material such as ethylene-propylene-diene rubber (EPDM) that is normally used in drainage equipment. The first packing 31 has a nominal diameter of 100A, for example, as shown in FIG. There is a lip portion 31a that tightly adheres to the outer peripheral surface of the drainage standpipe P1, and the upper end surface of the main body portion 14a of the fifth joint component member 14 is substantially aligned with the upper end surface of the fifth joint component member 14. It is mated.
Further, the lip portion 31a is provided so as to gradually become smaller in diameter toward the lower end side, the upper end side is substantially the same as or slightly larger in diameter than the drainage standpipe P1, and the lower end side of the drainage standpipe P1. It has a vertical tube receiving portion 31b that is smaller than the outer diameter and stepped. And this vertical pipe receiving part 31b receives the pipe end part of the drainage vertical pipe P1, and absorbs the thermal expansion-contraction of the drainage vertical pipe P1.

The sixth joint constituent member 15 is fitted on the upper end portion of the fifth joint constituent member 14, and the flange portion 15a provided at one end prevents the first packing 31 from being detached from the fifth joint constituent member 14. It has become.
Then, after the fifth joint component member 14, the first packing 31 and the sixth joint component member 15 are assembled and integrated in advance, the lower tubular portion 14 d of the fifth joint component member 14 is connected to the second joint component member 11. It is fitted and bonded to the upper fitting part 11c provided in the main body trunk part 11a.

The seventh joint component 16 has a fitting portion 16a at one end and a packing mounting portion 16b at the other end.
The fitting portion 16 a is fitted and bonded to the side branch pipe connecting portion forming cylinder portion 11 b of the second joint component member 11.
The packing mounting portion 16b has a slightly larger outer diameter than the fitting portion 16a, and a second packing 32 described later is fitted thereto.

  The second packing 32 is a packing made of a rubber material such as ethylene-propylene-diene rubber (EPDM) that is normally used in drainage equipment, and is fitted to the packing mounting portion 16b. For example, as shown in FIG. The lip portion 32a is provided in close contact with the outer peripheral surface of the horizontal branch pipe P2 having a nominal diameter of 80A.

  The eighth joint component 17 is externally fitted to the packing mounting portion 16b of the seventh joint component 16, and the flange portion 17a provided at one end prevents the second packing 32 from being detached from the seventh joint component 16. It is supposed to be.

The ninth joint component 18 has a fitting portion 18a at one end and a packing mounting portion 18b at the other end.
The fitting portion 18 a is fitted and bonded to the horizontal branch pipe connecting portion forming cylinder portion 11 b of the second joint component member 11.
The packing mounting portion 18b has a slightly larger outer diameter than the fitting portion 18a, and a second packing 32 described later is fitted thereto.
Further, a hole 18c into which a later-described side branch pipe P3 penetrating the fitting part 18a and the packing mounting part 18b is inserted is a ninth joint to the side branch pipe connecting part forming cylinder part 11b of the ninth joint constituent member 1. The component member 18 is decentered downward from the central axis.

  The third packing 33 is a packing made of a rubber material such as ethylene-propylene-diene rubber (EPDM), which is usually used in drainage equipment, and is fitted to the taper packing mounting portion 18b. For example, as shown in FIG. It has a lip portion 33a that is in close water-tight contact with the outer peripheral surface of the side branch pipe P3 having a diameter of 50A.

  The tenth joint component member 19 is externally fitted to the packing mounting portion 18b of the ninth joint component member 18, and the flange portion 19a provided at one end prevents the third packing 33 from being detached from the ninth joint component member 18. It is supposed to be.

  As shown in FIG. 2, the eleventh joint component member 20 includes a lid 20a and a fitting portion 20b, and the fitting portion 20b does not connect the side branch pipe P2 of the second joint component member 11. The side branch tube connecting portion forming cylinder portion 11b is sealed by fitting and bonding to the portion forming cylinder portion 11b.

And as shown in FIG. 4, this drainage pipe coupling A is used for the side branch pipe confluence | merging part of each floor of the drainage standing line of a multi-story building, and is constructed as follows.
That is, the first joint constituent member 10 and the first joint constituent member 10 and the portion including the fitting connection portion of the second joint constituent member 11 are installed in a state facing the through hole S1 of the floor slab S, and the lower side The floor drainage pipe P1 (for example, an ESLON fireproof VP pipe manufactured by Sekisui Chemical Co., Ltd., which is a commercial product) can be fitted into the lower receiving port 13c of the fourth joint component 13 and bonded.
Further, the lower end portion of the drainage pipe P <b> 1 on the upper floor is fitted to the fifth joint constituent member 15 through the sixth joint constituent member 5.

Next, the floor slab through-hole S1 is filled with mortar M, and a portion including the first joint constituent member 10 and the fitting joint portion of the first joint constituent member 10 and the second joint constituent member 11 is embedded in the mortar M. .
Then, the end portion of the side branch pipe P2 is inserted into the seventh joint constituent member 17 via the ninth joint constituent member 19 and the eighth joint constituent member 18 to connect the side branch pipe P2.

Since the drainage pipe joint A is entirely made of resin as described above, it is lighter than a cast iron or fireproof double-layer pipe.
Moreover, since the floor slab penetration part of the joint main body B is covered with the sound insulation cover C, it is less likely that the drainage sound flowing inside the drainage pipe joint A propagates through the floor slab S and is transmitted into the building. This can reduce drainage noise transmitted to the room.

And since the 1st joint structural member 10 which comprises a floor slab penetration part is formed with the fire-resistant thermally expansible resin pipe, the floor slab penetration part of the joint main body B by the thermal expansion of a fire-resistant thermally expansible pipe at the time of a fire Since the sound insulation cover C is formed by winding the sound insulation resin sheet 62 in a state in which the extrusion direction of the original fabric 61 is arranged parallel to the tube axis of the first joint component member 10, Even if the sound insulation resin sheet 62 is thermally contracted by this heat, the joint portion between the first joint component member 10 and the second joint component member 11 is not contracted in the direction of reducing the diameter. Therefore, a gap does not occur between the peripheral surface of the floor slab penetrating portion of the drainage pipe joint A and the mortar M of the floor slab S due to the thermal contraction of the sound insulating resin sheet 62. That is, it is possible to prevent burning or smoke from flowing into the floors above and below the fire occurrence floor for a long time.

In addition, since the drainage pipe joint A includes the three swirl blades 14g, 12c, and 52 in the joint body B as described above, the drainage performance is high.
That is, out of the drainage flowing down from the upper floor to the drainage pipe joint A, the drainage received by the first swirl vane 14g is first decelerated by the first swirl vane 14g and given a swirl force. And the waste water which passed through the 1st swirl | wing blade 14g is not received by the 1st swirl | wing blade 14g, but is received by the 2nd swirl | wing blade 12c with the waste_water | drain received directly by the 2nd swirl | wing blade 12c, and a turning force is further provided. While flowing down. And the waste water which passed through the 2nd swirl | wing blade 12c is received by the 3rd swirl | wing blade 52, and flows into the drainage vertical pipe P1 of a lower floor, maintaining a swirl flow.

On the other hand, the wastewater that is not received by the first swirl vane 14g and the second swirl vane 12c but directly received by the third swirl vane 52 is decelerated by the third swirl vane 52, is given a swirl force, and maintains swirl flow. However, it flows into the drainage pipe P1 on the lower floor.
In other words, the drainage pipe joint A is located below the drainage swirled by the first swirl vane 14g and the second swirl vane 12c and the wastewater swirled by the third swirl vane without joining. Flow down. Therefore, a sufficient ventilation core can be secured and drainage performance is improved.

  Furthermore, since the waste water that has been swirled by the first swirl blade 14g and the second swirl blade 12c and the waste water that has been swirled by the third swirl blade 52 do not merge, the generation of drainage noise is also reduced. It becomes possible to do.

Moreover, the 2nd joint structural member 11 is equipped with the vertical rib 51a, 51b, 51c which obstructs the entrance of waste_water | drain from upstream to the main body trunk | drum 11a side opening of the side branch pipe connection part 21 in the main body trunk | drum 11a inner wall surface. Therefore, the drainage flowing down as a swirling flow from above does not flow into the side branch pipe connecting portion 21 side and block the side branch pipe side.
Further, the drainage flowing down from the upper vertical pipe enters the drainage pipe joint A, and the drainage received by the first swirl vane 14g is strengthened by the first swirl vane 14g and goes downstream. However, since the height of the vertical rib 51a provided immediately downstream of the first swirl vane 14g is higher than that of the other vertical ribs 51b and 51c, the vertical rib 51a is not overcome.
Then, the waste water hitting the vertical rib 51a is reliably received by the second swirl vane 12c provided immediately below the vertical rib 51a, and the swirl force is strengthened by the second swirl vane 12c toward the downstream side.

The drainage pipe joint of the present invention is not limited to the above embodiment. For example, in the above embodiment, the sound insulating resin sheet is partially wound only on the floor slab penetrating portion of the joint body, but may be wound around the entire joint body.
In the above-described embodiment, the second joint component member includes the lateral branch pipe connection portion forming cylinder portion in three directions. However, the second joint component member may be provided in two directions or may be provided only in one direction.
In the above embodiment, three swirl vanes are provided in the vertical direction, but two or less may be used as long as the drainage capacity can be secured.
In said embodiment, although the sound insulation resin sheet was provided with the surface layer and the back surface layer, a single layer may be sufficient.

  Examples of the present invention and comparative examples will be described below.

Example 1
The joint main body shown in FIG. 1 provided in each part dimension was produced.
Inner diameter of main body 11a: 140 mm
Inner diameter of first joint component 10: 125 mm
Inclination angle of the first swirl vane 14g: 35 °
Projected area ratio of the first swirl blade 14g: 14%
Inclination angle of second swirl vane 12c: 29 °
Projected area ratio of second swirl vane 12c: 20%
Inclination angle of third swirl blade 52: 34 °
Projected area ratio of the third swirl blade 52: 21%
Height of vertical rib 51a: 20mm
Angle α: 90 °
Angle β: 157 °
Height difference between the lower end of the first swirl vane 14g and the upper end of the second swirl vane 12c: 41 mm
Next, it comprises a surface layer made of a soft vinyl chloride resin containing iron oxide powder and a back layer made of a polyester nonwoven fabric, and has a thickness of 1.1 ± 0.2 mm and a mass of 2.1 ± 0.2 kg / m ² . The original fabric was cut so that the direction perpendicular to the rolling direction at the time of calendar molding of the surface layer was the longitudinal direction to obtain a sound insulating resin sheet 62 shown in FIG.
Then, the sound insulation resin sheet 62 is wound around the joint body B so that the short side direction (the rolling direction of the surface layer) is parallel to the pipe axis of the first joint member 10 to obtain the drain pipe joint shown in FIG. It was.

(Example 2)
A drainage pipe joint was obtained in the same manner as in Example 1 except that the joint body shown in FIG.
Inner diameter of main body 11a: 140 mm
Inner diameter of first joint component 10: 125 mm
Inclination angle of the first swirl vane 14g: 35 °
Projected area ratio of the first swirl blade 14g: 14%
Inclination angle of second swirl vane 12c: 29 °
Projected area ratio of second swirl vane 12c: 20%
Inclination angle of third swirl blade 52: 34 °
Projected area ratio of the third swirl blade 52: 21%
Height of vertical rib 51a: 20mm
Angle α: 90 °
Angle β: 167 °
Height difference between the lower end of the first swirl vane 14g and the upper end of the second swirl vane 12c: 41 mm

(Example 3)
A drainage pipe joint was obtained in the same manner as in Example 1 except that the joint body shown in FIG.
Inner diameter of main body 11a: 140 mm
Inner diameter of first joint component 10: 125 mm
Inclination angle of the first swirl vane 14g: 35 °
Projected area ratio of the first swirl blade 14g: 14%
Inclination angle of second swirl vane 12c: 29 °
Projected area ratio of second swirl vane 12c: 20%
Inclination angle of third swirl blade 52: 34 °
Projected area ratio of the third swirl blade 52: 21%
Height of vertical rib 51a: 20mm
Angle α: 90 °
Angle β: 157 °
Height difference between the lower end of the first swirl vane 14g and the upper end of the second swirl vane 12c: 200 mm

(Example 4)
A drainage pipe joint was obtained in the same manner as in Example 1 except that the joint body shown in FIG.
Inner diameter of main body 11a: 140 mm
Inner diameter of first joint component 10: 125 mm
Inclination angle of the first swirl vane 14g: 35 °
Projected area ratio of the first swirl blade 14g: 14%
Inclination angle of second swirl vane 12c: 29 °
Projected area ratio of second swirl vane 12c: 20%
Inclination angle of third swirl blade 52: 34 °
Projected area ratio of the third swirl blade 52: 21%
Height of vertical rib 51a: 20mm
Angle α: 51 °
Angle β: 146 °
Height difference between the lower end of the first swirl vane 14g and the upper end of the second swirl vane 12c: 40 mm

(Example 5)
A drainage pipe joint was obtained in the same manner as in Example 1 except that the joint body shown in FIG.
Inner diameter of main body 11a: 140 mm
Inner diameter of first joint component 10: 125 mm
Inclination angle of the first swirl vane 14g: 35 °
Projected area ratio of the first swirl blade 14g: 14%
Inclination angle of second swirl vane 12c: 29 °
Projected area ratio of second swirl vane 12c: 20%
Inclination angle of third swirl blade 52: 34 °
Projected area ratio of the third swirl blade 52: 21%
Height of vertical rib 51a: 20mm
Angle α: 29 °
Angle β: 147 °
Height difference between the lower end of the first swirl vane 14g and the upper end of the second swirl vane 12c: 41 mm

(Example 6)
A drainage pipe joint was obtained in the same manner as in Example 1 except that the joint body shown in FIG.
Inner diameter of main body 11a: 140 mm
Inner diameter of first joint component 10: 125 mm
Inclination angle of the first swirl vane 14g: 35 °
Projected area ratio of the first swirl blade 14g: 14%
Inclination angle of second swirl vane 12c: 29 °
Projected area ratio of second swirl vane 12c: 20%
Inclination angle of third swirl blade 52: 34 °
Projected area ratio of the third swirl blade 52: 21%
Height of vertical rib 51a: 20mm
Angle α: 29 °
Angle β: 167 °
Height difference between the lower end of the first swirl vane 14g and the upper end of the second swirl vane 12c: 41 mm

(Example 7)
A drainage pipe joint was obtained in the same manner as in Example 1 except that the joint body shown in FIG.
Inner diameter of main body 11a: 140 mm
Inner diameter of first joint component 10: 125 mm
Inclination angle of the first swirl vane 14g: 35 °
Projected area ratio of the first swirl blade 14g: 14%
Inclination angle of second swirl vane 12c: 29 °
Projected area ratio of second swirl vane 12c: 20%
Inclination angle of third swirl blade 52: 34 °
Projected area ratio of the third swirl blade 52: 21%
Height of vertical rib 51a: 20mm
Angle α: 284 °
Angle β: 223 °
Height difference between the lower end of the first swirl vane 14g and the upper end of the second swirl vane 12c: 41 mm

(Comparative Example 1)
The sound-insulating resin sheet 63 shown in FIG. 4 was obtained by cutting the same raw material as in Example 1 so that the rolling direction at the time of calendar molding of the surface layer was the longitudinal direction, and having a tape shape.
Then, the sound insulation resin sheet 63 is drained in the same manner as in Example 1 except that the sound insulation resin sheet 63 is wound around the joint body B so that the longitudinal direction (the rolling direction of the surface layer) is parallel to the tube axis of the first joint member 10. A pipe joint was obtained.

(Comparative Example 2)
A drainage pipe joint having only a joint body similar to that in Example 1 was prepared without providing a sound insulation cover.

  The drainage pipe joints obtained in Example 1 and Comparative Examples 1 and 2 were examined for fire resistance and sound insulation performance as follows, and the results are shown in Table 1.

(Fire resistance test)
A fire resistance test (according to ISO 834-1, an evaluation method for the fire resistance performance test of the revised Building Standard Law, which was enacted on June 1, 2000) was conducted by the fire resistance test furnace F shown in FIG.
As the floor slab S, a PC (precast concrete) panel having a thickness of 100 mm was used. In FIG. 7, B is a burner, and TC is a thermocouple for temperature measurement.
L ₁ = 100 mm, d ₁ = 140 mm, d ₂ = 150 mm
[Sound insulation performance test]
The drainage pipe joint obtained in Example 1 and Comparative Examples 1 and 2 in which the side branch pipe connection part is sealed with a vinyl chloride resin cap, and a sample standing pipe for the first floor in which a vinyl chloride resin pipe is connected to the drain pipe joint Each channel is formed and stored in the sound insulation box with the upper and lower ends of the sample standway exposed to the outside of the sound insulation box, and drained at 3.0 L / s from the upper open end outside the sound insulation box of the sample standway The sound of drainage generated from the sample vertical line when flowing through was measured with a sound level meter installed in the sound insulation box.

  From Table 1 above, it can be seen that the drainage pipe joint of the present invention is excellent in fire resistance and sound insulation as well as the drainage pipe joint described in the publicly known document 1 previously proposed by the applicant.

An experimental drainage conduit equivalent to the 17th floor of the condominium using the drainage pipe joints prepared in Examples 1 to 7 on each floor was formed, respectively, and the 17th floor of this experimental drainage pipeline was formed. The drainage was made to flow gradually while increasing the drainage amount from the corresponding part, and the maximum drainage amount in which the maximum generated negative pressure in the pipes in all drainage pipe joints did not exceed 400 Pa was examined.
Further, it is determined whether or not the drainage received by the first swirl vane 14g is received by the second swirl vane 12c and whether or not the drainage received by the second swirl vane 12c is received by the third swirl vane 52. It was.

Table 2 also shows the maximum drainage amount and whether or not the second swirl vane 12c can receive the drainage received by the second swirl vane 12c. .
In Table 2, “Noru” is indicated when drainage is received, and “No” is indicated when no drainage is received.

  From Table 2 above, it can be seen that the drainage performance is improved if the swirl vanes are arranged as in Examples 1 and 2.

A Drainage pipe joint B Joint body C Sound insulation cover 61 Original fabric (sound insulation resin sheet)
62 Sound insulation resin sheet 10 First joint component (fireproof and thermally expandable pipe)
11 Second joint constituent member 11a Main body trunk part 11b Side branch pipe connecting part forming cylinder part 12 Third joint constituent member 12c Second swirl vane 13 Fourth joint constituent member 13b Taper cylindrical part 14 Fifth joint constituent member 14g First Swirling blade 15 Sixth joint constituent member 16 Seventh joint constituent member 17 Eighth joint constituent member 18 Ninth joint constituent member 19 Tenth joint constituent member 20 Eleventh joint constituent member 21 Side branch pipe connecting portion 31 First packing 32 First 2 packing 33 3rd packing 51a, 51b, 51c Vertical rib 52 3rd swirl | wing blade P1 Drainage pipe P2, P3 Side branch pipe

Claims (3)

A fireproof expansion formed by assembling a plurality of joint constituent members, and a joint constituent member constituting at least a part of a floor slab penetrating portion of the plurality of joint constituent members having a tubular shape made of a fireproof and thermally expandable resin composition A drainage pipe joint used for a floor slab penetrating portion formed of a fireproof and thermally expandable resin pipe having at least a layer,
Around the joint of the fire-resistant and heat-expandable resin pipe constituting the floor slab penetrating portion, or the joint portion of the fire-resistant and heat-expandable resin pipe and other joint components that form the floor slab penetrating portion together with the fire-resistant and thermally expandable resin pipe With a sound insulation cover to surround
The sound insulation cover is formed by winding the sound insulation resin sheet around the joint body so that the heat shrink direction of the sound insulation resin sheet is parallel to the central axis of the floor slab penetrating portion. And drainage pipe fittings.   The drain pipe joint according to claim 1, wherein the sound insulation resin sheet is wound so as to straddle the fire-resistant and heat-expandable resin pipe and the other joint constituent members joined to the fire-resistant and heat-expandable resin pipe. The drainage pipe joint according to claim 1 or 2, wherein the sound insulating resin sheet is a laminate including a surface layer made of a soft vinyl chloride resin sheet and a back layer made of a synthetic resin nonwoven fabric.

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