JP4829847B2 - In-building piping - Google Patents

Description

  The present invention relates to a piping line in a building.

In the case of a multi-layered building such as an apartment house, each floor is partitioned by floor slabs, and each room is partitioned by walls on each floor. And piping, such as drainage and water supply piping, is penetrated through a floor slab and a wall.
And, for example, in the slab penetration part of the drainage conduit, which is a partition penetration part, as shown in FIG. In order to prevent the flow of flames and smoke from the fire floor to the upper floor or the lower floor, it is provided in the slab penetration part 310 and the slab 200 of the drainage pipe joint 300 constituting a part of the drainage pipe 100. The mortar 400 is filled in the gap with the through hole 210. In FIG. 4, 500 is a lateral branch pipe, and 320 is a lateral branch pipe connecting portion.

By the way, as a piping material used for such a slab penetrating part, fire resistance is required for itself, so that the periphery of the inner pipe made of cast iron or the synthetic resin is surrounded by the outer pipe made of mortar. What is called a layered tube (see Patent Document 1) is employed.
However, since the cast iron piping material and the fireproof double-layered pipe have a considerable weight, there is a problem in workability at the time of piping construction.

In order to solve the above problems, a fireproof expandable resin composition in which an inorganic expander and / or an organic expander is blended with a base resin has been proposed (Patent Document 2).
This fire-resistant inflatable resin composition is in the form of a sheet or paste, and is wound or applied to the portion of the resin piping material that constitutes the drainage standpipe at the time of construction and inserted through the slab through-hole. When a fire is generated and the inflatable resin composition for fire protection is heated, the inorganic expansion agent and / or the organic expansion agent expands, and the pressure generated between the wall surface of the through hole at that time Thus, the softened resin piping material is crushed to block the entire through hole to prevent fire spread.

  However, in the case of the above-mentioned inflatable resin composition for fire protection, it is possible to reduce the weight, but it is necessary to perform a winding operation or a coating operation at the time of construction. There is also a risk that it will not be able to exert its effect.

Therefore, the inventors of the present invention formed a fire-resistant and heat-expandable pipe joint or a fire-resistant and heat-expandable pipe using the fire-resistant and heat-expandable resin composition containing thermally expandable graphite. We thought that the above problem could be solved by using a fire-resistant and heat-expandable pipe.
However, the pipe joint and pipe of the receptacle connection structure formed using the fireproof and thermally expandable resin composition as described above are connected within the partition through portion, and mortar is filled around the connection portion. In the case of a piping structure, if this connection is heated by a fire, both the pipe joint and the pipe will thermally expand, so the pipe closes and the flame enters the non-fire-generating compartment through the pipe. However, due to the difference in the degree of expansion between the pipe joint and the pipe, a gap is created between the pipe joint, the pipe, the periphery of the connection, and the mortar. There was a risk that smoke would flow into the non-fire-generating side (non-heated side).

JP 2005-282330 A Japanese Patent No. 3133683

  In the present invention, in view of the above circumstances, a pipe joint provided with a receiving port molded from a lightweight resin composition and a piping material molded from a lightweight refractory resin composition are connected within a compartment penetration portion. The purpose is to provide a piping line with high fire resistance.

In order to achieve the above object, a pipe line in a building according to the present invention is a pipe line in a building in which a pipe joint provided with a receiving port and a pipe material are connected within a partition through portion, and the pipe joint There viewing contains 0.1-1 parts by weight of non-heat-expandable graphite with respect to 100 parts by weight of polyvinyl chloride resin, made of thermally expandable graphite-free resin composition (a), the piping material is poly is characterized in that it consists of a thermally expandable graphite viewed contains 1 to 10 parts by weight per 100 parts by weight of vinyl chloride resin, non-heat-expandable graphite-free resin composition (B).

  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 is defined as JIS K using a resin obtained by dissolving a composite vinyl chloride resin in tetrahydrofuran (THF), removing insoluble components by filtration, and then removing the 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 used after being crosslinked 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 non-thermally expandable graphite used in the resin composition (A) 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. In order to keep it, it is preferable to remove volatile matter in advance by a heat drying process.

In the resin composition (A), the amount of non-expandable graphite is 0.1 to 1 part by weight (preferably 0.2 to 0.5 part by weight) with respect to 100 parts by weight of the polyvinyl chloride resin. However, if the non-expandable graphite is less than 0.1 parts by weight, sufficient combustion retardance cannot be obtained at the time of combustion, the desired fire resistance cannot be obtained, and 1 part by weight. This is because 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.

  On the other hand, the resin composition (B) contains 1 to 10 parts by weight (preferably 1 to 8 parts by weight, more preferably 2 to 7 parts by weight) based on 100 parts by weight of the polyvinyl chloride resin. The reason is that if the thermal expansive graphite is less than 1 part by weight, sufficient thermal expansibility may not be obtained during combustion, and the desired fire resistance may not be obtained. When the amount exceeds 10 parts by weight, the structure is excessively expanded by heating, the shape cannot be maintained, and the residue falls off, resulting in a decrease in fire resistance.

Thermally expandable graphite is a conventionally known substance, and powders such as natural scaly graphite, pyrolytic graphite, and quiche graphite are mixed with inorganic acids such as concentrated sulfuric acid, nitric acid, selenic acid, concentrated nitric acid, perchloric acid, perchlorine. It is generally treated with strong oxidants such as acid salts, permanganates, dichromates, hydrogen peroxide, and then neutralized, but the carbonization reaction of polyvinyl chloride resin However, it is preferable to use a pH-adjusted one in the acidic region because it makes the carbonized structure difficult to burn before it is burned as a resin, and heat adjusted to pH 1.5-4.0. More preferably, expandable graphite is used.
That is, if the pH of the thermally expandable graphite is less than 1.5, the acidity is too strong and may cause corrosion of the molding apparatus. If the pH exceeds 4.0, the carbonization of the polyvinyl chloride resin may occur. The acceleration effect may be diminished and sufficient fire resistance may not be obtained.

  The method for adjusting the pH is not particularly limited. Usually, the thermally expandable graphite, as described above, inserts an inorganic acid between the graphite layers by treating the graphite with an inorganic acid and an oxidizing agent. After that, it is washed with water and dried, and in the treated state, it has a pH of 1 or less. Therefore, there is a method of adjusting the pH by washing with water. That is, the pH rises by repeating washing with water and drying.

  Although the particle diameter of the said thermally expansible graphite is not specifically limited, Preferably it is 100-600 micrometers, More preferably, it is 300-500 micrometers. That is, if the particle size becomes too fine, the expansion rate of the refractory resin composition may decrease. 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, may decrease, and the mechanical strength necessary for the tube material may not be obtained.

Moreover, when using what was adjusted to pH 1.5-4.0 as thermally expansible graphite, it is preferable to use a heat stabilizer together.
Although it does not specifically limit as said heat stabilizer, A lead type stabilizer, an organic tin stabilizer, a higher fatty acid metal salt, etc. are mentioned, These are used individually 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 organotin stabilizers include mercaptides such as dibutyltin mercapto, dioctyltin mercapto, and dimethyltin mercapto; malates such as dibutyltin malate, dibutyltin malate polymer, dioctyltin malate, and dioctyltin malate polymer. 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 heat 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.

Moreover, it is preferable to mix | blend an inorganic filler with a resin composition (B) in addition to thermally expansible graphite.
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, if the inorganic filler is less than 1 part by weight, during combustion, the aggregate function is not performed, the shape cannot be maintained, the residue falls off, and the fire resistance may be reduced, If it exceeds 50 parts by weight, the ratio of the polyvinyl chloride resin relative to the entire composition will be low, and the tensile strength may be reduced.

  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.

  In the resin compositions (A) and (B) used in the present invention, flame retardants, lubricants, processing aids, impact modifiers, heat resistance improvers, antioxidants are used as long as their physical properties are not impaired. In addition, additives such as a heat stabilization aid, a light stabilizer, an ultraviolet absorber, a pigment, a plasticizer, and a thermoplastic elastomer may be added.

  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.

As described above, a pipe line in a building according to the present invention is a pipe line in a building in which a pipe joint provided with a receiving port and a pipe material are connected in a partition through portion, and the pipe joint is polychlorinated. see contains 0.1-1 parts by weight of non-heat-expandable graphite with respect to 100 parts by weight of vinyl resin, made of thermally expandable graphite-free resin composition (a), the piping material is polyvinyl chloride the thermally expandable graphite viewed contains 1 to 10 parts by weight per 100 parts by weight of the resin, since the non-heat-expandable graphite-free resin composition (B), workability in lightweight with pipe fitting and the pipe material Well, when heated by a flame during a fire, only the piping material will thermally expand, and the pipe joint side will not thermally expand. Therefore, in the compartment penetrating portion, there is no gap between the pipe joint and the mortar, and unless the pipe joint burns out, smoke in the fire side compartment does not flow into the non-fire side compartment through this gap. . Moreover, since the piping material is formed of a resin composition (B) containing 1 to 10 parts by weight of thermally expandable graphite with respect to 100 parts by weight of the polyvinyl chloride resin, the graphite is heated when heated. It expands and closes the piping material, carbonizes, and prevents burning to other compartments through the pipe for a long time.
If non-thermally expandable graphite is used which has been heat-treated and dried before mixing with the polyvinyl chloride resin, a joint having a good appearance can be stably obtained.

Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof.
FIG. 1 shows one embodiment of a piping line in a building according to the present invention.

As shown in FIG. 1, the in-building piping path 1 includes a pipe joint 2, a standing pipe 3, and a side branch pipe 4.
That is, the pipe joint 2 includes 0.1 to 1 part by weight of non-thermally expandable graphite with respect to 100 parts by weight of the polyvinyl chloride resin, and the non-thermally expandable graphite is mixed with the polyvinyl chloride resin. The resin composition (A) which has been previously heat-treated and dried is injection-molded, and includes a main pipe portion 21 and one side branch pipe connecting portion 22.

The main pipe portion 21 is provided with an upper receiving port 21a and a lower receiving port 21b into which the vertical pipe 3 is fitted, has a cylindrical shape having substantially the same inner diameter as that of the vertical pipe 3 and has a horizontal branch in the middle portion. The pipe connection part 22 is connected in a communication state.
The lateral branch pipe connecting portion 22 includes a receiving port 22a into which the lateral branch pipe 4 is fitted.
Further, in the receiving ports 21a, 21b, and 22a, rubber ring packings that are watertightly contacted to the outer peripheral surfaces of the standing pipes 3 and the side branch pipes 4 that are respectively fitted are mounted. ing.

On the other hand, the standing pipe 3 and the side branch pipe 4 are both made of a resin composition (B) containing 1 to 10 parts by weight of thermally expandable graphite with respect to 100 parts by weight of the polyvinyl chloride resin, and extrusion molding. Obtained by.
And the piping 1 in a building is constructed as follows. That is, the pipe joint 2 is arranged so that the lower end of the main body 21 faces the lower receiving port 21 b in the through hole 51 of the floor slab 5, and the standing pipe is arranged below the floor slab 5 in the through hole 51. After the upper end portion of the pipe 3 is connected to the lower receiving port 21 b in the through hole 51, the mortar 6 is filled in the through hole 51.
The lower end portion of the standing pipe 3 is connected to the upper receiving port 21 a of the main body 21, and the horizontal branch pipe 4 is connected to the receiving port 22 a of the horizontal branch connecting portion 22.

This in-building piping 1 is as described above. When a fire occurs on a certain floor and the drainage pipe on that floor is exposed to a flame, the pipe 3 for the standing pipe is 100 parts by weight of polyvinyl chloride resin. Since it consists of a resin composition (B) containing 1 to 10 parts by weight of thermally expandable graphite, as shown in FIG. 2, the thermally expandable graphite expands and the standing pipe 3a is closed. At the same time, the polyvinyl chloride resin is carbonized. Therefore, it is possible to prevent fire burning from the floor where the fire has occurred for a long time to another floor.
Moreover, the pipe joint 2 includes 0.1 to 1 part by weight of non-thermally expandable graphite with respect to 100 parts by weight of the polyvinyl chloride resin, and the non-thermally expandable graphite is not mixed with the polyvinyl chloride resin. Therefore, even when heated by a flame during a fire, only the vertical pipe 3a is thermally expanded, and the pipe joint 2 side is not thermally expanded. It has sex. Therefore, as long as there is no gap between the pipe joint 2 and the mortar 6 and the pipe joint 2 does not burn off, smoke in the fire side compartment does not flow into the non-fire side compartment through this gap. It is possible to prevent smoke from flowing into the floor for a long time.

  Hereinafter, specific examples of the present invention will be described in detail in comparison with comparative examples.

(Examples 1-7, Comparative Examples 1-3)
Pipe joint 2 having a nominal diameter of 100 A obtained by injection molding using a resin composition using a Henschel mixer (made by Kawada Kogyo Co., Ltd.) having an internal volume of 200 liters shown in Table 1 and an internal volume of the recipe shown in Table 1 As shown in FIG. 3, each of the pipes 3 having a nominal diameter of 100A obtained by extrusion molding using a resin composition obtained by stirring and mixing using a 200 liter Henschel mixer (manufactured by Kawada Kogyo Co., Ltd.) was assembled. Set in fire test furnace X, conduct fire resistance test (according to ISO 834-1 for fire resistance performance test of revised Building Standard Act, constructed on June 1, 2000), start mortar Y and pipe after heating starts Measure the time until the flame comes out from the gap with the joint 2,
Moreover, regarding the pipe joint, the appearance was visually evaluated, and those having a good appearance were indicated as “◯”, and those having a poor appearance (with streak-like irregularities) as “X”.

The length of the pipe protruding into the heating chamber Z was 300 mm, and the flooring Y was a 100 mm thick PC (precast concrete) panel. In FIG. 3, V is a burner, and Q is a thermocouple Q for temperature measurement.
In Table 1, graphite I is non-expandable graphite (product number CPB3, manufactured by Chuetsu Graphite Co., Ltd.) that has been heat-dried at 300 ° C. for 2 hours before mixing, and graphite II has not been heat-dried. Expandable graphite (manufactured by Chuetsu Graphite Co., Ltd., product number CPB3), Graphite III is thermally expanded graphite adjusted to pH 1.5 (manufactured by Tosoh Corp., product number GREP-EG, graphite IV is thermally expanded graphite adjusted to pH 4 (Tosoh Corp.) Manufactured, part number GREP-EG).

  From Table 1 above, if it is the structure of the piping line in the building of the present invention, it has fire resistance performance of 2 hours or more of the judgment criteria of the Ordinance of Section 8 of the Fire Service Act, and has excellent fire resistance performance in the section penetration part. You can see that

  The present invention is not limited to the above embodiments or examples. For example, in the above embodiment, the pipe joint is provided with the lateral branch pipe connecting portion, but may be a socket shape. Further, in the above embodiment, the main pipe portion has a cylindrical shape having substantially the same inner diameter as that of the pipe for standing pipe, but the portion where the horizontal branch pipe connecting portion is provided is thicker than the thicker portion. The lower side may be formed into a funnel shape that is reduced in diameter to the same diameter as the standing pipe, and swirl vanes may be provided inside.

It is sectional drawing showing one embodiment of the piping line in a building concerning this invention. It is a figure explaining the state at the time of the fire outbreak of the piping path of FIG. It is a figure explaining the method of the fire resistance test implemented in the Example. It is a figure showing an example of the conventional piping structure.

Explanation of symbols

1 Pipe line in building 2 Pipe joints 21a, 21b, 22a Receptacle 3 Pipe for standing pipe (pipe material)
4 Horizontal pipes (piping materials)
5 Floor slab (partition penetration)

Claims (2)

A pipe joint provided with a receiving port and a piping material are connected in a partition through-portion, and the pipe joint is made of non-thermally expandable graphite with respect to 100 parts by weight of the polyvinyl chloride resin. see contains 0.1-1 parts by weight, consists of thermally expandable graphite-free resin composition (a), the pipe material is thermally expandable graphite with respect to 100 parts by weight of polyvinyl chloride resin 10 building the pipe line, characterized in that viewed including the parts made of a non-heat-expandable graphite-free resin composition (B).   The piping line in a building according to claim 1, wherein the non-thermally expandable graphite in the resin composition (A) is heat-treated and dried before mixing with the polyvinyl chloride resin.

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