JP5483937B2

JP5483937B2 - Refractory drainage joint

Info

Publication number: JP5483937B2
Application number: JP2009150675A
Authority: JP
Inventors: 兵衛竹中; 斉河内
Original assignee: Sekisui Chemical Co Ltd
Current assignee: Sekisui Chemical Co Ltd
Priority date: 2009-06-25
Filing date: 2009-06-25
Publication date: 2014-05-07
Anticipated expiration: 2029-06-25
Also published as: JP2011006893A

Description

本発明は、耐火排水集合継手に関する。 The present invention relates to a fireproof drainage collective joint.

集合住宅などの多層建築物の場合、各階の衛生機器等から排出される排水は、各階の衛生機器等から横枝管を介してパイプシャフト内に設けられた排水立管に集められて、下水路に排水されるようになっている。
そして、図１１に示すように、排水立管路１００の床スラブ貫通部３１０においては、床スラブ２００を挟んだ下の階、あるいは上の階で火災が発生した場合においても、火災発生階から上の階あるいは下の階への火炎や煙の流れ込みを防止するために、排水立管路１００の一部を構成する排水集合継手３００の床スラブ貫通部３１０と床スラブ２００に設けられた貫通孔２１０との隙間にモルタル４００を充填するようにしている。図１０中、５００は横枝管、３２０は横枝管接続部である。 In the case of multi-story buildings such as apartment buildings, wastewater discharged from sanitary equipment etc. on each floor is collected from the sanitary equipment etc. on each floor via drainage pipes into a drainage stand provided in the pipe shaft. It is designed to drain into waterways.
As shown in FIG. 11, in the floor slab penetration part 310 of the drainage conduit 100, even when a fire occurs on the lower floor or the upper floor across the floor slab 200, In order to prevent the flow of flames and smoke to the upper floor or the lower floor, the floor slab penetration part 310 of the drainage collective joint 300 and the penetration provided in the floor slab 200 constituting a part of the drainage conduit 100. The mortar 400 is filled in the gap with the hole 210. In FIG. 10, 500 is a lateral branch pipe, and 320 is a lateral branch pipe connecting portion.

ところで、このような床スラブ貫通部に用いられる配管材としては、それ自体に耐火性が要求されるため、鋳鉄製のものや合成樹脂製内管の周囲がモルタル製外管で囲繞された耐火二層集合継手と称されるもの（特許文献１参照）が採用されている。
しかしながら、上記鋳鉄製や耐火二層構造の排水集合継手などは、重量がかなりあるため、配管施工時の施工性に問題がある。 By the way, as a piping material used for such a floor slab penetration part, fire resistance is required for itself, so that the periphery of a cast iron or synthetic resin inner pipe is surrounded by a mortar outer pipe. What is called a two-layer assembly joint (see Patent Document 1) is employed.
However, the cast-iron or fire-resistant double-layer drainage collective joints have a considerable weight, so that there is a problem in workability during pipe construction.

上記のような問題を解決するためには、ベース樹脂に、無機系膨張剤および／または有機系膨張剤が配合されている防火用膨張性樹脂組成物が提案されている（特許文献２参照）。
この防火用膨張性樹脂組成物は、シート状あるいはペースト状をしていて、施工時に排水立管を構成する樹脂配管材の、床スラブ貫通孔に挿通配置される部分に巻回あるいは塗布するようになっていて、火災が発生し、防火用膨張性樹脂組成物が加熱されると、無機系膨張剤および／または有機系膨張剤が膨張し、そのときに貫通孔壁面との間で発生する圧力で、軟化している樹脂配管材を押しつぶして貫通孔全体を閉塞して延焼を防止するようになっている。 In order to solve the above problems, a fire-resistant expansive resin composition in which an inorganic expansive agent and / or an organic expansive agent is blended with a base resin has been proposed (see 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 into the floor 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 is generated between the wall surface of the through hole at that time. With pressure, the softened resin piping material is crushed to block the entire through hole to prevent fire spread.

しかしながら、上記防火用膨張性樹脂組成物の場合、軽量化は図れるのであるが、施工時に巻回作業あるいは塗布作業を行わなければならず、面倒である上、巻回作業や塗布作業の不良を招き、その効果を発揮できないおそれもある。 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 possibility that the effect cannot be exhibited.

そこで、樹脂製の複数の継手構成部材を組み立てて形成され、前記複数の継手構成部材のうち、少なくとも床スラブ貫通部を構成する継手構成部材が、耐火熱膨張性樹脂組成物からなる管状をした耐火膨張層を少なくとも備える耐火熱膨張性樹脂パイプで形成されている耐火排水集合継手が提案されている（特許文献３参照）。 Therefore, a plurality of joint components made of resin are assembled and formed, and among the plurality of joint components, at least the joint components constituting the floor slab penetrating portion have a tubular shape made of a fire-resistant and heat-expandable resin composition. A fireproof drainage collective joint formed of a fireproof and thermally expandable resin pipe having at least a fireproof expansion layer has been proposed (see Patent Document 3).

この耐火排水集合継手は、全ての継手構成部材が樹脂で形成されているので、軽量である。また、床スラブ貫通部を構成する継手構成部材として、耐火熱膨張性樹脂組成物からなる管状をした耐火膨張層を少なくとも備える耐火熱膨張性樹脂パイプを用いるようにしたので、施工時に上記のような防火用膨張性樹脂組成物のシートを巻回したり、防火用膨張性樹脂組成物を塗布したりといった作業を行わなくても、火災時に耐火熱膨張性樹脂パイプが管内を閉塞してスラブの上下階の類焼を防ぐことができる。 This fire-resistant drainage collective joint is lightweight because all joint constituent members are made of resin. In addition, as a joint component constituting the floor slab penetrating portion, a fire-resistant and heat-expandable resin pipe having at least a tubular fire-resistant expansion layer made of a fire-resistant and thermally expandable resin composition is used. Even if there is no work such as winding a sheet of a fire-resistant inflatable resin composition or applying a fire-resistant intumescent resin composition, a fire-resistant and heat-expandable resin pipe closes the inside of the pipe in the event of a fire. It can prevent fires on the upper and lower floors.

ところで、上記のように、配管材そのもので防火措置を可能とするためには、下記の２点が必要である。
１）配管材の燃焼速度を遅延させて、非加熱側に火炎を噴出させないこと。燃焼速度を遅延させるには、配管材そのものの燃焼を防止するとともに、燃焼時に管壁を熱膨張させ、配管材の貫通部内への熱の流入をできるだけ防ぐようにすることが望ましい。すなわち、加熱側において配管材を閉塞させて遮炎することが最良である。また、膨張後の燃焼残渣が脱落しないことがより好ましい。
２）燃焼時に配管材とその外周のモルタルとのシールを保って、非加熱側へ発煙させないこと。 By the way, as described above, the following two points are necessary to enable fire prevention measures with the piping material itself.
1) Delay the combustion rate of the piping material so that no flame is ejected to the non-heated side. In order to delay the combustion rate, it is desirable to prevent combustion of the piping material itself and to thermally expand the tube wall during combustion so as to prevent heat from flowing into the through portion of the piping material as much as possible. That is, it is best to block the piping material on the heating side to shield the flame. Moreover, it is more preferable that the combustion residue after expansion does not fall off.
2) Keep the piping material and the outer mortar seal at the time of combustion, and do not emit smoke to the non-heated side.

しかし、上記先に提案（特許文献３）された排水集合継手においては、耐火熱膨張性樹脂パイプが閉塞し膨張後の燃焼残渣が脱落しないようになるのであるが、床スラブ貫通部が排水立管の内径より大径なものの場合、耐火熱膨張性樹脂パイプの上端部に接続される他の継手構成部材の床スラブより上側に出た部分で熱変形して耐火排水集合継手とモルタルとのシール面に隙間が生じ燃焼時に非加熱側へ発煙する場合がある。
そこで、本発明の発明者らが鋭意検討を重ねた結果、上記耐火熱膨張性樹脂パイプの上側に接続される継手構成部材の射出成形時に発生する継手構成部材の残留ひずみが原因で
あることがわかり、さらに検討を重ねた結果、本発明を完成するに到った。 However, in the drainage joint joint previously proposed (Patent Document 3), the fireproof and thermally expandable resin pipe is blocked and the combustion residue after expansion does not fall off. In the case of a pipe having a diameter larger than the inner diameter of the pipe, it is thermally deformed at a portion protruding from the floor slab of the other joint constituent member connected to the upper end of the fire-resistant and heat-expandable resin pipe, so that There may be a gap on the seal surface, and smoke may be emitted to the non-heated side during combustion.
Therefore, as a result of repeated studies by the inventors of the present invention, the residual strain of the joint constituent member generated during the injection molding of the joint constituent member connected to the upper side of the fire-resistant and heat-expandable resin pipe may be the cause. As a result of further understanding and further studies, the present invention has been completed.

特開２００５−２８２３３０号公報JP 2005-282330 A 特許３１３３６８３号公報Japanese Patent No. 3133683 特開２００９−５７７０５号公報JP 2009-57705 A

本発明は、上記事情に鑑みて、軽量で、床スラブ貫通部において、安定した耐火効果を得られる耐火排水集合継手を提供することを目的としている。 In view of the above circumstances, an object of the present invention is to provide a fireproof drainage collective joint that is lightweight and can obtain a stable fireproof effect in a floor slab penetrating portion.

上記目的を達成するために、本発明にかかる耐火排水集合継手は、複数の樹脂製継手構成部材を組み立てて形成され、前記複数の継手構成部材のうち、第１継手構成部材が、耐火熱膨張性樹脂組成物からなる管状をした耐火膨張層を少なくとも備える耐火熱膨張性樹脂パイプであり、この耐火熱膨張性パイプの上端部が第２継手構成部材の下端部に設けられた受口に嵌合接続されるとともに、前記嵌合接続部を含む耐火熱膨張性樹脂パイプの上端側および前記受口を含む第２継手構成部材の下端側が、床スラブ貫通部となり、前記熱膨張性樹脂パイプの下端部が床スラブ下方に突出するように設置される耐火排水集合継手であって、前記第２継手構成部材が、前記下端部に設けられた受口側の端面を臨む位置にゲートを備えた金型で射出成形して得られることを特徴としている。
In order to achieve the above object, a fireproof drainage collective joint according to the present invention is formed by assembling a plurality of resin joint constituent members, and the first joint constituent member of the plurality of joint constituent members is fireproof thermal expansion. A fire-resistant and thermally expandable resin pipe having at least a tubular fire-resistant expansion layer made of a heat-resistant resin composition, and an upper end portion of the fire-resistant and thermally expandable pipe is fitted in a receptacle provided at a lower end portion of the second joint component member In addition, the upper end side of the fire-resistant and heat-expandable resin pipe including the fitting connection portion and the lower end side of the second joint component member including the receiving port serve as a floor slab penetrating portion, and the heat-expandable resin pipe A fireproof drainage collective joint installed such that the lower end protrudes downward from the floor slab , wherein the second joint constituent member has a gate at a position facing the end surface on the receiving side provided in the lower end. Injection mold It is characterized by being obtained Te.

本発明において、耐火熱膨張性樹脂パイプとしては、ポリ塩化ビニル系樹脂１００重量部に対して、熱膨張性黒鉛を１〜１０重量部の割合で含む耐火熱膨張性樹脂組成物からなる耐火膨張層の単層構造であるもの、あるいは、耐火熱膨張性樹脂パイプが、ポリ塩化ビニル系樹脂１００重量部に対して、熱膨張性黒鉛を１〜１５重量部の割合で含む耐火熱膨張性樹脂組成物からなる耐火膨張層と、この耐火膨張層の内外面を覆うように設けられる熱膨張性黒鉛非含有のポリ塩化ビニル系樹脂組成物からなる被覆層とからなる３層構造であるものが好ましい。
上記ポリ塩化ビニル系樹脂としては、例えば、ポリ塩化ビニル単独重合体；塩化ビニルモノマーと、該塩化ビニルモノマーと共重合可能な不飽和結合を有するモノマーとの共重合体；塩化ビニル以外の（共）重合体に塩化ビニルをグラフト共重合したグラフト共重合体等が挙げられ、これらは単独で使用されてもよく、２種以上が併用されてもよい。又、必要に応じて上記ポリ塩化ビニル系樹脂を塩素化してもよい。 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.

上記塩化ビニルモノマーと共重合可能な不飽和結合を有するモノマーとしては、特に限定されず、例えば、エチレン、プロピレン、ブチレン等のα−オレフィン類；酢酸ビニル、プロピオン酸ビニル等のビニルエステル類；ブチルビニルエーテル、セチルビニルエーテル等のビニルエーテル類；メチル（メタ）アクリレート、エチル（メタ）アクリレート、ブチルアクリレート等の（メタ）アクリル酸エステル類；スチレン、α−メチルスチレン等の芳香族ビニル類；Ｎ−フェニルマレイミド、Ｎ−シクロヘキシルマレイミド等のＮ−置換マレイミド類などが挙げられ、これらは単独で使用されてもよく、２種以上が併用されてもよい。 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.

上記塩化ビニルをグラフト共重合する重合体としては、塩化ビニルをグラフト共重合するものであれば、特に限定されず、例えば、エチレン−酢酸ビニル共重合体、エチレン−酢酸ビニル−一酸化炭素共重合体、エチレン−エチルアクリレート共重合体、エチレン−ブチルアクリレート−一酸化炭素共重合体、エチレン−メチルメタクリレート共重合体、エチレン−プロピレン共重合体、アクリロニトリル−ブタジエン共重合体、ポリウレタン、塩素化ポリエチレン、塩素化ポリプロピレンなどが挙げられ、これらは単独で使用されてもよく、２種以上が併用されてもよい。 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.

上記ポリ塩化ビニル系樹脂の平均重合度は、特に限定されるものではないが、小さくなると成形体の物性低下が起こり、大きくなると溶融粘度が高くなって成形が困難になるので、４００〜１６００が好ましく、６００〜１４００が、特に好ましい。尚、上記平均重合度とは、ポリ塩化ビニル系樹脂をテトラヒドロフラン（ＴＨＦ）に溶解させ、濾過により不溶成分を除去した後、濾液中のＴＨＦを乾燥除去して得た樹脂を試料とし、ＪＩＳＫ−６７２１「塩化ビニル樹脂試験方法」に準拠して測定した平均重合度を意味する。 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”.

上記ポリ塩化ビニル系樹脂の重合方法は、特に限定されず、従来公知の任意の重合方法が採用されてよく、例えば、塊状重合方法、溶液重合方法、乳化重合方法、懸濁重合方法等が挙げられる。 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.

上記ポリ塩化ビニル系樹脂の塩素化方法としては、特に限定されず、従来公知の塩素化方法が採用されてよく、例えば、熱塩素化方法、光塩素化方法等が挙げられる。 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.

上記ポリ塩化ビニル系樹脂はいずれも、樹脂組成物としての耐火性能を阻害しない範囲で、架橋、変性して用いてもよい。この場合、予め架橋、変性した樹脂を用いてもよく、添加剤等を配合する際に、同時に架橋、変性してもよいし、あるいは樹脂に前記成分を配合した後に架橋、変性してもよい。上記樹脂の架橋方法についても、特に限定はなく、ポリ塩化ビニル系樹脂の通常の架橋方法、例えば、各種架橋剤、過酸化物を使用する架橋、電子線照射による架橋、水架橋性材料を使用した方法等が挙げられる。 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.

本発明の耐火熱膨張性樹脂パイプは、火炎等によって加熱されると耐火膨張層が膨張して、管内を閉塞あるいは閉塞に近い状態にすることができるものであれば、耐火膨張層のみの単層のものでも、耐火膨張層の内外面に耐火膨張層の耐火性能を阻害しない範囲で膨張黒鉛を含まない樹脂組成物からなる樹脂層を設けた複層構造とするようにしても構わない。 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.

上記単層構造品の場合、耐火膨張層を形成する耐火熱膨張性樹脂組成物としては、特に限定されないが、ポリ塩化ビニル系樹脂１００重量部に対して、熱膨張性黒鉛を１〜１０重量部の割合で含むものが好ましく、１〜８重量部の割合で含むものがより好ましく、２〜７重量部の割合で含むものがさらに好ましい。すなわち、熱膨張性黒鉛が１重量部未満であると、燃焼時に、十分な熱膨張性が得られず、所望の耐火性が得られないおそれがあり、１０重量部を超えると、加熱により熱膨張しすぎて、その形状を保持できずに残渣が脱落し、耐火性が低下してしまうおそれがある。 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.

一方、複層構造品の場合、耐火膨張層を形成する耐火熱膨張性樹脂組成物としては、特に限定されないが、ポリ塩化ビニル系樹脂１００重量部に対して、熱膨張性黒鉛を１〜１５重量部の割合で含むものが好ましく、１〜１２重量部の割合で含むものがより好ましく、２〜１０重量部の割合で含むものがさらに好ましい。すなわち、熱膨張性黒鉛を熱膨張性黒鉛が１重量部未満であると、燃焼時に、十分な熱膨張性が得られず、所望の耐火性が得られないし、１５重量部を超えると、加熱により熱膨張しすぎて、その形状を保持できずに残渣が脱落し、耐火性が低下してしまうおそれがある。
また、上記のように耐火膨張層がポリ塩化ビニル系樹脂１００重量部に対して、熱膨張性黒鉛を１〜１５重量部の割合で含む耐火熱膨張性樹脂組成物で形成された複層構造品の場合、耐火膨張層の内外面を熱膨張性耐火材料非含有のポリ塩化ビニル系樹脂組成物で被覆した３層構造とすることが好ましい。 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.

上記のような３層構造の複層構造品の場合、耐火管状の内面および外面を被覆する被覆層の厚みが、それぞれ０．２〜２．０ｍｍであることが好ましい。
すなわち、耐火膨張層の内面および外面を被覆する被覆層の厚みが０．２ｍｍ未満であると管としての機械的強度に劣るおそれがあり、２．０ｍｍを超えると耐火性が低下するおそれがある。 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. .

本発明で用いられる熱膨張性黒鉛は、天然鱗状グラファイト、熱分解グラファイト、キッシュグラファイト等の粉末を濃硫酸、硝酸、セレン酸等の無機酸と濃硝酸、過塩素酸、過塩素酸塩、過マンガン酸塩、重クロム酸塩、過酸化水素等の強酸化剤とで、黒鉛の層間に無機酸を挿入する酸処理をした後、ｐＨ調整して得られる炭素の層状構造を維持したままの結晶化合物であって、ｐＨ１．５〜４．０に調整された熱膨張性黒鉛、および、１．３倍膨張温度が１８０℃〜２４０℃の熱膨張性黒鉛を用いることが好ましい。
すなわち、熱膨張性黒鉛のｐＨが１．５未満であると、酸性が強すぎて、成形装置の腐食などを引き起こしやすく、ｐＨが４．０を超えると、ポリ塩化ビニル系樹脂の炭化促進効果が薄れ、十分な耐火性能が得られなくなるおそれがある。 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.

上記熱膨張性黒鉛のｐＨ調整方法は、特に限定されないが、通常、上記のように、原料黒鉛の層間に無機酸を挿入する酸処理をした状態では、ｐＨ１以下になっているため、例えば、酸処理後の黒鉛を水で洗浄して、黒鉛の表面に残存する酸を除去した後、乾燥させる方法が挙げられる。すなわち、熱膨張性黒鉛のｐＨを上昇させるには、水洗と乾燥とを繰り返せばよい。 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.

一方、熱膨張性黒鉛の１．３倍膨張温度が１８０℃未満であると、成形中に熱膨張性黒鉛が膨張してしまうことがあり、管の外観不良を引き起こす上、燃焼時の耐火性が低下してしまうおそれがあり、熱膨張性黒鉛の１．３倍膨張温度が２４０℃を超えると、成形中に熱膨張性黒鉛の膨張が開始してしまうおそれはないものの、燃焼時において、ポリ塩化ビニル系樹脂の熱分解（発泡）が進行し、ポリ塩化ビニル系樹脂の柔軟性が低下してしまった後に、熱膨張性黒鉛が膨張するため、ポリ塩化ビニル系樹脂が、熱膨張性黒鉛の膨張に耐え切れなくなり、バラバラに崩壊してしまうおそれがある。
なお、１．３倍膨張温度とは、加熱炉内を一定温度にして、熱膨張性黒鉛の試料を３０分加熱した後の熱膨張性黒鉛の膨張倍率が、１．３以上になる温度を意味する。また、膨張倍率は、加熱後の試料の体積を加熱前の試料の体積で除することで求められる。 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.

上記熱膨張性黒鉛の粒径は、特に限定されないが、好ましくは１００〜４００μｍであり、さらに好ましくは１２０〜３５０μｍである。すなわち、粒径が細かくなりすぎると、耐火性樹脂組成物の膨張率が低下してしまうおそれがある。一方、粒径が大きくなりすぎると、加熱により組織が熱膨張しすぎて、その形状を保持できずに残渣が脱落し、耐火性が低下してしまうし、耐火性樹脂組成物を配管材としたときの引張強度や扁平強度などの物性が低下してしまい、管材として必要な機械的強度が得られなくなってしまうおそれがある。 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.

また、耐火膨張層を形成する耐火熱膨張性樹脂組成物には、本発明の目的を阻害しない範囲で、必要に応じて安定剤、無機充填剤、難燃剤、滑剤、加工助剤、衝撃改質剤、耐熱向上剤、酸化防止剤、光安定剤、紫外線吸収剤、顔料、可塑剤、熱可塑性エラストマーなどの添加剤が添加されていてもよい。
上記安定剤としては、特に限定されないが、鉛系安定剤、有機スズ安定剤、高級脂肪酸金属塩等が挙げられ、これらが単独であるいは複合して用いられる。 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.

鉛系安定剤としては、例えば、鉛白、塩基性亜硫酸鉛、三塩基性硫酸鉛、二塩基性亜リン酸鉛、二塩基性フタル酸鉛、三塩基性マレイン酸鉛、シリカゲル共沈ケイ酸鉛、二塩基性ステアリン酸鉛、ステアリン酸鉛、ナフテン酸鉛が挙げられる。
また、有機スズ系安定剤としては、例えば、ジブチル錫メルカプト、ジオクチル錫メルカプト、ジメチル錫メルカプトなどのメルカプチド類；ジブチル錫マレート、ジブチル錫マレートポリマー、ジオクチル錫マレート、ジオクチル錫マレートポリマーなどのマレート類；ジブチル錫メルカプトジブチル錫ラウレート、ジブチル錫ラウレートポリマーなどのカルボキシレート類が挙げられる。 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.

高級脂肪酸金属塩（金属石ケン）としては、例えば、ステアリン酸リチウム、ステアリン酸マグネシウム、ステアリン酸カルシウム、ラウリン酸カルシウム、リシノール酸カルシウム、ステアリン酸ストロンチウム、ステアリン酸バリウム、ラウリン酸バリウム、リシノール酸バリウム、ステアリン酸カドミウム、ラウリン酸カドミウム、リシノール酸カドミウム、ナフテン酸カドミウム、２−エチルヘキソイン酸カドミウム、ステアリン酸亜鉛、ラウリン酸亜鉛、リシノール酸亜鉛、２−エチルヘキソイン酸亜鉛、ステアリン酸鉛、二塩基性ステアリン酸鉛、ナフテン酸鉛が挙げられる。 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.

上記安定剤の配合割合は、特に限定されないが、ポリ塩化ビニル系樹脂１００重量部に対して、０．３〜５．０重量部とすることが好ましい。
すなわち、安定剤の配合割合が０．３重量部未満であると、成形時におけるポリ塩化ビニル系樹脂の熱安定性が確保されにくく、成形中に炭化物が出やすくなってしまうおそれがあり、５．０重量部を超えると、燃焼時におけるポリ塩化ビニル系樹脂の炭化促進を阻害して十分な耐火性能が得られなくなるおそれがある。 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.

無機充填剤としては、特に限定されず、例えば、シリカ、珪藻土、アルミナ、酸化亜鉛、酸化チタン、酸化カルシウム、酸化マグネシウム、酸化鉄、酸化錫、酸化アンチモン、フェライト類、水酸化カルシウム、水酸化マグネシウム、水酸化アルミニウム、塩基性炭酸マグネシウム、炭酸カルシウム、炭酸マグネシウム、炭酸亜鉛、炭酸バリウム、ドーンナイト、ハイドロタルサイト、硫酸カルシウム、硫酸バリウム、石膏繊維、ケイ酸カルシウム、タルク、クレー、マイカ、モンモリロナイト、ベントナイト、活性白土、セピオライト、イモゴライト、セリサイト、ガラス繊維、ガラスビーズ、シリカ系バルン、窒化アルミニウム、窒化ホウ素、窒化ケイ素、カーボンブラック、グラファイト、炭素繊維、炭素バルン、木炭粉末、各種金属粉、チタン酸カリウム、硫酸マグネシウム、チタン酸ジルコン酸鉛、アルミニウムボレート、硫化モリブデン、炭化ケイ素、ステンレス繊維、ホウ酸亜鉛、各種磁性粉、スラグ繊維、フライアッシュ、脱水汚泥等が候補に挙げられ、これらのうち、炭酸カルシウム、ケイ酸カルシウム、水酸化カルシウム、酸化カルシウム、炭酸マグネシウム、水酸化マグネシウム、酸化マグネシウム、炭酸バリウム、水酸化アルミニウム、酸化亜鉛、水酸化亜鉛、酸化鉄等の塩基性無機充填剤を用いることが好ましい。
これらは、単独でも、２種以上を混合して用いてもよい。 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.

また、無機充填剤の配合割合は、特に限定されないが、ポリ塩化ビニル系樹脂１００重量部に対して０．３〜５０重量部の割合とすることが好ましく、２〜５重量部の割合とすることが好ましい。すなわち、無機充填剤が０．３重量部未満であると、燃焼時に、骨材的な働きがなされず、その形状を保持できずに残渣が脱落して、耐火性が低下してしまうおそれがあり、５０重量部を超えると、組成物全体に対するポリ塩化ビニル系樹脂の割合が低くなるため、引張強度が低下してしまうおそれがある。 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.

特に、熱膨張性黒鉛として、ｐＨを１．５〜４．０に調整されたものを用いる場合には、上記塩基性無機充填剤をポリ塩化ビニル系樹脂１００重量部に対して０．３〜５．０重量部の割合で配合することが好ましい。すなわち、塩基性無機充填剤の配合割合がポリ塩化ビニル系樹脂１００重量部に対して０．３重量部未満であると、成形時におけるポリ塩化ビニル系樹脂の熱安定性が確保されず、成形中に炭化物が出やすくなってしまい、塩基性化合物が５．０重量部を超えると、燃焼時におけるポリ塩化ビニル系樹脂の炭化促進を阻害することとなり、耐火性能の著しい向上が見られなくなるおそれがある。 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.

上記難燃剤としては、燃焼時の難燃性を高めるためのものであれば特に限定されず、例えば、水酸化アルミニウム、水酸化マグネシウム等の水酸化物、ハイドロタルサイト、二酸化アンチモン、三酸化アンチモン、五酸化アンチモン等の酸化アンチモン、三酸化モリブデン、二硫化モリブデン、アンモニウムモリブデート等のモリブデン化合物、テトラブロモビスフェノールＡ、テトラブロムエタン、テトラブロムエタン、テトラブロムエタン等の臭素系化合物、トリフェニルフォスフェート、アンモニウムポリフォスフェート等のリン系化合物、ホウ酸カルシウム、ホウ酸亜鉛などが挙げられるが、ポリ塩化ビニルの燃焼抑制効果としては、三酸化アンチモンが特に好ましい。アンチモン化合物は、ハロゲン系化合物の存在下では、高温条件のもとで、ハロゲン化アンチモン化合物を作り、燃焼サイクルを抑制させる効果が非常に強く、相乗効果が著しいからである。 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.

難燃剤を併用することにより、燃焼時において、熱膨張性黒鉛の膨張による断熱効果と難燃剤による燃焼遅延効果が相乗効果を発揮して、より効率的に耐火性能を向上させることができる。難燃剤の添加部数は、特に限定されないが、ポリ塩化ビニル系樹脂１００重量部に対して、１重量部以上２０重量部以下、添加されていることが好ましい。難燃剤が１重量部未満であると、十分な相乗効果が得られにくいし、難燃剤が２０重量部を超えて添加されると、成形性や物性が著しく低下してしまうおそれがあるからである。 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.

上記熱安定化助剤としては特に限定されず、例えば、エポキシ化大豆油、リン酸エステル、ポリオール、ハイドロタルサイト、ゼオライト等が挙げられる。これらは単独で使用してもよく、２種以上を併用してもよい。 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.

上記滑剤としては、内部滑剤、外部滑剤が挙げられる。
内部滑剤は、成形加工時の溶融樹脂の流動粘度を下げ、摩擦発熱を防止する目的で使用される。上記内部滑剤としては特に限定されず、例えば、ブチルステアレート、ラウリルアルコール、ステアリルアルコール、エポキシ大豆油、グリセリンモノステアレート、ステアリン酸、ビスアミド等が挙げられる。これらは単独で使用してもよく、２種以上を併用してもよい。
上記外部滑剤は、成形加工時の溶融樹脂と金属面との滑り効果を上げる目的で使用される。外部滑剤としては特に限定されず、例えば、パラフィンワックス、ポリオレフィンワックス、エステルワックス、モンタン酸ワックスなどが挙げられる。これらは単独で使用してもよく、２種以上を併用してもよい。 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.

上記加工助剤としては特に限定されず、例えば重量平均分子量１０万〜２００万のアルキルアクリレート−アルキルメタクリレート共重合体等のアクリル系加工助剤などが挙げられる。上記アクリル系加工助剤としては特に限定されず、例えば、ｎ−ブチルアクリレート−メチルメタクリレート共重合体、２−エチルヘキシルアクリレート−メチルメタクリレート−ブチルメタクリレート共重合体等が挙げられる。これらは単独で使用してもよく、２種以上を併用してもよい。 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.

上記衝撃改質剤としては特に限定されず、例えばメタクリル酸メチル−ブタジエン−スチレン共重合体（ＭＢＳ）、塩素化ポリエチレン、アクリルゴムなどが挙げられる。 The impact modifier is not particularly limited, and examples thereof include methyl methacrylate-butadiene-styrene copolymer (MBS), chlorinated polyethylene, and acrylic rubber.

上記耐熱向上剤としては特に限定されず、例えばα−メチルスチレン系、Ｎ−フェニルマレイミド系樹脂等が挙げられる。 The heat resistance improver is not particularly limited, and examples thereof include α-methylstyrene-based and N-phenylmaleimide-based resins.

上記酸化防止剤としては特に限定されず、例えば、フェノール系抗酸化剤などが挙げられる。 It does not specifically limit as said antioxidant, For example, a phenolic antioxidant etc. are mentioned.

上記光安定剤としては特に限定されず、例えば、ヒンダードアミン系等の光安定剤等が挙げられる。 The light stabilizer is not particularly limited, and examples thereof include hindered amine light stabilizers.

上記紫外線吸収剤としては特に限定されず、例えば、サリチル酸エステル系、ベンゾフェノン系、ベンゾトリアゾール系、シアノアクリレート系等の紫外線吸収剤などが挙げられる。 The ultraviolet absorber is not particularly limited, and examples thereof include salicylic acid ester-based, benzophenone-based, benzotriazole-based, and cyanoacrylate-based ultraviolet absorbers.

上記顔料としては特に限定されず、例えば、アゾ系、フタロシアニン系、スレン系、染料レーキ系等の有機顔料；酸化物系、クロム酸モリブデン系、硫化物・セレン化物系、フェロシアニン化物系などの無機顔料などが挙げられる。 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.

また、上記ポリ塩化ビニル系樹脂組成物には可塑剤が添加されていてもよいが、成形品の耐熱性や耐火性を低下させることがあるため、多量に使用することはあまり好ましくない。上記可塑剤としては特に限定されず、例えば、ジブチルフタレート、ジ-２-エチルヘキシルフタレート、ジ-２-エチルヘキシルアジペート等が挙げられる。 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.

上記熱可塑性エラストマーとしては特に限定されず、例えば、アクリルニトリル−ブタジエン共重合体(ＮＢＲ)、エチレン−酢酸ビニル共重合体(ＥＶＡ)、エチレン−酢酸ビニル−一酸化炭素共重合体(ＥＶＡＣＯ)、塩化ビニル−酢酸ビニル共重合体や塩化ビニル−塩化ビニリデン共重合体等の塩化ビニル系熱可塑性エラストマー、スチレン系熱可塑性エラストマー、オレフィン系熱可塑性エラストマー、ウレタン系熱可塑性エラストマー、ポリエステル系熱可塑性エラストマー、ポリアミド系熱可塑性エラストマー等が挙げられる。これらの熱可塑性エラストマーは、単独で用いられても良いし、２種類以上が併用されても良い。 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.

上記耐火熱膨張性樹脂パイプ以外の継手構成部材の材質としては、特に限定されないが、ポリ塩化ビニル系樹脂１００重量部に対して、非膨張性黒鉛を０．１〜１．０重量部の割合で含むポリ塩化ビニル系樹脂組成物で形成されていることが好ましい。
すなわち、非膨張性黒鉛が０．１重量部未満では、熱によって変形しやすくモルタルとのシール面が保持できず発煙してしまう、場合によっては、燃焼してしまうおそれがあり、１．０重量部を超えると、継手のＪＩＳ物性である偏平強度が確保できなくなってしまうおそれがある。 The material of the joint constituent member other than the fire-resistant and heat-expandable resin pipe is not particularly limited, but the ratio of non-expandable graphite is 0.1 to 1.0 part by weight with respect to 100 parts by weight of the polyvinyl chloride resin. It is preferably formed of a polyvinyl chloride resin composition contained in
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.

上記非膨張性黒鉛の粒径は、特に限定されないが、平均粒径で３００μｍ以下が好まし
い。すなわち、３００μｍ以上では、偏平強度が不足するおそれがある。 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.

上記非熱膨張性黒鉛としては、特に限定されないが、ポリ塩化ビニル系樹脂への混合前に熱乾燥処理されているものが好ましい。
すなわち、市販の黒鉛には、揮発分が付着しており、この揮発分が成形時の温度上昇に
より揮発し、成形品外観が悪化する不具合が発生するおそれがあり、成形品の外観を良好に保つために熱乾燥処理によって揮発分を事前に除去することが好ましい。 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.

本発明にかかる耐火排水集合継手は、複数の樹脂製継手構成部材を組み立てて形成され、前記複数の継手構成部材のうち、第１継手構成部材が、耐火熱膨張性樹脂組成物からなる管状をした耐火膨張層を少なくとも備える耐火熱膨張性樹脂パイプであり、この耐火熱膨張性パイプの上端部が第２継手構成部材の下端部に設けられた受口に嵌合接続されるとともに、前記嵌合接続部を含む耐火熱膨張性樹脂パイプの上端側および前記受口を含む第２継手構成部材の下端側が、床スラブ貫通部となり、前記熱膨張性樹脂パイプの下端部が床スラブ下方に突出するように設置される耐火排水集合継手であって、前記第２継手構成部材が、前記下端部に設けられた受口側の端面を臨む位置にゲートを備えた金型で射出成形して得られるので、軽量で、床スラブ貫通部において、安定した耐火効果を得られます。
すなわち、第２継手構成部材が、この継手構成部材の前記受口の端面を臨む位置にゲートを備えた金型で射出成形して得られるので、この継手構成部材に継手構成部材の内径方向に向かう残留ひずみがなく、加熱時にも熱変形しにくい。したがって、その変形によりモルタルとの間に隙間が発生し、シール面が保持されず発煙してしまうといったことがなくなる。
The fireproof drainage collective joint according to the present invention is formed by assembling a plurality of resin joint constituent members, and the first joint constituent member of the plurality of joint constituent members is a tube made of a fireproof and thermally expandable resin composition. A fire-resistant and heat-expandable resin pipe having at least a fire-resistant and expandable layer, and the upper end portion of the fire-resistant and thermally expandable pipe is fitted and connected to a receiving port provided at the lower end portion of the second joint component member. The upper end side of the fire-resistant and heat-expandable resin pipe including the joint portion and the lower end side of the second joint constituent member including the receiving port serve as a floor slab penetrating portion, and the lower end portion of the thermally expandable resin pipe protrudes below the floor slab a refractory wastewater collection joint which is installed to the second joint component, by injection molding in a mold having a gate at a position facing the end surface of the receiving side provided on the lower portion So it ’s lightweight, In the slab through portion, you get a stable fire effect.
That is, since the second joint component is obtained by injection molding with a mold having a gate at a position facing the end face of the receiving port of the joint component, the inner diameter direction of the joint component is provided on the joint component. There is no residual strain toward the surface, and heat deformation is difficult even during heating. Therefore, a gap is not generated between the mortar due to the deformation, and the sealing surface is not held and smoke is not generated.

本発明にかかる耐火排水集合継手の第１の実施の形態をあらわす断面図である。It is sectional drawing showing 1st Embodiment of the fireproof drainage collective joint concerning this invention. 図１の耐火排水集合継手の各継手構成部材の組み立て前の状態の正面図である。It is a front view of the state before the assembly of each joint structural member of the fireproof drainage collective joint of FIG. 図１の耐火排水集合継手の第２継手構成部材の断面図である。It is sectional drawing of the 2nd joint structural member of the fireproof drainage collective joint of FIG. 図１の耐火排水集合継手の第４継手構成部材〜第６継手構成部材を組み立てた状態の断面図である。It is sectional drawing of the state which assembled the 4th joint structural member-the 6th joint structural member of the fireproof drainage collective joint of FIG. 図１の耐火排水集合継手を用いた排水管路をあらわす断面図である。It is sectional drawing showing the drain pipe using the fireproof drainage collective coupling of FIG. 本発明にかかる耐火排水集合継手の第２の実施の形態をあらわす断面図である。It is sectional drawing showing 2nd Embodiment of the fireproof drainage collective joint concerning this invention. 図６の耐火排水集合継手の各継手構成部材の組み立て前の状態の正面図である。It is a front view of the state before the assembly of each joint structural member of the fireproof drainage collective joint of FIG. 図６の耐火排水集合継手を用いた排水管路をあらわす断面図である。It is sectional drawing showing the drain pipe using the fireproof drainage collective coupling of FIG. 実施例及び比較例の排水集合継手の耐火試験方法を説明する図である。It is a figure explaining the fireproof test method of the drainage collective joint of an Example and a comparative example. 実施例及び比較例で用いた第２継手構成部材のゲート位置を説明する図である。It is a figure explaining the gate position of the 2nd joint component used in the example and the comparative example. 従来の排水管路を説明する図である。It is a figure explaining the conventional drainage pipe line.

以下に、本発明を、その実施の形態をあらわす図面を参照しつつ詳しく説明する。
図１及び図２は、本発明にかかる排水集合継手の第１の実施の形態をあらわしている。 Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof.
1 and 2 show a first embodiment of a drainage collective joint according to the present invention.

図１に示すように、この排水集合継手１は、床スラブ貫通部を構成する耐火熱膨張性樹脂パイプからなる第１継手構成部材１１と、他の継手構成部材としての第２継手構成部材１２、第３継手構成部材１３、第４継手構成部材１４、第５継手構成部材１５、第６継手構成部材１６、第７継手構成部材１７、第８継手構成部材１８、第９継手構成部材１９及び第１０継手構成部材１０を組み合わせて形成されている。
第１継手構成部材１１は、耐火膨張層がポリ塩化ビニル系樹脂１００重量部に対して、熱膨張性黒鉛を１〜１５重量部の割合で含む耐火熱膨張性樹脂組成物で形成された複層構造品の場合、耐火膨張層の内外面を熱膨張性耐火材料非含有のポリ塩化ビニル系樹脂組成物で被覆した３層構造となったパイプ（例えば、積水化学工業社エスロン耐火ＶＰパイプ等の耐火管であり、三層構造の塩ビ管で、内外面の硬質ポリ塩化ビニル層と、高温になると大きく膨張し断熱・耐火層を形成する熱膨張性黒鉛含有特殊配合の中間層からなるパイプで、特開2008-180367号公報に開示されている。-）であって、後述する排水立管Ｐ１より大径になっている。 As shown in FIG. 1, the drainage collective joint 1 includes a first joint constituent member 11 made of a fire-resistant and heat-expandable resin pipe constituting a floor slab penetrating portion, and a second joint constituent member 12 as another joint constituent member. , Third joint constituent member 13, fourth joint constituent member 14, fifth joint constituent member 15, sixth joint constituent member 16, seventh joint constituent member 17, eighth joint constituent member 18, ninth joint constituent member 19, and The tenth joint component member 10 is formed in combination.
The first joint component 11 is a composite material in which the fire-resistant expansion layer is formed of a fire-resistant and heat-expandable resin composition containing 1 to 15 parts by weight of heat-expandable graphite with respect to 100 parts by weight of the polyvinyl chloride resin. In the case of a layer structure product, a pipe having a three-layer structure in which the inner and outer surfaces of the fire-resistant expansion layer are coated with a polyvinyl chloride resin composition not containing a heat-expandable fire-resistant material (eg, Sekisui Chemical Co., Ltd. Eslon fire-resistant VP pipe, etc. This pipe is composed of a three-layer PVC pipe with a hard polyvinyl chloride layer on the inner and outer surfaces, and an intermediate layer with a special composition containing thermally expandable graphite that expands greatly at high temperatures to form a heat-insulating and fire-resistant layer. Therefore, it is disclosed in Japanese Patent Laid-Open No. 2008-180367.-), which has a larger diameter than a drainage standpipe P1 described later.

第２継手構成部材１２は、図１〜図３に示すように、本体部１２ａと、受口１２ｂと、３つの横枝管接続用筒部１２ｃと、を備えている。
本体部１２ａは、下端が少し縮径しているが、殆ど第１継手構成部材１１と略同じ内径をした筒状をしていて、堰止め板１２ｅを内面に備えている。 As shown in FIGS. 1 to 3, the second joint component member 12 includes a main body 12 a, a receiving port 12 b, and three horizontal branch pipe connecting cylinders 12 c.
Although the lower end of the main body portion 12a is slightly reduced in diameter, it has a cylindrical shape with almost the same inner diameter as that of the first joint component member 11, and includes a damming plate 12e on the inner surface.

堰止め板１２ｅは、その設置角度が垂直方向から−３０°〜２０°とされている。設置角度が２０°より傾くと、傾斜板によって旋回された旋回流が十分に堰き止められずに、横枝管への逆流が発生してしまうおそれもがでてくる。また−３０°よりも傾くと受け止めた水の跳ね返りが大きくなり、流れを乱してしまう恐れがあり、管内の圧力変動が大きくなってしまうおそれがある。 The installation angle of the weir plate 12e is set to −30 ° to 20 ° from the vertical direction. If the installation angle is inclined from 20 °, the swirl flow swirled by the inclined plate is not sufficiently dammed, and there is a risk that a backflow to the side branch pipe may occur. In addition, if the angle is more than −30 °, the rebound of the received water is increased, which may disturb the flow, and the pressure fluctuation in the pipe may be increased.

横枝管接続用筒部１２ｃは、本体部１２ａの外壁面から本体部１２ａの管軸に直交する
受口１２ｂは、上記第１継手構成部材１１の外径と略同じ内径をしていて、第１継手構成部材１１の上端部が嵌合接着されている。
そして、この第２継手構成部材１２は、射出成形金型（図示せず）のキャビティの受口１２ｂの端面形成部を臨む位置（図３において矢印で示す位置）に設けられた２点のゲートを介してポリ塩化ビニル系樹脂１００重量部に対して、非膨張性黒鉛を０．１〜１．０重量部の割合で含むポリ塩化ビニル系樹脂組成物をキャビティ内に射出充填されて得られる。 The lateral branch pipe connecting cylinder portion 12c has an inner diameter that is substantially the same as the outer diameter of the first joint component member 11, the receiving port 12b orthogonal to the tube axis of the main body portion 12a from the outer wall surface of the main body portion 12a. The upper end portion of the first joint component member 11 is fitted and bonded.
And this 2nd joint component 12 is a gate of 2 points | pieces provided in the position (position shown by the arrow in FIG. 3) which faces the end surface formation part of the receiving port 12b of the cavity of an injection mold (not shown). Obtained by injection-filling a cavity with a polyvinyl chloride resin composition 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. .

第３継手構成部材１３は、本体部１３ａと、上部受口１３ｃと、下部受口１３ｄとを備えている。
部材本体部１３ａは、その上端から下端に向かって徐々に縮径していて、内面に旋回羽根１３ｂが設けられている。 The third joint component member 13 includes a main body portion 13a, an upper receiving port 13c, and a lower receiving port 13d.
The member main body 13a is gradually reduced in diameter from the upper end to the lower end, and a swirl vane 13b is provided on the inner surface.

上部受口１３ｃは、上記第１継手構成部材１１の外径と略同じ内径をしていて、第１継手構成部材１１の下端部が嵌合接着されている。
下部受口１３ｄは、排水立管Ｐ１の外径と略同じ内径をしている。 The upper receiving port 13c has an inner diameter substantially the same as the outer diameter of the first joint component member 11, and the lower end portion of the first joint component member 11 is fitted and bonded.
The lower receiving port 13d has an inner diameter substantially the same as the outer diameter of the drainage pipe P1.

第４継手構成部材１４は、図１、図２、図４に示すように、嵌合部１４ａと、旋回羽根１４ｂと、旋回羽根支持脚部１４ｃと、筒状立管接続部１４ｄとを備えている。
嵌合部１４ａは、第４継手構成部材１４の上端部より小径で第２継手構成部材１２の本体部１２ａ内に嵌合する筒状をしているとともに、下端部が上端から下端に向かって徐々に内径が縮径してテーパ形状になっている。縮径角度は、嵌合部１４ａの中心軸に対して７．５度で、下端の内径、すなわち最小径がテストボール通過可能な大きさである５８ｍｍ以上になっている。 As shown in FIGS. 1, 2, and 4, the fourth joint component member 14 includes a fitting portion 14 a, a swirl vane 14 b, a swirl vane support leg 14 c, and a cylindrical vertical pipe connection portion 14 d. ing.
The fitting portion 14a has a smaller diameter than the upper end portion of the fourth joint component member 14 and has a cylindrical shape that fits into the main body portion 12a of the second joint component member 12, and the lower end portion is directed from the upper end toward the lower end. The inner diameter is gradually reduced to a tapered shape. The diameter reduction angle is 7.5 degrees with respect to the central axis of the fitting portion 14a, and the inner diameter of the lower end, that is, the minimum diameter is 58 mm or more, which is a size that allows the test ball to pass.

旋回羽根１４ｂは、管軸方向にみた旋回羽根１４ｂの投影面積が排水立管Ｐ１の内部横断面積に対して５％〜３０％の大きさで、傾斜角が２０°〜５０°となるように旋回羽根支持脚部１４ｃに支持されている。 The swirl blade 14b has a projected area of 5% to 30% of the projected area of the swirl blade 14b in the tube axis direction with respect to the internal transverse area of the drainage pipe P1, and an inclination angle of 20 ° to 50 °. It is supported by the swirl blade support leg 14c.

旋回羽根支持脚部１４ｃは、旋回羽根１４ｂの水平方向の幅と略同じ幅で嵌合部１４ａの下端からほぼ延出し、下端縁が旋回羽根１４ｂの傾斜に沿うように傾斜している。
そして、旋回羽根支持面が断面円弧状に形成され、旋回羽根１４ｂを下端縁から少し上側で支持している。 The swirl vane support leg portion 14c has a width substantially the same as the width of the swirl vane 14b and substantially extends from the lower end of the fitting portion 14a, and the lower end edge is inclined so as to follow the inclination of the swirl vane 14b.
The swirl vane support surface is formed in a circular arc shape and supports the swirl vane 14b slightly above the lower edge.

第５継手構成部材１５は、エチレン−プロピレン−ジエンゴム（EPDM）等の通常排水設備に使用されているゴム材料からなるパッキンであって、上端部に排水立管Ｐ１の外周面に水密に密着するリップ部１５ａを有し、その上端面が、第４継手構成部材１４の上端面とほぼ一致するように第４継手構成部材１４に嵌合されている。
また、リップ部１５ａは、下端側に向かって徐々に小径となるように設けられ、上端側が排水立管Ｐ１の外径と略同じか少し大径になっていて、下端側が排水立管Ｐ１の外径より小径となって段部を有し、排水立管Ｐ１の管端部が突き当たり、排水立管Ｐ１の熱伸縮を吸収するようになっている。 The fifth joint component 15 is a packing made of a rubber material such as ethylene-propylene-diene rubber (EPDM) or the like used in normal drainage equipment, and is in close contact with the outer peripheral surface of the drainage standpipe P1 at its upper end. A lip portion 15 a is provided, and the upper end surface of the lip portion 15 a is fitted to the fourth joint constituent member 14 so as to substantially coincide with the upper end surface of the fourth joint constituent member 14.
The lip portion 15a is provided so as to gradually decrease in diameter toward the lower end side, the upper end side is substantially the same as or slightly larger than the outer diameter of the drainage standpipe P1, and the lower end side of the drainage standpipe P1. The outer diameter is smaller than the outer diameter and has a stepped portion. The pipe end of the drainage standpump P1 comes into contact with it and absorbs thermal expansion and contraction of the drainage standpipe P1.

第６継手構成部材１６は、第４継手構成部材１４の上端部に外嵌され、一端に設けられたフランジ部１６ａによって、第５継手構成部材１５の第４継手構成部材１４からの離脱を防止するようになっている。
そして、第４継手構成部材１４〜第６継手構成部材１６は、図４に示すように、予め、組み立てた一体化したのち、第４継手構成部材１４の嵌合部１４ａを第２継手構成部材１２の本体部１２ａに嵌合接着することができる。 The sixth joint component member 16 is externally fitted to the upper end portion of the fourth joint component member 14, and the flange portion 16 a provided at one end prevents the fifth joint component member 15 from being detached from the fourth joint component member 14. It is supposed to be.
As shown in FIG. 4, the fourth joint constituent member 14 to the sixth joint constituent member 16 are assembled and integrated in advance, and then the fitting portion 14 a of the fourth joint constituent member 14 is replaced with the second joint constituent member. The 12 main body portions 12a can be fitted and bonded.

第７継手構成部材１７は、一端部が第２継手構成部材１２の横枝管接続用筒部１２ｃに嵌合接着されるとともに、他端部が拡径している。
第８継手構成部材１８は、エチレン−プロピレン−ジエンゴム（EPDM）等の通常排水設備に使用されているゴム材料からなるパッキンであって、第７継手構成部材１７の拡径した他端部に嵌合され、横枝管Ｐ２の外周面に水密に密着する。 One end of the seventh joint component 17 is fitted and bonded to the side branch pipe connecting cylinder 12c of the second joint component 12, and the other end is enlarged in diameter.
The eighth joint component 18 is a packing made of a rubber material used in normal drainage equipment such as ethylene-propylene-diene rubber (EPDM), and is fitted to the other end of the seventh joint component 17 whose diameter has been expanded. And tightly contacted with the outer peripheral surface of the lateral branch pipe P2.

第９継手構成部材１９は、第７継手構成部材１７の拡径部に外嵌され、一端に設けられたフランジ部１９ａによって、第８継手構成部材１８の第６継手構成部材１６からの離脱を防止するようになっている。
第１０継手構成部材１０は、第２継手構成部材１２の横枝管Ｐ２を接続しない横枝管接続用筒部１２ｃに嵌合し横枝管接続用筒部１２ｃを封止している。 The ninth joint component member 19 is externally fitted to the enlarged diameter portion of the seventh joint component member 17, and the eighth joint component member 18 is separated from the sixth joint component member 16 by a flange portion 19 a provided at one end. It comes to prevent.
The tenth joint constituent member 10 is fitted to the side branch pipe connecting cylinder portion 12c that does not connect the side branch pipe P2 of the second joint constituent member 12 and seals the side branch pipe connection cylinder portion 12c.

また、上記第３継手構成部材１３、第４継手構成部材１４、第６継手構成部材１６、第７継手構成部材１７、第９継手構成部材１９及び第１０継手構成部材１０は、いずれもポリ塩化ビニル系樹脂１００重量部に対して、非膨張性黒鉛を０．１〜１．０重量部の割合で含むポリ塩化ビニル系樹脂組成物を射出成形して得られる。なお、これらを射出成形する場合のゲート位置は特に限定されない。 The third joint component member 13, the fourth joint component member 14, the sixth joint component member 16, the seventh joint component member 17, the ninth joint component member 19, and the tenth joint component member 10 are all polychlorinated. It can be obtained by injection molding a polyvinyl chloride resin composition containing 0.1 to 1.0 parts by weight of non-expandable graphite with respect to 100 parts by weight of vinyl resin. In addition, the gate position in the case of injection-molding these is not specifically limited.

そして、この耐火排水集合継手１は、図５に示すように、多層階建築物の排水立管路の各階の横枝管合流部に用いられ、以下のように施工される。
すなわち、第１継手構成部材１１及び第１継手構成部材１１と第２継手構成部材１２の嵌合接続部を含む部分を床スラブＳの貫通孔Ｓ１に臨ませた状態で設置され、下側の階の排水立管Ｐ１（例えば、市販品である積水化学工業社製のエスロン耐火ＶＰパイプが使用できる）を第３継手構成部材１３の下部受口１３ｄに嵌合させて接着する。
また、第６継手構成部材５を介して上側の階の排水立管Ｐ１の下端部を第５継手構成部材１５に嵌合させる。 And this fireproof drainage collective joint 1 is used for the side branch pipe junction part of each floor of the drainage standing pipe of a multi-story building, as shown in FIG. 5, and is constructed as follows.
That is, the first joint component member 11 and the first joint component member 11 and the portion including the fitting connection portion of the second joint component member 12 are installed in a state of facing the through hole S1 of the floor slab S, and the lower side The floor drainage pipe P <b> 1 (for example, commercially available ESLON refractory VP pipe manufactured by Sekisui Chemical Co., Ltd. can be used) is fitted into the lower receiving port 13 d of the third 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.

つぎに、床スラブ貫通孔Ｓ１にモルタルＭを充填し、第１継手構成部材１１及び第１継手構成部材１１と第２継手構成部材１２の嵌合接続部を含む部分をモルタルＭ内に埋設する。
そして、第９継手構成部材１９、第８継手構成部材１８を介して横枝管Ｐ２の端部を第７継手構成部材１７内に挿入して横枝管Ｐ２を接続する。 Next, the floor slab through-hole S1 is filled with mortar M, and a portion including the first joint constituent member 11 and the fitting joint of the first joint constituent member 11 and the second joint constituent member 12 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.

この耐火排水集合継手１は、上記のようになっており、第１継手構成部材１１が耐火熱膨張性樹脂パイプであるので、下の階で火災が発生し、立管路部分が炎によって加熱されると、第１継手構成部材１１中の熱膨張性黒鉛が膨張し、第１継手構成部材１１が閉塞状態となる。したがって、上の階への類焼や煙の流入を防止できる。
しかも、第２継手構成部材１２が、射出成形金型（図示せず）のキャビティの受口１２ｂの端面形成部を臨む位置（図３において矢印で示す位置）に設けられた２点のゲートを介してポリ塩化ビニル系樹脂１００重量部に対して、非膨張性黒鉛を０．１〜１．０重量部の割合で含むポリ塩化ビニル系樹脂組成物をキャビティ内に射出充填されて得られるので、第１継手構成部材１１の閉塞部分が熱の滞留部となり、第２継手構成部材１２の床スラブＳより上側の部分がこの滞留熱に曝されても熱変形しにくい。
したがって、モルタルＭとのシール面が長時間保持されて発煙することがない。 This fireproof drainage collective joint 1 is as described above, and since the first joint component 11 is a fireproof and heat-expandable resin pipe, a fire occurs on the lower floor, and the vertical pipe portion is heated by flame. Then, the thermally expandable graphite in the first joint component member 11 expands, and the first joint component member 11 enters a closed state. Therefore, it is possible to prevent incineration or smoke from entering the upper floor.
Moreover, the two joint members 12 are provided with two gates provided at positions (positions indicated by arrows in FIG. 3) facing the end face forming portion of the cavity receiving port 12b of the injection mold (not shown). Since a polyvinyl chloride resin composition containing non-expandable graphite at a ratio of 0.1 to 1.0 part by weight with respect to 100 parts by weight of the polyvinyl chloride resin is injected and filled into the cavity. The closed portion of the first joint component member 11 becomes a heat retaining portion, and even if the portion above the floor slab S of the second joint component member 12 is exposed to this retained heat, it is difficult to be thermally deformed.
Therefore, the sealing surface with the mortar M is held for a long time and does not emit smoke.

図６及び図７は、本発明にかかる耐火排水集合継手の第２の実施の形態をあらわしている。
図６及び図７に示すように、この耐火排水集合継手２は、床スラブ貫通部を構成する耐火熱膨張性樹脂パイプからなる第１継手構成部材２１と、他の継手構成部材としての第２継手構成部材２２、第３継手構成部材２３、第４継手構成部材１４、第５継手構成部材１５、第６継手構成部材１６、第７継手構成部材（ブッシュ）２４、第８継手構成部材２５、第９継手構成部材２６及び第１０継手構成部材２７を組み合わせて形成されている。 6 and 7 show a second embodiment of the fireproof drainage collective joint according to the present invention.
As shown in FIGS. 6 and 7, the fireproof drainage collective joint 2 includes a first joint constituent member 21 made of a fireproof and thermally expandable resin pipe constituting the floor slab penetrating portion, and a second joint constituent member. Joint component 22, third joint component 23, fourth joint component 14, fifth joint component 15, sixth joint component 16, seventh joint component (bush) 24, eighth joint component 25, The ninth joint component member 26 and the tenth joint component member 27 are formed in combination.

第１継手構成部材２１は、耐火膨張層がポリ塩化ビニル系樹脂１００重量部に対して、熱膨張性黒鉛を１〜１５重量部の割合で含む耐火熱膨張性樹脂組成物で形成された複層構造品の場合、耐火膨張層の内外面を熱膨張性耐火材料非含有のポリ塩化ビニル系樹脂組成物で被覆した３層構造となったパイプ（例えば、市販品である積水化学工業社製のエスロン耐火ＶＰパイプが使用できる）であって、排水立管Ｐ１と同内径になっている。
第２継手構成部材２２は、本体部２２ａと、上部受口２２ｂと、下部受口２２ｃと、横枝管接続用筒部２２ｄとを備えている。 The first joint component member 21 is a composite material in which 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 layer structure product, a pipe having a three-layer structure in which the inner and outer surfaces of the fire-resistant expansion layer are coated with a polyvinyl chloride resin composition not containing a heat-expandable fire-resistant material (for example, a commercial product manufactured by Sekisui Chemical Co., Ltd.) The ESLON refractory VP pipe can be used) and has the same inner diameter as the drainage pipe P1.
The second joint component member 22 includes a main body portion 22a, an upper receiving port 22b, a lower receiving port 22c, and a horizontal branch pipe connecting cylindrical portion 22d.

本体部２２ａは、排水立管Ｐ１と同内径になっていて、その側面に２つの横枝管接続用筒部２２ｄが連設されている。
上部受口２２ｂは、第４継手構成部材１４の嵌合部１４ａが嵌合接着されている。
下部受口２２ｃは、上記第１継手構成部材２１の上端部が嵌合接着されている。
２つの横枝管接続用筒部２２ｄは、軸が直交するように設けられている。 The main body portion 22a has the same inner diameter as the drainage standpipe P1, and two side branch pipe connecting cylinder portions 22d are connected to the side surface of the main body portion 22a.
The fitting part 14a of the fourth joint component 14 is fitted and bonded to the upper receiving port 22b.
The upper end of the first joint component 21 is fitted and bonded to the lower receiving port 22c.
The two horizontal branch pipe connecting cylindrical portions 22d are provided so that their axes are orthogonal to each other.

第３継手構成部材２３は、ソケット形状をしていて、上部に第１継手構成部材２１の下端部が嵌合接着されている。 The third joint component member 23 has a socket shape, and the lower end portion of the first joint component member 21 is fitted and bonded to the upper part.

第４継手構成部材１４〜第６継手構成部材１６は、第１の実施の形態と同様になっている。 The fourth joint component member 14 to the sixth joint component member 16 are the same as those in the first embodiment.

第７継手構成部材２４は、一端部が第２継手構成部材２２の一方の横枝管接続用筒部２２ｄに嵌合接着されるとともに、他端部が拡径している。また、第７継手構成部材２４は、横枝管接続孔２４ａが偏芯して設けられている。
第８継手構成部材２５は、エチレン−プロピレン−ジエンゴム（EPDM）等の通常排水設備に使用されているゴム材料からなり、第７継手構成部材２４の横枝管接続孔２４ａに嵌合され、横枝管Ｐ２の外周面に水密に密着するリップ部２５ａを有している。 One end portion of the seventh joint component member 24 is fitted and bonded to one horizontal branch pipe connecting cylinder portion 22d of the second joint component member 22, and the other end portion has an enlarged diameter. Further, the seventh joint component member 24 is provided with a lateral branch pipe connection hole 24a eccentric.
The eighth joint constituent member 25 is made of a rubber material that is normally used in drainage facilities such as ethylene-propylene-diene rubber (EPDM), and is fitted into the side branch pipe connection hole 24a of the seventh joint constituent member 24, It has a lip portion 25a that tightly adheres to the outer peripheral surface of the branch pipe P2.

第９継手構成部材２６は、第７継手構成部材２４の拡径部に外嵌され、一端に設けられた偏芯フランジ部２６ａによって、第８継手構成部材２５の第７継手構成部材２４からの離脱を防止するようになっている。
第１０継手構成部材２７は、キャップであって、他方の横枝管接続用筒部２２ｄに嵌合接着されている。 The ninth joint component member 26 is externally fitted to the enlarged diameter portion of the seventh joint component member 24, and the eccentric flange portion 26 a provided at one end from the seventh joint component member 24 of the eighth joint component member 25. It is designed to prevent withdrawal.
The tenth joint component member 27 is a cap, and is fitted and bonded to the other side branch pipe connecting cylinder portion 22d.

なお、第２継手構成部材２２、第３継手構成部材２３、第４継手構成部材１４、第６継手構成部材１６、第７継手構成部材２４、第９継手構成部材２６及び第１０継手構成部材２７は、いずれもポリ塩化ビニル系樹脂１００重量部に対して、非膨張性黒鉛を０．１〜１．０重量部の割合で含むポリ塩化ビニル系樹脂組成物を射出成形して得られる。なお、これらを射出成形する場合のゲート位置は特に限定されない。 The second joint constituent member 22, the third joint constituent member 23, the fourth joint constituent member 14, the sixth joint constituent member 16, the seventh joint constituent member 24, the ninth joint constituent member 26, and the tenth joint constituent member 27. Are obtained by injection molding a polyvinyl chloride resin composition 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. In addition, the gate position in the case of injection-molding these is not specifically limited.

この耐火排水集合継手２は、図８に示すように、排水立管Ｐ１、第１継手構成部材２１及び第２継手構成部材２２の本体部２２ａが同じ内径であるので、上記第１の実施の形態の効果に加え、排水立管路をスリム化することができるという優れた利点を備えている。 As shown in FIG. 8, the refractory drainage collective joint 2 has the same inner diameter as the main body 22a of the drainage pipe P1, the first joint constituent member 21, and the second joint constituent member 22, so that the first embodiment is implemented. In addition to the effect of the form, it has an excellent advantage that the drainage duct can be slimmed.

（実施例１）
図９に示す各部の寸法が以下のとおりである、上記第１の実施の形態の耐火排水集合継手１について、図９に示す耐火試験炉Ｆにより、耐火試験（平成１２年６月１日に施行された改正建築基準法の耐火性能試験の評価方法，ＩＳＯ８３４-１に従う）を実施したところ、加熱開始後、床スラブＳの上方に白煙が発生するまで１４０分以上かかるとともに、第２継手構成部材１２は、その本体部１２ａの極端な変形はみられなかった。
なお、床スラブＳは、１００ｍｍ厚さのＰＣ（プレキャストコンクリート）パネルを用いた。また、図９中、Ｂはバーナー、ＴＣは温度測定用の熱電対である。
Ｌ₁＝１００ｍｍ、Ｌ₂＝２５ｍｍ、Ｌ₃＝４５ｍｍ、ｄ₁＝１４０ｍｍ、ｄ₂＝１５０ｍｍ Example 1
The dimensions of the respective parts shown in FIG. 9 are as follows. The fireproof drainage collective joint 1 of the first embodiment is subjected to a fireproof test (on June 1, 2000) by the fireproof test furnace F shown in FIG. After the start of heating, it took 140 minutes or more to generate white smoke above the floor slab S, and the second joint. As for the structural member 12, the extreme deformation | transformation of the main-body part 12a was not seen.
As the floor slab S, a PC (precast concrete) panel having a thickness of 100 mm was used. In FIG. 9, B is a burner, and TC is a thermocouple for temperature measurement.
L ₁ = 100 mm, L ₂ = 25 mm, L ₃ = 45 mm, d ₁ = 140 mm, d ₂ = 150 mm

（比較例１）
第２継手構成部材１２として、図１０（ａ）に矢印で示す位置に設けられた２点のゲートから射出成形をしたものを用いた以外は、実施例１と同様にして第１の実施の形態と同じ形状の耐火排水集合継手を得た。そして、得られた耐火排水集合継手１について、実施例１と同様にして、耐火試験を行ったところ、床スラブＳの上方に白煙が１２０分で発生した。しかし、第２継手構成部材１２の本体部１２ａの極端な変形はみられなかった。
( Comparative Example 1 )
The first embodiment is the same as in the first embodiment except that the second joint component member 12 is formed by injection molding from two gates provided at positions indicated by arrows in FIG. 10A. A fireproof drainage joint with the same shape as the shape was obtained. And when the fireproof drainage collective joint 1 obtained was subjected to a fireproof test in the same manner as in Example 1, white smoke was generated above the floor slab S in 120 minutes. However, no extreme deformation of the main body 12a of the second joint component 12 was observed.

（比較例２）
第２継手構成部材１２として、図１０（ｂ）に矢印で示す位置に設けられた２点のゲートから射出成形をしたものを用いた以外は、実施例１と同様にして第１の実施の形態の耐火排水集合継手１を得た。そして、得られた耐火排水集合継手１について、実施例１と同様にして、耐火試験を行ったところ、第２継手構成部材１２の本体部１２ａの変形によってモルタルとの間に隙間が発生し、９０分で床スラブＳの上方に白煙が発生した。
(Comparative Example 2 )
The first embodiment is the same as in the first embodiment except that the second joint component member 12 is formed by injection molding from two gates provided at positions indicated by arrows in FIG. 10B. A refractory drainage collective joint 1 in the form was obtained. And when the fireproof drainage joint 1 obtained was subjected to a fireproof test in the same manner as in Example 1, a gap was generated between the second joint constituent member 12 and the mortar due to the deformation of the main body portion 12a. White smoke was generated above the floor slab S in 90 minutes.

（比較例３）
第２継手構成部材１２として、図１０（ｃ）に矢印で示す位置に設けられた１点のゲートから射出成形をしたものを用いた以外は、実施例１と同様にして第１の実施の形態の耐火排水集合継手１を得た。そして、得られた耐火排水集合継手１について、実施例１と同様にして、耐火試験を行ったところ、第２継手構成部材１２の本体部１２ａの変形によってモルタルとの間に隙間が発生し、９０分で床スラブＳの上方に白煙が発生した。
(Comparative Example 3 )
The first embodiment is the same as in the first embodiment, except that the second joint component member 12 is formed by injection molding from a single gate provided at the position indicated by the arrow in FIG. A refractory drainage collective joint 1 in the form was obtained. And when the fireproof drainage joint 1 obtained was subjected to a fireproof test in the same manner as in Example 1, a gap was generated between the second joint constituent member 12 and the mortar due to the deformation of the main body portion 12a. White smoke was generated above the floor slab S in 90 minutes.

（比較例４）
第２継手構成部材１２として、ゲート位置を本体部１２ａの横枝管接続用筒部１２ｃの中心軸と同じ高さ位置の横枝管接続用筒部１２ｃが設けられていない部分にゲート位置を設けて射出成形をしたものを用いた以外は、実施例１と同様にして第１の実施の形態の耐火排水集合継手１を得た。そして、得られた耐火排水集合継手１について、実施例１と同様にして、耐火試験を行ったところ、第２継手構成部材１２の本体部１２ａの変形によってモルタルとの間に隙間が発生し、１１０分で床スラブＳの上方に白煙が発生した。
(Comparative Example 4 )
As the second joint component 12, the gate position is set at a portion where the side branch pipe connecting cylinder part 12c at the same height as the central axis of the side branch pipe connecting cylinder part 12c of the main body part 12a is not provided. A fireproof drainage collective joint 1 according to the first embodiment was obtained in the same manner as in Example 1 except that an injection molded product was used. And when the fireproof drainage joint 1 obtained was subjected to a fireproof test in the same manner as in Example 1, a gap was generated between the second joint constituent member 12 and the mortar due to the deformation of the main body portion 12a. White smoke was generated above the floor slab S in 110 minutes.

（実施例２）
上記第２の実施の形態の耐火排水集合継手２について、実施例１と同様の条件で耐火試験を行ったところ、床スラブＳの上方に白煙が発生するまで１５０分以上かかるとともに、第２継手構成部材２２は、その本体部２２ａの極端な変形はみられなかった。
(Example 2 )
When the fireproof drainage joint 2 of the second embodiment was subjected to a fireproof test under the same conditions as in Example 1, it took 150 minutes or more until white smoke was generated above the floor slab S. The joint component 22 did not show extreme deformation of its main body 22a.

（比較例５）
第２継手構成部材２２として、本体部２２ａの横枝管接続用筒部２２ｄの反対側の外壁面を臨む位置にゲートを設けて射出成形をしたものを用いた以外は、実施例３と同様にして第１の実施の形態の耐火排水集合継手２を得た。そして、得られた耐火排水集合継手１について、実施例１と同様にして、耐火試験を行ったところ、第２継手構成部材２２の本体部２２ａの変形によってモルタルとの間に隙間が発生し、１００分で床スラブＳの上方に白煙が発生した。 (Comparative Example 5 )
The second joint component 22 is the same as that of Example 3 except that a gate is provided at a position facing the outer wall surface of the main body 22a opposite to the side branch pipe connecting cylindrical portion 22d and injection molding is performed. Thus, the refractory drainage collective joint 2 of the first embodiment was obtained. And when the fireproof drainage joint 1 obtained was subjected to a fireproof test in the same manner as in Example 1, a gap was generated between the second joint component 22 and the mortar due to the deformation of the main body portion 22a. White smoke was generated above the floor slab S in 100 minutes.

１、２耐火排水集合継手
１０、２７第１０継手構成部材（他の継手構成部材）
１１第１継手構成部材（耐火熱膨張性樹脂パイプ）
１２第２継手構成部材（他の継手構成部材）
１３第３継手構成部材（他の継手構成部材）
１４第４継手構成部材（他の継手構成部材）
１５第５継手構成部材（他の継手構成部材）
１６第６継手構成部材（他の継手構成部材）
１７第７継手構成部材（他の継手構成部材）
１８第８継手構成部材（他の継手構成部材）
１９第９継手構成部材（他の継手構成部材）
Ｓ床スラブ
Ｓ１貫通孔
Ｍモルタル 1, 2, Refractory drainage collective joint 10, 27 Tenth joint component (other joint component)
11 First joint component (fireproof and thermally expandable resin pipe)
12 Second joint component (other joint component)
13 Third joint component (other joint components)
14 Fourth joint component (other joint components)
15 Fifth joint component (other joint components)
16 6th joint component (other joint components)
17 7th joint component (other joint components)
18 Eighth joint component (other joint components)
19 Ninth joint component (other joint components)
S Floor slab S1 Through hole M Mortar

Claims

複数の樹脂製継手構成部材を組み立てて形成され、前記複数の継手構成部材のうち、第１継手構成部材が、耐火熱膨張性樹脂組成物からなる管状をした耐火膨張層を少なくとも備える耐火熱膨張性樹脂パイプであり、この耐火熱膨張性パイプの上端部が第２継手構成部材の下端部に設けられた受口に嵌合接続されるとともに、前記嵌合接続部を含む耐火熱膨張性樹脂パイプの上端側および前記受口を含む第２継手構成部材の下端側が、床スラブ貫通部となり、前記熱膨張性樹脂パイプの下端部が床スラブ下方に突出するように設置される耐火排水集合継手であって、
前記第２継手構成部材が、前記下端部に設けられた受口側の端面を臨む位置にゲートを備えた金型で射出成形して得られることを特徴とする耐火排水集合継手。
Fire resistant thermal expansion comprising a plurality of plastic joint components, wherein the first joint component among the plurality of joint components is provided with at least a tubular fireproof expansion layer made of a fireproof and thermally expandable resin composition. A fire-resistant and heat-expandable resin, the upper end portion of the fire-resistant and heat-expandable pipe being fitted and connected to a receptacle provided in the lower end portion of the second joint component. A fireproof drainage collective joint installed such that the upper end side of the pipe and the lower end side of the second joint constituent member including the receiving port become a floor slab penetrating portion, and the lower end portion of the thermally expandable resin pipe protrudes below the floor slab Because
The fire-resistant drainage collective joint, wherein the second joint component member is obtained by injection molding with a mold having a gate at a position facing an end face on the receiving end provided at the lower end .

第２継手構成部材が、横枝管接続部を備えている請求項１に記載の耐火排水管継手。
The fireproof drainage pipe joint according to claim 1, wherein the second joint component member includes a lateral branch pipe connection portion .

耐火熱膨張性樹脂パイプが、ポリ塩化ビニル系樹脂１００重量部に対して、熱膨張性黒鉛を１〜１０重量部の割合で含む耐火熱膨張性樹脂組成物からなる耐火膨張層の単層構造である請求項１または請求項２に記載の耐火排水集合継手。 A single-layer structure of a fire-resistant and expandable resin pipe comprising a fire-resistant and heat-expandable resin composition containing 1 to 10 parts by weight of heat-expandable graphite with respect to 100 parts by weight of a polyvinyl chloride resin. The fireproof drainage collective joint according to claim 1 or 2, wherein

耐火熱膨張性樹脂パイプが、ポリ塩化ビニル系樹脂１００重量部に対して、熱膨張性黒鉛を１〜１５重量部の割合で含む耐火熱膨張性樹脂組成物からなる耐火膨張層と、この耐火膨張層の内外面を覆うように設けられる熱膨張性黒鉛非含有のポリ塩化ビニル系樹脂組成物からなる被覆層とからなる３層構造である請求項１または請求項２に記載の耐火排水集合継手。 The fire-resistant and heat-expandable resin pipe is composed of a fire-resistant and thermally-expandable resin composition containing 1 to 15 parts by weight of heat-expandable graphite with respect to 100 parts by weight of the polyvinyl chloride resin, and this fire-resistant layer. The fireproof drainage assembly according to claim 1 or 2, which has a three-layer structure comprising a coating layer made of a polyvinyl chloride resin composition containing no thermally expansible graphite and provided so as to cover the inner and outer surfaces of the expanded layer. Fittings.

耐火熱膨張性樹脂パイプ以外の継手構成部材がポリ塩化ビニル系樹脂１００重量部に対して、非膨張性黒鉛を０．１〜１．０重量部の割合で含むポリ塩化ビニル系樹脂組成物で形成されている請求項１〜請求項４のいずれかに記載の耐火排水集合継手。 A polyvinyl chloride resin composition containing a non-expandable graphite in a proportion of 0.1 to 1.0 part by weight with respect to 100 parts by weight of the polyvinyl chloride resin as a joint constituent member other than the fire-resistant and heat-expandable resin pipe The fireproof drainage collective joint according to any one of claims 1 to 4, which is formed.