JP4970110B2 - Manufacturing method of fireproof double-layer pipe - Google Patents
Manufacturing method of fireproof double-layer pipe Download PDFInfo
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本発明は、合成樹脂製の内管と、その外周に設置されたモルタル製外管から構成される耐火二層管の製造方法に関するものである。 The present invention relates to a method for producing a refractory double-layer pipe comprising a synthetic resin inner pipe and a mortar outer pipe installed on the outer periphery thereof.
従来から、ビルや集合住宅には、合成樹脂製の内管の外周にモルタル製外管をスライド可能な状態で設置した耐火二層管が排水のために使用されている。この耐火二層管は、外管がモルタル製で、耐火・断熱性を有しているために、火災発生時に、合成樹脂製の内管を伝わって火災が延焼することを防止することができる。しかしながら、合成樹脂製の内管内を排水が流れると、排水音が耐火二層管から漏れるという問題点があり、排水音の問題を解決し、更に、より一層の耐火・断熱性を付与するために、合成樹脂製の内管と、モルタル製の外管の間に、断熱層、防音層、吸音層等を設けた構成の耐火二層管が種々提案されている。 Conventionally, in buildings and apartment houses, a fireproof double-layer pipe in which a mortar outer pipe is slidable on the outer periphery of a synthetic resin inner pipe is used for drainage. This fire-resistant double-layer pipe is made of mortar and has fire resistance and heat insulation properties, so it is possible to prevent the fire from spreading through the inner pipe made of synthetic resin in the event of a fire. . However, when drainage flows through the inner pipe made of synthetic resin, there is a problem that the drainage sound leaks from the fireproof two-layer pipe, in order to solve the problem of drainage sound and to provide further fire resistance and heat insulation. In addition, various fireproof two-layer pipes having a structure in which a heat insulating layer, a soundproof layer, a sound absorbing layer, and the like are provided between an inner pipe made of synthetic resin and an outer pipe made of mortar have been proposed.
例えば、特許文献１には、排水が内部を流れる、樹脂材料で形成された内管と、該内管を被覆する耐火管からなるモルタル、セメントの無機質材料で形成された外管と、を有し、前記内管の外側には、フェルトで形成された吸音層が、及び該吸音層の外側には、ゴム系材料にアスファルト系材料を加えて形成された遮音層が設けられ、内管と外管との間に、前記吸音層と遮音層との２層からなる防音層が設けられたことを特徴とする排水時の管振動防止機能を有する建築設備の排水用防音管材が開示されている。 For example, Patent Document 1 has an inner pipe made of a resin material through which drainage flows, and a mortar made of a refractory pipe covering the inner pipe, and an outer pipe made of a cement inorganic material. A sound absorbing layer formed of felt is provided outside the inner tube, and a sound insulating layer formed by adding an asphalt material to a rubber-based material is provided outside the sound absorbing layer. Disclosed is a soundproofing pipe for drainage of building equipment having a function of preventing pipe vibration during drainage, wherein a soundproofing layer comprising two layers of the sound absorbing layer and the sound insulating layer is provided between the outer pipe and the outer pipe. Yes.
また、特許文献２には、耐火二層管を構成する合成樹脂製の内管の外周に装着される繊維混入モルタル製の外管を、未硬化の繊維混入モルタルからなるモルタルシートと遮音性を有する樹脂シートを重ねた重層シートを中空円筒状に巻き、該樹脂シートの外面と内面がモルタルシートで覆われた中空円筒状の外管で構成したことを特徴とする耐火二層管用遮音形外管（請求項１）；上記樹脂シートの外面及び内面に、上記モルタルシートとの接合を可能にする接合加工を施したことを特徴とする請求項１に記載の耐火二層管用遮音形外管（請求項２）；上記樹脂シートの巻き込み方向の長さは、上記外管を少なくとも一周する長さを有し、上記モルタルシートの巻き込み方向の長さは、該樹脂シートの巻き込み方向の長さよりも長く、その巻き込み方向の前後に樹脂シートの前後端部をモルタルに埋没させるための封入代を備えたことを特徴とする請求項１に記載の耐火二層管用遮音形外管（請求項３）；未硬化の繊維混入モルタルからなるモルタルシート上に遮音性を有する樹脂シートを重ねて重層シートを形成し、この重層シートを、該樹脂シートの外面と内面が該モルタルシートにより覆われるような円筒軸に巻き付け、円筒状の重層シートを乾燥硬化させ、該円筒軸を抜き出して上記外管を製造することを特徴とする耐火二層管用遮音形外管の製造方法（請求項４）；上記重層シートの巻き付け開始側のモルタルシートに、上記円筒軸を少なくとも一周する長さの巻き付け代を設け、上記樹脂シート側の面を内側にして該開始側端部から該円筒軸に巻き付けすることを特徴とする請求項４に記載の耐火二層管用遮音形外管の製造方法（請求項５）が開示されている。 Patent Document 2 discloses that a fiber-mixed mortar outer tube mounted on the outer periphery of a synthetic resin-made inner tube constituting a fireproof double-layered tube has a sound insulation and a mortar sheet made of uncured fiber-mixed mortar. A soundproof double-layered pipe for a fire-resistant double-layer pipe, characterized in that it is composed of a hollow cylindrical outer tube in which a multilayer sheet with a plurality of resin sheets stacked is wound into a hollow cylindrical shape and the outer surface and inner surface of the resin sheet are covered with a mortar sheet Pipe (Claim 1); The outer surface and the inner surface of the resin sheet are subjected to a joining process that enables joining with the mortar sheet. (Claim 2); The length in the winding direction of the resin sheet has a length that makes at least one round of the outer tube, and the length in the winding direction of the mortar sheet is longer than the length in the winding direction of the resin sheet. Too long The sound insulation type outer pipe for fireproof double-layer pipes according to claim 1, further comprising a sealing allowance for burying the front and rear ends of the resin sheet in the mortar before and after the filling direction (Claim 3); A layered sheet is formed by stacking a sound-insulating resin sheet on a mortar sheet made of fiber-mixed mortar, and this layered sheet is wound around a cylindrical shaft so that the outer surface and inner surface of the resin sheet are covered by the mortar sheet A method for producing a sound-insulated outer tube for a fire-resistant double-layer tube, wherein the cylindrical tube is dried and cured, and the cylindrical shaft is extracted to produce the outer tube (Claim 4); The start side mortar sheet is provided with a winding allowance of a length that makes at least one round of the cylindrical shaft, and is wound around the cylindrical shaft from the start side end portion with the surface on the resin sheet side inward. Method for producing a refractory bilayer pipe sound insulation form outside tube according to claim 4 (claim 5) is disclosed.
ここで、耐火二層管どうしを接続・施工する際には、合成樹脂製の内管を接続するための接続部材を設置するため、内管の長さよりも断熱・吸音層及び外管の長さを短くする必要がある。しかしながら、特許文献１に開示されているような排水用防音管材では、外管と防音層とが一体化されているわけではないから、施工において切断加工する際、外管と内管とをスライドさせると、防音層も移動してしまうので、施工しにくいという問題がある。
また、特許文献２に開示されているような耐火二層管用遮音形外管は、内管と外管がスライド可能な状態で構成されているため、施工性は良好であるが、外管は、樹脂シートとその両面に積層されたモルタルシートとからなる少なくとも三層から構成されており、モルタル製外管として所定の強度を得るためには、各モルタル層の厚さを厚くする必要があり、単層のモルタルシートから構成される外管に比して質量が重くなるという問題点がある。
Here, when connecting and constructing the fireproof two-layer pipes, the length of the heat insulation / sound absorbing layer and the outer pipe is longer than the length of the inner pipe because a connecting member for connecting the inner pipe made of synthetic resin is installed. It is necessary to shorten the length. However, in the soundproofing pipe material for drainage as disclosed in Patent Document 1, since the outer pipe and the soundproofing layer are not integrated, when cutting in construction, the outer pipe and the inner pipe are slid. If it does, since a soundproof layer will also move, there exists a problem that it is difficult to construct.
Moreover, since the sound insulation type outer pipe for fireproof double-layer pipes disclosed in Patent Document 2 is configured in such a manner that the inner pipe and the outer pipe are slidable, the workability is good. It is composed of at least three layers consisting of a resin sheet and a mortar sheet laminated on both sides thereof. In order to obtain a predetermined strength as a mortar outer tube, it is necessary to increase the thickness of each mortar layer. There is a problem that the mass becomes heavier than that of an outer tube made of a single layer mortar sheet.
従って、本発明の目的は、充分な耐火・断熱性並びに吸音性を有し、且つ良好な施工性を有する耐火二層管の製造方法を提供することにある。 Accordingly, an object of the present invention is to provide a method for producing a fire-resistant double-layer pipe having sufficient fire resistance / heat insulation properties and sound absorption properties and good workability.
即ち、本発明の耐火二層管の製造方法は、合成樹脂製の内管と、該内管の外周に、長さ方向にスライド可能な状態で設置されたモルタル製外管より構成される耐火二層管の製造方法において、モルタル層形成用のモルタルフィルムを抄造するための抄造装置のエンドレスフェルト上に、断熱・吸音層形成用の断熱・吸音材料を載置し、抄造装置を稼働して、抄造装置のエンドレスフェルトに当接して配置された金属製芯管に断熱・吸音材料を一層巻き取ることにより断熱・吸音層を形成し、次に、断熱・吸音層の外周面に抄造されたモルタルフィルムを所定の厚さなるまで巻き取って、断熱・吸音層とモルタル層とを形成し、次いで断熱・吸音層及びモルタル層が形成された金属製芯管を抄造装置から取り外し、養生・硬化した後、金属製芯管を引抜くことにより、モルタル層からなるモルタル製外管と断熱・吸音層とを一体成形し、得られた一体成形体の内部に、内管を挿入することを特徴とする。 That is, the method for producing a fire-resistant double-layer pipe according to the present invention comprises a fire-resistant construction comprising an inner pipe made of synthetic resin and an outer pipe made of mortar that is installed on the outer periphery of the inner pipe so as to be slidable in the length direction. In the two-layer pipe manufacturing method, heat insulation / sound absorbing material for heat insulation / sound absorbing layer formation is placed on the endless felt of a paper making device for making a mortar film for forming a mortar layer, and the paper making device is operated. The heat insulation / sound absorbing material was formed on the metal core tube placed in contact with the endless felt of the paper making apparatus by further winding the heat insulation / sound absorbing material, and then the paper was made on the outer peripheral surface of the heat insulation / sound absorption layer. The mortar film is wound up to a predetermined thickness to form a heat insulating / sound absorbing layer and a mortar layer, and then the metal core tube on which the heat insulating / sound absorbing layer and the mortar layer are formed is removed from the paper making apparatus and cured / cured. After the metal core By pulling out the, integrally molded and mortar made outer tube and heat insulation and sound absorption layer made of mortar layer, the interior of the resulting molded body, characterized by inserting the inner tube.
また、本発明の耐火二層管の製造方法は、合成樹脂製の内管と、該内管の外周に、長さ方向にスライド可能な状態で設置されたモルタル製外管より構成される耐火二層管の製造方法において、モルタル製外管形成用のモルタルフィルムを抄造するための抄造装置のエンドレスフェルト上に、断熱・吸音層形成用の断熱・吸音材料を載置し、抄造装置を稼働して、抄造装置のエンドレスフェルトに当接して配置された内管に断熱・吸音材料を一層巻き取ることにより断熱・吸音層を形成し、次に、断熱・吸音層の外周面に抄造されたモルタルフィルムを所定の厚さなるまで巻き取って、断熱・吸音層とモルタル層とを形成し、次いで断熱・吸音層及びモルタル層が形成された内管を抄造装置から取り外し、養生・硬化することにより、モルタル層からなるモルタル製外管と断熱・吸音層とを一体成形することを特徴とする。 In addition, the method for manufacturing a fireproof double-layer pipe according to the present invention includes a fireproof composed of a synthetic resin inner pipe and a mortar outer pipe installed on the outer periphery of the inner pipe so as to be slidable in the length direction. In the two-layer pipe manufacturing method, heat insulation / sound absorbing material for heat insulation / sound absorbing layer formation is placed on the endless felt of the paper making machine for making mortar film for forming mortar outer tube, and the paper making machine is operated. Then, a heat insulation / sound absorbing material was formed on the inner pipe placed in contact with the endless felt of the paper making apparatus by further winding up the heat insulating / sound absorbing material, and then the paper was made on the outer peripheral surface of the heat insulating / sound absorbing layer. The mortar film is wound up to a predetermined thickness to form a heat-insulating / sound-absorbing layer and a mortar layer, and then the inner tube on which the heat-insulating / sound-absorbing layer and the mortar layer are formed is removed from the paper making apparatus and cured / cured. By mortar Characterized by integrally molding a mortar made outer tube and heat insulation and sound absorption layer made of.
更に、本発明の耐火二層管の製造方法は、合成樹脂製の内管と、該内管の外周に、長さ方向にスライド可能な状態で設置されたモルタル製外管より構成される耐火二層管の製造方法において、内管の外周面上に断熱・吸音層形成用の断熱・吸音材料を巻き付けて断熱・吸音層を形成した後、モルタル製外管形成用のモルタルフィルムを抄造するための抄造装置のエンドレスフェルト上に当接して配置し、抄造装置を稼働して断熱・吸音層の外周面に抄造されたモルタルフィルムを所定の厚さとなるまで巻き取ってモルタル層を形成し、次いで断熱・吸音層及びモルタル層が形成された前記内管を抄造装置から取り外し、養生・硬化することにより、モルタル層からなるモルタル製外管と断熱・吸音層とを一体成形することを特徴とする。 Furthermore, the method for manufacturing a fireproof double-layer pipe according to the present invention comprises a fireproof composed of a synthetic resin inner pipe and a mortar outer pipe installed on the outer periphery of the inner pipe so as to be slidable in the length direction. In a two-layer pipe manufacturing method, a heat insulating / sound absorbing material for forming a heat insulating / sound absorbing layer is wound around the outer peripheral surface of the inner pipe to form a heat insulating / sound absorbing layer, and then a mortar film for forming a mortar outer pipe is made. Placed in contact with the endless felt of the paper making apparatus, and operated the paper making apparatus to wind up the mortar film made on the outer peripheral surface of the heat insulating and sound absorbing layer to a predetermined thickness to form a mortar layer, Next, the inner tube on which the heat insulating / sound absorbing layer and the mortar layer are formed is removed from the paper making apparatus and cured / cured to integrally form a mortar outer tube made of the mortar layer and the heat insulating / sound absorbing layer. To do.
また、本発明の耐火二層管の製造方法は、耐火・吸音層のモルタル層と接する面に、網状シートを配置することを特徴とする。 Moreover, the manufacturing method of the fireproof two-layer pipe | tube of this invention arrange | positions a net-like sheet | seat in the surface which contact | connects the mortar layer of a fireproof and sound absorption layer, It is characterized by the above-mentioned.
更に、本発明の耐火二層管の製造方法は、耐火・断熱層が無機繊維製のフェルトまたはマットまたはポリエステル繊維のマットから構成されることを特徴とする。 Furthermore, the method for producing a fire-resistant double-layered pipe according to the present invention is characterized in that the fire-resistant and heat-insulating layer is composed of an inorganic fiber felt or mat or a polyester fiber mat.
また、本発明の耐火二層管の製造方法は、無機繊維製のフェルトまたはマットまたはポリエステル繊維のマットの片面に金属フィルムが張り付けられており、金属フィルムが内管と当接するように断熱・吸音層が形成されていることを特徴とする。 In addition, the method for producing a fireproof double-layer pipe according to the present invention has a metal film affixed to one side of an inorganic fiber felt or mat or a polyester fiber mat, and is insulated and sound-absorbed so that the metal film contacts the inner pipe. A layer is formed.
また、本発明の耐火二層管の製造方法は、金属フィルムは、アルミニウム箔であることを特徴とする。 Moreover, the manufacturing method of the fireproof two-layer pipe | tube of this invention is characterized by a metal film being aluminum foil.
本発明の製造方法によれば、耐火・吸音層とモルタル製の外管が一体となっており、耐火・吸音層と外管が、合成樹脂製の内管とがスライド可能な構成を有する耐火二層管を得ることができ、得られた耐火二層管は、充分な耐火・断熱性並びに吸音性を有し、且つ良好な施工性を有するという効果を奏するものである。 According to the manufacturing method of the present invention, the fireproof / sound absorbing layer and the outer tube made of mortar are integrated, and the fireproof / sound absorbing layer and the outer tube are configured to be slidable with the inner tube made of synthetic resin. A two-layer pipe can be obtained, and the obtained fire-resistant two-layer pipe has sufficient fire resistance / heat insulation properties and sound absorption properties, and has an effect of having good workability.
本発明の第１発明に係る耐火二層管の製造方法は、モルタル層形成用のモルタルフィルムを抄造するための抄造装置のエンドレスフェルト上に、断熱・吸音層形成用の断熱・吸音材料を載置し、抄造装置を稼働して、抄造装置のエンドレスフェルトに当接して配置された金属製芯管に断熱・吸音材料を一層巻き取ることにより断熱・吸音層を形成し、次に、断熱・吸音層の外周面に抄造されたモルタルフィルムを所定の厚さなるまで巻き取って、断熱・吸音層とモルタル層とを形成し、次いで断熱・吸音層及びモルタル層が形成された金属製芯管を抄造装置から取り外し、養生・硬化した後、金属製芯管を引抜くことにより、モルタル層からなるモルタル製外管と断熱・吸音層とを一体成形し、得られた一体成形体の内部に、内管を挿入することを構成上の特徴とするものである。 According to a first aspect of the present invention, there is provided a method for producing a fireproof double-layer pipe, comprising: a heat insulating and sound absorbing material for forming a heat insulating and sound absorbing layer on an endless felt of a paper making apparatus for making a mortar film for forming a mortar layer. And then operating the papermaking device to form a heat insulating / sound absorbing layer by further winding up the heat insulating / sound absorbing material on the metal core tube placed in contact with the endless felt of the paper making device. A metal core tube having a heat insulating / sound absorbing layer and a mortar layer formed by winding up the mortar film made on the outer peripheral surface of the sound absorbing layer to a predetermined thickness, and then forming the heat insulating / sound absorbing layer and the mortar layer. Is removed from the paper making machine, cured and hardened, and then the metal core tube is pulled out to integrally form the mortar outer tube composed of the mortar layer and the heat insulating / sound absorbing layer. Insert the inner tube It is an aspect of the configuration and.
また、本発明の第２発明に係る耐火二層管の製造方法は、モルタル製外管形成用のモルタルフィルムを抄造するための抄造装置のエンドレスフェルト上に、断熱・吸音層形成用の断熱・吸音材料を載置し、抄造装置を稼働して、抄造装置のエンドレスフェルトに当接して配置された内管に断熱・吸音材料を一層巻き取ることにより断熱・吸音層を形成し、次に、断熱・吸音層の外周面に抄造されたモルタルフィルムを所定の厚さなるまで巻き取って、断熱・吸音層とモルタル層とを形成し、次いで断熱・吸音層及びモルタル層が形成された内管を抄造装置から取り外し、養生・硬化することにより、モルタル層からなるモルタル製外管と断熱・吸音層とを一体成形することを構成上の特徴とするものである。 Moreover, the method for producing a refractory double-layer pipe according to the second aspect of the present invention comprises a heat insulation / sound absorbing layer forming heat insulation / sound absorbing layer on an endless felt of a paper making apparatus for making a mortar film for forming a mortar outer pipe. Place the sound-absorbing material, operate the papermaking device, form a heat-insulating / sound-absorbing layer by winding the heat-insulating / sound-absorbing material further on the inner tube placed in contact with the endless felt of the paper making device, The inner tube on which the mortar film made on the outer peripheral surface of the heat insulating / sound absorbing layer is wound up to a predetermined thickness to form a heat insulating / sound absorbing layer and a mortar layer, and then the heat insulating / sound absorbing layer and the mortar layer are formed. Is removed from the paper making apparatus, and cured and hardened to integrally form a mortar outer tube made of a mortar layer and a heat insulating and sound absorbing layer.
更に、本発明の第３発明に係る耐火二層管の製造方法は、内管の外周面上に断熱・吸音層形成用の断熱・吸音材料を巻き付けて断熱・吸音層を形成した後、モルタル製外管形成用のモルタルフィルムを抄造するための抄造装置のエンドレスフェルト上に当接して配置し、抄造装置を稼働して断熱・吸音層の外周面に抄造されたモルタルフィルムを所定の厚さとなるまで巻き取ってモルタル層を形成し、次いで断熱・吸音層及びモルタル層が形成された前記内管を抄造装置から取り外し、養生・硬化することにより、モルタル層からなるモルタル製外管と断熱・吸音層とを一体成形することを構成上の特徴とするものである。 Furthermore, in the method for manufacturing a fireproof double-layer pipe according to the third aspect of the present invention, the heat insulating / sound absorbing material for forming a heat insulating / sound absorbing layer is wound around the outer peripheral surface of the inner pipe to form the heat insulating / sound absorbing layer, and then the mortar Place the mortar film on the outer surface of the heat insulation / sound absorbing layer with a predetermined thickness by placing it in contact with the endless felt of the paper making machine for making the outer tube forming mortar film. The inner tube on which the mortar layer is formed by winding up to the next, and then removing the inner tube on which the heat insulation / sound absorbing layer and the mortar layer are formed from the paper making apparatus, curing and curing, the mortar outer tube composed of the mortar layer and the heat insulation / It is a structural feature that the sound absorbing layer is integrally formed.
ここで、本発明の第１発明ないし第３発明において、内管を構成する合成樹脂製管は、特に限定されるものではなく、通常建築設備の排水管として使用されている材質であればよく、例えば塩化ビニル管、耐熱性硬質塩化ビニル管、リサイクル発泡三層硬質塩化ビニル管等を用いることができる。 Here, in the first to third inventions of the present invention, the synthetic resin pipe constituting the inner pipe is not particularly limited as long as it is a material normally used as a drain pipe for building equipment. For example, a vinyl chloride pipe, a heat-resistant hard vinyl chloride pipe, a recycled foamed three-layer hard vinyl chloride pipe, or the like can be used.
また、本発明の第１発明ないし第３発明において、断熱・吸音層形成用の断熱・吸音材料としては、断熱性、吸音性及び弾力性を有する材料であれば特に限定されるものではないが、グラスウールやロックウール等の無機繊維のフェルトやマットまたはポリエステル繊維のマットが好適に使用される。 In the first to third inventions of the present invention, the heat insulating / sound absorbing material for forming the heat insulating / sound absorbing layer is not particularly limited as long as it is a material having heat insulating properties, sound absorbing properties and elasticity. An inorganic fiber felt or mat such as glass wool or rock wool or a polyester fiber mat is preferably used.
なお、断熱・吸音材料の少なくとも片面に金属フィルムを張り付け、金属フィルムと内管とが当接するように構成すれば、モルタル製外管と断熱・吸音層とが一体成形された一体成形体と内管とのスライド性が高まるので好ましい。 If a metal film is attached to at least one surface of the heat insulating and sound absorbing material so that the metal film and the inner tube are in contact with each other, the inner molded body in which the outer tube made of mortar and the heat insulating and sound absorbing layer are integrally formed and the inner This is preferable because the sliding property with the tube is improved.
ここで、金属フィルムとしてはアルミニウム箔を好適に使用することができ、断熱・吸音層の少なくとも片面に金属フィルムが張り付けられた構成とする場合には、例えば、金属フィルム（例えばアルミニウム箔）付きガラスクロスを、該ガラスクロスの金属フィルムとは反対側の面をグラスウールやロックウール等の無機繊維と接着して断熱・吸音材料とすることもできる。 Here, an aluminum foil can be suitably used as the metal film. When the metal film is attached to at least one surface of the heat insulating / sound absorbing layer, for example, a glass with a metal film (for example, an aluminum foil) is used. The cloth can be made into a heat insulating and sound absorbing material by bonding the surface of the glass cloth opposite to the metal film with inorganic fibers such as glass wool or rock wool.
断熱・吸音材料として、グラスウールを用いる場合、そのかさ密度は、１０〜９６ｋｇ／ｍ３、好ましくは２４〜３２ｋｇ／ｍ３の範囲内である。また、ロックウールを用いる場合、そのかさ密度は、２５〜３００ｋｇ／ｍ３、好ましくは４０〜２００ｋｇ／ｍ３の範囲内である。更に、ポリエステル繊維のマットを使用する場合、そのかさ密度は、１０〜９６ｋｇ／ｍ３、好ましくは２４〜３２ｋｇ／ｍ３の範囲内である。ここで、かさ密度が上記上限を超えると、材料が硬くなり、円筒状に成形することが難しいために好ましくなく、また、上記下限未満となると、内管の質量による変形や、耐火二層管を施工する際にモルタル製外管と内管をスライドさせる時の強度が不足するために好ましくない。また、断熱・吸音材料の厚さは、５〜５０ｍｍ、好ましくは１０〜３０ｍｍの範囲内である。ここで、厚さが５０ｍｍを超えると、厚さが増すにつれて耐火二層管の断面積が大きくなり過ぎたり、モルタル製外管の質量が大きくなり過ぎるために好ましくなく、また、厚さが５ｍｍ未満であると、充分な断熱・吸音効果が得られないために好ましくない。 When glass wool is used as the heat insulating and sound absorbing material, its bulk density is in the range of 10 to 96 kg / m 3 , preferably 24 to 32 kg / m 3 . Moreover, when using rock wool, the bulk density is in the range of 25 to 300 kg / m 3 , preferably 40 to 200 kg / m 3 . Further, when a polyester fiber mat is used, its bulk density is in the range of 10 to 96 kg / m 3 , preferably 24 to 32 kg / m 3 . Here, when the bulk density exceeds the above upper limit, the material becomes hard and is not preferable because it is difficult to form a cylindrical shape. When the bulk density is less than the above lower limit, deformation due to the mass of the inner tube or fire-resistant double-layer pipe This is not preferable because the strength when sliding the outer tube and the inner tube made of mortar is insufficient. The thickness of the heat insulating / sound absorbing material is in the range of 5 to 50 mm, preferably 10 to 30 mm. Here, if the thickness exceeds 50 mm, the cross-sectional area of the refractory double-layer tube becomes too large as the thickness increases, or the mass of the mortar outer tube becomes too large, and the thickness is 5 mm. If it is less than 1, it is not preferable because sufficient heat insulation / sound absorption effect cannot be obtained.
また、本発明の第１発明ないし第３発明において、モルタル層形成用のモルタルフィルムは、抄造により形成されたものであるが、モルタルフィルムの抄造方法は特に限定されるものではなく、例えばフローオン方式、丸網式抄造法等を用いることができる。例えば、フローオン式抄造法を用いる場合、金属製芯管は、抄造装置のエンドレスフェルト下面側に設けられた一対のロールの間に、エンドレスフェルト上面側から落とし込み、前記一対のロールで締め付けられた状態でエンドレスフェルト上に当接して配置されているので、エンドレスフェルトの稼働に伴い金属製芯管が回転する構成となっている。そしてエンドレスフェルトを稼働させながらエンドレスフェルト上面にモルタルフィルムを形成するための原料スラリーを供給し、エンドレスフェルト下面側から吸引脱水してモルタルフィルムを形成し、回転している金属製芯管に所定の厚さとなるまで巻き取ってモルタル層を形成した後、エンドレスフェルトの稼働を停止して、前記一対のロールによる金属製芯管の締め付けを解除してモルタル層が形成された金属製芯管が取り出され、また、新たな金属製芯管が配置される。 In the first to third inventions of the present invention, the mortar film for forming the mortar layer is formed by papermaking, but the papermaking method of the mortar film is not particularly limited. A method, a round net type papermaking method, or the like can be used. For example, when using the flow-on papermaking method, the metal core tube is dropped from the upper surface side of the endless felt between a pair of rolls provided on the lower surface side of the endless felt of the papermaking device, and is tightened by the pair of rolls. Since it is disposed in contact with the endless felt in a state, the metal core tube rotates with the operation of the endless felt. The raw slurry for forming the mortar film on the upper surface of the endless felt is supplied while operating the endless felt, and the mortar film is formed by suction dehydration from the lower surface of the endless felt. After winding up to a thickness to form a mortar layer, the operation of the endless felt is stopped, and the metal core tube with the mortar layer formed is taken out by releasing the tightening of the metal core tube by the pair of rolls. In addition, a new metal core tube is arranged.
モルタル製外管を形成するためのモルタルフィルム抄造用の原料スラリーは、セメント及び繊維を主成分とするものである。ここで、セメントとは、普通ポルトランドセメントの他、早強セメント、低熱セメント、中庸熱ポルトランドセメント等を使用することができる。全固形分原料中に占めるセメント量は３０〜９０質量％、好ましくは５０〜８０質量％、特に好ましくは５５〜７５質量％の範囲内である。繊維としては、木質パルプ、ガラス繊維、合成有機繊維（ポリビニルアルコール、アクリル、レーヨン、アラミド等）、けい酸マグネシウム質無機繊維（石綿を除く）等が用いられ、これらを単独または併用することができる。全固形分原料中に占める繊維量は、２〜１５質量％、好ましくは３〜１０質量％、特に好ましくは４〜８質量％の範囲内である。モルタル製外管を形成するための原料スラリーには、上記セメント及び繊維の他に、充填材として、炭酸カルシウム、ワラストナイト、パーライト、ムライト等の粉末を、全固形分原料中に５〜４０質量％、好ましくは８〜３０質量％、特に好ましくは１０〜２０質量％の範囲内で配合することができる。なお、充填材を配合することにより、モルタル製外管の乾燥収縮によるひび割れを防止したり、耐熱性を向上させることができる。上記固形分に水を添加することにより、原料スラリーを調製することができる。ここで、原料スラリー中の固形分濃度は、５〜２０質量％、好ましくは８〜１５質量％、更に好ましくは９〜１２質量％の範囲内である。 A raw material slurry for making a mortar film for forming a mortar outer pipe is mainly composed of cement and fibers. Here, as the cement, in addition to ordinary Portland cement, early-strength cement, low heat cement, intermediate heat Portland cement, and the like can be used. The amount of cement in the total solid content raw material is 30 to 90% by mass, preferably 50 to 80% by mass, and particularly preferably 55 to 75% by mass. As the fiber, wood pulp, glass fiber, synthetic organic fiber (polyvinyl alcohol, acrylic, rayon, aramid, etc.), magnesium silicate inorganic fiber (excluding asbestos) and the like can be used alone or in combination. . The amount of fibers in the total solid content is 2 to 15% by mass, preferably 3 to 10% by mass, and particularly preferably 4 to 8% by mass. In the raw material slurry for forming the outer tube made of mortar, in addition to the cement and fibers, powders such as calcium carbonate, wollastonite, perlite, mullite, etc. are used as a filler in the total solids raw material 5-40. It can mix | blend in the range of the mass%, Preferably it is 8-30 mass%, Most preferably, it is 10-20 mass%. In addition, by mix | blending a filler, the crack by the drying shrinkage | contraction of a mortar outer tube | pipe can be prevented, or heat resistance can be improved. A raw material slurry can be prepared by adding water to the solid content. Here, the solid content concentration in the raw slurry is in the range of 5 to 20% by mass, preferably 8 to 15% by mass, and more preferably 9 to 12% by mass.
モルタルフィルムを積層することにより得られるモルタル層の厚さは、５〜１５ｍｍ、通常６〜７．５ｍｍの範囲内である。モルタル層を直接内管の外周上に形成すると、モルタル層の養生と、養生後に必要に応じて行われる乾燥とにより、モルタル層は収縮するので、モルタル製外管と内管とのスライド性が損なわれ、耐火二層管の施工が困難となる。そこで、本発明の第１発明では、モルタル層の収縮量を考慮した径の金属製芯管を用いてモルタル層を形成し、得られたモルタル製外管に内管を挿入して耐火二層管を製造する。 The thickness of the mortar layer obtained by laminating mortar films is in the range of 5 to 15 mm, usually 6 to 7.5 mm. When the mortar layer is formed directly on the outer circumference of the inner tube, the mortar layer shrinks due to the curing of the mortar layer and the drying performed as necessary after curing, so the slidability of the mortar outer tube and the inner tube is reduced. Damaged and difficult to install fireproof double-layer pipes. Therefore, in the first invention of the present invention, a mortar layer is formed using a metal core tube having a diameter in consideration of the shrinkage amount of the mortar layer, and the inner tube is inserted into the obtained mortar outer tube to form a two-layer fireproof layer. Manufacture tubes.
なお、モルタル層と断熱・吸音層の間には、モルタル層と断熱・吸音層とを一体化し易くするために、網状シートを設置することができる。網状シートとしては、例えば、ポリプロピレン製網状シート［例えば商品名日石コンウェッドネット（新日石プラスト製）］等を用いることができる。また、同様の目的で、断熱・吸音材料のモルタル層と接する面に、凹凸等を付すための加工を施すこともできる。 In addition, in order to make it easy to integrate a mortar layer and a heat insulation and a sound absorption layer between a mortar layer and a heat insulation and a sound absorption layer, a mesh sheet can be installed. As the mesh sheet, for example, a polypropylene mesh sheet [for example, trade name Nisseki Conweed Net (manufactured by Nippon Steel Plast)] or the like can be used. In addition, for the same purpose, it is possible to apply a process for providing irregularities or the like to the surface in contact with the mortar layer of the heat insulating and sound absorbing material.
本発明の第１発明においては、金属製芯管をエンドレスフェルトに当接して配置するために、エンドレスフェルトの稼働を停止している間に、エンドレスフェルト上に、金属製芯管の外周に相当する長さを有する断熱・吸音材料を載置する。そして、エンドレスフェルトを稼働させながら、エンドレスフェルト上面にモルタルフィルムを形成するための原料スラリーを供給すると、まず、金属製芯管の外周面上に断熱・吸音材料が一層巻き取られ、断熱・吸音層が形成され、その外周面上にモルタルフィルムを所定の厚さとなるまで巻き取ることによりモルタル層が形成される。 In the first invention of the present invention, since the metal core tube is disposed in contact with the endless felt, while the operation of the endless felt is stopped, the metal core tube corresponds to the outer periphery of the metal core tube. A heat insulating and sound absorbing material having a length to be mounted is placed. When the raw slurry for forming a mortar film on the upper surface of the endless felt is supplied while the endless felt is in operation, first, the heat insulation / sound absorbing material is wound further on the outer peripheral surface of the metal core tube, and the heat insulation / sound absorption A layer is formed, and a mortar layer is formed on the outer peripheral surface by winding a mortar film until a predetermined thickness is obtained.
本発明の第２発明においては、第１発明の金属製芯管に代えて、合成樹脂製の内管をエンドレスフェルトに当接して配置することを除き、第１発明と同一である。上述のとおり、モルタル層は、養生及び養生後に必要に応じて行われる乾燥により収縮するので、直接内管上にモルタル製外管を形成すると、モルタル製外管と内管とのスライド性が損なわれる恐れがあるが、本発明の第２発明においては、モルタル製外管と内管との間に弾力性を有する断熱・吸音層が設けられ、モルタル製外管と断熱・吸音層とが一体化しており、一方、断熱・吸音層と内管とはスライド可能な状態であるから、モルタル製外管と内管のスライド性を確保することができる。 The second invention of the present invention is the same as the first invention except that instead of the metal core tube of the first invention, an inner tube made of synthetic resin is placed in contact with the endless felt. As described above, the mortar layer shrinks due to curing and drying as necessary after curing, so if the outer mortar tube is formed directly on the inner tube, the slidability between the outer mortar tube and the inner tube is impaired. However, in the second invention of the present invention, a heat insulating and sound absorbing layer having elasticity is provided between the mortar outer tube and the inner tube, and the mortar outer tube and the heat insulating and sound absorbing layer are integrated. On the other hand, since the heat insulating / sound absorbing layer and the inner tube are slidable, the slidability of the mortar outer tube and the inner tube can be ensured.
本発明の第３発明においては、金属製芯管に代えて、断熱・吸音材料を予め内管に巻き付けて断熱・吸音層を形成した内管を用いる構成のため、本発明の第２発明と同様にモルタル製外管と内管のスライド性を確保することができる。 In the third invention of the present invention, instead of the metal core tube, the structure uses an inner tube in which a heat insulating / sound absorbing material is wound around the inner tube in advance to form a heat insulating / sound absorbing layer. Similarly, the slidability of the mortar outer tube and the inner tube can be ensured.
上述のようにして得られた耐火二層管は、断熱・吸音管とモルタル製外管が固定されており、断熱・吸音管と内管とはスライド可能な構成とすることができ、良好な施工性を付与することができる。 The fireproof double-layered tube obtained as described above has a heat insulating / sound absorbing tube and an outer tube made of mortar fixed, and the heat insulating / sound absorbing tube and the inner tube can be configured to be slidable. Workability can be imparted.
以下に実施例を挙げて本発明の耐火二層管の製造方法を更に説明する。
実施例１（第１発明）
モルタル製外管の製造装置としてフローオン式抄造装置を使用し、金属製芯管（外径：１６６．３ｍｍ）を抄造装置のエンドレスフェルトに当接して配置する際に、断熱・吸音層形成用の断熱・吸音材料としてグラスウールマット（かさ密度：２４ｋｇ／ｍ３、寸法：５１５×２０００ｍｍ、厚さ：２５ｍｍ）を抄造装置のエンドレスフェルト上に載置する。次いで、エンドレスフェルトを稼働し、モルタル製外管を形成するための原料として、セメント７２質量％、充填材として炭酸カルシウム９質量％及びパーライト８質量％、繊維原料としてけい酸マグネシウム質無機繊維（石綿を除く）６質量％及び木質パルプ５質量％を使用し、前記原料に水を加えて混合した原料スラリー（固形分濃度：１０質量％）を、エンドレスフェルト上面上に供給し、エンドレスフェルト下面側から吸引脱水してモルタルフィルムを形成した。まず、金属製芯管にグラスウールマットが巻き取られ、断熱・吸音層を形成され、この断熱・吸音層の外周面にモルタルフィルムを所定の厚さとなるまで巻き取ることによりモルタル層が形成された時点で、エンドレスフェルトの稼働を停止して、モルタル層及び断熱・吸音層が巻き取られた金属製芯管を取り外し、７０℃で１．５時間一次蒸気養生した後、金属製芯管を抜き取り、モルタル製外管の内周に断熱・吸音層が一体成形された外径：１８３ｍｍ、内径：１１４ｍｍ、長さ：２０００ｍｍの一体成形体を得た。得られた一体成形体の内部に、外径：１１４ｍｍ、内径：１００ｍｍ、長さ：２１００ｍｍの塩化ビニル製の内管を挿入し、自然養生で２週間乾燥し、耐火二層管を得た。
得られた耐火二層管は、モルタル製外管と、内管とがスライド可能な状態となっており、良好な施工性を有するものであった。
The method for producing a fireproof double-layered tube of the present invention will be further described with reference to the following examples.
Example 1 (first invention)
When a flow-on papermaking machine is used as the mortar outer pipe manufacturing equipment and a metal core pipe (outer diameter: 166.3 mm) is placed in contact with the endless felt of the papermaking equipment, it is used to form a heat insulating and sound absorbing layer. A glass wool mat (bulk density: 24 kg / m 3 , dimensions: 515 × 2000 mm, thickness: 25 mm) is placed on the endless felt of the paper making apparatus. Next, the endless felt is operated, and the raw material for forming the outer tube made of mortar is 72% by mass of cement, 9% by mass of calcium carbonate and 8% by mass of pearlite as filler, and magnesium silicate inorganic fiber (asbestos) as the fiber raw material. The raw material slurry (solid content concentration: 10% by mass) prepared by adding 6% by mass and 5% by mass of wood pulp and adding water to the raw material was mixed on the upper surface of the endless felt, and the lower surface side of the endless felt The mortar film was formed by suction dehydration. First, a glass wool mat was wound around a metal core tube to form a heat insulating / sound absorbing layer, and a mortar layer was formed by winding a mortar film on the outer peripheral surface of the heat insulating / sound absorbing layer to a predetermined thickness. At that time, the operation of the endless felt was stopped, the metal core tube wound with the mortar layer and the heat insulating / sound absorbing layer was removed, and after the primary steam curing at 70 ° C. for 1.5 hours, the metal core tube was removed. An integrally molded body having an outer diameter of 183 mm, an inner diameter of 114 mm, and a length of 2000 mm, in which a heat insulating and sound absorbing layer was integrally formed on the inner periphery of the outer tube made of mortar, was obtained. An inner tube made of vinyl chloride having an outer diameter of 114 mm, an inner diameter of 100 mm, and a length of 2100 mm was inserted into the obtained integrally molded body and dried by natural curing for 2 weeks to obtain a fire-resistant double-layer tube.
The obtained fireproof two-layer pipe was in a state in which the outer pipe made of mortar and the inner pipe were slidable, and had good workability.
実施例２（第２発明）
実施例１において、金属製芯管に代えて塩化ビニル製の内管（外径：１１４ｍｍ、内径：１００ｍｍ、長さ：２１００ｍｍ）を抄造装置のエンドレスフェルトに当接して配置した以外は実施例１と同様にして、内管上に断熱・吸音層を形成し、その外周面にモルタル層を形成した時点で、エンドレスフェルトの稼働を停止してモルタル層及び断熱・吸音層が巻き取られた内管を取り外し、７０℃で１．５時間一次蒸気養生した後、自然養生で２週間乾燥し、耐火二層管を得た。
得られた耐火二層管は、モルタル製外管と、内管とがスライド可能な状態となっており、良好な施工性を有するものであった。
Example 2 (second invention)
In Example 1, instead of a metal core tube, an inner tube made of vinyl chloride (outer diameter: 114 mm, inner diameter: 100 mm, length: 2100 mm) was arranged in contact with the endless felt of the papermaking apparatus. In the same manner as above, when the heat insulating / sound absorbing layer is formed on the inner pipe and the mortar layer is formed on the outer peripheral surface thereof, the operation of the endless felt is stopped and the mortar layer and the heat insulating / sound absorbing layer are wound up. The tube was removed and subjected to primary steam curing at 70 ° C. for 1.5 hours and then dried by natural curing for 2 weeks to obtain a fire-resistant double-layer tube.
The obtained fireproof two-layer pipe was in a state in which the outer pipe made of mortar and the inner pipe were slidable, and had good workability.
実施例３（第３発明）
断熱・吸音層を形成する断熱・吸音材料として、実施例１において使用したグラスウールマットの片面にアルミニウム箔が張り付けられたものを使用し、アルミニウム箔を塩化ビニル製の内管の外周面に当接させて巻き付けた。抄造装置として実施例１の抄造装置を使用し、グラスウールマットが巻き付けられた内管を、実施例１の金属製芯管に代えて抄造装置のエンドレスフェルトに当接して配置した。次いで、エンドレスフェルトを稼働し、実施例１の原料スラリーを実施例１と同様にエンドレスフェルト上面上に供給し、エンドレスフェルト下面側から吸引脱水してモルタルフィルムを形成し、グラスウールマットが巻き付けられた内管に所定の厚さとなるまで巻き取ってモルタル層を形成した時点で、エンドレスフェルトの稼働を停止して、モルタル層及び断熱・吸音層が巻き取られた内管を取り外し、自然養生で２週間乾燥し、耐火二層管を作製した。
得られた耐火二層管は、モルタル製外管と、内管とがスライド可能な状態となっており、良好な施工性を有するものであった。
Example 3 (third invention)
As the heat insulating / sound absorbing material for forming the heat insulating / sound absorbing layer, the glass wool mat used in Example 1 with an aluminum foil attached to one side is used, and the aluminum foil is brought into contact with the outer peripheral surface of the inner tube made of vinyl chloride. Let it wind. The papermaking apparatus of Example 1 was used as the papermaking apparatus, and the inner tube around which the glass wool mat was wound was placed in contact with the endless felt of the papermaking apparatus instead of the metal core tube of Example 1. Next, the endless felt was operated, and the raw material slurry of Example 1 was supplied onto the upper surface of the endless felt in the same manner as in Example 1. The mortar film was formed by suction dehydration from the lower surface of the endless felt, and the glass wool mat was wound. When the mortar layer is formed by winding the inner tube to a predetermined thickness, the operation of the endless felt is stopped, the inner tube wound with the mortar layer and the heat insulating / sound absorbing layer is removed, and natural curing is performed. Dried for a week to produce a fireproof double-layer tube.
The obtained fireproof two-layer pipe was in a state in which the outer pipe made of mortar and the inner pipe were slidable, and had good workability.
実施例４
実施例１において、片面にアルミニウム箔が張り付けられたグラスウールマットをアルミニウム箔が上面となるように抄造装置のエンドレスフェルト上に載置する際に、ポリプロピレン製の網状シートをエンドレスフェルトとグラスウールマットとの間に配置して一体成形体を作製した以外は、実施例１と同様にして耐火二層管を作製した。
得られた耐火二層管は、モルタル製外管と、内管とがスライド可能な状態となっており、良好な施工性を有するものであった。
Example 4
In Example 1, when a glass wool mat having an aluminum foil attached on one side is placed on the endless felt of the papermaking apparatus so that the aluminum foil is on the upper surface, a polypropylene mesh sheet is placed between the endless felt and the glass wool mat. A fire-resistant double-layer tube was produced in the same manner as in Example 1 except that an integral molded body was produced by placing them in between.
The obtained fireproof two-layer pipe was in a state in which the outer pipe made of mortar and the inner pipe were slidable, and had good workability.
従来例
モルタル製外管の製造装置としてフローオン式抄造装置を使用し、金属製芯管を抄造装置のエンドレスフェルトに当接して配置する。次いで、エンドレスフェルトを稼働し、実施例１と同一の原料スラリーをエンドレスフェルト上面上に供給し、エンドレスフェルト下面側から吸引脱水してモルタルフィルムを形成し、金属製芯管に所定の厚さとなるまで巻き取りモルタル層を形成した時点で、エンドレスフェルトの稼働を停止して、モルタル層が巻き取られた金属製芯管を取り外し、７０℃で１．５時間一次養生した後、金属製芯管を抜き取り、外径：１２９ｍｍ、内径：１１６ｍｍ、長さ：２０００ｍｍのモルタル製外管を得た。得られたモルタル製外管の内部に、外径：１１４ｍｍ、内径：１００ｍｍ、長さ：２１００ｍｍの塩化ビニル製の内管を挿入し、自然養生で２週間乾燥し、耐火二層管を得た。
Conventional Example A flow-on papermaking apparatus is used as a manufacturing apparatus for a mortar outer pipe, and a metal core pipe is disposed in contact with an endless felt of the papermaking apparatus. Next, the endless felt is operated, the same raw material slurry as in Example 1 is supplied onto the upper surface of the endless felt, and sucked and dehydrated from the lower surface of the endless felt to form a mortar film, and the metal core tube has a predetermined thickness. When the wound mortar layer is formed, the operation of the endless felt is stopped, the metal core tube wound with the mortar layer is removed, and after the primary curing at 70 ° C. for 1.5 hours, the metal core tube Was extracted to obtain a mortar outer tube having an outer diameter of 129 mm, an inner diameter of 116 mm, and a length of 2000 mm. A vinyl chloride inner tube having an outer diameter of 114 mm, an inner diameter of 100 mm, and a length of 2100 mm was inserted into the obtained mortar outer tube and dried for 2 weeks by natural curing to obtain a fire-resistant two-layer tube. .
次に、実施例１で得られた本発明品及び従来品の耐火二層管について、遮音性比較試験を行った。
遮音性比較試験は、集合住宅の遮音壁などにおいて、遮音性能試験に使用される残響室を使用した。図１に、遮音性比較試験に使用した試験施設の概略図を示す。
残響室の音源室と受音室の間には、厚さ２００ｍｍのコンクリート製壁（３）が設けられている。このコンクリート製壁（３）に試験体となる耐火二層管（１）を通すための貫通孔（孔径：２００ｍｍ）が設けられている。この貫通孔に、長さ２０００ｍｍの耐火二層管（１）を内管（塩化ビニル管）（２）が１００ｍｍ音源室側に露出するように挿通した。コンクリート壁の貫通孔と耐火二層管の隙間は、音が漏れないように油粘土（６）を詰めた。また、耐火二層管（１）の音源室側の端部の内管（２）に、耐火二層管（１）の内部に音を発するようにスピーカー（４）を設置した。耐火二層管の受音室側の端部には、吸音材（材質：グラスウール）（５）を詰めた上で、キャップを取り付け、その接合部に油粘土（６）を充填して耐火二層管（１）の端部を封止した。
受音室側のコンクリート製壁（３）の近傍、並びにコンクリート製壁（３）から３００ｍｍの間隔で、耐火二層管のコンクリート製外管上にマイクロホン（７）を設置した。音源室側のスピーカー（４）から耐火二層管（１）内部に発せられる音圧レベルと、受音室側の各マイクロホン設置点（測定点）で測定される耐火二層管（１）内部から耐火二層管（１）の管壁を通過して漏れ出る空気伝播音の音圧レベルを測定し、各測定点での測定値を平均化した値を音圧レベルとし、この音圧レベルとの差により耐火二層管の製造方法による遮音性能の差異を測定した。各々の中心周波数における音圧レベル差は、以下の通りである。
Next, the sound insulation property comparison test was done about the fireproof two-layer pipe | tube of this invention obtained in Example 1, and the conventional product.
In the sound insulation comparison test, a reverberation room used for a sound insulation performance test was used in a sound insulation wall of an apartment house. FIG. 1 shows a schematic diagram of a test facility used for a sound insulation comparison test.
A concrete wall (3) having a thickness of 200 mm is provided between the sound source room and the sound receiving room of the reverberation room. The concrete wall (3) is provided with a through hole (hole diameter: 200 mm) for passing a fireproof double-layer pipe (1) as a test body. Through this through-hole, a fire-resistant double-layer tube (1) having a length of 2000 mm was inserted so that the inner tube (vinyl chloride tube) (2) was exposed to the 100 mm sound source chamber side. Oil clay (6) was packed in the gap between the through hole of the concrete wall and the fireproof double-layer pipe so that no sound leaked. Moreover, the speaker (4) was installed in the inner tube (2) at the end of the fireproof double-layer tube (1) on the sound source room side so as to emit sound inside the fireproof double-layer tube (1). A sound-absorbing material (material: glass wool) (5) is packed at the end of the sound-receiving chamber side of the fire-resistant double-layer tube, a cap is attached, and the joint is filled with oil clay (6). The end of the layer tube (1) was sealed.
The microphone (7) was installed on the concrete outer pipe of the fireproof double-layer pipe in the vicinity of the concrete wall (3) on the sound receiving room side and at an interval of 300 mm from the concrete wall (3). Sound pressure level emitted from the speaker (4) on the sound source room side into the fireproof double-layer tube (1) and the inside of the fireproof double-layer tube (1) measured at each microphone installation point (measurement point) on the sound receiving room side Measure the sound pressure level of the air-propagating sound that leaks through the pipe wall of the fireproof double-layer pipe (1) and average the measured value at each measurement point as the sound pressure level. The difference of the sound insulation performance by the manufacturing method of the fireproof double-layer pipe was measured by the difference. The sound pressure level difference at each center frequency is as follows.
中心周波数（Ｈｚ） １２５ ２５０ ５００ １０００ ２０００ ４０００
音圧レベル差 本発明品 ７９ ７６ ８０ ８５ ８５ ８７
（ｄＢ） 従来品 ７４ ７２ ７３ ７２ ６４ ５４
Center frequency (Hz) 125 250 500 1000 2000 4000
Sound pressure level difference product of the present invention 79 76 80 85 85 87
(DB) Conventional product 74 72 73 72 64 54
本発明の耐火二層管は、ビルや集合住宅の排水管として好適に使用することができる。 The fireproof two-layer pipe of the present invention can be suitably used as a drain pipe for buildings and apartment houses.
１ 耐火二層管、２ 内管（塩化ビニル管）、３ コンクリート製壁、４ スピーカー、５ 吸音材、６ 油粘土、７ マイクロホン 1 Fireproof double-layer tube, 2 Inner tube (vinyl chloride tube), 3 Concrete wall, 4 Speaker, 5 Sound absorbing material, 6 Oil clay, 7 Microphone
Claims (7)
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| JP5484740B2 (en) * | 2009-01-21 | 2014-05-07 | 昭和電工建材株式会社 | Soundproof synthetic resin pipe and method for producing the same |
| JP5613490B2 (en) * | 2010-08-02 | 2014-10-22 | 昭和電工建材株式会社 | Refractory double-layer pipe and method for producing the same |
| JP5756669B2 (en) * | 2011-04-11 | 2015-07-29 | 昭和電工建材株式会社 | Manufacturing method of fireproof double-layer pipe |
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| JPS63225782A (en) * | 1987-03-12 | 1988-09-20 | 昭和電工株式会社 | Sound-insulating composite pipe |
| JPH05215289A (en) * | 1992-02-04 | 1993-08-24 | Shibazaki:Kk | Silent pipe |
| FI96396C (en) * | 1992-12-28 | 1996-06-25 | Uponor Bv | Process for forming a double-layered plastic tube for material transport and a double-layered plastic tube formed by the method |
| JP3448628B2 (en) * | 1998-05-18 | 2003-09-22 | 株式会社ジェイエスピー | Exterior wall panels and exterior wall structures |
| JP2001074191A (en) * | 1999-09-03 | 2001-03-23 | Asano Slate Co Ltd | Fireproofing three-layer pipe |
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