JP2004229454A - Long covering material for fireproof treatment, and fireproof structure using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a covering material for fireproof treatment which is thin, light-weight, and easy to wrap around cable-protecting tubes, and will not lose fire resistance, even after it suffers a fire, and to provide a fireproof structure for cable protecting tubes using it. <P>SOLUTION: A ceramic fiber blanket 12 (fire-resistant material) and a felt-like heat insulating material 14 mainly composed of polymetaphenyleneisophthalamide fiber are laminated. The thus obtained laminate is covered with a nonwoven fabric 16, to obtain the covering material 10 for fireproof treatment. The covering material 10 for fireproof treatment is wrapped around cable protecting tubes 18, with the fire-resistant material 12 being positioned outside the heat insulating material 14. Then the covering material is covered with a protective cover 30 made of a steel plate. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【００３４】次に、上記の耐火処理構造で、耐火処理用被覆材１０のセラミックファイバブランケット１２の厚さを２５ｍｍ、フェルト状断熱材１４の厚さを１０ｍｍに固定し、フェルト状断熱材１４の成分（メタ型アラミド繊維とポリエステル繊維の配合比率）を変えた場合の、耐火性能とケーブル保護管への巻付け易さを調べた。その結果を表２に示す。
【００３５】
【表２】

【００３６】この結果によれば、メタ型アラミド繊維とポリエステル繊維の配合比率は、メタ型アラミド繊維が６０〜９０重量％の範囲が好ましく（９０重量％を超えても耐火性能、巻付け易さは同じで、価格が高くなるだけ）、性能、価格の両面から見ると、７０〜８０重量％の範囲にすることがより好ましい。
【００３７】次に、上記の耐火処理構造で、耐火処理用被覆材１０のフェルト状断熱材１４として耐熱グラスフェルトを用いた場合について、耐火試験を行なった。使用した耐熱グラスフェルトは、厚さ８ｍｍ、密度１５０ｋｇ／ｍ^２である。その試験結果を、他の試験結果と共に図７に示す。図７において、本発明品２が耐熱グラスフェルトを用いた場合であり、本発明品１はメタ型アラミド繊維を主成分とする耐熱フェルトを用いた場合（図５の試験結果と同じ）であり、従来品は厚さ５０ｍｍのセラミックファイバブランケットのみを用いた場合である。
【００３８】この試験結果によれば、フェルト状断熱材として耐熱グラスフェルトを用いると、メタ型アラミド繊維を主成分とする耐熱フェルトを用いた場合より、断熱性能は低下するが、３０分経過時点でのケーブル温度をほぼ目標の６０℃程度に保つことができる。
【００３９】
【発明の効果】以上説明したように本発明に係る耐火処理用被覆材は、従来のセラミックファイバブランケットのみの耐火処理用被覆材に比べ、厚さが薄く、軽量で、長尺体への巻付けが容易である。またこの耐火処理用被覆材を用いた本発明に係る耐火処理構造は、ＪＩＳ規格を十分に満足する耐火性能を有すると共に、火災に遭った後も耐火性能が失われることがなく、施工後の保守が容易である。
【図面の簡単な説明】
【図１】本発明に係る長尺体の耐火処理用被覆材の一実施形態を示す、（Ａ）は正面図、（Ｂ）は側面図、（Ｃ）は（Ａ）のＣ−Ｃ線拡大断面図。
【図２】図１の耐火処理用被覆材をケーブル保護管に巻き付けた状態を示す、（Ａ）は一部切開側面図、（Ｂ）は（Ａ）のＢ−Ｂ線拡大断面図。
【図３】図２のように巻き付けた耐火処理被覆材の端面突き合わせ部に巻付ける連結帯を示す、（Ａ）は平面図、（Ｂ）は（Ａ）のＢ−Ｂ線拡大断面図。
【図４】図１の耐火処理用被覆材を用いた本発明に係る耐火処理構造の一実施形態を示す断面図。
【図５】本発明に係る耐火処理構造の一実施例の耐火性能試験結果を示すグラフ。
【図６】図５の耐火性能試験をしたものについて、再び耐火性能試験をした結果を示すグラフ。
【図７】本発明に係る耐火処理構造の一実施例及び他の実施例の耐火性能試験結果を、従来例の耐火性能試験結果と共に示すグラフ。
【符号の説明】
１０：耐火処理用被覆材
１２：セラミックファイバブランケット
１４：フェルト状断熱材
１６：不織布
１８：ケーブル保護管
２０：光ケーブル
２２Ａ、２２Ｂ：面ファスナー
２４Ａ、２４Ｂ：面ファスナー
２６：連結帯
２８：ガラスクロステープ
３０：防護カバー
３０Ａ、３０Ｂ：半割部材
３２：フランジ部
３４：ビス[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fireproofing coating material used for fireproofing a long body such as a cable protection tube, and a fireproofing structure using the same.
[0002]
2. Description of the Related Art In recent years, construction of information boxes has been carried out on main national roads connecting cities in order to improve communication infrastructure. Information BOX is usually installed underground, but cable protection pipes are installed instead in bridge sections and tunnel sections where underground installation is not possible. When installing a cable protection tube, if the cable protection tube is left exposed, there is a risk of damage to the internal cable in the event of a fire, so it is necessary to apply a fireproof treatment.
A conventional fireproof structure is generally a structure in which a ceramic fiber blanket with a thickness of 50 mm is wound around the outer periphery of a cable protection tube and the outer periphery is covered with a stainless steel plate with a thickness of 0.3 mm.
However, the 50 mm thick ceramic fiber blanket used in the past has a weight of 6.5 kg / m ^2, and the cable protection tube is installed in a narrow place such as the underside of the bridge. Therefore, there is a problem that the work of winding the ceramic fiber blanket around the cable protection tube is very difficult, takes time, and increases the construction cost.
As an improvement of this point, a three-layer structure in which a first heat insulating layer, a heat absorbing material containing a liquid or gel substance in a bag, and a second heat insulating layer are laminated. A fireproofing coating material has been proposed (for example, Patent Document 1).
[0006]
[Patent Document 1] Japanese Patent Application Laid-Open No. 11-46430
However, in the case of a fireproof coating using a heat-absorbing material containing moisture, once a fire (including heating by a bonfire) is encountered, the bag breaks and the moisture evaporates. As a result, fire resistance is lost. For this reason, after construction, it is necessary to periodically check whether there are any places where a fire has occurred, and if a place where a fire has occurred is found, the fireproof coating must be replaced with a new one. There's a problem.
An object of the present invention is a fireproof treatment covering material that is thin and lightweight, can be easily wound around a long body, and does not lose its fireproof performance after a fire. An object of the present invention is to provide a fireproof structure for a long body using the same.
[0009]
Means for Solving the Problems To achieve this object, a covering material for refractory treatment of a long body according to the present invention is formed by laminating an inorganic fiber refractory material and a heat-resistant felt-like heat insulating material. The laminated body is covered with a cloth-like or film-like material envelope.
Specifically, the coating material for fireproof treatment according to the present invention is such that the fireproof material is a ceramic fiber blanket, and the heat insulating material is mainly composed of polymetaphenylene isophthalamide fiber (hereinafter referred to as meta-type aramid fiber). It is preferable to use a heat-resistant felt.
The heat-resistant felt to be used preferably contains 60 to 90% by weight of meta-aramid fiber and polyester fiber.
In the fireproof coating material according to the present invention, the fireproof material may be a ceramic fiber blanket, and the heat insulating material may be a heat resistant glass felt made of glass fiber.
The fireproof coating material according to the present invention has a structure in which a hook-and-loop fastener is attached to the outer cover so that the state can be maintained when the fireproof coating material is wound around a long body. Is preferred.
In the fireproof coating material according to the present invention, hook-and-loop fasteners are attached to positions corresponding to both ends of the outer peripheral surface in the axial direction when the fireproof coating material is wound around a long body. More preferably, it is configured.
Next, in the long fire-resistant structure according to the present invention using the above-described fire-resistant coating material, the fire-resistant coating material as described above is arranged so that the fire-resistant material is outside the heat insulating material. It is characterized by being wrapped around and covered with a steel plate protective cover.
The long-body fire-resistant treatment structure according to the present invention corresponds to both ends of the outer peripheral surface in the axial direction of the outer cover when the fire-resistant coating material is wound around the long body as the fire-resistant coating material. Using a piece with hook and loop fastener attached at the position, wrapping multiple sheets of this fireproof coating so that the end face is abutted in the longitudinal direction of the long body, and at the end face butting part of the fireproof coating A configuration in which a connecting band formed by sewing a surface fastener on one side of a cloth-like tape is wound with the surface fastener inside, so as to straddle the surface fasteners at both ends in the axial direction of the outer circumferential surface of the adjacent fireproof coating material. It is preferable to do.
[0017]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.
FIG. 1 shows an embodiment of a covering material for fireproof treatment of a long body according to the present invention. The fireproof coating material 10 is formed by laminating a ceramic fiber blanket 12 and a felt-like heat insulating material 14 mainly composed of a meta-type aramid fiber, and covering the laminated body with a nonwoven fabric 16 (a jacket). The nonwoven fabric 16 is sewn so as to enclose the laminate.
As shown in FIG. 2, the coating material 10 for fireproofing is wound around a cable protection tube 18 with the ceramic fiber blanket 12 on the outside and the felt-like heat insulating material 14 on the inside, and the ceramic fiber blanket 12 is wrapped around the fireproof layer. The felt-shaped heat insulating material 14 constitutes a heat insulating layer. The felt-like heat insulating material 14 mainly composed of a meta-type aramid fiber has a high heat insulating performance and a high heat resistance performance of 400 ° C. although it is thin. For this reason, if it is disposed on the inner layer side, the ceramic fiber blanket 12 on the outer layer side only needs to ensure fire resistance, so that the thickness can be made sufficiently thin, and as a result, the thickness of the entire fireproof coating material 10 is increased. The thickness can be reduced and the weight can be reduced. Moreover, since the laminated body of the ceramic fiber blanket 12 and the felt-like heat insulating material 14 is covered with the nonwoven fabric 16 and is formed as one thin cocoon, it can be easily wound around the cable protection tube 18. Reference numeral 20 denotes a cable (for example, an optical cable) drawn into the cable protection tube 18.
The non-woven fabric 16 encasing the laminate is provided with hook-and-loop fasteners 22A and 22B on both ends in the winding direction so that the wrapping condition can be maintained when the fireproof coating material 10 is wound around the cable protection tube 18. Is sewn. One of the hook-and-loop fasteners 22A and 22B is male and the other is female. In addition, another hook-and-loop fastener 24 </ b> A is sewn at a position corresponding to both ends of the outer peripheral surface in the axial direction when the fireproof coating material 10 is wound around the cable protection tube 18 of the nonwoven fabric 16.
Therefore, the covering material 10 for fireproof treatment can be kept in the winding state by simply winding it around the cable protection tube 18 and joining the surface fasteners 22A and 22B as shown in FIG. Can be performed easily and efficiently.
When a plurality of the refractory coatings 10 are continuously wound in the longitudinal direction of the cable protective tube 18, the end faces of the adjacent refractory coatings 10 are butted as shown in FIG. Wrap as you go. Then, since the hook-and-loop fasteners 24A and 24A located at the ends of the adjacent fireproof coating materials 10 are adjacent to each other, the connecting band 26 shown in FIG. 3 is wound around the hook-and-loop fasteners 24A and 24A.
The connecting band 26 is obtained by sewing a surface fastener 24B on one side of a glass cloth tape 28. The surface fastener 24B is joined to the surface fasteners 24A and 24A. The connecting band 26 has a width extending over the adjacent surface fasteners 24 </ b> A and 24 </ b> A in FIG. 2A and a length corresponding to the outer peripheral length of the fireproof coating material 10. When such a connecting band 26 is wound so that the surface fastener 24B is joined to the surface fasteners 24A and 24A on the fireproofing coating material 10 side, the adjacent fireproofing coating materials 10 are firmly connected, and the end face butting portion Can be ensured, and the outer peripheral surface of the connected fire-resistant treatment covering material 10 can be kept substantially flat in the longitudinal direction.
As shown in FIG. 4, a protective cover 30 made of a stainless steel plate is placed on the outer periphery of the connected fireproof coating material 10. The protective cover 30 is of a split type, and is composed of two half members 30A and 30B having the same shape. The half members 30A and 30B each have flange portions 32 projecting outward on both side edges. After the half members 30A and 30B are attached to the outer periphery of the fireproof coating material 10 from both sides, the opposing flange portions 32 and 32 are tightened with screws 34 to complete the fireproof structure of the cable protection tube. Of the flange portions 32 and 32 facing each other, one flange portion 32 is bent in an L shape so that the tip end portion thereof covers the tip end of the other flange portion 32 as shown in the figure. In this way, it is possible to prevent rainwater from entering the protective cover 30.
Since this fireproof structure is completely dry and does not contain water, even if a fire occurs, the ceramic fiber blanket 12 and the felt-like heat insulating material 14 in the protective cover 30 are less likely to be damaged. The fireproof coating material 10 can be used as it is without replacement.
Specifically, the felt-like heat insulating material 14 used for the fireproof coating material 10 includes 60 to 90% by weight of meta-type aramid fibers, and the balance is made of polyester fibers. If the blending ratio of the meta-type aramid fiber is larger, the heat insulation performance is higher, but the price is higher. Moreover, although the price will be cheaper if the blending ratio of the polyester fiber is increased, the heat insulation performance is lowered. According to the experiment (described later), if the content of the meta-type aramid fiber is less than 60% by weight, sufficient heat insulating performance cannot be obtained, and if it exceeds 90% by weight, the heat insulating performance is not substantially changed, but expensive meta type Since only the amount of aramid fiber used is increased, it is not preferable.
In the above embodiment, a heat-resistant felt mainly composed of a meta-type aramid fiber is used as the felt-like heat insulating material. Instead, although heat insulation performance is slightly inferior, a heat-resistant glass having a glass fiber in a felt shape. It is also possible to use felt. Moreover, in the said embodiment, although the nonwoven fabric was used as the jacket which encloses a laminated body, it is also possible to use the film-form raw material made from a plastic instead of a nonwoven fabric.
[0028]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A fireproof coating material 10 as shown in FIG. 1 is produced as a prototype, and is wrapped around the outer periphery of a cable protection tube 18 arranged as shown in FIG. The connection band 26 of FIG. 3 was wound, and the protective cover 30 was further covered as shown in FIG.
As the ceramic fiber blanket 12 of the coating material 10 for fireproof treatment, one having a thickness of 25 mm and a density of 160 kg / m ³ was used. As the felt-like heat insulating material 14, a heat-resistant felt composed of 70% by weight of meta-type aramid fiber and 30% by weight of polyester fiber, having a thickness of 10 mm and a density of 80 kg / m ³ was used. The total weight of the fireproof coating material 10 including the nonwoven fabric 16 and the like was 5.5 kg / m ² and the thickness was about 35 mm. Compared to the case of using a conventional ceramic fiber blanket having a thickness of 50 mm, the thickness is lighter, lighter and more flexible, so that the winding work around the cable protection tube is much easier. The protective cover 30 was a galvanium steel plate having a thickness of 0.3 mm.
The above fireproofing structure was subjected to a fireproof test according to a JIS A 1302 secondary heating curve (fireproof time 30 minutes). The result is shown in FIG. The cable surface temperature after 30 minutes was about 50 ° C. (standard is 60 ° C. or less), and it was confirmed that the cable had sufficient fire resistance.
Next, in order to confirm whether or not the fireproofing structure can be used as it is after a fire, the above fireproofing test is completed, and after returning to room temperature, the above process is again performed as it is. The same fire resistance test was conducted. The result is shown in FIG. This result was almost the same as the result of the first fire test. From this result, it was confirmed that the above fireproof structure can maintain fireproof performance even after a fire.
Next, the thickness of the ceramic fiber blanket 12 and the felt-like heat insulating material 14 (70% by weight of the meta-type aramid fiber and 30% by weight of the polyester fiber) of the coating material 10 for the fireproofing treatment is changed in the above fireproofing structure. The fire resistance (cable surface temperature after 30 minutes) and the ease of winding around the cable protection tube were examined. The results are shown in Table 1.
[0033]
[Table 1]

Next, with the above-described fireproof structure, the thickness of the ceramic fiber blanket 12 of the fireproof coating material 10 is fixed to 25 mm, and the thickness of the felt-like heat insulating material 14 is fixed to 10 mm. The fire resistance and ease of winding around the cable protective tube when the components (the blend ratio of the meta-type aramid fiber and the polyester fiber) were changed were investigated. The results are shown in Table 2.
[0035]
[Table 2]

According to this result, the blending ratio of the meta-type aramid fiber and the polyester fiber is preferably in the range of 60 to 90% by weight of the meta-type aramid fiber (even if it exceeds 90% by weight, fire resistance and ease of winding). Are the same, only the price is increased), and in terms of performance and price, it is more preferably in the range of 70 to 80% by weight.
Next, a fire resistance test was conducted in the case where a heat-resistant glass felt was used as the felt-like heat insulating material 14 of the fire-resistant coating material 10 with the above-mentioned fire-resistant structure. The heat-resistant glass felt used has a thickness of 8 mm and a density of 150 kg / m ² . The test results are shown in FIG. 7 together with other test results. In FIG. 7, the product 2 of the present invention is a case where a heat resistant glass felt is used, and the product 1 of the present invention is a case where a heat resistant felt mainly composed of a meta-type aramid fiber is used (same as the test result of FIG. 5). In the conventional product, only a ceramic fiber blanket having a thickness of 50 mm is used.
According to this test result, when heat-resistant glass felt is used as the felt-like heat insulating material, the heat insulating performance is lower than when heat-resistant felt mainly composed of meta-type aramid fibers is used. Can be maintained at the target temperature of about 60 ° C.
[0039]
As described above, the fireproof coating material according to the present invention is thinner and lighter than the conventional ceramic fiber blanket-only fireproof coating material, and is wound on a long body. Easy to attach. In addition, the fireproof structure according to the present invention using this coating material for fireproof treatment has fireproof performance sufficiently satisfying the JIS standard, and the fireproof performance is not lost even after encountering a fire. Easy maintenance.
[Brief description of the drawings]
FIG. 1 shows an embodiment of a covering material for fireproof treatment of a long body according to the present invention, (A) is a front view, (B) is a side view, and (C) is a CC line of (A). FIG.
2 is a partially cutaway side view, and FIG. 2 (B) is an enlarged cross-sectional view taken along line BB of FIG.
3A and 3B are plan views, and FIG. 3B is an enlarged cross-sectional view taken along line BB in FIG. 3A, showing a connecting band wound around the end face butting portion of the fireproof coating material wound as shown in FIG.
4 is a cross-sectional view showing an embodiment of a fireproofing structure according to the present invention using the fireproofing coating material of FIG. 1. FIG.
FIG. 5 is a graph showing fire resistance performance test results of an example of the fireproof structure according to the present invention.
6 is a graph showing the results of a fire resistance performance test performed again for the fire resistance performance test of FIG. 5; FIG.
FIG. 7 is a graph showing fire resistance performance test results of one example and another example of the fire resistance processing structure according to the present invention, together with the fire resistance performance test result of a conventional example.
[Explanation of symbols]
10: Fireproof coating 12: Ceramic fiber blanket 14: Felt-like heat insulating material 16: Non-woven fabric 18: Cable protective tube 20: Optical cable 22A, 22B: Hook fastener 24A, 24B: Hook fastener 26: Connecting band 28: Glass cloth tape 30: Protective cover 30A, 30B: Half member 32: Flange 34: Screw

Claims (8)

A covering material for fire-resistant treatment of a long body, characterized in that an inorganic fiber-based refractory material and a heat-resistant felt-like heat insulating material are laminated, and the laminate is covered with a cloth-like or film-like covering. The fireproof coating material according to claim 1, wherein the fireproof material is a ceramic fiber blanket, and the heat insulating material is a heat resistant felt mainly composed of polymetaphenylene isophthalamide fiber (hereinafter referred to as meta-type aramid fiber). A covering material for fireproof treatment of a long body characterized by the above. The fireproof coating material according to claim 2, wherein the heat-resistant felt contains 60 to 90% by weight of meta-aramid fiber and polyester fiber. The fireproof treatment covering material according to claim 1, wherein the fireproofing material is a ceramic fiber blanket, and the heat insulating material is a heat resistant glass felt made of glass fiber. The fireproof coating material according to any one of claims 1 to 3, wherein a hook-and-loop fastener is attached to the outer cover so that the state can be maintained when the fireproof coating material is wound around a long body. A covering material for fireproof treatment of a long body characterized by the above. The fireproof treatment covering material according to any one of claims 1 to 5, wherein the outer cover has a position corresponding to both ends in the axial direction of the outer peripheral surface when the fireproof coating material is wound around a long body. Covering material for fireproof treatment of long body characterized by attaching hook-and-loop fastener The coating material for fireproof treatment according to any one of claims 1 to 6 is wrapped around the outer periphery of the long body so that the fireproof material is outside the heat insulating material, and the outside is covered with a protective cover made of steel plate. A fire-resistant structure with a long body. The fireproof treatment structure according to claim 7, wherein the fireproof treatment coating material according to claim 6 is used as the fireproof treatment coating material, and a plurality of the fireproof treatment coating materials are provided in the longitudinal direction of the long body. The surface fasteners on one side of the cloth-like tape span the surface fasteners at both ends in the axial direction of the outer peripheral surface of the adjacent fireproof coating material at the end face butting portion of the fireproof coating material. A long-body fireproof structure characterized in that a connecting band formed by sewing is wound with the hook-and-loop fastener inside.

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