JP2018021624A - Heat insulation structure - Google Patents

Heat insulation structure Download PDF

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JP2018021624A
JP2018021624A JP2016153867A JP2016153867A JP2018021624A JP 2018021624 A JP2018021624 A JP 2018021624A JP 2016153867 A JP2016153867 A JP 2016153867A JP 2016153867 A JP2016153867 A JP 2016153867A JP 2018021624 A JP2018021624 A JP 2018021624A
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precast
precast blocks
heat insulation
blocks
skid
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JP2016153867A
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JP6862123B2 (en
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哲則 池部
Tetsunori Ikebe
哲則 池部
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Krosaki Harima Corp
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Krosaki Harima Corp
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Priority to JP2016153867A priority Critical patent/JP6862123B2/en
Priority to PCT/JP2017/027003 priority patent/WO2018025719A1/en
Priority to TW106125828A priority patent/TWI655403B/en
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00—Thermal insulation in general
    • F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/04—Casings; Linings; Walls; Roofs characterised by the form, e.g. shape of the bricks or blocks used
    • F27D1/06—Composite bricks or blocks, e.g. panels, modules
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00—Thermal insulation in general
    • F16L59/14—Arrangements for the insulation of pipes or pipe systems

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Thermal Insulation (AREA)

Abstract

PROBLEM TO BE SOLVED: To prevent a gap from occurring in expansion tolerance between adjacent precast blocks in use, in a heat insulation structure where a metal coating object is covered by a plurality of precast blocks.SOLUTION: A heat insulation structure is configured such that a plurality of precast blocks A, B, where a porous heat insulation aggregate with CaO 6AlOas a mineral composition is blended, are installed so as to cover a metal coating object 10. Between adjacent precast blocks A, A and between adjacent precast blocks B, B, a fiber C containing an AlOcomponent of 70 mass% or more is installed.SELECTED DRAWING: Figure 1

Description

本発明は、加熱炉などの熱設備において、特に抜熱損失の顕著な部位、例えば、水冷スキッドパイプ、炉殻内壁等の金属製の被覆対象物を被覆して断熱するための断熱構造体に関する。   TECHNICAL FIELD The present invention relates to a heat insulating structure for covering and insulating a heat installation such as a heating furnace by covering a metal coating object such as a water-cooled skid pipe, a furnace shell inner wall, etc., particularly where heat removal loss is remarkable. .

かかる断熱構造体として、特許文献１に、加熱炉のウォーキングビームを構成する水冷スキッドパイプ（スキッド）を複数のプレキャストブロック（分割ブロック）により被覆するものが開示されている。そしてこの特許文献１の断熱構造体では、熱膨張による応力によりプレキャストブロックに亀裂や割れが生じないように、長手方向に隣り合うプレキャストブロック間に膨張代を設け、この膨張代にセラミックファイバー等の膨張吸収材を設置している。   As such a heat insulating structure, Patent Document 1 discloses a structure in which a water-cooled skid pipe (skid) constituting a walking beam of a heating furnace is covered with a plurality of precast blocks (divided blocks). And in the heat insulation structure of this patent document 1, an expansion allowance is provided between the precast blocks adjacent in the longitudinal direction so that cracks and cracks do not occur in the precast block due to stress due to thermal expansion. Expansion absorbent material is installed.

しかし、本発明者らの試験によると、膨張吸収材としてセラミックファイバーを設置した場合、そのセラミックファイバーが最初の使用時の加熱により収縮する結果、隣り合うプレキャストブロック間に隙間が生じて断熱効果が低下する問題があることがわかった。   However, according to the test by the present inventors, when ceramic fiber is installed as an expansion absorber, the ceramic fiber shrinks due to heating during the first use, resulting in a gap between adjacent precast blocks, resulting in a heat insulation effect. It turns out that there is a problem to decline.

特開２０１３−１１２８３２号公報JP 2013-111282 A

本発明が解決しようとする課題は、複数のプレキャストブロックにより金属製の被覆対象物を被覆する断熱構造体において、隣り合うプレキャストブロック間に設けた膨張代に使用時に隙間が生じることを抑制することにある。   The problem to be solved by the present invention is to suppress the occurrence of a gap during use in the expansion allowance provided between adjacent precast blocks in a heat insulating structure that covers a metal coating object with a plurality of precast blocks. It is in.

上記課題を解決するため、本発明者らが隣り合うプレキャストブロック間の膨張代に設置する膨張吸収材の材質とプレキャストブロックの材質との関係に着目し検討を重ねた結果、プレキャストブロックの材質をＣａＯ・６Ａｌ２Ｏ３を鉱物組成とした多孔質な断熱性骨材が配合された不定形耐火物材料（ＣＡ６軽量キャスタブル）としたうえで、膨張吸収材の材質をＡｌ２Ｏ３成分を７０質量％以上含有する繊維（アルミナ繊維）とすることで、最初の使用時の加熱により両者が反応して膨張し、これにより隣り合うプレキャストブロック間に設けた膨張代に使用時に隙間が生じることを抑制できることが判明した。 In order to solve the above-mentioned problems, the present inventors have repeatedly studied by paying attention to the relationship between the material of the expansion absorbent material installed in the expansion allowance between adjacent precast blocks and the material of the precast block. An amorphous refractory material (CA6 lightweight castable) containing a porous heat-insulating aggregate composed of CaO · 6Al 2 O 3 as a mineral composition was used, and the material of the expansion absorbent material was 70 parts of Al 2 O 3. By making the fiber (alumina fiber) contained in mass% or more, both of them react and expand due to heating at the time of first use, and this creates a gap during use in the expansion allowance provided between adjacent precast blocks. It was found that it can be suppressed.

すなわち、本発明の一観点によれば、「ＣａＯ・６Ａｌ２Ｏ３を鉱物組成とした多孔質な断熱性骨材が配合されたプレキャストブロックを、金属製の被覆対象物を被覆するように複数設置している断熱構造体において、隣り合うプレキャストブロック間に、Ａｌ２Ｏ３成分を７０質量％以上含有する繊維を設置していることを特徴とする断熱構造体」が提供される。 That is, according to one aspect of the present invention, “a plurality of precast blocks in which a porous heat insulating aggregate having a mineral composition of CaO.6Al 2 O 3 is mixed so as to cover a metal object to be coated. In the installed heat insulation structure, there is provided a “heat insulation structure characterized in that a fiber containing 70% by mass or more of Al 2 O 3 component is installed between adjacent precast blocks”.

本発明の断熱構造体においては、最初の使用時の加熱によりＣＡ６軽量キャスタブル中のＣａＯ成分と、繊維中のアルミナ成分とが反応してＣＡ２（ＣａＯ・２Ａｌ２Ｏ３）又はＣＡ６（ＣａＯ・６Ａｌ２Ｏ３）を生成することによって膨張する。しかも、前記の反応により生成したＣＡ２及びＣＡ６は、ＣＡ６軽量キャスタブルと同じような膨張収縮の挙動を示す。これらにより、隣り合うプレキャストブロック間に設けた膨張代に使用時に隙間が生じることを抑制することができる。また、膨張代自体は確保されるので、熱膨張による応力によりプレキャストブロックに亀裂や割れが生じることも抑制することができる。 In the heat insulating structure of the present invention, the CaO component in the CA6 lightweight castable reacts with the alumina component in the fiber by heating at the time of first use, thereby causing CA2 (CaO.2Al 2 O 3 ) or CA6 (CaO.6Al). It expands by producing 2 O 3 ). And CA2 and CA6 produced | generated by the said reaction show the behavior of expansion-contraction similar to CA6 lightweight castable. By these, it can suppress that a clearance gap produces at the time of use in the expansion allowance provided between adjacent precast blocks. Moreover, since the expansion allowance itself is ensured, it can also suppress that a crack and a crack arise in a precast block by the stress by thermal expansion.

本発明の断熱構造体を適用した水冷スキッドパイプを示す斜視図である。It is a perspective view which shows the water cooling skid pipe to which the heat insulation structure of this invention is applied. 図１のＩ−Ｉ断面図である。It is II sectional drawing of FIG. 図１のII−II断面図である。It is II-II sectional drawing of FIG. 図１の断熱構造体に使用したプレキャストブロックＡを示す斜視図である。It is a perspective view which shows the precast block A used for the heat insulation structure of FIG. 図１の断熱構造体に使用したプレキャストブロックＢを示す斜視図である。It is a perspective view which shows the precast block B used for the heat insulation structure of FIG.

以下、図面を参照しつつ、本発明の実施形態を説明する。
図１に本発明の一実施形態として本発明の断熱構造体を適用した水冷スキッドパイプを示す。また、図２及び図３にはそれぞれ図１のＩ−Ｉ断面及びII−II断面を示し、 図４及び図５にはそれぞれ図１の断熱構造体に使用したプレキャストブロックＡ及びＢを示している。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a water-cooled skid pipe to which a heat insulating structure of the present invention is applied as an embodiment of the present invention. 2 and 3 show the II cross section and II-II cross section of FIG. 1, respectively, and FIGS. 4 and 5 show the precast blocks A and B used in the heat insulating structure of FIG. 1, respectively. Yes.

水冷スキッドパイプ１０は、鉛直方向に伸びる２本のスキッドポスト１１と水平方向に伸びる１本のスキッドビーム１２とからなり、スキッドポスト１１はプレキャストブロックＡで耐火被覆され、スキッドビーム１２はプレキャストブロックＢで耐火被覆されている。そして、隣り合うプレキャストブロックＡとＡの間、プレキャストブロックＢとＢの間にはＡｌ２Ｏ３成分を７０質量％以上含有する繊維（アルミナ繊維）Ｃが配置されている。 The water-cooled skid pipe 10 is composed of two skid posts 11 extending in the vertical direction and one skid beam 12 extending in the horizontal direction. The skid post 11 is fireproof coated with a precast block A. With fireproof coating. Then, between the adjacent precast blocks A and A, the fiber between the precast blocks B and B containing Al 2 O 3 ingredient 70% by mass or more (alumina fiber) C is arranged.

本実施形態においてプレキャストブロックＡ，Ｂは、いずれも金属板１とプレキャストブロック本体２を一体化したもので、金属板１とプレキャストブロック本体２の一体化には金属スタッド３を使用している（図４及び図５参照）。   In this embodiment, each of the precast blocks A and B is obtained by integrating the metal plate 1 and the precast block main body 2, and the metal stud 3 is used for integrating the metal plate 1 and the precast block main body 2 ( 4 and 5).

プレキャストブロックＡ，Ｂにおいて金属板１は金属製の被覆対象物の外周を被覆可能な形状を有する。具体的には、図４のプレキャストブロックＡの金属板１は被覆対象物である円筒状のスキッドポスト１１（図２参照）を被覆可能な半円状の形状を有し、図５のプレキャストブロックＢの金属板１は被覆対象物である楕円筒状のスキッドビーム１２（図３参照）を被覆可能な部分楕円状の形状を有する。また、プレキャストブロックＡ，Ｂにおいてプレキャストブロック本体２は、ＣａＯ・６Ａｌ２Ｏ３を鉱物組成とした多孔質な断熱性骨材と、結合剤としてアルミナセメントが配合された不定形耐火物材料（ＣＡ６軽量キャスタブル）からなる。このＣＡ６軽量キャスタブルは軽量でかつ熱伝導率が低く、耐スケール溶損性に優れるという特徴を有しており、プレキャストブロックＡ，Ｂの断熱効果を向上することができる。 In the precast blocks A and B, the metal plate 1 has a shape capable of covering the outer periphery of a metal object. Specifically, the metal plate 1 of the precast block A in FIG. 4 has a semicircular shape capable of covering the cylindrical skid post 11 (see FIG. 2), which is an object to be coated, and the precast block in FIG. The metal plate 1 of B has a partially elliptical shape capable of covering an elliptical cylindrical skid beam 12 (see FIG. 3) that is an object to be coated. Further, in the precast blocks A and B, the precast block main body 2 is an indeterminate refractory material (CA6) in which a porous heat insulating aggregate having a mineral composition of CaO · 6Al 2 O 3 and alumina cement as a binder is blended. Lightweight castable). This CA6 lightweight castable is lightweight, has low thermal conductivity, and is excellent in scale erosion resistance, and can improve the heat insulation effect of the precast blocks A and B.

これらプレキャストブロックＡ，Ｂを使用して、図１に示すように水冷スキッドパイプ１０を耐火被覆する。具体的には、水冷スキッドパイプ１０のスキッドポスト１１は図２に示すように周方向に２個のプレキャストブロックＡを使用して耐火被覆する。このとき、金属板１をスキッドポスト１１に溶接するが、この溶接は金属板１の端部１ａにより設けられた隙間（溶接するために設けられた隙間）を利用することで容易かつ確実に実施することができる。溶接後、金属板１の端部１ａにより設けられた隙間にはパッチング材４が充填される。一方、水冷スキッドパイプ１０のスキッドビーム１２は図３に示すように周方向に２個のプレキャストブロックＢを使用して耐火被覆する。このとき、金属板１をスキッドビーム１２に溶接するが、この溶接も金属板１の端部１ａにより設けられた隙間を利用することで容易かつ確実に実施することができ、溶接後、金属板１の端部１ａにより設けられた隙間にはパッチング材４が充填される。なお、スキッドビーム１２の上部となるプレキャストブロックＢ，Ｂ間の間隙部分にはパッチング材４が充填され、鋼材を支持するための金属製のスキッドボタン１３が適宜間隔で設置されている。また、スキッドポスト１１とスキッドビーム１２の接合部分もパッチング材４で構成されている。   Using these precast blocks A and B, the water-cooled skid pipe 10 is fireproof coated as shown in FIG. Specifically, the skid post 11 of the water-cooled skid pipe 10 is fire-resistant coated using two precast blocks A in the circumferential direction as shown in FIG. At this time, the metal plate 1 is welded to the skid post 11, and this welding is easily and surely performed by using a gap provided by the end 1 a of the metal plate 1 (a gap provided for welding). can do. After welding, the gap provided by the end 1a of the metal plate 1 is filled with the patching material 4. On the other hand, the skid beam 12 of the water-cooled skid pipe 10 is fire-resistant coated using two precast blocks B in the circumferential direction as shown in FIG. At this time, the metal plate 1 is welded to the skid beam 12, and this welding can also be easily and reliably performed by utilizing the gap provided by the end 1a of the metal plate 1. The gap provided by the end portion 1a is filled with the patching material 4. Note that the gap between the precast blocks B and B, which is the upper part of the skid beam 12, is filled with the patching material 4, and metal skid buttons 13 for supporting the steel material are installed at appropriate intervals. Further, the joining portion between the skid post 11 and the skid beam 12 is also formed of the patching material 4.

以上の構成において長手方向に隣り合うプレキャストブロックＡとＡの間、プレキャストブロックＢとＢの間には、前述のとおりＡｌ２Ｏ３成分を７０質量％以上含有する繊維（アルミナ繊維）Ｃ（図１中のＣ参照）が設置されている。この繊維Ｃが設置されている部分は、いわゆる膨張代であり、最初の使用時の加熱によりＣＡ６軽量キャスタブル中のＣａＯ成分と、繊維中のアルミナ成分とが反応してＣＡ２（ＣａＯ・２Ａｌ２Ｏ３）又はＣＡ６（ＣａＯ・６Ａｌ２Ｏ３）を生成することによって膨張する。しかも、前記の反応により生成したＣＡ２及びＣＡ６は、ＣＡ６軽量キャスタブルと同じような膨張収縮の挙動を示す。これらにより、隣り合うプレキャストブロック間に設けた膨張代に使用時に隙間が生じることを抑制することができる。また、膨張代自体は確保されるので、熱膨張による応力によりプレキャストブロックに亀裂や割れが生じることも抑制することができる。繊維Ｃの厚みは２ｍｍ以上６ｍｍ以下程度が好ましい。
なお、周方向に隣り合うプレキャストブロックＡとＡの間、プレキャストブロックＢとＢの間にも繊維Ｃを設置してもよい。 In the above configuration, fibers (alumina fibers) C containing 70 mass% or more of Al 2 O 3 component between the precast blocks A and A adjacent in the longitudinal direction and between the precast blocks B and B as described above (FIG. 1) is installed. The portion where the fiber C is installed is a so-called expansion allowance, and the CAO component in the CA6 lightweight castable reacts with the alumina component in the fiber by heating at the time of first use, and the CA2 (CaO.2Al 2 O 3 ) or expansion by producing CA6 (CaO.6Al 2 O 3 ). And CA2 and CA6 produced | generated by the said reaction show the behavior of expansion / contraction similar to CA6 lightweight castable. By these, it can suppress that a clearance gap produces at the time of use in the expansion allowance provided between adjacent precast blocks. Moreover, since the expansion allowance itself is ensured, it can also suppress that a crack and a crack arise in a precast block by the stress by thermal expansion. The thickness of the fiber C is preferably about 2 mm to 6 mm.
In addition, you may install the fiber C between the precast blocks A and A adjacent in the circumferential direction, and between the precast blocks B and B.

また、本実施形態において繊維Ｃは、隣り合うプレキャストブロック間の全ての膨張代に設置したが、プレキャストブロックの実際の熱膨張挙動等を考慮して、一部の膨張代にのみ繊維Ｃを設置し、他の膨張代には通常の目地材を設置することもできる。   Further, in this embodiment, the fibers C are installed in all expansion allowances between adjacent precast blocks. However, considering the actual thermal expansion behavior of the precast blocks, the fibers C are installed only in some expansion allowances. However, a normal joint material can be installed for other expansion allowances.

また、本実施形態においてプレキャストブロックは、金属板１とプレキャストブロック本体２を一体化したものとしたが、単純にプレキャストブロック本体のみからなるものとすることもできる。ただし、本実施形態のように金属板１とプレキャストブロック本体２を一体化したものを使用する場合、金属製の被覆対象物（スキッドポスト１１，スキッドビーム１２）の長手方向に対して直交する断面、すなわち図２，３において、プレキャストブロック本体２の厚みと金属板１の長さの比（プレキャストブロック本体の厚み／金属板の長さ）は０．２以上０．４以下であることが好ましい。この比の数値が大きい（プレキャストブロック本体２の厚みが大きすぎる）と、使用時にプレキャストブロック本体２に亀裂が生じやすくなり耐スポール性が低下する。これは、プレキャストブロック本体２の厚みが大きくなるに従い、プレキャストブロック本体２の内周側と外周側との温度勾配が大きくなるためであると推定される。また、プレキャストブロック２本体の厚みが大きくなるに従い、プレキャストブロック全体の重量が増加するため施工性が低下する。この点からも、前記の比は０．４以下とする必要がある。一方、前記の比が小さい（プレキャストブロック本体２の厚みが小さすぎる）と、強度不足により特に製造時にプレキャストブロック本体２に亀裂が生じやすくなる。なお、「プレキャストブロック本体の厚み」とは、金属製の被覆対象物の長手方向に対して直交する断面において、金属板に直交する方向の厚みをいい、「金属板の長さ」とは、金属製の被覆対象物の長手方向に対して直交する断面において、金属製の被覆対象物の周方向に沿った金属板の長さをいう。   Moreover, in this embodiment, although the precast block integrated the metal plate 1 and the precast block main body 2, it can also consist only of a precast block main body. However, when using what integrated the metal plate 1 and the precast block main body 2 like this embodiment, the cross section orthogonal to the longitudinal direction of metal coating | coated objects (skid post 11, skid beam 12). 2 and 3, the ratio of the thickness of the precast block body 2 to the length of the metal plate 1 (the thickness of the precast block body / the length of the metal plate) is preferably 0.2 or more and 0.4 or less. . If the value of this ratio is large (the thickness of the precast block body 2 is too large), the precast block body 2 is liable to crack during use, and the spall resistance decreases. This is presumably because the temperature gradient between the inner peripheral side and the outer peripheral side of the precast block main body 2 increases as the thickness of the precast block main body 2 increases. Moreover, since the weight of the whole precast block increases as the thickness of the precast block 2 main body increases, workability deteriorates. Also from this point, the ratio needs to be 0.4 or less. On the other hand, if the ratio is small (the thickness of the precast block main body 2 is too small), the precast block main body 2 is likely to be cracked particularly during production due to insufficient strength. In addition, the “thickness of the precast block main body” refers to the thickness in the direction orthogonal to the metal plate in the cross section orthogonal to the longitudinal direction of the metal coating object, and the “length of the metal plate” In the cross section orthogonal to the longitudinal direction of the metal coating object, it refers to the length of the metal plate along the circumferential direction of the metal coating object.

図４と同じ半円筒状の２個のプレキャストブロックの上下間に厚み３ｍｍの繊維を挟み込んだ断熱構造体の試験体（表１の実施例１，２及び比較例１，２）について、１４００℃に加熱後４００℃に冷却する加熱冷却のサイクルを３回繰り返す試験を実施し、試験後にプレキャストブロックと繊維の隙間を測定した。表１では、隙間が１ｍｍ未満の場合を○、隙間が１ｍｍ以上の場合を×で表記した。   About 1400 degreeC about the test body (Examples 1 and 2 of Table 1, and Comparative Examples 1 and 2) of the heat insulation structure which inserted the fiber of thickness 3mm between the upper and lower sides of the two semi-cylindrical precast blocks same as FIG. The test was repeated 3 times, and the heating / cooling cycle of cooling to 400 ° C. was conducted after heating, and the gap between the precast block and the fiber was measured after the test. In Table 1, a case where the gap is less than 1 mm is indicated by ◯, and a case where the gap is 1 mm or more is indicated by ×.

Figure 2018021624
Figure 2018021624

表１に示すように、ＣＡ６軽量キャスタブル（表１では単に「ＣＡ６」と表記した。）からなるプレキャストブロック間にＡｌ２Ｏ３成分を７０質量％以上含有する繊維を設置した実施例１，２では、隙間が１ｍｍ未満と良好であった。 As shown in Table 1, Examples 1 and 2 in which fibers containing 70 mass% or more of Al 2 O 3 component were installed between precast blocks made of CA6 lightweight castable (simply represented as “CA6” in Table 1). Then, the gap was as good as less than 1 mm.

これに対して、ＣＡ６軽量キャスタブルからなるプレキャストブロック間に設置した繊維のＡｌ２Ｏ３成分含有量が３５質量％以上と低い比較例１では、隙間が１ｍｍ以上となった。また、プレキャストブロックの材質としてＣＡ６軽量キャスタブルではなくアルミナ−シリカキャスタブルを使用した比較例２でも隙間が１ｍｍ以上となった。これらより、プレキャストブロックの材質とプレキャストブロック間の膨張代に設置する膨張吸収材としての繊維の材質との組合せが重要であることがわかる。 In contrast, in Comparative Example 1 in which the Al 2 O 3 component content of the fiber installed between the precast blocks made of CA6 lightweight castable was as low as 35% by mass or more, the gap was 1 mm or more. Moreover, the gap became 1 mm or more also in the comparative example 2 using not the CA6 lightweight castable but the alumina-silica castable as the material of the precast block. From these, it can be seen that the combination of the material of the precast block and the material of the fiber as the expansion absorbing material installed at the expansion allowance between the precast blocks is important.

Ａ，Ｂ プレキャストブロック
Ｃ 繊維（アルミナ繊維）
１ 金属板
１ａ 金属板の端部
２ プレキャストブロック
３ 金属スタッド
４ ５ パッチング材
１０ 水冷スキッドパイプ
１１ スキッドポスト
１２ スキッドビーム
１３ スキッドボタン A, B Precast block C fiber (alumina fiber)
DESCRIPTION OF SYMBOLS 1 Metal plate 1a End part of metal plate 2 Precast block 3 Metal stud 4 5 Patching material 10 Water-cooled skid pipe 11 Skid post 12 Skid beam 13 Skid button

Claims (1)

ＣａＯ・６Ａｌ２Ｏ３を鉱物組成とした多孔質な断熱性骨材が配合されたプレキャストブロックを、金属製の被覆対象物を被覆するように複数設置している断熱構造体において、
隣り合うプレキャストブロック間に、Ａｌ２Ｏ３成分を７０質量％以上含有する繊維を設置していることを特徴とする断熱構造体。 In a heat insulating structure in which a plurality of precast blocks in which a porous heat insulating aggregate having a mineral composition of CaO.6Al 2 O 3 is blended are coated so as to cover a metal covering object,
Between adjacent precast blocks, insulating structure, characterized in that installed fiber containing Al 2 O 3 component to 70 wt%.
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