JP6819650B2 - Synthetic coating fireproof structure of steel columns and its construction method - Google Patents
Synthetic coating fireproof structure of steel columns and its construction method Download PDFInfo
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- JP6819650B2 JP6819650B2 JP2018093017A JP2018093017A JP6819650B2 JP 6819650 B2 JP6819650 B2 JP 6819650B2 JP 2018093017 A JP2018093017 A JP 2018093017A JP 2018093017 A JP2018093017 A JP 2018093017A JP 6819650 B2 JP6819650 B2 JP 6819650B2
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- 229910000831 Steel Inorganic materials 0.000 title claims description 104
- 239000010959 steel Substances 0.000 title claims description 104
- 238000000576 coating method Methods 0.000 title claims description 102
- 239000011248 coating agent Substances 0.000 title claims description 101
- 238000010276 construction Methods 0.000 title description 18
- 239000000463 material Substances 0.000 claims description 240
- 239000004568 cement Substances 0.000 claims description 73
- 239000002002 slurry Substances 0.000 claims description 30
- 238000005507 spraying Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 9
- 239000010410 layer Substances 0.000 description 34
- 239000011490 mineral wool Substances 0.000 description 34
- 239000002184 metal Substances 0.000 description 30
- 229910052751 metal Inorganic materials 0.000 description 30
- 238000010438 heat treatment Methods 0.000 description 23
- 210000000988 bone and bone Anatomy 0.000 description 13
- 239000007921 spray Substances 0.000 description 12
- 230000000873 masking effect Effects 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000002131 composite material Substances 0.000 description 6
- 239000000945 filler Substances 0.000 description 6
- 230000009970 fire resistant effect Effects 0.000 description 6
- 230000003014 reinforcing effect Effects 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004079 fireproofing Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000011178 precast concrete Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Description
本発明は、鉄骨柱の耐火構造に関し、耐火性の壁材を耐火被覆の一部に活用する合成被覆耐火構造及びその施工方法に関する。 The present invention relates to a fireproof structure of a steel frame column, and relates to a synthetic coated fireproof structure utilizing a fireproof wall material as a part of the fireproof coating and a construction method thereof.
建築物は、建築基準法及びその関連法令によって、用途、部位に応じて要求耐火時間が定められている。鉄骨造では、鋼材は加熱によって耐力が低下するため、その要求耐火時間で一定の耐力を発揮できるように、吹付けロックウールに代表される耐火被覆を行い、鋼材温度の上昇を抑制する。 For buildings, the required fire resistance time is set according to the purpose and part by the Building Standard Law and related laws and regulations. In a steel structure, the yield strength of the steel material decreases due to heating, so a fireproof coating typified by sprayed rock wool is applied so that the steel material can exhibit a certain yield strength within the required fire resistance time, and the rise in the steel material temperature is suppressed.
既往の耐火構造認定では要求耐火時間ごとに吹付けロックウールの被覆厚さが異なり、例えば、非特許文献１が示すように１時間耐火では２５ｍｍ、非特許文献２が示すように２時間耐火では４５ｍｍとなっている。 In the past fireproof structure certification, the coating thickness of sprayed rock wool differs depending on the required fireproof time. For example, as shown in Non-Patent Document 1, 25 mm for 1-hour fireproof and for 2-hour fireproof as shown in Non-Patent Document 2. It is 45 mm.
半乾式吹付けロックウールは、水とセメントを攪拌装置のあるスラリー槽で混合し、吹付け施工器具で、圧送されたロックウールをノズル先端部で噴霧化されたセメントスラリーと混合しながら均一に吹付けて施工する。 Semi-dry sprayed rock wool mixes water and cement in a slurry tank with a stirrer, and uses a spraying tool to uniformly mix the pumped rock wool with the cement slurry sprayed at the tip of the nozzle. Spray and install.
鉄骨柱の合成被覆耐火構造は、例えば、鉄骨柱と壁が近接し、通常の耐火被覆工事が困難な場合に採用されるもので、一定の耐火性能を有するＡＬＣ（Ａｕｔｏｃｌａｖｅｄ Ｌｉｇｈｔｗｅｉｇｈｔ ａｅｒａｔｅｄ Ｃｏｎｃｒｅｔｅ）板、プレキャストコンクリート板、押出成形セメント板などによる壁が、鉄骨柱の耐火被覆の一部として活用される。壁材と鉄骨柱の間隔が、概ね２００ｍｍ以下で多用され、当該間隙部について、鉄骨柱の側面から壁材に耐火被覆を延長して配設し、その間隙部内への耐火被覆施工を省略するものである。 The synthetic coated fireproof structure of the steel column is adopted, for example, when the steel column and the wall are in close proximity to each other and normal fireproof coating work is difficult. Walls made of precast concrete plates, extruded cement plates, etc. are used as part of the fireproof coating of steel columns. The distance between the wall material and the steel frame column is often 200 mm or less, and the fireproof coating is extended from the side surface of the steel frame column to the wall material for the gap, and the fireproof coating is omitted in the gap. It is a thing.
非特許文献３は、ＡＬＣ板を用いた、ＡＬＣ壁パネル・吹付けロックウール合成被覆鉄骨柱であり、鉄骨柱の一面において、ＡＬＣ板を耐火被覆として活用するものである。鉄骨柱とＡＬＣ板との間隙部は、鉄筋を力骨として鉄骨柱と壁材の間に掛け渡し、次いで、吹き付けロックウールの下地材となるメタルラスを取り付けている。また、必要に応じてロックウールからなる耐火バックアップ材をＡＬＣ板に固定配置している。 Non-Patent Document 3 is an ALC wall panel / sprayed rock wool synthetic coated steel frame column using an ALC plate, and utilizes the ALC plate as a fireproof coating on one surface of the steel frame column. The gap between the steel column and the ALC plate is hung between the steel column and the wall material using a reinforcing bar as a force bone, and then a metal lath as a base material for sprayed rock wool is attached. Further, if necessary, a fireproof backup material made of rock wool is fixedly arranged on the ALC plate.
これらの非特許文献１〜３で示されるような耐火構造は、性能評価機関において、所定の条件に基づいて試験を実施し、性能を確認したうえで国土交通大臣の認定を取得するものである。例えばＡＬＣ板を用いた合成被覆耐火構造柱の耐火認定試験においては、四面加熱炉内に試験体を設置し、柱の長期荷重を載荷したうえで、ＩＳＯ８３４による所定の加熱が行なわれ、構造安全性が検証される。 These fireproof structures as shown in Non-Patent Documents 1 to 3 are tested by a performance evaluation organization based on predetermined conditions, and after confirming the performance, they are certified by the Minister of Land, Infrastructure, Transport and Tourism. .. For example, in the fire resistance certification test of a synthetically coated fireproof structural column using an ALC plate, a test piece is installed in a four-sided heating furnace, a long-term load of the column is loaded, and then predetermined heating is performed by ISO834, resulting in structural safety. Gender is verified.
一方、特許文献１に記載の発明では、鉄骨の表面に取付けられたロックウールブランケットまたは成形板表面に噴霧によりセメントスラリーを吹付け塗布、あるいは注入により含浸させ、ロックウールの耐火性能を向上せしめることが示されている。つまり、耐火被覆表面の耐火性を向上させるために保護層としてセメント層を活用している。 On the other hand, in the invention described in Patent Document 1, the fire resistance performance of rock wool is improved by spraying or injecting cement slurry onto the surface of a rock wool blanket or molded plate attached to the surface of a steel frame. It is shown. That is, a cement layer is used as a protective layer in order to improve the fire resistance of the surface of the fireproof coating.
この発明では、耐火被覆材に巻付け施工容易なロックウールブランケット等を用いて耐火被覆工事を容易にするとともに、ロックウールの耐熱性不足を補う目的でセメントスラリーを注入あるいは噴霧し固化するものであり、吹付けロックウールの代替技術として提案されている。この発明において耐火性能をより一層向上させるためには、一度固化させたセメント層の上にロックウールブランケットを二重、三重に積層させることも提案されている。積層するセメント層は１ｍｍ程度とされている。 In the present invention, a rock wool blanket or the like that can be easily wrapped around a fire-resistant coating material is used to facilitate the fire-resistant coating work, and cement slurry is injected or sprayed to solidify for the purpose of compensating for the lack of heat resistance of rock wool. Yes, it has been proposed as an alternative to sprayed rock wool. In the present invention, in order to further improve the fire resistance performance, it is also proposed to stack rock wool blankets in double or triple layers on the cement layer once solidified. The cement layer to be laminated is said to be about 1 mm.
上記のＡＬＣ板を用いた合成被覆耐火構造柱の試験において、ＡＬＣ板を上下の支点のみで保持した縦張構造とした場合には、加熱時にＡＬＣ板の変形が生じやすく、吹付けロックウールとの間に隙間が生じ、当該部分からの火炎や熱気の流入によって鋼材温度が上昇し、耐力が低下する場合がある。 In the test of the synthetic coated fireproof structure column using the above ALC plate, when the ALC plate is held vertically only by the upper and lower fulcrums, the ALC plate is easily deformed during heating, and the sprayed rock wool is used. A gap may be formed between the two, and the temperature of the steel material may rise due to the inflow of flame or hot air from the portion, and the yield strength may decrease.
図８は、厚さ７５ｍｍのＡＬＣ板５００を縦張にした非特許文献３の１時間耐火仕様に準じた試験体について、鋼材温度６００℃に到達するまで載荷加熱を継続した試験終了後の状態を示す写真である。ＡＬＣ板５００は加熱側に凸に変形し、吹付けロックウール５０２との間に隙間５０４が生じていることがわかる。 FIG. 8 shows a state after the end of the test in which a test piece conforming to the 1-hour fire resistance specification of Non-Patent Document 3 in which an ALC plate 500 having a thickness of 75 mm is vertically stretched is continuously loaded and heated until the steel material temperature reaches 600 ° C. It is a photograph showing. It can be seen that the ALC plate 500 is deformed convexly to the heating side, and a gap 504 is formed between the ALC plate 500 and the sprayed rock wool 502.
この現象の原因は、ＡＬＣ板５００内の鉄筋の熱膨張差に起因すると考えられる。すなわち、ＡＬＣ板５００の内部は表裏の２層配筋になっており、加熱表面側の鉄筋温度と加熱裏面側の鉄筋温度の差によって生じる材長変化の差によって加熱側に凸の反りが生じるものと考えられる。 The cause of this phenomenon is considered to be the difference in thermal expansion of the reinforcing bars in the ALC plate 500. That is, the inside of the ALC plate 500 has a two-layer reinforcement arrangement on the front and back sides, and a convex warp occurs on the heating side due to the difference in the material length change caused by the difference between the reinforcing bar temperature on the heating front side and the reinforcing bar temperature on the heating back side. It is considered to be.
この現象への対処として、非特許文献３では加熱時間が長く変形が大きくなる３時間耐火仕様において、当該部分にロックウールによる耐火バックアップ材を配することが示されているが、ロックウールは温度が７００〜８００℃になると急激に体積収縮してしまい、隙間を長時間塞ぐことは困難であると想定される。 As a countermeasure against this phenomenon, Non-Patent Document 3 indicates that a fireproof backup material made of rock wool is arranged in the relevant portion in the 3-hour fireproof specification in which the heating time is long and the deformation becomes large. However, when the temperature reaches 700 to 800 ° C., the volume shrinks rapidly, and it is assumed that it is difficult to close the gap for a long time.
一方、特許文献１に記載の発明に基づき本願発明者が、密度８０ｋｇ／ｍ３のロックウールボード表面に、水とセメントの重量配合比が標準配合で２：１のセメントスラリーを表層から吹付けたところ内部には含浸せずに流れてしまい、厚さ１ｍｍ程度のセメント層を構成するには、セメント濃度を相当に上げるか、吹付け乾燥工程を何度も繰り返す必要があった。 On the other hand, the present inventor based on the invention described in Patent Document 1, the rock wool board surface density 80 kg / m 3, 2 with water and weight proportion of cement standard formulation: spraying a cement slurry from the surface layer However, it flowed into the inside without impregnation, and in order to form a cement layer having a thickness of about 1 mm, it was necessary to considerably increase the cement concentration or repeat the spray drying process many times.
また、この発明では耐火被覆材の表面の耐火性能向上を目的としており、表層に固化したセメント層を設けるか、あるいは注入により内部にセメントを含浸させるものであり、耐火被覆材の内側に耐火バックアップ材として配置することは示されていない。仮にこの発明を耐火バックアップ材に適用し配置する場合には、あらかじめ固化セメント層が設けられたロックウールを準備するか、別途セメント濃度を高めたスラリーを製造する必要があり大きなコストアップになる。 Further, in the present invention, for the purpose of improving the fire resistance performance of the surface of the fire resistant coating material, a solidified cement layer is provided on the surface layer, or cement is impregnated inside by injection, and the fire resistant backing is provided inside the fire resistant coating material. It is not shown to be placed as a material. If this invention is applied to a refractory backup material and arranged, it is necessary to prepare rock wool provided with a solidified cement layer in advance or to separately produce a slurry having a high cement concentration, which greatly increases the cost.
なお、本願発明者がこの発明を非特許文献３の耐火バックアップ材に適用して試験をしたところ、耐火バックアップ材の耐熱温度向上には寄与するが、合成耐火被覆構造の問題点である壁材の反り変形にともなう壁材と耐火被覆材に発生する隙間そのものを抑制することはできないことが確認された。 When the inventor of the present application applied this invention to the refractory backup material of Non-Patent Document 3 and tested it, it contributed to the improvement of the heat resistant temperature of the refractory backup material, but it was a problem of the synthetic refractory coating structure. It was confirmed that the gap itself between the wall material and the refractory coating material due to the warp deformation of the material cannot be suppressed.
本発明は、上記の課題に鑑みてなされたものであって、通常の半乾式吹付けロックウール工事の材料と機材をそのまま用いて、簡便かつ廉価でありながら耐火性能を向上させることのできる鉄骨柱の合成被覆耐火構造及びその施工方法を提供することを目的とする。 The present invention has been made in view of the above problems, and is a steel frame capable of improving fire resistance performance while being simple and inexpensive by using the materials and equipment of ordinary semi-dry sprayed rock wool construction as they are. An object of the present invention is to provide a synthetically coated fireproof structure for columns and a method for constructing the same.
上記の課題を解決し、目的を達成するために、本発明にかかる鉄骨柱の合成被覆耐火構造は、耐火性の壁材と、前記壁材から離間して配置された鉄骨柱と、前記鉄骨柱の延在方向と平行で、前記壁材に対して固定された耐火バックアップ材と、前記耐火バックアップ材の側面に設けられたセメント層と、セメントを含み、前記鉄骨柱の前面を覆うとともに側面から前記壁材まで延設されている耐火被覆材と、を備え、前記耐火バックアップ材と前記耐火被覆材は前記セメント層によって固定されていることを特徴とする。 In order to solve the above problems and achieve the object, the synthetic coated refractory structure of the steel column according to the present invention includes a fire resistant wall material, a steel column arranged apart from the wall material, and the steel frame. It contains a refractory backup material fixed to the wall material, a cement layer provided on the side surface of the refractory backup material, and cement parallel to the extending direction of the column, and covers the front surface of the steel column and the side surface. It is characterized by comprising a fireproof coating material extending from the wall material to the wall material, and the fireproof backup material and the fireproof coating material are fixed by the cement layer.
前記鉄骨柱に対して支持部材を介して支持され、側面視で前記鉄骨柱との重なる部分を有しながら前記鉄骨柱と前記壁材との隙間を覆う下地網体を備え、前記耐火被覆材は前記下地網体を内包して前記セメント層まで達しているとよい。ここで、下地網体は広義であって、吹付けられる耐火被覆材が通過できる多数の孔が設けられた比較的薄い部材である。 The fireproof coating material is provided with a base net body that is supported by the steel frame column via a support member, has a portion that overlaps with the steel frame column in a side view, and covers a gap between the steel frame column and the wall material. It is preferable that the base net body is included and reaches the cement layer. Here, the base net body is a relatively thin member provided with a large number of holes through which the fireproof coating material to be sprayed can pass, in a broad sense.
前記セメント層は前記壁材にも設けられて該壁材と前記耐火被覆材とを固定するとよい。 The cement layer may also be provided on the wall material to fix the wall material and the fireproof coating material.
前記支持部材は、前記鉄骨柱から前記壁材に向かって延在し、前記下地網体は、前記支持部材に沿って伸長および摺動可能に支持されているとよい。 It is preferable that the support member extends from the steel frame column toward the wall material, and the base net body is stretchably and slidably supported along the support member.
また、本発明にかかる鉄骨柱の合成被覆耐火構造の施工方法は、前記耐火バックアップ材の側面にセメントスラリーを吹付けて前記セメント層を形成するステップと、前記セメントスラリーの表面が湿潤状態で、前記鉄骨柱の側面から前記耐火バックアップ材および前記壁材まで前記耐火被覆材を吹付けるステップと、を備え、前記セメントスラリーを前記耐火被覆材に含浸させることを特徴とする。 Further, the method of constructing the synthetically coated refractory structure of the steel column according to the present invention includes a step of spraying cement slurry on the side surface of the refractory backup material to form the cement layer and a wet state of the surface of the cement slurry. A step of spraying the refractory coating material from the side surface of the steel column to the refractory backup material and the wall material is provided, and the cement slurry is impregnated into the refractory coating material.
本発明にかかる鉄骨柱の合成被覆耐火構造及びその施工方法によれば、耐火バックアップ材の側面にセメント層を設け、該セメント層により耐火バックアップ材と耐火被覆材が強固に固定されて一体化しており、長時間の加熱においても壁材の変形を抑制し、かつ壁材と耐火被覆材が離間しにくくなり、耐火性能が向上する。 According to the synthetic coating fireproof structure of the steel column and the construction method thereof according to the present invention, a cement layer is provided on the side surface of the fireproof backup material, and the fireproof backup material and the fireproof coating material are firmly fixed and integrated by the cement layer. Therefore, deformation of the wall material is suppressed even when heated for a long time, and it becomes difficult for the wall material and the fireproof coating material to separate from each other, so that the fireproof performance is improved.
支持部材は、鉄骨柱から壁材に向かって延在し、下地網体は、支持部材に対して摺動可能に支持され、かつ摺動する方向に対して伸長可能な向きに配設することにより、加熱によって壁材の反り変形が大きくなった場合にも下地網体が摺動及び伸長し、耐火被覆材も追従変形して壁材と鉄骨柱との間に隙間が生じにくい。 The support member extends from the steel frame column toward the wall material, and the base net body is slidably supported with respect to the support member and is arranged in a direction expandable with respect to the sliding direction. As a result, even when the warp deformation of the wall material becomes large due to heating, the base net body slides and stretches, and the refractory coating material also follows and deforms, so that a gap is unlikely to occur between the wall material and the steel frame column.
また、通常の半乾式吹付けロックウール工事の材料と機材をそのまま用いることができ、特殊な材料や工程を必要としない簡便で廉価な構造・施工である。 In addition, the materials and equipment for ordinary semi-dry spray rock wool construction can be used as they are, and the structure and construction are simple and inexpensive without the need for special materials or processes.
以下に、本発明にかかる鉄骨柱の合成被覆耐火構造及びその施工方法の実施の形態を図面に基づいて詳細に説明する。なお、この実施の形態によりこの発明が限定されるものではない。 Hereinafter, embodiments of the synthetically coated fireproof structure of the steel frame column and the construction method thereof according to the present invention will be described in detail with reference to the drawings. The present invention is not limited to this embodiment.
図１及び図２に示すように、第１の実施形態にかかる鉄骨柱の合成被覆耐火構造（以下、単に合成被覆耐火構造という）１０は、耐火性の壁材１２と、鉄骨柱１４が離隔して配置され、間隙部２４を形成している。ここで、鉄骨柱１４において、壁材１２に対向する面を裏面、その反対側を前面、壁材１２に直交する二面を側面と呼ぶ。間隙部２４の両側を間隙側方２４ａ、耐火被覆材２２のうち、間隙側方２４ａを塞いでいる部分を被覆材延長部２２ａと呼ぶ。 As shown in FIGS. 1 and 2, in the synthetic coating fireproof structure (hereinafter, simply referred to as a synthetic coating fireproof structure) 10 of the steel frame column according to the first embodiment, the fireproof wall material 12 and the steel frame column 14 are separated from each other. And are arranged to form a gap 24. Here, in the steel frame column 14, the surface facing the wall material 12 is referred to as a back surface, the opposite side thereof is referred to as a front surface, and the two surfaces orthogonal to the wall material 12 are referred to as side surfaces. Both sides of the gap portion 24 are referred to as a gap side 24a, and a portion of the refractory coating material 22 that closes the gap side 24a is referred to as a coating material extension portion 22a.
被覆材延長部２２ａは、壁材１２に対して柱高さ方向（鉄骨柱１４の延在方向と平行）に連続して配置固定された耐火バックアップ材１６と、耐火被覆下地材となるメタルラス（下地網体）１８と、耐火被覆材２２とで構成されている。 The covering material extension portion 22a includes a fireproof backup material 16 that is continuously arranged and fixed in the column height direction (parallel to the extending direction of the steel frame column 14) with respect to the wall material 12, and a metal lath (a metal lath) that serves as a fireproof coating base material. It is composed of a base net body) 18 and a fireproof coating material 22.
また、耐火バックアップ材１６の表面及び壁材１２の耐火被覆材２２が接合される表面にはセメント層２０が設けられており、耐火被覆材２２と固定されている。 Further, a cement layer 20 is provided on the surface of the fireproof backup material 16 and the surface to which the fireproof coating material 22 of the wall material 12 is joined, and is fixed to the fireproof coating material 22.
さらに、力骨（支持部材）２６は、鉄骨柱１４から壁材１２に向かって延在し、メタルラス１８は、力骨２６に対して摺動可能に支持され、かつ摺動する方向に対して伸長可能な向きに配設することにより、加熱によって壁材１２の反り変形が大きくなった場合にもメタルラス１８が摺動及び伸長し、耐火被覆材も追従変形して壁材１２と鉄骨柱１４との間に隙間が生じにくい。 Further, the force bone (support member) 26 extends from the steel frame column 14 toward the wall material 12, and the metal lath 18 is slidably supported with respect to the force bone 26 and with respect to the sliding direction. By arranging in an extendable direction, the metal lath 18 slides and extends even when the warp deformation of the wall material 12 becomes large due to heating, and the fireproof coating material also follows and deforms to form the wall material 12 and the steel frame column 14. It is difficult for a gap to occur between the two.
壁材１２は、上下の梁にロッキング工法により縦張固定している。壁材１２は、ＡＬＣ板のほか、ＰＣ板、押出成型セメント板、けい酸カルシウム板など、耐火性板材の全てに適用することができる。壁材１２の突合せ部にはシーリング材１２ａ、目地耐火バックアップ材１２ｂ、耐火目地材１２ｃが必要に応じて設けられる。 The wall material 12 is vertically stretched and fixed to the upper and lower beams by a locking method. The wall material 12 can be applied to all refractory board materials such as PC boards, extruded cement boards, calcium silicate boards, etc., in addition to ALC boards. A sealing material 12a, a joint fireproof backup material 12b, and a fireproof joint material 12c are provided at the abutting portion of the wall material 12 as needed.
壁材１２は、加熱時に加熱表面側と加熱裏面側の温度差によって生じる熱膨張の差により加熱側に凸に変形する傾向があり、特にＡＬＣ板の内部の鉄筋１２ｄは厚さ方向に二層配筋になっており、大きく変形する。合成被覆耐火構造１０ではこの凸変形を抑制するとともに、凸変形した場合においても耐火被覆材２２の剥離を防止するもので、以下、施工方法とリンクさせながら説明する。ここでは、鉄骨柱１４の外形５５０ｍｍ×５５０ｍｍで厚さ１６ｍｍの角形鋼管柱とし、壁材１２は、厚さ７５ｍｍ以上、望ましくは厚さ１００ｍｍのＡＬＣ板とし、鉄骨柱１４に対して１００ｍｍ離間して配設されている。鉄骨柱１４との離間距離は５００ｍｍ以下、好ましくは２００ｍｍ以下がよい。 The wall material 12 tends to be deformed convexly to the heating side due to the difference in thermal expansion caused by the temperature difference between the heating front surface side and the heating back surface side during heating. In particular, the reinforcing bar 12d inside the ALC plate has two layers in the thickness direction. It has a reinforcing bar arrangement and is greatly deformed. The synthetic coating fireproof structure 10 suppresses this convex deformation and prevents the fireproof coating material 22 from peeling off even when the convex deformation occurs. Hereinafter, the description will be made while linking with the construction method. Here, a square steel pipe column having an outer diameter of 550 mm × 550 mm and a thickness of 16 mm is used for the steel frame column 14, and the wall material 12 is an ALC plate having a thickness of 75 mm or more, preferably 100 mm in thickness, and is separated from the steel frame column 14 by 100 mm. Are arranged. The distance from the steel column 14 is 500 mm or less, preferably 200 mm or less.
まず、耐火バックアップ材１６を壁材１２の接着面１６ａ（図３のハッチング部参照）に対して無機系耐火ボンドで接着して取り付けて間隙側方２４ａを塞ぐ。耐火バックアップ材１６は厚さ５０ｍｍ、幅１００ｍｍ、密度８０ｋｇ／ｍ３のロックウール保温板である。耐火バックアップ材１６は柱高さ方向に連続して配置し、１００ｍｍ幅の側面が鉄骨柱１４の側面と面一状となるように配置する。耐火バックアップ材１６は鉄骨柱１４とは接合しない。なお、耐火バックアップ材の寸法は、１時間耐火構造であれば、厚さ５０ｍｍ、幅５０ｍｍ以上の寸法であれば、壁材１２の加熱変形が生じても、耐火被覆材２２の端部と壁材１２との一体性が確保できる。 First, the fireproof backup material 16 is attached to the adhesive surface 16a of the wall material 12 (see the hatched portion in FIG. 3) with an inorganic fireproof bond to close the gap side 24a. The fireproof backup material 16 is a rock wool heat insulating plate having a thickness of 50 mm, a width of 100 mm, and a density of 80 kg / m 3 . The fireproof backup material 16 is arranged continuously in the column height direction, and the side surface having a width of 100 mm is arranged so as to be flush with the side surface of the steel frame column 14. The fireproof backup material 16 is not joined to the steel column 14. If the size of the fireproof backup material is a one-hour fireproof structure, the thickness is 50 mm, and the width is 50 mm or more, even if the wall material 12 is deformed by heating, the end portion and the wall of the fireproof coating material 22. The unity with the material 12 can be ensured.
また、耐火バックアップ材１６の寸法と配置の関係については、ロックウール保温板の積層方向を厚さ側とし、積層断面側を壁材１２との接着面とする。これにより、壁材１２の変形時に耐火バックアップ材１６が層剥離することがなくなり、強度が向上し好ましい。 Regarding the relationship between the dimensions and the arrangement of the refractory backup material 16, the stacking direction of the rock wool heat insulating plate is the thickness side, and the laminated cross-sectional side is the adhesive surface with the wall material 12. As a result, the fireproof backup material 16 does not peel off when the wall material 12 is deformed, and the strength is improved, which is preferable.
次に、複数の力骨（支持部材）２６を鉄骨柱１４の側面に対して柱高さ方向に所定間隔（たとえば４５０ｍｍ）で溶接により取り付ける。力骨２６は鉄骨柱１４から壁材１２に向かって延在する向きとし、ほぼ壁材１２の表面まで達する長さにする。力骨２６はメタルラス１８の支持部材であり、鉄筋コンクリート用棒鋼の外径９ｍｍの丸鋼である。なお、この工程は、耐火バックアップ材１６の取付け前に行っていても良い。 Next, the plurality of force bones (support members) 26 are attached by welding to the side surface of the steel frame column 14 at predetermined intervals (for example, 450 mm) in the column height direction. The force bone 26 is oriented so as to extend from the steel frame column 14 toward the wall material 12, and has a length that substantially reaches the surface of the wall material 12. The force bone 26 is a support member for the metal lath 18, and is a round steel having an outer diameter of 9 mm, which is a steel bar for reinforced concrete. In addition, this step may be performed before mounting of the refractory backup material 16.
さらに、メタルラス１８を力骨２６に対してなまし鉄線２８により結束する。メタルラス１８は耐火被覆材２２の吹付けをする耐火被覆下地材であり適度な強度を有する。メタルラス１８は、鉄骨柱１４に対して複数の力骨２６を介して支持され、側面視で鉄骨柱１４との重なり部分を有しながら該鉄骨柱１４と壁材１２との間の間隙側方２４ａを覆う。メタルラス１８は力骨２６に沿って伸長および摺動可能とするため、なまし鉄線２８による結束は過度に強固にする必要はない。また、力骨２６に沿って伸長可能となるように、網目の長菱型が柱高さ方向に縦長となるように配置すると望ましい。メタルラス１８は力骨２６に支持されることから耐火バックアップ材１６及び鉄骨柱１４の側面に対しては力骨２６の外径幅の隙間が確保される。メタルラス１８は複数枚継ぎ足して用いてもよい。 Further, the metal lath 18 is bound to the rib 26 by the annealed iron wire 28. The metal lath 18 is a fireproof coating base material for spraying the fireproof coating material 22, and has an appropriate strength. The metal lath 18 is supported by a plurality of force bones 26 with respect to the steel frame column 14, and has an overlapping portion with the steel frame column 14 in a lateral view, and is lateral to the gap between the steel frame column 14 and the wall material 12. Covers 24a. Since the metal lath 18 can extend and slide along the force bone 26, the binding by the annealed iron wire 28 does not need to be excessively strong. Further, it is desirable to arrange the long rhombus of the mesh so as to be vertically long in the column height direction so that it can be extended along the force bone 26. Since the metal lath 18 is supported by the force bone 26, a gap having an outer diameter width of the force bone 26 is secured with respect to the side surfaces of the refractory backup material 16 and the steel frame column 14. A plurality of metal laths 18 may be added and used.
次いで、セメントスラリー吹付によるセメント層２０の形成に先立ち、図３に示すように、壁材１２において被覆材延長部２２ａの吹付け厚さ分だけ避けた位置にマスキングテープ３０を貼り付けて養生するとよい。被覆材延長部２２ａの吹付け厚さ（仕上げ厚さ）分には、被覆材延長部２２ａと壁材１２との剥離を防止するために次工程でセメントスラリーが塗付されるが、マスキングテープの貼り付けにより不要部分へのセメントスラリーの吹付けが防止されるとともに、被覆材延長部２２ａの吹付け施工厚さも容易に管理できるようになる。 Next, prior to the formation of the cement layer 20 by the cement slurry spraying, as shown in FIG. 3, the masking tape 30 is attached and cured at a position of the wall material 12 avoiding the spraying thickness of the covering material extension portion 22a. Good. Cement slurry is applied to the spray thickness (finishing thickness) of the covering material extension portion 22a in the next step in order to prevent the covering material extension portion 22a and the wall material 12 from peeling off, but masking tape. The cement slurry is prevented from being sprayed on the unnecessary portion, and the spraying thickness of the covering material extension portion 22a can be easily controlled.
次に、セメントスラリーを耐火バックアップ材１６、壁材１２に対して吹付けてセメント層２０を形成する。耐火バックアップ材１６に対しては側面の全面に吹付け、壁材１２に対してはマスキングテープ３０に覆われていない箇所に吹付ける。セメント層２０は耐火バックアップ材１６および壁材１２の表面に設けられ、図３ではドットパターンで示している。 Next, the cement slurry is sprayed onto the refractory backup material 16 and the wall material 12 to form the cement layer 20. The fireproof backup material 16 is sprayed on the entire side surface, and the wall material 12 is sprayed on a portion not covered by the masking tape 30. The cement layer 20 is provided on the surfaces of the refractory backup material 16 and the wall material 12, and is shown by a dot pattern in FIG.
セメントスラリーは水とセメントの重量配合比が標準配合で２：１とし、少なくとも表層に均一に色がつく程度に吹付ければよい。この工程におけるセメントスラリーの吹付けは、次工程で使用される半乾式吹付けロックウールの施工器具を用い、別の器具を準備する必要はない。具体的には、半乾式吹付けロックウールは、ノズル先端部で噴霧化されたセメントスラリーとロックウールを混合しながら吹付けることによって行われるが、この工程では、ロックウールの吹き出しを止めた状態でセメントスラリーのバルブを開けて吹付を行う。 The weight mixture ratio of water and cement of the cement slurry is 2: 1 as a standard composition, and it may be sprayed at least to the extent that the surface layer is uniformly colored. For spraying the cement slurry in this step, the semi-dry sprayed rock wool construction tool used in the next step is used, and it is not necessary to prepare another tool. Specifically, the semi-dry sprayed rock wool is performed by spraying the cement slurry sprayed at the tip of the nozzle while mixing the rock wool, but in this step, the blowing of the rock wool is stopped. Open the valve of the cement slurry and spray it.
次いで、吹付けられたセメントスラリーの表面が湿潤状態である間に、半乾式工法によって鉄骨柱１４の前面、側面および間隙側方２４ａに対してロックウールを吹付け、耐火被覆材２２および被覆材延長部２２ａを形成する。耐火被覆材２２および被覆材延長部２２ａの吹付けは、圧密時に規定の密度（例えば、０．２８ｇ／ｃｍ３）となるように、吹付けたままの状態で、規定値よりも４０％程度厚くしておく。 Next, while the surface of the sprayed cement slurry is in a wet state, rock wool is sprayed on the front surface, side surface and gap side 24a of the steel frame column 14 by a semi-dry method, and the refractory coating material 22 and the coating material are sprayed. The extension portion 22a is formed. The spray of the refractory coating material 22 and the coating material extension portion 22a is about 40% of the specified value in the state of being sprayed so as to have a specified density (for example, 0.28 g / cm 3 ) at the time of consolidation. Keep it thick.
メタルラス１８の部分の吹付厚さは、その表面から、規定の厚さが確保できるように吹付を行っても、鉄骨柱１４の側面から、規定の厚さが確保できるように吹付を行ってもよい。吹付けロックウールは、吹付けにより、メタルラス１８の網目を通過させて、鉄骨柱１４の側面部分に充填するとともに、耐火バックアップ材１６のセメント層２０まで到達させ被覆材延長部２２ａを形成してもよいが、吹付後に一旦治具板により押圧して、その裏面側を高密度化するとより望ましい。メタルラス１８は耐火被覆下地材として被覆材延長部２２ａの中に含まれることになり、被覆材延長部２２ａの強度が向上する。また、メタルラス１８が鉄骨柱１４の側面部で摺動、伸長した場合でも、その裏面に圧密充填された耐火被覆材２２が存置されるため、貫通亀裂を生じない。 The spray thickness of the portion of the metal lath 18 may be sprayed from the surface so that the specified thickness can be secured, or from the side surface of the steel frame column 14 so that the specified thickness can be secured. Good. The sprayed rock wool is sprayed to pass through the mesh of the metal lath 18 to fill the side surface portion of the steel frame column 14 and reach the cement layer 20 of the refractory backup material 16 to form the covering material extension portion 22a. Although it may be preferable, it is more preferable to press the jig plate once after spraying to increase the density of the back surface side thereof. The metal lath 18 is included in the coating material extension portion 22a as a fireproof coating base material, and the strength of the coating material extension portion 22a is improved. Further, even when the metal lath 18 slides and extends on the side surface portion of the steel frame column 14, the fireproof coating material 22 compactly filled on the back surface thereof does not cause a through crack.
また、このように先吹きしたセメントスラリーが湿潤状態である間に吹付けロックウールを施工することにより、セメントスラリーは毛細管現象によって吹付けロックウールに含浸され、耐火被覆材２２と耐火バックアップ材１６の境界部が高密度、高耐熱化する。さらに、セメントスラリーが含浸された状態で押圧することで、さらに高密度化し、セメントの硬化により相互を強固に固定する。壁材１２におけるセメント層２０においても同様に、吹付けロックウールにセメントスラリーが含浸され、耐火被覆材２２は壁材１２と強固に固定される。 Further, by applying the sprayed rock wool while the pre-blown cement slurry is in a wet state, the cement slurry is impregnated with the sprayed rock wool by the capillary phenomenon, and the fireproof coating material 22 and the fireproof backup material 16 are used. The boundary between the two is high density and high heat resistance. Further, by pressing the cement slurry in a state of being impregnated, the density is further increased, and the cement is hardened to firmly fix each other. Similarly, in the cement layer 20 of the wall material 12, the sprayed rock wool is impregnated with the cement slurry, and the fireproof coating material 22 is firmly fixed to the wall material 12.
被覆材延長部２２ａの部分において、押圧により耐火被覆材２２はセメント層２０を介して耐火バックアップ材１６と一層強固に固着されるため、加熱時の壁材１２の変形を抑制することができる。長時間の加熱により、加熱時に壁材１２の変形が生じても、その変形量は小さく抑制される。また、メタルラス１８は力骨２６に対して伸長および摺動可能となっているため、被覆材延長部２２ａは微小クラックを発生しながら延伸して変形に追従するようになり、被覆材延長部２２ａは壁材１２と固着した状態を維持し、熱気が直接侵入可能な開口を生じることがない。 In the portion of the covering material extension portion 22a, the fireproof covering material 22 is more firmly fixed to the fireproof backup material 16 via the cement layer 20 by pressing, so that deformation of the wall material 12 during heating can be suppressed. Even if the wall material 12 is deformed during heating due to long-term heating, the amount of deformation is suppressed to a small extent. Further, since the metal lath 18 is extendable and slidable with respect to the force bone 26, the covering material extension portion 22a stretches while generating minute cracks to follow the deformation, and the covering material extension portion 22a Maintains a state of being fixed to the wall material 12 and does not create an opening through which hot air can directly enter.
この後、耐火被覆材２２の表面の強度を高めるためにセメントスラリーを薄く吹付けてもよい。さらに、耐火被覆材２２及びセメント層２０が十分に固化した後にマスキングテープ３０を取り外し、施工後検査を行う。 After that, the cement slurry may be sprayed thinly in order to increase the strength of the surface of the refractory coating material 22. Further, after the fireproof coating material 22 and the cement layer 20 are sufficiently solidified, the masking tape 30 is removed and an inspection is performed after construction.
このように施工される合成被覆耐火構造１０によれば、被覆材延長部２２ａには耐火被覆下地材としてのメタルラス１８が内包されており、しかも側面視で鉄骨柱１４との重なり部分を有して力骨２６に支持されている。このため、被覆材延長部２２ａは、鉄骨柱１４に対して高強度に固定される。また、耐火バックアップ材１６と耐火被覆材２２がセメント層２０によって強固に固定されて一体化することから、長時間加熱によっても剥離することなく耐火性能が向上する。さらに、被覆材延長部２２ａは壁材１２に対してもセメント層２０によって強固に固定されるため、壁材１２の加熱変形を抑制し、かつ壁材１２と被覆材延長部２２ａが離間しにくくなるため間隙部２４に熱気が侵入することがなく、鉄骨柱１４の温度上昇を抑制することができる。 According to the synthetic coating fireproof structure 10 constructed in this way, the covering material extension portion 22a includes a metal lath 18 as a fireproof coating base material, and has an overlapping portion with the steel frame column 14 in a side view. It is supported by the steel frame 26. Therefore, the covering material extension portion 22a is fixed to the steel frame column 14 with high strength. Further, since the fireproof backup material 16 and the fireproof coating material 22 are firmly fixed and integrated by the cement layer 20, the fireproof performance is improved without peeling even by heating for a long time. Further, since the covering material extension portion 22a is firmly fixed to the wall material 12 by the cement layer 20, the heating deformation of the wall material 12 is suppressed, and the wall material 12 and the covering material extension portion 22a are difficult to separate from each other. Therefore, hot air does not enter the gap 24, and the temperature rise of the steel frame column 14 can be suppressed.
さらにまた、耐火被覆下地材のメタルラス１８は、鉄骨柱１４に支持された力骨２６を介して鉄骨柱１４と離間して配されるとともに、力骨２６に沿って摺動・伸長可能に支持されている。このような構成によれば、壁材１２が加熱側に凸の反り変形をしても、耐火被覆材２２は適正に変形追従することができて壁材１２と剥離が生じにくい。特に、メタルラス１８は網体であって自由な伸長が可能であり、壁材１２が凸変形したとしてもこれに追従することができる。 Furthermore, the metal lath 18 of the fireproof coating base material is arranged apart from the steel frame column 14 via the steel frame 26 supported by the steel frame column 14, and is slidably and extendably supported along the steel frame column 26. Has been done. According to such a configuration, even if the wall material 12 is convexly warped and deformed toward the heating side, the refractory coating material 22 can properly follow the deformation and is unlikely to peel off from the wall material 12. In particular, the metal lath 18 is a net body and can be freely extended, and even if the wall material 12 is convexly deformed, it can follow it.
また、この合成被覆耐火構造１０の施工方法では、一般的な半乾式吹付けロックウール施工で用いる材料や施工器具がそのまま利用でき、専用具や専用材を別途準備する必要がなく、施工手順も大きく変わらないため、手間の増大やコスト上昇が殆どない。 In addition, in the construction method of this synthetic coating fireproof structure 10, the materials and construction equipment used in general semi-dry spray rock wool construction can be used as they are, and there is no need to separately prepare special tools or special materials, and the construction procedure is also complete. Since it does not change much, there is almost no increase in labor or cost.
なお、耐火バックアップ材１６の寸法は、１時間耐火構造であれば、厚さ５０ｍｍ、幅５０ｍｍ以上の寸法であれば、壁材１２の加熱変形が生じても耐火被覆材２２と壁材１２との一体性が確保できることが、本願発明者の実験により確認されている。 If the fireproof backup material 16 has a one-hour fireproof structure, the fireproof coating material 22 and the wall material 12 have a thickness of 50 mm and a width of 50 mm or more even if the wall material 12 is deformed by heating. It has been confirmed by the experiment of the inventor of the present application that the unity of the above can be ensured.
耐火被覆材２２は上記の半乾式吹付けロックウール以外にも耐火性を有するスラリーを用いた吹付け耐火被覆全般にも適用できる。耐火被覆材２２および被覆材延長部２２ａの被覆厚さは、吹付けロックウールの場合、鉄骨柱１４およびメタルラス１８の表面を基準として、１時間耐火構造では２５ｍｍ、２時間耐火構造では４５ｍｍが基準となるが、条件に応じて必要な被覆厚さを適用することができる。 The fireproof coating material 22 can be applied to all spray fireproof coatings using a slurry having fire resistance in addition to the above-mentioned semi-dry sprayed rock wool. In the case of sprayed rock wool, the coating thickness of the fireproof coating material 22 and the covering material extension portion 22a is 25 mm for the 1-hour fireproof structure and 45 mm for the 2-hour fireproof structure based on the surfaces of the steel column 14 and the metal lath 18. However, the required coating thickness can be applied depending on the conditions.
次に、合成被覆耐火構造１０の他の実施形態について説明する。以下、合成被覆耐火構造１０と同じ構成要素については同符号を付してその詳細な説明は省略する。 Next, another embodiment of the synthetic coating fireproof structure 10 will be described. Hereinafter, the same components as those of the synthetic coated fireproof structure 10 are designated by the same reference numerals, and detailed description thereof will be omitted.
図４に示すように、第２の実施形態にかかる合成被覆耐火構造１０ａは、合成被覆耐火構造１０からメタルラス１８及び力骨２６を省略したものである。耐火バックアップ材１６は間隙側方２４ａを閉塞していて、かつ側面にセメント層２０が設けられていれば、被覆材延長部２２ａの下地材としての機能を兼ねることができ、メタルラス１８を省略することもできる。これにより、合成被覆耐火構造１０は一層簡便な構成となり、施工も簡便となる。 As shown in FIG. 4, the synthetic coating fireproof structure 10a according to the second embodiment is obtained by omitting the metal lath 18 and the force bone 26 from the synthetic coating fireproof structure 10. If the refractory backup material 16 closes the gap side 24a and the cement layer 20 is provided on the side surface, the fireproof backup material 16 can also function as a base material for the covering material extension portion 22a, and the metal lath 18 is omitted. You can also do it. As a result, the synthetic coating fireproof structure 10 has a simpler structure and is easier to construct.
メタルラス１８を省略した部分については、被覆材延長部２２ａを高密度化することにより強度を高めるとよい。具体的には、この部分については吹付け時のセメントスラリー量を増加しておくとともに外縁位置を厚めに形成しておきその後に側方から治具板で押圧して規定の被覆厚さに仕上げるとよい。密度の目安としては、被覆材延長部２２ａの部分で０．２８ｇ／ｃｍ３以上とし、耐火被覆材２２におけるそれ以外の部分で０．２０ｇ／ｃｍ３以上とするとよい。なお、以下に説明する合成被覆耐火構造１０ｂ、１０ｃ、１０ｄにおいても同様の施工を行い、メタルラス１８を省略する場合には被覆材延長部２２ａを高密度化して強度を高めるとよい。 For the portion where the metal lath 18 is omitted, it is preferable to increase the strength by increasing the density of the covering material extension portion 22a. Specifically, for this part, the amount of cement slurry at the time of spraying is increased and the outer edge position is formed thicker, and then pressed from the side with a jig plate to finish to the specified coating thickness. It is good. The measure of density, and coating material at the portion of the extension portion 22a 0.28 g / cm 3 or more, or equal to 0.20 g / cm 3 or more in the other portions in the fireproofing material 22. The same construction is performed on the synthetic coating fireproof structures 10b, 10c, and 10d described below, and when the metal lath 18 is omitted, the coating material extension portion 22a may be increased in density to increase its strength.
図５に示すように、第３の実施形態にかかる合成被覆耐火構造１０ｂでは、前述の耐火バックアップ材１６に代えて幅の狭い（例えば５０ｍｍの）耐火バックアップ材３４が用いられており、鉄骨柱１４との間に隙間が確保されている。耐火バックアップ材３４の側面に加えて、鉄骨柱１４に面する面にもセメントスラリーを吹き付けて、セメント層２０を形成するとより望ましい。耐火バックアップ材３４の厚みは耐火バックアップ材１６と同じ５０ｍｍである。メタルラス１８、セメント層２０及び耐火被覆材２２の取り付け及び施工は上記の合成被覆耐火構造１０と同様である。 As shown in FIG. 5, in the synthetic coating fireproof structure 10b according to the third embodiment, a narrow width (for example, 50 mm) fireproof backup material 34 is used instead of the fireproof backup material 16 described above, and the steel frame column. A gap is secured between the 14 and 14. It is more preferable to spray the cement slurry on the surface facing the steel frame column 14 in addition to the side surface of the refractory backup material 34 to form the cement layer 20. The thickness of the refractory backup material 34 is 50 mm, which is the same as that of the refractory backup material 16. The attachment and construction of the metal lath 18, the cement layer 20 and the fireproof coating material 22 are the same as those of the synthetic coating fireproof structure 10 described above.
合成被覆耐火構造１０ｂでは間隙部２４に後述する間隙部充填材３２を充填してもよい。この場合、まず左右両側の耐火バックアップ材３４を壁材１２に対して接着固定しておき、その後、耐火バックアップ材３４と鉄骨柱１４との隙間から間隙部２４に間隙部充填材３２を充填するとよい。 In the synthetic coating fireproof structure 10b, the gap portion 24 may be filled with the gap portion filler 32 described later. In this case, first, the fireproof backup materials 34 on both the left and right sides are adhesively fixed to the wall material 12, and then the gap portion 24 is filled with the gap filling material 32 from the gap between the fireproof backup material 34 and the steel frame column 14. Good.
図６に示すように、第４の実施形態にかかる合成被覆耐火構造１０ｃでは、間隙部２４に間隙部充填材３２が充填されている。この部分は耐火被覆材２２と同じ材質であるが充填箇所が異なることから他の部分と区別して間隙部充填材３２と呼ぶ。 As shown in FIG. 6, in the synthetic coating fireproof structure 10c according to the fourth embodiment, the gap portion 24 is filled with the gap portion filler 32. This portion is made of the same material as the fireproof coating material 22, but the filling portion is different, so that the portion is referred to as a gap filling material 32 to distinguish it from other portions.
この場合、まず、左右いずれか一方の間隙側方２４ａに耐火バックアップ材１６を固定して塞いだ後、間隙部２４内に間隙部充填材３２の吹付け充填処理を行う。このとき開口側における接着面１６ａにはマスキングテープ３０を貼っておく。間隙部２４内に基準容量の間隙部充填材３２を充填した後に、吹付側の面を整え、マスキングテープ３０を剥がして接着面１６ａを露出させた後に耐火バックアップ材１６を接着固定する。その後のメタルラス１８、セメント層２０及び耐火被覆材２２の取り付け及び施工は上記の合成被覆耐火構造１０と同様である。 In this case, first, the fireproof backup material 16 is fixed and closed on either the left or right side of the gap 24a, and then the gap filling material 32 is spray-filled in the gap 24. At this time, the masking tape 30 is attached to the adhesive surface 16a on the opening side. After filling the gap portion 24 with the gap portion filler 32 having a reference capacity, the surface on the spraying side is prepared, the masking tape 30 is peeled off to expose the adhesive surface 16a, and then the fireproof backup material 16 is adhered and fixed. Subsequent attachment and construction of the metal lath 18, the cement layer 20 and the fireproof coating material 22 are the same as those of the synthetic coating fireproof structure 10 described above.
間隙部充填材３２は、その密度は被覆材延長部２２ａよりも低く設定してよく、例えば０．２０ｇ／ｃｍ３以上とするとよい。少なくとも壁材１２側の充填を密にすることで、鉄骨柱１４側に隙間が生じていても耐火性能が向上するが、間隙部２４内を隙間なく充填するのが最も望ましい形態である。鉄骨柱１４の裏面側は基本的には壁材１２で保護されており、間隙部２４内を隙間なく充填されれば熱気が鉄骨柱１４に直接到達することはない。 The density of the gap filling material 32 may be set lower than that of the covering material extension portion 22a, for example, 0.20 g / cm 3 or more. By densely filling at least the wall material 12 side, the fire resistance performance is improved even if there is a gap on the steel frame column 14 side, but it is the most desirable form to fill the gap 24 without a gap. The back surface side of the steel frame column 14 is basically protected by the wall material 12, and if the gap 24 is filled without gaps, hot air does not directly reach the steel frame column 14.
合成被覆耐火構造１０ｃにおいては、メタルラス１８は間隙部充填材３２の充填処理に支障のないように部分施工してもよいし、省略してもよい。間隙部充填材３２と壁材１２との接触する面にはセメント層２０を設けてもよい。セメント層２０が湿潤状態のスラリー状であるときに間隙部充填材３２の吹付けを行うと壁材１２に対して強固に一体化できる。 In the synthetic coating fireproof structure 10c, the metal lath 18 may be partially constructed or omitted so as not to interfere with the filling treatment of the gap filling material 32. A cement layer 20 may be provided on the surface of contact between the gap filling material 32 and the wall material 12. If the gap filling material 32 is sprayed when the cement layer 20 is in a wet slurry state, it can be firmly integrated with the wall material 12.
図７に示すように、第５の実施形態にかかる合成被覆耐火構造１０ｄでは、耐火バックアップ材１６及びメタルラス１８が省略されており、間隙部２４には間隙部充填材（バックアップ材）３２が充填されている。この場合、まず、間隙側方２４ａの一方を仮の閉塞板で塞いでおき、他方から間隙部２４内に間隙部充填材３２を吹付充填した後に、吹付側の面を整える。間隙部２４内の間隙部充填材３２が形成された後に仮の閉塞板を取り除き、被覆材延長部２２ａを含む耐火被覆材２２の吹付け施工をする。このとき被覆材延長部２２ａの部分については上記した高密度化施工を行う。また、少なくとも間隙部充填材（バックアップ材）３２または壁材１２との接触面についてはセメント層２０を設けておく。合成被覆耐火構造１０ｄでは間隙側方２４ａに相当する間隙部充填材３２の側面部が耐火バックアップ材１６の機能を兼ねることができる。 As shown in FIG. 7, in the synthetic coating fireproof structure 10d according to the fifth embodiment, the fireproof backup material 16 and the metal lath 18 are omitted, and the gap portion 24 is filled with the gap portion filler (backup material) 32. Has been done. In this case, first, one of the gap side 24a is closed with a temporary closing plate, and the gap filling material 32 is spray-filled in the gap 24 from the other, and then the surface on the spray side is prepared. After the gap filling material 32 in the gap 24 is formed, the temporary closing plate is removed, and the fireproof coating material 22 including the covering material extension portion 22a is sprayed. At this time, the above-mentioned high-density construction is performed on the portion of the covering material extension portion 22a. Further, a cement layer 20 is provided at least on the contact surface with the gap filling material (backup material) 32 or the wall material 12. In the synthetic coating fireproof structure 10d, the side surface portion of the gap filling material 32 corresponding to the gap side 24a can also serve as the fireproof backup material 16.
合成被覆耐火構造１０ｃ，１０ｄによれば、鉄骨柱１４の裏面が間隙部充填材３２で覆われることになり、耐火性能が一層向上する。また、壁材１２と被覆材延長部２２ａが剥離した場合でも、鉄骨柱１４は間隙部充填材３２で覆われているため、所定の耐火性能を確保することができる。 According to the synthetic coated fireproof structures 10c and 10d, the back surface of the steel frame column 14 is covered with the gap filler 32, and the fireproof performance is further improved. Further, even when the wall material 12 and the covering material extension portion 22a are peeled off, the steel frame column 14 is covered with the gap filling material 32, so that a predetermined fire resistance can be ensured.
合成被覆耐火構造１０ａ〜１０ｄは、上記の合成被覆耐火構造１０と同様に簡便で廉価な構造でありながら高い耐火性を有する。合成被覆耐火構造１０，１０ａ〜１０ｄでは、鉄骨柱１４として角形鋼管柱を例示したが、これに限らず、例えば円形鋼管やＨ型鋼でもよい。 The synthetic coated fireproof structures 10a to 10d have high fire resistance while having a simple and inexpensive structure similar to the synthetic coated fireproof structure 10 described above. In the synthetic coated fireproof structures 10, 10a to 10d, a square steel pipe column is exemplified as the steel frame column 14, but the present invention is not limited to this, and for example, a circular steel pipe or an H-shaped steel may be used.
本発明は、上記した実施形態に限定されるものではなく、本発明の主旨を逸脱しない範囲で自由に変更できることは勿論である。 The present invention is not limited to the above-described embodiment, and it goes without saying that the present invention can be freely modified without departing from the gist of the present invention.
１０，１０ａ，１０ｂ，１０ｃ，１０ｄ 合成被覆耐火構造、 １２ 壁材、 １４ 鉄骨柱、 １６，３４ 耐火バックアップ材、 １６ａ 接着面、 １８ メタルラス（下地網体）、 ２０ セメント層、 ２２ 耐火被覆材、 ２２ａ 被覆材延長部、 ２４ 間隙部、 ２４ａ 間隙側方、 ２６ 力骨（支持部材）、 ２８ なまし鉄線、 ３０ マスキングテープ、 ３２ 間隙部充填材（耐火被覆材、バックアップ材）。 10, 10a, 10b, 10c, 10d Synthetic coating fireproof structure, 12 wall material, 14 steel column, 16,34 fireproof backup material, 16a adhesive surface, 18 metal lath (base net body), 20 cement layer, 22 fireproof coating material, 22a Covering material extension, 24 gaps, 24a gap sides, 26 braces (supporting members), 28 annealed iron wire, 30 masking tape, 32 gap fillers (fireproof coating, backup material).
Claims (5)
前記壁材から離間して配置された鉄骨柱と、
前記鉄骨柱の延在方向と平行で、前記壁材に対して固定された耐火バックアップ材と、
前記耐火バックアップ材の側面に設けられたセメント層と、
セメントを含み、前記鉄骨柱の前面を覆うとともに側面から前記壁材まで延設されている耐火被覆材と、
を備え、
前記耐火バックアップ材と前記耐火被覆材は前記セメント層によって固定されていることを特徴とする鉄骨柱の合成被覆耐火構造。 With fireproof wall material,
Steel columns arranged apart from the wall material,
A refractory backup material fixed to the wall material in parallel with the extending direction of the steel column,
A cement layer provided on the side surface of the refractory backup material and
A refractory coating material containing cement, which covers the front surface of the steel frame column and extends from the side surface to the wall material.
With
A synthetic coating fireproof structure of a steel frame column, wherein the fireproof backup material and the fireproof coating material are fixed by the cement layer.
前記鉄骨柱に対して支持部材を介して支持され、側面視で前記鉄骨柱との重なる部分を有しながら前記鉄骨柱と前記壁材との隙間を覆う下地網体を備え、
前記耐火被覆材は前記下地網体を内包して前記セメント層まで達していることを特徴とする鉄骨柱の合成被覆耐火構造。 In the synthetic coating fireproof structure of the steel frame column according to claim 1,
A base net body that is supported by the steel frame column via a support member and that covers the gap between the steel frame column and the wall material while having a portion that overlaps with the steel frame column in a side view is provided.
The fireproof coating material is a synthetic coating fireproof structure of a steel frame column, characterized in that the base net body is included and reaches the cement layer.
前記セメント層は前記壁材にも設けられて該壁材と前記耐火被覆材とを固定していることを特徴とする鉄骨柱の合成被覆耐火構造。 In the synthetic coating fireproof structure of the steel frame column according to claim 2.
A synthetic coating fireproof structure of a steel frame column, wherein the cement layer is also provided on the wall material and fixes the wall material and the fireproof coating material.
前記支持部材は、前記鉄骨柱から前記壁材に向かって延在し、
前記下地網体は、前記支持部材に沿って伸長および摺動可能に支持されていることを特徴とする鉄骨柱の合成被覆耐火構造。 In the synthetic coating fireproof structure of the steel frame column according to claim 3.
The support member extends from the steel column toward the wall material and extends.
The base net body is a synthetic coating fireproof structure of a steel frame column, characterized in that it is supported so as to be extendable and slidable along the support member.
前記耐火バックアップ材の側面にセメントスラリーを吹付けて前記セメント層を形成するステップと、
前記セメントスラリーの表面が湿潤状態で、前記鉄骨柱の側面から前記耐火バックアップ材および前記壁材まで前記耐火被覆材を吹付けるステップと、
を備え、
前記セメントスラリーを前記耐火被覆材に含浸させることを特徴とする鉄骨柱の合成被覆耐火構造の施工方法。 In the method for constructing a synthetically coated fireproof structure for steel columns according to any one of claims 1 to 4.
A step of spraying cement slurry on the side surface of the refractory backup material to form the cement layer,
A step of spraying the fireproof coating material from the side surface of the steel frame column to the fireproof backup material and the wall material while the surface of the cement slurry is wet.
With
A method for constructing a synthetically coated fireproof structure of a steel frame column, which comprises impregnating the fireproof coating material with the cement slurry.
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| JP2525050Y2 (en) * | 1990-05-31 | 1997-02-05 | 大成建設株式会社 | Synthetic fireproof coating structure |
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| US5356446A (en) * | 1993-07-07 | 1994-10-18 | Smetana David A | Low density insulating and fire-resistant perlite concrete |
| JP3333291B2 (en) * | 1993-12-27 | 2002-10-15 | 株式会社エーアンドエーマテリアル | Steel frame refractory coating structure and steel frame refractory coating method |
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