JP6544297B2 - Composite-coated refractory structure of steel column and its installation method - Google Patents
Composite-coated refractory structure of steel column and its installation method Download PDFInfo
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- JP6544297B2 JP6544297B2 JP2016105020A JP2016105020A JP6544297B2 JP 6544297 B2 JP6544297 B2 JP 6544297B2 JP 2016105020 A JP2016105020 A JP 2016105020A JP 2016105020 A JP2016105020 A JP 2016105020A JP 6544297 B2 JP6544297 B2 JP 6544297B2
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- 229910000831 Steel Inorganic materials 0.000 title claims description 68
- 239000010959 steel Substances 0.000 title claims description 68
- 238000000034 method Methods 0.000 title claims description 16
- 239000002131 composite material Substances 0.000 title claims description 7
- 238000009434 installation Methods 0.000 title 1
- 239000000463 material Substances 0.000 claims description 211
- 239000004568 cement Substances 0.000 claims description 75
- 239000002002 slurry Substances 0.000 claims description 67
- 230000009970 fire resistant effect Effects 0.000 claims description 45
- 239000011490 mineral wool Substances 0.000 claims description 43
- 238000000576 coating method Methods 0.000 claims description 32
- 239000011248 coating agent Substances 0.000 claims description 31
- 238000010438 heat treatment Methods 0.000 claims description 19
- 238000010276 construction Methods 0.000 claims description 16
- 238000005507 spraying Methods 0.000 claims description 14
- 239000007921 spray Substances 0.000 claims description 7
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims 1
- 239000010410 layer Substances 0.000 description 27
- 238000012360 testing method Methods 0.000 description 11
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000003014 reinforcing effect Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000004079 fireproofing Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000013475 authorization Methods 0.000 description 2
- 210000000988 bone and bone Anatomy 0.000 description 2
- 239000004035 construction material Substances 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 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
- 239000004567 concrete Substances 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002557 mineral fiber Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011178 precast concrete Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
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Description
本発明は、鉄骨柱の耐火構造に関し、特に、壁材をその被覆材の一部として活用する鉄骨柱の合成被覆耐火構造およびその施工方法に関するものである。 The present invention relates to a fireproof structure of a steel frame column, and more particularly to a synthetic coated fireproof structure of a steel frame column using a wall material as a part of its covering material and a method of installing the same.
建築物は、建築基準法およびその関連法令によって、規模、部位などに応じて要求耐火時間が定められている。鉄骨造建築物においては、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って鋼材温度の上昇を抑制している。 In the building, the required fire resistance time is determined according to the scale, location, etc. by the Building Standard Act and its related laws and regulations. In steel-framed buildings, steel materials have a reduced resistance to heat, so that fireproof coating represented by shot rock wool is applied to suppress a rise in steel temperature so that a certain resistance can be exhibited in the required fire resistance time. doing.
吹付けロックウールを用いた既往の鉄骨柱の耐火構造認定において、吹付けロックウールの被覆厚さは、例えば１時間耐火では２５ｍｍ（非特許文献１を参照）、２時間耐火では４５ｍｍ（非特許文献２を参照）と、要求耐火時間ごとに被覆厚さが異なっている。なお、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、吹付け施工機械のノズル先端部で、圧送されたロックウールと噴霧化されたセメントスラリーとを混合しながら吹付けて施工される。 In the fireproof structural qualification of steel frame columns using sprayed rock wool, the coated thickness of the sprayed rock wool is, for example, 25 mm for 1 hour fire resistance (see Non-Patent Document 1), 45 mm for 2 hour fire resistance The coating thickness is different for each of the required fire resistance times from the reference 2). The sprayed rock wool is a mixture of water and cement in a slurry tank with a stirrer, and is blown while mixing the pumped rock wool and the atomized cement slurry at the nozzle tip of the spray construction machine. Will be installed.
一方、鉄骨柱の合成被覆耐火構造が知られている（例えば、非特許文献３を参照）。こ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板（高温高圧蒸気養生された軽量気泡コンクリート板）、ＰＣ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材が、鉄骨柱の耐火被覆材の一部として活用される。本構造は、壁材と鉄骨柱の離隔距離が概ね２００ｍｍ以下で多用され、離隔部について、鉄骨柱の側面から壁材に向けて耐火被覆材を延長して配設し、離隔部内の耐火被覆施工を省略するものである。 On the other hand, a synthetic coated refractory structure of steel frame columns is known (see, for example, Non-Patent Document 3). This synthetic coated fire resistant structure is adopted, for example, when a steel frame column and a wall are close to each other and ordinary fire resistant coating work is difficult, and an ALC board (a high temperature high pressure steam cured lightweight foam) having a certain fire performance. Wall materials such as concrete plates), PC plates (precast concrete plates), extrusion cement plates, etc. are used as part of the fireproof covering of steel frame columns. In this structure, the separation distance between the wall material and the steel frame column is often 200 mm or less, and the fireproof covering material is extended from the side of the steel frame column toward the wall material at the separation part. The construction is omitted.
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、壁材のＡＬＣ板を耐火被覆として活用するものである。鉄骨柱と壁材とは間隔が空いており、鉄骨柱から壁材に向けて掛け渡した鉄筋からなる力骨にラス網を取付けて耐火被覆の下地材とし、吹付けロックウールを施工するものである。この構造は、非特許文献１および２と同じく、所定の条件に基づいて実施される性能評価試験により性能を確認し、建築基準法第２条第七号に規定される国土交通大臣の認定を受けたものである。 Non-Patent Document 3 is an ALC wall panel / sprayed rock wool synthetic coated steel frame column using an ALC plate, and on one surface of the steel frame column, the ALC plate of the wall material is used as a fireproof coating. There is a space between the steel frame column and the wall material, and a lath mesh is attached to a force frame consisting of reinforcing bars stretched from the steel frame column to the wall material to make a base material of fireproof coating, and to apply sprayed rock wool. It is. As with Non-Patent Documents 1 and 2, this structure confirms the performance by a performance evaluation test conducted based on predetermined conditions, and is approved by the Minister of Land, Infrastructure, Transport and Tourism as defined in Article 2 Item 7 of the Building Standards Act. It was received.
他方、鉄骨の表面に取付けられたロックウールに、セメントスラリーを吹付け塗布することによってロックウールの耐火性能を向上することが知られている（例えば、特許文献１を参照）。 On the other hand, it is known to improve the fireproof performance of rock wool by applying a cement slurry to the rock wool attached to the surface of a steel frame (see, for example, Patent Document 1).
ところで、合成被覆鉄骨柱に対する現行の耐火構造認定試験においては、４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。壁材がＡＬＣ板の場合を例に説明すると、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、鉄骨柱とＡＬＣ板との間に設けた吹付けロックウールのＡＬＣ板側の端部との間に隙間が生じて、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。 By the way, in the current fireproof structure qualification test for the synthetic coated steel frame column, after installing the test body in the four-sided heating furnace and loading the long-term load of the column, predetermined heating by ISO 834 is performed, and structural safety Is verified. In the case where the wall material is an ALC plate, for example, in the case of a longitudinally stretched structure in which the ALC plate is held only by upper and lower fulcrums, deformation of the ALC plate is likely to occur during heating, and between the steel frame column and the ALC plate There is a case where a gap is formed between the end portion of the sprayed rock wool provided on the ALC plate side and the inflow of flame or hot air from the portion to raise the temperature of the steel material and the yield strength may decrease.
図４は、厚さ７５ｍｍのＡＬＣ板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況写真である。この図に示すように、壁材２０のＡＬＣ板は加熱側（図の左側）に凸に反り変形し、耐火被覆材３０の吹付けロックウールとの間に隙間５１が生じていることがわかる。 Fig. 4 is a photograph after the end of the test where loading heating was continued until the steel temperature reached 600 ° C for the test body according to the 1-hour fireproof specification of Non-Patent Document 3 in which an ALC plate of 75 mm thickness was longitudinally stretched. It is. As shown in this figure, it can be seen that the ALC plate of the wall material 20 is warped and deformed convexly on the heating side (left side in the figure), and a gap 51 is generated between the fireproof covering material 30 and the sprayed rock wool. .
この現象の原因は、ＡＬＣ板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板内には表面側と裏面側に鉄筋が２層配置されており、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変形が生じるものと考えられる。 The cause of this phenomenon is considered to be due to the thermal expansion difference of the reinforcing bars in the ALC plate. That is, in the ALC plate, two layers of reinforcing bars are arranged on the surface side and the back side, and the difference between the change in material temperature caused by the difference between the temperature of the reinforcing bar on the heating surface side and the temperature of the reinforcing bar on the heating back side It is considered that warpage deformation occurs.
この現象への対処方法として、例えば上記の非特許文献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、隙間が生じる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、隙間を塞ぐことが困難となる場合があった。 As a method of coping with this phenomenon, for example, in the above non-patent document 3, it is shown to arrange a fireproof backup material by rock wool in a portion where a gap is generated in a three hour fireproof specification where heating time is long and deformation is large. However, when the temperature reaches 700 to 800 ° C., the volume of the rock wool rapidly shrinks, which may make it difficult to close the gap.
また、上記の特許文献１の方法は、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、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、セメントスラリーを耐火被覆材の内側に配置することは想定されていない。すなわち、半乾式吹付けロックウールは、圧送されたロックウールと噴霧化したセメントスラリーを混合して吹付けて施工するため、通常施工を行なうと、吹付けロックウールと耐火バックアップ材がセメントにより意図せずに固着して、ＡＬＣ板が加熱変形した際には、その変形に追従する耐火バックアップ材によって耐火被覆に想定外の損傷を生じさせる可能性がある。 In the method of Patent Document 1 described above, a cement wool is injected or solidified by using a rock wool blanket or the like which is easily wound around a fireproof covering material and used to compensate for the lack of heat resistance of the rock wool. It is not envisaged to place the cement slurry inside the refractory covering. That is, semi-dry sprayed rock wool is mixed with pressurized rock wool and sprayed cement slurry, and then sprayed and applied. Therefore, when construction is usually performed, the sprayed rock wool and the fireproof backup material are intended by cement. When the ALC plate heats and deforms without being fixed without fireproofing, the fireproof backup material that follows the deformation may cause an unexpected damage to the fireproof coating.
本発明は、上記に鑑みてなされたものであって、壁材の変形に追従して変位する耐火バックアップ材と耐火被覆材との固着による耐火被覆材の破壊を防止することのできる鉄骨柱の合成被覆耐火構造およ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, and it is possible to prevent the destruction of the fireproof covering material due to the adhesion between the fireproof backup material and the fireproof covering material which is displaced following the deformation of the wall material. An object of the present invention is to provide a synthetic coated refractory structure and a method of applying the same.
上記した課題を解決し、目的を達成するために、本発明に係る鉄骨柱の合成被覆耐火構造は、鉄骨柱に近接する壁材と、その壁材と鉄骨柱の対向範囲外の部分にセメントスラリーを含有する吹付け材からなる耐火被覆材を配し、かつ、当該耐火被覆材を、鉄骨柱から壁材まで延長配置した鉄骨柱の合成被覆耐火構造において、耐火被覆材が延長配置される被覆材延長部において耐火被覆材の裏面側に設けられ、高さ方向に連続して壁材に固定されている耐火バックアップ材と、耐火バックアップ材と耐火被覆材との間に設けられるセメントスラリー層とを備え、耐火被覆材のセメントスラリー含有量は表面側よりも裏面側が少なくなっていることを特徴とする。 In order to solve the problems described above and to achieve the object, the composite coated refractory structure of steel frame column according to the present invention comprises a wall material adjacent to the steel frame column, and a cement outside the opposing range of the wall material and the steel frame column. A fire-resistant covering material is extended in a synthetic-coated fire-resistant structure of steel frame columns, which is provided with a fire-resistant covering material comprising a spray material containing a slurry, and the fire-resistant covering material is extended from the steel frame column to the wall material. A fire-resistant backup material provided on the back side of the fire-resistant coating at the coating extension and continuously fixed in the height direction to the wall material, and a cement slurry layer provided between the fire-resistant backup and the fire-resistant coating And the cement slurry content of the fireproof covering material is characterized by being smaller on the back side than on the front side.
また、本発明に係る他の鉄骨柱の合成被覆耐火構造は、上述した発明において、耐火被覆材と耐火バックアップ材の境界部において耐火バックアップ材の表面と離隔独立して配されたラスによる耐火被覆下地材をさらに備え、被覆材延長部におけるセメントスラリー層と耐火被覆材の付着強度は、耐火被覆材を構成する吹付け材同士の付着強度よりも低くされており、耐火被覆材は、加熱時の壁材の変形に追従して変位する耐火バックアップ材と固着することなく摺動可能であることを特徴とする。 Also, synthetic coating refractory structure of another steel column according to the present invention, in the invention described above, the refractory by La scan arranged spaced independently of the surface of the refractory backup material at the boundary of the fireproofing material and refractory backup material The coating base material is further provided, and the adhesion strength between the cement slurry layer and the fireproof covering material at the covering material extension is lower than the adhesion strength between the spraying materials constituting the fireproof covering material, and the fireproof covering material is heated It is characterized in that it can slide without adhering to the fireproof backup material which is displaced following the deformation of the wall material at that time.
また、本発明に係る鉄骨柱の合成被覆耐火構造の施工方法は、上述した鉄骨柱の合成被覆耐火構造を施工する方法であって、上下の梁に壁材を固定してこの壁材に耐火バックアップ材を取り付け、その外側に半乾式吹付けロックウールを施工して耐火被覆材を取り付ける際に、耐火バックアップ材にセメントスラリーを吹付けることによりセメントスラリー層を形成した後、ロックウールを吹付けて耐火被覆材を施工することを特徴とする。 Moreover, the construction method of the composite-coated fireproof structure of steel frame columns according to the present invention is a method of constructing the above-mentioned composite-coated fireproof structure of steel frame columns, fixing a wall material to upper and lower beams and fireproofing this wall material. When forming a cement slurry layer by spraying cement slurry on fireproof backup material when attaching a backup material and installing semi-dry-shot rock wool outside and installing a fireproof covering material, a rock wool is sprayed after the cement slurry layer is formed Fireproof covering material.
また、本発明に係る他の鉄骨柱の合成被覆耐火構造の施工方法は、上述した発明において、耐火バックアップ材の表面と離隔独立して耐火被覆下地材を配し、耐火被覆下地材の上から耐火バックアップ材にセメントスラリーを吹付けてセメントスラリー層を形成した後、ロックウールを吹付けて耐火被覆材を施工することを特徴とする。 In addition, in the above-described invention, the fire-resistant base material is disposed separately from the surface of the fire-resistant backup material separately from the surface of the fire-resistant base material according to the invention. A cement slurry is sprayed on the fireproof backup material to form a cement slurry layer, and then rock wool is sprayed to apply a fireproof covering material.
また、本発明に係る他の鉄骨柱の合成被覆耐火構造の施工方法は、上述した発明において、ロックウールの吹付けを、セメントスラリー層の表面が半乾燥または乾燥状態になった後に行なうことを特徴とする。 Further, in the method for applying the synthetic coated fire-resistant structure of steel frame columns according to the present invention, in the above-mentioned invention, the spraying of rock wool is performed after the surface of the cement slurry layer is in a semi-dry or dry state. It features.
また、本発明に係る他の鉄骨柱の合成被覆耐火構造の施工方法は、上述した発明において、予めセメントスラリー層を表面に形成した耐火バックアップ材を壁材に取り付けることを特徴とする。 Moreover, the construction method of the synthetic-coated fire-resistant structure of the other steel frame column concerning this invention is characterized by attaching the fireproof backup material which formed the cement slurry layer beforehand on the surface in the invention mentioned above to a wall material.
また、本発明に係る他の鉄骨柱の合成被覆耐火構造の施工方法は、上述した発明において、耐火バックアップ材へのロックウールの吹付けに際し、はじめはロックウールと同時に噴霧するセメントスラリー量を少なくし、その後、セメントスラリー量を増加することを特徴とする。 In addition, in the method for applying the synthetic coated fire-resistant structure of steel frame columns according to the present invention, in the above-mentioned invention, when spraying rock wool onto the fire-resistant backup material, the amount of cement slurry sprayed simultaneously with rock wool is small at the beginning. Then, the amount of cement slurry is increased.
本発明によれば、耐火バックアップ材の耐火被覆材側の表面、すなわち加熱側表面において、その全面について、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層を形成して火炎に対する保護層としたため、耐火バックアップ材の加熱側表面の損傷を抑制し、耐火性能を高めることができる。また、耐火被覆材の裏面側（耐火バックアップ材側）のセメントスラリー含有量を少なくしたことによって、壁の変形に追従して変位する耐火バックアップ材と耐火被覆材との固着による破壊を防止し、より安全性を高めることができる。 According to the present invention, the surface of the fireproof backup material on the side of the fireproof coating material, that is, the surface on the heating side, forms a cement slurry layer having a weight ratio of water to cement of 2: 1 in the standard combination on the entire surface. As a protective layer for the above, it is possible to suppress the damage on the heating side surface of the fireproof backup material and to improve the fireproof performance. Also, by reducing the cement slurry content on the back side (fireproof backup material side) of the fireproof coating material, it prevents breakage due to adhesion between the fireproof backup material and the fireproof coating material that are displaced following the deformation of the wall, More safety can be achieved.
また、耐火被覆材と耐火バックアップ材の境界部に、耐火バックアップ材表面と離隔独立した耐火被覆下地材を配し、被覆材延長部において、セメントスラリー層と耐火被覆材の付着強度を低下させることによって、壁の変形に追従して変位する耐火バックアップ材と耐火被覆材との固着による破壊を防止し、より安全性を高めることができる。 In addition, a fireproof covering base material separated from the fireproof backup material surface is disposed at the boundary between the fireproof covering material and the fireproof backup material, and the adhesion strength between the cement slurry layer and the fireproof covering material is reduced in the covering material extension. By this, it is possible to prevent the failure due to the adhesion between the fireproof backup material and the fireproof covering material which is displaced following the deformation of the wall, and to further enhance the safety.
さらに、耐火バックアップ材にセメントスラリーを吹付けて表層にセメントスラリー層を形成した後、ロックウールを吹付けることで耐火被覆材を施工するのに際し、セメントスラリーは、耐火被覆材の施工材料であるため、施工手順もセメントスラリー層を有しない従来構成と大きく変わらない。このため、作業手間の増大やコスト上昇を回避することができる。 Furthermore, after a cement slurry is sprayed on the fireproof backup material to form a cement slurry layer on the surface layer, the cement slurry is a construction material for the fireproof coating material when the fireproof coating material is applied by spraying rock wool. Therefore, the construction procedure is not significantly different from the conventional configuration without the cement slurry layer. For this reason, it is possible to avoid an increase in work time and cost.
以下に、本発明に係る鉄骨柱の合成被覆耐火構造およ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, an embodiment of a synthetic coated fire resistant structure of a steel frame column according to the present invention and a construction method thereof will be described in detail based on the drawings. The present invention is not limited by the embodiment.
［実施の形態１］
まず、本発明の実施の形態１について説明する。
鉄骨柱１０の寸法形状は、特に限定する必要はないが、ここでは□−５５０×５５０×１６（単位：ｍｍ、以下同じ）の角形鋼管柱を例に説明する。壁材２０は、厚さ１００ｍｍのＡＬＣ板（以下、壁材という。）を上下の梁にロッキング工法により縦張固定した場合を例にとり説明するが、ＰＣ板、押出成型セメント板など外壁材のほか、けい酸カルシウム板など、板状の材料の全てに適用することができる。耐火被覆材３０は半乾式吹付けロックウールで代表するが、耐火性を有するスラリーを用いた吹付け耐火被覆材全般にも適用できる。被覆厚さは、１時間耐火構造相当の２５ｍｍとするが、吹付け型の耐火被覆材の全てに対応し、それぞれ必要な被覆厚さを適用することができる。なお、壁材２０と鉄骨柱１０の間隙部５の寸法は特に限定しないが、ここでは、１００ｍｍを例に説明する。
First Embodiment
First, the first embodiment of the present invention will be described.
The dimension and shape of the steel frame column 10 need not be particularly limited, but here, a square steel pipe column of □ -550 × 550 × 16 (unit: mm, hereinafter the same) will be described as an example. The wall material 20 will be described by taking an example in which an ALC plate with a thickness of 100 mm (hereinafter referred to as wall material) is longitudinally fixed to the upper and lower beams by the rocking method. Besides, it can be applied to all plate-like materials such as calcium silicate plates. Although the fireproof coating material 30 is represented by semi-dry-blasted rock wool, it can be applied to all fireproof coating materials using a slurry having fire resistance. The coating thickness is 25 mm, which corresponds to a one-hour refractory structure, but corresponds to all of the spray-type fire-resistant coatings, and the required coating thickness can be applied. In addition, although the dimension of the space part 5 of the wall material 20 and the steel frame pillar 10 is not specifically limited, 100 mm is demonstrated to an example here.
図１は、本実施の形態１の水平断面図である。この図に示すように、鉄骨柱１０と壁材２０は１００ｍｍの間隔で配置され、間隙部５を形成し、その側面部分は、耐火被覆材３０が壁材２０まで延長された被覆材延長部３１を有する。以下、便宜上、鉄骨柱１０の壁材２０に直交する方向の面を側面と定義する。壁材２０は、鉄骨柱１０側の面を屋内面、その裏面を屋外面と定義する。 FIG. 1 is a horizontal sectional view of the first embodiment. As shown in this figure, the steel frame column 10 and the wall material 20 are disposed at a distance of 100 mm to form a gap 5, and the side surface portion thereof is a covering material extension in which the fireproof covering material 30 is extended to the wall material 20 It has 31. Hereinafter, for convenience, the surface in the direction orthogonal to the wall material 20 of the steel frame column 10 is defined as the side surface. In the wall material 20, the surface on the steel frame column 10 side is defined as the indoor surface, and the back surface is defined as the outdoor surface.
耐火バックアップ材４０は、厚さ５０ｍｍ、幅１００ｍｍ、耐熱温度６００℃、密度８０ｋｇ／ｍ３のロックウール保温板（鉱物繊維系断熱材）を、柱高さ方向に連続して、その幅方向の面（以下、側面という。）を鉄骨柱１０の側面と合わせて配置し、壁材２０にその厚さ方向の面（以下、端面という。）を突き付けにしてけい酸ナトリウム系接着剤など、耐火ボンドで接着して取り付けている。鉄骨柱１０とは接合しないが、ここで示した寸法のように、間隙部５の側面を全て閉塞すると、被覆材延長部３１の耐火被覆下地を兼ねることもできる。図２に示すように、耐火バックアップ材４０の幅を大きくしてＬ形状に折り曲げて、壁材２０との接触部を多くして、前記接着剤あるいは機械的手段によって接合すると、耐火バックアップ材４０の復元力によって耐火被覆材３０側に押し付けられ、壁材２０の加熱時の変形時においても、隙間が生じにくくなるのでより望ましい。ここでは、耐火バックアップ材４０の幅は、壁材２０から鉄骨柱１０に達する寸法としているが、要求耐火時間が短い場合には、ＡＬＣ板（壁材２０）の変形が小さいため、鉄骨柱１０に達していなくてもよい。 The fireproof backup material 40 is a rock wool heat insulating board (mineral fiber thermal insulation material) having a thickness of 50 mm, a width of 100 mm, a heat resistance temperature of 600 ° C. and a density of 80 kg / m3 continuously in the column height direction. (Hereafter, it is called the side.) It arranges together with the side of the steel frame column 10, makes the surface in the thickness direction (hereinafter called the end face) to wall material 20, and makes sodium silicate adhesive etc. fireproof bond. It is attached and attached with. Although not joined to the steel frame column 10, if all the side surfaces of the gap 5 are closed as in the dimensions shown here, it can also serve as a fireproof covering base of the covering material extension 31. As shown in FIG. 2, when the width of the fireproof backup material 40 is enlarged and bent into an L shape, the contact portion with the wall material 20 is increased, and the fireproof backup material 40 is joined by the adhesive or mechanical means. It is more desirable because a gap is less likely to be generated even when the wall material 20 is deformed at the time of heating. Here, the width of the fireproof backup material 40 is such that it reaches from the wall material 20 to the steel frame column 10, but when the required fire resistance time is short, the deformation of the ALC plate (wall material 20) is small. It does not have to reach.
耐火被覆材３０の施工に先立ち、セメントと水の重量比を標準配合で１：２としたセメントスラリーを耐火バックアップ材４０の側面全体に吹付け、表層にセメントスラリー層４１を形成する。セメントスラリー層４１の厚さは、全体にむらなく形成すれば、厚さの管理は不要である。セメントスラリーの吹付けは、壁材２０にマスキングを行い、セメントスラリーが付着しないようにするとより望ましい。なお、セメントスラリーのセメントと水の配合比率は上記の配合比率に限るものではなく、望ましくはセメント重量比で２５％〜４０％程度がよく、より望ましくは３０％以上がよい。 Prior to the application of the fireproof covering material 30, a cement slurry having a weight ratio of cement to water of 1: 2 in a standard composition is sprayed on the entire side surface of the fireproof backup material 40 to form a cement slurry layer 41 on the surface. If the thickness of the cement slurry layer 41 is uniformly formed on the whole, the management of the thickness is unnecessary. Spraying a cement slurry is more desirable if the wall material 20 is masked to prevent adhesion of the cement slurry. The blending ratio of cement to water in the cement slurry is not limited to the above blending ratio, and desirably about 25% to 40% in terms of cement weight ratio, and more desirably about 30% or more.
その後、吹付けロックウールを圧送し、噴霧化したセメントスラリーと混合して鉄骨柱１０および耐火バックアップ材４０に吹付け施工することにより耐火被覆材３０を施工する。セメントスラリーの吹付けは、半乾式吹付けロックウールの施工に供する施工器具を、ロックウール圧送を停止した状態で用いればよく、別途施工器具を準備する必要はない。 Thereafter, sprayed rock wool is pressure-fed, mixed with the atomized cement slurry, and sprayed on the steel frame column 10 and the fire-resistant backup material 40 to apply the fire-resistant covering material 30. The cement slurry may be sprayed by using a construction tool to be used for the construction of semi-dry-sprayed rock wool while rock wool pumping is stopped, and there is no need to prepare a separate construction tool.
ここで、耐火バックアップ材４０に形成したセメントスラリー層４１の表面がある程度乾燥（全体が完全硬化していなくてよく、表面の色が白くなった段階でよい）した後に、ロックウールの吹付けを行うとより望ましい。その際に、耐火バックアップ材４０部分への吹付けに際しては、吹付けロックウール表層側でセメントスラリーを増し吹きさせるとよく、より望ましくは、セメントスラリーの噴霧量を減少させて、表層に吹付け、その後セメントスラリーを増量するとよい。この方法により、耐火被覆材３０と耐火バックアップ材４０の界面は殆ど付着力がない状態で構成されるとともに、被覆材延長部３１での耐火被覆材３０の強度は確保できるため、加熱時の壁材２０の変形による耐火バックアップ材４０の摺動も耐火被覆材３０と固着することなく円滑に行なわれ、耐火被覆材３０が耐火バックアップ材４０に追従して破壊することが防止できる。これにより、壁材２０と被覆材延長部３１の間に開口が生じても、間隙部５内部に火炎や熱気が流入することを抑制することができる。 Here, after the surface of the cement slurry layer 41 formed on the fire-resistant backup material 40 has dried to a certain extent (the entire surface may not be completely cured, and the surface may be white at the stage of whitening), the rock wool is sprayed More desirable to do. At that time, when spraying on the fireproof backup material 40 part, it is better to increase the cement slurry on the surface side of the sprayed rock wool, and more preferably, the spraying amount of the cement slurry is reduced to spray the surface Then, it is good to increase the cement slurry. By this method, the interface between the fireproof covering material 30 and the fireproof backup material 40 is configured in a state where there is almost no adhesion, and the strength of the fireproof covering material 30 at the covering material extension 31 can be secured. The sliding of the fireproof backup material 40 due to the deformation of the material 20 is also smoothly performed without adhering to the fireproof covering material 30, and the fireproof covering material 30 can be prevented from following the fireproof backup material 40 and being destroyed. Thereby, even if an opening is generated between the wall material 20 and the covering material extension part 31, it is possible to suppress the flow of the flame or the hot air into the inside of the gap part 5.
［実施の形態２］
次に、本発明の実施の形態２について、耐火被覆下地材３２を耐火被覆材３０と耐火バックアップ材４０の境界部に配した形態を例にとり説明する。以下では、上記の実施の形態１と同じ部分は説明を省略する。
Second Embodiment
Next, a second embodiment of the present invention will be described by taking the form in which the fireproof covering base material 32 is disposed at the boundary between the fireproof covering material 30 and the fireproof backup material 40 as an example. In the following, the same parts as those of the first embodiment described above will not be described.
図３は、本実施の形態２の水平断面図である。この図に示すように、耐火被覆下地材３２にはラスを用いており、ラスは、鉄骨柱１０に高さ方向で４５０ｍｍ程度の間隔に配置された、外径９ｍｍの丸鋼からなる力骨３３に番線等で結束して配置する。その配置位置は、力骨３３の外側において、耐火バックアップ材４０とは接することなく独立して配する。 FIG. 3 is a horizontal sectional view of the second embodiment. As shown in this figure, a lath is used for the fireproof covering base material 32, and the lath is a force steel made of round steel with an outer diameter of 9 mm, which is arranged at intervals of about 450 mm in the height direction on the steel frame column 10. Arrange by bundling with 33 and the like. The arrangement position is independently arranged on the outside of the force bone 33 without contacting the fireproof backup material 40.
耐火被覆材３０の施工に先立ち、セメントと水の重量比を標準配合で１：２としたセメントスラリーを、少なくとも耐火バックアップ材４０の側面全体に、ラスからなる耐火被覆下地材３２上から吹付け、セメントスラリー層４１を表層に形成する。その後、吹付けロックウールを圧送し、噴霧化したセメントスラリーと混合して鉄骨柱１０および耐火被覆下地材３２に吹付け施工することにより耐火被覆材３０を施工する。 Prior to the application of the fire-resistant covering material 30, a cement slurry in which the weight ratio of cement to water is 1: 2 in a standard composition is sprayed onto the fire-resistant covering backing material 32 consisting of lass at least over the entire side surface of the fireproof backup material 40. , The cement slurry layer 41 is formed in the surface layer. Thereafter, the sprayed rock wool is pressure-fed, mixed with the atomized cement slurry, and sprayed on the steel frame columns 10 and the fire-resistant base material 32 to apply the fire-resistant covering material 30.
セメントスラリー層４１の厚さは、全体にむらなく形成すれば、厚さの管理は不要であることを、本発明者は載荷加熱試験で確認済みである。セメントスラリーの吹付けは、壁材２０にマスキングを行い、セメントスラリーが付着しないようにするとより望ましい。 The present inventors have confirmed in the load heating test that the thickness of the cement slurry layer 41 is not required to be managed if it is uniformly formed on the whole. Spraying a cement slurry is more desirable if the wall material 20 is masked to prevent adhesion of the cement slurry.
参考として、図５に上記の載荷加熱試験結果を示す。この図は、被覆材延長部３１側（壁材２０側）の鉄骨柱１０角部の鋼材温度の推移を、従来仕様（比較例）と本実施の形態（実施例）とで比較したものである。比較例は、図４の試験体である。比較例、実施例ともに、加熱により壁材２０が変形し、被覆材延長部３１との隙間５１（図４を参照）が生じ、時間の経過とともに拡大した。それにともない、耐火バックアップ材４０の側面は徐々に露出した。比較例では、耐火バックアップ材４０が熱によってほぼ完全に損耗して内部に熱気が直接流入し、１２０分到達前に鋼材温度が６００℃に達した。一方で、実施例では損耗がなく、内部に直接熱気が流入しなかったため、鋼材温度は４００℃程度に抑えられている。 As a reference, FIG. 5 shows the results of the above-described load heating test. This figure is a comparison of the transition of the steel material temperature of 10 corners of the steel frame column on the side of the covering material extension 31 (the side of the wall material 20) in the conventional specification (comparative example) and this embodiment (example) is there. A comparative example is the test body of FIG. In both the comparative example and the example, the wall material 20 was deformed by heating, and a gap 51 (see FIG. 4) with the covering material extension 31 was generated, and expanded with time. Along with this, the side surface of the fireproof backup material 40 was gradually exposed. In the comparative example, the fireproof backup material 40 was almost completely worn away by heat, and hot air flowed into the inside directly, and the steel temperature reached 600 ° C. before reaching 120 minutes. On the other hand, in the example, there was no wear and tear and the hot air did not flow directly into the inside, so the steel material temperature is suppressed to about 400 ° C.
この形態によれば、被覆材延長部３１での耐火被覆材３０は、耐火被覆下地材３２により補強されて強度が確保できるとともに、耐火バックアップ材４０と固着することがないため、加熱時の壁材２０の変形に追従して耐火被覆材３０が損傷することなく、耐火バックアップ材４０の摺動が円滑に行なわれ、壁材２０と被覆材延長部３１の間に開口が生じても、間隙部５内部に火炎や熱気が流入することを抑制することができる。 According to this embodiment, the fireproof covering material 30 in the covering material extension part 31 can be reinforced by the fireproof covering base material 32 to ensure the strength, and since it does not adhere to the fireproof backup material 40, the wall at the time of heating Even if the fire-resistant backup material 40 slides smoothly without damage to the fire-resistant covering material 30 following the deformation of the material 20 and an opening occurs between the wall material 20 and the covering material extension portion 31, the gap It is possible to suppress the inflow of flame and hot air into the inside of the part 5.
［実施の形態３］
次に、本発明の実施の形態３について、耐火バックアップ材４０の表面に予めセメントスラリー層４１を形成した形態の場合を例にとり説明する。セメントスラリー層４１の形成方法は、表面に噴霧、塗布、含浸など、いずれの方法でもよい。
Third Embodiment
Next, the case where the cement slurry layer 41 is formed in advance on the surface of the fireproof backup material 40 will be described as an example of the third embodiment of the present invention. The cement slurry layer 41 may be formed by spraying, coating, impregnating, etc. on the surface.
ここで製作した耐火バックアップ材４０を用いると、上記の実施の形態１および２において、壁材２０への取付後にセメントスラリー層４１の施工を省略することができるが、上記の実施の形態１および２に示した施工方法をそのまま踏襲して、表面にセメントスラリー層４１を増吹きすると、より強固なセメントスラリー層４１を構築することができる。 When the fire-resistant backup material 40 manufactured here is used, the application of the cement slurry layer 41 can be omitted after the attachment to the wall material 20 in Embodiments 1 and 2 described above. If the construction method shown in 2 is followed as it is and the cement slurry layer 41 is blown on the surface, a stronger cement slurry layer 41 can be constructed.
以上説明したように、本発明によれば、耐火バックアップ材の耐火被覆材側の表面、すなわち加熱側表面において、その全面について、セメントと水の重量配合比が標準配合で１：２のセメントスラリー層を形成して火炎に対する保護層としたため、耐火バックアップ材の加熱側表面の損傷を抑制し、耐火性能を高めることができる。また、耐火被覆材の裏面側（耐火バックアップ材側）のセメントスラリー含有量を表面側よりも少なくしたことによって、壁の変形に追従して変位する耐火バックアップ材と耐火被覆材との固着による損傷を防止し、より安全性を高めることができる。 As described above, according to the present invention, the weight ratio of cement to water is 1: 2 as a standard composition on the entire surface of the fireproof backup material on the fireproof covering material side, that is, the heating side surface. Since the layer is formed to be a protective layer against fire, damage to the heating side surface of the fireproof backup material can be suppressed, and the fireproof performance can be enhanced. In addition, damage due to adhesion between the fireproof backup material and the fireproof covering material which is displaced following the deformation of the wall by making the cement slurry content on the back side (fireproof backup material side) of the fireproof covering material smaller than that on the front side. Can be prevented and more secure.
また、耐火被覆材と耐火バックアップ材の境界部に、耐火バックアップ材表面と離隔独立した耐火被覆下地材を配し、被覆材延長部において、セメントスラリー層と耐火被覆材の付着強度を低下させることによって、壁の変形に追従して変位する耐火バックアップ材と耐火被覆材との固着による破壊を防止し、より安全性を高めることができる。 In addition, a fireproof covering base material separated from the fireproof backup material surface is disposed at the boundary between the fireproof covering material and the fireproof backup material, and the adhesion strength between the cement slurry layer and the fireproof covering material is reduced in the covering material extension. By this, it is possible to prevent the failure due to the adhesion between the fireproof backup material and the fireproof covering material which is displaced following the deformation of the wall, and to further enhance the safety.
さらに、耐火バックアップ材にセメントスラリーを吹付けてセメントスラリー層を形成した後、ここにロックウールを吹付けることで耐火被覆材を施工することができ、耐火被覆材の施工材料と異なる材料を別途準備する必要がなく、施工手順もセメントスラリー層を有しない構成と大きく変わらないため、作業手間の増大やコスト上昇を回避することができる。 Furthermore, after a cement slurry is sprayed onto the fireproof backup material to form a cement slurry layer, a fireproof covering material can be applied by spraying rock wool here, and a material different from the construction material for the fireproof covering material is separately provided. Since it is not necessary to prepare and the construction procedure is not significantly different from the construction without the cement slurry layer, it is possible to avoid an increase in work time and cost.
５ 間隙部
１０ 鉄骨柱
２０ 壁材
３０ 耐火被覆材
３１ 被覆材延長部
３２ 耐火被覆下地材
３３ 力骨
４０ 耐火バックアップ材
４１ セメントスラリー層
Reference Signs List 5 gap part 10 steel frame column 20 wall material 30 fireproof covering material 31 covering material extension part 32 fireproof covering base material 33 strength bone 40 fireproof backup material 41 cement slurry layer
Claims (7)
耐火被覆材が延長配置される被覆材延長部において耐火被覆材の裏面側に設けられ、高さ方向に連続して壁材に固定されている耐火バックアップ材と、
耐火バックアップ材と耐火被覆材との間に設けられるセメントスラリー層とを備え、
耐火被覆材のセメントスラリー含有量は表面側よりも裏面側が少なくなっていることを特徴とする鉄骨柱の合成被覆耐火構造。 A fire-resistant covering material consisting of a wall material adjacent to a steel frame column and a spray material containing a cement slurry is disposed in a part outside the opposing range of the wall material and the steel frame column, and In the case of synthetically coated fireproof construction of steel frame columns extended to the wall material,
A fire-resistant backup material provided on the back side of the fire-resistant covering at a covering extension where the fire-resistant covering is extended and continuously fixed in the height direction to the wall material,
And a cement slurry layer provided between the fireproof backup material and the fireproof coating material;
What is claimed is: 1. A composite-coated fire-resistant structure for steel frame columns, wherein the cement slurry content of the fire-resistant covering material is lower on the back side than on the front side.
上下の梁に壁材を固定してこの壁材に耐火バックアップ材を取り付け、その外側に半乾式吹付けロックウールを施工して耐火被覆材を取り付ける際に、耐火バックアップ材にセメントスラリーを吹付けることによりセメントスラリー層を形成した後、ロックウールを吹付けて耐火被覆材を施工す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。 It is a method of constructing the synthetic covering fireproof structure of the steel frame column according to claim 1 or 2,
Fix the wall material to the upper and lower beams and attach the fireproof backup material to this wall material, and spray cement slurry on the fireproof backup material when installing the semi-dry shot rock wool on the outside and attaching the fireproof covering material Forming a cement slurry layer, and then spraying rock wool to apply a fire-resistant covering material.
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