JP2021025346A - Joint structure of steel member - Google Patents
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- JP2021025346A JP2021025346A JP2019145189A JP2019145189A JP2021025346A JP 2021025346 A JP2021025346 A JP 2021025346A JP 2019145189 A JP2019145189 A JP 2019145189A JP 2019145189 A JP2019145189 A JP 2019145189A JP 2021025346 A JP2021025346 A JP 2021025346A
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- 239000010959 steel Substances 0.000 title claims abstract description 45
- 239000000463 material Substances 0.000 claims abstract description 54
- 238000012546 transfer Methods 0.000 claims abstract description 7
- 239000000446 fuel Substances 0.000 claims description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 230000000903 blocking effect Effects 0.000 claims description 10
- 238000002425 crystallisation Methods 0.000 claims description 4
- 230000008025 crystallization Effects 0.000 claims description 4
- 239000004567 concrete Substances 0.000 abstract description 29
- 239000010410 layer Substances 0.000 description 66
- 239000002023 wood Substances 0.000 description 37
- 238000002485 combustion reaction Methods 0.000 description 9
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- 239000004568 cement Substances 0.000 description 6
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- 229910052602 gypsum Inorganic materials 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000011162 core material Substances 0.000 description 3
- 238000003763 carbonization Methods 0.000 description 2
- 230000001934 delay Effects 0.000 description 2
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- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 229920005549 butyl rubber Polymers 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
- 239000004918 carbon fiber reinforced polymer Substances 0.000 description 1
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- 239000011152 fibreglass Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000011491 glass wool Substances 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000002648 laminated material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- Building Environments (AREA)
- Joining Of Building Structures In Genera (AREA)
Abstract
Description
本発明は、鉄骨部材の接合構造に関する。 The present invention relates to a joint structure of steel frame members.
特許文献１には、鋼製の構造部材と木製の構造部材とを接合した構造部材の接合構造に関する技術が開示されている。この先行技術の接合構造は、鋼製の第１構造部材と、心材及び燃え止まり層を備えた第２構造部材と、第１構造部材と第２構造部材とを接合し第１構造部材から心材への熱の伝達を抑制する遮蔽部材と、を有している。 Patent Document 1 discloses a technique relating to a joint structure of a structural member in which a steel structural member and a wooden structural member are joined. In this prior art joining structure, a first structural member made of steel, a second structural member provided with a core material and a burn-off layer, and a first structural member and a second structural member are joined to form a core material from the first structural member. It has a shielding member that suppresses heat transfer to.
しかし、木柱の上側柱と下側柱との間のコンクリートで構成された仕口部に鉄骨梁が接合されている場合、仕口部のコンクリートは熱容量が大きいため火災時に蓄熱され、火災終了後に蓄熱したコンクリート仕口部からの伝熱によって上下の木柱が高温に加熱される虞がある。 However, when a steel beam is joined to the joint made of concrete between the upper and lower columns of the wooden column, the concrete at the joint has a large heat capacity, so heat is stored in the event of a fire and the fire ends. There is a risk that the upper and lower wooden pillars will be heated to a high temperature due to heat transfer from the concrete joint that stores heat later.
本発明は、上記事実に鑑み、構造材におけるコンクリート等の不燃材で構成された仕口部の火災時の温度上昇を遅延させることが目的である。 In view of the above facts, an object of the present invention is to delay the temperature rise of the joint portion of the structural material made of a non-combustible material such as concrete at the time of fire.
第一態様は、可燃性の構造材と、前記構造材に設けられ、前記構造材よりも熱容量が大きい不燃材又は結晶水及び自由水の少なくとも一方を含む不燃材で構成された仕口部と、前記仕口部に設けられた接合部材に接合された鉄骨部材と、前記仕口部の前記不燃材が露出した露出面に設けられ、前記仕口部への熱伝達を遅延させる遅延部材と、を備えた鉄骨部材の接合構造である。 The first aspect is a joint portion composed of a flammable structural material and a non-combustible material provided on the structural material and having a heat capacity larger than that of the structural material or containing at least one of water of crystallization and free water. , A steel frame member joined to the joining member provided in the joint portion, and a delay member provided in the exposed surface of the joint portion where the incombustible material is exposed to delay heat transfer to the joint portion. It is a joint structure of a steel frame member provided with.
第一態様の鉄骨部材の接合構造によれば、仕口部の不燃材が露出した露出面に設けられた遅延部材によって、火災時の仕口部への熱伝達が遅延し、その結果、仕口部の温度上昇が遅延する。したがって、火災時に仕口部に蓄熱される蓄熱量が抑制されるので、火災終了後の可燃性の構造部材の温度上昇が抑制される。 According to the joint structure of the steel frame member of the first aspect, the delay member provided on the exposed surface where the non-combustible material of the joint portion is exposed delays the heat transfer to the joint portion in the event of a fire, and as a result, the finish The temperature rise in the mouth is delayed. Therefore, since the amount of heat stored in the joint portion during a fire is suppressed, the temperature rise of the flammable structural member after the end of the fire is suppressed.
第二態様は、前記遅延部材は、木質のパネル材である、第一態様の鉄骨部材の接合構造である。 The second aspect is the joint structure of the steel frame members of the first aspect, wherein the delay member is a wooden panel material.
第二態様の鉄骨部材の接合構造によれば、仕口部の不燃材が露出した露出面に接合された木質のパネルが、火災時に炭化して炭化層となる。そして、炭化層によって仕口部へ浸入する火災熱が低減されることで、仕口部の温度上昇が効果的に遅延する。 According to the joint structure of the steel frame member of the second aspect, the wood panel joined to the exposed surface where the non-combustible material at the joint is exposed is carbonized to form a carbonized layer in the event of a fire. Then, the carbonized layer reduces the heat of fire that enters the joint, so that the temperature rise of the joint is effectively delayed.
第三態様は、前記構造材は、荷重を支持する木質の荷重支持部と、前記荷重支持部の周囲に設けられた燃止層と、前記燃止層の周囲に設けられた木質の燃代層と、を有し、前記仕口部に設けられた前記接合部材は、前記荷重支持部に接合されている、第一態様又は第二態様の鉄骨部材の接合構造である。 In the third aspect, the structural material includes a wooden load supporting portion that supports the load, a fuel blocking layer provided around the load supporting portion, and a woody fuel allowance provided around the burning stopping layer. The joining member having a layer and provided at the joint portion is a joining structure of a steel frame member of the first aspect or the second aspect, which is joined to the load supporting portion.
第三態様の鉄骨部材の接合構造によれば、構造材の可燃部は、荷重を支持する木質の荷重支持部と、荷重支持部の周囲に設けられた燃止層と、燃止層の周囲に設けられた木質の燃代層と、を有している。よって、火災時に燃代層が炭化することで、燃止層及び荷重支持部へ浸入する火災熱が低減される。更に、燃止層によって燃焼が阻止される。このように、火災時には、荷重支持部の燃焼が防止又は抑制されるので、耐火性能を有する木質の構造材として使用することが可能となる。 According to the joint structure of the steel frame member of the third aspect, the combustible portion of the structural material includes a wooden load support portion that supports the load, a fuel stop layer provided around the load support portion, and the periphery of the fuel stop layer. It has a wood-based fuel allowance layer provided in. Therefore, the carbonization of the fuel allowance layer during a fire reduces the heat of fire that enters the fuel stop layer and the load support portion. In addition, the combustion arrest layer prevents combustion. As described above, in the event of a fire, combustion of the load supporting portion is prevented or suppressed, so that it can be used as a wooden structural material having fire resistance.
本発明によれば、構造材における不燃材で構成された仕口部の火災時の温度上昇を遅延させることができる。 According to the present invention, it is possible to delay the temperature rise of the joint portion made of the non-combustible material in the structural material at the time of fire.
＜実施形態＞
本発明の一実施形態の鉄骨部材の接合構造について説明する。なお、水平方向の直交する二方向をＸ方向及びＹ方向とし、それぞれ矢印Ｘ及び矢印Ｙで示す。また、Ｘ方向及びＹ方向に直交する鉛直方向をＺ方向とし、矢印Ｚで示す。
<Embodiment>
The joint structure of the steel frame member according to the embodiment of the present invention will be described. The two directions orthogonal to each other in the horizontal direction are the X direction and the Y direction, and are indicated by arrows X and Y, respectively. Further, the vertical direction orthogonal to the X direction and the Y direction is defined as the Z direction, and is indicated by an arrow Z.
［構造］
先ず、本実施形態の鉄骨部材の接合構造の全体構造について図１〜図３を用いて説明する。
[Construction]
First, the overall structure of the joint structure of the steel frame members of the present embodiment will be described with reference to FIGS. 1 to 3.
図１及び図３に示すように、鉄骨部材の接合構造１０は、鉄骨部材の一例としての鉄骨梁１２と可燃性の構造部材の一例としての木質柱１４とを有している。また、木質柱１４は、木質の上側柱１５Ｕ及び木質の下側柱１５Ｌを有し、上側柱１５Ｕと下側柱１５Ｌとの間の仕口部１００に設けられた接合部材１５０に鉄骨梁１２が接合されている（図２も参照）。 As shown in FIGS. 1 and 3, the joint structure 10 of the steel frame member has a steel frame beam 12 as an example of the steel frame member and a wooden column 14 as an example of the flammable structural member. Further, the wooden column 14 has a wooden upper column 15U and a wooden lower column 15L, and the steel beam 12 is attached to the joint member 150 provided at the joint portion 100 between the upper column 15U and the lower column 15L. Are joined (see also FIG. 2).
鉄骨梁１２は、上下方向に互いに対向する一対のフランジ部８２、８４と、一対のフランジ部８２、８４を接続するウェブ部８０と、を有するＨ形鋼によって構成されている。鉄骨梁１２の上側のフランジ部８２の上には、スラブ４８が設けられている。なお、本実施形態における鉄骨梁１２の材軸方向は、Ｘ方向である。また、本実施形態のスラブ４８は、鉄筋コンクリート製であるが、これに限定されるものではない。なお、鉄骨梁１２の周囲は、図示していない耐火被覆材によって覆われていてもよい。 The steel beam 12 is made of H-shaped steel having a pair of flange portions 82 and 84 facing each other in the vertical direction and a web portion 80 connecting the pair of flange portions 82 and 84. A slab 48 is provided on the upper flange portion 82 of the steel beam 12. The material axis direction of the steel frame beam 12 in this embodiment is the X direction. Further, the slab 48 of the present embodiment is made of reinforced concrete, but is not limited thereto. The periphery of the steel beam 12 may be covered with a fireproof coating material (not shown).
木質柱１４を構成する上側柱１５Ｕと下側柱１５Ｌとは、同様の構成である。よって、以降、上側柱１５Ｕを構成する部材には符号の後にＵを付し、下側柱１５Ｌを構成する部材には符号の後にＬを付する。なお、上下を区別する必要がない場合は、Ｕ及びＬを省略して説明する場合がある。また、図３には上側柱１５Ｕの断面が図示され、下側柱１５Ｌの断面は図示されていないが、前述のように上側柱１５Ｕと下側柱１５Ｌとは同様の構造であるので、図３を用いて下側柱１５Ｌの内部構造も説明する。 The upper pillar 15U and the lower pillar 15L constituting the wooden pillar 14 have the same configuration. Therefore, hereinafter, the members constituting the upper pillar 15U are marked with a U after the reference numerals, and the members constituting the lower pillar 15L are marked with an L after the reference numerals. When it is not necessary to distinguish between the upper and lower parts, U and L may be omitted for explanation. Further, although the cross section of the upper pillar 15U is shown and the cross section of the lower pillar 15L is not shown in FIG. 3, the upper pillar 15U and the lower pillar 15L have the same structure as described above. The internal structure of the lower pillar 15L will also be described with reference to 3.
可燃性の構造体の一例としての木質柱１４を構成する上側柱１５Ｕ及び下側柱１５Ｌは、耐火構造となっている。具体的には、上側柱１５Ｕ及び１５Ｌは、荷重を支持する木質の荷重支持部１８と、荷重支持部１８を耐火被覆する耐火層１７と、を有している。 As an example of the flammable structure, the upper pillar 15U and the lower pillar 15L constituting the wooden pillar 14 have a fireproof structure. Specifically, the upper columns 15U and 15L have a wooden load supporting portion 18 for supporting the load and a refractory layer 17 for refractory coating the load supporting portion 18.
荷重支持部１８は、集成材や無垢材等の木質材によって構成されている。この荷重支持部１８は、木質柱１４が負担する荷重を支持可能な剛性及び耐力を有している。耐火層１７は、荷重支持部１８の周囲を取り囲む燃止層２０と、燃止層２０の周囲を取り囲む木製の燃代層２２と、を備えている。 The load support portion 18 is made of a wood material such as laminated wood or solid wood. The load supporting portion 18 has rigidity and proof stress capable of supporting the load borne by the wooden pillar 14. The refractory layer 17 includes a fuel blocking layer 20 that surrounds the load support portion 18, and a wooden fuel allowance layer 22 that surrounds the periphery of the fuel blocking layer 20.
図３に示すように、燃止層２０は、荷重支持部１８の外周面に沿って交互に配列された複数のセメント系硬化体５０及び木質板材５２とで構成されている。セメント系硬化体５０及び木質板材５２は、角柱状に形成され、荷重支持部１８の材軸方向に沿って配置されている。これらのセメント系硬化体５０及び木質板材５２は、例えば、接着剤によって荷重支持部１８に接合されている。 As shown in FIG. 3, the fuel blocking layer 20 is composed of a plurality of cement-based hardened bodies 50 and a wood board 52 that are alternately arranged along the outer peripheral surface of the load supporting portion 18. The cement-based hardened body 50 and the wood board 52 are formed in a prismatic shape and are arranged along the material axis direction of the load supporting portion 18. The cement-based hardened body 50 and the wood board 52 are joined to the load support portion 18 by, for example, an adhesive.
セメント系硬化体５０は、例えば、モルタル、グラウト及び石膏等のように、木質板材５２よりも高熱容量の高熱容量部材によって形成されている。これにより、燃止層２０の熱容量が、全体として荷重支持部１８及び燃代層２２の熱容量よりも大きくなっている。この燃止層２０によって、火災時における燃代層２２の燃焼が自然鎮火され、その結果、荷重支持部１８の燃焼が抑制される。 The cement-based hardened body 50 is formed of a high-heat-capacity member having a higher heat-capacity than the wood board 52, such as mortar, grout, and gypsum. As a result, the heat capacity of the fuel stop layer 20 is larger than the heat capacity of the load support portion 18 and the fuel allowance layer 22 as a whole. The combustion stop layer 20 naturally extinguishes the combustion of the fuel allowance layer 22 at the time of a fire, and as a result, the combustion of the load support portion 18 is suppressed.
燃代層２２は、集成材等の木質材によって形成され、火災時に燃焼して断熱層として機能する炭化層を形成することにより、荷重支持部１８への火災熱の浸入を抑制する。この燃代層２２は、燃止層２０の外周面に沿った環状に形成されており、燃止層２０を囲むとともに、燃止層２０の外周面を被覆している。また、燃代層２２は、例えば、接着剤等によっても燃止層２０の外周面に接着されている。 The fuel allowance layer 22 is formed of a wood material such as laminated wood, and burns in the event of a fire to form a carbonized layer that functions as a heat insulating layer, thereby suppressing the infiltration of fire heat into the load support portion 18. The fuel allowance layer 22 is formed in an annular shape along the outer peripheral surface of the fuel stop layer 20, surrounds the fuel stop layer 20, and covers the outer peripheral surface of the fuel stop layer 20. Further, the fuel allowance layer 22 is adhered to the outer peripheral surface of the fuel stop layer 20 by, for example, an adhesive or the like.
図１及び図２に示すように、仕口部１００は、不燃材の一例としてのコンクリートＧで構成され、接合部材１５０が埋設されている。なお、コンクリートＧは、木質柱１４よりも熱容量が大きく且つ自由水を含む不燃材である。また、仕口部１００におけるコンクリートＧで構成された部分を不燃材部１０２とする。なお、図１では、判りやすくするため、接合部材１５０は全て実線で図示している。 As shown in FIGS. 1 and 2, the joint portion 100 is made of concrete G as an example of a noncombustible material, and a joining member 150 is embedded therein. The concrete G is a non-combustible material having a heat capacity larger than that of the wooden pillar 14 and containing free water. Further, the portion of the joint portion 100 made of concrete G is referred to as the noncombustible material portion 102. In FIG. 1, all the joining members 150 are shown by solid lines for the sake of clarity.
図１に示すように、接合部材１５０は、軸部１６０、上下のベースプレート１６２Ｕ、１６２Ｌ、上下の連結部１６４Ｕ、１６４Ｌ及び接合プレート１５２を有している。軸部１６０は、Ｈ形鋼で構成され、材軸方向を上下方向として配置されている。上下のベースプレート１６２Ｕ、１６２Ｌは、軸部１６０の上下に接合されている。上下の連結部１６４Ｕ、１６４Ｌは平面視で十字状とされ、上下のベースプレート１６２Ｕ、１６２Ｌに接合されている。なお、上下の連結部１６４Ｕ、１６４Ｌは、平面視で十字状の構成に限定されない。例えば、平面視でＩ字状であってもよい。 As shown in FIG. 1, the joining member 150 has a shaft portion 160, upper and lower base plates 162U and 162L, upper and lower connecting portions 164U and 164L, and a joining plate 152. The shaft portion 160 is made of H-shaped steel and is arranged with the material axis direction as the vertical direction. The upper and lower base plates 162U and 162L are joined to the upper and lower parts of the shaft portion 160. The upper and lower connecting portions 164U and 164L have a cross shape in a plan view and are joined to the upper and lower base plates 162U and 162L. The upper and lower connecting portions 164U and 164L are not limited to a cross-shaped configuration in a plan view. For example, it may be I-shaped in a plan view.
図１及び図２に示すように、接合プレート１５２は、一端部１５４が軸部１６０に接合され、他端部１５６が不燃材部１０２から突出している。そして、接合プレート１５２における他端部１５６に、鉄骨梁１２のウェブ部８０がボルト締結されている。 As shown in FIGS. 1 and 2, one end portion 154 of the joining plate 152 is joined to the shaft portion 160, and the other end portion 156 projects from the noncombustible material portion 102. Then, the web portion 80 of the steel frame beam 12 is bolted to the other end portion 156 of the joint plate 152.
図１に示すように、接合部材１５０の上下のベースプレート１６２Ｕ、１６２Ｌは、上側柱１５Ｕ及び下側柱１５Ｌの荷重支持部１８Ｕ、１８Ｌに当接し、連結部１６４Ｕ、１６４Ｌは荷重支持部１８Ｕ、１８Ｌに形成された切込部（図示省略）に挿入されている。そして、荷重支持部１８Ｕ、１８Ｌに略水平に形成された貫通孔（図示略）にドリフトピン１６９を貫通されることで、荷重支持部１８Ｕ、１８Ｌに固定されている。なお、ドリフトピン１６９は、荷重支持部１８Ｕ、１８Ｌ内に収まる長さとされ、貫通孔（図示略）の両端部は充填剤等で充填され塞がれている。 As shown in FIG. 1, the upper and lower base plates 162U and 162L of the joining member 150 are in contact with the load supporting portions 18U and 18L of the upper column 15U and the lower column 15L, and the connecting portions 164U and 164L are the load supporting portions 18U and 18L. It is inserted into a notch (not shown) formed in. Then, the drift pin 169 is passed through a through hole (not shown) formed substantially horizontally in the load supporting portions 18U and 18L, so that the drift pin 169 is fixed to the load supporting portions 18U and 18L. The drift pin 169 has a length that fits within the load support portions 18U and 18L, and both ends of the through hole (not shown) are filled with a filler or the like to close the drift pin 169.
仕口部１００のコンクリートＧが露出した露出面１０３には、遅延部材の一例して木質パネル２００が接合されている。本実施形態の木質パネル２００は、単板積層材で構成され、その板厚は１８ｍｍ以上が望ましい。なお、木質パネル２００の板厚分、仕口部１００を構成するコンクリートＧ部分、すなわち不燃材部１０２が小さくなっている。また、本実施形態の木質パネル２００は、コンクリートＧを打設する際の型枠として機能させることが可能である。 A wooden panel 200 is joined to the exposed surface 103 of the joint portion 100 where the concrete G is exposed, as an example of a delay member. The wood panel 200 of the present embodiment is made of a single-plate laminated material, and its thickness is preferably 18 mm or more. The concrete G portion, that is, the non-combustible material portion 102, which constitutes the joint portion 100, is made smaller by the thickness of the wood panel 200. Further, the wood panel 200 of the present embodiment can function as a formwork when placing concrete G.
なお、本実施形態では、木質パネル２００は、露出面１０３に耐熱性を有する接着剤で接合されているが、これに限定されるものではない。ビス等で木質パネル２００は、露出面１０３に接合されていてもよい。但し、ビス等で木質パネル２００を接合する場合は、ビス等を介して直接、仕口部１００のコンクリートＧに火災熱が伝導しないようにすることが望ましい。例えば、ビス頭部等が露出しないようにし、ビス穴を木栓等で塞ぐようにする。 In the present embodiment, the wood panel 200 is bonded to the exposed surface 103 with a heat-resistant adhesive, but the present invention is not limited to this. The wood panel 200 may be joined to the exposed surface 103 with screws or the like. However, when the wood panel 200 is joined with screws or the like, it is desirable that the fire heat is not directly conducted to the concrete G of the joint portion 100 through the screws or the like. For example, prevent the screw head and the like from being exposed, and close the screw hole with a cork or the like.
本実施形態の木質柱１４では、上側柱１５Ｕから仕口部１００を介しての下側柱１５Ｌへの軸力の伝達は、仕口部１００に設けられた接合部材１５０の軸部１６０によって主に伝達される。 In the wooden pillar 14 of the present embodiment, the axial force is transmitted from the upper pillar 15U to the lower pillar 15L via the joint portion 100 mainly by the shaft portion 160 of the joining member 150 provided in the joint portion 100. Is transmitted to.
［作用及び効果］
次に、本実施形態の作用及び効果について説明する。
[Action and effect]
Next, the operation and effect of this embodiment will be described.
火災時に、鉄骨梁１２のウェブ部８０から接合部材１５０を介して仕口部１００に火災熱が伝達され、仕口部１００が加熱されて蓄熱する。 In the event of a fire, fire heat is transmitted from the web portion 80 of the steel frame beam 12 to the joint portion 100 via the joint member 150, and the joint portion 100 is heated to store heat.
更に、仕口部１００は、直接火災熱によって加熱されて蓄熱する。しかし、本実施形態では、仕口部１００を構成するコンクリートＧが露出した露出面１０３に設けられた木質パネル２００が火災時に炭化して炭化層となる。そして、炭化層によって仕口部１００に直接浸入する火災熱が低減され、仕口部１００の温度上昇が効果的に遅延する。 Further, the joint portion 100 is directly heated by the heat of fire and stores heat. However, in the present embodiment, the wood panel 200 provided on the exposed surface 103 where the concrete G constituting the joint 100 is exposed is carbonized to form a carbonized layer in the event of a fire. Then, the carbonized layer reduces the fire heat that directly enters the joint 100, and effectively delays the temperature rise of the joint 100.
また、コンクリートＧは自由水を含んでいる。そして、火災時に自由水が放出することで、仕口部１００の温度上昇が抑制され、遅延する。 In addition, concrete G contains free water. Then, the free water is discharged in the event of a fire, so that the temperature rise of the joint 100 is suppressed and delayed.
したがって、火災時における仕口部１００の温度上昇が遅延するので、火災終了時に仕口部１００に蓄熱された蓄熱量が抑制され、その結果、木質柱１４の上側柱１５Ｕ及び下側柱１５Ｌの火災終了後の可燃部の温度上昇が抑制される。 Therefore, since the temperature rise of the joint portion 100 at the time of fire is delayed, the amount of heat stored in the joint portion 100 at the end of the fire is suppressed, and as a result, the upper pillar 15U and the lower pillar 15L of the wooden pillar 14 The temperature rise of the combustible part after the end of the fire is suppressed.
また、木質柱１４を構成する上側柱１５Ｕ及び下側柱１５Ｌは、荷重を支持する木質の荷重支持部１８と、荷重支持部１８の周囲に設けられた燃止層２０と、燃止層２０の周囲に設けられた木質の燃代層２２と、を有している。 Further, the upper pillar 15U and the lower pillar 15L constituting the wooden pillar 14 are a wooden load supporting portion 18 for supporting the load, a fuel blocking layer 20 provided around the load supporting portion 18, and a fuel blocking layer 20. It has a wood-based fuel allowance layer 22 provided around the wall.
よって、火災時に燃代層２２が炭化することで、燃止層２０及び荷重支持部１８へ浸入する火災熱が低減される。更に、燃止層２０によって燃焼が阻止される。このように、火災時には、荷重支持部１８の燃焼が防止又は抑制されるので、耐火性能を有する木質柱１４として使用することが可能となる。 Therefore, the carbonization of the fuel allowance layer 22 during a fire reduces the heat of the fire that infiltrates the fuel stop layer 20 and the load support portion 18. Further, the combustion stop layer 20 prevents combustion. As described above, in the event of a fire, the combustion of the load supporting portion 18 is prevented or suppressed, so that it can be used as a wooden pillar 14 having fire resistance.
また、木質パネル２００の板厚分、仕口部１００を構成するコンクリートＧ部分、すなわち不燃材部１０２を小さくすることができ、施工コストが抑制される。 Further, the thickness of the wooden panel 200 and the concrete G portion constituting the joint portion 100, that is, the noncombustible material portion 102 can be reduced, and the construction cost can be suppressed.
［耐火実験］
次に仕口部１００を構成するコンクリートＧが露出した露出面１０３に木質パネル２００を設けることによって、仕口部１００に直接浸入する火災熱が低減され、仕口部１００の温度上昇が効果的に遅延することを確認した耐火実験について説明する。
[Fire resistance test]
Next, by providing the wood panel 200 on the exposed surface 103 where the concrete G constituting the joint 100 is exposed, the fire heat that directly infiltrates the joint 100 is reduced, and the temperature rise of the joint 100 is effective. The fire resistance test confirmed to be delayed will be described.
耐火実験に使用した実験部材は、第一実験試料Ａ、第二実験試料Ｂ及び第三実験試料Ｃの三つを用いた。
第一実験試料Ａは、φ２３０ｍｍのコンクリート製の円柱である。
第二実験試料Ｂは、φ２３０ｍｍのコンクリート製の円柱の外周に層厚１８ｍｍの木質の耐火被覆層を設けたものである。
第三実験試料Ｃは、φ２３０ｍｍのコンクリート製の円柱の外周に層厚２７ｍｍの木質の耐火被覆層を設けたものである。
また、各試料のコンクリート製の円柱には、中心部に熱電対が埋設され、内部温度を測定する。
Three experimental members, the first experimental sample A, the second experimental sample B, and the third experimental sample C, were used as the experimental members used in the fire resistance experiment.
The first experimental sample A is a concrete cylinder having a diameter of 230 mm.
The second experimental sample B is obtained by providing a wood-based fireproof coating layer having a layer thickness of 18 mm on the outer circumference of a concrete cylinder having a diameter of 230 mm.
In the third experimental sample C, a wood-based fireproof coating layer having a layer thickness of 27 mm is provided on the outer circumference of a concrete cylinder having a diameter of 230 mm.
In addition, a thermocouple is embedded in the center of the concrete cylinder of each sample to measure the internal temperature.
そして、所定の温度で１４４分間、加熱した際のコンクリート製の円柱の内部温度の変化を示したものが、図４のグラフである。なお、グラフにおける一点鎖線Ａが第一実験試料Ａの結果であり、破線Ｂが第二実験試料Ｂの結果であり、実線Ｃが第三実験試料Ｂの結果である。 The graph of FIG. 4 shows the change in the internal temperature of the concrete cylinder when heated at a predetermined temperature for 144 minutes. The alternate long and short dash line A in the graph is the result of the first experimental sample A, the broken line B is the result of the second experimental sample B, and the solid line C is the result of the third experimental sample B.
このグラフを見ると判るように、第一実験試料Ａが最も温度上昇が大きく、第二実験試料Ｂ及び第三実験試料Ｃは第一実験試料Ａよりも温度上昇が小さい。また、第二実験試料Ｂよりも第三実験試料Ｃの方が、温度上昇が小さい。 As can be seen from this graph, the temperature rise of the first experimental sample A is the largest, and the temperature rise of the second experimental sample B and the third experimental sample C is smaller than that of the first experimental sample A. Further, the temperature rise of the third experimental sample C is smaller than that of the second experimental sample B.
よって、コンクリート製の円柱の外周に木質の耐火被覆層を設けることによって、コンクリート製の円柱に直接浸入する火災熱が低減され、コンクリート製の円柱の温度上昇が効果的に遅延することが確認された。また、その効果は、木質の耐火被覆層の層厚が大きいほど、その効果も大きいことが確認された。 Therefore, it was confirmed that by providing a wood-based fireproof coating layer on the outer circumference of the concrete cylinder, the fire heat that directly infiltrates the concrete cylinder is reduced, and the temperature rise of the concrete cylinder is effectively delayed. It was. It was also confirmed that the greater the thickness of the wood refractory coating layer, the greater the effect.
＜その他＞
尚、本発明は上記実施形態に限定されない。
<Others>
The present invention is not limited to the above embodiment.
例えば、上記実施形態では、仕口部１００を構成する不燃材はコンクリートＧであったが、これに限定されない。例えば、結晶水及び自由水を含む石膏で構成されていてもよい。要は、仕口部１００を構成する不燃材は、木質柱１４よりも熱容量が大きい材料又は結晶水及び自由水の少なくとも一方を含む材料で構成されていればよい。 For example, in the above embodiment, the non-combustible material constituting the joint 100 is concrete G, but the present invention is not limited to this. For example, it may be composed of gypsum containing water of crystallization and free water. In short, the non-combustible material constituting the joint portion 100 may be made of a material having a heat capacity larger than that of the wooden pillar 14 or a material containing at least one of water of crystallization and free water.
また、上記実施形態では、仕口部１００には、遅延部材の一例して木質パネル２００が接合されていたが、これに限定されない。例えば、仕口部１００には、石膏ボートが接合されていてもよい。また、遅延部材は、例えば、ＦＲＰ樹脂、ブチルゴム及び耐火塗料等の火災時に炭化する素材で構成されていてもよい。要は、遅延部材は、仕口部への熱伝達を遅延させる効果を有する部材であればよい。 Further, in the above embodiment, the wood panel 200 is joined to the joint portion 100 as an example of the delay member, but the present invention is not limited to this. For example, a gypsum boat may be joined to the joint portion 100. Further, the delay member may be made of a material that carbonizes in the event of a fire, such as FRP resin, butyl rubber, and refractory paint. In short, the delay member may be a member having an effect of delaying heat transfer to the joint portion.
また、上記実施形態では、木質柱１４の燃止層２０は、荷重支持部１８の外周面に沿って交互に配列された複数のセメント系硬化体５０及び木質板材５２とで構成されていたが、これに限定されない。燃止層２０は、木質心部３２への火災熱の浸入を抑制可能な層であればよく、例えば、難燃性を有する難燃性層や熱の吸収が可能な吸熱性層であってもよい。 Further, in the above embodiment, the fuel blocking layer 20 of the wooden column 14 is composed of a plurality of cement-based hardened bodies 50 and a wooden board 52 alternately arranged along the outer peripheral surface of the load supporting portion 18. , Not limited to this. The fuel blocking layer 20 may be a layer capable of suppressing the infiltration of fire heat into the wood core 32, and is, for example, a flame-retardant layer having flame retardancy or an endothermic layer capable of absorbing heat. May be good.
なお、難燃性層としては、木材に難燃薬剤を注入して不燃化処理した難燃薬剤注入層が挙げられる。また、吸熱性層としては、一般木材よりも熱容量が大きな材料、一般木材よりも断熱性が高い材料等及び一般木材よりも熱慣性が高い材料等が挙げられる。更にこれらの材料と一般木材とを適宜組み合わせて形成してもよい。 Examples of the flame retardant layer include a flame retardant chemical injection layer obtained by injecting a flame retardant into wood to make it nonflammable. Examples of the endothermic layer include a material having a heat capacity larger than that of general wood, a material having higher heat insulating property than general wood, and a material having higher thermal inertia than general wood. Further, these materials and general wood may be appropriately combined and formed.
また、難燃性層と吸熱性層とを適宜組み合わせて、例えば、難燃性層と吸熱性層とを交互に配置して、燃止層を形成してもよい。 Further, the flame-retardant layer and the endothermic layer may be appropriately combined, and for example, the flame-retardant layer and the endothermic layer may be alternately arranged to form a fuel blocking layer.
なお、一般木材とは、米松、唐松、檜、杉及びあすなろ等の一般の木造建築に用いられる木材である。また、一般木材よりも熱容量が大きな材料としては、モルタル、石材、ガラス、繊維補強セメント、石膏等の無機質材料、各種の金属材料などが挙げられる。また、一般木材よりも断熱性が高い材料としては、けい酸カルシウム板、ロックウール、グラスウールなどが挙げられる。一般木材よりも熱慣性が高い材料としては、セランガンバツ、ジャラ、ボンゴシ等の木材が挙げられる。 In addition, general wood is wood used for general wooden construction such as rice pine, Karamatsu, cypress, cedar and Asunaro. In addition, examples of materials having a larger heat capacity than general wood include mortar, stone, glass, fiber reinforced cement, inorganic materials such as gypsum, and various metal materials. Examples of materials having higher heat insulating properties than general wood include calcium silicate board, rock wool, and glass wool. Examples of materials having higher thermal inertia than general wood include woods such as Seranganbatsu, Jara, and Lophira alata.
また、上記実施形態では、荷重支持部１８を耐火被覆する耐火層１５は、燃止層２０及び燃代層２２の二層構造であったが、これに限定されない。例えば、燃代層２２を省略し、耐火層１５を燃止層２０のみで構成してもよい。更に、木質柱１４は、耐火層を有しない無耐火構造であってもよい。 Further, in the above embodiment, the refractory layer 15 for refractory coating the load support portion 18 has a two-layer structure of a fuel stop layer 20 and a fuel allowance layer 22, but is not limited thereto. For example, the fuel allowance layer 22 may be omitted, and the refractory layer 15 may be composed of only the fuel stop layer 20. Further, the wooden pillar 14 may have a fireproof structure having no fireproof layer.
また、上記実施形態では、鉄骨梁１２は、ウェブ部８０が木質柱１４に接合部材１５０を介して接合されていたが、これに限定されない。ウェブ部８０以外も木質柱１４に接合されていてもよい。 Further, in the above embodiment, in the steel frame beam 12, the web portion 80 is joined to the wooden column 14 via the joining member 150, but the present invention is not limited to this. Other than the web portion 80, it may be joined to the wooden pillar 14.
また、上記実施形態では、鉄骨梁１２は、木質柱１４に接合されていたが、これに限定されない。例えば、鉄骨梁１２の端部１３は、鉄骨梁１２とは別の梁、例えば木質梁に接合されていてもよい。また、鉄骨梁１２以外の鉄骨部材であってもよい。例えば、鉄骨部材が鉄骨柱であり、構造材は木質梁であってもよい。更に、鉄骨部材は、木質柱及び木質梁以外の可燃性の構造材に接合されていてもよい。例えば、ガラス繊維強化プラスチックや炭素繊維強化プラスチック等の繊維強化プラスチックで構成された柱や梁等の可燃性の構造材に接合されていてもよい。 Further, in the above embodiment, the steel beam 12 is joined to the wooden column 14, but the present invention is not limited to this. For example, the end portion 13 of the steel beam 12 may be joined to a beam different from the steel beam 12, for example, a wooden beam. Further, it may be a steel frame member other than the steel frame beam 12. For example, the steel member may be a steel column and the structural material may be a wooden beam. Further, the steel frame member may be joined to a flammable structural material other than the wooden column and the wooden beam. For example, it may be joined to a flammable structural material such as a column or a beam made of a fiber reinforced plastic such as a glass fiber reinforced plastic or a carbon fiber reinforced plastic.
更に、本発明の要旨を逸脱しない範囲において種々なる態様で実施し得る。また、複数の実施形態及び変形例等は、適宜、組み合わされて実施可能である。 Further, it can be carried out in various embodiments without departing from the gist of the present invention. In addition, a plurality of embodiments and modifications can be combined and implemented as appropriate.
１０ 接合構造
１２ 鉄骨梁（鉄骨部材の一例）
１４ 木質柱（可燃性の構造材の一例）
１８Ｌ 荷重支持部
１８Ｕ 荷重支持部
２０Ｌ 燃止層
２０Ｕ 燃止層
２２Ｌ 燃代層
２２Ｕ 燃代層
１００ 仕口部
１０２ コンクリート部
１０３ 露出面
１５０ 接合部材
２００ 木質パネル（遅延部材の一例）
Ｇ コンクリート（不燃材の一例）
10 Joint structure 12 Steel beam (an example of steel member)
14 Wooden pillars (an example of flammable structural materials)
18L Load-bearing part 18U Load-bearing part 20L Burn-off layer 20U Burn-stop layer 22L Burning allowance layer 22U Burning allowance layer 100 Joint 102 Concrete part 103 Exposed surface 150 Joining member 200 Wood panel (example of delay member)
G concrete (an example of non-combustible material)
Claims (3)
前記構造材に設けられ、前記構造材よりも熱容量が大きい不燃材又は結晶水及び自由水の少なくとも一方を含む不燃材で構成された仕口部と、
前記仕口部に設けられた接合部材に接合された鉄骨部材と、
前記仕口部の前記不燃材が露出した露出面に設けられ、前記仕口部への熱伝達を遅延させる遅延部材と、
を備えた鉄骨部材の接合構造。 With flammable structural materials
A joint portion provided on the structural material and composed of a non-combustible material having a heat capacity larger than that of the structural material or a non-combustible material containing at least one of water of crystallization and free water.
A steel frame member joined to the joining member provided at the joint portion and
A delay member provided on the exposed surface of the joint portion where the non-combustible material is exposed to delay heat transfer to the joint portion, and
Joint structure of steel frame members.
請求項１に記載の鉄骨部材の接合構造。 The delay member is a wooden panel material.
The joint structure of the steel frame member according to claim 1.
荷重を支持する木質の荷重支持部と、
前記荷重支持部の周囲に設けられた燃止層と、
前記燃止層の周囲に設けられた木質の燃代層と、
を有し、
前記仕口部に設けられた前記接合部材は、前記荷重支持部に接合されている、
請求項１又は請求項２に記載の鉄骨部材の接合構造。 The structural material is
A wooden load support part that supports the load,
A fuel blocking layer provided around the load supporting portion and
The woody fuel allowance layer provided around the fuel stop layer and
Have,
The joining member provided in the joint portion is joined to the load support portion.
The joint structure of the steel frame member according to claim 1 or 2.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008014036A (en) * | 2006-07-06 | 2008-01-24 | Takenaka Komuten Co Ltd | Joint structure of column and beam, and method of joining column and beam |
| JP2014029093A (en) * | 2012-07-31 | 2014-02-13 | Takenaka Komuten Co Ltd | Junction structure of structural members |
| JP2014029092A (en) * | 2012-07-31 | 2014-02-13 | Takenaka Komuten Co Ltd | Junction structure of structural members |
| JP2017053098A (en) * | 2015-09-07 | 2017-03-16 | 株式会社竹中工務店 | Junction structure of wood structural members |
| JP2018111940A (en) * | 2017-01-09 | 2018-07-19 | 大成建設株式会社 | Construction method for steel pipe column member and concrete filling steel pipe column |
| JP2019044514A (en) * | 2017-09-05 | 2019-03-22 | 国立研究開発法人森林研究・整備機構 | Joint structure between column and beam |
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2019
- 2019-08-07 JP JP2019145189A patent/JP7338122B2/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008014036A (en) * | 2006-07-06 | 2008-01-24 | Takenaka Komuten Co Ltd | Joint structure of column and beam, and method of joining column and beam |
| JP2014029093A (en) * | 2012-07-31 | 2014-02-13 | Takenaka Komuten Co Ltd | Junction structure of structural members |
| JP2014029092A (en) * | 2012-07-31 | 2014-02-13 | Takenaka Komuten Co Ltd | Junction structure of structural members |
| JP2017053098A (en) * | 2015-09-07 | 2017-03-16 | 株式会社竹中工務店 | Junction structure of wood structural members |
| JP2018111940A (en) * | 2017-01-09 | 2018-07-19 | 大成建設株式会社 | Construction method for steel pipe column member and concrete filling steel pipe column |
| JP2019044514A (en) * | 2017-09-05 | 2019-03-22 | 国立研究開発法人森林研究・整備機構 | Joint structure between column and beam |
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