JP2019015049A - Fireproof coating structure - Google Patents
Fireproof coating structure Download PDFInfo
- Publication number
- JP2019015049A JP2019015049A JP2017131478A JP2017131478A JP2019015049A JP 2019015049 A JP2019015049 A JP 2019015049A JP 2017131478 A JP2017131478 A JP 2017131478A JP 2017131478 A JP2017131478 A JP 2017131478A JP 2019015049 A JP2019015049 A JP 2019015049A
- Authority
- JP
- Japan
- Prior art keywords
- steel
- steel beam
- fireproof
- per unit
- structure according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000576 coating method Methods 0.000 title claims abstract description 73
- 239000011248 coating agent Substances 0.000 title claims abstract description 72
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 318
- 239000010959 steel Substances 0.000 claims abstract description 318
- 239000000463 material Substances 0.000 claims abstract description 94
- 238000010438 heat treatment Methods 0.000 claims description 16
- 230000009970 fire resistant effect Effects 0.000 claims description 15
- 239000002023 wood Substances 0.000 claims description 12
- 238000003763 carbonization Methods 0.000 claims description 8
- 239000006260 foam Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 description 9
- 238000002474 experimental method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 239000011490 mineral wool Substances 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 239000003351 stiffener Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 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
- 239000000835 fiber Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Building Environments (AREA)
Abstract
Description
本発明は、鉄骨梁の下部などに木質壁が接合された構造物の耐火被覆構造に関するものである。 The present invention relates to a fireproof covering structure for a structure in which a wooden wall is joined to a lower part of a steel beam.
従来、鉄骨梁の下部にＣＬＴ（直交集成板：Ｃｒｏｓｓ Ｌａｍｉｎａｔｅｄ Ｔｉｍｂｅｒ）などからなる木質壁を設置する場合において、鉄骨梁と木質壁との一体性を確保するために、双方を鋼製部材で接合した構造が採用されている（例えば、特許文献１を参照）。鋼製部材は、ベースプレート、ガセットプレート、スプライスプレート、ボルト、ドリフトピンなどで構成される。 Conventionally, when installing a wooden wall made of CLT (Cross Laminated Timber) or the like below the steel beam, both are joined with steel members to ensure the integrity of the steel beam and the wooden wall. Such a structure is employed (see, for example, Patent Document 1). The steel member includes a base plate, a gusset plate, a splice plate, a bolt, a drift pin, and the like.
火災時に加熱された鉄骨梁の耐力低下によって部材あるいは構造体が崩壊することを防止するために、通常、鉄骨梁には耐火被覆が施される（例えば、特許文献２、３を参照）。一方、木質壁は火災加熱によって自己燃焼してその断面が徐々に失われ最終的には焼失してしまう可能性が高い（ただし消防隊による放水等が行われれば、焼失を免れる可能性はある）。 In order to prevent a member or a structure from collapsing due to a decrease in the strength of a steel beam heated during a fire, the steel beam is usually provided with a fireproof coating (see, for example, Patent Documents 2 and 3). On the other hand, wooden walls are likely to burn by fire heating and lose their cross-section gradually and eventually be burnt down (however, if water is discharged by the fire brigade, there is a possibility of being burned off) ).
ところで、上記の鉄骨梁と木質壁の接合構造では、鉄骨梁には耐火被覆を施すが、木質壁には耐火被覆を施さない場合が多い。また、鉄骨梁と木質壁を接合する鋼製部材（以下、接合鋼製部材ということがある。）に耐火被覆が施されていないと火災時に高温になり、その熱エネルギーが鉄骨梁に流入し、鉄骨梁の耐力低下を助長するおそれがある。そのため、耐火上弱点となる接合鋼製部材の露出部についても鉄骨梁と同様に耐火被覆を施す必要がある。 By the way, in the joint structure of the steel beam and the wooden wall, the steel beam is provided with fireproof coating, but the wooden wall is often not provided with fireproof coating. In addition, if a steel member that joins a steel beam and a wooden wall (hereinafter sometimes referred to as a “joint steel member”) is not covered with a fireproof coating, it will become hot during a fire, and its thermal energy will flow into the steel beam. , There is a risk of reducing the strength of steel beams. For this reason, it is necessary to apply a fireproof coating to the exposed portion of the bonded steel member, which is a weak point in terms of fire resistance, similarly to the steel beam.
本発明は、上記に鑑みてなされたものであって、耐火上弱点となる接合部の温度上昇を抑制することのできる耐火被覆構造を提供することを目的とする。 This invention is made | formed in view of the above, Comprising: It aims at providing the fireproof coating structure which can suppress the temperature rise of the junction part used as a fireproof weak point.
上記した課題を解決し、目的を達成するために、本発明に係る耐火被覆構造は、鉄骨梁の下部または上部に鋼製部材を介して木質躯体を接合してなる構造物の耐火被覆構造であって、鉄骨梁と鋼製部材とを同じ被覆厚さで耐火被覆する耐火被覆材を備えることを特徴とする。 In order to solve the above problems and achieve the object, the fireproof covering structure according to the present invention is a fireproof covering structure of a structure formed by joining a wooden frame to a lower part or an upper part of a steel beam via a steel member. In addition, the present invention is characterized by comprising a fireproof coating material that fireproof coats the steel beam and the steel member with the same coating thickness.
また、本発明に係る他の耐火被覆構造は、上述した発明において、構造物は、鉄骨梁の下部または上部に鉄骨梁の長手方向に間隔をあけて配置された二つの鋼製部材を介して木質躯体を接合してなる構造物であり、二つの鋼製部材の間の範囲における鉄骨梁の耐火被覆材の被覆厚さが他の部位の耐火被覆材の被覆厚さよりも厚いことを特徴とする。 Another fireproof covering structure according to the present invention is the above-described invention, in which the structure is interposed between two steel members arranged at intervals in the longitudinal direction of the steel beam at the lower or upper part of the steel beam. It is a structure formed by joining wooden frames, characterized in that the coating thickness of the fire-resistant coating material of the steel beam in the range between the two steel members is thicker than the coating thickness of the fire-resistant coating material of other parts To do.
また、本発明に係る他の耐火被覆構造は、上述した発明において、鋼製部材の耐火被覆材の下端または上端は、鋼製部材が接合する直下または直上の木質躯体の上面または下面までの間に設けられ、木質躯体に対して重ね代を設けないことを特徴とする。 Another fireproof covering structure according to the present invention is the above-described invention. In the above-described invention, the lower end or upper end of the fireproof covering material of the steel member is between the upper surface or the lower surface of the wooden casing directly below or just above the steel member. It is characterized by not providing an overlap margin for the wooden frame.
また、本発明に係る他の耐火被覆構造は、上述した発明において、鋼製部材の耐火被覆材の下端または上端は、鋼製部材が接合する直下または直上の木質躯体を被覆する位置に設けられ、木質躯体に対して重ね代を設けたことを特徴とする。 Further, in another fireproof covering structure according to the present invention, in the above-described invention, the lower end or the upper end of the fireproof covering material of the steel member is provided at a position covering the wooden casing directly below or just above the steel member. It is characterized by providing an allowance for the wooden frame.
また、本発明に係る他の耐火被覆構造は、上述した発明において、木質躯体に対する耐火被覆材の重ね代の長さは、木質躯体を構成する木材の炭化速度と所定の耐火時間との積で得られる長さよりも長いことを特徴とする。 Further, in the fireproof coating structure according to the present invention, in the above-described invention, the length of the stacking allowance of the fireproof coating material on the wooden frame is a product of the carbonization rate of the wood constituting the wooden frame and a predetermined fireproof time. It is characterized by being longer than the length obtained.
また、本発明に係る他の耐火被覆構造は、上述した発明において、鉄骨梁は上下フランジを有するＨ形鋼からなり、鋼製部材が接合した部分の鉄骨梁の上下フランジ間に、この部分の熱容量を大きくするための熱容量割増し用の鋼材が設けられていることを特徴とする。 Further, in the fireproof covering structure according to the present invention, in the above-described invention, the steel beam is made of H-shaped steel having upper and lower flanges, and this portion of the steel beam is joined between the upper and lower flanges of the steel beam. A steel material for increasing the heat capacity for increasing the heat capacity is provided.
また、本発明に係る他の耐火被覆構造は、上述した発明において、鉄骨梁の耐火被覆材は、鉄骨梁を箱張り状に耐火被覆するものであり、熱容量割増し用の鋼材の使用量は、単位長さ当たりの鉄骨梁の鋼材体積と単位長さ当たりの熱容量割増し用の鋼材体積の和で、単位長さ当たりの鉄骨梁の加熱面積を除算した値が１２２以下という条件を満足する使用量であることを特徴とする。 Further, the other fireproof covering structure according to the present invention, in the above-described invention, the fireproof covering material of the steel beam fireproofly coats the steel beam in a box-like shape, and the usage amount of the steel material for increasing the heat capacity is as follows: The amount of steel that satisfies the condition that the value obtained by dividing the heating area of the steel beam per unit length by the sum of the steel volume of the steel beam per unit length and the steel volume for the additional heat capacity per unit length is 122 or less It is characterized by being.
また、本発明に係る他の耐火被覆構造は、上述した発明において、鉄骨梁の耐火被覆材は、鉄骨梁を直張り状（鉄骨断面形状に沿ってその周囲を被覆する形状）に耐火被覆するものであり、熱容量割増し用の鋼材の使用量は、単位長さ当たりの鉄骨梁の鋼材体積と単位長さ当たりの熱容量割増し用の鋼材体積の和で、単位長さ当たりの鉄骨梁の加熱面積を除算した値が１６８以下という条件を満足する使用量であることを特徴とする。 Further, in the fireproof covering structure according to the present invention, in the above-described invention, the fireproof covering material of the steel beam fireproofly coats the steel beam in a straight tension shape (a shape covering the periphery of the steel cross section). The amount of steel for extra heat capacity is the sum of the steel volume of the steel beam per unit length and the steel volume for the extra heat capacity per unit length, and the heating area of the steel beam per unit length. It is a usage amount that satisfies the condition that the value obtained by dividing is 168 or less.
また、本発明に係る他の耐火被覆構造は、上述した発明において、鋼製部材と木質躯体との間に、加熱を受けると発泡して断熱層を形成する材料が設けられていることを特徴とする。 Another fireproof covering structure according to the present invention is characterized in that, in the above-described invention, a material that foams and forms a heat insulating layer when heated is provided between the steel member and the wooden casing. And
本発明に係る耐火被覆構造によれば、鉄骨梁の下部または上部に鋼製部材を介して木質躯体を接合してなる構造物の耐火被覆構造であって、鉄骨梁と鋼製部材とを同じ被覆厚さで耐火被覆する耐火被覆材を備えるので、耐火上弱点となる接合部の温度上昇を抑制でき、耐力部材である鉄骨梁の構造耐火性（非損傷性）を確保することができるという効果を奏する。 The fireproof covering structure according to the present invention is a fireproof covering structure of a structure in which a wooden frame is joined to a lower part or an upper part of a steel beam via a steel member, and the steel beam and the steel member are the same. Because it is equipped with a fire-resistant coating material that fire-proofs the coating thickness, it is possible to suppress the temperature rise of the joint, which is a weak point in fire resistance, and to ensure the structural fire resistance (non-damage) of the steel beam that is a strength member There is an effect.
また、本発明に係る他の耐火被覆構造によれば、構造物は、鉄骨梁の下部または上部に鉄骨梁の長手方向に間隔をあけて配置された二つの鋼製部材を介して木質躯体を接合してなる構造物であり、二つの鋼製部材の間の範囲における鉄骨梁の耐火被覆材の被覆厚さが他の部位の耐火被覆材の被覆厚さよりも厚いので、二つの鋼製部材の間の鉄骨梁の温度上昇を抑制して、その耐火性能を向上することができるという効果を奏する。 Further, according to another fireproof covering structure according to the present invention, the structure includes a wooden frame through two steel members arranged at a lower portion or an upper portion of the steel beam and spaced in the longitudinal direction of the steel beam. It is a structure formed by joining, and since the coating thickness of the fire-resistant coating material of the steel beam in the range between the two steel members is thicker than the coating thickness of the fire-resistant coating material of other parts, the two steel members It is possible to suppress the temperature rise of the steel beam between and improve its fire resistance.
また、本発明に係る他の耐火被覆構造によれば、鋼製部材の耐火被覆材の下端または上端は、鋼製部材が接合する直下または直上の木質躯体の上面または下面までの間に設けられ、木質躯体に対して重ね代を設けないので、鋼製部材および鉄骨梁の温度上昇を抑制して、その耐火性能を向上することができるという効果を奏する。 Further, according to another fireproof covering structure according to the present invention, the lower end or upper end of the fireproof covering material of the steel member is provided between the upper surface or the lower surface of the wooden casing directly below or just above the steel member. Since no overlap allowance is provided for the wooden frame, the temperature rise of the steel member and the steel beam can be suppressed, and the fire resistance performance can be improved.
また、本発明に係る他の耐火被覆構造によれば、鋼製部材の耐火被覆材の下端または上端は、鋼製部材が接合する直下または直上の木質躯体を被覆する位置に設けられ、木質躯体に対して重ね代を設けたので、鋼製部材および鉄骨梁の温度上昇をより効果的に抑制して、その耐火性能をさらに向上することができるという効果を奏する。 Further, according to another fireproof covering structure according to the present invention, the lower end or the upper end of the fireproof covering material of the steel member is provided at a position covering the immediately below or directly above the wooden case where the steel member is joined, and the wooden case Since the overlap margin is provided, the temperature rise of the steel member and the steel beam can be more effectively suppressed, and the fire resistance performance can be further improved.
また、本発明に係る他の耐火被覆構造によれば、木質躯体に対する耐火被覆材の重ね代の長さは、木質躯体を構成する木材の炭化速度と所定の耐火時間との積で得られる長さよりも長いので、所定の耐火性能を確保することができるという効果を奏する。 Further, according to another fireproof covering structure according to the present invention, the length of the stacking allowance of the fireproof covering material on the wooden frame is a length obtained by the product of the carbonization rate of the wood constituting the wooden frame and the predetermined fireproof time. Since it is longer than this, there is an effect that a predetermined fire resistance can be ensured.
また、本発明に係る他の耐火被覆構造によれば、鉄骨梁は上下フランジを有するＨ形鋼からなり、鋼製部材が接合した部分の鉄骨梁の上下フランジ間に、この部分の熱容量を大きくするための熱容量割増し用の鋼材が設けられているので、この部分の鉄骨梁の温度上昇を抑制して、その耐火性能を向上することができるという効果を奏する。 According to another fireproof covering structure according to the present invention, the steel beam is made of H-shaped steel having upper and lower flanges, and the heat capacity of this portion is increased between the upper and lower flanges of the steel beam where the steel members are joined. Since the steel material for increasing the heat capacity is provided, the temperature rise of the steel beam in this portion can be suppressed, and the fire resistance performance can be improved.
また、本発明に係る他の耐火被覆構造によれば、鉄骨梁の耐火被覆材は、鉄骨梁を箱張り状に耐火被覆するものであり、熱容量割増し用の鋼材の使用量は、単位長さ当たりの鉄骨梁の鋼材体積と単位長さ当たりの熱容量割増し用の鋼材体積の和で、単位長さ当たりの鉄骨梁の加熱面積を除算した値が１２２以下という条件を満足する使用量であるので、所定の耐火性能を確保することができるという効果を奏する。 Further, according to another fireproof coating structure according to the present invention, the fireproof coating material of the steel beam is a fireproof coating of the steel beam in a box-like shape, and the usage amount of the steel material for increasing the heat capacity is unit length. The amount of steel that satisfies the condition that the value obtained by dividing the heating area of the steel beam per unit length by the sum of the steel material volume of the steel beam per unit and the steel volume for the additional heat capacity per unit length satisfies the condition of 122 or less. There is an effect that a predetermined fire resistance can be ensured.
また、本発明に係る他の耐火被覆構造によれば、鉄骨梁の耐火被覆材は、鉄骨梁を直張り状に耐火被覆するものであり、熱容量割増し用の鋼材の使用量は、単位長さ当たりの鉄骨梁の鋼材体積と単位長さ当たりの熱容量割増し用の鋼材体積の和で、単位長さ当たりの鉄骨梁の加熱面積を除算した値が１６８以下という条件を満足する使用量であるので、所定の耐火性能を確保することができるという効果を奏する。 Further, according to another fireproof coating structure according to the present invention, the fireproof coating material of the steel beam is a fireproof coating of the steel beam in a straight-line form, and the usage amount of the steel material for increasing the heat capacity is a unit length. This is the sum of the steel volume of the steel beam per unit and the volume of the steel material for the extra heat capacity per unit length, and the amount obtained by dividing the heating area of the steel beam per unit length satisfies the condition of 168 or less. There is an effect that a predetermined fire resistance can be ensured.
また、本発明に係る他の耐火被覆構造によれば、鋼製部材と木質躯体との間に、加熱を受けると発泡して断熱層を形成する材料が設けられているので、鋼製部材および鉄骨梁の温度上昇を抑制して、その耐火性能を向上することができるという効果を奏する。 In addition, according to another fireproof covering structure according to the present invention, a material that foams and forms a heat insulating layer when heated is provided between the steel member and the wooden casing. There is an effect that the temperature rise of the steel beam can be suppressed and the fire resistance can be improved.
以下に、本発明に係る耐火被覆構造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。 Embodiments of the fireproof covering structure according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.
図１に示すように、本発明の実施の形態に係る耐火被覆構造１００は、鉄骨梁１０の下部に接合鋼製部材１２（鋼製部材）を介して木質壁１４（木質躯体）を接合してなる構造物の耐火被覆構造であって、鉄骨梁１０と接合鋼製部材１２とを同じ被覆厚さで耐火被覆する耐火被覆材１６を備えるものである。なお、図１の例では、耐火被覆材１６の外縁を破線で表示している。 As shown in FIG. 1, the fireproof covering structure 100 according to the embodiment of the present invention joins a wooden wall 14 (wooden frame) to a lower part of a steel beam 10 via a joined steel member 12 (steel member). The structure has a fireproof covering structure 16 for fireproof covering the steel beam 10 and the bonded steel member 12 with the same covering thickness. In the example of FIG. 1, the outer edge of the fireproof covering material 16 is indicated by a broken line.
木質壁１４は、ラミナが直交するＣＬＴからなる矩形の壁体である。木質壁１４の左右上端は、鉄骨梁１０に接合鋼製部材１２を介して接合され、左右下端は、別の接合鋼製部材１２を介して床スラブ１８に接合されている。したがって、この構造物は、鉄骨梁１０の下部に鉄骨梁１０の長手方向に間隔をあけて配置された二つの接合鋼製部材１２を介して木質壁１２を接合してなる構造物である。なお、本実施の形態では、木質壁１４の高さ３００ｃｍ程度、幅２００ｃｍ程度、壁厚２０ｃｍ程度（７層７プライ）、ＣＬＴの繊維方向が鉛直面内である場合を想定しているが、本発明はこれに限るものではない。 The wooden wall 14 is a rectangular wall made of CLT whose lamina is orthogonal. The left and right upper ends of the wooden wall 14 are joined to the steel beam 10 via a joined steel member 12, and the left and right lower ends are joined to a floor slab 18 via another joined steel member 12. Therefore, this structure is a structure in which the wooden wall 12 is joined to the lower part of the steel beam 10 via the two joining steel members 12 arranged at intervals in the longitudinal direction of the steel beam 10. In the present embodiment, it is assumed that the wooden wall 14 has a height of about 300 cm, a width of about 200 cm, a wall thickness of about 20 cm (7 layers and 7 plies), and the CLT fiber direction is in the vertical plane. The present invention is not limited to this.
鉄骨梁１０は、上下フランジ２２、２４とウェブ２３を有するＨ形鋼で構成されている。鉄骨梁１０の上面には上階の床スラブ２０が設けられる。また、この鉄骨梁１０の接合鋼製部材１２が取り付く部分の上下フランジ２２、２４間には、鋼製プレート２６（熱容量割増し用の鋼材）が溶接されている。なお、本発明の鉄骨梁はＨ形鋼に限るものではなく、別の形態の鉄骨で構成されていてもよい。 The steel beam 10 is made of an H-shaped steel having upper and lower flanges 22 and 24 and a web 23. An upper floor slab 20 is provided on the upper surface of the steel beam 10. Further, a steel plate 26 (a steel material for increasing the heat capacity) is welded between the upper and lower flanges 22 and 24 of the portion to which the bonded steel member 12 of the steel beam 10 is attached. In addition, the steel beam of the present invention is not limited to the H-shaped steel, and may be configured by another form of steel frame.
接合鋼製部材１２は、木質壁１４の上下左右の四隅に配置されている。上下左右の接合鋼製部材１２は同様の構造であるため、以下においては、鉄骨梁１０に接合する接合鋼製部材１２を例にとり説明する。 The joined steel members 12 are arranged at the four corners of the wooden wall 14 in the vertical and horizontal directions. Since the upper, lower, left, and right bonded steel members 12 have the same structure, the following description will be given taking the bonded steel member 12 bonded to the steel beam 10 as an example.
接合鋼製部材１２は、鉄骨梁１０の下面に固定され、木質壁１４に向けて突出するプレート２８と、木質壁１４の上端から鉄骨梁１０に向けて突出するとともに木質壁１４の内部に挿入配置されるプレート３０とを備える。壁内部側のプレート３０は壁厚方向の中央に配置される。プレート２８、３０は上下に突き合わされており、その前後面にはプレート２８、３０を跨ぐ形でプレート３２が配置される。各プレート２８、３０、３２は貫通孔に通された複数の高力ボルト３４によって接合されている。木質壁１４の外側においてプレート３０の左右縁にプレート３６が溶接しており、鉄骨梁１０側のプレート２８の左右縁にもプレート３８が溶接している。これらプレート３６、３８同士もプレート４０と複数の高力ボルト４２によって接合されている。一方、木質壁１４の上端面にはプレート４４が当接配置されており、このプレート４４と壁内部側のプレート３０は溶接されている。 The bonded steel member 12 is fixed to the lower surface of the steel beam 10, protrudes toward the wooden wall 14, and projects from the upper end of the wooden wall 14 toward the steel beam 10 and is inserted into the wooden wall 14. And a plate 30 to be arranged. The plate 30 on the inner side of the wall is disposed at the center in the wall thickness direction. The plates 28 and 30 are abutted up and down, and the plate 32 is disposed on the front and rear surfaces thereof so as to straddle the plates 28 and 30. Each plate 28, 30, 32 is joined by a plurality of high-strength bolts 34 passed through the through holes. The plate 36 is welded to the left and right edges of the plate 30 outside the wooden wall 14, and the plate 38 is also welded to the left and right edges of the plate 28 on the steel beam 10 side. The plates 36 and 38 are also joined to the plate 40 by a plurality of high strength bolts 42. On the other hand, a plate 44 is disposed in contact with the upper end surface of the wooden wall 14, and the plate 44 and the plate 30 on the inner side of the wall are welded.
木質壁１４と壁内部側のプレート３０には、それぞれ対応する位置に水平方向の貫通孔が格子点状に複数設けられており、各貫通孔には連結用のドリフトピン４６が通されている。このドリフトピン４６によって木質壁１４と壁内部側のプレート３０は一体的に固定されている。また、割裂に対する補強のためにビス４８等が設けられている。 The wooden wall 14 and the plate 30 on the inner side of the wall are provided with a plurality of horizontal through-holes at corresponding positions in the form of lattice dots, and a connecting drift pin 46 is passed through each through-hole. . The wooden wall 14 and the plate 30 on the inner side of the wall are integrally fixed by the drift pin 46. Further, screws 48 and the like are provided for reinforcement against splitting.
また、端面側のプレート４４には貫通孔が複数設けられており、各貫通孔から木質壁１４の内部に向けてＬＳＢ（ラグスクリューボルト）５０が挿入配置されている。ＬＳＢ５０とドリフトピン４６は交互に隣接して配置される。なお、ＬＳＢ５０は外周に雄ねじが加工された鋼棒からなる。ＬＳＢ５０の上端部には図示しない開口が形成されており、この開口に連通する中空孔の内周面に雌ねじが加工されている。ＬＳＢ５０の開口が木質壁１４の端面側に露出するように、木質壁１４にねじ込んで固定しておき、端面側のプレート４４の貫通孔からＬＳＢ５０の雌ねじにボルト５２を螺合することによって、木質壁１４と端面側のプレート４４は一体的に固定される。 The plate 44 on the end face side is provided with a plurality of through holes, and LSBs (lag screw bolts) 50 are inserted from the through holes toward the inside of the wooden wall 14. The LSB 50 and the drift pin 46 are alternately arranged adjacent to each other. The LSB 50 is made of a steel rod having a male thread on the outer periphery. An opening (not shown) is formed in the upper end portion of the LSB 50, and a female screw is processed on the inner peripheral surface of the hollow hole communicating with the opening. By screwing and fixing the LSB 50 to the wooden wall 14 so that the opening of the LSB 50 is exposed to the end face side of the wooden wall 14, the bolt 52 is screwed into the female screw of the LSB 50 from the through hole of the plate 44 on the end face side. The wall 14 and the plate 44 on the end face side are fixed integrally.
なお、本実施の形態では、木質壁１４に対する壁内部側のプレート３０の埋込長３５０ｍｍ、幅５００ｍｍ、厚さ１２ｍｍ程度を想定し、端面側のプレート４４の壁厚方向の長さ２１０ｍｍ、幅５５０ｍｍ、厚さ３２ｍｍ程度を想定している。また、ドリフトピン４６の長さ２１０ｍｍ、径φ３２ｍｍ程度を想定し、木質壁１４に対するＬＳＢ５０の埋込長Ｌ＝７８０ｍｍ程度、ＬＳＢ４０の径φ２４ｍｍ程度を想定している。さらに、ＬＳＢ５０の埋込長Ｌを壁内部側のプレート３０の埋込長の２倍程度として想定し、隣り合うＬＳＢ５０とドリフトピン４６の間隔として５０ｍｍ程度を想定しているが、本発明はこれらの寸法に限るものではない。 In the present embodiment, it is assumed that the embedding length 350 mm, width 500 mm, and thickness 12 mm of the plate 30 on the wall inner side with respect to the wooden wall 14 is about 210 mm, and the width 210 mm in length in the wall thickness direction of the plate 44 on the end face side. 550 mm and a thickness of about 32 mm are assumed. Further, assuming that the drift pin 46 has a length of 210 mm and a diameter of about 32 mm, the embedded length LSB50 of the wood wall 14 is about 780 mm, and the LSB 40 has a diameter of about 24 mm. Further, the embedded length L of the LSB 50 is assumed to be about twice the embedded length of the plate 30 on the inner side of the wall, and the interval between the adjacent LSB 50 and the drift pin 46 is assumed to be about 50 mm. It is not limited to the dimensions.
耐火被覆材１６は、上述したように、鉄骨梁１０と接合鋼製部材１２とを同じ被覆厚さで耐火被覆するものである。この耐火被覆材１６としては、例えば耐熱ロックウール、けい酸カルシウム板などの成形板、熱膨張性の耐火塗装や耐火シートなどの耐火性を有する被覆材で構成することができる。本実施の形態では、被覆厚さ２０ｍｍ程度の耐熱ロックウールで構成する場合を想定しているが、本発明はこれに限るものではない。 As described above, the fireproof covering material 16 fireproofly coats the steel beam 10 and the bonded steel member 12 with the same covering thickness. The fireproof covering material 16 may be formed of a fired covering material such as a heat-resistant rock wool, a molded plate such as a calcium silicate plate, or a heat-expandable fire-resistant coating or a fire-resistant sheet. In the present embodiment, it is assumed that the heat-resistant rock wool having a coating thickness of about 20 mm is used, but the present invention is not limited to this.
上記のように構成した耐火被覆構造１００によれば、耐火上弱点となる接合部（接合鋼製部材１２）の温度上昇を抑制でき、耐力部材である鉄骨梁１０の構造耐火性（非損傷性）を確保することができる。 According to the fireproof covering structure 100 configured as described above, it is possible to suppress the temperature rise of the joint portion (joined steel member 12) that is a weak point in fire resistance, and the structural fire resistance (non-damage property) of the steel beam 10 that is a strength member. ) Can be secured.
また、接合鋼製部材１２が接合した部分の鉄骨梁１０の上下フランジ２２、２４間に、この部分の熱容量を大きくするための鋼製プレート２６が設けられているので、この部分の鉄骨梁１０の温度上昇を抑制して、その耐火性能を向上することができる。 Further, since the steel plate 26 for increasing the heat capacity of this portion is provided between the upper and lower flanges 22 and 24 of the steel beam 10 at the portion where the bonded steel member 12 is joined, the steel beam 10 at this portion is provided. The fire resistance can be improved by suppressing the temperature rise.
上記の実施の形態において、左右二つの接合鋼製部材１２の間の範囲の鉄骨梁１０の耐火被覆材１６の被覆厚さを、他の部位の耐火被覆材１６の被覆厚さよりも厚くしてもよい。後述の耐火実験の結果からわかるように、左右二つの接合鋼製部材１２の間の範囲の鉄骨梁１０は加熱時に他の部位よりも高温となりやすい。したがって、この範囲の被覆厚さを他の部位よりも厚くすることで、この範囲の鉄骨梁１０の温度上昇を抑制すれば、耐火性能を向上することができる。 In the above-described embodiment, the coating thickness of the fireproof coating material 16 of the steel beam 10 in the range between the two left and right bonded steel members 12 is made thicker than the coating thickness of the fireproof coating material 16 in other portions. Also good. As can be seen from the results of the fire resistance test described later, the steel beam 10 in the range between the two left and right bonded steel members 12 tends to be hotter than the other parts during heating. Therefore, by making the coating thickness in this range thicker than other parts, the fire resistance can be improved if the temperature rise of the steel beam 10 in this range is suppressed.
また、上記の実施の形態において、接合鋼製部材１２を被覆する耐火被覆材１６の下端を、接合鋼製部材１２が接合する直下の木質壁１４の上面までの間とし、木質壁１４に対して重ね代を設けないようにしてもよい。このようにすれば、接合鋼製部材１２および鉄骨梁１０の温度上昇を抑制して、その耐火性能を向上することができる。 Moreover, in said embodiment, let the lower end of the fireproof coating material 16 which coat | covers the joining steel member 12 be between the upper surfaces of the wooden wall 14 directly under which the joining steel member 12 joins, and with respect to the wooden wall 14 Thus, it is possible not to provide an overlap allowance. If it does in this way, the temperature rise of the joining steel member 12 and the steel beam 10 can be suppressed, and the fireproof performance can be improved.
また、上記の実施の形態において、接合鋼製部材１２の耐火被覆材１６の下端を、接合鋼製部材１２が接合する直下の木質壁１４まで延長して、木質壁１４に対して重ね代を設けてもよい。このようにすれば、接合鋼製部材１２および鉄骨梁１０の温度上昇をより効果的に抑制して、その耐火性能をさらに向上することができる。 Moreover, in said embodiment, the lower end of the fireproof coating material 16 of the joining steel member 12 is extended to the wooden wall 14 directly under which the joining steel member 12 joins, and an overlap margin is provided with respect to the wooden wall 14. It may be provided. If it does in this way, the temperature rise of the joining steel member 12 and the steel beam 10 can be suppressed more effectively, and the fireproof performance can further be improved.
ここで、木質壁１４に対する耐火被覆材１６の重ね代の長さを、木質壁１４を構成する木材の炭化速度と所定の耐火時間との積で得られる長さよりも長くすることが好ましい。このようにすれば、所定の耐火性能を確保することができる。木質壁１４に対する重ね代は、下記の式（１）で決定することができる。 Here, it is preferable that the length of the stacking margin of the fireproof covering material 16 on the wooden wall 14 is longer than the length obtained by the product of the carbonization rate of the wood constituting the wooden wall 14 and a predetermined fireproof time. In this way, a predetermined fire resistance can be ensured. The overlap allowance for the wooden wall 14 can be determined by the following equation (1).
Ｌｏ≧Ｖｗ×ｔｆ ・・・ 式（１）
ここに、Ｌｏ：重ね代長さ（ｍｍ）
Ｖｗ：木材の炭化速度：０．６〜１．０（ｍｍ／ｍｉｎ）
ｔｆ：耐火時間（ｍｉｎ）
Lo ≧ Vw × tf (1)
Here, Lo: overlap length (mm)
Vw: Carbonization rate of wood: 0.6 to 1.0 (mm / min)
tf: Fire resistance time (min)
例えば、炭化速度を０．７ｍｍ／ｍｉｎと仮定し、耐火時間を６０分とした場合に必要な重ね代長さは０．７×６０＝４２ｍｍ以上となる。 For example, assuming that the carbonization rate is 0.7 mm / min and the fireproof time is 60 minutes, the overlap allowance length required is 0.7 × 60 = 42 mm or more.
また、上記の実施の形態において、耐火被覆材１６が鉄骨梁１０を箱張り状に耐火被覆する構成としてもよい。この模式断面図を図８（１）、（２）に示す。この場合、鋼製プレート２６（熱容量割増し用の鋼材）の使用量としては、単位長さ当たりの鉄骨梁１０の鋼材体積と単位長さ当たりの鋼製プレート２６の鋼材体積の和で、単位長さ当たりの鉄骨梁１０の加熱面積を除算した値が１２２以下という条件を満足する使用量に設定することが好ましい。このようにすれば、所定の耐火性能を確保することができる。鋼製プレート２６の鋼材量は下記の式（２）で決定することができる。 Moreover, in said embodiment, it is good also as a structure where the fireproof covering material 16 fireproofly coats the steel beam 10 in a box-like shape. This schematic cross-sectional view is shown in FIGS. In this case, the usage amount of the steel plate 26 (steel material for increasing the heat capacity) is the sum of the steel material volume of the steel beam 10 per unit length and the steel material volume of the steel plate 26 per unit length. It is preferable to set the usage amount to satisfy the condition that the value obtained by dividing the heating area of the steel beam 10 per unit is 122 or less. In this way, a predetermined fire resistance can be ensured. The amount of steel material of the steel plate 26 can be determined by the following formula (2).
Ａｐ／（Ｖｓ＋Ｖｓｐ）≦１２２ ・・・ 式（２）
ここに、Ａｐ：単位長さ当たりの鉄骨梁の加熱面積（ｍ２／ｍ）
３面加熱を受ける箱張り状に耐火被覆した鉄骨梁の場合、
Ａｐ＝（梁成×２＋フランジ幅）×単位長さ、という計算式で求める。
Ｖｓ：単位長さ当たりの鉄骨梁の鋼材体積（ｍ３／ｍ）
Ｖｓｐ：単位長さ当たりの熱容量割増し用の鋼材体積（ｍ３／ｍ）
Ap / (Vs + Vsp) ≦ 122 (2)
Where Ap: heating area of steel beam per unit length (m 2 / m)
In the case of a steel beam with fireproof coating in a box-like shape subjected to three-side heating,
It is calculated by the following formula: Ap = (beam formation × 2 + flange width) × unit length.
Vs: Steel volume of steel beam per unit length (m 3 / m)
Vsp: Steel material volume for increasing the heat capacity per unit length (m 3 / m)
また、上記の実施の形態において、耐火被覆材１６が鉄骨梁１０を直張り状に耐火被覆する構成としてもよい。この模式断面図を図８（３）に示す。この場合、鋼製プレート２６（熱容量割増し用の鋼材）の使用量としては、単位長さ当たりの鉄骨梁１０の鋼材体積と単位長さ当たりの鋼製プレート２６の鋼材体積の和で、単位長さ当たりの鉄骨梁１０の加熱面積を除算した値が１６８以下という条件を満足する使用量に設定することが好ましい。このようにすれば、所定の耐火性能を確保することができる。鋼製プレート２６の鋼材量は下記の式（３）で決定することができる。 Moreover, in said embodiment, it is good also as a structure which the fireproof coating | covering material 16 fireproof coats the steel beam 10 in the shape of direct tension. This schematic cross-sectional view is shown in FIG. In this case, the usage amount of the steel plate 26 (steel material for increasing the heat capacity) is the sum of the steel material volume of the steel beam 10 per unit length and the steel material volume of the steel plate 26 per unit length. It is preferable to set the usage amount to satisfy the condition that the value obtained by dividing the heating area of the steel beam 10 per unit is 168 or less. In this way, a predetermined fire resistance can be ensured. The amount of steel material of the steel plate 26 can be determined by the following equation (3).
Ａｐ／（Ｖｓ＋Ｖｓｐ）≦１６８ ・・・ 式（３）
ここに、Ａｐ：単位長さ当たりの鉄骨梁の加熱面積（ｍ２／ｍ）
３面加熱を受ける直張り状に耐火被覆した鉄骨梁の場合、
Ａｐ＝
｛（梁成×２＋フランジ幅＋（フランジ幅−ウェブ厚）×２）×単位長さ
＋（鉄骨梁を軸方向に見た場合の熱容量割増し用の鋼製プレート１枚あたりの見付け面積）×２面×単位長さあたりの熱容量割増し用の鋼製プレートの枚数｝、という計算式で求める。
Ｖｓ：単位長さ当たりの鉄骨梁の鋼材体積（ｍ３／ｍ）
Ｖｓｐ：単位長さ当たりの熱容量割増し用の鋼材体積（ｍ３／ｍ）
Ap / (Vs + Vsp) ≦ 168 (3)
Where Ap: heating area of steel beam per unit length (m 2 / m)
In the case of a steel beam with a fire-resistant coating that is directly stretched and subjected to three-side heating,
Ap =
{(Beam formation x 2 + flange width + (flange width-web thickness) x 2) x unit length + (finding area per steel plate for additional heat capacity when viewing steel beams in the axial direction) x 2 planes × the number of steel plates for additional heat capacity per unit length}.
Vs: Steel volume of steel beam per unit length (m 3 / m)
Vsp: Steel material volume for increasing the heat capacity per unit length (m 3 / m)
また、上記の実施の形態において、接合鋼製部材１２と木質壁１４との間に、加熱を受けると発泡して断熱層を形成する耐火塗料や耐火シートなどの材料を設けてもよい。この場合、例えば、木質壁１４に接するプレート４４（ベースプレート）の下面をこうした耐火塗料や耐火シートで被覆してもよい。このようにすれば、接合鋼製部材１２および鉄骨梁１０の温度上昇を抑制して、その耐火性能を向上することができる。 Moreover, in said embodiment, you may provide materials, such as a refractory paint and a refractory sheet which foam and form a heat insulation layer, if it receives heat between the joining steel member 12 and the wooden wall 14. In this case, for example, the lower surface of the plate 44 (base plate) in contact with the wooden wall 14 may be covered with such a fireproof paint or fireproof sheet. If it does in this way, the temperature rise of the joining steel member 12 and the steel beam 10 can be suppressed, and the fireproof performance can be improved.
また、上記の実施の形態において、鉄骨梁１０の下部に木質壁１４が接合される場合を例にとり説明したが、本発明はこれに限るものではなく、鉄骨梁の上部に木質壁が接合される場合であってもよい。すなわち、上記の実施の形態において、木質壁１４の下部が接合鋼製部材１２と鉄骨梁を介して床スラブ１８に接合する構成とし、この接合鋼製部材１２と鉄骨梁とに同じ被覆厚さの耐火被覆材を設けてもよい。このようにしても上記と同様の作用効果を奏することができる。 In the above embodiment, the case where the wooden wall 14 is joined to the lower part of the steel beam 10 has been described as an example. However, the present invention is not limited to this, and the wooden wall is joined to the upper part of the steel beam. It may be the case. That is, in the above-described embodiment, the lower part of the wooden wall 14 is joined to the floor slab 18 via the joined steel member 12 and the steel beam, and the same covering thickness is applied to the joined steel member 12 and the steel beam. A fireproof coating material may be provided. Even if it does in this way, there can exist an effect similar to the above.
（本発明の効果の検証）
次に、本発明の効果を検証するために行った耐火実験と、この耐火実験による検証結果について説明する。
(Verification of the effect of the present invention)
Next, a fire resistance experiment conducted for verifying the effect of the present invention and a verification result by this fire resistance experiment will be described.
本実験は、実寸大の鉄骨梁と木質壁を接合してなる耐火被覆構造に対する耐火実験によってその性能確認を行ったものである。図２に、本実験に用いた試験体（耐火被覆前）の概略形状を示す。この試験体は上記の実施の形態と同様、鉄骨梁１０、接合鋼製部材１２、木質壁１４で構成されている。鉄骨梁１０と接合鋼製部材１２を耐熱ロックウール（厚さ２０ｍｍ）で被覆した。 In this experiment, the performance was confirmed by a fire resistance test for a fireproof covering structure formed by joining an actual steel beam and a wooden wall. In FIG. 2, the schematic shape of the test body (before fireproof coating) used for this experiment is shown. As in the above-described embodiment, this test body is composed of a steel beam 10, a bonded steel member 12, and a wooden wall 14. The steel beam 10 and the joined steel member 12 were covered with heat-resistant rock wool (thickness 20 mm).
鉄骨梁１０には、Ｈ−４００×２００×８×１３、Ｌ＝５８００ｍｍのＨ形鋼を用いた。鉄骨梁１０の左右両端の上面に吊フック６０を設けた。木質壁１４には、高さ１４７０×幅１８２０×厚さ２１０ｍｍのＣＬＴ壁を用いた。接合鋼製部材１２には、長さ５００×幅２１０×２８ｍｍのベースプレート（プレート４４に相当）と、Ｈ−５００×２００×１２×１９、Ｌ＝２２５ｍｍのＨ形鋼（二つ割り）と、厚さ９ｍｍのスプライスプレート（プレート３２、３６、３８、４０等に相当）を用いた。熱容量割増し用の鋼材である鋼製プレート２６には、厚さ９ｍｍのスチフナーを用いた。 For the steel beam 10, an H-shaped steel of H-400 × 200 × 8 × 13 and L = 5800 mm was used. Hanging hooks 60 were provided on the upper surfaces of the left and right ends of the steel beam 10. As the wooden wall 14, a CLT wall having a height of 1470 × width of 1820 × thickness of 210 mm was used. The joining steel member 12 includes a base plate (corresponding to the plate 44) of length 500 × width 210 × 28 mm, H-500 × 200 × 12 × 19, L-225 mm H-section steel (divided in two), thickness A 9 mm splice plate (corresponding to plates 32, 36, 38, 40, etc.) was used. A stiffener having a thickness of 9 mm was used for the steel plate 26 which is a steel material for increasing the heat capacity.
被覆前および被覆後の試験体の状況写真を図３（１）〜（３）に示す。なお、本実験では、左右の接合鋼製部材１２の耐火被覆仕様を異なる仕様とした。以下においては、左側の接合鋼製部材１２の耐火被覆仕様を接合部Ａ、右側の接合鋼製部材１２の耐火被覆仕様を接合部Ｂと呼ぶことにする。接合部Ａの状況写真を図４に、接合部Ｂの状況写真を図５に示す。これらの図に示すように、接合部Ａは耐火被覆材１６の木質壁１４に対する重ね代を設けない仕様（木質壁１４の上面位置まで耐火被覆を施した仕様）、接合部Ｂは耐火被覆材１６の木質壁１４に対する重ね代を設けた仕様（木質壁１４の上面位置から５０ｍｍ下まで重ね代をとって耐火被覆を施した仕様）となっている。 The situation photographs of the test specimens before and after coating are shown in FIGS. In this experiment, the fireproof coating specifications of the left and right bonded steel members 12 were different. In the following, the fireproof coating specification of the left bonded steel member 12 is referred to as a joint A, and the fireproof coating specification of the right bonded steel member 12 is referred to as a joint B. A situation photograph of the joint A is shown in FIG. 4, and a situation photograph of the joint B is shown in FIG. As shown in these drawings, the joint A has a specification that does not provide an overlap margin for the wood wall 14 of the fireproof covering 16 (a specification in which the fireproof covering is applied to the upper surface of the wood wall 14), and the joint B has a fireproof covering. The specification is provided with an overlap allowance for 16 wood walls 14 (a specification in which an overlap allowance is provided from the upper surface position of the wood wall 14 to 50 mm below).
接合部Ｂの重ね代長さは、炭化速度を０．７ｍｍ／ｍｉｎ、耐火時間を６０分として上記の式（１）より算定された長さ４２ｍｍ以上となる５０ｍｍを採用した。 As the overlap allowance length of the joint B, 50 mm, which is 42 mm or more calculated from the above formula (1), was adopted with a carbonization rate of 0.7 mm / min and a fireproof time of 60 minutes.
一方、図２に示すように、鉄骨梁１０の上下フランジ２２、２４間に熱容量割増し用の鋼材として、厚さ９ｍｍの鋼製プレート（スチフナー）を片面５枚、ウェブ両面で１０枚設置している。この鋼材量は、上記の式（２）にあてはめて算定すると次のとおり１２２以下となる条件を満たしている。 On the other hand, as shown in FIG. 2, five steel plates (stiffeners) with a thickness of 9 mm are installed between the upper and lower flanges 22 and 24 of the steel beam 10 as 10 steel plates (stiffeners) each having a thickness of 9 mm. Yes. This amount of steel material satisfies the condition of 122 or less as follows when calculated by applying to the above equation (2).
Ｖｓ＝０．００８１９２（ｍ３／ｍ）
Ｖｓｐ＝０．００６１４０（ｍ３／ｍ）
Ａｐ＝１．０（ｍ／ｍ）
Ａｐ／（Ｖｓ＋Ｖｓｐ）＝６９．８≦１２２
Vs = 0.008192 (m 3 / m)
Vsp = 0.006140 (m 3 / m)
Ap = 1.0 (m / m)
Ap / (Vs + Vsp) = 69.8 ≦ 122
試験体の温度測定位置を図６に示し、耐火実験において測定された温度の経時変化を図７に示す。図７（１）は試験体を入れた炉内温度、（２）はスパン中央の鉄骨梁断面鋼材温度、（３）は接合部Ａ外側の鉄骨梁断面鋼材温度、（４）は接合部Ｂ外側の鉄骨梁断面鋼材温度、（５）は接合部Ａ直上の鉄骨梁断面鋼材温度、（６）は接合部Ｂ直上の鉄骨梁断面鋼材温度、（７）は接合部Ａ内側の鉄骨梁断面鋼材温度、（８）は接合部Ｂ内側の鉄骨梁断面鋼材温度、（９）は接合部Ａ・Ｂのスプライスプレートの鋼材温度、（１０）は接合部Ａ・Ｂのベースプレートの鋼材温度である。 FIG. 6 shows the temperature measurement position of the test body, and FIG. 7 shows the change over time of the temperature measured in the fireproof experiment. 7 (1) shows the temperature inside the furnace in which the specimen was put, (2) shows the steel beam cross section steel temperature at the center of the span, (3) shows the steel beam cross section steel temperature outside the joint A, and (4) shows the joint B. Steel beam cross-section steel material temperature on the outer side, (5) Steel beam cross-section steel material temperature just above the joint A, (6) Steel beam cross-section steel material temperature just above the joint B, and (7) Steel beam cross-section inside the joint A Steel material temperature, (8) is the steel beam cross-section steel material temperature inside the joint B, (9) is the steel material temperature of the splice plate of the joint A / B, and (10) is the steel temperature of the base plate of the joint A / B. .
図７に示すように、鉄骨梁が耐力を保持する目安となる鋼材温度は５５０℃以下である。図７（２）〜（８）に示した接合部Ａと接合部Ｂの位置における鉄骨梁の鋼材温度はいずれも５５０℃以下であり、鉄骨梁が耐力を保持する目安となる温度以下となった。図７（２）〜（８）において接合部Ａと接合部Ｂを比較した場合、若干ではあるものの、耐火被覆材の重ね代を木質壁に設けた被覆仕様（接合部Ｂ）の方が、鋼材温度が低くなった。要求耐火時間が長くなった場合には重ね代の有効性が増すものと考えられる。 As shown in FIG. 7, the steel material temperature, which serves as a guideline for the steel beam to maintain the proof stress, is 550 ° C. or less. The steel material temperature of the steel beam at the positions of the joint A and the joint B shown in FIGS. 7 (2) to (8) is 550 ° C. or less, which is lower than the temperature at which the steel beam maintains the proof stress. It was. When comparing the joint A and the joint B in FIGS. 7 (2) to (8), although slightly, the covering specification (joint B) in which the overlap margin of the fireproof coating material is provided on the wooden wall is better. The steel material temperature became low. If the required fire resistance time becomes longer, it is considered that the effectiveness of the overlap allowance increases.
これに対して、図７（２）に示すように、鉄骨梁の一般部（接合部Ａ、Ｂの影響を受けにくい位置）の鋼材温度は６００℃近くまで上昇したことから、左右の接合部Ａ、Ｂの間の範囲の鉄骨梁の耐火被覆材の被覆厚さを厚くする必要があったと考えられる。 On the other hand, as shown in FIG. 7 (2), the steel material temperature of the general part of the steel beam (the position hardly affected by the joints A and B) has increased to nearly 600 ° C. It is thought that it was necessary to increase the coating thickness of the fireproof coating material of the steel beam in the range between A and B.
また、図７（９）と（１０）に示した接合部Ａ・Ｂのスプライスプレートの鋼材温度とベースプレートの鋼材温度は概ね５５０℃以下になったが、６０分よりも長い耐火時間が要求された場合、木質壁がない状態で鋼材が直接加熱される時間が長くなり５５０℃を超える可能性が極めて高い。このため、耐火時間が６０分を超える場合は、木質壁に接するベースプレートの下面を、加熱を受けると発泡して断熱層を形成する耐火塗料や耐火シートなどの材料で被覆することが好ましい。 Moreover, although the steel material temperature of the splice plate and the steel material temperature of the base plate of the joints A and B shown in FIGS. 7 (9) and (10) are approximately 550 ° C. or less, a fire resistance time longer than 60 minutes is required. In such a case, it takes a long time for the steel material to be directly heated in the absence of a wooden wall, and the possibility of exceeding 550 ° C. is extremely high. For this reason, when the fireproof time exceeds 60 minutes, it is preferable to coat the lower surface of the base plate in contact with the wooden wall with a material such as a fireproof paint or a fireproof sheet that foams when heated to form a heat insulating layer.
以上説明したように、本発明に係る耐火被覆構造によれば、鉄骨梁の下部または上部に鋼製部材を介して木質躯体を接合してなる構造物の耐火被覆構造であって、鉄骨梁と鋼製部材とを同じ被覆厚さで耐火被覆する耐火被覆材を備えるので、耐火上弱点となる接合部の温度上昇を抑制でき、耐力部材である鉄骨梁の構造耐火性（非損傷性）を確保することができる。 As described above, the fireproof covering structure according to the present invention is a fireproof covering structure of a structure formed by joining a wooden frame to a lower or upper part of a steel beam via a steel member, Because it is equipped with a fire-resistant coating material that fire-coats steel members with the same coating thickness, it can suppress the temperature rise of the joint, which is a weak point in fire resistance, and the structural fire resistance (non-damage) of the steel beam that is a strength member Can be secured.
また、本発明に係る他の耐火被覆構造によれば、構造物は、鉄骨梁の下部または上部に鉄骨梁の長手方向に間隔をあけて配置された二つの鋼製部材を介して木質躯体を接合してなる構造物であり、二つの鋼製部材の間の範囲における鉄骨梁の耐火被覆材の被覆厚さが他の部位の耐火被覆材の被覆厚さよりも厚いので、二つの鋼製部材の間の鉄骨梁の温度上昇を抑制して、その耐火性能を向上することができる。 Further, according to another fireproof covering structure according to the present invention, the structure includes a wooden frame through two steel members arranged at a lower portion or an upper portion of the steel beam and spaced in the longitudinal direction of the steel beam. It is a structure formed by joining, and since the coating thickness of the fire-resistant coating material of the steel beam in the range between the two steel members is thicker than the coating thickness of the fire-resistant coating material of other parts, the two steel members It is possible to suppress the temperature rise of the steel beam between and improve its fire resistance.
また、本発明に係る他の耐火被覆構造によれば、鋼製部材の耐火被覆材の下端または上端は、鋼製部材が接合する直下または直上の木質躯体の上面または下面までの間に設けられ、木質躯体に対して重ね代を設けないので、鋼製部材および鉄骨梁の温度上昇を抑制して、その耐火性能を向上することができる。 Further, according to another fireproof covering structure according to the present invention, the lower end or upper end of the fireproof covering material of the steel member is provided between the upper surface or the lower surface of the wooden casing directly below or just above the steel member. Since no overlap allowance is provided for the wooden frame, the temperature rise of the steel member and the steel beam can be suppressed, and its fire resistance can be improved.
また、本発明に係る他の耐火被覆構造によれば、鋼製部材の耐火被覆材の下端または上端は、鋼製部材が接合する直下または直上の木質躯体を被覆する位置に設けられ、木質躯体に対して重ね代を設けたので、鋼製部材および鉄骨梁の温度上昇をより効果的に抑制して、その耐火性能をさらに向上することができる。 Further, according to another fireproof covering structure according to the present invention, the lower end or the upper end of the fireproof covering material of the steel member is provided at a position covering the immediately below or directly above the wooden case where the steel member is joined, and the wooden case Since the overlap margin is provided, the temperature rise of the steel member and the steel beam can be more effectively suppressed, and the fire resistance performance can be further improved.
また、本発明に係る他の耐火被覆構造によれば、木質躯体に対する耐火被覆材の重ね代の長さは、木質躯体を構成する木材の炭化速度と所定の耐火時間との積で得られる長さよりも長いので、所定の耐火性能を確保することができる。 Further, according to another fireproof covering structure according to the present invention, the length of the stacking allowance of the fireproof covering material on the wooden frame is a length obtained by the product of the carbonization rate of the wood constituting the wooden frame and the predetermined fireproof time. Since it is longer than this, predetermined fireproof performance can be ensured.
また、本発明に係る他の耐火被覆構造によれば、鉄骨梁は上下フランジを有するＨ形鋼からなり、鋼製部材が接合した部分の鉄骨梁の上下フランジ間に、この部分の熱容量を大きくするための熱容量割増し用の鋼材が設けられているので、この部分の鉄骨梁の温度上昇を抑制して、その耐火性能を向上することができる。 According to another fireproof covering structure according to the present invention, the steel beam is made of H-shaped steel having upper and lower flanges, and the heat capacity of this portion is increased between the upper and lower flanges of the steel beam where the steel members are joined. Since the steel material for increasing the heat capacity is provided, the temperature rise of the steel beam in this portion can be suppressed and the fire resistance performance can be improved.
また、本発明に係る他の耐火被覆構造によれば、鉄骨梁の耐火被覆材は、鉄骨梁を箱張り状に耐火被覆するものであり、熱容量割増し用の鋼材の使用量は、単位長さ当たりの鉄骨梁の鋼材体積と単位長さ当たりの熱容量割増し用の鋼材体積の和で、単位長さ当たりの鉄骨梁の加熱面積を除算した値が１２２以下という条件を満足する使用量であるので、所定の耐火性能を確保することができる。 Further, according to another fireproof coating structure according to the present invention, the fireproof coating material of the steel beam is a fireproof coating of the steel beam in a box-like shape, and the usage amount of the steel material for increasing the heat capacity is unit length. The amount of steel that satisfies the condition that the value obtained by dividing the heating area of the steel beam per unit length by the sum of the steel material volume of the steel beam per unit and the steel volume for the additional heat capacity per unit length satisfies the condition of 122 or less. The predetermined fire resistance can be ensured.
また、本発明に係る他の耐火被覆構造によれば、鉄骨梁の耐火被覆材は、鉄骨梁を直張り状に耐火被覆するものであり、熱容量割増し用の鋼材の使用量は、単位長さ当たりの鉄骨梁の鋼材体積と単位長さ当たりの熱容量割増し用の鋼材体積の和で、単位長さ当たりの鉄骨梁の加熱面積を除算した値が１６８以下という条件を満足する使用量であるので、所定の耐火性能を確保することができる。 Further, according to another fireproof coating structure according to the present invention, the fireproof coating material of the steel beam is a fireproof coating of the steel beam in a straight-line form, and the usage amount of the steel material for increasing the heat capacity is a unit length. This is the sum of the steel volume of the steel beam per unit and the volume of the steel material for the extra heat capacity per unit length, and the amount obtained by dividing the heating area of the steel beam per unit length satisfies the condition of 168 or less. The predetermined fire resistance can be ensured.
また、本発明に係る他の耐火被覆構造によれば、鋼製部材と木質躯体との間に、加熱を受けると発泡して断熱層を形成する材料が設けられているので、鋼製部材および鉄骨梁の温度上昇を抑制して、その耐火性能を向上することができる。 In addition, according to another fireproof covering structure according to the present invention, a material that foams and forms a heat insulating layer when heated is provided between the steel member and the wooden casing. The fire resistance can be improved by suppressing the temperature rise of the steel beam.
以上のように、本発明に係る耐火被覆構造は、鉄骨梁の下部などに木質壁が接合された構造物に有用であり、特に、耐火上弱点となる接合部の温度上昇を抑制するのに適している。 As described above, the fireproof covering structure according to the present invention is useful for a structure in which a wooden wall is joined to the lower part of a steel beam or the like, and in particular, to suppress the temperature rise of the joint that becomes a fireproof weak point. Is suitable.
１０ 鉄骨梁
１２ 接合鋼製部材（鋼製部材）
１４ 木質壁（木質躯体）
１６ 耐火被覆材
１８，２０ 床スラブ
２３ ウェブ
２２ 上フランジ
２４ 下フランジ
２６ 鋼製プレート（熱容量割増し用の鋼材）
２８，３０，３２，３６，３８，４０，４４ プレート
３４，４２ 高力ボルト
４６ ドリフトピン
４８ ビス
５０ ＬＳＢ（ラグスクリューボルト）
５２ ボルト
６０ 吊フック
１００ 耐火被覆構造
10 Steel beam 12 Joined steel member (steel member)
14 Wood wall (wooden frame)
16 Fireproof coating 18, 20 Floor slab 23 Web 22 Upper flange 24 Lower flange 26 Steel plate (steel material for additional heat capacity)
28, 30, 32, 36, 38, 40, 44 Plate 34, 42 High-strength bolt 46 Drift pin 48 Screw 50 LSB (lag screw bolt)
52 bolt 60 hanging hook 100 fireproof covering structure
Claims (9)
二つの鋼製部材の間の範囲における鉄骨梁の耐火被覆材の被覆厚さが他の部位の耐火被覆材の被覆厚さよりも厚いことを特徴とする請求項１に記載の耐火被覆構造。 The structure is a structure formed by joining a wooden frame through two steel members arranged at intervals in the longitudinal direction of the steel beam at the lower or upper part of the steel beam,
The fire-resistant covering structure according to claim 1, wherein the thickness of the fire-resistant covering material of the steel beam in the range between the two steel members is thicker than the covering thickness of the fire-resistant covering material in the other part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017131478A JP7145590B2 (en) | 2017-07-04 | 2017-07-04 | Fireproof coating structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017131478A JP7145590B2 (en) | 2017-07-04 | 2017-07-04 | Fireproof coating structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2019015049A true JP2019015049A (en) | 2019-01-31 |
| JP7145590B2 JP7145590B2 (en) | 2022-10-03 |
Family
ID=65357172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2017131478A Active JP7145590B2 (en) | 2017-07-04 | 2017-07-04 | Fireproof coating structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP7145590B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021089053A (en) * | 2019-12-06 | 2021-06-10 | 株式会社トーネジ | Lag screw bolt for wood/steel hybrid structure and connection method |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5873666A (en) * | 1981-10-26 | 1983-05-02 | 清水建設株式会社 | Structure of earthquake-proof wall |
| JPH07189370A (en) * | 1993-12-28 | 1995-07-28 | Nippon Iton Kogyo Kk | Fitting structure of space partition panel |
| JPH10259676A (en) * | 1997-03-18 | 1998-09-29 | Oiles Ind Co Ltd | Fitting structure for vibration control device in vibration control wall |
| JP2000320050A (en) * | 1999-03-05 | 2000-11-21 | Shimizu Corp | Partition wall structure |
| JP2001227193A (en) * | 2000-02-18 | 2001-08-24 | Shimizu Corp | Damping wall |
| JP2002081148A (en) * | 2000-09-07 | 2002-03-22 | Sekisui Chem Co Ltd | Fire preventive, resistant wall construction |
| JP2002201734A (en) * | 2000-12-27 | 2002-07-19 | Daiwa House Ind Co Ltd | Fire resisting building structure |
| JP2015038290A (en) * | 2013-08-19 | 2015-02-26 | 株式会社平成建設 | Force bearing panel structure |
| JP2017089266A (en) * | 2015-11-11 | 2017-05-25 | 株式会社竹中工務店 | Fireproof structure of steel earthquake-resisting wall |
| JP2017101387A (en) * | 2015-11-30 | 2017-06-08 | Ｊｆｅスチール株式会社 | Composite covering fireproof structure of steel frame column and construction method thereof |
-
2017
- 2017-07-04 JP JP2017131478A patent/JP7145590B2/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5873666A (en) * | 1981-10-26 | 1983-05-02 | 清水建設株式会社 | Structure of earthquake-proof wall |
| JPH07189370A (en) * | 1993-12-28 | 1995-07-28 | Nippon Iton Kogyo Kk | Fitting structure of space partition panel |
| JPH10259676A (en) * | 1997-03-18 | 1998-09-29 | Oiles Ind Co Ltd | Fitting structure for vibration control device in vibration control wall |
| JP2000320050A (en) * | 1999-03-05 | 2000-11-21 | Shimizu Corp | Partition wall structure |
| JP2001227193A (en) * | 2000-02-18 | 2001-08-24 | Shimizu Corp | Damping wall |
| JP2002081148A (en) * | 2000-09-07 | 2002-03-22 | Sekisui Chem Co Ltd | Fire preventive, resistant wall construction |
| JP2002201734A (en) * | 2000-12-27 | 2002-07-19 | Daiwa House Ind Co Ltd | Fire resisting building structure |
| JP2015038290A (en) * | 2013-08-19 | 2015-02-26 | 株式会社平成建設 | Force bearing panel structure |
| JP2017089266A (en) * | 2015-11-11 | 2017-05-25 | 株式会社竹中工務店 | Fireproof structure of steel earthquake-resisting wall |
| JP2017101387A (en) * | 2015-11-30 | 2017-06-08 | Ｊｆｅスチール株式会社 | Composite covering fireproof structure of steel frame column and construction method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021089053A (en) * | 2019-12-06 | 2021-06-10 | 株式会社トーネジ | Lag screw bolt for wood/steel hybrid structure and connection method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP7145590B2 (en) | 2022-10-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6375025B2 (en) | Joint structure and construction method of lightweight fireproof partition wall | |
| JP5990425B2 (en) | Bonding structure of structural members | |
| Ariyanayagam et al. | Experimental study of non-load bearing light gauge steel framed walls in fire | |
| JP6482224B2 (en) | Structural member | |
| WO2020070938A1 (en) | Partition wall | |
| JP6719188B2 (en) | Structural member | |
| JP2019015049A (en) | Fireproof coating structure | |
| JP6758137B2 (en) | Fireproof bulkhead | |
| JP6936561B2 (en) | Fireproof structure of beam-column joint | |
| Sędłak et al. | Fire resistance of aluminium‐glazed partitions depending on their height | |
| JP6063917B2 (en) | Fireproof structure of outer wall | |
| JP2011026953A (en) | Compartmentation wall | |
| JP4700215B2 (en) | Fire protection wall | |
| JP6439980B2 (en) | Fireproof coating structure | |
| JP7228391B2 (en) | Column-beam connection structure | |
| JP2017210807A (en) | Composite coating refractory structure of steel column, and construction method thereof | |
| JP7380737B2 (en) | Fireproof coating structure of structure | |
| JP6832403B2 (en) | Structural members | |
| JP7446855B2 (en) | Fireproof coating structure and its construction method | |
| JP6846163B2 (en) | Exterior wall structure of the building | |
| KR20240042976A (en) | Finishing cover of steel structure and composite beam having the same | |
| JP4421584B2 (en) | Fireproof seal body and fireproof seal structure | |
| JP2023008615A (en) | Fire resistance structure of composite member | |
| JP6890082B2 (en) | Wood wall | |
| JP2022187207A (en) | Steel material temperature calculation method and program therefor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A80 | Written request to apply exceptions to lack of novelty of invention |
Free format text: JAPANESE INTERMEDIATE CODE: A80 Effective date: 20170720 |
|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20200701 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20210629 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20210713 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20210908 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20220111 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20220307 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20220412 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20220707 |
|
| C60 | Trial request (containing other claim documents, opposition documents) |
Free format text: JAPANESE INTERMEDIATE CODE: C60 Effective date: 20220707 |
|
| A911 | Transfer to examiner for re-examination before appeal (zenchi) |
Free format text: JAPANESE INTERMEDIATE CODE: A911 Effective date: 20220714 |
|
| C21 | Notice of transfer of a case for reconsideration by examiners before appeal proceedings |
Free format text: JAPANESE INTERMEDIATE CODE: C21 Effective date: 20220719 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20220913 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20220920 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 7145590 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |