JP2013028982A - Fire-resistant coating structure of duct penetration part of steel beam - Google Patents

Fire-resistant coating structure of duct penetration part of steel beam Download PDF

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JP2013028982A
JP2013028982A JP2011166555A JP2011166555A JP2013028982A JP 2013028982 A JP2013028982 A JP 2013028982A JP 2011166555 A JP2011166555 A JP 2011166555A JP 2011166555 A JP2011166555 A JP 2011166555A JP 2013028982 A JP2013028982 A JP 2013028982A
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duct
fireproof
steel beam
covering material
fireproof covering
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JP5947500B2 (en
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Masatsugu Yamazaki
正嗣 山崎
Eiichiro Matsumoto
英一郎 松本
Shiro Kondo
史朗 近藤
Haruhiro Shimizu
玄宏 清水
Shinpei Yamawaki
慎平 山脇
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Shimizu Construction Co Ltd
Nichias Corp
Shimizu Corp
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Shimizu Construction Co Ltd
Nichias Corp
Shimizu Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L5/00—Devices for use where pipes, cables or protective tubing pass through walls or partitions
    • F16L5/02—Sealing
    • F16L5/04—Sealing to form a firebreak device

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  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
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Abstract

PROBLEM TO BE SOLVED: To provide a fire-resistant coating structure of a duct penetration part of a steel beam capable of reducing the size of the inner diameter in a duct penetration hole formed in a steel beam.SOLUTION: In a fire-resistant coating structure 1A of a duct penetration part of a steel beam in which a duct having a fireproof covering material 2 wound around the outer peripheral surface 3a is inserted in a duct penetration hole 6 formed in a web 5 of a steel beam 4, the thickness dimension of a part of the fireproof covering material 2 which is at least arranged between the inner peripheral surface 6a of the duct penetration hole 6 and the outer peripheral surface 3a of the duct 3 is smaller than the thickness dimensions of the other parts.

Description

本発明は、鉄骨梁のダクト貫通部の耐火被覆構造に関する。   The present invention relates to a fireproof covering structure for a duct penetration portion of a steel beam.

鉄骨梁のダクト貫通部では、所定の材料で所定の厚さに形成された耐火被覆材をダクトに巻き付けることで、２時間耐火や３時間耐火などの国土交通大臣認定としてその耐火性能が認められている。
このため、特許文献１および２には、鉄骨梁のウェブに形成されたダクト貫通孔に、耐火被覆材が巻き付けられたダクトが挿通された鉄骨梁のダクト貫通部の耐火被覆構造が開示されている。 In steel ducts, the fire penetration performance is recognized by the Minister of Land, Infrastructure, Transport and Tourism, such as 2-hour fire resistance and 3-hour fire resistance, by wrapping the duct with a fire-resistant covering material formed in a predetermined thickness with a predetermined material. ing.
For this reason, Patent Documents 1 and 2 disclose a fireproof covering structure of a duct penetration portion of a steel beam in which a duct around which a fireproof coating material is wound is inserted in a duct through hole formed in a steel beam web. Yes.

特開２００９−１５０２１０号公報JP 2009-150210 A 特許第４１４３８４６号公報Japanese Patent No. 4143846

鉄骨梁のウェブに形成されるダクト貫通孔の内径（直径）は、耐火被覆材が巻き付けられたダクトを挿通させるために、ダクトの外径に耐火被覆材の厚さを加えた長さに形成される必要がある。
例えば、耐火被覆材をロックウールとし、３時間耐火の性能を確保する場合、ダクトに巻き付ける耐火被覆材の厚さが６０ｍｍとなるため、ダクト貫通孔の内径は、ダクト外径＋１２０ｍｍとなる。 The inner diameter (diameter) of the duct through-hole formed in the steel beam web is formed to the length of the outer diameter of the duct plus the thickness of the fire-resistant coating so that the duct wrapped with the fire-resistant coating is inserted. Need to be done.
For example, when the fireproof covering material is rock wool and the fireproof performance is ensured for 3 hours, the thickness of the fireproof covering material wound around the duct is 60 mm, so the inner diameter of the duct through hole is the outer diameter of the duct +120 mm.

しかしながら、鉄骨梁によっては、ウェブに対してダクト貫通孔の割合が大きくなるため、強度上、所望の内径のダクト貫通孔を形成することができないことがある。
このような場合は、梁成の大きい鉄骨梁に変更したり、ダクトの内径を小さくしてダクトの設置箇所を増やしたりして対応している。
しかし、梁成の大きい鉄骨梁に変更するには階高を高くする必要があり、また、ダクトの設置箇所を増やすとダクト工事などに手間がかかるため、工期やコストに影響を及ぼすことになる。 However, depending on the steel beam, the ratio of the duct through-hole to the web becomes large, so that it may not be possible to form a duct through-hole having a desired inner diameter in terms of strength.
Such cases are dealt with by changing to a steel beam having a large beam or by reducing the inner diameter of the duct and increasing the number of places where the duct is installed.
However, in order to change to a steel beam with a large beam, it is necessary to increase the floor height, and increasing the number of duct installation points takes time and labor for the duct work, which will affect the construction period and cost. .

本発明は、上述する問題点に鑑みてなされたもので、鉄骨梁に形成するダクト貫通孔の内径を小さくすることができる鉄骨梁のダクト貫通部の耐火被覆構造を提供することを目的とする。   The present invention has been made in view of the above-described problems, and an object thereof is to provide a fireproof covering structure for a duct penetration portion of a steel beam capable of reducing the inner diameter of a duct through hole formed in the steel beam. .

上記目的を達成するため、本発明に係る鉄骨梁のダクト貫通部の耐火被覆構造は、外周面に耐火被覆材が巻き付けられたダクトが、鉄骨梁のウェブに形成されたダクト貫通孔に挿通された鉄骨梁のダクト貫通部の耐火被覆構造において、前記耐火被覆材は、少なくとも前記ダクト貫通孔の内周面と前記ダクトの外周面との間に配された部分の厚さ寸法が、その他の部分の厚さ寸法よりも小さく形成されていることを特徴とする。   In order to achieve the above-mentioned object, the fireproof covering structure of the steel beam duct penetration portion according to the present invention is such that a duct having a fireproof covering material wrapped around the outer peripheral surface is inserted into a duct through hole formed in the steel beam web. In the fireproof covering structure of the duct penetration portion of the steel beam, the fireproof covering material has at least a thickness dimension of a portion disposed between the inner peripheral surface of the duct through hole and the outer peripheral surface of the duct. It is characterized by being formed smaller than the thickness dimension of the part.

本発明では、耐火被覆材は、ダクト貫通孔の内周面とダクトの外周面との間に配された部分の厚さ寸法が、その他の部分の厚さ寸法よりも小さく形成されているため、ダクト貫通孔の内径を、従来のようにダクトの外径に耐火被覆材全体の厚さを加えた寸法とする場合と比べて小さくすることができる。   In the present invention, the fireproof coating material is formed such that the thickness dimension of the portion disposed between the inner peripheral surface of the duct through hole and the outer peripheral surface of the duct is smaller than the thickness dimension of the other portions. The inner diameter of the duct through-hole can be reduced as compared with the conventional case in which the outer diameter of the duct is added to the thickness of the entire refractory coating material.

また、本発明に係る鉄骨梁のダクト貫通部の耐火被覆構造では、前記耐火被覆材は、前記ダクトの外周面に巻き付けられた第１耐火被覆材と、該第１耐火被覆材の外周面に巻き付けられた第２耐火被覆材と、を備え、前記第１耐火被覆材は、前記ダクト貫通孔に挿通されるとともに、該ダクト貫通孔から前記ダクトの軸方向前後の所定範囲に巻き付けられ、前記第２耐火被覆材は、前記ダクト貫通孔に挿通されず、前記所定範囲のみに巻き付けられていることが好ましい。
このようにすることにより、ダクト貫通孔の内径は、ダクト外径に第１耐火被覆材の厚さを加えた寸法とすればよいため、従来のようにダクトの外径に耐火被覆材全体の厚さを加えた寸法とする場合と比べて小さくすることができる。 Moreover, in the fireproof coating structure of the duct penetration part of the steel beam according to the present invention, the fireproof coating material includes a first fireproof coating material wound around an outer peripheral surface of the duct, and an outer peripheral surface of the first fireproof coating material. A second fire-resistant covering material wound around, the first fire-resistant covering material is inserted into the duct through-hole and wound around a predetermined range in the axial direction of the duct from the duct through-hole, It is preferable that the second fireproof covering material is not inserted into the duct through-hole and is wound only in the predetermined range.
By doing in this way, the inner diameter of the duct through hole may be a dimension obtained by adding the thickness of the first fireproof coating material to the outer diameter of the duct. The size can be reduced as compared with the case where the thickness is added.

また、本発明に係る鉄骨梁のダクト貫通部の耐火被覆構造では、前記第１耐火被覆材は、セラミックファイバーまたはロックウールを材料として形成され、前記第２耐火被覆材は、ロックウールを材料として形成されていることが好ましい。
このようにすることにより、第１耐火被覆材の厚さを薄くすることができるため、ダクト貫通孔の内径をより小さくすることができる。
特に、第１耐火被覆材が、セラミックファイバーを材料として形成されることで薄くなるため、ダクト貫通孔の内径をより小さくすることができる。 Moreover, in the fireproof covering structure of the duct penetration part of the steel beam according to the present invention, the first fireproof covering material is formed of ceramic fiber or rock wool, and the second fireproof covering material is rock wool. Preferably it is formed.
By doing in this way, since the thickness of the 1st fireproof covering material can be made thin, the internal diameter of a duct through-hole can be made smaller.
In particular, since the first refractory coating material is made thin by using ceramic fiber as a material, the inner diameter of the duct through-hole can be further reduced.

本発明によれば、ダクト貫通孔の内径を従来よりも小さくすることができることにより、従来のように所望の内径のダクト貫通孔を形成するために梁成を大きくしたり、ダクト貫通孔の数を増やしたりする必要がないため、コストの増加を防止することができるとともに、工期短縮を図ることができる。   According to the present invention, the inner diameter of the duct through-hole can be made smaller than before, so that the beam formation can be increased in order to form a duct through-hole with a desired inner diameter as in the past, or the number of duct through-holes can be increased. Therefore, it is possible to prevent an increase in cost and shorten the construction period.

本発明の第１実施形態による鉄骨梁のダクト貫通部の耐火被覆構造の一例を示す図で図２のＡ−Ａ線断面図である。It is a figure which shows an example of the fireproof coating structure of the duct penetration part of the steel beam by 1st Embodiment of this invention, and is the sectional view on the AA line of FIG. 図２は図１のＢ−Ｂ線断面図である。2 is a cross-sectional view taken along line BB in FIG. 本発明の第２実施形態による鉄骨梁のダクト貫通部の耐火被覆構造の一例を示す図である。It is a figure which shows an example of the fireproof coating structure of the duct penetration part of the steel beam by 2nd Embodiment of this invention. 従来の鉄骨梁のダクト貫通部の耐火被覆構造を示す図である。It is a figure which shows the fireproof coating structure of the duct penetration part of the conventional steel beam.

（第１実施形態）
以下、本発明の実施形態による鉄骨梁のダクト貫通部の耐火被覆構造について、図１および図２に基づいて説明する。
図１に示すように、第１実施形態による鉄骨梁のダクト貫通部の耐火被覆構造１Ａでは、耐火被覆材２が外周面３ａに巻き付けられたダクト３が、鉄骨梁４のウェブ５に形成されたダクト貫通孔６に挿通されている。
なお、本実施形態による鉄骨梁４のダクト貫通部の耐火被覆構造１Ａでは、３時間耐火の国土交通大臣認定の耐火性能を確保可能なものとしている。 (First embodiment)
Hereinafter, the fireproof covering structure of the duct penetration part of the steel beam by embodiment of this invention is demonstrated based on FIG. 1 and FIG.
As shown in FIG. 1, in the fireproof covering structure 1A of the duct penetration part of the steel beam according to the first embodiment, the duct 3 in which the fireproof covering material 2 is wound around the outer peripheral surface 3a is formed on the web 5 of the steel beam 4. It is inserted through the duct through hole 6.
In addition, in the fireproof covering structure 1A of the duct penetration part of the steel beam 4 by this embodiment, it shall be able to ensure the fireproof performance of the 3-hour fireproof approved by the Minister of Land, Infrastructure, Transport and Tourism.

鉄骨梁４は、本実施形態ではＨ形鋼で、上方に上階の床スラブ７が配されて、下方および両側方には耐火被覆材８が袋状に巻き付けられている。
ダクト３は、例えば、厚さ０．５ｍｍの鋼板を外径２００ｍｍの円筒状に形成したもので、長さ方向（ダクト３の軸方向）の両端部３ｂ，３ｂ（図１参照）に他のダクトが接合可能に構成されている。 The steel beam 4 is H-shaped steel in the present embodiment, and an upper floor slab 7 is arranged on the upper side, and a fireproof covering material 8 is wound around the lower side and both sides in a bag shape.
For example, the duct 3 is formed by forming a steel plate having a thickness of 0.5 mm into a cylindrical shape having an outer diameter of 200 mm, and other ends 3b and 3b (see FIG. 1) in the length direction (the axial direction of the duct 3). The duct is configured to be joinable.

耐火被覆材２は、ダクト３の長さ方向の中央部３ｃ側の外周面３ａに巻き付けられた第１耐火被覆材２１と、この第１耐火被覆材２１の外周面２１ａに巻き付けられた第２耐火被覆材２２と、の２層構造に形成されている。
第１耐火被覆材２１は、厚さｔ１が２５ｍｍのセラミックファイバーのシート（二酸化ケイ素繊維系フェルト）を円筒状に形成したもので、ピンなどの係止具によってダクト３の外周面３ａに固定されている。
第２耐火被覆材２２は、厚さｔ２が４０ｍｍのロックウールのシート（無機繊維フェルト）を円筒状に形成したもので、第１耐火被覆材２１と密着している。 The fire-resistant covering material 2 includes a first fire-resistant covering material 21 wound around the outer peripheral surface 3 a on the central portion 3 c side in the length direction of the duct 3 and a second fire-resistant covering material 2 wound around the outer peripheral surface 21 a of the first fire-resistant covering material 21. It is formed in a two-layer structure with a fireproof covering material 22.
The first fireproof covering material 21 is a cylindrically formed ceramic fiber sheet (silicon dioxide fiber felt) having a thickness t1 of 25 mm, and is fixed to the outer peripheral surface 3a of the duct 3 by a locking tool such as a pin. ing.
The second fireproof coating material 22 is a rock wool sheet (inorganic fiber felt) having a thickness t2 of 40 mm formed in a cylindrical shape, and is in close contact with the first fireproof coating material 21.

第１耐火被覆材２１は、ダクト３とともに鉄骨梁４のダクト貫通孔６に挿通されていて、周方向に間隔をあけて固定された振れ止め部材２３が鉄骨梁４のウェブ５をダクト貫通孔６の内側から挟持することで、ダクト３および第１耐火被覆材２１の位置が固定されている。
また、第２耐火被覆材２２は、ダクト貫通孔６に挿通されずに、ダクト貫通孔６からダクト３の長さ方向前後にに配されている。そして、第２耐火被覆材２２は、長さ方向に２つに分割され、第２耐火被覆材分割体２４，２４として配されている。２つの第２耐火被覆材分割体２４，２４は、それぞれ鉄骨梁４のウェブ５の両側に配されて、ウェブ５側の端部２４ａ（図１参照）がウェブ５と当接するように配されている。 The first fireproof covering material 21 is inserted into the duct through-hole 6 of the steel beam 4 together with the duct 3, and the steady member 23 fixed at intervals in the circumferential direction connects the web 5 of the steel beam 4 to the duct through-hole. 6, the positions of the duct 3 and the first fireproof covering material 21 are fixed.
Further, the second fireproof covering material 22 is not inserted through the duct through-hole 6 but is disposed in the longitudinal direction of the duct 3 from the duct through-hole 6. And the 2nd fireproof coating material 22 is divided | segmented into two in the length direction, and is distribute | arranged as the 2nd fireproof coating material division body 24,24. The two second fireproof covering material divisions 24 and 24 are respectively arranged on both sides of the web 5 of the steel beam 4 so that the end 24a (see FIG. 1) on the web 5 side is in contact with the web 5. ing.

このため、耐火被覆材２は、ダクト貫通孔６の内周面とダクト３の外周面３ａとの間に配された部分の厚さ寸法（第１耐火被覆材２１の厚さｔ１）が、その他の部分の厚さ寸法（第１耐火被覆材２１と第２耐火被覆材２２とをあわせた厚さｔ１＋ｔ２）よりも小さく形成されていることになる。
また、図１に示すように、ダクト貫通孔６の内径φ１は、ダクト３の外径φ２に第１耐火被覆材２１の厚さｔ１を加えた寸法（２００ｍｍ＋２５ｍｍ＋２５ｍｍ＝２５０ｍｍ）となっている。 For this reason, the fireproof covering material 2 has a thickness dimension (thickness t1 of the first fireproof covering material 21) of the portion arranged between the inner peripheral surface of the duct through-hole 6 and the outer peripheral surface 3a of the duct 3. It is formed smaller than the thickness dimension of other portions (thickness t1 + t2 in which the first fireproof covering material 21 and the second fireproof covering material 22 are combined).
As shown in FIG. 1, the inner diameter φ1 of the duct through-hole 6 is a dimension (200 mm + 25 mm + 25 mm = 250 mm) obtained by adding the thickness t1 of the first fireproof covering material 21 to the outer diameter φ2 of the duct 3.

また、第１耐火被覆材２１の両端部２１ｂ，２１ｂ、および、第２耐火被覆材分割体２４，２４におけるウェブ５側と反対側の端部２４ｂ，２４ｂは、鉄骨梁４に巻き付けられた耐火被覆材８と当接している。鉄骨梁４に巻き付けられた耐火被覆材８は、ダクト３の第１耐火被覆材２１および第２耐火被覆材２２が巻き付けられている部分よりも長さ方向の両端部３ｂ，３ｂ側でダクト３の外周面３ａと当接している。   Further, both end portions 21 b and 21 b of the first fireproof covering material 21 and end portions 24 b and 24 b opposite to the web 5 side in the second fireproof covering material divided bodies 24 and 24 are fireproof wound around the steel beam 4. It is in contact with the covering material 8. The fire-resistant covering material 8 wound around the steel beam 4 has the duct 3 on both ends 3b and 3b side in the length direction from the portion where the first fire-resistant covering material 21 and the second fire-resistant covering material 22 of the duct 3 are wound. Is in contact with the outer peripheral surface 3a.

つぎに、本実施形態の鉄骨梁のダクト貫通部の耐火被覆構造１Ａの施工方法について説明する。
まず、鉄骨梁４の製造工場において、予め鉄骨梁４のウェブ５にダクト貫通孔６を穿孔する。また、ダクト貫通孔６に挿通させるダクト３の長さ方向の中央部側の外周面３ａに第１耐火被覆材２１を巻き付ける。なお、ダクト３への第１耐火被覆材２１の巻き付けは、ダクトの製造工場で予め行っておいてもよい。 Below, the construction method of the fireproof coating structure 1A of the duct penetration part of the steel beam of this embodiment is demonstrated.
First, a duct through-hole 6 is drilled in the web 5 of the steel beam 4 in advance at the steel beam 4 manufacturing factory. Moreover, the 1st fireproof coating | covering material 21 is wound around the outer peripheral surface 3a of the center part side of the length direction of the duct 3 inserted in the duct through-hole 6. FIG. The winding of the first fireproof covering material 21 around the duct 3 may be performed in advance at the duct manufacturing factory.

続いて、第１耐火被覆材２１を巻き付けたダクト３をダクト貫通孔６に挿通させる。このとき、第１耐火被覆材２１の外周面２１ａとダクト貫通孔６の内周面６ａとが当接する。そして、第１耐火被覆材２１に固定された振れ止め部材２３をウェブ５に挟持して、ダクト３および第１耐火被覆材２１の位置を固定する。
なお、本実施形態では、第１耐火被覆材２１の下端部側で鉄骨梁４のウェブ５と当接する部分に、スペーサピン２５およびケイカルスペーサ２６を取り付けていて、このスペーサピン２５およびケイカルスペーサ２６によって第１耐火被覆材２１およびダクト３が下方へずれることを防止している。 Subsequently, the duct 3 around which the first fireproof covering material 21 is wound is inserted into the duct through-hole 6. At this time, the outer peripheral surface 21a of the first fireproof covering material 21 and the inner peripheral surface 6a of the duct through-hole 6 abut. And the steady member 23 fixed to the 1st fireproof covering material 21 is pinched | interposed into the web 5, and the position of the duct 3 and the 1st fireproof covering material 21 is fixed.
In this embodiment, the spacer pin 25 and the calcium spacer 26 are attached to the portion of the first fireproof covering material 21 that contacts the web 5 of the steel beam 4 on the lower end side, and the spacer pin 25 and the calcium spacer 26 are attached. This prevents the first fireproof covering material 21 and the duct 3 from shifting downward.

続いて、第１耐火被覆材２１の外周面２１ａに第２耐火被覆材２２を取り付ける。
このとき、第２耐火被覆材２２の２つの第２耐火被覆材分割体２４，２４をウェブ５の両側に位置するように配し、第２耐火被覆材分割体２４，２４の内周面を第１耐火被覆材２１の外周面２１ａに当接させるとともに、第２耐火被覆材分割体２４，２４の端部２４ａ，２４ａをそれぞれウェブ５に当接させる。 Subsequently, the second fireproof coating material 22 is attached to the outer peripheral surface 21 a of the first fireproof coating material 21.
At this time, the two second fireproof coating material divisions 24, 24 of the second fireproof coating material 22 are arranged so as to be positioned on both sides of the web 5, and the inner peripheral surfaces of the second fireproof coating material divisions 24, 24 are arranged. While making it contact | abut to the outer peripheral surface 21a of the 1st fireproof covering material 21, the edge parts 24a and 24a of the 2nd fireproof covering material division body 24 and 24 are contact | abutted to the web 5, respectively.

続いて、鉄骨梁４を覆うように耐火被覆材８を取り付ける。
このとき、鉄骨梁４の耐火被覆材８は、第１耐火被覆材２１の両端部２１ｂ，２１ｂおよび第２耐火被覆材分割体２４の端部２４ｂ，２４ｂに当接するように配するとともに、ダクト３の端部側の外周面３ａに当接するように配する。
以上のようにして本実施形態の鉄骨梁のダクト貫通部の耐火被覆構造１Ａが施工される。 Subsequently, a fireproof covering material 8 is attached so as to cover the steel beam 4.
At this time, the fireproof covering material 8 of the steel beam 4 is disposed so as to contact both end portions 21b, 21b of the first fireproof covering material 21 and end portions 24b, 24b of the second fireproof covering material divided body 24, and the duct. 3 is arranged so as to be in contact with the outer peripheral surface 3a on the end side.
As described above, the fireproof covering structure 1A for the duct penetration portion of the steel beam of the present embodiment is constructed.

次に、上述した鉄骨梁のダクト貫通部の耐火被覆構造１Ａの効果について図面を用いて説明する。
本実施形態による鉄骨梁のダクト貫通部の耐火被覆構造１Ａによれば、鉄骨梁４のウェブ５に形成するダクト貫通孔６の内径φ１を、ダクト３の外径φ２に第１耐火被覆材２１の厚さｔ１を加えた寸法とすればよいため、図４に示すようなダクト貫通孔６の内径をダクト３の外径φ１に耐火被覆材２全体の厚さｔ３（図１のｔ１＋ｔ２に相当）を加えた寸法とする従来の耐火被覆構造４１よりも、ダクト貫通孔６の大きさを小さくすることができる。
このため、従来のように鉄骨梁４の梁成を大きくしたり、鉄骨梁４のウェブ５に多くのダクト３を挿通させたりする必要がないため、コストの低減と工期短縮を図ることができる。 Next, the effect of the fireproof covering structure 1 </ b> A for the duct penetration portion of the steel beam will be described with reference to the drawings.
According to the fireproof covering structure 1A for the duct penetration portion of the steel beam according to the present embodiment, the inner diameter φ1 of the duct through-hole 6 formed in the web 5 of the steel beam 4 is set to the outer diameter φ2 of the duct 3 and the first fireproof coating material 21. Therefore, the inner diameter of the duct through-hole 6 as shown in FIG. 4 is set to the outer diameter φ1 of the duct 3, and the total thickness t3 of the fireproof covering material 2 (corresponding to t1 + t2 in FIG. 1). ), The size of the duct through-hole 6 can be made smaller than that of the conventional fireproof covering structure 41 having a dimension to which) is added.
For this reason, since it is not necessary to enlarge the beam formation of the steel beam 4 or to insert many ducts 3 into the web 5 of the steel beam 4 as in the prior art, it is possible to reduce the cost and the construction period. .

また、鉄骨梁４の梁成が最小限で設計されていて、ダクト貫通孔６の大きさを大きくすることができない場合、鉄骨梁４の梁成を大きくすると建物の階高も高くなり、建築確認申請や材料の変更が生じて手間がかかるため、鉄骨梁４の梁成が最小限で設計されている場合に特に有効な耐火被覆構造とすることができる。   In addition, when the beam formation of the steel beam 4 is designed to be minimal and the size of the duct through-hole 6 cannot be increased, if the beam formation of the steel beam 4 is increased, the floor height of the building is also increased. Since a confirmation application and a change of material occur, it takes time, so that a fire-resistant covering structure that is particularly effective when the beam construction of the steel beam 4 is designed to be minimal can be achieved.

（第２実施形態）
次に、第２実施形態について、添付図面に基づいて説明するが、上述の第１実施形態と同一又は同様な部材、部分には同一の符号を用いて説明を省略し、第１実施形態と異なる構成について説明する。
図３に示すように、第２実施形態による鉄骨梁のダクト貫通部の耐火被覆構造１Ｂでは、２時間耐火の国土交通大臣認定の耐火性能を確保可能なものとし、第１耐火被覆材３１および第２耐火被覆材３２が同じ材料で形成されている。本実施形態では、第１耐火被覆材３１および第２耐火被覆材３２は、ともに厚さ２０ｍｍのロックウールのシートとしている。 (Second Embodiment)
Next, the second embodiment will be described with reference to the accompanying drawings. However, the same or similar members and parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. A different configuration will be described.
As shown in FIG. 3, the fireproof covering structure 1B of the duct penetration portion of the steel beam according to the second embodiment can ensure the fireproof performance approved by the Minister of Land, Infrastructure, Transport and Tourism for 2 hours, and the first fireproof covering 31 and The second fireproof covering material 32 is formed of the same material. In the present embodiment, the first fireproof covering material 31 and the second fireproof covering material 32 are both rock wool sheets having a thickness of 20 mm.

第２実施形態による鉄骨梁のダクト貫通部の耐火被覆構造１Ｂでは、第１実施形態と同様の効果を奏するとともに、第１耐火被覆材３１がロックウールのシートであることにより、第１耐火被覆材にセラミックファイバーのシートを使用する場合と比べてコスト削減を図ることができる。   In the fireproof covering structure 1B of the duct penetration part of the steel beam according to the second embodiment, the first fireproof covering 31 has the same effect as the first embodiment and the first fireproof covering 31 is a rock wool sheet. Cost can be reduced compared to the case of using a ceramic fiber sheet as the material.

以上、本発明による鉄骨梁のダクト貫通部の耐火被覆構造１Ａ，１Ｂの実施形態について説明したが、本発明は上記の実施形態に限定されるものではなく、その趣旨を逸脱しない範囲で適宜変更可能である。
例えば、上述した実施形態では、耐火被覆材２がロックウールやセラミックファイバーで形成されているが、所望の性能を確保できるのであればこれ以外の材料で形成されていてもよい。 As mentioned above, although embodiment of fireproof covering structure 1A, 1B of the duct penetration part of the steel beam by this invention was described, this invention is not limited to said embodiment, It changes suitably in the range which does not deviate from the meaning. Is possible.
For example, in the embodiment described above, the fireproof covering material 2 is formed of rock wool or ceramic fiber, but may be formed of other materials as long as desired performance can be ensured.

１Ａ，１Ｂ 鉄骨梁のダクト貫通部の耐火被覆構造
２ 耐火被覆材
３ ダクト
３ａ 外周面
４ 鉄骨梁
５ ウェブ
６ ダクト貫通孔
７ 床スラブ
８ 耐火被覆材
２１，３１ 第１耐火被覆材
２２，３２ 第２耐火被覆材
２３ 振れ止め部材
２４ 第２耐火被覆材分割体
２５ スペーサピン
２６ ケイカルスペーサ
DESCRIPTION OF SYMBOLS 1A, 1B Fireproof coating structure of duct penetration part of steel beam 2 Fireproof coating material 3 Duct 3a Outer peripheral surface 4 Steel beam 5 Web 6 Duct through-hole 7 Floor slab 8 Fireproof coating material 21,31 1st fireproof coating material 22,32 1st 2 Fireproof covering material 23 Stabilizing member 24 Second fireproof covering material divided body 25 Spacer pin 26 Keical spacer

Claims (3)

外周面に耐火被覆材が巻き付けられたダクトが、鉄骨梁のウェブに形成されたダクト貫通孔に挿通された鉄骨梁のダクト貫通部の耐火被覆構造において、
前記耐火被覆材は、少なくとも前記ダクト貫通孔の内周面と前記ダクトの外周面との間に配された部分の厚さ寸法が、その他の部分の厚さ寸法よりも小さく形成されていることを特徴とする鉄骨梁のダクト貫通部の耐火被覆構造。 In the fire-resistant covering structure of the duct penetration part of the steel beam inserted into the duct through-hole formed in the web of the steel beam, the duct with the fire-resistant coating material wound around the outer peripheral surface,
The fireproof covering material is formed so that at least the thickness dimension of the portion disposed between the inner peripheral surface of the duct through-hole and the outer peripheral surface of the duct is smaller than the thickness dimension of the other portions. A fireproof covering structure for duct penetrations of steel beams. 前記耐火被覆材は、前記ダクトの外周面に巻き付けられた第１耐火被覆材と、該第１耐火被覆材の外周面に巻き付けられた第２耐火被覆材と、を備え、
前記第１耐火被覆材は、前記ダクト貫通孔に挿通されるとともに、該ダクト貫通孔から前記ダクトの軸方向前後の所定範囲に巻き付けられ、
前記第２耐火被覆材は、前記ダクト貫通孔に挿通されず、前記所定範囲のみに巻き付けられていることをを特徴とする請求項１に記載の鉄骨梁のダクト貫通部の耐火被覆構造。 The fireproof coating material includes a first fireproof coating material wound around the outer peripheral surface of the duct, and a second fireproof coating material wound around the outer peripheral surface of the first fireproof coating material,
The first fireproof covering material is inserted into the duct through-hole and wound around a predetermined range in the axial direction of the duct from the duct through-hole,
2. The fireproof covering structure for a duct penetration part of a steel beam according to claim 1, wherein the second fireproof covering material is not inserted into the duct through-hole and is wound only in the predetermined range. 前記第１耐火被覆材は、セラミックファイバーまたはロックウールを材料として形成され、
前記第２耐火被覆材は、ロックウールを材料として形成されていることを特徴とする請求項２に記載の鉄骨梁のダクト貫通部の耐火被覆構造。

The first fireproof covering material is formed using ceramic fiber or rock wool as a material,
The fireproof covering structure for a duct penetration part of a steel beam according to claim 2, wherein the second fireproof covering material is made of rock wool.

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JP2015036489A (en) * 2013-08-13 2015-02-23 大和ハウス工業株式会社 Fire resistive covering structure at penetration part of shaped steel joist
JP2017089290A (en) * 2015-11-12 2017-05-25 株式会社竹中工務店 Fire resistive covering structure and fire resistive covering method
JP2018091134A (en) * 2018-02-21 2018-06-14 ニチアス株式会社 Fire resistive covering structure of piping insertion part on steel beam
JP2022107257A (en) * 2021-01-08 2022-07-21 パイロン株式会社 Fireproof coating method and steel beam

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JP2015036489A (en) * 2013-08-13 2015-02-23 大和ハウス工業株式会社 Fire resistive covering structure at penetration part of shaped steel joist
JP2017089290A (en) * 2015-11-12 2017-05-25 株式会社竹中工務店 Fire resistive covering structure and fire resistive covering method
JP2018091134A (en) * 2018-02-21 2018-06-14 ニチアス株式会社 Fire resistive covering structure of piping insertion part on steel beam
JP2022107257A (en) * 2021-01-08 2022-07-21 パイロン株式会社 Fireproof coating method and steel beam
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