JP4082687B2 - Steel beam fireproof coating structure - Google Patents

Steel beam fireproof coating structure Download PDF

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JP4082687B2
JP4082687B2 JP2003417866A JP2003417866A JP4082687B2 JP 4082687 B2 JP4082687 B2 JP 4082687B2 JP 2003417866 A JP2003417866 A JP 2003417866A JP 2003417866 A JP2003417866 A JP 2003417866A JP 4082687 B2 JP4082687 B2 JP 4082687B2
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steel beam
upper flange
fireproof
refractory
steel
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JP2005179903A (en
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秀人 齋藤
真一 坂本
寧俊 立石
辰巳 堀江
雅彦 常谷
巌 平島
玄宏 清水
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Nichias Corp
Shimizu Corp
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Shimizu Corp
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Description

本発明は、両端が支持され、上部フランジ面に構造物が取り付けられるＨ形断面の鉄骨梁の耐火被覆技術に関するものである。   The present invention relates to a fireproof coating technique for a steel beam having an H-shaped cross section in which both ends are supported and a structure is attached to an upper flange surface.

これまで、火災時における鉄骨建築の安全を保障するために、鉄骨の耐火被覆技術が種々開発されてきた。Ｈ形断面の鉄骨梁の耐火被覆としては、例えば本願出願人による特許文献１がある。特許文献１は、耐火材を鉄骨（Ｈ形梁鉄骨）に巻き付け、ピンやスタッドボルト等の掛止め部材で止める工法を開示している。ここでの耐火材による被覆は、空間に表出する全ての鉄骨面を被覆することで、鉄骨の温度上昇を抑制して鉄骨の耐火性を保持させるものである（特許文献１第１図参照）。   Up to now, various fireproof coating technologies for steel frames have been developed in order to ensure the safety of steel buildings in the event of a fire. As a fireproof coating for a steel beam having an H-shaped cross section, for example, there is Patent Document 1 by the present applicant. Patent Document 1 discloses a construction method in which a refractory material is wound around a steel frame (H-beam steel frame) and stopped with a latch member such as a pin or stud bolt. The coating with the refractory material here covers all steel surfaces exposed in the space, thereby suppressing the temperature rise of the steel frame and maintaining the fire resistance of the steel frame (see FIG. 1 of Patent Document 1). ).

一方、特許文献２には、同じ鉄骨（Ｈ形梁鉄骨）を部分的に被覆する技術が開示されている。その目的は、鉄骨の耐火被覆面積を削減し、作業効率の向上を図り、コストダウンを可能とするものである。   On the other hand, Patent Document 2 discloses a technique for partially covering the same steel frame (H-shaped beam steel frame). The purpose is to reduce the fireproof covering area of the steel frame, improve work efficiency, and enable cost reduction.

特公平６−０７２４６５号公報Japanese Patent Publication No. 6-072465 特開平８−１４４３９３号公報JP-A-8-144393

確かに、特許文献２のように、鉄骨を部分的に被覆することで、一見して作業の効率化・コストダウンを図れるように思われる。
しかし、特許文献２の発明には、次のような問題点がある。
（１）特許文献２では、吹付け工法によって耐火被覆材の部分的な被覆を行っているが（特許文献２段落番号０００９）、この吹付け工法による部分被覆では、耐火被覆材の脱落という危険がある。
（２）すなわち、吹付け用耐火被覆材は鉄骨との接着性が弱いために、部分的な被覆は困難である。これまでは、鉄骨全周を被覆することで、耐火被覆材全体が鉄骨に係合していたために、脱落の心配がなかったのである。しかし、部分的な被覆になると、係合部材等を用いない限り耐火被覆材の脱落という問題を解消できない。
（３）とくに、下部フランジ（特許文献２図１の１ｃに相当）のエッジ面を残して、下部フランジ面に耐火被覆材を被覆した場合（同２ｃに相当）、耐火被覆材の脱落の危険性が最も高い。その一方で、火災の際に通常鉄骨は下方から熱を受ける。従って、下部フランジ面は最も熱を受けやすく、この部分の露出の危険性は耐火上問題がある。 Certainly, as shown in Patent Document 2, it seems that by partially covering the steel frame, work efficiency and cost reduction can be achieved at a glance.
However, the invention of Patent Document 2 has the following problems.
(1) In Patent Document 2, partial coating of the fireproof coating material is performed by the spraying method (Patent Document 2, paragraph number 0009), but in the partial coating by this spraying method, the risk of dropping off the fireproof coating material There is.
(2) That is, since the fireproof coating material for spraying has low adhesiveness with a steel frame, partial coating is difficult. Until now, the entire circumference of the steel frame was covered, and the entire fireproof coating material was engaged with the steel frame, so there was no fear of dropping off. However, when it is partially covered, the problem of falling off the fireproof covering cannot be solved unless an engagement member or the like is used.
(3) In particular, if the lower flange surface is covered with a fireproof coating material (corresponding to 2c), leaving the edge surface of the lower flange (corresponding to 1c in Patent Document 2 FIG. 1), the risk of falling off of the fireproof coating material Most likely. On the other hand, steel frames usually receive heat from below during a fire. Therefore, the lower flange surface is most susceptible to heat, and the risk of exposure of this part is problematic in terms of fire resistance.

そこで本発明は、Ｈ形断面の鉄骨梁の上部フランジのエッジ面を露出させた耐火被覆とすることで、鉄骨梁の耐火被覆作業性・鉄骨梁の施工性（運搬性も含む）を向上させながらも、該鉄骨梁の耐火性能を低下させることなく、さらに維持・向上させる耐火被覆構造を提供することを目的とする。   Therefore, the present invention improves the workability (including transportability) of the steel beam by providing a fireproof coating that exposes the edge surface of the upper flange of the steel beam having an H-shaped cross section. However, an object of the present invention is to provide a fireproof covering structure that can be further maintained and improved without reducing the fireproof performance of the steel beam.

ここで、上記目的を達成するために、第一の発明は、両端が支持され、上部フランジ面に構造物が取り付けられるＨ形断面の鉄骨梁の耐火被覆構造にあって、少なくとも該構造物と接する上部フランジ面と上部フランジのエッジ面とを残して耐火被覆材で被覆するとともに、該鉄骨梁と耐火被覆材との間に耐火材を介在させて積層構造としたことを特徴とする。   In order to achieve the above object, the first invention is an H-shaped steel beam fireproof covering structure in which both ends are supported and the structure is attached to the upper flange surface, and at least the structure and The laminated structure is characterized in that the upper flange surface and the edge surface of the upper flange are in contact with each other and covered with a fireproof coating material, and a fireproof material is interposed between the steel beam and the fireproof coating material.

第二の発明は、耐火被覆材が板状又はフェルト状の成形部材からなるとともに、耐火材を下部フランジ面及び／又は上部フランジ下面と耐火被覆材との間に介在させたことを特徴とする。   The second invention is characterized in that the fireproof coating material is formed of a plate-shaped or felt-shaped molded member, and the fireproof material is interposed between the lower flange surface and / or the lower surface of the upper flange and the fireproof coating material. .

本発明によれば、以下のような効果を有する。
（１）鉄骨梁と耐火被覆材との間に耐火材があることで、外部から鉄骨梁へ熱の伝わるスピードが遅くなり、加熱時の鉄骨梁の温度上昇が抑制できる。これによって、加熱時の鉄骨梁全体の強度を維持できる。
（２）加熱時の鉄骨梁の温度上昇が抑制されることで、鉄骨梁の一部露出が可能となる。
（３）とくに、通常火災時に鉄骨梁は下方から熱を受けるため、下部フランジの温度が上昇しやすい。しかし、下部フランジ面と耐火被覆材との間に耐火材を介在させることで、下部フランジの温度上昇を抑制できる。
（４）また、上部フランジのエッジ面を露出させるので、上部フランジの温度が上昇しやすくなる。しかし、上部フランジ下面と耐火被覆材との間に耐火材を介在させることで、上部フランジの温度上昇を抑制できる。
（５）耐火被覆材を板状又はフェルト状の成形部材としたことにより、上部フランジのエッジ面を露出させた部分被覆とした場合でも、耐火被覆材は鉄骨梁から脱落することなく確実に鉄骨梁を被覆できる。 The present invention has the following effects.
(1) Since there is a refractory material between the steel beam and the refractory coating material, the speed at which heat is transmitted from the outside to the steel beam is reduced, and the temperature rise of the steel beam during heating can be suppressed. Thereby, the strength of the entire steel beam during heating can be maintained.
(2) Since the temperature rise of the steel beam during heating is suppressed, a part of the steel beam can be exposed.
(3) In particular, since a steel beam receives heat from below during a normal fire, the temperature of the lower flange tends to rise. However, the temperature rise of the lower flange can be suppressed by interposing the refractory material between the lower flange surface and the refractory coating material.
(4) Since the edge surface of the upper flange is exposed, the temperature of the upper flange is likely to rise. However, the temperature rise of the upper flange can be suppressed by interposing the refractory material between the lower surface of the upper flange and the fireproof coating material.
(5) The fireproof coating material is a plate-shaped or felt-shaped molded member, so that the fireproof coating material can be reliably steel frame without falling off the steel beam even when the edge surface of the upper flange is exposed. The beam can be covered.

本発明の実施形態を図面に基づいて説明する。
図１は、第一の実施形態を示す説明用断面図である。
第一実施形態では、Ｈ形断面の鉄骨梁１０が、その両端を支持されながら、上部フランジ面１２に構造物としての天井スラブ８０が取り付けられている。そして、その鉄骨梁１０を耐火被覆材３０で被覆するものである。この時、耐火被覆材３０による鉄骨梁１０の被覆は、少なくとも天井スラブ８０と接する上部フランジ面１２と上部フランジ１１のエッジ面１３とを残して、鉄骨梁１０をフェルト状の成形部材で巻付けている。耐火被覆材３０の固定は、鉄骨梁１０の各面に対して固定ピン４０，４０，…を電気溶接することで固定される。 Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory cross-sectional view showing a first embodiment.
In the first embodiment, a ceiling slab 80 as a structure is attached to the upper flange surface 12 while the steel beam 10 having an H-shaped cross section is supported at both ends thereof. Then, the steel beam 10 is covered with the fireproof covering material 30. At this time, the steel beam 10 is covered with the fireproof covering material 30 by wrapping the steel beam 10 with a felt-shaped molding member, leaving at least the upper flange surface 12 in contact with the ceiling slab 80 and the edge surface 13 of the upper flange 11. ing. The fireproof covering 30 is fixed by electrically welding the fixing pins 40, 40,...

また、第一実施形態では、フェルト状の耐火材３６を、下部フランジ面１７と耐火被覆材３０との間に介在させ、加えて同じフェルト状の耐火材３９を、上部フランジ下面１４と耐火被覆材３０との間に介在させている。これにより、外部から鉄骨梁１０へ熱の伝わるスピードが遅くなり、火災時の鉄骨梁１０の温度上昇を抑制できる。その結果、火災時の鉄骨梁１０全体の強度を維持できる。従って、エッジ面１３を被覆しなくても、この耐火材３６，３９が介在していることで、火災時における鉄骨梁１０の温度上昇を抑制できる。   In the first embodiment, the felt-like refractory material 36 is interposed between the lower flange surface 17 and the refractory coating material 30, and the same felt-like refractory material 39 is added to the upper flange lower surface 14 and the refractory coating. It is interposed between the material 30. Thereby, the speed at which heat is transmitted from the outside to the steel beam 10 becomes slow, and the temperature rise of the steel beam 10 at the time of a fire can be suppressed. As a result, the strength of the entire steel beam 10 during a fire can be maintained. Therefore, even if the edge surface 13 is not covered, the temperature rise of the steel beam 10 during a fire can be suppressed by the presence of the refractory materials 36 and 39.

詳しくは、通常火災時に鉄骨梁１０は下方から熱を受ける。このため、熱源に最も近い下部フランジ１６の温度が上昇しやすい。しかし、下部フランジ面１７と耐火被覆材３０との間に耐火材３６を介在させることで、下部フランジ１６の温度上昇を抑制できる。
また、本発明では上部フランジ１１のエッジ面１３を露出させる部分被覆なので、上部フランジ１１の温度が上昇しやすくなる。しかし、上部フランジ下面１４と耐火被覆材３０との間に耐火材３９を介在させることで、上部フランジ１１の温度上昇も抑制できる。 Specifically, the steel beam 10 receives heat from below during a normal fire. For this reason, the temperature of the lower flange 16 closest to the heat source is likely to rise. However, the temperature rise of the lower flange 16 can be suppressed by interposing the refractory material 36 between the lower flange surface 17 and the refractory coating material 30.
Moreover, in this invention, since it is the partial coating | cover which exposes the edge surface 13 of the upper flange 11, the temperature of the upper flange 11 becomes easy to rise. However, the temperature rise of the upper flange 11 can be suppressed by interposing the refractory material 39 between the upper flange lower surface 14 and the refractory coating material 30.

ここで、フェルト状の耐火材３６，３９は板状の耐火材であっても構わない。また、その耐火材の材質としては、耐火被覆材３０と同質材であっても構わず、或いは耐火性のある異質材であっても構わない。   Here, the felt-like refractory materials 36 and 39 may be plate-like refractory materials. Further, the material of the refractory material may be the same material as the refractory coating material 30 or may be a heterogeneous material having fire resistance.

第一実施形態では、エッジ面１３を被覆しない鉄骨梁１０の耐火被覆構造としている。このことで、煩雑な作業であるエッジ面１３の被覆作業を不要にできる。また、そのような鉄骨梁１０は構造物との取り付けも簡易となり施工性も向上する。その他、鉄骨梁１０の運搬時（解体してリユースする場合を含む）に、エッジ面１３における耐火被覆材３０の破損を防止できる。   In 1st embodiment, it is set as the fireproof covering structure of the steel beam 10 which does not coat | cover the edge surface 13. FIG. This eliminates the need for the covering operation of the edge surface 13, which is a complicated operation. Further, such a steel beam 10 can be easily attached to a structure and the workability is improved. In addition, it is possible to prevent the fireproof covering material 30 from being damaged at the edge surface 13 during transportation of the steel beam 10 (including the case of dismantling and reuse).

図２は、第二の実施形態を示す説明用断面図である。
第二実施形態では、第一実施形態と耐火被覆材３３の貼り方を変更したものである。
すなわち、第一実施形態では、鉄骨梁１０と耐火被覆材３０との間を空けずに被覆していた。これに対して、第二実施形態では、上部フランジ１１と下部フランジ１６とを繋いでいるウェブ２０のウェブ面２１，２１に耐火被覆材３３を接触させずに、鉄骨梁１０を被覆している（いわゆる「箱貼り」）。この場合も、第一実施形態と同様に、耐火被覆材３３による鉄骨梁１０の被覆は、少なくとも天井スラブ８０と接する上部フランジ面１２と上部フランジ１１のエッジ面１３とを残して、鉄骨梁１０をフェルト状の成形部材で巻付けている。その他に、固定ピン４０，４０による耐火被覆材３３の固定は第一実施形態の場合と同様である。 FIG. 2 is an explanatory cross-sectional view showing a second embodiment.
In the second embodiment, the method of attaching the fireproof covering material 33 to that of the first embodiment is changed.
That is, in the first embodiment, the steel beam 10 and the fireproof coating material 30 are covered without leaving a gap. On the other hand, in the second embodiment, the steel beam 10 is covered without bringing the fireproof covering material 33 into contact with the web surfaces 21 and 21 of the web 20 connecting the upper flange 11 and the lower flange 16. (So-called “boxing”). Also in this case, as in the first embodiment, the steel beam 10 is covered with the fireproof covering material 33, leaving at least the upper flange surface 12 in contact with the ceiling slab 80 and the edge surface 13 of the upper flange 11. Is wrapped with a felt-shaped molded member. In addition, the fixing of the fireproof covering material 33 by the fixing pins 40, 40 is the same as in the first embodiment.

また、フェルト状の耐火材３６を、下部フランジ面１７と耐火被覆材３３との間に介在させ、加えて同じフェルト状の耐火材３９を、上部フランジ下面１４と耐火被覆材３３との間に介在させている。これにより、第一実施形態の場合と同様の効果を有する。   Further, a felt-like refractory material 36 is interposed between the lower flange surface 17 and the refractory coating material 33, and the same felt-like refractory material 39 is interposed between the upper flange lower surface 14 and the refractory coating material 33. Intervene. This has the same effect as the case of the first embodiment.

すなわち、下部フランジ面１７と耐火被覆材３３との間に耐火材３６を介在させることで、熱源に最も近くなる下部フランジ１６の温度上昇を抑制できる。
また、上部フランジ下面１４と耐火被覆材３３との間に耐火材３９を介在させることで、エッジ面１３の露出に伴う上部フランジ１１の温度上昇も抑制できる。
これらにより、外部から鉄骨梁１０へ熱の伝わるスピードが遅くなり、火災時の鉄骨梁１０の温度上昇を抑制できる。その結果、火災時の鉄骨梁１０全体の強度を維持できる。 That is, by interposing the refractory material 36 between the lower flange surface 17 and the refractory coating material 33, the temperature rise of the lower flange 16 closest to the heat source can be suppressed.
Further, by interposing the refractory material 39 between the upper flange lower surface 14 and the refractory coating material 33, the temperature rise of the upper flange 11 accompanying the exposure of the edge surface 13 can also be suppressed.
As a result, the speed at which heat is transmitted from the outside to the steel beam 10 becomes slow, and the temperature rise of the steel beam 10 during a fire can be suppressed. As a result, the strength of the entire steel beam 10 during a fire can be maintained.

本発明は、上部フランジ面に構造物が取り付けられるＨ形断面の鉄骨梁に利用されるものである。   The present invention is used for an H-shaped steel beam having a structure attached to the upper flange surface.

第一の実施形態を示す説明用断面図。Cross-sectional view for explanation showing the first embodiment. 第二の実施形態を示す説明用断面図。Sectional drawing for description which shows 2nd embodiment.

符号の説明Explanation of symbols

１０ 鉄骨梁
１１ 上部フランジ １２ 上部フランジ面
１３ エッジ面 １４ 上部フランジ下面
１６ 下部フランジ １７ 下部フランジ面
３０，３３ 耐火被覆材
３６，３９ 耐火材
４０ 固定ピン
８０ 天井スラブ DESCRIPTION OF SYMBOLS 10 Steel beam 11 Upper flange 12 Upper flange surface 13 Edge surface 14 Upper flange lower surface 16 Lower flange 17 Lower flange surface 30,33 Fireproof covering material 36,39 Fireproof material 40 Fixing pin 80 Ceiling slab

Claims (2)

両端が支持され、上部フランジ面に構造物が取り付けられるＨ形断面の鉄骨梁の耐火被覆構造であって、
少なくとも該構造物と接する上部フランジ面と上部フランジのエッジ面とを残して耐火被覆材で被覆するとともに、該鉄骨梁と耐火被覆材との間に耐火材を介在させて積層構造としたことを特徴とする鉄骨梁の耐火被覆構造。 A fire-resistant covering structure of a steel beam with an H-shaped cross section, with both ends supported and a structure attached to the upper flange surface,
It was coated with a refractory coating material leaving at least the upper flange surface in contact with the structure and the edge surface of the upper flange, and a laminated structure with a refractory material interposed between the steel beam and the refractory coating material. Features a fire-resistant covering structure for steel beams. 耐火被覆材が板状又はフェルト状の成形部材からなるとともに、耐火材を下部フランジ面及び／又は上部フランジ下面と耐火被覆材との間に介在させたことを特徴とする請求項１記載の鉄骨梁の耐火被覆構造。   2. The steel frame according to claim 1, wherein the fireproof covering material comprises a plate-shaped or felt-shaped molded member, and the fireproof material is interposed between the lower flange surface and / or the lower surface of the upper flange and the fireproof covering material. Fireproof covering structure for beams.
JP2003417866A 2003-12-16 2003-12-16 Steel beam fireproof coating structure Expired - Lifetime JP4082687B2 (en)

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