JP2858279B2 - Method to introduce compressive force using temperature difference to tensile flange of steel girder - Google Patents
Method to introduce compressive force using temperature difference to tensile flange of steel girderInfo
- Publication number
- JP2858279B2 JP2858279B2 JP22377091A JP22377091A JP2858279B2 JP 2858279 B2 JP2858279 B2 JP 2858279B2 JP 22377091 A JP22377091 A JP 22377091A JP 22377091 A JP22377091 A JP 22377091A JP 2858279 B2 JP2858279 B2 JP 2858279B2
- Authority
- JP
- Japan
- Prior art keywords
- flange
- reinforcing plate
- tensile
- compressive force
- tension flange
- 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.)
- Expired - Fee Related
Links
Description
【発明の詳細な説明】 ［産業上の利用分野］本発明は、鋼製の梁で引張力が作
用する引張フランジの断面積が不足している場合に、ヒ
ーターを用いて補強板を加熱し引張フランジと補強板の
間に温度差を生じさせ、ボルト・ナットで締め付けた後
にヒーターを取り除き、補強板が冷えて縮む事により引
張フランジに圧縮力を導入し引張フランジの引張応力度
を低減する工法。また、単純鋼合成桁において鉄筋コン
クリート床版の施工時に引張フランジに圧縮力を与える
事により、圧縮フランジの圧縮応力度を低減し、そして
鉄筋コンクリート床版の完成後、引張フランジの圧縮力
を取り除いても、鋼桁と鉄筋コンクリート床版の合成効
果により引張フランジに圧縮力が残り、引張フランジの
引張応力度を低減する工法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for heating a reinforcing plate using a heater when the cross-sectional area of a tensile flange on which a tensile force acts on a steel beam is insufficient. A method that creates a temperature difference between the tension flange and the reinforcing plate, removes the heater after tightening with bolts and nuts, cools and shrinks the reinforcing plate, and introduces compressive force to the tension flange to reduce the tensile stress of the tension flange. In addition, by applying a compressive force to the tension flange during the construction of the reinforced concrete slab in a simple steel composite girder, the compressive stress of the compression flange is reduced, and after the completion of the reinforced concrete slab, the compression force of the tension flange can be removed. The present invention relates to a construction method in which a compressive force remains on a tensile flange due to a combined effect of a steel girder and a reinforced concrete floor slab, and the tensile stress of the tensile flange is reduced.
［従来の技術］従来の断面積が不足している引張フラン
ジを補強する工法は、補強する鋼板を単にボルト・ナッ
トで締め付けるか、又は補強する鋼板を引張フランジに
溶接する工法であった。また、単純鋼合成桁において鉄
筋コンクリート床版の施工時に圧縮フランジの圧縮応力
度を低減する工法としては鋼桁の中央または、全体をベ
ントで支えて鉄筋コンクリート床版を施工する工法があ
った。2. Description of the Related Art Conventionally, a method of reinforcing a tensile flange having a insufficient cross-sectional area has been a method in which a steel plate to be reinforced is simply tightened with bolts and nuts or a steel plate to be reinforced is welded to the tensile flange. In addition, as a method of reducing the compressive stress of the compression flange in the construction of a reinforced concrete slab in a simple steel composite girder, there has been a method of constructing a reinforced concrete slab by supporting the center or the whole of the steel girder with a vent.
［発明が解決しようとする課題］梁には構造物の自重、
添加物の重量などの常に構造物に作用する荷重、（以
下、死荷重とする）による応力度と、そして列車、自動
車などの荷重（以下、活荷重とする）による応力度が作
用する。死荷重による応力度は、常に作用している為従
来の単に鋼板をつけた補強工法では死荷重による応力度
を低減できなかった。さらに、死荷重による応力度が許
容応力度に近い場合、従来の工法では補強は不可能であ
り梁の本数を増やすか、死荷重を低減するなどの工法を
行なった為、工事費が高額となった。また、単純鋼合成
桁において鉄筋コンクリート床版の施工時に鋼桁の中央
または、全体をベントで支えて鉄筋コンクリート床版を
施工する工法は工事費が高額となった。本発明は以上の
欠点を解決し、引張フランジに圧縮力を導入し、引張フ
ランジに作用している引張応力度を低減する工法を提供
すること目的とする。[Problems to be Solved by the Invention] The beam has its own weight,
A load such as the weight of the additive always acts on the structure, a stress caused by a dead load (hereinafter, referred to as a dead load), and a stress caused by a load (hereinafter, referred to as a live load) of a train, an automobile, or the like acts. Since the stress caused by the dead load is always acting, the stress caused by the dead load cannot be reduced by the conventional reinforcing method using a simple steel plate. Furthermore, when the stress due to the dead load is close to the allowable stress, it is impossible to reinforce with the conventional method, and construction methods such as increasing the number of beams or reducing the dead load are expensive. became. In addition, the construction method of constructing a reinforced concrete slab by supporting the center or the whole of the steel girder with a vent at the time of construction of the reinforced concrete slab in the simple steel composite girder was expensive. An object of the present invention is to solve the above-mentioned drawbacks and to provide a construction method for introducing a compressive force into a tension flange to reduce the degree of tensile stress acting on the tension flange.
［課題を解決するための手段］上記目的を達成するため
に、本発明の引張フランジに圧縮力を導入する工法にお
いては、鉄板と断熱材を引張フランジと補強板の間に挟
むように前記補強板を前記引張フランジに取り付け、ヒ
ーターにより補強板を加熱し、前記補強板と引張フラン
ジの間に温度差を生じさせた後に、ボルト・ナットで前
記補強板と前記引張フランジを締め付け、前記ヒーター
を取り除き引張フランジに圧縮力を導入する工法。[Means for Solving the Problems] In order to achieve the above object, in the method of the present invention for introducing a compressive force to a tension flange, the reinforcing plate is sandwiched between an iron plate and a heat insulating material between the tension flange and the reinforcing plate. Attach to the tension flange, heat the reinforcing plate with a heater, generate a temperature difference between the reinforcing plate and the tension flange, then tighten the reinforcing plate and the tension flange with bolts and nuts, remove the heater and pull A construction method that introduces compressive force to the flange.
［作用］上記のように構成された補強板をヒーターによ
り加熱すると、引張フランジと補強板の間の断熱材が前
記引張フランジの温度上昇を防ぎ、前記補強板と引張フ
ランジの間に温度差を生じる。温度差が生じた後に、鋼
桁の添接に用いる摩擦接合用の高力ボルト（以下、高力
ボルトとする）の様なボルト・ナッ卜で前記補強板と前
記引張フランジを締め付け、前記ヒーターを取り除く
と、補強板の温度が冷えて、引張フランジの温度と同じ
になると、補強板は温度の高い時に引張フランジに固定
された為、補強板が縮もうとするが、引張フランジによ
り縮みが拘束さる。縮みが拘束さた補強板には引張力が
生じ、その反作用として引張フランジに圧縮力が導入さ
れる。[Operation] When the reinforcing plate configured as described above is heated by the heater, the heat insulating material between the tensile flange and the reinforcing plate prevents the temperature of the tensile flange from rising, and a temperature difference is generated between the reinforcing plate and the tensile flange. After the temperature difference has occurred, the reinforcing plate and the tension flange are tightened with a bolt nut such as a high-strength bolt for friction joining (hereinafter, referred to as a high-strength bolt) used for joining a steel girder. When the temperature of the reinforcing plate cools and becomes the same as the temperature of the tension flange, the reinforcement plate is fixed to the tension flange when the temperature is high. Be restrained. A tensile force is generated in the reinforcing plate whose contraction is restricted, and a compressive force is introduced to the tensile flange as a reaction of the tensile force.
［実施例］実施例について図面を参照して説明する、第
１図において、補強板（２）の端部に高力ボルトの様な
ボルト・ナット（５）を取り付けるための穴をあける、
穴の形状は一方の端部は円形とし、もう一方の端部は長
円形とした補強板また、穴の形状は両方の端部を長円形
としてよい。第２図及び第３図において、鉄板（３、
４）と断熱材（６）を引張フランジ（１）と補強板
（２）の間に挟むように前記補強板（２）を前記引張フ
ランジに取り付ける、この時、ボルト・ナット（５）は
取り付けるだけで、強く締め付けない、そして補強板
（２）を電熱機のようなヒーター（７）で５０℃〜２０
０℃に加熱する。補強板（２）と引張フランジ（１）の
間に断熱材（６）がある為、該引張フランジ（１）の温
度は上昇せず、補強板（２）と引張フランジ（１）の間
に温度差が生じる。また補強板（２）を加熱する方法と
してはガスバナーなどで加熱してよい。第４図におい
て、補強板（２）と引張フランジ（１）の間に温度差が
生じた後に、ボルト・ナット（５）を強く締め付けるこ
とにより、前記補強板（２）と前記引張フランジ（１）
が一体となる、ヒーター（７）を取り除くと補強板
（２）の温度が冷えて、引張フランジ（１）の温度と同
じになる、補強板（２）は温度の高い時に引張フランジ
（１）に固定された為、補強板（２）は縮もうとする
が、引張フランジ（１）により縮みが拘束されているた
め補強板（２）には引張力が生じ、その反作用として引
張フランジ（１）に圧縮力が導入される。[Embodiment] An embodiment will be described with reference to the drawings. In FIG. 1, a hole for attaching a bolt / nut (5) such as a high-strength bolt is drilled at an end of a reinforcing plate (2).
The shape of the hole may be a reinforcing plate having one end having a circular shape and the other end having an oval shape. The shape of the hole may have both ends having an oval shape. 2 and 3, the iron plate (3,
4) and the heat insulating material (6) is attached to the tension flange so that the reinforcement plate (2) is sandwiched between the tension flange (1) and the reinforcement plate (2). At this time, the bolts and nuts (5) are attached. Only, do not strongly tighten, and the reinforcing plate (2) is heated at 50 ° C. to 20 ° C. with a heater (7) such as an electric heater.
Heat to 0 ° C. Since there is a heat insulating material (6) between the reinforcing plate (2) and the tension flange (1), the temperature of the tension flange (1) does not rise, and the temperature between the reinforcement plate (2) and the tension flange (1) is increased. A temperature difference occurs. The reinforcing plate (2) may be heated by a gas banner or the like. In FIG. 4, after a temperature difference has occurred between the reinforcing plate (2) and the tension flange (1), the bolts and nuts (5) are strongly tightened, whereby the reinforcing plate (2) and the tension flange (1) are tightened. )
When the heater (7) is removed, the temperature of the reinforcing plate (2) cools and becomes the same as the temperature of the tension flange (1). When the temperature of the reinforcing plate (2) is high, the tension flange (1) is removed. , The reinforcing plate (2) tries to shrink, but since the shrinkage is restricted by the tensile flange (1), a tensile force is generated in the reinforcing plate (2). ) Introduces a compressive force.
［発明の効果］本発明は、以上説明したように構成され
ているので、以下に記載されるような効果を奏する。断
面積が不足している引張フランジに、補強板と引張フラ
ンジの間に温度差を利用して、引張フランジに圧縮力が
導入することにより、断面積の不足している引張フラン
ジの引張応力度を低減し、引張フランジと補強板が一体
となって外力に抵抗するため、効率の良い工法である。
また、引張フランジの死荷重による引張応力度が許容応
力度に近い場合、従来の補強工法では不可能であった
が、本発明の工法により補強が可能となった。また、単
純鋼合成桁において鉄筋コンクリート床版の施工時に引
張フランジに圧縮力を与える事により、圧縮フランジの
圧縮応力度を低減し、そして鉄筋コンクリート床版の完
成後、引張フランジの圧縮力を取り除いても、鋼桁と鉄
筋コンクリート床版の合成効果により引張フランジに圧
縮力が残り、引張フランジの引張応力度を低減できる。[Effects of the Invention] Since the present invention is configured as described above, it has the following effects. By applying a compressive force to the tension flange using the temperature difference between the reinforcing plate and the tension flange to the tension flange with a small cross-sectional area, the tensile stress of the tension flange with a small cross-sectional area is reduced. This is an efficient method because the tension flange and the reinforcing plate are integrated to resist external force.
Further, when the tensile stress due to the dead load of the tensile flange is close to the allowable stress, it was impossible with the conventional reinforcing method, but the reinforcing method according to the present invention became possible. In addition, by applying a compressive force to the tension flange during the construction of the reinforced concrete slab in a simple steel composite girder, the compressive stress of the compression flange is reduced, and after the completion of the reinforced concrete slab, the compression force of the tension flange can be removed. Due to the combined effect of the steel girder and the reinforced concrete slab, the compressive force remains on the tensile flange, and the tensile stress of the tensile flange can be reduced.
第１図は補強板にボルト・ナットを取り付けるための穴
をあけた平面図、第２図は補強板をヒーターで加熱して
いる斜視図、第３図は第２図の断面図、第４図はヒータ
ーを撤去し引張フランジに圧縮力を導入されるところの
断面図、 １………引張フランジ ２………補強板 ３、４ …………鉄板 ５………ボルト・ナット ６………断熱材 ７………ヒーターFIG. 1 is a plan view with holes for attaching bolts and nuts to the reinforcing plate, FIG. 2 is a perspective view in which the reinforcing plate is heated by a heater, FIG. 3 is a cross-sectional view of FIG. The figure is a cross-sectional view where the heater is removed and a compressive force is introduced into the tension flange. 1... Tension flange 2... Reinforcing plate 3, 4... Iron plate 5... Bolt and nut 6. … Insulation material 7 ……… Heater
Claims (1)
ンジ（１）と補強板（２）の間に挟むように前記補強板
（２）を前記引張フランジ（１）に取り付ける、ヒータ
ー（７）により補強板（２）を加熱し、前記補強板
（２）と引張フランジ（１）の間に温度差を生じさせた
後に、ボルト・ナッ卜（５）で前記補強板（２）と前記
引張フランジ（１）を締め付け、前記ヒーター（７）を
取り除き引張フランジ（１）に圧縮力を導入する工法1. The reinforcing plate (2) is attached to the tension flange (1) such that the iron plate (3, 4) and the heat insulating material (6) are sandwiched between the tension flange (1) and the reinforcement plate (2). The reinforcing plate (2) is heated by a heater (7) to generate a temperature difference between the reinforcing plate (2) and the tension flange (1), and then the reinforcing plate (2) is bolted with a nut (5). 2) Tighten the tension flange (1) and remove the heater (7) to introduce a compressive force to the tension flange (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22377091A JP2858279B2 (en) | 1991-05-27 | 1991-05-27 | Method to introduce compressive force using temperature difference to tensile flange of steel girder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22377091A JP2858279B2 (en) | 1991-05-27 | 1991-05-27 | Method to introduce compressive force using temperature difference to tensile flange of steel girder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09100513A JPH09100513A (en) | 1997-04-15 |
| JP2858279B2 true JP2858279B2 (en) | 1999-02-17 |
Family
ID=16803440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22377091A Expired - Fee Related JP2858279B2 (en) | 1991-05-27 | 1991-05-27 | Method to introduce compressive force using temperature difference to tensile flange of steel girder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2858279B2 (en) |
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- 1991-05-27 JP JP22377091A patent/JP2858279B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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Also Published As
| Publication number | Publication date |
|---|---|
| JPH09100513A (en) | 1997-04-15 |
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