JP2006224138A - Corner joint structure and corner joint method of bridge support - Google Patents

Corner joint structure and corner joint method of bridge support Download PDF

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JP2006224138A
JP2006224138A JP2005040795A JP2005040795A JP2006224138A JP 2006224138 A JP2006224138 A JP 2006224138A JP 2005040795 A JP2005040795 A JP 2005040795A JP 2005040795 A JP2005040795 A JP 2005040795A JP 2006224138 A JP2006224138 A JP 2006224138A
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thick steel
corner joint
welding
groove
steel plate
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JP4530154B2 (en
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Kotaro Inose
幸太郎 猪瀬
Hiroto Yamaoka
弘人 山岡
Isao Kawaguchi
勲 川口
Yasumasa Nakanishi
保正 中西
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IHI Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide the corner joint structure of a bridge support capable of ensuring high earthquake-proof performance while suppressing residual stresses, thermal deformation or the like, saving labor of welding work and reducing welding materials, and to provide the corner joint method of a bridge support. <P>SOLUTION: A groove 22 is formed in the end face 20 of one thick steel plate 10a out of thick steel plates 10a, 10b adjacent to each other constituting the corner joint structure of a bridge support. The root portion 24 of the groove 22 is subjected to laser beam welding, and expanded portions 26, 28 are subjected to the arc welding to charge a weld metal 40 therein. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、橋脚の角継手構造及び角継手工法に係り、詳しくは、厚板鋼板の端縁同士を溶接により接合して角継手を構成し鋼製橋脚を製造する技術に関する。   The present invention relates to a corner joint structure and a corner joint construction method for a pier, and more particularly to a technique for manufacturing a steel pier by constructing a corner joint by joining edges of thick steel plates by welding.

橋梁や高架道路等の橋脚としてコンクリート材等の種々の材料のものが考えられており、その一つとして鋼製橋脚がある。
鋼製橋脚は、一般には、厚板鋼板の端縁同士を溶接により接合するようにして角継手を構成し、断面矩形（例えば、四角形）の閉断面構造を形成するように製造される。
そして、角継手を構成すべく厚板鋼板の端縁同士を溶接する場合には、溶接が容易である等の理由からアーク溶接（ＳＡＷ、ＳＭＡＷ、ＧＭＡＷ等）が多用されている。 Various materials such as concrete materials are considered as piers for bridges and elevated roads, and one of them is a steel pier.
Steel piers are generally manufactured so as to form square joints by joining the edges of thick steel plates by welding to form a closed cross-sectional structure with a rectangular cross section (for example, a quadrangle).
When welding the edges of thick steel plates to form a corner joint, arc welding (SAW, SMAW, GMAW, etc.) is frequently used for reasons such as easy welding.

ところで、このように角継手にアーク溶接を用いる場合、一方の厚板鋼板の端縁に開先を形成し、当該開先の拡開部に溶接金属盛を形成するのが一般的である。そして、当該開先を形成する場合には、ルート部についてはアーク溶接を施せないため、一部溶接されない部分（溶け残り部）が生じ、角継手が部分溶込み継手となる。しかしながら、このような部分溶込み継手であっても、角継手部分については剛性及び強度を確保する必要があり、研究の結果、当該ルート部の板厚方向の寸法を例えば厚板鋼板の板厚の１／４以下にして拡開部の寸法を十分に確保するのがよいことが知られている（非特許文献１参照）。   By the way, when arc welding is used for the corner joint in this way, it is common to form a groove on the edge of one of the thick steel plates and form a weld metal bank on the widened portion of the groove. And when forming the said groove | channel, since arc welding cannot be performed about a root | route part, the part which is not welded partially (dissolved part) arises, and a corner joint turns into a partial penetration joint. However, even in such a partially-penetrated joint, it is necessary to ensure rigidity and strength for the corner joint part. As a result of research, the dimension in the plate thickness direction of the route part is, for example, the plate thickness of a thick steel plate. It is known that the size of the expanded portion should be sufficiently ensured by 1/4 or less (see Non-Patent Document 1).

一方において、最近では金属部材をレーザー光で加熱溶融させて溶接を行うレーザー溶接（ＬＢＷ）が開発され実用化されつつあり、例えば、金属部材のＹ型開先にアーク溶接とともにレーザー溶接を施工するような溶接方法が公知である（特許文献１）。
溶接学会全国大会講演概要第７２集ＰＰ２５０−２５１「塑性化を許容する鋼構造体の角継手強度に関する研究」（２００３年３月２４日発行） 特開平６−１１４５８７号公報 On the other hand, recently, laser welding (LBW), in which a metal member is heated and melted with a laser beam to perform welding, has been developed and put into practical use. For example, laser welding is applied to a Y-shaped groove of a metal member together with arc welding. Such a welding method is known (Patent Document 1).
72nd Annual Meeting of the Japan Welding Society Annual Meeting PP250-251 “Study on the strength of corner joints in steel structures that allow plasticization” (issued March 24, 2003) JP-A-6-114587

ところで、アーク溶接では、上記非特許文献１に示されるようにルート部の板厚方向の寸法を板厚の１／４以下にして拡開部の寸法を十分に確保したような場合、特に角継手を完全溶込み継手にしようとした場合には、角継手部分の剛性及び強度が確保される一方、溶接作業量が多く、コスト高になり、また、開先の拡開部を大きくするが故に溶接金属の量が多くなり、これにより熱収縮量が増大して残留応力が大きくなり、或いは、過大な入熱により熱変形が増大するという問題がある。   By the way, in arc welding, as shown in Non-Patent Document 1 above, when the dimension of the root part in the thickness direction is ¼ or less of the board thickness and the dimension of the expanded part is sufficiently secured, especially the corners. When trying to make the joint a fully-penetrated joint, the rigidity and strength of the corner joint part are ensured, but the amount of welding work is increased, the cost is increased, and the groove expanding portion is enlarged. Therefore, there is a problem that the amount of weld metal is increased, thereby increasing the amount of thermal shrinkage and increasing the residual stress, or increasing thermal deformation due to excessive heat input.

さらに、角継手を溶け残り部が生じる部分溶込み継手で構成する場合にあっては、通常の荷重を支持することはできても、耐震性能を十分に確保できないという問題もある。
また一方、上記特許文献１に開示される溶接方法は、板部材の突き当て接合にレーザー溶接とアーク溶接を施工するようにしたものである。具体的には、特許文献１に開示される溶接方法では、Ｙ型開先のルート部については板部材のルート部側（裏側）からレーザー溶接を行うとともに、拡開部については板部材の拡開部側（表側）からアーク溶接を行うようにしている。 Furthermore, in the case where the corner joint is constituted by a partially-penetrated joint in which an unmelted portion is generated, there is a problem that sufficient seismic performance cannot be ensured even though a normal load can be supported.
On the other hand, the welding method disclosed in Patent Document 1 is such that laser welding and arc welding are applied to the butt joint of the plate members. Specifically, in the welding method disclosed in Patent Document 1, laser welding is performed from the root side (back side) of the plate member for the root portion of the Y-shaped groove, and the plate member is expanded for the spread portion. Arc welding is performed from the open side (front side).

しかしながら、上記のような鋼製橋脚の角継手にあっては、溶接部位が単純な突き当て溶接ではないため、当該特許文献１に開示の溶接方法をそのまま適用することはできない。
また、特許文献１に開示の技術は、主として形状精度を向上させることを目的としたものであり、上記課題を解決するものではない。 However, in the above-described angular joint of a steel bridge pier, the welding method disclosed in Patent Document 1 cannot be applied as it is because the welding site is not simple butted welding.
Moreover, the technique disclosed in Patent Document 1 is mainly intended to improve the shape accuracy, and does not solve the above problem.

本発明はこのような問題点を解決するためになされたもので、その目的とするところは、残留応力や熱変形等の抑制、溶接作業の省力化及び溶接材料の削減を図りながら高い耐震性能を確保可能な橋脚の角継手構造及び角継手工法を提供することにある。   The present invention has been made in order to solve such problems, and the purpose of the present invention is to provide high earthquake resistance while suppressing residual stress and thermal deformation, saving labor in welding work, and reducing welding materials. It is an object of the present invention to provide a corner joint structure and a corner joint construction method for a bridge pier capable of ensuring the above.

上記した目的を達成するために、請求項１の橋脚の角継手構造では、隣り合う厚板鋼板のうち一方の厚板鋼板の端面を他方の厚板鋼板の端縁側面に溶接して構成される橋脚の角継手構造であって、前記一方の厚板鋼板の端面に開先が形成され、該開先のルート部にレーザー溶接が施工されるとともに、拡開部にアーク溶接が施工されて溶接金属が装填されてなることを特徴とする。   In order to achieve the above-described object, the corner joint structure of a bridge pier according to claim 1 is configured by welding an end face of one thick steel plate to an edge side surface of the other thick steel plate among adjacent thick steel plates. The pier corner joint structure has a groove formed on the end face of the one thick steel plate, laser welding is applied to the root portion of the groove, and arc welding is applied to the expanded portion. It is characterized by being loaded with a weld metal.

即ち、厚板鋼板を溶接して構成される橋脚の角継手を完全溶込み継手にしようとすると、アーク溶接だけでは、開先の拡開部の増大により溶接金属の使用量が増加し、溶接金属の熱収縮により厚板鋼板内に大きな残留応力が発生したり、或いは入熱が大きくなるために厚板鋼板が熱変形したりするのであるが、開先のルート部をレーザー溶接により溶接することで、溶接金属の使用量が必要最小限に抑えられて残留応力の発生が抑制され、入熱が少なくされて厚板鋼板の熱変形が抑制される。これにより、開先の拡開部を増大させることなく或いは入熱を大きくすることなく完全溶込み継手が容易に実現され、角継手の剛性及び強度が確保される。   In other words, when attempting to make a pier corner joint made by welding thick steel plates into a fully-penetrated joint, arc welding alone increases the amount of weld metal used due to an increase in the widened portion of the groove, and welding Large residual stress is generated in the steel plate due to heat shrinkage of the metal, or the steel plate is thermally deformed due to increased heat input, but the root part of the groove is welded by laser welding. Thus, the usage amount of the weld metal is suppressed to the necessary minimum, the occurrence of residual stress is suppressed, the heat input is reduced, and the thermal deformation of the thick steel plate is suppressed. As a result, a complete penetration joint can be easily realized without increasing the expanding portion of the groove or increasing the heat input, and the rigidity and strength of the corner joint are ensured.

また、請求項２の橋脚の角継手構造では、請求項１において、前記開先はＶ型開先であることを特徴とする。
即ち、厚板鋼板の板厚が厚いような場合において、開先を振り分けることで開先の拡開部が極力小さくなり、アーク溶接による残留応力の発生や厚板鋼板の熱変形が良好に抑制される。 The corner joint structure of a pier according to claim 2 is characterized in that, in claim 1, the groove is a V-shaped groove.
In other words, when the plate thickness of the thick steel plate is large, the spread of the groove becomes as small as possible by allocating the groove, and generation of residual stress due to arc welding and thermal deformation of the thick steel plate are well suppressed. Is done.

また、請求項３の橋脚の角継手構造では、請求項１において、前記開先は橋脚の外方側に拡開するレ型またはＪ型開先であることを特徴とする。
即ち、厚板鋼板の板厚が比較的薄いような場合において、アーク溶接による残留応力の発生や厚板鋼板の熱変形が抑制されつつ、橋脚の外側からだけで溶接作業が完了し、溶接作業性が向上する。 According to a corner joint structure of a bridge pier according to a third aspect of the present invention, in the first aspect of the present invention, the groove is a la-type or a J-shaped groove that expands outward of the pier.
That is, in the case where the plate thickness of the steel plate is relatively thin, the welding work is completed only from the outside of the pier while the residual stress due to arc welding and the thermal deformation of the steel plate are suppressed, and the welding operation is completed. Improves.

また、請求項４の橋脚の角継手構造では、請求項１乃至３のいずれかにおいて、前記ルート部の前記厚板鋼板の板厚方向の寸法が該厚板鋼板の板厚の１／４より大に設定されていることを特徴とする。
即ち、上述したように、角継手にアーク溶接を用いる場合、当該角継手部分について剛性及び強度を確保しようとするとルート部の板厚方向の寸法を例えば厚板鋼板の板厚の１／４以下にするのがよく、換言すれば、ルート部の板厚方向の寸法が例えば厚板鋼板の板厚の１／４より大きければ角継手部分に十分な剛性及び強度を確保できない可能性が高いのであるが、ルート部の板厚方向の寸法が厚板鋼板の板厚の１／４より大きい場合であっても、ルート部にレーザー溶接を施工することで完全溶込み継手が実現されて角継手部分の剛性及び強度が確保され、さらに、この場合には、レーザー溶接を施工する距離が長くなる一方でアーク溶接の施工範囲が狭められ、アーク溶接による残留応力の発生や厚板鋼板の熱変形が好適に抑制される。 Moreover, in the corner joint structure of the pier of Claim 4, in any one of Claim 1 thru | or 3, the dimension of the plate | board thickness direction of the said thick steel plate of the said route part is 1/4 of the plate | board thickness of this thick steel plate. It is characterized by being set to large.
That is, as described above, when arc welding is used for a corner joint, the dimension in the thickness direction of the root portion is, for example, ¼ or less of the plate thickness of the thick steel plate in order to ensure rigidity and strength for the corner joint portion. In other words, if the dimension in the thickness direction of the root portion is larger than 1/4 of the thickness of the thick steel plate, for example, there is a high possibility that sufficient rigidity and strength cannot be secured in the corner joint portion. However, even if the dimension in the thickness direction of the root part is larger than 1/4 of the thickness of the steel plate, a perfect penetration joint is realized by applying laser welding to the root part. The rigidity and strength of the part are ensured. Furthermore, in this case, the distance for laser welding is increased while the range of arc welding is reduced, generating residual stress due to arc welding and thermal deformation of thick steel plates. Is suitably suppressed

請求項５の橋脚の角継手工法では、隣り合う厚板鋼板のうち一方の厚板鋼板の端面を他方の厚板鋼板の端縁側面に溶接して構成される橋脚の角継手工法であって、前記一方の厚板鋼板の端面に開先を形成する第一工程と、該開先のルート部にレーザー溶接を施工する第二工程と、該第二工程を実施した後、前記開先の拡開部にアーク溶接を施工し溶接金属を装填する第三工程とを有することを特徴とする。   The pier corner joint method according to claim 5 is a pier corner joint method constructed by welding the end face of one of the thick steel plates to the edge side surface of the other thick steel plate among the adjacent thick steel plates. The first step of forming a groove on the end face of the one thick steel plate, the second step of applying laser welding to the root portion of the groove, and after performing the second step, And a third step of performing arc welding on the expanded portion and loading the weld metal.

即ち、厚板鋼板を溶接して構成される橋脚の角継手を完全溶込み継手にしようとすると、アーク溶接だけでは、開先の拡開部の増大により溶接金属の使用量が増加し、溶接金属の熱収縮により厚板鋼板内に大きな残留応力が発生したり、或いは入熱が大きくなるために厚板鋼板が熱変形したりするのであるが、一方の厚板鋼板の端面に開先を形成し（第一工程）、当該開先のルート部にレーザー溶接を施工し（第二工程）、その後、拡開部にアーク溶接を施工し溶接金属を装填することで（第三工程）、溶接金属の使用量が必要最小限に抑えられて残留応力の発生が抑制され、入熱が少なくされて厚板鋼板の熱変形が抑制され、開先の拡開部を増大させることなく或いは入熱を大きくすることなく完全溶込み継手が容易に実現される。   In other words, when attempting to make a pier corner joint made by welding thick steel plates into a fully-penetrated joint, arc welding alone increases the amount of weld metal used due to an increase in the widened portion of the groove, and welding A large residual stress is generated in the steel plate due to heat shrinkage of the metal, or the steel plate is thermally deformed due to an increase in heat input, but a groove is formed on the end surface of one steel plate. By forming (first step), applying laser welding to the root portion of the groove (second step), and then applying arc welding to the expanded portion and loading the weld metal (third step), The amount of weld metal used is reduced to the minimum necessary, the occurrence of residual stress is suppressed, the heat input is reduced, the thermal deformation of the thick steel plate is suppressed, and the welded portion is not increased or increased. A fully-penetrated joint can be easily realized without increasing heat.

請求項１の橋脚の角継手構造によれば、開先のルート部をレーザー溶接により溶接し、拡開部をアーク溶接により溶接することで、溶接金属の使用量を必要最小限に抑えて残留応力の発生を抑制し、厚板鋼板の熱変形を抑制することができ、開先の拡開部を増大させることなく或いは入熱を大きくすることなく、厚板鋼板を溶接して構成される橋脚の角継手に完全溶込み継手を容易に実現できる。   According to the corner joint structure of the bridge pier of claim 1, the root portion of the groove is welded by laser welding, and the expanded portion is welded by arc welding, so that the amount of weld metal used can be kept to the minimum necessary and remains. Suppresses the generation of stress, suppresses thermal deformation of thick steel plates, and is constructed by welding thick steel plates without increasing the widened portion of the groove or increasing the heat input. A perfect penetration joint can be easily realized in the corner joint of the pier.

これにより、溶接作業の省力化及び溶接材料の削減を図りながら、角継手の剛性及び強度を確保でき、高い耐震性能を有した橋脚を実現することができる。
また、請求項２の橋脚の角継手構造によれば、厚板鋼板の板厚が厚いような場合において、開先を振り分けることで開先の拡開部を極力小さくでき、アーク溶接による残留応力の発生や厚板鋼板の熱変形を良好に抑制することができる。 As a result, the rigidity and strength of the corner joint can be ensured while saving the welding work and reducing the welding material, and a bridge pier having high seismic performance can be realized.
Further, according to the corner joint structure of the pier of claim 2, in the case where the thickness of the thick steel plate is thick, the groove widening portion can be made as small as possible by distributing the groove, and the residual stress due to arc welding can be reduced. Generation and thermal deformation of the thick steel plate can be satisfactorily suppressed.

また、請求項３の橋脚の角継手構造によれば、厚板鋼板の板厚が比較的薄いような場合において、アーク溶接による残留応力の発生や厚板鋼板の熱変形を抑制しつつ、橋脚の外側からだけで溶接作業を完了でき、溶接作業をより一層省力化することができる。
また、請求項４の橋脚の角継手構造によれば、ルート部の板厚方向の寸法を厚板鋼板の板厚の１／４より大きくした場合であっても、ルート部にレーザー溶接を施工することで完全溶込み継手を実現して角継手部分の剛性及び強度を確保でき、この場合、さらに、アーク溶接の施工範囲が狭められることでアーク溶接による残留応力の発生や厚板鋼板の熱変形を好適に抑制することができる。 Moreover, according to the corner joint structure of the pier of claim 3, when the plate thickness of the thick steel plate is relatively thin, the occurrence of residual stress due to arc welding and the thermal deformation of the thick steel plate are suppressed, and the pier The welding operation can be completed only from the outside, so that the labor can be further saved.
Further, according to the corner joint structure of the pier of claim 4, laser welding is applied to the root portion even when the dimension in the thickness direction of the root portion is larger than 1/4 of the thickness of the thick steel plate. As a result, a fully-penetrated joint can be realized to ensure the rigidity and strength of the corner joint part.In this case, the arc welding construction range is further narrowed, resulting in the occurrence of residual stress due to arc welding and the heat of thick steel plates. Deformation can be suitably suppressed.

請求項５の橋脚の角継手工法によれば、開先のルート部をレーザー溶接により溶接し、その後、拡開部をアーク溶接により溶接することで、溶接金属の使用量を必要最小限に抑えて残留応力の発生を抑制し、厚板鋼板の熱変形を抑制することができ、開先の拡開部を増大させることなく或いは入熱を大きくすることなく、厚板鋼板を溶接して構成される橋脚の角継手に完全溶込み継手を容易に実現できる。   According to the corner joint method of a bridge pier of claim 5, the root portion of the groove is welded by laser welding, and then the expanded portion is welded by arc welding, thereby minimizing the amount of weld metal used. It is possible to suppress the occurrence of residual stress and suppress thermal deformation of the thick steel plate, and it is constructed by welding the thick steel plate without increasing the widened part of the groove or increasing the heat input. A perfect penetration joint can be easily realized in the corner joint of the pier.

これにより、溶接作業の省力化及び溶接材料の削減を図りながら高い耐震性能を有した橋脚を実現することができる。   Thereby, it is possible to realize a bridge pier having high seismic performance while reducing the welding work and reducing the welding material.

以下、本発明の実施形態を添付図面に基づいて説明する。
図１には本発明に係る角継手構造の適用される鋼製の橋脚が示されており、図２には図１のＡ−Ａ線に沿う橋脚の断面図が示されており、以下、これらの図に基づき説明する。
図１に示すように、鋼製の橋脚１は、例えば高架道路等を支持する橋脚であって腕部２と脚部４とからＴ字型をなし、複数の厚板鋼板１０の端縁を溶接により互いに繋ぎ合わせることで閉断面構造の構造物として構成されている。 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows a steel pier to which a corner joint structure according to the present invention is applied, and FIG. 2 shows a cross-sectional view of the pier along the line AA in FIG. Description will be made based on these drawings.
As shown in FIG. 1, a steel pier 1 is a pier that supports, for example, an elevated road and has a T shape from an arm portion 2 and a leg portion 4, and ends of a plurality of thick steel plates 10. It is configured as a structure with a closed cross-section structure by joining together by welding.

ここに、厚板鋼板１０は例えば一様な所定板厚ｔ1（例えば、２５mm〜６０mm）の平板である。
図２に示すように、脚部４では、隣り合う厚板鋼板１０ａ〜１０ｄは角継手の全長に亘り端縁にて互いにレーザー溶接及びアーク溶接により溶接され、溶接金属盛４０が形成されている。これにより、脚部４において断面矩形の閉断面構造が形成されている。 Here, the thick steel plate 10 is, for example, a flat plate having a uniform predetermined plate thickness t1 (for example, 25 mm to 60 mm).
As shown in FIG. 2, in the leg portion 4, the adjacent thick steel plates 10 a to 10 d are welded to each other by laser welding and arc welding at the end edges over the entire length of the corner joint to form a weld metal stack 40. . Thereby, a closed cross-sectional structure having a rectangular cross section is formed in the leg portion 4.

図３を参照すると、厚板鋼板１０を互いに溶接する橋脚１の製造工程が図示されており、以下、同図に基づき橋脚の角継手工法について詳しく説明する。なお、ここでは、代表として厚板鋼板１０ａ、１０ｂを例に説明する。
先ず、厚板鋼板１０ａの端面２０には、アーク溶接のためのＶ型開先２２が形成される（第一工程）。 Referring to FIG. 3, a manufacturing process of the pier 1 for welding the thick steel plates 10 to each other is illustrated, and the corner joint construction method of the pier will be described in detail below based on the same drawing. Here, as an example, the thick steel plates 10a and 10b will be described as an example.
First, a V-shaped groove 22 for arc welding is formed on the end face 20 of the thick steel plate 10a (first step).

即ち、Ｖ型開先２２は、図４に拡大して示すように、端面２０のうち板厚方向の中央部がルート部２４として残るように面取りされる。
詳しくは、後述するように当該ルート部２４にはレーザー溶接が施工されるため、ルート部２４の板厚方向の寸法Ｌは、例えば板厚方向でレーザー溶接を実施可能な最大値、即ちレーザー溶接の能力に対応した寸法に設定される。 That is, the V-shaped groove 22 is chamfered so that the central portion in the thickness direction of the end surface 20 remains as the root portion 24 as shown in an enlarged view in FIG.
Specifically, since laser welding is performed on the route portion 24 as described later, the dimension L in the plate thickness direction of the route portion 24 is, for example, the maximum value at which laser welding can be performed in the plate thickness direction, that is, laser welding. It is set to the dimension corresponding to the ability.

ところで、角継手にアーク溶接だけを適用する場合には、上述したように、未溶接となるルート部２４の板厚方向の寸法Ｌを例えば厚板鋼板１０の板厚ｔ1の１／４（ｔ1／４）以下にするのがよいことが知られており、換言すれば、未溶接となるルート部２４の板厚方向の寸法Ｌが例えば厚板鋼板１０の板厚ｔ1の１／４よりも大きい場合には角継手部分に十分な剛性及び強度を確保できない可能性が高いことが知られている。   By the way, when only arc welding is applied to the corner joint, as described above, the dimension L in the thickness direction of the root portion 24 that is unwelded is set to, for example, 1/4 (t1) of the thickness t1 of the thick steel plate 10. / 4) It is known that it is preferable to make the following or less. In other words, the dimension L in the thickness direction of the root portion 24 that is unwelded is, for example, less than ¼ of the thickness t1 of the thick steel plate 10. When it is large, it is known that there is a high possibility that sufficient rigidity and strength cannot be secured in the corner joint portion.

しかしながら、本願のようにルート部２４にレーザー溶接を施工する場合には、当該寸法Ｌを板厚ｔ1の１／４以下に抑える理由はなく、逆にレーザー溶接の能力の範囲内であれば当該寸法Ｌを板厚ｔ1の１／４よりも大きくすることが可能である。
従って、より詳しくは、ルート部２４の板厚方向の寸法Ｌは、例えばレーザー溶接の能力の範囲内で厚板鋼板１０の板厚ｔ1の１／４よりも大きな寸法に設定される。 However, when laser welding is applied to the root portion 24 as in the present application, there is no reason to suppress the dimension L to ¼ or less of the plate thickness t1, and conversely, if the laser welding is within the range of the capability of laser welding. It is possible to make the dimension L larger than 1/4 of the plate thickness t1.
Therefore, more specifically, the dimension L in the thickness direction of the root portion 24 is set to a dimension larger than 1/4 of the thickness t1 of the thick steel sheet 10 within the range of the laser welding capability, for example.

そして、厚板鋼板１０ａのルート部２４が厚板鋼板１０ｂの端縁側面３０に当接させられ、先ずルート部２４にレーザー溶接が施工される。詳しくは、ルート部２４が厚板鋼板１０ｂの他方の端縁側面３０に当接した状態で、例えばＹＡＧレーザーまたはＣＯ2レーザー等のレーザー光Ｒがレーザー溶接機５０により橋脚１の外側、即ち拡開部２６側からルート部２４に向けて照射される。これにより、ルート部２４が厚板鋼板１０ｂの端縁側面３０に溶接される。 Then, the root portion 24 of the thick steel plate 10a is brought into contact with the edge side surface 30 of the thick steel plate 10b, and laser welding is first applied to the root portion 24. Specifically, in a state where the root portion 24 is in contact with the other edge side surface 30 of the thick steel plate 10b, a laser beam R such as a YAG laser or a CO 2 laser is applied to the outside of the pier 1 by the laser welding machine 50, that is, the expansion. Irradiation from the open portion 26 side toward the route portion 24 is performed. Thereby, the route part 24 is welded to the edge side surface 30 of the thick steel plate 10b.

厚板鋼板１０ａのルート部２４がレーザー溶接によって厚板鋼板１０ｂの端縁側面３０に溶接されたら、Ｖ型開先２２の拡開部２６，２８内に溶接金属棒４２が挿入され、アーク放電により溶融した溶接金属が周縁の厚板鋼板１０ａ、１０ｂを溶かしながら数パス施工程度の作業でアーク溶接が実施される（第三工程）。
これにより、図５に溶接部を拡大して示すように、Ｖ型開先２２のルート部２４がレーザー溶接により厚板鋼板１０ｂに溶接されるとともに、アーク溶接により、拡開部２６，２８が厚板鋼板１０ｂに溶接され、拡開部２６，２８内にそれぞれ溶接金属が装填されて溶接金属盛４０が形成される。 When the root portion 24 of the thick steel plate 10a is welded to the edge side surface 30 of the thick steel plate 10b by laser welding, the weld metal rod 42 is inserted into the widened portions 26 and 28 of the V-shaped groove 22, and arc discharge is performed. Arc welding is carried out in a work of several passes while the weld metal melted by melting the thick steel plates 10a, 10b at the periphery (third step).
Thereby, as shown in FIG. 5 in which the welded portion is enlarged, the root portion 24 of the V-shaped groove 22 is welded to the thick steel plate 10b by laser welding, and the expanded portions 26 and 28 are formed by arc welding. The welded metal plate 40 is formed by welding the thick steel plate 10b and loading the weld metal into the expanded portions 26 and 28, respectively.

以下、このように製造された本発明に係る橋脚の角継手構造及び角継手工法の作用及び効果について説明する。なお、ここでも代表として厚板鋼板１０ａ、１０ｂを例に説明する。
仮に橋脚１の角継手にアーク溶接のみによって完全溶込み継手を実現しようとすると、拡開部２６，２８を増大させたり、ルート部２４まで溶接する必要があるためにアーク放電を強くすることが要求される。これにより、溶接金属の使用量が増加し、溶接金属の熱収縮により厚板鋼板１０ａ、１０ｂ内に大きな残留応力が発生したり、或いは入熱が大きくなるために厚板鋼板１０ａ、１０ｂが熱変形したりする。 Hereinafter, the operation and effect of the corner joint structure and the corner joint construction method according to the present invention manufactured as described above will be described. Here, as an example, the thick steel plates 10a and 10b will be described as an example.
If it is going to realize a complete penetration joint only by arc welding to the corner joint of the pier 1, it is necessary to increase the expanded parts 26 and 28 or to weld to the root part 24, so that the arc discharge is strengthened. Required. As a result, the amount of weld metal used is increased, and a large residual stress is generated in the thick steel plates 10a and 10b due to thermal shrinkage of the weld metal, or the heat input is increased, so that the thick steel plates 10a and 10b are heated. Or deform.

しかしながら、上記のように、厚板鋼板１０ａのルート部２４がレーザー溶接によって厚板鋼板１０ｂに溶接されると、拡開部２６，２８を増大させる必要がなく、逆に、ルート部２４の板厚方向の寸法については、厚板鋼板１０の板厚ｔ1の１／４よりも大きく、例えばレーザー溶接の能力に対応した寸法に設定するようにしているため、ルート部２４の板厚方向の寸法を極力長くする一方でアーク溶接の施工範囲、即ち拡開部２６，２８を縮小可能であり、溶接作業を上記の如く数パス施工程度に削減できるとともに、溶接金属の使用量を必要最小限に抑えて溶接金属の熱収縮量を縮減でき、厚板鋼板１０ａ、１０ｂ内における残留応力の発生を抑制することができる。また、アーク溶接の施工は拡開部２６，２８の範囲だけでよく、ルート部２４までアーク溶接を施す必要がないため、アーク放電をそれほど強くしなくてもアーク溶接を完了することが可能であり、入熱を少なくして厚板鋼板１０ａ、１０ｂの熱変形を抑制することができる。   However, as described above, when the root portion 24 of the thick steel plate 10a is welded to the thick steel plate 10b by laser welding, there is no need to increase the expanded portions 26 and 28, and conversely, the plate of the root portion 24 The dimension in the thickness direction is larger than ¼ of the thickness t1 of the thick steel sheet 10 and is set to a dimension corresponding to, for example, the ability of laser welding. The welding range of arc welding, that is, the expanded portions 26 and 28 can be reduced while the welding operation can be reduced to about several passes as described above, and the amount of weld metal used can be minimized. Thus, the amount of heat shrinkage of the weld metal can be reduced, and the occurrence of residual stress in the thick steel plates 10a and 10b can be suppressed. Further, arc welding can be performed only in the range of the expanded portions 26 and 28, and it is not necessary to perform arc welding up to the root portion 24. Therefore, it is possible to complete the arc welding without making the arc discharge so strong. Yes, it is possible to reduce heat input and suppress thermal deformation of the thick steel plates 10a and 10b.

即ち、厚板鋼板１０ａのルート部２４をレーザー溶接によって厚板鋼板１０ｂに溶接し、その後、拡開部２６，２８をアーク溶接により溶接することにより、拡開部２６，２８を増大させることなく、或いは入熱を大きくすることなく完全溶込み継手を容易に実現でき、角継手の剛性及び強度を確保することができる。
これにより、溶接作業の省力化及び溶接材料の削減を図り、コスト削減を図りながら、高い耐震性能を有した橋脚を実現することができる。また、厚板鋼板１０ａの端面２０に形成した開先をＶ型開先２２としているので、例えば厚板鋼板１０ａの板厚が厚いような場合において、開先部を開先部２６，２８のように振り分けることができ、開先部２６，２８をそれぞれ極力小さくでき、アーク溶接により厚板鋼板１０ａ、１０ｂ内に生じる残留応力や厚板鋼板１０ａ、１０ｂの熱変形を良好に抑制することができる。 That is, the root portion 24 of the thick steel plate 10a is welded to the thick steel plate 10b by laser welding, and then the expanded portions 26 and 28 are welded by arc welding without increasing the expanded portions 26 and 28. Alternatively, a complete penetration joint can be easily realized without increasing heat input, and the rigidity and strength of the corner joint can be ensured.
As a result, it is possible to realize a bridge pier having high seismic performance while saving labor and reducing welding materials and reducing costs. In addition, since the groove formed on the end surface 20 of the thick steel plate 10a is the V-shaped groove 22, for example, when the plate thickness of the thick steel plate 10a is thick, the groove portion is the groove portion 26, 28. The groove portions 26 and 28 can be made as small as possible, and the residual stress generated in the thick steel plates 10a and 10b by arc welding and the thermal deformation of the thick steel plates 10a and 10b can be satisfactorily suppressed. it can.

なお、ここでは、厚板鋼板１０ａの端面２０にＶ型開先２２を形成するようにしているが、例えば厚板鋼板１０ａの板厚が比較的薄いような場合には、図６に拡大して示すように、当該端面２０に橋脚１の外側に拡開するレ型開先（またはＪ型開先）２２’を形成するようにしてもよい。
このように開先を橋脚１の外側に拡開するレ型開先２２’にできれば、アーク溶接により厚板鋼板１０ａ、１０ｂ内に生じる残留応力や厚板鋼板１０ａ、１０ｂの熱変形を抑制しつつ、橋脚１の外方側からだけで溶接作業を完了することが可能となり、溶接作業をより一層省力化することができる。 Here, the V-shaped groove 22 is formed on the end surface 20 of the thick steel plate 10a. However, for example, when the plate thickness of the thick steel plate 10a is relatively thin, it is enlarged to FIG. As shown in the drawing, a ladle groove (or J-shaped groove) 22 ′ that expands outside the pier 1 may be formed on the end face 20.
In this way, if the groove can be formed into a lave groove 22 ′ that expands to the outside of the pier 1, residual stress generated in the thick steel plates 10a and 10b by arc welding and thermal deformation of the thick steel plates 10a and 10b can be suppressed. On the other hand, the welding operation can be completed only from the outer side of the pier 1, and the welding operation can be further labor-saving.

以上で本発明に係る実施形態の説明を終えるが、実施形態は上記に限られるものではなく、発明の趣旨を逸脱しない範囲で種々変形可能である。
例えば、上記実施形態では、本発明に係る橋脚の角継手構造を脚部４の角継手に適用した場合を例に説明したが、本発明は当然に腕部２の角継手等にも適用可能である。 Although the description of the embodiment according to the present invention is finished above, the embodiment is not limited to the above, and various modifications can be made without departing from the spirit of the invention.
For example, in the above-described embodiment, the case where the corner joint structure of the pier according to the present invention is applied to the corner joint of the leg portion 4 has been described as an example, but the present invention is naturally applicable to a corner joint or the like of the arm portion 2. It is.

本発明に係る角継手構造の適用される鋼製の橋脚を示す図である。It is a figure which shows the steel pier to which the corner joint structure which concerns on this invention is applied. 図１のＡ−Ａ線に沿う橋脚の断面図である。It is sectional drawing of the pier in alignment with the AA of FIG. 橋脚の製造工程を示す図である。It is a figure which shows the manufacturing process of an pier. Ｖ型開先の拡大図である。It is an enlarged view of a V-shaped groove. 溶接部の拡大図である。It is an enlarged view of a welding part. レ型開先の拡大図である。It is an enlarged view of a lathe groove.

符号の説明Explanation of symbols

１ 橋脚
２ 腕部
４ 脚部
１０ 厚板鋼板
１０ａ〜１０ｄ 厚板鋼板
２０ 端面
２２ Ｖ型開先
２２’レ型開先
２４ ルート部
２６ 拡開部
２８ 拡開部
３０ 端縁側面
４０ 溶接金属盛
４２ 溶接金属棒
５０ レーザー溶接機 DESCRIPTION OF SYMBOLS 1 Bridge pier 2 Arm part 4 Leg part 10 Thick plate steel plate 10a-10d Thick plate steel plate 20 End face 22 V-type groove 22'-type groove 24 Root part 26 Wide part 28 Wide part 30 Edge side surface 40 Weld metal scale 42 Welded metal rod 50 Laser welding machine

Claims (5)

隣り合う厚板鋼板のうち一方の厚板鋼板の端面を他方の厚板鋼板の端縁側面に溶接して構成される橋脚の角継手構造であって、
前記一方の厚板鋼板の端面に開先が形成され、
該開先のルート部にレーザー溶接が施工されるとともに、拡開部にアーク溶接が施工されて溶接金属が装填されてなることを特徴とする橋脚の角継手構造。 The corner joint structure of the pier constructed by welding the end face of one thick steel plate to the edge side surface of the other thick steel plate among adjacent thick steel plates,
A groove is formed on the end face of the one thick steel plate,
A corner joint structure of a bridge pier, in which laser welding is applied to the root portion of the groove and arc welding is applied to the expanded portion and a weld metal is loaded. 前記開先はＶ型開先であることを特徴とする、請求項１記載の橋脚の角継手構造。   The corner joint structure of a pier according to claim 1, wherein the groove is a V-shaped groove. 前記開先は橋脚の外方側に拡開するレ型またはＪ型開先であることを特徴とする、請求項１記載の橋脚の角継手構造。   The corner joint structure of a pier according to claim 1, wherein the groove is a ret type or a J type groove that expands outward of the pier. 前記ルート部の前記厚板鋼板の板厚方向の寸法が該厚板鋼板の板厚の１／４より大に設定されていることを特徴とする、請求項１乃至３のいずれか記載の橋脚の角継手構造。   The pier according to any one of claims 1 to 3, wherein a dimension of the root portion in the thickness direction of the thick steel plate is set to be larger than 1/4 of a thickness of the thick steel plate. Corner joint structure. 隣り合う厚板鋼板のうち一方の厚板鋼板の端面を他方の厚板鋼板の端縁側面に溶接して構成される橋脚の角継手工法であって、
前記一方の厚板鋼板の端面に開先を形成する第一工程と、
該開先のルート部にレーザー溶接を施工する第二工程と、
該第二工程を実施した後、前記開先の拡開部にアーク溶接を施工し溶接金属を装填する第三工程と、
を有することを特徴とする橋脚の角継手工法。 The corner joint construction method of the pier constructed by welding the end face of one thick steel plate to the edge side surface of the other thick steel plate among adjacent thick steel plates,
A first step of forming a groove on the end face of the one thick steel plate;
A second step of performing laser welding on the root portion of the groove;
After performing the second step, a third step of performing arc welding on the expanded portion of the groove and loading a weld metal;
A corner joint construction method for a pier characterized by comprising:
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JP2003164983A (en) * 2001-11-28 2003-06-10 Toshiba Corp Welding method for metallic member
JP2004223543A (en) * 2003-01-21 2004-08-12 Jfe Engineering Kk Compound welding method of laser beam and arc, and groove shape of welded joint used for the same

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EP2048285A1 (en) * 2006-07-31 2009-04-15 IHI Corporation Corner joint structure for bridge pier and method of producing the same
EP2048285A4 (en) * 2006-07-31 2009-11-11 Ihi Corp Corner joint structure for bridge pier and method of producing the same
US7921495B2 (en) 2006-07-31 2011-04-12 Ihi Corporation Corner joint structure for bridge pier and method of producing the same
CN109202353A (en) * 2018-10-25 2019-01-15 广州文冲船厂有限责任公司 A kind of fixed-position welding method of Type B hanging ring
CN109202353B (en) * 2018-10-25 2020-09-01 广州文冲船厂有限责任公司 Positioning welding method for B-shaped hoisting ring
CN115431004A (en) * 2022-09-30 2022-12-06 中冶(上海)钢结构科技有限公司 Method for assembling and welding flanges in large-span U-shaped trestle
CN115431004B (en) * 2022-09-30 2023-10-27 中冶(上海)钢结构科技有限公司 Welding method for inner flange of large-span U-shaped trestle

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