JP2012017563A - Steel plate floor and method of welding steel plate floor - Google Patents

Steel plate floor and method of welding steel plate floor Download PDF

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JP2012017563A
JP2012017563A JP2010153942A JP2010153942A JP2012017563A JP 2012017563 A JP2012017563 A JP 2012017563A JP 2010153942 A JP2010153942 A JP 2010153942A JP 2010153942 A JP2010153942 A JP 2010153942A JP 2012017563 A JP2012017563 A JP 2012017563A
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welding
rib
steel
deck plate
surface side
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Yoshihei Horie
佳平 堀江
Tsutomu Nishioka
勉 西岡
Hiroki Sugiyama
裕樹 杉山
Yoshihiro Kashu
義広 夏秋
Shoichiro Fujihira
正一郎 藤平
Nobuhito Okubo
宣人 大久保
Manabu Okumura
学 奥村
Yasuo Ueno
康雄 上野
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Hanshin Expressway Co Ltd
Katayama Stratech Corp
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Hanshin Expressway Co Ltd
Katayama Stratech Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a method of suppressing occurrence of a fatigue crack in a weld zone between a deck plate and a U-shaped rib of a steel plate floor at low cost.SOLUTION: An abutting portion between a deck plate 11 and a U-shaped rib 12 of a steel plate floor 1 is welded from both an outer surface side 13 and an inner surface side 14 of the U-shaped rib to form an outer weld zone 13 and an inner weld zone 14. Since a larger weld area is achieved compared to a conventional steel plate floor having only the outer weld zone, stress in the weld zones 13 and 14 is dispersed to suppress occurrence of a fatigue crack. Compared to manufacturing of a conventional steel plate floor, increase in man-power results only from a weld work at the inner surface side, causing no steep rise in construction costs. The inner surface side is welded by a dedicated welding device equipped with a weld torch on a carriage, which travels in a closed space inside the rib having a closed section.

Description

この発明は、鋼床版とその溶接方法に関する。   The present invention relates to a steel deck and its welding method.

橋梁に用いられる床版として、鋼製のフラットなデッキプレートの下面に、同じく鋼製の縦リブや横リブを配設して補強した鋼床版が知られている。
このような鋼床版は、コンクリートの打設が不要なことや軽量であること等の理由から鉄筋コンクリート床版等に比べて現場施工が簡便であり、汎用されている。 As a floor slab used for a bridge, a steel floor slab is also known which is reinforced by arranging steel vertical ribs and horizontal ribs on the lower surface of a flat deck plate made of steel.
Such steel slabs are widely used because they are simpler to construct on site than reinforced concrete slabs because they do not require concrete placement or are lightweight.

ここで鋼床版に用いられる縦リブとして、いわゆる閉断面リブが知られている。閉断面リブは、その長手方向に垂直な断面が下に凸の曲線形状をなしており、デッキプレートの下面に接近させると両側部が当接するようになっている。
こうして両側部が当接することで、閉断面リブの内部には長手方向に連続する閉空間が形成されることになる。 Here, so-called closed cross-section ribs are known as vertical ribs used in steel decks. The closed cross-section rib has a curved shape in which a cross section perpendicular to the longitudinal direction is convex downward, and both sides abut against each other when approaching the lower surface of the deck plate.
In this way, both side portions come into contact with each other, so that a closed space continuous in the longitudinal direction is formed inside the closed cross-section rib.

典型的な閉断面リブとして、図１および特許文献１に記載されているようなＵリブ１２が挙げられる。Ｕリブ１２は、ボトムパネル１２ａとボトムパネル１２ａの両側から広がって立ち上がるサイドパネル１２ｂとを有し、その長手方向に対して垂直な断面がほぼＵ字型の外観を呈している。以下、Ｕリブ１２を例に挙げて従来の鋼床版２について説明する。   A typical closed cross-section rib includes a U-rib 12 as described in FIG. The U-rib 12 has a bottom panel 12a and a side panel 12b rising from both sides of the bottom panel 12a and has a substantially U-shaped cross section perpendicular to the longitudinal direction. Hereinafter, the conventional steel slab 2 will be described by taking the U rib 12 as an example.

一般的なＵリブ１２は、その閉空間の縦横寸法（高さおよび幅寸法）が数十ｃｍ程度であって、内部に人間が入り込めない大きさとなっている。
そのため、デッキプレート１１へ溶接する際には、閉空間ｓの内側から人間が直接作業をおこなうことが不可能である。
このことから従来の鋼床版２では、図１のように、Ｕリブ１２のデッキプレート１１の下面への当接箇所の外面側からのみ、つまり閉空間ｓの外側のみから溶接をおこなって外溶接部１３を形成していた。 The general U-rib 12 has a vertical and horizontal dimensions (height and width dimensions) of a closed space of about several tens of centimeters, and is a size that a human cannot enter inside.
Therefore, when welding to the deck plate 11, it is impossible for a human to work directly from the inside of the closed space s.
Therefore, in the conventional steel slab 2, as shown in FIG. 1, welding is performed only from the outer surface side of the U rib 12 contacted with the lower surface of the deck plate 11, that is, only from the outside of the closed space s. A weld 13 was formed.

ここでデッキプレート１１の上面はアスファルト等により舗装されて舗装部１１ａとなっており、この上を車両が通行するため、車両の輪荷重によりデッキプレート１１に局部変形が生じる。
この局部変形にともなって、構造的に弱いデッキプレート１１とＵリブ１２との溶接箇所に応力が集中することになる。 Here, the upper surface of the deck plate 11 is paved with asphalt or the like to form a paved portion 11a, and the vehicle passes over the paved portion 11a. Therefore, the deck plate 11 is locally deformed by the wheel load of the vehicle.
With this local deformation, stress concentrates on the welded portion between the structurally weak deck plate 11 and the U rib 12.

とくに従来は、上記のように閉断面リブの外面側のみから溶接を行っていたため、溶接範囲が狭く（溶接面積が小さく）、応力集中の度合いが著しいものとなっている。そのため、当該溶接箇所に外溶接部１３を起点とした疲労亀裂が発生しやすく、特に大型車の交通量が多い橋梁では鋼床版の供用開始から十数年程度で疲労亀裂が発生した事例が多数見受けられている。この外溶接部１３を起点とした疲労亀裂は、亀裂ｃのようにデッキプレート１１にまで進展する事例と外溶接部１３の溶接ビードに沿って進展する事例（図示省略）が見受けられている。   In particular, conventionally, since the welding is performed only from the outer surface side of the closed cross-section rib as described above, the welding range is narrow (the welding area is small), and the degree of stress concentration is remarkable. For this reason, fatigue cracks starting from the outer welded portion 13 are likely to occur at the welded part, and particularly in bridges with heavy traffic on large vehicles, there are cases where fatigue cracks occurred in about ten years after the start of service of steel decks. Many are seen. As for the fatigue crack starting from the outer welded portion 13, there are cases in which the crack propagates to the deck plate 11 like the crack c and an example (not shown) that propagates along the weld bead of the outer welded portion 13.

このような疲労亀裂ｃは、鋼床版２の強度を低下させるとともに、デッキプレート１１への亀裂の進展にともなって舗装にひび割れが発生したり、路面が陥没したりして車両通行の障害にもなる。
デッキプレート１１の厚みを大きくすることで、このような亀裂発生を抑制する試みもなされているが、重量が増加して施工が難しくなるとともに材料コストも嵩んでしまう。その結果、全体的な工費が高騰してしまう問題があった。 Such fatigue cracks c reduce the strength of the steel slab 2 and cause cracks in the pavement as the cracks progress to the deck plate 11 or the road surface collapses, which may impede vehicle traffic. Also become.
Although attempts have been made to suppress the occurrence of such cracks by increasing the thickness of the deck plate 11, the weight increases, construction becomes difficult, and the material cost increases. As a result, there has been a problem that the overall construction cost will increase.

特開２００７−３３２５８８号公報JP 2007-332588 A

そこでこの発明の解決すべき課題は、鋼床版のデッキプレートと閉断面リブとの溶接箇所に疲労亀裂が発生するのを、コストをかけることなく抑制することである。   Therefore, the problem to be solved by the present invention is to suppress the occurrence of fatigue cracks at the welded portion between the deck plate of the steel deck and the closed cross-section rib without incurring costs.

上記した課題を解決するため、発明にかかる鋼床版では、そのデッキプレートと閉断面リブとの当接箇所を閉断面リブの外面側と内面側の両方から溶接して、外溶接部と内溶接部を形成する構成を採用したのである。   In order to solve the above problems, in the steel slab according to the invention, the contact portion between the deck plate and the closed cross-section rib is welded from both the outer surface side and the inner surface side of the closed cross-section rib, and A configuration for forming a welded portion was adopted.

デッキプレートと閉断面リブとが、閉断面リブの外面側と内面側の両面から溶接されているため、従来の閉断面リブの外面側からのみ溶接されていた場合と比べて溶接範囲（溶接面積）が広がっている。そのため、応力の分散が図られ、溶接箇所に疲労亀裂が発生するのを抑制できる。   Since the deck plate and the closed cross-section rib are welded from both the outer surface side and the inner surface side of the closed cross-section rib, the welding range (weld area) is compared to the case where welding is performed only from the outer surface side of the conventional closed cross-section rib. ) Is spreading. Therefore, the stress is dispersed, and the occurrence of fatigue cracks at the welded portion can be suppressed.

ここで、発明にかかる鋼床版の製造にあたっては、従来の鋼床版と比較して閉断面リブの内面側からの溶接作業の分だけ工数が増加しているに過ぎず、またデッキプレートの厚みを大きくする必要もないため、全体的な工費を抑えることができる。   Here, in the manufacture of the steel slab according to the invention, the number of man-hours is increased by the amount of welding work from the inner surface side of the closed cross-section rib compared to the conventional steel slab, Since it is not necessary to increase the thickness, the overall construction cost can be reduced.

デッキプレートと閉断面リブとを閉断面リブの内面側から溶接する方法は以下のとおりである。
まず、台車と台車に搭載されてアーク溶接用のガスおよび電力および溶接ワイヤを供給可能な溶接トーチとを有し、前記閉断面リブ内の閉空間をその長手方向に通り抜け可能な溶接装置を準備する。
つぎに、閉断面リブ内の閉空間の長手方向に沿って溶接装置を走行させながら、溶接トーチにより閉断面リブの内面側から前記デッキプレートと閉断面リブとの当接箇所のアーク溶接を行う。 The method of welding the deck plate and the closed cross-section rib from the inner surface side of the closed cross-section rib is as follows.
First, a welding apparatus is prepared which has a carriage and a welding torch mounted on the carriage and capable of supplying arc welding gas, power and welding wire, and capable of passing through the closed space in the closed cross-section rib in the longitudinal direction. To do.
Next, arc welding is performed at a contact portion between the deck plate and the closed cross-section rib from the inner surface side of the closed cross-section rib by a welding torch while running the welding apparatus along the longitudinal direction of the closed space in the closed cross-section rib. .

このようにすると、人間が入り込めない閉空間の内側から溶接を簡単におこなうことができる。
この溶接方法は、発明にかかる鋼床版を新たに製造する際にも、既存の鋼床版を発明にかかる鋼床版へと改修する際にも用いることができる。
すなわち、この内側からの溶接方法と従来の外側からの溶接方法とを組み合わせて、デッキプレートと閉断面リブとを両面から溶接して発明にかかる鋼床版を新たに製造してもよい。また、外側からのみ溶接された設置済の鋼床版を内側からも溶接して発明にかかる鋼床版へと改修してもよい。 If it does in this way, welding can be easily performed from the inside of the closed space where a human cannot enter.
This welding method can be used both when a steel slab according to the invention is newly produced and when an existing steel slab is modified to a steel slab according to the invention.
That is, the steel plate according to the present invention may be newly manufactured by combining the welding method from the inside and the conventional welding method from the outside and welding the deck plate and the closed cross-section rib from both sides. Further, the installed steel slab welded only from the outside may be welded also from the inside to be modified to the steel slab according to the invention.

発明にかかる鋼床版を以上のように構成したので、溶接箇所に疲労亀裂が生じるのを低コストで抑制できる。   Since the steel deck according to the present invention is configured as described above, it is possible to suppress the occurrence of fatigue cracks at the welded portion at a low cost.

従来の鋼床版の一部切り欠き斜視図Partial cutaway perspective view of conventional steel deck 実施形態の鋼床版の縦断面図Longitudinal sectional view of the steel deck of the embodiment 実施形態の鋼床版の溶接箇所の拡大縦断面図Enlarged longitudinal sectional view of the welded portion of the steel deck according to the embodiment 実施形態の溶接方法の概要を示す斜視図The perspective view which shows the outline | summary of the welding method of embodiment

以下、図面を参照しつつこの発明の実施形態について説明する。
図２に示すように、実施形態にかかる鋼床版１は、デッキプレート１１と、デッキプレート１１の下面に溶接された縦リブとしてのＵリブ１２とを備えており、橋梁に用いられる。 Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 2, the steel deck 1 according to the embodiment includes a deck plate 11 and U ribs 12 as vertical ribs welded to the lower surface of the deck plate 11 and is used for a bridge.

デッキプレート１１は、その下面に縦リブのほかにも補強のために多数の横リブが配設されており、主桁等の桁により下方から支持されているが、これらの構造は従来の鋼床版と同様である（図示省略）。   In addition to the vertical ribs, the deck plate 11 is provided with a number of horizontal ribs for reinforcement, and is supported from below by a girder such as a main girder. It is the same as the floor slab (not shown).

またデッキプレート１１は、鋼床版１の設置状態でそのフラットな上面がアスファルト等により舗装されて舗装部１１ａとなっており、この上を自動車等の車両が通行するようになっている。図２では、車両の車輪ｔを示している。
なお舗装部１１ａの両側は、車両の逸脱を防止するために突出して地覆となっている（図示省略）。 Further, the deck plate 11 has a flat upper surface paved with asphalt or the like in the installed state of the steel slab 1 to form a paved portion 11a on which a vehicle such as an automobile passes. FIG. 2 shows a vehicle wheel t.
In addition, both sides of the pavement portion 11a protrude and become ground cover in order to prevent deviation of the vehicle (not shown).

デッキプレート１１は、鋼板から形成されている。その鋼の種類は特に限定されないが、普通鋼や耐疲労鋼が例示できる。デッキプレート１１の厚みも特に限定されないが、１２ｍｍ〜１６ｍｍが例示できる。   The deck plate 11 is formed from a steel plate. Although the kind of the steel is not specifically limited, normal steel and fatigue-resistant steel can be illustrated. Although the thickness of the deck plate 11 is not specifically limited, 12 mm-16 mm can be illustrated.

Ｕリブ１２は、デッキプレート１１の下面において幅方向に多数が並列して配設され、デッキプレート１１の長手方向に平行に延びている。このＵリブ１２によりデッキプレート１１は補強されている。
Ｕリブ１２は鋼製であり、ボトムパネル１２ａとボトムパネル１２ａの両側から広がって立ち上がるサイドパネル１２ｂとからなり、その長手方向に垂直な断面がほぼＵ字型の外観を呈している。
Ｕリブ１２は、たとえば長尺の鋼板の幅方向の中央に対して両側を折り曲げ加工することで形成され、鋼板の中央がボトムパネル１２ａとなり両側がサイドパネル１２ｂとなる。これらの構造については従来と同様である。 A large number of U ribs 12 are arranged in parallel in the width direction on the lower surface of the deck plate 11, and extend parallel to the longitudinal direction of the deck plate 11. The deck plate 11 is reinforced by the U rib 12.
The U rib 12 is made of steel, and includes a bottom panel 12a and a side panel 12b rising from both sides of the bottom panel 12a, and a cross section perpendicular to the longitudinal direction has a substantially U-shaped appearance.
The U rib 12 is formed, for example, by bending both sides of the center of the long steel plate in the width direction, and the center of the steel plate becomes the bottom panel 12a and both sides become the side panels 12b. About these structures, it is the same as that of the past.

Ｕリブ１２は、デッキプレート１１の下面に両サイドパネル１２ｂの先端部（上端部）がそれぞれ当接して溶接されており、これによりその内部には長手方向に延びる閉空間ｓが形成されている。
Ｕリブ１２の大きさは特に限定されないが、閉空間ｓの縦横寸法が２０ｃｍ〜３０ｃｍ程度であって、内部に人間が入り込めない大きさとなっている。Ｕリブ１２の厚みも限定されないが、６ｍｍ程度が例示できる。 The U ribs 12 are welded so that the front end portions (upper end portions) of the side panels 12b are in contact with the lower surface of the deck plate 11, thereby forming a closed space s extending in the longitudinal direction. .
The size of the U rib 12 is not particularly limited, but the vertical and horizontal dimensions of the closed space s are about 20 cm to 30 cm, and the size is such that humans cannot enter inside. Although the thickness of the U rib 12 is not limited, about 6 mm can be exemplified.

図３に示すように、Ｕリブ１２とデッキプレート１１の当接箇所は、従来と同様に閉空間の外部すなわちＵリブ１２の外面側から溶接されて外溶接部１３となっている。
また同図に示すように、Ｕリブ１２とデッキプレート１１の当接箇所は、従来と異なり閉空間ｓの内部すなわちＵリブ１２の内面側からも溶接されて内溶接部１４となっている。 As shown in FIG. 3, the contact portion between the U rib 12 and the deck plate 11 is welded from the outside of the closed space, that is, from the outer surface side of the U rib 12, as in the conventional case, to form an outer weld portion 13.
Further, as shown in the figure, the contact portion between the U rib 12 and the deck plate 11 is welded from the inside of the closed space s, that is, from the inner surface side of the U rib 12 to form an inner welded portion 14 unlike the conventional case.

溶接の形式は特に限定されないが、たとえば図３のように、外溶接部１３は溶け込み溶接（溶接ワイヤが接合面に溶け込んでいる溶接）により形成され、内溶接部１４はすみ肉溶接（ほぼ直交する二つの面を溶接する三角形の断面をもつ溶接）により形成される。   The type of welding is not particularly limited. For example, as shown in FIG. 3, the outer welded portion 13 is formed by penetration welding (welding in which the welding wire is melted into the joint surface), and the inner welded portion 14 is fillet welded (substantially orthogonal). A weld with a triangular cross section that welds two faces).

Ｕリブ１２のサイドパネル１２ｂは通常上記のような折り曲げ加工により形成されているため、その先端面が傾斜しており、デッキプレート１１に当接させた場合にその当接箇所に外側へと開く隙間ができる。したがって、外溶接部１３はこの隙間を埋めたうえで強度を確保するために溶込み溶接とするのが好ましいからである。なお、溶込み溶接は強度確保のため溶込み量（溶接ワイヤの溶けた部分の最頂点と、溶接する面の表面との距離）を７５％以上とするのがより好ましい。   Since the side panel 12b of the U rib 12 is usually formed by bending as described above, the front end surface thereof is inclined, and when the U rib 12 is brought into contact with the deck plate 11, it opens outward at the contact position. There is a gap. Therefore, it is preferable that the outer welded portion 13 is penetration welding to fill the gap and secure strength. It is more preferable that the penetration amount (the distance between the top of the melted portion of the welding wire and the surface of the surface to be welded) be 75% or more in penetration welding.

また外溶接部１３を溶込み溶接した場合、内溶接部１４はすみ肉溶接で十分な疲労強度の向上が期待できるため、施工が容易なすみ肉溶接とするのが好ましい。なおすみ肉溶接は、強度確保のためその脚長（三角形の辺の長さ）を４ｍｍ以上とするのがより好ましい。
溶接の方法は特に限定されないが、アーク溶接として、ＭＡＧ（Ｍｅｔａｌ Ａｃｔｉｖｅ Ｇａｓ）溶接、ＴＩＧ（Ｔｕｎｇｓｔｅｎ Ｉｎｅｒｔ Ｇａｓ）溶接、プラズマアーク溶接が例示できる。 In addition, when the outer welded portion 13 is welded and welded, the inner welded portion 14 can be expected to have a sufficient improvement in fatigue strength by fillet welding. In addition, in fillet welding, it is more preferable that the leg length (the length of the side of the triangle) is 4 mm or more in order to ensure strength.
Although the welding method is not particularly limited, examples of arc welding include MAG (Metal Active Gas) welding, TIG (Tungsten Inert Gas) welding, and plasma arc welding.

実施形態の鋼床版１の構成は以上のようであり、そのデッキプレート１１とＵリブ１２とがＵリブ１２の内面側と外面側の両方から溶接部１３、１４により溶接されているため、片方からのみ溶接されている場合に比べて溶接面積が大きくなっている。そのため図２の矢印で示すように、デッキプレート１１に車輪ｔの輪荷重が負荷され、これにより溶接部１３、１４へ応力が生じても、それが広い範囲に分散されることになる。
したがって、溶接部１３、１４から疲労亀裂が発生するのを抑制することができる。従来の鋼床版２と比較して、Ｕリブ内面側からの溶接作業のみ工数が増えたに過ぎないので、全体工費が嵩むこともない。 The structure of the steel deck 1 of the embodiment is as described above, and the deck plate 11 and the U rib 12 are welded by the welded portions 13 and 14 from both the inner surface side and the outer surface side of the U rib 12, The welding area is larger than when welding is performed from only one side. Therefore, as shown by the arrow in FIG. 2, even if the wheel load of the wheel t is applied to the deck plate 11 and stress is generated in the welded portions 13 and 14 due to this, it is distributed over a wide range.
Therefore, the occurrence of fatigue cracks from the welds 13 and 14 can be suppressed. Compared to the conventional steel slab 2, only the number of man-hours for welding work from the inner surface side of the U rib is increased, so that the total construction cost is not increased.

以上の実施形態では、鋼床版１の縦リブとしてＵリブ１２を例示したが、この発明はデッキプレート１１の下面に両側部が当接することでその内部に長手方向に連続する閉空間が形成される鋼製の閉断面リブを有する鋼床版のすべてに適用可能である。   In the above embodiment, the U ribs 12 are exemplified as the vertical ribs of the steel slab 1, but the present invention forms a closed space continuous in the longitudinal direction inside the deck plate 11 by contacting both sides with the lower surface. It is applicable to all steel slabs with closed steel ribs.

このような実施形態の鋼床版１を製造するにあたっては、図４に示すように、デッキプレート１１を設置状態とは天地が逆になるように、すなわち下面が上に上面が下になるようにして作業床に載置する。その上に同じく設置状態とは天地が逆になった状態でＵリブ１２を載せてそのサイドパネル１２ｂをデッキプレート１１に当接させ、その当接箇所を溶接する。   In manufacturing the steel deck 1 of such an embodiment, as shown in FIG. 4, the deck plate 11 is placed upside down from the installed state, that is, the lower surface is up and the upper surface is down. And place it on the work floor. Further, the U-rib 12 is placed in a state where the top and bottom are reversed from the installation state, the side panel 12b is brought into contact with the deck plate 11, and the contact portion is welded.

Ｕリブ１２のサイドパネル１２ｂとデッキプレート１１の当接箇所をＵリブ１２の外面側から溶接して外溶接部１３を形成する作業については、人間がＵリブ１２の長さ方向に沿って移動しながら溶接ガンを直接操作する等、公知の方法により行われる。
Ｕリブ１２とデッキプレート１１とをＵリブ１２の内面側から溶接する作業については、上述のようにＵリブ内部の閉空間は人間が入り込めない大きさであるため、公知の方法では行うことができない。 For the operation of forming the outer welded portion 13 by welding the contact portion between the side panel 12 b of the U rib 12 and the deck plate 11 from the outer surface side of the U rib 12, a human moves along the length direction of the U rib 12. However, it is performed by a known method such as directly operating the welding gun.
As for the work of welding the U rib 12 and the deck plate 11 from the inner surface side of the U rib 12, as described above, the closed space inside the U rib is a size that cannot be entered by humans. I can't.

そこで、Ｕリブ１２とデッキプレート１１とをＵリブ１２の内面側から溶接する実施形態の溶接方法では、図４に示すように、Ｕリブ１２の閉空間に溶接装置２０を走行させる。
溶接装置２０はＵリブ１２の閉空間を長手方向に通り抜けられる寸法となっており、具体的には、その最大幅が一般的なＵリブ１２の閉空間の幅よりも小さい３０ｃｍ弱、その最大高さが一般的なＵリブ１２の閉空間の高さよりも小さい２２ｃｍ弱のものが例示できる。 Therefore, in the welding method according to the embodiment in which the U rib 12 and the deck plate 11 are welded from the inner surface side of the U rib 12, the welding apparatus 20 is caused to travel in the closed space of the U rib 12 as shown in FIG. 4.
The welding device 20 is dimensioned to pass through the closed space of the U-rib 12 in the longitudinal direction. Specifically, the maximum width is less than 30 cm, which is smaller than the width of the closed space of the general U-rib 12, and its maximum The thing of 22 cm or less whose height is smaller than the height of the closed space of the general U rib 12 can be illustrated.

この溶接装置２０は、台車２１を備える。この台車２１はモータが搭載される等して自走可能なものでもよいし、牽引ケーブル等を介して外部動力により走行可能なものでもよい。
また台車２１の前側にはアーク溶接を行うための公知の機構を有する溶接トーチ２２が搭載され、後側には公知の機構を有するワイヤ送給機２３が搭載されている。
台車２１は長さ寸法が大きくなる場合には、溶接トーチ２２搭載部分とワイヤ送給機２３搭載部分とで前後に分割して、鋼棒やチェーン等で連結してもよい。 The welding device 20 includes a carriage 21. The carriage 21 may be capable of self-propelling by mounting a motor or the like, or may be capable of traveling by external power via a traction cable or the like.
A welding torch 22 having a known mechanism for performing arc welding is mounted on the front side of the carriage 21, and a wire feeder 23 having a known mechanism is mounted on the rear side.
When the length of the carriage 21 is increased, the carriage 21 may be divided into a front part and a rear part of the welding torch 22 mounting part and the wire feeder 23 mounting part and connected by a steel rod or a chain.

また台車２１には、Ｕリブ１２の閉空間内をスムーズに走行できるようにかつ閉空間内を幅方向に横ずれしないように、その側部にＵリブ１２のサイドパネル１２ｂに倣うローラが付属している。   Also, the carriage 21 is attached with a roller that follows the side panel 12b of the U rib 12 on its side so that it can smoothly travel in the closed space of the U rib 12 and does not laterally shift in the closed space in the width direction. ing.

ここでワイヤ送給機２３には、溶接ワイヤが巻回されたスプールが付属し、このスプールから溶接ワイヤを繰り出して溶接トーチ２２に供給できるようになっている。さらに溶接トーチ２２には、ケーブル２４が接続されてアーク溶接に必要なガスおよび電力がガスボンベや電源から供給されるようにもなっている。
ケーブル２４はＵリブ１２の外側に配置された公知の巻き取り機２５に巻き取られており、台車２１が走行するに従って巻き取り機２５から繰り出されるようになっている。巻き取り機２５は、手動巻き取りタイプでも自動巻き取りタイプでも手動と自動を切り替え可能なタイプでもいずれでもよい。 Here, a spool around which a welding wire is wound is attached to the wire feeder 23, and the welding wire can be fed out from the spool and supplied to the welding torch 22. Further, a cable 24 is connected to the welding torch 22 so that gas and electric power necessary for arc welding are supplied from a gas cylinder or a power source.
The cable 24 is wound around a known winder 25 disposed outside the U-rib 12 and is fed out from the winder 25 as the carriage 21 travels. The winder 25 may be either a manual winding type, an automatic winding type, or a type that can be switched between manual and automatic.

また溶接トーチ２２は、溶接装置２０を正面側から見た場合に、ノズル先端部が斜め下を向くように台車２１上で保持されている。
このため、溶接装置２０を上述したように天地を逆にした鋼床版１のＵリブ閉空間内に入り込ませると、溶接トーチ２２のノズル先端部がデッキプレート１１とＵリブ１２との当接箇所の一側に対向するようになっている。
台車２１の走行開始および走行停止、溶接トーチ２２の溶接開始および終了等は、Ｕリブ１２の閉空間の外に配置された公知の制御ボックス（図示省略）により操作される。 Further, the welding torch 22 is held on the carriage 21 so that the tip of the nozzle faces obliquely downward when the welding apparatus 20 is viewed from the front side.
For this reason, when the welding apparatus 20 enters the U-rib closed space of the steel deck 1 with the top and bottom reversed as described above, the nozzle tip of the welding torch 22 contacts the deck plate 11 and the U-rib 12. It is designed to face one side of the location.
The start and stop of traveling of the carriage 21 and the start and end of welding of the welding torch 22 are operated by a known control box (not shown) arranged outside the closed space of the U rib 12.

実施形態の溶接方法に使用する溶接装置２０の構成は以上のようである。この溶接装置２０を天地を逆にした鋼床版１の閉空間に沿って走行させながら、そのワイヤ送給機２３から溶接ワイヤをそのケーブル２４からガスをそれぞれ溶接トーチ２２に供給する。   The configuration of the welding apparatus 20 used in the welding method of the embodiment is as described above. While this welding apparatus 20 is run along the closed space of the steel deck 1 with the top and bottom reversed, the welding wire is supplied from the wire feeder 23 and the gas is supplied from the cable 24 to the welding torch 22.

溶接トーチ２２の先端部はデッキプレート１１とＵリブ１２の両サイドパネル１２ｂとの当接箇所のうちの片方のサイドパネル１２ｂとの当接箇所に対向しているため、閉空間の中から当該当接箇所の溶接作業が実施され、その一側に内溶接部１４が形成される。   Since the front end of the welding torch 22 faces the abutting position of one side panel 12b of the abutting positions of the deck plate 11 and the U-rib 12 on both side panels 12b, The welding operation of the contact portion is performed, and the inner welded portion 14 is formed on one side thereof.

つぎに溶接装置２０を反転させて鋼床版１の閉空間に沿って先程とは逆向きに走行させ、デッキプレート１１とＵリブ１２のもう一方のサイドパネル１２ｂとの当接箇所にも同様の作業をおこなって内溶接部１４を形成する。
ここで、溶接トーチ２２とケーブル２４とを着脱可能にしておくと、溶接装置２０の本体からケーブル２４や巻き取り機２５を分離できるため、反転作業が容易となる。 Next, the welding device 20 is reversed and travels in the opposite direction to the previous direction along the closed space of the steel deck 1, and the same applies to the contact position between the deck plate 11 and the other side panel 12 b of the U rib 12. The inner welded portion 14 is formed by performing the above operations.
Here, if the welding torch 22 and the cable 24 are detachable, the cable 24 and the winder 25 can be separated from the main body of the welding apparatus 20, so that the reversing operation is facilitated.

以上の実施形態では、発明にかかる鋼床版１を新たに製造する場合の閉空間内からの溶接方法を例示したが、従来の鋼床版、すなわち外溶接部１３のみが存在する既設の鋼床版にこの方法を適用して発明にかかる鋼床版１へと改修してもよい。
その改修作業においては、鋼床版が設置された状態で溶接をおこなう必要があるため、実施形態とは天地が逆の状態となる。そのため、溶接装置２０の台車の下面に電磁石や永久磁石を設けるなどしてデッキプレート１１の下面に吸着させながら走行させ、閉空間内での溶接作業をおこなうことになる。 In the above embodiment, the welding method from the inside of the closed space in the case of newly manufacturing the steel deck 1 according to the invention has been exemplified, but the existing steel deck, that is, the existing steel in which only the outer welded portion 13 exists. The method may be applied to the floor slab and modified to the steel slab 1 according to the invention.
In the repair work, since it is necessary to perform welding in a state in which the steel deck is installed, the top and bottom of the embodiment is reversed. For this reason, an electromagnet or a permanent magnet is provided on the lower surface of the carriage of the welding apparatus 20 so as to be attracted to the lower surface of the deck plate 11 to perform welding work in a closed space.

また以上の実施形態では、溶接装置２０の台車２１に搭載される溶接トーチ２２が１つ（１電極）の場合を例示したが、溶接トーチ２２を２つ（２電極）にしてもよい。
そして、各溶接トーチ２２のノズル先端部が閉空間内においてデッキプレート１１とＵリブ１２の両サイドパネル１２ｂとの当接箇所にそれぞれ向くようにし、両側の当接箇所を同時に溶接できるようにしてもよい。このようにすると、溶接作業時間の短縮化が図られる。
この溶接装置２０は、鋼床版１の内部溶接に主として用いられるものであるが、鋼床版１と同様に内部に閉空間を有する構造体全般の内部溶接に用いることができるのは無論である。このような構造体の具体例としては、鋼板にＵリブなどの補剛材を溶接することで補強されたいわゆる補剛板が挙げられる。 Moreover, although the case where the number of welding torches 22 mounted on the carriage 21 of the welding apparatus 20 is one (one electrode) in the above embodiment, the number of welding torches 22 may be two (two electrodes).
The nozzle tip of each welding torch 22 is directed to the contact location between the deck plate 11 and both side panels 12b of the U rib 12 in the closed space, so that the contact locations on both sides can be welded simultaneously. Also good. In this way, the welding work time can be shortened.
The welding apparatus 20 is mainly used for internal welding of the steel slab 1, but it is needless to say that the welding apparatus 20 can be used for internal welding of a general structure having a closed space inside the steel slab 1. is there. A specific example of such a structure is a so-called stiffening plate reinforced by welding a stiffener such as a U-rib to a steel plate.

１ 実施形態の鋼床版
２ 従来の鋼床版
１１ デッキプレート
１１ａ 舗装部
１２ Ｕリブ
１２ａ ボトムパネル
１２ｂ サイドパネル
１３ 外溶接部
１４ 内溶接部
２０ 溶接装置
２１ 台車
２２ 溶接トーチ
２３ ワイヤ送給機
２４ ケーブル
２５ 巻き取り機
ｓ 閉空間
ｃ 亀裂
ｔ 車輪 DESCRIPTION OF SYMBOLS 1 Steel deck 2 of embodiment 11 Conventional steel deck 11 Deck plate 11a Pavement part 12 U rib 12a Bottom panel 12b Side panel 13 Outer welding part 14 Inner welding part 20 Welding device 21 Bogie 22 Welding torch 23 Wire feeder 24 Cable 25 Winder s Closed space c Crack t Wheel

Claims (2)

鋼製のデッキプレートと、
前記デッキプレートの下面に両側部が当接することでその内部に長手方向に連続する閉空間が形成される鋼製の閉断面リブと、を備え、
前記デッキプレートと前記閉断面リブとの当接箇所に、
前記閉断面リブの外面側から溶接された外溶接部と、
前記閉断面リブの内面側から溶接された内溶接部と、を有する鋼床版。 A steel deck plate,
Steel closed cross-section ribs in which a closed space continuous in the longitudinal direction is formed inside both sides by contacting the lower surface of the deck plate,
At the contact point between the deck plate and the closed cross-section rib,
An outer welded portion welded from the outer surface side of the closed cross-section rib;
An inner welded portion welded from the inner surface side of the closed cross-section rib. 鋼製のデッキプレートと、デッキプレートの下面に両側部が当接することでその内部に長手方向に連続する閉空間が形成される鋼製の閉断面リブと、を前記当接箇所で溶接する鋼床版の溶接方法であって、
台車と台車に搭載されてアーク溶接用のガスおよび電力および溶接ワイヤを供給可能な溶接トーチとを有し、前記閉断面リブ内の閉空間をその長手方向に通り抜け可能な溶接装置を準備するステップと、
前記閉断面リブ内の閉空間の長手方向に沿って前記溶接装置を走行させながら、前記溶接トーチにより閉断面リブの内面側から前記デッキプレートと閉断面リブとの当接箇所のアーク溶接をおこなうステップと、を含む鋼床版の溶接方法。 Steel that welds a steel deck plate and a steel closed cross-section rib in which both sides are in contact with the lower surface of the deck plate to form a closed space continuous in the longitudinal direction inside the steel plate at the contact location A welding method for floor slabs,
A step of preparing a welding apparatus which has a carriage and a welding torch mounted on the carriage and capable of supplying arc welding gas, electric power and welding wire, and capable of passing through a closed space in the closed cross-section rib in the longitudinal direction thereof; When,
While the welding apparatus is running along the longitudinal direction of the closed space in the closed cross-section rib, arc welding is performed at the contact point between the deck plate and the closed cross-section rib from the inner surface side of the closed cross-section rib by the welding torch. And a method for welding a steel deck.
JP2010153942A 2010-07-06 2010-07-06 Steel plate floor and method of welding steel plate floor Pending JP2012017563A (en)

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CN117464134A (en) * 2023-12-26 2024-01-30 中铁四局集团有限公司 Streamline flat steel box girder welding equipment and processing method thereof
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