JP6584707B1 - Backing ring for weld connection of different diameter pipes in steel pipe piles - Google Patents

Backing ring for weld connection of different diameter pipes in steel pipe piles Download PDF

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JP6584707B1
JP6584707B1 JP2019073483A JP2019073483A JP6584707B1 JP 6584707 B1 JP6584707 B1 JP 6584707B1 JP 2019073483 A JP2019073483 A JP 2019073483A JP 2019073483 A JP2019073483 A JP 2019073483A JP 6584707 B1 JP6584707 B1 JP 6584707B1
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榎本隆彦
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株式会社シグマベース
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Abstract

【課題】内径が僅かに異なる２つの鋼管を突合せ溶接する場合に使用可能な裏当て金を、簡単にかつ安価に製作することを可能にする。【解決手段】裏当てリング８１は、内径大側鋼管（大径鋼管杭５１）の内面に可動に嵌合する大径部分８１ａと、内径小側鋼管（大径短尺管１３）の内面に可動に嵌合する小径部分８１ｂとが段差部８１ｃを介在させて一体連続してなるとともに、周方向の一部に切込み８１ｄを有して弾性的に径が縮小可能とされている。例えば、拡頭杭である上側の大径鋼管杭５１と下側の小径鋼管杭５２とを異形鋼管杭接続部材１０を介して連結する場合では、例えば大径鋼管杭５１と異形鋼管杭接続部材１０の大径短尺管１３とを突合せ溶接する際の裏当て金として用いることができる。例えば、短冊状の鋼板をプレス加工により段差を付け、リング状に湾曲成形するという簡単な加工で安価に製作できる。【選択図】図３A backing metal that can be used when two steel pipes having slightly different inner diameters are butt-welded can be easily and inexpensively manufactured. A backing ring 81 is movable on the inner surface of a large-diameter portion 81a that is movably fitted to the inner surface of an inner-diameter large-side steel pipe (large-diameter steel pipe pile 51), and on the inner surface of an inner-diameter small-side steel pipe (large-diameter short tube 13). A small-diameter portion 81b that is fitted to the inner portion is integrally continuous with a stepped portion 81c interposed therebetween, and has a notch 81d in a part of the circumferential direction so that the diameter can be elastically reduced. For example, in the case where the upper large-diameter steel pipe pile 51 and the lower small-diameter steel pipe pile 52 which are expanded head piles are connected via the deformed steel pipe pile connecting member 10, for example, the large diameter steel pipe pile 51 and the deformed steel pipe pile connecting member 10 are connected. Can be used as a backing metal when butt-welding the large diameter short tube 13. For example, a strip-shaped steel plate can be manufactured at low cost by a simple process of forming a step by pressing and bending it into a ring shape. [Selection] Figure 3

Description

この発明は、 鋼管杭において、突き合わせた時に内周面に段差が生じるような互いに内径の異なる２つの鋼管を突合せ溶接する際に用いられる異径管溶接接続用の裏当てリング（リング状の裏当て金）に関する。   The present invention relates to a backing ring for connecting different diameter pipes (ring-shaped back) used in butt welding two steel pipes having different inner diameters that cause a step on the inner peripheral surface when they are brought together in a steel pipe pile. Batter).

従来、鋼管杭の施工に際して、突き合わせた時に内周面に段差が生じるような互いに内径の異なる２つの鋼管を裏当て金を用いて突合せ溶接する場合、一方の鋼管の内面（内径）に合わせた第１筒状体と他方の管の内面（内径）に合わせた第２筒状体とを上下に突き合せた状態で仮付けすることで段差付き筒状体とし、この段差付き筒状体を裏当て金として用いて、内径の異なる前記２つの鋼管の突合せ溶接を行っていた。   Conventionally, when constructing steel pipe piles, when two steel pipes with different inner diameters that cause a step on the inner peripheral surface when they are butt-welded using a backing metal, they are matched to the inner surface (inner diameter) of one steel pipe. The first cylindrical body and the second cylindrical body matched to the inner surface (inner diameter) of the other tube are temporarily attached in a state where they are vertically butted to form a cylindrical body with a step. The two steel pipes having different inner diameters were butt welded as backing metal.

内径が僅かに異なる２つの鋼管を突合せ溶接する場合に、前記のように一方の鋼管の内面（内径）に合わせた第１筒状体と他方の鋼管の内面（内径）に合わせた第２筒状体とを上下に突き合せた状態で仮付けして、段差付き筒状体とする製作方法は、煩雑でありコストも高くなる。   When two steel pipes having slightly different inner diameters are butt welded, the first cylindrical body matched to the inner surface (inner diameter) of one steel pipe and the second cylinder matched to the inner surface (inner diameter) of the other steel pipe as described above The manufacturing method of temporarily attaching the shape body in a state where the shape body is abutted up and down to form a stepped cylindrical body is complicated and expensive.

本発明は上記背景のもとになされたもので、鋼管杭において、内径が僅かに異なる２つの鋼管を突合せ溶接する場合に使用可能な裏当て金を、簡単にかつ安価に製作することを可能にすることを目的とする。   The present invention has been made based on the above background, and it is possible to easily and inexpensively manufacture a backing metal that can be used when butt welding two steel pipes having slightly different inner diameters in a steel pipe pile. The purpose is to.

上記課題を解決する請求項１の発明は、鋼管杭において、突き合わせた時に内周面に段差が生じるような互いに内径の異なる２つの鋼管を突合せ溶接する際に用いられる異径管溶接接続用の裏当てリングであって、
内径大側鋼管の内面に可動に嵌合する大径部分８１ａと内径小側鋼管の内面に可動に嵌合する小径部分８１ｂとが、管内から見て大径部分側の凹湾曲断面部分と小径部分側の凸湾曲断面部分とが連続する態様の等厚の段差部８１ｃを介在させて一体連続してなるとともに、周方向の一部に隙間を有する非閉鎖円形断面をなし弾性的に径が縮小可能とされていることを特徴とする。 The invention of claim 1 which solves the above-mentioned problem is used for connecting different diameter pipe welds used when butt welding two steel pipes having different inner diameters such that a step is produced on the inner peripheral surface when they are butted together. A backing ring,
And a small diameter portion 81b to be fitted movably inside surface of the large diameter portion 81a and small-diameter-side steel pipe to be fitted movably inside surface of the inner large-diameter side steel pipe, and concave curvature cross section of the large-diameter portion side as viewed from the tube equal thickness of the step difference portion 81c of the embodiment and the convex curved cross section of the small-diameter portion side is continuous with the interposition together formed by continuously and integrally, non-closing-circular cross-section without elastically to having a gap portion in the circumferential direction The diameter can be reduced.

請求項２は、請求項１記載の裏当てリングが、大径鋼管杭５１（内径大側鋼管）が溶接接続される大径短尺管１３（内径小側鋼管）を円形平板１２の片側面に溶接固定し、小径鋼管杭５２（内径大側鋼管）が溶接接続される小径短尺管１４（内径小側鋼管）を前記円形平板１２の他側面に溶接固定した異径鋼管杭接続部材１０を介して、前記大径鋼管杭５１（内径大側鋼管）と小径鋼管杭５２とを連結する際に用いられる裏当てリングであって、
前記大径鋼管杭５１と前記大径短尺管１３との溶接接続部、又は前記小径鋼管杭５２と前記小径短尺管１４との溶接接続部に用いられるものであることを特徴とする。 In the second aspect, the backing ring according to the first aspect is configured such that the large-diameter short pipe 13 (inner diameter small-side steel pipe) to which the large-diameter steel pipe pile 51 (inner diameter large-side steel pipe) is welded is connected to one side of the circular flat plate 12. welding is fixed, via a different diameter steel pipe piles connecting member 10 which is welded to the other side surface of the small diameter short tube 14 (small-diameter side steel) circular flat plate 12 which diameter steel pipe pile 52 (inner diameter large side steel) is welded connection A backing ring used when connecting the large-diameter steel pipe pile 51 (inner diameter large-side steel pipe) and the small-diameter steel pipe pile 52,
It is used for the welding connection part of the said large diameter steel pipe pile 51 and the said large diameter short pipe 13, or the welding connection part of the said small diameter steel pipe pile 52 and the said small diameter short pipe 14. It is characterized by the above-mentioned.

請求項３は、請求項１記載の裏当てリングが、短い円管部７７とこの円管部７７の下端に固定されて掘削推進力を発揮する構造の掘削推進部７８とを備えた先端部材７０における前記円管部７７と鋼管杭６１の下端とを溶接固定する際に用いられる裏当てリングであって、
前記鋼管杭６１の内面に可動に嵌合する大径部分８１ａと前記先端部材７０の前記円管部７７の内面に可動に嵌合する小径部分８１ｂとが段差部８１ｃを介在させて一体連続してなるとともに、周方向の一部に間隙を有する非閉鎖円形断面をなし弾性的に径が縮小可能とされていることを特徴とする。 A third aspect of the present invention provides a tip member in which the backing ring according to the first aspect includes a short circular pipe portion 77 and an excavation propulsion portion 78 structured to exert excavation propulsion force by being fixed to the lower end of the circular pipe portion 77. A backing ring used when welding and fixing the circular pipe part 77 and the lower end of the steel pipe pile 61 in 70,
A large-diameter portion 81a that is movably fitted to the inner surface of the steel pipe pile 61 and a small-diameter portion 81b that is movably fitted to the inner surface of the circular tube portion 77 of the tip member 70 are integrally and continuously provided with a step portion 81c interposed. In addition, a non- closed circular cross section having a gap in a part in the circumferential direction is formed , and the diameter can be elastically reduced.

鋼管杭において、内径が僅かに異なる２つの鋼管を突合せ溶接する場合に使用可能な裏当てリングを、従来方法と比較して顕著に簡単かつ安価に製作することができる。   In a steel pipe pile, a backing ring that can be used when two steel pipes having slightly different inner diameters are butt welded can be manufactured significantly more easily and inexpensively than the conventional method.

本発明の一実施例の裏当てリングの一実施例を示すもので、（イ）は裏当てリングの側面図、（ロ）は平面図、（ハ）は斜視図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of a backing ring according to an embodiment of the present invention, in which (A) is a side view of the backing ring, (B) is a plan view, and (C) is a perspective view. 図１の裏当てリングを製作する方法を説明する図である。It is a figure explaining the method of manufacturing the backing ring of FIG. 実施例の裏当てリングを用いる場合の一例として示した図９（イ）の鋼管杭の中間において、互いに内径の異なる上下の鋼管杭を異径鋼管杭接続部材を介して連結する部分の断面図である。Sectional view of the middle of the steel pipe pile in FIG 9 shown by way of example (i), linked via a different diameter steel pipe piles connecting member an inner diameter different upper and lower steel pipe piles together portions of the case of using a backing ring of Example It is. 図３における異径鋼管杭接続部材の斜視図であり、上下の鋼管杭を２点鎖線で示している。It is a perspective view of a different diameter steel pipe pile connecting member in FIG. 3 shows the upper and lower steel pipe by a two-dot chain line. 実施例の裏当てリングを用いる場合の他の例として示した図９（ロ）において、上側の細径の鋼管杭５２と下側の拡底杭である鋼管杭５１’とを、異径鋼管杭接続部材を介して連結する部分の断面図である。9 (b) shows another example of the case of using a backing ring embodiment, the steel pipe pile 51 'with a拡底pile of the upper small-diameter steel pipe pile 52 and the lower, different-diameter steel pipe piles It is sectional drawing of the part connected via a connection member. 実施例の裏当てリングを用いる場合のさらに他の例として示した図９（イ）、（ロ）の鋼管杭の先端に固定される先端部材の近傍を示したもので、先端部材近傍の要部断面図（先端部材の端面板は断面として図示していない）である。FIG. 9 (a) and FIG. 9 (b) show the vicinity of the tip member fixed to the tip of the steel pipe pile shown as another example when the backing ring of the embodiment is used. It is a fragmentary sectional view (the end face plate of a tip member is not illustrated as a section). 図６の右側面図に相当する要部断面図である。It is principal part sectional drawing equivalent to the right view of FIG. 図７のＡ−Ａ断面平面図である。It is an AA cross-section top view of FIG. （イ）、（ロ）のいずれも、図１に示した裏当てリングを使用する箇所を説明するための図である。Both (A) and (B) are diagrams for explaining a place where the backing ring shown in FIG. 1 is used.

以下、本発明の異径管溶接接続用の裏当てリングを実施するための形態について、図面を参照して説明する。   Hereinafter, the form for implementing the backing ring for the different diameter pipe welding connection of this invention is demonstrated with reference to drawings.

図１は本発明の一実施例の裏当てリング（リング状の裏当て金）８１の一実施例を示すもので、（イ）は裏当てリング８１の側面図、（ロ）は平面図、（ハ）は斜視図である。
この裏当てリング８１は、突き合わせた時に内周面に段差が生じるような互いに内径の異なる２つの鋼管を突合せ溶接する際に用いられるものであり、図示略の内径大側鋼管の内面に可動に嵌合する大径部分８１ａと図示略の内径小側鋼管の内面に可動に嵌合する小径部分８１ｂとが、管内から見て大径部分側の凹湾曲断面部分と小径部分側の凸湾曲断面部分とが連続する態様の等厚の段差部８１ｃを介在させて一体連続してなるとともに、周方向の一部に切込み（間隙を指す）８１ｄを有する非閉鎖円形断面をなし、弾性的に径が縮小可能とされている構造である。 FIG. 1 shows an embodiment of a backing ring (ring-shaped backing metal) 81 according to an embodiment of the present invention. (A) is a side view of the backing ring 81, (B) is a plan view, (C) is a perspective view.
The backing ring 81 is used when butt welding two steel pipes having different inner diameters that cause a step on the inner peripheral surface when they are butted, and is movable on the inner surface of a large inner diameter steel pipe (not shown). large-diameter portion 81a and a small diameter portion 81b to be fitted movably inside surface of the not shown in small-diameter side steel pipe, concave curvature cross section of the large-diameter portion side as viewed from the tube and the convex curved section of the small diameter portion side to be fitted together portion and is continuously integral with intervening equal thickness of the step difference portion 81c of the mode of continuous, (refer gap) circumferential direction of the part cut forms a non-closed-circular cross-section with a 81d, resiliently It is a structure in which the diameter can be reduced.

この裏当てリング８１は、例えば、板厚ｔの鋼板から切り出した図２（イ）、（ロ）に示すような短冊状の細長いの鋼板ｐをプレス加工して図２（ハ）、（ニ）に示すように段差ｓを付け、この段差付きの鋼板ｐ’を間隙８１ｄが残る態様でリング状に湾曲成形して製作することができる。 The backing ring 81 is formed by, for example, pressing a strip-shaped elongated steel plate p as shown in FIGS. 2 (a) and 2 (b) cut out from a steel plate having a thickness t. ) in stepped s as shown, as possible out be made by curving the stepped steel plates p 'in a ring shape in a manner that gaps 81d remains.

図示例の裏当てリング８１は、例えば図９（イ）に示した鋼管杭６１における異径鋼管杭接続部材１０の部分に用いることができる。図４に異径鋼管杭接続部材１０を斜視図で示す。 Backing ring 81 of the illustrated example, can be used for a portion of different diameter steel pipe piles connecting member 10 in the steel pipe pile 61 shown in example FIG. 9 (b). Figure 4 shows a different diameter steel pipe piles connecting member 10 in a perspective view.

この異径鋼管杭接続部材１０は、杭本体である鋼管を回転圧入することにより地盤に貫入させる回転圧入工法において、例えば図９（イ）、（ロ）に示す互いに径の異なる鋼管杭５１、５２（又は５２’、５１’）を上下に連結する場合に用いることができるが、図３に示した異径鋼管杭接続部材１０は拡頭杭を施工する場合（図９（イ）の場合）のものであり、拡頭杭となる大径鋼管杭５１とその下側の小径鋼管杭５２とを連結するために用いている。
なお、上下の鋼管杭５１、５２からなる鋼管杭全体（施工鋼管杭）を鋼管杭６１として示す。 The different diameter steel pipe pile connecting member 10, pile in rotation pressed method to penetrate the ground by the steel pipe is a body rotates pressed, for example, FIG. 9 (b), different from each other diameters shown in (b) steel pipe pile 51, 52 (or 52 ', 51') if it can be used when connecting the upper and lower, different-diameter steel pipe piles connecting member 10 shown in Figure 3 for applying a拡頭pile (the case of FIG. 9 (b)) It is used to connect a large-diameter steel pipe pile 51 that becomes a head-expanded pile and a small-diameter steel pipe pile 52 below it.
In addition, the whole steel pipe pile (construction steel pipe pile) which consists of the upper and lower steel pipe piles 51 and 52 is shown as the steel pipe pile 61.

この異径鋼管杭接続部材１０は、円形平板１２の上側面に、上側の大径鋼管杭５１が溶接接続される鋼製の大径短尺管１３の管端を内外面とも全周溶接固定し、前記円形平板１２の下側面に、下側の小径鋼管杭５２が溶接接続される鋼製の小径短尺管１４の管端を内外面とも全周溶接固定した構造である。   This different-diameter steel pipe pile connecting member 10 has a pipe end of a steel large-diameter short pipe 13 to which an upper large-diameter steel pipe pile 51 is welded and connected to the upper side surface of a circular flat plate 12 by welding all around the inner and outer surfaces. The pipe end of the steel small-diameter short pipe 14 to which the lower-side small-diameter steel pipe pile 52 is welded and connected to the lower surface of the circular flat plate 12 is welded and fixed all around the inner and outer surfaces.

前記裏当てリング８１は、図３に示すように、上側の大径鋼管杭（内径大側鋼管）５１と大径短尺管（内径小側鋼管）１３の管端とを裏当て金有りの突合せ溶接接続するために用いている。
裏当てリング８１の大径部分８１ａの外径Ｄ６は大径鋼管杭（内径大側鋼管）５１の内径ｄ２より僅かに小径であり（可動に嵌合可能である）、小径部分８１ｂの外径Ｄ７は大径短尺管（（内径小側鋼管）１３の内径ｄ１よりこの実施例では僅かに大径である（緊密に嵌合する。すなわち、切込み８１ｄの存在で弾性的に径が縮小して緊密に嵌合する）。
したがって、この裏当てリング８１の小径部分８１ｂを大径短尺管１３に嵌め込むと、その段差部８１ｃが大径鋼管杭（内径大側鋼管）５１と大径短尺管（内径小側鋼管）１３との間の内面段差部に載る態様で、かつ、小径部分８１ｂが大径短尺管（内径小側鋼管）１３に緊密に嵌合する。
その状態で、異径鋼管杭接続部材１０の大径短尺管１３に大径鋼管杭５１を裏当て金有りの突合せ溶接接続をすることができ、良好な溶接品質を確保することができる。 As shown in FIG. 3, the backing ring 81 butt-joins the upper large diameter steel pipe pile (inner diameter large side steel pipe) 51 and the pipe end of the large diameter short pipe (inner diameter small side steel pipe) 13 with a backing metal. Used for welding connection.
The outer diameter D6 of the large-diameter portion 81a of the backing ring 81 is slightly smaller than the inner diameter d2 of the large-diameter steel pipe pile (inner diameter large-side steel pipe) 51 (it can be movably fitted), and the outer diameter of the small-diameter portion 81b. D7 is slightly larger in diameter than the inner diameter d1 of the large-diameter short pipe ((inner diameter small side steel pipe) 13 (closely fitted. That is, the diameter is elastically reduced in the presence of the notch 81d). Fit tightly).
Therefore, when the small-diameter portion 81 b of the backing ring 81 is fitted into the large-diameter short tube 13, the stepped portion 81 c becomes a large-diameter steel pipe pile (inner diameter large-side steel tube) 51 and a large-diameter short tube (inner-diameter small-side steel tube) 13. The small-diameter portion 81b is closely fitted to the large-diameter short tube (inner diameter small-side steel tube) 13.
In this state, the large-diameter steel pipe pile 51 can be butt-welded with the backing metal to the large-diameter short pipe 13 of the different-diameter steel pipe pile connecting member 10, and good welding quality can be ensured.

なお、図示例の場合（大径短尺管１３を上側として用いる場合）は、裏当てリング８１の段差部８１ｃが大径鋼管杭（内径大側鋼管）５１と大径短尺管（内径小側鋼管）１３との段差部に当たるので、裏当てリング８１の小径部分８１ｂは大径短尺管１３に必ずしも緊密の嵌合しなくてもよい。   In the case of the illustrated example (when the large-diameter short pipe 13 is used as the upper side), the stepped portion 81c of the backing ring 81 has a large-diameter steel pipe pile (inner diameter large-side steel pipe) 51 and a large-diameter short pipe (inner-diameter small-side steel pipe). ) 13, the small-diameter portion 81 b of the backing ring 81 may not necessarily be closely fitted to the large-diameter short tube 13.

同じ図３において、小径鋼管杭（内径大側鋼管）５２に異径鋼管杭接続部材１０の小径短尺管（内径小側鋼管）１４を溶接接続する際に用いる裏当てリング８１’として説明すると（図示の裏当てリング８１’は上下逆の姿勢となる）、その大径部分８１ａの外径Ｄ６は小径鋼管杭（内径大側鋼管）５２の内径ｄ４より僅かに小径であり、小径部分８１ｂの外径Ｄ７は小径短尺管（内径小側鋼管）１４の内径ｄ３より僅かに大径である（緊密に嵌合する。すなわち、切込み８１ｄの存在で弾性的に径が縮小して緊密に嵌合する）。なお、裏当てリング８１の大径部分８１ａの外径Ｄ６は、切込み８１ｄにより縮径できるので、必ずしも小径鋼管杭（内径大側鋼管）５２の内径ｄ４より小径にしなくてもよい
この場合は、予め裏当てリング８１’の小径部分８１ｂを異径鋼管杭接続部材１０の小径短尺管（内径小側鋼管）１４の内面に嵌め込んでおく。前述の通り、小径部分８１ｂが切込み８１ｄの存在で弾性的に径が縮小して小径短尺管（内径小側鋼管）１４の内面に緊密に嵌合するので、下向き開口の小径短尺管１４内に弾性的に保持されている（落下しない）。
その状態で、小径短尺管１４に弾性的に取り付けられた裏当てリング８１’の大径部分８１ａを小径鋼管杭（内径大側鋼管）５２内に挿入して小径短尺管１４の下端面と小径鋼管杭５２の上端面とを突き合わせることで、小径短尺管１４と小径鋼管杭５２とを裏当て金有りの突合せ溶接接続をすることができる。
In the same Figure 3, will be described as a backing ring 81 'is used small diameter short tube of a different diameter steel pipe piles connecting member 10 to the small-diameter steel pipe pile (inner diameter large side steel) 52 (small-diameter side steel pipe) 14 when the welded connection ( The illustrated backing ring 81 ′ is upside down), and the outer diameter D 6 of the large diameter portion 81 a is slightly smaller than the inner diameter d 4 of the small diameter steel pipe pile (inner diameter large side steel pipe) 52. The outer diameter D7 is slightly larger than the inner diameter d3 of the small-diameter short pipe (inner diameter small-side steel pipe) 14 (tightly fitting. In other words, the diameter is elastically reduced by the presence of the notch 81d and tightly fitting. To do). Note that the outer diameter D6 of the large-diameter portion 81a of the backing ring 81 can be reduced by the notch 81d, so it is not always necessary to make the diameter smaller than the inner diameter d4 of the small-diameter steel pipe pile (inner diameter large-side steel pipe) 52. The small diameter portion 81 b of the backing ring 81 ′ is fitted in advance on the inner surface of the small diameter short pipe (inner diameter small side steel pipe) 14 of the different diameter steel pipe pile connecting member 10. As described above, the small-diameter portion 81b is elastically reduced in diameter due to the presence of the notch 81d and tightly fits to the inner surface of the small-diameter short tube (inner diameter small-side steel tube) 14. It is held elastically (does not fall).
In this state, the large-diameter portion 81a of the backing ring 81 'elastically attached to the small-diameter short tube 14 is inserted into the small-diameter steel pipe pile (inner diameter large-side steel tube) 52, and the lower end surface of the small-diameter short tube 14 and the small-diameter By abutting the upper end surface of the steel pipe pile 52, the small diameter short pipe 14 and the small diameter steel pipe pile 52 can be butt-welded with a backing metal.

図５は前記異径鋼管杭接続部材１０を上下逆にして用いる場合の裏当てリング８１の使用状態を示す。すなわち、図９（ロ）のように、上側の小径鋼管杭５２’と下側の大径鋼管杭５１’とを異径鋼管杭接続部材１０を介して連結する場合であり、拡底杭（大径鋼管杭５１’）を持つ鋼管杭６１（６１Ａ）が施工される。
この場合、上側の小径鋼管杭５２’と異径鋼管杭接続部材１０の小径短尺管１４との溶接接続において、又は拡底杭である下側の内径大側鋼管５１’と異径鋼管杭接続部材１０の大径短尺管１３との溶接接続において、図３で説明した要領と同様な要領で、裏当てリング８１を用いることができる。 FIG. 5 shows a usage state of the backing ring 81 when the different diameter steel pipe pile connecting member 10 is used upside down. That is, as shown in FIG. 9 (b), the upper small-diameter steel pipe pile 52 ′ and the lower large-diameter steel pipe pile 51 ′ are connected via the different-diameter steel pipe pile connecting member 10. A steel pipe pile 61 (61A) having a diameter steel pipe pile 51 ') is constructed.
In this case, the upper 'at the weld connection between the small diameter short tube 14 of different diameter steel pipe piles connecting member 10, or under the inner diameter large side steel pipe 51 is拡底pile' diameter steel pipe 52 with different diameter steel pipe piles connecting member In the welding connection with the 10 large-diameter short tubes 13, the backing ring 81 can be used in the same manner as described in FIG.

上述の裏当てリング８１は、図９（イ）、（ロ）に示した鋼管杭６１（６１Ａ）の先端に取り付けられて、回転により推進力を発揮する先端部材７０の部分にも適用することができる。
図９（イ）における先端部材７０として説明すると、この先端部材７０は、図６〜図８に示すように、短い円管部７７とこの円管部７７の下端に固定されて掘削推進力を発揮する掘削推進部７８とを備えている。
掘削推進部７８は、円板から製作される端面板７１とその下面中央に垂直に溶接固定された先端の尖った板状の掘削刃７２を備えている。
前記端面板７１は前記円管部７７の外周面より外側部分である鍔部７３に、互いに上下逆向きに傾斜した傾斜面部、すなわち上向きに傾斜した傾斜面部７４及び下向きに傾斜した傾斜面部７５を有している。端面板７１のこの上下逆向きに傾斜した傾斜面部７４、７５が回転圧入時の回転により推進力を発揮する。また、この先端部材７０の端面板７１はその中心部に円形の中心穴７６を有している。
前記掘削刃７２は、端面板側（端面板７１に溶接固定される側）に、互いに平行な両辺７２ａを有しその先端側部分７２ｂが三角形状である五角形家形をなしており、端面板７１の前記中心穴７６に臨んで開口する切欠き７２ｃを有している。この実施例の切欠７２ｃの形状（内縁形状）は、幅が中心穴７６の直径と同寸法であり、掘削刃７２の全体輪郭である五角形と概ね相似の五角形をなしている。
この先端部材７０によれば、端面板７１の中心部にあけた中心穴７６と掘削刃７２側に形成した切欠き７２ｃとが、相互に影響し合い協働して作用し、圧抜きの作用を損なうことなく、掘削土が管内に侵入することによる一定の閉塞効果を奏して支持力を確保できる。 The above-described backing ring 81 is also applied to a portion of the tip member 70 that is attached to the tip of the steel pipe pile 61 (61A) shown in FIGS. Can do.
9A, the tip member 70 is fixed to a short circular pipe portion 77 and the lower end of the circular pipe portion 77 to provide excavation propulsion force, as shown in FIGS. And an excavation propulsion unit 78 to be exhibited.
The excavation propulsion unit 78 includes an end face plate 71 made of a disc and a plate-like excavation blade 72 having a sharp tip that is welded and fixed perpendicularly to the center of the lower face thereof.
The end face plate 71 has an inclined surface portion inclined in the upside down direction, that is, an inclined surface portion 74 inclined upward and an inclined surface portion 75 inclined downward, on the flange portion 73 which is an outer portion of the outer peripheral surface of the circular pipe portion 77. Have. The inclined surface portions 74 and 75 of the end face plate 71 inclined in the upside down direction exert a propulsive force by the rotation at the time of the rotation press-fitting. Further, the end face plate 71 of the tip member 70 has a circular center hole 76 at the center thereof.
The excavating blade 72 has a pentagonal house shape having both sides 72a parallel to each other on the end face plate side (side fixed to the end face plate 71 by welding), and a tip end portion 72b having a triangular shape. 71 has a notch 72c that opens to face the central hole 76. The shape (inner edge shape) of the notch 72c of this embodiment has the same width as the diameter of the center hole 76, and forms a pentagon that is substantially similar to the pentagon that is the entire outline of the excavating blade 72.
According to the tip member 70, the center hole 76 formed in the center portion of the end face plate 71 and the notch 72c formed on the excavating blade 72 side influence each other and act in cooperation, and the action of pressure release. Without sacrificing, it is possible to secure a supporting force with a certain blocking effect due to the excavated soil entering the pipe.

この先端部材７０を鋼管杭６１の下端に裏当てリング８１を用いて溶接固定する場合、裏当てリング８１を、その段差部８１ｃが先端部材７０の円管部（内径小側鋼管）７７の上端に載る態様で円管部７７の内面に嵌め込んでおく。なお、裏当てリング８１はその小径部分８１ｂの外径を、前記円管部７７の内径より僅かに大径にしており、裏当てリング８１の小径部分８１ｂを縮小した状態（切込み８１ｄの幅を狭くした状態）で円管部７７に嵌め込み、開放させた時に弾性的に径が拡大して緊密に嵌合するので、前記段差部８１ｃが円管部７７の上端面に載ることと相俟って、円管部７７の上端部に安定して保持される。
その状態で鋼管杭（内径大側鋼管）６１を、裏当てリング８１の大径部分８１ａに被せるようにして円管部７７の上端面に載せる（必要があれば裏当てリング８１の大径部分８１ａを絞って載せる）と、裏当てリング８１が裏当て金として機能する状態となる。
これにより鋼管杭６１と円管部７７とを良好な裏当て金有りの溶接接続をすることができる。 When the tip member 70 is welded and fixed to the lower end of the steel pipe pile 61 using the backing ring 81, the stepped portion 81 c of the backing ring 81 is the upper end of the circular pipe portion (small inner diameter steel pipe) 77 of the tip member 70. It fits in the inner surface of the circular pipe part 77 in the aspect mounted on. Note that the outer diameter of the small diameter portion 81b of the backing ring 81 is slightly larger than the inner diameter of the circular tube portion 77, and the small diameter portion 81b of the backing ring 81 is reduced (the width of the notch 81d is reduced). In the narrowed state), the diameter is elastically enlarged and tightly fitted when released into the circular pipe portion 77, so that the stepped portion 81c is placed on the upper end surface of the circular pipe portion 77. Thus, it is stably held at the upper end portion of the circular pipe portion 77.
In this state, the steel pipe pile (inner diameter large side steel pipe) 61 is placed on the upper end surface of the circular pipe portion 77 so as to cover the large diameter portion 81a of the backing ring 81 (if necessary, the large diameter portion of the backing ring 81). When the 81a is squeezed and placed), the backing ring 81 functions as a backing metal.
Thereby, the steel pipe pile 61 and the circular pipe part 77 can be welded with a good backing metal.

実施例では、裏当てリング８１を異径鋼管杭接続部材１０、及び先端部材７０において適用する実施例について説明したが、その他、突き合わせた時に内周面に段差が生じるような互いに内径の異なる２つの鋼管を溶接接続する場合に適用できる。 In an embodiment, different diameter backing ring 81 steel pipe connecting member 10, and have been described for Example to be applied in the tip member 70, other, different from each other inside diameter as the step on the inner peripheral surface occurs when the butt 2 Applicable when two steel pipes are welded together.

１０ 異径鋼管杭接続部材
１２ 円形平板
１３ 大径短尺管（内径小側鋼管）
１４ 小径短尺管（内径小側鋼管）
５１、５１’ 大径鋼管杭（内径大側鋼管）
５２、５２’ 小径鋼管杭（内径大側鋼管）
６１、６１Ａ 鋼管杭（軸部）
７０ 先端部材
７１ 端面板
７２ 掘削刃
７３ （端面板の）鍔部
７４ （上向き傾斜の）傾斜面部
７５ （下向き傾斜の）傾斜面部
７６ 中心孔
７７ 円管部（内径小側鋼管）
７８ 掘削推進部
８１、８１’ 裏当てリング
８１ａ 大径部分
８１ｂ 小径部分
８１ｃ 段差部分
８１ｄ 切込み
ｐ 鋼板
ｐ’ 段差付き鋼板 10 Different Diameter Steel Pipe Pile Connection Member 12 Circular Flat Plate 13 Large Diameter Short Pipe (Inner Diameter Small Side Steel Pipe)
14 Small diameter short pipe (Inner diameter small side steel pipe)
51, 51 'Large diameter steel pipe pile (Inner diameter large side steel pipe)
52, 52 'Small diameter steel pipe pile (Inner diameter large side steel pipe)
61, 61A Steel pipe pile (shaft)
70 Tip member 71 End face plate 72 Excavation blade 73 (End face plate) ridge 74 (Inclined upward) Inclined surface part 75 (Inclined downward) Inclined surface part 76 Center hole 77 Circular pipe part (inner diameter small side steel pipe)
78 Excavation propulsion part 81, 81 'Backing ring 81a Large diameter part 81b Small diameter part 81c Step part 81d Cutting p Steel sheet p' Steel sheet with step

Claims (3)

鋼管杭において、突き合わせた時に内周面に段差が生じるような互いに内径の異なる２つの鋼管を突合せ溶接する際に用いられる異径管溶接接続用の裏当てリングであって、
内径大側鋼管の内面に可動に嵌合する大径部分８１ａと内径小側鋼管の内面に可動に嵌合する小径部分８１ｂとが、管内から見て大径部分側の凹湾曲断面部分と小径部分側の凸湾曲断面部分とが連続する態様の等厚の段差部８１ｃを介在させて一体連続してなるとともに、周方向の一部に隙間を有する非閉鎖円形断面をなし弾性的に径が縮小可能とされていることを特徴とする異径管溶接接続用の裏当てリング。 In a steel pipe pile, a backing ring for different diameter pipe welding connection used when butt welding two steel pipes having different inner diameters such that a step occurs on the inner peripheral surface when they are butted,
And a small diameter portion 81b to be fitted movably inside surface of the large diameter portion 81a and small-diameter-side steel pipe to be fitted movably inside surface of the inner large-diameter side steel pipe, and concave curvature cross section of the large-diameter portion side as viewed from the tube equal thickness of the step difference portion 81c of the embodiment and the convex curved cross section of the small-diameter portion side is continuous with the interposition together formed by continuously and integrally, non-closing-circular cross-section without elastically to having a gap portion in the circumferential direction A backing ring for connecting different diameter pipes with a reduced diameter. 大径鋼管杭５１が溶接接続される大径短尺管１３を円形平板１２の片側面に溶接固定し、小径鋼管杭５２が溶接接続される小径短尺管１４を前記円形平板１２の他側面に溶接固定した異径鋼管杭接続部材１０を介して、前記大径鋼管杭５１と小径鋼管杭５２とを連結する際に用いられる裏当てリングであって、
前記大径鋼管杭５１と前記大径短尺管１３との溶接接続部、又は前記小径鋼管杭５２と前記小径短尺管１４との溶接接続部に用いられるものであることを特徴とする請求項１記載の異径管溶接接続用の裏当てリング。 The large-diameter short pipe 13 to which the large-diameter steel pipe pile 51 is connected by welding is fixed to one side of the circular flat plate 12 by welding, and the small-diameter short pipe 14 to which the small-diameter steel pipe pile 52 is connected by welding is welded to the other side of the circular flat plate 12. A backing ring used when connecting the large-diameter steel pipe pile 51 and the small-diameter steel pipe pile 52 through the fixed different-diameter steel pipe pile connecting member 10,
2. The welding connection portion between the large-diameter steel pipe pile 51 and the large-diameter short pipe 13 or the welding connection portion between the small-diameter steel pipe pile 52 and the small-diameter short pipe 14 is used. The backing ring for connecting different diameter pipes as described. 短い円管部７７とこの円管部７７の下端に固定されて掘削推進力を発揮する構造の掘削推進部７８とを備えた先端部材７０における前記円管部７７と鋼管杭６１の下端とを溶接固定する際に用いられる裏当てリングであって、
前記鋼管杭６１の内面に可動に嵌合する大径部分８１ａと前記先端部材７０の前記円管部７７の内面に可動に嵌合する小径部分８１ｂとが段差部８１ｃを介在させて一体連続してなるとともに、周方向の一部に隙間を有する非閉鎖円形断面をなし弾性的に径が縮小可能とされていることを特徴とする請求項１記載の異径管溶接接続用の裏当てリング。 The circular pipe part 77 and the lower end of the steel pipe pile 61 in the tip member 70 having a short circular pipe part 77 and an excavation propulsion part 78 structured to exert excavation propulsion force fixed to the lower end of the circular pipe part 77 are provided. A backing ring used for fixing by welding,
A large-diameter portion 81a that is movably fitted to the inner surface of the steel pipe pile 61 and a small-diameter portion 81b that is movably fitted to the inner surface of the circular tube portion 77 of the tip member 70 are integrally and continuously provided with a step portion 81c interposed. 2. The backing ring for connecting different diameter pipes according to claim 1, wherein the backing ring has a non-closed circular cross section having a gap in a circumferential direction, and the diameter can be elastically reduced. .
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