JP4075623B2

JP4075623B2 - Steel pipe joining structure and joining method

Info

Publication number: JP4075623B2
Application number: JP2003015114A
Authority: JP
Inventors: 公寿高野; 慎司堀川; 陽登志豊原; 夕一辰見
Original assignee: JFE Steel Corp
Current assignee: JFE Steel Corp
Priority date: 2003-01-23
Filing date: 2003-01-23
Publication date: 2008-04-16
Anticipated expiration: 2023-01-23
Also published as: JP2004225393A

Description

【０００１】
【発明の属する技術分野】
本発明は、鋼管杭の接合構造及び接合方法に関すものである。
【０００２】
【従来の技術】
従来、鋼管杭の接合には、施工現場における溶接接合が広く用いられてきた。
しかしながら、鋼管の径が大きくなり肉厚が厚くなると、溶接に時間がかかるという問題が顕在化し、結果として溶接コストの問題や杭打ち機械の待機時間が長くなるため施工工期が長くなるという問題があり、また、溶接部の品質が溶接工の技量に左右されることなどから、溶接に代わる接合方法の開発が望まれている。
【０００３】
溶接に代わる鋼管の接合方法として、接続する鋼管杭の突き合わせ端縁部にこの鋼管杭の径より小さい外径の円筒状接続部を固定し、この円筒状接続部の側面上にネジ孔を設けてこの円筒状接続部を突き合わせ、これらの円筒状接続部の外周を、円弧状に分割されボルト挿通孔を穿った分割円筒状継手で被い、この分割円筒状継手の各ボルト挿通孔と上記各ネジ孔を合わせ、これらにボルトを通して締め付けることによって上記鋼管杭同士を接続し、上記円筒状接続部に固定された各分割円筒状継手及び各ボルトは上記接続する鋼管杭の外径より突出しないようにしたものである。
また、これらのネジ孔に続く円筒状接続部の外面には、環状凹凸部が設けられ、この環状凹凸部は分割円筒状継手の内面に設けられた凹凸部と係止して応力伝達を効果的にしたものがある（例えば、特許文献１参照）。
【０００４】
【特許文献１】
特開平１１−８１３０４号公報（第２−３頁、図１）
【０００５】
【発明が解決しようとする課題】
しかしながら、特許文献１に記載の鋼管の接続構造には以下のような問題がある。
（１）円筒状接続部の外周に分割円筒状継手を鋼管杭の外径より突出しないようにボルト接合するためには、円筒状接続部における分割円筒状継手の取付部を内側に凹ます必要があり、そのため円筒状接続部が断面で見たときに屈曲した形状となり、強度上問題がある。
（２）上記継手構造においては建設現場において分割円筒状継手を保持しながらボルト接合する必要があるが、どのような手段で保持するかに関しては記載がない。仮に人力で保持するとすれば安全上望ましくないのは言うまでもなく、また人力で保持できるような大きさに分割する必要も生じ、大径、肉厚の鋼管杭の場合には分割数が多くなり、現場での作業性を含めた継手費用が高くなるという問題がある。
【０００６】
本発明は、上記の課題を解決するためになされたもので、接合強度が大で現場継ぎ施工が容易であり、杭打設時の貫入抵抗の小さい鋼管杭用の鋼管の接合構造及び接合方法を提供することを目的としたものである。
【０００７】
【課題を解決するための手段】
（１）本発明に係る鋼管の接合構造は、外径が接合される鋼管の外径とほぼ等しく、内周面に先端部になるにしたがって内径が大きくなる環状の凹凸部が階段状に設けられ、前記鋼管の端部にそれぞれ接合される外側継手管と、該両外側継手管の先端どうしを当接したときに両者の内周面に亘って配設され、外周面に前記外側継手管の凹凸部に対応して軸方向の中央部が大径で両端部になるにしたがって小径になる凹凸部が設けられた複数の円弧状部材とを有し、前記外側継手管の内周部に前記凹凸部が互いに嵌合するように前記円弧状部材を配設して両者を結合することにより、前記２本の鋼管を接合するようにしたものである。
【０００８】
（２）上記（１）の外側継手管の内周部に、施工時に前記円弧状部材を仮保持する張出し段部を設けた。
【０００９】
（３）上記（１）又は（２）の外側継手管又は円弧状部材の材料強度を他の部材より大きくし、あるいは外側継手管及び円弧状部材の材料強度を、前記鋼管の材料強度より大きくした。
【００１０】
（４）また、本発明に係る鋼管の接合方法は、上記（１）の外側継手管を第１，第２の鋼管の先端部に接合する工程と、前記第１の鋼管に接合された外側継手管の内面側に上記（１）の円弧状部材を配設してボルトにより仮止めする工程と、前記第２の鋼管に接合された外側継手管を前記円弧状部材に嵌装してその先端部を前記第１の鋼管に接合された外側継手管の先端部に当接する工程と、前記第１，第２の鋼管に接合された外側継手管の凹凸部と前記円弧状部材の凹凸部とを嵌合させると共に、ボルトにより両者を固定する工程とを含むものである。
【００１１】
【発明の実施の形態】
図１は本発明の一実施の形態に係る鋼管の接合構造の模式的説明図、図２は図１の左半分の分解図である。
本発明は、接合する上下の鋼管１，２の端部にそれぞれ円筒状の外側継手管１０ａ，１０ｂを溶接により接合し、この外側継手管１０ａ，１０ｂを突き合わせた状態で、外側継手管１０ａ，１０ｂの内周部に、両外側継手管１０ａ，１０ｂに亘って配設された複数の円弧状部材２０をボルト３０により結合して、上下の鋼管１，２を一体に接合するようにしたものである。
【００１２】
外側継手管１０ａ，１０ｂは接合する鋼管１，２とほぼ同じ強度で、その外径が鋼管１，２の外径とほぼ等しい円筒体によって形成されている。そして、内周面には全周に亘って環状の凹凸部１１ａ，１１ｂが形成されており、凹部の内径は先端部に近いものが大きく、基端部（鋼管１，２側）に向って順次小さく、また、凸部の内径も同様に先端部側が大きく、基端部に向って順次小さく形成されている。
【００１３】
また、一方の外側継手管１０ａの基端部側の内周面には、基端部側の最小内径の凸部よりさらに小径の張出し段部１２が設けられており、他方の外側継手管１０ｂの基端部側にも張出し部１３が形成されている。１４ａ，１４ｂは両外側継手管１０ａ，１０ｂの基端部近傍の周面に設けられた複数のボルト挿通穴で、ボルトの頭部が挿入される大径部と、ねじ部が挿入される小径部とからなっている。
【００１４】
円弧状部材２０は、外側継手管１０ａ，１０ｂを突き合わせたときの張出し段部１２の上面と張出し部１３の下面との間の高さに対応した高さで、外側継手管１０ａ，１０ｂとほぼ等しい材料強度の円筒体を、周方向に複数に分割したもので、図には４分割した場合が示してあるが、これに限定するものではない。
この円弧状部材２０の内径は、外側継手管１０ａの張出し段部１２の内径とほぼ等しく、外周面には軸方向の中央部が大径で、両端部に向って順次小径になる、外側継手管１０ａ，１０ｂの内周面に設けた凹凸部１１ａ，１１ｂに対応する凹凸部２１が形成されている。
【００１５】
２２ａ，２２ｂは上下の端部近傍において、外側継手管１０ａ，１０ｂのボルト挿通穴１４ａ，１４ｂに対応して設けられたねじ穴である。
３０はボルトで、図３に示すように、頭部３１とねじ部３２とからなり、頭部３１には六角穴３３が設けられている。
なお、上記の説明では、外側継手管１０ａ，１０ｂの内周面に設けた凹凸部１１ａ，１１ｂ、円弧状部材２０の外周面に設けた凹凸部２１を環状に形成した場合を示したが、断続的に形成してもよい。
【００１６】
次に、本発明を鋼管杭の接合に実施した場合の施工手順の一例について説明する。なお、あらかじめ工場等において接合対象である鋼管杭の端部に、それぞれ外側継手管１０ａ，１０ｂが溶接されており、これら鋼管杭、円弧状部材２０、ボルト３０等が工事現場に輸送されているものとする。
【００１７】
先ず、図４（ａ）に示すように、外側継手管１０ａが接続されている鋼管杭１ａを地中に打込む。打込みが進んで上部の鋼管杭２ａを接続する状態になったときは、図４（ｂ）に示すように、外側継手管１０ａ内にその下端部を張出し段部１２上に位置させて円弧状部材２０を配設し、ボルト挿通穴１４ａから挿通したボルト３０をねじ穴２２ａに螺入して仮止めする。このとき、外側継手管１０ａの内周面と円弧状部材２０の外周面との間には、鋼管杭２ａの外側継手管１０ｂを挿入し易いように若干のすき間を設けておく。
【００１８】
この状態で、図４（ｃ）に示すように、上側の鋼管杭２ａを下降させ、これに接合した外側継手管１０ｂを円弧状部材２０の外周に嵌装し、図５（ａ）に示すように、その下端部を外側継手管１０ａの上端部に当接させる。
【００１９】
ついで、図５（ｂ）に示すように、外側継手管１０ａのボルト挿通穴１４ａから円弧状部材２０のねじ穴２２ａに螺入したボルト３０を更に螺入し、円弧状部材２０を張出し段部１３に沿って移動させると共に、外側継手管１０ｂのボルト挿通穴１４ｂに挿入したボルト３０を円弧状部材２０のねじ穴２２ｂに螺入する。これにより、張出し段部１２と張出し部１３との間に引き込まれた円弧状部材２０は、その凹凸部２１が外側継手管１０ａ，１０ｂの凹凸部１１ａ，１１ｂに嵌合する。
そして、図５（ｃ）に示すように、上下のボルト３０をさらに締付けることにより、上下の鋼管杭１ａ，２ａは外側継手管１０ａ，１０ｂ及び複数の円弧状部材２０を介して強固に接合される。
【００２０】
このようにして接合された鋼管杭１ａ，２ａの接合部分の応力は、圧縮力に対しては外側継手管１０ａ，１０ｂの当接面で抵抗する。また、引張力に対しては外側継手管１０ａ，１０ｂの内面に設けた凹凸部１１ａ，１１ｂと、円弧状部材２０の外面に設けた凹凸部２１ａ，２１ｂの剪断、支圧で抵抗する。さらに、曲げ力に対しては、最大応力となる箇所の応力的性状が圧縮力と引張力と同じであるため、圧縮力と引張力と同様な機構で抵抗する。
【００２１】
以上のように、本発明においては、外側継手管１０ａ，１０ｂの外径を接合する鋼管杭１ａ，２ａの外径とほぼ等しくし、円弧状部材２０を外側継手管の内側に配置するようにしたので、接合部が鋼管杭１ａ，２ａの外側に出張ることがなく、このため地中への貫入抵抗を小さくすることができる。
また、施工にあたっては、円弧状部材２０の下端部を外側継手管１０ａの張出し段部１２上に載置してボルト３０により仮り止めするようにしたので、円弧状部材２０を別途保持する必要がなく、作業性を向上することができる。
【００２２】
さらに、従来技術に比べて接合部の厚さを薄くできるので杭内空間を確保することができ、このため、従来では対応できなった板厚の鋼管杭を中掘り工法で施工することが可能となった。また、同様に、地すべり抑止鋼管杭では、杭内空間に配置するモルタル注入管を容易に設置できるようになり、従来では対応できなかった板厚の地すべり抑止鋼管杭を施工することが可能になった。
【００２３】
上記の説明では、外側継手管１０ａ，１０ｂ及び円弧状部材２０を、鋼管１，２とほぼ等しい材料強度の円筒体又は円筒体を周方向に分割して形成した場合を示したが、外側継手管１０ａ，１０ｂの材料強度を鋼管１，２及び円弧状部材２０の材料強度より大きい材料で形成し、又は円弧状部材２０の材料強度を鋼管１，２及び外側継手管１０ａ，１０ｂの材料強度より大きい材料で形成してもよく、さらには、外側継手管１０ａ，１０ｂ及び円弧状部材２０の材料強度を鋼管１，２の材料強度より大きい材料で構成してもよい。
このように構成することにより、外側継手管１０ａ，１０ｂ及び円弧状部材２０の両者又は何れか一方の肉厚を薄くすることができ、これにより鋼管内空間を大きく保つことができる。
【００２４】
上記の説明では、本発明に係る接合構造を鋼管杭の継手として用いた場合を示しが、本発明はこれに限定するものではなく、杭以外の鋼管を接合する場合にも実施することができる。
【００２５】
【発明の効果】
本発明は、外径が接合される鋼管の外径とほぼ等しく、内周面に先端部になるにしたがって内径が大きくなる凹凸部が設けられ、前記鋼管の端部にそれぞれ接合される外側継手管と、外周に前記凹凸部に対応する凹凸部が設けられた複数の円弧状部材とを有し、円弧状部材を外側継手管の内周面に配置してボルトで結合し、前記凹凸部を互いに嵌合させて鋼管を接合するようにしたので、接合強度が大で現場継ぎ施工が容易であり、杭打設時の貫入抵抗の小さい鋼管杭用の鋼管の接合構造及び接合方法を得ることができる。
【図面の簡単な説明】
【図１】本発明の一実施の形態に係る鋼管の接合構造の模式的説明図である。
【図２】図１の左半分の分解図である。
【図３】図１のボルトの斜視図である。
【図４】本実施の形態の施工手順の一例の説明図である。
【図５】本実施の形態の施工手順の一例の説明図である。
【符号の説明】
１，２鋼管
１０ａ，１０ｂ外側継手管
１１ａ，１１ｂ凹凸部
１２張出し段部
１４ａ，１４ｂボルト挿通穴
２０円弧状部材
２１凹凸部
２２ａ，２２ｂねじ穴
３０ボルト[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a joining structure and joining method for steel pipe piles.
[0002]
[Prior art]
Conventionally, welding joining at construction sites has been widely used for joining steel pipe piles.
However, when the diameter of the steel pipe increases and the wall thickness increases, the problem that welding takes time becomes obvious, and as a result, the problem of welding cost and the waiting time of the pile driving machine become longer, so the construction period becomes longer. In addition, since the quality of the welded part depends on the skill of the welder, development of a joining method that replaces welding is desired.
[0003]
As a steel pipe joining method instead of welding, a cylindrical connection part having an outer diameter smaller than the diameter of the steel pipe pile is fixed to the butt edge of the steel pipe pile to be connected, and a screw hole is provided on the side surface of the cylindrical connection part. The cylindrical connecting portions are abutted, and the outer circumferences of these cylindrical connecting portions are covered with a divided cylindrical joint divided into an arc shape and having bolt insertion holes, and each bolt insertion hole of the divided cylindrical joint and the above-mentioned The steel pipe piles are connected to each other by aligning the screw holes and tightening them with bolts, and the divided cylindrical joints and bolts fixed to the cylindrical connecting portion do not protrude from the outer diameter of the steel pipe pile to be connected. It is what I did.
In addition, an annular concavo-convex portion is provided on the outer surface of the cylindrical connecting portion following these screw holes, and this annular concavo-convex portion is engaged with the concavo-convex portion provided on the inner surface of the split cylindrical joint to effect stress transmission. (For example, refer to Patent Document 1).
[0004]
[Patent Document 1]
JP-A-11-81304 (page 2-3, FIG. 1)
[0005]
[Problems to be solved by the invention]
However, the steel pipe connection structure described in Patent Document 1 has the following problems.
(1) To attach the split cylindrical joint to the outer periphery of the cylindrical connection part so that it does not protrude from the outer diameter of the steel pipe pile, it is necessary to dent the mounting part of the split cylindrical joint inside the cylindrical connection part. Therefore, the cylindrical connecting portion has a bent shape when viewed in cross section, and there is a problem in strength.
(2) In the above joint structure, it is necessary to join the bolt while holding the split cylindrical joint at the construction site, but there is no description as to what means is used to hold it. Needless to say, if it is held by human power, it is not desirable for safety, and it is also necessary to divide it into a size that can be held by human power, and in the case of large diameter, thick steel pipe piles, the number of divisions increases. There is a problem that the cost of joints including on-site workability becomes high.
[0006]
The present invention was made in order to solve the above-described problems, and has a high joining strength, is easy to perform on-site jointing, and has a low penetration resistance at the time of pile driving. Is intended to provide.
[0007]
[Means for Solving the Problems]
Joint structure of a steel pipe according to (1) the present invention is approximately equal to the outer diameter of the steel pipe having an outer diameter is bonded to the inner circumferential surface inside diameter with increasing the tip size Kunar annular uneven portions are stepped An outer joint pipe that is joined to each end of the steel pipe and the inner joint surfaces of the outer joint pipes when the tips of the outer joint pipes are brought into contact with each other. A plurality of arc-shaped members provided with concave and convex portions that have a large diameter at the central portion in the axial direction corresponding to the concave and convex portions of the pipe and become smaller in diameter as both ends thereof, and an inner peripheral portion of the outer joint pipe The two steel pipes are joined by disposing the arcuate member so that the concavo-convex portions are fitted to each other and joining them together.
[0008]
(2) An overhanging step portion for temporarily holding the arcuate member during construction was provided on the inner peripheral portion of the outer joint pipe of (1).
[0009]
(3) The material strength of the outer joint pipe or arcuate member of the above (1) or (2) is made larger than that of other members, or the material strength of the outer joint pipe and arcuate member is made larger than the material strength of the steel pipe. did.
[0010]
(4) Moreover, the joining method of the steel pipe which concerns on this invention is the outer side joined to the process of joining the outer joint pipe of said (1) to the front-end | tip part of a 1st, 2nd steel pipe, and the said 1st steel pipe. The step of disposing the arc-shaped member (1) on the inner surface side of the joint pipe and temporarily fixing it with a bolt; and fitting the outer joint pipe joined to the second steel pipe to the arc-shaped member A step of abutting the distal end portion with the distal end portion of the outer joint pipe joined to the first steel pipe; an uneven portion of the outer joint pipe joined to the first and second steel pipes; and an uneven portion of the arcuate member And a step of fixing both of them with bolts.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a schematic explanatory view of a steel pipe joining structure according to an embodiment of the present invention, and FIG. 2 is an exploded view of the left half of FIG.
In the present invention, cylindrical outer joint pipes 10a and 10b are joined to the ends of upper and lower steel pipes 1 and 2 to be joined by welding, and the outer joint pipes 10a and 10b are abutted against each other. A plurality of arc-shaped members 20 disposed across the outer joint pipes 10a and 10b are joined to the inner peripheral part of 10b by bolts 30 so that the upper and lower steel pipes 1 and 2 are joined together. It is.
[0012]
The outer joint pipes 10a and 10b are formed of a cylindrical body having substantially the same strength as the steel pipes 1 and 2 to be joined and having an outer diameter substantially equal to the outer diameter of the steel pipes 1 and 2. And the annular uneven | corrugated | grooved part 11a, 11b is formed in the inner peripheral surface over the perimeter, and the inside diameter of a recessed part has a thing close | similar to a front-end | tip part, and toward a base end part (steel pipe 1, 2 side). Similarly, the inner diameter of the convex portion is similarly large at the distal end side, and is gradually smaller toward the base end portion.
[0013]
Further, a protruding step portion 12 having a smaller diameter than the convex portion having the smallest inner diameter on the base end side is provided on the inner peripheral surface on the base end portion side of one outer joint pipe 10a, and the other outer joint pipe 10b. An overhang portion 13 is also formed on the base end side. Reference numerals 14a and 14b denote a plurality of bolt insertion holes provided on the peripheral surfaces in the vicinity of the base end portions of the outer joint pipes 10a and 10b. The large diameter portion into which the bolt head is inserted and the small diameter into which the screw portion is inserted. It consists of parts.
[0014]
The arcuate member 20 has a height corresponding to the height between the upper surface of the overhanging step portion 12 and the lower surface of the overhanging portion 13 when the outer joint pipes 10a and 10b are brought into contact with each other, and is almost the same as the outer joint tube 10a and 10b. A cylindrical body having the same material strength is divided into a plurality of parts in the circumferential direction, and the figure shows a case where it is divided into four parts, but this is not restrictive.
The inner diameter of the arc-shaped member 20 is substantially the same as the inner diameter of the protruding step portion 12 of the outer joint pipe 10a, and the outer joint has an outer diameter that has a large central portion in the axial direction and gradually decreases toward both ends. Concave and convex portions 21 corresponding to the concave and convex portions 11 a and 11 b provided on the inner peripheral surfaces of the tubes 10 a and 10 b are formed.
[0015]
22a and 22b are screw holes provided in the vicinity of the upper and lower ends corresponding to the bolt insertion holes 14a and 14b of the outer joint pipes 10a and 10b.
A bolt 30 includes a head portion 31 and a screw portion 32 as shown in FIG. 3, and the head portion 31 is provided with a hexagonal hole 33.
In the above description, the case where the concave and convex portions 11a and 11b provided on the inner peripheral surfaces of the outer joint pipes 10a and 10b and the concave and convex portion 21 provided on the outer peripheral surface of the arcuate member 20 are formed in an annular shape is shown. You may form intermittently.
[0016]
Next, an example of a construction procedure when the present invention is implemented for joining steel pipe piles will be described. In addition, the outer joint pipes 10a and 10b are respectively welded to the ends of the steel pipe piles to be joined in a factory or the like in advance, and these steel pipe piles, the arc-shaped member 20, the bolts 30 and the like are transported to the construction site. Shall.
[0017]
First, as shown in FIG. 4A, the steel pipe pile 1a to which the outer joint pipe 10a is connected is driven into the ground. When the driving progresses and the upper steel pipe pile 2a is connected, as shown in FIG. 4 (b), the lower end portion of the outer joint pipe 10a is positioned on the overhanging step portion 12 to form an arc shape. The member 20 is disposed, and the bolt 30 inserted from the bolt insertion hole 14a is screwed into the screw hole 22a and temporarily fixed. At this time, a slight gap is provided between the inner peripheral surface of the outer joint pipe 10a and the outer peripheral surface of the arcuate member 20 so that the outer joint pipe 10b of the steel pipe pile 2a can be easily inserted.
[0018]
In this state, as shown in FIG. 4 (c), the upper steel pipe pile 2a is lowered, and the outer joint pipe 10b joined thereto is fitted to the outer periphery of the arcuate member 20, and shown in FIG. 5 (a). In this way, the lower end portion is brought into contact with the upper end portion of the outer joint pipe 10a.
[0019]
Next, as shown in FIG. 5 (b), the bolt 30 screwed into the screw hole 22a of the arc-shaped member 20 is further screwed from the bolt insertion hole 14a of the outer joint pipe 10a, and the arc-shaped member 20 is extended. 13, and the bolt 30 inserted into the bolt insertion hole 14 b of the outer joint pipe 10 b is screwed into the screw hole 22 b of the arcuate member 20. Thereby, the arc-shaped member 20 drawn between the overhanging step portion 12 and the overhanging portion 13 has its uneven portion 21 fitted into the uneven portions 11a and 11b of the outer joint pipes 10a and 10b.
And as shown in FIG.5 (c), the upper and lower steel pipe piles 1a and 2a are firmly joined via the outer joint pipes 10a and 10b and the some circular arc member 20 by further tightening the upper and lower bolts 30. The
[0020]
The stress at the joined portion of the steel pipe piles 1a and 2a joined in this way resists the compressive force at the contact surfaces of the outer joint pipes 10a and 10b. Further, the tensile force is resisted by the shearing and supporting pressure of the concave and convex portions 11 a and 11 b provided on the inner surfaces of the outer joint pipes 10 a and 10 b and the concave and convex portions 21 a and 21 b provided on the outer surface of the arcuate member 20. Furthermore, the bending force is resisted by a mechanism similar to the compressive force and the tensile force because the stress property at the location where the maximum stress is applied is the same as the compressive force and the tensile force.
[0021]
As described above, in the present invention, the outer diameters of the outer joint pipes 10a and 10b are made substantially equal to the outer diameters of the steel pipe piles 1a and 2a, and the arc-shaped member 20 is arranged inside the outer joint pipe. As a result, the joint does not travel outside the steel pipe piles 1a and 2a, so that the penetration resistance into the ground can be reduced.
In construction, since the lower end portion of the arc-shaped member 20 is placed on the overhanging step portion 12 of the outer joint pipe 10a and temporarily fixed by the bolt 30, it is necessary to hold the arc-shaped member 20 separately. Therefore, workability can be improved.
[0022]
Furthermore, the thickness of the joint can be reduced compared to the conventional technology, so that the space in the pile can be secured. Therefore, it is possible to construct a steel pipe pile with a plate thickness that could not be handled by the conventional digging method. It became. Similarly, in landslide suppression steel pipe piles, it becomes possible to easily install mortar injection pipes arranged in the space in the pile, and it is possible to construct landslide suppression steel pipe piles with a thickness that could not be handled conventionally. It was.
[0023]
In the above description, the outer joint pipes 10a and 10b and the arcuate member 20 are shown as being formed by dividing a cylindrical body or a cylindrical body having substantially the same material strength as the steel pipes 1 and 2 in the circumferential direction. The material strength of the pipes 10a and 10b is made of a material larger than the material strength of the steel pipes 1 and 2 and the arcuate member 20, or the material strength of the arcuate member 20 is the material strength of the steel pipes 1 and 2 and the outer joint pipes 10a and 10b. may be formed with a larger material, furthermore, the outer joint tube 10a, may constitute a material strength of 10b and the arc-shaped member 20 at a greater material than the material strength of the steel pipe 1.
By comprising in this way, the wall thickness of both or any one of the outer joint pipe | tube 10a, 10b and the circular-arc-shaped member 20 can be made thin, and, thereby, the steel pipe inner space can be kept large.
[0024]
In the above description, the case where the joint structure according to the present invention is used as a joint for steel pipe piles is shown, but the present invention is not limited to this, and can also be implemented when joining steel pipes other than piles. .
[0025]
【The invention's effect】
The present invention is substantially equal to the outer diameter of the steel tube outer diameter is joined, the inner diameter size Kunar uneven portion is provided with increasing the tip portion on the inner peripheral surface, an outer which is joined respectively to the ends of the steel pipe A joint pipe, and a plurality of arc-shaped members provided with an uneven portion corresponding to the uneven portion on the outer periphery, the arc-shaped member is disposed on an inner peripheral surface of the outer joint tube, and is coupled by a bolt; Since the steel pipes are joined by fitting the parts to each other, the joining structure and joining method of steel pipes for steel pipe piles with high joint strength, easy on-site splicing, and low penetration resistance during pile driving Obtainable.
[Brief description of the drawings]
FIG. 1 is a schematic explanatory view of a steel pipe joining structure according to an embodiment of the present invention.
FIG. 2 is an exploded view of the left half of FIG.
FIG. 3 is a perspective view of the bolt of FIG. 1;
FIG. 4 is an explanatory diagram of an example of a construction procedure according to the present embodiment.
FIG. 5 is an explanatory diagram of an example of a construction procedure according to the present embodiment.
[Explanation of symbols]
1, 2 Steel pipes 10a, 10b Outer joint pipes 11a, 11b Uneven portion 12 Overhang step portions 14a, 14b Bolt insertion hole 20 Arc-shaped member 21 Uneven portion 22a, 22b Screw hole 30 Bolt

Claims

外径が接合される鋼管の外径とほぼ等しく、内周面に先端部になるにしたがって内径が大きくなる環状の凹凸部が階段状に設けられ、前記鋼管の端部にそれぞれ接合される外側継手管と、
該両外側継手管の先端部どうしを当接したときに両者の内周面に亘って配設され、外周面に前記外側継手管の凹凸部に対応して軸方向の中央部が大径で両端部になるにしたがって小径になる凹凸部が設けられた複数の円弧状部材とを有し、
前記外側継手管の内周部に前記凹凸部が互いに嵌合するように前記円弧状部材を配設して両者を結合することにより、前記２本の鋼管を接合することを特徴とする鋼管の接合構造。Approximately equal to the outer diameter of the steel tube outer diameter is joined, the concave-convex portion of the inner diameter size Kunar annular with increasing the tip on the inner peripheral surface is provided stepwise, it is joined respectively to the ends of the steel pipe An outer joint pipe,
When the tips of the outer joint pipes are brought into contact with each other, they are disposed over the inner peripheral surface of the both outer joint pipes, and the axially central portion has a large diameter corresponding to the concave and convex portions of the outer joint pipe on the outer peripheral surface. A plurality of arc-shaped members provided with concave and convex portions that become smaller in diameter as it becomes both ends,
The steel pipe is characterized in that the two steel pipes are joined by disposing the arcuate member so that the concave and convex portions are fitted to each other on the inner peripheral part of the outer joint pipe and joining them together. Joining structure.

前記外側継手管の内周部に、施工時に前記円弧状部材を仮保持する張出し段部を設けたことを特徴とする請求項１記載の鋼管の接合構造。The steel pipe joint structure according to claim 1, wherein an overhanging step portion that temporarily holds the arc-shaped member during construction is provided on an inner peripheral portion of the outer joint pipe.

前記外側継手管又は円弧状部材の材料強度を他の部材より大きくしたことを特徴とする請求項１又は２記載の鋼管の接合構造。The steel pipe joint structure according to claim 1 or 2, wherein a material strength of the outer joint pipe or the arc-shaped member is made larger than that of other members.

前記外側継手管及び円弧状部材の材料強度を、前記鋼管の材料強度より大きくしたことを特徴とする請求項１又は２記載の鋼管の接合構造。The steel pipe joint structure according to claim 1 or 2, wherein a material strength of the outer joint pipe and the arcuate member is greater than a material strength of the steel pipe.

請求項１の外側継手管を第１，第２の鋼管の先端部に接合する工程と、
前記第１の鋼管に接合された外側継手管の内面側に請求項１の円弧状部材を配設してボルトにより仮止めする工程と、
前記第２の鋼管に接合された外側継手管を前記円弧状部材に嵌装してその先端部を前記第１の鋼管に接合された外側継手管の先端部に当接する工程と、
前記第１，第２の鋼管に接合された外側継手管の凹凸部と前記円弧状部材の凹凸部とを嵌合させると共に、ボルトにより両者を固定する工程とを含むことを特徴とする鋼管の接合方法。Joining the outer joint pipe of claim 1 to the tip of the first and second steel pipes;
Disposing the arc-shaped member of claim 1 on the inner surface side of the outer joint pipe joined to the first steel pipe and temporarily fixing it with a bolt;
Fitting the outer joint pipe joined to the second steel pipe to the arcuate member and contacting the tip of the outer joint pipe to the tip of the outer joint pipe joined to the first steel pipe;
A step of fitting the concavo-convex portion of the outer joint pipe joined to the first and second steel pipes with the concavo-convex portion of the arcuate member, and fixing them with bolts. Joining method.