JP2004052333A

JP2004052333A - Steel pipe pile joining structure

Info

Publication number: JP2004052333A
Application number: JP2002210204A
Authority: JP
Inventors: Masahiko Fukazawa; 深澤　正彦
Original assignee: ORIMOTO TAKUMI KOZO SEKKEI KEN; ORIMOTO TAKUMI KOZO SEKKEI KENKYUSHO KK
Current assignee: ORIMOTO TAKUMI KOZO SEKKEI KEN; ORIMOTO TAKUMI KOZO SEKKEI KENKYUSHO KK
Priority date: 2002-07-18
Filing date: 2002-07-18
Publication date: 2004-02-19

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steel pipe pile joining structure without the need for site welding, and superior in reliability, constructibility and workability. <P>SOLUTION: This structure joins a pair of steel pipe piles. The end 11 of the first steel pipe pile 1 is formed with a plurality of projectons 11a formed at intervals in the peripheral direction so as to project in the axial direction and a plurality of recesses 11b formed between the plurality of projections. The end 12 of the second steel pipe pile 2 is formed in a shape supplementary to the end of the first steel pipe pile. Connecting members 13 and 15 are arranged for mutually connecting the projections adjacent in the peripheral direction in the fitting state of the end of the first steel pipe pile and the end of the second steel pipe pile. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、鋼管杭の接合構造に関するものである。
【０００２】
【従来の技術】
現在、鋼管杭の接合構造としては、一対の鋼管杭を現場溶接により接合する溶接継ぎ手構造が大半を占めている。なお、現場溶接を用いない無溶接継ぎ手構造として、ねじ式の継ぎ手構造や、フランジ端板を外部から覆って締め付けるタイプの継ぎ手構造等が提案されているが、実際にはほとんど使用されていないのが実情である。
【０００３】
【発明が解決しようとする課題】
一般に、現場溶接による鋼管杭の接合構造の場合、一対の鋼管杭を接合するための現場溶接に数十分の時間を要し、施工性が悪く且つ信頼性も低いという不都合があった。また、溶接作業は水を嫌い雨天での作業ができないため、作業性が低いという不都合もあった。
【０００４】
ところで近年、先端がスクリュー状に羽根を広げた形態を有し、大きな支持力を得ることのできるタイプの鋼管杭（「つばさ杭」などと呼称されている）が開発され、普及しつつある。この種の鋼管杭の施工方法は、一般的な鋼管杭の工法、すなわちオーガーによる中堀工法とは異なり、杭に回転力を与えることにより先端のスクリュー状の羽根を地盤にめり込ませる（ねじ込ませる）工法である。
【０００５】
その結果、この種の鋼管杭では、杭に逆回転力を与えることにより、一旦地盤にめり込ませた杭を抜くことも可能である。このような技術的背景に基づいて、先端がスクリュー状に羽根を広げた形態を有するタイプの鋼管杭を含むあらゆる鋼管杭に適用可能で、現場溶接を必要としない無溶接の接合構造が要望されている。
【０００６】
本発明は、前述の課題に鑑みてなされたものであり、現場溶接を必要とすることなく、信頼性、施工性および作業性に優れた鋼管杭の接合構造を提供することを目的とする。
【０００７】
【課題を解決するための手段】
前記課題を解決するために、本発明では、一対の鋼管杭を接合する構造において、
第１鋼管杭の端部は、その軸線方向に突出するように周方向に間隔を隔てて形成された複数の凸部と、該複数の凸部の間に形成された複数の凹部とを有し、
第２鋼管杭の端部は、前記第１鋼管杭の端部と補完的な形状を有し、
前記第１鋼管杭の端部と前記第２鋼管杭の端部との嵌合状態において周方向に沿って隣接する凸部を互いに連結するための連結部材を備えていることを特徴とする接合構造を提供する。
【０００８】
本発明の好ましい態様によれば、前記連結部材は、周方向に沿って延びる複数の円弧状帯部材と、該複数の円弧状帯部材を各凸部に締結するための締結部材とを有する。この場合、前記第１鋼管杭の端部の各凸部および前記第２鋼管杭の端部の各凸部には、前記嵌合状態において前記複数の円弧状帯部材を収容するための溝が形成されていることが好ましい。
【０００９】
また、本発明の好ましい態様によれば、前記第１鋼管杭の端部の各凸部および前記第２鋼管杭の端部の各凸部は、基底部よりも先端部のほうが小さい台形状の形態を有する。さらに、前記第１鋼管杭の端部には、前記複数の凸部が形成された第１継手部が工場溶接により取り付けられ、前記第２鋼管杭の端部には、前記複数の凸部が形成された第２継手部が工場溶接により取り付けられていることが好ましい。この場合、前記第１継手部と前記第２継手部とは互いに同じ形状を有することが好ましい。
【００１０】
【発明の実施の形態】
本発明の実施形態を、添付図面に基づいて説明する。
図１は、本発明の実施形態にかかる鋼管杭の接合構造を示す図であって、鋼管杭の端部に取り付けられた継手部の構成を概略的に示す斜視図である。また、図２は、図１に示す一対の鋼管杭の端部が互いに嵌合した状態において複数の円弧状帯部材を取り付けた接合状態を概略的に示す斜視図である。
【００１１】
また、図３は、図２における円弧状帯部材の取り付け状態を説明する図であって、（ａ）は展開側面図を、（ｂ）は（ａ）の線Ａ−Ａに沿った断面図を示している。なお、図１において、各鋼管杭の端部構造は基本的に同じであるため、第２鋼管杭にかかる部分についてはその参照符号を括弧内に示している。
【００１２】
図１を参照すると、互いに接合すべき一対の鋼管杭、すなわち第１鋼管杭１および第２鋼管杭２の端部には、第１継手部１１および第２継手部１２が、たとえば工場溶接（参照符合２１および２２でそれぞれ示す）によりそれぞれ取り付けられている。第１継手部１１および第２継手部１２はともに、第１鋼管杭１および第２鋼管杭２の軸線方向に突出するように周方向に等間隔を隔てて形成された複数の凸部１１ａおよび１２ａと、これらの間に形成された複数の凹部１１ｂおよび１２ｂとをそれぞれ有する。
【００１３】
ここで、第１継手部１１に形成された各凸部１１ａおよび第２継手部１２に形成された各凸部１２ａは、互いに同じ形状、すなわち基底部よりも先端部のほうが小さく且つ軸線方向に関して対称な台形状の形態を有する。また、第１継手部１１に形成された凸部１１ａおよび凹部１１ｂと第２継手部１２に形成された凸部１２ａおよび凹部１２ｂとが互いに嵌合するように、第１継手部１１と第２継手部１２とは補完的な形状を有する。さらに詳細には、第１継手部１１と第２継手部１２とは互いに同じ形状を有する。
【００１４】
また、第１継手部１１の凸部１１ａおよび第２継手部１２の凸部１２ａには、同じ幅の切欠き部１１ｃおよび１２ｃが周方向に沿ってそれぞれ形成されている。これらの切欠き部１１ｃおよび１２ｃは、後述するように、第１継手部１１と第２継手部１２との嵌合状態において複数の円弧状帯部材１３を収容するための溝を構成することになる。なお、切欠き部１１ｃおよび１２ｃの底面、すなわち切欠き部１１ｃおよび１２ｃにおいて第１鋼管杭１および第２鋼管杭２の軸線方向に沿って延在する面のほぼ中央には、後述のボルト１５が螺合すべき雌ねじ１４が刻設されている。
【００１５】
こうして、第１継手部１１の凸部１１ａと第２継手部１２の凹部１２ｂとが対向し且つ第１継手部１１の凹部１１ｂと第２継手部１２の凸部１２ａとが対向するように第１鋼管杭１と第２鋼管杭２とを位置決めし、第１鋼管杭１と第２鋼管杭２とを当接するまで相対的に近接させることにより、図２および図３に示すような嵌合状態が得られる。このとき、第１継手部１１の凸部１１ａのテーパ面１１ｄと、第２継手部１２の凸部１２ａのテーパ面１２ｄとが当接する。
【００１６】
ただし、第１継手部１１の凸部１１ａの上面１１ｅと第２継手部１２の凹部１２ｂの底面１２ｆ、並びに第１継手部１１の凹部１１ｂの底面１１ｆと第２継手部１２の凸部１２ａの上面１２ｅとは、互いに当接してもよいが、わずかな間隔を隔てて当接しない方が好ましい。この構成により、第１継手部１１の凸部１１ａおよび第２継手部１２の凸部１２ａの製造誤差を吸収することができ、ひいては要求される寸法精度を緩和することができるからである。
【００１７】
さらに、図２および図３に示すように、本実施形態の接合構造は、第１継手部１１と第２継手部１２との嵌合状態において切欠き部１１ｃおよび１２ｃが形成する周方向の溝に収容されるように構成された複数（たとえば２つまたは３つ）の円弧状帯部材１３と、複数の円弧状帯部材１３を各凸部１１ａおよび１２ａに形成された雌ねじ１４にねじ締結するための複数のボルト１５とを備えている。ここで、円弧状帯部材１３には、ボルト１５が貫通するための直孔が形成されていることはいうまでもない。ボルト１５として、たとえば六角ボルトなどを用いることができる。
【００１８】
なお、接合状態においてボルト１５のヘッド部分が実質的に外側へ突出しないように、ボルト１５のヘッド部分を収容するための円柱状の窪み（図３を参照）を円弧状帯部材１３に形成することが好ましい。また、図３に示すように、円弧状帯部材１３の側端面、並びに切欠き部１１ｃおよび１２ｃの側端面をテーパ面形状に形成し、接合状態において円弧状帯部材１３の底面と切欠き部１１ｃおよび１２ｃの底面とがわずかに間隔を隔てて当接しないように構成することが好ましい。
【００１９】
この構成により、切欠き部１１ｃおよび１２ｃ並びに円弧状帯部材１３に要求される寸法精度を緩和しつつ、円弧状帯部材１３と第１継手部１１および第２継手部１２との密着度を高めることができる。以上のように、ボルト１５は、複数の円弧状帯部材１３を各凸部１１ａおよび１２ａに締結するための締結部材を構成している。また、複数の円弧状帯部材１３と複数のボルト１５とは、第１継手部１１と第２継手部１２との嵌合状態において周方向に沿って隣接する凸部１１ａと１２ａとを互いに連結するための連結部材を構成している。
【００２０】
一般に、鋼管杭の接合構造において要求される力学的性能は、圧縮耐力、引張耐力、剪断耐力、曲げモーメント耐力、回転ねじれ耐力である。本実施形態では、主として、第１継手部１１の凸部１１ａのテーパ面１１ｄと第２継手部１２の凸部１２ａのテーパ面１２ｄとの当接により、所望の圧縮耐力を確保することができる。また、主として、第１継手部１１と第２継手部１２との嵌合状態において周方向に沿って隣接する凸部１１ａと１２ａとを互いに連結するための連結部材、すなわち複数の円弧状帯部材１３と複数のボルト１５との作用により、所望の引張耐力を確保することができる。
【００２１】
さらに、主として、第１継手部１１と第２継手部１２との嵌合、すなわちテーパ面１１ｄとテーパ面１２ｄとの当接により、所望の剪断耐力を確保することができる。また、主として、複数の円弧状帯部材１３と複数のボルト１５とからなる連結部材の作用により、所望の曲げモーメント耐力を確保することができる。さらに、主として、第１継手部１１と第２継手部１２との嵌合、すなわちテーパ面１１ｄとテーパ面１２ｄとの当接により、所望の回転ねじれ耐力を確保することができる。
【００２２】
こうして、本実施形態では、現場溶接を必要とすることなく、信頼性、施工性および作業性に優れた鋼管杭の接合構造を実現することができる。なお、上述したように、本実施形態の鋼管杭の接合構造は、要求される力学的性能（圧縮耐力、引張耐力、剪断耐力、曲げモーメント耐力、回転ねじれ耐力）を十分に確保することができるので、先端がスクリュー状に羽根を広げた形態を有するタイプの鋼管杭を含むあらゆる鋼管杭に適用可能である。
【００２３】
ところで、第１継手部１１および第２継手部１２は、たとえば型成形や削出し成形などにより個別に製造することができる。特に、本実施形態では、第１継手部１１と第２継手部１２とが互いに同じ形状を有するので、製造コストの低減に有利である。また、さらに製造コストの低減を図るには、第１継手部１１と第２継手部１２との嵌合状態と同じ断面形状を有する管状部材を型成形や削出し成形などにより形成し、たとえばレーザー加工により上記管状部材をジグザグに切断することにより、第１継手部１１および第２継手部１２を製造することが好ましい。
【００２４】
また、図３を参照すると、第１継手部１１の凸部１１ａのテーパ面１１ｄ（または第２継手部１２の凸部１２ａのテーパ面１２ｄ）と周方向とのなす角度θが、たとえば４５度よりも大きく且つ８５度よりも小さいことが好ましい。角度θが４５度以下の場合には、特に所望の回転ねじれ耐力を確保することが困難になるので不都合である。一方、角度θが８５度以上の場合には、テーパ面１１ｄおよび１２ｄが嵌合のための案内面として機能し難くなるので不都合である。
【００２５】
なお、上述の実施形態では、第１継手部１１と第２継手部１２とが互いに同じ形状を有するが、これに限定されることなく、第１継手部１１および第２継手部１２の形状については様々な変形例が可能である。また、上述の実施形態では、第１継手部１１に形成された各凸部１１ａおよび第２継手部１２に形成された各凸部１２ａが軸線方向に関して対称な台形状の形態を有するが、これに限定されることなく、各凸部１１ａおよび各凸部１２ａの形態については様々な変形例が可能である。
【００２６】
さらに、上述の実施形態では、一対の鋼管杭、すなわち第１鋼管杭１と第２鋼管杭２との接合に対して本発明を適用しているが、これに限定されることなく、３本以上の鋼管杭の接合に対して本発明を適用することができることはいうまでもない。
【００２７】
【発明の効果】
以上説明したように、本発明では、現場溶接を必要とすることなく、信頼性、施工性および作業性に優れた鋼管杭の接合構造を実現することができる。本発明にかかる鋼管杭の接合構造は、要求される力学的性能を十分に確保することのできる構成を有するので、先端がスクリュー状に羽根を広げた形態を有するタイプの鋼管杭を含むあらゆる鋼管杭に適用可能である。
【図面の簡単な説明】
【図１】本発明の実施形態にかかる鋼管杭の接合構造を示す図であって、鋼管杭の端部に取り付けられた継手部の構成を概略的に示す斜視図である。
【図２】図１に示す一対の鋼管杭の端部が互いに嵌合した状態において複数の円弧状帯部材を取り付けた接合状態を概略的に示す斜視図である。
【図３】図２における円弧状帯部材の取り付け状態を説明する図であって、（ａ）は展開側面図を、（ｂ）は（ａ）の線Ａ−Ａに沿った断面図を示している。
【符号の説明】
１　第１鋼管杭
２　第２鋼管杭
１１　第１継手部
１２　第２継手部
１１ａ，１２ａ　凸部
１１ｂ，１２ｂ　凹部
１１ｃ，１２ｃ　凸部の切欠き部
１１ｄ，１２ｄ　凸部のテーパ面
１１ｅ，１２ｅ　凸部の上面
１１ｆ，１２ｆ　凹部の底面
１３　円弧状帯部材
１４　雌ねじ
１５　ボルト
２１，２２　工場溶接部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a joint structure for steel pipe piles.
[0002]
[Prior art]
At present, as a joining structure of steel pipe piles, a welded joint structure for joining a pair of steel pipe piles by field welding occupies most. As a non-weld joint structure that does not use field welding, a screw joint structure or a joint structure of a type in which a flange end plate is covered from the outside and tightened have been proposed. Is the fact.
[0003]
[Problems to be solved by the invention]
In general, in the case of a joint structure of steel pipe piles by on-site welding, it takes several tens of minutes for on-site welding for joining a pair of steel pipe piles, and there is a disadvantage that workability is poor and reliability is low. In addition, since welding work cannot be performed in rainy weather because of dislike of water, workability is low.
[0004]
By the way, in recent years, a steel pipe pile (referred to as a “wing pile” or the like) having a shape in which a blade is spread in a screw shape and capable of obtaining a large supporting force has been developed and is becoming popular. The construction method of this type of steel pipe pile is different from the general steel pipe pile construction method, namely, the middle moat construction method using an auger, and the screw-shaped blade at the tip is sunk into the ground by applying a rotational force to the pile (screw-in) ).
[0005]
As a result, in this type of steel pipe pile, it is possible to pull out a pile once sunk into the ground by applying a reverse rotation force to the pile. Based on such a technical background, there is a demand for a welding-free joining structure that can be applied to all steel pipe piles including a steel pipe pile of a type having a form in which a blade is spread in a screw shape at a tip and does not require on-site welding. ing.
[0006]
The present invention has been made in view of the above-described problems, and has as its object to provide a joint structure for a steel pipe pile excellent in reliability, workability, and workability without requiring on-site welding.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, in the present invention, in a structure for joining a pair of steel pipe piles,
The end of the first steel pipe pile has a plurality of protrusions formed at intervals in the circumferential direction so as to protrude in the axial direction, and a plurality of recesses formed between the plurality of protrusions. And
The end of the second steel pipe pile has a shape complementary to the end of the first steel pipe pile,
A joint comprising a connecting member for connecting adjacent convex portions along the circumferential direction to each other in a fitted state of the end of the first steel pipe pile and the end of the second steel pipe pile. Provide structure.
[0008]
According to a preferred aspect of the present invention, the connecting member includes a plurality of arc-shaped band members extending along the circumferential direction, and a fastening member for fastening the plurality of arc-shaped band members to each convex portion. In this case, a groove for accommodating the plurality of arc-shaped band members in the fitted state is formed in each of the protrusions at the end of the first steel pipe pile and at each of the protrusions at the end of the second steel pipe pile. Preferably, it is formed.
[0009]
According to a preferred aspect of the present invention, each of the protrusions at the end of the first steel pipe pile and each of the protrusions at the end of the second steel pipe pile have a trapezoidal shape in which the tip is smaller than the base. Have a form. Further, a first joint portion on which the plurality of protrusions are formed is attached to an end of the first steel pipe pile by factory welding, and the plurality of protrusions is mounted on an end of the second steel pipe pile. It is preferable that the formed second joint part is attached by factory welding. In this case, it is preferable that the first joint portion and the second joint portion have the same shape as each other.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a diagram illustrating a joint structure of a steel pipe pile according to an embodiment of the present invention, and is a perspective view schematically illustrating a configuration of a joint portion attached to an end of the steel pipe pile. FIG. 2 is a perspective view schematically showing a joined state in which a plurality of arc-shaped band members are attached in a state where ends of a pair of steel pipe piles shown in FIG. 1 are fitted to each other.
[0011]
FIGS. 3A and 3B are views for explaining an attached state of the arc-shaped band member in FIG. 2, wherein FIG. 3A is a developed side view, and FIG. 3B is a cross-sectional view taken along line AA of FIG. Is shown. In addition, in FIG. 1, since the end structure of each steel pipe pile is basically the same, the reference numerals for the portions related to the second steel pipe pile are shown in parentheses.
[0012]
Referring to FIG. 1, a pair of steel pipe piles to be joined to each other, that is, a first joint part 11 and a second joint part 12 are provided at the ends of a first steel pipe pile 1 and a second steel pipe pile 2, for example, by factory welding ( (Indicated by reference numerals 21 and 22, respectively). Each of the first joint portion 11 and the second joint portion 12 has a plurality of convex portions 11a formed at equal intervals in the circumferential direction so as to protrude in the axial direction of the first steel pipe pile 1 and the second steel pipe pile 2, and 12a, and a plurality of recesses 11b and 12b formed therebetween.
[0013]
Here, each convex portion 11a formed on the first joint portion 11 and each convex portion 12a formed on the second joint portion 12 have the same shape, that is, the distal end portion is smaller than the base portion and the axial direction is smaller. It has a symmetric trapezoidal form. Further, the first joint portion 11 and the second joint portion 11 are formed such that the convex portion 11a and the concave portion 11b formed on the first joint portion 11 and the convex portion 12a and the concave portion 12b formed on the second joint portion 12 are fitted to each other. The joint portion 12 has a complementary shape. More specifically, the first joint portion 11 and the second joint portion 12 have the same shape as each other.
[0014]
Notches 11c and 12c having the same width are formed along the circumferential direction on the protrusion 11a of the first joint 11 and the protrusion 12a of the second joint 12, respectively. These notches 11c and 12c form grooves for accommodating a plurality of arc-shaped band members 13 in a state where the first joint 11 and the second joint 12 are fitted, as described later. Become. Note that bolts 15 described later are provided on the bottom surfaces of the notch portions 11c and 12c, that is, substantially at the centers of the surfaces of the notch portions 11c and 12c extending along the axial direction of the first steel pipe pile 1 and the second steel pipe pile 2. The female screw 14 to be screwed is formed.
[0015]
In this manner, the first joint portion 11 is opposed to the concave portion 12b of the second joint portion 12, and the concave portion 11b of the first joint portion 11 is opposed to the convex portion 12a of the second joint portion 12. By positioning the first steel pipe pile 1 and the second steel pipe pile 2 and bringing the first steel pipe pile 1 and the second steel pipe pile 2 relatively close to each other until they come into contact with each other, the fitting as shown in FIGS. The state is obtained. At this time, the tapered surface 11d of the convex portion 11a of the first joint portion 11 and the tapered surface 12d of the convex portion 12a of the second joint portion 12 abut.
[0016]
However, the upper surface 11e of the convex portion 11a of the first joint portion 11 and the bottom surface 12f of the concave portion 12b of the second joint portion 12, and the bottom surface 11f of the concave portion 11b of the first joint portion 11 and the convex portion 12a of the second joint portion 12 The upper surface 12e may abut against each other, but preferably does not abut at a slight interval. With this configuration, it is possible to absorb a manufacturing error of the convex portion 11a of the first joint portion 11 and the convex portion 12a of the second joint portion 12, and to reduce required dimensional accuracy.
[0017]
Further, as shown in FIGS. 2 and 3, the joint structure of the present embodiment has a circumferential groove formed by the notches 11 c and 12 c when the first joint 11 and the second joint 12 are fitted to each other. A plurality of (for example, two or three) arc-shaped band members 13 configured to be accommodated in the plurality of convex portions 11a and 12a are screw-fastened to the female screws 14 formed on the convex portions 11a and 12a. And a plurality of bolts 15. Here, it goes without saying that the arc-shaped band member 13 is formed with a straight hole through which the bolt 15 passes. As the bolt 15, for example, a hexagon bolt can be used.
[0018]
In order to prevent the head portion of the bolt 15 from protruding substantially outward in the joined state, a columnar recess (see FIG. 3) for accommodating the head portion of the bolt 15 is formed in the arc-shaped band member 13. Is preferred. Further, as shown in FIG. 3, the side end surfaces of the arc-shaped band member 13 and the side end surfaces of the notches 11c and 12c are formed in a tapered shape, and the bottom surface of the arc-shaped band member 13 and the notch are formed in the joined state. It is preferable that the bottom surfaces of 11c and 12c do not abut slightly apart from each other.
[0019]
With this configuration, the degree of adhesion between the arc-shaped band member 13 and the first joint portion 11 and the second joint portion 12 is increased while relaxing the dimensional accuracy required for the notch portions 11c and 12c and the arc-shaped band member 13. be able to. As described above, the bolt 15 forms a fastening member for fastening the plurality of arc-shaped band members 13 to the respective convex portions 11a and 12a. Further, the plurality of arc-shaped band members 13 and the plurality of bolts 15 mutually connect the adjacent convex portions 11a and 12a along the circumferential direction when the first joint portion 11 and the second joint portion 12 are fitted. To form a connecting member.
[0020]
In general, the mechanical performance required in the joint structure of steel pipe piles is compressive strength, tensile strength, shear strength, bending moment strength, and rotational torsional strength. In the present embodiment, a desired compression strength can be ensured mainly by the contact between the tapered surface 11d of the convex portion 11a of the first joint portion 11 and the tapered surface 12d of the convex portion 12a of the second joint portion 12. . A connecting member for connecting the convex portions 11a and 12a adjacent to each other along the circumferential direction in a fitting state of the first joint portion 11 and the second joint portion 12, ie, a plurality of arc-shaped band members. The desired tensile strength can be ensured by the action of 13 and the plurality of bolts 15.
[0021]
Furthermore, a desired shear strength can be secured mainly by fitting the first joint portion 11 and the second joint portion 12, that is, by abutting the tapered surface 11 d with the tapered surface 12 d. In addition, a desired bending moment resistance can be secured mainly by the action of the connecting member including the plurality of arc-shaped band members 13 and the plurality of bolts 15. Further, mainly by fitting the first joint portion 11 and the second joint portion 12, that is, by abutting the tapered surface 11d and the tapered surface 12d, a desired rotational torsional strength can be secured.
[0022]
Thus, in the present embodiment, it is possible to realize a joint structure of a steel pipe pile excellent in reliability, workability, and workability without requiring on-site welding. As described above, the joint structure of the steel pipe pile according to the present embodiment can sufficiently secure required mechanical performances (compression proof, tensile proof, shear proof, bending moment proof, and rotational torsional proof). Therefore, the present invention can be applied to all types of steel pipe piles, including a steel pipe pile of a type in which blades are spread in a screw shape at the tip.
[0023]
By the way, the first joint portion 11 and the second joint portion 12 can be individually manufactured by, for example, mold forming or cut-out forming. In particular, in the present embodiment, the first joint portion 11 and the second joint portion 12 have the same shape as each other, which is advantageous in reducing the manufacturing cost. Further, in order to further reduce the manufacturing cost, a tubular member having the same cross-sectional shape as the fitting state of the first joint portion 11 and the second joint portion 12 is formed by molding, cutting, or the like. It is preferable to manufacture the first joint portion 11 and the second joint portion 12 by zigzag cutting the tubular member by processing.
[0024]
Referring to FIG. 3, the angle θ between the tapered surface 11d of the convex portion 11a of the first joint portion 11 (or the tapered surface 12d of the convex portion 12a of the second joint portion 12) and the circumferential direction is, for example, 45 degrees. Preferably, it is larger than 85 degrees and smaller than 85 degrees. If the angle θ is 45 degrees or less, it is inconvenient because it becomes particularly difficult to secure a desired rotational torsional strength. On the other hand, if the angle θ is 85 degrees or more, it is inconvenient because the tapered surfaces 11d and 12d hardly function as guide surfaces for fitting.
[0025]
In the above-described embodiment, the first joint portion 11 and the second joint portion 12 have the same shape as each other, but the shape is not limited to this, and the shapes of the first joint portion 11 and the second joint portion 12 are not limited thereto. Various modifications are possible. In the above-described embodiment, each of the protrusions 11a formed on the first joint portion 11 and each of the protrusions 12a formed on the second joint portion 12 have a trapezoidal shape that is symmetric with respect to the axial direction. The present invention is not limited to this, and various modifications are possible for the form of each of the protrusions 11a and each of the protrusions 12a.
[0026]
Furthermore, in the above-described embodiment, the present invention is applied to a pair of steel pipe piles, that is, the joining between the first steel pipe pile 1 and the second steel pipe pile 2, but the present invention is not limited to this, and three It goes without saying that the present invention can be applied to the joining of the steel pipe piles described above.
[0027]
【The invention's effect】
As described above, according to the present invention, it is possible to realize a joint structure of a steel pipe pile excellent in reliability, workability, and workability without requiring on-site welding. Since the joining structure of the steel pipe pile according to the present invention has a configuration capable of sufficiently securing the required mechanical performance, any steel pipe including a steel pipe pile having a form in which a blade is spread in a screw shape at the tip is used. Applicable to piles.
[Brief description of the drawings]
FIG. 1 is a view showing a joint structure of a steel pipe pile according to an embodiment of the present invention, and is a perspective view schematically showing a configuration of a joint part attached to an end of the steel pipe pile.
FIG. 2 is a perspective view schematically showing a joined state in which a plurality of arc-shaped band members are attached in a state where ends of a pair of steel pipe piles shown in FIG. 1 are fitted to each other.
3A and 3B are views for explaining an attachment state of the arc-shaped band member in FIG. 2, wherein FIG. 3A is a developed side view, and FIG. 3B is a cross-sectional view taken along line AA of FIG. ing.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1st steel pipe pile 2 2nd steel pipe pile 11 1st joint part 12 2nd joint part 11a, 12a Convex part 11b, 12b Concave part 11c, 12c Notch part 11d, 12d of convex part Tapered surface 11e, 12e convex part of convex part Upper surface 11f, 12f Bottom surface of concave portion 13 Arc-shaped band member 14 Female screw 15 Bolt 21, 22 Factory welded portion

Claims

In the structure that joins a pair of steel pipe piles,
The end of the first steel pipe pile has a plurality of protrusions formed at intervals in the circumferential direction so as to protrude in the axial direction, and a plurality of recesses formed between the plurality of protrusions. And
The end of the second steel pipe pile has a shape complementary to the end of the first steel pipe pile,
A joint comprising a connecting member for connecting adjacent convex portions along the circumferential direction to each other in a fitted state of the end of the first steel pipe pile and the end of the second steel pipe pile. Construction.

2. The connecting member according to claim 1, wherein the connecting member includes a plurality of arc-shaped band members extending along a circumferential direction, and a fastening member for fastening the plurality of arc-shaped band members to each protrusion. 3. Joint structure.

Grooves for accommodating the plurality of arc-shaped band members in the fitted state are formed in each of the protrusions at the end of the first steel pipe pile and at each of the protrusions at the end of the second steel pipe pile. The joining structure according to claim 2, wherein:

2. The convex portion at the end of the first steel pipe pile and each convex portion at the end of the second steel pipe pile have a trapezoidal shape having a tip portion smaller than a base portion. 3. 4. The joining structure according to any one of claims 3 to 3.

At the end of the first steel pipe pile, a first joint portion formed with the plurality of protrusions is attached by factory welding,
5. The end according to claim 1, wherein a second joint having the plurality of protrusions is attached to an end of the second steel pipe pile by factory welding. 6. Joint structure.

The joint structure according to claim 5, wherein the first joint portion and the second joint portion have the same shape.