JP2011208373A - Mechanical joint structure of steel pipe pile - Google Patents

Mechanical joint structure of steel pipe pile Download PDF

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JP2011208373A
JP2011208373A JP2010074495A JP2010074495A JP2011208373A JP 2011208373 A JP2011208373 A JP 2011208373A JP 2010074495 A JP2010074495 A JP 2010074495A JP 2010074495 A JP2010074495 A JP 2010074495A JP 2011208373 A JP2011208373 A JP 2011208373A
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steel pipe
pipe
joint pipe
joint
diameter
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Kei Kasahara
啓 笠原
Noriyuki Kawabata
規之 川端
Masabumi Tatsuki
正文 田附
Takeo Harada
剛男 原田
Yasuyuki Yoshida
耕之 吉田
Toshio Shinohara
敏雄 篠原
Shigeo Kanai
重夫 金井
Yukari Hanada
ゆかり 花田
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Nippon Steel Metal Products Co Ltd
Chiyoda Geotech Co Ltd
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Chiyoda Geotech Co Ltd
Nippon Steel and Sumikin Metal Products Co Ltd
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Priority to JP2010074495A priority Critical patent/JP2011208373A/en
Priority to PCT/JP2011/056270 priority patent/WO2011122349A1/en
Publication of JP2011208373A publication Critical patent/JP2011208373A/en
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22—Piles
    • E02D5/52—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments
    • E02D5/523—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments composed of segments
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22—Piles
    • E02D5/24—Prefabricated piles
    • E02D5/28—Prefabricated piles made of steel or other metals
    • E02D5/285—Prefabricated piles made of steel or other metals tubular, e.g. prefabricated from sheet pile elements

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Piles And Underground Anchors (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a joint structure which makes two steel pipe piles serially and mechanically coupled together by fitting and pinning inner and outer joint pipes fixed to corresponding end surfaces of the steel pipe piles by welding.SOLUTION: The outer joint pipe 3, which has a plurality of coupling holes 3a, ... radially drilled in a peripheral wall, is fixed to the end surface of the one steel pipe pile 1. An end fitting 4 is fixed to the corresponding end surface of the other steel pipe pile 2 by welding; and the inner joint pipe 5, which can be fitted into the inside of the outer joint pipe 3 and which has a plurality of coupling holes 4a, ... radially drilled in a peripheral wall in disposition corresponding to the coupling holes 3a of the outer joint pipe 3, is fixed to the other side surface of the end fitting 4 by welding. The inner joint pipe 5 is inserted into the outer joint pipe 3; a coupling pin 6 is inserted by making the coupling holes 3a and 5a of the outer and inner joint pipes 3 and 5 agree with one another; and coming-off prevention treatment is applied to couple the two steel pipe piles 1 and 2 together.

Description

この発明は、鋼管杭の対応する端面に溶接で固着した内継手管と外継手管とを嵌め合わせ、ピン止めして一連に機械式に連結する継手構造の技術分野に属する。   The present invention belongs to a technical field of a joint structure in which an inner joint pipe and an outer joint pipe fixed by welding are fitted to corresponding end faces of a steel pipe pile, and are pinned and connected mechanically in series.

従来、鋼管杭を現場で一連に連結する手段の多くは、現場で相互に突き合わせた鋼管杭の端部を溶接で固着して連結する現場溶接継手が実施されてきた。しかし、現場における溶接は、溶接品質が作業員の技量や天候によって左右されやすく、更に現場での溶接作業は非常に手間が掛かり、工期が長引いてコストが嵩む問題があった。そのため、最近では現場溶接に代わる機械式継手で連結する継手構造が種々開発され、既に実用に供されている。   Conventionally, many of the means for connecting steel pipe piles in series at the site have been practiced in-situ welded joints in which the ends of the steel pipe piles that are butted against each other are fixedly connected by welding. However, in the field welding, there is a problem that the welding quality is easily influenced by the skill of the worker and the weather, and further, the field welding work is very troublesome, and the construction period is prolonged and the cost is increased. For this reason, recently, various joint structures connected by mechanical joints in place of on-site welding have been developed and already put into practical use.

例えば、下記特許文献１に開示された鋼管杭の機械式継手構造は、図８に示すように、下位の鋼管杭１の上端面に、周壁に複数の連結用孔３ａ…が穿たれた外継手管３が予め工場における溶接ａで固着され、上位の鋼管杭２の下端面には、前記外継手管３の内径に密接する外径で、周壁に複数の連結用孔５ａ…が穿たれた内継手管５がやはり工場における溶接ｂで固着される。現場では前記内継手管５を外継手管３の管内へ嵌め込み、両管の連結用孔３ａ、５ａを一致させて同連結用孔３ａ、５ａへ連結用ピン６を係止部材５ｂに突き当たるまで挿入し、該連結用ピン６のボルト通し孔へ止めボルト７を挿入し、該ボルト７の先端部を係止部材５ｂのボルト孔へねじ込み締結して２本の鋼管杭１、２を連結した構成である。   For example, the mechanical joint structure of a steel pipe pile disclosed in the following Patent Document 1 is an outer surface in which a plurality of connecting holes 3a are formed in the peripheral wall on the upper end surface of the lower steel pipe pile 1 as shown in FIG. The joint pipe 3 is fixed in advance by welding a in the factory, and the lower end surface of the upper steel pipe pile 2 has an outer diameter close to the inner diameter of the outer joint pipe 3 and a plurality of connecting holes 5a. The inner joint pipe 5 is also fixed by welding b in the factory. At the site, the inner joint pipe 5 is fitted into the pipe of the outer joint pipe 3, the connecting holes 3a and 5a of both pipes are matched, and the connecting pin 6 hits the locking member 5b in the connecting holes 3a and 5a. Inserted, a set bolt 7 was inserted into the bolt through hole of the connecting pin 6, and the tip of the bolt 7 was screwed into the bolt hole of the locking member 5b and fastened to connect the two steel pipe piles 1 and 2 It is a configuration.

特開２００６−３７６１９号公報JP 2006-37619 A 特開２００９−１３８３８２号公報JP 2009-138382 A

上記特許文献１に開示された鋼管杭の機械式継手構造は、図８に基づいて説明したように、上位の鋼管２と工場溶接で固着した内継手管５は、鋼管杭１、２の外径と、当該内継手管５の内径との寸法差Ｓ（一例として２５ｍｍ）に相当する厚さの厚板鋼管の外周面を、当該内継手管５の嵌め込み長さＬにわたり、例えば旋盤により外継手管３の内側へ密接する外径まで切削加工して製作し、残る上端部の非切削加工部５１を上位の鋼管杭２と工場で溶接し固着している。しかし、前記厚板鋼管の厚さの約半分を旋盤で切削加工する作業は、非常に手間が掛かり時間を要する上に、大量の鋼屑が発生して鋼材に多大な無駄が生じ、該鋼屑の処分にも手間とコストが掛かる。また、前記のような厚板鋼管は特殊サイズになるため入手が容易ではなく、納期が長く掛かる。更に、前記厚板鋼管の製作は、薄板鋼管の製作に比して重量当たりの単価が非常にコスト高になるという問題があった。
上記特許文献２に開示された鋼管杭の機械式継手構造も、基本的な構成が上記特許文献１の機械式継手構造とほぼ同じであるため、同様の問題点を有する。 As described with reference to FIG. 8, the mechanical joint structure of the steel pipe pile disclosed in the above-mentioned Patent Document 1 is the outer joint pipe 5 fixed to the upper steel pipe 2 by factory welding. The outer peripheral surface of a thick steel pipe having a thickness corresponding to the dimensional difference S (for example, 25 mm) between the diameter and the inner diameter of the inner joint pipe 5 is extended over the fitting length L of the inner joint pipe 5 by, for example, a lathe. The outer diameter close to the inside of the joint pipe 3 is cut and manufactured, and the remaining non-cut portion 51 at the upper end is welded and fixed to the upper steel pipe pile 2 at the factory. However, the work of cutting about half of the thickness of the steel plate pipe with a lathe is very time consuming and time consuming, and a large amount of steel scrap is generated, resulting in great waste of the steel material. Disposal of waste also takes time and cost. Moreover, since the above-mentioned thick steel pipe becomes a special size, it is not easy to obtain and takes a long delivery time. Further, the production of the thick steel pipe has a problem that the unit price per weight is very high as compared with the production of the thin steel pipe.
The mechanical joint structure of a steel pipe pile disclosed in Patent Document 2 has the same problem because the basic configuration is almost the same as the mechanical joint structure of Patent Document 1.

因みに、上記特許文献１及び２に開示された所謂印籠型継手においては、通常外継手管の内面と内継手管の外面の両方を切削加工するため、外継手管の内径と内継手管の外径との差、即ち径差を０．５ｍｍ〜１．０ｍｍと小さく設定することが多く、このため外継手管の外径と厚さが決まると、内継手管の外径はほとんど自動的に決まった。ところが、鋼材単価の安い鋼管は外径が標準化されているため、同鋼管を使用すると、内継手管の外径が外継手管の内径に合わないことが多く、このため外継手管の内面または内継手管の外面を切削加工して所要の径に形成する必要がある。また、鋼管の外径、内径ともに造管時に若干の寸法誤差が避けられないし、断面形状も真円度誤差があり完全な円形ではないので、外継手管に内継手管を挿入できない虞がある。このため、両管の前記径差を従来のように、０．５ｍｍ〜１．０ｍｍに設定すると、外継手管内面も内継手管外面も旋盤等で切削加工しなければならず、大きなコストアップとなる。   Incidentally, in the so-called stamped joints disclosed in Patent Documents 1 and 2 above, since both the inner surface of the outer joint pipe and the outer surface of the inner joint pipe are usually cut, The difference from the diameter, that is, the diameter difference is often set as small as 0.5 mm to 1.0 mm. Therefore, when the outer diameter and thickness of the outer joint pipe are determined, the outer diameter of the inner joint pipe is almost automatically set. decided. However, since the outer diameter of a steel pipe with a low unit price is standardized, when the steel pipe is used, the outer diameter of the inner joint pipe often does not match the inner diameter of the outer joint pipe. It is necessary to cut the outer surface of the inner joint pipe to a required diameter. In addition, there is a risk that some dimensional errors in the outer and inner diameters of the steel pipe are unavoidable during pipe making, and the cross-sectional shape is also not round due to the roundness error. . For this reason, if the diameter difference between the two pipes is set to 0.5 mm to 1.0 mm as in the prior art, both the inner surface of the outer joint pipe and the outer surface of the inner joint pipe must be machined with a lathe, resulting in a large cost increase. It becomes.

本発明の目的は、鋼管杭の機械式継手構造の製作が容易な構成とし、且つ安価に提供することである。より具体的に云えば、外継手管および内継手管は必要とする外径及び板厚の鋼管を選択して使用して構成することで、旋盤による周面切削加工の手間を大幅に省略でき、コストを大幅に削減できる、鋼管杭の機械式継手構造を提供する。   An object of the present invention is to provide a structure that allows easy manufacture of a mechanical joint structure of a steel pipe pile and to provide it at a low cost. More specifically, the outer joint pipe and the inner joint pipe can be configured by selecting and using steel pipes with the required outer diameter and thickness, thereby greatly reducing the labor of cutting the peripheral surface with a lathe. To provide a steel pipe pile mechanical joint structure, which can greatly reduce the cost.

上記従来技術の課題を解決するための手段として、請求項１に記載した発明に係る鋼管杭の機械式継手構造は、
２本の鋼管杭を一連に機械式に連結する鋼管杭の機械式継手構造において、
一方の鋼管杭の端面に、周壁に複数の連結用孔が放射方向に穿たれた外継手管が溶接で固着されており、
他方の鋼管杭の対応する端面には、端部金具が溶接で固着され、該端部金具の他側面に前記外継手管の内側へ嵌めることができ周壁に前記外継手管の連結用孔と一致する配置で複数の連結用孔が放射方向に穿たれた内継手管が溶接で固着されており、
前記外継手管の管内へ内継手管が挿入され、外継手管と内継手管それぞれの前記連結用孔を一致させて連結用ピンが挿入され、且つ脱落防止処理が施されて、２本の鋼管杭が連結されていることを特徴とする。 As a means for solving the above-mentioned problems of the prior art, the mechanical joint structure of a steel pipe pile according to the invention described in claim 1 is:
In the mechanical joint structure of steel pipe piles that mechanically connect two steel pipe piles in series,
On the end face of one steel pipe pile, an outer joint pipe with a plurality of connecting holes drilled in the radial direction on the peripheral wall is fixed by welding,
An end fitting is fixed to the corresponding end face of the other steel pipe pile by welding, and can be fitted inside the outer joint pipe to the other side of the end fitting, and a connecting hole for the outer joint pipe is formed on the peripheral wall. The inner joint pipe with a plurality of connecting holes pierced in the radial direction in a matching arrangement is fixed by welding,
An inner joint pipe is inserted into the pipe of the outer joint pipe, the connecting holes of the outer joint pipe and the inner joint pipe are made to coincide with each other, a connection pin is inserted, and a drop prevention process is performed. It is characterized in that steel pipe piles are connected.

請求項２に記載した発明は、請求項１に記載した鋼管杭の機械式継手構造において、
外継手管の内径と内継手管の外径との径差は、外継手管の内径の０．７％以上１．５％以下の範囲に形成されていることを特徴とする。 The invention described in claim 2 is a mechanical joint structure of a steel pipe pile according to claim 1,
A difference in diameter between the inner diameter of the outer joint pipe and the outer diameter of the inner joint pipe is formed in a range of 0.7% to 1.5% of the inner diameter of the outer joint pipe.

請求項３に記載した発明は、請求項１又は２に記載した鋼管杭の機械式継手構造において、
端部金具の形状は、円板形状又は円環形状であることを特徴とする。 The invention described in claim 3 is the mechanical joint structure of the steel pipe pile according to claim 1 or 2,
The shape of the end fitting is a disc shape or an annular shape.

本発明に係る鋼管杭の機械式継手構造は、一方の鋼管杭１の端面に、外継手管３を工場溶接で固着し、他方の鋼管杭２の対応する端面には、端部金具４を工場溶接で固着し、この端部金具４の他側面に、前記外継手管３の内側へ嵌めることができる内継手管５をやはり工場溶接で固着して構成するので、端部金具４と外継手管３および内継手管５は必要とする外径及び板厚の鋼管を選択して使用することができ、また、周面切削加工を大幅に省略できるので、その分の手間とコストを大幅に削減でき、安価な機械式継手構造を提供できる。   In the mechanical joint structure of a steel pipe pile according to the present invention, the outer joint pipe 3 is fixed to the end face of one steel pipe pile 1 by factory welding, and the end fitting 4 is attached to the corresponding end face of the other steel pipe pile 2. Since the inner joint pipe 5 which is fixed by factory welding and can be fitted inside the outer joint pipe 3 on the other side of the end fitting 4 is also fixed by factory welding, the end fitting 4 and the outer metal The joint pipe 3 and the inner joint pipe 5 can be used by selecting and using steel pipes with the required outer diameter and thickness, and the peripheral surface cutting can be largely omitted, so that much labor and cost are greatly reduced. Therefore, an inexpensive mechanical joint structure can be provided.

本発明に係る鋼管杭の機械式継手構造を分解して示す斜視図である。It is a perspective view which decomposes | disassembles and shows the mechanical joint structure of the steel pipe pile which concerns on this invention. 本発明に係る鋼管杭の機械式継手構造を示す斜視図である。It is a perspective view which shows the mechanical joint structure of the steel pipe pile which concerns on this invention. 本発明に係る鋼管杭を機械式継手構造を示す断面図である。It is sectional drawing which shows the mechanical joint structure of the steel pipe pile which concerns on this invention. （Ａ）は図３のＩＶ部拡大図である。（Ｂ）は鋼管杭へ外継手管を溶接する異なる構成を示す拡大図である。(A) is the IV section enlarged view of FIG. (B) is an enlarged view showing a different configuration for welding the outer joint pipe to the steel pipe pile. 図２のＶ−Ｖ矢視断面図である。FIG. 5 is a cross-sectional view taken along line VV in FIG. 2. 連結用孔を千鳥状配置に設けた外継手管を示す斜視図である。It is a perspective view which shows the outer joint pipe | tube which provided the hole for connection in the staggered arrangement | positioning. 本発明に係る鋼管杭の機械式継手構造の異なる実施例を示す断面図である。It is sectional drawing which shows the Example from which the mechanical joint structure of the steel pipe pile which concerns on this invention differs. 従来の鋼管杭の機械式継手構造を示す断面図である。It is sectional drawing which shows the mechanical joint structure of the conventional steel pipe pile.

本発明による鋼管杭の機械式継手構造は、一方の鋼管杭１の端面に、周壁に複数の連結用孔３ａが放射方向に穿たれた外継手管３が溶接ａで固着されており、他方の鋼管杭２の対応する端面には、端部金具４が溶接ｂで固着され、該端部金具４の他側面に前記外継手管３の内側へ嵌めることができ周壁に前記外継手管３の連結用孔３ａと一致する配置で複数の連結用孔５ａが放射方向に穿たれた内継手管５が溶接ｃで固着されている。
前記外継手管３の管内へ内継手管５が挿入され、両管の連結用孔３ａ、５ａを一致させてそれぞれの連結用孔３ａ、５ａへ連結用ピン６が挿入し、脱落防止処理を施して、２本の鋼管杭１、２が連結されている。 In the mechanical joint structure of a steel pipe pile according to the present invention, an outer joint pipe 3 in which a plurality of connecting holes 3a are formed in the peripheral wall in a radial direction is fixed to the end surface of one steel pipe pile 1 by welding a. The end fitting 4 is fixed to the corresponding end face of the steel pipe pile 2 by welding b, and can be fitted to the other side of the end fitting 4 inside the outer joint pipe 3. The inner joint pipe 5 in which a plurality of connecting holes 5a are formed in a radial direction in an arrangement that coincides with the connecting holes 3a is fixed by welding c.
The inner joint pipe 5 is inserted into the pipe of the outer joint pipe 3, the connection holes 3a and 5a of both pipes are aligned, and the connection pins 6 are inserted into the respective connection holes 3a and 5a to prevent the dropout treatment. The two steel pipe piles 1 and 2 are connected.

以下に、本発明に係る鋼管杭の機械式継手構造の構成及び使用法を図示した実施例に基づいて説明する。
図１〜５に示した鋼管杭の機械式継手構造は、一連に連結するべき上下２本の鋼管杭１、２のうち、下位の鋼管杭１の上端面に外継手管３を工場で溶接して固着している。上位の鋼管杭２の対応する下端面には、端部金具４が溶接され、その他側面（下面側）に内継手管５を同じく工場溶接で固着した構成とされている。現場では前記下位の鋼管杭１の外継手管３の中へ、上位の鋼管杭２の内継手管５を嵌め合わせ、連結用ピン６を用いて内外の継手管５と３を結合して、同２本の鋼管杭１、２を一連に機械式に連結して継手構造が完成される。なお、本発明の機械式継手構造は、図３に示す構成を上下逆にした構成でも同様に実施することができる。 Below, the structure and usage method of the mechanical joint structure of the steel pipe pile which concerns on this invention are demonstrated based on the illustrated example.
The mechanical joint structure of steel pipe piles shown in FIGS. 1 to 5 is that the outer joint pipe 3 is welded to the upper end surface of the lower steel pipe pile 1 at the factory among the two upper and lower steel pipe piles 1 and 2 to be connected in series. And is stuck. The end fitting 4 is welded to the corresponding lower end surface of the upper steel pipe pile 2, and the inner joint pipe 5 is similarly fixed to the other side surface (lower surface side) by factory welding. At the site, the inner joint pipe 5 of the upper steel pipe pile 2 is fitted into the outer joint pipe 3 of the lower steel pipe pile 1, and the inner and outer joint pipes 5 and 3 are joined using the connecting pin 6, The two steel pipe piles 1 and 2 are mechanically connected in series to complete the joint structure. Note that the mechanical joint structure of the present invention can be similarly implemented even with a configuration in which the configuration shown in FIG. 3 is turned upside down.

更に詳しく各部の構成を説明する。図示した実施例の鋼管杭１、２は、外径が２１６．３ｍｍ、厚さが８．２ｍｍのもので、下位の鋼管杭１の上端面には、同鋼管杭１の外径と同じ外径で周壁に、一例として４つの連結用孔３ａ…が等間隔の配置で放射方向に穿たれた外継手管３が工場で溶接ａして固着されている。前記連結用孔３ａ…の孔径は、一例として４８．５ｍｍである。
前記外継手管３は、必要とする外径及び板厚の鋼管を選択して加工し使用される。この外継手管３の寸法は、一例として厚さが１４．７ｍｍ、長さが１８３．５ｍｍである。因みに、前記外継手管３を鋼管杭１の端面へ溶接ａする作業は、図４（Ａ）に拡大して示すように、予め外継手管３の内面に、ルートギャップを考慮し鋼管杭１に跨る裏当て材８ａを設置しておいて、管外面側から突き合わせ部を円周方向へ連続溶接して行われる。図示例の場合、外継手管３の下端にレ形の開先が形成されている。前記裏当て材８ａや後述の裏当て材８ｂ及び８ｃが、鋼板等の材質で成る場合には、前記溶接後に取り除いて繰り返し使用できる。なお、図４（Ｂ）に示したように、外継手管３の下端にレ形の開先とともに下方へ突き出る突起部３ｂを形成することで、前記裏当て材８ａは省略できる。また、外継手管３の下端に開先を形成せず、対向する鋼管杭１の上端にレ形の開先を加工した構成でも同様に実施することができる。更に、外継手管３又は鋼管杭１へ開先を形成することなく溶接することもできる。この点は、以下の実施例においても同様とする。
上記連結用孔３ａの個数は、図示した４つに限定されない。例えば図６及び７に示したように、複数設けた構成で実施することもできるし、３つでも実施することができる。また、連結用孔３ａの形状は、図示した円形状に限らず、例えば楕円形状や四角形状でも実施することができる。 The configuration of each part will be described in more detail. The steel pipe piles 1 and 2 of the illustrated embodiment have an outer diameter of 216.3 mm and a thickness of 8.2 mm, and the upper end surface of the lower steel pipe pile 1 has the same outer diameter as the outer diameter of the steel pipe pile 1. As an example, the outer joint pipe 3 having four connecting holes 3a... Drilled in the radial direction at equal intervals is fixed to the peripheral wall by welding at the factory. As an example, the diameter of the connecting hole 3a is 48.5 mm.
The outer joint pipe 3 is processed and used by selecting a steel pipe having a required outer diameter and thickness. For example, the outer joint pipe 3 has a thickness of 14.7 mm and a length of 183.5 mm. Incidentally, the operation of welding the outer joint pipe 3 to the end face of the steel pipe pile 1 is performed in advance on the inner face of the outer joint pipe 3 in consideration of the root gap as shown in an enlarged view in FIG. The backing material 8a straddling is installed, and the butted portion is continuously welded in the circumferential direction from the pipe outer surface side. In the case of the illustrated example, a re-shaped groove is formed at the lower end of the outer joint pipe 3. When the backing material 8a and the below-mentioned backing materials 8b and 8c are made of a material such as a steel plate, they can be removed after the welding and used repeatedly. As shown in FIG. 4 (B), the backing material 8a can be omitted by forming a protruding portion 3b protruding downward together with a reed groove at the lower end of the outer joint pipe 3. Moreover, it can implement similarly also in the structure which did not form a groove | channel in the lower end of the outer joint pipe | tube 3, and processed the ladle-shaped groove | channel in the upper end of the steel pipe pile 1 which opposes. Furthermore, it is possible to weld the outer joint pipe 3 or the steel pipe pile 1 without forming a groove. The same applies to the following embodiments.
The number of the connecting holes 3a is not limited to the four illustrated. For example, as shown in FIGS. 6 and 7, a plurality of configurations can be implemented, or even three can be implemented. Further, the shape of the connecting hole 3a is not limited to the circular shape shown in the figure, and for example, an elliptical shape or a quadrangular shape can be used.

一方、上位の鋼管杭２には、前記下位の鋼管杭１の上端面に対応する下端面に、同鋼管杭２の外径と同じ外径の円環形状の鋼板で成る端部金具４の上面が、工場における溶接ｂで固着されている。この端部金具４は、一例として長さｔ1が１９ｍｍ、厚さｔ２が３１．３ｍｍの円環形状である。前記端部金具４は、厚肉鋼管を短尺切断して製造してもよいし、鋼板を切断して製造してもよい。因みに、前記端部金具４を上位の鋼管杭２の下端面へ溶接ｂする作業は、予め端部金具４の上面に、ルートギャップを考慮し鋼管杭２を跨る裏当て材８ｂを設置し、端部金具４の外隅にレ形の開先を加工して溶接が行われている。なお、端部金具４の外隅に開先を形成せず、対向する鋼管杭２の上端にレ形の開先を加工した構成でも同様に実施することができる。
前記端部金具４は、図示した円環形状に限定されない。図示することは省略したが、例えば円板形状で実施することもできる。鋼板から端部金具４を製造する場合、円形形状は円環形状に比べて切断加工費が安くなるだけでなく、内継手端部の断面形状を抑えるため、継手の曲げ耐力の低下も抑制できるメリットがある。 On the other hand, the upper steel pipe pile 2 has an end fitting 4 made of an annular steel plate having the same outer diameter as the outer diameter of the steel pipe pile 2 on the lower end surface corresponding to the upper end face of the lower steel pipe pile 1. The upper surface is fixed by welding b in the factory. As an example, the end fitting 4 has an annular shape having a length t 1 of 19 mm and a thickness t 2 of 31.3 mm. The end fitting 4 may be manufactured by cutting a thick steel pipe into a short length, or may be manufactured by cutting a steel plate. Incidentally, the work of welding the end fitting 4 to the lower end surface of the upper steel pipe pile 2 is performed by previously installing a backing material 8b straddling the steel pipe pile 2 in consideration of the root gap on the upper surface of the end fitting 4. Welding is performed by processing a groove in the outer corner of the end fitting 4. In addition, it can implement similarly also in the structure which did not form a groove | channel in the outer corner of the edge part metal fitting 4, but processed the ladle-shaped groove | channel on the upper end of the steel pipe pile 2 which opposes.
The end fitting 4 is not limited to the illustrated annular shape. Although illustration is omitted, for example, a disk shape may be used. When manufacturing the end fitting 4 from a steel plate, the circular shape not only has a lower cutting cost than the annular shape, but also suppresses the cross-sectional shape of the end of the inner joint, thereby suppressing a decrease in the bending strength of the joint. There are benefits.

上記端部金具４の下面に、上記外継手管３の内側へ嵌めることができ、周壁に外継手管３の連結用孔３ａ…と一致する配置で４つの連結用孔５ａ…が放射方向に穿たれた内継手管５が、工場における溶接ｃで固着されている。前記内継手管５を端部金具４の下面へ溶接ｃする作業も、予め内継手管３の内面にルートギャップを考慮し端部金具４に跨る裏当て材８ｃを設置しておいて、管外面側から突き合わせ部を円周方向へ連続溶接して行われる。
前記内継手管５も、外継手管３と同様、必要とする外径及び板厚の鋼管を選択して使用される。この内継手管５の寸法は、一例として、外継手管３の内径が１８６．９ｍｍであるのに対して、外径が１８５ｍｍ、厚さが１４．７ｍｍである。前記外継手管３の内径と、内継手管５の外径とに径差（１．９ｍｍ、外継手内径との径差比率１．０２％）があっても、継手部の曲げモーメント耐力を十分に確保できる範囲内の寸法である。なお、内継手管５の外面を荒削りして嵌め合わせを良好にすることもできる。
そして、前記内継手管５の上端部外隅にレ形の開先を形成して、端部金具４との溶接が行われている。 Four connecting holes 5a in the radial direction can be fitted on the lower surface of the end fitting 4 to the inside of the outer joint pipe 3, and arranged on the peripheral wall so as to coincide with the connecting holes 3a of the outer joint pipe 3. The drilled inner joint pipe 5 is fixed by welding c in a factory. In the operation of welding the inner joint pipe 5 to the lower surface of the end fitting 4, a backing material 8 c straddling the end fitting 4 is installed on the inner surface of the inner joint pipe 3 in consideration of the root gap in advance. The butt portion is continuously welded in the circumferential direction from the outer surface side.
Similarly to the outer joint pipe 3, the inner joint pipe 5 is also used by selecting a steel pipe having a required outer diameter and thickness. As an example, the dimensions of the inner joint pipe 5 are an outer diameter of 185 mm and a thickness of 14.7 mm while the inner diameter of the outer joint pipe 3 is 186.9 mm. Even if there is a difference in diameter between the inner diameter of the outer joint pipe 3 and the outer diameter of the inner joint pipe 5 (1.9 mm, the ratio of the diameter difference with the inner diameter of the outer joint is 1.02%), the bending moment strength of the joint portion can be reduced. It is a dimension within a range that can be sufficiently secured. In addition, the outer surface of the inner joint pipe 5 can be roughened to improve the fitting.
The inner joint pipe 5 is welded to the end fitting 4 by forming a re-shaped groove at the outer corner of the upper end portion.

外継手管３の内径と内継手管５の外径との径差は、同外継手管３および内継手管５の周面切削加工を省略するべく、外継手管３の内径の０．７％以上１．５％以下の範囲とすることが好ましい。
その理由は、外継手管３の内径と内継手管５の外径の径差を大きく設定することにより、内継手管５として標準外径の原管をそのまま使用でき、更に真円度誤差を吸収することもできるからである。具体的には、一般の鋼管の真円度は０．５％程度であることから、前記径差を０．７％未満にすると、外継手管３内へ内継手管５を挿入できなくなる虞がある。また、前記径差を大きくし過ぎると、継手の曲げモーメント耐力を低下させる。発明者が行った曲げ試験によると、両管３、５の前記径差を１．２％に設定した試験では、曲げ耐力が約２％低下した程度であったが、両管３、５の前記径差が１．８％では約１５％低下した。そこで、両管３、５の前記径差は、外継手管３の内径の０．７％以上１．５％以下に設定するのがよいことがわかった。前記の範囲内で径差を設けることで、外継手管３の内面と内継手管５の外面の一方または両方について切削加工を省略して形成できるとともに、継手の曲げ耐力の低下も防ぐことができる。 The diameter difference between the inner diameter of the outer joint pipe 3 and the outer diameter of the inner joint pipe 5 is 0.7% of the inner diameter of the outer joint pipe 3 so as to omit the peripheral surface cutting of the outer joint pipe 3 and the inner joint pipe 5. % To 1.5% or less is preferable.
The reason is that by setting a large difference between the inner diameter of the outer joint pipe 3 and the outer diameter of the inner joint pipe 5, the standard outer diameter original pipe can be used as it is as the inner joint pipe 5, and the roundness error is further reduced. This is because it can be absorbed. Specifically, since the roundness of a general steel pipe is about 0.5%, the inner joint pipe 5 may not be inserted into the outer joint pipe 3 if the diameter difference is less than 0.7%. There is. Moreover, if the diameter difference is too large, the bending moment proof stress of the joint is reduced. According to the bending test conducted by the inventor, in the test in which the diameter difference between the pipes 3 and 5 was set to 1.2%, the bending proof strength was about 2% lower. When the diameter difference was 1.8%, the diameter decreased by about 15%. Therefore, it has been found that the diameter difference between the pipes 3 and 5 is preferably set to 0.7% or more and 1.5% or less of the inner diameter of the outer joint pipe 3. By providing a difference in diameter within the above range, one or both of the inner surface of the outer joint pipe 3 and the outer surface of the inner joint pipe 5 can be formed without cutting, and it is possible to prevent a decrease in the bending strength of the joint. it can.

上記内継手管５の長さは、１５９ｍｍである。内継手管５の長さについては、鋼管杭２の外径の０．６倍〜１．２倍の寸法とするのが好ましい。したがって、鋼管杭２の外径が上記した２１６．３ｍｍであれば、内継手管５の長さは、１２９．８ｍｍ〜２５９．６ｍｍの範囲であれば足りる。以下に、その理由を概説する。
前記内継手管５と外継手管３は、圧縮力及び引張力が作用すると、それぞれ反対方向に回転しようとして互いに管軸方向に対して直角方向に押し合う。その押圧力が偶力となってモーメントが伝達される。そして、このモーメント伝達量は内継手管５の長さ（内継手管５と外継手管３とが重なる長さ）にほぼ比例するので、前記内継手管５が長いほど大きなモーメントを伝達できるのである。例えば、内継手管５の長さが鋼管杭２の外径の０．６倍未満であると、内継手管５と外継手管３とのこじり合いにより発生するモーメントは、鋼管杭２の曲げモーメント耐力の３割以下になり、残りのモーメントをピン部の伝達に分担させるため、継手管の壁厚を厚くしたり、或いは後述する連結用ピン６の本数を増やさなければならない。また、継手部の曲げ剛性は著しく低下し、設計上問題となる。一方、内継手管５の長さを鋼管杭２の外径の１．２倍以上とすると、曲げ耐力は増加するものの、コストの上昇に見合った効果が得られない。そこで、前記内継手管５の長さを、鋼管杭２の外径の０．６倍〜１．２倍の寸法とすることで好適に実施することができる。 The inner joint pipe 5 has a length of 159 mm. The length of the inner joint pipe 5 is preferably 0.6 to 1.2 times the outer diameter of the steel pipe pile 2. Therefore, if the outer diameter of the steel pipe pile 2 is 216.3 mm as described above, the length of the inner joint pipe 5 may be in the range of 129.8 mm to 259.6 mm. The reason is outlined below.
When the compressive force and the tensile force are applied, the inner joint pipe 5 and the outer joint pipe 3 press each other in a direction perpendicular to the pipe axis direction so as to rotate in opposite directions. The pressing force becomes a couple and a moment is transmitted. Since this moment transmission amount is substantially proportional to the length of the inner joint pipe 5 (the length in which the inner joint pipe 5 and the outer joint pipe 3 overlap), a larger moment can be transmitted as the inner joint pipe 5 becomes longer. is there. For example, when the length of the inner joint pipe 5 is less than 0.6 times the outer diameter of the steel pipe pile 2, the moment generated by the twisting of the inner joint pipe 5 and the outer joint pipe 3 is the bending of the steel pipe pile 2. In order to reduce the moment proof strength to 30% or less and share the remaining moment for the transmission of the pin portion, it is necessary to increase the wall thickness of the joint pipe or increase the number of connecting pins 6 described later. Further, the bending rigidity of the joint portion is significantly lowered, which causes a design problem. On the other hand, when the length of the inner joint pipe 5 is 1.2 times or more the outer diameter of the steel pipe pile 2, the bending strength increases, but an effect commensurate with the increase in cost cannot be obtained. Then, it can implement suitably by making the length of the said inner joint pipe | tube 5 into 0.6 to 1.2 times the outer diameter of the steel pipe pile 2. FIG.

連結ピンの脱落防止処理の一例として、図３及び５に示す実施例では、上記内継手管５の管内面側には、前記連結用孔５ａの内側開口を全部塞ぐ配置で、後述する止めボルト７をねじ込むボルト孔７ａを有する係止部材５ｂが、やはり工場における溶接で固着されている。但し、前記係止部材５ｂは、連結用孔５ａの内側開口の一部分を塞ぐ配置に横断させ固着した構成で実施することもできる。また、図８の従来例に示すように、係止部材５を円環形状とした構成で実施することもできる。   As an example of the connection pin drop-off prevention process, in the embodiment shown in FIGS. 3 and 5, the inner surface of the inner joint pipe 5 is arranged so as to block all the inner openings of the connection holes 5a, and will be described later. A locking member 5b having a bolt hole 7a into which the screw 7 is screwed is also fixed by welding in a factory. However, the locking member 5b can also be implemented in a configuration in which the locking member 5b is traversed and fixed so as to block a part of the inner opening of the connecting hole 5a. In addition, as shown in the conventional example of FIG. 8, the locking member 5 can be implemented in a ring shape.

次に、上記２本の鋼管杭１、２の現場における連結作業について説明する。図１に示すように、下位の鋼管杭１に固着され上向きに開口する外継手管３の管内へ、上位の鋼管杭２を杭打ち機等で吊り下げ、その下端に固着された内継手管５を挿入して嵌め合わせる。そして、内外の継手管３と５の各連結用孔３ａと５ａを一致させ、一致させた連結用孔３ａ、５ａへ、同連結用孔３ａ、５ａよりも僅かに径が小さい連結用ピン（図示した実施例では円柱体）を、内継手管５内の係止部材５ｂに突き当たるまで挿入する。そして、前記連結用ピン６のボルト通し孔６ａへ止めボルト７のネジ軸部を挿入し、該ネジ軸部７の先端部を係止部材５ｂのボルト孔へねじ込み締結して、２本の鋼管杭１、２を連結する。なお、図示することは省略したが、止めボルト７の頭部は、前記連結用ピン６に同止めボルト７の頭部を収納できる凹部を設けて、該ボルト７の頭部を管外面から突き出ないように収納した構成で実施することもできる。   Next, the connection work in the field of the said two steel pipe piles 1 and 2 is demonstrated. As shown in FIG. 1, an inner joint pipe fixed to the lower end of a steel pipe pile 2 is suspended in a pipe of an outer joint pipe 3 fixed to the lower steel pipe pile 1 and opened upward with a pile driving machine or the like. Insert 5 and fit. Then, the connecting holes 3a and 5a of the inner and outer joint pipes 3 and 5 are made to coincide with each other, and the connecting holes 3a and 5a are connected to the connecting pins 3a and 5a having a slightly smaller diameter than the connecting holes 3a and 5a ( In the illustrated embodiment, the cylindrical body) is inserted until it hits the locking member 5b in the inner joint pipe 5. Then, the screw shaft portion of the set bolt 7 is inserted into the bolt through hole 6a of the connecting pin 6, and the tip end portion of the screw shaft portion 7 is screwed into the bolt hole of the locking member 5b and fastened. The piles 1 and 2 are connected. Although not shown in the figure, the head of the set bolt 7 is provided with a recess capable of accommodating the head of the set bolt 7 in the connecting pin 6 so that the head of the bolt 7 protrudes from the outer surface of the pipe. It can also be implemented in a configuration that is housed so that there is no such thing.

上述した本実施例の鋼管杭の機械式継手構造と、従来の鋼管杭の機械式継手構造の製作費用を比較検討する。
従来の鋼管杭の機械式継手構造では、外継手管３として、外径が２１６．３ｍｍ、厚さが１５ｍｍ、長さが１７３．５ｍｍの標準規格で成る鋼管を切削加工して真円度を高めて、外径が２１６．３ｍｍ、厚さが１４．５ｍｍ、長さが１７３．５ｍｍにする。
また、内継手管５として、外径が２１６．３ｍｍで、厚さが２９．５ｍｍ、長さが１７８ｍｍで成る特殊鋼管を切削加工して、前記外継手管３内へ嵌め込む部分の寸法を外径１８７．３ｍｍで、厚さが１４．５ｍｍ、長さ１５９ｍｍにする。上記段落番号［０００５］で説明したように、前記内継手管５は、鋼管杭１、２の外径と、当該内継手管５の内径との寸法差Ｓに相当する厚さの厚板鋼管の外周面を、当該内継手管５の嵌め込み長さＬにわたり、例えば旋盤により外継手管３の内側へ密接する外径まで切削加工する必要があるからである。切削加工前の外継手管３と内継手管５を合わせた重量は３７．１ｋｇである。また、外継手管３と内継手管５の旋盤加工による切削量は、１．５９９×１０−３ｍ３ にもなる。 The manufacturing cost of the mechanical joint structure of the steel pipe pile of the above-described embodiment and the conventional mechanical joint structure of the steel pipe pile will be compared.
In the conventional mechanical joint structure of steel pipe piles, the outer joint pipe 3 has a roundness by cutting a standard steel pipe having an outer diameter of 216.3 mm, a thickness of 15 mm, and a length of 173.5 mm. The outer diameter is 216.3 mm, the thickness is 14.5 mm, and the length is 173.5 mm.
Also, as the inner joint pipe 5, a special steel pipe having an outer diameter of 216.3 mm, a thickness of 29.5 mm, and a length of 178 mm is cut and the size of the portion to be fitted into the outer joint pipe 3 is set. The outer diameter is 187.3 mm, the thickness is 14.5 mm, and the length is 159 mm. As described in paragraph [0005] above, the inner joint pipe 5 is a thick steel pipe having a thickness corresponding to the dimensional difference S between the outer diameter of the steel pipe piles 1 and 2 and the inner diameter of the inner joint pipe 5. This is because the outer peripheral surface of the inner joint pipe 5 needs to be cut to the outer diameter close to the inner side of the outer joint pipe 3 by, for example, a lathe, over the fitting length L of the inner joint pipe 5. The combined weight of the outer joint pipe 3 and the inner joint pipe 5 before cutting is 37.1 kg. Moreover, the cutting amount by the lathe processing of the outer joint pipe 3 and the inner joint pipe 5 is 1.599 × 10 −3 m 3 .

一方、上記寸法からなる本実施例の鋼管杭の機械式継手構造は、外継手管３として、外径が２１６．３ｍｍ、内径が１８８．３ｍｍ、厚さが１４．７ｍｍ、長さが１８３．５ｍｍの標準規格で成る鋼管をそのまま使用する。また、内継手管５は、外径が１８５ｍｍで、厚さが１４．７ｍｍ、長さが１５９ｍｍの標準規格で成る鋼管をそのまま使用する。前記外継手管３と内継手管５を合わせた重量は２８．７ｋｇである。そして、外継手管３と内継手管５は、切削加工を省略できるので、切削量は０である。
したがって、本実施例の鋼管杭の機械式継手構造では、従来の鋼管杭の機械式継手構造と比較して購入鋼材の総重量が２３％減であり、安価な鋼管を購入して使用できるし、周面切削加工を大幅に省略できるので、その分の手間とコストを大幅に削減できる。 On the other hand, the mechanical joint structure of the steel pipe pile of the present embodiment having the above dimensions is the outer joint pipe 3 having an outer diameter of 216.3 mm, an inner diameter of 188.3 mm, a thickness of 14.7 mm, and a length of 183. A steel pipe with a standard of 5 mm is used as it is. As the inner joint pipe 5, a steel pipe made of a standard standard having an outer diameter of 185 mm, a thickness of 14.7 mm, and a length of 159 mm is used as it is. The combined weight of the outer joint pipe 3 and the inner joint pipe 5 is 28.7 kg. Since the outer joint pipe 3 and the inner joint pipe 5 can omit the cutting process, the cutting amount is zero.
Therefore, in the mechanical joint structure of the steel pipe pile of the present embodiment, the total weight of the purchased steel material is reduced by 23% compared to the mechanical joint structure of the conventional steel pipe pile, and an inexpensive steel pipe can be purchased and used. Since the peripheral surface cutting can be largely omitted, it is possible to greatly reduce the labor and cost.

本発明に係る鋼管杭の機械式継手構造の異なる実施例として、図７に示すように、外継手管３の外径や、端部金具４の外面は、周面摩擦の劣化を防止する許容寸法として、鋼管杭１の外面よりも約１０ｍｍ外方へ突き出す寸法で実施することができる。一例として、鋼管杭１、２の外径が３５５．６ｍｍ、厚さが１２、７ｍｍであるのに対し、外継手管３の外径が３６５．１ｍｍ、厚さが１８．５ｍｍ、長さが２９２ｍｍ、端部金具４の外径が３６５．１ｍｍ、長さｔ1が２５ｍｍ、厚さがｔ２が４０．６ｍｍとする。
また、内継手管５は、一例として、外継手管３の内径が３２８．１ｍｍであるのに対して、外径が３２３．９ｍｍで厚さが２０ｍｍ、２６７．５ｍｍとする。前記外継手管３の内径と、内継手管５の外径とに径差（４．２ｍｍ、外継手内径との径差比率１．２８％）があっても、内継手管５を外継手管３内へ挿入ができ、且つ継手部の曲げモーメント耐力を十分に確保できる範囲内の寸法である。 As different embodiments of the mechanical joint structure of the steel pipe pile according to the present invention, as shown in FIG. 7, the outer diameter of the outer joint pipe 3 and the outer surface of the end fitting 4 are allowed to prevent deterioration of peripheral friction. As a dimension, it can implement by the dimension which protrudes about 10 mm outward from the outer surface of the steel pipe pile 1. FIG. As an example, the outer diameter of the steel pipe piles 1 and 2 is 355.6 mm and the thickness is 12 and 7 mm, whereas the outer diameter of the outer joint pipe 3 is 365.1 mm, the thickness is 18.5 mm, and the length is The outer diameter of the end fitting 4 is 365.1 mm, the length t 1 is 25 mm, and the thickness t 2 is 40.6 mm.
As an example, the inner joint pipe 5 has an outer diameter of 323.9 mm, a thickness of 20 mm, and 267.5 mm, whereas the outer joint pipe 3 has an inner diameter of 328.1 mm. Even if there is a difference in diameter between the inner diameter of the outer joint pipe 3 and the outer diameter of the inner joint pipe 5 (4.2 mm, a diameter difference ratio of 1.28% from the inner diameter of the outer joint), the inner joint pipe 5 is It is a dimension within a range that can be inserted into the tube 3 and can sufficiently secure the bending moment proof stress of the joint portion.

本発明に係る鋼管杭の機械式継手構造の更に異なる実施例として、継手管の円周方向に多数の連結用孔を一列に配置させると開口部横断面の欠損面積が大きくなる場合には、図６及び７に示すように、管軸方向へ千鳥状配置に設けた構成で実施する。図７に示す実施例では、上下に位置する連結用孔５ａ、５ａの中心間の高さ寸法差が７０ｍｍである。つまり、開口部横断面の欠損面積が小さくなり、継手部の各種耐力が低下することを防止できる。   As a further different embodiment of the mechanical joint structure of the steel pipe pile according to the present invention, when a large number of holes for connection are arranged in a row in the circumferential direction of the joint pipe, the loss area of the opening cross section becomes large, As shown in FIGS. 6 and 7, the configuration is provided in a staggered arrangement in the tube axis direction. In the embodiment shown in FIG. 7, the height dimensional difference between the centers of the connecting holes 5a and 5a positioned above and below is 70 mm. That is, it is possible to prevent the defect area of the cross section of the opening from being reduced and reduce the various proof stresses of the joint.

以上に本発明を図示した実施例に基づいて説明したが、もとより本発明は、上述した実施の形態や実施例に限定されるものではない。いわゆる当業者が必要に応じて通常行う設計変更や応用の範囲内で様々な実施の形態が可能である。   Although the present invention has been described above based on the illustrated examples, the present invention is not limited to the above-described embodiments and examples. Various embodiments are possible within the scope of design changes and applications usually performed by those skilled in the art as necessary.

１ 鋼管杭
２ 鋼管杭
３ 外継手管
３ａ 連結用孔
４ 端部金具
５ 内継手管
５ａ 連結用孔
６ 連結用ピン DESCRIPTION OF SYMBOLS 1 Steel pipe pile 2 Steel pipe pile 3 Outer joint pipe 3a Connection hole 4 End metal fitting 5 Inner joint pipe 5a Connection hole 6 Connection pin

Claims (3)

２本の鋼管杭を一連に機械式に連結する鋼管杭の機械式継手構造において、
一方の鋼管杭の端面に、周壁に複数の連結用孔が放射方向に穿たれた外継手管が溶接で固着されており、
他方の鋼管杭の対応する端面には、端部金具が溶接で固着され、該端部金具の他側面に前記外継手管の内側へ嵌めることができ周壁に前記外継手管の連結用孔と一致する配置で複数の連結用孔が放射方向に穿たれた内継手管が溶接で固着されており、
前記外継手管の管内へ内継手管が挿入され、外継手管と内継手管それぞれの前記連結用孔を一致させて連結用ピンが挿入され、且つ脱落防止処理が施されて、２本の鋼管杭が連結されていることを特徴とする、鋼管杭の機械式継手構造。 In the mechanical joint structure of steel pipe piles that mechanically connect two steel pipe piles in series,
On the end face of one steel pipe pile, an outer joint pipe with a plurality of connecting holes drilled in the radial direction on the peripheral wall is fixed by welding,
An end fitting is fixed to the corresponding end face of the other steel pipe pile by welding, and can be fitted inside the outer joint pipe to the other side of the end fitting, and a connecting hole for the outer joint pipe is formed on the peripheral wall. The inner joint pipe with a plurality of connecting holes pierced in the radial direction in a matching arrangement is fixed by welding,
An inner joint pipe is inserted into the pipe of the outer joint pipe, the connecting holes of the outer joint pipe and the inner joint pipe are made to coincide with each other, a connection pin is inserted, and a drop prevention process is performed. A mechanical joint structure for steel pipe piles, wherein the steel pipe piles are connected. 外継手管の内径と内継手管の外径との径差は、外継手管の内径の０．７％以上１．５％以下の範囲に形成されていることを特徴とする、請求項１に記載した鋼管杭の機械式継手構造。   The diameter difference between the inner diameter of the outer joint pipe and the outer diameter of the inner joint pipe is formed in a range of 0.7% to 1.5% of the inner diameter of the outer joint pipe. The mechanical joint structure of steel pipe piles described in 1. 端部金具の形状は、円板形状又は円環形状であることを特徴とする、請求項１又は２に記載した鋼管杭の機械式継手構造。   The steel pipe pile mechanical joint structure according to claim 1 or 2, wherein the shape of the end fitting is a disc shape or an annular shape.
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