JP2021055290A

JP2021055290A - Joint structure for steel pipe, rotary pipe with blade at tip, and joint method for steel pipe

Info

Publication number: JP2021055290A
Application number: JP2019177148A
Authority: JP
Inventors: 栄丸山; Sakae Maruyama; 慎太郎田原; Shintaro Tahara; 昌敏和田; Masatoshi Wada; 浩平古谷; Kohei Furuya; 孝俊徳岡; Takatoshi TOKUOKA
Original assignee: Nippon Steel Metal Products Co Ltd
Current assignee: Nippon Steel Metal Products Co Ltd
Priority date: 2019-09-27
Filing date: 2019-09-27
Publication date: 2021-04-08

Abstract

To join steel pipes with a joint part in a simple shape.SOLUTION: A steel pipe joint structure for joining a first steel pipe and a second steel pipe in a pipe axis direction is provided with: a first joint part formed in a cylindrical shape of which the axis is in a pipe axis direction and having a first end surface nonvertically to the pipe axis direction at least in part; a second joint part formed in a cylindrical shape of which the axis is in a pipe axis direction and having a second end surface complementary to the first end surface through contacting the first end surface; and a pipe-shaped member fitting the inner side or the outer side of the first joint part and the second joint part.SELECTED DRAWING: Figure 1

Description

本発明は、鋼管の連結構造、先端羽根付き回転杭および鋼管の連結方法に関する。 The present invention relates to a connecting structure of steel pipes, a rotary pile with tip blades, and a method of connecting steel pipes.

溶接によらない機械式の鋼管の連結構造として、例えば特許文献１に記載されたようなものが提案されている。特許文献１に記載された鋼管杭の継手構造では、従来用いられてきたねじ式のものに比べて施工が容易であり、また部材の板厚を確保しながら偏心曲げモーメントを低減することができる。 As a mechanical steel pipe connecting structure that does not rely on welding, for example, the one described in Patent Document 1 has been proposed. The joint structure of the steel pipe pile described in Patent Document 1 is easier to construct than the screw type that has been conventionally used, and the eccentric bending moment can be reduced while ensuring the plate thickness of the member. ..

特開２０１９−９０２３３号公報Japanese Unexamined Patent Publication No. 2019-90233

しかしながら、特許文献１などに記載された従来の連結構造は、鋼管の端部に溶接などによって予め接合される連結部材の形状が複雑である。連結部材は肉厚鋼管の特殊な切削加工によって製造されるため、素材になる鋼管が入手しにくく、加工が可能な製造者も限られる。結果として、連結部材の製造には時間とコストがかかる。また、鋼管の連結後に連結部材がかみ合っている部分を外部から観察できないため連結状態を精度よく確認することが難しい。さらに、連結部材の重量が大きくなるため、鋼管に連結部材を溶接したり、連結部材が溶接された鋼管を運搬したりする際の作業性が悪い。 However, in the conventional connecting structure described in Patent Document 1 and the like, the shape of the connecting member to be previously joined to the end of the steel pipe by welding or the like is complicated. Since the connecting member is manufactured by a special cutting process of a thick steel pipe, it is difficult to obtain a steel pipe as a material, and the number of manufacturers who can process it is limited. As a result, manufacturing the connecting member is time consuming and costly. In addition, it is difficult to accurately confirm the connected state because the portion where the connecting members are engaged cannot be observed from the outside after the steel pipes are connected. Further, since the weight of the connecting member is increased, the workability when welding the connecting member to the steel pipe or transporting the steel pipe to which the connecting member is welded is poor.

そこで、本発明は、形状が単純であることによって、加工や連結状態の確認が容易であり、また連結部材の重量を抑えることで施工性を向上させることが可能な鋼管の連結構造、先端羽根付き回転杭および鋼管の連結方法を提供することを目的とする。 Therefore, according to the present invention, since the shape is simple, it is easy to check the processing and the connected state, and the workability can be improved by reducing the weight of the connecting member. It is an object of the present invention to provide a method of connecting a rotary pile with a steel pipe and a steel pipe.

［１］第１の鋼管と第２の鋼管とを管軸方向に連結する鋼管の連結構造であって、
前記管軸方向を軸とする円筒状に形成され、少なくとも部分的に前記管軸方向に対して非垂直な第１の端面を有する第１の連結部と、
前記管軸方向を軸とする円筒状に形成され、前記第１の端面に接触し前記第１の端面に対して相補的な形状の第２の端面を有する第２の連結部と、
前記第１の連結部および前記第２の連結部の内側または外側に嵌合する管状部材と
を備える鋼管の連結構造。
［２］前記第１の連結部および前記第２の連結部にまたがって配置されるキー部材をさらに備え、
前記キー部材が配置される部分では前記第１の端面および前記第２の端面がそれぞれ前記キー部材に接触し、それ以外の部分では前記第１の端面および前記第２の端面が互いに接触する、［１］に記載の鋼管の連結構造。
［３］前記管状部材は、前記第１の連結部および前記第２の連結部の外側に嵌合し、前記管状部材の外側から前記キー部材に挿通されるボルトまたはピンを用いて固定される、［２］に記載の鋼管の連結構造。
［４］前記管状部材は、前記第１の連結部および前記第２の連結部の外側に嵌合し、前記管状部材の外側から前記第１の連結部または前記第２の連結部に挿通されるボルトまたはピンを用いて固定される、［１］から［３］のいずれか１項に記載の鋼管の連結構造。
［５］前記第１の端面および前記第２の端面は、前記管軸方向に直交する少なくとも１つの方向について互いに干渉しない形状を有する、［１］から［４］のいずれか１項に記載の鋼管の連結構造。
［６］前記第１の連結部および前記第２の連結部の少なくともいずれかは、前記第１の鋼管および前記第２の鋼管とは別の部材であり、前記第１の鋼管または前記第２の鋼管に接合される、［１］から［５］のいずれか１項に記載の鋼管の連結構造。
［７］前記第１の連結部および前記第２の連結部は、前記第１の鋼管および前記第２の鋼管とは別の部材であり、互いに同じ形状を有する、［６］に記載の鋼管の連結構造。
［８］前記第１の連結部および前記第２の連結部の少なくともいずれかは、前記第１の鋼管または前記第２の鋼管の一部であり、前記第１の鋼管または前記第２の鋼管の端部に形成される、［１］から［６］のいずれか１項に記載の鋼管の連結構造。
［９］前記第１の鋼管および前記第２の鋼管は、先端羽根付き回転杭を構成する、［１］から［８］のいずれか１項に記載の鋼管の連結構造。
［１０］［１］から［９］のいずれか１項に記載の鋼管の連結構造を用いた先端羽根付き回転杭。
［１１］第１の鋼管と第２の鋼管とを管軸方向に連結する鋼管の連結方法であって、
前記第１の鋼管と同軸の円筒状に形成され、前記第１の鋼管とは反対側に位置する第１の端面が少なくとも部分的に前記管軸方向に対して非垂直な形状を有する第１の連結部と、前記第２の鋼管と同軸の円筒状に形成され、前記第２の鋼管とは反対側に位置する第２の端面が前記第１の端面に対して相補的な形状を有する第２の連結部とを、前記第１の端面と前記第２の端面とが互いに接触するように嵌合させる工程と、
前記第１の連結部および前記第２の連結部の内側または外側に管状部材を嵌合させる工程と
を含む鋼管の連結方法。
［１２］前記第１の端面および前記第２の端面は、前記管軸方向に直交する少なくとも１つの方向について互いに干渉しない形状を有し、
前記第１の連結部を、前記少なくとも１つの方向で前記第２の連結部に向けて移動させることによって、前記第１の連結部と前記第２の連結部とを嵌合させる、［１１］に記載の鋼管の連結方法。
［１３］前記第１の連結部と前記第２の連結部とを嵌合させる工程と、前記管状部材を嵌合させる工程との間に、前記第１の端面と前記第２の端面との間に部分的に形成された隙間にキー部材を嵌合させる工程をさらに含む、［１１］または［１２］に記載の鋼管の連結方法。 [1] A steel pipe connecting structure for connecting a first steel pipe and a second steel pipe in the pipe axis direction.
A first connecting portion formed in a cylindrical shape with the pipe axis direction as an axis and having a first end face which is at least partially perpendicular to the pipe axis direction.
A second connecting portion which is formed in a cylindrical shape about the pipe axis direction and has a second end face which is in contact with the first end face and has a shape complementary to the first end face.
A connecting structure of a steel pipe including a first connecting portion and a tubular member fitted inside or outside the second connecting portion.
[2] Further provided with a key member arranged across the first connecting portion and the second connecting portion.
In the portion where the key member is arranged, the first end face and the second end face are in contact with the key member, respectively, and in other parts, the first end face and the second end face are in contact with each other. The steel pipe connecting structure according to [1].
[3] The tubular member is fitted to the outside of the first connecting portion and the second connecting portion, and is fixed by using a bolt or a pin inserted into the key member from the outside of the tubular member. , [2] The connecting structure of the steel pipe.
[4] The tubular member is fitted to the outside of the first connecting portion and the second connecting portion, and is inserted from the outside of the tubular member into the first connecting portion or the second connecting portion. The steel pipe connecting structure according to any one of [1] to [3], which is fixed by using a bolt or a pin.
[5] The item according to any one of [1] to [4], wherein the first end face and the second end face have a shape that does not interfere with each other in at least one direction orthogonal to the pipe axis direction. Connection structure of steel pipe.
[6] At least one of the first connecting portion and the second connecting portion is a member different from the first steel pipe and the second steel pipe, and is the first steel pipe or the second steel pipe. The connecting structure of the steel pipe according to any one of [1] to [5], which is joined to the steel pipe of.
[7] The steel pipe according to [6], wherein the first connecting portion and the second connecting portion are members different from the first steel pipe and the second steel pipe and have the same shape as each other. Connection structure.
[8] At least one of the first connecting portion and the second connecting portion is a part of the first steel pipe or the second steel pipe, and the first steel pipe or the second steel pipe. The steel pipe connecting structure according to any one of [1] to [6], which is formed at the end of the steel pipe.
[9] The steel pipe connecting structure according to any one of [1] to [8], wherein the first steel pipe and the second steel pipe form a rotary pile with tip blades.
[10] A rotary pile with tip blades using the steel pipe connecting structure according to any one of [1] to [9].
[11] A method of connecting a steel pipe that connects a first steel pipe and a second steel pipe in the pipe axis direction.
A first steel pipe formed in a cylindrical shape coaxial with the first steel pipe, and having a first end face located on the opposite side of the first steel pipe at least partially perpendicular to the pipe axis direction. The second end face, which is formed in a cylindrical shape coaxial with the second steel pipe and is located on the opposite side of the second steel pipe, has a shape complementary to the first end face. A step of fitting the second connecting portion so that the first end face and the second end face are in contact with each other.
A method for connecting a steel pipe, which comprises a step of fitting a tubular member inside or outside the first connecting portion and the second connecting portion.
[12] The first end face and the second end face have a shape that does not interfere with each other in at least one direction orthogonal to the pipe axis direction.
By moving the first connecting portion toward the second connecting portion in at least one direction, the first connecting portion and the second connecting portion are fitted to each other [11]. The method for connecting steel pipes according to.
[13] Between the step of fitting the first connecting portion and the second connecting portion and the step of fitting the tubular member, the first end face and the second end face are formed. The method for connecting steel pipes according to [11] or [12], further comprising a step of fitting a key member into a gap partially formed between them.

上記の構成によれば、連結構造の形状が単純であることによって、加工や連結状態の確認が容易であり、また連結部材の重量を抑えることで施工性を向上させることができる。 According to the above configuration, since the shape of the connecting structure is simple, it is easy to process and check the connecting state, and it is possible to improve the workability by suppressing the weight of the connecting member.

本発明の第１の実施形態に係る鋼管の連結構造を示す斜視図である。It is a perspective view which shows the connecting structure of the steel pipe which concerns on 1st Embodiment of this invention. 本発明の第１の実施形態に係る鋼管の連結構造を示す斜視図である。It is a perspective view which shows the connecting structure of the steel pipe which concerns on 1st Embodiment of this invention. 本発明の第１の実施形態に係る鋼管の連結構造を示す斜視図である。It is a perspective view which shows the connecting structure of the steel pipe which concerns on 1st Embodiment of this invention. 図１にIVで示した連結部の周方向の展開図である。FIG. 1 is a development view of the connecting portion shown by IV in FIG. 1 in the circumferential direction. 図１に示した連結構造の部材を鋼管から切り出して製造する例を示す斜視図である。It is a perspective view which shows the example of cutting out the member of the connecting structure shown in FIG. 1 from a steel pipe, and manufacturing it. 本発明の第２の実施形態に係る鋼管の連結構造を示す展開図である。It is a developed view which shows the connecting structure of the steel pipe which concerns on 2nd Embodiment of this invention. 本発明の第３の実施形態に係る鋼管の連結構造を示す展開図である。It is a developed view which shows the connecting structure of the steel pipe which concerns on 3rd Embodiment of this invention. 本発明の実施形態に係る連結構造を用いた施工方法の例を示す図である。It is a figure which shows the example of the construction method using the connection structure which concerns on embodiment of this invention. 本発明の実施形態に係る連結構造を用いた先端羽根付き回転杭の施工方法の例を示す図である。It is a figure which shows the example of the construction method of the rotary pile with a tip blade using the connection structure which concerns on embodiment of this invention.

以下に添付図面を参照しながら、本発明の好適な実施形態について詳細に説明する。なお、本明細書および図面において、実質的に同一の機能構成を有する構成要素については、同一の符号を付することにより重複説明を省略する。 Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the present specification and the drawings, components having substantially the same functional configuration are designated by the same reference numerals, so that duplicate description will be omitted.

（第１の実施形態）
図１から図３は、本発明の第１の実施形態に係る鋼管の連結構造を示す斜視図である。図示された例において、連結構造１０は、第１の連結部１１と、第２の連結部１２と、管状部材１３とを含む。後述するように、第１の連結部１１および第２の連結部１２は、連結構造１０によって連結される鋼管にそれぞれ接合される鋼管とは別の部材であってもよいし、連結構造１０によって連結される鋼管のそれぞれの一部が第１の連結部１１および第２の連結部１２であってもよい。 (First Embodiment)
1 to 3 are perspective views showing a connecting structure of steel pipes according to the first embodiment of the present invention. In the illustrated example, the connecting structure 10 includes a first connecting portion 11, a second connecting portion 12, and a tubular member 13. As will be described later, the first connecting portion 11 and the second connecting portion 12 may be members different from the steel pipes joined to the steel pipes connected by the connecting structure 10, respectively, or may be formed by the connecting structure 10. Each part of the steel pipe to be connected may be a first connecting portion 11 and a second connecting portion 12.

図１に示されるように、連結構造１０では、第１の連結部１１および第２の連結部１２が連結される鋼管の管軸方向（ｘ方向として図示する）を軸とする円筒状に形成され、互いに対向する側の端面（以下、第１の連結部１１の端面を第１の端面１１Ｅ、第２の連結部１２の端面を第２の端面１２Ｅとして説明する）が互いに接触する。後述するように、第１の端面１１Ｅが少なくとも部分的に管軸方向に対して非垂直な形状を有し、第２の端面１２Ｅが第１の端面に対して相補的な形状を有することによって、第１の連結部１１と第２の連結部１２との間で管軸回りの回転トルクが伝達される。 As shown in FIG. 1, in the connecting structure 10, the first connecting portion 11 and the second connecting portion 12 are formed in a cylindrical shape about the pipe axis direction (shown as the x direction) of the steel pipe to which the first connecting portion 11 and the second connecting portion 12 are connected. Then, the end faces on the opposite sides (hereinafter, the end face of the first connecting portion 11 is referred to as the first end face 11E and the end face of the second connecting portion 12 is referred to as the second end face 12E) come into contact with each other. As will be described later, the first end face 11E has a shape that is at least partially non-vertical to the pipe axis direction, and the second end face 12E has a shape that is complementary to the first end face. , The rotational torque around the pipe axis is transmitted between the first connecting portion 11 and the second connecting portion 12.

また、本実施形態では、第１の連結部１１および第２の連結部１２にまたがってキー部材１４が配置される。図１に示されるように、キー部材１４が配置される部分では第１の端面１１Ｅおよび第２の端面１２Ｅがそれぞれキー部材１４に接触し、それ以外の部分では第１の端面１１Ｅおよび第２の端面１２Ｅが互いに接触する。キー部材１４は、例えば第１の端面１１Ｅと第２の端面１２Ｅとの間に形成される孔部１４Ａに嵌合する。キー部材１４および孔部１４Ａは、互いに対応するテーパー形状を有してもよい。この場合、外側からキー部材１４を孔部１４Ａに嵌合させた後、次に説明する管状部材１３を嵌合させることによって、別途の外れ止めがなくてもキー部材１４の孔部１４Ａへの嵌合を維持することができる。キー部材１４を配置することによって、連結される鋼管に引張力が作用する場合にも第１の連結部１１と第２の連結部１２との間の接触を維持し、鋼管の抜けを防止することができる。 Further, in the present embodiment, the key member 14 is arranged across the first connecting portion 11 and the second connecting portion 12. As shown in FIG. 1, the first end face 11E and the second end face 12E are in contact with the key member 14, respectively, in the portion where the key member 14 is arranged, and the first end face 11E and the second end face 12E and the second end face 12E are in contact with each other in other parts. End faces 12E come into contact with each other. The key member 14 is fitted into, for example, a hole 14A formed between the first end surface 11E and the second end surface 12E. The key member 14 and the hole 14A may have tapered shapes corresponding to each other. In this case, by fitting the key member 14 into the hole 14A from the outside and then fitting the tubular member 13 described below, the key member 14 can be fitted into the hole 14A without a separate stopper. The mating can be maintained. By arranging the key member 14, the contact between the first connecting portion 11 and the second connecting portion 12 is maintained even when a tensile force acts on the connected steel pipe, and the steel pipe is prevented from coming off. be able to.

図２に示す管状部材１３は、内径が第１の連結部１１および第２の連結部１２の外径に対応する管状部材である。図３に示されるように、第１の連結部１１および第２の連結部１２の外側に管状部材１３を嵌合させることによって、第１の連結部１１が第２の連結部１２に対して管軸方向に交差する方向に変位するのを防止し、第１の連結部１１と第２の連結部１２との間の接触を維持することができる。本実施形態において、管状部材１３は、管状部材１３の外側からキー部材１４に形成された孔部１４Ｂに挿通されるボルト１３Ａ（またはピン）を用いて固定される。他の例において、管状部材１３は外側から第１の連結部１１または第２の連結部１２に挿通されるボルト（またはピン）を用いて固定されてもよい。また、さらに他の例では、連結部の外側ではなく内側に嵌合する管状部材が設けられてもよい。 The tubular member 13 shown in FIG. 2 is a tubular member whose inner diameter corresponds to the outer diameter of the first connecting portion 11 and the second connecting portion 12. As shown in FIG. 3, by fitting the tubular member 13 to the outside of the first connecting portion 11 and the second connecting portion 12, the first connecting portion 11 is attached to the second connecting portion 12. It is possible to prevent displacement in the direction intersecting the pipe axis direction and maintain contact between the first connecting portion 11 and the second connecting portion 12. In the present embodiment, the tubular member 13 is fixed by using a bolt 13A (or a pin) inserted into a hole 14B formed in the key member 14 from the outside of the tubular member 13. In another example, the tubular member 13 may be fixed with a bolt (or pin) inserted into the first connecting portion 11 or the second connecting portion 12 from the outside. Further, in still another example, a tubular member that fits inside the connecting portion instead of outside may be provided.

図４は、図１にIVで示した連結部の周方向の展開図である。図示された例において、第１の端面１１Ｅは、少なくとも部分的に管軸方向に対して非垂直である。通常、円筒状の部材の端面は管軸方向に対して垂直であるが、例えば円筒状の部材を管軸方向について斜めに切断したり、図示された例のように凹凸をつけて切断したりすると、端面の一部または全部は管軸方向に対して非垂直になる。より具体的には、第１の端面１１Ｅは、管軸方向に対して垂直な底部１１Ｅ１および頂部１１Ｅ２と、管軸方向に対して非垂直な（平行な）１対の立ち上がり部１１Ｅ３とを含む凹凸形状を有する。 FIG. 4 is a development view of the connecting portion shown by IV in FIG. 1 in the circumferential direction. In the illustrated example, the first end face 11E is at least partially non-perpendicular to the tube axis direction. Normally, the end face of the cylindrical member is perpendicular to the pipe axis direction, but for example, the cylindrical member may be cut diagonally in the tube axis direction, or may be cut with irregularities as shown in the illustrated example. Then, a part or all of the end face becomes non-perpendicular with respect to the pipe axis direction. More specifically, the first end face 11E includes a bottom portion 11E1 and a top portion 11E2 that are perpendicular to the pipe axis direction, and a pair of rising portions 11E3 that are non-vertical (parallel) to the pipe axis direction. It has an uneven shape.

さらに、図示された例において、第２の端面１２Ｅは、第１の端面１１Ｅに対して相補的な形状を有する。ここで、相補的な形状とは、例えば凸形状および凹形状のように、一方の形状と他方の形状とが互いに補い合う形状である。図示された例では、第２の端面１２Ｅが管軸方向に対して垂直な底部１２Ｅ１および頂部１２Ｅ２と、管軸方向に対して非垂直な（平行な）１対の立ち上がり部１２Ｅ３とを含む凹凸形状を有する。第２の端面１２Ｅの底部１２Ｅ１の長さが第１の端面１１Ｅの頂部１１Ｅ２の長さに対応し、第２の端面１２Ｅの頂部１２Ｅ２の長さが第１の端面１１Ｅの底部１１Ｅ１の長さに対応し、第２の端面１２Ｅの立ち上がり部１２Ｅ３の長さが第１の端面１１Ｅの立ち上がり部１１Ｅ３の長さに対応することによって、第１の端面１１Ｅおよび第２の端面１２Ｅの形状は相補的になっている。 Further, in the illustrated example, the second end face 12E has a shape complementary to the first end face 11E. Here, the complementary shape is a shape in which one shape and the other shape complement each other, such as a convex shape and a concave shape. In the illustrated example, the second end face 12E includes a bottom portion 12E1 and a top portion 12E2 that are perpendicular to the pipe axis direction, and a pair of rising portions 12E3 that are non-vertical (parallel) to the pipe axis direction. Has a shape. The length of the bottom 12E1 of the second end face 12E corresponds to the length of the top 11E2 of the first end face 11E, and the length of the top 12E2 of the second end face 12E is the length of the bottom 11E1 of the first end face 11E. Corresponding to, the length of the rising portion 12E3 of the second end face 12E corresponds to the length of the rising portion 11E3 of the first end face 11E, so that the shapes of the first end face 11E and the second end face 12E are complementary. It has become a target.

上述のように、第１の端面１１Ｅが少なくとも部分的に管軸方向に対して非垂直な形状（立ち上がり部１１Ｅ３）を有し、第２の端面１２Ｅが第１の端面に対して相補的な形状を有することによって、第１の連結部１１と第２の連結部１２との間で管軸回りの回転トルクを伝達することができる。図４に示されるように、第１の端面１１Ｅおよび第２の端面１２Ｅの形状が相補的な場合、第１の端面１１Ｅと第２の端面１２Ｅとを全体的に隙間なく（または、小さい隙間で）接触させることができる。なお、図示された例では立ち上がり部１１Ｅ３，１２Ｅ３の部分に孔部１４Ａが形成されるため、この部分では第１の端面１１Ｅと第２の端面１２Ｅとが接触せず、第１の端面１１Ｅおよび第２の端面１２Ｅがそれぞれキー部材１４に接触する。 As described above, the first end face 11E has a shape (rising portion 11E3) that is at least partially non-vertical to the pipe axis direction, and the second end face 12E is complementary to the first end face. By having the shape, the rotational torque around the pipe axis can be transmitted between the first connecting portion 11 and the second connecting portion 12. As shown in FIG. 4, when the shapes of the first end face 11E and the second end face 12E are complementary, there is no gap (or a small gap) between the first end face 11E and the second end face 12E as a whole. Can be contacted. In the illustrated example, since the holes 14A are formed in the rising portions 11E3 and 12E3, the first end face 11E and the second end face 12E do not come into contact with each other in this portion, and the first end face 11E and the first end face 11E The second end faces 12E come into contact with the key member 14, respectively.

図５は、図１に示した連結構造の部材を鋼管から切り出して製造する例を示す斜視図である。図示された例では、連結構造１０を構成する第１の連結部１１、第２の連結部１２およびキー部材１４が、同一の鋼管からの切り出しによって製造されている。この場合、鋼管から第１の端面１１Ｅを切り出した残りが第２の端面１２Ｅになるため、第１の端面１１Ｅおよび第２の端面１２Ｅを容易かつ確実に相補的な形状にすることができる。また、キー部材１４についても、容易かつ確実に孔部１４Ａに嵌合するサイズで形成することができる。 FIG. 5 is a perspective view showing an example in which a member having a connecting structure shown in FIG. 1 is cut out from a steel pipe and manufactured. In the illustrated example, the first connecting portion 11, the second connecting portion 12, and the key member 14 constituting the connecting structure 10 are manufactured by cutting out from the same steel pipe. In this case, since the rest of the first end face 11E cut out from the steel pipe becomes the second end face 12E, the first end face 11E and the second end face 12E can be easily and surely made into complementary shapes. Further, the key member 14 can also be easily and surely formed in a size that fits into the hole 14A.

連結構造１０が比較的小径（例えば、外径φ５０ｍｍ〜φ２００ｍｍ程度）の鋼管を連結する場合、例えばレーザー加工機を用いて鋼管から第１の連結部１１および第２の連結部１２を切り出すことができる。レーザーを鋼管の中心に向けてキー部材１４を切り出すことによって、キー部材１４と切り出した残りの孔部１４Ａとをテーパー形状にすることができる。上述のように、キー部材１４および孔部１４Ａがテーパー形状であることで、第１の連結部１１および第２の連結部１２の外側に管状部材１３を嵌合させた後は別途の外れ止めがなくてもキー部材１４の孔部１４Ａへの嵌合を維持することができる。 When the connecting structure 10 connects steel pipes having a relatively small diameter (for example, outer diameter of about φ50 mm to φ200 mm), for example, a laser processing machine may be used to cut out the first connecting portion 11 and the second connecting portion 12 from the steel pipe. it can. By cutting out the key member 14 with the laser directed toward the center of the steel pipe, the key member 14 and the remaining cut out hole portion 14A can be tapered. As described above, since the key member 14 and the hole portion 14A have a tapered shape, a separate stopper is provided after the tubular member 13 is fitted to the outside of the first connecting portion 11 and the second connecting portion 12. It is possible to maintain the fitting of the key member 14 into the hole 14A even if there is no key member 14.

（第２の実施形態）
図６は、本発明の第２の実施形態に係る鋼管の連結構造を示す展開図である。本実施形態に係る連結構造では、図６の展開図（図４と同様）に示される第１の連結部２１および第２の連結部２２の第１の端面２１Ｅおよび第２の端面２２Ｅの形状が第１の実施形態と異なり、また連結構造がキー部材を含まない。それ以外の構成については、第１の実施形態と同様であるため重複した説明は省略する。 (Second embodiment)
FIG. 6 is a developed view showing a connected structure of steel pipes according to a second embodiment of the present invention. In the connection structure according to the present embodiment, the shapes of the first end surface 21E and the second end surface 22E of the first connection portion 21 and the second connection portion 22 shown in the developed view of FIG. 6 (similar to FIG. 4). Is different from the first embodiment, and the connecting structure does not include a key member. Since the other configurations are the same as those in the first embodiment, duplicated description will be omitted.

図示された例において、第１の端面２１Ｅは、管軸方向に対して垂直な底部２１Ｅ１および頂部２１Ｅ２と、第１の連結部２１の周方向についてＳ字状に折り返された１対の折り返し部２１Ｅ３を含む。折り返し部２１Ｅ３は、管軸方向に対して非垂直な部分を含む。第２の端面２２Ｅは、管軸方向に対して垂直な底部２２Ｅ１および頂部２２Ｅ２と、第２の連結部２２の周方向についてＳ字状に折り返された１対の折り返し部２２Ｅ３を含む。折り返し部２２Ｅ３は、管軸方向に対して非垂直な部分を含む。第１の端面２１Ｅおよび第２の端面２２Ｅは相補的な形状を有するため、第１の端面２１Ｅの底部２１Ｅ１と第２の端面２２Ｅの頂部２２Ｅ２とがそれぞれ対応する長さで互いに接触し、第１の端面２１Ｅの頂部２１Ｅ２と第２の端面２２Ｅの底部２２Ｅ１とがそれぞれ互いに対応する長さで互いに接触し、折り返し部２１Ｅ３と折り返し部２２Ｅ３とは互いに係合する。 In the illustrated example, the first end face 21E has a bottom portion 21E1 and a top portion 21E2 perpendicular to the pipe axis direction, and a pair of folded portions folded back in an S shape in the circumferential direction of the first connecting portion 21. Includes 21E3. The folded-back portion 21E3 includes a portion that is not perpendicular to the pipe axis direction. The second end face 22E includes a bottom portion 22E1 and a top portion 22E2 that are perpendicular to the pipe axis direction, and a pair of folded portions 22E3 that are folded back in an S shape in the circumferential direction of the second connecting portion 22. The folded-back portion 22E3 includes a portion that is not perpendicular to the pipe axis direction. Since the first end face 21E and the second end face 22E have complementary shapes, the bottom portion 21E1 of the first end face 21E and the top portion 22E2 of the second end face 22E come into contact with each other at corresponding lengths, and the first end face 21E and the second end face 22E have a complementary shape. The top portion 21E2 of the end surface 21E of 1 and the bottom portion 22E1 of the second end surface 22E are in contact with each other with corresponding lengths, and the folded portion 21E3 and the folded portion 22E3 are engaged with each other.

本実施形態でも、第１の端面２１Ｅが少なくとも部分的に管軸方向に対して非垂直な形状（折り返し部２１Ｅ３）を有し、第２の端面２２Ｅが第１の端面に対して相補的な形状を有することによって、第１の連結部２１と第２の連結部２２との間で管軸回りの回転トルクが伝達される。また、本実施形態では、第１の連結部２１および第２の連結部２２の周方向についてＳ字状に折り返された折り返し部２１Ｅ３，２２Ｅ３が互いに係合するため、キー部材を配置しなくても、連結される鋼管に引張力が作用する場合に第１の連結部２１と第２の連結部２２との間の接触を維持し、鋼管の抜けを防止することができる。本実施形態において、第１の連結部２１および第２の連結部２２の外側に嵌合する管状部材（図示せず）を固定するためのボルトまたはピンは、第１の連結部２１に形成された孔部２１Ａおよび第２の連結部２２に形成された孔部２２Ａにそれぞれ挿通される。 Also in this embodiment, the first end face 21E has a shape (folded portion 21E3) that is at least partially non-vertical to the pipe axis direction, and the second end face 22E is complementary to the first end face. By having the shape, the rotational torque around the pipe axis is transmitted between the first connecting portion 21 and the second connecting portion 22. Further, in the present embodiment, since the folded-back portions 21E3 and 22E3 folded back in an S shape in the circumferential direction of the first connecting portion 21 and the second connecting portion 22 engage with each other, the key member is not arranged. Also, when a tensile force acts on the connected steel pipe, the contact between the first connecting portion 21 and the second connecting portion 22 can be maintained, and the steel pipe can be prevented from coming off. In the present embodiment, bolts or pins for fixing a tubular member (not shown) fitted to the outside of the first connecting portion 21 and the second connecting portion 22 are formed in the first connecting portion 21. It is inserted into the hole portion 21A and the hole portion 22A formed in the second connecting portion 22, respectively.

（第３の実施形態）
図７は、本発明の第３の実施形態に係る鋼管の連結構造を示す展開図である。本実施形態に係る連結構造では、図７の展開図（図４と同様）に示される第１の連結部３１および第２の連結部３２の第１の端面３１Ｅおよび第２の端面３２Ｅの形状が第１の実施形態と異なる。それ以外の構成については、第１の実施形態と同様であるため重複した説明は省略する。 (Third Embodiment)
FIG. 7 is a developed view showing a connected structure of steel pipes according to a third embodiment of the present invention. In the connection structure according to the present embodiment, the shapes of the first end surface 31E and the second end surface 32E of the first connection portion 31 and the second connection portion 32 shown in the developed view of FIG. 7 (similar to FIG. 4). Is different from the first embodiment. Since the other configurations are the same as those in the first embodiment, duplicated description will be omitted.

図示された例において、第１の端面３１Ｅは、底部３１Ｅ１、頂部３１Ｅ２および立ち上がり部３１Ｅ３からなる３組の凹凸形状を有する。第２の端面３２Ｅは、底部３２Ｅ１、頂部３２Ｅ２および立ち上がり部３２Ｅ３からなる３組の凹凸形状を有する。第１の端面３１Ｅの底部３１Ｅ１および第２の端面３２Ｅの頂部３２Ｅ２、第１の端面３１Ｅの頂部３１Ｅ２および第２の端面３２Ｅの底部３２Ｅ１、ならびに第１の端面３１Ｅおよび第２の端面３２Ｅの立ち上がり部３１Ｅ３，３２Ｅ３がそれぞれ対応する長さを有することによって、第１の端面３１Ｅおよび第２の端面３２Ｅの形状は相補的になっている。 In the illustrated example, the first end face 31E has three sets of concave-convex shapes including a bottom portion 31E1, a top portion 31E2, and a rising portion 31E3. The second end face 32E has three sets of uneven shapes including a bottom portion 32E1, a top portion 32E2, and a rising portion 32E3. The bottom 31E1 of the first end face 31E and the top 32E2 of the second end face 32E, the top 31E2 of the first end face 31E and the bottom 32E1 of the second end face 32E, and the rise of the first end face 31E and the second end face 32E. The shapes of the first end face 31E and the second end face 32E are complementary because the portions 31E3 and 32E3 have corresponding lengths, respectively.

本実施形態でも、第１の端面３１Ｅが少なくとも部分的に管軸方向に対して非垂直な形状（折り返し部２１Ｅ３）を有し、第２の端面２２Ｅが第１の端面に対して相補的な形状を有することによって、第１の連結部２１と第２の連結部２２との間で管軸回りの回転トルクが伝達される。 Also in this embodiment, the first end face 31E has a shape (folded portion 21E3) that is at least partially non-vertical to the pipe axis direction, and the second end face 22E is complementary to the first end face. By having the shape, the rotational torque around the pipe axis is transmitted between the first connecting portion 21 and the second connecting portion 22.

（施工方法の例）
図８は、本発明の実施形態に係る連結構造を用いた施工方法の例を示す図である。図８では、（ａ）および（ｂ）が比較対象として従来の差し込み式の連結構造９０の施工方法を示し、（ｃ）および（ｄ）が本発明の実施形態に係る連結構造４０の施工方法を示す。それぞれの連結構造は、鋼管を管軸方向（ｘ方向として図示する）に連結する。連結構造４０では、上記で第１の実施形態および第２の実施形態として例示したように、第１の連結部および第２の連結部の第１の端面および第２の端面が管軸方向に直交する少なくとも１つの方向について互いに干渉しない形状を有する。 (Example of construction method)
FIG. 8 is a diagram showing an example of a construction method using the connecting structure according to the embodiment of the present invention. In FIG. 8, (a) and (b) show the construction method of the conventional plug-in type connection structure 90 for comparison, and (c) and (d) show the construction method of the connection structure 40 according to the embodiment of the present invention. Is shown. Each connecting structure connects the steel pipe in the pipe axial direction (shown as the x direction). In the connecting structure 40, as illustrated above as the first embodiment and the second embodiment, the first end face and the second end face of the first connecting portion and the second connecting portion are in the pipe axis direction. It has a shape that does not interfere with each other in at least one orthogonal direction.

図８の（ａ）および（ｂ）に示されるように、従来の連結構造９０の場合、差し込み部９１の長さの分だけ、鋼管を管軸方向に引き上げる必要がある。従って、例えば鋼管を杭として打設する場合であって、上空の高さ制限がある場合は、鋼管の長さが連結時の引き上げ分を除いた長さに制約される。鋼管の長さが１ｍで、差し込み部９１の長さが０．２ｍである場合、高さ制限が１．２ｍ以上であれば長さ１ｍの鋼管を連結しながら杭を打設することができるが、例えば高さ制限が１ｍだと、鋼管の長さを０．８ｍに縮めなければならず、同じ長さの杭を打設するために連結する鋼管の数が増えてしまう。 As shown in FIGS. 8A and 8B, in the case of the conventional connecting structure 90, it is necessary to pull up the steel pipe in the pipe axial direction by the length of the insertion portion 91. Therefore, for example, when a steel pipe is driven as a pile and there is a height limit in the sky, the length of the steel pipe is restricted to the length excluding the pull-up portion at the time of connection. When the length of the steel pipe is 1 m and the length of the insertion portion 91 is 0.2 m, if the height limit is 1.2 m or more, the pile can be driven while connecting the steel pipes of 1 m in length. However, for example, if the height limit is 1 m, the length of the steel pipe must be shortened to 0.8 m, and the number of steel pipes to be connected in order to drive a pile of the same length increases.

一方、図８の（ｃ）および（ｄ）に示されるように、本発明の実施形態に係る連結構造４０の場合、第１の連結部４１を、管軸方向に直交する方向（杭の打設の場合、水平方向）で第２の連結部４２に向けて移動させることによって、第１の連結部４１と第２の連結部４２とを嵌合させることができる。従って、例えば鋼管を杭として打設する場合に上空の高さ制限があっても、鋼管を高さ制限に応じた長さまで延ばすことができる。例えば、高さ制限が１ｍの場合は、鋼管の長さを上記の従来の例（０．８ｍ）よりも長い１ｍにすることができ、同じ長さの杭を打設するために連結する鋼管の数が少なくてよくなる。 On the other hand, as shown in FIGS. 8C and 8D, in the case of the connecting structure 40 according to the embodiment of the present invention, the first connecting portion 41 is oriented in a direction orthogonal to the pipe axis direction (pile driving). In the case of installation, the first connecting portion 41 and the second connecting portion 42 can be fitted by moving the first connecting portion 41 toward the second connecting portion 42 in the horizontal direction). Therefore, for example, when the steel pipe is driven as a pile, even if there is a height limit in the sky, the steel pipe can be extended to a length corresponding to the height limit. For example, when the height limit is 1 m, the length of the steel pipe can be set to 1 m, which is longer than the conventional example (0.8 m) above, and the steel pipes connected to drive piles of the same length are connected. The number of is small and it is good.

図９は、本発明の実施形態に係る連結構造を用いた先端羽根付き回転杭の施工方法の例を示す図である。図示された例では、まず、（ａ）に示すように、素管１および羽根付き先端部２を用意する。次に、（ｂ）に示すように、素管１を切断して第１の鋼管３Ａ、第２の鋼管３Ｂおよび第３の鋼管３Ｃを形成する。このとき、第１の鋼管３Ａと第２の鋼管３Ｂとの間の切断部、および第２の鋼管３Ｂと第３の鋼管３Ｃとの間の切断部では、上記で図５に示した例のように、切り出しによって連結構造１０の第１の連結部１１および第２の連結部１２が形成される。つまり、図示された例では、第１の連結部１１および第２の連結部１２が、連結構造１０によって連結される第１の鋼管３Ａおよび第２の鋼管３Ｂ（ならびに第３の鋼管３Ｃ）の一部であり、それぞれの鋼管の端部に形成される。 FIG. 9 is a diagram showing an example of a method of constructing a rotary pile with tip blades using the connecting structure according to the embodiment of the present invention. In the illustrated example, first, as shown in (a), a raw tube 1 and a bladed tip portion 2 are prepared. Next, as shown in (b), the raw pipe 1 is cut to form the first steel pipe 3A, the second steel pipe 3B, and the third steel pipe 3C. At this time, in the cut portion between the first steel pipe 3A and the second steel pipe 3B and the cut portion between the second steel pipe 3B and the third steel pipe 3C, the example shown in FIG. 5 above is used. As described above, the first connecting portion 11 and the second connecting portion 12 of the connecting structure 10 are formed by cutting out. That is, in the illustrated example, the first connecting portion 11 and the second connecting portion 12 are connected by the connecting structure 10 of the first steel pipe 3A and the second steel pipe 3B (and the third steel pipe 3C). It is a part and is formed at the end of each steel pipe.

次に、（ｃ）に示すように、回転金具４と、上記の第１の実施形態で説明した管状部材１３およびボルト１３Ａとを用意する。さらに、（ｄ）に示すように、第３の鋼管３Ｃに羽根付き先端部２を取り付け、第３の鋼管３Ｃに第２の鋼管３Ｂを連結し、第２の鋼管３Ｂに第１の鋼管３Ａを連結し、第１の鋼管３Ａに回転金具４を取り付ける。鋼管の連結部の外側には管状部材１３が嵌合し、ボルト１３Ａで固定される。このようにして構成された杭は、回転金具４に施工重機から回転トルクを伝達することによって、地中に回転貫入させることができる。 Next, as shown in (c), the rotating metal fitting 4 and the tubular member 13 and the bolt 13A described in the first embodiment are prepared. Further, as shown in (d), the tip portion 2 with blades is attached to the third steel pipe 3C, the second steel pipe 3B is connected to the third steel pipe 3C, and the first steel pipe 3A is connected to the second steel pipe 3B. Is connected, and the rotating metal fitting 4 is attached to the first steel pipe 3A. A tubular member 13 is fitted to the outside of the connecting portion of the steel pipe and fixed with a bolt 13A. The pile configured in this way can be rotationally penetrated into the ground by transmitting a rotational torque to the rotary metal fitting 4 from the construction heavy machine.

以上で説明した本発明の実施形態では、第１の連結部および第２の連結部の端面の嵌合、および連結部の内側または外側に嵌合する管状部材によって連結構造が構成されるため、連結構造の中で溶接が必要とされる部分が少なく（または溶接が必要とされず）、連結構造の施工が容易である。また、上記で図５を参照して説明した例のように同じ鋼管から切り出して連結構造の各部材を製造することが可能であり、この場合はロス部材が少なく経済的である。また、第１の連結部および第２の連結部が連結構造によって連結される鋼管とは別の部材である場合、第１の連結部と第２の連結部とを同じ形状を有する部材にできるため、例えば連結のための部材を雄型雌型などの種類別に管理する必要がなく、簡便である。また、連結される鋼管の管厚が比較的大きい場合には、図９に示した例のように鋼管自体の端部に第１の連結部および第２の連結部を形成することができ、部品数の低減によって施工を簡便にすることができる。 In the embodiment of the present invention described above, the connecting structure is formed by the fitting of the end faces of the first connecting portion and the second connecting portion, and the tubular member fitted inside or outside the connecting portion. There are few parts of the connecting structure that require welding (or welding is not required), and the construction of the connecting structure is easy. Further, it is possible to manufacture each member of the connected structure by cutting out from the same steel pipe as in the example described with reference to FIG. 5, and in this case, there are few loss members and it is economical. Further, when the first connecting portion and the second connecting portion are members different from the steel pipe connected by the connecting structure, the first connecting portion and the second connecting portion can be members having the same shape. Therefore, for example, it is not necessary to manage the members for connection according to the type such as male type and female type, which is convenient. Further, when the pipe thickness of the steel pipe to be connected is relatively large, the first connecting portion and the second connecting portion can be formed at the end of the steel pipe itself as in the example shown in FIG. Construction can be simplified by reducing the number of parts.

以上、添付図面を参照しながら本発明の好適な実施形態について詳細に説明したが、本発明はかかる例に限定されない。本発明の属する技術の分野における通常の知識を有する者であれば、特許請求の範囲に記載された技術的思想の範疇内において、各種の変更例または修正例に想到し得ることは明らかであり、これらについても、当然に本発明の技術的範囲に属するものと了解される。 Although the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to such examples. It is clear that a person having ordinary knowledge in the field of technology to which the present invention belongs can come up with various modifications or modifications within the scope of the technical idea described in the claims. , These are also naturally understood to belong to the technical scope of the present invention.

１０…連結構造、１１，２１，３１…第１の連結部、１１Ｅ，２１Ｅ，３１Ｅ…第１の端面、１２，２２，３２…第２の連結部、１２Ｅ，２２Ｅ，３２Ｅ…第２の端面、１３…管状部材、１３Ａ…ボルト、１４…キー部材、１…素管、２…羽根付き先端部、３Ａ…第１の鋼管、３Ｂ…第２の鋼管、３Ｃ…第３の鋼管、４…回転金具。 10 ... Connecting structure 11,21,31 ... First connecting portion, 11E, 21E, 31E ... First end face, 12, 22, 32 ... Second connecting portion, 12E, 22E, 32E ... Second end face , 13 ... Tubular member, 13A ... Bolt, 14 ... Key member, 1 ... Elementary pipe, 2 ... Blade tip, 3A ... First steel pipe, 3B ... Second steel pipe, 3C ... Third steel pipe, 4 ... Rotating metal fittings.

Claims

第１の鋼管と第２の鋼管とを管軸方向に連結する鋼管の連結構造であって、
前記管軸方向を軸とする円筒状に形成され、少なくとも部分的に前記管軸方向に対して非垂直な第１の端面を有する第１の連結部と、
前記管軸方向を軸とする円筒状に形成され、前記第１の端面に接触し前記第１の端面に対して相補的な形状の第２の端面を有する第２の連結部と、
前記第１の連結部および前記第２の連結部の内側または外側に嵌合する管状部材と
を備える鋼管の連結構造。 It is a connecting structure of steel pipes that connects the first steel pipe and the second steel pipe in the pipe axis direction.
A first connecting portion formed in a cylindrical shape with the pipe axis direction as an axis and having a first end face which is at least partially perpendicular to the pipe axis direction.
A second connecting portion which is formed in a cylindrical shape about the pipe axis direction and has a second end face which is in contact with the first end face and has a shape complementary to the first end face.
A connecting structure of a steel pipe including a first connecting portion and a tubular member fitted inside or outside the second connecting portion.

前記第１の連結部および前記第２の連結部にまたがって配置されるキー部材をさらに備え、
前記キー部材が配置される部分では前記第１の端面および前記第２の端面がそれぞれ前記キー部材に接触し、それ以外の部分では前記第１の端面および前記第２の端面が互いに接触する、請求項１に記載の鋼管の連結構造。 Further comprising a key member arranged across the first connecting portion and the second connecting portion.
In the portion where the key member is arranged, the first end face and the second end face are in contact with the key member, respectively, and in other parts, the first end face and the second end face are in contact with each other. The steel pipe connecting structure according to claim 1.

前記管状部材は、前記第１の連結部および前記第２の連結部の外側に嵌合し、前記管状部材の外側から前記キー部材に挿通されるボルトまたはピンを用いて固定される、請求項２に記載の鋼管の連結構造。 Claim that the tubular member is fitted to the outside of the first connecting portion and the second connecting portion, and is fixed by using a bolt or a pin inserted into the key member from the outside of the tubular member. 2. The steel pipe connecting structure according to 2.

前記管状部材は、前記第１の連結部および前記第２の連結部の外側に嵌合し、前記管状部材の外側から前記第１の連結部または前記第２の連結部に挿通されるボルトまたはピンを用いて固定される、請求項１から請求項３のいずれか１項に記載の鋼管の連結構造。 The tubular member is fitted to the outside of the first connecting portion and the second connecting portion, and is inserted into the first connecting portion or the second connecting portion from the outside of the tubular member. The connecting structure of a steel pipe according to any one of claims 1 to 3, which is fixed by using a pin.

前記第１の端面および前記第２の端面は、前記管軸方向に直交する少なくとも１つの方向について互いに干渉しない形状を有する、請求項１から請求項４のいずれか１項に記載の鋼管の連結構造。 The connection of steel pipes according to any one of claims 1 to 4, wherein the first end face and the second end face have a shape that does not interfere with each other in at least one direction orthogonal to the pipe axis direction. Construction.

前記第１の連結部および前記第２の連結部の少なくともいずれかは、前記第１の鋼管および前記第２の鋼管とは別の部材であり、前記第１の鋼管または前記第２の鋼管に接合される、請求項１から請求項５のいずれか１項に記載の鋼管の連結構造。 At least one of the first connecting portion and the second connecting portion is a member different from the first steel pipe and the second steel pipe, and is attached to the first steel pipe or the second steel pipe. The connecting structure of steel pipes according to any one of claims 1 to 5, which is joined.

前記第１の連結部および前記第２の連結部は、前記第１の鋼管および前記第２の鋼管とは別の部材であり、互いに同じ形状を有する、請求項６に記載の鋼管の連結構造。 The connecting structure of the steel pipe according to claim 6, wherein the first connecting portion and the second connecting portion are members different from the first steel pipe and the second steel pipe and have the same shape as each other. ..

前記第１の連結部および前記第２の連結部の少なくともいずれかは、前記第１の鋼管または前記第２の鋼管の一部であり、前記第１の鋼管または前記第２の鋼管の端部に形成される、請求項１から請求項６のいずれか１項に記載の鋼管の連結構造。 At least one of the first connecting portion and the second connecting portion is a part of the first steel pipe or the second steel pipe, and the end portion of the first steel pipe or the second steel pipe. The steel pipe connecting structure according to any one of claims 1 to 6, which is formed in 1.

前記第１の鋼管および前記第２の鋼管は、先端羽根付き回転杭を構成する、請求項１から請求項８のいずれか１項に記載の鋼管の連結構造。 The connecting structure of the steel pipe according to any one of claims 1 to 8, wherein the first steel pipe and the second steel pipe constitute a rotary pile with tip blades.

請求項１から請求項９のいずれか１項に記載の鋼管の連結構造を用いた先端羽根付き回転杭。 A rotary pile with tip blades using the steel pipe connecting structure according to any one of claims 1 to 9.

第１の鋼管と第２の鋼管とを管軸方向に連結する鋼管の連結方法であって、
前記第１の鋼管と同軸の円筒状に形成され、前記第１の鋼管とは反対側に位置する第１の端面が少なくとも部分的に前記管軸方向に対して非垂直な形状を有する第１の連結部と、前記第２の鋼管と同軸の円筒状に形成され、前記第２の鋼管とは反対側に位置する第２の端面が前記第１の端面に対して相補的な形状を有する第２の連結部とを、前記第１の端面と前記第２の端面とが互いに接触するように嵌合させる工程と、
前記第１の連結部および前記第２の連結部の内側または外側に管状部材を嵌合させる工程と
を含む鋼管の連結方法。 It is a method of connecting a steel pipe that connects a first steel pipe and a second steel pipe in the pipe axis direction.
A first steel pipe formed in a cylindrical shape coaxial with the first steel pipe, and having a first end face located on the opposite side of the first steel pipe at least partially perpendicular to the pipe axis direction. The second end face, which is formed in a cylindrical shape coaxial with the second steel pipe and is located on the opposite side of the second steel pipe, has a shape complementary to the first end face. A step of fitting the second connecting portion so that the first end face and the second end face are in contact with each other.
A method for connecting a steel pipe, which comprises a step of fitting a tubular member inside or outside the first connecting portion and the second connecting portion.

前記第１の端面および前記第２の端面は、前記管軸方向に直交する少なくとも１つの方向について互いに干渉しない形状を有し、
前記第１の連結部を、前記少なくとも１つの方向で前記第２の連結部に向けて移動させることによって、前記第１の連結部と前記第２の連結部とを嵌合させる、請求項１１に記載の鋼管の連結方法。 The first end face and the second end face have a shape that does not interfere with each other in at least one direction orthogonal to the pipe axis direction.
11. A claim that fits the first connecting portion and the second connecting portion by moving the first connecting portion toward the second connecting portion in at least one direction. The method for connecting steel pipes according to.

前記第１の連結部と前記第２の連結部とを嵌合させる工程と、前記管状部材を嵌合させる工程との間に、前記第１の端面と前記第２の端面との間に部分的に形成された隙間にキー部材を嵌合させる工程をさらに含む、請求項１１または請求項１２に記載の鋼管の連結方法。 A portion between the first end face and the second end face between the step of fitting the first connecting portion and the second connecting portion and the step of fitting the tubular member. The method for connecting steel pipes according to claim 11 or 12, further comprising a step of fitting the key member into the gap formed above the surface.