JP5836865B2

JP5836865B2 - Joint structure between steel pipe pile and pile head, and concrete foundation construction method using this joint structure

Info

Publication number: JP5836865B2
Application number: JP2012081154A
Authority: JP
Inventors: 相和　明男; 明男相和; 宏英杉原; 正誌金森
Original assignee: Kubota Corp
Current assignee: Kubota Corp
Priority date: 2012-03-30
Filing date: 2012-03-30
Publication date: 2015-12-24
Anticipated expiration: 2032-03-30
Also published as: JP2013209857A

Description

コンクリート基礎に適用される鋼管杭と杭頭との継手構造であって、前記杭頭は、一方の端部に前記コンクリート基礎の定着鉄筋と接続されるとともに当該コンクリート基礎に埋設される杭頭側定着鉄筋を備え、他方の端部が継手部を介して前記鋼管杭の先端に、長手方向に互いに抜き差し不能に接続された鋼管杭と杭頭との継手構造、及び、この継手構造を用いたコンクリート基礎の施工方法に関する。 It is a joint structure of a steel pipe pile and a pile head applied to a concrete foundation, and the pile head is connected to a fixed reinforcing bar of the concrete foundation at one end and is buried in the concrete foundation. A joint structure of a steel pipe pile and a pile head which is provided with a fixing reinforcing bar and whose other end is connected to the tip of the steel pipe pile via a joint portion in a longitudinal direction so that it cannot be inserted and removed from each other, and this joint structure was used. The present invention relates to a concrete foundation construction method.

従来、鋼管杭と杭頭とは、現地において溶接により接合されていた。しかしながら、現地において溶接をする場合、工数が増加することから、作業時間が増大するという問題があった。
また、特許文献１には、既設杭とフーチング結合材との連結構造として、以下のものが開示されている。即ち、杭頭部１Ａの外周面に第１せん断キー４を設けた既製杭１と、前記杭頭部１Ａに嵌合可能な鋼製リング６の内周面に前記第１せん断キー４と対応する第２せん断キー８を、外周面にフーチングに埋め込まれる鉄筋７をそれぞれ備えたフーチング結合材５から構成され、前記フーチング結合材５の前記鋼製リング６を、前記第１せん断キー４と第２せん断キー８との係合による連結で前記既成杭１の杭頭部１Ａに固定する連結構造が開示されている。 Conventionally, the steel pipe pile and the pile head were joined by welding on site. However, when welding is performed on site, the number of man-hours increases, so there is a problem that the working time increases.
Patent Document 1 discloses the following as a connection structure between an existing pile and a footing binder. That is, the ready-made pile 1 provided with the first shear key 4 on the outer peripheral surface of the pile head 1A, and the first shear key 4 on the inner peripheral surface of the steel ring 6 that can be fitted to the pile head 1A. The second shearing key 8 is composed of a footing joint material 5 each having a reinforcing bar 7 embedded in a footing on the outer peripheral surface, and the steel ring 6 of the footing joint material 5 is connected to the first shear key 4 and the second shear key 8. The connection structure fixed to the pile head 1A of the said existing pile 1 by the connection by engagement with the 2 shear key 8 is disclosed.

特開２０１０−１４４３９２号公報（要約及び図１を参照）JP 2010-144392 A (see summary and FIG. 1)

上記の連結構造においては、設定された接続強度を発揮するように杭頭部１Ａと鋼製リング６とを接続するためには、第１せん断キー４と第２せん断キー８とを位置ずれなく対向させて係合する必要があり、杭頭部１Ａと鋼製リング６との相対回動位置を自由に設定することができない。このため、例えば、複数の鋼管杭を並設して、各杭頭の鉄筋７に亘ってコンクリート基礎の定着鉄筋を設ける場合、接続強度を維持した状態で鉄筋７の位置が適切になるように、杭頭部１Ａと鋼製リング６との相対回動位置を自由に変更できないという問題がある。
本発明は、上記の問題に鑑みてなされたものであり、鋼管杭と杭頭とを容易に連結することができ、且つ、杭頭側定着鉄筋を適切な位置に配設可能な継手構造、及び、この継手構造を用いたコンクリート基礎の施工方法を提供することを目的とする。 In the above connecting structure, in order to connect the pile head 1A and the steel ring 6 so as to exhibit the set connection strength, the first shear key 4 and the second shear key 8 are not misaligned. It is necessary to engage with each other so that the relative rotation position between the pile head 1A and the steel ring 6 cannot be freely set. For this reason, for example, when arranging a plurality of steel pipe piles in parallel and providing a fixed reinforcement for a concrete foundation over the reinforcing bars 7 at the heads of the piles, the position of the reinforcing bars 7 is appropriate in a state in which the connection strength is maintained. There is a problem that the relative rotation position between the pile head 1A and the steel ring 6 cannot be freely changed.
The present invention has been made in view of the above problems, and can easily connect a steel pipe pile and a pile head, and a joint structure in which a pile head side fixing reinforcing bar can be disposed at an appropriate position, And it aims at providing the construction method of the concrete foundation using this joint structure.

本発明による鋼管杭と杭頭との継手構造は、コンクリート基礎に適用される鋼管杭と杭頭との継手構造であって、前記杭頭は、一体に構成され、その一方の端部に前記コンクリート基礎の定着鉄筋と接続されるとともに当該コンクリート基礎に埋設される杭頭側定着鉄筋を備え、他方の端部が継手部を介して前記鋼管杭の先端に、長手方向に相対移動を不能に接続され、前記コンクリート基礎の定着鉄筋の配設位置との関係で決定される配設位置に前記杭頭側定着鉄筋を配設するべく、前記継手部が、前記鋼管杭と前記杭頭との接続を維持した状態で、前記鋼管杭に対する前記杭頭の相対回動を許容するように構成されている。 The joint structure of a steel pipe pile and a pile head according to the present invention is a joint structure of a steel pipe pile and a pile head applied to a concrete foundation, and the pile head is configured integrally , and the above-described pile head is formed at one end thereof. It is connected to the fixed reinforcing bar of the concrete foundation and has a fixed reinforcing bar on the pile head side embedded in the concrete foundation, and the other end cannot be relatively moved in the longitudinal direction at the tip of the steel pipe pile through the joint. connected, to disposing the pile cranial fixing rebars in disposed position determined in relation to the arrangement position of the fixing reinforcement of the concrete foundation, the joint portion, and the pile head and the steel pipe pile In this state, the relative rotation of the pile head with respect to the steel pipe pile is allowed.

上記構成によれば、現場において杭頭と鋼管杭とを溶接により接合する必要が無く、杭頭と鋼管杭とを簡単に連結することができる。また、継手部が、鋼管杭と杭頭との接続を維持した状態で、鋼管杭に対する杭頭の相対回動を許容するように構成されている。つまり、継手部が、鋼管杭と杭頭との接続強度を設定強度に維持した状態で鋼管杭に対する杭頭の相対回動を許容する。このため、鋼管杭と杭頭との接続強度を低下させること無く、鋼管杭に対して杭頭を相対回動させて、杭頭側定着鉄筋を、コンクリート基礎の定着鉄筋の配設位置との関係で決定される適切な配設位置に設けることができる。
従って、鋼管杭と杭頭とを容易に連結することができ、且つ、杭頭側定着鉄筋を適切な位置に配設可能な継手構造を得ることができる。 According to the said structure, it is not necessary to join a pile head and a steel pipe pile by welding in the field, and a pile head and a steel pipe pile can be connected easily. Further, the joint portion is configured to allow relative rotation of the pile head with respect to the steel pipe pile while maintaining the connection between the steel pipe pile and the pile head. That is, the joint portion allows relative rotation of the pile head with respect to the steel pipe pile while maintaining the connection strength between the steel pipe pile and the pile head at the set strength. For this reason, without lowering the connection strength between the steel pipe pile and the pile head, the pile head is relatively rotated with respect to the steel pipe pile, and the pile head side fixed reinforcing bar It can be provided at an appropriate arrangement position determined by the relationship.
Therefore, it is possible to easily connect the steel pipe pile and the pile head and to obtain a joint structure in which the pile head side fixing reinforcing bar can be disposed at an appropriate position.

上記構成において、前記鋼管杭が、隣接する鋼管同士を継手部を介して接続して構成され、前記鋼管同士を接続する継手部が、前記鋼管杭と前記杭頭を接続する継手部と同じ継手部であると好適である。 The said structure WHEREIN: The said steel pipe pile is comprised by connecting adjacent steel pipes via a joint part, and the joint part which connects the said steel pipes is the same joint as the joint part which connects the said steel pipe pile and the said pile head Part.

上記構成によれば、鋼管同士を接続する継手部と、鋼管杭と杭頭とを接続する継手部とが同じ構造を有するので、製造コストを削減することができる。また、鋼管同士を接続する継手部と、鋼管杭と杭頭とを接続する継手部とが同じ構造を有することから、鋼管同士の接続作業及び鋼管杭と杭頭との接続作業が同様の作業とるとともに、同じ治具を用いて作業素行うことができる。この結果、作業工数を低減することができる。 According to the said structure, since the joint part which connects steel pipes and the joint part which connects a steel pipe pile and a pile head have the same structure, manufacturing cost can be reduced. Moreover, since the joint part which connects steel pipes and the joint part which connects a steel pipe pile and a pile head have the same structure, the connection work between steel pipes and the connection work between a steel pipe pile and a pile head are the same work. In addition, it is possible to perform work using the same jig. As a result, the number of work steps can be reduced.

本発明によるコンクリート基礎の施工方法は、上記の継手構造を有する鋼管杭を、鋼管杭を、前記杭頭に設けられた杭頭側定着鉄筋を露出させた状態で地中に複数本並列配置して、並列配置された鋼管杭に亘ってコンクリート基礎を設けるコンクリート基礎の施工方法であって、前記コンクリート基礎の定着鉄筋を配設するに際し、当該定着鉄筋の配設位置との関係で決定される配設位置に、夫々の杭頭に設けられた杭頭側定着鉄筋を配設するべく、前記鋼管杭と当該鋼管杭に接続された杭頭との相対回動位置を位置決めする位置決め工程を実施する。 A concrete foundation construction method according to the present invention includes a plurality of steel pipe piles arranged in parallel in the ground with steel pipe piles having the above joint structure exposed, with the pile head side fixed reinforcing bars provided on the pile heads exposed. A concrete foundation construction method in which a concrete foundation is provided across steel pipe piles arranged in parallel, and when the fixing reinforcing bars of the concrete foundation are arranged, it is determined in relation to the arrangement position of the fixing reinforcing bars. In order to arrange the pile head side fixed reinforcing bar provided at each pile head at the arrangement position, a positioning step is performed to position the relative rotation position of the steel pipe pile and the pile head connected to the steel pipe pile. To do.

上記構成によれば、現場において杭頭と鋼管杭とを溶接により接合する必要が無く、杭頭と鋼管杭とを簡単に連結することができる。また、鋼管杭と杭頭との接続を維持して鋼管杭と杭頭との接続強度を低下させること無く、鋼管杭に対して杭頭を相対回動させて、杭頭側定着鉄筋を、コンクリート基礎の定着鉄筋の配設位置との関係で決定される適切な配設位置に設けることができる。従って、コンクリート基礎の定着鉄筋を容易に適切な位置に配設することができる。 According to the said structure, it is not necessary to join a pile head and a steel pipe pile by welding in the field, and a pile head and a steel pipe pile can be connected easily. In addition, without lowering the connection strength between the steel pipe pile and the pile head while maintaining the connection between the steel pipe pile and the pile head, the pile head is fixed relative to the steel pipe pile by rotating the pile head relative to the pile head side. It can be provided at an appropriate arrangement position determined in relation to the arrangement position of the fixing reinforcing bars of the concrete foundation. Therefore, the fixing reinforcing bars of the concrete foundation can be easily arranged at appropriate positions.

本願発明の鋼管杭を示す正面図である。It is a front view which shows the steel pipe pile of this invention. 本願発明の鋼管杭を示す上面図である。It is a top view which shows the steel pipe pile of this invention. 杭頭と鋼管杭との継手構造を示す断面図である。It is sectional drawing which shows the joint structure of a pile head and a steel pipe pile. 杭頭と鋼管杭との継手構造を示す斜視図である。It is a perspective view which shows the joint structure of a pile head and a steel pipe pile. 鋼管杭の継手構造を示す断面図である。It is sectional drawing which shows the joint structure of a steel pipe pile. 本発明の別実施形態の継手構造を示す図である。It is a figure which shows the joint structure of another embodiment of this invention.

以下、本発明に係る継手構造を地中に埋設される鋼管杭（杭基礎）に適用した例を図面に基づいて説明する。 Hereinafter, the example which applied the joint structure concerning this invention to the steel pipe pile (pile foundation) embed | buried in the ground is demonstrated based on drawing.

〔杭基礎の概要〕
図１に示すように、鋼管杭１００は、複数の鋼管をほぼ同一の軸芯Ｘ上に位置させて、長手方向に互いに抜き差し不能に接合して構成する。鋼管杭１００の設計長さは、長いものであると数十メートルにも至るため、工場で接合してから施工現場に搬送するというのは不可能であり、通常は施工現場で打設を行いながら順次接合を行う。また、鋼管杭１００の一方の端部（上端）には、鉄筋籠７０を備えた杭頭６が接合される。鋼管杭１００は杭頭６に設けられた鉄筋籠７０が地上に露出した状態となるように設けられ、上記の鋼管杭１００が複数並列して設けられる。 [Outline of pile foundation]
As shown in FIG. 1, the steel pipe pile 100 is configured by positioning a plurality of steel pipes on substantially the same axis X and joining them in the longitudinal direction so that they cannot be inserted and removed. Since the design length of the steel pipe pile 100 reaches several tens of meters if it is long, it is impossible to transport it to the construction site after joining at the factory. Sequential joining is performed. Moreover, the pile head 6 provided with the reinforcing bar rod 70 is joined to one end (upper end) of the steel pipe pile 100. The steel pipe pile 100 is provided so that the reinforcing bar 70 provided on the pile head 6 is exposed to the ground, and a plurality of the steel pipe piles 100 are provided in parallel.

〔鋼管の継手構造〕
鋼管杭１００が何本の鋼管から構成されていようとも、各鋼管同士の接合は全ての箇所において同一である。したがって、図１及び５に示すごとく、上下関係にある特定の上杭２と下杭１とに着目して、鋼管の継手構造を説明する。形式的に上杭２と下杭１とに呼び分けるが、これらは実質的には同じ鋼管である。即ち、上杭２及び下杭１が、本発明に係る「隣接する鋼管」に相当する。下杭１のうち上杭２の側の先端部には、工場において雄形のピン継手１０が溶接により固着されている。上杭２のうち下杭１の側の先端部には、工場においてピン継手１０に外嵌されるボックス継手２０が溶接により固着されている。即ち、ピン継手１０（軸状継手部）及びボックス継手２０（筒状継手部）が鋼管同士を接続する「継手部」に相当する。 [Fitting structure of steel pipe]
No matter how many steel pipes the steel pipe pile 100 is composed of, the joint between the steel pipes is the same at all points. Therefore, as shown in FIGS. 1 and 5, the joint structure of the steel pipe will be described by paying attention to the specific upper pile 2 and the lower pile 1 that are in a vertical relationship. Formally called the upper pile 2 and the lower pile 1, but these are substantially the same steel pipe. That is, the upper pile 2 and the lower pile 1 correspond to “adjacent steel pipes” according to the present invention. A male pin joint 10 is fixed to the tip of the upper pile 2 of the lower pile 1 by welding at the factory. A box joint 20 that is externally fitted to the pin joint 10 in the factory is fixed to the tip of the upper pile 2 on the lower pile 1 side by welding. That is, the pin joint 10 (shaft joint portion) and the box joint 20 (tubular joint portion) correspond to a “joint portion” that connects steel pipes.

ピン継手１０は、図５に示すごとく、下杭１と同様に筒状に形成されている。ピン継手１０は、下杭１に固着される軸側基部１１と、軸側基部１１から延設されると共に外径が軸側基部１１よりも小さい嵌挿部１２と、軸側基部１１と嵌挿部１２との段差部である軸側接合面１３と、軸側接合面１３に周設された軸側凹部１４と、嵌挿部１２の先端部に周設された軸側凸部１５と、を備えている。 As shown in FIG. 5, the pin joint 10 is formed in a cylindrical shape like the lower pile 1. The pin joint 10 includes a shaft base 11 fixed to the lower pile 1, a fitting insertion portion 12 extending from the shaft base 11 and having an outer diameter smaller than that of the shaft base 11, and the shaft base 11 fitted. A shaft side joint surface 13 which is a stepped portion with the insertion portion 12, a shaft side concave portion 14 provided around the shaft side joint surface 13, and a shaft side convex portion 15 provided around the distal end portion of the fitting insertion portion 12. It is equipped with.

軸側基部１１は、下杭１側では、下杭１と同じ内径・外径・肉厚であり、中途部分から、内径を小さくしつつ外径を大きくして肉厚を厚くしてある。嵌挿部１２は、軸側基部１１の内周面を同径のまま延長した内周面と、軸側基部１１の外周面を段差的に縮径した外周面と、を有している。軸側凹部１４は、軸側接合面１３のうち内径側の部分を、軸芯Ｘ方向に沿って下杭１の側に環状に凹入して形成してある。軸側凸部１５は、嵌挿部１２の先端部のうち外径側の部分を、軸芯Ｘ方向に沿って先端側に環状に突出させて形成してある。 The shaft-side base 11 has the same inner diameter, outer diameter, and thickness as the lower pile 1 on the lower pile 1 side, and the outer diameter is increased and the wall thickness is increased while decreasing the inner diameter from the middle portion. The fitting insertion portion 12 has an inner peripheral surface obtained by extending the inner peripheral surface of the shaft-side base 11 with the same diameter, and an outer peripheral surface obtained by reducing the diameter of the outer peripheral surface of the shaft-side base 11 stepwise. The shaft-side recess 14 is formed by recessing an inner diameter side portion of the shaft-side joining surface 13 in an annular shape on the lower pile 1 side along the axis X direction. The shaft-side convex portion 15 is formed by projecting an outer diameter side portion of the distal end portion of the fitting insertion portion 12 in an annular shape toward the distal end side along the axis X direction.

ボックス継手２０は、図５に示すごとく、上杭２と同様に筒状に形成されている。ボックス継手２０は、上杭２に固着される筒側基部２１と、筒側基部２１から延設されると共に内径が筒側基部２１よりも大きく、嵌挿部１２を受け入れる嵌受部２２と、嵌受部２２の先端部に設けられ、軸側接合面１３と接する筒側接合面２３と、筒側接合面２３に周設され、軸側凹部１４と係合する筒側凸部２４と、筒側基部２１と嵌受部２２との段差部に周設され、軸側凸部１５と係合する筒側凹部２５と、を備えている。 As shown in FIG. 5, the box joint 20 is formed in a cylindrical shape like the upper pile 2. The box joint 20 includes a cylinder side base 21 fixed to the upper pile 2, a fitting receiving part 22 that extends from the cylinder side base 21 and has an inner diameter larger than that of the cylinder side base 21, and receives the fitting insertion part 12. A cylinder-side joint surface 23 that is provided at the distal end of the fitting receiving portion 22 and is in contact with the shaft-side joint surface 13; a cylinder-side convex portion 24 that is provided around the cylinder-side joint surface 23 and that engages with the shaft-side recess 14; A cylinder-side concave portion 25 is provided around the step portion between the cylinder-side base portion 21 and the fitting receiving portion 22 and engages with the shaft-side convex portion 15.

筒側基部２１は、上杭２の側では、上杭２と同じ内径・外径・肉厚であり、中途部分から、内径を小さくしつつ外径を大きくして肉厚を厚くしてある。嵌受部２２は、筒側基部２１の内周面を段差的に拡径した内周面と、筒側基部２１の外周面を同径のまま延長した外周面と、を有している。筒側凸部２４は、筒側接合面２３のうち内径側の部分を、軸芯Ｘ方向に沿って先端側に環状に突出させて形成してある。筒側凹部２５は、筒側基部２１と嵌受部２２との段差部のうち外径側の部分を、軸芯Ｘ方向に沿って先端側に環状に凹入して形成してある。 The cylinder-side base 21 has the same inner diameter, outer diameter, and thickness as the upper pile 2 on the side of the upper pile 2, and from the middle part, the outer diameter is increased while increasing the outer diameter while increasing the thickness. . The fitting receiving portion 22 has an inner peripheral surface obtained by expanding the inner peripheral surface of the cylinder side base portion 21 stepwise, and an outer peripheral surface obtained by extending the outer peripheral surface of the tube side base portion 21 with the same diameter. The tube-side convex portion 24 is formed by projecting an inner diameter side portion of the tube-side joint surface 23 in an annular shape toward the tip side along the axial center X direction. The cylinder-side recess 25 is formed by recessing a portion on the outer diameter side of the stepped portion between the cylinder-side base 21 and the fitting receiving portion 22 in an annular shape on the tip side along the axis X direction.

図５に示すごとく、嵌挿部１２の外径と嵌受部２２の内径とはほぼ同一に設定してあり、ピン継手１０をボックス継手２０に挿入すると、嵌挿部１２の外周面と嵌受部２２の内周面とは密接し、軸側接合面１３と筒側接合面２３とも密接する。軸側凹部１４の軸芯Ｘ方向の断面形状は、筒側凸部２４と係合可能なよう設定してある。筒側凹部２５の軸芯Ｘ方向の断面形状は、軸側凸部１５と係合可能なよう設定してある。また、嵌挿部１２の内周面と筒側基部２１の内周面とは面一となるように設定してある。 As shown in FIG. 5, the outer diameter of the insertion portion 12 and the inner diameter of the fitting receiving portion 22 are set to be substantially the same, and when the pin joint 10 is inserted into the box joint 20, it fits with the outer peripheral surface of the insertion portion 12. The inner surface of the receiving portion 22 is in close contact with the shaft side joint surface 13 and the tube side joint surface 23. The cross-sectional shape of the shaft-side recess 14 in the direction of the axis X is set so as to be engageable with the tube-side protrusion 24. The cross-sectional shape of the cylinder side recess 25 in the axis X direction is set so as to be engageable with the axis side protrusion 15. Further, the inner peripheral surface of the insertion portion 12 and the inner peripheral surface of the tube side base portion 21 are set to be flush with each other.

嵌挿部１２の外周部に、軸芯Ｘの周方向に沿って一つの軸側キー溝１６を周設してある。同様に、嵌受部２２の内周部に、ボックス継手２０にピン継手１０を挿入したときに軸側キー溝１６と対応する一つの筒側キー溝２６を周設してある。軸側キー溝１６及び筒側キー溝２６の軸芯Ｘ方向の断面形状は、軸芯Ｘ方向の長さが同じである長方形にしてある。ボックス継手２０にピン継手１０を挿入したとき、軸側キー溝１６と筒側キー溝２６とは対向し、協働して長方形断面の一つの溝を構成する。 One shaft side keyway 16 is provided around the outer peripheral portion of the insertion portion 12 along the circumferential direction of the shaft core X. Similarly, one cylinder side key groove 26 corresponding to the shaft side key groove 16 when the pin joint 10 is inserted into the box joint 20 is provided around the inner periphery of the fitting receiving portion 22. The cross-sectional shape of the shaft side keyway 16 and the cylinder side keyway 26 in the axis X direction is a rectangle having the same length in the axis X direction. When the pin joint 10 is inserted into the box joint 20, the shaft-side key groove 16 and the cylinder-side key groove 26 face each other and cooperate to form one groove having a rectangular cross section.

嵌受部２２のうち筒側キー溝２６が設けられた箇所には、嵌受部２２の外周部から筒側キー溝２６に連通するネジ孔が、周方向に沿って間隔をおいて複数穿孔されている。そして、ネジ孔には、セットボルト３０を螺合させてあり、セットボルト３０はボックス継手２０の外側からの締め込み操作によって、径方向内側に螺進可能である。筒側キー溝２６には、「キー部材」としての荷重伝達キー３１が収容されている。荷重伝達キー３１にはセットボルト３０の先端部が固定されており、セットボルト３０の締め込み操作によって、荷重伝達キー３１は筒側キー溝２６内から径方向内側に突出可能である。 A plurality of screw holes communicating from the outer peripheral portion of the fitting receiving portion 22 to the cylinder side key groove 26 are provided at intervals in the circumferential direction at a portion of the fitting receiving portion 22 where the cylinder side key groove 26 is provided. Has been. A set bolt 30 is screwed into the screw hole, and the set bolt 30 can be screwed inward in the radial direction by a tightening operation from the outside of the box joint 20. The cylinder side keyway 26 accommodates a load transmission key 31 as a “key member”. The tip of the set bolt 30 is fixed to the load transmission key 31, and the load transmission key 31 can project radially inward from the cylinder side key groove 26 by tightening the set bolt 30.

筒側キー溝２６の溝深さは、荷重伝達キー３１の径方向の長さよりも大きくしてあり、かつ、軸側キー溝１６の溝深さは、荷重伝達キー３１の径方向の長さの約１／２程度にしてある。また、荷重伝達キー３１の形状は、筒側キー溝２６に最も引退された状態で筒側キー溝２６にほぼ隙間なく収容される円弧状にしてある。よって、荷重伝達キー３１を筒側キー溝２６に最も引退させると、荷重伝達キー３１が嵌受部２２の内周面から突出しない。即ち、荷重伝達キー３１を筒側キー溝２６に最も引退させておけば、ピン継手１０をボックス継手２０に円滑に挿入できる。また、ピン継手１０をボックス継手２０に挿入したときに、荷重伝達キー３１を筒側キー溝２６から最も突出させると、荷重伝達キー３１は筒側キー溝２６と軸側キー溝１６とにほぼ均等に跨って係止する。これにより、ピン継手１０とボックス継手２０との軸芯Ｘ方向の相対移動が拘束される。 The groove depth of the cylinder side key groove 26 is larger than the length of the load transmission key 31 in the radial direction, and the groove depth of the shaft side key groove 16 is the length of the load transmission key 31 in the radial direction. About 1/2. The shape of the load transmission key 31 is an arc shape that is accommodated in the cylinder-side key groove 26 with almost no gap in the state of being most retracted in the cylinder-side key groove 26. Therefore, when the load transmission key 31 is most retracted into the cylinder side key groove 26, the load transmission key 31 does not protrude from the inner peripheral surface of the fitting receiving portion 22. That is, the pin joint 10 can be smoothly inserted into the box joint 20 by retracting the load transmission key 31 most into the cylinder side key groove 26. Further, when the pin joint 10 is inserted into the box joint 20, when the load transmission key 31 is protruded most from the cylinder side key groove 26, the load transmission key 31 is substantially inserted into the cylinder side key groove 26 and the shaft side key groove 16. Lock evenly. Thereby, the relative movement of the pin joint 10 and the box joint 20 in the axial center X direction is restrained.

ピン継手１０とボックス継手２０との周方向の相対移動の拘束は、回転止めキー３２によって行う。具体的には、軸側基部１１の外周部のうち軸側接合面１３付近を切り欠いて第一溝１７を形成し、嵌受部２２の外周部のうち筒側接合面２３付近を切り欠いて第二溝２７を形成する。第一溝１７の周方向の長さと、第二溝２７の周方向の長さとは互いに一致させてある。また、第一溝１７の軸芯Ｘ方向の長さと、第二溝２７の軸芯Ｘ方向の長さとについても互いに一致させてある。ピン継手１０をボックス継手２０に挿入した状態において、第一溝１７と第二溝２７とを位置合わせし、第一溝１７と第二溝２７とに跨るように回転止めキー３２を合致させ、ボルトを回転止めキー３２と第一溝１７に設けたネジ孔に締め込んで固定する。これにより、ピン継手１０とボックス継手２０との周方向の相対移動が拘束される。 The rotation of the circumferential direction relative to the pin joint 10 and the box joint 20 is restricted by the rotation stop key 32. Specifically, the first groove 17 is formed by cutting out the vicinity of the shaft-side joint surface 13 in the outer peripheral portion of the shaft-side base portion 11, and the vicinity of the tube-side joint surface 23 is cut out in the outer peripheral portion of the fitting receiving portion 22. The second groove 27 is formed. The circumferential length of the first groove 17 and the circumferential length of the second groove 27 are made to coincide with each other. Further, the length of the first groove 17 in the axis X direction and the length of the second groove 27 in the axis X direction are also made to coincide with each other. In a state where the pin joint 10 is inserted into the box joint 20, the first groove 17 and the second groove 27 are aligned, and the rotation key 32 is matched so as to straddle the first groove 17 and the second groove 27. The bolt is tightened and fixed in the screw hole provided in the rotation stop key 32 and the first groove 17. Thereby, the relative movement in the circumferential direction between the pin joint 10 and the box joint 20 is restricted.

以上のようにして、ピン継手１０とボックス継手２０とは挿入嵌合される。なお、軸側凹部１４と筒側凸部２４との係合、軸側凸部１５と筒側凹部２５との係合によって、ピン継手１０とボックス継手２０との嵌合が強化され、特に曲げに対する剛性が高まる。荷重伝達キー３１の数や回転止めキー３２の数は、上杭２及び下杭１の菅径等によって適宜設定すれば良い。 As described above, the pin joint 10 and the box joint 20 are inserted and fitted. Note that the engagement between the pin joint 10 and the box joint 20 is enhanced by the engagement between the shaft-side concave portion 14 and the cylinder-side convex portion 24, and the engagement between the shaft-side convex portion 15 and the cylinder-side concave portion 25, and in particular bending. The rigidity against is increased. What is necessary is just to set suitably the number of the load transmission keys 31 and the number of the rotation stop keys 32 with the diameter of the upper pile 2, the lower pile 1, etc. FIG.

なお、上記では説明の便宜のため、隣り合う２つの鋼管を上杭２及び下杭１として説明したが、実際には、各鋼管には一方の端部にピン継手１０が接合され、他方の端部にボックス継手２０が接合されている。本実施形態では、各鋼管はピン継手１０側の端部を上方にボックス継手２０側の端部を下方に向けて配置され、隣り合う２つの鋼管のうち上方に位置する鋼管を上杭２と称し、下方に位置する鋼管を下杭１と称している。 In the above description, two adjacent steel pipes have been described as the upper pile 2 and the lower pile 1 for the convenience of explanation. However, in reality, a pin joint 10 is joined to one end of each steel pipe, A box joint 20 is joined to the end. In this embodiment, each steel pipe is arranged with the end on the pin joint 10 side facing upward and the end on the box joint 20 side facing downward, and the steel pipe positioned above among the two adjacent steel pipes is the upper pile 2. The steel pipe located below and called the lower pile 1 is called.

なお、このように一組の軸側キー溝１６、筒側キー溝２６、及び、荷重伝達キー３１によって、ピン継手１０とボックス継手２０との軸芯Ｘ方向の相対移動を拘束する継手構造を、以下、「一段型の継手構造」と称することにする。なお、鋼管同士の接続は上記の継手構造に限定されるものではなく、溶接継手や、例えば、特開平０９−１５８１７７号公報、特開２０１０−１８０６９３号公報、実公昭５８−１７７８９号公報、及び、特開２０１１−１６２９６３号公報に記載されたものなど、公知の種々の構造を適用することができる。 In addition, the joint structure that restrains the relative movement of the pin joint 10 and the box joint 20 in the axial center X direction by the pair of the shaft side key groove 16, the cylinder side key groove 26, and the load transmission key 31 in this way. Hereinafter, it will be referred to as “one-stage joint structure”. The connection between the steel pipes is not limited to the joint structure described above, but is a welded joint, for example, JP 09-158177 A, JP 2010-180693 A, Japanese Utility Model Publication No. 58-17789, and Various known structures such as those described in JP 2011-162963 A can be applied.

〔杭頭と鋼管の継手構造〕
以下に詳述するとおり、本実施形態において、杭頭と鋼管の継手構造は、回転止めキー３２を備えない点を除いて、上記の鋼管の継手構造と同様である。
即ち、上記のとおり、上端の鋼管（上杭２）の先端部には、工場において雄形のピン継手１０が溶接により固着されている。 [Pile head and steel pipe joint structure]
As described in detail below, in this embodiment, the joint structure of the pile head and the steel pipe is the same as the above-described joint structure of the steel pipe except that the rotation stopper key 32 is not provided.
That is, as described above, the male pin joint 10 is fixed to the tip of the upper end steel pipe (upper pile 2) by welding at the factory.

図１，３，４に示すように、杭頭６は鋼管で構成され、先端側（上端側）には、鉄筋籠７０が溶接により固着されている。また、杭頭６のうち上杭２の側の先端部には、工場においてピン継手１０（軸状継手部）に外嵌されるボックス継手６０（筒状継手部）が溶接により固着されている。ここで、「ピン継手１０」及び「ボックス継手６０」は、本発明の鋼管杭と杭頭との「継手部」に相当する。また、鉄筋籠７０は本発明の「杭頭側定着鉄筋」に相当する。 As shown in FIGS. 1, 3, and 4, the pile head 6 is formed of a steel pipe, and a reinforcing bar 70 is fixed to the front end side (upper end side) by welding. A box joint 60 (cylindrical joint portion) that is externally fitted to the pin joint 10 (shaft joint portion) in the factory is fixed to the tip of the pile head 6 on the upper pile 2 side by welding. . Here, the “pin joint 10” and the “box joint 60” correspond to the “joint portion” between the steel pipe pile and the pile head of the present invention. The reinforcing bar 70 corresponds to the “pile head side fixing reinforcing bar” of the present invention.

ピン継手１０は、図３，４に示すごとく、上杭２と同様に筒状に形成されている。ピン継手１０は、上杭１に固着される軸側基部１１と、軸側基部１１から延設されると共に外径が軸側基部１１よりも小さい嵌挿部１２と、軸側基部１１と嵌挿部１２との段差部である軸側接合面１３と、軸側接合面１３に周設された軸側凹部１４と、嵌挿部１２の先端部に周設された軸側凸部１５と、を備えている。 As shown in FIGS. 3 and 4, the pin joint 10 is formed in a cylindrical shape like the upper pile 2. The pin joint 10 includes a shaft-side base portion 11 fixed to the upper pile 1, a fitting insertion portion 12 that extends from the shaft-side base portion 11 and has an outer diameter smaller than that of the shaft-side base portion 11, and the shaft-side base portion 11. A shaft side joint surface 13 which is a stepped portion with the insertion portion 12, a shaft side concave portion 14 provided around the shaft side joint surface 13, and a shaft side convex portion 15 provided around the distal end portion of the fitting insertion portion 12. It is equipped with.

ボックス継手６０は、図３，４に示すごとく、杭頭６と同様に筒状に形成されている。ボックス継手６０は、杭頭６に固着される筒側基部６１と、嵌挿部１２を受け入れる嵌受部６２と、嵌受部６２の先端部に設けられ、軸側接合面１３と接する筒側接合面６３と、筒側接合面６３に周設され、軸側凹部１４と係合する筒側凸部６４と、筒側基部６１と嵌受部６２との段差部に周設され、軸側凸部１５と係合する筒側凹部６５と、を備えている。 As shown in FIGS. 3 and 4, the box joint 60 is formed in a cylindrical shape like the pile head 6. The box joint 60 is provided on the cylinder-side base 61 fixed to the pile head 6, the fitting receiving part 62 that receives the fitting insertion part 12, and the cylinder side that is in contact with the shaft-side joining surface 13. Around the joint surface 63, the tube side joint surface 63, the tube side convex portion 64 that engages with the shaft side recessed portion 14, and the step portion between the tube side base portion 61 and the fitting receiving portion 62, the shaft side A cylinder-side recess 65 that engages with the protrusion 15.

図３，４に示すごとく、嵌挿部１２の外径と嵌受部６２の内径とはほぼ同一に設定してあり、ピン継手１０をボックス継手６０に挿入すると、嵌挿部１２の外周面と嵌受部６２の内周面とは密接し、軸側接合面１３と筒側接合面６３とも密接する。軸側凹部１４の軸芯Ｘ方向の断面形状は、筒側凸部６４と係合可能なよう設定してある。筒側凹部６５の軸芯Ｘ方向の断面形状は、軸側凸部１５と係合可能なよう設定してある。また、嵌挿部１２の内周面と筒側基部６１の内周面とは面一となるように設定してある。 As shown in FIGS. 3 and 4, the outer diameter of the fitting insertion portion 12 and the inner diameter of the fitting receiving portion 62 are set to be substantially the same, and when the pin joint 10 is inserted into the box joint 60, the outer peripheral surface of the fitting insertion portion 12. And the inner peripheral surface of the fitting receiving portion 62 are in close contact with each other, and the shaft side joint surface 13 and the tube side joint surface 63 are also in close contact with each other. The cross-sectional shape in the axis X direction of the shaft-side concave portion 14 is set so as to be able to engage with the tube-side convex portion 64. The cross-sectional shape of the tube side recess 65 in the axis X direction is set so as to be engageable with the shaft side protrusion 15. Further, the inner peripheral surface of the fitting insertion portion 12 and the inner peripheral surface of the tube side base portion 61 are set to be flush with each other.

嵌挿部１２の外周部に、軸芯Ｘの周方向に沿って一つの軸側キー溝１６を周設してある。同様に、嵌受部６２の内周部に、ボックス継手６０にピン継手１０を挿入したときに軸側キー溝１６と対応する一つの筒側キー溝６６を周設してある。軸側キー溝１６及び筒側キー溝６６の軸芯Ｘ方向の断面形状は、軸芯Ｘ方向の長さが同じである長方形にしてある。ボックス継手２０にピン継手１０を挿入したとき、軸側キー溝１６と筒側キー溝６６とは対向し、協働して長方形断面の一つの溝を構成する。 One shaft side keyway 16 is provided around the outer peripheral portion of the insertion portion 12 along the circumferential direction of the shaft core X. Similarly, one cylinder side key groove 66 corresponding to the shaft side key groove 16 when the pin joint 10 is inserted into the box joint 60 is provided around the inner periphery of the fitting receiving portion 62. The cross-sectional shape of the shaft side key groove 16 and the cylinder side key groove 66 in the axis X direction is a rectangle having the same length in the axis X direction. When the pin joint 10 is inserted into the box joint 20, the shaft side key groove 16 and the cylinder side key groove 66 face each other and cooperate to form one groove having a rectangular cross section.

嵌受部６２のうち筒側キー溝６６が設けられた箇所には、嵌受部６２の外周部から筒側キー溝６６に連通するネジ孔が、周方向に沿って間隔をおいて複数穿孔されている。そして、ネジ孔には、セットボルト３０を螺合させてあり、セットボルト３０はボックス継手６０の外側からの締め込み操作によって、径方向内側に螺進可能である。筒側キー溝６６には、「キー部材」としての荷重伝達キー３１が収容されている。荷重伝達キー３１にはセットボルト３０の先端部が固定されており、セットボルト３０の締め込み操作によって、荷重伝達キー３１は筒側キー溝６６内から径方向内側に突出可能である。 A plurality of screw holes communicating from the outer peripheral portion of the fitting receiving portion 62 to the cylinder side key groove 66 are formed at intervals in the circumferential direction at a portion of the fitting receiving portion 62 where the cylinder side key groove 66 is provided. Has been. A set bolt 30 is screwed into the screw hole, and the set bolt 30 can be screwed inward in the radial direction by a tightening operation from the outside of the box joint 60. The cylinder side keyway 66 accommodates a load transmission key 31 as a “key member”. The tip of the set bolt 30 is fixed to the load transmission key 31, and the load transmission key 31 can protrude radially inward from the cylinder side key groove 66 by the tightening operation of the set bolt 30.

以上のようにして、ピン継手１０とボックス継手６０とは挿入嵌合され、ピン継手１０とボックス継手２０との軸芯Ｘ方向の相対移動が拘束される。一方、ピン継手１０とボックス継手２０との相対回動は許容される。本実施形態では、ピン継手１０とボックス継手６０とは、特に回り止め等は設けていないので、３６０°に亘って相対回転可能である。また、ピン継手１０とボックス継手６０とをどのような相対回動位置にしようとも、荷重伝達キー３１の軸側キー溝１６及び筒側キー溝６６に対する係合長さは不変である。このため、ピン継手１０とボックス継手６０との相対回動位置に拘わらず、ピン継手１０とボックス継手６０との接続強度は略一定であり、ピン継手１０とボックス継手６０とを相対回動させても接続強度が低下することがない。従って、任意の相対回動位置において、設定された接続強度を維持することができる。
なお、荷重伝達キー３１の数は、上杭２及び杭頭６の菅径等によって適宜設定すれば良い。 As described above, the pin joint 10 and the box joint 60 are inserted and fitted, and the relative movement of the pin joint 10 and the box joint 20 in the axial center X direction is restricted. On the other hand, relative rotation between the pin joint 10 and the box joint 20 is allowed. In the present embodiment, the pin joint 10 and the box joint 60 are not particularly provided with a detent or the like, and thus can be relatively rotated over 360 °. In addition, the engagement length of the load transmission key 31 with respect to the shaft side key groove 16 and the cylinder side key groove 66 is unchanged regardless of the relative rotation position of the pin joint 10 and the box joint 60. For this reason, regardless of the relative rotational position of the pin joint 10 and the box joint 60, the connection strength between the pin joint 10 and the box joint 60 is substantially constant, and the pin joint 10 and the box joint 60 are relatively rotated. However, the connection strength does not decrease. Therefore, the set connection strength can be maintained at an arbitrary relative rotation position.
In addition, what is necessary is just to set the number of the load transmission keys 31 suitably with the diameter of the upper pile 2 and the pile head 6, etc. FIG.

上記の通り、本実施形態では、上杭２と杭頭６との継手構造についても、上杭２と下杭１１との継手構造と同様に、「一段型の継手構造」を採用している。このように、上杭２と杭頭６との継手構造についても、上杭２と下杭１１との継手構造と同様の継手構造を用いることにより、上端に位置する杭（上杭２）についても他の杭と同様に一方の端部にピン継手１０を他方の端部にボックス継手２０を設ければよいので、作製が容易である。また、上端に位置する杭（上杭２）と他の杭とを区別する必要が無いので現場における作業も容易になる。 As described above, in the present embodiment, the joint structure between the upper pile 2 and the pile head 6 adopts a “one-stage joint structure” as in the joint structure between the upper pile 2 and the lower pile 11. . Thus, also about the joint structure of the upper pile 2 and the pile head 6, about the pile (upper pile 2) located in an upper end by using the joint structure similar to the joint structure of the upper pile 2 and the lower pile 11 As with the other piles, the pin joint 10 may be provided at one end and the box joint 20 may be provided at the other end. Moreover, since it is not necessary to distinguish the pile (upper pile 2) and other pile which are located in an upper end, the operation | work in a field becomes easy.

〔コンクリート基礎の施工方法〕
上記の継手構造を有する鋼管杭１００を用いたコンクリート基礎（フーチング）の施工方法の一例について説明する。図１及び２に示すように、鋼管杭１００は打設を行いながら順次接合を行い、鋼管杭１００の上端（地上側）に杭頭６を接合する。上記工程を複数回繰り返し（又は、同時並行的に行い）、複数の鋼管杭１００が並列して設けられる。鋼管杭１００は杭頭６に設けられた鉄筋籠７０が地上に露出した状態となるように設けられる。上記のように複数並列された鋼管杭１００の鉄筋籠７０に定着鉄筋８０ａが挿通され、当該定着鉄筋８０ａが結束線により鉄筋籠７０の鉄筋７０ａに固着され、複数並列された鋼管杭１００の鉄筋籠７０同士が連結される。また、鉄筋籠７０に挿通した定着鉄筋８０ａに亘って鉄筋８０ｂが結束線により固着される。これにより、杭頭にコンクリート基礎用の定着鉄筋８０が設けられる。 [Concrete foundation construction method]
An example of a concrete foundation (footing) construction method using the steel pipe pile 100 having the above joint structure will be described. As shown in FIGS. 1 and 2, the steel pipe pile 100 is sequentially joined while being placed, and the pile head 6 is joined to the upper end (the ground side) of the steel pipe pile 100. The above process is repeated a plurality of times (or simultaneously in parallel), and a plurality of steel pipe piles 100 are provided in parallel. The steel pipe pile 100 is provided such that the reinforcing bar 70 provided on the pile head 6 is exposed to the ground. As described above, the fixed reinforcing bars 80a are inserted into the reinforcing bar rods 70 of the steel pipe piles 100 arranged in parallel, and the fixed reinforcing bars 80a are fixed to the reinforcing bars 70a of the reinforcing bar rods 70 by binding wires. The collars 70 are connected to each other. Further, the reinforcing bar 80b is fixed by the binding wire across the fixing reinforcing bar 80a inserted through the reinforcing bar rod 70. Thereby, the fixed reinforcement 80 for concrete foundations is provided in a pile head.

ここで、図２に示すように、複数の鉄筋籠７０に亘って定着鉄筋８０ａを挿通するため、各鉄筋籠７０において、定着鉄筋８０ａと鉄筋籠７０の鉄筋７０ａ、７０ｂとの干渉を防止する必要がある。そこで、定着鉄筋８０ａの挿通に先立ち、位置決め工程を行なう。具体的には、並列された鋼管杭１００の鉄筋籠７０に亘って定着鉄筋８０ａを挿通可能なように、杭頭６を鋼管杭１００に対して相対回動させて鉄筋籠７０の鉄筋７０ａ、７０ｂの位置を決定する。このように、各鋼管杭１００において、鋼管杭１００と当該鋼管杭１００に接続された杭頭６との相対回動位置が決めされ、コンクリート基礎の定着鉄筋８０ａを配設するに際し、定着鉄筋８０ａの配設位置との関係で決定される適切な配設位置に、夫々の杭頭６に設けられた杭頭側定着鉄筋７０ａ、７０ｂが配設される。 Here, as shown in FIG. 2, since the fixing reinforcing bars 80 a are inserted through the plurality of reinforcing bar rods 70, the interference between the fixing reinforcing bar 80 a and the reinforcing bars 70 a and 70 b of the reinforcing bar rods 70 is prevented in each reinforcing bar rod 70. There is a need. Therefore, a positioning step is performed prior to the insertion of the fixing reinforcing bars 80a. Specifically, the pile head 6 is relatively rotated with respect to the steel pipe pile 100 so that the fixed reinforcing bar 80a can be inserted over the reinforcing bar 70 of the steel pipe piles 100 arranged in parallel. The position of 70b is determined. Thus, in each steel pipe pile 100, relative rotation position of the steel pipe pile 100 and the pile head 6 connected to the said steel pipe pile 100 is determined, and when arranging the fixed reinforcement 80a of a concrete foundation, the fixed reinforcement 80a Pile head side fixing reinforcing bars 70a and 70b provided on the respective pile heads 6 are arranged at appropriate arrangement positions determined in relation to the arrangement positions of the pile heads.

上記の通り、ピン継手１０とボックス継手６０とは、３６０°に亘って相対回転可能である。このため、例えば、設計上の要請等で定着鉄筋８０ａを配設する位置を全く変更することができない場合や、既に配設されている定着鉄筋８０ａに対して杭頭側定着鉄筋７０ａ、７０ｂを接続する場合であっても、鋼管杭１００と当該鋼管杭１００に接続された杭頭６との相対回動位置を３６０°の範囲において位置決めすることができるので、杭頭側定着鉄筋７０ａ、７０ｂを確実に適切な位置に配置することができる。
また、上記の通り、ピン継手１０とボックス継手６０とは、任意の相対回動位置において、設定された接続強度を維持することができるので、鋼管杭１００と杭頭６との接続強度を損なうことなく、杭頭６を任意の相対回動位置に位置決めすることができる。
なお、例えばネジ継手等のように互いに相対回動させることにより締結部の締結具合が変化する継手構造では、本発明の継手構造とは異なり、相対回動により杭頭の高さが変化するため、杭頭側定着鉄筋の位置決めが困難である。また、相対回動により、ネジ締結部の締結具合が異なるので、接続強度も変化するため、接続強度の管理についても困難である。 As described above, the pin joint 10 and the box joint 60 are capable of relative rotation over 360 °. For this reason, for example, when it is not possible to change the position where the fixing reinforcing bar 80a is disposed at all due to a design requirement or the like, or when the fixing rebars 70a and 70b on the pile head side are attached to the fixing reinforcing bar 80a already disposed. Even if it is a case where it connects, since the relative rotational position of the steel pipe pile 100 and the pile head 6 connected to the said steel pipe pile 100 can be positioned in the range of 360 degrees, the pile head side fixed reinforcement 70a, 70b Can be reliably placed at an appropriate position.
Moreover, as above-mentioned, since the pin joint 10 and the box joint 60 can maintain the set connection strength in arbitrary relative rotation positions, the connection strength between the steel pipe pile 100 and the pile head 6 is impaired. Without this, the pile head 6 can be positioned at an arbitrary relative rotational position.
In addition, in the joint structure in which the fastening degree of the fastening portion is changed by relative rotation with each other, such as a threaded joint, for example, the height of the pile head is changed by the relative rotation unlike the joint structure of the present invention. , Positioning of the pile head side fixing rebar is difficult. Moreover, since the fastening degree of the screw fastening portion varies depending on the relative rotation, the connection strength also changes, so that it is difficult to manage the connection strength.

定着鉄筋の配設の後、杭頭６、鉄筋籠７０、及び、定着鉄筋８０が、コンクリート基礎内に埋設される。 After disposing the fixing reinforcing bars, the pile head 6, the reinforcing bar 70, and the fixing reinforcing bars 80 are embedded in the concrete foundation.

〔別実施形態〕
（１）上記実施形態では、「一段型の継手構造」の継手構造を採用する場合を例に説明したが、これに限られるものではない。例えば、図６に示すように二組の軸側キー溝１６ａ，１６ｂ、筒側キー溝２６ａ，２６ｂ（６６ａ，６６ｂ）、及び、荷重伝達キー３１によって、ピン継手１０とボックス継手２０（６０）との軸芯Ｘ方向の相対移動を拘束する「二段型の継手構造」を採用してもよい。また、キー溝を３組以上設けた構造を採用しても良い。また、例えば、鋼管杭１００と杭頭６との連結には、「一段型の継手構造」を用い、鋼管杭同士の連結には「二段型の継手構造」を用いるなど、異なる連結構造を用いてもよい。 [Another embodiment]
(1) In the above embodiment, the case where the joint structure of “one-stage joint structure” is employed has been described as an example, but the present invention is not limited to this. For example, as shown in FIG. 6, the pin joint 10 and the box joint 20 (60) are constituted by two sets of shaft side key grooves 16a and 16b, cylinder side key grooves 26a and 26b (66a and 66b), and the load transmission key 31. A “two-stage joint structure” that restricts relative movement in the direction of the axis X of the axis may be employed. Further, a structure in which three or more key grooves are provided may be employed. In addition, for example, a “one-stage joint structure” is used for the connection between the steel pipe pile 100 and the pile head 6, and a “two-stage joint structure” is used for the connection between the steel pipe piles. It may be used.

（２）また、上記実施形態では、鋼管杭１００と杭頭６との連結構造において、杭頭６にボックス継手６０を設け、上杭２にピン継手１０を設ける場合を例に説明したが、杭頭６にピン継手を設け、上杭２にボックス継手を設けてもよい。また、鋼管杭１００と杭頭６との連結は、鋼管杭１００に対する杭頭６の相対回動を許容し、鋼管杭１００と杭頭６との接続強度が低下しないのであれば、上記のものに限られない。また、鋼管杭１００に対する杭頭６の相対回動は必ずしも３６０°に亘って許容されるものでなくてもよい。 (2) Moreover, in the said embodiment, in the connection structure of the steel pipe pile 100 and the pile head 6, the case where the box joint 60 was provided in the pile head 6 and the pin joint 10 was provided in the upper pile 2 was demonstrated to the example, A pin joint may be provided on the pile head 6 and a box joint may be provided on the upper pile 2. In addition, the connection between the steel pipe pile 100 and the pile head 6 allows the relative rotation of the pile head 6 with respect to the steel pipe pile 100, and the above-described thing is possible as long as the connection strength between the steel pipe pile 100 and the pile head 6 does not decrease. Not limited to. Moreover, the relative rotation of the pile head 6 with respect to the steel pipe pile 100 does not necessarily need to be permitted over 360 degrees.

本発明は、コンクリート基礎に適用される鋼管杭と杭頭との継手構造、及び、この継手構造を用いたコンクリート基礎の施工に適用可能である。 INDUSTRIAL APPLICABILITY The present invention is applicable to a joint structure between a steel pipe pile and a pile head applied to a concrete foundation, and construction of a concrete foundation using this joint structure.

１下杭（隣接する鋼管）
２上杭（隣接する鋼管）
６杭頭
１０ピン継手（継手部）
２０ボックス継手（継手部）
６０ボックス継手（継手部）
７０鉄筋籠（杭頭側定着鉄筋）
８０ａ定着鉄筋
１００鋼管杭 1 Lower pile (adjacent steel pipe)
2 Upper pile (adjacent steel pipe)
6 Pile head 10 Pin joint (joint part)
20 Box joint (joint part)
60 Box joint (joint part)
70 Reinforcing bar (Pile head side anchoring rebar)
80a Anchoring bar 100 Steel pipe pile

Claims

It is a joint structure between a steel pipe pile and a pile head applied to a concrete foundation,
The pile head is configured integrally, and includes a pile head side fixed reinforcing bar embedded in the concrete foundation and connected to the fixed reinforcing bar of the concrete foundation at one end thereof, and the other end includes a joint portion. Connected to the tip of the steel pipe pile via the relative displacement in the longitudinal direction,
So disposing the pile cranial fixing rebars in disposed position determined in relation to the arrangement position of the fixing reinforcement of the concrete foundation, the joint portion, the connection between the said steel pipe pile pile A joint structure of a steel pipe pile and a pile head configured to allow relative rotation of the pile head with respect to the steel pipe pile in a maintained state.

The steel pipe pile is configured by connecting adjacent steel pipes via a joint part, and the joint part connecting the steel pipes is the same joint part as the joint part connecting the steel pipe pile and the pile head. The joint structure of the steel pipe pile of claim | item 1 and a pile head.

A plurality of steel pipe piles having the joint structure according to claim 1 or 2, wherein a plurality of the steel pipe piles are arranged in parallel in the ground in a state where the pile head side fixing reinforcing bar provided on the pile head is exposed. A concrete foundation construction method for providing a concrete foundation over
When arranging the fixing reinforcing bars of the concrete foundation, in order to arrange the pile head side fixing reinforcing bars provided in the respective pile heads at the arrangement positions determined in relation to the arrangement positions of the fixing reinforcing bars, A concrete foundation construction method for performing a positioning step of positioning a relative rotation position between the steel pipe pile and a pile head connected to the steel pipe pile.