JP7497737B2 - Method for rotating joint of steel pipe pile with fluid supply pipe, steel pipe pile with fluid supply pipe - Google Patents

Method for rotating joint of steel pipe pile with fluid supply pipe, steel pipe pile with fluid supply pipe Download PDF

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JP7497737B2
JP7497737B2 JP2022069930A JP2022069930A JP7497737B2 JP 7497737 B2 JP7497737 B2 JP 7497737B2 JP 2022069930 A JP2022069930 A JP 2022069930A JP 2022069930 A JP2022069930 A JP 2022069930A JP 7497737 B2 JP7497737 B2 JP 7497737B2
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名央 寺尾
良典 松井
進吾 粟津
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Description

本発明は回転接合される鋼管杭の回転接合方法に関し、特に杭軸方向に配設されて杭内面及び／または杭先端に流体を供給する流体供給管を備えた流体供給管付き鋼管杭の回転接合方法、流体供給管付き鋼管杭に関する。 The present invention relates to a rotary joining method for steel pipe piles, and in particular to a rotary joining method for steel pipe piles with a fluid supply pipe that is arranged in the axial direction of the pile and supplies fluid to the inner surface and/or tip of the pile, and to a steel pipe pile with a fluid supply pipe.

鋼管杭の接合には溶接継手が使われることが一般的であるが、火気が使えない場合や、接合時間を短縮する必要がある場合など、継ぎ部に機械式継手を用いるケースが増えてきており、このような機械式継手のひとつにねじ継手がある（特許文献１参照）。 Welded joints are generally used to join steel pipe piles, but mechanical joints are increasingly being used for the joints in cases where fire cannot be used or where it is necessary to shorten the joining time, and one such mechanical joint is the screw joint (see Patent Document 1).

また、鋼管杭を打設する場合、施工性を向上させるため、流体供給管を鋼管杭の上端から下端まで鋼管杭内面に沿って配管し、流体供給管に水、掘削液、空気等を供給して杭下端等から吐出することが行われる（特許文献２、３参照）。 In addition, when driving steel pipe piles, in order to improve workability, a fluid supply pipe is laid along the inner surface of the steel pipe pile from the top to the bottom, and water, drilling fluid, air, etc. are supplied to the fluid supply pipe and discharged from the bottom end of the pile (see Patent Documents 2 and 3).

流体供給管は、通常、工場や現場で事前に鋼管内面に取り付けられている（固定バンドや溶接等で固定）。（特許文献３：下杭側のパイプ固定）
鋼管杭に継ぎ（現場縦継ぎ溶接部または、置き場での横継溶接部）がある場合、上杭位置決め後、継ぎ部位置での流体供給管はソケットやジョイントパイプなどの部材を介して接続（連結）し、その後に上杭と下杭を溶接する。 The fluid supply pipe is usually attached to the inner surface of the steel pipe in advance at a factory or on-site (fixed with a fixing band, welding, etc.) (Patent Document 3: Fixing of the pipe on the lower pile side)
If the steel pipe pile has a joint (a vertical joint welded on-site or a horizontal joint welded at the storage site), after the upper pile is positioned, the fluid supply pipe at the joint position is connected (coupled) via a component such as a socket or joint pipe, and then the upper pile and lower pile are welded.

特許第6575553号公報Patent No. 6575553 特許第4242251号公報Patent No. 4242251 特開2018-123670号公報JP 2018-123670 A 特許第6354911号公報Patent No. 6354911

鋼管杭を継杭しながら打設するに際して、流体供給管を鋼管杭の内面に配設する場合、打設時に鋼管内部に流入する土の土圧などに流体供給管が耐え切れず、破損してしまう可能性がある。そのため、流体供給管は鋼管杭の打設前に鋼管杭の内面に固定する必要がある。
また、打設されている下杭に上杭を接合する際には、上杭内に流体供給管を挿通した状態で、下杭と上杭を接合する前に、下杭側の流体供給管の上端と上杭側の流体供給管の下端を接合し、その後、下杭と上杭を接合することになる。 When installing a fluid supply pipe on the inner surface of a steel pipe pile while driving the piles, the fluid supply pipe may not be able to withstand the soil pressure of the soil that flows into the steel pipe during driving and may be damaged. Therefore, the fluid supply pipe needs to be fixed to the inner surface of the steel pipe pile before driving the steel pipe.
In addition, when joining the upper pile to the lower pile that has already been driven in, with the fluid supply pipe inserted into the upper pile, the upper end of the fluid supply pipe on the lower pile side is joined to the lower end of the fluid supply pipe on the upper pile side before joining the lower pile and the upper pile, and then the lower pile and upper pile are joined.

しかし、上杭と下杭の接合をねじ継手で行う場合において、上杭側の流体供給管の下端を下杭側の流体供給管の上端に接合し、かつ流体供給管をその全長に亘って上杭に固定した場合、上杭を回転させることができず、上杭を下杭に回転接合できないという問題があった。
なお、上記の問題は回転接合する機構としてねじ継手を用いたものに限られず、例えば特許文献４に開示された継手のように、外側継手管に内側継手管を挿入完了位置まで挿入して、挿入完了状態で外側継手管又は内側継手管を所定角度回転することで両者が係合して回転接合されるものでも同様の問題がある。 However, when the upper pile and lower pile are joined with a screw joint, if the lower end of the fluid supply pipe on the upper pile side is joined to the upper end of the fluid supply pipe on the lower pile side and the fluid supply pipe is fixed to the upper pile along its entire length, there is a problem that the upper pile cannot be rotated and cannot be rotatably joined to the lower pile.
The above problem is not limited to joints that use a threaded joint as a rotary joining mechanism. For example, a similar problem occurs in joints such as the one disclosed in Patent Document 4, in which an inner joint pipe is inserted into an outer joint pipe to a fully inserted position, and then the outer joint pipe or the inner joint pipe is rotated through a predetermined angle in the fully inserted state, thereby engaging and joining the two.

本発明はかかる課題を解決するためになされたものであり、回転接合されると共に杭内面及び／または杭先端に流体を供給する流体供給管を備えた流体供給管付き鋼管杭において、ねじ継手等による回転接合が可能な流体供給管付き鋼管杭の回転接合方法を提供することを目的としている。
また、このような回転接合を可能とする流体供給管付き鋼管杭を提供することを目的としている。 The present invention has been made to solve such problems, and aims to provide a rotary joining method for a steel pipe pile with a fluid supply pipe, which is rotary joined and has a fluid supply pipe that supplies fluid to the inner surface of the pile and/or the tip of the pile, and which allows rotary joining using a screw joint or the like.
Another object of the present invention is to provide a steel pipe pile with a fluid supply pipe that enables such a rotary joint.

（１）本発明に係る鋼管杭の回転接合方法は、回転接合されると共に杭軸方向に配設されて杭内面及び／または杭先端に流体を供給する流体供給管を備えた流体供給管付き鋼管杭の回転接合方法であって、
下杭側流体供給管が取り付けられて地盤に打設された下杭の上方に、上杭側流体供給管が内面側に保持された上杭を吊り支持する上杭吊り支持工程と、前記上杭側流体供給管を前記下杭側流体供給管に接続する流体供給管接続工程と、前記上杭側流体供給管の上部を前記上杭に対して周方向の移動を規制した状態で前記上杭を前記下杭に回転接合する杭回転接合工程と、を備え、
上杭吊り支持工程において、前記上杭側流体供給管はその上部が前記上杭の内面に対して周方向に移動しないように移動規制されており、前記杭回転接合工程においては、回転接合開始時に前記上杭側流体供給管に生じた前記上杭内面に沿う撓みが解消するように回転接合が行われることを特徴とするものである。 (1) The rotary joining method for a steel pipe pile according to the present invention is a rotary joining method for a steel pipe pile with a fluid supply pipe that is rotary joined and arranged in the pile axial direction to supply a fluid to the inner surface and/or the tip of the pile,
The method includes an upper pile suspending and supporting process for suspending and supporting an upper pile, with an upper pile fluid supply pipe held on its inner side, above a lower pile that has a lower pile fluid supply pipe attached and is driven into the ground; a fluid supply pipe connecting process for connecting the upper pile fluid supply pipe to the lower pile fluid supply pipe; and a pile rotation joining process for rotationally joining the upper pile to the lower pile while restricting the upper part of the upper pile fluid supply pipe from moving in the circumferential direction relative to the upper pile,
In the upper pile hanging support process, the movement of the upper pile side fluid supply pipe is restricted so that its upper part does not move circumferentially relative to the inner surface of the upper pile, and in the pile rotation joining process, the rotation joining is performed so as to eliminate the deflection along the inner surface of the upper pile that occurs in the upper pile side fluid supply pipe at the start of rotation joining.

（２）上記（１）に記載のものにおいて、前記上杭吊り支持工程において、前記上杭側流体供給管はその上部が前記上杭の内面に対して周方向及び径方向に移動せず、軸方向に移動可能なように移動規制されていることを特徴とするものである。 (2) In the above-mentioned (1), in the upper pile suspension support process, the upper part of the upper pile side fluid supply pipe is restricted in movement so as to be movable in the axial direction but not in the circumferential or radial direction relative to the inner surface of the upper pile.

（３）また、上記（１）又は（２）に記載のものにおいて、前記杭回転接合工程の完了時に前記上杭側流体供給管の下部が前記上杭の下部内面に対して周方向の移動が規制される上杭側流体供給管下部周方向移動規制工程をさらに備え、
該上杭側流体供給管下部周方向移動規制工程は、上杭内面に設けた係合部に前記上杭側流体供給管が係合することで、前記上杭側流体供給管の周方向移動が規制されることを特徴とするものである。 (3) In addition, in the above-described (1) or (2), a lower part of the upper pile side fluid supply pipe is restricted from moving in a circumferential direction relative to the lower inner surface of the upper pile at the completion of the pile rotary joining process.
The process of restricting the circumferential movement of the lower part of the upper pile side fluid supply pipe is characterized in that the circumferential movement of the upper pile side fluid supply pipe is restricted by the upper pile side fluid supply pipe engaging with an engaging portion provided on the inner surface of the upper pile.

（４）また、上記（３）に記載のものにおいて、前記係合部は、杭軸方向に延びて前記上杭側流体供給管が挿入される溝部と、該溝部に向かって登り傾斜となる傾斜面部とを備えてなり、
上杭側流体供給管下部周方向移動規制工程は、前記上杭側流体供給管が径方向に移動することで前記傾斜面部を乗り越えて前記溝部に挿入されることを特徴とするものである。 (4) In addition, in the above-described (3), the engagement portion includes a groove portion extending in the pile axial direction and into which the upper pile-side fluid supply pipe is inserted, and an inclined surface portion that slopes upward toward the groove portion,
The process of restricting the circumferential movement of the lower part of the upper pile side fluid supply pipe is characterized in that the upper pile side fluid supply pipe moves radially to overcome the inclined surface portion and be inserted into the groove portion.

（５）本発明に係る流体供給管付き鋼管杭は、鋼管と、該鋼管の端部に設けられた継手部と、前記鋼管の管軸方向に配設されて鋼管内面及び／または鋼管先端に流体を供給する流体供給管を備えたものであって、
前記鋼管上部内面に設けられて前記流体供給管を周方向に移動しないように移動規制する移動規制部と、
前記鋼管下部内面に設けられて前記流体供給管に係合して該流体供給管の周方向の移動を規制する係合部と、を備え、
該係合部と前記移動規制部とは、鋼管内面における周方向同位置に設けられていることを特徴とするものである。 (5) The steel pipe pile with a fluid supply pipe according to the present invention comprises a steel pipe, a joint portion provided at an end of the steel pipe, and a fluid supply pipe arranged in the axial direction of the steel pipe to supply a fluid to the inner surface and/or the tip of the steel pipe,
A movement restricting portion provided on the inner surface of the upper portion of the steel pipe to restrict the movement of the fluid supply pipe so as not to move in the circumferential direction;
an engaging portion provided on the inner surface of the lower part of the steel pipe and engaging with the fluid supply pipe to restrict circumferential movement of the fluid supply pipe;
The engaging portion and the movement restricting portion are characterized in that they are provided at the same circumferential position on the inner surface of the steel pipe.

（６）また、上記（５）に記載のものにおいて、前記移動規制部は、前記流体供給管を周方向及び径方向に移動せず、軸方向には移動可能なように移動規制することを特徴とするものである。 (6) Furthermore, in the above (5), the movement restriction portion is characterized in that it restricts the movement of the fluid supply pipe so that it cannot move in the circumferential and radial directions, but can move in the axial direction.

（７）また、上記（５）又は（６）に記載のものにおいて、前記係合部は、杭軸方向に延びて前記流体供給管が挿入される溝部と、該溝部に向かって登り傾斜となる傾斜面部とを備えてなることを特徴とするものである。 (7) In addition, in the above (5) or (6), the engagement portion is characterized by having a groove portion extending in the pile axial direction and into which the fluid supply pipe is inserted, and an inclined surface portion that slopes upward toward the groove portion.

本発明によれば、回転接合されると共に杭先端に流体を供給する流体供給管を備えた鋼管杭において、上杭と下杭の回転接合を容易にかつ効率よく行うことができる。 According to the present invention, in a steel pipe pile that is rotary joined and equipped with a fluid supply pipe that supplies fluid to the tip of the pile, the upper pile and the lower pile can be rotary joined easily and efficiently.

本発明の実施の形態に係る流体供給管付き鋼管杭５の回転接合方法の施工手順の説明図である。1 is an explanatory diagram of a construction procedure of a rotary joining method for a steel pipe pile 5 with a fluid supply pipe according to an embodiment of the present invention. FIG. 実施の形態における上杭５ａを吊り支持する工程で用いる部材の説明図である。An explanatory diagram of the members used in the process of suspending and supporting the upper pile 5a in the embodiment. 実施の形態における上杭５ａを吊り支持する工程の一例の説明図である。FIG. 11 is an explanatory diagram of an example of a process for suspending and supporting the upper pile 5a in the embodiment. 実施の形態における上杭５ａを吊り支持する工程で用いる三又部材の設置方法の説明図である。An explanatory diagram of a method of installing a three-pronged member used in the process of suspending and supporting the upper pile 5a in an embodiment. 実施の形態における上杭５ａを吊り支持する工程で用いる移動規制部の説明図である。An explanatory diagram of a movement restriction part used in the process of suspending and supporting the upper pile 5a in the embodiment. 実施の形態における流体供給管接続工程で用いる接続部材の説明図である。6A to 6C are explanatory diagrams of a connecting member used in a fluid supply pipe connecting step in the embodiment. 上杭側流体供給管３ａの周方向の移動規制を行った状態の施工例の説明図であり、（ａ）は移動規制部材１２を、（ｂ）は上杭側流体供給管３ａを２本配設した様子を、（ｃ）は上杭側流体供給管３ａがねじれる様子を、それぞれ示している。This is an explanatory diagram of a construction example in which the circumferential movement of the upper pile side fluid supply pipe 3a is restricted, where (a) shows the movement restriction member 12, (b) shows the arrangement of two upper pile side fluid supply pipes 3a, and (c) shows the twisting of the upper pile side fluid supply pipe 3a. 実施の形態における上杭側流体供給管３ａの下部の周方向移動規制を行う場合に用いる係合部の説明図である。13 is an explanatory diagram of an engagement portion used when restricting circumferential movement of the lower portion of the upper pile side fluid supply pipe 3a in the embodiment. FIG. 実施の形態における杭回転接合工程における上杭上部、上杭下部、下杭の相対関係の説明図である。An explanatory diagram of the relative relationship between the upper pile top, the lower pile bottom, and the lower pile in the pile rotary joining process in an embodiment.

本実施の形態では、杭を回転接合するための機構として、杭端部にねじ継手１を用いる場合を例に挙げて説明する。
本発明に係る鋼管杭の回転接合方法は、図１に示すように、回転接合されると共に杭軸方向に配設されて杭内面及び／または杭先端に流体を供給する流体供給管３を備えた流体供給管付き鋼管杭５の回転接合方法であって、下杭側流体供給管３ｂが取り付けられて地盤に打設された下杭５ｂの上方に、上杭側流体供給管３ａが内面側に保持された上杭５ａを吊り支持する上杭吊り支持工程と、上杭側流体供給管３ａを下杭側流体供給管３ｂに接続する流体供給管接続工程と、上杭側流体供給管３ａの上部を上杭５ａに対して周方向の移動を規制した状態で上杭５ａを下杭５ｂに回転接合する杭回転接合工程と、を備えている。
以下、各工程と各工程に用いる機器について説明する。
なお、本発明においては外径が、φ300mm～φ2000mm程度の鋼管杭を対象としている。 In this embodiment, an example will be described in which a threaded joint 1 is used at the end of a pile as a mechanism for rotary joining the pile.
The rotary joining method for steel pipe piles according to the present invention is a rotary joining method for a steel pipe pile 5 with a fluid supply pipe 3 that is rotary joined and arranged in the axial direction of the pile to supply fluid to the inner surface and/or the tip of the pile, as shown in FIG. 1, and includes an upper pile hanging support process for hanging and supporting an upper pile 5a, which has an upper pile side fluid supply pipe 3a held on its inner surface, above a lower pile 5b to which a lower pile side fluid supply pipe 3b is attached and which is driven into the ground, a fluid supply pipe connecting process for connecting the upper pile side fluid supply pipe 3a to the lower pile side fluid supply pipe 3b, and a pile rotary joining process for rotary joining the upper pile 5a to the lower pile 5b while restricting the upper part of the upper pile side fluid supply pipe 3a from moving in the circumferential direction relative to the upper pile 5a.
Each step and the equipment used in each step will be described below.
In addition, the present invention is intended for steel pipe piles having an outer diameter of about φ300 mm to φ2000 mm.

＜上杭吊り支持工程＞
上杭吊り支持工程は、下杭側流体供給管３ｂが取り付けられて地盤に打設された下杭５ｂの上方に、上杭側流体供給管３ａが内面側に保持された上杭５ａを吊り支持する工程である（図１（ａ）参照）。
上杭吊り支持工程において、上杭側流体供給管３ａはその上部が上杭５ａの内面に対して周方向移動しないが、軸方向には移動可能なように移動規制されている。 <Upper pile suspension support process>
The upper pile hanging support process is a process of hanging and supporting the upper pile 5a, with the upper pile side fluid supply pipe 3a held on its inner side, above the lower pile 5b, which has a lower pile side fluid supply pipe 3b attached and is driven into the ground (see Figure 1 (a)).
In the upper pile suspension support process, the upper part of the upper pile side fluid supply pipe 3a does not move circumferentially relative to the inner surface of the upper pile 5a, but is restricted in movement so as to be movable in the axial direction.

上杭吊り支持工程においては、鋼管を吊り支持する部材と上杭側流体供給管３ａの上部の移動規制をする部材（以下、単に「移動規制部材」）が必要となるので、これらの部材について以下説明する。 The upper pile suspension support process requires a member for suspending and supporting the steel pipe and a member for restricting the movement of the upper part of the upper pile side fluid supply pipe 3a (hereinafter simply referred to as the "movement restriction member"). These members are described below.

《鋼管を吊り支持するための部材》
鋼管を吊り支持するための部材としては、例えば図２に示す、吊天秤７（図２（ａ））と三又部材９（図２（ｂ））が挙げられる。 <<Members for suspending and supporting steel pipes>>
Examples of members for suspending and supporting the steel pipe include a suspension balance 7 (FIG. 2(a)) and a three-pronged member 9 (FIG. 2(b)) shown in FIG.

吊天秤７は、図３に示すように、ねじ継手１を有する上杭５ａを２箇所で吊り、上杭５ａは吊天秤７で吊られることで、吊天秤７と共に回転できる。
三又部材９は、上杭側流体供給管３ａを上杭５ａ内に配置した状態で保持するための部材である。 As shown in FIG. 3 , the hoist 7 suspends the upper pile 5 a having the screw joint 1 at two points, and the upper pile 5 a is suspended by the hoist 7 so that it can rotate together with the hoist 7 .
The three-pronged member 9 is a member for holding the upper pile side fluid supply pipe 3a in a position inside the upper pile 5a.

三又部材９は、図２（ｂ）に示すように、１２０度の間隔で配置された３つの辺部９ａの基端部が中央で接合され、各辺部９ａの先端には上杭側流体供給管３ａを挿通するための長穴９ｂ（図４参照）が設けられている。三又部材９を用いることで、３本の上杭側流体供給管３ａを保持することができる。
三又部材９は、長穴９ｂに上杭側流体供給管３ａを挿通して保持した状態で上杭５ａに仮り取付（着脱可能な固定具で一時的に固定すること）し、図３に示す吊天秤７の中央部に設けたチェーン１１などで吊り下げて、上杭５ａの上端面近傍に配置する。
三又部材９に設けた長穴９ｂは径方向に長いので、長穴９ｂに挿通されている上杭側流体供給管３ａは長穴９ｂ内を径方向に移動することができる。 As shown in Fig. 2(b), the three-pronged member 9 has three sides 9a arranged at intervals of 120 degrees, the base ends of which are joined in the center, and the tip of each side 9a is provided with a long hole 9b (see Fig. 4) for inserting the upper pile side fluid supply pipe 3a. By using the three-pronged member 9, three upper pile side fluid supply pipes 3a can be held.
The three-pronged member 9 is temporarily attached (temporarily fixed with a removable fixing device) to the upper pile 5a with the upper pile side fluid supply pipe 3a inserted and held through the long hole 9b, and is suspended by a chain 11 or the like provided in the center of the suspension balance 7 shown in Figure 3 and positioned near the upper end surface of the upper pile 5a.
Since the long hole 9b provided in the three-way member 9 is long in the radial direction, the upper pile side fluid supply pipe 3a inserted into the long hole 9b can move radially within the long hole 9b.

《移動規制部材》
移動規制部材１２は、上杭側流体供給管３ａの上部が上杭５ａの内面に対して周方向及び径方向に移動しないが、軸方向には移動可能なように移動規制する部材である。
移動規制部材１２の具体例としては、図５（ａ）に示すように、挿通された上杭側流体供給管３ａを囲むような箱状部材や、図５（ｂ）に示すように、上杭側流体供給管３ａが挿入可能は隙間を空けて対向配置された一対のブロック体１２ａと挿入された上杭側流体供給管３ａが抜け出すのを防止する蓋部材１２ｂで構成されたものが例示できる。
なお、上記の移動規制部材１２は、上杭側流体供給管３ａの上部に対して、周方向及び径方向に移動しないようにしたものであるが、本発明に係る移動規制部材は、上杭側流体供給管の上部の径方向の移動規制を必須とするものではなく、周方向の移動規制のみで径方向の移動規制を行わないものも含む。例えば、図５（ｂ）に示す例において、蓋部材１２ｂがない態様も含む。このような場合であっても、ブロック体１２ａの高さがある程度あれば、上杭側流体供給管３ａがブロック体１２ａによって形成された隙間から飛び出ることはなく、周方向の移動規制が可能なためである。
もっとも、図５（ｂ）で示されるように、蓋部材１２ｂを設けて上杭側流体供給管３ａが径方向に移動しないようにした方が、後述する杭回転接合工程において、上杭側流体供給管３ａが移動規制部材１２から外れてしまうことを防止して、周方向の移動規制を確実に行うことができる。
さらに、移動規制部材１２の形状は特に限定されるものではなく、上杭側流体供給管３ａの上部が周方向に移動しないが、軸方向には移動可能なようにできればよい。 <Movement restriction member>
The movement restricting member 12 is a member that restricts the movement of the upper part of the upper pile side fluid supply pipe 3a so that it does not move circumferentially or radially relative to the inner surface of the upper pile 5a but can move axially.
Specific examples of the movement-restricting member 12 include a box-shaped member that surrounds the inserted upper pile side fluid supply pipe 3a, as shown in Figure 5 (a), and a pair of block bodies 12a arranged opposite each other with a gap so that the upper pile side fluid supply pipe 3a can be inserted, as shown in Figure 5 (b), and a cover member 12b that prevents the inserted upper pile side fluid supply pipe 3a from slipping out.
The above-mentioned movement restricting member 12 is designed to prevent the upper part of the upper pile side fluid supply pipe 3a from moving in the circumferential and radial directions, but the movement restricting member according to the present invention does not necessarily restrict the radial movement of the upper part of the upper pile side fluid supply pipe, and includes a movement restricting member that only restricts the circumferential movement and does not restrict the radial movement. For example, in the example shown in Figure 5 (b), it also includes a mode in which there is no cover member 12b. Even in such a case, if the block body 12a has a certain height, the upper pile side fluid supply pipe 3a will not jump out of the gap formed by the block body 12a, and the circumferential movement can be restricted.
However, as shown in Figure 5 (b), providing a cover member 12b to prevent the upper pile side fluid supply pipe 3a from moving radially can reliably restrict circumferential movement by preventing the upper pile side fluid supply pipe 3a from coming off the movement restricting member 12 during the pile rotation joining process described below.
Furthermore, the shape of the movement restricting member 12 is not particularly limited, but it is sufficient that the upper part of the upper pile side fluid supply pipe 3a is not moved in the circumferential direction but is movable in the axial direction.

なお、移動規制部材１２の機能として上杭側流体供給管３ａを軸方向に移動可能とする理由は、上杭５ａと下杭５ｂをねじ継手１によって回転接合する際に、上杭側流体供給管３ａが上杭５ａに対して軸方向に相対移動する必要があるからである。
もっとも、後述するように、上杭側流体供給管３ａと下杭側流体供給管３ｂの接続部にフレキシブルチューブ等の柔軟性のある部材を介在させる場合には、上杭側流体供給管３ａを軸方向に移動可能とする必要はない。 The reason why the movement restricting member 12 functions to allow the upper pile side fluid supply pipe 3a to move axially is because when the upper pile 5a and the lower pile 5b are rotationally joined by the screw joint 1, the upper pile side fluid supply pipe 3a needs to move axially relative to the upper pile 5a.
However, as will be described later, if a flexible member such as a flexible tube is interposed between the connection between the upper pile side fluid supply pipe 3a and the lower pile side fluid supply pipe 3b, it is not necessary for the upper pile side fluid supply pipe 3a to be able to move axially.

＜流体供給管接続工程＞
流体供給管接続工程は、上杭側流体供給管３ａを下杭側流体供給管３ｂに接続する工程である（図１（ｂ）参照）。
ねじ継手接合部付近の流体供給管３は、回転接合する継手付鋼管杭の鋼管内面形状に対応できるように、例えば、図６に示すように、ねじ継手１を避けるように鋼管内側に向けて屈曲する形状にする。上杭側流体供給管３ａの下端や下杭側流体供給管３ｂの上端の接続部は例えばカプラー１３によって接続する。接続用の部材としては、カプラー１３の他、ソケットやジョイントパイプ等でもよい。 <Fluid supply pipe connecting process>
The fluid supply pipe connecting process is a process of connecting the upper pile side fluid supply pipe 3a to the lower pile side fluid supply pipe 3b (see Figure 1 (b)).
The fluid supply pipe 3 near the threaded joint joint is bent toward the inside of the steel pipe to avoid the threaded joint 1, for example, as shown in Fig. 6, so that it can correspond to the shape of the inner surface of the steel pipe of the jointed steel pipe pile to be rotary joined. The connection parts of the lower end of the upper pile side fluid supply pipe 3a and the upper end of the lower pile side fluid supply pipe 3b are connected by, for example, a coupler 13. In addition to the coupler 13, the connection member may be a socket, a joint pipe, or the like.

上杭側流体供給管３ａを接続するのにカプラー１３等のように軸回りの回転ができるもので接続するようにしてもよい。その理由は、本実施の形態では、上杭側流体供給管３ａを下杭側流体供給管３ｂと接続し、上杭側流体供給管３ａの上端部を上杭５ａの上端部に移動規制させた状態で、上杭５ａを回転接合に必要な回転角だけ回転させるため、上側供給管３ａ全体をねじる方向の力が作用する。このとき、カプラー１３等のように軸回りの回転が可能なものであれば、上杭側流体供給管３ａ及び下杭側流体供給管３ｂの軸回りのねじれを緩和できる。 The upper pile side fluid supply pipe 3a may be connected using a device that can rotate around an axis, such as a coupler 13. The reason for this is that in this embodiment, the upper pile side fluid supply pipe 3a is connected to the lower pile side fluid supply pipe 3b, and the upper end of the upper pile side fluid supply pipe 3a is restricted from moving to the upper end of the upper pile 5a, and the upper pile 5a is rotated by the rotation angle required for rotary joining, so a force acts in the direction of twisting the entire upper supply pipe 3a. At this time, if a device that can rotate around an axis, such as a coupler 13, is capable of rotating around an axis, the twisting around the axis of the upper pile side fluid supply pipe 3a and the lower pile side fluid supply pipe 3b can be alleviated.

なお、カプラー１３等と流体供給管３との間にフレキシブルチューブなどの柔軟性のある部材を挟むようにすれば、流体供給管３全体のねじれを抑制し、カプラー１３等による接続部の微調整をしやすくする効果が期待できる。
また、上述したように、柔軟性のある部材を用いた場合には、移動規制部材１２は上杭側流体供給管３ａを周方向及び軸方向で移動規制するようにしてもよい。
また、流体供給管３は1本だけでなく複数本使用するケースもあるが、2本以上の場合は、流体供給管３の接続部（カプラー１３他）の高さをずらすようにしてもよい。高さをずらした場合は、流体供給管３を1本ずつ接続することができるので作業性が良い。
なお、図５では、ねじ継手１の接続後の配置関係を示している。 Furthermore, by sandwiching a flexible member such as a flexible tube between the coupler 13 etc. and the fluid supply pipe 3, it is possible to suppress twisting of the entire fluid supply pipe 3, and it is expected that this will make it easier to fine-tune the connection using the coupler 13 etc.
Furthermore, as described above, when a flexible member is used, the movement restricting member 12 may be configured to restrict the movement of the upper pile side fluid supply pipe 3a in the circumferential and axial directions.
In addition, there are cases where not only one fluid supply pipe 3 but also multiple pipes are used, and when two or more pipes are used, the heights of the connecting parts (coupler 13, etc.) of the fluid supply pipes 3 may be shifted. When the heights are shifted, the fluid supply pipes 3 can be connected one by one, which improves workability.
FIG. 5 shows the positional relationship after the threaded joint 1 is connected.

＜杭回転接合工程＞
杭回転接合工程は、上杭側流体供給管３ａの上部を上杭５ａに対して周方向の移動を規制した状態で上杭５ａを下杭５ｂに回転接合する工程である。
この工程では、上杭５ａを回転接合する回転方向（正回転方向）と逆方向に回転接合分だけ回転させた後、上杭５ａの継手部を下杭５ｂの継手部に芯合わせして当接させ（図１（ｃ）参照）、その後、上杭５ａを回転接合方向（正回転方向）に回転させる（図１（ｃ）→図１（ｄ））。
このような手順によるため、回転接合開始時に上杭側流体供給管３ａに生じた上杭５ａ内面に沿う撓みが、回転接合が進むにつれて解消するように回転接合が行われる。すなわち、上杭側流体供給管３ａは上杭５ａを回転接合する直前では、図１（ｃ）に示すように、全体がねじれているが、上杭５ａを回転することでねじれが徐々に解消され、ねじ継手１の回転接合が完了した状態では、上杭側流体供給管３ａと下杭側流体供給管３ｂはほぼ一直線の状態になる。 <Pile rotation joining process>
The pile rotation joining process is a process of rotationally joining the upper pile 5a to the lower pile 5b while restricting the circumferential movement of the upper part of the upper pile side fluid supply pipe 3a relative to the upper pile 5a.
In this process, the upper pile 5a is rotated in the direction opposite to the rotational direction (forward rotation direction) for rotary joining by the amount of rotary joining, and then the joint portion of the upper pile 5a is aligned and abutted against the joint portion of the lower pile 5b (see Figure 1(c)), and then the upper pile 5a is rotated in the rotary joining direction (forward rotation direction) (Figure 1(c) → Figure 1(d)).
Due to this procedure, the rotational joining is performed so that the deflection along the inner surface of the upper pile 5a that occurs in the upper pile side fluid supply pipe 3a at the start of the rotational joining is eliminated as the rotational joining proceeds. That is, the upper pile side fluid supply pipe 3a is twisted as a whole just before the upper pile 5a is rotationally joined, as shown in Figure 1 (c), but the twist is gradually eliminated by rotating the upper pile 5a, and when the rotational joining of the threaded joint 1 is completed, the upper pile side fluid supply pipe 3a and the lower pile side fluid supply pipe 3b become almost in a straight line.

上杭５ａを回転する方法としては、特に限定されるものではないが、回転バンド１４を使った人力による回転や、牽引工具を用いた回転、施工機械の回転機構を利用した回転などが想定できるが、現場の状況に応じて適切なものを選択すればよい。
本実施の形態では、上杭５ａは図３に示すように吊天秤７に吊られているので、簡単に回すことができる。
なお、接合完了後に逆回転を防止するためのピンを設置してもよい。 The method for rotating the upper pile 5a is not particularly limited, but possible methods include manual rotation using a rotating band 14, rotation using a towing tool, or rotation using the rotation mechanism of a construction machine, and the appropriate method can be selected depending on the conditions at the site.
In this embodiment, the upper pile 5a is suspended from a suspension balance 7 as shown in FIG. 3, and therefore can be easily rotated.
In addition, a pin may be provided to prevent reverse rotation after joining is completed.

ねじ継手１の回転接合が完了した状態において、流体供給管３の周方向の移動は移動規制部材１２によって規制されているので、杭貫入時に杭内に流入する土によって流体供給管３が移動するのを効果的に防止でき、杭貫入時の流体供給管３の変形や外れを防止することができる。 When the rotational joining of the threaded joint 1 is completed, the circumferential movement of the fluid supply pipe 3 is restricted by the movement restriction member 12, so that the fluid supply pipe 3 can be effectively prevented from moving due to the soil flowing into the pile when the pile is penetrated, and deformation or dislodgment of the fluid supply pipe 3 can be prevented when the pile is penetrated.

図７は、実施工の例を示す写真であり、図７（ａ）は、上杭側流体供給管３ａが移動規制部材１２に移動規制されている様子を示し、図７（ｂ）は２本の上杭側流体供給管３ａが上杭５ａに移動規制されている状態を示し、図７（ｃ）は回転接合工程の初期に上杭５ａを回転させることで上杭側流体供給管３ａがねじれる様子を示している。 Figure 7 shows photographs of an example of the actual construction, where Figure 7(a) shows the upper pile side fluid supply pipe 3a being restricted in movement by the movement restriction member 12, Figure 7(b) shows the state in which the two upper pile side fluid supply pipes 3a are restricted in movement to the upper pile 5a, and Figure 7(c) shows the upper pile side fluid supply pipes 3a being twisted by rotating the upper pile 5a at the beginning of the rotary joining process.

なお、上記の例は上杭側流体供給管３ａが仮り取付された上杭５ａを吊り支持するものであったが、上杭５ａを吊り支持した後で上杭側流体供給管３ａを上杭５ａ内に挿入するようにしてもよい。 In the above example, the upper pile 5a to which the upper pile side fluid supply pipe 3a is temporarily attached is suspended and supported, but the upper pile side fluid supply pipe 3a may be inserted into the upper pile 5a after the upper pile 5a is suspended and supported.

また、上記の説明は、上杭側流体供給管３ａの上部のみを移動規制部材１２によって移動を規制したものであった。杭長が短い場合はこれでよいが、杭長が長に場合には上杭側流体供給管３ａも長くなるため、回転接合完了時点において上杭側流体供給管３ａの下部も上杭５ａの内面に移動規制されるようにした方が好ましい。
しかし、上杭側流体供給管３ａの下部は接続される下杭側流体供給管３ｂとの距離が近いので、回転接合前に上杭５ａに対して移動規制すると回転接合ができなくなる。
そこで、回転接合完了前には移動規制されないが回転接合完了時点で移動規制されるような構造が必要となる。以下、この点について説明する。 In the above description, the movement of only the upper part of the upper pile side fluid supply pipe 3a is restricted by the movement restricting member 12. This is fine when the pile length is short, but when the pile length is long, the upper pile side fluid supply pipe 3a also becomes long, so it is preferable that the movement of the lower part of the upper pile side fluid supply pipe 3a is also restricted to the inner surface of the upper pile 5a at the time when the rotary joining is completed.
However, since the lower part of the upper pile side fluid supply pipe 3a is close to the connected lower pile side fluid supply pipe 3b, if the movement of the upper pile 5a is restricted before the rotary joining, the rotary joining will not be possible.
Therefore, a structure is required in which the movement is not restricted before the completion of the rotary joining, but is restricted at the time of the completion of the rotary joining. This point will be described below.

このような構造の例としては、図８（ａ）に示すように、平面視で直角三角形の２つの三角ブロック体１５ａを、各部材の直角を挟む辺部９ａを所定の間隔（流体供給管３の外径より少し大きい間隔）離して対向配置することで溝部１５ｂを形成して上杭５ａ内面に固定した係合部や、図８（ｂ）に示すように、三角ブロック体１５ａとＬ字片１５ｃを組み合わせたものであって、Ｌ字片１５ｃの開口側を上杭５ａの周方向の片側に向けて上杭５ａ内面に固定し、上杭５ａの内周面であってＬ字片１５ｃの開口側に三角ブロック体１５ａを固定した係合部が挙げられる。 Examples of such structures include an engagement part in which two triangular block bodies 15a, which form a right-angled triangle in plan view, are arranged facing each other with the sides 9a that sandwich the right angle of each member spaced apart at a specified distance (slightly larger than the outer diameter of the fluid supply pipe 3) to form a groove 15b and are fixed to the inner surface of the upper pile 5a, as shown in Figure 8(a); and an engagement part in which a triangular block body 15a is combined with an L-shaped piece 15c, as shown in Figure 8(b), with the opening side of the L-shaped piece 15c fixed to the inner surface of the upper pile 5a facing one side in the circumferential direction, and the triangular block body 15a is fixed to the opening side of the L-shaped piece 15c on the inner surface of the upper pile 5a.

係合部１５の上杭周方向の個数は、流体供給管３の本数に合わせて設定する。また、係合部１５の上杭軸方向の個数や設置位置は、上杭５ａの寸法（径や長さ）や、杭施工機の仕様に合わせて選択すればよい。もっとも、杭頭付近とねじ継手近傍などには、軸方向の間隔を狭くして複数個設けるようにしてもよい。 The number of engagement parts 15 in the circumferential direction of the upper pile is set according to the number of fluid supply pipes 3. The number of engagement parts 15 in the axial direction of the upper pile and their installation positions can be selected according to the dimensions (diameter and length) of the upper pile 5a and the specifications of the pile construction machine. However, multiple engagement parts may be provided with narrow axial spacing near the pile head and near the threaded joint.

なお、係合部１５は、上杭５ａの上部に設ける移動規制部１２と鋼管内面における周方向同位置に設けられている。
係合部１５を設けることで、杭回転接合工程の完了時に上杭側流体供給管３ａの下部が上杭５ａの下部内面に対して周方向の移動が規制される上杭側流体供給管下部周方向移動規制工程が加わることになる。 The engagement portion 15 is provided at the same circumferential position on the inner surface of the steel pipe as the movement restricting portion 12 provided on the upper part of the upper pile 5a.
By providing the engagement portion 15, a circumferential movement restriction process for the lower part of the upper pile side fluid supply pipe 3a is added, in which the circumferential movement of the lower part of the upper pile side fluid supply pipe 3a relative to the lower inner surface of the upper pile 5a is restricted upon completion of the pile rotary joining process.

図８においては、杭回転接合工程の終盤において上杭５ａが回転することで上杭側流体供給管３ａが上杭周方向に相対移動して係合部１５に係合する上杭側流体供給管下部周方向移動規制工程を図示している。
図８（ａ）の態様では、上杭側流体供給管３ａが径方向に相対移動することで係合部１５である三角ブロック体１５ａの傾斜面部を乗り越えて溝部１５ｂに挿入され係止される。
また、図８（ｂ）の態様では、上杭側流体供給管３ａが径方向に相対移動して係合部１５を構成する三角ブロック体１５ａの傾斜面部を乗り越えてＬ字片１５ｃと三角ブロック体１５ａで形成される溝部１５ｂに入って係止される。 Figure 8 shows a process of regulating the circumferential movement of the lower part of the upper pile side fluid supply pipe, in which the upper pile 5a rotates at the end of the pile rotation joining process, causing the upper pile side fluid supply pipe 3a to move relatively in the circumferential direction of the upper pile and engage with the engagement portion 15.
In the embodiment of FIG. 8(a), the upper pile side fluid supply pipe 3a moves radially relative to the engaging portion 15, and thus climbs over the inclined surface of the triangular block body 15a, and is inserted into the groove portion 15b and locked therein.
In addition, in the embodiment shown in Figure 8 (b), the upper pile side fluid supply pipe 3a moves relatively radially, overcomes the inclined surface portion of the triangular block body 15a that constitutes the engagement portion 15, and enters and engages in the groove portion 15b formed by the L-shaped piece 15c and the triangular block body 15a.

このように、上杭５ａの下部に係合部１５を設けることで、杭回転接合工程の終了時に上杭側流体供給管３ａの下部が上杭５ａの内周面に対して周方向の移動が規制されることになり、杭長が長い場合であっても、杭貫入時に杭内に流入する土によって流体供給管３が移動するのを効果的に防止でき、杭貫入時の流体供給管３の変形や外れを防止することができる。 In this way, by providing an engagement portion 15 at the bottom of the upper pile 5a, the circumferential movement of the bottom of the upper pile side fluid supply pipe 3a relative to the inner surface of the upper pile 5a is restricted at the end of the pile rotary joining process. Even if the pile length is long, the fluid supply pipe 3 can be effectively prevented from moving due to soil flowing into the pile when it is inserted, and deformation or detachment of the fluid supply pipe 3 when it is inserted can be prevented.

次に、鋼管杭の回転接合方法を実施したときの流体供給管３、上杭５ａの上部、上杭５ａの下部及び下杭５ｂの相対関係について、図８に示した係合部１５を上杭５ａの下部に設けた場合を例に挙げて、図９に基づいて説明する。
図９Ａは上杭５ａの上部を、図９Ｂは上杭５ａの下部を、図９Ｃは下杭５ｂを、それぞれ上からのぞき込んだ状態の内面を示している。
また、図中の（１）～（５）は、回転接合の進行する各段階の様子を示したものであり、（１）は流体供給管接合時、（２）はねじ継手接合準備（芯合わせ）、（３）及び（４）はねじ継手接合中、（５）はねじ継手接合完了の状態をそれぞれ示している。 Next, the relative relationship between the fluid supply pipe 3, the upper part of the upper pile 5a, the lower part of the upper pile 5a, and the lower pile 5b when the rotary joining method for steel pipe piles is performed will be explained based on Figure 9, using as an example the case where the engagement portion 15 shown in Figure 8 is provided at the lower part of the upper pile 5a.
9A shows the inner surface of the upper part of the upper pile 5a, FIG. 9B shows the inner surface of the lower part of the upper pile 5a, and FIG. 9C shows the inner surface of the lower pile 5b, each viewed from above.
In addition, (1) to (5) in the figure show the various stages of the rotary joining, where (1) shows the state when the fluid supply pipe is joined, (2) shows preparation for joining the threaded joint (alignment), (3) and (4) show the state in which the threaded joint is being joined, and (5) shows the state when the threaded joint is completed.

（１）流体供給管接合時
流体供給管接合時においては、上杭側流体供給管３ａの上部は、図９Ａ（１）移動規制部材１２によって周方向の移動が規制された状態になっている。
また、上杭側流体供給管３ａの下部は、図９Ｂ（１）に示すように、係合部１５から時計回り方向にずれた位置にある。
また、下杭側流体供給管３ｂはその上端部が上杭側流体供給管３ａの下端部と接合されているので、図９Ｃ（１）に示すように、上杭側流体供給管３ａの上部と平面視で同位置にある。 (1) When the fluid supply pipe is joined When the fluid supply pipe is joined, the upper part of the upper pile side fluid supply pipe 3a is in a state in which its circumferential movement is restricted by the movement restricting member 12 in FIG. 9A (1).
In addition, the lower portion of the upper pile side fluid supply pipe 3a is located at a position shifted in the clockwise direction from the engagement portion 15 as shown in FIG. 9B (1).
In addition, since the upper end of the lower pile side fluid supply pipe 3b is joined to the lower end of the upper pile side fluid supply pipe 3a, as shown in Figure 9C (1), it is in the same position as the upper part of the upper pile side fluid supply pipe 3a in a plan view.

（２）ねじ継手接合準備（芯合わせ）
ねじ継手接合準備（芯合わせ）においては、図９（１）の状態から回転接合方向と逆回転方向（反時計回り）に９０°回転する。
この状態は、上杭側流体供給管３ａの下端は下杭側流体供給管３ｂと接合され、上端部は上杭５ａと共に回転するため、上杭側流体供給管３ａはねじれた状態となる（図１（ｃ）、図７（ｃ）参照）。 (2) Preparation for threaded joint joining (alignment)
In preparation for joining the threaded joint (alignment of the center), the joint is rotated 90° in the direction opposite to the rotational joining direction (counterclockwise) from the state shown in FIG. 9(1).
In this state, the lower end of the upper pile side fluid supply pipe 3a is joined to the lower pile side fluid supply pipe 3b, and the upper end rotates together with the upper pile 5a, so that the upper pile side fluid supply pipe 3a is twisted (see Figures 1 (c) and 7 (c)).

（３）（４）ねじ継手接合中
ねじ継手接合中は、図９（２）の状態から回転接合方法（時計回り）に回転させている状態であり、図９（３）は図９（２）の状態から約４５°回転した状態である。図９Ｂ（３）に示すように、この状態では、係合部１５が上杭側流体供給管３ａの下端部に近づいている。
図９（４）は図９（３）の状態からさらに少しだけ時計回りに回転させた状態であり、図９Ｂ（４）に示すように、上杭側流体供給管３ａの下端部が係合部１５の傾斜面を登っている。 (3)(4) During threaded joint joining During threaded joint joining, the joint is rotated in the rotary joining method (clockwise) from the state shown in Fig. 9(2), and Fig. 9(3) is a state rotated about 45° from the state shown in Fig. 9(2). As shown in Fig. 9B(3), in this state, the engagement portion 15 approaches the lower end of the upper pile-side fluid supply pipe 3a.
Figure 9 (4) shows the state after being rotated slightly further clockwise from the state in Figure 9 (3), and as shown in Figure 9B (4), the lower end of the upper pile side fluid supply pipe 3a climbs the inclined surface of the engagement portion 15.

（５）ねじ継手接合完了
ねじ継手接合完了状態では、上杭５ａの回転方向の位置が図９（１）の流体供給管接合時の位置に戻っている。そして、上杭側流体供給管３ａの下端部は係合部１５の溝部１５ａに入り込んでいる。そして、この状態では、上杭側流体供給管３ａの上部、下部及び下杭側流体供給管３ｂは周方向の位置が同位置で一直線状になっている（図１（ｄ）参照）。
一連の流れの中で、図９（１）～図９（５）に示されるように、下杭５ｂは回転せず、また下杭５ｂと流体供給管３の相対位置は変わらない。 (5) Completion of threaded joint connection When the threaded joint connection is complete, the rotational position of the upper pile 5a returns to the position when the fluid supply pipe was connected in Fig. 9 (1). The lower end of the upper pile-side fluid supply pipe 3a enters the groove 15a of the engagement portion 15. In this state, the upper and lower parts of the upper pile-side fluid supply pipe 3a and the lower pile-side fluid supply pipe 3b are aligned in the same circumferential position (see Fig. 1 (d)).
In this series of steps, as shown in Figures 9(1) to 9(5), the lower pile 5b does not rotate, and the relative position between the lower pile 5b and the fluid supply pipe 3 does not change.

本実施の形態によれば、ねじ継手１で回転接合されると共に杭先端に流体を供給する流体供給管３を備えた鋼管杭において、上杭５ａと下杭５ｂの接合時に流体供給管３の接合と鋼管杭の回転接合を容易にかつ効率よく行うことができる。 According to this embodiment, in a steel pipe pile that is rotary joined with a screw joint 1 and has a fluid supply pipe 3 that supplies fluid to the tip of the pile, when joining the upper pile 5a and the lower pile 5b, the joining of the fluid supply pipe 3 and the rotary joining of the steel pipe pile can be performed easily and efficiently.

なお、上記の実施の形態の上杭５ａを吊り支持する工程においては、上杭側流体供給管３ａを上杭５ａに保持するための部材として三又部材９を用いた例を示したが、本発明はこれに限られるものではなく、上杭側流体供給管３ａが落下しないように保持できるものであればその形態は特に限定されない。 In the above embodiment, in the process of suspending and supporting the upper pile 5a, an example was shown in which a three-pronged member 9 was used as a member for holding the upper pile side fluid supply pipe 3a to the upper pile 5a, but the present invention is not limited to this, and the shape is not particularly limited as long as it can hold the upper pile side fluid supply pipe 3a so as not to fall.

上記の実施の形態は、杭を回転接合するための機構として、杭端部にねじ継手を用いたものを例示して説明したが、本発明はこれに限られるものではなく、接合時に回転を伴う継手部を用いるものであれば適用可能である。このような継手部の例としては、外側継手管に内側継手管を挿入完了位置まで挿入して、挿入完了状態で外側継手管又は内側継手管を所定角度回転することで両者が係合して回転接合されるものが挙げられる。 The above embodiment has been described as an example of a mechanism for rotary joining of piles using a threaded joint at the end of the pile, but the present invention is not limited to this and can be applied to any joint that rotates when joined. An example of such a joint is one in which the inner joint pipe is inserted into the outer joint pipe to the fully inserted position, and when the insertion is complete, the outer joint pipe or the inner joint pipe is rotated by a predetermined angle to engage with each other and form a rotary joint.

１ ねじ継手
３ 流体供給管
３ａ 上杭側流体供給管
３ｂ 下杭側流体供給管
５ 流体供給管付き鋼管杭
５ａ 上杭
５ｂ 下杭
７ 吊天秤
９ 三又部材
９ａ 辺部
９ｂ 長穴
１１ チェーン
１２ 移動規制部材
１２ａ ブロック体
１２ｂ 蓋部材
１３ カプラー
１４ 回転バンド
１５ 係合部
１５ａ 三角ブロック体
１５ｂ 溝部
１５ｃ Ｌ字片 REFERENCE SIGNS LIST 1 Threaded joint 3 Fluid supply pipe 3a Upper pile side fluid supply pipe 3b Lower pile side fluid supply pipe 5 Steel pipe pile with fluid supply pipe 5a Upper pile 5b Lower pile 7 Suspension balance 9 Triangular member 9a Side portion 9b Slotted hole 11 Chain 12 Movement restriction member 12a Block body 12b Lid member 13 Coupler 14 Rotating band 15 Engagement portion 15a Triangular block body 15b Groove portion 15c L-shaped piece

Claims (7)

回転接合されると共に杭軸方向に配設されて杭内面及び／または杭先端に流体を供給する流体供給管を備えた流体供給管付き鋼管杭の回転接合方法であって、
下杭側流体供給管が取り付けられて地盤に打設された下杭の上方に、上杭側流体供給管が内面側に保持された上杭を吊り支持する上杭吊り支持工程と、前記上杭側流体供給管を前記下杭側流体供給管に接続する流体供給管接続工程と、前記上杭側流体供給管の上部を前記上杭に対して周方向の移動を規制した状態で前記上杭を前記下杭に回転接合する杭回転接合工程と、を備え、
上杭吊り支持工程において、前記上杭側流体供給管はその上部が前記上杭の内面に対して周方向に移動しないように移動規制されており、前記杭回転接合工程においては、回転接合開始時に前記上杭側流体供給管に生じた前記上杭内面に沿う撓みが解消するように回転接合が行われることを特徴とする流体供給管付き鋼管杭の回転接合方法。 A method for rotary joining a steel pipe pile with a fluid supply pipe, which is rotary joined and arranged in the pile axial direction to supply a fluid to the inner surface and/or tip of the pile,
The method includes an upper pile suspending and supporting process for suspending and supporting an upper pile, with an upper pile fluid supply pipe held on its inner side, above a lower pile that has a lower pile fluid supply pipe attached and is driven into the ground; a fluid supply pipe connecting process for connecting the upper pile fluid supply pipe to the lower pile fluid supply pipe; and a pile rotation joining process for rotationally joining the upper pile to the lower pile while restricting the upper part of the upper pile fluid supply pipe from moving in the circumferential direction relative to the upper pile,
A rotary joining method for a steel pipe pile with a fluid supply pipe, characterized in that, in the upper pile hanging support process, the movement of the upper pile side fluid supply pipe is restricted so that its upper part does not move circumferentially relative to the inner surface of the upper pile, and in the pile rotary joining process, rotary joining is performed so as to eliminate the deflection along the inner surface of the upper pile that occurred in the upper pile side fluid supply pipe at the start of rotary joining. 前記上杭吊り支持工程において、前記上杭側流体供給管はその上部が前記上杭の内面に対して周方向及び径方向に移動せず、軸方向に移動可能なように移動規制されていることを特徴とする請求項１に記載の流体供給管付き鋼管杭の回転接合方法。 The rotary joining method for a steel pipe pile with a fluid supply pipe according to claim 1, characterized in that in the upper pile suspension support process, the upper part of the fluid supply pipe on the upper pile side is restricted from moving circumferentially and radially relative to the inner surface of the upper pile, but is allowed to move axially. 前記杭回転接合工程の完了時に前記上杭側流体供給管の下部が前記上杭の下部内面に対して周方向の移動が規制される上杭側流体供給管下部周方向移動規制工程をさらに備え、
該上杭側流体供給管下部周方向移動規制工程は、上杭内面に設けた係合部に前記上杭側流体供給管が係合することで、前記上杭側流体供給管の周方向移動が規制されることを特徴とする請求項１又は２に記載の流体供給管付き鋼管杭の回転接合方法。 Further provided is an upper pile side fluid supply pipe lower circumferential movement restriction process in which the lower part of the upper pile side fluid supply pipe is restricted from moving in the circumferential direction relative to the lower inner surface of the upper pile at the completion of the pile rotary joining process,
A rotary joining method for a steel pipe pile with a fluid supply pipe as described in claim 1 or 2, characterized in that the process of restricting the circumferential movement of the lower part of the upper pile side fluid supply pipe is characterized in that the upper pile side fluid supply pipe engages with an engagement portion provided on the inner surface of the upper pile, thereby restricting the circumferential movement of the upper pile side fluid supply pipe. 前記係合部は、杭軸方向に延びて前記上杭側流体供給管が挿入される溝部と、該溝部に向かって登り傾斜となる傾斜面部とを備えてなり、
上杭側流体供給管下部周方向移動規制工程は、前記上杭側流体供給管が径方向に移動することで前記傾斜面部を乗り越えて前記溝部に挿入されることを特徴とする請求項３に記載の流体供給管付き鋼管杭の回転接合方法。 The engagement portion includes a groove portion extending in the pile axial direction and into which the upper pile-side fluid supply pipe is inserted, and an inclined surface portion that slopes upward toward the groove portion;
The rotary joining method for a steel pipe pile with a fluid supply pipe as described in claim 3, characterized in that the process of restricting the circumferential movement of the lower part of the upper pile side fluid supply pipe is characterized in that the upper pile side fluid supply pipe moves radially to overcome the inclined surface portion and be inserted into the groove portion. 鋼管と、該鋼管の端部に設けられた継手部と、前記鋼管の管軸方向に配設されて鋼管内面及び／または鋼管先端に流体を供給する流体供給管を備えた流体供給管付き鋼管杭であって、
前記鋼管上部内面に設けられて前記流体供給管を周方向に移動しないように移動規制する移動規制部と、
前記鋼管下部内面に設けられて前記流体供給管に係合して該流体供給管の周方向の移動を規制する係合部と、を備え、
該係合部と前記移動規制部とは、鋼管内面における周方向同位置に設けられていることを特徴とする流体供給管付き鋼管杭。 A steel pipe pile with a fluid supply pipe, comprising a steel pipe, a joint portion provided at an end of the steel pipe, and a fluid supply pipe arranged in the pipe axial direction of the steel pipe to supply a fluid to the inner surface and/or the tip of the steel pipe,
A movement restricting portion provided on the inner surface of the upper portion of the steel pipe to restrict the movement of the fluid supply pipe so as not to move in the circumferential direction;
an engaging portion provided on the inner surface of the lower part of the steel pipe and engaging with the fluid supply pipe to restrict circumferential movement of the fluid supply pipe;
A steel pipe pile with a fluid supply pipe, characterized in that the engagement portion and the movement restricting portion are provided at the same circumferential position on the inner surface of the steel pipe. 前記移動規制部は、前記流体供給管を周方向及び径方向に移動せず、軸方向には移動可能なように移動規制することを特徴とする請求項５に記載の流体供給管付き鋼管杭。 The steel pipe pile with a fluid supply pipe according to claim 5, characterized in that the movement restriction section restricts the movement of the fluid supply pipe so that it cannot move in the circumferential and radial directions, but can move in the axial direction. 前記係合部は、杭軸方向に延びて前記流体供給管が挿入される溝部と、該溝部に向かって登り傾斜となる傾斜面部とを備えてなることを特徴とする請求項５又は６に記載の流体供給管付き鋼管杭。 The steel pipe pile with a fluid supply pipe according to claim 5 or 6, characterized in that the engagement portion comprises a groove portion extending in the pile axial direction and into which the fluid supply pipe is inserted, and an inclined surface portion that slopes upward toward the groove portion.
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