JP2014062446A5

JP2014062446A5 -

Info

Publication number: JP2014062446A5
Application number: JP2013068225A
Authority: JP
Filing date: 2013-03-28
Publication date: 2015-06-11
Anticipated expiration: 2033-03-28

Description

この発明の節付き現場打ちコンクリート系杭の築造方法は、鋼管の一端にこの鋼管の外周面よりも外周側に一部分が突出した刃体を有する先端掘削刃が、取外しまたは前記鋼管の外周面よりも内周側に収納が可能に取り付けられた掘削刃取付け鋼管を準備する過程と、
前記掘削刃取付け鋼管を、前記先端掘削刃が下側となるように支持しかつ前記鋼管の外周面から前記一部分を突出させた状態で前記鋼管の中心軸回りに一定方向に回転させつつ押し下げることによって、前記先端掘削刃により下方に掘削しかつ前記鋼管の外周の土に螺旋状の溝を形成しながら地盤に挿入する過程と、
前記鋼管内にモルタルまたは生コンクリートまたはセメントミルクを充填する過程と、前記鋼管を引き上げて前記鋼管から前記先端掘削刃を分離させ、または前記鋼管を逆回転させて前記先端掘削刃を前記鋼管の外周面よりも内周側に収納し、前記鋼管を地盤から引き抜くことによって、前記鋼管の抜き跡となる杭孔および前記螺旋状の溝に前記鋼管内のモルタルまたは生コンクリートまたはセメントミルクを流し込む過程とを含む。 In the method for constructing a knotted concrete pile with a node according to the present invention, a tip excavating blade having a blade body partially protruding from the outer peripheral surface of the steel pipe at one end of the steel pipe is removed or from the outer peripheral surface of the steel pipe. A process of preparing a drilling blade mounting steel pipe attached to be able to be stored on the inner peripheral side,
Pushing down the steel pipe attached with the excavating blade while supporting the tip excavating blade to be on the lower side and rotating the steel pipe in a certain direction around the central axis of the steel pipe with the portion protruding from the outer peripheral surface of the steel pipe. The process of digging downward by the tip excavation blade and inserting it into the ground while forming a spiral groove in the outer periphery of the steel pipe,
Filling the steel pipe with mortar, ready-mixed concrete, or cement milk; pulling up the steel pipe to separate the tip excavating blade from the steel pipe; or rotating the steel pipe in reverse to place the tip excavating blade at the outer periphery of the steel pipe A process of pouring mortar, ready-mixed concrete, or cement milk in the steel pipe into the pile hole and the spiral groove that are extracted from the ground by storing the steel pipe from the ground, and storing the steel pipe from the ground. including.

この節付き現場打ちコンクリート系杭の築造方法は、上記掘削刃取付け鋼管を用いて杭孔を掘削することにより、杭孔の外周に螺旋状の溝が形成される。鋼管に対して先端掘削刃が取外し可能であり、鋼管を引き上げることにより、先端掘削刃は鋼管から分離して杭孔の底部に残される。または、鋼管に対して先端掘削刃が収納可能であり、鋼管を逆回転させることで前記先端掘削刃が前記鋼管の外周面よりも内周側に収納される。そのため、上記螺旋状の溝を壊さずに、鋼管のみを地盤から引き抜くことができる。このように形成された杭孔および螺旋状の溝にモルタルまたは生コンクリートまたはセメントミルクが流し込まれ、そのモルタルまたは生コンクリートまたはセメントミルクが硬化することで、螺旋状の節付きコンクリート系杭が現場打ちで築造される。 In this method of constructing a knotted concrete pile with a node, a spiral groove is formed on the outer periphery of the pile hole by excavating the pile hole using the excavating blade-attached steel pipe. The tip excavation blade can be removed from the steel pipe, and by pulling up the steel pipe, the tip excavation blade is separated from the steel pipe and left at the bottom of the pile hole. Alternatively, the tip excavating blade can be stored in the steel pipe, and the tip excavating blade is stored on the inner peripheral side of the outer peripheral surface of the steel pipe by rotating the steel pipe in the reverse direction. Therefore, it is possible to pull out only the steel pipe from the ground without breaking the spiral groove. Mortar or ready-mixed concrete or cement milk is poured into the pile holes and spiral grooves formed in this way, and the mortar or ready-mixed concrete or cement milk is hardened, so that the spiral knotted concrete piles are cast in the field. Built in.

この発明の第１の節付き現場打ちコンクリート系杭築造用の掘削刃取付け鋼管は、鋼管と、この鋼管の一端に取付部によって取り付けられて前記鋼管の外周面よりも外周側に一部分が突出した刃体を有する先端掘削刃とでなり、この先端掘削刃は、前記鋼管の地盤への挿入時に前記鋼管と共に回転することで地盤に螺旋状の溝を形成し、前記鋼管を地盤から引き上げることで前記先端掘削刃に作用する地盤の抵抗によって前記取付部で前記鋼管から外れるようになっている。
この構造であると、この発明の前記節付き現場打ちコンクリート系杭の築造方法に使用でき、この築造方法における杭孔および螺旋状の溝に鋼管内のモルタルまたは生コンクリートまたはセメントミルクを流し込む過程で鋼管を引き上げる際に、地盤の抵抗によって鋼管から先端掘削刃が外れるので、鋼管と先端掘削刃とを分離させる機構を別に設ける必要がない。そのため、節付き現場打ちコンクリート系杭築造用の掘削刃取付け鋼管を簡易な構成とすることができる。 A drilling blade mounting steel pipe for building a cast-in-place concrete pile with a first knot according to the present invention is a steel pipe, and is attached to one end of the steel pipe by a mounting portion, and a part protrudes to the outer peripheral side from the outer peripheral surface of the steel pipe. It consists of a tip excavating blade having a blade body, and this tip excavating blade forms a spiral groove in the ground by rotating together with the steel pipe when the steel pipe is inserted into the ground, and the steel pipe is pulled up from the ground. Due to the resistance of the ground acting on the tip excavation blade, the mounting portion is detached from the steel pipe.
With this structure, it can be used in the method for constructing the above-mentioned spot cast-in-place concrete pile according to the present invention, and in the process of pouring mortar, ready-mixed concrete or cement milk in a steel pipe into the pile hole and spiral groove in this construction method. When the steel pipe is pulled up, the tip excavation blade is detached from the steel pipe due to the resistance of the ground, so that it is not necessary to provide a separate mechanism for separating the steel pipe and the tip excavation blade. Therefore, it is possible to simplify the construction of the excavating blade-attached steel pipe for constructing a knotted concrete pile with a knot.

この発明の他の節付き現場打ちコンクリート系杭築造用の掘削刃取付け鋼管は、鋼管と、この鋼管の一端に取り付けられて前記鋼管の外周面よりも外周側に一部分が突出した状態と全体が前記鋼管の外周面よりも内周側に収納された状態とに姿勢変更可能な突没刃を有する先端掘削刃とを有し、この先端掘削刃は、前記鋼管の周方向に回動自在であって、前記鋼管の外周面よりも外周側に一部分が突出する状態から一方向への回動がストッパにより阻止されるものであり、前記鋼管と共に回転することで地盤に螺旋状の溝を形成する、この回動が阻止される方向は、鋼管を正回転させるとき、つまり鋼管の地盤への挿入時に回転させるときに、先端掘削刃が地盤の抵抗で回動しないように阻止させる方向とする。
この構造であると、この発明の前記節付き現場打ちコンクリート系杭の築造方法に使用でき、杭孔および螺旋状の溝に鋼管内のモルタルまたは生コンクリートまたはセメントミルクを流し込む前に、鋼管を逆回転させることで、地盤の抵抗によって先端掘削刃が鋼管の外周面よりも内周側に収納される。また、鋼管を正回転させて地盤へ挿入する時は、先端掘削刃が前記ストッパで回動阻止され、先端掘削刃が突出状態を維持する。そのため、先端掘削刃を鋼管に対して突出および収納させる駆動源や操作機構を別に設ける必要がない。そのため、節付き現場打ちコンクリート系杭築造用の掘削刃取付け鋼管を簡易な構成とすることができる。 A drilling blade mounting steel pipe for constructing other cast-in-place concrete piles with knots according to the present invention includes a steel pipe, a state in which a part of the steel pipe is attached to one end of the steel pipe and protrudes to the outer peripheral side of the outer peripheral surface of the steel pipe. A tip excavating blade having a projecting and retracting blade whose posture can be changed to a state accommodated on the inner peripheral side of the outer peripheral surface of the steel pipe, and the tip excavating blade is rotatable in a circumferential direction of the steel pipe. The stopper is prevented from rotating in one direction from a state in which a part protrudes to the outer peripheral side of the outer peripheral surface of the steel pipe , and a spiral groove is formed in the ground by rotating together with the steel pipe to, the direction of this rotation is prevented, when rotated forward steel pipe, that is, when rotating during insertion of the steel pipe into the ground, and the direction in which the tip excavating blade is prevented so as not to rotate in the resistance of the ground .
With this structure, it can be used in the method for constructing the above-mentioned spot cast-in-place concrete pile according to the present invention, and the steel pipe is reversed before pouring mortar, ready-mixed concrete or cement milk in the steel pipe into the pile hole and the spiral groove. By rotating, the tip excavation blade is accommodated on the inner peripheral side with respect to the outer peripheral surface of the steel pipe by the resistance of the ground. Further, when the steel pipe is rotated forward and inserted into the ground, the tip excavation blade is prevented from rotating by the stopper, and the tip excavation blade maintains the protruding state. Therefore, it is not necessary to separately provide a drive source and an operation mechanism for projecting and storing the tip excavation blade with respect to the steel pipe. Therefore, it is possible to simplify the construction of the excavating blade-attached steel pipe for constructing a knotted concrete pile with a knot.

この発明の節付き現場打ちコンクリート系杭の築造方法は、鋼管の一端にこの鋼管の外周面よりも外周側に一部分が突出した刃体を有する先端掘削刃が、取外しまたは前記鋼管の外周面よりも内周側に収納が可能に取り付けられた掘削刃取付け鋼管を準備する過程と、前記掘削刃取付け鋼管を、前記先端掘削刃が下側となるように支持しかつ前記鋼管の外周面から前記一部分を突出させた状態で前記鋼管の中心軸回りに一定方向に回転させつつ押し下げることによって、前記先端掘削刃により下方に掘削しかつ前記鋼管の外周の土に螺旋状の溝を形成しながら地盤に挿入する過程と、前記鋼管内にモルタルまたは生コンクリートまたはセメントミルクを充填する過程と、前記鋼管を引き上げて前記鋼管から前記先端掘削刃を分離させ、または前記鋼管を逆回転させて前記先端掘削刃を前記鋼管の外周面よりも内周側に収納し、前記鋼管を地盤から引き抜くことによって、前記鋼管の抜き跡となる杭孔および前記螺旋状の溝に前記鋼管内のモルタルまたは生コンクリートまたはセメントミルクを流し込む過程とを含むため、現場の土の状態に影響されることなく品質の安定した地盤補強用のコンクリート系杭を築造することができ、かつ築造されたコンクリート系杭の杭周面抵抗力が大きい。 In the method for constructing a knotted concrete pile with a node according to the present invention, a tip excavating blade having a blade body partially protruding from the outer peripheral surface of the steel pipe at one end of the steel pipe is removed or from the outer peripheral surface of the steel pipe. A process of preparing a drilling blade mounting steel pipe attached to be able to be stored on the inner peripheral side, and supporting the drilling blade mounting steel pipe so that the tip excavation blade is on the lower side and from the outer peripheral surface of the steel pipe The ground is excavated downward by the tip excavating blade and formed into a spiral groove in the outer periphery of the steel pipe by pushing down while rotating in a certain direction around the central axis of the steel pipe with a part protruding. Inserting into the steel pipe, filling the steel pipe with mortar or ready-mixed concrete or cement milk, pulling up the steel pipe and separating the tip excavation blade from the steel pipe, or The serial steel pipe is reversely rotated to accommodate the tip digging edge on the inner peripheral side than the outer peripheral surface of the steel pipe, by withdrawing the steel pipe from the ground, the pile hole and the spiral grooves as a punching mark of the steel pipe Including a process of pouring mortar, ready-mixed concrete, or cement milk into the steel pipe, so that it is possible to build a concrete-based pile for ground reinforcement with stable quality without being affected by the soil condition at the site, and The built-up concrete pile has high resistance to the surface of the pile.

この発明の第１の節付き現場打ちコンクリート系杭築造用の掘削刃取付け鋼管は、鋼管と、この鋼管の一端に取付部によって取り付けられて前記鋼管の外周面よりも外周側に一部分が突出した刃体を有する円板状の先端掘削刃とでなり、この先端掘削刃は、前記鋼管の地盤への挿入時に前記鋼管と共に回転することで地盤に螺旋状の溝を形成し、前記鋼管を地盤から引き抜くことで前記先端掘削刃に作用する地盤の抵抗によって前記取付部で前記鋼管から外れるため、鋼管と先端掘削刃とを分離させる機構を別に設ける必要がなく、簡易な構成とすることができる。 A drilling blade mounting steel pipe for building a cast-in-place concrete pile with a first knot according to the present invention is a steel pipe, and is attached to one end of the steel pipe by a mounting portion, and a part protrudes to the outer peripheral side from the outer peripheral surface of the steel pipe. A disc-shaped tip excavating blade having a blade body, and the tip excavating blade forms a spiral groove in the ground by rotating together with the steel pipe when the steel pipe is inserted into the ground, and the steel pipe is grounded Since it is detached from the steel pipe at the mounting portion due to the resistance of the ground acting on the tip excavation blade by pulling out from the pipe, it is not necessary to separately provide a mechanism for separating the steel pipe and the tip excavation blade, and a simple configuration can be achieved. .

この発明の他の節付き現場打ちコンクリート系杭築造用の掘削刃取付け鋼管は、鋼管と、この鋼管の一端に取り付けられて前記鋼管の外周面よりも外周側に一部分が突出した状態と全体が前記鋼管の外周面よりも内周側に収納された状態とに姿勢変更可能な突没刃を有する先端掘削刃とを有し、この先端掘削刃は、前記鋼管の周方向に回動自在であって前記鋼管に設けられたストッパにより、前記鋼管の外周面よりも外周側に一部分が突出する状態から一方向への回動が阻止されるものであり、前記鋼管と共に回転することで地盤に螺旋状の溝を形成するため、先端掘削刃を鋼管に対して突出および収納させる駆動源や操作機構を別に設ける必要がなく、簡易な構成とすることができる。 A drilling blade mounting steel pipe for constructing other cast-in-place concrete piles with knots according to the present invention includes a steel pipe, a state in which a part of the steel pipe is attached to one end of the steel pipe and protrudes to the outer peripheral side of the outer peripheral surface of the steel pipe. A tip excavating blade having a projecting and retracting blade whose posture can be changed to a state accommodated on the inner peripheral side of the outer peripheral surface of the steel pipe, and the tip excavating blade is rotatable in a circumferential direction of the steel pipe. The stopper provided in the steel pipe prevents rotation in one direction from a state in which a part protrudes to the outer peripheral side of the outer peripheral surface of the steel pipe. By rotating together with the steel pipe, Since the spiral groove is formed , it is not necessary to separately provide a drive source and an operation mechanism for projecting and storing the tip excavation blade with respect to the steel pipe, and a simple configuration can be achieved.

前記掘削刃取付け鋼管１０は、図３に示すように、鋼管１１と、この鋼管１１の下端に取り付けられた先端掘削刃１２とでなる。先端掘削刃１２は、図４のように、鋼管１１の下端開口を蓋する円板状の蓋部１２ａの下面に、複数個（図示例では２個）の刃体１２ｂを固定して設けたものである。各刃体１２ｂは、所定の掘削回転方向（Ａ方向）に回転するとき下端側が先行するように傾斜角度が付けられている。また、各刃体１２ｂの外径端部分１２ｂａは、蓋部１２ａよりも外周側に突出している。よって、鋼管１１の下端に先端掘削刃１２を取り付けると、図３のように、各刃体１２ｂの外径端部分１２ｂａが鋼管１１の外周面よりも外周側に突出した状態となる。 As shown in FIG. 3, the excavation blade mounting steel pipe 10 includes a steel pipe 11 and a tip excavation blade 12 attached to the lower end of the steel pipe 11. As shown in FIG. 4, the tip excavating blade 12 is provided with a plurality of (two in the illustrated example) blade bodies 12 b fixed to the lower surface of a disk-shaped lid portion 12 a that covers the lower end opening of the steel pipe 11. Is. Each blade body 12b is inclined so that the lower end is preceded when rotating in a predetermined excavation rotation direction (A direction). Further, the outer diameter end portion 12ba of each blade body 12b protrudes to the outer peripheral side from the lid portion 12a. Therefore, when the tip excavation blade 12 is attached to the lower end of the steel pipe 11, the outer diameter end portion 12ba of each blade body 12b protrudes to the outer peripheral side from the outer peripheral surface of the steel pipe 11 as shown in FIG.

この先端掘削刃３２は、具体的には、鋼管１１の下端開口を蓋する円板状の蓋部３２ａの下面に、正面形状が溝形の刃体である掘削刃本体３２ｂを設け、この掘削刃本体３２ｂの下面の両端に、他の刃体である一対の突没刃３２ｃをそれぞれ設けている。各突没刃３２ｃは、鋼管１１の軸心と平行な支軸３３によって、掘削刃本体３２ｂに対して鋼管１１の周方向に正逆両方向に回動自在に支持される。これら各突没刃３２ｃは、掘削刃本体３２ｂに設けられたストッパ３４により、鋼管１１の外周面よりも外周側に最も突出する姿勢で係止され、この姿勢から一方向への回動が阻止される。この回動が阻止される方向は、鋼管１１を正回転させるとき、つまり掘削刃取付け鋼管１０の地盤への挿入時に回転させるときに、先端掘削刃３２の各突没刃３２ｃが地盤の抵抗で回動しないように阻止される方向とする。 Specifically, the tip excavating blade 32 is provided with an excavating blade body 32b having a groove-shaped blade body on the lower surface of a disc-shaped lid portion 32a that covers the lower end opening of the steel pipe 11. A pair of projecting blades 32c, which are other blade bodies, are provided at both ends of the lower surface of the blade body 32b. Each projecting blade 32c is supported by a support shaft 33 parallel to the axis of the steel pipe 11 so as to be rotatable in both forward and reverse directions in the circumferential direction of the steel pipe 11 with respect to the excavating blade body 32b. Each of the projecting and retracting blades 32c is locked by a stopper 34 provided on the excavating blade main body 32b so as to protrude most outward from the outer peripheral surface of the steel pipe 11, and rotation in one direction from this posture is prevented. Is done. The direction in which this rotation is prevented, when rotated forward steel pipe 11, i.e. digging edge when rotating upon insertion into the ground of the mounting steel pipe 10, distal the protruding and retracting the blade 32c of the digging edge 3 2 the resistance of the ground It is set as the direction blocked | prevented so that it may not rotate by.

図９は、図７，図８の掘削刃取付け鋼管１０を用いる節付き現場打ちコンクリート系杭の築造方法を示す。この構築方法は、特に説明する事項の他は、図６と共に前述した構築方法と略同様である。
この方法では、図９（Ａ）のように、掘削刃取付け鋼管１０を地盤１５へ貫入させるときに、先端掘削刃３２は、突没刃３２ｃが図８のように突出状態であることが必要である。しかし、貫入開始前の突没刃３２ｃの姿勢に係わらず、突没刃３２ｃが地盤１５に接して掘削刃取付け鋼管１０が正方向に回転させられると、突没刃３２ｃは回転に対する地盤１５の反力で突出方向に回動し、図８のように最も突出した状態で、ストッパ３４で支持されて突出状態で維持される。そのため、突没刃３２ｃを突出させる作業や操作は特には不要である。 9, FIG. 7 shows a construction process of clause with poured concrete system piles using digging edge mounting steel pipe 10 of FIG. This construction method is substantially the same as the construction method described above with reference to FIG.
In this method, as shown in FIG. 9 (A), the excavating blade mounting steel pipe 10 when to penetrate into the ground 15, the tip digging edge 32 must be project and retract the blade 32c is protruded state as shown in FIG. 8 It is. However, regardless of the attitude of the submerged blade 32c before the start of penetration, when the submerged blade 32c is in contact with the ground 15 and the excavating blade mounting steel pipe 10 is rotated in the forward direction, the submerged blade 32c is rotated by the ground 15 against the rotation. It rotates in the protruding direction by the reaction force, and is supported by the stopper 34 in the protruding state as shown in FIG. Therefore, the work and operation for projecting the projecting and retracting blade 32c are not particularly required.

図９（Ｂ）のように掘削刃取付け鋼管１０の貫入が完了し、同図（C ）のようにモルタル充填を開始した後、同図（Ｄ）のように掘削刃取付け鋼管１０を引き上げるときに、掘削刃取付け鋼管１０を貫入時とは逆方向に回転させる。この逆回転により、先端掘削刃３２の突没刃３２ｃは、回転に対する地盤１５の反力により、図７のように突没刃３２ｃが鋼管１１の外周面よりも内周側に収納された状態となる。そのため、この実施形態においても、地盤１５に形成された螺旋状の溝１６を壊さずに、掘削刃取付け鋼管１０を地盤１５から引き抜くことができる。また、鋼管１１を正回転させて地盤１５へ挿入する時は、先端掘削刃３２が突出してストッパ３４で回動阻止され、先端掘削刃３３が突出状態を維持する。そのため、先端掘削刃３２を鋼管１１に対して突出および収納させる駆動源や操作機構を別に設ける必要がない。 When the penetration of the excavating blade mounting steel pipe 10 is completed as shown in FIG. 9 (B) and mortar filling is started as shown in FIG. 9 (C), and then the excavating blade mounting steel pipe 10 is pulled up as shown in FIG. 9 (D). to rotate in a direction opposite to the digging edge mounting steel pipe 10 at the time of penetration. By this reverse rotation, the projecting blade 32c of the tip excavating blade 32 is in a state in which the projecting blade 32c is housed on the inner peripheral side with respect to the outer peripheral surface of the steel pipe 11 as shown in FIG. It becomes. Therefore, also in this embodiment, the excavating blade mounting steel pipe 10 can be pulled out from the ground 15 without breaking the spiral groove 16 formed in the ground 15. Further, when the steel pipe 11 is rotated forward and inserted into the ground 15, the tip excavation blade 32 protrudes and is prevented from rotating by the stopper 34 , and the tip excavation blade 33 maintains the protruding state. Therefore, it is not necessary to separately provide a drive source and an operation mechanism for projecting and storing the tip excavation blade 32 with respect to the steel pipe 11.

Claims

Excavation blade attachment in which a tip excavation blade having a blade body partially protruding from the outer peripheral surface of the steel pipe is attached to one end of the steel pipe so that it can be removed or stored on the inner peripheral side of the outer peripheral surface of the steel pipe The process of preparing the steel pipe,
Pushing down the steel pipe attached with the excavating blade while supporting the tip excavating blade to be on the lower side and rotating the steel pipe in a certain direction around the central axis of the steel pipe with the portion protruding from the outer peripheral surface of the steel pipe. The process of digging downward by the tip excavation blade and inserting it into the ground while forming a spiral groove in the outer periphery of the steel pipe,
Filling the steel pipe with mortar, ready-mixed concrete, or cement milk; pulling up the steel pipe to separate the tip excavating blade from the steel pipe; or rotating the steel pipe in reverse to place the tip excavating blade at the outer periphery of the steel pipe A process of pouring mortar, ready-mixed concrete, or cement milk in the steel pipe into the pile hole and the spiral groove that are extracted from the ground by storing the steel pipe from the ground, and storing the steel pipe from the ground. ,
Method for construction of cast-in-place concrete piles with knots.

2. The method for constructing a cast-in-place concrete pile with a node according to claim 1, wherein vibration is applied to the steel pipe during a process of pouring mortar, ready-mixed concrete or cement milk in the steel pipe into the pile hole and a spiral groove. A method for building a cast-in-place concrete pile with a knot that compacts the mortar, ready-mixed concrete or cement milk.

A steel pipe and a tip excavating blade attached to one end of the steel pipe by a mounting portion and having a blade body partially projecting from the outer peripheral surface of the steel pipe. The tip excavating blade is connected to the ground of the steel pipe. A spiral groove is formed in the ground by rotating together with the steel pipe at the time of insertion, and the site with a node that is detached from the steel pipe at the mounting portion by the resistance of the ground acting on the tip excavating blade by pulling up the steel pipe from the ground Excavation blade mounting steel pipe for construction of cast concrete piles.

The posture can be changed between a steel pipe and a state where a part of the steel pipe is attached to one end of the steel pipe and protrudes to the outer peripheral side from the outer peripheral surface of the steel pipe and a state in which the whole is housed on the inner peripheral side of the outer peripheral surface of the steel pipe A tip excavating blade having a projecting blade, and the tip excavating blade is rotatable in the circumferential direction of the steel pipe and is unidirectional from a state in which a part projects outward from the outer peripheral surface of the steel pipe. An excavating blade-attached steel pipe for constructing a knotted cast-in-place concrete pile , in which a spiral groove is formed in the ground by rotating together with the steel pipe by being prevented by a stopper.

A cast-in-place concrete pile with a knot manufactured by the building method according to claim 1, which is a columnar shape made of mortar, concrete, or cement milk, and has a spiral protrusion that bites into the ground on the outer periphery. A cast-in-place concrete pile with a knot.