JP2007154456A - Structure for reinforcing pile head during construction of steel pipe pile, and construction method for steel pipe pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure for reinforcing a pile head during the construction of a steel pipe pile capable of reducing the degree of difficulty of working, and a construction method for the steel pipe pile. <P>SOLUTION: In the state of being inserted into the steel pipe pile 1, a reinforcing member 10 is formed in such a shape as to have a reinforcing disc 13 close to the inner peripheral surface of a steel pipe pile body 1A corresponding to a fixed position of an engaging piece 1C. Thus, the reinforcing member 10 can be manufactured by producing the reinforcing disk 13 through an easy cut process, in comparison with a reinforcing body employing a thick-walled pipe subjected to bending work, and the degree of the difficulty of the working and a working cost can be greatly reduced. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pile head reinforcing structure and a steel pipe pile construction method at the time of steel pipe pile construction, and more specifically, an engagement piece fixed to a pile head outer peripheral surface of the steel pipe pile, and a vertical slide and rotation on the pile driving machine. The present invention relates to a pile head reinforcement structure and a construction method for a steel pipe pile that is rotated and penetrates into the ground by engagement with a coupling provided on the ground.

2. Description of the Related Art Conventionally, a steel pipe pile rotating device that rotates a steel pipe pile through engagement with a coupling (rotating cap) and penetrates the ground is known (for example, see Patent Document 1).
The steel pipe pile rotating device described in Patent Document 1 is loosely fitted in a rotating cap having a locking groove that engages with a locking piece fixed to the pile head of the steel pipe pile, and in the head end portion of the steel pipe pile. And a rotational reinforcing body having a thick tube. In this rotating device, the steel pipe pile is rotated by the rotating cap, whereby the steel pipe pile is embedded in the ground by the rotational propulsion effect of the spiral blade provided at the tip of the pile, and the torque (torsional moment) by the rotating cap is large. Even if it becomes (for example, when the tip of the pile reaches a hard support layer or an intermediate layer), the thick pipe of the rotation reinforcing body abuts against the inner peripheral surface of the steel pipe pile so that the deformation of the pile head can be prevented. It has become.

Utility Model Registration No. 2572379

  However, in the rotating device described in Patent Document 1, since the rotation reinforcing body is formed by using a thick tube having an outer diameter slightly smaller than the inner diameter of the steel pipe pile, a wall is formed for each type of steel pipe pile. There is a problem that a thick tube must be manufactured, and its processing difficulty and processing cost are increased.

  The objective of this invention is providing the construction method of the pile head reinforcement structure at the time of the steel pipe pile construction which can reduce a process difficulty, and the steel pipe pile.

  The pile head reinforcement structure at the time of steel pipe pile construction according to claim 1 of the present invention is provided on the pile head outer peripheral surface of the steel pipe pile, and the pile driving machine that is vertically slidable and rotatable. A pile head reinforcement structure at the time of construction of a steel pipe pile in which a reinforcement member is temporarily installed to reinforce the pile head at the time of construction of a steel pipe pile that is rotated and penetrates into the ground by engagement with a coupling. The member has an outer dimension larger than the inner diameter of the steel pipe pile and a support part that can be placed on the pile head, and has an outer dimension coupled to the support part and smaller than the inner diameter of the steel pipe pile. A reinforcing portion that can be inserted into the steel pipe pile, and the reinforcing portion is inserted into the steel pipe pile, and the inner peripheral surface of the steel pipe pile corresponds to at least a fixed position of the engaging piece. Steel plate material extending close to the longitudinal direction of the steel pipe pile Characterized in that it is formed to have.

According to the above-described pile head reinforcing structure, the steel plate pile adjacent to the inner peripheral surface of the steel pipe pile corresponding to the fixed position of the engaging piece in the state of being inserted into the steel pipe pile has the reinforcing portion of the reinforcing member. Therefore, it is no longer necessary to bend the thick tube as in the case of the conventional rotational reinforcement body, and it is possible to produce the reinforcing member by producing the steel plate material of the reinforcing part by cutting processing that is easy to process, Processing difficulty and processing cost can be greatly reduced.
Here, the reinforcing portion of the reinforcing member is disposed close to the inner peripheral surface of the steel pipe pile corresponding to the engaging piece of the pile head to be deformed by the rotational torque of the coupling, and the pile head begins to deform. It only has to come into contact with the inner peripheral surface at the time to prevent deformation. Moreover, the support part and reinforcement part of a reinforcement member should just be connected with the connection part which consists of an appropriate board | plate material and a bar. In other words, since the stress at the time of preventing deformation of the pile head does not act on this connecting portion, it is not necessary to use a steel material having an excessive cross section like a conventional thick tube, and in this respect also the processing difficulty level And processing costs can be reduced.

Moreover, the pile head reinforcement structure at the time of the steel pipe pile construction of Claim 2 of this invention is the pile head reinforcement structure at the time of the steel pipe pile construction of Claim 1, The said reinforcement member and the said coupling can be attached or detached freely. It is characterized by comprising a connecting means for connecting to.
According to such a configuration, by connecting the reinforcing member and the coupling by the connecting means, when removing the coupling from the pile head after entering the steel pipe pile, the reinforcing member is removed from the pile head together with the coupling, Thereafter, the reinforcing member can be removed from the coupling. Therefore, even if the pile head is slightly deformed by the rotational torque of the coupling and abuts against the reinforcing portion of the reinforcing member, and it is difficult to remove the reinforcing member manually, Since the reinforcing member can be removed, workability can be further improved.

Furthermore, the pile head reinforcement structure at the time of steel pipe pile construction of Claim 3 of this invention is the pile head reinforcement structure at the time of steel pipe pile construction of Claim 2, The said connection means is a support part of the said reinforcement member. A locking portion that protrudes upward from the insertion hole, an insertion hole provided in the coupling, and a rod-like member that is inserted through the insertion hole and engages with the locking portion. It is characterized by that.
According to such a configuration, it is possible to easily connect the coupling and the reinforcing member by inserting the rod-like member into the coupling through the coupling insertion hole and engaging the engaging portion of the reinforcing member. In addition, the coupling and the reinforcing member can be easily disconnected by simply pulling out the rod-shaped member.

Moreover, the pile head reinforcement structure at the time of the steel pipe pile construction of Claim 4 of this invention is the pile head reinforcement structure at the time of the steel pipe pile construction in any one of Claims 1-3. The steel plate material forming the reinforcing portion is a disc having an outer diameter smaller than the inner diameter of the steel pipe pile by a predetermined dimension.
According to such a configuration, by forming the reinforcing portion of the reinforcing member using a steel plate material made of a disk, along the entire inner peripheral surface of the steel pipe pile that is to be deformed by the rotational torque of the coupling. Since the reinforcing portion can be positioned, deformation can be effectively prevented, and the setting direction does not have to be taken into account when setting the reinforcing member, so that workability can be improved.

  On the other hand, the construction method of the steel pipe pile according to claim 5 of the present invention includes an engagement piece fixed to a pile head outer peripheral surface of the steel pipe pile, and a coupling provided on the pile driving machine so as to be vertically slidable and rotatable. A steel pipe pile construction method for rotating the steel pipe pile and penetrating into the ground by engagement with a support portion having an outer dimension larger than the inner diameter of the steel pipe pile and capable of being placed on the pile head And a reinforcing portion that is connected to the support portion and has an outer dimension smaller than the inner diameter of the steel pipe pile and can be inserted into the steel pipe pile, and the longitudinal direction of the steel pipe pile in a state of being set on the pile head A reinforcing member having the steel plate material extending substantially orthogonal to the reinforcing member, the reinforcing member is inserted into the pile head, and the steel plate material of the reinforcing member is at least of the engagement piece. The reinforcing portion is brought close to the inner peripheral surface of the steel pipe pile corresponding to the fixed position. The steel pipe pile is inserted into the ground to a predetermined position by rotating the coupling and the coupling is engaged with an engaging piece, and the cup is removed at a predetermined time before the coupling is removed from the steel pipe pile. The ring and the reinforcing member are connected by a connecting means, and the connected reinforcing member is removed together with the coupling from the pile head of the steel pipe pile.

  According to the above construction method, similarly to the above-described pile head reinforcing structure, it is possible to greatly reduce the processing difficulty and processing cost of the reinforcing member. Furthermore, by removing the reinforcing member from the pile head together with the coupling, it is not necessary to manually remove the reinforcing member, and the workability during construction can be further improved.

  According to the pile head reinforcement structure and the steel pipe pile construction method of the present invention as described above, the labor and cost of the reinforcing member can be reduced and the workability at the time of steel pipe pile construction can be improved. Can do.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a pile head reinforcing structure of a steel pipe pile 1 according to an embodiment of the present invention. FIG. 2 is a perspective view showing the reinforcing member 10 used in the pile head reinforcing structure. FIG. 3 is a cross-sectional view showing the pile head with the reinforcing member 10 set. FIG. 4 is a cross-sectional view showing the pile head with the coupling set.
1 to 4, a steel pipe pile 1 includes a steel pipe pile main body 1A formed of a circular steel pipe, a spiral blade 1B fixed to the tip (lower end) of the steel pipe pile main body 1A, and an outer periphery of the pile head. It has two engaging pieces 1C fixed to the surface. And the steel pipe pile 1 is rotated when the coupling 2 provided in the pile driving machine M (FIG. 5) so as to slide up and down and engage with the engaging piece 1C, and the blade 1B is screwed into the ground G. At the same time, it is pressed downward by the coupling 2 and penetrates into the ground (rotational press-fit). This coupling 2 has a substantially cylindrical coupling body 2A that opens downward and has an inner diameter slightly larger than the outer diameter of the steel pipe pile 1, and there are engagements at two locations on the side surface of the coupling body 2A. An engagement hole 2B that engages with the joint piece 1C and an insertion hole 2C for inserting a connecting rod 3 described later are provided.

At the time of such penetration of the steel pipe pile 1 (during construction), the pile head of the steel pipe pile 1 is prevented from being deformed by torque (rotational moment) acting on the steel pipe pile body 1A from the coupling 2. A reinforcing member 10 for reinforcement is temporarily installed.
As shown in FIGS. 2 and 3, the reinforcing member 10 has a support disk 11 as a support portion that has an outer dimension larger than the inner diameter of the steel pipe pile main body 1A and can be placed on the pile head, and this support. The connecting plate 12 as a connecting portion fixed to the lower surface of the disc 11 and the outer diameter of the connecting plate 12 connected to the lower end of the connecting plate 12 and smaller than the inner diameter of the steel pipe pile main body 1A are inserted into the steel pipe pile main body 1A. A reinforcing disc 13 as a possible reinforcing portion and a locking plate 14 as a locking portion formed to protrude upward from the upper surface of the support disc 11 are configured. The support disk 11, the connecting plate 12, the reinforcing disk 13, and the locking plate 14 are each formed by cutting from a steel plate material, and are integrated with each other by welding.

The reinforcing disk 13 of the reinforcing member 10 is close to the inner peripheral surface of the steel pipe pile 1 corresponding to the fixed position of the engaging piece 1C in the state inserted in the steel pipe pile main body 1A, that is, as shown in FIG. The reinforcing disc 13 is positioned within the range of the height dimension H of the engaging piece 1C, and the inner peripheral surface of the steel pipe pile 1 and the outer peripheral edge of the reinforcing disc 13 have a predetermined gap size (for example, 2 to 5 mm). ). And the reinforcement disc 13 is extended substantially orthogonally to the longitudinal direction (up-down direction) of the steel pipe pile 1, ie, in the state inserted in the steel pipe pile 1, it is located substantially horizontal.
Such a reinforcing disc 13 has a steel pipe pile main body 1A when the torque from the coupling 2 acts on the pile head of the steel pipe pile 1 via the engaging piece 1C and the steel pipe pile main body 1A is about to deform. The steel pipe pile main body 1A can be prevented from being deformed by contacting the inner peripheral surface of the steel pipe and supporting the load from the inside.

  The engaging plate 14 of the reinforcing member 10 is provided with an insertion hole 14A. The insertion hole 14A sets the reinforcing member 10 on the pile head of the steel pipe pile 1 and performs coupling as shown in FIG. In a state where 2 is engaged with the engaging piece 1C, the coupling piece 2 is formed so as to be substantially at the same height as the insertion hole 2C of the coupling 2. Then, the connecting rod 3 as a rod-shaped member is inserted into the insertion hole 2C of the coupling 2 and the insertion hole 14A of the reinforcing member 10, and the coupling 2 and the reinforcing member 10 are inserted by inserting the connecting rod 3. It is designed to be connected. That is, the connecting means of the present invention is constituted by the insertion holes 2C, 14A and the connecting rod 3. On the other hand, when the connecting rod 3 is removed from the insertion holes 2C and 14A, the coupling between the coupling 2 and the reinforcing member 10 is released.

Next, the construction method of the steel pipe pile 1 will be described with reference to FIGS.
5A to 5H are diagrams for explaining the construction procedure of the steel pipe pile 1. FIG. 6 is a flowchart for explaining the construction procedure of the steel pipe pile 1.
Here, the steel pipe pile 1 will be described in which two pieces (bottom pile and upper pile) are connected and integrated, but the steel pipe pile 1 is composed of one piece, or three or more pieces are connected. Even a thing will repeat substantially the same procedure as a construction method.

First, in step 1 of FIG. 6 (hereinafter, step is expressed as S. S1), after confirming the pile core, the reinforcing member 10 is set on the pile head of the steel pipe pile 1 which is the lower pile as shown in FIG. (S2).
Next, the pile driver M is used to set the lower pile as shown in FIG. 5 (A) and the coupling 2 to the pile head of the steel pipe pile 1 as shown in FIG. 5 (B), as shown in FIG. The engagement hole 2B is engaged with the engagement piece 1C (lower pile erection S3).
Next, as shown in FIG. 5 (C), the coupling 2 is rotated and pushed down by the pile driving machine M, and the blade 1B is screwed into the ground G to penetrate the steel pipe pile 1 into the ground G (rotational press-fitting S4). ). And in the state which the pile head of the steel pipe pile 1 fell to the position where the worker of the ground surface can work as shown in FIG.5 (D), the connecting rod 3 is inserted from the insertion hole 2C of the coupling 2, The coupling 2 and the reinforcing member 10 are connected by inserting the connecting rod 3 into the insertion hole 14 </ b> A of the reinforcing member 10. After coupling the coupling 2 and the reinforcing member 10 in this manner, the coupling 2 is pulled up by the pile driving machine M, and the reinforcing member 10 is removed from the pile head together with the coupling 2.
The construction of the lower pile is completed by the above steps.

Next, the reinforcing member 10 is set on the pile head of the steel pipe pile 1 which is the upper pile (S5), the upper pile is lifted by the pile driving machine M, and the engagement hole 2B of the coupling 2 is engaged with the engagement piece 1C. Combine the upper piles (S6). And as shown in FIG.5 (E), the upper end edge of a lower pile and the lower end edge of an upper pile are welded (S7), and this welded part is externally inspected (S8). Is completed.
Next, as shown in FIG. 5 (F), the upper and lower piles integrated by rotating the coupling 2 by the pile driving machine M and pushing down the lower pile and screwing the blade 1B of the lower pile into the ground G It penetrates into G (rotary press fit S9). And in the state which the pile head of the upper pile fell to near the ground surface, the coupling rod 3 is inserted from the insertion hole 2C of the coupling 2, and the coupling rod 3 is inserted into the insertion hole 14A of the reinforcing member 10, thereby The ring 2 and the reinforcing member 10 are connected.
After coupling the coupling 2 and the reinforcing member 10 in this way, as shown in FIG. 5 (G), the tip of the lower pile reaches the support layer, and the pile head of the upper pile reaches a predetermined depth from the ground surface. The rotary press-fitting is continued until the position is reached (stopping confirmation S10).
After confirming the stop position, the coupling 2 is pulled up by the pile driving machine M, the reinforcing member 10 is removed from the pile head together with the coupling 2, and the soil is backfilled on the upper side of the upper pile (S11). .

According to this embodiment, there are the following effects.
(1) That is, in the state inserted in the steel pipe pile 1, the reinforcing member 10 is formed having the reinforcing disc 13 close to the inner peripheral surface of the steel pipe pile main body 1A corresponding to the fixing position of the engaging piece 1C. Therefore, it is not necessary to bend the thick tube as in the case of the conventional rotational reinforcement body, and the reinforcing member 10 can be manufactured by producing the reinforcing disk 13 by the cutting process that is easy to process. The degree and processing cost can be greatly reduced.

(2) Furthermore, since the support disk 11 and the reinforcing disk 13 of the reinforcing member 10 are connected by the connecting plate 12, the processing difficulty level and the processing cost are also reduced in this respect, and the weight of the reinforcing member 10 is reduced. can do.

(3) Moreover, the reinforcing member 10 and the coupling 2 are connected by the connecting rod 3, so that the reinforcing member 10 can be removed from the pile head together with the coupling 2 after the steel pipe pile 1 has penetrated. Therefore, even if the pile head is slightly deformed by the rotational torque of the coupling 2 and abuts against the reinforcing disk 13 of the reinforcing member 10 and it is difficult to remove the reinforcing member 10 manually, the pile driving machine M The reinforcing member 10 can be removed with the coupling pulling force by the above, and the workability can be further improved.

(4) Furthermore, by configuring the connecting means using the connecting rod 3, the connecting rod 3 is inserted into the coupling 2 from the insertion hole 2C of the coupling 2, and is inserted into the insertion hole 14A of the reinforcing member 10. Thus, the coupling 2 and the reinforcing member 10 can be easily connected, and the reinforcing member 10 can be easily detached from the coupling 2 simply by pulling out the connecting rod 3.

In addition, this invention is not limited to the said embodiment, Including other structures etc. which can achieve the objective of this invention, the deformation | transformation etc. which are shown below are also contained in this invention.
For example, in the above-described embodiment, the reinforcing member 10 is formed with the single reinforcing disk 13 corresponding to the fixed position of the engaging piece 1C. However, the present invention is not limited to this, as shown in FIG. Alternatively, a reinforcing member 10A having a plurality of reinforcing disks (reinforcing portions) may be used. That is, in FIG. 7, the reinforcing member 10A includes a supporting disk 11, a connecting plate 12A fixed to the lower surface of the supporting disk 11, a reinforcing disk 13A connected to the lower end of the connecting plate 12A, The connecting plate 12B is fixed to the lower surface of the reinforcing disc 13A, and the reinforcing disc 13B is connected to the lower end of the connecting plate 12B. And in the state inserted in the steel pipe pile 1, upper reinforcement disc 13A adjoins to the inner peripheral surface of steel pipe pile 1 corresponding to the fixed position of engagement piece 1C, and lower reinforcement disc 13B is: It arrange | positions close to the internal peripheral surface of the steel pipe pile 1 below the fixing position of the engagement piece 1C.

Moreover, in the said embodiment, although the reinforcement disc 13 was used as a reinforcement part of the reinforcement member 10, the form of a reinforcement part is not restricted to a circular slope, The some contact part close | similar to the internal peripheral surface of the steel pipe pile 1 is provided. It may be formed in a polygonal shape, or may be formed with irregularities on the outer peripheral surface.
Furthermore, in the said embodiment, although the support disk 11 which consists of a steel plate was used as a support part of the reinforcement member 10, the form of a support part is not limited to a circular slope, but is stably mounted in the upper end edge of the steel pipe pile 1. FIG. The shape is not particularly limited as long as it is a form. That is, the support portion of the reinforcing member 10 may be formed of a rod-like member, and is configured such that a hook-shaped locking claw or the like formed on the upper end portion of the connecting plate 12 is caught on the upper end edge of the steel pipe pile 1. It may be a thing.
The connecting portion of the reinforcing member 10 is not limited to the connecting plate 12 made of a steel plate, but may be formed from a bar material such as a steel bar.

Moreover, in the said embodiment, although it was set as the construction procedure which sets the reinforcement member 10 at the time of construction of a lower pile or an upper pile at the time of construction of the steel pipe pile 1, not only this but the blade | wing 1B of the steel pipe pile 1 front-end | tip When reaching the intermediate layer or support layer of the ground, the coupling 2 may be pulled up and the reinforcing member 10 may be set. Furthermore, when the presence of a solid intermediate layer or the like has not been confirmed by a preliminary ground survey, the lower pile may be rotationally press-fitted without setting the reinforcing member 10.
Furthermore, the timing for inserting the connecting rod 3 for connecting the coupling 2 and the reinforcing member 10 is not particularly limited as long as it is before the coupling 2 is pulled up.

In addition, the best configuration, method and the like for carrying out the present invention have been disclosed in the above description, but the present invention is not limited to this. That is, the invention has been illustrated and described with particular reference to certain specific embodiments, but without departing from the spirit and scope of the invention, Various modifications can be made by those skilled in the art in terms of material, quantity, and other detailed configurations.
Therefore, the description limiting the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such restrictions is included in this invention.

It is a perspective view which shows the pile head reinforcement structure of the steel pipe pile which concerns on embodiment of this invention. It is a perspective view which shows the reinforcement member used for a pile head reinforcement structure. It is sectional drawing which shows the pile head in the state which set the said reinforcement member. It is sectional drawing which shows the pile head in the state which set the coupling. (A)-(H) is a figure explaining the construction procedure of a steel pipe pile. It is a flowchart explaining the construction procedure of the steel pipe pile 1. FIG. It is sectional drawing which shows the reinforcement member which concerns on the modification of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Steel pipe pile, 1C ... Engagement piece, 2 ... Coupling, 2C ... Insertion hole, 3 ... Connecting rod which is a rod-shaped member, 10 ... Reinforcement member, 11 ... Support circular slope which is a support part, 13, 13A, 13B A reinforcing circular slope as a reinforcing part, 14 a locking plate as a locking part, G a ground, M a pile driving machine.

Claims (5)

Construction of a steel pipe pile that is rotated and penetrates into the ground by engagement of an engagement piece fixed to the outer peripheral surface of the pile head of the steel pipe pile and a coupling provided on the pile driving machine so as to slide up and down and rotate freely At the time, it is a pile head reinforcement structure at the time of steel pipe pile construction that temporarily reinforces the pile head with a reinforcing member,
The reinforcing member has an outer dimension larger than the inner diameter of the steel pipe pile and can be placed on the pile head, and has an outer dimension coupled to the support and smaller than the inner diameter of the steel pipe pile. And a reinforcing portion that can be inserted into the steel pipe pile,
The reinforcing portion, when inserted in the steel pipe pile, extends close to the inner peripheral surface of the steel pipe pile corresponding to at least the fixing position of the engagement piece and extends substantially orthogonal to the longitudinal direction of the steel pipe pile. Pile head reinforcement structure at the time of steel pipe pile construction characterized by having steel plate material. In the pile head reinforcement structure at the time of steel pipe pile construction according to claim 1,
A pile head reinforcing structure during construction of a steel pipe pile, comprising a connecting means for detachably connecting the reinforcing member and the coupling. In the pile head reinforcement structure at the time of steel pipe pile construction according to claim 2,
The connecting means includes a locking portion that protrudes upward from a support portion of the reinforcing member, an insertion hole provided in the coupling, and is inserted through the insertion hole and engages with the locking portion. The pile head reinforcement structure at the time of steel pipe pile construction characterized by having a rod-shaped member. In the pile head reinforcement structure at the time of steel pipe pile construction in any one of Claims 1-3,
A pile head reinforcing structure during construction of a steel pipe pile, wherein the steel plate material forming the reinforcing portion of the reinforcing member is a disk having an outer diameter smaller than the inner diameter of the steel pipe pile by a predetermined dimension. A steel pipe pile that penetrates into the ground by rotating the steel pipe pile by engaging with an engagement piece fixed to the outer peripheral surface of the pile head of the steel pipe pile and a coupling that is vertically slidable and rotatable on the pile driving machine The construction method of
A support part having an outer dimension larger than the inner diameter of the steel pipe pile and capable of being placed on the pile head, and an outer dimension coupled to the support part and smaller than the inner diameter of the steel pipe pile, And a reinforcing member in which the reinforcing part is formed with a steel plate material extending substantially perpendicular to the longitudinal direction of the steel pipe pile in a state set in the pile head.
The reinforcing part is inserted into the pile head, the steel plate material of the reinforcing part is set close to the inner peripheral surface of the steel pipe pile corresponding to the fixed position of the engaging piece, and the reinforcing member is set.
The steel pipe pile penetrates into the ground to a predetermined position by rotating the coupling by engaging the coupling with an engagement piece,
The coupling and the reinforcing member are connected by connecting means at a predetermined time before the coupling is removed from the steel pipe pile, and the connected reinforcing member is removed from the pile head of the steel pipe pile together with the coupling. Steel pipe pile construction method characterized by

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