JP2023087741A - Rotational joint method for steel pipe pile with liquid supply pipe, and steel pipe pile with liquid supply pipe - Google Patents

Abstract

To provide a rotational joint method for a steel pipe pile with a liquid supply pipe provided with a liquid supply pipe supplying liquid to a pile inner surface and/or a pile tip, and the steel pipe pile with the liquid supply pipe as well as being rotationally joined.SOLUTION: A rotational joint method for a steel pipe pile with a liquid supply pipe according to the present invention is the rotational joint method for the steel pipe pile with the liquid supply pipe provided with a liquid supply pipe 3 supplying liquid to a pile inner surface and/or a pile tip, and the steel pipe pile with the liquid supply pipe as well as being rotationally joined, comprising: a step of suspendingly supporting, on a lower pile 5b on which a lower pile side liquid supply pipe 3b is attached and installed in the ground, an upper pile 5a on which an upper side liquid supply pipe 3a is temporarily attached; a liquid supply pipe joint step of joining the upper pile side liquid supply pipe 3a on the lower pile side liquid supply pipe 3b; a pile rotation joint step of rotationally joining the upper pile 5a on the lower pile 5b while holding the upper pile side liquid supply pipe 3a in a state not rotationally following the same; and an upper pile side liquid supply pipe circumferential direction movement limiting step of limiting movement of the upper pile side liquid supply pipe 3a with respect to an inner surface of the upper pile 5a in a state the upper pile 5a is joined to the lower pile 5b.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a rotational joining method for steel pipe piles that are rotationally joined, and in particular, rotation of a steel pipe pile with a fluid supply pipe provided with a fluid supply pipe that is arranged in the pile axis direction and supplies fluid to the inner surface of the pile and/or the tip of the pile. The present invention relates to a joining method and a steel pipe pile with a fluid supply pipe.

Welded joints are generally used to join steel pipe piles, but the number of cases where mechanical joints are used for joints is increasing, such as when fire cannot be used or when joining time needs to be shortened. One of such mechanical joints is a threaded joint (see Patent Document 1).

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 end to the bottom end of the steel pipe pile, and water, drilling fluid, air, etc. are supplied to the fluid supply pipe. Then, it is discharged from the lower end of the pile or the like (see Patent Documents 2 and 3).

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: Pipe fixation on the lower pile side)
If the steel pipe pile has joints (longitudinal joint welds on site or horizontal joint welds at the storage site), after positioning the upper pile, the fluid supply pipe at the joint position is connected via a member such as a socket or joint pipe ( connection), and then weld the upper and lower piles.

Patent No. 6575553 Patent No. 4242251 Japanese Patent Application Laid-Open No. 2018-123670 Patent No. 6354911

When driving a steel pipe pile while connecting piles, if the fluid supply pipe is placed inside the steel pipe pile, the fluid supply pipe cannot withstand the earth pressure that flows into the steel pipe during driving, and is damaged. There is a possibility that Therefore, it is necessary to fix the fluid supply pipe to the inner surface of the steel pipe pile before driving the steel pipe pile.
Also, when joining the upper pile to the driven lower pile, the fluid supply pipe on the side of the lower pile is inserted before joining the lower pile and the upper pile with the fluid supply pipe inserted into the upper pile. The upper end of the upper pile is joined to the lower end of the fluid supply pipe on the upper pile side, and then the lower pile and the upper pile are joined.

For this reason, when connecting the upper pile and the lower pile with a screw joint, if the upper pile is rotated while the fluid supply pipe to the upper pile is fixed, the fluid supply pipe will be twisted, so the upper pile cannot be rotationally connected. There was a problem.
Note that the above problem is not limited to those using a threaded joint as a mechanism for rotational joining. The same problem occurs in the case where the outer joint tube or the inner joint tube is rotated by a predetermined angle after the insertion is completed so that both are engaged and rotationally joined.

The present invention has been made to solve such problems, and is a steel pipe pile with a fluid supply pipe that is rotationally joined and has a fluid supply pipe that supplies fluid to the pile inner surface and / or the pile tip. To provide a rotary joining method for steel pipe piles with fluid supply pipes capable of rotary joining without generating twist.
Another object of the present invention is to provide a steel pipe pile with a fluid supply pipe that enables such rotary joining.

(1) A method for rotationally joining a steel pipe pile with a fluid supply pipe according to the present invention includes a fluid supply pipe that is rotationally joined and arranged in the pile axis direction to supply a fluid to the inner surface of the pile and/or the tip of the pile. A rotational joining method for a steel pipe pile with a fluid supply pipe,
A step of suspending and supporting the upper pile to which the upper pile side fluid supply pipe is temporarily attached above the lower pile driven into the ground with the lower pile side fluid supply pipe attached; A fluid supply pipe connecting step of connecting to the lower pile side fluid supply pipe, and a pile rotation joining step of holding the upper pile side fluid supply pipe in a state not following the rotation of the upper pile and rotationally joining the upper pile to the lower pile. an upper pile side fluid supply pipe circumferential movement restricting step of restricting the movement of the upper pile side fluid supply pipe in the circumferential direction with respect to the inner surface of the upper pile in a state where the upper pile is rotationally joined to the lower pile; It is characterized by having

(2) A method for rotationally joining a steel pipe pile with a fluid supply pipe provided with a fluid supply pipe that is rotationally joined and arranged in the pile axis direction to supply a fluid to the inner surface of the pile and/or the tip of the pile,
A step of suspending and supporting the upper pile above the lower pile driven into the ground with the lower pile side fluid supply pipe attached; inserting the upper pile side fluid supply pipe into the inside of the suspended and supported upper pile; A fluid supply pipe connecting step of connecting to the lower pile side fluid supply pipe, a pile rotation joining step of holding the upper pile side fluid supply pipe in a state not following the rotation of the upper pile and rotationally joining the upper pile to the lower pile; an upper pile-side fluid supply pipe circumferential movement restricting step of restricting circumferential movement of the upper pile-side fluid supply pipe with respect to the inner surface of the upper pile in a state where the upper pile is rotationally joined to the lower pile; It is characterized by having

(3) In addition, in the above (1) or (2), the upper pile side fluid supply pipe circumferential movement restricting step includes engaging portions provided on the inner surface of the upper pile side fluid supply pipe. is engaged when the pile rotational joining is completed, thereby restricting the circumferential movement of the upper pile-side fluid supply pipe.

(4) In addition, in the above (3), the engaging portion includes a groove portion extending in the pile axis direction and into which the upper pile side fluid supply pipe is inserted, and an upward slope toward the groove portion. and an inclined surface portion,
In the pile rotation joining step, the upper end of the upper pile side fluid supply pipe is held while allowing movement in the radial direction while restricting movement in the rotation direction,
The upper pile-side fluid supply pipe circumferential movement restricting step is characterized in that the upper pile-side fluid supply pipe is moved in the radial direction so as to overcome the inclined surface portion and be inserted into the groove portion.

(5) A steel pipe pile with a fluid supply pipe according to the present invention includes a steel pipe, a joint portion provided at the end of the steel pipe, and a steel pipe inner surface and / or a steel pipe tip disposed in the pipe axial direction of the steel pipe. A steel pipe pile with a fluid supply pipe that supplies a fluid,
An engaging portion provided on the inner surface of the steel pipe and engaged with the fluid supply pipe to restrict circumferential movement of the fluid supply pipe,
The engagement portion is provided at a position where the fluid supply pipe is engaged when the rotation fitting is completed when the steel pipes are rotationally joined.

(6) In addition, in the above (5), the engaging portion includes a groove portion extending in the pile axis direction and into which the upper pile side fluid supply pipe is inserted, and an upward slope toward the groove portion. and an inclined surface portion.

According to the present invention, in a steel pipe pile that is rotationally joined and has a fluid supply pipe that supplies a fluid to the tip of the pile, it is possible to easily rotationally join the upper pile and the lower pile without causing twisting in the fluid supply pipe. and efficiently.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of the construction procedure of the rotation joining method of the steel pipe pile with a fluid supply pipe which concerns on embodiment of this invention. It is explanatory drawing of the member used at the process of suspending and supporting the upper pile in embodiment. It is explanatory drawing of an example of the process of suspending and supporting the upper pile in embodiment. It is explanatory drawing of the installation method of the three-pronged member used at the process of suspending and supporting the upper pile in embodiment. FIG. 5 is an explanatory diagram of a connecting member used in a fluid supply pipe connecting step in the embodiment; It is explanatory drawing of the engaging part used by the upper pile side fluid supply pipe circumferential direction movement control process in embodiment. It is explanatory drawing of the relative relationship of the fluid supply pipe, an upper pile, and a lower pile in a pile rotation joining process and an upper pile side fluid supply pipe circumferential direction movement control process in embodiment. It is explanatory drawing of the other aspect of the member used for the process of suspending and supporting the upper pile of embodiment, Comprising: It is a figure which shows the state before screw joint. It is a figure explaining the principal part of the other aspect of the member used for the process of suspending and supporting the upper pile of embodiment (part 1). It is explanatory drawing of the other aspect of the member used for the process of suspending and supporting the upper pile of embodiment, Comprising: It is a figure which shows the state after screw connection. It is a figure explaining the principal part of the other aspect of the member used for the process of suspending and supporting the upper pile of embodiment (part 2).

In this embodiment, as a mechanism for rotationally joining piles, a case where a screw joint is used at the end of the pile will be described as an example.
As shown in FIG. 1, the present embodiment comprises a fluid supply pipe 3 that is rotationally joined by a threaded joint 1 and arranged in the pile axis direction to supply the fluid to the inner surface of the pile and/or the tip of the pile. A rotary joining method for a steel pipe pile 5 with a supply pipe, wherein the upper pile side fluid supply pipe 3a is temporarily attached above the lower pile 5b that is driven into the ground with the lower pile side fluid supply pipe 3b attached. A step of suspending and supporting the upper pile 5a (see FIG. 1(a)), and a fluid supply pipe connecting step of connecting the upper pile side fluid supply pipe 3a to the lower pile side fluid supply pipe 3b (see FIG. 1(b)). , a pile rotation joining step (see FIG. 1(c)) in which the upper pile side fluid supply pipe 3a is held in a state not following the rotation of the upper pile 5a and the upper pile 5a is rotationally joined to the lower pile 5b; is rotationally connected to the lower pile 5b, the upper pile-side fluid supply pipe 3a is restricted from moving in the circumferential direction with respect to the inner surface of the upper pile (Fig. 1 ( d) see).
Each step and equipment used in each step will be described below.
In the present invention, steel pipe piles with an outer diameter of about φ300 mm to φ2000 mm are targeted.

<Process of suspending and supporting the upper pile>
This step is a step of suspending and supporting the upper pile 5a to which the upper pile-side fluid supply pipe 3a is temporarily attached above the lower pile 5b to which the lower pile-side fluid supply pipe 3b is attached and driven into the ground. (See FIG. 1(a)).
Members for realizing this process include, for example, the suspension balance 7 (FIG. 2(a)) and the three-pronged member 9 (FIG. 2(b)) shown in FIG.

As shown in FIG. 3 , the suspension balance 7 suspends the upper pile 5 a having the threaded joint 1 at two locations, and the suspension balance 7 suspends the upper pile 5 a so that it can rotate together with the suspension balance 7 .
The three-pronged member 9 is a member for holding the upper pile-side fluid supply pipe 3a in the upper pile 5a independently of the upper pile 5a.

As shown in FIG. 2(b), the three-pronged member 9 has three side portions 9a arranged at intervals of 120 degrees, whose base ends are joined at the center, and the upper pile side is attached to the tip of each side portion 9a. An elongated hole 9b (see FIG. 4) is provided for inserting the fluid supply pipe 3a. By using the three-pronged member 9, the three upper pile-side fluid supply pipes 3a can be held.
The three-pronged member 9 is temporarily attached to the upper pile 5a (temporarily fixed with a detachable fixture) while the upper pile-side fluid supply pipe 3a is inserted into the long hole 9b and held, and as shown in FIG. It is suspended by a chain 11 or the like provided in the central portion of the suspension balance 7 shown in FIG.

By doing so, even if the suspension balance 7 rotates together with the upper pile 5a, the three-pronged member 9 does not rotate and can move independently of the upper pile 5a. Therefore, the upper pile-side fluid supply pipe 3a held by the three-prong member 9 is held without following the rotation of the upper pile 5a.
Since the elongated hole 9b provided in the three-pronged member 9 is long in the radial direction, the upper pile-side fluid supply pipe 3a inserted through the elongated hole 9b can move radially within the elongated hole 9b.

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. may be inserted into the

<Fluid supply pipe connection process>
The fluid supply pipe connecting step is a step of connecting the upper pile side fluid supply pipe 3a to the lower pile side fluid supply pipe 3b (see FIG. 1(b)).
The fluid supply pipe 3 near the joint portion of the threaded joint is directed toward the inner side of the steel pipe so as to avoid the threaded joint 1 as shown in FIG. Make a curved shape. 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 couplers 13, for example. The connecting member may be a socket, a joint pipe, or the like, in addition to the coupler 13 .
In addition, FIG. 5 shows the positional relationship after connection of the threaded joint 1 .

<Pile rotation joining process>
The pile rotational joining process is a process of holding the upper pile side fluid supply pipe 3a in a state not following the rotation of the upper pile 5a and rotationally joining the upper pile 5a to the lower pile 5b (see FIG. 1(c)).
The method of rotating the upper pile 5a is not particularly limited, but rotation by human power using the rotating band 14, rotation using a traction tool, rotation using the rotation mechanism of the construction machine, etc. can be assumed. However, an appropriate one should be selected according to the situation at the site.
In this embodiment, the upper pile 5a is suspended by the suspension balance 7 as shown in FIG. 3, so that it can be easily turned. Further, since the fluid supply pipe 3a is connected to the lower pile side fluid supply pipe 3b and held by the three-pronged member 9, it does not follow the rotation of the upper pile 5a.

<Upper pile side fluid supply pipe circumferential movement restriction process>
The upper pile-side fluid supply pipe circumferential movement restriction step restricts the upper pile-side fluid supply pipe 3a from moving in the circumferential direction with respect to the inner surface of the upper pile 5a while the upper pile 5a is rotationally joined to the lower pile 5b. (see FIG. 1(d)).
As one aspect of this process, the upper pile side fluid supply pipe 3a is engaged with the engaging portion 15 provided on the inner surface of the upper pile 5a when the pile rotation joining of the upper pile 5a is completed, so that the upper pile side fluid supply pipe There is an aspect in which the circumferential movement of 3a is restricted.

As an example of the engaging portion 15, as shown in FIG. 6(a), two block bodies 15a, which are right-angled triangles in plan view, are separated by a predetermined interval (fluid supply pipe 3 A gap slightly larger than the outer diameter of the block body 15a and the L-shaped piece 15c as shown in FIG. It is a combination, the opening side of the L-shaped piece 15c is directed to one side in the circumferential direction of the upper pile 5a and fixed to the inner surface of the upper pile 5a, and the inner peripheral surface of the upper pile 5a and the opening of the L-shaped piece 15c For example, a block body 15a is fixed on the side.
The number of engaging portions 15 in the circumferential direction of the upper pile is set according to the number of fluid supply pipes 3 . The number and installation position of the engaging portions 15 in the axial direction of the upper pile may be selected according to the dimensions (diameter and length) of the upper pile 5a and the specifications of the pile construction machine. However, it is also possible to provide a plurality of them in the vicinity of the pile head and in the vicinity of the threaded joint, etc., with narrower intervals in the axial direction.

6 shows how the fluid supply pipe 3 moves relative to the upper pile circumferential direction as the upper pile 5a rotates. In the embodiment of FIG. is inserted into the groove portion 15b over the inclined surface portion of the block body 15a, which is the engaging portion 15, and locked, and in the mode of FIG. It moves relatively in the radial direction, climbs over the inclined surface portion of the block body 15a constituting the engaging portion 15, enters the groove portion 15b formed by the L-shaped piece 15c and the block body 15a, and is locked.

When the rotational joining of the threaded joint 1 is completed and the movement of the fluid supply pipe 3 is restricted, the joining is completed.
A pin may be installed to prevent reverse rotation after completion of joining.
By restricting the movement of the fluid supply pipe 3 in the circumferential direction by the engaging portion 15, it is possible to effectively prevent the movement of the fluid supply pipe 3 due to the soil flowing into the pile when the pile is penetrated. Deformation and detachment of the fluid supply pipe 3 can be prevented.

The relative relationship between the fluid supply pipe 3, the upper pile 5a and the lower pile 5b in the above-described pile rotation joining step and upper pile side fluid supply pipe circumferential movement restricting step will be described with reference to FIG. 7A shows the inner surface of the upper pile 5a, and FIG. 7B shows the inner surface of the lower pile 5b.
In addition, the numbers attached to A and B in the figure indicate that the clockwise rotation of the upper pile 5a from the state before joining the threaded joint in FIG. It shows that the threaded joint is completed in (A-5).

When the upper pile 5a rotates clockwise from the state of FIG. 7(A-1), the fluid supply pipe 3 gradually approaches the engaging portion 15 (FIGS. 7(A-2) to 7(A-3)). When further rotated, the fluid supply pipe 3 rides on the inclined surface portion of the engaging portion 15 (FIG. 7 (A-4)) and then fits into the groove portion 15b of the engaging portion 15 (FIG. 7 (A-5). ). This restricts the movement of the fluid supply pipe 3 in the circumferential direction.
In a series of flows, as shown in FIGS. 7(B-1) to 7(B-5), the lower pile 5b does not rotate and the relative positions of the lower pile 5b and the fluid supply pipe 3 do not change. do not have.

As shown in FIG. 7A-4, when the fluid supply pipe 3 climbs over the inclined surface portion of the engaging portion 15, the fluid supply pipe 3 moves radially inward of the upper pile 5a. As shown in FIG. 4, the elongated hole 9b of the three-pronged member 9 holding the fluid supply pipe 3 extends radially to facilitate this movement. However, even if the elongated hole 9b is not allowed to move radially inward, the fluid supply pipe 3 has a certain length and can be bent. You can climb mountains.

According to this embodiment, in the steel pipe pile that is rotationally joined by the threaded joint 1 and has the fluid supply pipe 3 that supplies fluid to the tip of the pile, when the upper pile 5a and the lower pile 5b are joined, the fluid supply pipe 3 It is possible to easily and efficiently join joints of steel pipe piles and rotary joints of steel pipe piles.

In the process of suspending and supporting the upper pile 5a in the above embodiment, an example of using the three-pronged member 9 as a member for holding the fluid supply pipe 3 so as not to follow the rotation of the upper pile 5a is shown. However, the present invention is not limited to this, and other aspects will be described below.

<Other aspects>
As another embodiment, as shown in FIGS. 8 and 9, the upper pile-side fluid supply pipe 3a is fixed with a saddle band 19 inside a ring member 17 having a slightly smaller diameter than the inner diameter of the upper pile 5a, and the ring member 17 are placed on stoppers 21 installed at four positions on the inner peripheral surface of the upper pile 5a.

As shown in the partially enlarged view of FIG. 9, the stopper 21 includes a horizontal piece portion 21a on which the ring member 17 is placed by protruding radially inward from the inner peripheral surface of the upper pile 5a, and an upper end portion of the horizontal piece portion 21a. A vertical piece portion 21b is provided so as to stand up on the outer surface of the ring member 17 to restrict the radially inward movement of the ring member 17. As shown in FIG.
Four ball casters 23 are provided on the outer periphery of the ring member 17 as friction reducing members for reducing friction between the ring member 17 and the inner peripheral surface of the upper pile 5a. By providing the ball caster 23, it is possible to effectively prevent the ring member 17 from rotating following the upper pile 5a when the upper pile 5a rotates.

According to the other aspect described above, the ring member 17 holding the fluid supply pipe 3 is placed on the stopper 21, and the upper pile 5a is moved while the fluid supply pipe 3 is connected to the lower pile side fluid supply pipe 3b. If it rotates, the ring member 17 is only placed on the stopper 21 and does not follow the rotation of the upper pile 5a. Move away from the stopper 21. At this time, the upper pile-side fluid supply pipes 3a support each other via the ring member 17, thereby maintaining a position close to the inner peripheral surface of the upper pile 5a.
Then, when the connection of the threaded joint 1 is completed, the fluid supply pipe 3 is engaged with the engaging portion 15 as described in the above embodiment.

FIG. 8 shows the state of the threaded joint 1 before joining, and FIG. 10 shows the state of the threaded joint 1 after joining.
In the state shown in FIG. 10, the ring member 17 is separated from the stopper 21 and the fluid supply pipe 3 is engaged with the engaging portion 15. As shown in FIG.

As a member for holding the fluid supply pipe 3 to the ring member 17, a U-bolt 25 may be used as shown in FIG. When the U-shaped opening side of the U-bolt 25 is directed radially inward, the curved portion of the U-shape faces the inner surface of the steel pipe, and the effect of reducing friction with the inner surface of the steel pipe can be obtained without providing the ball caster 23 .

In the above embodiment, as a mechanism for rotationally joining piles, a threaded joint is used at the end of the pile. It is applicable if it uses a joint part with it. As an example of such a joint portion, the inner joint pipe is inserted into the outer joint pipe to the insertion completion position, and the outer joint pipe or the inner joint pipe is rotated by a predetermined angle in the insertion completion state so that the two are engaged. Those that are rotationally joined can be mentioned.

1 screw 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 trifurcated member 9a side portion 9b long hole 11 chain 13 Coupler 14 Rotating band 15 Engagement part 15a Block body 15b Groove part 15c L-shaped piece 17 Ring member 19 Saddle band 21 Stopper 21a Horizontal piece 21b Vertical piece 23 Ball caster 25 U-bolt

Claims (6)

A method for rotationally joining a steel pipe pile with a fluid supply pipe provided with a fluid supply pipe that is rotationally joined and arranged in the pile axial direction to supply a fluid to the inner surface of the pile and/or the tip of the pile,
A step of suspending and supporting the upper pile to which the upper pile side fluid supply pipe is temporarily attached above the lower pile driven into the ground with the lower pile side fluid supply pipe attached; A fluid supply pipe connecting step of connecting to the lower pile side fluid supply pipe, and a pile rotation joining step of holding the upper pile side fluid supply pipe in a state not following the rotation of the upper pile and rotationally joining the upper pile to the lower pile. an upper pile side fluid supply pipe circumferential movement restricting step of restricting the movement of the upper pile side fluid supply pipe in the circumferential direction with respect to the inner surface of the upper pile in a state where the upper pile is rotationally joined to the lower pile; A rotational joining method for a steel pipe pile with a fluid supply pipe, comprising: A method for rotationally joining a steel pipe pile with a fluid supply pipe provided with a fluid supply pipe that is rotationally joined and arranged in the pile axial direction to supply a fluid to the inner surface of the pile and/or the tip of the pile,
A step of suspending and supporting the upper pile above the lower pile driven into the ground with the lower pile side fluid supply pipe attached; inserting the upper pile side fluid supply pipe into the inside of the suspended and supported upper pile; A fluid supply pipe connecting step of connecting to the lower pile side fluid supply pipe, a pile rotation joining step of holding the upper pile side fluid supply pipe in a state not following the rotation of the upper pile and rotationally joining the upper pile to the lower pile; an upper pile-side fluid supply pipe circumferential movement restricting step of restricting circumferential movement of the upper pile-side fluid supply pipe with respect to the inner surface of the upper pile in a state where the upper pile is rotationally joined to the lower pile; A rotational joining method for a steel pipe pile with a fluid supply pipe, comprising: In the upper pile side fluid supply pipe circumferential movement restriction step, the upper pile side fluid supply pipe is engaged with an engaging portion provided on the inner surface of the upper pile when the pile rotation joint is completed, so that the upper pile side fluid supply pipe 3. The rotational joining method for steel pipe piles with fluid supply pipes according to claim 1 or 2, wherein the circumferential movement of the is restricted. The engaging portion includes a groove portion extending in the pile axis 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,
In the pile rotation joining step, the upper end of the upper pile side fluid supply pipe is held while allowing movement in the radial direction while restricting movement in the rotation direction,
4. The upper pile side fluid supply pipe circumferential movement restricting step is characterized in that the upper pile side fluid supply pipe is moved in the radial direction so that the upper pile side fluid supply pipe overcomes the inclined surface portion and is inserted into the groove portion. rotational joining method for steel pipe piles with fluid supply pipes. A steel pipe with a fluid supply pipe, comprising a steel pipe, a joint provided at the end of the steel pipe, and a fluid supply pipe arranged in the pipe axial direction of the steel pipe and supplying a fluid to the inner surface of the steel pipe and/or the tip of the steel pipe. a stake,
An engaging portion provided on the inner surface of the steel pipe and engaged with the fluid supply pipe to restrict circumferential movement of the fluid supply pipe,
A steel pipe pile with a fluid supply pipe, wherein the engaging portion is provided at a position where the fluid supply pipe is engaged when the steel pipes are rotationally joined and the fluid supply pipe is engaged when the rotational fitting is completed. A fifth aspect of the present invention, wherein the engaging portion includes a groove portion extending in the axial direction of the pile and into which the upper pile side fluid supply pipe is inserted, and an inclined surface portion that slopes upward toward the groove portion. A steel pipe pile with a fluid supply pipe according to .

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