JP2022096735A - Steel pipe pile, construction method of the steel pipe pile, design method of the steel pipe pile, and manufacturing method of the steel pipe pile - Google Patents

Abstract

To obtain a steel pipe pile capable of easily arranging liquid supply pipes, preventing liquid supply pipes from receiving strong reaction force from a ground in rotationally pressing-in, and suppressing clogging inside a steel pipe, a construction method of the steel pipe pile, a design method of the steel pipe pile, and a manufacturing method of the steel pipe pile .SOLUTION: A steel pipe pile 1 rotationally pressed into a ground comprises: a spiral holding member 5 protruding to a tip inner face side of a steel pipe 3 constituting the steel pipe pile 1 and provided in a continuous or intermittent spiral shape; one or more liquid supply pipes 7 downwardly arranged downwardly along an inner wall of the steel pipe 3 from an upper end of the steel pipe 3 to supply liquid; and a liquid discharge pipe 9 connected to a lower end portion of the liquid supply pipe 7, arranged along an upper face of the spiral holding member 5, and formed with a liquid discharge port 9a discharging liquid to a peripheral surface.SELECTED DRAWING: Figure 1

Description

The present invention relates to a steel pipe pile that is rotationally press-fitted into the ground, a method for constructing the steel pipe pile, a method for designing the steel pipe pile, and a method for manufacturing the steel pipe pile.

When the steel pipe pile is rotationally press-fitted into the ground, if the inside of the steel pipe is blocked by earth and sand, the penetration resistance increases, which may cause construction troubles. For example, Patent Document 1 discloses a method for preventing this blockage due to earth and sand.

In Patent Document 1, "open-ended steel pipe pile for rotary press-fitting", a fluid supply pipe is piped along the inner wall of the steel pipe pile from the upper end to the middle of the steel pipe pile, and the inner wall of the steel pipe pile is connected to the lower end of the pipe. An annular pipe is arranged in the circumferential direction along the above, and a second fluid supply pipe of 2 or more and 8 or less is piped downward from the lower end of the annular pipe along the inner wall of the steel pipe pile. " ing.
Then, by discharging the fluid in the circumferential direction along the inner wall of the steel pipe from the nozzles for discharging the fluid provided in each of the second fluid supply pipes, the fluid is interposed between the inner wall of the steel pipe and the earth and sand. , Prevents blockage in the steel pipe.

Patent No. 4242251

In the method described above, in addition to the annular pipe, it is necessary to pipe a plurality of fluid supply pipes to the annular pipe, which is very troublesome. Further, since the annular pipe and the second fluid supply pipe receive a strong reaction force from the ground when the steel pipe pile is rotationally press-fitted, it is necessary to reinforce it firmly in order to prevent the destruction due to this.

Further, conventionally, since the direction of injecting the fluid is the circumferential direction along the inner wall of the steel pipe pile, the fluid can be injected only at a certain height. Therefore, when injecting a fluid into a wider area in the height direction, it is necessary to arrange a plurality of fluid discharge nozzles in the height direction, and it is difficult to install and fix the nozzles in the steel pipe.

The present invention has been made to solve such a problem, the pipe for fluid supply can be easily arranged, and the pipe for fluid supply is prevented from receiving a strong reaction force from the ground at the time of rotational press-fitting. It is an object of the present invention to obtain a steel pipe pile and a method for constructing the steel pipe pile, a method for designing the steel pipe pile, and a method for manufacturing the steel pipe pile, which can suppress blockage in the steel pipe.

(1) The steel pipe pile according to the present invention is to be rotationally press-fitted into the ground, and has a spiral shape that protrudes toward the inner surface side of the tip of the steel pipe constituting the steel pipe pile and is continuously or intermittently provided. From the holding member, one or more fluid supply pipes arranged downward along the inner wall of the steel pipe to supply the fluid from the upper end of the steel pipe, and the lower end of the fluid supply pipe. A fluid discharge pipe is provided so as to allow the supplied fluid to flow, and is arranged along the upper surface of the spiral holding member and has a fluid discharge port formed on the peripheral surface to discharge the fluid. It is characterized by that.

(2) Further, in the one described in (1) above, the steel pipe has a notch portion spirally cut out at the tip thereof, and the spiral holding member is provided along the notch portion. It is characterized in that an excavation part for excavating the ground is formed at the tip portion thereof.

(3) Further, in the above-mentioned (1) or (2), a discharge nozzle having a fluid discharge port for discharging a fluid is provided at the tip of the fluid discharge pipe.

(4) Further, in the above (1) or (2), a discharge nozzle having a fluid discharge port for discharging a fluid is provided near the tip of the spiral holding member, and the fluid is supplied to the discharge nozzle. The fluid supply pipe is provided separately from the one that supplies the fluid to the fluid discharge pipe.

(5) Further, the method for constructing a steel pipe pile according to the present invention is to rotationally press-fit the steel pipe pile according to any one of (1) to (4) above into the ground, and when the steel pipe pile is rotationally press-fitted. It is characterized in that a fluid is supplied to the fluid supply pipe and the fluid is discharged from the fluid discharge port.

(6) Further, the method for designing a steel pipe pile according to the present invention is to design a steel pipe pile that is rotationally press-fitted into the ground, and protrudes toward the inner surface side of the steel pipe at the tip of the steel pipe constituting the steel pipe pile. Together with, a continuous or intermittent spiral holding member is set so that one or more fluid supply pipes for supplying fluid are directed downward along the inner wall of the steel pipe from the upper end of the steel pipe. A fluid discharge pipe, which is set and has a fluid discharge port for discharging the fluid on the peripheral surface, is placed on the upper surface of the spiral holding member so that the fluid supplied from the lower end of the fluid supply pipe can flow through the pipe. It is characterized by being set to follow.

(7) Further, the method for manufacturing a steel pipe pile according to the present invention is to manufacture a steel pipe pile that is rotationally press-fitted into the ground, and protrudes toward the inner surface side of the steel pipe at the tip of the steel pipe constituting the steel pipe pile. Together with, a continuous or intermittent spiral holding member is formed so that one or more fluid supply pipes for supplying fluid are directed downward along the inner wall of the steel pipe from the upper end of the steel pipe. A fluid discharge pipe having a fluid discharge port formed on the peripheral surface thereof so as to allow the fluid supplied from the lower end of the fluid supply pipe to flow through and along the upper surface of the spiral holding member. It is characterized by being attached in such a way.

In the present invention, a spiral holding member protruding toward the inner surface side of the tip of the steel pipe and a fluid discharge pipe arranged along the upper surface of the spiral holding member are provided in the fluid discharge pipe. By discharging the fluid from the fluid discharge port, the fluid can be widely discharged in the height direction, and the clogging of the inside of the steel pipe is effectively prevented. In addition, since the fluid discharge pipe is arranged on the upper surface of the spiral holding member without branching, it is easy to install, and it does not receive a direct reaction force from the ground even during rotational press-fitting, so it breaks. There is little danger.

It is explanatory drawing of the steel pipe pile which concerns on one Embodiment of this invention. 2 (a) is a bottom view of the steel pipe pile shown in FIG. 1, FIG. 2 (b) is a sectional view taken along the line AA of FIG. 2 (a), and FIG. 2 (c) is a view of BB of FIG. 2 (a). It is a cross-sectional view. It is explanatory drawing of another aspect of the steel pipe pile which concerns on one Embodiment of this invention (the 1). It is explanatory drawing of another aspect of the steel pipe pile which concerns on one Embodiment of this invention (the 2). It is explanatory drawing of another aspect of the steel pipe pile which concerns on one Embodiment of this invention (the 3).

The steel pipe pile 1 according to the embodiment of the present invention is to be rotationally press-fitted into the ground, and as shown in FIGS. 1 and 2, the steel pipe 3 and the spiral holding member provided at the tip of the steel pipe 3 are provided. 5. The fluid supply pipe 7 for supplying the fluid and the fluid discharge pipe 9 provided so as to allow the fluid supplied from the lower end of the fluid supply pipe 7 to flow are provided.
Each configuration will be described in detail below.

<Steel pipe>
The steel pipe 3 constitutes the steel pipe pile 1, and has a notch portion 3a notched in a spiral shape at the tip thereof. The reason why the cutout portion 3a is provided in the steel pipe 3 in the present embodiment will be described later.

<Spiral holding member>
The spiral holding member 5 is a member for holding the fluid discharge pipe 9, and is provided in a spiral shape along the notch 3a while projecting toward the inner surface side of the tip of the steel pipe 3.

As described above, the spiral holding member 5 projects toward the inner surface side of the tip of the steel pipe 3, and the fluid discharge pipe 9 is arranged on the upper surface thereof. Therefore, the steel pipe pile 1 is rotated in the direction indicated by the black arrow in FIG. While press-fitting, the spiral holding member 5 digs while receiving the reaction force from the ground, so that the fluid discharge pipe 9 does not receive the reaction force directly from the ground.
As shown by the alternate long and short dash line in FIG. 2C, the ground through which the spiral holding member 5 passes is loosened into a donut shape having an inner diameter smaller than the inner diameter of the steel pipe 3.

In order to prevent the fluid discharge pipe 9 from receiving the reaction force from the ground during rotational press fitting by holding the fluid discharge pipe 9 by the spiral holding member 5, the inner surface of the tip of the steel pipe 3 in the spiral holding member 5 The width a protruding to the side (see FIG. 2B) is preferably equal to or slightly larger than the outer diameter of the fluid discharge pipe 9.

Further, an excavation portion 5a for excavating the ground is formed at the tip end portion of the spiral holding member 5 of the present embodiment. As shown in FIG. 1, the excavation portion 5a has an inclined surface that inclines upward with respect to the horizontal, and by providing such an excavation portion 5a, the excavation efficiency of the ground can be improved.
By improving the excavation efficiency by the excavation portion 5a, the discharge pressure of the fluid can be reduced (for example, about 0.02MPa to 1MPa).

When the excavated portion 5a is provided at the tip of the spiral holding member 5, it is preferable to provide the spiral notch 3a in the steel pipe 3 as in the present embodiment. The reason is as follows.
As described above, since the excavated portion 5a has an inclined surface that inclines upward with respect to the horizontal, the soil excavated by the excavated portion 5a at the time of rotational press-fitting is scooped up by the inclined surface of the excavated portion 5a, and the steel pipe is used. Move upwards inside. On the other hand, the soil inside the steel pipe pile 1 moves downward together with the steel pipe pile 1 due to friction with the inner wall of the steel pipe. Therefore, at the inner tip of the steel pipe pile 1, the soil that is scooped up by the excavation portion 5a and moves upward collides with the soil that moves downward together with the steel pipe pile 1, resulting in soil compaction at that portion. Occlusion due to.

In this respect, by providing the notch 3a in the steel pipe 3 as in the present embodiment, as shown in FIGS. 2 (b) and 2 (c), there is an oblique opening 10 in the side view, so that excavation is performed. Even if the soil scooped up by the portion 5a and moves upward and the soil moving downward together with the steel pipe pile 1 collide, the opening 10 becomes a refuge for the soil, and even if compaction occurs, the blockage does not occur. Therefore, it is possible to suppress the harmful effects of soil blockage.

<Fluid supply pipe>
The fluid supply pipe 7 supplies a fluid to the fluid discharge pipe 9, and is arranged downward from the upper end of the steel pipe 3 along the inner wall of the steel pipe 3.
As described above, since the ground near the inner wall of the steel pipe 3 is loosened by the spiral holding member 5 protruding toward the inner surface side of the steel pipe 3 (see the two-point chain line in FIG. 2C), the inner wall of the steel pipe 3 is covered. The fluid supply pipe 7 arranged along the line does not receive a strong reaction force from the ground. Therefore, it is possible to reduce the reinforcement of the fluid supply pipe 7 and its attachment portion (piping band, welded portion, etc.) as compared with the conventional example.

Examples of the fluid supplied to the fluid supply pipe 7 include water and air. Although the predetermined effect can be obtained by using water or air, an excavation liquid such as bentonite melt may be used if necessary. Further, a mixture of water and air, a mixture of excavation liquid and air, and the like may be used.

<Fluid discharge pipe>
The fluid discharge pipe 9 is arranged along the upper surface of the spiral holding member 5 and discharges the fluid supplied from the fluid supply pipe 7 to the inside of the steel pipe 3. A fluid discharge port 9a for discharging the fluid is formed on the peripheral surface of the fluid discharge pipe 9, and a discharge nozzle 11 having a fluid discharge port for discharging the fluid is provided at the tip thereof.
The fluid discharge port 9a is provided with a hole of, for example, about 2 mm in the fluid discharge pipe 9, and a part of the fluid flowing through the fluid discharge pipe 9 is discharged from the fluid discharge port 9a.
Further, the fluid is discharged from the fluid discharge port of the discharge nozzle 11 provided at the tip of the fluid discharge pipe 9 toward the vicinity of the excavation portion 5a provided at the tip of the spiral holding member 5.

When constructing the steel pipe pile 1 configured as described above, a fluid such as water, excavation liquid, air, or a mixed fluid thereof is supplied to the fluid supply pipe 7, and the fluid discharge port 9a and the discharge nozzle are supplied. The steel pipe pile 1 is rotationally press-fitted while discharging the fluid from the fluid discharge port of 11.
At that time, as shown by the white arrow in FIG. 1, since the fluid is discharged upward from the fluid discharge port 9a provided on the upper surface of the fluid discharge pipe 9, the fluid is discharged upward from the end of the steel pipe pile 1. It is possible to mix the earth and sand of the above and the fluid, and it is possible to eliminate the earth and sand clogging in the inner part of the steel pipe as compared with the conventional example.

Further, the fluid is discharged toward the spiral holding member 5 from the fluid discharge port 9a provided on the lower surface of the fluid discharge pipe 9. In this case as well, the sediment clogging can be eliminated by mixing the sediment and the fluid in the vicinity of the fluid discharge port 9a. Further, since the spiral holding member 5 can be cooled by discharging the fluid toward the spiral holding member 5, it is possible to prevent damage to the spiral holding member 5 that occurs during rotational press fitting.

Further, the fluid is discharged from the discharge nozzle 11 provided at the tip of the fluid discharge pipe 9 in the vicinity of the excavated portion 5a of the spiral holding member 5. The excavated portion 5a is a portion that becomes the foremost part of excavation when the steel pipe pile 1 is rotationally press-fitted, and the vicinity of the excavated portion 5a is unexcavated hard ground (original ground). The ground can be made softer, which is effective in reducing penetration resistance and preventing sediment clogging.

In the present invention, the fluid discharge port 9a may be provided on the peripheral surface of the fluid discharge pipe 9, and the position thereof is not limited, but as described above, rather than being provided on the side surface of the fluid discharge pipe 9. It is preferable to provide it on the upper surface or the lower surface because it is more effective in preventing sediment clogging. The reason is as follows.
As described above, soil blockage occurs due to the compaction of soil caused by the collision between the soil that has moved downward due to friction with the inner wall of the steel pipe and the soil that has been excavated and moved to the inside of the steel pipe. In this regard, by providing the fluid discharge port 9a on the upper surface or the lower surface of the fluid discharge pipe 9 to discharge the fluid, the fluid infiltrates into the interface between the inner wall of the steel pipe and the soil, and the frictional force between the inner wall of the steel pipe and the soil is reduced. However, the movement of the soil inside the steel pipe can be facilitated, and the compaction of the soil inside the steel pipe is less likely to occur.
On the other hand, for example, when the fluid discharge port 9a is provided on the center side of the steel pipe diameter, the fluid is discharged toward the earth and sand on the center side of the steel pipe diameter, so that the friction between the inner wall of the steel pipe and the soil is reduced. The effect of preventing soil blockage is low because it cannot fully exert its action.
Therefore, it is preferable to provide the fluid discharge port 9a on the upper surface, the lower surface, or both of the fluid discharge pipe 9 because the effect of preventing sediment clogging can be highly obtained as described with reference to FIG.

Further, in the present invention, the fluid discharge pipe 9 may be provided so as to allow the fluid supplied from the lower end of the fluid supply pipe 7 to flow through, and the connection position thereof is not limited, but is shown in FIG. As described above, it is preferable that the lower end of the fluid supply pipe 7 is connected to the upper end of the fluid discharge pipe 9.
By doing the above, since the fluid is supplied from a position above all the fluid discharge ports 9a, gravity acts in addition to the pressure for supplying the fluid, and the fluid discharge port 9a is efficiently supplied. A fluid can be supplied.

Further, as described above, since the spiral holding member 5 serves as a protective member for the fluid discharge pipe 9 at the time of rotational press fitting, the fluid discharge pipe 9 and its attachment portion (piping band and welded portion) are compared with the conventional example. Etc.) can be reduced.

As described above, in the present embodiment, the steel pipe pile 1 is rotationally press-fitted while discharging the fluid from the fluid discharge pipe 9 spirally arranged on the upper surface of the spiral holding member 5, so that the steel pipe pile 1 is rotationally press-fitted in the height direction. A wide range of fluid can be discharged, soil blockage inside the steel pipe 3 can be efficiently prevented, and penetration resistance can be suppressed.
Further, the installation is simpler than in the conventional example, and the fluid discharge pipe 9 does not receive a direct reaction force from the ground even during rotational press-fitting, so that there is less risk of destruction.

In the above description, an example in which the discharge nozzle 11 is provided at the tip of the fluid discharge pipe 9 is used, but the present invention is not limited to this, and for example, as shown in FIG. 3, the fluid supply pipe 7 is 2 This may be provided so that the fluid discharge pipe 9 is connected to one tip and the discharge nozzle 11 is provided at the other tip. As described above, by providing the fluid supply pipe 7 for supplying the fluid to the discharge nozzle 11 separately from the pipe for supplying the fluid to the fluid discharge pipe 9, the fluid can be discharged from the discharge nozzle 11 at a high pressure. .. At this time, it is preferable that the position of the discharge nozzle 11 is provided near the tip of the spiral holding member 5 as in FIG. By providing the discharge nozzle 11 near the tip of the spiral holding member 5, the fluid can be mixed with the ground at the front of the rotary press-fitting as described above, which is effective in reducing the penetration resistance and preventing the clogging of sediment. be. Further, in the case of FIG. 3, the tip of the fluid discharge pipe 9 is closed to show an example in which the fluid is not discharged. Of course, the present invention is not limited to this, and the fluid may be opened to discharge the fluid.
Although two fluid supply pipes 7 are provided in FIG. 3, for example, one fluid supply pipe 7 is branched in the middle, one of which is branched to the fluid discharge pipe 9 and the other to the discharge nozzle 11. You may try to connect.

Further, the spiral holding member 5 according to the present invention does not necessarily have to be continuous in the spiral direction, and as shown in FIG. 4, a plurality of single length members 5b are arranged in the spiral direction at predetermined intervals. It may constitute the spiral holding member 5 as a whole. As described above, even when the spiral holding member 5 is not continuous, the spiral holding member 5 has an inner diameter smaller than the inner diameter of the steel pipe 3 as shown by the alternate long and short dash line in FIG. 2 (c). Since the digging is carried out while loosening the ground in a shape, the fluid discharge pipe 9 is not directly subjected to the reaction force of the ground, and the same effect as in FIG. 1 can be obtained.

If you expect press-fitting assistance by the propulsive force at the time of taking in soil (a downward force is applied to the steel pipe by moving the soil on the overhanging portion of the spiral holding member 5 by rotation), the spiral holding member 5 It is desirable that the length of the steel pipe pile is at least 50% or more of the entire circumference of the steel pipe pile 1. This is because, when it is less than 50%, the soil on the overhanging portion of the spiral holding member 5 falls from the spiral holding member 5 before exerting the propulsive force.

In the example shown in FIG. 1, one notch 3a is provided at the tip of the steel pipe pile 1, and the fluid discharge pipe 9 is arranged on the upper surface of the spiral holding member 5 provided substantially once along the notch 3a. Although it was provided, the present invention is not limited to this. For example, as shown in FIG. 5, two notches 3a are provided in the steel pipe pile 1, and a fluid discharge pipe 9 is provided on the upper surfaces of the two spiral holding members 5 provided along each notch 3a. It may be arranged.
In this case, it is preferable that the lower tips of the spiral holding members 5 have the same height in the vertical direction. This is because the load acting on the tip of the spiral holding member 5 during excavation is dispersed, the load on the spiral holding member 5 is reduced, and the plate thickness of the spiral holding member 5 can be reduced.

Note that FIG. 5 is an example in which two fluid supply pipes 7 are provided and the fluid discharge pipes 9 are connected to each of them. However, as in the case of FIG. 3, one fluid supply pipe 7 is inserted in the middle. The branched fluid supply pipe 7 may be connected to each of the fluid discharge pipes 9.

As an example of mounting the spiral holding member 5, in FIGS. 1 to 5, a case where the upper surface of the spiral holding member 5 is brought into contact with the tip surface of the steel pipe 3 having the notch 3a is illustrated. The invention is not limited to this. For example, the side surface of the spiral holding member 5 may be attached so as to be in contact with the inner peripheral wall at the tip of the steel pipe 3. In this case, as compared with the cases of FIGS. 1 to 5, the spiral holding member 5 is in a state of being moved inward by the plate thickness of the steel pipe 3. Even in this case, the effect of protecting the fluid discharge pipe 9 can be similarly obtained by extending spirally in the circumferential direction of the steel pipe.

Further, the examples shown in FIGS. 1 to 5 are examples in which the steel pipe 3 has one or more notched portions 3a, but the present invention can also be applied to ordinary steel pipe piles having no notch at the tip.

The names of the fluid discharge pipe and the fluid supply pipe are given from a functional point of view, and may be physically connected to different members, or may be an integral product obtained by bending the same pipe. May be good. The fluid discharge pipe may be provided so that the fluid supplied from the lower end of the fluid supply pipe can flow through, and the fluid supplied from the lower end of the fluid supply pipe can flow through. It is included in any of the expressions being, provided, or arranged.

Further, a band-shaped outer friction cutter, a tip excavation blade, or the like may be installed at the lower end of the steel pipe pile 1 described above depending on the hardness of the ground to be rotationally press-fitted. It is expected that efficiency will be further improved.

Further, in the above description, the steel pipe pile 1 has been described as an invention of the product, but the steel pipe pile 1 according to the present embodiment is designed by the following design method.
It is a design method for designing steel pipe piles that are rotationally press-fitted into the ground.
At the tip of the steel pipe constituting the steel pipe pile, a continuous or intermittent spiral holding member is set so as to project toward the inner surface side of the steel pipe.
One or more fluid supply pipes for supplying fluid are set so as to go downward along the inner wall of the steel pipe from the upper end of the steel pipe.
A fluid discharge pipe having a fluid discharge port for discharging the fluid on the peripheral surface is allowed to flow through the fluid supplied from the lower end of the fluid supply pipe so as to be along the upper surface of the spiral holding member. Set.
The order of the constituent requirements of the steel pipe pile design method in the present invention is not limited to the order described above.

Further, in the above description, the steel pipe pile 1 has been described as an invention of the product, but the steel pipe pile 1 according to the present embodiment is manufactured by the following manufacturing method.
It is a manufacturing method for manufacturing steel pipe piles that are rotationally press-fitted into the ground.
At the tip of the steel pipe constituting the steel pipe pile, a continuous or intermittent spiral holding member is formed so as to project toward the inner surface side of the steel pipe.
One or more fluid supply pipes for supplying fluid are attached so as to go downward along the inner wall of the steel pipe from the upper end of the steel pipe.
A fluid discharge pipe having a fluid discharge port for discharging the fluid on the peripheral surface is attached so as to allow the fluid supplied from the lower end of the fluid supply pipe to flow and to be along the upper surface of the spiral holding member. ..
The order of the constituent requirements of the method for manufacturing a steel pipe pile in the present invention is not limited to the order described above.

1 Steel pipe pile 3 Steel pipe 3a Notch 5 Spiral holding member 5a Excavation part 5b Single scale material 7 Fluid supply pipe 9 Fluid discharge pipe 9a Fluid discharge port 10 Opening 11 Discharge nozzle

Claims (7)

It is a steel pipe pile that is rotationally press-fitted into the ground.
A spiral holding member that protrudes toward the inner surface of the tip of the steel pipe that constitutes the steel pipe pile and is provided in a continuous or intermittent spiral shape.
One or more fluid supply pipes arranged downward along the inner wall of the steel pipe to supply the fluid from the upper end of the steel pipe.
A fluid is provided so as to be able to flow through the fluid supplied from the lower end of the fluid supply pipe, and is arranged along the upper surface of the spiral holding member, and a fluid discharge port for discharging the fluid is formed on the peripheral surface. A steel pipe pile characterized by being equipped with a fluid discharge pipe. The steel pipe has a notch portion spirally cut out at its tip, and has a notch portion.
The steel pipe pile according to claim 1, wherein the spiral holding member is provided along the notch and an excavation portion for excavating the ground is formed at the tip thereof. The steel pipe pile according to claim 1 or 2, wherein a discharge nozzle having a fluid discharge port for discharging the fluid is provided at the tip of the fluid discharge pipe. A discharge nozzle having a fluid discharge port for discharging a fluid is provided in the vicinity of the tip of the spiral holding member, and a fluid supply pipe for supplying the fluid to the discharge nozzle is used to supply the fluid to the fluid discharge pipe. The steel pipe pile according to claim 1 or 2, characterized in that it is provided separately. A method for constructing a steel pipe pile in which the steel pipe pile according to any one of claims 1 to 4 is rotationally press-fitted into the ground.
A method for constructing a steel pipe pile, which comprises supplying a fluid to the fluid supply pipe and discharging the fluid from the fluid discharge port when the steel pipe pile is rotationally press-fitted. It is a design method for designing steel pipe piles that are rotationally press-fitted into the ground.
At the tip of the steel pipe constituting the steel pipe pile, a continuous or intermittent spiral holding member is set so as to project toward the inner surface side of the steel pipe.
One or more fluid supply pipes for supplying fluid are set so as to go downward along the inner wall of the steel pipe from the upper end of the steel pipe.
A fluid discharge pipe having a fluid discharge port for discharging the fluid on the peripheral surface is allowed to flow through the fluid supplied from the lower end of the fluid supply pipe and is along the upper surface of the spiral holding member. A method of designing a steel pipe pile, which is characterized by being set. It is a manufacturing method for manufacturing steel pipe piles that are rotationally press-fitted into the ground.
At the tip of the steel pipe constituting the steel pipe pile, a continuous or intermittent spiral holding member is formed so as to project toward the inner surface side of the steel pipe.
One or more fluid supply pipes for supplying fluid are attached so as to go downward along the inner wall of the steel pipe from the upper end of the steel pipe.
A fluid discharge pipe having a fluid discharge port for discharging the fluid on the peripheral surface is attached so as to allow the fluid supplied from the lower end of the fluid supply pipe to flow and to be along the upper surface of the spiral holding member. , A method of manufacturing a steel pipe pile.

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