JP6560922B2 - Steel pipe pile, steel pipe pile press-in method and steel pipe pile continuous wall - Google Patents

Description

  The present invention relates to a steel pipe pile, a method for press-fitting a steel pipe pile, and a steel pipe pile continuous wall.

Conventionally, as a technique for efficiently press-fitting a steel pipe pile into the ground, a pipe is arranged along the circumferential surface of the steel pipe pile, a nozzle provided at the tip of the pipe is attached to the lower end side in the steel pipe pile, and water is discharged from the nozzle. There is known a method in which a steel pipe pile is rotationally press-fitted into the ground while discharging a fluid such as (see, for example, Patent Documents 1 and 2).
In this method, fluid such as water is discharged from a nozzle attached to the lower end of the steel pipe pile to reduce the friction between the sand and the inner peripheral surface entering the steel pipe pile, or the earth and sand is blocked in the steel pipe pile. By preventing this, the steel pipe pile can be suitably press-fitted into the ground.

JP 2005-127095 A JP 2006-161212 A

  However, in the case of the above-mentioned Patent Documents 1 and 2, it is not sufficient as a countermeasure against friction acting on the outer peripheral surface. Therefore, when the steel pipe pile is long or the ground into which the steel pipe pile is press-fitted is sand ground or hard ground with a lot of fine particles, friction on the outer peripheral surface of the steel pipe pile may be a problem.

  This invention makes it a subject to reduce the friction of the inner peripheral surface and outer peripheral surface of a steel pipe pile sufficiently with a fluid, and to press-fit a steel pipe pile to the ground satisfactorily.

In order to solve the above problems, the invention according to claim 1 is a steel pipe pile press-fitted into the ground,
A pipe for fluid supply is attached,
A discharge port for fluids through the pipe is provided on the outer peripheral surface side of the steel pipe pile,
A plurality of internal and external communication holes penetrating the peripheral surface of the steel pipe pile are formed,
A part of the fluid discharged from the discharge port in the process of press-fitting construction is configured to flow upward along the inner and outer peripheral surfaces of the steel pipe pile through the inner and outer communication holes. Steel pipe pile.

  The invention according to claim 2 is the steel pipe pile according to claim 1, wherein the discharge ports are plural arranged at different heights along the central axis of the steel pipe pile.

The invention according to claim 3 is a steel pipe pile press-fitted into the ground,
A pipe for fluid supply is attached,
The discharge port of the fluid through the pipe is provided downward in the steel pipe pile, provided obliquely upward in the steel pipe pile, or provided obliquely downward in the steel pipe pile. Or provided inward from the tangential direction of the inner peripheral surface of the steel pipe pile in the steel pipe pile,
A plurality of internal and external communication holes penetrating the peripheral surface of the steel pipe pile are formed,
A part of the fluid discharged from the discharge port in the process of press-fitting construction is configured to flow upward along the inner and outer peripheral surfaces of the steel pipe pile through the inner and outer communication holes. Steel pipe pile.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, a plate-like member having a small hole that communicates with the inner and outer communication holes is provided on the outer peripheral surface. It is a steel pipe pile as described in one.

The invention according to claim 5 is a method of press-fitting a steel pipe pile, in which a pipe for fluid supply is attached, and a plurality of inner and outer communication holes are formed by penetrating the side face, and press-fitted into the ground.
A discharge port for fluids through the pipe is provided on the outer peripheral surface side of the steel pipe pile,
In the process of rotationally press-fitting the steel pipe pile into the ground, a part of the fluid discharged from the discharge port passes through the inner and outer communication holes and flows upward along the inner and outer peripheral surfaces of the steel pipe pile. This is a method for press-fitting steel pipe piles.

The invention according to claim 6 is a method for press-fitting a steel pipe pile, wherein a pipe for fluid supply is attached, and a plurality of inner and outer communication holes are formed by penetrating the side face and press-fitted into the ground.
The fluid outlet through the pipe is provided downward in the steel pipe pile, is provided obliquely upward in the steel pipe pile, is provided obliquely downward in the steel pipe pile, or Provided inward from the tangential direction of the inner peripheral surface of the steel pipe pile in the steel pipe pile,
In the process of rotationally press-fitting the steel pipe pile into the ground, a part of the fluid discharged from the discharge port passes through the inner and outer communication holes and flows upward along the inner and outer peripheral surfaces of the steel pipe pile. This is a method for press-fitting steel pipe piles.

The invention according to claim 7 is provided by limiting a through hole including the inner and outer communication holes to a pair of diagonal positions facing each other via a central axis of the steel pipe pile,
When constructing a continuous wall by press-fitting a plurality of the steel pipe piles adjacent to the ground, the steel pipe piles are placed on the ground so that diagonal lines connecting the pair of diagonal positions are along the continuous direction of the continuous walls. It is installed, It is the press-in method of the steel pipe pile of Claim 5 or Claim 6 characterized by the above-mentioned.

In the invention according to claim 8, a plurality of steel pipe piles provided by limiting a pair of diagonal positions where through-holes penetrating the side face are opposed to each other via a central axis are continuously installed on the ground. A continuous wall,
The adjacent steel pipe piles are disconnected by the ground,
It is a steel pipe pile continuous wall in which the steel pipe pile is installed so that a diagonal line connecting the pair of diagonal positions is along the continuous direction of the continuous wall.

  ADVANTAGE OF THE INVENTION According to this invention, the friction of the inner peripheral surface and outer peripheral surface of a steel pipe pile is fully reduced with the fluid supplied through a pipe and an internal / external connection hole, and a steel pipe pile can be press-fit | compressed favorably to the ground.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the steel pipe pile of 1st Embodiment of this invention, Comprising: FIG. (A) is a side view, FIG. (B) is a horizontal sectional view along the BB line | wire shown to FIG. ) Is a partial vertical cross-sectional view of a steel pipe pile, and shows a form in which the discharge port of fluid is directed downward in the pile. FIG. (D) is a partial vertical cross-sectional view of the steel pipe pile, and the discharge port of fluid Is shown on the outer peripheral surface side of the steel pipe pile. It is explanatory drawing which shows in cross section the flow of the water discharged from the discharge port in the process of rotationally press-fitting the steel pipe pile of the first embodiment of the present invention, and the discharge port is inside the steel tube pile as shown in FIG. An example of the flow of water in the case of being provided downward is shown. It is explanatory drawing which shows in cross section the flow of the water discharged from the discharge port in the process of rotationally press-fitting the steel pipe pile of the first embodiment of the present invention, and the discharge port is a steel pipe pile as shown in FIG. An example of the flow of water in the case of being provided on the outer peripheral surface side is shown. It is a figure which shows the steel pipe pile of 2nd Embodiment of this invention, Comprising: FIG. (A) is a side view, FIG. (B) is a horizontal sectional view along the C1-C1 line | wire shown to FIG. ) Is a horizontal sectional view taken along line C2-C2 shown in FIG. 1A, and FIG. 4D is a horizontal sectional view taken along line C3-C3 shown in FIG. It is an example of the deformation | transformation form with respect to 1st Embodiment of this invention, Comprising: FIG. (A) is a partial longitudinal cross-sectional view of a steel pipe pile, and shows the form which provides the discharge port of a fluid substance in the circumferential direction in a pile. (b) is a partial longitudinal cross-sectional view of a steel pipe pile, and shows a mode in which the discharge port for fluid is directed radially inward. It is an example of the deformation | transformation form with respect to 1st Embodiment of this invention, Comprising: The form which provides the discharge port of a fluid thing toward diagonally upward in a pile is shown. It is an example of the deformation | transformation form with respect to 1st Embodiment of this invention, Comprising: The form which provides the discharge port of a fluid thing toward diagonally downward in a pile is shown. It is a horizontal sectional view showing the steel pipe pile continuous wall concerning one embodiment of the present invention. It is explanatory drawing which shows the flow of the water discharged from the nozzle in the process of rotationally press-fitting the conventional steel pipe pile in a cross-sectional view.

   Hereinafter, embodiments of a steel pipe pile and a method for press-fitting a steel pipe pile according to the present invention will be described in detail with reference to the drawings.

[First Embodiment]
First, a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 to 3, the steel pipe pile 10 of the present embodiment is a cylindrical steel pipe pile 10 provided with a plurality of internal and external communication holes 11 penetrating the peripheral surface thereof. A plurality of cutting bits 4 are attached to the distal end side of the steel pipe pile 10 via a ring member 4r in order to assist rotational press-fitting of the steel pipe pile 10.
The internal / external communication hole 11 causes fluid such as water supplied into or out of the steel pipe pile 10 to flow out from the inner peripheral surface side to the outer peripheral surface side in the process of press-fitting the steel pipe pile 10 into the ground. The fluid is sufficiently distributed to the inner peripheral surface and the outer peripheral surface of the steel pipe pile 10 by flowing into the inner peripheral surface side from the outer peripheral surface side, and the inner peripheral surface and the outer peripheral surface of the steel pipe pile 10 by the fluid. It is formed in order to sufficiently reduce the friction.
The pipe hole 12 is formed in order to connect the fluid supply pipe 2 and provide the discharge port e on the outer peripheral surface side of the steel pipe pile 10.
Both the inner and outer communication holes 11 and the piping hole 12 are through holes formed in the side wall of the steel pipe pile 10. The inner and outer communication holes 11 are formed in the main steel pipe 10 a of the steel pipe pile 10. The piping hole 12 can be drilled in the main steel pipe 10a or in the ring member 4r. In the present embodiment, the ring member 4r is formed. In the inner and outer communication holes 11, the inner opening is opened to the inner main space of the steel pipe pile 10, the outer opening is opened to the outer space of the steel pipe pile 10, and the piping hole 12 is opened to the inner opening. The pipe 2 is connected, and the outer opening is opened to the external space of the steel pipe pile 10. Here, the internal main space is a space that extends from the upper end opening to the lower end opening of the steel pipe pile 10 with the inner peripheral surface of the steel pipe pile 10 as the outer edge. However, the space occupied by the installation such as the pipe 2 is excluded.

On the inner peripheral surface of the steel pipe pile 10, a water supply pipe 2 is disposed. The rear end side of the pipe 2 is connected to the water pump 3 via a swivel joint. In this embodiment, water is used as the fluid, and the water supply pipe 2 and the water pump 3 are provided for supplying the fluid.
The discharge port e of the fluid through the pipe 2 is provided downward in the steel pipe pile 10 as shown in FIG. 1 (c), or the outer peripheral surface of the steel pipe pile 10 as shown in FIG. 1 (d). Provided on the side.
When the discharge port e is provided downward in the steel pipe pile 10 as shown in FIG. 1 (c), the tip opening of the pipe tip 1 becomes the discharge port e, and the fluid is discharged downward from the discharge port e. The In this case, the pipe tip portion 1 may be configured as a nozzle part, and may have a nozzle shape that tapers toward the discharge port e. In addition, the height position of the discharge port e may be in the ring member 4r or in the main body steel pipe 10a.
When the discharge port e is provided on the outer peripheral surface side of the ring member 4r as shown in FIG. 1 (d), the pipe 2 is connected to the piping hole 12, and the outer opening of the piping hole 12 is the discharge port e. . As shown in FIG. 1 (d), in addition to the configuration in which the hole 1a drilled in the side surface of the pipe 2 is connected to the piping hole 12, a pipe joint component or discharge port e for connecting the pipe 2 to the piping hole 12 is used. The nozzle for forming is appropriately used. As the former pipe joint component, an L-shaped bent part may be applied and inserted into the pipe hole 12. In addition, an L-shaped bent portion may be applied to the outer peripheral surface side of the steel pipe pile 10 to form a flow path, and the discharge port e may be directed in the direction along the outer peripheral surface on the outer peripheral surface side of the steel pipe pile 10. . Accordingly, the direction in which the discharge port e is directed (the direction in which the fluid is discharged) may be the radially outer side of the steel pipe pile 10 as shown in FIG. 1 (d), or the horizontal direction along the outer peripheral surface of the steel pipe pile 10. , Upward, downward, diagonally upward, diagonally downward, etc.

A plate-like member 5 having a small hole 5 a is provided at a location where the inner and outer communication holes 11 are formed on the outer peripheral surface of the steel pipe pile 10.
The plate member 5 is a member in which a small hole 5 is formed at substantially the center of a flat steel plate, and is fixed to the outer peripheral surface of the steel pipe pile 10 by welding so that the inner and outer communication holes 11 and the small hole 5a communicate with each other. It is installed. The plate-like member 5 is provided to reinforce the inner / outer communication hole 11 formed in the steel pipe pile 10. In addition, the size and thickness of the plate-like member 5 are arbitrary, and what is appropriately adjusted according to the length and thickness of the steel pipe pile 10 and the size of the inner and outer communication holes 11 may be used.
Similarly, the plate-like member 5 may reinforce the portion where the pipe connection hole 12 is formed.

  Next, a method for press-fitting the steel pipe pile 10 described above into the ground will be described.

In order to press-fit the steel pipe pile 10 into the ground, a pile press-in machine is used.
The pile press-in machine is provided at the lower part of the machine main body and clamps the existing pile, and the chuck device provided at the front end of the machine main body and holding the pile pressed into a position adjacent to the existing pile, It has. This pile press-fitting machine grabs the upper end of the existing pile with the clamp device, and with the reaction force taken from the existing pile, lowers the chuck device that holds the pile so that the pile is pressed into the ground. It has become. In addition, since the structure and operation | movement of a pile presser are the same as that of a conventionally well-known thing, it is not explained in full detail here.

  It is preferable that the press-fitting construction of the steel pipe pile 10 to the ground is performed by rotary press-fitting. In the case of rotary press-fitting, the cutting bit 4 is attached to the tip of the steel pipe pile 10 to punch through the existing structure, and even if the ground is hard, it can be press-fitted with almost no noise and vibration, and the existing structure and the surrounding ground The influence on can be suppressed.

And when the steel pipe pile 10 is press-fitted into the ground, the water pump 3 is operated to supply water into and out of the steel pipe pile 10. Specifically, in the process of rotationally press-fitting the steel pipe pile 10 into the ground, the water fed through the pipe 2 is discharged so as to be ejected from the discharge port e.
As shown in FIG. 2 or FIG. 3, a part of the water (jet water) discharged from the discharge port e flows through the inner and outer communication holes 11 and along the inner and outer peripheral surfaces of the steel pipe pile 10. .
2 shows an example of the flow of water when the discharge port e is provided downward in the steel pipe pile 10 as shown in FIG. 1 (c), and FIG. 3 shows FIG. 1 (d). An example of the flow of water when the discharge port e is provided on the outer peripheral surface side of the steel pipe pile 10 is shown.

  Regardless of FIG. 2 and FIG. 3, a part of the plurality of pipes 2 is applied when the discharge port e is provided downward in the steel pipe pile 10 as shown in FIG. 1 may be applied when the discharge port e is provided on the outer peripheral surface side of the steel pipe pile 10 as shown in FIG. In this case, fluid outlets e can be provided in the steel pipe pile 10 and on the outer peripheral surface side.

As described above, by forming the plurality of internal and external communication holes 11 on the peripheral surface of the steel pipe pile 10, the discharge (injection) is performed from the discharge port e disposed inside or / and on the outer peripheral surface side of the steel pipe pile 10. ) Part of the water flows to the opposite peripheral surface of the steel pipe pile 10 through the inner and outer communication holes 11, so that an appropriate amount of water flows on both the inner peripheral surface and the outer peripheral surface of the steel pipe pile 10. The pile 10 can be press-fitted into the ground.
That is, if it is the steel pipe pile 10 in which the some internal / external communication hole 11 is formed, it can perform rotary press-fit construction, flowing an appropriate amount of water to the inner peripheral surface and the outer peripheral surface, respectively. Friction between the ground and earth and sand acting on the inner and outer peripheral surfaces of the pile 10 can be reduced by the water flow.
On the other hand, in the case of the conventional steel pipe pile 20 shown in FIG. 9, since the inner and outer communication holes 11 are not formed on the peripheral surface thereof, the outer peripheral surface of the steel pipe pile 20 is opened from the tip (lower end) opening of the steel pipe pile 20. Since only the spilled water flows, when the conventional steel pipe pile 20 is rotationally press-fitted, friction with the ground and earth and sand acts on the outer peripheral surface thereof.
In addition, the number and position of the inner and outer communication holes 11 formed in the steel pipe pile 10 are arbitrary, and are adjusted as appropriate according to the length, thickness, and diameter size of the steel pipe pile 10, and the inner peripheral surface and the outer peripheral surface of the steel pipe pile 10 are adjusted. What is necessary is just to design so that an appropriate amount of water flows on both sides.

Moreover, since the plate-shaped member 5 provided in order to reinforce the inner and outer communication hole 11 part of the steel pipe pile 10 protrudes from the outer peripheral surface of the steel pipe pile 10 by the thickness, when rotating and press-fitting the steel pipe pile 10, it is plate-shaped. The member 5 can exhibit an effect as a friction cut.
That is, since this steel pipe pile 10 is provided with the plate-like member 5 functioning as a friction cut on the outer peripheral surface in addition to the water flow that reduces the friction acting on the outer peripheral surface, the steel pipe pile 10 can be pressed into the ground satisfactorily. .

[Second Embodiment]
Next, a modification to the first embodiment will be disclosed.
First, as a second embodiment of the present invention, this will be described with reference to FIG.
As shown in FIG. 4, in the steel pipe pile 10 of the present embodiment, the inner and outer communication holes 11 are a plurality arranged at different heights along the central axis of the steel pipe pile 10, and also for fluid supply. A plurality of piping holes 12 (and hence discharge ports e) to which the pipes 2 are connected are arranged at different heights along the central axis of the steel pipe pile 10. A piping hole 12 was arranged between the inner and outer communication holes 11, 11 along the central axis of the steel pipe pile 10. In addition, the said 1st Embodiment is the same also about the point made into the plurality with which the inner / outer connection hole 11 is arrange | positioned in the different height along the central axis of the steel pipe pile 10. FIG.
The through holes 11 and 12 including the inner and outer communication holes 11 are limited to a pair of diagonal positions facing each other through the central axis of the steel pipe pile 10. The inner and outer communication holes 11 are provided at both the diagonal positions, and the piping holes 12 are provided at one of the diagonal positions. Regardless of this, since it is limited to the diagonal position, the piping holes 12 may be provided at both the diagonal positions.
In the pipe front end portion 1 for disposing the discharge port e at the lowermost end, a structure in which the discharge port e is provided downward in the steel pipe pile 10 as shown in FIG.
As described above, by providing a plurality of discharge ports e provided on the outer peripheral surface side of the steel pipe pile 10 at different heights, it is possible to reliably supply fluid to the outer peripheral surface of the steel pipe pile 10 over a wide range in the height direction. Can be supplied. A part of the fluid discharged from the discharge port e and flowing along the outer peripheral surface flows into the inner peripheral surface side through the inner and outer communication holes 11.
As described above, the inner and outer communication holes 11 and the piping holes 12 (therefore, the discharge ports e) can be arranged while being dispersed in the axial direction. As a result, appropriate amounts are provided on the inner peripheral surface and the outer peripheral surface of the steel pipe pile 10, respectively. The plate-like member 5 functioning as the above-described friction cut can be similarly distributed in the axial direction. The plate member 5 may be provided for the piping hole 12. In that case, the plate-like member 5 that functions as the friction cut described above can be installed at a height different from that of the inner and outer communication holes 11.

As mentioned above, the discharge port e provided in the outer peripheral surface side of the steel pipe pile 10 was arrange | positioned in the mutually different height position in the position above the lowermost discharge port e provided in the steel pipe pile 10. FIG. The discharge of fluid from the discharge ports e having different heights is configured such that the discharge can be started and stopped independently by an operation valve or the like.
When the lower end of the steel pipe pile 10 enters the permeable layer or further penetrates the permeable layer, the fluid discharged from the discharge port e provided at the lower end in the steel pipe pile 10 is sucked into the permeable layer. The fluid material may not be supplied to the position above the water permeable layer of the steel pipe pile 10. Even in such a case, the fluid material is discharged from the discharge port e disposed above the water permeable layer and below the ground. This is because the fluid can be supplied also to a position above the water permeable layer of the steel pipe pile 10 and the discharge can be started sequentially from the discharge port e buried under the ground.
In addition, as the steel pipe pile becomes longer, the fluid discharged from the lowermost discharge port e may not be sufficiently supplied above (preferably near the ground), and it may take a long time to be supplied. There is. Also in this case, by discharging the fluid material from the discharge port e located above the lowermost discharge port e and below the ground, the fluid material can be quickly moved to the position above the lowermost discharge port e. In addition, it can be sufficiently supplied, and the discharge can be started sequentially from the discharge port e buried under the ground.
In addition, the discharge port provided in the steel pipe pile 10 is not limited to the discharge port e at the lowermost end, and in addition to this, a plurality of discharge ports including one discharge port or ones having different heights from each other may be provided. You may implement by providing a discharge outlet. The direction in which each discharge port faces (the direction in which the fluid is discharged) can be implemented by appropriately selecting the lower side, the side, the diagonally upward, the diagonally downward, and the like. Thereby, a fluid substance can be supplied to the inner peripheral surface and outer peripheral surface of a steel pipe pile which contacts a ground and earth and sand earlier and fully.

[Other variations]
In the case where the discharge port e is provided in the steel pipe pile 10 in the first embodiment, the discharge port e is provided downward as shown in FIG. 1 (c). However, as shown in FIG. In the configuration shown in FIG. 5 (a), the discharge port e is arranged in the circumferential direction of the steel pipe pile 10 (= the tangential direction of the inner peripheral surface of the steel pipe pile).
In the configuration shown in FIG. 5 (b), the discharge port e is arranged toward the radially inner side of the steel pipe pile 10. In addition, you may arrange | position toward the inward from the tangential direction of the internal peripheral surface of the steel pipe pile 10 by giving an angle around the longitudinal direction axis | shaft of the steel pipe pile 10. FIG.

  Further, in the configuration shown in FIGS. 1 (d) and 5, the discharge port is formed so as to be drilled in the side portion of the pipe cylindrical portion (pipe tip portion 1) in which the shaft is arranged in a direction parallel to the central axis of the steel pipe pile 10. Although e is provided, the opening of the pipe cylindrical part (pipe tip part 1) bent from a direction parallel to the central axis of the steel pipe pile 10 may be used as the discharge port e. In this case, it is possible to implement a mode in which the direction in which the discharge port e faces (the direction in which the fluid is discharged) is obliquely upward as shown in FIG. 6, and is obliquely downward as shown in FIG. In any form, the pipe joint part and the nozzle part are appropriately used.

  As an embodiment that effectively uses the internal / external flow of the fluid through the inside / outside communication hole 11, a mode in which the discharge port (e) of the fluid through the pipe (2) is provided downward in the steel pipe pile, In addition to the form provided on the outer peripheral surface side of the steel pipe pile, the form provided obliquely upward in the steel pipe pile, the form provided obliquely downward in the steel pipe pile, the steel pipe pile of the steel pipe pile in the steel pipe pile The form provided inward from the tangential direction of an inner peripheral surface can be implemented.

[Effects and others]
As mentioned above, the steel pipe pile 10 of this embodiment discharges (injects) water from the discharge port e arrange | positioned inside or / and the outer peripheral surface side of the steel pipe pile 10, and the inner peripheral surface and outer periphery Since an appropriate amount of water can be made to flow on each surface, the rotary press-fit construction can be suitably performed by reducing friction with the ground or earth and sand acting on the steel pipe pile 10 by the water flow.
That is, the steel pipe pile 10 can be rotationally press-fitted while flowing an appropriate amount of water on the inner peripheral surface and the outer peripheral surface of the steel pipe pile 10 and reducing the friction acting on the inner peripheral surface and the outer peripheral surface by the water flow. In addition, the steel pipe pile 10 can be press-fitted satisfactorily even to the ground that has been difficult to construct by the conventional technology. Not only the qualitative range of the ground but also the pile length can be increased.
Moreover, since the friction which acts on the steel pipe pile 10 can be reduced and the rotary press-in construction can be performed, the steel pipe pile 10 can be pressed in more smoothly than before. As a result, the construction period in which the steel pipe pile 10 is press-fitted into the ground and buried can be shortened, and the construction cost can be reduced.

  In addition, in the above embodiment, although the cutting bit 4 was provided in the front end side of the steel pipe pile 10, this invention is not limited to this, For example, even if it is the structure which does not provide the cutting bit 4. Moreover, what provided the spiral excavation wing | blade (spiral wing | blade) in the front end side of the steel pipe pile 10 may be sufficient.

Moreover, the number of the discharge ports e and the water supply pipes 2 is not limited and can be appropriately changed according to the ground conditions.
After the steel pipe pile 10 is press-fitted, the pipe 2 may not be recovered and may remain attached to the steel pipe pile 10, but may be recovered. The collected material may be reused.
In order to collect it for reusability, the pipe 2 is fixed to the inner peripheral surface of the steel pipe pile 10 with a band having a cross-sectional Ω shape, and after pressing the steel pipe pile 10 up, the pipe is pulled upward, A method of cutting is known. In this method, a protrusion for cutting the band at the time of pipe displacement prevention and recovery is provided on the outer peripheral surface of the pipe.
A plurality of pipes 2 can be attached as a unit, and can be attached and recovered, whereby attachment and recovery can be performed efficiently. In that case, it is still more efficient if a plurality of pipes 2 are inserted into other large-diameter pipes to be unitized, and the large-diameter pipes are fixed with a band having a cross-sectional Ω shape. A plurality of pipes (hereinafter referred to as “inner pipes”) inserted into the large-diameter pipe each serve as a fluid supply path, and the gap between the inner peripheral surface of the large-diameter pipe and the internal pipe is also a fluid supply path. It becomes. Apply these fluid supply paths to those that communicate with different discharge ports (discharge ports provided on the outer peripheral surface of steel pipe piles, discharge ports provided in steel pipe piles, discharge ports with different height positions and orientations, etc.) Furthermore, it can be properly used depending on the type of fluid such as liquid (water) supply or gas (air) supply.

  The fluid is not limited to water or air, and any liquid or gas may be used, or a mixture of liquid and gas may be used.

In addition, it is needless to say that other specific detailed structures can be appropriately changed.
As described above, both the inner and outer communication holes 11 and the piping hole 12 are through holes formed in the side wall of the steel pipe pile 10, so that the plurality of through holes formed in the side wall of the steel pipe pile 10 are appropriately selected. The inner and outer communication holes 11 and the piping holes 12 can be used separately. For example, a plurality of steel pipe piles 10 can be manufactured in the same manner, and the piping holes 12 can be selected for each one, and therefore the rest can be selected as the internal / external communication holes 11. Adaptable response is possible.

[Steel pipe pile continuous wall]
When a continuous wall is constructed by press-fitting a plurality of steel pipe piles adjacent to the ground and continuously by the steel pipe pile and the press-fitting method described above, it is preferable to arrange through holes as follows.
That is, as shown in FIG. 8, and as described above, a pair of diagonal positions in which the through holes 11 including the inner and outer communication holes 11 (and 12 if provided) are opposed to each other via the central axis of the steel pipe pile 10. The steel pipe pile is installed on the ground so that the diagonal line connecting the pair of diagonal positions is along the continuous direction of the continuous wall. The center line L of the continuous wall shown in FIG. 8 is a line that indicates the continuous direction of the continuous wall and includes the diagonal line.
When the through holes 11 and (12) including the inner and outer communication holes 11 are limited to a pair of diagonal positions facing each other via the central axis of the steel pipe pile 10, the through holes are provided at other positions. In comparison with the above, it is possible to suppress a decrease in the rigidity of the steel pipe pile 10, and the inner and outer communication holes 11 required at the time of press-fitting work can be dispersed and arranged every 180 degrees. Above all, by arranging the steel pipe piles 10 in the direction shown in FIG. 8, through holes are formed in a portion where the bending stress that can be generated when the continuous wall receives a lateral load (a lateral load orthogonal to the center line L) is relatively small. The steel pipe pile continuous wall can be constructed in a high-strength structure.

DESCRIPTION OF SYMBOLS 1 Piping tip part 2 Pipe 3 Water supply pump 4 Cutting bit 5 Plate-like member 5a Small hole 10 Steel pipe pile 11 Inside / outside connecting hole 12 Piping hole e Discharge port

Claims (8)

A steel pipe pile pressed into the ground,
A pipe for fluid supply is attached,
A discharge port for fluids through the pipe is provided on the outer peripheral surface side of the steel pipe pile,
A plurality of internal and external communication holes penetrating the peripheral surface of the steel pipe pile are formed,
A part of the fluid discharged from the discharge port in the process of press-fitting construction is configured to flow upward along the inner and outer peripheral surfaces of the steel pipe pile through the inner and outer communication holes. Steel pipe pile.   The steel pipe pile according to claim 1, wherein the discharge ports are plural arranged at different heights along a central axis of the steel pipe pile. A steel pipe pile pressed into the ground,
A pipe for fluid supply is attached,
The discharge port of the fluid through the pipe is provided downward in the steel pipe pile, provided obliquely upward in the steel pipe pile, or provided obliquely downward in the steel pipe pile. Or provided inward from the tangential direction of the inner peripheral surface of the steel pipe pile in the steel pipe pile,
A plurality of internal and external communication holes penetrating the peripheral surface of the steel pipe pile are formed,
A part of the fluid discharged from the discharge port in the process of press-fitting construction is configured to flow upward along the inner and outer peripheral surfaces of the steel pipe pile through the inner and outer communication holes. Steel pipe pile.   The steel pipe pile according to any one of claims 1 to 3, wherein a plate-like member formed with a small hole communicating with the inner and outer communication holes is provided on the outer peripheral surface. A method for press-fitting a steel pipe pile, in which a pipe for fluid supply is attached, and a plurality of inner and outer communication holes are formed by penetrating the side surface, and press-fitted into the ground,
A discharge port for fluids through the pipe is provided on the outer peripheral surface side of the steel pipe pile,
In the process of rotationally press-fitting the steel pipe pile into the ground, a part of the fluid discharged from the discharge port passes through the inner and outer communication holes and flows upward along the inner and outer peripheral surfaces of the steel pipe pile. A method for press-fitting steel pipe piles. A method for press-fitting a steel pipe pile, in which a pipe for fluid supply is attached, and a plurality of inner and outer communication holes are formed by penetrating the side surface, and press-fitted into the ground,
The fluid outlet through the pipe is provided downward in the steel pipe pile, is provided obliquely upward in the steel pipe pile, is provided obliquely downward in the steel pipe pile, or Provided inward from the tangential direction of the inner peripheral surface of the steel pipe pile in the steel pipe pile,
In the process of rotationally press-fitting the steel pipe pile into the ground, a part of the fluid discharged from the discharge port passes through the inner and outer communication holes and flows upward along the inner and outer peripheral surfaces of the steel pipe pile. A method for press-fitting steel pipe piles. The through hole including the inner and outer communication holes is limited to a pair of diagonal positions opposed via the central axis of the steel pipe pile,
When constructing a continuous wall by press-fitting a plurality of the steel pipe piles adjacent to the ground, the steel pipe piles are placed on the ground so that diagonal lines connecting the pair of diagonal positions are along the continuous direction of the continuous walls. The method of press-fitting a steel pipe pile according to claim 5 or 6, wherein the method is installed. A steel pipe pile provided limited to a pair of diagonal positions where the through holes penetrating the side face through the central axis are adjacent to each other, and are continuous walls that are continuously installed on the ground,
The adjacent steel pipe piles are disconnected by the ground,
A steel pipe pile continuous wall in which the steel pipe pile is installed so that a diagonal line connecting the pair of diagonal positions is along the continuous direction of the continuous wall.

Images