JP2015113563A - Screw pile and burying method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screw pile that offers even greater bearing capacity.SOLUTION: A screw pile A comprises a hollow pile body 10 having a tip shaped like a pointed end of a cone, a spiral plate 13 installed spirally around the outer periphery of the tip side of the pile body 10, a first pile 1 installed on a side of the pile body 10 and has a through-hole 14 leading to the hollow part and an opening 11 for injecting cement milk into the hollow part, and a second pile 2 arranged in a way that may protrude from a side of the first pile 1. The second pile 2 also has a through-hole 24 leading to the hollow part of the first pile 1. When the screw pile A is buried, cement milk injected into the hollow part 12 is discharged into the ground from the through-holes 14 and 24. This solidifies the soil and forms a solidified lump integrated with the first pile 1 and the second pile 2. The solidified lump is formed to spread out on the lateral side of the first pile 1, thereby enhancing the bearing capacity of the screw pile A even more.

Description

  The present invention relates to a spiral pile and a burying method.

  In recent years, solar power generation systems have been built in various places. Conventionally, in order to fix a platform on which a solar cell panel is installed, a foundation is made by excavating the ground and placing concrete. Instead of this, in order to facilitate the work and shorten the construction period, there is a method in which a spiral pile (spiral pile) is directly driven into the ground and a gantry is fixed to the spiral pile (see Patent Document 1).

  In addition, a method has been proposed in which mortar is pressed into the soil from the through-holes on the side surfaces of the spiral pile and mortar lumps are formed to enhance the embedding support force (see Patent Document 2).

JP 2006-118336 A JP-A-1-230810

  Since it is desirable to install the solar cell panel so that the light receiving surface is as vertical as possible with respect to the incident light, it is generally installed with an inclination of about 30 ° with respect to the horizontal. By this inclination angle, the cross wind acts to lift the solar cell panel vertically upward. When a strong crosswind blows, a large force works vertically upward, exceeding the support capacity of the spiral pile, causing the spiral pile to fall out. When the mortar lump is formed on the side surface of the spiral pile, the embedding support force is enhanced, but the mortar lump is only formed in the vicinity of the periphery of the spiral pile, so it is weak against the force acting in the vertical upward direction.

  The present invention has been conceived under the circumstances described above, and an object of the present invention is to provide a spiral pile capable of increasing the supporting force.

  In order to solve the above problems, the present invention takes the following technical means.

  The spiral pile provided by the first aspect of the present invention includes a pile main body having a substantially conical tip shape and a hollow portion inside, and a spiral plate provided spirally on the outer periphery of the pile main body on the tip end side. And a central pile provided on a side surface of the pile body, including a through hole connected to the cavity, and a fluid for solidifying soil, and an injection part for injecting the cavity into the cavity, And a projecting member arranged to project from the side surface of the central pile, and the projecting member is also provided with a through hole connected to the cavity.

  In preferable embodiment of this invention, the said protrusion member is the same shape as the said center pile, It was inserted from the opening part provided in the rear end of the said center pile, and was provided in the side surface of the said center pile. It protrudes toward the front end side of the central pile from the hole.

  In a preferred embodiment of the present invention, a plurality of the protruding members are provided.

  In a preferred embodiment of the present invention, the fluid is cement milk.

  The embedding method provided by the second aspect of the present invention includes a pile main body having a substantially conical pointed tip and a hollow portion therein, and a spiral plate spirally provided on the outer periphery on the tip side of the pile main body. A first step of burying a central pile provided on a side surface of the pile body and having a through hole connected to the hollow portion in the ground by rotating in a circumferential direction of a central axis; and By injecting into the cavity the second step of projecting the projecting member provided with the connecting through hole from the hole provided in the side surface of the central pile and the fluid for solidifying the soil. And a third step of discharging into the ground from each through hole.

  In a preferred embodiment of the present invention, the protruding member has the same shape as the central pile, and the second step is a step of inserting the protruding member through an opening provided at a rear end of the central pile. Step 5 and a fifth step of burying in the ground from the hole provided on the side surface of the central pile toward the tip side of the central pile by rotating the protruding member in the circumferential direction of the central axis. And.

  According to the present invention, when the spiral pile according to the present invention is embedded and a fluid for solidifying the soil is injected into the cavity, the fluid is discharged from the through hole of the central pile into the ground. The fluid discharged into the ground consolidates the soil and forms a consolidated mass integrated with the central pile. Moreover, the said fluid is discharged in the ground also from the through-hole of the protrusion member protruded from the side surface of the center pile. Therefore, the formed solid lump is expanded in the lateral direction of the central pile. Thereby, the support force of a spiral pile can be enlarged more.

  Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

It is an external appearance perspective view for demonstrating the spiral pile concerning 1st Embodiment. It is sectional drawing of the 1st pile and 2nd pile which concern on 1st Embodiment. It is a figure for demonstrating the embedding method of the spiral pile which concerns on 1st Embodiment. It is sectional drawing for demonstrating another Example of the spiral pile which concerns on 1st Embodiment. It is sectional drawing for demonstrating another Example of the spiral pile which concerns on 1st Embodiment. It is sectional drawing for demonstrating the spiral pile which concerns on 2nd Embodiment. It is a figure for demonstrating the embedding method of the spiral pile which concerns on 2nd Embodiment. It is sectional drawing for demonstrating another Example of the spiral pile which concerns on 2nd Embodiment.

  Embodiments of the present invention will be specifically described below with reference to the drawings.

  Drawing 1 is an appearance perspective view for explaining spiral pile A concerning a 1st embodiment. The spiral pile A is embedded in the ground, for example, for fixing a frame of a solar cell panel. The spiral pile A includes a first pile 1, a second pile 2, and a bolt 3.

  Fig.2 (a) is for demonstrating the 1st pile 1, and is sectional drawing which follows the II-II line | wire shown in FIG. The first pile 1 includes a pile body 10, an opening 11, a cavity 12, a spiral plate 13, a through hole 14, a second pile hole 15, and a bolt hole 16. The first pile 1 is an example of a “center pile” according to the present invention.

  The pile main body 10 is a main body of the first pile 1 and has a cylindrical shape with a tip having a conical tip shape and an opening 11 provided at the rear end. The pile body 10 is formed by closing one end of a steel pipe in a conical shape. In addition, the manufacturing method of the pile main body 10 is not limited, You may form so that a cone-shaped member may adhere to the end of a steel pipe, and you may form by welding a board | plate material to a cone shape. Inside the pile body 10, a cavity portion 12 connected to the opening portion 11 is provided.

  The spiral plate 13 is a steel plate spirally provided on the outer periphery on the front end side of the pile body 10 and forms a thread on the pile body 10 (see FIG. 1). Thereby, the 1st pile 1 advances to a front-end | tip direction by turning the front-end | tip of the 1st pile 1 in the ground, and rotating in the circumferential direction (in the case of FIG. 1, clockwise) of the central axis of the 1st pile 1. And buried in the ground. In the present embodiment, the spiral plate 13 is provided from the tip of the pile body 10 to a position that is approximately half the length. The position where the spiral plate 13 is provided is not limited, and may be provided only up to a position closer to the tip, or may be provided up to the second pile hole 15.

  In addition, the material of the pile main body 10 and the spiral plate 13 is not limited, and may be stainless steel or aluminum. Moreover, it is not limited to a metal, Plastic and ceramic may be sufficient.

  The through holes 14 are a plurality of holes provided in the side surface of the pile body 10 and are connected to the cavity portion 12. The through holes 14 are arranged at equal intervals along the spiral plate 13 (see FIG. 1). In addition, the number of the through holes 14 and the positions where they are arranged are not limited. For example, you may make it arrange | position near the front-end | tip of the pile main body 10, and may arrange | position to the front of the hole 15 for 2nd piles. Moreover, it is not necessary to arrange | position the through-hole 14 equally, and you may arrange | position so that it may concentrate on the front end side of the pile main body 10.

  The second pile hole 15 is a hole for projecting the second pile 2 and is connected to the cavity portion 12. Two second pile holes 15 are arranged so as to face each other near the rear end of the side surface of the pile body 10. The 2nd pile hole 15 is provided according to the number of the 2nd piles 2 used. In the present embodiment, since two second piles 2 are used, two second pile holes 15 are provided. In addition, the position where the hole 15 for 2nd piles is arrange | positioned is not limited. For example, you may make it arrange | position to the front end side of the pile main body 10, and may arrange | position to the rear end side. Moreover, what is necessary is just to determine an arrangement position suitably according to the number to provide.

  The bolt hole 16 is a hole through which the bolt 3 is passed, and is connected to the cavity portion 12. Four bolt holes 16 are arranged near the rear end of the side surface of the pile body 10 at equal intervals. The bolt holes 16 are provided according to the number of bolts 3 used. In this embodiment, since four bolts 3 are used, four bolt holes 16 are provided. In addition, although the position where the hole 16 for bolts is arrange | positioned is not limited, it is necessary to arrange | position to the part which comes out on the ground when the 1st pile 1 is embed | buried in the ground.

  FIG.2 (b) is for demonstrating the 2nd pile 2, and is sectional drawing similar to the figure (a). After the first pile 1 is buried in the ground, the second pile 2 is inserted from the opening 11 of the first pile, and from the second pile hole 15 toward the tip of the first pile 1, It is buried in The second pile 2 is obtained by reducing the first pile 1 and includes a pile body 20, an opening 21, a cavity 22, a spiral plate 23, and a through hole 24. The second pile 2 is an example of the “projection member” according to the present invention.

  The pile main body 20 is a main body of the second pile 2 and has a cylindrical shape in which the tip has a conical tip shape and the opening 21 is provided at the rear end. The pile body 20 is formed by closing one end of a steel pipe in a conical shape. In addition, the manufacturing method of the pile main body 20 is not limited. Inside the pile body 20, a cavity portion 22 connected to the opening 21 is provided.

  The spiral plate 23 is a steel plate spirally provided on the outer periphery on the front end side of the pile body 20, and forms a thread on the pile body 20 (see FIG. 1). Thereby, the front-end | tip of the 2nd pile 2 is rotated in the circumferential direction (in the case of FIG. 1 clockwise) of the central axis of the 2nd pile 2 toward the underground from the hole 15 for 2nd piles of the 1st pile 1. Thus, the second pile 2 proceeds in the distal direction and is buried in the ground. In the present embodiment, the spiral plate 23 is provided from the tip of the pile body 20 to a position that is approximately half the length. The position where the spiral plate 23 is provided is not limited. Moreover, the material of the pile main body 20 and the spiral plate 23 is not limited.

  The through holes 24 are a plurality of holes provided in the side surface of the pile body 20 and are connected to the cavity portion 22. The through holes 24 are arranged at equal intervals along the spiral plate 23 (see FIG. 1). The number of through holes 24 and the positions where they are arranged are not limited. When the second pile 2 is protruded from the second pile hole 15 of the first pile 1 (see FIG. 1), the cavity portion 22 of the second pile 2 is connected to the cavity portion 12 of the first pile 1, The hole 24 is also connected to the cavity 12 of the first pile 1.

  The bolt 3 fixes the support | pillar B (refer FIG.3 (d)) inserted from the opening part 11 of the 1st pile 1. FIG. In this embodiment, the column B is fixed using four bolts 3. The number of bolts used for fixing is not limited to this.

  Next, a method for burying the spiral pile A will be described with reference to FIG.

  Fig.3 (a) has shown the state which embed | buried the 1st pile 1 in the ground. The first pile 1 is buried up to the second pile hole 15 (rear end side). The first pile 1 is buried in the ground by turning the tip of the first pile 1 toward the ground so that the central axis of the first pile 1 is substantially perpendicular to the ground and rotating in the circumferential direction of the central axis. The The embedding of the first pile 1 may be performed by a small pile driving machine, or may be performed manually by using a pile driving tool. In addition, since the magnitude | size of the spiral pile A will also become large if the spiral pile A is used in order to fix the support | pillar of a building, in this case, so that the 1st pile 1 may be buried with the pile driver for construction do it. In addition, the 1st pile 1 does not necessarily need to be embed | buried substantially perpendicularly with respect to the ground. For example, when the ground is inclined, it may be embedded with being inclined with respect to the ground.

  FIG.3 (b) has shown the state which embed | buried one 2nd pile 2 (left side of a figure) in the ground, and pierced the front-end | tip of the other 2nd pile 2 (right side of a figure) in the ground. Each 2nd pile 2 is inserted from the opening part 11 of the 1st pile 1, and is embed | buried in the ground toward the front-end | tip direction of the 1st pile 1 from the hole 15 for 2nd piles. The 2nd pile 2 is embed | buried in the ground by rotating the front-end | tip part to the ground exposed to the hole 15 for 2nd piles in the circumferential direction of the central axis of the 2nd pile 2. As shown in FIG. The embedding of the second pile 2 may also be performed by a small pile driving machine, or may be performed manually using a pile driving tool. Moreover, you may carry out with the pile driver for construction.

  FIG. 3C shows a state in which both the second piles 2 are buried in the ground, and the cement milk 4 is injected into the hollow portion 12 from the opening 11 of the first pile 1. The cement milk 4 is a milk-like product made by kneading cement and water. The cement milk 4 is pressurized and injected by a liquid pumping device (not shown) through a pipe attached to the opening 11. In addition, in this embodiment, although cement milk is inject | poured, it is not restricted to this. Any material may be used as long as it is discharged into the ground and solidifies the soil. For example, mortar, water glass, and other solidifying agents may be used. Because it pressurizes and penetrates the soil, a low viscosity liquid is desirable and cement milk is suitable. In FIG.3 (c), the cement milk 4 inject | poured into the cavity part 12 is discharged in the ground from the through-hole 14 of the front end side of the 1st pile 1. FIG.

  FIG. 3 (d) shows a state in which, after injecting an appropriate amount of cement milk 4, the injection is stopped, the support B is inserted from the opening 11 and fixed with the bolt 3. In FIG.3 (d), the cement milk 4 inject | poured into the cavity part 12 is discharged in the ground from the through-hole 14 of the 1st pile 1, and the through-hole 24 of the 2nd pile 2, and solidifies soil. A solidified lump 4 ′ integrated with the first pile 1 and the second pile 2 is formed.

  In the present embodiment, when the spiral pile A is embedded and the cement milk 4 is injected into the cavity 12, the cement milk 4 is discharged from the through holes 14 of the first pile 1 into the ground. Further, the cement milk 4 is injected from the cavity portion 12 into the cavity portion 22 of the second pile 2 and is also discharged into the ground from the through holes 24. The cement milk 4 discharged into the ground consolidates the soil to form a consolidated lump 4 ′ integrated with the first pile 1 and the second pile 2. The 2nd pile 2 is embed | buried so that it may protrude in the ground from the hole 15 for 2nd piles provided in the side surface of the 1st pile 1. FIG. Therefore, the consolidated lump 4 ′ is formed in a shape spreading to the side surface side of the first pile 1. Thereby, the supporting force of spiral pile A can be made larger than the conventional spiral pile.

  When the support column of the solar cell panel is fixed to the spiral pile A, the support force against the force acting in the vertical upward direction is larger than that of the conventional spiral pile by the consolidated lump 4 '. Therefore, even if a large vertical force acts on the solar cell panel, the spiral pile A can be prevented from coming off.

  Moreover, the spiral pile A is effective also when fixing things other than the stand of a solar cell panel. Since the spiral pile A has a larger supporting force against the force acting in the vertically downward direction than the conventional spiral pile, the heavier pile than the conventional spiral pile can be fixed and supported. Further, since the spiral pile A has a larger supporting force than the conventional spiral pile due to the caulking lump 4 ′, the direction of the center axis is inclined or rotated, for example, a parabolic antenna for receiving satellite radio waves This is also effective when the column is fixed and supported, although it should be prevented from changing.

  The consolidated lump 4 ′ includes the second pile 2 inside and has the same structure as that in which the reinforcing bar is put into the concrete, so that the tensile strength is strengthened and it is cracked by drying or shrinking. It is suppressed. Moreover, since the cement milk 4 is alkaline, it neutralizes acidic soil. Therefore, it can suppress that the spiral pile A embed | buried in the ground rusts by oxidation.

  In addition, in this embodiment, although the case where two 2nd piles 2 were used was demonstrated, it is not restricted to this. The number of second piles 2 to be used may be one or three or more. The more it is used, the greater the above effect.

  In this embodiment, although the case where the support | pillar B was inserted from the opening part 11 of the 1st pile 1 and fixed with the volt | bolt 3 was demonstrated, the method of fixing the support | pillar B to the spiral pile A is not restricted to this. For example, a flange 17 may be provided at the rear end portion of the first pile 1 and the flange of the column B and the flange 17 may be fixed with the bolt 3 and the nut 6 (see FIG. 4).

  In this embodiment, although the case where the cavity part 12 was provided over the whole pile main body 10 was demonstrated, it is not restricted to this. Since the cavity 12 and the through-hole 14 only need to be connected, the cavity 12 is made under the second pile hole 15 of the pile body 10, and the cavity 12 and the through-hole 14 are formed inside the pile body 10. A connecting passage may be provided (see FIG. 5A). Moreover, you may make it connect the cavity part 12 and the through-hole 14 with a hose etc. (refer FIG.5 (b)).

  Although the said 1st Embodiment demonstrated the case where the 2nd pile 2 which carried out the shape similar to the 1st pile 1 was used, it is not restricted to this. Instead of the second pile 2, another structure that protrudes from the side surface of the first pile 1 may be used.

  FIG. 6A is a cross-sectional view for explaining a spiral pile A ′ according to the second embodiment. In Fig.6 (a), the same code | symbol is attached | subjected to the same or similar element as the spiral pile A (refer FIG. 2) which concerns on 1st Embodiment.

  The spiral pile A ′ according to the second embodiment is different from the second pile hole 15 and the second pile 2 in that the projecting member hole 18 and the projecting member 5 are provided in the first pile 1. Different from the spiral pile A according to the embodiment.

  The projecting member hole 18 is a hole for projecting the projecting member 5, and is connected to the cavity 12. The plurality of projecting member holes 18 are arranged at equal intervals in the vicinity of the middle between the front end portion and the rear end portion of the side surface of the pile body 10. The protruding member holes 18 are provided in accordance with the number of protruding members 5 used. In the present embodiment, since several tens of projecting members 5 are used, the number of projecting member holes 18 is provided. The position where the protruding member hole 18 is arranged is not limited. However, since the length of the projecting member 5 provided in the central axis direction is shortened toward the front end side of the pile main body 10, it is not necessary to provide the protrusion member 5 on the front end side. What is necessary is just to determine an arrangement position suitably according to the number to provide.

  The protruding member 5 is protruded from the protruding member hole 18 into the ground after the first pile 1 is buried in the ground. FIG. 6B is a cross-sectional view for explaining the protruding member 5. The protruding member 5 includes a main body 50, an opening 51, a cavity 52, and a through hole 54. The protruding member 5 is an example of the “projecting member” according to the present invention.

  The main body 50 is a main body of the protruding member 5 and has a cylindrical shape in which the tip has a conical pointed shape and the opening 51 is provided at the rear end. The rear end of the main body 50 is provided with an inclination. The length of the main body 50 in the central axis direction differs depending on the position of the protruding member hole 18 of the first pile 1 and is longer as it is arranged on the rear end side of the first pile 1. . The main body 50 is formed by narrowing one end of a thin steel pipe into a conical shape and closing it. In addition, the manufacturing method of the main body 50 is not limited. A hollow portion 52 connected to the opening 51 is provided inside the main body 50.

  The through holes 54 are a plurality of holes provided on the side surface of the main body 50, and are connected to the cavity 52. The number of the through holes 54 differs depending on the position of the protruding member hole 18 in the first pile 1, and the number of the through holes 54 increases as the number of the through holes 54 is arranged on the rear end side of the first pile 1. The cavity 52 of the protruding member 5 is connected to the cavity 12 of the first pile 1, and each through hole 54 is also connected to the cavity 12 of the first pile 1.

  Each projecting member 5 is disposed in each projecting member hole 18 of the first pile 1 so that the front end portion faces outward and the central axis is aligned. Each protruding member 5 is movable in the central axis direction, and is arranged in a state where the tip does not protrude from the side surface of the first pile 1.

  Next, a method for burying the spiral pile A ′ will be described with reference to FIG. 7.

  Fig.7 (a) has shown the state which embed | buried the 1st pile 1 in the ground. The embedding method of the first pile 1 is the same as the embedding method of the first pile 1 of the spiral pile A according to the first embodiment. FIG. 7A shows a state where the tip of the pin C is inserted from the opening 11 of the first pile 1. The pin C is inserted in the direction of the arrow shown in the figure.

  FIG. 7B shows a state in which the pin C is inserted to the tip side of the first pile 1. Each projecting member 5 is moved outward from each projecting member hole 18 of the first pile 1 with its rear end being pushed by the side surface of the pin C, and is substantially vertically oriented from the central axis of the first pile 1. It protrudes inside.

  FIG. 7 (c) shows a state where the pin C is pulled out and cement milk 4 is injected from the opening 11 of the first pile 1 into the cavity 12. In FIG.7 (c), the cement milk 4 inject | poured into the cavity part 12 is discharged in the ground from the through-hole 14 of the 1st pile 1, and the through-hole 54 of the protrusion member 5. FIG.

  FIG. 7 (d) shows a state in which, after injecting an appropriate amount of cement milk 4, the injection is stopped, the support B is inserted from the opening 11 and fixed with the bolt 3. In FIG.7 (d), the cement milk 4 inject | poured into the cavity part 12 and discharged in the ground from the through-hole 14 and the through-hole 54 consolidated the soil, and united with the 1st pile 1 and the protrusion member 5. In FIG. A solidified lump 4 'is formed.

  Also in the second embodiment, since the consolidated lump 4 ′ is formed in a shape spreading toward the side surface of the first pile 1, the supporting force of the spiral pile A ′ can be made larger than that of the conventional spiral pile. Therefore, also in 2nd Embodiment, there can exist an effect similar to 1st Embodiment.

  Also in the second embodiment, as in the example of the first embodiment (see FIG. 4), the column B may be fixed to the spiral pile A ′ by another method.

  Moreover, in 2nd Embodiment, although the case where the protrusion member 5 protrudes in a substantially perpendicular direction with respect to the central axis of the 1st pile 1 was demonstrated, it is not restricted to this. For example, as shown in FIG. 8, the protruding member 5 may protrude toward the distal end direction of the first pile 1. In this case, the length of the protruding member 5 in the central axis direction can be further increased.

  Moreover, in 2nd Embodiment, although the case where each protrusion member 5 was extruded with the side surface of the pin C inserted from the opening part 11 of the 1st pile 1 was demonstrated, it is not restricted to this. For example, screw grooves may be provided on the inner side of the protruding member hole 18 and the side surface of the protruding member 5, and the protruding member 5 may be rotated to protrude into the ground.

  The spiral pile and the burying method according to the present invention are not limited to the above-described embodiment. The specific configuration of each part of the spiral pile and the embedding method according to the present invention can be varied in design in various ways.

A, A 'Spiral pile 1 First pile (central pile)
10 Pile body 11 Opening (injection part)
12 Cavity 13 Spiral Plate 14 Through Hole 15 Second Pile Hole (Hole)
16 Bolt hole 17 Flange 18 Projection member hole (hole)
2 Second pile (protruding member)
DESCRIPTION OF SYMBOLS 20 Pile main body 21 Opening part 22 Cavity part 23 Spiral plate 24 Through-hole 3 Bolt 4 Cement milk 4 'Solidified mass 5 Protruding member 54 Through-hole 6 Nut B Post C Pin

Claims (6)

A pile body having a substantially conical tip at the tip and a hollow portion inside,
A spiral plate spirally provided on the outer periphery of the front end side of the pile body;
Provided on the side surface of the pile body, and a through hole connected to the cavity,
An injection part for injecting a fluid for solidifying the soil into the cavity,
A central pile comprising:
A projecting member arranged to project from the side surface of the central pile;
With
The projecting member is also provided with a through hole that leads to the cavity,
Spiral pile characterized by that. The protruding member is
It is the same shape as the central pile,
Inserted from the opening provided at the rear end of the central pile, and projecting toward the tip side of the central pile from the hole provided in the side surface of the central pile,
The spiral pile according to claim 1. A plurality of the protruding members are provided;
The spiral pile according to claim 1 or 2. The fluid is cement milk;
The spiral pile according to any one of claims 1 to 3. A pile main body having a substantially conical pointed tip and a hollow portion inside, a spiral plate spirally provided on the outer periphery on the tip side of the pile main body, and provided on a side surface of the pile main body, A first step of burying a central pile including a connecting through hole in the ground by rotating in a circumferential direction of the central axis;
A second step of causing a protruding member provided with a through hole connected to the hollow portion to protrude from a hole provided on a side surface of the central pile;
A third step of injecting a fluid for consolidating the soil into the cavity to discharge the fluid from the through holes into the ground;
An embedding method characterized by comprising: The protruding member has the same shape as the central pile,
The second step includes
A fourth step of inserting the protruding member from an opening provided at the rear end of the central pile;
By rotating the projecting member in the circumferential direction of the central axis, from the hole provided on the side surface of the central pile toward the tip side of the central pile, a fifth step,
With
The embedding method according to claim 5.

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