Pile body, pile body connection structure, steel pipe pile, connection structure with foundation of building, and steel pipe pile embedding method

Abstract

To provide a pile body which is extremely easy to connect, is hard to deform, and is manufactured at low cost.SOLUTION: A pile body of a steel pipe pile comprises a pile body and a blade provided at a tip of the pile body, and comprises a steel pipe section, a flange section disposed on at least one end of the steel pipe section, and a reinforcing section connecting a flange section and one end of the steel pipe section. An outer diameter of the flange section exceeds an outer diameter of the steel pipe section and is equal to or smaller than an outer diameter of the blade. The thickness of the reinforcing section exceeds the thickness of the steel pipe section and is equal to or smaller than the thickness of the flange. The length of the reinforcing section in the direction along the extension of the steel pipe section is equal to or larger than 20% of the outer diameter of the steel pipe section and is equal to or smaller than 50% of the outer diameter of the steel pipe section.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a pile body to be drilled into the ground, a connecting structure for the pile body, a steel pipe pile, a connecting structure for connecting the foundation of a building and the pile body, and a method for embedding a steel pipe pile. [Background technology]

[0002] Steel pipe piles are used as foundations for buildings and other structures. However, due to restrictions on pile length imposed by the machines used to install them, restrictions on storage space at the construction site, and restrictions on length during transportation, the length of the pile itself is limited to, for example, 6 to 8 meters. For lengths exceeding this, piles are added one after another as they are drilled into the ground. The bottom end of a subsequent pile is connected to the top end of a previously buried pile. Conventionally, this connection has been made by welding.

[0003] However, welding requires a power source, a generator, etc., which increases costs. In addition, welding requires skilled welding engineers, which increases costs.

[0004] For this reason, it was considered to form a flange on the top end of the lower foundation pile and a flange on the bottom end of the upper foundation pile, and then butt the top flange and the bottom flange together and fasten them with bolts, as described in Patent Document 1. This makes it easy to connect the piles to be added on site. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-302940 Summary of the Invention [Problem to be solved by the invention]

[0006] However, when a pile is excavated, it rotates while being pressed, and a large rotational torque and bending moment are applied to it. Not only during excavation but also when it is used as a foundation, the part where the flanges are connected is particularly rigid than the pipe part of the pile, and due to this difference in rigidity, a large bending moment occurs at the fixed end at the boundary between the flange and the pipe part of the pile.

[0007] Therefore, simply butting the upper flange with the lower flange and fastening them with bolts could cause deformation of the pile near the connecting part. Also, increasing the rigidity of the entire pile would increase manufacturing costs.

[0008] The present invention has been made in consideration of the above-mentioned problems of the prior art, and its object is to provide a pile body, a connecting structure for the pile body, a connecting structure for a steel pipe pile and a foundation for a building, and a method for burying a steel pipe pile, which are extremely easy to connect, resistant to deformation, and inexpensive to manufacture. [Means for solving the problem]

[0009] According to the first aspect of the pile body of the present invention, the pile body of a steel pipe pile comprises a pile body and a blade provided at the tip of the pile body, and comprises a steel pipe portion, a flange portion arranged on at least one end of the steel pipe portion, and a reinforcing portion connecting the flange portion and one end of the steel pipe portion.

[0010] Furthermore, the outer diameter of the flange portion exceeds the outer diameter of the steel pipe portion and is equal to or smaller than the outer diameter of the blade, the thickness of the reinforcing portion exceeds the thickness of the steel pipe portion and is equal to or smaller than the thickness of the flange, and the length of the reinforcing portion in the direction along which the steel pipe portion extends is equal to or larger than 20% of the outer diameter of the steel pipe portion and is equal to or smaller than 50% of the outer diameter of the steel pipe portion.

[0011] Since the outer diameter of the flange exceeds that of the steel pipe, the flange can be easily connected to the steel pipe over its entire circumference in the radial direction. Furthermore, by making the outer diameter of the flange equal to or smaller than the outer diameter of the blade, the flange does not interfere with excavation work.

[0012] The thickness of the reinforcement section exceeds that of the steel pipe section, which effectively improves the strength of the flange area, which is subject to large bending moments. It also prevents excess material from being removed, which would otherwise result in excessive reinforcement.

[0013] By making the length of the reinforcement section at least 20% and no more than 50% of the outer diameter of the steel pipe section, excess material can be prevented from being removed, and the areas where loads are concentrated and prone to deformation can be effectively reinforced.

[0014] According to the pile body of the second aspect of the present invention, in the pile body of the first aspect, a plate-like lid portion is interposed between the reinforcing portion and the steel pipe portion.

[0015] This makes it possible to easily manufacture concrete-filled piles or mortar-filled piles by injecting concrete or mortar into the hollow portion of the steel pipe section.

[0016] According to a third aspect of the present invention, in the pile body of the first aspect, the flange portion is an annular plate member. This allows the flange portion to be made lighter in weight.

[0017] According to the fourth aspect of the pile body of the present invention, in the pile body of the third aspect, axial holes are formed in the flange portion evenly spaced circumferentially and at equal positions from the central axis of the pile body.

[0018] This allows the flange portion to be fastened evenly by passing bolts or the like through holes that are evenly provided in the circumferential direction.

[0019] According to the fifth aspect of the pile body connection structure of the present invention, in the pile body of the fourth aspect, the connection structure with the second pile body is the same as that with the first pile body, and the first and second flange portions are mechanically connected by passing a connector through holes in the first flange portion of the first pile body and the second flange portion of the second pile body, which are opposed to each other.

[0020] According to this, the first and second flange portions are quickly and reliably connected by passing a connector through the hole in the first flange portion of the first pile body and the hole in the second flange portion of the second pile body.

[0021] According to the sixth aspect of the pile body connection structure of the present invention, in the fifth aspect of the pile body connection structure, an expanded diameter portion is interposed between the first flange portion and the second flange portion, and the outer diameter of the expanded diameter portion exceeds the outer diameters of the first flange portion and the second flange portion and is equal to or smaller than the outer diameter of the blade.

[0022] According to this, if a hard layer exists in the middle of the excavated hole, the bearing capacity of the pile can be improved by aligning the expanded diameter section with the hard layer. Furthermore, since the expanded diameter section can be attached simply by sandwiching it between the first flange section and the second flange section, it can be done quickly and easily as needed.

[0023] According to the seventh aspect of the connection structure of the pile body of the present invention, the connection structure with the second pile body is the same as that of the first pile body of the first aspect, and the outer diameter of the steel pipe portion of the second pile body located on the upper side exceeds the outer diameter of the steel pipe portion of the first pile body.

[0024] This allows the first pile body and the second pile body, which have different outer diameters, to be reliably and easily connected by the flange.

[0025] According to an eighth aspect of the present invention, there is provided a steel pipe pile having the pile body of the second aspect, wherein the steel pipe portion is filled with concrete or mortar.

[0026] According to this, by filling the piles with concrete or mortar, the concrete or mortar piles can be wrapped in steel pipes, resulting in piles with excellent earthquake resistance.

[0027] According to the ninth aspect of the present invention, the connection structure with the foundation of a building is a connection structure between a steel pipe pile having a pile body and the foundation of a building above it, in which the reinforcing steel bars of the building are fixed to the flange portion, in the pile body of the first aspect.

[0028] With this, by fixing the reinforcing steel bars of the building to the flange portion, the foundation of the building can be firmly and quickly connected to the steel pipe pile.

[0029] According to a tenth aspect of the pile body of the present invention, the pile body of a steel pipe pile comprises a pile body and a blade provided at the tip of the pile body, and comprises a steel pipe portion, a flange portion arranged on at least one end of the steel pipe portion, and a reinforcing portion connecting the flange portion and one end of the steel pipe portion, and the reinforcing portion is a rib welded to the flange portion and the peripheral surface of the steel pipe portion.

[0030] With this, the ribs welded to the flange portion and the circumferential surface of the steel pipe portion can simply and effectively reinforce the portion where loads are concentrated and which is prone to plastic deformation.

[0031] According to an eleventh aspect of the method for burying a steel pipe pile, an attachment is prepared, which comprises a receiving pipe portion that is shorter than the steel pipe portion of the pile body and has a key attached to its peripheral surface, a receiving flange portion that is positioned at one end of the receiving pipe portion, and a receiving reinforcement portion that connects the receiving flange portion to one end of the receiving pipe portion.

[0032] The outer diameter of the receiving flange portion exceeds the outer diameter of the receiving pipe portion and is equal to or smaller than the outer diameter of the blade, and the receiving flange portion of the attachment is connected to the flange portion at the end of the pile body that protrudes from the ground, and the receiving pipe portion is attached to an auger and rotated and pressed in.

[0033] This allows the pile body provided with the flange portion to be attached to the auger easily and quickly using the attachment. [Brief explanation of the drawings]

[0034] [Figure 1] 1 is a front view showing a part of a cross section of a first embodiment of a pile body of the present invention.

[0022] FIG. [Figure 2] FIG. 4 is a schematic view of a first flange portion viewed from above. [Figure 3] FIG. 10 is a diagram showing a state in which the first pile body and the second pile body are opposed to each other. [Figure 4] FIG. 10 is a diagram showing the state in which the first pile body and the second pile body are connected. [Figure 5] FIG. 10 is a front view showing a second embodiment. [Figure 6] FIG. 10 is a front view showing a third embodiment. [Figure 7] FIG. 10 is a front view showing a fourth embodiment. [Figure 8] FIG. 10 is a diagram showing a state in which concrete is filled into the connected pile bodies of the fifth embodiment. [Figure 9] FIG. 13 is a diagram showing a structure for connecting to the foundation of a building in the sixth embodiment. [Figure 10] FIG. 13 is a front view of a seventh embodiment in which the reinforcing portion is a rib. [Figure 11] FIG. 13 is a plan view showing a lower pile body in the seventh embodiment. [Figure 12] FIG. 13 is a front view showing the connection state of the attachment and the pile body used in the eighth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0035] (First embodiment) A first embodiment of a pile body according to the present invention will be described below with reference to FIGS. When there is a structure, an imaginary center line is considered for the structure, and the side closer to the center line is called the "inside" and the side farther from the center line is called the "outside."

[0036] The pile body 1 in this embodiment is used in a rotary pile construction method. A rotational force is applied to a steel pipe pile (pile body 1) having a blade 2 at its tip, and the pile body 1 is driven into the ground.

[0037] The blades 2 at the tip not only generate propulsive force by rotation during construction, but also act as a base expansion member to provide a larger support area than the steel pipe pile (pile body 1). The pile body 1 of the first embodiment includes a lower first pile body 1a and an upper second pile body 1b, as shown in Fig. 1. The first pile body 1a and the second pile body 1b have the same structure at the connecting portion, so the first pile body 1a will be described below as a representative example.

[0038] (First pile body) The first pile body 1a includes a steel pipe portion 3, a reinforcing portion 4, and a first flange portion 5a. (Steel pipe section) The steel pipe portion 3 is made of, for example, iron and formed into a cylindrical shape. In this embodiment, the steel pipe portion 3 has an outer diameter D3 of, for example, 600 mm. The thickness t3 of the steel pipe portion 3 is, for example, 20 mm. A reinforcing portion 4 is provided at the upper end of the steel pipe portion 3 .

[0039] (reinforcement part) The reinforcing portion 4 is made of iron and formed into a cylindrical shape, and has a thickness t4 of 50 mm and a length h4 of 70 mm, for example. The reinforcing portion 4 is pre-connected to the steel pipe portion 3 by welding at the factory. The reinforcing portion 4 has an upper end provided with a first flange portion 5a.

[0040] (First flange part) The first flange portion 5a is formed of, for example, an annular iron plate member, as shown in Fig. 2. The first flange portion 5a has an outer diameter D5 of, for example, 900 mm and a thickness t5 of, for example, 60 mm.

[0041] The first flange portion 5a has a plurality of (for example, 14 in this embodiment) axial mounting holes 51 formed evenly in the circumferential direction and at equal positions from the central axis CL of the first pile main body 1a, as shown in Figures 2 and 3. The first flange portion 5a is pre-connected to the reinforcing portion 4 by welding at the factory.

[0042] An excavation blade 2 is provided at the lower end of the steel pipe portion 3. The blade 2 has an outer diameter D2 of, for example, 1200 mm. The blade 2 is a known technique, and therefore a description thereof will be omitted. The first pile body 1a is connected to the second pile body 1b.

[0043] (connected structure) The structure in which the first pile body 1a is connected to a similar second pile body 1b will be described below. When the length of the first pile body 1a alone is not enough to reach the bearing layer of the ground at an excavation site, piles are extended.

[0044] As shown in Figure 4, the connecting structure is such that the first and second flange portions 5a, 5b are mechanically connected to the mounting holes 51 of the first flange portion 5a of the first pile body 1a and the second flange portion 5b of the second pile body 1b, which face each other, through connectors (bolts B and nuts N).

[0045] (Connection work) In the connecting work, the second flange portion 5b of the second pile main body 1b, which has been raised vertically by, for example, a crawler crane, is brought to face the first flange portion 5a of the buried first pile main body 1a. Next, the mounting holes 51 of the first flange portion 5a and the mounting holes 51 of the second flange portion 5b are aligned so as to communicate with each other. Next, a bolt B is inserted into the communicating mounting hole 51 from below, and the tip end is fastened with a nut N. In this way, the connection can be performed more easily and quickly than by welding at the excavation site. The first pile body 1a and the second pile body 1b connected together are attached to, for example, a full-circle rotating machine and are rotationally pressed into the ground.

[0046] As is clear from the above description, the pile body 1 of the first embodiment of the present invention is a steel pipe pile body 1 comprising a first pile body 1a and a blade 2 provided at the tip of the first pile body 1a. The first pile body 1a comprises a steel pipe portion 3, a first flange portion 5a arranged at at least one end of the steel pipe portion 3, and a reinforcing portion 4 connecting the first flange portion 5a and one end of the steel pipe portion 3.

[0047] The outer diameter D5 of the first flange portion 5a exceeds the outer diameter D3 of the steel pipe portion 3 and is not greater than the outer diameter D2 of the blade 2, the thickness t4 of the reinforcing portion 4 exceeds the thickness t3 of the steel pipe portion 3 and is not greater than the thickness t5 of the first flange portion 5a, and the length h4 of the reinforcing portion 4 in the direction along which the steel pipe portion 3 extends is not less than 20% of the outer diameter D3 of the steel pipe portion 3 and not greater than 50% of the outer diameter D3 of the steel pipe portion 3.

[0048] According to this, the outer diameter D5 of the first flange portion 5a exceeds the outer diameter D3 of the steel pipe portion 3, and therefore, connection can be made extremely easily by the first flange portion 5a which protrudes radially over the entire circumference from the steel pipe portion 3. Furthermore, by making the outer diameter D5 of the first flange portion 5a equal to or smaller than the outer diameter D2 of the blade 2, the first flange portion 5a does not interfere with excavation work.

[0049] The thickness t4 of the reinforcing portion 4 exceeds the thickness t3 of the steel pipe portion 3, which effectively improves the strength of the first flange portion 5a and its vicinity, which is subjected to a large bending moment. In addition, it is possible to prevent excess material from being removed, which would result in excessive reinforcement.

[0050] By setting the length h4 of the reinforcing section 4 to be at least 20% of the outer diameter D3 of the steel pipe section 3 and at most 50% of the outer diameter D3 of the steel pipe section 3, it is possible to prevent excess material from being removed and effectively reinforce the areas where loads are concentrated and which are prone to plastic deformation.

[0051] In the first pile body 1a, the first flange portion 5a is an annular plate member. This allows the weight of the first flange portion 5a to be reduced.

[0052] Furthermore, the first flange portion 5a has axial holes (mounting holes 51) formed at equal intervals in the circumferential direction and at equal positions from the central axis CL of the first pile main body 1a.

[0053] According to this, the first flange portion 5a can be fastened evenly by passing connecting tools such as bolts B through the mounting holes 51 provided evenly in the circumferential direction.

[0054] In addition, the pile body 1 has a connecting structure with a second pile body 1b which is configured in the same way as the first pile body 1a, and the first and second flange portions 5a and 5b are mechanically connected to the mounting holes 51 of the first flange portion 5a of the first pile body 1a and the second flange portion 5b of the second pile body 1b which face each other through connecting devices such as bolts B and nuts N.

[0055] According to this, the first and second flange portions 5a and 5b can be easily and quickly joined by passing connecting devices such as bolts B and nuts N through the mounting holes 51 of the first flange portion 5a of the first pile body 1a and the mounting holes 51 of the second flange portion 5b of the second pile body 1b.

[0056] Second Embodiment Next, a second embodiment of the pile body 101 of the present invention will be described below with reference to FIG. As shown in FIG. 5, in the pile main body 1 of this embodiment, a plate-shaped lid portion 106 is interposed between the reinforcing portion 4 and the steel pipe portion 3 in the upper second pile main body 1b. The plate-shaped lid portion 106 is made of, for example, iron and formed into a disk-shaped plate material. The plate-shaped lid portion 106 is formed to have the same outer diameter as the steel pipe portion 3 and is joined to the steel pipe portion 3 and the reinforcing portion 4 by factory welding. The other configurations are the same as those of the first embodiment, so explanations will be omitted.

[0057] This makes it possible to easily manufacture a concrete-filled pile or a mortar-filled pile by pouring concrete or mortar into the hollow portion of the steel pipe portion 3 of the upper second pile body 1b.

[0058] (Third embodiment) Next, a third embodiment of the pile body 201 of the present invention will be described below with reference to FIG. As shown in FIG. 6, in the pile body of the third embodiment, an enlarged diameter portion 202 is sandwiched and connected between a first flange portion 5a and a second flange portion 5b.

[0059] The expanded diameter portion 202 is formed, for example, from a disk-shaped iron plate, and has a plurality of through holes 2021 formed therein that correspond to the mounting holes 51 of the first flange portion 5a and the second flange portion 5b. The outer diameter D20 of the expanded diameter portion 202 is formed to be, for example, 1000 mm, which is greater than the outer diameter D5 of the first flange portion 5a and the second flange portion 5b, which is 900 mm, and is equal to or smaller than the outer diameter D2 of the blade 2, which is 1200 mm.

[0060] According to this, if a hard layer exists in the middle layer of the excavated hole, the bearing capacity of the pile can be improved by arranging the enlarged diameter portion 202 to fit the hard layer. In addition, since the enlarged diameter portion 202 can be attached simply by sandwiching it between the first flange portion 5a and the second flange portion 5b, it can be done quickly and easily as needed.

[0061] (Fourth embodiment) Next, a fourth embodiment of the pile body 301 of the present invention will be described below with reference to FIG. As shown in Figure 7, the fourth embodiment shows a connecting structure for two piles, one above the other, whose steel pipe portions have different outer diameters. The outer diameter D33b of the steel pipe portion 303b of the second pile body 301b, which is located on the upper side, is larger than the outer diameter D33a of the steel pipe portion 303a of the first pile body 301a, which is located on the lower side. The outer diameter D35b of the second flange portion 305b of the second pile body 301b is formed to be the same size as the outer diameter D35a of the first flange portion 305a of the first pile body 301a.

[0062] Furthermore, the number and arrangement of mounting holes 51 formed in both flange portions 305a, 305b are the same. Therefore, first flange portion 305a and second flange portion 305b can be fastened together with bolts B and nuts N.

[0063] Even if the outer diameter D33b of the steel pipe portion 303b of the second pile body 301b located above is larger than the outer diameter of the steel pipe portion 333a of the first pile body 301a, the pile bodies 301a and 301b can be easily and reliably connected as long as the flange portions 305a and 305b can be connected to each other.

[0064] Fifth Embodiment Next, a fifth embodiment of the pile body of the present invention will be described below with reference to FIG. The pile body 401 of the fifth embodiment is a steel pipe pile, and as shown in FIG. 8, a plate-like lid portion 106 is fitted between the reinforcing portion 4 and the steel pipe portion 3 and fixed by welding at the factory.

[0065] Then, concrete CC is poured into the hollow portion of the steel pipe portion 403b of the second pile main body 401b to form a concrete-filled pile. The other configurations are the same as those of the pile main body 1 in the first embodiment. By using concrete-filled piles, it is possible to obtain piles with high earthquake resistance. In the present embodiment, concrete is filled, but this is not limiting. For example, mortar may be filled.

[0066] (Sixth embodiment) Next, a sixth embodiment of the pile body of the present invention will be described below with reference to FIG. As shown in FIG. 9, the pile body 501 in the sixth embodiment can be connected to the foundation BS of a building.

[0067] This allows the steel pipe pile (pile body 501) and the foundation BS of the building on it to be easily and reliably connected by fixing the flange portion 505 with reinforcing steel bars (for example, long bolts LB). The other configurations are the same as those of the first embodiment, so explanations will be omitted.

[0068] Seventh Embodiment Next, a seventh embodiment of the pile body of the present invention will be described below with reference to FIGS.

[0069] The pile body 601 of the seventh embodiment is a steel pipe pile body 601 comprising a pile body 601 and a blade 2 provided at the tip of the pile body 601, and comprising a steel pipe portion 603, a flange portion 605 arranged at at least one end of the steel pipe portion 603, and a reinforcing portion 604 connecting the flange portion 605 and one end of the steel pipe portion 603, and the reinforcing portion 604 is a rib welded to the flange portion 605 and the peripheral surface of the steel pipe portion 603.

[0070] By forming the reinforcing portion 604 as a rib welded to the flange portion 605 and the circumferential surface of the steel pipe portion 603, the reinforcing portion 604 can be easily formed by welding in a factory.

[0071] Eighth Embodiment Next, an eighth embodiment of the pile body of the present invention will be described below with reference to FIG. As shown in FIG. 12, the pile body 701 of the eighth embodiment includes an attachment 721.

[0072] The attachment 721 comprises a receiving pipe portion 723 which is shorter than the steel pipe portion 3 of the pile main body 701 and has a key 722 attached to its circumferential surface, a receiving flange portion 725 which is positioned at one end of the receiving pipe portion 723, and a receiving reinforcement portion 724 which connects the receiving flange portion 725 to one end of the receiving pipe portion 723.

[0073] The outer diameter d5 of the receiving flange portion 725 exceeds the outer diameter d3 of the receiving pipe portion 723 and is equal to or smaller than the outer diameter D2 of the blade 2. The receiving flange portion 725 of the attachment 721 is joined to the flange portion 705 at the end of the pile body 701 that protrudes from the ground, and the receiving pipe portion 723 is quickly attached to the auger and rotated and pressed into the ground.

[0074] This allows the pile body 701 provided with the flange portion 5 to be attached quickly and reliably using the attachment 721. In addition, the receiving flange portion 725 does not interfere with the excavation by the blades 2.

[0075] The present invention is not limited to the above-described embodiments and shown in the drawings, but can be appropriately modified and implemented within the scope of the invention. [Explanation of symbols]

[0076] 1: pile body, 1a: first pile body, 1b: second pile body, 2: blade, 3: steel pipe section, 4: reinforcing section, 5: flange section, 5a: first flange section, 5b: second flange section, 51: mounting hole (hole), 101: pile body, 106: plate-shaped cover section, 201: pile body, 202: expansion section, 301: pile body, 301a: first pile body, 301b: second pile body, 303a: first steel pipe section, 303b: second steel pipe section, 401: pile body, 501: pile body, 601: pile body, 603: steel pipe section, 604: rib (reinforcing section), 605: flange section, 701: pile body, 721: attachment, 722: key , 723: Receiving pipe part, 724: Receiving reinforcement part, 725: Receiving flange part, 705: Flange part, D2: Outer diameter (blade), D3: Outer diameter (steel pipe part), D4: Outer diameter (reinforcement part), D5: Outer diameter (flange part), D20: Outer diameter (expanded part), D33a: Outer diameter (first steel pipe part), D33b: ​​Outer diameter (second steel pipe part), D35a: Outer diameter (first flange part), D35b: Outer diameter (second flange part), d3: Outer diameter (receiving pipe part), d5: Outer diameter (receiving flange part), h4: Length (reinforcement part), LB: Long bolt (reinforcing steel bar), t3: Thickness (steel pipe part), t4: Thickness (reinforcement part), t5: Thickness (flange part).

Claims

1. A steel pipe pile having a pile body and a blade provided at the tip of the pile body, A steel pipe section, a flange portion disposed on at least one end of the steel pipe portion; a reinforcing portion connecting the flange portion and one end of the steel pipe portion, an outer diameter of the flange portion exceeds an outer diameter of the steel pipe portion and is equal to or smaller than an outer diameter of the blade, The thickness of the reinforcing portion is greater than the thickness of the steel pipe portion and is equal to or less than the thickness of the flange, The length of the reinforcing portion in the direction along which the steel pipe portion extends is 20% or more and 50% or less of the outer diameter of the steel pipe portion. Pile body.

2. A plate-shaped lid portion is interposed between the reinforcing portion and the steel pipe portion. The pile body according to claim 1 .

3. The pile body according to claim 1 , wherein the flange portion is an annular plate member.

4. Axial holes are formed in the flange portion at equal circumferential positions from the central axis of the pile body. The pile body according to claim 3.

5. A connection structure with the second pile body similar to the first pile body according to claim 4, The first and second flange portions are mechanically coupled to each other through a connector inserted into a hole in the first flange portion of the first pile body and a hole in the second flange portion of the second pile body, which are opposed to each other. Connecting structure of the pile body.

6. an expanded diameter portion is interposed between the first flange portion and the second flange portion; an outer diameter of the expanded diameter portion exceeds outer diameters of the first flange portion and the second flange portion and is equal to or smaller than an outer diameter of the blade; The pile body connection structure according to claim 5.

7. A connection structure between the first pile body and the second pile body as described in claim 1, The outer diameter of the steel pipe portion of the second pile body located on the upper side is larger than the outer diameter of the steel pipe portion of the first pile body, Connecting structure of the pile body.

8. A steel pipe pile having the pile body according to claim 2, wherein the steel pipe portion is filled with concrete or mortar.

9. A connection structure between a steel pipe pile having the pile body according to claim 1 and a foundation of a building on the pile, wherein reinforcing steel bars of the building are fixed to the flange portion. A structure that connects to the foundation of a building.

10. A steel pipe pile having a pile body and a blade provided at the tip of the pile body, A steel pipe section, a flange portion disposed on at least one end of the steel pipe portion; a reinforcing portion connecting the flange portion and one end of the steel pipe portion, The reinforcing portion is a rib welded to the flange portion and the circumferential surface of the steel pipe portion.

11. A method for burying a steel pipe pile having the pile body according to claim 1, Prepare the attachment The attachment comprises a receiving pipe portion that is shorter than the steel pipe portion of the pile body and has a key attached to its circumferential surface, a receiving flange portion that is disposed at one end of the receiving pipe portion, and a receiving reinforcement portion that connects the receiving flange portion and one end of the receiving pipe portion, the outer diameter of the receiving flange portion is greater than the outer diameter of the receiving pipe portion and is equal to or smaller than the outer diameter of the blade, The receiving flange portion of the attachment is connected to the flange portion of the end of the pile body that protrudes from the ground, The receiving pipe portion is attached to an auger and rotated and pressed into place. How to bury steel pipe piles.

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