JPH1143937A - Pile coupling part structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pile coupling part structure in which deformation of a pile coupling part is restricted to provide high bending yield strength. SOLUTION: In a pile coupling part structure, a pair of an outer engagement end part 4 and an inner engagement end part 6 to be engaged with each other are respectively formed on a first pile 1 and a second pile 2 adjacent to each other in an axial center direction, and an engagement part 7 and a counter part 8 to be engaged with each other to be removal-proofed from each other by relative rotation operation around an axial center in the condition as the outer engagement end part 4 and the inner engagement end part 6 are engaged with each other are respectively provided on an inner wall part 11 of the outer engagement end part 4 and an outer wall part 12 of the inner engagement end part 6. The engagement part 7 and the counter part 8 are provided with means to prohibit the engagement part 7 and the counter part 8 from getting apart from each other in a diametric direction of the first pile 1 or the second pile 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a pair of outer fitting ends and inner fitting ends which can be freely fitted to each other are formed on a first pile and a second pile adjacent to each other in the axial direction, respectively. In a state where the outer fitting end and the inner fitting end are fitted, the engaging portion and the engaged portion are engaged with each other so as to prevent them from being detached from each other by a relative rotation operation around the axis. The present invention relates to a joint structure of a pile provided separately on an inner wall portion of an outer fitting end portion and an outer wall portion of the inner fitting end portion.

[0002]

2. Description of the Related Art Conventionally, as a joint portion structure of this kind of pile, there has been a screw type as shown in FIG. That is, the male threaded portion 30 is formed at the end of one of the connected piles, and the female threaded portion 31 is formed at the end of the other pile. For example,
Of these, the pile having the female thread 31 formed therein is first buried in the ground, and the pile having the male thread 30 formed therein is screwed and connected to the buried pile. This screwing operation is performed in a state where the axes Z1 and Z2 of both piles are matched. If the joint structure of the pile is a screw type, a large number of threads along the longitudinal direction of the pile are engaged. Therefore, after the connection is completed, the pile has high strength against bending force and the like acting on the pile.

[0003]

However, the conventional joint structure of a pile has the following problems. For example, when a strong bending force is applied to the joint, FIG.
As shown in (a), the proximal end 9 of the first pile 1 and the distal end 10 of the second pile 2 and the distal end 10 of the first pile 1 and the second
The joint may be deformed in a state where the pile 2 is separated from the base end 9. When the deformation occurs, the bending force on the pile is concentrated on the portion still in contact between the outer fitting end 4 of the first pile 1 and the inner fitting end 6 of the second pile 2, The outer fitting end 4
The deformation between the first pile 1 and the second pile 2 may be further increased, and the connection between the first pile 1 and the second pile 2 may be disconnected. FIG.
When a strong tensile force is applied to the joint as shown in (b), or when a strong compressive force is applied to the joint as shown in FIG. The part 10 is separated from the first stake 1 and the second stake 2 so that the first stake 1 and the second stake 2 can easily come off. As a result, as a result of the first pile 1 and the second pile 2 being separated and approaching each other against the engagement between the engaging portion 7 and the engaged portion 8, the outer fitting end portion 4 expands in diameter, and the inner fitting is performed. The end 6 is caused by the diameter reduction. As described above, the joint portion where deformation easily occurs cannot exhibit sufficient joint proof strength, and there is still room for improvement. An object of the present invention is to solve the disadvantages of the prior art and to suppress the deformation of the joint portion of the pile to provide a joint structure of the pile having high bending strength.

[0004]

[Means for Solving the Problems]

(Structure 1) As described in claim 1, the joint structure of the pile according to the present invention is configured such that the engaged engaging portion and the engaged portion are separated from each other in the radial direction of the first pile or the second pile. It is characterized in that separation preventing means for blocking is provided in the engaging portion and the engaged portion. (Operation / Effect) As in this configuration, if the engaged engaging portion and the engaged portion are not separated in the radial direction of the first pile or the second pile, the outer fitting end of the first pile And the abutment state of the second pile and the inner fitting end of the second pile can be favorably maintained. For example, even when a bending force is applied to the joint of the pile, the contact area between the outer fitting end and the inner fitting end does not change. Therefore, since the bending force applied to the joint portion can be shared by the outer fitting end and the inner fitting end as a whole, a change in the cross-sectional shape and the like of the outer fitting end and the inner fitting end is suppressed. be able to. As a result, a joint having high bending strength can be obtained.

(Structure 2) In the joint structure of a pile according to the present invention, as described in claim 2, when the separation preventing means is configured, the joint is configured as viewed in a longitudinal sectional view of the first pile or the second pile. One of the mating portion and the engaged portion may be configured to have an enlarged protruding portion that is wider toward the protruding tip side, and the other may be configured to have a groove shape into which the enlarged protruding portion can be inserted. (Operation / Effect) As in the present configuration, for example, a dovetail groove structure can be considered as a method for engaging the engaging portion having the enlarged projecting portion with the groove-shaped engaged portion. In this case,
Not only when a bending force is applied to the joint, but also when a tensile force or a compressive force is applied, the separation between the outer fitting end and the inner fitting end is effectively prevented, so that any external force is A joint part exhibiting high proof stress can be configured.

(Structure 3) In the joint structure of a pile according to the present invention, the engaging portion and the engaged portion may be in the axial direction of the first pile or the second pile. A plurality can be provided along. (Operation / Effect) With this configuration, the joint length of the pile in the longitudinal direction between the first pile and the second pile can be reliably ensured, so that a joint having higher bending strength can be obtained. it can.

(Structure 4) In the joint structure of a pile according to the present invention, the mutual contact surfaces of the engaging portion and the engaged portion may be the first pile and the second pile. It can be formed so as to be inclined with respect to the circumferential direction of the pile and to constitute a part of the spiral. (Operation / Effect) As in the present configuration, if the contact surface between the engaging portion and the engaged portion is inclined, the contact force between the engaging portion and the engaged portion when rotating the second pile is reduced. And a strong joint can be obtained. Further, even if play is present between the engaging portion and the engaged portion when the second pile is inserted into the first pile, such play is eliminated with the rotation of the second pile. Therefore, the manufacturing accuracy of the engaging portion and the like can be reduced. Furthermore, in the case of this configuration,
A stopper function occurs when rotating the second pile. In other words, it is possible to avoid inconveniences such as the engagement between the engaging portion and the engaged portion being disengaged due to the excessive rotation of the second pile, so that the connection operation of the piles is simplified.

(Structure 5) In the joint structure of a pile according to the present invention, the outer fitting end and the inner fitting end are provided with annular projections at respective distal ends, and the outer fitting is provided. The base portion of each of the end portion and the inner fitting end portion may be provided with a base end groove portion engageable with the annular convex portion from the axial center direction of the first pile or the second pile. . (Operation / Effect) In general, it is the opening end that is most likely to undergo cross-sectional deformation in the cylindrical body. Also in this configuration,
It is considered that the tip of the first pile and the tip of the second pile are most easily deformed. That is, these tip portions are thinner than the main body of the first pile or the main body of the second pile,
This is because the degree of deformation constraint by the pile body is smaller than that at the base end. However, according to this configuration, for example, since the distal end of the inner fitting end is prevented from separating from the base end of the outer fitting end, deformation of the distal end can be effectively prevented, and bending can be prevented. It is possible to obtain a joint part exhibiting high strength against force and the like.

(Structure 6) As described in claim 6, in the joint structure of the pile according to the present invention, an outer peripheral portion of a tip portion related to the inner fitting end portion and a tip portion related to the outer fitting end portion are included. A chamfered portion may be provided on the peripheral portion. (Function / Effect) With this configuration, when inserting the inner fitting end into the outer fitting end, it is possible to avoid a situation in which the two abut against each other and hinder the insertion of the inner fitting end, and Can be smoothly performed.

[0010]

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

(Overview) The joint structure of the pile according to the present invention is shown in FIG.
As shown in, for example, the first buried first in the burial hole
It is provided between the pile 1 and the second pile 2 connected to the first pile 1. Specifically, the first pile 1 is a first pile main body 3
And the outer fitting end 4, and the second pile 2 comprises a second pile main body 5 and an inner fitting end 6. In a normal case, the inner fitting end 6 is inserted into the outer fitting end 4 to connect the first stake 1 and the second stake 2 for the reason that the progress of the work is easily visually recognized. The joint structure of the pile according to the present invention is such that the inner fitting end 6 having the engaged portion 8 formed therein is inserted into the outer fitting end 4 having the engaging portion 7 formed therein. Is the axis Z2 of the second pile 2
The engaging portion 7 and the engaged portion 8
Are fixed to each other in a state where the inner fitting end 6 is prevented from falling out of the outer fitting end 4.

(Engagement Part and Engagement Part) The first pile 1 and the second pile 2 have, for example, the appearance shown in FIG. The outer fitting end 4 includes a base end 9 and a distal end 10. Base end 9
Means a portion of the outer fitting end 4 on the first pile main body 3 side,
The tip portion 10 literally means a portion near the tip portion 10 of the first pile 1. The inner wall portion 11 of the outer fitting end portion 4 extending from the distal end portion 10 to the base end portion 9 has a substantially cylindrical shape. The inner wall portion 11 is provided with an engaging portion 7 protruding in the radial direction X of the axis Z1 of the first pile 1. The engaging portion 7 is a portion that engages with the engaged portion 8 of the second pile 2 as described later. The plurality of engaging portions 7 are provided on the inner wall portion 11 at intervals along the circumferential direction Y thereof. In the present embodiment, four points are provided along the circumferential direction Y. The individual engaging portions 7 are dispersedly arranged in a direction of approximately 90 degrees around the axis Z1, and the individual engaging portions 7 extend over a range of approximately 45 degrees. In the present embodiment, the engaging portions 7 are provided at a plurality of positions in the direction along the axis Z1. Of course, only one engaging portion 7 may be provided along the axis Z1 direction. However, when provided at a plurality of locations, the joint portion length of the pile in the longitudinal direction of the pile can be reliably ensured, so that a joint portion having higher bending strength can be obtained. It is assumed that the positional relationship between the engaging portions 7 adjacent in the direction of the axis Z1 substantially coincides with the direction of the axis Z1 as shown in FIG. In this way, the engaging portions 7 are formed at a total of 16 locations.

On the other hand, the inner fitting end 6 of the second pile 2 also has a base end 9.
And the tip 10. The outer wall 12 of the inner fitting end 6 is also formed in a substantially cylindrical shape. On the outer wall 12 of the inner fitting end 6,
An engaged portion 8 is provided. The engaged portions 8 are dispersed and arranged in a direction of approximately 90 degrees around the axis Z2 of the second pile 2 as in the first pile 1 and extend over a range of approximately 45 degrees along the circumferential direction Y. It has been extended. A plurality of the engaged parts 8 are provided along the direction of the axis Z2, and the engaged parts 8 adjacent to each other in the direction of the axis Z2 are made substantially coincident with each other in the direction of the axis Z2. In this way, the engaged portions 8 are also formed at a total of 16 locations.

In this embodiment, the engaging portion 7 and the engaged portion 8 are formed in a dovetail shape. That is, as shown in FIG. 1, for example, the engaging portion 7 formed on the outer fitting end 4 is
In the vertical cross-sectional view of the above, a configuration is adopted in which an enlarged protruding portion 7a is wider toward the protruding tip side. One engaged portion 8 is formed in a groove shape so that the enlarged protruding portion 7a can be inserted from the circumferential direction Y. However, the difference in the shape such as the enlarged protruding portion 7a or the groove portion 8b occurs because the engaging portion 7 and the engaged portion 8 are formed only at one position in the direction of the axis Z1, Z2. This is the case. In the case of the present embodiment shown in FIG. 1, the enlarged protruding portion 7a and the groove 8b are formed at four places along the axis Z1 and Z2 directions. A groove is inevitably formed between the two, and there is no difference between which is the enlarged protrusion 7a and which is the groove 8b.

The connection of the second pile 2 to the first pile 1 is performed in the following manner. As shown in FIG. 1 and FIG.
The pile 2 is inserted in a state where the arrangement of the engagement portions 7 in the axis Z1 direction and the arrangement of the engaged portions 8 in the axis Z2 direction are different positions in the circumferential direction Y. For example, when inserting the second pile 2, the distal end 10 of the inner fitting end 6 abuts on the base end 9 of the outer fitting end 4, and the base end 9 of the inner fitting end 6 fits the outer fitting end 4. Tip 1 of
Repeat until it touches 0. When the second pile 2 is inserted to a predetermined depth, the engaging portion 7 and the engaged portion 8 to be engaged with each other
Are located at different portions in the directions of the axes Z1 and Z2. This state is shown in FIG. In this state, the second pile 2
Is rotated about the axis Z2, the engaging portion 7 and the engaged portion 8 are engaged as shown in FIG. 2C, and the second pile 2 is connected to the first pile 1. be able to. In addition, in order to facilitate the insertion of the second pile 2, as shown in FIG. 1, the outer peripheral portion of the distal end portion 10 related to the inner fitting end portion 6 and the distal end portion 10 related to the outer fitting end portion 4. It is preferable to provide a chamfered portion 13 on the inner peripheral portion.

In order to smoothly rotate the second pile 2, for example, as shown in FIGS. 3 (a) and (b), the outer periphery of the second pile main body 5 and the vicinity of the base end 9 are disposed. It is convenient to attach a handle 14 for rotating work. The handle 14 is configured to be detachable. For this purpose, a bolt hole 15 is provided in the outer peripheral portion, and a handle 14 having a male screw portion at an end portion is provided.
May be screwed. In addition, in order to reliably perform the rotation operation of the second pile 2, for example, as shown in FIGS. 3A and 3B, the outer peripheral surface 10a of the distal end portion 10 of the outer fitting end 4 of the first pile 1 It is preferable to provide alignment marks 16 on the outer peripheral surface 5a of the second pile main body 5 of the second pile 2 near the base end 9 respectively. That is, if the second pile 2 is rotated until the alignment marks 16 match, the engaging portion 7 and the engaged portion 8 are securely engaged.

The engaging portion 7 and the engaged portion 8 configured as described above simply displace the first stake 1 and the second stake 2 along both axes Z1 and Z2. The outer fitting end 4 and the inner fitting end 6 are coaxially fitted to each other, and the engaged portion 7 and the engaged portion 8 are engaged.
Constitute a separation preventing means for preventing the shaft cores Z1, Z2 from separating in the radial direction X. As a result, even when a bending force is applied to the joint between the first pile 1 and the second pile 2 or when a tensile / compression force is applied, the outer fitting end 4 as shown in FIG. No separation from the inner fitting end 6 occurs, and cross-sectional deformation of the outer fitting end 4 and the inner fitting end 6 is suppressed, so that a strong joint can be obtained.

When the second pile 2 is rotated by a predetermined angle around the axis Z2 as in the present invention, the engaging portion 7 and the engaged portion 8 are connected so that the rotating operation can be performed. As a result, there is a case where there is play in the joint portion in a state where the connection of the piles is completed. The presence of such play reduces the strength of the joint. In order to prevent this, in the joint structure of the pile according to the present invention, as shown in FIG. 4, the contact surface 17 between the engaging portion 7 and the engaged portion 8 is formed so as to form a part of a spiral. It is formed obliquely to the circumferential direction Y of Z1 and Z2. In the case of FIG. 4, the upper and lower surfaces of the individual engaging portions 7 or the individual engaged portions 8 are provided with opposite inclinations. With this configuration, when the second pile 2 is rotated, the engaging portion 7 and the engaged portion 8 are rotated.
And the contact force between the engaging portion 7 and the engaged portion 8 can be increased to obtain a strong joint portion. Further, in this case, a stopper function when rotating the second stake 2 is generated, so that the second stake 2 is not rotated too much, and the connection work of the stakes can be simplified.

(Others) The first pile body 3 and the second pile body
The pile main body 5 can be usually formed of a steel pipe such as a rolled steel pipe or a cast pipe because of its high strength and excellent workability. However, it is not limited to this.
It may be a concrete pile. In the case of a concrete pile, the outer fitting end 4 or the inner fitting end 6 formed in advance is used by being embedded in the end of the pile.

(Effect) In the joint structure of the pile according to the present invention, the engaging portion 7 and the engaged portion 8 are engaged with each other so as not to separate in the radial direction X of the first pile 1. Separation preventing means is provided between the portion 7 and the engaged portion 8. As a result, when a bending force is applied to the joint between the first pile 1 and the second pile 2, or
Even when a tensile or compressive force is applied, the outer fitting end 4
And the cross-sectional deformation with the said inner fitting end part 6 is suppressed, the outer fitting end part 4 etc. exhibit high bending strength, and a strong joint part can be comprised. In connecting the second pile 2, it is only necessary to rotate the second pile 2 by a predetermined angle around the axis Z2 of the second pile 2, so that the operation of coupling the piles is very simple. Further, the end of the connection work can be determined based on, for example, the rotation angle of the second stake 2, so that the quality control of the joint portion becomes easy. In addition, if the joint structure of the pile of the present invention,
Since the progress of the work is hardly hindered by the weather, advantages such as shortening of the construction period and cost reduction are obtained.

Alternative Embodiment <1> In the above embodiment, the engaging portion 7 and the engaged portion 8 are formed in a dovetail shape, but the present invention is not limited to this configuration. For example, as shown in FIG. 5, the cross-sectional shape of the engaging portion 7 and the engaged portion 8 in a vertical cross-sectional view of the pile is formed in a substantially T-shape to constitute separation preventing means. Is also good. Also in the case of this configuration, deformation of the cross-sectional shape of the outer fitting end 4 and the inner fitting end 6 can be prevented, and a joint portion of a pile having excellent bending strength and the like can be obtained.

<2> In the above embodiment, the separation preventing means is formed on the engaging portion 7 and the engaged portion 8 themselves so that the engaging portion 7 and the engaged portion 8 do not separate in the radial direction X. But,
The separation preventing means may be configured as follows.
That is, as shown in FIGS. 6A and 6B, an annular convex portion 18 is provided at each of the distal ends 10 of the outer fitting end 4 and the inner fitting end 6, and the outer fitting end 4 and the inner fitting end 6 are provided. A base groove 19 is provided in each base 9. The annular convex portion 18 of the outer fitting end portion 4 is provided on the inner peripheral side of the distal end portion 10, and the annular convex portion 18 of the inner fitting end portion 66 is provided on the outer peripheral side of the distal end portion 10. On the other hand, the base end 9 of the inner fitting end 6 and the base end 9 of the outer fitting end 4 are formed with a base groove 19 along the entire circumference. Both base end grooves 19 protrude in the directions of the axes Z1 and Z2. With this configuration, when the second pile 2 is inserted into the first pile 1, or when the connection between the second pile 2 and the first pile 1 is completed,
As shown in FIG. 6B, the annular projection 18 and the base groove 19 are formed.
Are coaxially engaged. In particular, the annular convex portion 18 and the proximal groove portion 19 come into contact with each other in the radial direction X of the shaft cores Z1 and Z2. In other words, according to the present configuration, when a bending force is applied to the joint, or when an excessive compressive or tensile force is applied along the axial direction, the distal end portion 10 and the proximal end portion 9 are separated from each other. To prevent For example, when a bending force is applied to the joint, the outer fitting end 4 and the inner fitting end 6 are deformed as shown in FIG. 7A, and the degree of engagement between the engaging portion 7 and the engaged portion 8 is reduced. The second pile 2 may be weakened, and the second pile 2 may come off. Even if the second pile 2 can be prevented from coming off, the outer fitting end 4 or the inner fitting end 6 may be deformed. Proof stress decreases. However, if the annular convex portion 18 and the proximal groove portion 19 are provided as in the present configuration, the separation between the distal end portion 10 and the proximal end portion 9 when a bending force is applied to the joint portion can be suppressed. In particular, the cross-sectional shape of the distal end portion 10 of the inner fitting end portion 6 and the outer fitting end portion 4, which tends to be thin, is maintained in a circular cross section, so that a joint portion having high strength can be obtained. 6 (a) and 6 (b), the cross-sectional shapes of the annular convex portion 18 and the base groove portion 19 in the vertical cross-sectional view of the pile are substantially rectangular. It may be configured in a shape or the like. In short, the annular protrusion 18 and the base groove 1
Any configuration may be employed as long as the deformation of the cross-sectional shapes of the distal end portion 10 and the base end portion 9 can be suppressed by engagement with the distal end portion 10 and the proximal end portion 9. Further, in this alternative embodiment, the engaging portion 7 and the engaged portion 8 are formed in a substantially rectangular cross section, but the present invention is not limited to this configuration. That is, although not shown, the annular projecting portion 18 and the base groove 19 are provided, and the engaging portion 7 and the engaged portion 8 are connected to an enlarged projecting portion as shown in FIGS. May be configured.
In this case, the degree of engagement between the outer fitting end 4 and the inner fitting end 6 can be further increased.

<3> In the above embodiment, the example in which the engaging portion 7 and the engaged portion 8 are intermittently arranged in the circumferential direction Y of the shaft centers Z1 and Z2 has been described. However, the engaging portion 7 and the engaged portion 8 may be simply formed in a screw shape. However, even in that case, the cross-sectional shape of the engaging portion 7 and the like is, for example, a dovetail shape, and the engaging portion 7 and the engaged portion 8 are not separated from each other in the radial direction X of the axis. I do. In the case of this configuration, as compared with the above embodiment, the labor for manufacturing the engaging portion 7 and the like and the labor for screwing the second pile 2 are increased, but the engaging portion 7 is provided over the entire circumference of the joint portion. And the engaged portion 8 can be engaged with each other, so that a stronger joint portion of the pile can be obtained.

In the description of the appended claims, reference is made to the drawings and, in order to facilitate comparison with the drawings, reference numerals are used. However, the description is not intended to limit the present invention to the configuration of the accompanying drawings. Absent.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a joint structure of a pile according to the present invention.

FIG. 2 is a longitudinal sectional view showing a connecting process of piles.

FIG. 3 is a cross-sectional view showing a connecting process of the piles.

FIG. 4 is an explanatory view showing an inclined state of an engaging portion and an engaged portion.

FIG. 5 is an explanatory view showing a joint structure of a pile according to another embodiment.

FIG. 6 is a longitudinal sectional view showing a connecting process of a pile according to another embodiment.

FIG. 7 is a longitudinal sectional view showing a joint structure of a pile according to a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st pile 2 2nd pile 4 Outer fitting end 6 Inner fitting end 7 Engaging part 7a Enlarged protruding part 8 Engaged part 9 Base end of outer fitting end / inner fitting end 10 Outer fitting end・ Front end of inner fitting end 11 Inner wall of outer fitting end 12 Outer wall of inner fitting end 13 Chamfered part of distal end 18 Ring-shaped convex part 19 Base groove Y Y Circumferential direction of first pile and second pile

Claims (6)

[Claims] A pair of outer fitting ends (4) that can be fitted to each other.
And an inner fitting end (6) are formed separately on a first pile (1) and a second pile (2) adjacent in the axial direction, and the outer fitting end (4) and the inner fitting end are formed. With the part (6) fitted, the engaging part (7) and the engaged part (8), which engage with each other so as to prevent them from being detached from each other by a relative rotation operation around the axis, are separated from the outer part. The joint structure of a pile provided separately on an inner wall portion (11) of a fitting end portion (4) and an outer wall portion (12) of the inner fitting end portion (6), wherein the engaged engagement is provided. Means for preventing the part (7) and the engaged part (8) from being separated from each other in the radial direction of the first pile or the second pile; Joint structure of a pile provided on the engaged portion (8). 2. A method according to claim 1, wherein said separation preventing means comprises:
In the vertical section view of the pile or the second pile, one of the engaging portion (7) and the engaged portion (8) has a shape having an enlarged protruding portion (7a) that is wider toward the protruding tip side,
The joint structure of a pile according to claim 1, wherein the other has a groove shape into which the enlarged protrusion (7a) can be inserted. 3. The engaging portion (7) and the engaged portion (8).
3. The joint structure of a pile according to claim 1, wherein a plurality of the piles are provided along an axial direction of the first pile (1) or the second pile (2). 4. 4. The engaging part (7) and the engaged part (8).
Contact surfaces (17) with each other are formed obliquely with respect to the circumferential direction (Y) of the first pile (1) and the second pile (2) so as to form a part of a spiral. The joint structure of a pile according to any one of 1 to 3. 5. A pair of outer fitting ends (4) which can be fitted to each other.
And an inner fitting end (6) are formed separately on a first pile (1) and a second pile (2) adjacent in the axial direction, and the outer fitting end (4) and the inner fitting end are formed. With the part (6) fitted, the engaging part (7) and the engaged part (8), which engage with each other so as to prevent them from being detached from each other by a relative rotation operation around the axis, are separated from the outer part. A pile joint structure separately provided on an inner wall portion (11) of a fitting end portion (4) and an outer wall portion (12) of the inner fitting end portion (6), wherein the outer fitting end portion ( An annular projection (18) is provided at the tip (10) of each of the inner fitting end (4) and the inner fitting end (6), and each of the outer fitting end (4) and the inner fitting end (6) is provided. The base end (9) is provided with a base groove (19) which can be engaged with the annular projection (18) from the axial direction of the first pile (1) or the second pile (2). Pile joint structure. 6. A tip (10) relating to said inner fitting end (6).
And a tip (10) according to the outer fitting end (4).
The joint structure of a pile according to any one of claims 1 to 5, wherein a chamfered portion (13) is provided on an inner peripheral portion of the pile.