JP2011032783A - Pile joint structure and connection member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pile joint structure and a connection member capable of transmitting rotational torque generated while driving a pile simply and securely and ensuring satisfactory rigidity of a connection part of piles. <P>SOLUTION: This pile joint structure is constituted by forming a receiving part 2 having a circular cross section in the direction of shaft axis on an inside diameter face on a tip side of a socket of the lower pile 1a and forming a female type transmission part 3 having a hexagonal cross section in the direction of shaft axis continuously with the receiving part 2 in the direction of shaft axis on an inside diameter face on an innermost side of the socket. On the other hand, a male type transmission part 5 being engaged with the female type transmission part 3 and having a hexagonal cross section in the direction of shaft axis is formed at a tip of an insertion port of the upper pile 1b, and an insertion part 6 being engaged with the receiving part 2 and being circular in the direction of shaft axis is formed continuously with the male type transmission part 5 in the direction of shaft axis on an outside diameter face on a root side of the insertion port. When the insertion port of the upper pile 1b is inserted into the socket of the lower pile 1a, both of the transmission parts 3, 5 are mutually engaged to transmit rotational torque simply and securely. Since both of the receiving part 2 and the insertion part 6 have circular cross sections, this structure can prevent the occurrence of deflection without depending on the direction of bending moment. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a pile joint structure of a foundation pile made of a tubular body, which is used for construction of a building, and a connecting member for a pile driving machine adopting this pile joint structure.

  As shown in FIG. 8, the foundation pile used for the construction of the building is provided with an excavation part 18 at the tip (lower end) of the pile 1, and the excavation part 18 is moved by rotating the rotary shaft 13 of the pile driver 19. Rotate around the axis to perform the placement work. And corresponding to the placement depth, the placement work is advanced while sequentially connecting the plurality of piles 1. The piles 1 are connected to each other by inserting the insertion port of the other pile (upper pile 1b) into the receiving port of one pile (lower pile 1a) and engaging it with the pile driving machine 19 by this engagement. The rotational torque given to the pile 1b is transmitted to the lower pile 1a, so that excavation by the excavation part 18 can be performed smoothly.

  In transmitting this rotational torque, if relative rotation (slip) around the shaft center occurs between the piles 1a and 1b, the transmission is not ensured, and the working efficiency is significantly reduced. For this reason, for example, as shown in FIG. 9, the upper pile 1b has a hexagonal male transmission section 5 having a hexagonal cross section on the outer peripheral surface, and the lower pile 1a has a female section having a hexagonal cross section on the inner peripheral surface. By forming each of the shape transmitting portions 3 and inserting them into each other to engage the both transmitting portions 3 and 5, relative rotation of both piles 1a and 1b is prevented (see Patent Document 1 below).

Japanese Patent No. 4137683

  Further, this pile is driven by a pile driving machine 19 shown in FIG. 8. The rotary shaft 13 (hydraulic motor) and the pile 1 of the pile driving machine 19 used for this driving are connected via a connecting member 12. Connected. The configuration of the connecting portion will be described with reference to FIG. In this connection structure, the rotation shaft 13 of the pile driving machine 19 is inserted into the connection member 12, and the fixing pin 17 is provided in the fixing groove 15 and the fixing hole 16 formed in the rotation shaft 13 and the connection member 12. 13 and the connecting member 12 are fixed, and a protrusion 22 formed at the tip (upper end) of the pile 1 is brought into contact with a locking piece 21 formed at the pile receiving portion 20 of the connecting member 12. Then, the rotational torque from the rotary shaft 13 is transmitted to the pile 1 through the locking pieces 21 and the protrusions 22 to perform the placing work.

The connection structure according to Patent Document 1 has several problems.
First, if the whole connecting part of both piles 1a and 1b is processed into a non-circular shape such as a hexagon, a thin part is generated by the processing. When this thin portion is generated, the section modulus that affects the strength of the structure is reduced, and there is a problem that the connecting portion is likely to be damaged during the placing operation.

  Second, in particular, when the inner peripheral surface on the front end side of the receiving port is hexagonal, stress concentration tends to occur at each front end portion (each vertex of the hexagon). For this reason, there is a problem that defects such as cracks are likely to occur due to this stress concentration.

  Third, when the receiving port is a polygonal shape such as a hexagon, directionality occurs with respect to rigidity when a bending moment acts on the connecting portion. That is, the bending amount of the pile 1 when the bending moment acts on each side of the polygon in the vertical direction and when the bending moment acts on each vertex direction from the center of the polygon is different. There is a problem as a characteristic of the pile 1 in which the directionality is required.

  Moreover, in the connection of the pile driving machine 19 and the pile 1 using the connection member 12 described above, it is necessary to form a protrusion 22 in advance at the tip of the pile 1 that is directly connected to the connection member 12. Moreover, since a large rotational torque is applied to the projection 22 from the rotary shaft 13, it is necessary to employ a reliable and strong fixing means such as welding so as not to be damaged during the placing operation. For this reason, the work cost may be high due to the fixing work of the protrusions 22.

  Then, this invention makes it a subject to ensure the intensity | strength and rigidity of the connection part between piles and a pile driving machine, and a pile while performing transmission of the rotational torque in the driving | operation of a pile easily and reliably.

  In order to solve the above problems, the present invention forms a receiving portion having a circular cross section in the axial direction on the inner diameter surface of the receiving end of one pile made of a tubular body, and on the inner diameter surface on the inner side of the receiving port. In the axial direction, continuous with the receiving portion, the axial cross section forms a non-circular female transmission portion, on the outer diameter surface on the distal end side of the insertion port of the other pile made of a tubular body, A male transmission portion that engages with the female transmission portion is formed, and an insertion that engages with the receiving portion is formed on the outer diameter surface of the insertion mouth root, continuously in the axial direction of the male transmission portion. One is formed so that a rotation torque is transmitted by engagement of the female transmission part and the male transmission part when the pile is embedded by forming the insertion part and inserting the other pile into the one pile. Thus, the pile joint is connected to prevent the two piles from being bent relative to each other by the engagement between the receiving portion and the insertion portion. You configure the structure.

  When the cross sections in the axial direction of the female transmission part and the male transmission part are made non-circular and the transmission parts are engaged with each other, they are engaged with each other, and one of the piles is rotated around the axis. When rotating, the rotational torque is reliably transmitted to the other pile. For this reason, it is hard to produce slip between both piles, and the driving | operation operation | work of a pile can be performed reliably.

  Furthermore, the axial cross section of the receiving part and the insertion part is made circular and isotropic, so that the bending caused by any bending moment is effectively applied to the pile from any direction. Can be suppressed. Further, since stress concentration is unlikely to occur at the tip of the receptacle, it is possible to prevent damage at the receptacle.

  Moreover, in this structure, it is preferable that the shape of the cross section of the female transmission part and the male transmission part in the axial direction is a polygon.

  By engaging the two transmission parts processed into a polygonal shape in this way, the polygonal corners of the two transmission parts mesh with each other, so that slippage hardly occurs between the two transmission parts. For this reason, the transmission loss of rotational torque can be suppressed as much as possible, and the pile driving operation can be more reliably performed.

  The two transmission parts may be configured such that the male transmission part fits into the female transmission part, but the maximum outer dimension in the axial center radial direction of the male transmission part is the axial center radial direction of the female transmission part. The outer diameter of the male transmission portion is smaller than the maximum outer dimension of the male transmission portion, and in the connected state of both piles, one pile can rotate relative to the other pile around the axis by a predetermined angle. It is preferable that the maximum outer dimension in the direction is designed to be larger than the minimum inner dimension in the axial direction of the female transmission portion.

  In order to engage (insert) the male transmission part with the female transmission part, it is necessary to make the maximum outer dimension of the male transmission part slightly smaller than the maximum outer dimension of the female transmission part. Naturally, “to allow relative rotation by a predetermined angle” as used herein means that “play” is a slight slack when both piles are relatively rotated around the axis while engaged. It means to have it.

  By providing play in this way, even if the piles are relatively bent in the placing operation of the pile, a part of the polygonal corner of the male transmission part (the end of the ridgeline of the corner) It becomes difficult to make point contact with the inner surface of the female transmission portion. For this reason, it can prevent as much as possible that the said inner surface is damaged by this point contact. Even when this play is provided, when the upper pile is rotated, the polygonal corner (ridge line portion) of the male transmission portion comes into line contact with the inner surface of the female transmission portion, and rotation torque is reliably transmitted. . For this reason, the malfunction resulting from play does not occur.

  However, if the maximum outer dimension in the axial direction of the male transmission portion is too small, the inner diameter of the female transmission portion does not come into contact with each other and rotation torque cannot be transmitted. It is necessary to make it larger than the minimum inner dimension in the axial direction of the transmission portion.

  The polygons of the female transmission part and the male transmission part are more preferably hexagonal.

  When a large rotational torque is applied to the polygonal corners (ridge lines) of both transmission parts, for example, if the number of angles is small, such as a triangle to a pentagon, the rotational torque applied to each corner is reduced. The size tends to increase. As a result, problems such as missing corners may occur, and rotational torque may not be transmitted reliably.

  On the other hand, if the number of corners is too large, such as a heptagon, the inner angle of each corner gradually approaches 180 degrees, and the degree of biting of this corner (ridgeline portion) into the inner diameter surface of the female transmission portion Tends to be small. As a result, idling occurs between the two transmission parts, and the rotational torque may not be transmitted as described above. Considering these, it is most appropriate that the cross-sectional shape in the axial direction of both transmission parts is a hexagon.

  Further, instead of making the cross section in the axial direction of both the transmission parts into a polygonal shape such as a hexagon, a part of the circumference may be cut off by at least one plane.

  In this case, both transmission parts engage via the plane, and rotational torque is transmitted. The number and arrangement of the planes can be determined as appropriate in consideration of the magnitude of the applied rotational torque. By adopting this shape, the amount of processing in grinding can be reduced and the processing cost can be reduced as compared with the case where the cross section in the axial center direction of both transmission parts is a hexagonal shape or the like. .

  Moreover, in said each structure, in the state which inserted the other pile in said one pile, it is preferable to provide the latching member interposed in both piles, and to make it prevent retaining of piles.

  Since the female transmission part and the male transmission part are connected simply by being inserted, the connecting operation itself is very simple, but when the pulling force is applied to the pile, it is easily removed. Therefore, by providing the locking member, it is possible to reliably prevent the piles from coming out even when the piles are reversely rotated and retracted in the ground direction.

  Further, on the tip end side of the rotary shaft of the pile driving machine, a male transmission portion that engages with a non-circular female transmission portion formed in the inner diameter surface on the inner side of the pile receiving port is formed, Inserted on the base side of the male transmission section, which is continuous with the male transmission section in the axial direction, and is formed on the inner diameter surface of the pile's receiving end and engages with the circular receiving section having an axial cross section. While forming a recess, and inserting the tip side into the receiving port of the pile to embed the pile, while transmitting the rotational torque by engagement of the female transmission portion and the male transmission portion, The engagement between the receiving portion and the insertion portion can prevent the rotating shaft and the pile from being bent relatively at that portion.

  By making the tip shape of the rotating shaft as described above, the pile driving machine and the pile can be easily connected, and the rotational torque from the rotating shaft is transmitted to the pile without loss as in the case of connecting the piles. can do.

  Moreover, in the connection structure of the rotating shaft and pile of this pile driving machine, both the said female transmission part and the male transmission part can be made into a hexagon in an axial direction cross section. If it does in this way, as above-mentioned, transmission of rotational torque can be performed more reliably.

  In addition, a male transmission portion is formed on one end side of the rod-shaped connecting member and engages with a female transmission portion whose axial center cross section formed on the inner diameter surface on the back side of the pile is noncircular, An insertion portion that is formed on the inner diameter surface of the pile receiving end at the base end side of the transmission portion and that is continuous with the male transmission portion in the axial direction and engages with the circular receiving portion in the axial direction. And forming the connecting portion connected to the rotary shaft of the pile driving machine on the other end side of the connecting member, and inserting the one end side into the receiving port of the pile to bury the pile, the female transmission Rotation torque is transmitted by the engagement of the male part and the male transmission part of the pile, while the two piles are relatively bent at the insertion part by the engagement of the receiving part and the insertion part. It is possible to configure a connecting member that connects the pile driving machine and the pile, which are prevented from doing so.

  When this connecting member is used, the pile driving machine and the pile can be easily and reliably connected, so that the workability of the placing work is further improved.

  Moreover, in the connection structure of this connection member, the male transmission part of a connection member can be made into a hexagon in the cross section in an axial direction similarly to the joint structure of piles. If it does in this way, as above-mentioned, transmission of rotational torque can be performed more reliably.

  In this invention, on the inner diameter surface and the outer diameter surface of the pile to be connected, a female transmission portion or a male transmission portion having a non-circular cross section in the axial direction is formed, and both transmission portions are engaged, and the axial direction The receiving portion and the insertion portion having a circular cross section are engaged with each other. For this reason, the engagement of the female transmission part and the male transmission part can reliably transmit the rotational torque in the driving operation of the pile, and the engagement of the receiving part and the insertion part allows the The strength and rigidity of the connecting portion can be ensured.

The disassembled perspective view which shows 1st embodiment of the pile joint structure which concerns on this invention In 1st embodiment, it is a figure which shows the state which connected both the piles, Comprising: (a) is side surface sectional drawing, (b) is AA sectional drawing of (a). The perspective view which shows the whole pile according to the first embodiment Exploded perspective view showing a second embodiment of a pile joint structure according to the present invention In 2nd embodiment, it is a figure which shows the state which connected both piles, Comprising: (a) is side sectional drawing, (b) is BB sectional drawing of (a), (c) is front sectional drawing, (D) is CC sectional drawing of (c). It is a figure which shows one Embodiment of the connection member of the pile driving machine which concerns on this invention, Comprising: (a) is a decomposition | disassembly side view, (b) is side sectional drawing. The side view which shows one Embodiment of the connection structure of the rotating shaft and pile of the pile driving machine which concerns on this invention Side view showing pile driving work with pile driver Exploded perspective view showing an embodiment of a pile joint structure according to the prior art It is a figure which shows one Embodiment of the connection member of the pile driving machine which concerns on a prior art, Comprising: (a) is a decomposition | disassembly side view, (b) is side surface sectional drawing of the principal part, (c) is D- of (b). D cross section

  1 to 3 show a first embodiment of a pile joint structure according to the present invention.

  In this configuration, a receiving portion 2 having a circular cross section in the axial direction is formed on the inner diameter surface of the receiving end of the one pile 1 (hereinafter referred to as “lower pile 1a”) made of a tubular body, A female transmission portion 3 having a hexagonal cross section in the axial direction is formed on the inner diameter surface on the back side of the receiving port, continuously in the axial direction with the receiving portion 2. A step surface 4 is formed between the receiving portion 2 and the female transmission portion 3. The receiving part 2, the female transmission part 3 and the step surface 4 are integrally formed by a casting method, but can also be processed by external grinding.

  On the other hand, on the outer diameter surface on the distal end side of the insertion port of the other pile 1 (hereinafter referred to as “upper pile 1b”), which is also a tubular body, there are six axial cross sections that engage with the female transmission portion 3. A rectangular male transmission portion 5 is formed, and an axial cross section that engages with the receiving portion 2 continuously with the male transmission portion 5 in the axial direction on the outer diameter surface on the base side of the insertion opening. A circular insertion portion 6 is formed. A step surface 4 is formed between the male transmission portion 5 and the insertion portion 6. The male transmission portion 5, the insertion portion 6 and the stepped surface 4 are also integrally formed by casting as in the case of the receiving port, but can also be processed by external grinding.

  Further, both the lower pile 1a and the upper pile 1b are respectively formed with bolt holes 8 through which bolts 7 for preventing the piles 1a and 1b from coming off are connected.

  The maximum outer dimension in the axial direction of the male transmission portion 5 is slightly smaller than the maximum outer dimension in the axial direction of the female transmission portion 3. A slight gap (play) is provided. On the other hand, the inner diameter of the receiving part 2 is formed slightly larger than the outer diameter of the insertion part 6, and a gap is provided between both parts 2 and 6, but the size of the gap is The size of the gap between the transmission parts 3 and 5 is smaller.

  When the insertion port of the upper pile 1b is inserted into the receiving port of the lower pile 1a, the female transmission unit 3 and the male transmission unit 5 are engaged, and the receiving unit 2 and the insertion unit 6 are engaged. Further, in this inserted state, the bolt 7 is provided with the bolt 7 and fixed with the washer 9 and the nut 10. Thereby, both piles 1a and 1b are prevented from coming off. In order to prevent the play between the two piles 1a and 1b, which will be described later, from being hindered by this bolt 7, the inner diameter of the bolt hole 8 is made larger than the thickness of the bolt 7 so that both the piles 1a and 1b are pivoted. It is designed to allow relative rotation around the heart.

  In the inserted state of both the piles 1a and 1b, even if a bending moment acts on both the piles 1a and 1b and bending occurs, the play provided between the transmission parts 3 and 5 causes the male transmission part 5 to Part of the hexagonal corner 5a (the end of the ridge line of the corner) is difficult to make point contact with the inner surface of the female transmission portion 3. For this reason, it can prevent as much as possible that the said inner surface is damaged by this point contact.

  When a larger bending moment is applied, the receiving portion 2 and the insertion portion 6 come into contact with each other while maintaining a play between the transmission portions 3 and 5. Then, this contact prevents the piles 1a and 1b from further bending. As a result, in the same manner as described above, a part of the corner 5a of the male transmission part 5 is less likely to make point contact with the inner surface of the female transmission part 3, and damage to the inner surface can be prevented as much as possible. In addition, since the cross section in the axial center direction of the receiving portion 2 and the like is circular, the deflection suppressing effect is exhibited without depending on the direction in which the bending moment acts.

  Even when the play is given in this way, as shown in FIG. 2 (b), when the upper pile 1 b rotates, the hexagonal ridge line portion 5 b of the male transmission portion 5 is lined with the inner surface of the female transmission portion 3. Contact is made and rotation torque is reliably transmitted. For this reason, there is no loss of rotational torque such as slippage due to play. Further, the upper pile 1b is loaded with a downward pushing force together with the rotational torque by the pile driving machine 19, and this pushing force acts on the lower pile 1a via the step surfaces 4 and 4 of both transmission portions 3 and 5. Then, the pile 1 is placed.

  4 and 5 show a second embodiment of the pile joint structure according to the present invention.

  In this configuration, a receiving portion 2 having a circular cross section in the axial direction is formed on the inner diameter surface of the lower pile 1a on the receiving end, and the receiving portion 2 and the inner diameter surface on the inner side of the receiving port are Continuing in the axial direction, a female transmission section 3 is formed in which the shape of the cross section in the axial direction is cut off by two planes facing part of the circumference to form a flat portion 11. A step surface 4 is formed at a part between the receiving portion 2 and the female transmission portion 3. The receiving portion 2, the female transmission portion 3, and the step surface 4 are integrally formed by a casting method.

  On the other hand, the shape of the cross section in the axial direction that engages with the female transmission part 3 is cut off by the two planes facing each other on the outer diameter surface of the upper pile 1b at the insertion port distal end side. A shaft that engages with the receiving portion 2 continuously with the male transmission portion 5 in the axial direction is formed on the outer diameter surface on the base side of the insertion opening, while the male transmission portion 5 as the flat portion 11 is formed. An insertion portion 6 having a circular cross section in the center is formed. And the level | step difference surface 4 is formed in a part between this male transmission part 5 and the insertion part 6. FIG. The male transmission portion 5, the insertion portion 6 and the step surface 4 are integrally formed by a casting method.

  The maximum outer dimension in the axial direction of the male transmission part 5 and the maximum outer dimension in the axial direction of the female transmission part 3, and the inner diameter of the receiving part 2 and the outer diameter of the insertion part 6 are almost all. Molded to the same dimensions.

  Further, both the lower pile 1a and the upper pile 1b are respectively formed with bolt holes 8 through which bolts 7 for preventing the piles 1a and 1b from coming off are connected.

  When the insertion port of the upper pile 1b is inserted into the receiving port of the lower pile 1a, the female transmission unit 3 and the male transmission unit 5 are engaged, and the receiving unit 2 and the insertion unit 6 are engaged. Then, in this inserted state, the bolt 7 is provided with the bolt 7 and fixed with the washer 9 and the nut 10. Thereby, both piles 1a and 1b are prevented from coming off.

  In the inserted state of both piles 1a and 1b, the maximum outer dimensions of both transmission parts 3 and 5 and the inner diameter of the receiving part 2 and the outer diameter of the inserting part 6 are almost the same size, so both are tightly spaced. Engage without. For this reason, as demonstrated in 1st embodiment, when the bending moment which bends pile 1a, 1b acts, the deflection | deviation produced by it can be suppressed effectively. In the second embodiment, the gap between the transmission parts 3 and 5 is not generated. However, as in the first embodiment, a play is provided between the transmission parts 3 and 5 so that the female transmission is performed. It is also possible to make the inner surface of the part 3 less likely to be damaged.

  Except for the shapes of the transmission parts 3 and 5, the first and second embodiments have the same function, and therefore, the description overlapping the description in the first embodiment is omitted.

  One Embodiment of the connection member 12 of the pile driving machine 19 which concerns on this invention is shown in FIG.

  In this configuration, on one end side of the rod-shaped connecting member 12, a male engaging with the female transmission portion 3 whose axial center cross-sectional shape formed on the inner diameter surface of the pile 1 shown in FIG. While the shape transmission part 5 is formed, the axial cross section which engages with the receiving part 2 of the pile 1 on the base side of the male transmission part 5 is continuous with the male transmission part 5 in the axial direction. A circular insertion portion 6 is formed. A step surface 4 is formed between the male transmission portion 5 and the insertion portion 6. The male transmission portion 5, the insertion portion 6, and the stepped surface 4 are integrally formed by a casting method, but can be processed by external grinding.

  On the other hand, a connecting portion 14 that is connected to the rotary shaft 13 of the pile driving machine 19 is formed on the inner surface on the other end side of the connecting member 12. A fixed groove 15 and a fixed hole 16 are respectively formed in the rotary shaft 13 and the connecting portion 14. The rotary shaft 13 is inserted into the connecting member 12, and a fixed pin 17 is inserted into the fixed groove 15 and the fixed hole 16. Is provided, the rotating shaft 13 and the connecting member 12 are connected. Furthermore, the male transmission part 5 and the insertion part 6 of the connection member 12 are inserted into the female transmission part 3 and the reception part 2 formed on the receiving port side of the pile 1, and the connection member 12 and the pile 1 are connected. After this connection, a bolt 7 penetrating the pile 1 and the connecting member 12 is provided and fixed with a washer 9 and a nut 10. Thereby, the pile 1 and the connecting member 12 are prevented from coming off.

  One Embodiment of the connection mechanism of the rotating shaft 13 and the pile 1 of the pile driving machine 19 which concerns on this invention is shown in FIG.

In this configuration, the axial transmission section formed on the inner diameter surface on the back side of the receiving port of the pile 1 is related to the hexagonal female transmission section 3 at the tip of the rotary shaft 13 of the pile driving machine 19 shown in FIG. A mating male transmission portion 5 is formed, and an axial center that is continuous with the male transmission portion 5 in the axial direction on the base side of the male transmission portion 5 and engages with the receiving portion 2 of the pile 1. An insertion portion 6 having a circular cross section in the direction is formed. A step surface 4 is formed between the male transmission portion 5 and the insertion portion 6. The male transmission portion 5, the insertion portion 6, and the step surface 4 are integrally formed by a casting method, but can be processed by external grinding.
In this way, by setting the rotating shaft 13 and the connecting member 12 shown in FIG. 6 to be integrated, the pile 1 can be fitted into the rotating shaft 13 more easily.

DESCRIPTION OF SYMBOLS 1 Pile 1a Lower pile 1b Upper pile 2 Receiving part 3 Female transmission part 4 Step surface 5 Male transmission part 6 Insertion part 7 Bolt (locking member)
8 bolt hole 9 washer 10 nut 11 flat part 12 connecting member 13 rotating shaft 14 connecting part 15 fixing groove 16 fixing hole 17 fixing pin 18 excavating part 19 pile driver 20 pile receiving part 21 locking piece 22 protrusion

Claims (10)

A receiving portion (2) having a circular cross section in the axial direction is formed on the inner diameter surface of the receiving end of one pile (1) made of a tubular body, and the receiving portion (2 ) And the axial direction, the axial cross section forms a non-circular female transmission part (3),
A male transmission part (5) that engages with the female transmission part (3) is formed on the outer diameter surface of the other pile (1) made of a tubular body on the distal end side of the insertion opening, On the outer diameter surface, an insertion portion (6) that engages with the receiving portion (2) is formed continuously in the axial direction with the male transmission portion (5),
When the other pile (1) is inserted into the one pile (1) to embed the pile (1), rotational torque is generated by the engagement of the female transmission section (3) and the male transmission section (5). On the other hand, the engagement between the receiving portion (2) and the insertion portion (6) prevents the two piles (1, 1) from being relatively bent at that portion. Pile joint structure.   The pile joint structure according to claim 1, wherein both of the female transmission part (3) and the male transmission part (5) have polygonal cross-sectional shapes.   The maximum outer dimension in the axial direction of the male transmission part (5) is made smaller than the maximum outer dimension in the axial direction of the female transmission part (3), and the two piles (1, 1) are connected. While allowing one pile (1) to rotate relative to the other pile (1) by a predetermined angle around the axis in the state, the male transmission portion (5) has a maximum outer diameter in the axial center direction. The pile joint structure according to claim 2, wherein the dimension is larger than the minimum inner dimension in the axial direction of the female transmission part (3).   The pile joint structure according to claim 2 or 3, wherein the polygon is a hexagon.   The pile according to claim 1, wherein the shape of the cross section in the axial direction of the female transmission portion (3) and the male transmission portion (5) is a shape obtained by cutting off a part of the circumference with at least one plane. Joint structure.   In the state where the other pile (1) is inserted into the one pile (1), a locking member (7) interposed between the two piles (1, 1) is provided to prevent the piles (1) from coming off. The pile joint structure according to any one of claims 1 to 5, wherein the pile joint structure is provided. Engage with the female transmission part (3) having a non-circular cross section in the axial direction formed on the inner diameter surface of the pile (1) at the back of the receiving port of the pile (1) on the tip side of the rotary shaft (13) of the pile driver A male transmission part (5) is formed, and on the base side of the male transmission part (5), the male transmission part (5) is continuous with the male transmission part (5) in the axial direction, and the receiving end side of the pile (1) An insertion portion (6) that is formed on the inner diameter surface of the shaft and engages with the receiving portion (2) having a circular cross section in the axial direction,
When the tip end side is inserted into the receptacle of the pile (1) and the pile (1) is embedded, rotational torque is transmitted by the engagement of the female transmission portion (3) and the male transmission portion (5). On the other hand, the engagement between the receiving portion (2) and the insertion portion (6) prevents relative rotation of the rotating shaft (13) and the pile (1) at that portion. Pile joint structure.   The pile joint structure according to claim 7, wherein both of the cross sections in the axial direction of the female transmission part (3) and the male transmission part (5) are hexagonal. A male transmission part that engages with a female transmission part (3) having a non-circular cross section in the axial direction formed on the inner diameter surface on the back side of the receiving port of the pile (1) on one end side of the rod-shaped connecting member (12) (5) is formed on the base side of the male transmission part (5) and continuously on the male transmission part (5) in the axial direction on the inner diameter surface of the receiving end of the pile (1). The insertion portion (6) that engages the receiving portion (2) having a circular cross section in the axial direction is formed,
On the other end side of the connecting member (12), a connecting portion (14) connected to the rotary shaft (13) of the pile driving machine (19) is formed,
When the one end side is inserted into the receptacle of the pile (1) and the pile (1) is embedded, the male transmission portion (5) and the female transmission portion (3) of the pile (1) are rotated by engagement. While the torque is transmitted, the piles (1, 1) are relatively bent at the insertion portion by the engagement between the receiving portion (2) and the insertion portion (6). A connecting member for connecting the pile driving machine (19) and the pile (1) to prevent the pile.   The connecting member according to claim 9, wherein both the axial cross sections of the female transmission part (3) and the male transmission part (5) are hexagonal.

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