JP2006077482A - Steel pipe pile structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steel pipe pile structure without slipping out a coupling member of a joining member, while facilitating joining at a job site, without requiring special work such as threading a steel pipe, when forming a long size steel pipe pile by joining a plurality of steel pipes. <P>SOLUTION: This steel pipe pile structure is formed of steel pipes 1 and 2 vertically continuously arranged in the longitudinal direction, the coupling member 3 interposed between the steel pipes 1 and 2, respectively fitting an end part of the steel pipes 1 and 2 to both end sides and having a projection part 3a for respectively allowing the end part of the steel pipes 1 and 2 to abut on a central part inner surface, and a screw bar 4 penetratingly arranged in the steel pipes 1 and 2 and the coupling member 3 in the steel pipes 1 and 2 and the coupling member 3 and having both end parts fixed to the end part of the steel pipes 1 and 2. End plate parts 1b and 2b are respectively arranged in the end part of the steel pipes 1 and 2. End parts 4a and 4b of the screw bar 4 respectively penetrate through a through-hole 1a of the end plate part 1b and a through-hole 2a of the end plate part 2b, and respectively threadedly engage fixing nuts 5 and 6 with both end parts. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a steel pipe pile structure formed by joining a plurality of steel pipes in the longitudinal direction.

  Conventionally, the means for joining steel pipes as piles in the longitudinal direction is usually welded joining. However, in the case of welding joining, it is necessary to cover a shade or the like in order to weld in the rain (for example, Patent Document 1). Moreover, in order to obtain a good joining result in welding work, skilled techniques are required. Therefore, welding by non-experts often results in poor welding.

  Therefore, there is a proposal that a steel pipe pile is formed by joining a steel pipe in its longitudinal direction by using a coupling member having a female screw part that is screwed into the end of the steel pipe and screwed to the end (for example, Patent Document 2).

  However, when a male pipe portion is provided on a steel pipe to be joined by screwing, there is a problem that screwing becomes difficult if earth or sand enters the screw part in a steel pipe erection operation or the like.

  On the other hand, a structure has been proposed in which upper and lower steel pipes are joined via a cylindrical joining pipe in order to facilitate on-site joining without requiring special processing (see, for example, Patent Document 3).

On the other hand, instead of joining long piles together, short hollow concrete members with a large number of rebar insertion holes formed in the concrete part are used to join short pile members into long piles. It has also been proposed to form a long pile by connecting many hollow concrete members in the longitudinal direction and joining the hollow concrete members with reinforcing bars arranged in the reinforcing bar insertion holes (for example, see Patent Document 4).
Japanese Unexamined Patent Publication No. 20004-150157 (particularly paragraph number [0002], summary) JP-A-6-193055 (especially summary) Japanese Patent Laid-Open No. 10-273912 (especially summary) JP 55-95713 A (especially claim 4, drawings)

  When screwing steel pipes as in the above-mentioned Patent Document 2, there is a problem that mechanical force is required to screw the steel pipe having a large diameter, and upper and lower pile ends as in the above-mentioned Patent Document 3. If it is possible to move relative to the pile axis direction in the joint pipe, the joint pipe may be detached from the upper and lower pile ends.

  Furthermore, although it is possible with a concrete member to provide the reinforcing-bar insertion hole in the thick part of a pile like patent document 4, it cannot apply in the case of a steel pipe.

  An object of the present invention is to provide a steel pipe pile structure that does not require special processing such as cutting a screw in a steel pipe, is easy to be joined on site, and does not cause a coupling member of the joining member to come off. .

  The steel pipe pile structure according to claim 1 is interposed between a plurality of steel pipes arranged in the longitudinal direction and the steel pipe and the steel pipe, and the end portions of the steel pipes are respectively along the inner surface side of the peripheral wall portion. The fitted peripheral wall portion and the coupling member having a protrusion at the inner central portion of the peripheral wall portion, and the steel pipe and the coupling member are disposed so that both ends are fixed to the end portion of the steel pipe. It is formed from a bar material.

  In the present invention, a plurality of steel pipes arranged in the longitudinal direction are joined to each other through a coupling member having at least a protrusion having a thickness width of the steel pipe on the inner surface of the central portion, thereby cutting a screw on the steel pipe. It does not require special processing, can be easily joined on site, and can easily form a steel pipe pile that does not come off the coupling member during construction, etc. In addition, when the steel pipe is a pile body, it can be applied not only to join the pile bodies into a long steel pipe pile of any length, but also to easily combine a plurality of short steel pipes into a normal length steel pipe pile. Can be formed.

  In this case, if the bar material itself can be extended to an arbitrary length by using a threaded joint method, etc., a short steel pipe can be connected even at construction sites where there is a structure or the like on the upper part and the height is restricted. After this is buried, construction can be performed by connecting a short steel pipe to the upper part.

  The steel pipe pile structure according to claim 2, wherein in the steel pipe pile structure according to claim 1, at least an end portion of the bar is provided with a male screw portion, and the end portion of the bar is an end portion of the steel pipe. And is fixed to the end plate portion by a fixing nut screwed into the male screw portion.

  The bar material in this case may be a bar material having a male screw portion only at a portion where the male screw portion is necessary, for example, the male screw portion only at both ends of the bar material, but having a male screw portion over the entire length from the viewpoint of versatility. Is preferred. As a preferable usage mode, for example, a steel pipe in which a bar continuously penetrates through a plurality of steel pipes arranged in a longitudinal direction via a coupling member, and male thread portions at both ends thereof are arranged at both ends. A plurality of steel pipes are joined by passing through the end plate portion and screwing a fixing nut to the male screw portion to fix the end portion of the bar to the end plate portion.

  The steel pipe pile structure according to claim 3 is characterized in that, in the steel pipe pile structure according to claim 1 or 2, the protruding portion of the coupling member is projected to the extent that it allows penetration of the bar material. .

  When joining a plurality of steel pipes via a coupling member, the steel pipes are arranged one above the other via the coupling member. First, the coupling member and its lower steel pipe are combined, and then the coupling member It is a preferred joining method to combine the upper steel pipe on the top.

  In this joining step, when the lower steel pipe and the coupling member are combined, it is easier to join the upper steel pipe if they are integrated. That is, as in the steel pipe pile structure according to claim 3 described above, the protrusion of the coupling member protrudes to the extent that allows the bar material to penetrate. The penetrating bar can be tightened with a fixing nut on the upper side of the projection of the coupling member and on the lower side of the end plate of the steel pipe, thereby integrating the lower steel pipe and the coupling member. Therefore, the upper steel pipe can be easily joined.

  The steel pipe pile structure according to claim 4 is the steel pipe pile structure according to claim 2 or 3, wherein the end plate portion is a cap-like end plate formed so that an end portion of the steel pipe can be fitted. It is what.

  If a cap-shaped end plate formed separately from the steel pipe is prepared as the end plate portion of the steel pipe end, it is not necessary to provide the end plate portion integrally with the end of the steel pipe. Since it can be set as a cylindrical shape, it is especially preferable.

  Even when such a cap-shaped end plate is used, a cap-shaped end plate, a steel pipe, a coupling member, a steel pipe, through a bar inserted through the center of the steel pipe through the cap-shaped end plate, By joining them in the order of the cap-shaped end plates, a steel pipe pile in which they are integrated can be easily formed.

  The steel pipe pile structure according to claim 5 is characterized in that, in the steel pipe pile structure according to any one of claims 1 to 4, a spiral wing is provided on the outer periphery of the coupling member.

  The steel pipe pile structure according to claim 6 is characterized in that, in the steel pipe pile structure according to any one of claims 2 to 5, a spiral wing portion is provided on an outer periphery of the end plate portion.

  According to invention of Claim 5 and 6, since it has a helical wing | blade part in the outer periphery of a coupling member or a cap-shaped end plate, since a steel pipe pile can be screwed and installed in the ground, efficiency Construction is possible, and the friction with the surrounding ground is large, so that the bearing capacity of the pile can be remarkably increased.

  In addition, the coupling member or the cap-shaped end plate having the spiral wing portion can be freely combined with the coupling member or the cap-shaped end plate having no spiral wing portion. With a spiral wing of any shape by appropriately setting the position, quantity, installation interval of the coupling member having the wing, and whether or not to use the cap-shaped end plate having the spiral wing Steel pipe piles can be easily formed.

  According to the steel pipe pile structure described in claim 1 of the present invention, a plurality of steel pipes arranged in the longitudinal direction are arranged with a coupling member interposed therebetween and continuously penetrated through the steel pipe and the coupling member. By joining with steel, it is possible to easily form steel pipe piles by joining multiple steel pipes at construction sites, etc. Since the end portion is fitted to the coupling member, there is no problem that the coupling member is detached from the end portion of the steel pipe during construction.

  Moreover, according to the steel pipe pile structure described in claim 2, particularly, an end plate portion is provided at an end portion of the steel pipe, and a male screw portion is provided at an end portion of the bar, and the end portion of the bar is the end plate portion. And fixed by a fixing nut screwed into the male screw portion, so that even a normal worker does not need special techniques such as welding, and a plurality of steel pipes are coupled with a coupling member and a bar. By joining with a fixing nut, a long steel pipe pile can be formed very easily.

  Moreover, according to the steel pipe pile structure of Claim 3, when connecting and connecting a some steel pipe to an up-down direction, the end plate of the steel pipe arrange | positioned at the lower end side is used as the bar which penetrated the steel pipe center part. It is possible to tighten firmly with fixing nuts on the outside of the part and the upper part of the projection of the coupling member, respectively, so that the lower steel pipe and the coupling member can be integrated, so that the upper steel pipe can be joined. It becomes easy.

  Moreover, according to the pile structure described in claim 4, the cap-shaped end plate formed separately from the steel pipe is prepared as the end plate portion of the steel pipe end portion, so that the end plate portion of the steel pipe is provided. It is very economical because not ordinary steel pipes can be used.

  Furthermore, according to the steel pipe pile structure described in claims 5 and 6, by having a spiral wing on the outer periphery of the coupling member or cap-shaped end plate, the shape of the coupling member or cap having the spiral wing By appropriately combining and installing the end plates, a steel pipe pile with an arbitrary shape of spiral wings can be easily formed.

  In addition, piles having wings on the outer periphery are generally bulky during transportation and storage, etc., and need curing of the wings. In the case of the present invention, a coupling member, a cap-shaped end plate, and a simple cylindrical shape are required. Since the steel pipes can be disassembled and transported individually, there is no problem such as deformation or bulkiness of the wings, and handling such as transportation is easy.

  The steel pipe pile structure of this invention is demonstrated concretely based on the example shown on drawing.

  The steel pipe pile illustrated by sectional drawing to FIG. 1 (a), (b) has the protrusion 3a in the steel pipe 1 and the steel pipe 2 and the center part inner surface which were arranged in the up-down direction, and the steel pipe 1 and the steel pipe 2 The coupling member 3 interposed therebetween is integrally joined by a screw rod 4 (hereinafter referred to as “screw rod 4”) which is a rod.

  As shown to Fig.1 (a), the lower end part of the steel pipe 1 and the upper end part of the steel pipe 2 are the through-hole 1a which the edge part of the screw rod 4 can penetrate, and the end plate parts 1b and 2b which have the through-hole 2a. Each is provided integrally. In addition, the coupling member 3 has a peripheral wall portion around it, and has a protrusion 3a at the center of the inner surface of the peripheral wall portion. The protrusion 3 a protrudes inward from the thickness width of the steel pipe 1 and the steel pipe 2.

  A state in which the steel pipe 1 and the steel pipe 2 shown in FIG. 1A are joined using the coupling member 3 and the screw rod 4 is shown in a sectional view in FIG. That is, the coupling member 3 is interposed between the steel pipe 1 and the steel pipe 2, and the ends of the steel pipe 1 and the steel pipe 2 are in the coupling member 3 so as to be along the inner surface side of the peripheral wall portion of the coupling member 3. The lower end portion of the screw rod 4 that is fitted, the screw rod 4 is continuously inserted into the steel pipe 1 and the steel tube 2 and the coupling member 3, and protrudes from the through hole 1a of the steel tube 1 and the through hole 2a of the steel tube 2, respectively. The fixing nuts 5 and 6 are screwed to the 4a and the upper end 4b, respectively, and tightened to form an integrated steel pipe pile structure. An external view of this state is shown in FIG.

  Although not shown in the drawings, as a procedure for such a configuration, for example, in the state where the fixing nut 5 is screwed to the lower end portion 4a of the screw rod 4 protruding from the through hole 1a of the steel pipe 1, the screw rod 4 is passed through the steel pipe 1, and then the coupling member 3 is placed on the upper end of the steel pipe 1, and the steel pipe 2 is built on the coupling member 3 in a state where the screw rod 4 penetrates the steel pipe 2. Then, after that, the fixing nut 6 is screwed into the upper end portion 4b of the screw rod 4 protruding from the through hole 2a of the steel pipe 2 and tightened to form an integrated steel pipe pile.

  In addition, although the example which joined the steel pipes 1 and 2 in which the end plate parts 1b and 2b were each provided integrally was shown in FIG. 1, as shown in FIG. 2, the end plate parts 1b and 2b are each integrated. In addition to the steel pipes 1 and 2 provided in the above, a cylindrical steel pipe 7 having no end plate portion may be installed and joined between the steel pipe 1 and the steel pipe 2. Of course, a large number of cylindrical steel pipes 7 may be used and joined. In this case, the number of coupling members 3 corresponding to the number of steel pipes 7 is set according to the number of steel pipes 7.

  In addition, as shown by reference numeral 3 in FIG. 3A, the coupling member is shown in FIGS. 1 and 2 if it has a structure in which the protruding portion 3a on the inner surface extends to the extent that the threaded rod 4 can be penetrated. Even when the end plate portion 1b is integrally provided as in the case of the steel pipe 1, as shown in FIG. 3A, the fixing nut 5 is provided on the lower end portion 4a of the screw rod 4 protruding toward the lower end portion side, and the protruding portion 3a. Since the steel pipe pile 1 and the coupling member 3 can be integrated by tightening the fixing nut 8 to the middle portion of the screw rod 4 protruding to the upper end side of the steel pipe, the steel pipe 2 is built on the coupling member 3 When attaching, there is no risk of the steel pipe 1 and the coupling member 3 wobbling or coming off, and the assembling work can be performed very safely.

  FIG. 3 (a) shows that both the steel pipe 1 and the steel pipe 2 are cylindrical steel pipes having no end plate portion, and the cap-like end plate 9 formed separately from the steel pipes 1 and 2 as end plate portions. If the cap-shaped end plates 9 and 10 are used, cylindrical steel pipes without end plate portions can be used as the steel pipes 1 and 2.

  Such cap-shaped end plates 9 and 10 are also secured to the steel pipes 1 and 2 by screwing and fixing the fixing nuts 5 and 6 to the upper and lower ends of the screw rod 4 and the fixing nut 8 to the intermediate portion. It can be set as the structure joined to the coupling member 3 integrally.

  Further, instead of using the single screw rod 4 shown in FIGS. 1 to 3 (a), as shown in FIG. It is also possible to use a connecting screw rod formed by joining two screw rods 4 penetrating each other, and as shown in FIG. 3C, a joint portion 12a having a female screw portion on the inner surface is integrated. It is also possible to use a connecting threaded rod obtained by joining the threaded rod 12 and the ordinary threaded rod 4 having no joint portion.

  FIG. 3D shows a joining state of the screw rod 4 and the screw rod 12 in FIG. A joint portion 12a having an internal thread on the inner surface protrudes from the upper end portion of the screw rod 12, and the screw rod 4 is a normal screw rod having no joint portion. Of course, even when the screw rod 12 shown in FIG. 3D is turned upside down, that is, when the screw rod 12 having the joint portion 12a at the lower end and the normal screw rod 4 are combined. Good.

  The above connecting screw rod can also be used when using a coupling member 3 having a small protrusion length of the protrusion 3a as shown in FIG. 1, but as shown in FIG. 3 (b) and FIG. 3 (c). It is preferable to use the coupling member 3 having a structure in which the protruding portion 3a on the inner surface extends to the extent that the screw rods 4 and 12 are allowed to pass therethrough.

  3 (b) and 3 (c) show the case where the above-described connecting screw rod is used in the steel pipe pile using the cap-shaped end plates 9, 10, the connecting screw rod is shown in FIG. 1 and the steel pipes 1 and 2 in which the end plate portions 1b and 2b shown in FIG. 2 are integrally provided.

  As described above, the connecting screw rod is preferably used particularly when a steel pipe pile having a normal length is formed by combining short steel pipes. That is, the lower steel pipe 1 and the coupling member 3 are combined. In the case of FIG. 3B, the fixing nuts 5 and 6 and the coupler 11 are tightened. In the case of FIG. The lower steel pipe 1 and the coupling member 3 can be integrated by positioning the joint 12a above the protrusion 3a of the ring member 3 and tightening the fixing nut 5.

  When joining a short steel pipe in this way, the steel pipe can be joined until the normal pile length is reached, but after the steel pipe 1 and the coupling member 3 in an integrated state are buried in the ground, Since the construction can be performed by joining the short steel pipe 2 on the upper side of the coupling member 3, it is advantageous when construction is performed at a construction site where there is a structure or the like on the upper portion and the height is restricted.

  4 (a) and 4 (b) show the structure of a steel pipe pile using a coupling member 13 having a spiral wing 13a on the outer periphery instead of the coupling member 3 shown in FIG. 4 (a) is a diagram corresponding to FIG. 1 (b), and FIG. 4 (b) is a diagram corresponding to FIG. 1 (c).

  5 (a) and 5 (b) show a cap-shaped end plate 14 having a spiral wing portion 14a on the outer periphery instead of the cap-shaped end plate 9 and the coupling member 3 shown in FIG. The structure of the steel pipe pile which has the helical wing | blade part 14a in the lower end outer peripheral part of a steel pipe pile and the helical wing | blade part 13a in the intermediate part outer peripheral part by using the above-mentioned coupling member 13 is shown, respectively.

  Of course, although not specifically shown, it is also possible to use a cap-shaped end plate having a spiral wing on the outer periphery instead of the cap-shaped end plate 10 shown in FIG. 3, or a cap having a spiral wing on the upper end. It is also possible to use a cap-shaped end plate without a spiral wing at the lower end.

  Thus, the steel pipe pile which has a spiral wing part in an arbitrary part can be easily formed by using the coupling member which has a spiral wing part, or a cap-shaped end plate.

  Moreover, when setting it as the steel pipe pile with a spiral wing | blade which has these spiral wing | blade parts, it is also possible to join a plurality of steel pipes and make it a normal pile length similarly to the case where the said short steel pipe is joined. However, as a structure in which the protruding portion 13b of the coupling member 13 having the spiral wing portion 13a is protruded to an extent that allows the penetration of the bar, it is integrated with the lower steel pipe 1 in the ground. Since the construction can be performed by joining the steel pipe 2 on the coupling member 13 after being buried, it is advantageous when construction is performed at a construction site where there is a structure or the like on the upper portion and the height is restricted.

  In order to make sure that the spiral wing 13a of the coupling member 13 bites into the ground and is securely screwed into the ground, that is, the rotational force applied to the upper steel pipe 2 is reliably applied to the coupling member 13. In order to convey, for example, as shown in FIGS. 6 (a) and 6 (b), while projecting bodies 15 and 15 projecting downward on the inner surface of the lower end portion of the steel pipe 2 are projected by welding or the like, the coupling member 13 is provided. The protrusion 13b is provided with notches 13c and 13c into which the protrusions 15 and 15 can be inserted, and the lower end of the steel pipe 2 is fitted into the coupling member 13 and at the same time the protrusions 15 and 15 are notched 13c, What is necessary is just to make it the structure inserted in 13c.

  Moreover, while providing the protrusions 16 and 16 projecting upward on the inner surface of the upper end of the steel pipe 1, notches 13d and 13d into which the protrusions 16 and 16 can be inserted are provided on the protrusion 13b of the inner surface of the coupling member 13. By fitting the upper end of the steel pipe 1 into the coupling member 13 and simultaneously inserting the protrusions 16 and 16 into the notches 13d and 13d, the rotational force of the steel pipe 2 is passed through the coupling member 13. It can also be reliably transmitted to the steel pipe 1.

  In this case, the protrusions 15 and 15 and the cutout portions 13c and 13c, the protrusions 16 and 16 and the cutout portions 13d and 13d are formed to face the diameter direction of the steel pipes 1 and 2 and the coupling member 13, respectively. In addition, the protrusions 15 and 15 and the notches 13c and 13c and the protrusions 16 and 16 and the notches 13d and 13d are shifted by approximately 90 ° in the circumferential direction of the steel pipes 1 and 2 and the coupling member 13. Is formed.

  When the protruding portion 13b of the coupling member 13 is protruded to a length that allows the threaded rod 4 to penetrate, instead of providing the notched portion 13c in the protruding portion 13b, for example, FIG. As shown in (b), insertion holes 13e and 13e into which the protrusions 15 and 16 can be inserted may be provided. FIG. 8 is a perspective view of the steel pipes 1 and 2 illustrated in FIGS. 6 and 7.

  Although not particularly shown, instead of projecting the projecting bodies 15 and 16 on the inner surfaces of the steel pipes 2 and 1, respectively, the lower end portion of the steel pipe 2 and the upper end section of the steel pipe 1 are cut, and the projecting body 15 and the steel pipe itself are cut. A protrusion corresponding to 16 may be provided.

  In that case, the protrusion length of the protrusion 13b of the coupling member 13 can be reduced, and the insertion hole 13e can also be provided at the position of the protrusion of the steel pipe itself.

  As described above, the protrusions are provided on the steel pipe, and the notches 13c and the protrusions 15 and 16 of the steel pipes 1 and 2 can be inserted into the protrusions 13b of the coupling member 13 having the spiral wings 13a. By providing the insertion hole 13e, the rotational force applied to the upper steel pipe 2 can be reliably transmitted to the spiral wing portion 13a of the coupling member 13 and the spiral wing portion 14a of the cap-shaped end plate 14, and the spiral shape The wing parts 13a and 14a can be bitten into the ground and can be smoothly screwed.

  Although not shown in FIGS. 6 and 7, when a cap-like end plate that can be fitted to the end of the steel pipe is used, a protrusion is also provided on the lower side of the lower steel pipe 1 ( In some cases, a protrusion is also provided on the upper side of the upper steel pipe 2), and a recess or hole for inserting the protrusion is provided in the cap-shaped end plate so as to correspond to the position corresponding to the protrusion. Even when a spiral wing is provided on the cap-shaped end plate on the side, the rotational force applied to the upper steel pipe 2 can be reliably transmitted to the spiral wing projecting from the lower cap-shaped end plate. Thus, the spiral wing can be surely bitten into the ground or the like and can be screwed in smoothly.

  The present invention can easily form a long steel pipe pile by joining a plurality of steel pipes in the longitudinal direction with a coupling member interposed therebetween.

The steel pipe pile structure of this invention is shown, (a), (b) is a longitudinal cross-sectional view, (c) is a side view. The steel pipe pile structure of this invention is shown, (a) is a longitudinal cross-sectional view, (b) is a side view. The steel pipe pile structure of this invention is shown, (a), (b), (c) is a longitudinal cross-sectional view, (d) is a side view of a screw rod. The steel pipe pile structure with a helical wing | blade part of this invention is shown, (a) is a longitudinal cross-sectional view, (b) is a side view. The steel pipe pile structure with a helical wing | blade part of this invention is shown, (a) is a longitudinal cross-sectional view, (b) is a side view. The junction part of a steel pipe and a coupling member is shown, (a) is a longitudinal cross-sectional view of a steel pipe end part and a coupling member, (b) is the II line cross section in (a). The junction part of a steel pipe and a coupling member is shown, (a) is a longitudinal cross-sectional view of a steel pipe end part and a coupling member, (b) is a roll line cross section in (a). It is a perspective view which shows the edge part of a steel pipe.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lower steel pipe 1a Through hole 1b End plate part 2 Upper steel pipe 2a Through hole 2b End plate part 3 Coupling member 3a Protrusion part
4 Screw rod (bar material)
DESCRIPTION OF SYMBOLS 5 Fixing nut 6 Fixing nut 7 Steel pipe 8 Fixing nut 9 Cap-shaped end plate 10 Cap-shaped end plate 11 Coupler 12 Screw rod 12a Female thread part 13 Coupling member 13a Spiral blade part 13b Protrusion part 13c Notch part 13d Notch Notch 13e Insertion hole 14 Cap-shaped end plate 14a Spiral wing 15 Protrusion 16 Protrusion

Claims (6)

  A plurality of steel pipes arranged in the longitudinal direction, a peripheral wall part interposed between the steel pipes and the steel pipe, and fitted with the end parts of the steel pipes along the inner surface side of the peripheral wall part, and the peripheral wall thereof A coupling member having a protrusion at the inner central portion of the portion, and a bar member that is disposed through the steel pipe and the coupling member and that has both ends fixed to the end of the steel pipe. Steel pipe pile structure characterized by   A male screw part is provided at least at an end of the bar, and the end of the bar penetrates an end plate that is an end of a steel pipe and is fixed to the end plate by a fixing nut screwed into the male screw. The steel pipe pile structure according to claim 1, wherein the steel pipe pile structure is fixed to a portion.   3. The steel pipe pile structure according to claim 1, wherein the protruding portion of the coupling member is protruded to an extent that allows the bar material to pass therethrough.   4. The steel pipe pile structure according to claim 2, wherein the end plate portion is a cap-like end plate formed so that the end portion of the steel pipe can be fitted.   The steel pipe pile structure according to any one of claims 1 to 4, wherein a spiral wing is provided on an outer periphery of the coupling member. The steel pipe pile structure according to any one of claims 2 to 5, wherein a spiral wing portion is provided on an outer periphery of the end plate portion.

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