JP2005207081A - Joint structure of steel pipe pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint structure of a steel pipe pile facilitating steel pipe pile body joining work, low in machining cost with simple constitution, and stable in quality such as strength with excellent perpendicularity of the constructed steel pipe pile. <P>SOLUTION: In this joint structure, cutout grooves 12, 20 are axially formed at the respective joint ends of steel pipe pile bodies 101, 102, and insertion holes 13, 21 are bored in parts into which a sheath tube 103 is inserted, almost orthogonally to the axis of the steel pipe pile bodies 101, 102. The outer periphery of the sheath tube 103 is provided with projecting parts 30 to be fitted into the cutout grooves 12, 20, and insertion holes 31 bored in positions corresponding to the insertion holes 12, 20. The sheath 103 is inserted into the respective joint ends by fitting the projecting parts 30 into the respective cutout grooves 12, 20, and bolts 33 are inserted through the respective insertion holes 13, 20 and the insertion holes 31 of the sheath tube 103. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a joint structure in which steel pipe pile bodies are coaxially joined to each other in a steel pipe pile that is buried in the ground and supports the foundation of a building.

  As a pile for supporting the foundation of a building, a steel pipe pile 90 in which a spiral blade 92 is provided on the outer periphery of the tip of a steel pipe pile main body 91 is conventionally known as shown in FIG. The steel pipe pile 90 is pressed into the ground while being rotated by a construction machine 9 such as an earth auger installed on the ground, and can be buried in the ground without draining. There is an advantage that the supporting force is increased by the projected area in the horizontal direction. The length of the steel pipe pile 90 is, for example, a relatively short length of about 3 to 4 meters in a general house and about 17 to 18 meters. On the other hand, the length of the steel pipe pile 90 used as a material for the steel pipe pile main body 91 is fixed. Since the scale is 6 meters, when the steel pipe pile 91 having a length of 6 meters or more is buried, the steel pipe pile main body 93 without the spiral blade 92 is joined to the steel pipe pile main body 91.

  Thus, when joining the steel pipe pile main body 91 and the steel pipe pile main body 93 to make the steel pipe pile 90 having a total length of 6 meters or more, the steel pipe pile main body 91 and the steel pipe pile main body 93 are jointed in advance at a factory or the like. It is difficult to carry it into the truck due to the loading of a transport vehicle such as a truck on the loading platform or road conditions. Therefore, a construction method is adopted in which the steel pipe pile main body 91 and the steel pipe pile main body 93 are separated into the construction site and joined at the construction site. FIG. 15 shows a joint portion between the steel pipe pile main body 91 and the steel pipe pile main body 93. Two cylindrical sheath pipes 95 having a convex portion 94 having a predetermined width formed at the substantially outer periphery center are to be joined. The steel pipe pile main body 91 and the steel pipe pile main body 93 are joined on the coaxial line by being inserted in the steel pipe pile main body 91 and the steel pipe pile main body 93, respectively, and welding the gap formed by the convex portion 94. At the construction site, if the steel pipe pile main body 91 provided with the spiral blade 92 at the tip is rotationally press-fitted into the ground by the drive machine 9 and is press-fitted to the vicinity of the proximal end of the steel pipe pile main body 91, the steel pipe pile main body 91 The steel pipe pile main body 93 is joined and further rotationally press-fitted, whereby the steel pipe pile 90 is embedded.

  Although not shown in the figure, instead of welding as described above, screw holes are formed in the steel pipe pile main bodies 91 and 93 and the sheath pipe 95, respectively. A structure in which the main body is fixed by screwing is known (see Patent Document 1).

JP 11-81304 A

  However, when the steel pipe pile main body 91 and the steel pipe pile main body 93 are joined at the construction site, the steel pipe pile main body 93 is welded in a state of being suspended in a crane or the like with the steel pipe pile main body 91 pressed into the ground to some extent. Such welding work is time consuming, and may not be possible in rainy weather, and also requires welding equipment and workers. In addition, there is a problem that the strength of the welded joint portion varies depending on the skill of the operator and the quality of the steel pipe pile such as rotation transmission and strength of the joined portion becomes unstable. Therefore, a joint structure that can join the steel pipe pile main body 91 and the steel pipe pile main body 93 by a simple work other than welding is desired.

  On the other hand, in the structure in which the steel pipe pile main bodies 91 and 93 and the sheath pipe 95 are fixed by screwing, the above-described problems due to welding are solved, but the rotational force of the steel pipe pile main body 93 is transmitted to the steel pipe pile main body 93 via screws. As a result, a shearing force is applied to the screw and the screw may be damaged. Moreover, in order to disperse the shearing force applied to the screws, a plurality of screws are provided and fixed in the circumferential direction of the steel pipe pile main bodies 91 and 93. However, if a plurality of screw holes are formed or the number of screws increases, the cost increases. There is a problem that it takes a long time for screwing work. Moreover, since the steel pipe pile main bodies 91 and 93 are embed | buried under the ground, when storing at a construction site or during construction work, soil may adhere to a screw hole. Therefore, when screwing, it is necessary to clean each screw hole with a brush or the like, and work efficiency is not good.

  The present invention has been made in view of these points, the work of joining the steel pipe pile main body is easy, the processing cost is low with a simple configuration, and the verticality of the constructed steel pipe pile is good. It aims at providing the joint structure of the steel pipe pile where quality, such as intensity, was stable.

  The present invention is a steel pipe pile joint structure in which a sheath pipe is inserted into a joint end of a steel pipe pile main body, and the steel pipe pile main body is joined on a coaxial line, and each steel pipe pile main body has an axis line at the joint end. Notch grooves are respectively formed in the direction, and insertion holes are respectively drilled in a direction substantially perpendicular to the axis of the steel pipe pile main body in a portion where the sheath pipe is inserted, and the sheath pipe is formed on the outer periphery. Protrusions that fit into the respective notch grooves are provided, and insertion holes are formed at positions corresponding to the respective insertion holes, and the sheath tube is connected to each of the projections. The steel pipe pile main body is respectively fitted with a notch groove and inserted into each joint end, and a fastener is inserted into the insertion hole of each steel pipe pile main body and the insertion hole of the sheath pipe.

  Further, according to the present invention, the diameters of the insertion holes of the steel pipe pile main bodies and the sheath pipes are such that the steel pipe pile main bodies in the joined state through which the fasteners are inserted can rotate within a predetermined range from each other about the axis. As the size, the fasteners are inserted into the insertion holes, and the steel pipe pile main bodies are fixed to the drawing direction in a state of being rotatable relative to each other about the axis, and each fitting is made by fitting the notch groove and the convex portion. The rotational force of the steel pipe pile transmitted between the steel pipe pile main body and the sheath pipe is not applied to the fastener.

  Further, the present invention is a steel pipe pile joint structure in which a sheath pipe is inserted into a joint end of a steel pipe pile main body, and the steel pipe pile main body is joined on a coaxial line, and one steel pipe pile main body has a joint end. A notch groove is formed in the axial direction, and an insertion hole is bored in a direction substantially perpendicular to the axis of the steel pipe pile main body in the portion where the sheath pipe is inserted, and the other steel pipe pile main bodies are A convex piece that fits in the axial direction in the notch groove of the one steel pipe pile main body is provided at the joint end, and an insertion hole is formed in a direction substantially orthogonal to the axis of the steel pipe pile main body in a portion where the sheath pipe is inserted. Each of the sheath pipes is formed with an insertion hole at a position corresponding to each of the insertion holes, and the joint end of one steel pipe pile body is connected to the notch groove and the other. Of the steel pipe pile main body so that the projecting piece of the steel pipe pile main body is fitted to the joint end of the other steel pipe pile main body, the sheath pipe is inserted into each joint end, One wherein the insertion hole and fastener insertion hole of the sheath tube of the steel pipe pile body is inserted.

  Further, according to the present invention, the diameters of the insertion holes of the steel pipe pile main bodies and the sheath pipes are such that the steel pipe pile main bodies in the joined state through which the fasteners are inserted can rotate within a predetermined range from each other about the axis. As the size, the fasteners are inserted into the insertion holes, the steel pipe pile main bodies are fixed with respect to the drawing direction in a mutually rotatable state about the axis, and each fitting is made by fitting the notch groove and the convex piece. The rotational force of the steel pipe pile transmitted between the steel pipe pile main bodies is prevented from being applied to the fastener.

  Further, the present invention is a steel pipe pile joint structure in which a sheath pipe is externally fitted to a joint end of a steel pipe pile body, and the steel pipe pile body is joined on a coaxial line. The outer periphery of the end is formed in a polygonal shape, and insertion holes are respectively drilled in a direction substantially orthogonal to the axis of the steel pipe pile main body in a portion where the sheath pipe is fitted, and the sheath pipe is The inner circumference is formed in a polygonal shape corresponding to the joint end of the steel pipe pile body, and insertion holes are respectively drilled at positions corresponding to the insertion holes. It is characterized in that it is fitted to each joint end of the pile body and fitted to each joint end, and a fastener is inserted through the insertion hole of each steel pipe pile body and the insertion hole of the sheath tube.

  According to the joint structure of a steel pipe pile according to the present invention, the steel pipe pile body is positioned on the coaxial line by inserting the sheath pipe into the joining end of each steel pipe pile body, and the convex part of the sheath pipe is joined. The steel pipe pile main bodies are fixed to each other in the press-fitting direction and the rotation direction by fitting with the notch grooves of each steel pipe pile main body, and the fasteners are inserted into the insertion holes of the steel pipe pile main bodies and the insertion holes of the sheath pipes. Since the steel pipe pile main bodies are fixed with respect to the drawing direction by being inserted, the steel pipe pile main bodies can be joined by a simple operation without performing welding or complicated screwing at the construction site. Further, since the joint structure is simple, there is an advantage that the processing cost can be suppressed.

  Further, according to the present invention, the diameters of the insertion holes of the steel pipe pile main bodies and the sheath pipes are set so that the steel pipe pile main bodies in the joined state through which the fasteners are inserted rotate within a predetermined range from each other about the axis. As a possible size, the fastener is inserted into each insertion hole, each steel pipe pile main body is fixed to the drawing direction in a state where it can be rotated around the axis, and the notch groove and the projection are fitted to each other. Because the rotation force of the steel pipe pile transmitted between each steel pipe pile body and the sheath pipe is prevented from being applied to the fastener, an excessive load is applied to the fastener when the steel pipe pile is rotationally press-fitted. And there is no breakage of the fastener.

  Moreover, according to the joint structure of the steel pipe pile according to the present invention, the steel pipe pile main body is positioned on the coaxial line by inserting the sheath pipe into the joint end of each steel pipe pile main body. By fitting the notch groove and the convex piece of the other steel pipe pile main body, the steel pipe pile main bodies are fixed with respect to the press-fitting direction and the rotation direction, and are fastened to the insertion hole of each steel pipe pile main body and the insertion hole of the sheath pipe. By inserting the tool, the steel pipe pile main bodies are fixed to each other in the pulling direction, so that the steel pipe pile main bodies can be joined by simple work without welding or complicated screwing at the construction site. . Further, since the joint structure is simple, there is an advantage that the processing cost can be suppressed.

  Further, according to the present invention, the diameters of the insertion holes of the steel pipe pile main bodies and the sheath pipes are set so that the steel pipe pile main bodies in the joined state through which the fasteners are inserted rotate within a predetermined range from each other about the axis. As a possible size, the fasteners are inserted into the insertion holes, and the steel pipe pile main bodies are fixed with respect to the drawing direction in a state of being able to rotate relative to each other about the axis, and the notch groove and the protruding piece are fitted to each other. The rotational force transmitted between the steel pipe pile main bodies is prevented from being applied to the fastener, so that when the steel pipe pile is rotationally press-fitted, an excessive load is not applied to the fastener, and the fastener is not broken. Is prevented.

  Moreover, according to the joint structure of the steel pipe pile which concerns on this invention, the polygonal shape of the joint end of each steel pipe pile main body and the polygonal shape of the inner periphery of the sheath pipe fitted by this joint end fit. Therefore, the steel pipe pile main bodies are fixed in the drawing direction by fixing the steel pipe pile main bodies to each other in the press-fitting direction, and inserting the fasteners in the insertion holes of the steel pipe pile main bodies and the insertion holes of the sheath pipes. Therefore, the steel pipe pile main body can be joined by a simple operation without performing welding or complicated screwing at the construction site. Further, since the joint structure is simple, there is an advantage that the processing cost can be suppressed.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[First Embodiment]
FIG. 1 is a front view showing a configuration of a steel pipe pile according to the first embodiment of the present invention. As shown in the figure, the steel pipe pile 100 is obtained by joining two steel pipe pile main bodies 101 and 102 on a coaxial line via a sheath pipe 103. Since the steel pipe pile main bodies 101 and 102 and the sheath pipe 103 are each configured as separate members and can be easily joined at the construction site, the steel pipe pile main bodies 101 and 102 are the size of the loading platform of a transport vehicle such as a truck. The transportation efficiency can be increased as a length that takes into account the above. Further, even when the steel pipe pile main bodies 101 and 102 and the sheath pipe 103 are each manufactured in a desired separate factory, it is not necessary to transport both members to the factory where final assembly is performed, and each of them is directly separated. It can be carried into the construction site, thereby reducing transportation costs and the like. The configuration of the steel pipe pile 100 will be described in more detail.

  As shown in FIG. 1, the steel pipe pile main body 101 uses a steel pipe having the same diameter and length as a conventional steel pipe pile, and a spiral blade 10 and excavation claws 11 are provided at a tip portion thereof. The spiral wing 10 is fixed to the outer periphery of the steel pipe pile main body 101 to form a spiral surface, and when the steel pipe pile main body 101 is press-fitted into the ground, the role of propelling the steel pipe pile main body 101 downward. After press-fitting, the steel pipe pile main body 101 plays a role of supporting a vertical load. Such a spiral blade 10 is formed by forming a flat plate member having a constant thickness into a spiral shape having a substantially constant width, and is fixed to the outer periphery of the steel pipe pile main body 101 by welding or the like. Further, the lower end portion of the spiral blade 10 is processed into an acute angle shape that gradually widens from the inside. This makes it easier for the spiral blade 10 to be press-fitted into the ground, and the end portion of the spiral blade 10 is There is an advantage that it is difficult to be deformed when colliding with underground rocks. The shape of the spiral wing 10 shown in the present embodiment is an example. For example, the spiral wing 10 may be divided into a plurality of pieces, or the number of turns may be increased. Can be changed.

  Further, the excavation claws 11 are arranged in a circumferential direction so as to protrude downward from the tip of the steel pipe pile main body 101, and are used for excavating the ground when the steel pipe pile main body 101 is press-fitted into the ground. is there. The excavation claw 11 is preferably made of steel having high hardness so that it does not easily deform when colliding with underground rocks or the like, or a notch is formed at the tip of the steel pipe pile main body 101 to make the steel pipe pile main body 101. It can also be a drilling claw itself. Moreover, since the excavated earth and sand penetrate | invade from the front-end | tip of the steel pipe pile main body 101 to the inside space, in order to prevent this, you may seal the front-end | tip of the steel pipe pile main body 101 with a suitable cover.

  On the other hand, as shown in FIG. 2, a notch groove 12 is formed at the proximal end of the steel pipe pile main body 101, that is, at the joint end with the steel pipe pile main body 102. A pair of the notch grooves 12 are formed so as to be symmetrical with respect to the axis so as to be a constant width or slightly narrower downward in the circumferential direction of the steel pipe pile main body 101. An insertion hole 13 is formed below the notch groove 12. The insertion hole 13 is penetrated in a direction substantially orthogonal to the axis of the steel pipe pile main body 101, and is formed in a portion below the notch groove 12 where the sheath pipe 103 is inserted.

  As shown in FIG. 1, the steel pipe pile main body 102 uses a steel pipe having substantially the same diameter and length as the steel pipe pile main body 101. As shown in FIG. 2, a notch groove 20 is formed. The notch grooves 20 are formed in a pair so as to be symmetric with respect to the axis so as to be a constant width in the circumferential direction of the steel pipe pile main body 102 or slightly narrower toward the upper side, and the width and the notch depth are It is substantially the same as the notch groove 12. An insertion hole 21 is formed above the notch groove 20. The insertion hole 21 is penetrated in a direction substantially orthogonal to the axis of the steel pipe pile main body 102, and is formed in a portion above the notch groove 20 where the sheath pipe 103 is inserted.

  Similarly, a notch groove 20 and an insertion hole 21 are formed at the proximal end of the steel pipe pile main body 102. In the steel pipe pile 100 according to the present embodiment, the two steel pipe pile main bodies 101 and 102 are joined, but the length of the steel pipe pile to be buried depends on the softness of the ground and the required supporting force. Further, the steel pipe pile main body 102 is formed in consideration. Moreover, by forming the notch groove 20 and the insertion hole 21 at the front end and the base end of the steel pipe pile main body 102, the steel pipe pile main body 102 has no vertical direction and the construction becomes easy.

  As shown in FIGS. 1 and 2, the sheath tube 103 is made of a steel pipe having an outer diameter that is substantially the same as or slightly smaller than the inner diameter of the steel pipe pile main bodies 101 and 102, and the steel pipe pile main bodies 101 and 102 are joined together. The portions are inserted into the steel pipe pile main body 101 and the steel pipe pile main body 102, respectively. The length of the sheath pipe 103 is such a length that the steel pipe pile main bodies 101 and 102 can be maintained on the same axis, and if it is too long, construction and handling are inconvenient and cost is increased. Further, as shown in the figure, a convex portion 30 and an insertion hole 31 are provided on the outer periphery near the center of the sheath tube 103. The convex portion 30 is for fitting with the notch grooves 12 and 20 of the steel pipe pile main bodies 101 and 102 when inserted into the steel pipe pile main bodies 101 and 102, and the diameter from the outer peripheral surface of the sheath pipe 103. It is provided so as to protrude outward in the direction. The convex portion 30 is formed of a flat plate curved along the outer peripheral surface of the sheath tube 103, and a pair is fixed by welding or the like so as to be symmetric with respect to the axis. Further, the circumferential width of the protrusion 30 is slightly smaller than the circumferential width of the notch grooves 12 and 20 in order to facilitate the fitting with the notch grooves 12 and 20. On the other hand, the length of the convex part 30 in the axial direction is twice the notch depth of the notch grooves 12 and 20 so that the upper and lower sides of the convex part 30 can be fitted into the notch grooves 12 and 20, respectively. Moreover, it is preferable that the radial thickness of the convex portion 30 is equal to or greater than the thickness of the steel pipe pile main bodies 101 and 102. On the other hand, the insertion hole 31 is penetrated in a direction substantially orthogonal to the axis of the sheath tube 103, and the insertion holes 13, 21 of the steel pipe pile main bodies 101, 102 are respectively formed above and below the convex portion 30. It is drilled to correspond.

Hereinafter, the joining of the steel pipe pile main bodies 101 and 102 via the said sheath pipe 103 is demonstrated.
First, as shown in FIG. 3, the sheath tube 103 is inserted into the proximal end side of the steel pipe pile main body 101. The steel pipe pile main body 101 is rotated and press-fitted into the ground with a construction machine such as an earth auger (not shown) leaving the base end, and once stopped, the steel pipe pile main body 101 is removed from the construction machine and then on the ground. A sheath tube 103 is inserted into the proximal end of the steel pipe pile main body 101. Specifically, the sheath pipe 103 is inserted into the proximal end side of the steel pipe pile main body 101 so that the convex part 30 fits into the notch groove 12 of the steel pipe pile main body 101. By fitting the convex part 30 into the notch groove 12, the sheath pipe 103 is positioned with respect to the steel pipe pile main body 101, and the lower end 12a of the notch groove 12 and the lower end 30a of the convex part 30 are brought into contact with each other. It is supported by the steel pipe pile main body 101. In addition, there is a slight gap between the side end 12b of the notch groove 12 and the side end 30b of the convex portion 30 for easy fitting, but when the steel pipe pile main bodies 101, 102 are rotated, The side end 12b and the side end 30b come into contact with each other, the sheath pipe 103 is fixed in the rotational direction of the steel pipe pile main body 101, and the rotational force of the sheath pipe 103 is transmitted to the steel pipe pile main body 101.

  Next, as shown in FIG. 4, the steel pipe pile main body 102 is fitted so that the sheath pipe 103 is inserted into the steel pipe pile main body 102. The steel pipe pile main body 102 is suspended by a heavy machine such as a crane (not shown) so that the axis is vertical, and the notch groove 20 of the steel pipe pile main body 102 is fitted to the convex portion 30 of the sheath pipe 103. As described above, since the length in the axial direction of the convex portion 30 is twice the notch depth of the notched grooves 12 and 20, the notched grooves 12 and 20 are formed on the upper and lower sides of the convex portion 30 as shown in the figure. Each is in a mated state. Thereby, the steel pipe pile 102 is positioned with respect to the sheath pipe 103, and there is a slight gap between the side end 20b of the notch groove 20 and the side end 30b of the convex portion 30 for easy fitting. By rotating the steel pipe pile main bodies 101 and 102, the side end 20b and the side end 30b come into contact with each other, and the sheath pipe 103 is fixed with respect to the rotation direction of the steel pipe pile main body 102. A rotational force is transmitted to the sheath tube 103. Since the sheath pipe 103 is fixed with respect to the rotation direction of the steel pipe pile main body 101 as described above, the rotational force of the steel pipe pile main body 102 is transmitted to the steel pipe pile main body 101 via the sheath pipe 103. It becomes. Further, the upper end 20a of the notch groove 20 and the upper end 30c of the convex part 30 abut, the lower end 30a of the convex part 30 and the lower end 12a of the notch groove 12 abut, and the tip of the steel pipe pile main body 102 and the steel pipe pile main body When the base end of 101 comes into contact, the pressure input applied to the steel pipe pile main body 102 is transmitted to the steel pipe pile main body 101. Thus, the steel pipe pile main body 101 and the steel pipe pile main body 102 are fixed with respect to the press-fitting direction and the rotation direction. In the present embodiment, the rotational force and the pressure input are transmitted by the fitting between the notch grooves 12 and 20 and the convex portion 30, but for example, the fitting between the notch grooves 12 and 20 and the convex portion 30 is performed. A slight gap is provided as a margin in the vertical direction, and only the rotational force is transmitted by the fitting, and the pressure input is transmitted only by contact between the distal end of the steel pipe pile main body 102 and the proximal end of the steel pipe pile main body 101. It may be a thing.

  In this state, the insertion holes 13 and 21 of the steel pipe pile main bodies 101 and 102 correspond to the insertion holes 31 of the sheath pipe 103. Bolts (fasteners) 33 are respectively inserted into the corresponding insertion holes 13 and 31 and the insertion holes 21 and 31 through washers 32 and nuts (fasteners) 34 are screwed together. Thereby, the steel pipe pile main body 101 and the steel pipe pile main body 102 are fixed with respect to the drawing direction of the steel pipe pile 100. The diameters of these insertion holes 13, 21, 31 are sufficiently larger than the diameter of the bolt 33. FIG. 5 shows a state in which the bolt 33 is inserted into the insertion hole 13 of the steel pipe pile main body 101 and the insertion hole 31 of the sheath pipe 103. The diameter d1 of the insertion holes 13 and 31 is as shown in FIG. ), It is sufficiently large with respect to the diameter d2 of the bolt 33, and a sufficient margin (d1-d2) is generated even when the bolt 33 is inserted. Therefore, as shown in FIG. 5B, the steel pipe pile main body 101 and the sheath pipe 103 can be rotated relative to each other about the axis within a predetermined range in a state where the bolt 33 is inserted into the insertion holes 13 and 31. ing. Moreover, the washer 32 prevents earth and sand from entering the inner space of the steel pipe pile main body 101 from the marginal dimensions of the insertion holes 13 and 31.

  As described above, since a slight gap is provided between the side end 12b of the notch groove 12 of the steel pipe pile body 101 and the side end 30b of the convex portion 30 of the sheath pipe 103, the steel pipe pile 100 is rotationally press-fitted into the ground. In doing so, the steel pipe pile main body 101 and the sheath pipe 103 rotate relatively until the side end 12b and the side end 30b come into contact with each other. Therefore, if the margin of the insertion holes 13 and 31 is set to be larger than the gap between the side end 12b of the notch groove 12 and the side end 30b of the protrusion 30, the side end 12b of the notch groove 12 and the protrusion The steel pipe pile main body 101 and the sheath pipe 103 can rotate around the axis until the side end 30b of the portion 30 comes into contact with each other, and the steel pipe pile main body 101 and the sheath pipe are fitted by the notch groove 12 and the convex portion 30. The rotational force transmitted to 103 is not applied to the bolt 33, and the bolt 33 is not broken when the steel pipe pile 100 is press-fitted. Although the state in which the bolt 33 is inserted into the insertion hole 21 of the steel pipe pile body 102 and the insertion hole 31 of the sheath pipe 103 is not shown in the drawing, the insertion hole 13 of the steel pipe pile body 101 and the insertion hole of the sheath pipe 103 are not shown. The steel pipe pile main body 102 and the sheath pipe 103 are rotatable about the axis, and the steel pipe pile is fitted by the fitting between the notch groove 20 and the convex portion 30. The rotational force transmitted between the main body 102 and the sheath tube 103 is not applied to the bolt 33 inserted through the insertion holes 21 and 31.

  Thus, after joining the steel pipe pile main body 101 and the steel pipe pile main body 102 via the sheath pipe 103, a construction machine is attached to the base end side of the steel pipe pile main body 102, and the steel pipe pile main body 102 is rotated centering on an axis line. And the fitting between the notch groove 20 of the steel pipe pile main body 102 and the convex part 30 of the sheath pipe 103, the rotational force is transmitted from the steel pipe pile main body 102 to the sheath pipe 103, and the convex part 30 of the sheath pipe 103 By the fitting with the notch groove 12 of the steel pipe pile main body 101, the rotational force is transmitted from the sheath pipe 103 to the steel pipe pile main body 101, and the steel pipe pile main bodies 101 and 102 rotate together. Moreover, the force which press-fits the steel pipe pile main body 102 to the ground is that the said notch grooves 12 and 20 and the convex part 30 fit, and the front-end | tip of the steel pipe pile main body 102 and the base end of the steel pipe pile main body 101 contact | abut. Is transmitted from the steel pipe pile main body 102 to the steel pipe pile main body 101. Thereby, the steel pipe pile main bodies 101 and 102 are press-fitted into the ground while rotating, and are buried in the ground.

  Thus, since welding is not required for the joining of the steel pipe pile main bodies 101 and 102 via the sheath pipe 103, the work at the construction site is easy and the structure is simple, so that the processing cost can be suppressed. There are advantages. Moreover, since the steel pipe pile main bodies 101 and 102 and the sheath pipe | tube 103 are not provided with the screw hole, even if some earth and sand etc. adhere to these members at the time of conveyance, storage, and construction, they will not hinder the joining operation. In addition, since the sheath pipe 103 is joined by inserting it into the steel pipe pile main bodies 101, 102, the axis of the steel pipe pile 100 is not bent at the joined portion, and the compressive force of the building is reliably supported. can do. In addition, when the steel pipe pile main body 101 is first press-fitted with an inclination from the vertical direction, it is not possible to bend the joint portion so that only the steel pipe pile main body 102 is vertical. Since the main body 102 is also press-fitted into the ground in an inclined state, it is necessary to redo the construction of the steel pipe pile main body 101 to correct this. In general, after the steel pipe pile 100 is completely buried, it is difficult to confirm from the ground whether or not the steel pipe pile body 101 on the front end side is buried in the vertical direction. Since the steel pipe pile main bodies 101 and 102 are joined to the coaxial line, if the proximal steel pipe pile main body 102 is embedded in the vertical direction, the distal steel pipe pile main body 101 is also embedded in the vertical direction. Can be guessed.

  In addition, when steel pipe pile main body 101,102 is joined and it reinforces construction after press-fitting to some extent, steel pipe pile main body 102 will be reversely rotated and pulled out, but said insertion holes 13,31 and insertion holes The steel pipe pile main body 101 and the sheath pipe 103, and the sheath pipe 103 and the steel pipe pile main body 102 are fixed with respect to the pulling direction by the bolts 33 inserted respectively in 21 and 31, and the rotation direction is described above. As described above, since the steel pipe pile main body 101 and the sheath pipe 103 are fixed and the sheath pipe 103 and the steel pipe pile main body 102 are fixed, the drawing force by the construction machine is passed from the steel pipe pile main body 102 through the sheath pipe 103. The steel pipe pile main body 101 and the reverse rotational force are transmitted to the steel pipe pile main body 101, and the steel pipe pile main bodies 101, 102 can be reversely rotated together and pulled out.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described.
FIG. 6 is a front view showing the configuration of the steel pipe pile according to the second embodiment of the present invention. As with the steel pipe pile 100 according to the first embodiment, the steel pipe pile 200 is also formed by joining two steel pipe pile main bodies 201 and 202 on the coaxial line via the sheath pipe 203. The structure of the joint ends of the main bodies 201 and 202 and the sheath tube 203 is different from that of the steel pipe pile 100. Hereinafter, the structure of the joining portion will be described in more detail.

  As shown in FIG. 6, the steel pipe pile main body 201 is the same as the steel pipe pile main body 101, and is provided with the spiral blade 10 and the excavation claw 11 at the tip portion thereof. As shown in FIG. 7, a notch groove 14 and an insertion hole 15 are formed at the end. The notch groove 14 and the insertion hole 15 are the same as the notch groove 12 and the insertion hole 13 of the steel pipe pile main body 101, and a pair of the notch grooves 14 are formed so as to be symmetric with respect to the axis of the steel pipe pile main body 201. In addition, an insertion hole 15 is bored in a direction substantially perpendicular to the axis of the steel pipe pile main body 201 at a portion below the notch groove 14 where the sheath pipe 203 is inserted.

  As shown in FIG. 6, the steel pipe pile main body 202 uses a steel pipe having substantially the same diameter and length as the steel pipe pile main body 201, and at the tip thereof, as shown in FIG. Is formed. A pair of the projecting pieces 22 are formed so as to be symmetric with respect to the axis so as to correspond to the notch groove 14 and to have a constant width in the circumferential direction of the steel pipe pile main body 202 or slightly narrow toward the lower side. The width and the notch depth are substantially the same as those of the notch groove 14. Further, an insertion hole 23 is formed in a direction substantially perpendicular to the axis of the steel pipe pile main body 202 at a portion above the convex piece 22 and where the sheath pipe 103 is inserted. In addition, considering that the steel pipe pile body 202 is further joined, a notch groove and an insertion hole similar to the notch groove 14 and the insertion hole 15 of the steel pipe pile body 201 are formed at the proximal end of the steel pipe pile body 202. Has been.

  As shown in FIGS. 6 and 7, the sheath tube 203 is composed of a steel pipe having an outer diameter that is substantially the same as or slightly smaller than the inner diameter of the steel pipe pile main bodies 201 and 202, and the steel pipe pile main bodies 201 and 202 are joined together. In the portion, the steel pipe pile main body 201 and the steel pipe pile main body 202 are respectively inserted. The length of the sheath pipe 203 is long enough to maintain the steel pipe pile main bodies 201 and 202 on the same axis. If it is too long, the construction and handling are inconvenient and the cost is high. Moreover, as shown in the figure, the sheath pipe 203 is provided with insertion holes 35 and 36 in two directions corresponding to the insertion holes 15 and 23 of the steel pipe pile main bodies 201 and 202 in a direction substantially perpendicular to the axis. It is installed.

Next, the joining of the steel pipe pile main bodies 201 and 202 through the sheath pipe 203 will be described.
First, as shown in FIG. 8, the sheath pipe 203 is inserted into the base end side of the steel pipe pile main body 201 that is rotationally press-fitted into the ground while leaving the base end portion by a construction machine, and the insertion hole 15 of the steel pipe pile main body 201 and Bolts 33 are respectively inserted into the lower insertion holes 35 corresponding to the insertion holes 15 through the washers 32 and the nuts 34 are screwed together. Thereby, the sheath pipe | tube 203 is fixed in the state protruded from the base end side of the steel pipe pile main body 201. FIG. Thereafter, as shown in FIG. 9, the steel pipe pile main body 202 is fitted so that the sheath pipe 203 is inserted into the steel pipe pile main body 202. As described above, since the notch groove 14 of the steel pipe pile main body 201 and the convex piece 22 of the steel pipe pile main body 202 are matched, the notch groove 14 and the convex piece 22 are fitted. Thereby, when rotating the steel pipe pile main body 202, the side end 14b of the notch groove 14 and the side end 22b of the convex piece 22 abut, and the steel pipe pile main body 201 is fixed to the rotation direction of the steel pipe pile main body 202. Then, the rotational force of the steel pipe pile main body 202 is transmitted to the steel pipe pile main body 201. Moreover, while the lower end 14a of the notch groove 14 and the lower end 22a of the convex piece 22 contact | abut, the front-end | tip of the steel pipe pile main body 202 and the base end of the steel pipe pile main body 201 contact | abut, thereby, it provides to the steel pipe pile main body 202. The pressure input is transmitted to the steel pipe pile main body 201. Thus, the steel pipe pile main body 201 and the steel pipe pile main body 202 are fixed with respect to the press-fitting direction and the rotation direction. In this embodiment, the rotational force and the pressure input are transmitted by fitting the notch groove 14 and the convex piece 22, but, for example, also in the vertical direction of the fitting of the notch groove 14 and the convex piece 22. A slight gap may be provided as a margin dimension, and only the rotational force is transmitted by the fitting, and the pressure input may be transmitted only by contact between the distal end of the steel pipe pile main body 202 and the proximal end of the steel pipe pile main body 201. .

  In this state, the insertion hole 23 of the steel pipe pile main body 202 and the insertion hole 36 on the upper side of the sheath pipe 203 correspond to each other. Bolts 33 are also inserted into these insertion holes 23 and 36 through washers 32, and nuts 34 are screwed together. Thereby, the steel pipe pile main body 202 and the sheath pipe 203 are fixed, and the steel pipe pile main body 201 and the steel pipe pile main body 202 are fixed to the drawing direction of the steel pipe pile 200 via the sheath pipe 203. Since the diameters of the insertion holes 15, 23, 35, and 36 through which the bolts 33 are inserted are sufficiently larger than the diameter of the bolts 33 as in the first embodiment, the notch grooves 14 The steel pipe pile main body 201 and the steel pipe pile main body 202 are mutually rotatable about the axis until the side end 14b of the convex piece 22 abuts on the side end 22b of the convex piece 22, and the steel pipe pile main body 201 and the steel pipe pile main body 202 are The rotational force transmitted between the bolts 33 is not applied to the bolts 33, and the bolts 33 are not broken when the steel pipe pile 200 is press-fitted. On the other hand, since the steel pipe pile main body 201 and the steel pipe pile main body 202 are fixed with respect to the drawing direction by the bolt 33, the drawing force by the construction machine is transmitted from the steel pipe pile main body 202 to the steel pipe pile main body 201.

  Thus, after joining the steel pipe pile main body 201 and the steel pipe pile main body 202 via the sheath pipe 203, a construction machine is attached to the base end side of the steel pipe pile main body 202, and the steel pipe pile main body 202 is rotated centering on an axis. By fitting the convex piece 22 of the steel pipe pile main body 202 and the notch groove 14 of the steel pipe pile main body 201, the rotational force is transmitted from the steel pipe pile main body 102 to the steel pipe pile main body 201. Rotate together. The force for press-fitting the steel pipe pile main body 202 into the ground is such that the notch groove 14 and the convex piece 23 are fitted, and the tip of the steel pipe pile main body 202 and the base end of the steel pipe pile main body 201 are in contact with each other. It is transmitted from the steel pipe pile main body 202 to the steel pipe pile main body 201. Thereby, the steel pipe pile main bodies 201 and 202 are press-fitted into the ground while rotating and buried in the ground.

  Thus, since welding is not required for the joining of the steel pipe pile main bodies 201 and 202 via the sheath pipe 203, the work at the construction site is easy and the structure is simple as in the first embodiment. Therefore, there is an advantage that the processing cost can be suppressed. Even if some soil or the like adheres to the steel pipe pile main bodies 201 and 202 and the sheath pipe 203, it does not hinder the joining operation. In addition, since the sheath pipe 203 is joined by inserting it into the steel pipe pile main bodies 201 and 202, the axis of the steel pipe pile 300 is not bent at the joined portion, and the compressive force of the building is reliably supported. Furthermore, it can be estimated from the ground whether or not the steel pipe pile body 201 on the tip side is embedded in the vertical direction.

  In the present embodiment, the sheath pipe 203 is inserted into the steel pipe pile main body 201 and fixed with the bolts 33 and the like, and then the steel pipe pile main body 202 is fitted. However, the procedure of the joining work is limited to this. For example, the sheath pipe 203 is inserted in advance on the tip side of the steel pipe pile main body 202 and fixed with a bolt 33 or the like, and the steel pipe pile main body 202 and the sheath pipe 203 are fitted to the steel pipe pile main body 201. It is also possible to make it.

[Third Embodiment]
Hereinafter, a third embodiment of the present invention will be described.
FIG. 10: is a front view which shows the structure of the steel pipe pile which concerns on the 3rd Embodiment of this invention. As with the steel pipe pile 100 according to the first embodiment, the steel pipe pile 300 is also formed by joining two steel pipe pile main bodies 301 and 302 onto a coaxial line via a sheath pipe 303. The structure of the joint ends of the main bodies 301 and 302 and the sheath pipe 303 is different from that of the steel pipe pile 100. Hereinafter, the structure of the joining portion will be described in more detail.

  As shown in FIG. 10, the steel pipe pile main body 301 uses a steel pipe having the same diameter and length as a conventional steel pipe pile, and the tip portion thereof has a spiral blade 10 like the steel pipe pile main body 101. And the excavation claw 11 is provided. On the other hand, as shown in FIG. 11, a square tube 16 is provided at the proximal end of the steel pipe pile main body 301, and the outer periphery of the joint end is rectangular in a sectional view. The square pipe 16 has a rectangular cross section with a size in which the steel pipe pile main body 101 is inscribed in the inner space, and the lower end thereof is fixed by welding with the base end of the steel pipe pile main body 101 being flush. Further, an insertion hole 17 is bored through the square pipe 16 and the steel pipe pile main body 301 in a direction substantially orthogonal to the axis of the steel pipe pile main body 301.

  As shown in FIG. 10, the steel pipe pile main body 302 uses a steel pipe having substantially the same diameter and length as the steel pipe pile main body 301, and at its tip, as shown in FIG. And the outer periphery of the joint end is rectangular in a sectional view. The square tube 24 has the same shape as the square tube 16 and is fixed by welding with its upper end flush with the tip of the steel pipe pile main body 302. Further, an insertion hole 25 is bored through the square tube 24 and the steel pipe pile main body 302 in a direction substantially orthogonal to the axis of the steel pipe pile main body 302. In addition, in consideration of joining the steel pipe pile main body 302 to the base end of the steel pipe pile main body 302, the square tube 24 is provided and the insertion hole 25 is formed. In addition, by providing the square tube 24 and the insertion hole 25 at both the distal end and the proximal end of the steel pipe pile main body 302, the steel pipe pile main body 302 has no vertical direction and the construction becomes easy.

  As shown in FIGS. 10 and 11, the sheath tube 303 is a rectangular square tube whose inner peripheral cross-sectional shape matches the outer shape of the square tubes 16, 24, and is a joint portion of the steel pipe pile main bodies 301, 302. Are externally fitted to the square tubes 16 and 24, respectively. The length of the sheath pipe 303 is such a length that the steel pipe pile main bodies 301 and 302 can be maintained on the same axis. If it is too long, the construction and handling are inconvenient and the cost is increased. Moreover, as shown in the figure, the sheath pipe 303 is provided with insertion holes 37 and 38 in two directions, corresponding to the insertion holes 17 and 25 of the steel pipe pile main bodies 301 and 302, in a direction substantially perpendicular to the axis. It is installed.

Next, the joining of the steel pipe pile main bodies 301 and 302 through the sheath pipe 303 will be described.
First, as shown in FIG. 12, the surface and sheath in which the insertion hole 17 of the square tube 16 is drilled on the proximal end side of the steel pipe pile main body 301 that is rotationally press-fitted into the ground while leaving the proximal end portion by a construction machine. The sheath tube 303 is externally fitted together with the surface of the tube 303 in which the insertion hole 37 is formed, the bolt 33 is inserted into the insertion holes 17 and 37, and the nut 34 is screwed. Thereby, the sheath pipe | tube 303 is fixed in the state protruded from the base end side of the steel pipe pile main body 301. FIG. Moreover, since the external shape of the square tube 16 of the steel pipe pile main body 301 and the inner shape of the sheath pipe 303 are in agreement, the sheath pipe 303 is fitted to the steel pipe pile main body by fitting so that the rectangular corners of each other mesh. The rotational force of the sheath pipe 303 is fixed to the rotational direction of the 301, and the rotational force of the sheath pipe 303 is transmitted to the steel pipe pile main body 301.

  Thereafter, as shown in FIG. 13, the surface of the tubular tube 303 is combined with the surface of the square tube 24 in which the insertion hole 25 is formed and the surface of the sheath tube 303 in which the insertion hole 38 is formed. The tip of 302 is fitted so as to be inserted into the sheath tube 303. Since the outer shape of the square tube 24 of the steel pipe pile main body 302 and the inner shape of the sheath tube 303 are coincident with each other, the sheath tube 303 is fitted by fitting so that the rectangular corners are engaged with each other as described above. The steel pipe pile main body 302 is fixed in the rotational direction, and the rotational force of the steel pipe pile main body 302 is transmitted to the sheath pipe 303. Moreover, in the sheath pipe 303, the front-end | tip of the steel pipe pile main body 302 and the base end of the steel pipe pile main body 301 contact | abut, and the pressure input provided to the steel pipe pile main body 302 is transmitted to the steel pipe pile main body 301. Thus, the steel pipe pile main body 301 and the steel pipe pile main body 302 are fixed with respect to the press-fitting direction and the rotation direction.

  In this state, the insertion hole 25 of the steel pipe pile main body 302 and the insertion hole 38 on the upper side of the sheath pipe 303 correspond to each other. Bolts 33 are respectively inserted into the insertion holes 25 and 38 and nuts 34 are screwed together. Thereby, the steel pipe pile main body 302 and the sheath pipe 303 are fixed, and the steel pipe pile main body 301 and the steel pipe pile main body 302 are fixed with respect to the drawing direction of the steel pipe pile 300 via the sheath pipe 303. The drawing force is transmitted from the steel pipe pile main body 202 to the steel pipe pile main body 201. In this embodiment, since the steel pipe pile main bodies 301 and 302 do not rotate with respect to the sheath pipe 302, the diameters of the insertion holes 17, 25, 37, and 38 are set to the bolts 33 as in the first embodiment. Although it is not necessary to make it sufficiently large with respect to the diameter, when a slight gap is provided between the square tubes 16 and 24 and the sheath tube 303 in order to facilitate the fitting operation, it corresponds to the gap. Thus, the diameters of the insertion holes 17, 25, 37, and 38 are also provided with a margin with respect to the diameter of the bolt 33 so that the rotational force transmitted between the steel pipe pile main body 301 and the steel pipe pile main body 302 is not loaded on the bolt 33. It is preferable to do. Further, when a margin is provided for the diameters of the insertion holes 17, 25, 37, and 38, a washer 32 is disposed in each insertion hole 17, 25, 37, and 38 in the same manner as in the above embodiment. It is preferable to prevent the earth and sand from entering the inner space of the steel pipe pile main bodies 301 and 302 from the dimension location.

  Thus, after joining the steel pipe pile main body 301 and the steel pipe pile main body 302 via the sheath pipe 303, a construction machine is attached to the base end side of the steel pipe pile main body 302, and the steel pipe pile main body 302 is rotated around an axis line. Then, by the fitting of the square tube 24 of the steel pipe pile main body 302 and the sheath pipe 303, the rotational force is transmitted from the steel pipe pile main body 302 to the sheath pipe 303, and the square pipe 16 of the sheath pipe 303 and the steel pipe pile main body 301 is further transmitted. By the fitting, the rotational force is transmitted from the sheath pipe 303 to the steel pipe pile main body 301, and the steel pipe pile main bodies 301 and 302 rotate together. Moreover, the force which press-fits the steel pipe pile main body 302 to the ground is transmitted to the steel pipe pile main body 301 from the steel pipe pile main body 302 when the front-end | tip of the steel pipe pile main body 302 and the base end of the steel pipe pile main body 301 contact | abut. Thereby, the steel pipe pile main bodies 301 and 302 are press-fitted into the ground while rotating and buried in the ground. On the other hand, when the steel pipe pile 300 is pulled out, the steel pipe pile main body 301 and the steel pipe pile main body 302 are fixed in the pulling direction by the bolt 33 through the sheath pipe 303, so that the steel pipe pile main bodies 301 and 302 by the construction machine rotate. It can be pulled out from the ground.

  Thus, since welding is not required for the joining of the steel pipe pile main bodies 301 and 302 via the sheath pipe 303, the work at the construction site is easy and the structure is simple as in the first embodiment. Therefore, there is an advantage that the processing cost can be suppressed. Even if some earth and sand or the like adheres to the steel pipe pile main bodies 301 and 302 and the sheath pipe 303, it does not hinder the joining operation. In addition, since the sheath pipe 303 is joined by being externally fitted to the steel pipe pile main bodies 301 and 302, the axis of the steel pipe pile 300 is not bent at the joint portion, and the compressive force of the building is reliably supported. Furthermore, it can be estimated from the ground whether or not the steel pipe pile body 301 on the tip side is embedded in the vertical direction.

  In this embodiment, the sheath pipe 303 is externally fitted to the steel pipe pile main body 301 and fixed with the bolts 33 and the like, and then the steel pipe pile main body 302 is fitted. However, the procedure of the joining operation is limited to this. For example, a sheath pipe 303 is externally fitted to the distal end side of the steel pipe pile main body 302 in advance and fixed with a bolt 33 or the like, and the steel pipe pile main body 302 and the sheath pipe 303 are attached to the steel pipe pile main body 301. It is good also as fitting. Moreover, in this embodiment, the outer peripheral shape of the joint end of the steel pipe pile main bodies 301 and 302 is rectangular in a sectional view by the square tubes 16 and 24, and the inner peripheral shape of the sheath pipe 303 is also rectangular. The cross-sectional shape of the outer periphery of the joint ends of the main bodies 301 and 302 and the inner periphery of the sheath tube 303 is not limited to a rectangle, but may be other polygonal shapes.

It is a front view which shows the structure of the steel pipe pile 100 which concerns on the 1st Embodiment of this invention. 1 is an exploded perspective view showing a joint structure of a steel pipe pile 100. FIG. It is an enlarged front view which shows the fitting state of the steel pipe pile main body 101 and the sheath pipe 103. FIG. It is an enlarged front view which shows the fitting state of the steel pipe pile main body 102 and the sheath pipe 103. FIG. It is sectional drawing which shows the state in which the volt | bolt 33 was penetrated by the penetration hole 13 of the steel pipe pile main body 101, and the penetration hole 31 of the sheath pipe 103. FIG. It is a front view which shows the structure of the steel pipe pile 200 which concerns on the 2nd Embodiment of this invention. It is a disassembled perspective view which shows the joint structure of the steel pipe pile 200. FIG. It is an enlarged front view which shows the fitting state of the steel pipe pile main body 201 and the sheath pipe 203. FIG. It is an enlarged front view which shows the fitting state of the steel pipe pile main body 202 and the sheath pipe 203. FIG. It is a front view which shows the structure of the steel pipe pile 300 which concerns on the 3rd Embodiment of this invention. It is a disassembled perspective view which shows the joint structure of the steel pipe pile 300. FIG. It is an enlarged front view which shows the fitting state of the steel pipe pile main body 301 and the sheath pipe 303. FIG. It is an enlarged front view which shows the fitting state of the steel pipe pile main body 302 and the sheath pipe 303. FIG. It is the schematic which shows the structure of the conventional steel pipe pile 90. FIG. It is an enlarged front view which shows the joining part of the steel pipe pile main body 91 and the steel pipe pile main body 93. FIG.

Explanation of symbols

12, 14, 20 Notch groove 13, 15, 17, 21, 23, 25, 31, 35, 36, 37, 38 Insertion hole 22 Convex piece 30 Convex part 33 Bolt (fastener)
100, 200, 300 Steel pipe pile 101, 102, 201, 202, 301, 302 Steel pipe pile body 103, 203, 303 Sheath pipe

Claims (5)

  A steel pipe pile joint structure in which a sheath pipe is inserted into a joint end of a steel pipe pile body, and the steel pipe pile body is joined on a coaxial line, and each steel pipe pile body has a notch groove in the axial direction at the joint end. Are formed, and insertion holes are respectively drilled in a direction substantially perpendicular to the axis of the steel pipe pile main body in a portion where the sheath pipe is inserted, and the sheath pipe is formed in the cutout grooves on the outer periphery. Are provided with projections to be fitted, and insertion holes are respectively drilled at positions corresponding to the respective insertion holes, and the sheath pipe is connected to each steel pipe pile body to which the projections are to be joined. A steel pipe pile joint structure, wherein the steel pipe pile joint structure is characterized in that it is fitted with a notch groove and inserted into each joint end, and a fastener is inserted into the insertion hole of each steel pipe pile body and the insertion hole of the sheath pipe.   The diameter of each insertion hole of each said steel pipe pile main body and said sheath pipe is set as the magnitude | size in which each said steel pipe pile main body of the said fastener is inserted and it can rotate in the predetermined range mutually centering on an axis line. The steel pipe pile body is inserted into the hole and fixed to the drawing direction in a state where the steel pipe pile main bodies are mutually rotatable around the axis, and the steel pipe pile main body and the sheath pipe are fitted by fitting the notch groove and the convex portion. The joint structure of a steel pipe pile according to claim 1, wherein a rotational force of the steel pipe pile transmitted between the two is not applied to the fastener.   A steel pipe pile joint structure in which a sheath pipe is inserted into the joint end of the steel pipe pile body, and the steel pipe pile body is joined on the coaxial line, and the one steel pipe pile body has a notch groove in the axial direction at the joint end. Is formed, and an insertion hole is drilled in a direction substantially perpendicular to the axis of the steel pipe pile main body in the portion where the sheath pipe is inserted, and the other steel pipe pile main body is axially connected to the joining end. A convex piece that fits into the notch groove of the one steel pipe pile main body is provided, and an insertion hole is drilled in a direction substantially orthogonal to the axis of the steel pipe pile main body at a portion where the sheath pipe is inserted. The sheath pipe is formed with an insertion hole at a position corresponding to each insertion hole, and the joint end of one steel pipe pile main body has a notch groove and a convexity of another steel pipe pile main body. The steel pipe pile main body is in contact with the joint end of the other steel pipe pile main body so that the pieces are fitted, and the sheath pipe is inserted into each joint end. Joint structure of the steel pipe pile, characterized in that the insertion hole and fastener insertion hole of the sheath tube is inserted.   The diameter of each insertion hole of each said steel pipe pile main body and said sheath pipe is set as the magnitude | size in which each said steel pipe pile main body of the said fastener is inserted and it can rotate in the predetermined range mutually centering on an axis line. The steel pipe pile main body is fixed to the pulling direction in a state where the steel pipe pile main bodies are rotatable with respect to each other about the axis, and is transmitted between the steel pipe pile main bodies by fitting the notched grooves and convex pieces. 4. The steel pipe pile joint structure according to claim 3, wherein a rotational force of the steel pipe pile to be applied is not loaded on the fastener.   A steel pipe pile joint structure in which a sheath pipe is externally fitted to a joint end of a steel pipe pile body, and the steel pipe pile body is joined on a coaxial line, and each steel pipe pile body has a polygonal outer periphery at the joint end In addition, insertion holes are respectively drilled in the direction in which the sheath pipe is externally fitted in a direction substantially orthogonal to the axis of the steel pipe pile body, and the inner circumference of the sheath pipe is the steel pipe pile. It is formed in a polygonal shape corresponding to the joining end of the main body, and the insertion holes are respectively drilled at positions corresponding to the respective insertion holes, and the sheath pipes are joined ends of the steel pipe pile main bodies. And a steel pipe pile joint structure characterized by being fitted to each joint end and fitted to each joint end, and a fastener inserted through the insertion hole of each steel pipe pile body and the insertion hole of the sheath pipe.

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