JP6405631B2 - Steel pipe pile rotation deterrent structure - Google Patents

Description

  The present invention relates to a rotation inhibition structure for a steel pipe pile that inhibits relative rotation between a first steel pipe pile and a second steel pipe pile.

  Conventionally, steel pipe piles are often set in the ground while rotating, and the direction of rotation may be changed. The steel pipe pile rotation inhibition structure disclosed in Patent Document 1 is intended to suitably prevent the joint from loosening or coming off when the steel pipe pile is reversed.

  In the steel pipe pile rotation inhibiting structure disclosed in Patent Document 1, when the female cylinder and the male cylinder are coupled, the tapered surface of the inner protrusion and the tapered surface of the outer protrusion are firmly coupled to the upper and lower cylinders. The key groove forming portion of the male cylinder and the key groove forming portion of the female cylinder coincide with the axial direction.

  In the steel pipe pile rotation restraining structure disclosed in Patent Document 1, a tap hole is formed in the key groove part forming part of the male cylinder, and a bolt hole part is provided in the key member, so that the key groove part forming part of the male cylinder is formed. The key member is fitted from the outer surface of the cylinder in a state where the key groove portion forming portion of the female cylinder coincides with the axial direction.

JP 2004-92291 A

  However, the steel pipe pile rotation restraining structure disclosed in Patent Document 1 is such that the key member is fitted into a key groove portion forming portion formed by cutting out the outer surface projection of the female cylinder, so that the axial resistance and rotational resistance are reduced. The external projection bears the force. For this reason, the steel pipe pile rotation restraint structure disclosed in Patent Document 1 cannot easily perform the structural calculation of the outer surface protrusion with respect to the axial resistance force and the rotation resistance force, and thus improves the design accuracy of the entire joint. There was a problem that it was difficult to do.

  Moreover, since the rotation prevention structure of the steel pipe pile disclosed by patent document 1 cuts off the outer surface protrusion of a female cylinder, and forms a keyway part formation part, the outer surface which resists the tensile force and compressive force of an axial direction A cross-sectional defect is caused in the protrusion. For this reason, the rotation restraining structure of the steel pipe pile disclosed in Patent Document 1 has a sufficient amount of axial resistance between the male cylinder and the female cylinder because a cross-sectional defect occurs in the outer surface projection that bears tensile strength and compression strength. There was a problem that there was a possibility that it could not be secured.

  Furthermore, the steel pipe pile rotation restraint structure disclosed in Patent Document 1 has a key groove from the male cylinder to the female cylinder in a state where the key groove portion forming portion of the male cylinder and the key groove portion forming portion of the female cylinder coincide with each other in the axial direction. The key member is fitted into the groove forming portion and installed. For this reason, the rotation suppression structure of the steel pipe pile disclosed in Patent Document 1 causes the key member to rotate and move in the in-plane direction when the male cylinder and the female cylinder try to rotate relative to each other in the circumferential direction. Therefore, there is a problem that the rotational resistance force between the male cylinder and the female cylinder may not be sufficiently improved.

  Here, since the rotation suppression structure of the steel pipe pile disclosed in Patent Document 1 bears the rotational resistance force between the key member and the outer surface protrusion, when the material strength of the key member is lower than the outer surface protrusion, the key member is Since it is destroyed, the rotational resistance force is determined by the key member. For this reason, the rotation suppression structure for steel pipe piles disclosed in Patent Document 1 requires the key member to have the same strength as the outer surface protrusion in order to improve the rotation resistance force, so the key member becomes expensive. There was a problem. In addition, the steel pipe pile rotation restraint structure disclosed in Patent Document 1 increases the dimension of the key member and increases the cross-sectional defect when the rotational force is improved without increasing the material strength of the key member. There was a problem.

  Therefore, the present invention has been devised in view of the above-described problems, and the object of the present invention is to improve the rotational resistance force between the outer fitting end portion and the inner fitting end portion, and thereby the first steel pipe. It is providing the rotation suppression structure of the steel pipe pile which can ensure reliably the connection state of a pile and a 2nd steel pipe pile.

The steel pipe pile rotation restraining structure according to the first invention is a steel pipe pile rotation restraining structure that inhibits relative rotation between the first steel pipe pile and the second steel pipe pile, and the first steel pipe pile and the second steel pipe pile in the axial direction. An outer fitting end portion and an inner fitting end portion for connecting a steel pipe pile, the outer fitting end portion projecting inward in the axial center orthogonal direction, and the outer fitting mountain portion An outer fitting groove formed adjacent to each other in the circumferential direction, an outer fitting valley formed on the base end side in the axial direction from the outer fitting mountain portion, and an outer fitting tip provided on the distal end side in the axial direction And an external fitting base end portion provided on the base end side in the axial direction, the internal fitting end portion projecting outward in the axial center orthogonal direction, Provided on the inner fitting groove portion formed adjacent to the inner fitting mountain portion in the circumferential direction, the inner fitting valley portion formed on the proximal side in the axial direction from the inner fitting mountain portion, and the distal end side in the axial direction Internal fitting point And an inner fitting proximal end provided on the proximal end side in the axial direction, and either or both of the outer fitting distal end and the inner fitting distal end protruded in the axial direction. A part is formed, and either one or both of the outer fitting base end part and the inner fitting base end part is formed with a groove part cut out in the axial direction, and the protruding part is formed in the axial direction. The outer fitting end portion and the inner fitting end portion are rotated relative to each other in the circumferential direction while being inserted into the groove portion, so that the groove portion is locked to the groove portion in the circumferential direction. and provided by independent from the inner Hamayama portion, circumferential width of said groove, said is larger than the circumferential width of the protrusion, characterized in Rukoto.

  In the steel pipe pile rotation restraining structure according to the second aspect of the present invention, in the first aspect of the present invention, either one or both of the outer fitting front end portion and the inner fitting front end portion has a width in the circumferential direction of the protrusion. The protrusion is formed so as to be smaller than the circumferential width of the groove or the internal fitting groove.

  According to a third aspect of the present invention, there is provided the steel pipe pile rotation restraining structure according to the first aspect, wherein either one or both of the outer fitting front end and the inner fitting front end has a circumferential width of the protrusion. The protrusion is formed to be larger than the circumferential width of the groove or the internal fitting groove.

  According to a fourth aspect of the present invention, there is provided the steel pipe pile rotation restraining structure according to the first aspect, wherein either one or both of the outer fitting front end and the inner fitting front end has a circumferential width of the protrusion. The protrusion is formed so as to be substantially the same as the circumferential width of the groove or the internal fitting groove.

  According to a fifth aspect of the present invention, there is provided the steel pipe pile rotation restraining structure according to any one of the first to fourth aspects, wherein the protrusion and the groove are relative to each other in the circumferential direction between the outer fitting end and the inner fitting end. The contact surfaces that are in contact with each other in a state of being rotated and locked to each other are formed in a tapered shape that is inclined in the circumferential direction.

  In the steel pipe pile rotation restraining structure according to a sixth aspect of the present invention, in any one of the first to fifth aspects of the present invention, the protrusion and the groove are relative to each other in the circumferential direction between the outer fitting end and the inner fitting end. The key member is fitted into a gap formed so as to be separated from each other while being rotated and locked to each other.

  According to 1st invention-6th invention, since a projection part and a groove part are formed independently of an external fitting mountain part and an internal fitting mountain part, axial core resistance force is given to an external fitting mountain part and an internal fitting mountain part. It is possible to easily carry out the structural calculation for bearing the rotation resistance force on the protrusion and groove part independently, so that the accuracy of the design of the entire joint is improved, and the first steel pipe pile It is possible to ensure a reliable connection state between the steel pipe pile and the second steel pipe pile.

  According to the first to sixth inventions, the protrusion or the key member is purely compressed in the circumferential direction without applying an external force in the axial direction to the protrusion or the key member, so that the protrusion or the key member is in-plane. Because it can prevent rotational deformation in the direction, it is possible to improve the rotational resistance between the outer fitting end and the inner fitting end by fully utilizing the material strength of the protrusion or key member It becomes.

  According to the first to sixth inventions, it is possible to adjust the rotational resistance force according to the direction in which the rotational force is applied by changing the strength of the key member and the strength of the protrusion. For example, the rotational force applied at the time of driving the pile body of the rotary pile varies depending on the rotational direction, and the rotational resistance force can be easily adjusted by changing the strength of the key material. Further, according to the first to sixth inventions, the material strength of the key member can be made lower than that of the protruding portion, so that the key member can be manufactured at low cost.

  According to 1st invention-6th invention, since a projection part and a groove part are formed independently of an external fitting mountain part and an internal fitting mountain part, the external fitting mountain part and internal fitting mountain which bear axial resistance force Since it does not cause a cross-sectional defect or the like in the portion, the tensile strength of the outer fitting mountain portion and the inner fitting mountain portion when compared with the case where the protrusion portion or the groove portion is formed in the outer fitting mountain portion or the inner fitting mountain portion. In addition, the compression resistance can be improved, and the axial resistance can be sufficiently secured.

  In particular, according to the fifth aspect of the present invention, the groove side surface is formed in a tapered shape, so that the locking portion formed without being cut out is provided, and the adjacent groove portions are continuously formed in the circumferential direction. Therefore, by engaging a large number of protrusions with a large number of grooves, and by inserting a large number of key members into a large number of gaps, the rotational resistance force between the outer fitting end and the inner fitting end can be reduced. It is possible to significantly improve.

  In particular, according to the sixth aspect of the present invention, it is not necessary to temporarily fix the key member inside the outer fitting end portion or the inner fitting end portion from the outside of the outer fitting distal end portion and the inner fitting proximal end portion. Since the key member is installed in the gap, the relative rotation between the first steel pipe pile and the second steel pipe pile is suppressed without performing complicated processing on the outer fitting end and the inner fitting end. It is possible to easily introduce a structure for doing so.

It is a perspective view which shows the rotation suppression structure of the steel pipe pile to which this invention is applied. It is a front view which shows the external fitting end part of the rotation suppression structure of the steel pipe pile to which this invention is applied. It is an expanded side view which shows the external fitting mountain part and external fitting trough part in the external fitting end part of the rotation suppression structure of the steel pipe pile to which this invention is applied. It is a front view which shows the internal fitting end part of the rotation suppression structure of the steel pipe pile to which this invention is applied. It is an expanded side view which shows the internal fitting mountain part and internal fitting trough part in the internal fitting end part of the rotation suppression structure of the steel pipe pile to which this invention is applied. It is a perspective view which shows the state which inserts an internal fitting end part in the external fitting end part of the rotation suppression structure of the steel pipe pile to which this invention is applied. It is a perspective view which shows the state which inserted the internal fitting end part in the external fitting end part of the rotation suppression structure of the steel pipe pile to which this invention is applied, and made it rotate relatively. It is an expanded side view which shows the tensile force and compression force which act on an external fitting end part and an internal fitting end part in the site | part in which the projection part and groove part of the rotation suppression structure of the steel pipe pile to which this invention is applied are not formed. It is a perspective view which shows 1st Embodiment of the rotation suppression structure of the steel pipe pile to which this invention is applied. It is a perspective view which shows the 1st modification of the external fitting front-end | tip part and internal fitting base end part in 1st Embodiment of the rotation suppression structure of the steel pipe pile to which this invention is applied. It is a perspective view which shows the 2nd modification of the external fitting front-end | tip part and internal fitting base end part in 1st Embodiment of the rotation suppression structure of the steel pipe pile to which this invention is applied. (A) is an expanded side view which shows the external fitting front-end | tip part and internal fitting base end part in 1st Embodiment of the rotation suppression structure of the steel pipe pile to which this invention is applied, (b) is the external fitting front-end | tip part. And it is an enlarged side view which shows the 1st modification of an internal fitting base end part, (c) is an enlarged side view which shows the 2nd modification. (A) is an enlarged front view which shows the protrusion part and groove part of 1st Embodiment of the rotation suppression structure of the steel pipe pile which applied this invention, (b) shows the state by which the protrusion part was inserted in the groove part. It is an enlarged front view, (c) is an enlarged front view showing a state in which the protrusion is locked to the groove. It is a perspective view which shows the state by which a key member is engage | inserted in the space | gap part of the rotation suppression structure of the steel pipe pile to which this invention is applied. It is a perspective view which shows the 1st modification of the projection part and groove part in 1st Embodiment of the rotation suppression structure of the steel pipe pile to which this invention is applied. (A) is an enlarged front view which shows the 1st modification of the protrusion part and groove part of 1st Embodiment of the rotation suppression structure of the steel pipe pile which applied this invention, (b) is a protrusion part inserted in a groove part. It is an enlarged front view which shows the state performed, (c) is an enlarged front view which shows the state by which the projection part was latched by the groove part. It is a perspective view which shows the 2nd modification of the projection part and groove part in 1st Embodiment of the rotation suppression structure of the steel pipe pile to which this invention is applied. (A) is an enlarged front view which shows the 2nd modification of the projection part and groove part of 1st Embodiment of the rotation suppression structure of the steel pipe pile which applied this invention, (b) is a protrusion part inserted in a groove part It is an enlarged front view which shows the state performed, (c) is an enlarged front view which shows the state by which the projection part was latched by the groove part. It is a perspective view which shows the 3rd modification of the projection part and groove part in 1st Embodiment of the rotation suppression structure of the steel pipe pile to which this invention is applied. (A) is an enlarged front view which shows the 3rd modification of the projection part and groove part of 1st Embodiment of the rotation suppression structure of the steel pipe pile which applied this invention, (b) is a protrusion part inserted in a groove part. It is an enlarged front view which shows the state performed, (c) is an enlarged front view which shows the state by which the projection part was latched by the groove part. It is a perspective view which shows 2nd Embodiment of the rotation suppression structure of the steel pipe pile to which this invention is applied. It is a perspective view which shows the 1st modification of the internal fitting front-end | tip part and external fitting base end part in 2nd Embodiment of the rotation suppression structure of the steel pipe pile to which this invention is applied. It is a perspective view which shows the 2nd modification of the internal fitting front-end | tip part and external fitting base end part in 2nd Embodiment of the rotation suppression structure of the steel pipe pile to which this invention is applied. (A) is an expanded side view which shows the inner fitting front-end | tip part and outer fitting base end part in 2nd Embodiment of the rotation suppression structure of the steel pipe pile which applied this invention, (b) is the inner fitting front-end | tip part. It is an enlarged side view which shows the 1st modification of an external fitting base end part, (c) is an enlarged side view which shows the 2nd modification. (A) is an enlarged front view which shows the protrusion part and groove part of 2nd Embodiment of the rotation suppression structure of the steel pipe pile which applied this invention, (b) shows the state by which the protrusion part was inserted in the groove part. It is an enlarged front view, (c) is an enlarged front view showing a state in which the protrusion is locked to the groove. (A) is an enlarged front view which shows the rotational force which acts on the projection part of the rotation suppression structure of the steel pipe pile to which this invention is applied in the circumferential direction, (b) is the rotation which acts on the key member in the circumferential direction. It is an enlarged front view showing force.

  EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the rotation suppression structure 7 of the steel pipe pile to which this invention is applied is demonstrated in detail, referring drawings.

  The steel pipe pile rotation restraint structure 7 to which the present invention is applied is applied to a joint such as a foundation pile of a structure constructed on the ground. As shown in FIG. The relative rotation of the 1 steel pipe pile 1 and the 2nd steel pipe pile 2 of the circumferential direction W is suppressed.

  The steel pipe pile rotation restraining structure 7 to which the present invention is applied includes a pair of external fitting end portions 3 and an internal fitting end portion 5 that connect the first steel pipe pile 1 and the second steel pipe pile 2 in the axial direction Y. . In the steel pipe pile rotation restraint structure 7 to which the present invention is applied, the outer fitting end 3 is attached to the upper end portion of the first steel pipe pile 1 by welding or the like, and the inner fitting end portion 5 is attached to the lower end portion of the second steel pipe pile 2. Is attached by welding or the like.

  The outer fitting end portion 3 is formed with a plurality of outer fitting mountain portions 31 formed to protrude inward in the axial center orthogonal direction X, and a plurality of outer fitting mountain portions 31 formed adjacent to each other in the circumferential direction W. It has the external fitting groove part 32 and the external fitting trough part 33 formed in the base end side of the external fitting end part 3 in the axial direction Y from the external fitting mountain part 31. The outer fitting end portion 3 includes an outer fitting distal end portion 34 provided on the distal end side in the axial direction Y and an outer fitting proximal end portion 35 provided on the proximal end side in the axial direction Y.

  The inner fitting end portion 5 has a plurality of inner fitting mountain portions 51 formed to protrude outward in the axial center orthogonal direction X, and a plurality of inner fitting mountain portions 51 formed adjacent to each other in the circumferential direction W. The inner fitting groove portion 52 and the inner fitting valley portion 53 formed on the proximal end side of the inner fitting end portion 5 in the axial direction Y from the inner fitting mountain portion 51 are provided. The inner fitting end portion 5 has an inner fitting distal end portion 54 provided on the distal end side in the axial direction Y and an inner fitting proximal end portion 55 provided on the proximal end side in the axial direction Y.

  As shown in FIG. 2, the external fitting end portion 3 is provided with an external fitting mountain portion 31 forming a plurality of external fitting step portions 4 in the axial direction Y of the external fitting end portion 3. The external fitting step portion 4 is formed, for example, so that the number of steps is four in the axial direction Y of the external fitting end portion 3, and is based on the axial direction Y of the external fitting end portion 3 from the front end side. It has the 1st external fitting step part 41, the 2nd external fitting step part 42, the 3rd external fitting step part 43, and the 4th external fitting step part 44 in order to the end side.

  The outer fitting end portion 3 has a thickness of the outer fitting groove portion 32 smaller than that of the outer fitting mountain portion 31 at each outer fitting step portion 4 so that the outer fitting mountain portion 31 and the outer fitting groove portion 32 are surrounded by each other. They are alternately formed in the direction W, and the outer fitting mountain portions 31 of the plurality of outer fitting step portions 4 are arranged in a substantially line in the axial direction Y. The outer fitting end portion 3 has a thickness of the outer fitting valley portion 33 smaller than that of the outer fitting mountain portion 31 at each outer fitting step portion 4, and the outer fitting mountain portion 31, the outer fitting valley portion 33, and the like. Are alternately formed in the axial direction Y.

  As shown in FIG. 3, the outer fitting end portion 3 has a plate thickness of the outer fitting valley portion 33 of the second outer fitting step portion 42 rather than a plate thickness of the outer fitting valley portion 33 of the first outer fitting step portion 41. Is a big one. The outer fitting end portion 3 has a thickness of the outer fitting valley portion 33 of the third outer fitting step portion 43 equal to or greater than the thickness of the outer fitting valley portion 33 of the second outer fitting step portion 42, and a fourth outer fitting step. The plate thickness of the external fitting valley portion 33 of the portion 44 is set to be equal to or greater than the plate thickness of the external fitting valley portion 33 of the third external fitting step portion 43.

  As shown in FIG. 4, the inner fitting end portion 5 is provided with an inner fitting mountain portion 51 forming a plurality of inner fitting step portions 6 in the axial direction Y of the inner fitting end portion 5. The internal fitting step portion 6 is formed, for example, so that the number of steps is four in the axial direction Y of the internal fitting end portion 5, and is based on the axial direction Y of the internal fitting end portion 5 from the front end side. It has the 1st internal fitting step part 61, the 2nd internal fitting step part 62, the 3rd internal fitting step part 63, and the 4th internal fitting step part 64 in order to the end side.

  The inner fitting end portion 5 has a thickness of the inner fitting groove portion 52 smaller than the thickness of the inner fitting mountain portion 51 at each inner fitting step portion 6 so that the inner fitting mountain portion 51 and the inner fitting groove portion 52 are surrounded by the inner fitting groove portion 52. They are alternately formed in the direction W, and the inner fitting mountain portions 51 of the plurality of inner fitting step portions 6 are arranged in a substantially line in the axial direction Y. The inner fitting end portion 5 has a thickness of the inner fitting valley portion 53 smaller than the thickness of the inner fitting mountain portion 51 at each inner fitting step portion 6, and the inner fitting mountain portion 51, the inner fitting valley portion 53, and the like. Are alternately formed in the axial direction Y.

  As shown in FIG. 5, the inner fitting end portion 5 has a plate thickness of the inner fitting valley portion 53 of the second inner fitting step portion 62 rather than a plate thickness of the inner fitting valley portion 53 of the first inner fitting step portion 61. Is a big one. The inner fitting end portion 5 has a plate thickness of the inner fitting valley portion 53 of the third inner fitting step portion 63 that is equal to or greater than the plate thickness of the inner fitting valley portion 53 of the second inner fitting step portion 62, and the fourth inner fitting step. The plate thickness of the internal fitting valley portion 53 of the portion 64 is set to be equal to or greater than the plate thickness of the internal fitting valley portion 53 of the third internal fitting step portion 63.

  As shown in FIGS. 6 and 7, the steel pipe pile rotation prevention structure 7 to which the present invention is applied is formed by fitting the outer fitting end portion 3 and the inner fitting end portion 5 to each other, thereby The second steel pipe pile 2 is connected to each other.

  As shown in FIG. 6, the steel pipe pile rotation restraining structure 7 to which the present invention is applied is first configured such that the inner fitting end portion 5 attached to the second steel pipe pile 2 is attached to the first steel pipe pile 1. It is inserted into the fitting end 3.

  The steel pipe pile rotation restraint structure 7 to which the present invention is applied has a height in the axis orthogonal direction X of the inner fitting mountain part 51 in each inner fitting step part 6 in the axis orthogonal direction X of the outer fitting groove part 32. The inner fitting mountain portion 51 is passed through the outer fitting groove portion 32 as the depth or less. In the steel pipe pile rotation restraining structure 7 to which the present invention is applied, in each of the external fitting step portions 4, the height of the external fitting mountain portion 31 in the axial center orthogonal direction X is set to the height of the internal fitting groove portion 52 in the axial center orthogonal direction X. The outer fitting mountain portion 31 is passed through the inner fitting groove portion 52 as the depth or less.

  Next, as shown in FIG. 7, the steel pipe pile rotation restraining structure 7 to which the present invention is applied has the first steel pipe pile 1 and the second steel pipe 1 with the inner fitting end portion 5 inserted into the outer fitting end portion 3. The steel pipe pile 2 is rotated relative to the circumferential direction W around the axis. The steel pipe pile rotation restraint structure 7 to which the present invention is applied causes the first steel pipe pile 1 and the second steel pipe pile 2 to rotate relative to each other so that the outer fitting end portion 3 and the inner fitting end portion 5 are in the circumferential direction W. Relative rotation.

  The steel pipe pile rotation restraining structure 7 to which the present invention is applied has a depth in the axial orthogonal direction X of the internal fitting valley 53 in each internal fitting step part 6, and the axial orthogonal direction X of the external fitting mountain part 31. The outer fitting mountain portion 31 is fitted into the inner fitting valley portion 53 so as to be equal to or higher than the height. The steel pipe pile rotation restraining structure 7 to which the present invention is applied has the depth of the axially perpendicular direction X of the externally fitting valley portion 33 in each of the externally fitted stepped portions 4, and the axially orthogonal direction X of the internally fitted mountain portion 51. The inner fitting mountain portion 51 is fitted into the outer fitting valley portion 33 so as to be equal to or higher than the height.

  The steel pipe pile rotation restraining structure 7 to which the present invention is applied connects the first steel pipe pile 1 and the second steel pipe pile 2, and as shown in FIG. 8, the outer fitting tip 34 of the outer fitting end 3. And the inner fitting base end portion 55 of the inner fitting end portion 5 is disposed to face each other in the axial direction Y. At this time, the rotation prevention structure 7 of the steel pipe pile to which the present invention is applied includes the outer fitting mountain portion 31 and the inner fitting mountain portion 51 in the axial direction Y in each of the outer fitting step portion 4 and the inner fitting step portion 6. They are engaged with each other.

  The steel pipe pile rotation restraining structure 7 to which the present invention is applied has the first steel pipe pile 1 and the second steel pipe pile 2 connected to each other on the front end side of the outer fitting end part 3 and the inner fitting tip part 34 and the inner part. The fitting base end portion 55 is brought into contact with the inner fitting end portion 5, and the inner fitting distal end portion 54 and the outer fitting base end portion 35 are brought into contact with each other on the distal end side of the inner fitting end portion 5. In the steel pipe pile rotation suppression structure 7 to which the present invention is applied, the distal end side of the outer fitting end portion 3 is separated from the outer fitting distal end portion 34 and the inner fitting proximal end portion 55, or the inner fitting end portion 5 of the inner fitting end portion 5. The inner fitting distal end portion 54 and the outer fitting proximal end portion 35 may be separated from each other on the distal end side.

  The steel pipe pile rotation restraint structure 7 to which the present invention is applied is a state in which the first steel pipe pile 1 and the second steel pipe pile 2 are connected to each other from the first steel pipe pile 1 and the second steel pipe pile 2 to the external fitting end 3. And a tensile force and a compressive force act on the inner fitting end portion 5 in the axial direction Y. In the steel pipe pile rotation restraint structure 7 to which the present invention is applied, the outer fitting mountain portion 31 and the inner fitting mountain portion 51 are in contact with each other in the axial direction Y against the tensile force and compressive force acting in the axial direction Y. It comes in contact and resists.

  As shown in FIG. 9, the steel pipe pile rotation restraining structure 7 to which the present invention is applied has a protrusion 71 projecting in the axial direction Y on the distal end side of the outer fitting end 3 as shown in FIG. 9. A groove portion 72 formed in the fitting distal end portion 34 and notched in the axial direction Y is formed in the inner fitting proximal end portion 55 on the proximal end side of the inner fitting end portion 5.

  The outer fitting tip 34 protrudes in the axial direction Y from the tip surface of the outer fitting tip 34 on the tip side of the outer fitting end 3, and has the same thickness as the outer fitting groove 32, and has an outer fitting end. A substantially rectangular protrusion 71 is formed at one or more locations continuously from the outer surface of the portion 3. The inner fitting base end 55 is notched in the axial direction Y from the base end surface of the inner fitting base end 55 on the base end side of the inner fitting end 5, and has a depth equal to or greater than the plate thickness of the protrusion 71. Thus, a substantially rectangular groove 72 is formed at one or more locations in a concave shape from the outer surface of the inner fitting end 5 in the axial direction X.

  As shown in FIG. 10, the outer fitting front end 34 has a thickness substantially the same as that of the outer fitting mountain portion 31 on the front end side of the outer fitting end 3, as shown in FIG. 10, and the outer surface of the outer fitting end 3. A protrusion 71 having a substantially rectangular shape or the like may be formed continuously. At this time, in the first modification, the inner fitting base end portion 55 is a groove portion 72 having a substantially rectangular shape or the like at a base end side of the inner fitting end portion 5 with a depth equal to or greater than the plate thickness of the outer fitting mountain portion 31. Will be formed.

  As shown in FIG. 11, the outer fitting tip 34 is substantially the same as the height of the outer fitting mountain portion 31 protruding in the axis-perpendicular direction X on the tip side of the outer fitting end 3, as shown in FIG. 11. A protrusion 71 having a substantially rectangular shape or the like may be formed continuously from the inner surface of the outer fitting mountain portion 31 with a plate thickness. At this time, the inner fitting base end portion 55 has a depth equal to or higher than the height at which the outer fitting mountain portion 31 protrudes in the axial center orthogonal direction X on the proximal end side of the inner fitting end portion 5 in the second modification. The groove portion 72 having a substantially rectangular shape or the like is formed inside the outer surface of the inner fitting end portion 5 without cutting out the outer surface of the inner fitting end portion 5.

  As shown in FIG. 12, the protruding portion 71 inserts the inner fitting end portion 5 into the outer fitting end portion 3 with the outer fitting distal end portion 34 and the inner fitting base end portion 55 facing each other in the axial direction Y. By this, it will be in the state inserted in the groove part 72 of the internal fitting base end part 55 in the axial direction Y. The protruding portion 71 is in contact with the groove portion 72 of the inner fitting base end portion 55 in the axial direction Y on the distal end side of the outer fitting end portion 3 or is separated from the groove portion 72 of the inner fitting base end portion 55. .

  As shown in FIG. 13A, the protrusion 71 has a width in the circumferential direction W substantially the same as the width in the circumferential direction W of the inner fitting groove 52, and the protrusion side surface 71 a in the circumferential direction W It is provided in alignment with the end surface 31a in the circumferential direction W. The groove 72 has a width in the circumferential direction W that is substantially the same as the width in the circumferential direction W that combines the inner fitting mountain 51 and the protrusion 71, and the groove side surface 72 a in the circumferential direction W has a circumferential direction W in the inner fitting mountain 51. The one end surface 51a is aligned with the position.

  As shown in FIG. 13 (b), the protrusion 71 moves along the side of the internal fitting mountain portion 51 simultaneously with the movement of the external fitting mountain portion 31 in the axial direction Y. When the portion 5 is inserted into the outer fitting end portion 3, the portion 5 is naturally inserted into the groove portion 72 whose width in the circumferential direction W is larger than the width of the inner fitting mountain portion 51 by the width of the projection portion 71.

  As shown in FIG. 13C, the protrusion 71 is inserted into the groove 72 when the outer fitting end 3 and the inner fitting end 5 are relatively rotated in the circumferential direction W. The protrusion side surface 71 a comes into contact with the groove side surface 72 a and is locked to the groove portion 72 in the circumferential direction W by moving in the circumferential direction W by the width of the peak portion 51.

  As shown in FIG. 14, the protrusion 71 and the groove 72 are separated from each other in the circumferential direction W with the outer fitting end 3 and the inner fitting end 5 relatively rotated in the circumferential direction W and locked together. The key member 74 is fitted into the gap 73 formed in this manner from the outside of the outer fitting distal end portion 34 and the inner fitting proximal end portion 55. The key member 74 is made of a substantially rectangular steel material or the like, and is fixed to the groove portion 72 with a pin member 75 or the like.

  As shown in FIGS. 15 and 16, the protrusion 71 has a width in the circumferential direction W smaller than that of the inner fitting groove 52, so that the protrusion side surface 71 a in the circumferential direction W It is provided in alignment with the end surface 31a in the circumferential direction W. As a first modification, the groove portion 72 has a width equal to or greater than the width in the circumferential direction W including the inner fitting mountain portion 51 and the projection portion 71, and the groove portion side surface 72 a in the circumferential direction W is in the circumferential direction W of the inner fitting mountain portion 51. The one end surface 51a is aligned with the position.

  As shown in FIGS. 17 and 18, the protruding portion 71 has a width in the circumferential direction W that is approximately twice the width in the circumferential direction W of the inner fitting groove 52 as shown in FIGS. 17 and 18. The width in the circumferential direction W is further increased, and the protruding side surface 71 a in the circumferential direction W is provided in alignment with the other end surface 31 b in the circumferential direction W of the external fitting mountain portion 31. As a second modification, the groove 72 has a circumferential width W substantially equal to the width in the circumferential direction W including the inner fitting groove 52 and the protrusion 71, and the groove side surface 72 a in the circumferential direction W 51, the first end surface 51a and the other end surface 51b are aligned with each other.

  As shown in FIGS. 19 and 20, the protrusion 71 has a circumferential width W substantially the same as the width of the inner fitting groove 52 in the circumferential direction W as shown in FIGS. It is formed in a tapered shape inclined in the circumferential direction W. As a third modified example, the groove portion 72 has a width in the circumferential direction W substantially the same as a width in the circumferential direction W in which the inner fitting mountain portion 51 and the projecting portion 71 are combined, and is circumferential in the proximal end side of the inner fitting groove portion 52. The groove side surface 72a of W is formed in a tapered shape inclined in the circumferential direction W.

  In the third modified example, the protrusion 71 and the groove 72 are engaged with each other by relatively rotating the outer fitting end 3 and the inner fitting end 5 in the circumferential direction W as shown in FIG. In this state, the contact surfaces 70 that are in contact with each other in the circumferential direction W are formed in a tapered shape inclined in the circumferential direction W.

  As long as the protrusion 71 and the groove 72 are engaged with each other in the circumferential direction W by rotating the outer fitting end 3 and the inner fitting end 5 relative to each other in the circumferential direction W, the protrusion 71 and the groove 72 are not limited. It may be formed in a position, and may be formed in any quantity, shape, or the like.

  Next, 2nd Embodiment of the rotation suppression structure 7 of the steel pipe pile to which this invention is applied is described. In addition, about the component same as the component mentioned above, the description below is abbreviate | omitted by attaching | subjecting the same code | symbol.

  As shown in FIG. 21, the steel pipe pile rotation restraining structure 7 to which the present invention is applied has a protrusion 71 projecting in the axial direction Y on the distal end side of the internally fitted end 5 as shown in FIG. 21. A groove portion 72 formed in the fitting distal end portion 54 and notched in the axial direction Y is formed in the outer fitting proximal end portion 35 on the proximal end side of the outer fitting end portion 3. At this time, the rotation prevention structure 7 of the steel pipe pile to which the present invention is applied is formed with a protrusion 71 projecting in the axial direction Y on the distal end side of the outer fitting end 3 on the outer fitting distal end 34. A groove portion 72 that is notched in the axial direction Y may be formed in the inner fitting base end portion 55 on the proximal end side of the inner fitting end portion 5.

  The inner fitting front end portion 54 protrudes in the axial direction Y from the front end surface of the inner fitting front end portion 54 on the front end side of the inner fitting end portion 5, and has the same plate thickness as the inner fitting groove portion 52. A substantially rectangular protrusion 71 is formed at one or more locations continuously from the inner surface of the portion 5. The outer fitting base end 35 is notched in the axial direction Y from the base end surface of the outer fitting base end 35 on the base end side of the outer fitting end 3, and has a depth equal to or greater than the plate thickness of the protrusion 71. Thus, a substantially rectangular groove 72 is formed in one or more places in a concave shape from the inner surface of the outer fitting end 3 in the axial center orthogonal direction X.

  As shown in FIG. 22, the inner fitting front end portion 54 has a plate thickness substantially the same as that of the inner fitting mountain portion 51 on the front end side of the inner fitting end portion 5 as shown in FIG. A protrusion 71 having a substantially rectangular shape or the like may be formed continuously. At this time, the outer fitting base end portion 35 is a groove portion 72 having a substantially rectangular shape or the like on the base end side of the outer fitting end portion 3 with a depth equal to or greater than the plate thickness of the inner fitting mountain portion 51 in the first modification. Will be formed.

  As shown in FIG. 23, the inner fitting front end portion 54 is substantially the same as the height of the inner fitting mountain portion 51 projecting in the axial center orthogonal direction X on the front end side of the inner fitting end portion 5 as shown in FIG. A protrusion 71 having a substantially rectangular shape or the like may be formed continuously from the outer surface of the inner fitting mountain portion 51 with a plate thickness. At this time, in the second modification, the outer fitting base end portion 35 has a depth equal to or higher than the height of the inner fitting mountain portion 51 protruding in the axial direction orthogonal X on the base end side of the outer fitting end portion 3. The groove 72 having a substantially rectangular shape or the like is formed inside the inner surface of the outer fitting end portion 3 without cutting out the inner surface of the outer fitting end portion 3.

  As shown in FIG. 24, the protruding portion 71 inserts the inner fitting end portion 5 into the outer fitting end portion 3 with the inner fitting distal end portion 54 and the outer fitting base end portion 35 facing each other in the axial direction Y. By this, it will be in the state inserted in the groove part 72 of the external fitting base end part 35 in the axial direction Y. The protruding portion 71 is in contact with the groove portion 72 of the outer fitting base end portion 35 in the axial direction Y on the distal end side of the inner fitting end portion 5 or is separated from the groove portion 72 of the outer fitting base end portion 35. .

  As shown in FIG. 25A, the protrusion 71 has a width in the circumferential direction W substantially the same as the width in the circumferential direction W of the external fitting groove 32, and the protrusion side surface 71 a in the circumferential direction W It is provided in alignment with the end surface 51a in the circumferential direction W. The groove portion 72 has a width in the circumferential direction W substantially the same as a width in the circumferential direction W including the outer fitting mountain portion 31 and the protrusion 71, and the groove portion side surface 72 a in the circumferential direction W has a circumferential direction W in the outer fitting mountain portion 31. The one end surface 31a is aligned with the position.

  As shown in FIG. 25 (b), the protruding portion 71 moves along the side of the outer fitting mountain portion 31 at the same time as the inner fitting mountain portion 51 moves in the axial direction Y. When the portion 5 is inserted into the outer fitting end portion 3, the portion 5 is naturally inserted into the groove portion 72 whose width in the circumferential direction W is larger than the width of the outer fitting mountain portion 31 by the width of the protruding portion 71.

  As shown in FIG. 25 (c), the protrusion 71 is inserted into the groove 72 when the outer fitting end 3 and the inner fitting end 5 are relatively rotated in the circumferential direction W. The protrusion side surface 71 a is brought into contact with the groove side surface 72 a and is locked to the groove portion 72 in the circumferential direction W by moving in the circumferential direction W by the width of the peak portion 31.

  As a first modification, the protrusion 71 is provided with a width in the circumferential direction W smaller than that of the external fitting groove 32. As a first modification, the groove portion 72 is provided with a width equal to or greater than the width in the circumferential direction W including the internal fitting mountain portion 51 and the projection portion 71. As a second modification, the protrusion 71 is provided with a larger width in the circumferential direction W than the outer fitting groove 32. As a second modification, the groove portion 72 is provided with a width in the circumferential direction W that is substantially the same as a width in the circumferential direction W including the outer fitting groove portion 32 and the protrusion 71.

  As a third modification, the protrusion 71 is formed in a tapered shape in which the protrusion side surface 71 a in the circumferential direction W is inclined in the circumferential direction W. As a third modification, the groove portion 72 is formed in a tapered shape in which a groove portion side surface 72 a in the circumferential direction W is inclined in the circumferential direction W. In the third modification, the protrusion 71 and the groove 72 abut each other in the circumferential direction W with the outer fitting end 3 and the inner fitting end 5 being relatively rotated in the circumferential direction W and locked together. The contact surface 70 to be formed is formed in a tapered shape inclined in the circumferential direction W.

  As shown in FIGS. 9, 21, etc., the steel pipe pile rotation suppression structure 7 to which the present invention is applied has an outer fitting mountain portion 31 and an inner fitting mountain portion 51 in both the first embodiment and the second embodiment. Independently, a protrusion 71 is formed at the outer fitting distal end 34 or the inner fitting distal end 54, and a groove 72 is formed at the outer fitting proximal end 35 or the inner fitting proximal end 55.

  At this time, the steel pipe pile rotation restraint structure 7 to which the present invention is applied has an outer fitting end portion 3 and an inner fitting end portion 5 that are more than necessary in one direction in the circumferential direction W, as shown in FIG. When the relative rotation is attempted, the projection side surface 71 a of the projection 71 and the groove side surface 72 a of the groove 72 come into contact with each other, and the rotational force in the circumferential direction W is transmitted from the groove 72 to the projection 71.

  Moreover, as shown in FIG.26 (b), the rotation suppression structure 7 of the steel pipe pile to which this invention is applied is because the key member 74 is engage | inserted by the space | gap part 73, and the external fitting end part 3 and the internal fitting end part 5 are included. When the key member 74 is sandwiched between the protrusion side surface 71 a of the protrusion 71 and the groove side surface 72 a of the groove 72, the key member 74 is inserted into the key from the groove 72 and the protrusion 71. The rotational force in the circumferential direction W is transmitted to the member 74.

  In the steel pipe pile rotation restraining structure 7 to which the present invention is applied, when the outer fitting end 3 and the inner fitting end 5 are to be rotated relative to each other in the circumferential direction W, the protrusion 71 or the key member 74 has a circumferential direction W. As a result, the relative rotation of the outer fitting end portion 3 and the inner fitting end portion 5 is suppressed more than necessary, and the rotation resistance force is exhibited.

  The steel pipe pile rotation restraint structure 7 to which the present invention is applied is independent of the outer fitting mountain portion 31 and the inner fitting mountain portion 51, and is formed with a projection 71 and a groove 72 for exerting a rotational resistance force. Without transmitting the tensile force or compressive force in the axial direction Y to the protrusion 71 and the groove portion 72, the outer fitting mountain portion 31 and the inner fitting mountain portion 51 independently exert the axial resistance force against the tensile force or the compressive force. Can be made.

  As a result, the steel pipe pile rotation restraint structure 7 to which the present invention is applied causes the outer fitting mountain portion 31 and the inner fitting mountain portion 51 to bear the axial resistance force, and the projection portion 71 and the groove portion 72 bear the rotation resistance force. Since the structural calculation for making it possible to be performed independently and easily, the design accuracy of the entire joint is improved, and a reliable connection state between the first steel pipe pile 1 and the second steel pipe pile 2 is ensured. Is possible.

  As shown in FIG. 26, the steel pipe pile rotation restraint structure 7 to which the present invention is applied is configured so that when the outer fitting end 3 and the inner fitting end 5 are relatively rotated in the circumferential direction W, the protrusion 71 or The protrusion 71 or the key member 74 is purely compressed in the circumferential direction W without applying an external force in the axial direction Y to the key member 74.

  Thereby, the steel pipe pile rotation suppression structure 7 to which the present invention is applied prevents the protrusion 71 or the key member 74 from being purely compressed, and prevents the protrusion 71 or the key member 74 from being rotationally deformed in the in-plane direction. Therefore, it is possible to fully utilize the material strength of the protrusion 71 or the key member 74 to improve the rotational resistance force that suppresses the relative rotation of the outer fitting end 3 and the inner fitting end 5 more than necessary. Is possible.

  The steel pipe pile rotation restraint structure 7 to which the present invention is applied is set such that the material strength of the key member 74 is set lower than that of the protrusion 71 in consideration of the reverse rotation of the steel pipe pile in which the rotational force during construction is relatively weak. You can also The steel pipe pile rotation restraining structure 7 to which the present invention is applied is more than necessary for the outer fitting end portion 3 and the inner fitting end portion 5 by appropriately changing the relative material strength of the key member 74 and the protrusion 71. It is possible to appropriately adjust the rotational resistance force that suppresses the relative rotation of the steel pipe according to the rotation direction of the steel pipe pile.

  In the steel pipe pile rotation suppression structure 7 to which the present invention is applied, the protrusion 71 and the groove 72 are formed independently of the outer fitting mountain 31 and the inner fitting mountain 51, and therefore the outer portion bearing the axial resistance force. A cross-sectional defect or the like is not generated in the fitting mountain portion 31 and the inner fitting mountain portion 51.

  Thereby, when the rotation suppression structure 7 of the steel pipe pile to which this invention is applied is compared with the case where the protrusion part 71 or the groove part 72 is formed in the external fitting mountain part 31 or the internal fitting mountain part 51, the external fitting mountain part 31 and It is possible to improve the tensile strength and compression strength of the internal fitting peak portion 51 and to sufficiently secure the axial core resistance.

  The steel pipe pile rotation inhibiting structure 7 to which the present invention is applied does not require the key member 74 to be temporarily fixed inside the outer fitting end portion 3 or the inner fitting end portion 5 in advance. The key member 74 is fitted into the gap 73 from the outside of the inner fitting base end 55.

  Thereby, since the rotation suppression structure 7 of the steel pipe pile to which this invention is applied does not require temporary fixing etc. of the key member 74, it implements a complicated process etc. to the outer fitting end part 3 and the inner fitting end part 5 etc. In addition, it is possible to easily introduce a structure for suppressing the relative rotation between the first steel pipe pile 1 and the second steel pipe pile 2.

  The steel pipe pile rotation inhibiting structure 7 to which the present invention is applied has a plurality of protrusions 71 formed on the outer fitting distal end portion 34 or the inner fitting distal end portion 54, and an outer fitting proximal end portion 35 or inner fitting proximal end portion 55. In addition, a plurality of groove portions 72 can be formed, and the plurality of protrusion portions 71 can be locked by the plurality of groove portions 72.

  Thereby, since the rotation prevention structure 7 of the steel pipe pile to which this invention is applied has the some protrusion part 71 latched by the some groove part 72 in the circumferential direction W, the outer fitting end part 3 and the inner fitting end part 5 and Therefore, it is possible to improve the rotational resistance that suppresses the relative rotation more than necessary.

  Furthermore, as shown in FIGS. 19 and 20, the steel pipe pile rotation restraint structure 7 to which the present invention is applied has a groove portion side surface 72 a formed in a tapered shape in the third modified example of the protrusion portion 71 and the groove portion 72. A locking portion 76 formed without being cut out at the outer fitting base end portion 35 or the inner fitting base end portion 55 is provided. At this time, the steel pipe pile rotation suppression structure 7 to which the present invention is applied has adjacent groove portions 72 continuous in the circumferential direction W, and a large number of groove portions 72 are formed in the outer fitting base end portion 35 or the inner fitting base end portion 55. Can be made.

  Thereby, the rotation suppression structure 7 of the steel pipe pile to which the present invention is applied has a large number of groove portions 72 formed in the outer fitting base end portion 35 or the inner fitting base end portion 55, so that a large number of protrusions 71 are formed in a large number. It is possible to remarkably improve the rotational resistance between the outer fitting end portion 3 and the inner fitting end portion 5 by engaging with the groove portion 72 and fitting a large number of key members 74 into the large number of gap portions 73. It becomes.

  As shown in FIGS. 9, 10, and 22, the steel pipe pile rotation restraint structure 7 to which the present invention is applied has a protrusion 71 continuously from the outer surface of the outer fitting end portion 3 or the outer surface of the inner fitting mountain portion 51. By being formed, positioning by visual observation or the like when inserting the protruding portion 71 into the groove portion 72 is facilitated, and the connecting work between the first steel pipe pile 1 and the second steel pipe pile 2 can be performed efficiently. It becomes.

  Here, in the case of the conventional structure in which the protruding portion 71 and the groove portion 72 are not formed, the inner fitting groove portion 52 of the inner fitting end portion 5 is moved in the axial direction Y to the outer fitting mountain portion 31 of the outer fitting end portion 3. At the time of insertion, it is confirmed by looking into the inner fitting mountain portion 51 entering the outer fitting groove portion 32 so that the rotational position in the circumferential direction W does not shift. The rotation suppression structure 7 of the steel pipe pile to which the present invention is applied is confirmed without looking into the position in the circumferential direction W between the protrusion 71 and the groove 72 when the inner fitting end 5 is inserted into the outer fitting end 3. Since the positioning of the inner fitting mountain portion 51 and the outer fitting groove portion 32 in the circumferential direction W can be performed simultaneously, the connecting work between the first steel pipe pile 1 and the second steel pipe pile 2 can be easily performed. It becomes possible to carry out.

  As shown in FIGS. 11 and 23, the steel pipe pile rotation restraining structure 7 to which the present invention is applied has a groove 72 on the inner side of the outer fitting end 3 without cutting out the inner surface of the outer fitting end 3. The groove portion 72 is formed on the inner side of the outer surface of the inner fitting end portion 5 without cutting out the outer surface of the inner fitting end portion 5, so that the inner surface or the inner fitting end portion of the outer fitting end portion 3 is formed. Thus, it is possible to prevent the protrusion 71 from being buckled and deformed in the direction X perpendicular to the axial center.

  As mentioned above, although the example of embodiment of this invention was demonstrated in detail, all the embodiment mentioned above showed only the example of actualization in implementing this invention, and these are the technical aspects of this invention. The range should not be construed as limiting.

  For example, in the steel pipe pile rotation suppression structure 7 to which the present invention is applied, the inner fitting end 5 is attached to the first steel pipe pile 1 and the outer fitting end 3 is attached to the second steel pipe pile 2. Also good. Moreover, the rotation prevention structure 7 of the steel pipe pile to which this invention is applied is what the outer fitting step part 4 and the inner fitting step part 6 have one or more steps in the axial direction Y of the outer fitting end part 3 and the inner fitting end part 5. It may be formed by the number of steps. Furthermore, the rotation suppression structure 7 of the steel pipe pile to which the present invention is applied is obtained by cutting the end of the first steel pipe pile 1 or the second steel pipe pile 2 to the first steel pipe pile 1 or the second steel pipe pile 2 itself. An external fitting end 3 or an internal fitting end 5 may be provided.

  Further, in the steel pipe pile rotation suppression structure 7 to which the present invention is applied, the outer fitting mountain portions 31 of the plurality of outer fitting step portions 4 and the inner fitting mountain portions 51 of the plurality of inner fitting step portions 6 are in the axial direction Y. May be arranged in a substantially staggered pattern. Furthermore, the rotation prevention structure 7 of the steel pipe pile to which the present invention is applied has the same thickness of the outer fitting valley portion 33 and the inner fitting valley portion 53 in each of the outer fitting step portion 4 and the inner fitting step portion 6. As above, a plurality of outer fitting stepped portions 4 and inner fitting stepped portions 6 may be formed in a straight shape.

1: 1st steel pipe pile 2: 2nd steel pipe pile 3: Outer fitting end part 31: Outer fitting mountain part 32: Outer fitting groove part 33: Outer fitting trough part 34: Outer fitting tip part 35: Outer fitting base end part 4: External fitting step portion 41: First external fitting step portion 42: Second external fitting step portion 43: Third external fitting step portion 44: Fourth external fitting step portion 5: Internal fitting end portion 51: Internal fitting mountain portion 52: Internal fitting groove portion 53: Internal fitting valley portion 54: Internal fitting distal end portion 55: Internal fitting base end portion 6: Internal fitting step portion 61: First internal fitting step portion 62: Second internal fitting step portion 63: Third internal fitting Step part 64: Fourth internal fitting step part 7: Rotation inhibiting structure 70: Contact surface 71: Projection part 71a: Projection side surface 72: Groove part 72a: Groove part side surface 73: Gap part 74: Key member 75: Pin member 76 Stop part W: Circumferential direction X: Axial axis orthogonal direction Y: Axial axis direction

Claims (6)

A rotation prevention structure for a steel pipe pile that inhibits relative rotation between the first steel pipe pile and the second steel pipe pile,
An outer fitting end portion and an inner fitting end portion for connecting the first steel pipe pile and the second steel pipe pile in the axial direction;
The outer fitting end portion includes an outer fitting mountain portion that is formed to protrude inward in a direction perpendicular to the axis, an outer fitting groove portion that is formed adjacent to the outer fitting mountain portion in the circumferential direction, and the outer fitting mountain. An outer fitting trough formed on the proximal end side in the axial direction from the portion, an outer fitting distal end portion provided on the distal end side in the axial direction, and an outer fitting proximal end portion provided on the proximal end side in the axial direction Have
The inner fitting end portion includes an inner fitting mountain portion formed to protrude outward in the direction perpendicular to the axis, an inner fitting groove portion formed adjacent to the inner fitting mountain portion in the circumferential direction, and the inner fitting mountain. An inner fitting valley formed on the proximal side in the axial direction from the portion, an inner fitting distal end provided on the distal side in the axial direction, and an inner fitting proximal end provided on the proximal side in the axial direction Have
Either one or both of the outer fitting front end and the inner fitting front end is formed with a protrusion protruding in the axial direction,
Either one or both of the outer fitting base end portion and the inner fitting base end portion is formed with a groove portion cut out in the axial direction,
The protrusion is locked to the groove in the circumferential direction by rotating the outer fitting end and the inner fitting end in the circumferential direction while being inserted into the groove in the axial direction.
The groove portion is provided independently from the outer fitting mountain portion and the inner fitting mountain portion ,
The circumferential width of the groove, the rotation inhibiting structure of the steel pipe pile, characterized in Rukoto is larger than the circumferential width of said protrusions. Either one or both of the outer fitting front end and the inner fitting front end is configured such that the circumferential width of the projection is smaller than the circumferential width of the outer fitting groove or the inner fitting groove. The steel pipe pile rotation-inhibiting structure according to claim 1, wherein a portion is formed. Either one or both of the outer fitting front end and the inner fitting front end is configured such that the circumferential width of the projection is larger than the circumferential width of the outer fitting groove or the inner fitting groove. The steel pipe pile rotation-inhibiting structure according to claim 1, wherein a portion is formed. Either one or both of the outer fitting front end and the inner fitting front end is configured so that the circumferential width of the projection is substantially the same as the circumferential width of the outer fitting groove or the inner fitting groove. The steel pipe pile rotation-inhibiting structure according to claim 1, wherein a portion is formed. The projecting portion and the groove portion are inclined in the circumferential direction in contact with each other in a state where the outer fitting end portion and the inner fitting end portion are relatively rotated in the circumferential direction and locked together. It forms in taper shape. The rotation suppression structure of the steel pipe pile of any one of Claims 1-4 characterized by the above-mentioned. The projecting part and the groove part have a key member in a gap part formed apart from each other in a state in which the outer fitting end part and the inner fitting end part are rotated relative to each other in the circumferential direction. The steel pipe pile rotation-inhibiting structure according to any one of claims 1 to 5, wherein the structure is fitted.

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