JP2017190666A - Joining structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joining structure capable of easily joining a rod-like body such as a pile with another member without requiring welding work or without attaching any member to an outer peripheral surface of the rod-like body.SOLUTION: A joining structure of this invention for joining a rod-like body having an opening on an end with another member includes: a first member having an abutment surface portion along an inner peripheral surface of an opening, and arranged along an edge of the opening in a state that the abutment surface portion is brought into contact with the inner peripheral surface; and a second member engaged with the first member, and having a pressing surface portion for pressing the first member in a direction for making the abutment surface portion adhere closely to the inner peripheral surface.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a joining structure for joining another member to a rod-like body having an opening at an end of a steel pipe pile or the like.

  In the field of civil engineering and architecture, foundations are constructed when constructing structures. As a foundation for supporting a structure, for example, there are a structure constructed by placing concrete on site and a structure constructed by penetrating a ready-made pile into the ground. When placing concrete, in addition to the problem that a large amount of excavated residual soil is generated, it takes time to cure after placing concrete. From the start of construction of the foundation to the start of construction of the structure There is a problem that it takes time. Therefore, in recent years, various piles such as steel pipe piles capable of suppressing excavation residual soil, shortening construction time, and early construction start have been frequently used, and various improvements have been proposed (for example, patent documents). 1-2).

Japanese Patent No. 5329419 JP2013-163890A

  The piles that support the structure are required to demonstrate appropriate support. As a measure for improving the bearing capacity of the pile, for example, it is conceivable to lengthen the pile. If the pile is made longer, it is possible to obtain a supporting force that supports a large-scale structure. However, the length of the pile may be limited by the convenience of the transportation means during transportation and various other factors. Therefore, for example, at the site where steel pipe piles are used, attempts are made to join the piles and steel pipes by welding or to connect them using joint members, but the former welding work depends on the weather, Moreover, the latter joint may become an obstacle when the joint member attached to the outer peripheral surface of the connecting part penetrates the pile.

  Therefore, the present application discloses a joining structure that does not require welding work and that can join the rod-like body to another member without attaching any member to the outer peripheral surface of the rod-like body such as a pile.

  In order to solve the above problems, the present invention provides a pressing surface portion that presses the first member in a state where the first member having a contact surface portion along the inner peripheral surface of the opening of the rod-shaped body is disposed along the edge of the opening. It decided to engage the 2nd member which has these with the 1st member.

  Specifically, the present invention is a joining structure for joining another member to a rod-like body having an opening at an end, and has a contact surface along the inner peripheral surface of the opening. A first member disposed along the edge of the opening in a state of contacting the inner peripheral surface, and a pressing surface portion that is engaged with the first member and presses the first member in a direction in which the contact surface portion is in close contact with the inner peripheral surface And a convex portion is provided on the inner peripheral surface of the opening, and a concave portion along the convex portion is provided on the contact surface portion.

In such a joining structure, since the second member is first engaged with the first member in the opening after the first member is inserted into the opening at the end of the rod-like body, the first member is the rod-like body. It will be in the state pressed by the inner peripheral surface of the opening part. Therefore, the first member is in close contact with the inner peripheral surface of the opening. In addition, since the first member is inserted into the opening and the second member is also engaged with the first member in the opening, all the members constituting the joint structure can be basically accommodated in the opening. The rod-shaped body can be joined to other members without having to attach any member to the outer peripheral surface of the rod-shaped body as well as welding work.

  In addition, the 1st member may be a member arrange | positioned 2 or more along the edge of an opening part. If such a first member is used in the joining structure, each first member is pressed against the inner peripheral surface of the opening, so that the members constituting the joining structure are firmly joined to the rod-shaped body. .

  Further, the pressing surface portion may be tapered so as to reduce the diameter toward the distal end direction of the second member. If the pressing surface portion has such a tapered shape, the contact surface portion of the first member is strongly pressed against the inner peripheral surface of the rod-like body due to the wedge effect, so that the members constituting the joint structure are firmly attached to the rod-like body. Be joined.

  Further, the second member may have a constricted portion or a flange portion having at least a pair of flat surfaces parallel to each other at a position located outside the opening portion in a state of being engaged with the first member. . If such a second member is used in the joint structure, the second member can be firmly engaged with the first member using a tool.

  Further, the second member has a male screw portion formed toward the distal end direction of the second member, and the first member is screwed into the male screw portion while being arranged along the edge of the opening. It may have a female screw portion. If such a first member and a second member are used in the joining structure, it is possible to firmly engage the first member only by turning the second member.

  Further, the other member has an opening at the end, and is a second rod-shaped body that is a separate body from the first rod-shaped body that is a rod-shaped body, and the second member includes the first rod-shaped body and the first rod-shaped body. A first male screw portion which is a member which is engaged with each first member of the two rod-shaped body and joins the first rod-shaped body and the second rod-shaped body and which is provided on the first rod-shaped body side; It has a 2nd external thread part which is an external thread part provided in the rod-like body side, and the 1st external thread part may have a thread opposite to the 2nd external thread part. If such a first member and a second member are used in the joint structure, the male screw portions of the second member are inserted into the first members of the first rod and the second rod. The male screw portions can be screwed together by simply turning the two members, and the first rod-like body and the second rod-like body can be joined in a short time.

  Moreover, the 1st member may have a thin part which suppresses the interference to the convex part at the time of being inserted in an opening part. If such a first member is used for the joining structure, it is easy to insert and engage the first member into the opening of the rod-shaped body.

  Moreover, the 1st member may have a flange part along the end surface of the opening part in the edge part of a rod-shaped body. If such a 1st member is used for the said joining structure, since a 1st member can be easily arrange | positioned to an opening part, it becomes easy to engage a 2nd member with a 1st member.

  In addition, since the convex portion is provided on the inner peripheral surface of the opening, and the concave portion along the convex portion is provided on the contact surface portion of the first member, the concave portion of the first member is the opening portion. Since it engages with the convex portion of the inner peripheral surface, in the state where the first member is pressed against the inner peripheral surface by the second member, the separation of the first member from the opening is structurally impossible. The joint part becomes stronger.

Moreover, the outer peripheral surface of the opening is provided with a recess in which a portion connected to the opening end of the opening is recessed in the circumferential direction, and a portion corresponding to the recess is provided in the circumferential direction on the inner peripheral surface of the opening. It may be provided with a protruding portion protruding along the surface. For example, as a rod-shaped body, even when a straight steel pipe or the like in which the convex portion is not provided on the outer peripheral surface of the opening is used, by using a general-purpose steel pipe diameter reducing device or the like, A recess along the circumferential direction can be easily formed in a portion connected to the open end of the outer peripheral surface. Therefore, according to this joining structure, the rod-like body and the first member can be firmly joined easily at low cost.

  Moreover, the joining structure may further include a tubular third member disposed so as to cover the depression. According to this joining structure, since the tubular third member is arranged so as to cover the depression on the outer peripheral surface of the opening, a force (tensile stress) in a direction in which the rod-shaped body and the first member are separated from each other acts. Even if it is a case, it can suppress that the recessed part of the contact surface part of a 1st member deform | transforms the convex part of the internal peripheral surface of an opening part (diameter expansion). For this reason, the contact | adherence state which the recessed part of the contact surface part was hooked on the convex part of an internal peripheral surface can be maintained. Therefore, the yield strength against tensile stress can be improved.

  Further, the present invention is a joining structure for joining another member to a rod-like body having an opening at an end, and has a contact surface along the inner peripheral surface of the opening. A first member disposed along the edge of the opening in contact with the peripheral surface, and a pressing surface portion that is engaged with the first member and presses the first member in a direction in which the contact surface portion is in close contact with the inner peripheral surface. A straight pipe in which a convex portion is not provided on the inner peripheral surface of the opening.

  If it is said joining structure, it will become possible to join the said rod-shaped object to another member, without requiring a welding operation and attaching any member to the outer peripheral surface of rod-shaped objects, such as a pile.

FIG. 1 is a diagram illustrating a member having a joint structure according to an embodiment. FIG. 2 is a view showing how to use the first member and the second member. FIG. 3 is a view showing a joined state between stepped steel pipes. FIG. 4 is a diagram illustrating a state in which the second member presses the two first members. FIG. 5 is a first diagram showing a modification of the second member. FIG. 6 is a second view showing a modification of the second member. FIG. 7 is a view showing a joint structure according to the second embodiment. FIG. 8 is a view showing a joint structure according to the third embodiment.

  Hereinafter, embodiments of the present invention will be described. The embodiment described below is one aspect of the present invention and does not limit the technical scope of the present invention.

  FIG. 1 is a diagram illustrating a member having a joint structure according to an embodiment. In the joining structure according to the embodiment, as shown in FIG. 1, a first member 10 that is a member having a shape in which a cylindrical member is divided in half at intervals, and a bar in which a central portion is swollen The second member 20 which is a member of the form is used.

  On the outer surface side of the first member 10, a contact surface portion 11 is formed along the inner peripheral surface of the opening that the rod-shaped body to be joined has at the end. For this reason, when the “rod-like body” referred to in the present application is a hollow steel pipe, the contact surface portion 11 of the first member 10 has an arc shape having substantially the same radius as the circle forming the inner peripheral surface of the steel pipe.

Further, in this embodiment, a so-called stepped steel pipe provided with depressions on the outer peripheral surface is provided as an example of a “rod-like body” in the present application for the purpose of improving the adhesion strength to the ground, and the joining structure thereof is as follows. Illustrate. For this reason, the abutting surface portion 11 is provided with a concave portion 12 along a convex portion protruding on the inner peripheral surface of the opening portion at the end portion of the stepped steel pipe. The convex part which protrudes to the inner peripheral surface of a stepped steel pipe exists corresponding to the hollow formed in the outer peripheral surface of a stepped steel pipe. However, the 1st member 10 is not limited to the thing in which the recessed part 12 along the convex part which protrudes in the internal peripheral surface of a stepped steel pipe is provided in the contact surface part 11. As shown in FIG. That is, the “rod-like body” as used in the present application is not limited to the type of stepped steel pipe in which the outer peripheral surface of the opening is provided with a recess at a distance, but the type in which the recess is continuously provided on the outer peripheral surface of the opening. Stepped steel pipes, diagonally stepped steel pipes, steel pipes with other depressions such as dimple steel pipes, etc. may be used, and so-called straight pipes (straight steel pipes) having no depressions on the outer peripheral surface of the opening may be used. The contact surface portion 11 of the one member 10 can have an appropriate shape according to the inner peripheral surface of the opening at the end of the rod-shaped body to be joined. In addition, the “convex portion” referred to in the present application may be formed by, for example, forming a depression (step) by pressing the outer peripheral surface of the opening by an appropriate pressing means in a steel pipe forming line. It may be formed by reducing the diameter of an appropriate portion of the steel pipe using a steel pipe diameter reducing device, etc., or by attaching a steel piece to the inner peripheral surface of the steel pipe by welding or forming a weld bead. May be. The steel piece and the weld bead may be attached to the open end of the steel pipe so as to protrude toward the inner peripheral surface side.

  Further, on the inner surface side of the first member 10, a pressed surface portion 13 that is a surface corresponding to the pressing surface portion 21 formed in the vicinity of the central portion of the second member 20, and an end portion of the second member 20. A female screw portion 14 to be screwed to the formed male screw portion 22 is formed. Moreover, the thin part 15 for suppressing the interference to the convex part at the time of being inserted in the opening part of a stepped steel pipe, and making insertion easy is provided in the 1st member 10. As shown in FIG. The thin-walled portion 15 is a thin-walled portion in which the insertion direction side of the first member 10 (downward side in FIG. 1) is cut obliquely. Further, the first member 10 is provided with a flange portion 16 that is engaged with the end surface of the stepped steel pipe.

  The second member 20 has a constricted portion 23 at the center of the second member 20 in addition to the pressing surface portion 21 and the male screw portion 22 described above. Three sets of a pair of flat surfaces 24 parallel to each other are formed in the constricted portion 23, and a tool (such as a spanner) for screwing the male screw portion 22 into the female screw portion 14 of the first member 10 is fitted. Is now possible. Further, the above-described pressing surface portion 21 provided on the second member 20 has a tapered shape that gradually decreases in diameter toward the distal end direction of the second member 20. Moreover, in this embodiment, in order to illustrate the member of the joining structure which joins stepped steel pipes, the press surface part 21 and the above-mentioned external thread part 22 are formed in the both ends by using the middle of the axis line of the 2nd member 20 as a boundary. Has been.

  The first member 10 and the second member 20 are used as follows. FIG. 2 is a view showing how to use the first member 10 and the second member 20. When joining the stepped steel pipes 30 using the first member 10 and the second member 20, first, two of the two stepped steel pipes 30 are provided in the opening 31 at the end of one stepped steel pipe 30. The first member 10 is inserted. Then, the two first members 10 are arranged along the edge of the opening 31 in a state where the contact surface portion 11 of each first member 10 is in contact with the inner peripheral surface 32 of the opening 31 (see FIG. 2A). ). In addition, since the 1st member 10 is a form which divided the cylindrical member at intervals, it interferes with the convex part which protrudes to the internal peripheral surface 32 of the stepped steel pipe 30 corresponding to the hollow 33. It can be inserted into the opening 31 without doing so. Moreover, although the 1st member 10 can be engaged with the edge part of the stepped steel pipe 30 by the flange part 16, when the flange part 16 is not provided or the two stepped steel pipes 30 mentioned later are joined. When the first member 10 is disposed in the opening 31 at the lower end of the other stepped steel pipe 30, the first member 10 may be temporarily fixed to the inner peripheral surface 32 of the stepped steel pipe 30 with an adhesive, a bolt, or the like.

Next, one of the two male screw portions 22 formed at both ends of the second member 20 is inserted into the opening 31 (see FIG. 2B). Then, the second member 20 or the stepped steel pipe 30 is turned in a direction in which the male screw portion 22 is screwed into the female screw portion 14 of the first member 10 (see FIG. 2C). When the second member 20 or the stepped steel pipe 30 is further rotated in the direction in which the male screw portion 22 is screwed into the female screw portion 14, the pressing surface portion 21 of the second member 20 eventually becomes the pressed surface portion 13 of the first member 10. Contact. When the pressing surface portion 21 comes into contact with the pressed surface portion 13, a tool (spanner or the like) is fitted into the constricted portion 23 and the second member 20 is further tightened, whereby the second member 20 becomes the first member 10.
The contact surface portion 11 of the first member 10 is in close contact with the inner peripheral surface 32 of the stepped steel pipe 30 due to the wedge effect by the tapered pressing surface portion 21 (see FIG. 2 (D)).

  FIG. 3 is a view showing a joined state between the stepped steel pipes 30. FIG. 4 is a view showing a state in which the second member 20 presses the two first members 10. After the above-described series of procedures described with reference to FIGS. 2A to 2D is performed on one stepped steel pipe 30, two first members 10 are similarly inserted into the opening 31. The joining structure which joins the two stepped steel pipes 30 by screwing the other stepped steel pipe 30 with the external thread part 22 of the 2nd member 20 which protrudes from the edge part of one stepped steel pipe 30. 1 is completed. As apparent from FIG. 3, in the joint structure 1 according to the present embodiment, the second member 20 is further tightened in a state where the pressing surface portion 21 is in contact with the pressed surface portion 13, and the edge of the stepped steel pipe 30 is Since the second member 20 is engaged with the first member 10 disposed along the inner surface of the stepped steel pipe 30 and the recess 12 provided in the contact surface portion 11 of the first member 10. The convex portion 34 of the surface 32 is in an engaged state. The convex portion 34 is a portion that protrudes from the inner peripheral surface 32 corresponding to the recess 33 in the outer peripheral surface 37 of the stepped steel pipe 30. As apparent from FIG. 3, the second member 20 in which the male screw portion 22 is screwed with the female screw portion 14 of the first member 10 is turned to loosen the screw, and the second member 20 is opened. Unless it is removed from the portion 31, the engagement state between the concave portion 12 and the convex portion 34 is not released. Therefore, if it is the joining structure 1 of this embodiment, welding operation will not be required, and the stepped steel pipes 30 can be joined to each other without attaching any members to the outer peripheral surface 37 of the stepped steel pipe 30.

  In addition, as shown in FIG. 5 etc. mentioned later, as for the external thread part 22 in the both ends of the 2nd member 20, the direction of a screw thread may be a mutually reverse direction. If it is the 2nd member 20 of this form, when joining two stepped steel pipes 30, it does not repeat the procedure of each figure from above-mentioned Drawing 2 (A) to Drawing 2 (D) twice, For example, after inserting the two first members 10 into the respective opening portions 31 at the ends of the stepped steel pipes 30 and simply turning the second member 20 with the male screw portions 22 of the second member 20 inserted. Each male screw part 22 is screwed together, and the two stepped steel pipes 30 can be joined in a short time. In this case, the first member 10 disposed in each stepped steel pipe 30 corresponds to the male screw portions 22 at both ends of the second member 20, and the screw threads of the female screw portion 14 are opposite to each other. Use what is. However, the second member 20 is not limited to one in which the directions of the threads of the two male screw portions 22 are opposite to each other. As shown in FIGS. 1 to 3, the two male screw portions 22 in the second member 20 may have the same thread direction.

  By the way, the 2nd member 20 can also be changed as follows. FIG. 5 is a first diagram showing a modification of the second member 20. In the second member 20, for example, the constricted portion 23 may be omitted as shown in FIG. 5A, or the flat surface 24 of the constricted portion 23 is omitted as shown in FIG. 5B. Alternatively, as shown in FIG. 5C, a flat surface 24 may be formed on the flange portion 25 in place of the constricted portion 23. In particular, if there is a flange portion 25 instead of the constricted portion 23, the end portion of the stepped steel pipe 30 comes into contact with the flange portion 25, so that two steps joined together by the joint structure 1 of the present embodiment. The force applied to the steel pipe 30 can be transmitted more efficiently.

Moreover, the joining structure 1 of this embodiment is applicable to joining of the rod-shaped body which has an opening part in an edge part, and another member, and is not restricted to joining of the above stepped steel pipes 30. FIG. FIG. 6 is a second view showing a modified example of the second member 20. For example, as shown in FIG. 6A, the second member 20 has only one male screw portion 22 and one pressing surface portion 21, and the male screw portion 22 and the pressing surface portion 21. A flange 26 for joining various workpieces such as poles installed on the ground may be provided in a portion where no bolt is provided, or bolts, anchors, and other various joining means are provided. Also good. Moreover, the 2nd member 20 may be provided with the peak-shaped pile front-end | tip part 27, for example, as shown to FIG. 6 (B), or a helical pile front-end | tip part and other various things May be provided.

  Further, the joining structure 1 of the present embodiment is not limited to joining the stepped steel pipe 30. The joining structure 1 of the present embodiment is a joining of hollow steel pipes whose outer peripheral surfaces are not recessed like the stepped steel pipes 30 and only the convex portions are provided on the inner peripheral surfaces near the ends. The first member may be applied to the joining of a generally non-hollow rod-like body in which only the end portion is a concave opening and the convex portion is provided on the inner peripheral surface. The present invention can be applied to any other rod-like body that can be joined by a combination of 10 and the second member 20.

  Further, the joint structure 1 of the present embodiment is not limited to the joining of rod-like bodies having convex portions protruding along the circumferential direction on the inner peripheral surface near the end portions, such as the convex portions 34 of the stepped steel pipe 30. . The joining structure 1 of the present embodiment is applied to joining of a pile or other rod-like body having an oblique projection protruding to the inner peripheral surface, for example, a so-called oblique stepped steel pipe having an oblique recess formed on the outer peripheral surface. Is possible. In addition, the joining structure 1 of the present embodiment is, for example, a so-called dimple steel pipe that protrudes in an annular shape or a protruding portion that protrudes from the inner peripheral surface by concave portions formed discretely so as to be scattered on the outer peripheral surface. The present invention can be applied to joining of rod-shaped bodies having inner protrusions in the vicinity of the end portions of the protrusions, multi-step protrusions formed so as to wave, and other various shapes of protrusions. Further, the joining structure 1 of the present embodiment is not limited to joining rod-like bodies having an overall cylindrical appearance, and can be applied to joining rod-like bodies having a prismatic appearance, for example.

  Moreover, the joining structure 1 of this embodiment is not limited to the one using the second member 20 having the pressing surface portion 21 that is tapered. When the joining structure 1 of the present embodiment is composed of a rod-like body with high dimensional accuracy and is composed of the first member 10 and the second member 20 that are precisely processed, the pressed surface portion 13 and the pressing surface portion 21 are provided. It may be omitted.

  Moreover, although the joining structure 1 of this embodiment is comprised by the 1st member 10 of the form which divided the cylindrical member at intervals, the thing using such a 1st member 10 was used. It is not limited to. In the joining structure 1 of the present embodiment, a first member 10 having a shape in which a cylindrical member is divided into three parts is used, and three first members 10 are used at an opening at an end of a rod-like body. The 1st member 10 of the form which divided | segmented the cylindrical member into 4 or more may be used.

  In the joining structure 1 of the present embodiment, when the joined stepped steel pipe 30 penetrates into the ground as a pile, a method of penetration by striking or the like is preferable. For example, the threaded portion of the male screw portion 22 and the female screw portion 14 So that the second member 20 is further tightened by rotation by forming the screw threads of the male screw portions 22 at both ends of the second member 20 in the same direction. If it is, it can be applied to a method of penetration while rotating. In addition, as a construction method other than penetrating into the ground by rotation or hammering, for example, a method of excavating a pilot hole using an excavation bit or the like, and then installing a pile in the excavation portion and pouring cement into it can be cited.

  Hereinafter, a second embodiment will be described. FIG. 7 is a view showing a joint structure according to the second embodiment. As shown in FIG. 7, the joining structure 1 </ b> A according to the second embodiment has a tubular shape arranged so as to cover the first member 10, the second member 20, and the reduced diameter portion 36 described later of the rod-shaped body 30. A third member 40. In the following embodiments, the same reference numerals are given to the same components as those in the first embodiment, and the description thereof is omitted.

The rod-shaped body 30 of this example includes a hollow body portion 35 and a reduced diameter portion 36 in which the tube diameter of the body portion 35 is reduced. The reduced diameter portion 36 is provided at a position continuous with the opening end 31e of the opening 31 of the rod-shaped body 30, and, for example, at the factory or construction site, the end of a straight steel pipe or a stepped steel pipe is replaced with a general-purpose steel pipe diameter reduced. It can be formed by reducing the diameter using an apparatus or the like. Hereinafter, in this embodiment, the rod-shaped body 30 having the reduced diameter portion 36 is referred to as a stepped steel pipe 30. The reduced diameter portion 36 corresponds to the recess 33 in which a portion 36 </ b> A continuous with the opening end 31 e on the outer peripheral surface 37 of the opening 31 is continuously recessed along the circumferential direction, and the recess 33 on the inner peripheral surface 32 of the opening 31. The portion has a convex portion 34 projecting continuously along the circumferential direction. That is, unlike the first embodiment, the convex portion 34 of the present example is formed at a position that is continuous (in contact with) the opening end 31 e of the opening 31. This joining structure 1 </ b> A further includes a tubular (ring-shaped) third member 40 disposed so as to cover the recess 33. An example of the third member 40 is a steel pipe having a pipe diameter and a pipe thickness that are substantially the same as the body portion 35 of the stepped steel pipe 30. The third member (steel pipe) 40 functions as a stiffening pipe (double steel pipe) 40 by being placed over the recess 33 of the stepped steel pipe 30. Hereinafter, the third member 40 is referred to as a stiffening tube 40. In addition, the 2nd member 20 of this example is the 2nd member 20 of the type from which the constriction part 23 shown to FIG. 5 (A) was abbreviate | omitted.

  When joining the stepped steel pipes 30 using the first member 10, the second member 20, and the stiffening pipe 40, first, the first member 10 is inserted into the opening 31 of one stepped steel pipe 30, The contact surface portion 11 is disposed so as to contact the inner peripheral surface 32 of the opening portion 31. Next, one male screw portion 22 of the second member 20 and the female screw portion 14 of the first member 10 are tightened. Thereby, due to the wedge effect of the pressing surface portion 21 of the second member 20, the contact surface portion 11 of the first member 10 presses the inner peripheral surface 32 of the opening portion 31, and the concave portion 12 of the contact surface portion 11 is the inner peripheral surface 32. It sticks in a state where it is hooked on the convex portion 34. Next, another first member 10 is inserted into the opening 31 of the other stepped steel pipe 30 and the stiffening pipe 40 is fitted so as to cover the recess 33 of the other stepped steel pipe 30. The other male screw portion 22 of the two member 20 and the female screw portion 14 of the other first member 10 are tightened. Thereby, the stepped steel pipes 30 can be joined to each other in a state where both the depressions 33 of the two stepped steel pipes 30 are covered with the stiffening pipe 40.

  According to this joining structure 1 </ b> A, the contact surface portion 11 of the first member 10 presses the inner peripheral surface 32 of the opening 31 due to the wedge effect of the pressing surface portion 21 of the second member 20, and the recess 12 of the contact surface portion 11. However, the stepped steel pipe 30 and the first member 10 can be firmly joined to each other. Therefore, as in the first embodiment, even when a force (compressive stress) in the direction in which the stepped steel pipe 30 and the first member 10 are brought close to each other or a force in the bending direction (bending stress) is applied, these stresses are applied. It is possible to improve the proof strength against. Furthermore, according to this joining structure 1A, since the tubular stiffening tube 40 is disposed so as to cover the recess 33 of the stepped steel tube 30, the force in the direction of separating the stepped steel tube 30 and the first member 10 ( Even when the tensile stress is applied, the first member 10 can be prevented from deforming (expanding diameter) the convex portion 34 of the stepped steel pipe 30. For this reason, the contact state in which the concave portion 12 of the contact surface portion 11 is caught by the convex portion 34 of the inner peripheral surface 32 can be maintained. Therefore, the yield strength against tensile stress can also be improved.

  Hereinafter, the third embodiment will be described. FIG. 8 is a view showing a joint structure according to the third embodiment. The joining structure 1 </ b> B according to the third embodiment includes a first member 10 and a second member 20. The rod-shaped body 30 of this example is a straight pipe (straight steel pipe) in which no convex portion is provided on the inner peripheral surface 32 of the opening 31. For this reason, unlike the first and second embodiments, the first member 10 of this example is not provided with a recess in the contact surface portion 11. In addition, the 2nd member 20 of this example is the 2nd member 20 of the type from which the constriction part 23 shown to FIG. 5 (A) was abbreviate | omitted. According to this joining structure 1B, the contact surface portion 11 of the first member 10 presses and closely contacts the inner peripheral surface 32 of the opening portion 31 due to the wedge effect of the pressing surface portion 21 of the second member 20, so that the straight steel pipe 30 and The first member 10 can be firmly joined. Therefore, the yield strength against compressive stress and bending stress can be improved.

1, 1A, 1B ··· Joining structure 10 · · First member 11 · · Contact surface portion · · · Recessed portion · · · · Pressed surface portion · · · · Female screw portion · · · 15 · Thin wall portion · · ·・ Flange part 20 ・ ・ Second member 21 ・ ・ Pressing surface part 22 ・ ・ Male thread part, first male thread part, second male thread part 23 ・ ・ Constriction part 24 ・ ・ Flat surface 25 ・ ・Buttock, 26 ・ ・ Flange,
27 ·· Pile tip 30 · · Rod-shaped body (stepped steel pipe, straight tube), 31 · · Opening portion, 31e · · Open end, 32 · · Inner peripheral surface, 33 · · · depression, 34 · · convex portion, 35..Body part, 36..Reduced diameter part,
36A ··· Consecutive parts, 37 · · Outer peripheral surface 40 · · Third member (stiffening tube)

Claims (11)

A joining structure for joining another member to a rod-like body having an opening at an end,
A first member disposed along an edge of the opening in a state in which the contact surface is in contact with the inner peripheral surface, the contact member having an abutting surface along the inner peripheral surface of the opening;
A second member having a pressing surface portion that is engaged with the first member and presses the first member in a direction in which the contact surface portion is in close contact with the inner peripheral surface,
A convex portion is provided on the inner peripheral surface of the opening,
The contact surface portion is provided with a recess along the protrusion.
Junction structure. The joining structure according to claim 1, wherein the first member is a member arranged at least two along an edge of the opening. The pressing surface portion has a tapered shape that decreases in diameter toward the distal end direction of the second member.
The joining structure according to claim 1 or 2. The second member has a constricted portion or a flange portion having at least a pair of flat surfaces parallel to each other at a position located outside the opening portion in a state of being engaged with the first member.
The joining structure according to any one of claims 1 to 3. The second member has a male screw portion formed toward the distal direction of the second member,
The first member has a female screw portion that is screwed to the male screw portion in a state of being arranged along an edge of the opening.
The joining structure according to any one of claims 1 to 4. The other member has an opening at an end, and is a second rod-shaped body that is separate from the first rod-shaped body that is the rod-shaped body,
The second member is a member that is engaged with each first member of the first rod-shaped body and the second rod-shaped body to join the first rod-shaped body and the second rod-shaped body, and is on the first rod-shaped body side. A first male screw portion that is the male screw portion provided on the second rod-like body, and a second male screw portion that is the male screw portion provided on the second rod-like body side,
The first male screw part has a thread opposite to the second male screw part,
The joining structure according to claim 5. The first member has a thin portion that suppresses interference with the convex portion when inserted into the opening.
The joining structure according to any one of claims 1 to 6. The first member has a flange portion along the end surface of the opening at the end of the rod-shaped body.
The joining structure according to any one of claims 1 to 7. The outer peripheral surface of the opening is provided with a recess in which a portion continuous with the opening end of the opening is recessed along the circumferential direction,
On the inner peripheral surface of the opening, the convex portion is provided with a portion corresponding to the depression protruding along the circumferential direction.
The joining structure according to any one of claims 1 to 8. The joint structure further includes a tubular third member arranged to cover the depression.
The joining structure according to claim 9. A joining structure for joining another member to a rod-like body having an opening at an end,
A first member disposed along an edge of the opening in a state in which the contact surface is in contact with the inner peripheral surface, the contact member having an abutting surface along the inner peripheral surface of the opening;
A second member having a pressing surface portion that is engaged with the first member and presses the first member in a direction in which the contact surface portion is in close contact with the inner peripheral surface,
The rod-shaped body is a straight pipe in which no convex portion is provided on the inner peripheral surface of the opening,
Junction structure.

Images