JP6339375B2 - Joint and rebar connection method and connection structure - Google Patents

Description

  The present invention relates to a coupling method and a coupling structure for coupling a reinforcing bar coupling joint that couples two reinforcing bars and one of the two reinforcing bars, and in particular, friction coupling between the coupling and the one reinforcing bar. The present invention relates to a connecting method and a connecting structure.

  Generally, the joint for connecting reinforcing bars has a cylindrical shape, and an annular convex portion is formed on the inner peripheral surface thereof (see, for example, Patent Document 1). A joint in which a spiral female thread is formed on the inner peripheral surface instead of the annular convex portion is also known (see, for example, Patent Document 2). The rebar corresponding to the joint with the female thread is a so-called threaded rebar where the outer periphery is a spiral male thread. The male thread of the threaded steel rebar is screwed into the female thread of the joint.

The joint for connecting reinforcing bars described in Patent Document 3 has a cylindrical shape, and one end thereof is closed. The end surface of the reinforcing bar is joined to the outer end surface of the closed end portion by friction welding.
The joint for connecting reinforcing bars described in Patent Document 4 has a cylindrical shape, and a partition is provided inside thereof. The ends of the two reinforcing bars are inserted into the joint from both sides in the axial direction of the joint, and the joint is rotated while being pressed against the partition wall, whereby the ends of the reinforcing bars are joined to the joint by friction welding.

  As in Patent Documents 3 and 4, the joint connected to the reinforcing bar by friction welding has a dedicated structure, and it is difficult to divert the general joint illustrated in Patent Documents 1 and 2 as it is. is there. Therefore, it was necessary to prepare a joint with a dedicated structure, and the material cost was high.

Japanese Patent Laid-Open No. 08-218556 Japanese Patent Laid-Open No. 10-252223 JP 2011-006876 A Japanese Patent Laid-Open No. 08-240209

  In view of the above circumstances, an object of the present invention is to provide a connection method and a connection structure that can easily connect a reinforcing bar connecting joint and a reinforcing bar by friction welding. Preferably, it is another object of the present invention to provide a connection method and a connection structure capable of reducing material costs by making it possible to divert a joint having a general structure as a joint capable of friction welding with a reinforcing bar.

In order to solve the above-mentioned problems, the method of the present invention is a connecting method for connecting a cylindrical reinforcing bar connecting joint and a reinforcing bar, and an inner convex portion is formed on an inner peripheral surface of the reinforcing bar connecting joint, An outer convex portion that interferes with the inner convex portion is formed on the outer peripheral surface of the reinforcing bar, and the reinforcing bar is pushed into the reinforcing bar coupling joint while rotating the reinforcing bar coupling joint with respect to the reinforcing bar. The inner convex portion and the outer convex portion are friction-welded.
The structure of the present invention is a connecting structure of a tubular reinforcing bar connecting joint and a reinforcing bar, wherein an inner convex portion is formed on the inner peripheral surface of the reinforcing bar connecting joint, and an outer convex portion is formed on the outer peripheral surface of the reinforcing bar. The inner convex portion and the outer convex portion are joined to each other by friction welding.
As a result, the reinforcing bar connecting joint and the reinforcing bar can be easily connected.
Generally, since the convex part which comprises a cyclic | annular convex part and a female thread is formed in the inside of a coupling for reinforcing bar connection, this is made into the above-mentioned inner convex part, and it is for reinforcing bar connection of a general structure. The joint can be used for friction welding with the reinforcing bar. By doing so, material costs can be reduced.

The inner convex portion is preferably a female thread. In this case, it is possible to divert a normal screw-fushi reinforcing bar joint as the reinforcing bar connecting joint. Therefore, the material cost can be surely reduced.
Moreover, it is preferable that the said external convex part is an external thread. In this case, as a reinforcing bar connected to the joint for connecting reinforcing bars, a normal screw-type reinforcing bar can be used. Therefore, the material cost can be surely reduced.

In the connecting method, a partition-like upset receiving portion is provided inside the reinforcing bar connecting joint so as to be relatively rotatable with the reinforcing bar connecting joint with respect to the reinforcing bar, and an end of the reinforcing bar is connected to the upset receiving portion. The upset portion is formed by friction welding, and the outer peripheral portion of the upset portion bulges outward in the radial direction from the inner peripheral surface of the reinforcing bar connecting joint and is allowed to bite into the reinforcing bar connecting joint. preferable.
In the connection structure, a partition-like upset receiving portion is provided inside the reinforcing bar connecting joint, and between the end of the reinforcing bar and the upset receiving portion, the reinforcing bar and the upset receiving portion are provided. An upset portion formed by friction welding is formed, and an outer peripheral portion of the upset portion bulges radially outward from the inner peripheral surface of the reinforcing bar connecting joint and bites into the reinforcing bar connecting joint. It is preferable to constitute the protruding portion.
As a result, the pressed contact area of the reinforcing bar can be made larger than the frictional welding of only the inner convex part and the outer convex part, and the connection strength between the reinforcing bar connecting joint and the reinforcing bar can be increased. By causing the outer peripheral portion of the upset portion to bite into the reinforcing bar connecting joint, the connection strength can be further increased. Further, in the connection method, the reinforcing bar connecting joint and the reinforcing bar can be integrally joined by a single friction welding process.

In the connection method, a screw-fushi rebar end material shorter than the rebar connection joint is screwed into the rebar connection joint as an upset receiving portion, and the end of the rebar is rubbed against the screw-fushi rebar end material. It is preferable that the upset portion is formed by pressure contact, and that the outer peripheral portion of the upset portion bulges outward in the radial direction from the inner peripheral surface of the reinforcing bar connecting joint and bites into the reinforcing bar connecting joint. .
In the connection structure, a screw-fushi rebar end material shorter than the rebar-connection joint is screwed into the rebar connection joint as an upset receiving portion, and the end of the rebar and the screw-fushi rebar end material An upset part formed by joining these reinforcing bars and screw fistula reinforcing bar end members by friction welding is formed between the outer peripheral part of the upset part and the inner peripheral surface of the reinforcing bar connecting joint in the radial direction. It is preferable that the bulging part which bulges outside and bites into the reinforcing bar coupling joint is configured.
As a result, the pressed contact area of the reinforcing bar can be made larger than the frictional welding of only the inner convex part and the outer convex part, and the connection strength between the reinforcing bar connecting joint and the reinforcing bar can be increased. By causing the outer peripheral portion of the upset portion to bite into the reinforcing bar connecting joint, the connection strength can be further increased. Moreover, it is not necessary to prepare a special member as an upset receiving part by using the end material of a screw-fushi reinforcement as an upset receiving part. As a result, a general joint for threaded steel reinforcing bars can be used as the joint for connecting reinforcing bars. Therefore, an increase in material cost can be avoided. Furthermore, in the connection method, the reinforcing bar connecting joint and the reinforcing bar can be integrally joined by a single friction welding process.

  According to the present invention, it is possible to easily connect the reinforcing bar connecting joint and the reinforcing bar by friction welding.

FIG. 1 shows a first embodiment of the present invention and is a cross-sectional view of a main bar including a joint-rebar connection structure. FIG. 2 is a cross-sectional view showing the joints and the reinforcing bars constituting the connection structure in an exploded manner. FIG. 3 is a cross-sectional view showing a rotation / push-in process in the method for connecting the joint and the reinforcing bar. FIG. 4 is a cross-sectional view showing an upset process in the method of connecting the joint and the reinforcing bar.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a main reinforcement 1 of a reinforced concrete structure, for example. The main reinforcing bar 1 includes a reinforcing bar connecting joint 2 and reinforcing bars 3 and 4. Two reinforcing bars 3 and 4 are connected via a joint 2. Therefore, the main reinforcing bar 1 includes a connecting structure 1a between the reinforcing bar 3 and the joint 2 defined in the present invention.

  The reinforcing bar 3 (first reinforcing bar) is constituted by a screw-fushi reinforcing bar. Specifically, the reinforcing bar 3 has a reinforcing bar main part 11 and an outer convex part 12. An outer convex portion 12 protrudes from the outer peripheral surface of the reinforcing bar main portion 11. The outer convex portion 12 has a spiral shape and constitutes a male thread. Hereinafter, the outer convex portion 12 is also referred to as “male thread 12” as appropriate. Two flat portions 13 at 180 ° apart in the circumferential direction of the reinforcing bar 3 are formed. The flat convex portion 13 is not formed with the outer convex portion 12.

The 2nd reinforcement 4 is comprised by the screw rebar of the same kind (the same shape, the same dimension, and the same material) as the 1st reinforcement 3.
As will be described later, the second reinforcing bar 4 may be composed of a reinforcing bar having a shape, a dimension, a material, and the like different from those of the first reinforcing bar 3.

  The first reinforcing bar 3 and the second reinforcing bar 4 are arranged in a straight line, and the joint 2 straddles between the reinforcing bars 3 and 4. As shown in FIG. 2, the joint 2 includes a cylindrical peripheral wall 21 and an inner convex portion 22 formed on the inner peripheral surface of the cylindrical peripheral wall 21. The joint 2 is made of the same steel type (material) as the reinforcing bars 3 and 4, but may be made of a steel type (material) different from the reinforcing bars 3 or 4.

Here, the joint 2 is constituted by a joint for threaded steel reinforcing bars. That is, the inner convex portion 22 has a spiral shape along the inner peripheral surface of the joint 2 and forms a female thread. Hereinafter, the inner convex portion 22 is also referred to as “female screw thread 22” as appropriate. The female thread 22 can be screwed with the male thread 12. However, as will be described in detail later, the male thread 12 and the female thread 22 are integrated by friction welding instead of screwing. Therefore, the male screw thread 12 and the female screw thread 22 do not necessarily need to be screw threads that can be screwed to each other, and may have different pitches, lead angles, and the like and may not be screwable. The inner diameter _{D 22} of at least the female threads 22 may be smaller than the outer diameter _{D 12} of the male screw thread _{12 (D 22 <D 12)} . In other words, the distance from the central axis L ₀ of the main muscle 1 to the top of the inner convex portion 22 only needs to be smaller than the distance from the central axis L ₀ to the top of the outer convex portion 12. In short, as shown in FIG. 3 to FIG. 4, if the reinforcing bar 3 is not rotated with respect to the joint 2 or is rotated at a speed different from the advance amount at the time of screwing, The outer convex part 12 should just come to interfere.
As shown in FIG. 2, the valley diameter of the female thread 22, that is, the inner diameter D ₂₁ of the joint peripheral wall 21 is larger than the outer diameter D ₁₂ of the male thread 12 (D ₂₁ > D ₁₂ ). root diameter _{D 21} is good even less the outer diameter _{D 12} of the male screw thread _{12 (D 21 ≦ D 12)} .

An upset receiving portion 5 is provided in an intermediate portion (intermediate chamber 25) in the axial direction of the internal space of the tubular joint 2. The upset receiving part 5 has a partition shape. Upset receiving portion 5 of the thickness or axial length (dimension along the axis L ₀₎ is sufficiently smaller than the axial length of the joint 2. The upset receiving portion 5 has a thickness or a diameter (a dimension perpendicular to the axis L ₀ ) that is substantially the same as the inner diameter D ₂₁ of the joint peripheral wall ₂₁ or the inner diameter D ₂₂ of the female thread 22. By the upset receiving portion 5, the internal space of the joint 2 is partitioned into a first storage chamber 23 on one end side in the axial direction and a second storage chamber 24 on the other end side in the axial direction with the intermediate chamber 25 interposed therebetween. As shown in FIG. 1, the end of the first reinforcing bar 3 is inserted into the first storage chamber 23, and is joined and integrated with the joint 2 as described later. The end of the second reinforcing bar 4 is inserted into the second storage chamber 24 and is screwed into the joint 2.

As shown in FIG. 2, the upset receiving portion 5 is disposed so as to be biased toward the one end side of the joint 2. Therefore, the axial length _{L 23} of the first housing chamber 23 is shorter than the axial length _{L 24} of the second housing chamber _{24 (L 23 <L 24)} . However, the position of the upset receiving portion 5 in the present invention is not limited to the above. The upset receiving portion 5 may be disposed in the center portion of the joint 2, and the axial lengths L ₂₃ and L _{24 of} the first and second storage chambers ₂₃ and ₂₄ may be substantially equal to each other (L ₂₃ ≈L ₂₄ ). . On the contrary, the upset receiving portion 5 may be arranged so as to be biased to the other end portion of the joint 2, and the axial length L ₂₃ of the first storage chamber 23 is longer than the axial length L ₂₄ of the second storage chamber 24. (L ₂₃ > L ₂₄ ). Further, in FIG. 2, axial length _{L 23} of the first housing chamber 23 is shorter than the axial length _{L 25} of the intermediate chamber 25 (the axial length of the later friction welding before the upset receiving portion 5), these chambers 23 and 25 The axial lengths L ₂₃ and L ₂₅ may be substantially equal to each other (L ₂₃ ≈L ₂₅ ), and the axial length L ₂₃ of the first storage chamber 23 is equal to the axial length L 25 of the intermediate chamber ₂₅ (upset receiver before friction welding described later). The axial length of the part 5 may be longer.

Here, the upset receiving portion 5 is configured as a member different from the joint 2. Specifically, the upset receiving portion 5 is made of an end material of a screw-fushi reinforcing bar that is shorter than the joint 2 and has the same type (the same shape, the same size, and the same material) as the reinforcing bars 3 and 4. Hereinafter, the upset receiving portion 5 is also referred to as “screw-fushi reinforcing bar end material 5” as appropriate. The threaded reinforcing bar end material 5 is screwed into the intermediate chamber 25 of the joint 2.
As will be described later, the threaded reinforcing bar end material 5 may be composed of a reinforcing bar having a different shape, size, material, and the like from the reinforcing bar 3 or 4.

The reinforcing bar 3 and the joint 2 are integrally joined by the friction welding part 90. The friction welding part 90 includes a friction welding convex part 91 and an upset part 92.
More specifically, the friction welding convex portion 91 is formed between the outer periphery of the portion inserted into the first storage chamber 23 in the reinforcing bar main portion 11 and the inner periphery defining the first storage chamber 23 of the joint peripheral wall 21. Is provided. The friction welding convex portion 91 is formed by friction welding the outer convex portion 12 of the reinforcing bar 3 and the inner convex portion 22 of the joint 2. In the friction welding convex portion 91, the convex portions 12, 22 (that is, the male screw thread 12 and the female screw thread 22) are joined and integrated. As a result, the reinforcing bar main part 11 and the joint peripheral wall 21 are joined and integrated through the friction welding convex part 91.

  Further, an upset portion 92 is provided between the opposing end portions of the reinforcing bar 3 and the upset receiving portion 5 inside the joint 2. The upset portion 92 is formed by friction welding the reinforcing bar 3 and the upset receiving portion 5. In the upset portion 92, the reinforcing bar 3 and the upset receiving portion 5 are integrally joined so as to be compressed in the axial direction and expanded in the radial direction. The outer peripheral portion of the upset portion 92 forms an annular bulge portion 93. The bulging portion 93 bulges radially outward from the inner peripheral surface of the joint 2 (the inner peripheral surface of the peripheral wall 21 and the valley portion of the female thread 22) and bites into the joint peripheral wall 21. Further, the bulging portion 93 straddles the portion 92 a that is the reinforcing bar 3 and the portion 92 b that is the upset receiving portion 5 in the inner side of the bulging portion 93 of the upset portion 92. In the bulging portion 93, the joint 2, the reinforcing bar 3, and the upset receiving portion 5 are integrally joined.

As shown in FIGS. 1 and 2, the axial length L ₉₀ of the friction welding portion 90 (from the end face on the first rebar 3 side of the joint 2 to the boundary between the non-upset portion 5 b and the upset portion 92 in the upset receiving portion 5) Is shorter than the axial length L ₂₅ of the upset receiving portion 5 before friction welding (L ₉₀ <L ₂₅ ). Furthermore, the axial length _{L 90} of the friction welding unit 90 is shorter than the axial length _{L 5b} non upset portion _{5b (L 90 <L 5b <} L 25). However, the present invention is not limited to the above, and the axial length L ₉₀ of the friction welding portion 90 may be longer than the axial length L ₂₅ of the upset receiving portion 5 before the friction welding (L ₉₀ > L ₂₅ ). and hence the axial length _{L 90} of the friction welding unit 90 may be longer than the axial length _{L 5b} non upset portion _{5b (L 90> L 5b)} . Alternatively, the axial length _{L 90} of the friction welding unit 90 may be substantially equal to the axial length _{L 25} of the upset receiving portion 5 before friction welding _{(L 90} ≒ _{L 25),} or axial length of the friction welding unit 90 _{L 90} but it may be substantially equal to the axial length _{L 5b} non upset portion _{5b (L 90 ≒ L 5b)} .

A method of connecting the reinforcing bars 3 and 4 through the joint 2 will be described focusing on a method of connecting the reinforcing bar 3 and the joint 2.
As shown in FIG. 2, an upset receiving portion 5 is provided inside the joint 2. That is, the threaded reinforcing bar end material 5 is screwed into the intermediate chamber 25 of the joint 2.
Further, as shown in FIG. 3, the joint 2 is attached to the rotating portion 6 a of the friction welding device 6, and the reinforcing bar 3 is attached to the pressing portion 6 b of the friction welding device 6.
The stop member 7 is inserted into the second storage chamber 24. The end portion of the stop member 7 is abutted against or brought close to the upset receiving portion 5. Here, the stopper member 7 is composed of a screw-type reinforcing bar of the same type (same shape, same size, same material) as the reinforcing bars 3, 4, 5. The stop member 7 is screwed into the second storage chamber 24 of the joint 2. Preferably, by screwing of the stopper member 7, the male screw thread of the threaded reinforcing bar end material 5 strongly hits the female screw thread 22 of the joint 2 from the left side in FIG. 3, and the male screw thread of the stopper member 7 is The female thread 22 is strongly hit from the right side in FIG. As a result, the upset receiving portion 5 can be fixed to the joint 2.

  The joint 2 is rotated at a high speed with respect to the reinforcing bar 3 by the rotating part 6a, and the reinforcing bar 3 is pushed into the first housing chamber 23 of the joint 2 at a low speed by the pressing part 6b. Therefore, the rotation speed of the joint 2 relative to the reinforcing bar 3 is assumed to be a virtual speed of the joint 2 when the male thread 12 and the female thread 22 are screwed together at an advance speed corresponding to the speed at which the reinforcing bar 3 is pushed into the joint 2. It is much larger than the rotation speed. For this reason, the external thread 12 at the end of the reinforcing bar 3 and the internal thread 22 in the first storage chamber 23 interfere and rub against each other without screwing together. These threads 12 and 22 generate heat and are softened or dissolved.

  As shown in FIG. 4, the reinforcing bars 3 can be pushed deeply into the first storage chamber 23 by softening or melting the threads 12 and 22. Accordingly, the threads 12 and 22 are joined together while being deformed.

  Eventually, the end of the reinforcing bar 3 reaches the upset receiving part 5. Here, the upset receiving portion 5 rotates at high speed together with the joint 2 with respect to the reinforcing bar 3. Therefore, the end portion of the reinforcing bar 3 and the end portion of the upset receiving portion 5 are rubbed against each other, and generate heat and are softened or dissolved. At this time, the upset receiving portion 5 can be reliably rotated together with the joint 2 by the stop member 7 and the upset receiving portion 5 can be prevented from coming off.

  Further, while the joint 2 and the upset receiving portion 5 are rotated at a high speed, the reinforcing bar 3 is strongly pressed against the upset receiving portion 5 by the pressing portion 6b, thereby compressing in the axial direction and expanding in the radial direction. When the bulging in the radial direction reaches the joint peripheral wall 21, the end of the reinforcing bar 3 and the joint peripheral wall 21 rub against each other, and the portion facing the end of the rebar 3 in the inner peripheral part of the joint peripheral wall 21 generates heat. And softened or dissolved.

  Thereafter, the rotation of the joint 2 and the upset receiving portion 5 by the rotating portion 6a is stopped. On the other hand, the reinforcing bar 3 is continuously strongly pressed against the upset receiving part 5 by the pressing part 6b. Thereby, the end portion of the reinforcing bar 3 is further compressed in the axial direction and further bulged in the radial direction. As a result, the reinforcing bar 3, the upset receiving portion 5, and the joint 2 are integrated with each other by friction welding.

Specifically, the friction welding portion 91 is formed by joining the female thread 22 of the first housing chamber 23 of the joint 2 and the male thread 12 of the reinforcing bar 3 in the first housing chamber 23 by friction welding. Is formed.
Moreover, the upset part 92 is formed between these reinforcing bars 3 and the upset receiving part 5 by joining the edge part of the reinforcing bar 3 and the end part of the upset receiving part 5 by friction welding. The reinforcing bar 3 and the upset receiving portion 5 are integrally joined via the upset portion 92.
Further, the upset portion 92 bulges in the radial direction, whereby a bulge portion 93 is formed. The joint 2 and the reinforcing bar 3 are directly and integrally joined via the bulging portion 93.

  Thus, after connecting the reinforcing bar 3, the joint 2, and the upset receiving part 5 via the friction welding part 90, the reinforcing bar 3 and the joint 2 are removed from the friction welding apparatus 6. Further, the rebar 7 is removed from the second storage chamber 24. Then, as shown in FIG. 1, the second reinforcing bar 4 is screwed into the second storage chamber 24. Thereby, the reinforcing bar 3 and the second reinforcing bar 4 can be connected via the joint 2.

According to the connection structure 1a, the reinforcing bar 3 and the joint 2 can be easily and integrally connected by a single friction welding operation.
In addition, by configuring the inner convex portion 22 with a female screw thread, a general screw-fushi reinforcing bar coupling joint can be used as the joint 2. Further, as the reinforcing bar 3, a general screw-fushi reinforcing bar that can be screwed into the joint for connecting a screw-fushi reinforcing bar can be used, and a general screw-fushi reinforcing bar that cannot be screwed to the joint for connecting a screw-fushi reinforcing bar can be used. Furthermore, as the upset receiving portion 5, an end material of a general screw-fushi rebar that is screwed into the joint for connecting a screw-fushi rebar can be used. Thereby, the material cost can be reduced.
According to the connecting structure 1a, in addition to the reinforcing bar 3 and the joint 2 being joined by the friction welding convex part 91, the reinforcing bar 3 and the upset receiving part 5 can be integrally joined by the upset part 92. Since the bulging part 93 of the upset part 92 bites into the joint surrounding wall 21, the rebar 3 and the joint 2 can be directly integrally joined. Thereby, a strong connection structure can be obtained. Particularly, since the reinforcing bar 3 is hooked on the joint peripheral wall 21 via the bulging portion 93, the connection strength can be sufficiently increased.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, the 1st reinforcing bar 3 and the 2nd reinforcing bar 4 may be comprised by the screw-fushi reinforcing bar of a mutually different shape (size, screw pitch, etc. differ). In addition, the inner surface shape (inner diameter D ₂₁ , D ₂₂ , pitch of female thread 22, etc.) of the first storage chamber 23 of the joint 2 and the inner surface shape (inner diameter D ₂₁ , D ₂₂ , The pitch of the female thread 22 or the like) may be different from each other. In this case, the inner surface shape of the first storage chamber 23 preferably corresponds to the first rebar 3, and the inner surface shape of the second storage chamber 24 preferably corresponds to the second rebar 4. Further, the screw-fushi reinforcing bar end material 5 may be a screw-fushi reinforcing bar having the same shape as the first reinforcing bar 3 and different in shape from the second reinforcing bar 4, and the same shape as the second reinforcing bar 4 and different in shape from the first reinforcing bar 3. The screw-fushi rebar may be used. When the threaded reinforcing bar end material 5 is a threaded reinforcing bar having the same shape as the first reinforcing bar 3 and a different shape from the second reinforcing bar 4, the inner surface shape of the intermediate chamber 25 of the joint 2 is continuous with the inner surface shape of the first containing chamber 23. And it is preferable that it is discontinuous with the inner surface shape of the second storage chamber 24, and when the threaded reinforcing bar end material 5 is a threaded reinforcing bar having the same shape as the second reinforcing bar 4 and a different shape from the first reinforcing bar 3, the joint 2 The inner surface shape of the intermediate chamber 25 is preferably continuous with the inner surface shape of the second storage chamber 24 and discontinuous with the inner surface shape of the first storage chamber 23.
Furthermore, the shape of the threaded reinforcing bar end material 5 may be different from that of the first reinforcing bar 3 and the second reinforcing bar. For example, the outer diameter of the threaded reinforcing bar end material 5 may be an intermediate size between the outer diameter of the first reinforcing bar 3 and the outer diameter of the second reinforcing bar 4. Correspondingly, the inner surface shape of the intermediate chamber 25 of the joint 2 may be different from that of the first storage chamber 23 and the second storage chamber 24. For example, the inner diameter D ₂₁ of the intermediate chamber 25 may be an intermediate size between the inner diameter D ₂₁ of the first storage chamber 23 and the inner diameter D ₂₁ of the second storage chamber 24.
A step may be formed between the first storage chamber 23 or the second storage chamber 24 and the intermediate chamber 25. The upset receiving portion 5 may be pressed against the step.

The outer convex portion 12 is not necessarily limited to a male thread, that is, a spiral convex portion, and may be an annular shape along the circumferential direction of the reinforcing bar, a linear shape along the axis of the joint 2, or a dotted shape. The reinforcing bar 3 may be formed of a normal deformed reinforcing bar having a vertical rib and a horizontal flange as an outer convex portion.
You may friction-weld the internal convex part 22 which consists of the internal thread of the coupling 2, and the vertical rib and horizontal fushi of the said normal deformed reinforcing bar.
The inner convex portion 22 is not necessarily limited to a female thread, that is, a spiral convex portion, and may be an annular shape along the circumferential direction of the joint, a linear shape along the axis of the joint 2, or a dot shape.
The inner convex portion 22 that is friction-welded with the outer convex portion 12 of the reinforcing bar 3 only needs to be formed on at least the inner peripheral surface of the first storage chamber 23 in the joint 2.

As the upset receiving part 5, it is not always necessary to use the end material of a screw-fushi reinforcing bar, and the end member of a normal deformed reinforcing bar having a vertical rib and a horizontal fist may be used. A columnar member may be used. In this case, the outer diameter of the upset receiving portion 5 is preferably slightly smaller than the inner diameter D ₂₂ of the joint 2. Moreover, as the stop member 7, the normal deformed reinforcing bar which has a vertical rib and a horizontal fist may be used, and the rod-shaped member or cylindrical member which does not have a convex part on the outer periphery may be used. In this case, the outer diameter of the stop member 7 is preferably smaller than the inner diameter D ₂₂ of the joint 2. Further, in this case, it is preferable that a fitting portion such as a protrusion or a screw is provided at an end of the stopper member 7 on the upset receiving portion 5 side, and this fitting portion is detachably fitted to the upset receiving portion 5. And when rotating the joint 2 with respect to the reinforcing bar 3 at the time of friction welding, it is preferable to rotate the upset receiving portion 5 at the same speed as the joint 2 by rotating the stopper member 7 at the same speed as the joint 2. .
The upset receiving part 5 may be a partition wall integral with the joint 2. In this case, the stop member 7 is not required for friction welding.

The upset receiving portion 5 may be omitted, and as a result, the upset portion 92 may be omitted. The friction welding part 90 includes only the friction welding convex part 91 and may not include the upset part 92.
Alternatively, the inner convex portion 22 or the outer convex portion 12 may be omitted, the inner convex portion 22 and the outer convex portion 12 may not interfere with each other, or the friction welding convex portion 91 may be omitted. The friction welding portion 90 includes only the upset portion 92 and does not need to include the friction welding convex portion 91.

  At the time of friction welding, the joint 2 and the reinforcing bar 3 may be rotated relative to each other, and the rotating part 6 a may be connected to the reinforcing bar 3 to rotate the reinforcing bar 3.

  The present invention can be applied to, for example, main bars of reinforced concrete structures.

1a Connecting structure 2 Joint 3 Reinforcing bar 5 Thread fushi rebar end material (upset receiving part)
12 outer convex part 22 inner convex part 90 friction welding part 91 friction welding convex part 92 upset part 93 bulging part

Claims (6)

A connecting method for connecting a tubular reinforcing bar connecting joint and a reinforcing bar,
An inner convex portion is formed on the inner peripheral surface of the reinforcing bar coupling joint, and an outer convex portion that interferes with the inner convex portion is formed on the outer peripheral surface of the reinforcing bar,
While rotating the reinforcing bar coupling joint with respect to the reinforcing bar, by pressing the reinforcing bar into the reinforcing bar coupling joint, the inner convex portion and the outer convex portion are friction welded ,
Moreover, a partition-like upset receiving portion is provided inside the reinforcing bar coupling joint so as to be relatively rotatable with the reinforcing bar coupling joint with respect to the reinforcing bar,
An upset portion is formed by friction-welding the end of the reinforcing bar to the upset receiving portion, and the outer peripheral portion of the upset portion is bulged radially outward from the inner peripheral surface of the reinforcing bar coupling joint. A method for connecting a joint and a reinforcing bar, wherein the joint for reinforcing bar connection is bitten.   The connection method according to claim 1, wherein the inner convex portion is a female screw thread. A connecting method for connecting a tubular reinforcing bar connecting joint and a reinforcing bar,
An inner convex portion is formed on the inner peripheral surface of the reinforcing bar coupling joint, and an outer convex portion that interferes with the inner convex portion is formed on the outer peripheral surface of the reinforcing bar,
While rotating the reinforcing bar coupling joint with respect to the reinforcing bar, by pressing the reinforcing bar into the reinforcing bar coupling joint, the inner convex portion and the outer convex portion are friction welded,
The inner convex part is a female thread;
In addition, inside the rebar coupling joint, as an upset receiving portion, a screw-fushi rebar end material shorter than the rebar coupling joint is screwed,
An upset portion is formed by friction-welding the end portion of the reinforcing bar to the screw-fushi reinforcing bar end material, and the outer peripheral portion of the upset portion is bulged radially outward from the inner peripheral surface of the reinforcing bar coupling joint. And a coupling method of the joint and the reinforcing bar, wherein the joint is made to bite into the joint for coupling the reinforcing bar. It is a connecting structure between a tubular reinforcing bar connecting joint and a reinforcing bar,
An inner convex portion is formed on the inner peripheral surface of the reinforcing bar coupling joint, and an outer convex portion is formed on the outer peripheral surface of the reinforcing bar,
The inner convex portion and the outer convex portion are joined to each other by friction welding ,
A partition-like upset receiving portion is provided inside the reinforcing bar coupling joint, and the reinforcing bar and the upset receiving portion are joined by friction welding between the end of the reinforcing bar and the upset receiving portion. An upset portion is formed, and an outer peripheral portion of the upset portion forms a bulging portion that bulges radially outward from the inner peripheral surface of the reinforcing bar connecting joint and bites into the reinforcing bar connecting joint. connection structure of the joint and rebar, characterized in that is. The connection structure according to claim 4 , wherein the inner convex portion is a female screw thread. It is a connecting structure between a tubular reinforcing bar connecting joint and a reinforcing bar,
An inner convex portion is formed on the inner peripheral surface of the reinforcing bar coupling joint, and an outer convex portion is formed on the outer peripheral surface of the reinforcing bar,
The inner convex portion and the outer convex portion are joined to each other by friction welding,
The inner convex part is a female thread;
Inside the rebar coupling joint, as an upset receiving part, a screw fushi rebar end material shorter than the rebar coupling joint is screwed, and between the end of the rebar and the screw fist rebar end material, An upset portion is formed by joining the reinforcing bar and the screw-fushi reinforcing bar end material by friction welding, and the outer peripheral portion of the upset portion bulges radially outward from the inner peripheral surface of the reinforcing bar coupling joint. A joint-rebar connection structure comprising a bulging portion that bites into the rebar connection joint.

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