JP5342434B2 - Reinforcing bar joint structure - Google Patents

Description

  The present invention relates to a joint structure for reinforcing bars that connect, for example, reinforcing bars via a sleeve.

  Conventionally, as shown in FIG. 9, for example, as a means for connecting reinforcing bars arranged in concrete to each other in the longitudinal direction, reinforcing bars 501 having male screw portions 511 formed at the end portions are screwed together with the male screw portions. There are many rebar joint structures in which the male screw portion and the sleeve of the rebar are fastened and fixed by the locking nut 503 screwed into the cylindrical sleeve 502 formed with the female screw portion 521 and screwed into the male screw portion of the rebar. (For example, refer patent documents 1-5.).

Japanese Patent Application Laid-Open No. 11-071859 Japanese Patent Laid-Open No. 10-061107 Japanese Patent Application Laid-Open No. 08-239953 Japanese Patent Application Laid-Open No. 07-150688 JP 05-118142 A

  In the above-described prior art, the same female thread is formed on the sleeve and the locking nut so as to be screwed with the male thread formed at the end of the reinforcing bar. However, the means for forming the same female thread on the sleeve and the locking nut has a problem to be further improved.

  That is, at a construction site or the like, in order to quickly connect the reinforcing bars, it is desirable to increase the pitch between the male threaded portion provided at the end of the reinforcing bar and the female threaded portion of the sleeve screwed into the male threaded portion. In addition, since the coupling strength between the male screw portion provided on the reinforcing bar and the female screw portion provided on the sleeve increases as the screw size increases, the pitch of these screws also increases from this viewpoint. However, if the pitch of the male screw portion provided at the end of the reinforcing bar is large, the tightening torque of the locking nut that is screwed into the male screw portion having a large screw pitch will increase. Furthermore, since the locking nut is less likely to loosen as the pitch is smaller, it becomes easier to loosen when the pitch is large.

  Conversely, if the pitch of the male screw provided at the end of the reinforcing bar is reduced, the tightening torque of the locking nut can be reduced and difficult to loosen, but the work of screwing the reinforcing bar into the sleeve takes time and the screw size is reduced. The bond strength between the reinforcing bar and the sleeve is reduced.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a joint structure of reinforcing bars capable of quickly connecting reinforcing bars, improving the strength of connecting the reinforcing bars and the sleeve, and reducing the tightening torque of the locking nut.

  The inventor of the present application, as a result of diligent efforts, formed a square screw or a trapezoidal screw in the male screw portion provided at the end of the reinforcing bar, and further, this square screw or trapezoidal screw on the outer periphery of the square screw or trapezoidal screw. It has been found that the above-mentioned problems can be solved by forming a male screw having a smaller size and pitch than the screw and screwing the locking nut with a male screw having a smaller size and pitch.

  That is, the reinforcing bar joint structure according to the present invention includes a male threaded portion provided at an end of the reinforcing bar, a female threaded portion coupled to the male threaded portion, and a locking nut for tightening the male threaded portion and the female threaded portion. Is formed with a square screw or a trapezoidal screw, and a male screw having a smaller size and pitch than the square screw or the trapezoidal screw is formed on the outer periphery of the square screw or the trapezoidal screw. The female screw portion is formed with a square screw or a trapezoidal screw that is screwed with a square screw or a trapezoidal screw of the male screw portion. The locking nut is formed with a female screw that is screwed with a male screw formed on the outer periphery of the square screw or the trapezoidal screw of the male screw portion.

  A screw rebar may be used as the rebar, and a male screw having a smaller size and pitch than the screw of the screw rebar may be formed on the outer periphery of the end of the screw rebar as the male screw portion. That is, the joint structure of the reinforcing bar includes a male threaded portion provided at the end of the threaded reinforcing bar, a female threaded portion coupled to the male threaded portion, and a locking nut for tightening the male threaded portion and the female threaded portion. Has a male screw having a smaller size and pitch than the screw of the threaded reinforcing bar. The female screw portion is formed with a female screw that is screwed with the screw of the screw rebar, and the locking nut is formed with a female screw that is screwed with a male screw formed on the outer periphery of the screw of the screw rebar. .

  Further, a female screw portion made of a square screw or a trapezoidal screw may be provided at the end of the reinforcing bar, and a male screw having a size and a pitch smaller than that of the square screw or the trapezoidal screw may be formed on the male screw portion to be engaged with this. That is, the joint structure of the reinforcing bar includes a female screw part provided at an end of the reinforcing bar, a male screw part coupled to the female screw part, and a locking nut for fastening the female screw part and the male screw part. A square screw or a trapezoidal screw is formed. The male screw portion is formed with a square screw or a trapezoidal screw that is screwed with the female screw portion, and a male screw having a smaller size and pitch than the square screw or the trapezoidal screw is formed on the outer periphery of the square screw or the trapezoidal screw. The locking nut is formed with a female screw that is screwed with a male screw formed on the outer periphery of the square screw or the trapezoidal screw of the male screw portion.

  Here, the “reinforcing bar” is not limited to the deformed reinforcing bar that forms the bamboo knot, and may be a reinforcing bar that does not form the bamboo knot. “The male threaded part at the end of the reinforcing bar” refers to the case where a male thread is directly screwed to the end of the reinforcing bar, or another member with a male thread is joined to the end of the reinforcing bar by welding or friction welding. And a case where a male screw is screwed to the outer periphery of the sleeve joined to the end of the reinforcing bar by crimping or a screw structure. The term “internal thread” means a sleeve having an internal thread that can be screwed into an external thread provided at the end of a reinforcing bar, but it is reduced in diameter to the end of the other reinforcing bar in addition to a member independent of the reinforcing bar. A member such as a sleeve joined by compression or a screw structure is also included. Moreover, not only what couple | bonds two rebars but the thing of T shape or a cross shape etc. which couple | bond three or more rebars is also included.

  The “square screw or trapezoidal screw” of the male screw portion is not limited to the rolling process, but includes a case of cutting. Moreover, it includes not only a single thread but also a multi-thread with two or more threads. Furthermore, when connecting a pair of reinforcing bars via a female threaded portion such as a sleeve, the square screw or trapezoidal screw formed on each male threaded portion is formed with the screw directions opposite to each other (right screw and left screw), You may form the internal thread formed in internal thread parts, such as this sleeve, from the both ends of this sleeve toward the center, and the direction of a screw mutually reverses. Thus, if a reverse direction square screw or trapezoidal screw is formed, the joint structure can be used as a so-called turnbuckle.

  The “periphery of a square screw or trapezoidal screw” means an outer peripheral surface centered on the axis of the screw and the summit of the square screw or trapezoidal screw. The male screw formed on the outer periphery of the square screw or the trapezoidal screw is not limited to the case where the screw direction is the same as that of the square screw or the trapezoidal screw, and may be in the opposite direction.

  “Screw rebar” means that the outer periphery of the reinforcing bar is provided with a spiral protrusion, and the protrusion corresponds to a screw. In addition, although the cross-sectional shape of a protrusion corresponds to a rectangle, trapezoid, or circular arc shape, other cross-sectional shapes may be sufficient. “The outer periphery of the screw of the screw rebar” means the top of the ridge described above. That is, even if the cross-sectional shape of the ridge is an arc shape, a fine male screw can be screwed so as to scrape off the peak portion of the arc shape in parallel with the axis.

  The “internal thread portion provided at the end of the reinforcing bar” means a member having an internal thread formed on the end of the reinforcing bar, such as a sleeve that is reduced in diameter and coupled by compression or a screw structure. The “male thread portion” is not limited to a bolt member that is independent of the rebar, and couples a pair of rebars each provided with a female thread, but also includes a male thread portion formed at the end of the other rebar. In addition, as for what formed the external thread part in the end part of the other rebar, the external thread part is formed integrally with the end part of the other rebar, and the external thread part made of another member is rubbed to the end part of the other rebar. It includes those joined by pressure welding, welding, or the like, or those in which the sleeve is reduced in diameter to the end of the other reinforcing bar and joined by compression or a screw structure, and a male screw is formed on the outer periphery of the sleeve.

  By using a square screw or trapezoidal screw for the male thread part provided at the end of the reinforcing bar and the female thread part to be screwed to the male thread part, both can be quickly coupled and the coupling strength between the two is increased. Can do. Further, by forming a male screw having a smaller size and pitch than the square screw or trapezoidal screw on the outer periphery of the square screw or trapezoidal screw forming the male screw part, and using a locking nut that is screwed to the male screw, this locking screw is used. While tightening torque by a nut can be made small, this locking nut becomes difficult to loosen.

  If a screw of a screw rebar is used as a male screw, and a male screw having a smaller size and pitch than the screw is formed on the outer periphery of the screw of the screw rebar, the cost can be greatly reduced. Further, when high processing accuracy cannot be expected for the screw of the threaded reinforcing bar, the backlash between the threaded part of the threaded reinforcing bar and the sleeve to be screwed increases. However, as in the present invention, this looseness can be prevented with a small tightening torque by tightening both of them with a locking nut screwed into a male screw having a small size and pitch.

  Further, by providing a female screw portion made of a square screw or a trapezoidal screw at the end of the reinforcing bar, and forming a male screw having a smaller size and pitch than that of the square screw or the trapezoidal screw on the outer periphery of the male screw portion to be screwed thereto, The same effects as those obtained can be obtained.

It is a cross-sectional view of the joint structure of a reinforcing bar. It is the cross-sectional view and front view of the external thread part provided in the edge part of a deformed bar. It is the cross-sectional view and front view of a sleeve. It is the cross-sectional view and front view of a locking nut. It is a cross-sectional view of the joint structure of another reinforcing bar. It is a cross-sectional view of the joint structure of another reinforcing bar. It is a cross-sectional view of the joint structure of another reinforcing bar. It is a cross-sectional view of the joint structure of another reinforcing bar. It is a cross-sectional view of the joint structure of a reinforcing bar according to a conventional example.

  A reinforcing bar joint structure according to the present invention will be described with reference to FIGS. As shown in FIG. 1, the joint structure of a reinforcing bar according to the present invention includes a male thread part 11 provided at each end of a pair of deformed reinforcing bars 1, a female thread part 2 comprising a sleeve coupled to the male thread part, A locking nut 3 for tightening the male screw portion and the female screw portion is provided. As shown in FIG. 2, the male screw portion 11 is formed with a square screw 11a, and a male screw 11c having a smaller size and pitch than the square screw is formed on the outer periphery 11b of the square screw. The male screw portion 11 is joined to the end surface of the deformed reinforcing bar 1 by friction welding.

  As shown in FIG. 3, the female screw portion 2 formed of a sleeve is formed with a square screw 21 that is screwed into the square screw 11 a formed in the male screw portion 11 and penetrates the sleeve. The outer periphery of the sleeve 2 has both end portions 23 and 23 formed on the circumferential surface, and the central portion 22 is formed in a hexagonal cross-sectional shape so that it can be hooked with a wrench. As shown in FIG. 4, the locking nut 3 is formed with a female screw 31 that is screwed into the male screw 11 c having a small size and pitch formed in the male screw portion 11.

  Here, with reference to FIG. 1, the use of the reinforcing bar joint structure according to the present invention will be described. First, the locking nut 3 is screwed into the male screw 11c provided on the outer periphery of the male screw part 11 provided at the end of the pair of deformed reinforcing bars 1 and 1 respectively. Next, one end of the female screw portion 2 formed of a sleeve is screwed into the male screw portion 11 of one deformed reinforcing bar 1. Then, the male screw portion 11 of the other deformed reinforcing bar 1 is screwed into the other end of the female screw portion 2. Accordingly, the pair of deformed reinforcing bars 1, 1 and the female thread portion 2 formed of the sleeve can be quickly and firmly coupled by the square screws 11, 21 being screwed together. It should be noted that the installation interval can be easily adjusted by changing the length of the male threaded portion 11 of the pair of deformed reinforcing bars 1 screwed into the female threaded portion 2 formed of a sleeve.

  After adjusting the installation interval of the pair of deformed reinforcing bars 1, 1, both ends of the female thread portion 2 are tightened by the locking nut 3, and the pair of deformed reinforcing bars and the female thread portion are fixed. Since the locking nut 3 is screwed into the male screw 11c formed on the outer periphery 11b of the male screw portion 11 and having a small size and pitch, both ends of the sleeve 2 can be tightened with a small torque.

  5 to 8 show other embodiments, respectively. The parts or parts equivalent to those shown in FIG. 1 to FIG. 4 are given the same part numbers as the part numbers shown in FIG. 1 to FIG. In the rebar joint structure shown in FIG. 5, a threaded reinforcing bar 101 is used as the reinforcing bar, and a male threaded portion 111 is formed at the end of the threaded reinforcing bar. A male screw 111c having a size and a pitch smaller than that of the screw made of the ridge is screwed on the outer periphery of the screw 111a made of the ridge. That is, in the joint structure of the reinforcing bar, the screw 111a formed by the convex strip of the threaded reinforcing bar 101 is used as it is as a male screw having a large size and pitch as it is, and is screwed with the female screw 121 of the female screw part 102. Then, the locking nut 103 screwed on the male screw 111c having a small size and pitch screwed on the outer periphery of the screw 111a made of a ridge is tightened with each other and the backlash of both is eliminated.

  In the joint structure of the reinforcing bar shown in FIG. 6, a male threaded portion 211 is provided at the end of one deformed reinforcing bar 201 by reducing the diameter of one end of the sleeve and crimping it. A square screw 211a is formed on the outer periphery of the other end of the male screw portion 211, and a male screw 211c having a smaller size and pitch than the square screw is formed on the outer periphery of the square screw. At the end of the other deformed reinforcing bar 201, a female threaded portion 202 is provided in which one end of the sleeve is reduced in diameter and crimped. On the inner periphery of the other end of the female screw portion 202, a square screw 221 that is screwed with the square screw 211a is formed. Further, a locking nut 203 is screwed into the male screw 211c having a small size and pitch, and by this locking nut, the male screw portion 211 provided on one deformed reinforcing bar 201 and the female screw provided on the end of the other deformed reinforcing bar 201 are provided. The part 202 is fastened and fixed.

  In the reinforcing bar joint structure shown in FIG. 7, a female threaded portion 302 is provided at one end of the deformed reinforcing bar 301 by connecting one end of the sleeve with a reduced diameter. A square screw 321 made of a female screw is formed on the inner periphery of the other end of the female screw portion 302. A male screw portion 311 is coupled to the end of the other deformed reinforcing bar 301 by friction welding. In the male screw portion 311, a square screw 311 a that is screwed with the square screw 321 formed in the female screw portion 302 is formed, and a male screw 311 c that is smaller in size and pitch than the square screw is formed on the outer periphery of the square screw. Further, a locking nut 303 is screwed into the male screw 311c having a small size and pitch, and the female screw portion 302 provided at the end of one deformed reinforcing bar 201 and the end of the other deformed reinforcing bar 201 are engaged by this locking nut. The provided male screw member 311 is fastened and fixed.

  In the joint structure of the reinforcing bar shown in FIG. 8, an internal thread portion 402 is formed at each end of the pair of deformed reinforcing bars 401 by reducing the diameter of one end of the sleeve and connecting them, as shown in FIG. 7. On the inner periphery of the other end portion of the female screw portion 402, square screws 421 each formed of a female screw are formed. In addition, the male screw portion 411 that couples the pair of deformed reinforcing bars 401 to each other is formed with a square screw 411a formed of a male screw that is screwed with the square screw 421 of each female screw portion 402, and the outer periphery of the square screw The male screw 411c having a smaller size and pitch than the square screw is formed. Further, two locking nuts 403 are screwed into the male screw 411c having a small size and pitch, and the female screw portions 402 provided at the ends of the pair of deformed reinforcing bars 401 are fastened and fixed by the two locking nuts. To do.

  In addition, as shown in FIG. 8, when comparing the female thread portion 402 provided at the ends of the left and right deformed reinforcing bars 401, the square screw 421 provided on the inner periphery of the right female thread portion has a longer screw length. is there. In accordance with the difference in length between the left and right female screw portions 402, the male screw portion 411 also has a male screw on the right side longer than the left side with the incomplete screw portion 411d interposed therebetween. That is, when the interval between the left and right deformed reinforcing bars 401 is fixed, first, the long right-hand side portion of the male screw portion 411 is screwed into the long square screw 421 of the right-side female screw portion 402, and then the left-hand female screw portion 402 The short left side portion of the male screw member 411 is screwed into the short square screw 421 while rotating in the opposite direction.

  Reinforcing bars can be quickly coupled to each other, the coupling strength between the reinforcing bars and the sleeve can be improved, and the tightening torque of the locking nut can be reduced. Therefore, the present invention can be widely used in construction industries.

1, 201-501 Deformed bar (rebar)
101 Screw Rebar 11, 111-411 Male Threaded Part 11a, 111a-411a Square Screw (Square Screw or Trapezoidal Screw)
11b Outer periphery 11c, 111c to 411c Male screw 2, 102 to 402 Female screw part 21, 121 to 421 Square screw (square screw or trapezoidal screw)
3, 103-503 Locking nut

Claims (3)

A male screw portion provided at the end of the reinforcing bar, a female screw portion coupled to the male screw portion, and a locking nut for fastening the male screw portion and the female screw portion;
In the male screw portion, a square screw or a trapezoidal screw is formed, and a male screw having a smaller size and pitch than the square screw or the trapezoidal screw is formed on the outer periphery of the square screw or the trapezoidal screw.
The female screw part is formed with a square screw or a trapezoidal screw that is screwed with a square screw or a trapezoidal screw of the male screw part,
A rebar joint structure, wherein the locking nut is formed with a female screw that engages with a male screw formed on an outer periphery of a square screw or a trapezoidal screw of the male screw portion. A male screw part provided at the end of the threaded reinforcing bar, a female screw part coupled to the male screw part, and a locking nut for fastening the male screw part and the female screw part;
In the male screw portion, a male screw having a smaller size and pitch than the screw of the screw rebar is formed on the outer periphery of the screw of the screw rebar,
The female screw portion is formed with a female screw that is screwed with the screw of the screw rebar,
A rebar joint structure, wherein the locking nut is formed with a female screw that is screwed with a male screw formed on an outer periphery of the screw of the screw rebar. A female screw portion provided at the end of the reinforcing bar, a male screw portion coupled to the female screw portion, and a locking nut for fastening the female screw portion and the male screw portion;
The female screw part is formed with a square screw or a trapezoidal screw,
A square screw or a trapezoidal screw that engages with the female screw portion is formed on the outer periphery of the male screw portion, and a male screw having a smaller size and pitch than the square screw or the trapezoidal screw is formed on the outer periphery of the square screw or the trapezoidal screw. Formed,
A rebar joint structure, wherein the locking nut is formed with a female screw that engages with a male screw formed on an outer periphery of a square screw or a trapezoidal screw of the male screw portion.

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