JP5342871B2 - Reinforcing bar joint structure - Google Patents

Description

The present invention relates to a reinforcing bar joint structure.

As a rebar joint structure that connects rebars in the axial direction, it has a bar screw friction-welded to the end face of each rebar, a coupler screwed to both bar screws, and a pair of nut parts arranged so as to sandwich the coupler Reinforcing bar joint structures are known (see, for example, Patent Documents 1 and 2).
Registered Utility Model Publication No. 3012301 JP-A-9-302845

  In the above-mentioned reinforcing bar joint structure, it is necessary to screw three female screw parts (one coupler and two nut parts) to the bar screw attached to both reinforcing bars, and three female screws screwed to the bar screw. Since it is necessary to manually move the parts to a predetermined position, it takes time to connect the parts.

From this point of view, the present invention aims to provide a reinforcing bar joint structure capable of connecting reinforcing bars together simply and quickly.

The reinforcing bar joint structure according to the present invention for solving such a problem includes a first reinforcing bar and a second reinforcing bar to be connected, a first male screw part joined to an end face of the first reinforcing bar, and an end face of the second reinforcing bar. A second male screw part, a coupler connecting the first male screw part and the second male screw part, and a nut part for fastening the coupler, wherein the first male screw part Is composed of a bolt having a shaft portion and a head portion, and is joined to an end surface of the first rebar at the top surface of the head portion, and the second male screw component has a shaft portion and a head portion. A bolt, and joined to the end face of the second rebar at the top surface of the head, the coupler having a screw hole that is longer than the shaft portion of the first male screw part; and , Formed on the shaft part of the first male screw part External thread and is screwed into the male thread formed on the second male screw part that is, the length of the shaft portion of the second male screw part, the length of the nut part and the length of the coupler larger than the value obtained by adding the size, the nut part, together with being screwed to the external thread of said second externally threaded part in a state of being temporarily joined to said coupler by the dotted welding, the tightening of the nut component Due to the tightening torque, the temporarily joined state of the coupler and the nut part is released , and one end surface of the coupler is brought into contact with the seating surface of the head of the first male screw part, The end face is brought into contact with a seating surface of the nut part.

  In short, the present invention is characterized in that the first male screw part is a “bolt” and the head of the bolt is joined to the end face of the first reinforcing bar, and one end face of the coupler is connected to the head of the first male screw part. The second feature is that the nut part is brought into contact with the other end surface of the coupler. According to the present invention, the bolt head, which is the first male screw part, functions as a locking stopper that prevents rotation (loosening) of the coupler, so that nut parts conventionally required on both sides across the coupler are provided. Can be combined into one. In addition, according to the present invention, since the screwing length of the shaft portion of the bolt (first male screw part) to the coupler is constant, quality control during tightening (whether the screwing length satisfies the design rule) In such a case, it is only necessary to confirm the exposed length of the male screw of the second male screw component.

In the present invention, it is the second male screw part as a "bolt". In this way, since both the first male screw part and the second male screw part can be covered with commercially available products, material procurement becomes easy, and as a result, cost reduction can be achieved. When the second male screw component is a bolt, the top surface of the head is joined to the end surface of the second rebar.

  The reinforcing bar and the male screw part may be joined by welding, but more preferably by friction welding. That is, the top surface of the head of the first male screw component and the end surface of the first rebar are friction welded, and the top surface of the head of the second male screw component and the end surface of the second rebar are friction welded. It is preferable to do. If friction welding is used, the strength of the base material is less likely to be lower than in the case of other welding.

  By the way, when performing friction welding, in general, it is necessary to cause the chuck provided on the rotation main shaft of the friction welding apparatus to grip the part to be pressed, so when the male screw part is a bar screw, However, since the thread is formed over the entire length of the bar screw, a measure for preventing the thread from being crushed is required. On the other hand, when the male screw part is a bolt, a head without a thread can be gripped, so that a measure for preventing the thread from being crushed becomes unnecessary. In addition, when the bar screw is friction-welded to the reinforcing bar, the length of the bar screw after the friction welding changes depending on the force applied at the time of crimping, so the number of threads remaining after the friction welding may increase or decrease. However, when the bolt head is friction-welded to the reinforcing bar, even if the force applied during crimping changes, the length of the bolt shaft does not change, so it remains after friction welding. The number of threads can be made constant.

The nut part, our Ku is temporarily fixed to the coupler by the dotted welding. If it does in this way, since a coupler and a nut component can be moved (rotated) together, it will become possible to connect rebar simply and quickly. The joining strength between the coupler and the nut part is set to such a magnitude that the temporarily joined state between the coupler and the nut part is released by the tightening torque when the nut part is finally tightened.

  The first male screw part and the second male screw part are formed of a steel material having a tensile strength larger than that of the first reinforcing bar and the second reinforcing bar, and the shaft portion of the first male screw part and the second male screw part It is preferable that the thread diameter of the shaft portion is smaller than the nominal diameter of the first reinforcing bar and the second reinforcing bar. If it does in this way, since it becomes possible to make the outer diameter dimension (diagonal length dimension) of a coupler small, the filling property of the concrete around a reinforced joint structure becomes difficult to be impaired.

  According to the present invention, the reinforcing bars can be connected to each other simply by screwing two female screw parts (one coupler and one nut part), so that the reinforcing bars can be connected easily and quickly. Become.

  The reinforcing bar joint structure according to the embodiment of the present invention is classified as a mechanical reinforcing bar joint, and as shown in FIGS. 1A and 1B, the first reinforcing bar R1 and the second reinforcing bar to be connected. R2, a first male screw part 1 joined to the end face of the first rebar R1, a second male screw part 2 joined to the end face of the second rebar R2, a first male screw part 1 and a second male screw part 2 A coupler 3 to be connected and a nut part 4 for fastening the coupler 3 are provided.

  The first reinforcing bar R1 and the second reinforcing bar R2 are made of deformed steel bars (deformed reinforcing bars) of the same standard. The end of the first rebar R1 on the second rebar R2 side and the end of the second rebar R2 on the first rebar R1 side are arranged coaxially. In addition, although illustration is abbreviate | omitted, it does not interfere even if the specification (nominal diameter, material, etc.) of 1st rebar R1 and 2nd rebar R2 differs.

  The first male screw component 1 is composed of a bolt having a shaft portion 1A and a head portion 1B. The first male screw part 1 is friction-welded to the end surface of the first rebar R1 on the top surface 1t of the head 1B, and the central axis of the shaft portion 1A is located on the extension of the central axis of the first rebar R1. Yes. The first male screw component 1 of the present embodiment is composed of a hexagon full screw bolt. That is, a male screw is formed over the entire length of the shaft portion 1A, and the head portion 1B is formed in a hexagonal shape in plan view. Moreover, the diameter of the thread portion of the shaft portion 1A is smaller than the nominal diameter of the first reinforcing bar R1 and the second reinforcing bar R2.

  The second male screw component 2 includes a bolt having a shaft portion 2A and a head portion 2B. The second male screw part 2 is friction-welded to the end surface of the second rebar R2 on the top surface 2t of the head 2B, and the central axis of the shaft portion 2A is located on the extension of the central axis of the second rebar R2. Yes. Similar to the first male screw component 1, the second male screw component 2 of the present embodiment is composed of a hexagonal full screw bolt made of a steel material having a tensile strength greater than that of the first rebar R1 and the second rebar R2. The shaft portion 2A has the same thread diameter as the shaft portion 1A of the first male screw component 1, but the length of the shaft portion 2A is longer than that of the shaft portion 1A of the first male screw component 1. Yes. The diagonal length of the head 2 </ b> B is the same as that of the head 1 </ b> B of the first male screw part 1. In this embodiment, the length dimension of the shaft portion 2A is set to a value equal to or greater than the value obtained by adding the length dimension of the coupler 3 and the length dimension of the nut part 4.

  The first male screw part 1 and the second male screw part 2 are made of a steel material having a higher tensile strength than the first reinforcing bar R1 and the second reinforcing bar R2. In addition, when SD390 and SD490 reinforcing bars are used as the first reinforcing bar R1 and the second reinforcing bar R2, the first male screw part 1 and the second male screw part 2 are made of steel materials having a strength classification of 10.9T or 8.8T. Configure. In addition, there is no restriction | limiting in the material of the 1st male screw component 1 and the 2nd male screw component 2, For example, chromium molybdenum steel etc. other than plain steel (carbon steel) can be used.

  The coupler 3 includes a configuration that can be screwed into the male screw of the shaft portion 1A of the first male screw component 1 and the male screw of the shaft portion 2A of the second male screw component 2. It consists of a high nut that is longer than the shaft portion 1A of the male screw part 1. That is, the coupler 3 has a screw hole 3a (see FIG. 1A) longer than the shaft portion 1A of the first male screw component 1, and the shaft portion 1A of the first male screw component 1 and the second male screw component. It arrange | positions ranging over 2 axial part 2A. The screw hole 3a passes through the coupler 3, and a female screw is formed on the inner wall surface of the screw hole 3a.

  The nut part 4 has a configuration that can be screwed onto the male screw of the shaft portion 2 </ b> A of the second male screw part 2, and is disposed between the head 2 </ b> B of the second male screw part 2 and the coupler 3. The nut component 4 of the present embodiment is composed of a hexagonal nut having a threaded hole therethrough.

  Next, an example of the construction procedure (rebar connection procedure) of the reinforcing bar joint according to the present embodiment will be described.

(Bar arrangement process)
As shown in FIG. 2A, first, the first rebar R1 in a state where the first male screw component 1 is joined is arranged at a predetermined position.

  Next, as shown in FIG. 2B, the second rebar R2 in a state where the second male screw component 2 is joined is arranged at a predetermined position. When arranging the second rebar R2, the shaft portions 1A and 2A are coaxial with the tip surface of the shaft portion 2A of the second male screw component 2 facing the tip surface of the shaft portion 1A of the first male screw component 1. Adjust the position so that The front end surfaces of the shaft portions 1A and 2a may be opposed to each other with a gap equal to or less than the management reference value, or may be abutted without a gap. The coupler 3 and the nut part 4 are screwed into the shaft portion 2A of the second male screw part 2 before arranging the second rebar R2.

(Transfer process)
Thereafter, as shown in FIG. 2C, the coupler 3 is moved to the first male screw part 1 side, and one end surface (the left end face in FIG. 2) of the coupler 3 is moved to the head 1B of the first male screw part 1. It abuts on the seat surface 1s. Since the length dimension of the coupler 3 is larger than the shaft portion 1A of the first male screw part 1, when the coupler 3 is brought into contact with the head 1B of the first male screw part 1, the coupler 3 becomes the first male screw part. 1 and the shaft portion 2B of the second male screw part 2 are screwed together.

  If the coupler 3 is brought into contact with the head 1B of the first male screw part 1, the nut part 4 is moved to the first male screw part 1 side, and the seat surface 4s of the nut part 4 is moved to the other end face of the coupler 3. (A right end face in FIG. 2) Of course, the coupler 3 and the nut part 4 may be moved together.

(Tightening process)
Finally, when the nut part 4 is finally tightened (tightened) using a torque wrench (not shown) and the coupler 3 is tightened with the nut part 4, the rebar joint structure according to this embodiment is completed. Since the screwing length of the shaft portion 1A into the coupler 3 is constant, when performing quality control at the time of tightening (checking whether the screwing length satisfies the design rule), the second It is only necessary to confirm the exposed length of the male screw of the male screw component 2.

  According to the reinforcing bar joint structure according to the present embodiment described above, the head 1B of the bolt that is the first male screw component 1 functions as a loosening stopper that prevents the coupler 3 from rotating (loosening). Nut parts 4 required on both sides of the coupler 3 can be combined into one. That is, according to the reinforcing bar joint structure according to the present embodiment, two female screw parts (one coupler 3 and one nut part 4) are screwed with respect to the male screw of the first male screw part 1 and the male screw of the second male screw part 2. Since the first reinforcing bar R1 and the second reinforcing bar R2 can be connected only by combining them, it is possible to easily and quickly construct a reinforcing bar joint.

  In addition, since only one nut part 4 is tightened, only one worker can easily perform the work.

  Further, since the first male screw part 1 and the second male screw part 2 are constituted by bolts, it is possible to cover both the first male screw part and the second male screw part with commercially available products. If a commercially available product can be used, the procurement of materials becomes easy, and the cost can be reduced.

  Furthermore, since the head of the bolt is solid and integrated with the shaft portion, it has higher rigidity than a nut having a hollow central portion. That is, when the first male screw part 1 is a “bolt”, the height dimension of the head 1B can be made smaller than the height dimension of the nut, so that the nut parts 4 are arranged on both sides with the coupler 3 interposed therebetween. Compared to the above case, it is possible to shorten the overall length of the joint portion, and as a result, it is possible to obtain a reinforced joint structure that hardly impedes the filling properties of the concrete.

  In the present embodiment, the first male screw part 1 and the second male screw part 2 are joined to the first reinforcing bar R1 or the second reinforcing bar R2 by friction welding, respectively. The strength is difficult to decrease.

  In addition, when performing friction welding, the bolt which becomes the first male screw part 1 or the second male screw part 2 is gripped by the chuck of the friction welding apparatus, but the part gripped by the chuck is used as the head of the bolt. Thus, it can be firmly gripped, and a measure for preventing the shaft thread from being crushed is unnecessary. Also, if the bolt head is friction-welded to the first rebar R1 or the second rebar R2, the length of the bolt shaft does not change even if the force applied during crimping changes. The number of threads remaining after the pressure welding can be made constant. That is, if the first male screw part 1 and the second male screw part 2 are bolts, it is possible to provide a reinforcing bar joint structure with little dimensional error.

  Further, in the present embodiment, the first male screw part 1 and the second male screw part 2 are formed of a steel material having a tensile strength greater than that of the first reinforcing bar R1 and the second reinforcing bar R2, and accordingly, the first male screw part 1 Since the threaded portion diameters of the shaft portion 1A and the shaft portion 2A of the second male screw part 2 are made thinner than the nominal diameters of the first reinforcing bar R1 and the second reinforcing bar R2, the outer diameter dimension (diagonal length dimension) of the coupler 3 is reduced. ) Can be reduced. If the diagonal length dimension of the coupler 3 is reduced, the rebar joint structure is compactly accommodated, and therefore the concrete filling property around the rebar joint structure is not easily impaired.

  In addition, in this embodiment, although the case where the 1st male screw component 1 and the 2nd male screw component 2 were comprised with the hexagon bolt was illustrated, it is not the meaning which limits the shape of head 1B, 2B. Although illustration is omitted, any bolt having a head having a shape other than a hexagonal shape may be used, and a washer built-in bolt or a bolt with a flange may be used. Also, bolts other than those on the market can be used. In the present embodiment, the case where the coupler 3 and the nut part 4 are configured with a hexagonal high nut or a hexagonal nut is illustrated, but the form of these parts is not limited. Although illustration is omitted, any nut other than a hexagonal shape may be used, and a nut with a washer, a nut with a disc spring, a locking nut, or the like may be used. Of course, a nut other than a commercially available product may be used.

  Further, in the present embodiment, the case where both the first male screw part 1 and the second male screw part 2 are formed by full screw bolts is illustrated, but the second male screw part 2 is formed by half screw bolts or bar screws. There is no problem. In addition, when forming the 2nd external thread component 2 with a half screw bolt, it is desirable to use a half screw bolt of a trunk | drum type (for example, high tension bolt etc.). When the body type is used, the rigidity of the joint portion can be increased.

  Moreover, in this embodiment, although the case where the coupler 3 and the nut part 4 which screwed together with the axial part 2A of the 2nd external thread component 2 were moved separately was illustrated, as shown to (a) of FIG. It is also possible to temporarily fix the nut part 4 to the coupler 3 by means of welding and move the coupler 3 and the nut part 4 together to the first male screw part 1 side. If it does in this way, it will become possible to connect 1st rebar R1 and 2nd rebar R2 simply and quickly.

  It should be noted that the coupler 3 and the nut part 4 are bonded with a bonding strength that does not release the temporarily bonded state by temporary tightening. As shown in FIG. Tightening torque is applied to the nut component 4 until the temporarily joined state with the component 4 is released. That is, the strength of the temporary joining between the coupler 3 and the nut part 4 is such that the temporarily joined state between the coupler 3 and the nut part 4 is released by the tightening torque when the nut part 3 is finally tightened (tightened). It sets to a magnitude | size (a magnitude | size which the welding part W fractures | ruptures). In this case, as shown in FIG. 3B, the welded portion W is broken by the final tightening (tightening) on the nut part 3, and the welded portion W is displaced in the circumferential direction, so that the welded portion W is broken. Only by confirming this, the presence or absence of the final tightening (tightening) on the nut part 4 can be easily confirmed.

  When the nut part 4 is temporarily fixed to the coupler 3 by means of adhesion or the like, a mark is provided so as to straddle the boundary between the coupler 3 and the nut part 4, and the mark is displaced in the circumferential direction. By confirming the above, it is sufficient to confirm the presence or absence of the final tightening (tightening) on the nut part 4.

It is a figure which shows the reinforcing bar joint structure which concerns on embodiment of this invention, Comprising: (a) is the side view which fractured | ruptured one part, (b) is an exploded view. (A)-(c) is a side view for demonstrating the use procedure of the rebar joint structure which concerns on embodiment of this invention. (A) And (b) is a side view which shows the modification of the rebar joint structure which concerns on embodiment of this invention.

Explanation of symbols

R1 1st rebar R2 2nd rebar 1 1st male threaded part 1A Shaft 1B Head 1t Top face 1s Seat 2 Second male threaded part 2A Shaft 2B Head 2t Top 3 Coupler 3a Screw hole 4 Nut part 4s Seat

Claims (1)

The first and second rebars to be connected;
A first male threaded part joined to the end face of the first reinforcing bar;
A second male threaded part joined to the end face of the second reinforcing bar;
A coupler connecting the first male screw component and the second male screw component;
A nut part for fastening the coupler, and a reinforcing bar joint structure comprising:
The first male screw component is composed of a bolt having a shaft portion and a head, and is joined to an end surface of the first rebar at the top surface of the head,
The second male screw component is composed of a bolt having a shaft portion and a head, and is joined to the end surface of the second rebar at the top surface of the head.
The coupler has a screw hole longer than the shaft portion of the first male screw component, and is formed on the male screw and the second male screw component formed on the shaft portion of the first male screw component. Screwed into the male thread,
The length dimension of the shaft portion of the second male screw part is larger than a value obtained by adding the length dimension of the coupler and the length dimension of the nut part,
The nut part, together with being screwed to the external thread of said second externally threaded part in a state of being temporarily joined to said coupler by point with welding, by fastening torque at the time of the tightening of the nut part, and the coupler The temporarily joined state with the nut part is released,
One end surface of the coupler is brought into contact with the seating surface of the head of the first male screw component, and the seating surface of the nut component is brought into contact with the other end surface of the coupler.

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