KR102504839B1 - One-touch rebar coupler with integral body - Google Patents

Abstract

A one-touch iron reinforcing bar coupler with an integrated coupler body according to the present invention comprises: an integrated coupler body having a hollow part formed therein, made of carbon steel and having a first and a second tapered part having a pipe reduced so that the pipe can be gradually expanded from both insertion hole sides, into which an iron reinforcing bar is inserted; a first tightening unit including first tightening members inserted into the first tapered part of the hollow part; a second tightening unit including second tightening members inserted into the second tapered part of the hollow part; an elastic member installed between the first and the second tightening unit to elastically bias the first and the second tightening members of the first and the second tightening unit to the first and the second tapered part, respectively; a first flexible part having the rigidity of the first tapered part having the pipe of the integrated coupler body reduced; at least one first rigid part more rigid than the first flexible part in a circumferential direction; a second flexible part having the rigidity of the second tapered part having the pipe of the integrated coupler body reduced; and at least one second rigid part more rigid than the second flexible part in a circumferential direction. Therefore, provided is a one-touch iron reinforcing bar coupler with an integrated coupler body, wherein damage to tapered parts of the coupler body can be prevented when a tensile force is applied to an iron reinforcing bar and the initial slip of combined iron reinforcing bars can be reduced.

Description

One-touch rebar coupler with integral body

The present invention relates to a one-touch reinforcing bar coupler, and more particularly, to a one-touch reinforcing bar coupler having an integrated coupler body with improved strength of the integrated coupler body for connecting reinforcing bars during construction of a concrete structure.

In general, when constructing buildings and manufacturing concrete structures for various civil works, reinforcement work is performed. As the reinforcing bars for this purpose are manufactured in standardized lengths, the reinforcement work is accompanied by the work of interconnecting the reinforcing bars of a predetermined length. .

A coupler for connecting reinforcing bars during reinforcement work is posted in Korean Patent Registration No. 101768816, and a one-touch reinforcing bar coupler is posted in Korean Patent Registration No. 101654150.

Korean Patent Publication No. 2019-0002186 discloses a rebar coupler integrally formed with a coupler body, and Korean Utility Model Publication No. 2021-000573 discloses a one-touch rebar coupler.

The posted body integrally formed reinforcing bar coupler includes a coupler body including a hollow part into which a reinforcing bar can be inserted and a nut part for fixing the reinforcing bar inserted into the coupler body, and the coupler body includes a main body part and one side of the main body part. A first extension portion extending to and a second extension portion extending to the other side of the body portion, wherein the coupler body has a first cutout portion continuously formed from the first extension portion to the second extension portion through the body portion. include

The reinforcing bar coupler of this structure has a structure in which the body is integrally formed, but is cut in the longitudinal direction and coupled to the nut portion, so the bonding force of the reinforcing bars cannot be increased. In addition, since it has a structure in which the body grips the reinforcing bars, there is a limit to reducing the initial slip amount.

The reinforcing bar coupler published in Korean Publication No. 2021-0128953 has a housing with a hollow interior and first and second insertion holes for inserting reinforcing bars on both sides, respectively, and the housing is an integrated body made of metal. It has a structure in which the inner diameter monotonically decreases while going toward the first and second insertion ports.

The housing of the reinforcing bar coupler receives force in a direction in which the constricted portion is expanded by fixing members for fixing the reinforcing bars when tensile force is applied in the longitudinal direction in a state in which the reinforcing bars are coupled. Therefore, there is a problem that the shaft tube portion of the housing is plastically deformed or the shaft tube portion is damaged, and there is a problem that the initial slip amount of the reinforcing bars with respect to the housing is increased.

Republic of Korea Patent No. 10-2123538 Korea Utility Model Registration No. 20-0192465 Republic of Korea Patent Publication No. 2019-0002186, Republic of Korea Patent Registration No. 10-0880117 Republic of Korea Publication No. 2021-0128953

The present invention is to solve the above-described problems, to prevent the tapered portion of the coupler body from being damaged when tensile force is applied to the reinforcing bar by strengthening the strength of the tapered portion of the integrally formed coupler body, and to reduce the initial slip amount of the coupled reinforcing bar It is to provide a one-touch rebar coupler having an integral coupler body that can reduce

Another object of the present invention is to provide an integrated coupler body with increased gripping power of a tightening member that grips reinforcing bars by having a soft part having strength inherent in the material and a rigid part relatively stronger than the soft part in the tapered part on both sides of the integrally formed coupler body. It is to provide a one-touch rebar coupler with

The one-touch reinforcing bar coupler having an integrated coupler body of the present invention for solving the above technical problem is

An integrated coupler body made of carbon steel and having a hollow part having first and second taper parts formed of shaft tubes so as to gradually expand from the side of the insertion hole on both sides into which the reinforcing bar is inserted, and a first clamping member inserted into the first tapered part side of the hollow part It is installed between a first tightening unit having a first tightening unit, a second tightening unit having second tightening members inserted into the second tapered portion side of the hollow part, and the first and second tightening units, and the first and second tightening units. An elastic member is provided for elastically biasing the first and second tightening members of the tightening unit to the first and second tapered portions, respectively.

A first flexible portion having a strength of a first tapered portion formed of a shaft tube of the integral coupler body, and at least one first rigid portion that is relatively stronger than the first flexible portion in a circumferential direction,

It is characterized in that a second flexible part having the strength of the second tapered part formed of the shaft tube of the integral coupler body and at least one second rigid part that is relatively stronger than the second flexible part in the circumferential direction are provided.

In the present invention, the first and second rigid parts are formed on outer circumferential surfaces corresponding to the first and second tightening members inserted into the first and second tapered parts, respectively, and the first and second flexible parts are formed on the first and second tapered parts. It is formed at the end side of each part.

The first and second rigid parts respectively formed in the first and second tapered parts are formed on the skin layer in the thickness direction by heat-treating the outer circumferential surface of the first and second taper parts by induction heating means.

In the one-touch reinforcing bar coupler having an integral coupler body according to the present invention, since the coupler body is made of a single member, it is possible to fundamentally prevent the coupling portion from being weakened by combining two conventional members.

In addition, it is possible to prevent the coupler body from being deformed or damaged by tensile force acting in a direction in which the coupled reinforcing bars are separated, and in particular, the amount of slip generated while the integrally formed coupler body is stretched can be minimized. In addition, in constructing a concrete structure, the coupler body according to the present invention is prevented from increasing in diameter to supplement the strength of the coupler body, so it is possible to prevent a decrease in the amount of concrete poured at the reinforcing bar connection portion by the coupler.

1 is a partially cut away perspective view of a one-touch rebar coupler having an integrated coupler body according to the present invention;
Figure 2 is a partially cut-away perspective view showing the integrated coupler body shown in Figure 1;
3 and 4 are cross-sectional views showing other embodiments of the integrated coupler body according to the present invention, respectively.
5 is a cross-sectional view showing a state in which reinforcing bars are coupled to a one-touch reinforcing bar coupler having an integrated coupler body shown in FIG. 1;

Embodiments of a one-touch rebar coupler having an integral coupler body according to the present invention are shown in FIGS. 1 to 5.

Referring to the drawings, the one-touch reinforcing bar coupler 10 having an integrated coupler body according to the present invention is for interconnecting reinforcing bars during the construction of civil engineering or concrete buildings, and the first and second reinforcing bars 110 to be connected ( 120) are inserted into the first and second insertion holes 21a and 22a on both sides, and the first and second taper portions 21 that gradually expand toward the center from the side of the first and second insertion holes 21a and 22a (22) and an integrated coupler body (20) having a hollow part (24) extending in the longitudinal direction. In addition, in parts other than the first and second rigid parts 75 and 76 respectively formed in the parts corresponding to the first and second taper parts 21 and 22 of the integrated coupler body 20 and the 12th taper part At least one first and second flexible part 71 and 72 are respectively formed. The first flexible parts 71 and 72 may have the strength of the material constituting the coupler body 20, and the first and second rigid parts 75 and 76 are made of a material that is relatively stronger than the flexible part. It can be.

In addition, the one-touch reinforcing bar coupler according to the present invention is inserted into the hollow part 24 of the coupler body 20 and is in close contact with the inner circumferential surface of the first tapered part 21, and the first tightening unit grips the first reinforcing bar 110. (30) and the second tightening unit (40) inserted into the hollow part (24) of the coupler body (20), in close contact with the inner circumferential surface of the second tapered part (22) and gripping the second reinforcing bar (120). provide In addition, between the first and second tightening units 30 and 40, the first and second tightening members of the first tightening unit 30 and the second tightening unit 40 are inserted into the first and second insertion holes 21a. An elastic member 50 for elastically biasing toward (22a) is installed.

The one-touch reinforcing bar coupler 10 having an integral coupler body according to the present invention configured as described above will be described in more detail for each component as follows.

The coupler body 20 of the rebar coupler 10 according to the present invention is a member having a hollow part 24 passing through the center in the longitudinal direction, and the above-described first and second tightening units 30 and 40 and the elastic member (50) is inserted, and both sides thereof are compressed to form first and second tapered portions 21 and 22. The first and second tapered portions 21 and 22 have a structure in which both inner and outer surfaces are tapered. The inner circumferential surfaces of the first and second tapered portions 21 and 22 have a tapered structure at substantially the same angle as the outer circumferential surfaces of the first and second tightening units 30 and 40, respectively.

The material of the coupler body 20 is made of carbon steel, and it is preferable to use carbon steel such as S45C, SCM440, and SCM450 of the KS standard. However, it is not limited thereto.

Meanwhile, the first and second rigid parts 75 and 76 formed on the first and second taper parts 21 and 22 of the coupler body 20 as described above are the outer circumferential surfaces of the first tightening unit 30 and 40 In the state in which the first and second tightening members 31 and 41 to be described later respectively grip the target reinforcing bars, the first and second tapered portions 21 and 22 corresponding to the outer circumferential surface thereof are formed in the circumferential direction. It is made by hardening the surface by subjecting it to high-frequency heat treatment.

The high-frequency heat treatment of the first and second rigid parts 75 and 76 is performed by rapidly cooling after heating using a high-frequency coil oscillating a frequency of 1 to 500 kHz. It is determined by the permeability, resistance and frequency of the carbon steel that forms it.

Therefore, as shown in FIG. 3, the first and second rigid parts 75a and 76a prevent frequency current from penetrating into more than half of the thickness from the outer circumferential surfaces of the first and second tapered parts 21 and 22, so that the first and second rigid parts 75a and 76a It is preferable that the skin layer of the outer circumferential surface of the 2-tapered portion 21 (22) can be heat treated.

However, it is not limited thereto, and as shown in FIG. 4, at least two of the first and second rigid parts 75b and 75b are spaced at a predetermined interval in the longitudinal direction of the 1 and 2 taper parts 21 and 22. abnormalities may be formed.

On the other hand, it is preferable that the first and second flexible parts 71 and 72 be positioned on the end side of the first and second tapered parts 21 and 22 of the coupler body 20 . The first and second flexible parts 71 and 72 may be made of carbon steel constituting the coupler body 20 . The first and second flexible parts 71 and 72 may be heat treated to a lower strength than the first and second rigid parts 75 and 76 .

In the heat treatment of the coupler body 20, when the heat treatment is performed at a relatively high temperature, the elastic member 50 inserted into the coupler body 20 is heated so that the elastic member 50 and the expansion ring 81 Since the elastic force of (82) may decrease, it is preferable to heat treat at a low temperature within 320 ° C to 400 ° C so that the elastic force of the elastic members does not decrease.

In addition, after forming the first and second rigid parts 75 and 76 by performing high-frequency heat treatment on the first and second taper parts 21 and 22 of the coupler body 20, in order to reduce the brittleness of the first and second rigid parts, high-frequency heat treatment is performed. It is preferable to perform a low-temperature heat treatment at 200° C. to 250° C. or less after the heat treatment.

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The thickness of the first and second tapered portions 21 and 22 of the coupler body 20 may be adjusted for heat treatment of the first and second rigid portions 75 and 76.

On the other hand, the first and second tightening units 30 and 40 have substantially the same structure as each other. The first tightening unit 30 has a third taper part 32 corresponding to the first taper part 21, and is inserted into the hollow part 24 of the coupler body 20, so that the first taper part 21 ) side is provided with a plurality of first tightening members 31 for providing gripping force to the first reinforcing bar 110 by being moved by the elastic member 50. The first tightening unit 30 is arranged along the outer circumferential surface of the first reinforcing bar 110, and may be composed of two to four first tightening members 31. However, it is not limited thereto.

In addition, support protrusions and support grooves into which the support protrusions are inserted may be respectively formed on the lower side of the first tightening members 31 as posture maintaining means for preventing the first reinforcing bars 110 from being disturbed when gripped.

In addition, a plurality of first protrusions 35 may be formed on the inner circumferential surface of the first tightening member 31 for coupling with the reinforcing bar. The first protrusions 35 may be formed in the shape of sawtooth or inclined downward. can And the first projections 35 formed on the first tightening members 31 may be continuously formed along the inner circumferential surface of each first tightening member 31 .

The second tightening unit 40 has a fourth taper part 42 corresponding to the second taper part 22, and is inserted into the hollow part 24 of the coupler body 20, so that the second taper part 22 ) is provided with a plurality of second tightening members 41 that provide gripping force to the second reinforcing bar 120 by being moved by the elastic member 50 to the side. And, like the first tightening member 31, a plurality of second projections 45 are formed on the inner circumferential surface of the second tightening member 41 for coupling with the reinforcing bar.

On the inner circumferential surfaces of the first and second tightening units 30 and 40, expansion rings 81 and 82 are provided to expand the first and second tightening members 31 and 42 constituting them outward. Each can be installed. (See Figure 1)

The elastic member 50 is installed in the hollow part 24 of the coupler body 20 and controls the first and second tightening units 30 and 40 along the first and second taper parts 21 and 22, respectively. It is for elastically biasing toward the insertion holes 21a and 22a 1 and 2, and may be composed of at least one spring. The inner diameter of the spring is preferably formed relatively larger than the diameter of the reinforcing bar to be coupled.

A reinforcing bar insertion position limiting member 25 penetrating the central portion of the coil spring 50 is installed in the central portion of the coupler body 20 . This limits the coupling position of the first and second reinforcing bars 110 and 120 coupled by supporting the ends of the reinforcing bars to be inserted. The reinforcing bar insertion position limiting member 25 may be formed of a rod-shaped member coupled to the central portion of the coupler body 20. However, it is not limited thereto, and rod-shaped support pins may be installed to cross each other.

On the other hand, the first and second confirmation holes 26 for checking the insertion state of the first and second reinforcing bars 110 and 120 coupled to both sides of the coupler body 20 at the center of the reinforcing bar insertion position limiting member 91 ) (27) is formed. The first and second confirmation holes 26 and 27 may be formed in a circular shape, an elliptical shape, or a long hole so as to check the coupling portion of the first and second reinforcing bars 110 and 120.

The action of the one-touch reinforcing bar coupler having an integral coupler body according to the present invention configured as described above is as follows.

First, in order to interconnect the first and second reinforcing bars 110 and 120, the first and second reinforcing bars are inserted through the first and second insertion holes 21a and 22a formed on both sides of the coupler body 20 made of a single member. The end of (110) (120) is inserted so that it comes into contact with the reinforcing bar insertion position limiting member (25).

In this way, the first and second tightening units 30 and 40 are retracted while the spring, which is the elastic member 50, is compressed, and the reinforcing bars are inserted as the first and second tightening members 31 and 41 are expanded. . In addition, the first and second tightening units 30 and 40 in which both ends of the first and second reinforcing bars 110 and 120 are inserted are first and second insertion holes 21a and 22a by springs, which are elastic members 50. ) side, respectively, the first and second reinforcing bars 110 and 120 are gripped by being elastically biased.

As described above, when the first and second reinforcing bars 110 and 120 are coupled by the reinforcing bar coupler 10, when the tensile force acts in the direction in which the first and second reinforcing bars 110 and 120 are separated. , The third taper portion 32 of the first tightening member 31 constituting the first and second tightening units 30 and 40 and the fourth tapered portion 42 of the second tightening member 41 are the coupler body The first and second reinforcing bars 110 and 120 are gripped while being in close contact with the inner circumferential surfaces of the first and second tapered portions 21 and 22 of (20), respectively.

To explain this in more detail, when a tensile force is applied to the first and second reinforcing bars 110 and 120 in the state in which the coupling is made as described above, the first and second tightening units 30 and 40 are at the exit side, that is, It moves to the first and second insertion holes 21a and 22a, respectively. Therefore, the third tapered portion 32 of the first tightening members 31 of the first tightening unit 30 is pressed toward the outer circumferential side of the first reinforcing bar 110 while moving relative to the first tapered portion 21 . And the fourth tapered portion 42 of the second tightening members 41 of the second tightening unit 40 is pressed toward the outer circumferential side of the second reinforcing bar 120 while moving relative to the second tapered portion 21.

When the tensile force acting on the first and second reinforcing bars 110 and 120 gripped as described above increases, the first and second tapered portions 21 and 22 of the coupler body 20 expand, and this external force When the limit of elastic deformation and the limit of plastic deformation are exceeded, it is deformed or broken. ) are formed, respectively, and the first and second flexible parts 71 and 72 are formed on the end side of the first and second taper parts 21 and 22, respectively, so that the first and second tapers of the coupler body 20 It is possible to prevent parts 21 and 22 from being damaged or torn.

In more detail, the first and second tightening members 31 and 41 of the first and second tightening units 30 and 40 are formed by the tensile force acting on the reinforcing bar 110 in the first and second tapered parts ( 21) The feed force acts toward the outlet side of (22) and the force acts in the radial direction, that is, in the direction in which the tightening members are expanded. The first and second tightening members 30 inserted into the coupler body 20 Since the first and second rigid parts 75 and 76 are formed in the first and second tapered parts 21 and 22 that are in close contact with (corresponding to) 40, the first and second tapered parts 21 and 22 It is possible to prevent the first and second taper parts from being damaged by the action force in the direction of being expanded. In this process, the first and second rigid parts 75 and 76 may be damaged by brittleness due to high frequency heat treatment, but the first and second flexible parts 71 and 72 have a relatively large expansion force. The ends of the second rigid parts 75 and 76 are elastically supported to prevent the first and second rigid parts 75 and 76 from being damaged or torn.

This can reduce the amount of slip in the direction in which the first and second reinforcing bars 110 and 120 are separated from each other, and heat-treat the entire coupler body 20 to prevent the coupler body 20 from being deformed as in the prior art. or by designing the thickness of the coupler body to be relatively thick, it is possible to fundamentally solve the factor that increases the production cost.

In particular, by increasing the thickness of the coupler body 20 as in the prior art in order to reduce the initial slip amount, it is possible to fundamentally prevent the concrete coating layer of the reinforcing bar coupler installation part from becoming thin.

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As described above, the one-touch reinforcing bar coupler having an integral coupler body according to the present invention can increase structural strength because the coupler body is integrally formed, and the first and second tapered parts of the coupler body Since the first and second rigid parts are formed, respectively, it is possible to fundamentally prevent expansion or breakage of both ends of the reinforcing bar coupler body by a tensile force acting in a direction in which the reinforcing bars are separated.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is only exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom.

Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the attached registered claims.

The one-touch reinforcing bar coupler having an integral coupler body of the present invention is widely applicable not only to the connection of reinforcing bars when placing bars, but also to the connection of pipes, bolts, beams, rods, etc. used in various industrial facilities.

Claims (6)

It has first and second insertion holes on both sides into which the first and second reinforcing bars to be connected are inserted, and first and second tapered parts formed to gradually expand toward the center from the first and second insertion holes, and a hollow part is formed in the longitudinal direction. An integrated coupler body made of carbon steel;
The first and second clamping members are inserted into the hollow portion on the side of the first and second tapered portions to grip the first and second reinforcing bars, respectively, and are in close contact with the inner circumferential surfaces of the first and second tapered portions, respectively. 2 tightening unit; and
An elastic member installed between the first and second tightening units to elastically bias the first and second tightening members toward the first and second insertion holes, respectively,
The integrated coupler body includes first and second rigid parts respectively formed at portions corresponding to the first and second taper portions, and first and second flexible portions respectively formed at at least one side of portions other than the first and second tapered portions. do,
The one-touch reinforcing bar coupler having an integrated coupler body, characterized in that the first and second rigid parts are respectively formed on the surface layer of the outer circumference of the portion where the first and second tightening members contact the first and second tapered parts. According to claim 1,
The one-touch reinforcing bar coupler having an integral coupler body, characterized in that the first and second flexible parts are formed on the end side of the first and second tapered parts, respectively. The one-touch reinforcing bar coupler having an integrated coupler body according to claim 1, wherein the first and second rigid parts are formed at least two at a predetermined interval in the circumferential direction of the first and second taper parts of the coupler body. According to any one of claims 1 to 3,
The one-touch reinforcing bar coupler with an integrated coupler body, characterized in that the first and second rigid parts are formed by heat-treating the outer circumferential surfaces of the first and second tapered parts by a high-frequency induction heating means.


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