KR100491535B1 - Steel reinforcing joint devices - Google Patents

Abstract

The present invention relates to a reinforcing bar connection device, and more particularly, a "∪" shaped fixture is installed at each end of the coupler connecting the reinforcing bar, and the "V" shape is formed between the fixture and the inner surface of the coupler. The present invention relates to a reinforcing bar connection device in which a compression jack presses an outer peripheral surface of a reinforcing bar by tightening a lock nut by inserting a compression jack so that a rigid coupling is achieved.

The reinforcing bar connection device, in the joint device for connecting the reinforcing bar, both ends of the male threaded portion is formed in the tubular shape, both ends of the inner surface is formed with a tapered portion, the through hole is formed in the direction perpendicular to the tube axis in the center of the tube A double-sided coupler having a locking bar inserted into the through-hole; A female screw portion corresponding to the male screw portion of the double-sided coupler is formed in one inner circumferential surface of the tubular shape respectively coupled to both ends of the double-sided coupler, and a pressure inclined surface having a progressively smaller diameter from the center in the tube length direction to the end portion is formed on the other inner circumferential surface. A lock nut formed; The cylinder is inserted into the lock nut and installed to be in contact with the tapered portion of the double-sided coupler. One side of the cylindrical body forms a cut portion having a predetermined width in the same direction as the axis to give the cylindrical body a constant elasticity inward or outward. In the inner circumferential surface, a plurality of irregularities are formed in the axial direction so as to be in contact with the reinforcing bars inserted into the inner side, and tapered portions are formed on the outer surface of both end portions, respectively, in the axial direction along the tapered portion of the double-sided coupler and the pressure inclined surface of the lock nut when tightening. Characterized in that consisting of; compression jack to move to press the reinforcement.

The reinforcing bar joint according to the present invention configured as described above is a compression jack formed on the inner circumferential surface of a plurality of angles to be fixed or built into the lock nut at the end of the double-sided coupler fixed using a bar-shaped fixture, after combining the bars By tightening the lock nut, the compression jack is moved in the reinforcing direction of the central axis along the pressure inclined surface formed inside the lock nut and the taper formed at the ends of the double-sided coupler, and the compressed jack is fixed by pressing the reinforcing bar. It is.

In particular, the compression jack according to the present invention can provide a uniform fastening force by having a plurality of contact points corresponding to the reinforcing bar having a variety of cross-section is formed in a polygon, such as a square or semi-circular angle of the inner peripheral surface, the fastening force of the lock nut As a result, the central portion of the compression jack, which is formed relatively thin, can be separated in the axial direction to maintain a tighter tightening force, thereby providing a device having easy coupling and a firm fastening force.

Description

Reinforcing joint devices {Steel reinforcing joint devices}

The present invention relates to a reinforcing bar connection device, and more particularly, a "∪" shaped fixture is installed at each end of the coupler connecting the reinforcing bar, and the "V" shape is formed between the fixture and the inner surface of the coupler. The present invention relates to a reinforcing bar connection device in which a compression jack presses an outer peripheral surface of a reinforcing bar by tightening a lock nut by inserting a compression jack so that a rigid coupling is achieved.

In general, the overlap joint method using a binding line was mainly used for the joint of reinforcing bars. This overlapping method was used to increase the amount of rebar used as much as the overlap of the reinforcing bar, the reinforcing bar consumption and cost increases, the binding strength was weak to bear the weight of concrete.

In order to solve this problem, as shown in FIG. 1, a fastening method using a bar of reinforcing bars (Korean Utility Model Registration No. 0223677) has been proposed. The prior art is a pair of semi-cylindrical body (2) having a groove formed on the inner circumferential surface and a coupling (3) fastened to both ends of the semi-cylindrical body and the fixed iron pin (4) to reduce the separation is coupled between the semi-cylindrical body and the coupling It is composed.

Conventional reinforcing bar (1) having such a configuration engages the groove formed in the inner peripheral surface of the semi-cylindr to engage the protruding node of the reinforcing bar 5, and the semi-circular fixed iron pin (4) to the end of the semi-cylindrical body (2) It is fastened by coupling the coupling 3 after mounting, and the fastening is performed in the axial direction of the reinforcement by the force of the bar of the bar and the groove of the semi-cylindrical body.

However, since the reinforcing bar 5 is large in its own weight, a large tensile force is generated in the reinforcing bar connection device 1 so that excessive force is concentrated on the bar of the reinforcing bar, whereby the reinforcing bar part is worn and the fastening force is lost. That is, since the reinforcing bar itself has a shape of an ellipse having a certain size error range rather than a circular shape, the semicylindrical body 2 coupled thereto does not exactly contact the outer surface of the reinforcing bar but one tangent is formed in one semicylinder body. Since the parts are fastened in contact with each other, and the nodes have a certain clearance distance rather than being accurately inserted into the grooves of the semi-cylindrical body, the tensile force acting on the reinforcing bar device 1 acts on a plurality of fastening parts sequentially to cause damage or wear of the bar nodes. There is a problem that the fastening force is lost.

Accordingly, the present invention has been made to solve the above conventional problems,

The compression jacks formed on the inner circumferential surface of a plurality of angles bent are fixed to the end of the double-sided coupler or built into the lock nut, and fixed by using a bar-shaped fixing member, and the lock nuts are fastened after the reinforcing bars are coupled to each other. The jack is moved in the reinforcing direction of the central axis along the tapered portion formed at the end of the double-sided coupler and the pressure inclined surface formed in the lock nut, the moved compression jack is to be fixed by pressing the reinforcement.

In particular, the compression jack according to the present invention can provide a uniform fastening force by having a plurality of contact points corresponding to the reinforcing bar having a variety of cross-section is formed in a polygon, such as a square or semi-circular angle of the inner peripheral surface, the fastening force of the lock nut The center portion of the compression jack formed relatively thin by this is separated in the axial direction to maintain a more tight tightening force, such as to provide a reinforcing bar connection device having easy coupling and solid fastening force.

Rebar joint device of the present invention for achieving the above object,

In the joint device for connecting the reinforcing bars, male threads are formed at the outer ends of the both ends in a tubular shape, tapered portions are formed at both ends of the inner surface, and through-holes are formed at the center of the tubular body in a direction orthogonal to the tube axis to be caught by the through holes. A double-sided coupler having a bar inserted therein; A female screw portion corresponding to the male screw portion of the double-sided coupler is formed in one inner circumferential surface of the tubular shape respectively coupled to both ends of the double-sided coupler, and a pressure inclined surface having a progressively smaller diameter from the center in the tube length direction to the end portion is formed on the other inner circumferential surface. A lock nut formed; The cylinder is inserted into the lock nut and installed to be in contact with the tapered portion of the double-sided coupler. One side of the cylindrical body forms a cut portion having a predetermined width in the same direction as the axis to give the cylindrical body a constant elasticity inward or outward. In the inner circumferential surface, a plurality of irregularities are formed in the axial direction so as to be in contact with the reinforcing bars inserted into the inner side, and tapered portions are formed on the outer surface of both end portions, respectively, in the axial direction along the tapered portion of the double-sided coupler and the pressure inclined surface of the lock nut when tightening. Characterized in that consisting of; compression jack to move to press the reinforcement.

A cutout is formed at one side of the inner circumferential surface of the compression jack, and grooves are formed at three points, such as a portion opposite to the cutout, such as a portion orthogonal to 90 °, so as to reduce the thickness of the compression jack of the grooved portion, thereby tightening the locking nut. It is possible to be in contact with the reinforcing bar inserted in the both sides bent around the groove by the.

In addition, the compression jack is formed to further cut the compression jack up and down by forming another cutting portion in a portion opposite to the cut portion, and forming a groove in the middle portion of the inner peripheral surface of each compression jack to reduce the thickness of the compression jack fastening force of the lock nut It is possible to be in contact with the reinforcing bar inserted in the both sides bent around the groove by the.

Further, both ends of the double-sided coupler is further provided with a fixed bar-shaped bar (bar), the open portion of the fixed body is installed so as to face the lock nut, the opposite portion to the engaging bar of the double-sided coupler It may be installed so as to contact the compression jack between the outer surface of the fixture and the tapered portion of the double-sided coupler.

In addition, the irregularities formed on the inner circumferential surface of the compression jack is a slope formed in a straight line " "In the form or slope of the" It can be formed in the form of ".

The outer peripheral surface of the double-sided coupler on which the external thread is not formed and the outer circumferential surface of the lock nut may be formed with a plurality of protrusions extending in the axial direction to increase the contact area during concrete pouring.

Hereinafter, with reference to the drawings will be described in detail the reinforcing bar device of the present invention.

2 is an exploded perspective view of a reinforcing bar device according to a preferred embodiment of the present invention, Figure 3 is a cross-sectional view of the coupling of the reinforcing bar device according to a preferred embodiment of the present invention, Figure 4a is a cross-sectional view of a double-side coupler according to the present invention Figure 4b is a plan view showing a fixture according to an embodiment of the present invention, Figures 5a, 5b, 5c is a cross-sectional view showing the operating state of the compression jack according to an embodiment of the present invention, Figures 6a, 6b , 6c is a cross-sectional view showing an operating state of the compression jack according to another embodiment of the present invention, Figure 7a, 7b is a cross-sectional view showing an operating state of the compression jack according to another embodiment of the present invention.

As shown in FIGS. 2 and 3, the reinforcing bar 10 of the present invention includes a double-sided coupler 20, a lock nut 30 coupled to the double-sided coupler, and a cylindrical shape inserted into an inner circumference of the lock nut. Compression jacks 40 and 40 '.

The double-sided coupler 20 is a tubular body in the center of the longitudinal direction of the through-hole 25 is formed in a direction orthogonal to the axis, the through-hole 25 is provided with a engaging bar 26 is provided at both ends of the double-sided coupler The insertion depth of the inserted rebar 60 is limited. The engagement of the engaging bar 26 is to form a through-hole 25 on the upper and lower sides of the double-sided coupler to the engaging bar 26 or to form a through-hole only on one side and the inner peripheral surface of the double-sided coupler facing the through-hole There may be used a variety of methods for fixing the locking bar itself, such as to form a groove can be used to fix the locking bar. As a means for limiting the insertion depth of the reinforcing bar, a method of forming the separator 23 in the inner center of the tubular body of the double-sided coupler 20 as shown in FIG. 3 may be used in addition to the locking bar 26 described above.

In addition, male screw portions 21 are formed outside both ends of the double-sided coupler 20, and tapered portions 22 having gradually smaller diameters are formed on the inner circumferential surface of the ends where the male screw portions are formed. The taper 22 supports the compression jacks 40 and 40 ', which will be described later, and serves as a guide for moving the compression jack in the axial direction when a force is applied.

In addition, the outer circumferential surface of the portion in which the male screw portion 21 of the double-sided coupler 20 is not formed is provided with a protrusion 24 that can improve the bonding force when the concrete is placed in the axial direction. The protrusions 24 may be formed in various forms such as circular protrusions in addition to the above-described form.

Next, the lock nut 30 screwed to the end of the double-sided coupler 20 has an internal threaded portion 31 formed on the inner circumferential surface of the double-sided coupler, and has an inner axial direction from an end at which the female-threaded portion 31 is formed. As the tapered pressure inclined surface 32 is gradually formed to have a smaller diameter. In addition, the outer surface of the lock nut 30 by forming a projection 33 similar to or identical to the projection 24 formed on the outer surface of the double-sided coupler 20 can increase the contact area with the concrete when placing concrete.

Next, the compression jacks 40 and 40 'coupled to both ends of the double-sided coupler 20 or embedded in the lock nut 30 are semi-circular bodies consisting of a pair of upper and lower sides or a cylinder having only one side opened as shown in FIG. 5A. It is a sieve. The inner surface of the compression jack (40, 40 ') is formed with a plurality of irregularities 41 in a direction orthogonal to the shaft and a plurality of reinforcement (60) inserted between the two compression jacks (40, 40') facing each other The contact with the contact 45 is to increase the friction force. In addition, at both ends of the outer circumferential surface of the compression jacks 40 and 40 ', a tapered portion 42 is formed in contact with the tapered portion 22 of the double-sided coupler 20 and the pressure inclined surface 32 of the lock nut 30. . The tapered portion 42 of the compression jack slides in the axial direction along the tapered portion 22 of the double-sided coupler and the pressure inclined surface 32 of the lock nut when the lock nut 30 is fastened to press the rebar 60. Will be.

In addition, the compression jack (40, 40 ') is formed in the groove in the same direction as the shaft 44 on one side to form a relatively thin thickness of the grooved portion formed by the fastening force at the time of fastening the lock nut 30 The portion in which the 44 is formed may be bent or broken to further strengthen the coupling between the compression jacks 40 and 40 'and the rebar 60 inserted into the compression jack.

As shown in FIG. 4A, through-holes 25 are formed at both sides of the center of the double-sided coupler 20, and engaging bars 26 are coupled to the through-holes. The locking bar 26 limits the insertion depth of the reinforcement 60 while limiting the insertion depth of the fixing member 50 for fixing the compression jacks 40 and 40 '.

The fixture 50 is a double-sided coupler (20) with the open portion of the fixture facing the lock nut 30 in the form of a bar of "∪" as shown in Figures 2, 3 and 4b. It is to be inserted into both ends of the inside. The fixed body 50 is formed to have a length (L) of the portion in contact with the engaging bar 26 of the double-sided coupler to the same / similar length to the inner diameter of the double-sided coupler 20, the length of the opened portion (l) It is preferable that the end of the fixing body 50 is formed to be inclined by a predetermined length in the axial direction of the double-sided coupler such as to be formed smaller than the length L in contact with the engaging bar. The compression jacks 40 and 40 'are inserted into and fixed between the outer surface of the fixing member 50 and the taper portion 22 of the double-sided coupler, and the grooves 44 of the compression jacks are tightened by the fastening force when the locking nut 30 is fastened. As the formed portion is bent and deformed into a small diameter, the deformed compression jacks 40 and 40 'are easily inserted into the double-sided coupler.

In the structure of the reinforcing bar 10, the compression jack 40, 40 'can be used in various forms.

As shown in FIG. 5A, a cylindrical body may be formed, but a cutting portion 43 may be formed at one side thereof, and a compression jack 40 having a groove 44 may be used at an opposite portion and a portion orthogonal to 90 °. have. When the compression jack 40 is formed in the same size as the inner diameter of the reinforcing bar 60, and tightened the lock nut 30 through the reinforcing bar in a state that is slightly open to the outside using a tool, Figure As shown in 5b, the compression jack 40 is axially moved along the tapered portion 22 of the double-sided coupler and the pressure inclined surface 32 of the lock nut to open the reinforcement 60 easily. Compression jack 40 and the reinforcing bar 60 is in close contact with the silver portion is tightened. Compression jack 40 coupled in this way is a strong contact with the reinforcement 60 having a variety of diameters made of the contact 45 on the four sides separated by the cutting portion 43 and the groove 44 as shown in Figure 5c .

6A, 6B, and 6C, the compression jacks 40 and 40 'may be divided up and down. As shown in FIG. 6A, the compression jacks 40 and 40 'are divided up and down, and the inner surface of each of the compression jacks 40 and 40' is the same curved surface as the outer surface. And the groove 44 is formed in the middle of the inner surface. The fixing member 50 is placed in the groove 44. That is, the fixing member 50 is attached to the double-sided coupler 20. Inserted, the compression jack (40, 40 ') is placed between the tapered portion 22 of the double-sided coupler and the outer surface of the fixture 50, the groove 44 formed on the inner surface of the compression jack bar-shaped fixture Combination with the 50 prevents the compression jacks 40 and 40 'from being moved in the axial direction of the double-sided coupler 20 so that the rebar 60 can be easily inserted. When the lock nut 30 is fastened to the compression jacks 40 and 40 ', both outer tapered portions 42 of the compression jack are locked to the pressure inclined surface 32 of the lock nut and the tapered portion 22 of the double-sided coupler. The nut 30 is moved in the axial direction by the tightening force to tighten the rebar 60.

In addition, since the compression jacks 40 and 40 'have a thin thickness, as shown in FIG. 6B, the grooves 44 are formed, the portion where the grooves 44 are formed may be bent or separated by a fastening force, thereby making a stronger connection. have. That is, since the thickness and cross-sectional shape of the reinforcing bar 60 inserted therein are closer to the ellipse shape than the circle and have various shapes depending on the manufacturer, the compression jacks 40 and 40 'have both sides of the groove 44. Will be bent or separated to be in close contact with the reinforcement 60 by four contacts 45.

In addition, as shown in FIG. 6C, the reinforcing bar 60 inserted into the compression jacks 40 and 40 'includes ribs 61 protruding along the outer diameter of the bar and axially protruding ribs 61 on both sides of the reinforcing cross section. Is formed. Accordingly, by fitting the ribs 61 into the grooves 44 of the compression jack, the reinforcing bar 10 can be prevented from being rotated at the same time as the reinforcing bar 10 is strengthened. (44) can be formed to the same / similar size to the width of the ribs 61 of the reinforcing bar 60 can strengthen the binding force.

The compression jacks 40 and 40 'have inner surfaces formed in straight lines as shown in FIG. 7A. The compression jacks 40 and 40 'also have grooves 44 formed in the middle of the inner surface thereof, so that the thickness of the compression jacks is made thin so that they can be bent or broken during fastening. Since the inner surface is in a straight shape, as shown in FIG. 7B, the fastening force is concentrated at the contact point 45 contacting with the rebar 60 inserted therein, thereby making a strong fastening.

As such, the inner surface of the compression jacks 40 and 40 'may be formed at various angles, and the compression jacks 40 and 40' separated up and down may be separated up and down on the basis of the center of the cylindrical body, but separated into cut sections having a predetermined width. It is preferable to form in the shape of a distorted ellipse when finally contacting the vertical compression jack.

Hereinafter, an operation state of the reinforcing bar device 10 according to the present invention will be described with reference to FIGS. 2 and 3.

The separation membrane 23 or the locking bar 26 which is the inner side of the double-sided coupler 20 with the opening 50 of the fixing body 50, which is a "bar" shaped bar at both ends of the double-sided coupler 20, outwardly. Install in contact with). The compression jacks 40 and 40 ', which are vertically separated between the outer portion of the fixing member 50 and the taper portion 22 of the double-sided coupler, or the compression jack 40 having one side open, are fixed, and the female screw of the lock nut is fixed. The part 31 is screwed to the male screw part 21 of the double-sided coupler. In this process, the rebar 60 is inserted into the double-sided coupler 20 through the lock nut in the state that the lock nut 30 is slightly tightened.

When the rebar 60 is inserted as described above, the lock nut 30 is completely coupled to the double-sided coupler 20, and the compression jacks 40 and 40 ′ are tapered to the double-sided coupler by the fastening force of the lock nut. (22) and the pressure inclined surface 32 of the lock nut is moved in the rebar direction inserted into the double-sided coupler and the lock nut.

At this time, the compression jacks 40 and 40 'are partially inserted into the double-sided coupler smaller than the original diameter, thereby reducing the diameter of the compression jacks. Accordingly, the compression jacks 40 and 40 'are formed to have thinner portions than the other portions in which the grooves 44 are formed, so that they are bent or broken by the fastening force of the lock nut 30 to be separated. As described above, the curved or separated compression jacks 40 and 40 'respectively press the rebar 60 by using a total of four contacts 45, so that a strong fastening is made and the rebar 60 is connected to the rebar joint 10 by the tensile force. It is to prevent this deviation.

In addition, the above-mentioned example is only an example to demonstrate this invention. Therefore, it is obvious that the ordinary skilled in the art to which the present invention pertains uses the partial change with reference to the detailed description.

As described above, the rebar joint device of the present invention,

The compression jacks formed on the inner circumferential surface of a plurality of angles bent are fixed to the end of the double-sided coupler or built into the lock nut, and fixed by using a bar-shaped fixing member, and the lock nuts are fastened after the reinforcing bars are coupled to each other. The jack is moved in the reinforcing direction of the central axis along the tapered portion formed at the end of the pressure inclined surface and the double-sided coupler inside the lock nut, the moved compression jack is to be fixed by pressing the reinforcement.

In particular, the compression jack according to the present invention can provide a uniform fastening force by having a plurality of contact points corresponding to the reinforcing bar having a variety of cross-section is formed in a polygon, such as a square or semi-circular angle of the inner peripheral surface, the fastening force of the lock nut As a result, the central portion of the compression jack, which is formed relatively thin, can be separated in the axial direction to maintain the tighter tightening force, thereby providing a reinforcing bar device having easy coupling and a firm fastening force.

1 is a perspective view showing a conventional reinforcing bar connection device,

2 is an exploded perspective view of a reinforcing bar device according to an embodiment of the present invention,

Figure 3 is a cross-sectional view of the coupling of the reinforcing bar device according to an embodiment of the present invention,

Figure 4a is a cross-sectional view of the double-sided coupler according to the present invention,

Figure 4b is a plan view showing a fixture according to an embodiment of the present invention,

5A, 5B, and 5C are cross-sectional views illustrating an operating state of a compression jack according to an embodiment of the present invention.

6A, 6B, and 6C are cross-sectional views illustrating an operation state of a compression jack according to another embodiment of the present invention.

7A and 7B are cross-sectional views illustrating an operating state of the compression jack according to another embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

10: rebar connection device 20: double-sided coupler

21: male thread portion 22, 43: taper portion

23: separator 24, 33: projection

25 through hole 26 hook bar

30: lock nut 31: female thread

32: pressure inclined surface 40, 40 ': compression jack

41: unevenness 43: cutting portion

44: groove 45: contact

50: fixture 60: rebar

61: rib

Claims (8)

delete In the joint device for connecting rebar, The male screw portion 21 is formed at both ends of the tubular shape, and the tapered portion 22 is formed at both ends of the inner surface, and the through hole 25 is formed at the center of the tube in a direction orthogonal to the tube axis. A double-sided coupler 20 into which the engaging bar 26 is inserted; A female thread portion 31 corresponding to the male screw portion 21 of the double-sided coupler is formed on one inner circumferential surface of the tubular shape respectively coupled to both ends of the double-sided coupler 20, and the other inner circumferential surface is end-to-end from the center of the pipe length direction. A lock nut 30 having a pressure inclined surface 32 having a gradually smaller diameter; The cylindrical body is inserted into the lock nut 30 to be in contact with the tapered portion 22 of the double-sided coupler, and the cylindrical body is formed on one side of the cylindrical body by forming a cutting part 43 having a predetermined width in the same direction as the axis. It provides constant elasticity inward or outward, and forms a plurality of concavities and convexities 41 on the inner circumferential surface so as to be in contact with the reinforcement 60 inserted into the inner side, and taper portions 42 are provided on the outer surfaces of both side ends, respectively. It is formed by the compression jack 40 to move in the axial direction along the tapered portion 22 and the pressure inclined surface 32 of the lock nut of the double-sided coupler when tightening; A cut portion 43 is formed at one side of the inner circumferential surface of the compression jack 40, and grooves 44 are formed at three points, such as a portion opposite to the cut portion 43 and a portion orthogonal to each other by 90 °. Reinforcing bar fittings, characterized in that by compressing the thickness of the compression jack of the portion by the fastening force of the lock nut 30 both sides are bent around the groove 44 is inserted into the reinforcing bar inserted into the inside. delete In the joint device for connecting rebar, The male screw portion 21 is formed at both ends of the tubular shape, and the tapered portion 22 is formed at both ends of the inner surface, and the through hole 25 is formed at the center of the tube in a direction orthogonal to the tube axis. A double-sided coupler 20 into which the engaging bar 26 is inserted; A female thread portion 31 corresponding to the male screw portion 21 of the double-sided coupler is formed on one inner circumferential surface of the tubular shape respectively coupled to both ends of the double-sided coupler 20, and the other inner circumferential surface is end-to-end from the center of the pipe length direction. A lock nut 30 having a pressure inclined surface 32 having a gradually smaller diameter; The cylindrical body is inserted into the lock nut 30 to be in contact with the tapered portion 22 of the double-sided coupler, and the cylindrical body is formed on one side of the cylindrical body by forming a cutting part 43 having a predetermined width in the same direction as the axis. It provides constant elasticity inward or outward, and forms a plurality of concavities and convexities 41 on the inner circumferential surface so as to be in contact with the reinforcement 60 inserted into the inner side, and taper portions 42 are provided on the outer surfaces of both side ends, respectively. It is formed by the compression jack 40 to move in the axial direction along the tapered portion 22 and the pressure inclined surface 32 of the lock nut of the double-sided coupler when tightening; The double-sided coupler 20 is further provided with a fixed body 50 in the form of a "∪" bar (bar) at both ends, the open portion of the fixed body 50 to face the lock nut 30, The opposing part is installed to be in contact with the engaging bar 26 of the double-sided coupler so as to place the compression jack (40, 40 ') between the outer surface of the fixed body 50 and the taper portion 22 of the double-sided coupler. , The compression jack 40 is formed by further cutting the other cutting portion 43 in a portion opposed to the cutting portion 43 to separate the compression jack (40, 40 ') up and down, each of the compression jack (40, 40') By forming a groove 44 in the middle portion of the inner circumferential surface to make the thickness of the compression jack thin so that both sides are bent around the groove 44 by the fastening force of the lock nut 30 so as to contact the reinforcement 60 inserted into the inner surface. Reinforcing bar device characterized in that. The method according to claim 2 or 4, The unevenness 41 formed on the inner circumferential surface of the compression jacks 40 and 40 'has an inclined surface formed in a straight line. Rebar joint device characterized in that it is made in the form of ". The method of claim 5, Reinforcing bar connection device, characterized in that the outer peripheral surface of the male coupler of the double-sided coupler 20 and the outer peripheral surface of the lock nut 30 is formed with a plurality of projections (24, 33) elongated in the axial direction. The method according to claim 2 or 4, The unevenness 41 formed on the inner circumferential surface of the compression jacks 40 and 40 'has an inclined surface formed in a curved line. Reinforcing bar device characterized in that formed in the form of ". The method of claim 7, wherein Reinforcing bar connection device, characterized in that the outer peripheral surface of the male coupler of the double-sided coupler 20 and the outer peripheral surface of the lock nut 30 is formed with a plurality of projections (24, 33) elongated in the axial direction.