Reinforcing bar fastener for reinforcing bar coupler, and reinforcing bar coupler using same

Abstract

A reinforcing bar fastener for a reinforcing bar coupler, and the reinforcing bar coupler using same are disclosed. The reinforcing bar fastener for a reinforcing bar coupler, according to the present invention, is interposed between a coupler body and a reinforcing bar to be coupled, so as to be coupled to a coupling threaded part formed on the inner peripheral surface of the coupler body, thereby clamping the reinforcing bar, and comprises: a fastening body having, on the outer peripheral surface thereof, a coupling threaded part to be coupled to the coupling threaded part of the coupler body, and having, on the inner peripheral surface thereof, a reinforcing bar clamping part for clamping the reinforcing bar; and a movement-interference removal part, which removes movement interference when the fastening body moves toward the center of the reinforcing bar by means of the threaded coupling force of the coupling threaded part of the coupler body and the coupling threaded part of the fastening body, in order to increase the clamping force on the reinforcing bar, wherein the movement-interference removal part is formed by setting a thread engagement area between the coupling threaded part of the coupler body and the coupling threaded part of the fastening body such that same gradually narrows from the center of the fastening body toward both sides thereof.

Description

Reinforcement clamping device for reinforcing bar coupler and reinforcing bar coupler using the same

[0001] The present invention relates to a rebar tightening device for a rebar coupler and a rebar coupler using the same, and more particularly, to a rebar tightening device for a rebar coupler and a rebar coupler using the same, which can increase the gripping power of rebar by eliminating interference with the rebar tightening device that is screw-connected to the coupler body when connecting rebars from moving toward the center of the rebar due to the screw-connecting force, and can minimize slipping of rebar due to tensile force acting on the rebar by reducing the amount of residual slip due to connecting rebars.

[0002] In general, when constructing concrete structures for building construction and various civil engineering works, reinforcement work is performed to reinforce the concrete. Since the reinforcement arranged at this time is manufactured in standardized lengths, work is required to interconnect the reinforcement.

[0003] As a method of interconnecting reinforcing bars, methods of connecting using connecting devices such as lap joints, welding joints, screw joints, and couplers have been proposed.

[0004] Korean Patent Registration No. 10-1030579 (publication date: April 21, 2011) discloses a rebar coupler, which is a device for connecting rebars, and Korean Patent Registration No. 10-1003302 (publication date: December 22, 2010) discloses a high-strength rebar coupler.

[0005] The rebar coupler described in the above patent document has a plurality of coupler housings having tapered portions and being mutually coupled, and a plurality of coupler locks installed inside the coupler housings and having tapered portions corresponding to each tapered portion.

[0006] Korean Patent Registration No. 10-0977658 (publication date: August 17, 2010) discloses a bar connecting device, and Korean Patent Publication No. 10-2014-0056009 (publication date: May 9, 2014) discloses a ring-fixed type rebar coupler.

[0007] Korean Patent No. 10-1856949 (publication date: May 4, 2018) discloses a reinforcing bar joint device, Korean Patent No. 10-2281267 (publication date: July 19, 2021) discloses a reinforcing bar tightening tool and a reinforcing bar coupler including the same, and Korean Patent No. 10-2452910 (publication date: October 5, 2022) discloses a reinforcing bar joint device having a knob with excellent compatibility and fixation with deformed reinforcing bars.

[0008] The rebar joint device described in the above patent document includes a pair of knobs having external threads formed on the outer circumference thereof and protruding steps formed along the longitudinal direction of both ends of the outer circumference thereof, a coupler having internal threads formed on the inner circumference thereof to be screw-connected to the external threads formed on the outer circumferences of the pair of knobs and having internal threads formed on the inner circumference of the other end thereof, and a sleeve having internal threads formed on the inner circumference thereof to be screw-connected to the external threads formed on the outer circumferences of the pair of knobs and having external threads formed on the outer circumference thereof to be screw-connected to the internal threads formed on the inner circumference of the other end of the coupler.

[0009] As described above, the conventional rebar joint device has a problem in that, when a coupler having a female thread formed on the inner surface and a knob having a male thread formed on the outer surface to grip the rebar are screwed together, the knob does not move smoothly in the direction in which the knob grips the rebar (toward the center of the rebar). That is, since a tapered portion is formed at the threaded portion of the outer surface of the knob and the inner surface of the coupler, the knob moves along the tapered portion due to the screw coupling force. However, since the spiral direction of the male thread portion formed on the outer surface of the knob and the female thread portion formed on the inner surface of the coupler is formed in the normal direction to the rebar coupler, there is a problem in that smooth movement toward the center of the rebar does not occur. In addition, when the knob moves along the tapered portion toward the center of the rebar, a component force in the direction of movement is generated at the screw joint portion as it moves from the center of the outer surface of the knob to both sides, so that the knob does not move smoothly.

[0010] And, Republic of Korea Patent No. 10-1563637 (publication date: October 21, 2015) discloses a pipe-type rebar connecting device. The rebar connecting device described in the above patent document comprises a segmented pipe having a tapered outer surface and connected to the end of the rebar to be connected, a connecting pipe screw-connected to the segmented pipe, and a connecting pipe connecting the connecting pipes.

[0011] These conventional rebar connectors can only grip rebars of a specific diameter, and rebars with a diameter smaller than the inner surface of the split pipe are difficult to grip due to the resulting play. Furthermore, for rebars with a diameter larger than the inner surface of the split pipe, the center of the split pipe is separated from the rebar, and the ends of the inner surface of the split pipe come into contact with the rebar first. This disperses the gripping force, making it difficult to resolve the problem of slippage caused by the tensile force acting on the rebar.

[0012] In particular, the split pipe having a screw portion formed on the tapered outer surface moves toward the outer surface of the reinforcing bar when combined with the female screw portion of the connecting pipe to grip the reinforcing bar, but as it moves from the center of the outer surface of the split pipe to both sides, the direction of movement of the split pipe and the direction of application of the transfer force are different, so that movement toward the center of the reinforcing bar is not smooth, and further, there is a limit to increasing the gripping force of the reinforcing bar.

[0013] Korean Patent No. 10-1857586 (publication date: May 8, 2018) discloses a coupler for splicing rebar. The coupler for splicing rebar described in the above patent document has a structure in which a hollow body-shaped tightening nut having threads formed on the inner surface is fastened to both ends of the hollow body, the inner diameter of the tightening nut is formed to decrease toward one end, and a hollow reinforcing bar tightening member corresponding to the inner diameter of the tightening nut is inserted into the inner side of the tightening nut on both sides of the body.

[0014] These conventional rebar joint couplers have limited ability to increase the bonding strength of rebars, as the tightening force is determined by the screw-fitting force between the main body and the tightening nut. Consequently, they have limited ability to reduce slippage due to tensile forces acting on the joined rebars, and they also require a relatively large amount of work to join the rebars.

[0015] In addition, it is difficult to eliminate the residual slip that may occur due to the tensile force applied from the outside to the screw joint area even if the rebar coupler using the conventional screw joint method increases the screw joint force and thus the rebar gripping force.

[0016] The present invention is intended to solve the problems of the prior art as described above, and to provide a rebar coupler using the same, which can increase the gripping power of rebar by eliminating interference that restricts movement of rebar toward the center when the coupler body and screw are connected, and further, can reduce the amount of slip due to tensile force acting on the connected rebars.

[0017] Another object of the present invention is to provide a rebar coupler having a relatively simple structure, in which both ends of the rebars to be connected are joined in a close state when the rebars are joined, and in which the gripping force of the rebars is increased to reduce the amount of potential slippage, thereby improving the coupling quality, and a rebar coupler using the same.

[0018] In order to achieve the above object, the present invention provides a reinforcing bar coupler clamping device, which is interposed between a coupler body and a reinforcing bar to be coupled, and which engages with a engaging screw portion formed on an inner circumferential surface of the coupler body to grip the reinforcing bar, and which comprises: a tightening body having a engaging screw portion formed on an outer circumferential surface to engage with the engaging screw portion of the coupler body, and a reinforcing bar gripping portion formed on an inner circumferential surface for gripping the reinforcing bar; and a movement interference exclusion portion for increasing the gripping force of the reinforcing bar by eliminating movement interference when the tightening body moves toward the center of the reinforcing bar by the screw engaging force of the engaging screw portion of the coupler body and the engaging screw portion of the tightening body; characterized in that the movement interference exclusion portion is configured such that the screw engaging area between the engaging screw portion of the coupler body and the engaging screw portion of the tightening body gradually narrows as it goes from the center of the tightening body to both sides.

[0019] It is preferable that the above-mentioned movement interference exclusion part be set so that the center of the radius of curvature of the outer surface of the tightening body on which the coupling screw part is formed is spaced apart by a predetermined distance from the center of the radius of curvature of the inner surface of the tightening body on which the rebar gripping part is formed in the direction of the center of the outer surface of the tightening body, so that the outer surface of the tightening body has a shape in which the center side protrudes more than the two sides.

[0020] Alternatively, the movement interference exclusion unit may have a non-circular shape in which the outer surface of the tightening body, in which the coupling screw portion is formed, has a radius of curvature that increases from the center toward both sides, so that the outer surface of the tightening body protrudes in the center compared to the both sides.

[0021] In addition, a tightening slope can be formed at an angle corresponding to the guide slope of the screw thread of the coupling screw portion of the coupler body on the screw threads of the coupling screw portion formed on the outer surface of the tightening body.

[0022] In addition, the coupling screw portion formed on the outer surface of the tightening body may be formed to be tapered along the length direction at an angle corresponding to the coupling screw portion of the coupler body.

[0023] Alternatively, the movement interference exclusion member may be configured by forming at least one notch portion in the longitudinal direction on the inner surface of the tightening body where the reinforcing bar grip portion is formed or on the outer surface where the connecting screw portion is formed.

[0024] According to another aspect of the present invention, a rebar coupler according to the present invention comprises: a coupler body having a first rebar coupling part having a first hollow portion and a first coupling screw portion formed on an inner surface thereof; a second rebar coupling part having a second hollow portion extending from the first rebar coupling part and communicating with the first hollow portion, and a second rebar coupling part having a second coupling screw portion formed on an inner surface thereof; a first tightening unit having a plurality of first rebar tightening members, the first tightening body having a third coupling screw portion formed on an outer surface thereof and coupled to an end of a first rebar coupled to the first rebar coupling part of the coupler body, the third coupling screw portion coupled to the first coupling screw portion being formed on an outer surface thereof, and a first rebar gripping portion formed on an inner surface thereof for gripping the first rebar; A second tightening unit having a plurality of second reinforcing bar tightening members, which are coupled to the end of the second reinforcing bar coupled to the second reinforcing bar connecting portion of the coupler body, and which has a second tightening body having a fourth coupling screw portion coupled to the second coupling screw portion formed on the outer circumference thereof and a second reinforcing bar gripping portion formed on the inner circumference thereof for gripping the second reinforcing bar; And the first and second movement interference exclusion parts are included to eliminate movement interference when the first and second tightening bodies move toward the center of the first and second reinforcing bars, respectively, by the screw coupling force of the first coupling screw part of the coupler body and the third coupling screw part of the first tightening body and the screw coupling force of the second coupling screw part of the coupler body and the fourth coupling screw part of the second tightening body, thereby increasing the gripping force of the first and second reinforcing bars, and the first and second movement interference exclusion parts are characterized in that the screw coupling area between the first coupling screw part and the third coupling screw part and the screw coupling area between the second coupling screw part and the fourth coupling screw part gradually narrow as they move from the center of the first and second tightening bodies to both sides.

[0025] The first and second movement interference exclusion sections are set so that the center of the radius of curvature of the outer surface of the first and second tightening bodies on which the third and fourth connecting screw sections are formed is spaced apart by a predetermined distance from the center of the radius of curvature of the inner surface of the first and second tightening bodies on which the first and second reinforcing bar gripping sections are formed in the direction of the center of the outer surface of the first and second tightening bodies, so that the outer surface of the first and second tightening bodies can have a shape in which the center side protrudes more than the two sides.

[0026] Alternatively, the first and second movement interference exclusion sections may have a non-circular shape in which the central portion protrudes more than the side portions by setting the radius of curvature of the outer surface of the first and second tightening bodies, on which the third and fourth coupling screw portions are formed, to become larger from the central portion toward the side portions, respectively.

[0027] In addition, it is preferable that a guide slope is formed on at least one of the screw threads of the first and second coupling screw portions of the coupler body, and a tightening slope is formed at an angle corresponding to the guide slope on at least one of the screw threads of the third and fourth coupling screw portions formed on the outer surface of the first and second tightening bodies.

[0028] In addition, at least one of the first and second coupling screw portions of the coupler body may be formed to be tapered along the longitudinal direction at a predetermined angle, and at least one of the third and fourth coupling screw portions formed on the outer peripheral surface of the first and second tightening bodies may be formed to be tapered along the longitudinal direction at an angle corresponding to the angle of the taper.

[0029] Alternatively, the first and second movement interference exclusion sections may be configured by forming at least one notch portion in the longitudinal direction on the inner surface where the first and second reinforcing bar gripping sections of the first and second tightening bodies are formed or on the outer surface where the third and fourth connecting screw sections are formed, respectively.

[0030] In addition, a pitch alignment part may be further provided for aligning the pitch of the third and fourth connecting screw parts of the first and second tightening bodies that are misaligned by the beads of the first and second reinforcing bars when the first and second reinforcing bars are connected to the first and second reinforcing bar gripping parts, which are respectively formed on one of the tightening bodies and the other of the first and second reinforcing bar tightening parts.

[0031] The above pitch alignment part may be configured such that lead grooves are installed at the pitch interval of the third and fourth coupling screw parts on one edge of one of the tightening bodies, and coupling protrusions are formed at the pitch interval of the third and fourth coupling screw parts on the other edge of the other tightening body.

[0032] An auxiliary reinforcing bar tightening member may be further interposed between the first reinforcing bar connecting portion and the first tightening unit of the coupler body or between the second reinforcing bar connecting portion and the second tightening unit, and an auxiliary screw portion coupled to the first and second coupling screw portions of the coupler body may be formed on the outer surface of the auxiliary reinforcing bar tightening member, and a coupling portion coupled to the third and fourth coupling screw portions of the first and second tightening units may be formed on the inner surface of the auxiliary reinforcing bar tightening member.

[0033] The reinforcing bar coupler according to the present invention and the reinforcing bar coupler using the same can improve reinforcing bar gripping power by maximizing the amount of movement toward the center of the reinforcing bar when the reinforcing bar coupler is screw-connected to the coupler body, and can reduce the amount of residual slip remaining in the joint portion between the coupler body and the reinforcing bar coupler and the joint portion between the connecting reinforcing bar and the reinforcing bar coupler.

[0034] This reduction in residual slip can improve the coupling quality of the rebar coupler by maximally preventing the connected rebars from slipping in the direction of mutual separation due to the initial slip applied to the rebars after connection, i.e., the tensile force applied to the rebars.

[0035] FIG. 1 is an exploded perspective view illustrating one embodiment of a rebar coupler using a rebar tightening device according to the present invention.

[0036] Figure 2 is an exploded perspective view showing another embodiment of a rebar coupler using a rebar tightening device according to the present invention.

[0037] Figure 3 is an exploded perspective view of the first tightening unit of the rebar coupler illustrated in Figure 1.

[0038] Figure 4 is a plan view showing the first reinforcing bar tightening member of the first tightening unit illustrated in Figure 3.

[0039] Figure 5 is an exploded perspective view of the second tightening unit of the rebar coupler illustrated in Figure 1.

[0040] Figure 6 is a perspective view of the second reinforcing bar tightening member of the second tightening unit illustrated in Figure 5.

[0041] Figures 7 to 10 are perspective views illustrating other embodiments of a reinforcing bar tightening device used in a reinforcing bar coupler according to the present invention.

[0042] Fig. 11 is an exploded perspective view showing another embodiment of a rebar coupler using a rebar tightening device according to the present invention.

[0043] Fig. 12 is a perspective view showing a part of the rebar coupler shown in Fig. 1 cut away from the combined state.

[0044] Fig. 13 is a cross-sectional view showing the state in which the coupler body of the reinforcing bar coupler illustrated in Fig. 1 and the first reinforcing bar tightening member are screw-connected.

[0045] Fig. 14 is a cross-sectional view showing the state in which the coupler body and the second reinforcing bar tightening member of the reinforcing bar coupler illustrated in Fig. 1 are screw-connected.

[0046] Figures 15 and 16 are cross-sectional views showing a state in which a coupler body of a rebar coupler using a rebar tightening device according to the present invention and a rebar tightening device of another embodiment are screw-connected.

[0047] Examples of a reinforcing bar coupler according to the present invention and a reinforcing bar coupler using the same are shown in FIGS. 1 to 16.

[0048] Referring to the drawing, the reinforcing bar coupler (10) according to the present embodiment is configured to interconnect first and second reinforcing bars (300) (310) installed inside a concrete structure to reinforce structural strength, and comprises a coupler body (20) and first and second tightening units (50) (60) that are screw-connected to the coupler body (20) while being respectively connected to the ends of the first and second reinforcing bars (300) (310) to be connected.

[0049] The first tightening unit (50) has at least two first reinforcing bar tightening members (51), and the second tightening unit (60) has at least two second reinforcing bar tightening members (61), but is not limited thereto and may have three or more reinforcing bar tightening members.

[0050] At least one side of the first and second reinforcing bar tightening members (51)(61) of the first and second tightening units (50)(60) is provided with a movement interference exclusion means that reduces interference with movement for reinforcing bar gripping when screw-joining with the coupler body (20) while holding the first and second reinforcing bars (300)(310) to be connected, thereby increasing the gripping power of the first and second reinforcing bars (300)(310).

[0051] The above-mentioned movement interference exclusion means is composed of a first movement interference exclusion part (110) formed in the first reinforcing bar tightening member (51) and a second movement interference exclusion part (120) formed in the second reinforcing bar tightening member (61). The first and second movement interference exclusion parts (110)(120) may have substantially the same structure.

[0052] The reinforcing bar tightening device according to the present invention configured as described above and the reinforcing bar coupler using the same are described in more detail by component as follows.

[0053] The above coupler body (20) has a first hollow portion with a uniform diameter and a first reinforcing bar connecting portion (30) having a first connecting screw portion (31) formed on the inner surface thereof, and a second reinforcing bar connecting portion (40) having a tapered second hollow portion extending from the first reinforcing bar connecting portion (30) and having a reduced diameter and having a second connecting screw portion (41) formed on the inner surface thereof. The first hollow portion and the second hollow portion are mutually connected.

[0054] The above second reinforcing bar joint (40) is formed into a structure having a tapered inner diameter and outer diameter by axially connecting one side of a pipe-shaped main body having a predetermined diameter.

[0055] The coupler body (20) is not limited to the above-described embodiment, and for example, as shown in FIG. 2, the hollow portion of the second reinforcing bar joint (45) may be formed to have the same diameter as the hollow portion of the first reinforcing bar joint (30) without being tapered. In this case, a second coupling screw portion (46) having substantially the same structure as the first coupling screw portion (31) may be formed in the second reinforcing bar joint (45). At this time, the second tightening unit (60) coupled to the second reinforcing bar joint (45) has the same structure as the first tightening unit (50).

[0056] A guide slope (36) inclined toward the inlet side is formed on the female screw threads of the first coupling screw portion (31) formed on the inner surface of the first reinforcing bar joint portion (30). That is, the first coupling screw portion (31) is formed with a guide slope (36) inclined toward the inlet side where the first reinforcing bar (300) to be joined is inserted, thereby providing a sawtooth-shaped female screw.

[0057] And, it is preferable that the second connecting screw portion (41) formed on the inner surface of the second reinforcing bar connecting portion (40) provided on the side opposite to the first reinforcing bar connecting portion (30) and the fourth connecting screw portion (65) formed on the second reinforcing bar tightening member (61) be formed in a multi-spiral shape.

[0058] Meanwhile, the first tightening unit (50) is coupled to the end side of the first reinforcing bar (300) to be coupled and is screw-coupled with the first coupling screw portion (31), and includes a plurality of first reinforcing bar tightening members (51) having a third coupling screw portion (55) formed on the outer surface thereof. A tightening slope (56) is formed on the male screw thread of the third coupling screw portion (55) formed on the outer surface of each of the first reinforcing bar tightening members (51) to correspond to the guide slope (36) of the first coupling screw portion (31).

[0059] And, on the inner surface of each first reinforcing bar tightening member (51), a first reinforcing bar gripping portion (54) is formed so as to be combined with a bead (300a) formed on the outer surface of the first reinforcing bar (300).

[0060] The first reinforcing bar holding portion (54) is formed to have a curvature corresponding to or smaller than the curvature of the outer surface of the first reinforcing bar (300) to be joined, and a pattern having substantially the same shape as the pattern of the bead (300a) formed on the outer surface of the first reinforcing bar (300) is formed on the inner surface of the first reinforcing bar holding portion (54). The pattern formed on the inner surface of the first reinforcing bar holding portion (54) may be formed to be relatively larger than the pattern of the bead formed on the outer surface of the reinforcing bar in order to ensure smooth joining with the first reinforcing bar (300).

[0061] And the first movement interference exclusion part (110) of the movement interference exclusion means provided in the first reinforcing bar tightening members (51) of the first tightening unit (50) is to exclude interference with the movement of the first reinforcing bar tightening member (51) toward the center of the first reinforcing bar (300) due to the screw coupling force when the coupler body (20) and the first reinforcing bar tightening member (51) are screw-coupled. Referring to FIGS. 1, 3, and 4, the first movement interference exclusion part (110) is described in more detail. The first movement interference exclusion part (110) is configured so that the screw coupling area between the first coupling screw part (31) and the third coupling screw part (55) gradually narrows from the center of the first tightening body (51a) of the first reinforcing bar tightening member (51) toward both sides. As an example for implementing this configuration of the first moving interference exclusion unit (110), the center (RC) of the radius of curvature (R2) of the outer surface of the first tightening body (51a) on which the third coupling screw portion (55) is formed is configured to be eccentrically spaced apart by a predetermined distance from the center (CC) of the radius of curvature (R1) of the inner surface of the first tightening body (51a) on which the first reinforcing bar gripping portion (54) is formed toward the center of the outer surface of the first tightening body (51a).

[0062] Accordingly, the central portion of the outer surface of the first tightening body (51a) on which the third connecting screw portion (55) is formed forms a non-circular shape that protrudes based on the center of curvature radius (CC) of the first reinforcing bar grip portion (54) of the first tightening body (51a). That is, the inner surface of the first tightening body (51a) has an arc shape, while the outer surface of the first tightening body (51a) has a shape in which the central portion protrudes more than the two sides.

[0063] Here, the first tightening body (51a) can be manufactured by precision casting, and it is preferable that the heights of the valleys and peaks of the third connecting screw portion (55) formed on the outer surface of the first reinforcing bar tightening member (51) be formed uniformly.

[0064] The above first movement interference exclusion section (110) is not limited to the above-described embodiment, and may be implemented by forming the central portion of the outer surface of the first tightening body of the first reinforcing bar tightening member (51) into a protruding non-circular shape. Alternatively, by setting the radius of curvature of the outer surface of the first tightening body (51a) on which the third coupling screw portion (55) is formed to become larger from the central portion toward the ends on both sides, the outer surface of the first tightening body (51a) may be formed into a non-circular shape with the central portion protruding compared to the ends on both sides.

[0065] At this time, it is preferable that the radius of curvature of the central portion of the outer surface of the first reinforcing bar tightening member (51) does not exceed the radius of the first connecting screw portion (31).

[0066] And, in the first reinforcing bar tightening members (51), a first support ring (53) having elasticity is installed so that the first reinforcing bar tightening member can maintain a state of being coupled to the end of the first reinforcing bar (300) before being coupled to the coupler body (20). It is preferable to form a first support groove (53a) on the outer circumference of the first reinforcing bar tightening members (51) so that interference by the first support ring (53) does not occur when the first coupling screw portion and the third coupling screw portion are coupled.

[0067] The second tightening unit (60) for gripping the second reinforcing bar (310) includes a plurality of second reinforcing bar tightening members (61) that are coupled to the end side of the second reinforcing bar (310) to be coupled. On the outer surface of the second tightening body (61a) of the second reinforcing bar tightening member (61), a tapered fourth coupling screw portion (65) is formed that is screw-coupled with the second coupling screw portion (41) formed on the inner surface of the tapered hollow portion of the second reinforcing bar coupling portion (40) of the coupler body (40).

[0068] And, on the inner surface of the second tightening body (61a) of the second reinforcing bar tightening member (61), a second reinforcing bar gripping portion (64) having a predetermined radius of curvature is formed so as to be combined with a bead (310a) formed on the outer surface of the second reinforcing bar (310). It is preferable that the second reinforcing bar gripping portion (64) be formed in a pattern substantially identical to the pattern of the bead (310a) of the second reinforcing bar.

[0069] For example, the first and second reinforcing bar holding portions (54)(64) may be formed so that joint-shaped beads (300a)(310a) formed staggered on both sides of the outer circumference of the first and second reinforcing bars (300)(310) as shown in FIG. 1 can be joined, or may be formed in a shape corresponding to a continuous spiral or diagonal bead.

[0070] A second support ring (63) having elasticity can be installed on the outer surface of the second reinforcing bar tightening members (61) so that the second reinforcing bar tightening members can maintain a state of being coupled to the end of the second reinforcing bar (310) before being coupled to the coupler body (20).

[0071] Meanwhile, it is preferable that the lead according to the screw connection between the second coupling screw portion (41) of the coupler body (20) and the fourth coupling screw portion (65) of the second reinforcing bar clamping member (61) be set to be larger than the lead according to the screw connection between the first coupling screw portion (31) of the coupler body (20) and the third coupling screw portion (55) of the first reinforcing bar clamping member (51). That is, it is preferable that the axial movement distance of the second reinforcing bar clamping member (61) according to one rotation of the second reinforcing bar clamping member (61) with respect to the second coupling screw portion (41) be larger than the axial movement distance of the first reinforcing bar clamping member (51) according to one rotation of the first reinforcing bar clamping member (51) with respect to the first coupling screw portion (31). In addition, it is preferable that the spiral direction of the second coupling screw portion (41) be formed opposite to the spiral direction of the first coupling screw portion (31).

[0072] And the second movement interference exclusion unit (120) provided in the second tightening unit (60) may have substantially the same structure as the first movement interference exclusion unit (110). That is, the second movement interference exclusion unit (120) is to exclude interference with the movement of the second reinforcing bar (300) toward the center by the screw coupling force of the second reinforcing bar tightening unit (51) when the coupler body (20) and the second reinforcing bar tightening unit (61) are screw-coupled. To this end, the second movement interference exclusion unit (120) is set so that the screw coupling area between the second coupling screw portion (41) and the fourth coupling screw portion (65) gradually narrows from the center of the second tightening body (51a) of the second reinforcing bar tightening unit (61) toward both sides.

[0073] As shown in FIGS. 5 and 6, in order to implement the second movement interference exclusion section (120), a fourth coupling screw section (65) is formed, and the outer circumferential surface of the second tightening body (61a) of the second reinforcing bar tightening member (61) formed in a tapered shape may be formed in a curved shape in which the central portion thereof protrudes compared to the two sides.

[0074] The second moving interference exclusion section (120) is formed as an eccentric structure in which the center (RT) of the radius of curvature (R3) of the outer surface of the second tightening body (61a) is spaced a predetermined distance from the center (CC) of the radius of curvature (R1) of the inner surface of the second tightening body (61a), i.e., the second reinforcing bar gripping section (64), toward the center of the outer surface of the second tightening body (61a). As illustrated in FIGS. 5 and 6, the outer surface of the second tightening body (61a) is formed in a tapered structure, so the width of the second tightening body (61a) becomes wider from the upper end to the lower end, and the eccentric radius of curvature (R3) becomes larger from the upper end to the lower end.

[0075] Accordingly, the central portion of the tapered outer surface of the second tightening body (61a) is formed in an arc shape corresponding to the radius of curvature (R3) along the longitudinal direction, and the central portion of the outer surface has a structure that protrudes compared to both sides with respect to the center of the radius of curvature (CC) of the second reinforcing bar gripping portion (64) of the second tightening body.

[0076] As another embodiment of the second moving interference exclusion unit (120), the central portion of the tapered outer surface of the second tightening body (61a) corresponding to the center of curvature (CC) of the first reinforcing bar gripping unit (64) of the second tightening body (61a) may be formed as a curved surface protruding with a predetermined curvature, or may be formed as a shape in which the curvature radius gradually increases from the central portion to both sides.

[0077] In this case, since the outer surface of the second tightening body (61a) has a structure that is tapered in the longitudinal direction, the radius of curvature of the center of the outer surface gradually increases from the upper side to the lower side of the second tightening body.

[0078] FIGS. 7 to 10 illustrate the fourth and fifth moving interference exclusion units (130) (135), which are other embodiments of the moving interference exclusion units formed in the first and second reinforcing bar tightening members (51) (61) of the first and second tightening units (50) (60), respectively.

[0079] The fourth movement interference exclusion section (130) is formed by forming a first notch (131) in the longitudinal direction on the outer circumference (see FIG. 7) or inner circumference (see FIG. 6) of each first tightening body (51a) of the first reinforcing bar tightening member (51). The first notch (131) is configured to change the outer diameter of the first tightening body (51a) by plastic deformation or elastic deformation when the first reinforcing bar tightening member (51) and the coupler body (20) are screw-coupled to each other.

[0080] The fifth movement interference exclusion section (135) is formed with second notches (136) in the longitudinal direction on the outer surface (see FIG. 9) or inner surface (see FIG. 10) of each second tightening body (61a) of the second reinforcing bar tightening member (61), so that when the second reinforcing bar tightening member and the coupler body (20) are mutually screw-connected, plastic deformation or elastic deformation occurs to change the outer diameter of the second tightening body (61a).

[0081] In the case where the first and second notch portions (131)(136) are formed on both the inner and outer surfaces of the first and second tightening bodies (51a)(61a), it is preferable that the notch portions formed on the inner surface and the notch portions formed on the outer surface are formed to be staggered from each other. In addition, a through hole (not shown) penetrating the first tightening body (51) or the second tightening body (61) may be formed in the first and second notch portions (131)(136).

[0082] Meanwhile, as illustrated in FIG. 3, a plurality of first reinforcing bar tightening members (51) forming the first tightening unit (50) are further provided with a pitch alignment member (140) for aligning the pitch of the third coupling screw portions (55) of the first reinforcing bar tightening members (51) that are misaligned due to the beads (300a) of the reinforcing bars (300) to be joined. In order to implement the pitch alignment member (140), lead-in grooves (141) are formed longitudinally at the pitch interval of the third coupling screw portions (55) on one edge of one of the first tightening bodies (51a), and coupling protrusions (142) are formed at the pitch interval of the third defective screw portion on the other edge of the first tightening body (51a). On one side and the other side of another tightening body (51a) coupled with one of the first tightening bodies, a coupling projection and an insertion groove are formed, respectively, to interlock with the insertion groove (141) and the coupling projection (142) of the one of the first tightening bodies.

[0083] A pitch alignment portion having the same structure as the pitch alignment portion (141) of the first tightening unit described above can also be formed in the plurality of second reinforcing bar tightening members (61) forming the second tightening unit (60).

[0084] Fig. 11 illustrates another embodiment of a rebar coupler according to the present invention. In this embodiment, the same components as in the previously described embodiment are given the same drawing reference numerals, and a detailed description thereof is omitted.

[0085] Referring to the drawing, in the reinforcing bar coupler according to the present embodiment, the configuration of the second tightening unit (60) for joining the coupler body (20) and the second reinforcing bar (310) has substantially the same structure as the embodiment described above.

[0086] And the third tightening unit (70) for connecting the first reinforcing bar (300) to the first reinforcing bar connecting portion (30) of the coupler body (20) has an auxiliary reinforcing bar tightening member (71) having an auxiliary screw portion (72) formed on the outer surface thereof that is screw-connected with the first connecting screw portion (31) of the first reinforcing bar connecting portion (30) of the coupler body (20). A tapered connecting portion (73) is formed on the inner surface of the auxiliary reinforcing bar tightening member (71).

[0087] The above tapered joint (73) is formed in such a way that the second joint screw portion (41) formed in the second reinforcing bar joint portion (40) of the coupler body (20) is set in the same direction as the taper direction. A fifth joint screw portion (74) is formed on the inner surface of the above tapered joint (73).

[0088] The third tightening unit (70) is provided with third reinforcing bar tightening members (75) that are coupled to the ends of the first reinforcing bars (300) inserted into the tapered joints (73) of the auxiliary reinforcing bar tightening members (71). A sixth tapered coupling screw portion (76) is formed on the outer surface of the third reinforcing bar tightening member (75) so as to be coupled with the tapered joint portion (73). In addition, a third reinforcing bar gripping member (77) having the same pattern as the bead (300a) formed on the outer surface of the first reinforcing bar (300) is formed on the inner surface of each third reinforcing bar tightening member (75). In addition, the third reinforcing bar tightening members (75) can maintain a state of being coupled to the outer surface of the first reinforcing bar (300) by a third support ring (78) having elasticity.

[0089] In the embodiment described above, the third reinforcing bar tightening member (75) of the third tightening unit (70) is provided with a third moving interference exclusion unit (150), and the third moving interference exclusion unit (150) has substantially the same structure as the second moving interference exclusion unit (120).

[0090] That is, as illustrated in FIG. 6, the third moving interference exclusion unit (150) is configured such that the center (RT) of the radius of curvature of the central portion of the outer surface of the third tightening body (75a) of the third reinforcing bar tightening member (75) is spaced a predetermined distance from the center of the radius of curvature (CC) of the third reinforcing bar gripping portion (77) of the third tightening body (75a) toward the center of the outer surface of the third tightening body (75a). Since the outer surface of the third tightening body (75a) is formed in a tapered structure, the width (W) of the third tightening body (75a) becomes wider from the upper end to the lower end, and the eccentric radius of curvature becomes larger from the upper end to the lower end.

[0091] The connection action of the first and second reinforcing bars by the reinforcing bar coupler according to the present invention configured as described above is described as follows.

[0092] In order to interconnect the first reinforcing bar (300) and the second reinforcing bar (310) using the reinforcing bar coupler (10) according to the present invention, first, the first tightening unit (50) is coupled to the end of the first reinforcing bar (300). To this end, the first reinforcing bar tightening members (51) supported on the first support ring (53) are expanded in the radial direction and inserted into the end of the first reinforcing bar (300), and the bead (300a) located at the end of the first reinforcing bar (300) is coupled to the first reinforcing bar gripping member (54) formed on the inside of the first reinforcing bar tightening member (51).

[0093] In this process, if the two first reinforcing bar clamps (51) are misaligned by the beads (301) formed on the outer surface of the first reinforcing bar (300), the pitch of the third coupling screw portions (55) formed on the outer surface of the first reinforcing bar clamps (51) is aligned using the pitch alignment portion (140). For example, if the third coupling screw portions (55) formed on the outer surface of the two first reinforcing bar clamps (51) are misaligned, the insertion groove (141) of the pitch alignment portion (140) formed on one reinforcing bar clamp is coupled with the coupling projection (142) formed on the other reinforcing bar clamp in a state of being misaligned by one pitch.

[0094] In this way, since the lead-in grooves (141) are formed at the same interval as the pitch of the reinforcing bar clamping member (51), even if the joining projection (142) of one reinforcing bar clamping member and the lead-in groove (141) of the other reinforcing bar clamping member are joined with a one-pitch misalignment, the threads and grooves of the third joining screw portion (55) formed on the outer surface of the reinforcing bar clamping member (51) are aligned in a continuous state.

[0095] As described above, when the bonding of the beads (300a) to the first reinforcing bar gripping portions (54) of the first reinforcing bar tightening members (51) is completed, the first tightening members (51) are supported in close contact with the ends of the first reinforcing bars (300) by the first support ring (53).

[0096] In this state, the coupler body (20) is inserted into the end of the second reinforcing bar (310) that is connected to the first reinforcing bar (300). During the above insertion process, the coupler body (20) is positioned so that the second reinforcing bar connecting portion (40) is positioned at the top and the first reinforcing bar connecting portion (30) is positioned at the bottom.

[0097] In this state, the second tightening unit (60) is coupled to the end of the second reinforcing bar (310) in the same manner as described above so that the bead (310a) of the second reinforcing bar (310) is coupled to the second reinforcing bar gripping portion (64) of the second tightening members (61).

[0098] In this state, as shown in Fig. 12, the ends of the first and second reinforcing bars (300) (310) are brought into mutual contact with each other inside the coupler body (20), and the coupler body (20) is rotated so that the first coupling screw portion (31) of the first reinforcing bar connecting portion (30) and the third coupling screw portion (55) formed on the outer circumference of the first reinforcing bar tightening members (51) constituting the first tightening unit (50) are mutually screw-connected.

[0099] As described above, when the first coupling screw portion (31) of the coupler body (20) and the third coupling screw portion (55) formed on the outer surface of the first reinforcing bar clamps (51) of the first tightening unit (50) are coupled, as shown in FIGS. 12 and 13, the outer surface of the tightening body (51a) of the first reinforcing bar clamps (51) is formed non-circular by the first movement interference exclusion portion (110), so the coupling area (shaded area "A" in FIG. 12) between the screw thread of the first coupling screw portion (31) formed on the inner surface of the coupler body (30) and the screw thread of the third coupling screw portion (55) formed on the outer surface of the tightening body (50a) of the first reinforcing bar clamps (51) is from both sides ("X" position in FIG. 13) of the first tightening body (51a) to the center ("Y" position in FIG. 13). As time goes by, it gradually becomes larger. That is, on both sides of the outer circumference of the first tightening body (51a), the end of the screw thread of the third coupling screw part (55) of the first tightening body is kept apart from the base of the screw groove of the first coupling screw part (31), thereby securing a free space when the first reinforcing bar tightening member (51) moves toward the first reinforcing bar (300).

[0100] In addition, the fourth connecting screw portion (65) formed on the outer surface of the second reinforcing bar tightening members (61) of the second tightening unit (60) and the second connecting screw portion (41) formed in the tapered hollow portion of the second reinforcing bar connecting member (40) are screw-connected.

[0101] In this state, the second reinforcing bar (310) is rotated to rotate the second tightening unit (60) relative to the coupler body (20) so that the second coupling screw portion (41) of the coupler body and the fourth coupling screw portion (65) of the first reinforcing bar tightening member are mutually tightened.

[0102] At this time, the second coupling screw portion (41) and the fourth coupling screw portion (62) are formed as a multi-spiral so that the axial movement amount according to one pitch of rotation is greater than the axial movement amount according to one pitch of rotation of the first coupling screw portion (31) and the third coupling screw portion (55), so that incomplete coupling of the second reinforcing bar can be prevented, and the number of rotations of the second reinforcing bar (310) for coupling the coupler body (20) and the second tightening unit (60) can be relatively reduced.

[0103] In this process, the ends of the first and second reinforcing bars (300) (310) are maintained in a state of close contact with each other, and the spiral direction of the second coupling screw portion (41) and the fourth coupling screw portion (65) is formed opposite to the spiral direction of the first coupling screw portion (31) and the third coupling screw portion (55), so that the second tightening unit (60) and the first tightening unit (50) screw-connected with the coupler body (20) are subjected to an external force in a direction that causes them to move away from each other relatively.

[0104] Accordingly, as the tightening slope (56) formed on the screws of the third coupling screw portion (55) of the first reinforcing bar tightening member (51) moves relative to the guide slope (36) formed on the screws of the first coupling screw portion (31) of the coupler body (20), the first reinforcing bar tightening member (51) moves toward the center of the first reinforcing bar (300), thereby increasing the gripping force for the first reinforcing bar (300).

[0105] At this time, since the first moving interference exclusion part (110) is formed in the first reinforcing bar tightening member (51), as described above, a gap occurs between the ends of the screw threads on both sides of the third coupling screw part (55) formed on the outer surface of the first reinforcing bar tightening member (51) and the base of the screw groove of the first coupling screw part (31) of the coupler body.

[0106] That is, the first moving interference exclusion member (110) causes the central portion of the outer surface of the first tightening body (51a) to have a non-circular shape that protrudes compared to both sides, and that is, the center of the curvature radius (R2) of the outer surface of the first tightening body (51a) is positioned at a predetermined distance eccentrically toward the center of the outer surface of the tightening body (51a) with respect to the center (CC) of the curvature radius (R1) of the first reinforcing bar gripping portion (54) formed on the inner surface of the first tightening body (51a). Therefore, the outer surface of the first tightening body (51a) on which the third coupling screw portion (55) is formed has a shape in which the central portion thereof protrudes relatively compared to both sides.

[0107] Accordingly, the joining area (A) of the screw portion of the third coupling screw portion (55) and the screw portion of the first coupling screw portion (31) gradually narrows from the center portion (Y) of the first tightening body (51a) to both sides (X).

[0108] Accordingly, as described above, the screw coupling force between the coupler body (20) and the first tightening unit (50) causes the tightening slope (56) of the first tightening body to slide along the guide slope (36) of the first reinforcing bar coupling part, thereby moving the first reinforcing bar tightening member (51) toward the center of the first reinforcing bar (300). As the force in the normal direction to the transfer force toward the center of the first reinforcing bar (300) gradually decreases from the center of the outer surface of the first reinforcing bar tightening member (51) to both sides.

[0109] In this way, the reduction of the normal force to the central direction transfer force of the first reinforcing bar clamping member (51) can facilitate the movement of the central direction of the first reinforcing bar clamping member (51), which can ultimately increase the gripping force of the reinforcing bar.

[0110] And the clearance that occurs between the end of the screw thread of the third coupling screw portion (55) on both sides of the first tightening body and the base of the screw groove of the first coupling screw portion (31) can minimize interference that occurs when the screw of the third coupling screw portion (55) and the screw of the first coupling screw portion (31) slip.

[0111] The second coupling screw portion (41) of the second reinforcing bar joint portion (40) of the coupler body (20) is formed to be tapered, and the fourth coupling screw portion (65) on the outer surface of the second reinforcing bar tightening member (61) of the second tightening unit (60) is formed to be tapered to correspond to the second coupling screw portion (41). Therefore, when the second coupling screw portion (41) and the fourth coupling screw portion (65) are screw-connected, the second reinforcing bar tightening member (61) moves along the taper to grip the second reinforcing bar (310).

[0112] At this time, since the second movement interference exclusion part (120) is formed in the second reinforcing bar tightening member (61), as shown in FIG. 14, the joining area (shaded area "A" in FIG. 14) of the screw threads of the second coupling screw part (41) and the fourth coupling screw part (65) gradually narrows from the center of the second tightening body (61a) (position "Y" in FIG. 14) to both sides (position "X" in FIG. 14). As in the operation in which the first reinforcing bar clamping member (51) described above moves toward the center of the first reinforcing bar (300), when the second reinforcing bar clamping member (61) moves toward the center of the second reinforcing bar (310), the normal force opposing the transfer force is reduced in both directions from the center of the outer surface of the second tightening body, thereby facilitating the movement of the second reinforcing bar clamping member (61) toward the center, and further reducing troubles in the screw joints of the second connecting screw portion (41) and the fourth connecting screw portion (65) due to the movement of the second reinforcing bar clamping member (61).

[0113] As described above, the reinforcing bar coupler (10) according to the present invention can increase the gripping force of the first and second reinforcing bars (300) (310) by the first and second tightening units (50) (60) that are screw-connected to the coupler body (20), and when the first and second reinforcing bars (300) (310) are in contact with each other and the coupler body (20) and the first and second tightening units (50) (60) are screw-connected, an external force due to the coupling force is applied in the direction that moves the first and second tightening units (50) (60) away from each other, so that the residual slip inherent in the reinforcing bar coupler (10) is eliminated. That is, the amount of residual slip according to the screw connection of the first coupling screw portion (31) and the third coupling screw portion (55) and the screw connection of the second coupling screw portion (41) and the fourth coupling screw portion (65), the amount of residual slip between the outer surface of the first reinforcing bar (300) coupled with the first reinforcing bar holding portion (54), and the amount of residual slip between the outer surface of the second reinforcing bar (310) coupled with the second reinforcing bar holding portion (64) can be removed during the connection work of the first and second reinforcing bars by the reinforcing bar coupler (10).

[0114] Therefore, even if a tensile force corresponding to the yield strength is applied to the first and second reinforcing bars connected by the reinforcing bar coupler, slip in the direction of separation of the first and second reinforcing bars can be fundamentally prevented.

[0115] Meanwhile, as shown in FIGS. 15 and 16, at least one first notch portion (131) forming a fourth movement interference exclusion portion (130) is formed on the first rebar gripping portion (54) of the first rebar clamping member (51) or the outer surface of the first rebar clamping member (51), and at least one second notch portion (136) forming a fifth movement interference exclusion portion (135) is formed on the second rebar gripping portion (64) of the second rebar clamping member (61) or the outer surface of the second rebar clamping member (61). Therefore, when the first and second rebar clamping members (51) (61) and the coupler body (20) are screw-joined to connect the first and second rebars (300) (310), the first and second rebar clamping members (51) (61) are elastically deformed or plastically deformed by the coupling force. It is possible to prevent both sides of the first and second reinforcing bar tightening members (51)(61) from interfering with the first connecting screw portion (31) and the second connecting screw portion (41).

[0116] To explain this in more detail, the ends of the first reinforcing bar (300) and the second reinforcing bar (310) connected by the coupler body (20) and the first and second reinforcing bar tightening members (51) are maintained in a state of close contact with each other, and the screw coupling force of the coupler body (20) and the first and second reinforcing bar tightening members (51) (61) increases due to the rotation of the coupler body (20) or the second reinforcing bar (310).

[0117] Accordingly, the guide slope (35) formed on the screws of the first coupling screw portion (31) and the tightening slope (53) formed on the screws of the third coupling screw portion (52) move relative to each other. At this time, both ends of the first reinforcing bar tightening member (51) moving toward the first reinforcing bar (300) receive a transfer force toward the center by the guide slope (36) and the tightening slope (56).

[0118] The transfer force toward the center and the transfer force toward the center at both edges of the first reinforcing bar clamping member (51) interfere with each other, but since the first notch portion (131) is formed in the longitudinal direction on the inner or outer side of the first reinforcing bar clamping member (51), the first reinforcing bar clamping member (51) plastically and elastically deforms in the circumferential direction of the first reinforcing bar (300), thereby resolving the interference.

[0119] This interference increases from the center of the outer surface of the first reinforcing bar clamping member (51) toward both sides, and is resolved by being deformed in a direction that surrounds the outer surface of the first reinforcing bar of the first reinforcing bar clamping member by the first notch portions (131) formed on at least one side of the inner or outer side of the first reinforcing bar clamping member (51).

[0120] Accordingly, interference caused by the first reinforcing bar tightening member (51) moving toward the center of the reinforcing bar is eliminated due to the screw connection force between the coupler body (20) and the first reinforcing bar tightening member (51), thereby increasing the gripping force of the first reinforcing bar (300).

[0121] And the second reinforcing bar tightening member (61) of the second tightening unit (60) coupled with the coupler body (20) moves along the tapered surface as the second coupling screw portion (41) and the fourth coupling screw portion (65) are screw-coupled to grip the second reinforcing bar (310). When the second reinforcing bar tightening member (61) moves, the external force that acts in a direction in which the radius of the second reinforcing bar tightening member (61) becomes smaller is eliminated as the second notch portion (136), which is the second movement interference exclusion portion (135), is deformed. Therefore, the gripping force according to the movement of the second reinforcing bar tightening member (61) can be increased.

[0122] As described above, the reinforcing bar tightening device according to the present invention and the reinforcing bar coupler using the same with no residual slip enable smooth movement according to the screw connection between the coupler body and the first and second reinforcing bar tightening devices, thereby increasing the gripping force of the first and second reinforcing bars and allowing the gripping force to be applied uniformly to each part.

[0123] And when the first and second reinforcing bars are connected by screwing the first and second reinforcing bar tightening members and the coupler body, the screw connection is made while the ends of the first and second reinforcing bars are in close contact, so the reaction force due to the screw connection is applied uniformly along the length direction to the coupler body. Therefore, when screwing and connecting the first and second reinforcing bars and the first and second reinforcing bar tightening members, the residual slip is eliminated, so the initial slip caused by the tensile force acting on the connected reinforcing bars can be reduced.

[0124] In addition, the rebar tightening device according to the present invention and the rebar coupler using the same can selectively connect the first and second tightening units by rotating the coupler body and increase the secondary bonding force by rotating the second rebar or the first rebar, thereby reducing the work required for connecting the first and second rebars and improving the workability of connecting the first and second rebars even in a narrow space.

[0125] While the present invention has been described with reference to the embodiments illustrated in the drawings, these are merely exemplary, and those skilled in the art will appreciate that various modifications and equivalent embodiments are possible. Therefore, the true scope of technical protection of the present invention should be determined by the technical spirit of the appended claims.

[0126] The reinforcing bar tightening device according to the present invention and the reinforcing bar coupler using the same with no residual slip can be widely applied not only to connecting reinforcing bars during reinforcement arrangement, but also to connecting pipes, bolts, shaped steel, rods, etc. used in various industrial facilities.

Claims

1. In a reinforcing bar coupler, a reinforcing bar clamping device is interposed between the coupler body and the reinforcing bar to be coupled and is coupled with a coupling screw formed on the inner surface of the coupler body to grip the reinforcing bar, A tightening body having a coupling screw portion formed on the outer surface to be coupled with the coupling screw portion of the coupler body and a reinforcing bar gripping portion formed on the inner surface to grip reinforcing bars; and A movement interference exclusion unit is provided to increase the gripping force of the rebar by eliminating movement interference when the tightening body moves toward the center of the rebar by the screw coupling force between the coupling screw portion of the coupler body and the coupling screw portion of the tightening body. A reinforcing bar coupler, characterized in that the above-mentioned movement interference exclusion section is configured such that the screw joint area between the coupling screw portion of the coupler body and the coupling screw portion of the tightening body gradually narrows from the center portion of the tightening body to both sides.

2. In paragraph 1, A reinforcing bar coupler, characterized in that the above movement interference exclusion part is set so that the center of the radius of curvature of the outer surface of the tightening body on which the coupling screw part is formed is spaced apart by a predetermined distance from the center of the radius of curvature of the inner surface of the tightening body on which the reinforcing bar grip part is formed in the direction of the center of the outer surface of the tightening body, so that the outer surface of the tightening body has a shape in which the center side protrudes compared to both sides.

3. In paragraph 1, A reinforcing bar coupler tightening member characterized in that the outer surface of the tightening body in which the above-mentioned moving interference exclusion section is formed has a radius of curvature that increases from the center to both sides, so that the outer surface of the tightening body has a non-circular shape in which the center protrudes more than the both sides.

4. In paragraph 1, A reinforcing bar tightening device for a reinforcing bar coupler, characterized in that a tightening slope is formed at an angle corresponding to the guide slope of the screw thread of the coupling screw portion of the coupler body on the screw threads of the coupling screw portion formed on the outer surface of the tightening body.

5. In paragraph 1, A reinforcing bar tightening device for a reinforcing bar coupler, characterized in that the coupling screw portion formed on the outer surface of the tightening body is tapered along the length direction at an angle corresponding to the coupling screw portion of the coupler body.

6. In paragraph 1, A reinforcing bar coupler tightening device characterized in that the above-mentioned movement interference exclusion part is configured by forming at least one notch portion in the longitudinal direction on the inner surface where the reinforcing bar gripping part of the tightening body is formed or on the outer surface where the coupling screw part is formed.

7. A coupler body having a first reinforcing bar joint having a first hollow portion and a first connecting screw portion formed on an inner surface thereof, and a second reinforcing bar joint having a second hollow portion extending from the first reinforcing bar joint and communicating with the first hollow portion, and a second connecting screw portion formed on an inner surface thereof; A first tightening unit having a plurality of first reinforcing bar tightening members, which are coupled to an end of a first reinforcing bar coupled to a first reinforcing bar connecting portion of the coupler body, and which has a first tightening body having a third coupling screw portion coupled to the first coupling screw portion formed on an outer circumference thereof and a first reinforcing bar gripping portion formed on an inner circumference thereof for gripping the first reinforcing bar; A second tightening unit having a plurality of second reinforcing bar tightening members, which are coupled to the end of the second reinforcing bar coupled to the second reinforcing bar connecting portion of the coupler body, and which has a second tightening body having a fourth coupling screw portion coupled to the second coupling screw portion formed on the outer circumference thereof and a second reinforcing bar gripping portion formed on the inner circumference thereof for gripping the second reinforcing bar; and The first and second movement interference exclusion parts are included to increase the gripping force of the first and second reinforcing bars by eliminating movement interference when the first and second tightening bodies move toward the center of the first and second reinforcing bars, respectively, by the screw coupling force of the first coupling screw part of the coupler body and the third coupling screw part of the first tightening body and the screw coupling force of the second coupling screw part of the coupler body and the fourth coupling screw part of the second tightening body. A reinforcing bar coupler characterized in that the first and second movement interference exclusion sections are configured such that the screw joint area between the first coupling screw portion and the third coupling screw portion and the screw joint area between the second coupling screw portion and the fourth coupling screw portion gradually narrow as they go from the center of the first and second tightening bodies to both sides.

8. In paragraph 7, A rebar coupler characterized in that the first and second movement interference exclusion sections are set so that the center of the radius of curvature of the outer surface of the first and second tightening bodies on which the third and fourth coupling screw sections are formed is spaced apart by a predetermined distance from the center of the radius of curvature of the inner surface of the first and second tightening bodies on which the first and second rebar gripping sections are formed, so that the outer surface of the first and second tightening bodies has a shape in which the central portion thereof protrudes more than the two sides.

9. In paragraph 7, A reinforcing bar coupler characterized in that the first and second movement interference exclusion sections are each set to have a radius of curvature of the outer surface of the first and second tightening bodies on which the third and fourth coupling screw sections are formed to become larger from the center toward both sides, so that the outer surface of the first and second tightening bodies has a non-circular shape in which the center protrudes more than the both sides.

10. In paragraph 7, A guide slope is formed on the screw thread of at least one of the first and second coupling screw portions of the coupler body, A reinforcing bar coupler characterized in that at least one of the third and fourth coupling screw portions formed on the outer surface of the first and second tightening bodies has a tightening slope formed at an angle corresponding to the guide slope.

11. In paragraph 7, At least one of the first and second coupling screw portions of the coupler body is tapered along the length direction at a predetermined angle, A reinforcing bar coupler, characterized in that at least one of the third and fourth coupling screw portions formed on the outer surface of the first and second tightening bodies is tapered along the length direction at an angle corresponding to the angle of the taper.

12. In paragraph 7, A reinforcing bar coupler characterized in that the first and second movement interference exclusion sections are formed by forming at least one notch portion in the longitudinal direction on the inner surface where the first and second reinforcing bar gripping sections of the first and second tightening bodies are formed, or on the outer surface where the third and fourth coupling screw sections are formed.

13. In paragraph 7, A rebar coupler characterized in that it further comprises a pitch alignment part for aligning the pitch of the third and fourth coupling screw parts of the first and second tightening bodies that are misaligned by the beads of the first and second reinforcing bars when the first and second reinforcing bars are connected to the first and second reinforcing bar gripping parts and the first and second reinforcing bars, respectively, formed on one of the tightening bodies and the other of the first and second reinforcing bar tightening parts.

14. In paragraph 13, A reinforcing bar coupler characterized in that the pitch alignment part is configured such that lead grooves are installed at the pitch interval of the third and fourth coupling screw parts on one edge of one of the tightening bodies, and coupling protrusions are formed at the pitch interval of the third and fourth coupling screw parts on the other edge of the other tightening body.

15. In paragraph 7, An auxiliary reinforcing bar tightening member is further interposed between the first reinforcing bar joint of the above coupler body and the first tightening unit or between the second reinforcing bar joint and the second tightening unit. An auxiliary screw portion is formed on the outer surface of the auxiliary reinforcing bar tightening member to be coupled to the first and second coupling screw portions of the coupler body, A reinforcing bar coupler characterized in that a connecting portion is formed on the inner surface of the auxiliary reinforcing bar tightening member to be connected to the third and fourth connecting screws of the first and second tightening units.

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