KR-102961019-B1 - ANTI-LOOSENING NUT FOR REINFORCING BAR

Abstract

By wrapping a spring member around a reinforcing bar from which the longitudinal projection has been removed and tightening a nut, the edge of the spring member presses against the curved portion formed at the part where the spiral projection protrudes, thereby elastically supporting the nut and preventing it from loosening from the reinforcing bar, the structure is simple, easy to tighten, and safe to use. In particular, by forming the cross-section of the spring member into a rectangular shape approximately the distance between the spiral projections, as the nut is tightened, the spring member is compressed and catches on the curved portion, undergoing elastic deformation to prevent the nut from loosening. This maintains a more robust fastening state, thereby preventing the tightening from coming undone. Additionally, by forming the opening of the nut slightly wider, the nut can be easily and safely inserted and tightened even if the spring member expands slightly when inserted into the end of the spring member.

Inventors

• 박수용

Assignees

• 주식회사 케이이알

Dates

Publication Date

20260507

Application Date

20230525

Claims (5)

1. In a lock nut for preventing loosening of a reinforcing bar (100) from which the length protrusions (120) have been removed, a spiral projection (110) is integrally formed in a spiral shape on the outer circumference and a length projection (120) is formed on both sides along the entire length based on the center. A spring member (200) having a square cross-section and a width section, which is inserted between the spiral protrusions (110) and wound by forcibly rotating one end of the rebar (100) and the spiral protrusions (110), and which is wound in a coil shape such that both edges are each stretched over the curved portions (111) formed protruding at the parts where the adjacent rebar (100) and the spiral protrusions (110) meet; and a nut (300) which is fastened to the rebar (100) by a screw fastening method and compresses the spring member (200) to forcibly press the curved portions (111); The inner diameter (D) of the coil shape of the spring member (200) is made smaller than the outer diameter (D') when the spiral projection (110) is not present on the reinforcing bar (100), so that the spring member (200) is forcibly spread out and wound around the reinforcing bar (100). The gap (W) between the coils of the spring member (200) is formed to be larger or smaller than the width (W') in the longitudinal direction of the reinforcing bar (100) at the spiral projection (110). The above nut (300) is a lock nut for preventing loosening of reinforcing bars, characterized in that the opening portion into which the spring member (200) is inserted is formed to be slightly wider than the outer diameter of the spring member (200).
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Description

Anti-loosening lock nut for reinforcing bar The present invention relates to a lock nut for preventing loosening of reinforcing bars, and more specifically, by wrapping a spring member around a reinforcing bar from which a spiral projection and a longitudinal projection have been formed, and then tightening a nut so that the edge of the spring member is placed over the curved portion formed when the spiral projection is formed to receive elastic support, the nut is configured to maintain a firmly tightened state without loosening from the reinforcing bar. Generally, since reinforcing bars used in reinforced concrete have a limited length, they are connected when reinforcing bars are placed in large floors or ceilings. The following (Patent Documents 1) to (Patent Documents 3) disclose a technology that allows two reinforcing bars to be connected at both ends in this manner. (Patent Document 1) Korean Registered Patent No. 10-1944735 The invention relates to a fastening device for a lock bolt cap and a deformed reinforcing bar, wherein the fastening device for a lock bolt cap and a deformed reinforcing bar comprises: a tip body having a through inner diameter formed so that a deformed reinforcing bar with a spiral protrusion can be inserted and positioned at the tip, and a fastening groove formed on the outer diameter; an expansion wing portion configured such that a plurality of anchoring wings extending from the coupling portion are spread out while the coupling portion is fixed to the fastening groove of the tip body by the coupling of an anti-detachment ring coupled to the coupling portion; and a double nut positioned at the lower part of the expansion wing portion through the fastening of the spiral protrusion formed on the deformed reinforcing bar, wherein the plurality of anchoring wings of the expansion wing portion are spread out and embedded in the ground while positioned in a hole drilled for ground reinforcement, thereby maintaining a firmly fixed state. The configuration includes a tip body, an expansion wing section, and a double nut that are inserted into a deformed reinforcing bar with a spiral protrusion. When inserted into a hole drilled for ground reinforcement, a plurality of anchoring wings are folded to the diameter of the drilled hole and inserted. When the deformed reinforcing bar reaches the target point of the drilled hole and is rotated, the double nut pushes up the plurality of anchoring wings of the expansion wing section. As the deformed reinforcing bar is pulled while the anchoring wings are unfolded, the anchoring wings are driven into the ground and fixed. This configuration allows for tensioning simultaneously with insertion into the drilled ground, thereby providing an immediate fixing effect. Furthermore, since resin or grouting processes required in conventional ground reinforcement are unnecessary, it is economical. Additionally, since curing is unnecessary, the construction period is significantly shortened, allowing it to contribute greatly to tunnel rock bolt and DC nail methods. In addition, it saves manpower and time by reducing the processes required for conventional ground reinforcement work, and is effective for environmental protection as it eliminates the use of conventional mortar filling. Furthermore, it enables efficient work by adjusting the unfolding angle of the anchoring wings according to the bore diameter. Moreover, by using double nuts, the unfolded state of multiple anchoring wings in the expansion wing section is maintained and loosening is prevented. Additionally, by configuring the ends of the multiple anchoring wings in a sawtooth shape with grooves, slip prevention and frictional force are increased during anchoring, enabling more robust anchoring. Finally, manufacturing costs can be reduced by minimizing the number of parts required for mounting the tip of the rock bolt. (Patent Document 2) Korean Registered Patent No. 10-0668434 The invention relates to a nut used for a rock anchor bolt or soil nailing bolt to fix a rock wall at risk of collapse in an excavated or steep slope using a compression plate, comprising a cone-shaped body having internal screw threads, and the body being divided into multiple parts, with an edge having a ring formed at the rear end, a sleeve having an internally inclined compression surface to receive and compress the edge and having screw threads formed on its outer surface, and a cap having screw threads formed on its inner surface to adjust the pitch of the sleeve, wherein an anti-detachment projection (23) is formed at the rear end of the sleeve and is bent inwardly to prevent the edge from detaching, or an anti-detachment flange is formed between the surface where the sleeve and the edge meet to prevent the edge from detaching, with an inwardly bent projection formed between the sleeve and the surface where the edge meets, wherein the cap adjusting the pitch of the sleeve is formed in a form that is open to the