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KR-102964566-B1 - Fish tail type expansion rebar coupler and construction method using the same

KR102964566B1KR 102964566 B1KR102964566 B1KR 102964566B1KR-102964566-B1

Abstract

The present invention relates to a mechanical joint connecting a reinforcing bar (R1) of an anchored reinforcing mesh (C-1) applied to a slab, wall, beam, mat foundation, etc., and a reinforcing bar (R1) of a pre-assembled reinforcing mesh (C-2), wherein even if a separation error occurs between the reinforcing bars (R1, R2), such separation error is easily absorbed to easily connect the reinforcing meshes (C-1, C-2), wherein two or more identical unit couplers (10) are gathered and combined to form a cylindrical body (M) in the shape of a fish in elevation; The outer surface (11) of the above unit coupler (10) is formed with a first tapered threaded portion (111) in which the diameter increases as it goes from one side, which is the snout portion (a), to the central portion, which is the body portion (b); a central portion (112) with a constant diameter in the central portion; a second tapered threaded portion (113) in which the diameter decreases as it goes from the central portion (112) to the tail portion (c), which is another side; and a third tapered threaded portion (114) in which the diameter increases again as it goes from the tail portion (c) to the tail fin portion (d); The inner surface (12) of the unit coupler (10) is formed with a coupling inner surface (12-1) having a constant diameter from the snout portion (a) to the tail portion (c) and a recess of the same shape formed on the surface to receive the rib (r) and node (l) of the reinforcing bar (R1, R2) or the thread (s) of the reinforcing bar, and an expanding inner surface (12-2) having a gradually increasing diameter from the tail portion (c) to the end of the tail fin portion (d); and is characterized by being composed of first and second nuts (30, 40) that are fastened to a cylindrical body (M) and have internal threads of the same pitch as the first to third tapered thread portions (111, 113, 114) of the unit coupler (10).

Inventors

  • 김광만

Assignees

  • (주)바로건설기술

Dates

Publication Date
20260513
Application Date
20250221

Claims (9)

  1. A reinforcing bar coupler used to connect reinforcing bars (R1) and (R2) by mechanical joining, When two or more identical unit couplers (10) are gathered and combined, they form a fish-shaped cylindrical body (M) in elevation; The outer surface (11) of the above unit coupler (10) is formed with a first tapered threaded portion (111) in which the diameter increases as it goes from one side, which is the snout portion (a), to the central portion, which is the body portion (b); a central portion (112) with a constant diameter in the central portion; a second tapered threaded portion (113) in which the diameter decreases as it goes from the central portion (112) to the tail portion (c), which is another side; and a third tapered threaded portion (114) in which the diameter increases again as it goes from the tail portion (c) to the tail fin portion (d); The inner surface (12) of the above unit coupler (10) is formed with a coupling inner surface (12-1) having a constant diameter from the snout portion (a) to the tail portion (c) and having a recess of the same shape formed on the surface to receive the ribs (r) and nodes (l) of the reinforcing bars (R1, R2) or the threads (s) of the reinforcing bars, and an expanding inner surface (12-2) having a gradually increasing diameter from the tail portion (c) to the end of the tail fin portion (d); Characterized by being composed of first and second nuts (30, 40) that are fastened to a cylindrical body (M) and have internal threads with the same pitch as the first to third tapered thread portions (111, 113, 114) of the unit coupler (10). Crucian carp tail-shaped expandable rebar coupler.
  2. In claim 1, When the reinforcing bars (R1, R2) are screw-type, the coupling inner surface (12-1) of the unit coupler (10) is characterized by having an intaglio formed with a screw thread pitch identical to the screw thread pitch of the reinforcing bars (R1, R2). Crucian carp tail-shaped expandable rebar coupler.
  3. In claim 1, In the case where the above reinforcing bars (R1, R2) are formed with ribs (r) and nodes (l), the ribs (r) are supported by an indentation formed in the width direction of the inner surface (12-1) of the cylindrical body (M), and the nodes (l) are supported by an indentation formed in the length direction. Crucian carp tail-shaped expandable rebar coupler.
  4. In claim 1, A ring spring (S1) is installed in a ring spring fixing groove (h1) formed at the end of the tail fin portion (d), so as to be able to temporarily maintain the shape of the cylindrical body (M) even if the diameter of the tail fin portion (d) becomes smaller or larger. Crucian carp tail-shaped expandable rebar coupler.
  5. In claim 1, The degree to which the snout portion (a) of the above-mentioned cylindrical body (M) opens to the maximum is determined by the size of the angle of inclination (θ) or by the change in the length (L) of the tail fin portion (d). Crucian carp tail-shaped expandable rebar coupler.
  6. In claim 1, The above reinforcing bars (R1, R2) are characterized by each being composed of a reinforcing bar (R1) of a first reinforcing mesh (C-1) that is anchored and a reinforcing bar (R2) of a second reinforcing mesh (C-2) that is pre-assembled and moved to be connected thereto. Crucian carp tail-shaped expandable rebar coupler.
  7. In claim 6, The above first and second reinforcing meshes (C-1, C-2) are characterized by being applied to columns, walls, beams, mat foundations, and slabs, Crucian carp tail-shaped expandable rebar coupler.
  8. (a) A step of temporarily fixing a rebar coupler in which a set of rebars (R1) according to claim 1 is inserted into a part of the inner surface (12-1) of the tail fin portion (d) of a cylindrical body (M) in which a first nut (30) is temporarily fitted, and then the rebars (R1) and the inner surface (12-1) are fitted so as to be in close contact; (b) a step of screwing the first nut (30) from the tail portion (c) to the end of the tail fin portion (d) to open the snout portion (a); (c) A step of inserting the reinforcing bar (R2) at the other end, to which the second nut (40) is temporarily fitted, into the open mouth portion (a) of the cylindrical body (M) and then fitting it into a part of the inner surface of the connection (12-1); (d) A step of fixing the two reinforcing bars (R1, R2) by screwing the first nut (30) of the tail fin portion (d) toward the central portion (112); (e) a step of moving the second nut (40) toward the central part (112) so that the two reinforcing bars (R1, R2) and the cylindrical body (M) are strongly fixed; characterized by being composed of Construction method using a carp tail-shaped expanding rebar coupler.
  9. In claim 8, The above reinforcing bars (R1, R2) are each applied to a first reinforcing mesh (C-1) that is anchored and a second reinforcing mesh (C-2) that is pre-assembled, transported, and connected thereto, and the first and second reinforcing meshes (C-1, C-2) are applied to columns, walls, beams, mat foundations, and slabs, respectively. Construction method using a carp tail-shaped expanding rebar coupler.

Description

Fish tail type expansion rebar coupler and construction method using the same The present invention relates to a fish-tail type expanding rebar coupler and a construction method using the same. More specifically, it relates to a rebar coupler used to connect a rebar mesh that has already been installed and anchored after transporting a rebar mesh pre-assembled in a factory to a construction site in the Off-Site Construction (OSC) method, which is an off-site construction method intended to reduce manpower at the construction site and shorten the construction period in the construction of reinforced concrete structures such as columns, walls, beams, mat foundations, and slabs. While there are various methods for connecting reinforcing bars at construction sites, the connection method using rebar couplers has advantages in terms of efficiency, constructability, and structural stability. Generally, a combination of column main reinforcement and tie reinforcement, beam main reinforcement and stirrups, slab main reinforcement including mat foundations, and wall main reinforcement and stirrups is called a preassembled rebar cage. The Off-Site Construction (OSC) method, which involves manufacturing such preassembled rebar cages in a factory to reduce labor at construction sites and then transporting and assembling them at the site, is preferred because it allows for stable quality assurance by manufacturing the structure separately in the factory and significantly shortens construction time due to minimal impact from external environmental factors such as weather. Rebar couplers, which are applied in the OSC method—a method of creating pre-assembled rebar mesh and assembling and installing it on-site—offer superior strength and constructability compared to welding or rebar overlap methods, and save installation space. They are a very effective method for large structures or when repetitive rebar assembly is required. As a prior art applying a pre-assembled rebar mesh, the rebar fastening device and method of a pre-assembly construction method using threaded rebars, disclosed in Korean Registered Patent Publication No. 2160937, is a rebar fastening device and method that allows the use of a threaded rebar structure pre-assembled in a factory during construction at a construction site. In the past, even if rebars were connected by couplers at the construction site, if the rebars were not fastened so that they came into contact with each other, the connected rebars would not only undergo deformation due to external impact but would also have difficulty withstanding the impact load. Furthermore, to eliminate the inconvenience of having to manufacture a separate assembly jig for pre-assembly, assemble the jig for each threaded rebar first, and then remove the jig after assembling the rebars at the construction site, a standardized round bar is placed between the lower and upper rebars to prevent deformation of the rebar connection points from external impact and to ensure good withstanding of external impact loads. The round bar serves to fill the gap when a gap occurs between the upper and lower rebars. The aforementioned pre-assembly device is transported for installation If any of the reinforcing bars in the pre-assembled rebar mesh become misaligned with the central axis of the reinforcing bars in the mesh pre-installed and anchored in the slab or wall, causing an error, this error cannot be accommodated, ultimately leading to a problem where the assembly of the rebar meshes as a whole becomes impossible. In addition, another prior invention, Korean Registered Patent Publication No. 0863974, a method for pre-assembling a reinforcing mesh for a reinforced concrete column, is intended to provide a reinforcing mesh for a reinforced concrete column that can stand on its own without installing additional support members by framing the reinforcing mesh, which is a reinforcing bar combination, using a reinforcing bar assembly jig, thereby allowing for convenient pre-assembly of the reinforcing mesh and enabling self-standing without installing additional support members. This is achieved by forming a guide portion having a tapered surface that extends from one end of the coupler body and decreases in diameter toward the coupler body side in a reinforcing bar coupler connecting reinforcing bars, thereby facilitating the connection of the anchoring reinforcing bar and the reinforcing mesh even if the central axes of the reinforcing bars constituting the reinforcing mesh connected to it do not align due to the guide portion having the tapered surface. In the case of the aforementioned prior invention, if the central axes of the anchoring reinforcing bar pre-installed due to the guide portion having the tapered surface and the reinforcing bars constituting the reinforcing mesh connected to it do not align to some extent, the error can be absorbed within the range of the guide portion having the tapered surface; however, if it