Fish tail type expansion rebar coupler and construction method using same

Abstract

The present invention relates to a fish tail type expansion rebar coupler, which is used to fasten rebars by mechanical joints so that, when unit couplers are combined, they form a cylindrical body in the shape of a fish, the rebar coupler comprising: a first tapered thread portion having an outer surface having a diameter increasing from the spout portion to the central portion; a second tapered thread portion having a central portion with a predetermined diameter at the central portion and having a diameter decreasing from the central portion to the tail portion; and a third tapered thread portion having a diameter increasing again from the tail portion to the tail fin portion; an inner surface comprising a coupling inner surface having a constant diameter from the spout portion to the tail portion and having intaglios for receiving ribs and joints or threads of rebars, and an expanded inner surface having a diameter increasing from the tail portion to an end of the tail fin portion; and first and second nuts fastened to the cylindrical body.

Description

Crucian carp tail-shaped expandable rebar coupler and construction method using the same

[0001] 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.

[0002] 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.

[0003] 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.

[0004] 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.

[0005] 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 rebars in the pre-assembled rebar mesh become misaligned with the central axis of the rebar 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.

[0006] 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 extends beyond the guide portion, the anchoring reinforcing bar and This has the problem that the reinforcing mesh intended for connection cannot be connected at all.

[0007] In addition, the pre-assembly method for reinforcing mesh disclosed in Korean Registered Patent Publication No. 1457114, which is another prior invention, is intended to prevent problems in connecting reinforcing mesh with reinforcing bars pre-installed in floor concrete by installing jigs, supports, and fixing brackets formed to the specifications of the reinforcing mesh when assembling the reinforcing mesh so that the reinforcing mesh is not altered and can be connected to the pre-installed reinforcing bars when erected with a crane, as the connection parts of the reinforcing mesh, in which each reinforcing bar, hoop, and stirrup are connected by a fastening line, become twisted and the reinforcing mesh cannot be restored to its original state. However, the aforementioned prior invention had the problem of not only requiring the cumbersome fabrication of jigs, supports, and fixing brackets every time to match the various specification changes of columns applied at the construction site, but also making it impossible to connect the reinforcing mesh at all if the centerlines of the reinforcing mesh and the pre-installed reinforcing bars do not align with each other.

[0008] This invention is made in consideration of the various conventional problems described above, and provides a method for connecting reinforcing bars of an anchored reinforcing mesh and reinforcing bars of a pre-assembled reinforcing mesh by mechanical joint when applying to slabs, walls, beams, mat foundations, etc., such as easily absorbing the spacing error between the reinforcing bars of the connected reinforcing meshes while ensuring smooth and robust assembly between the reinforcing meshes.

[0009] The present invention relates to a fish-tail-shaped expanding rebar coupler, which is a rebar coupler used to connect rebars by mechanical joining, wherein two or more identical unit couplers are assembled to form a cylindrical body in the shape of a fish in elevation; the outer surface of the unit coupler is formed with a first tapered thread portion in which the diameter increases from one side (the snout portion) to the central portion (the body portion), a central portion with a constant diameter in the central portion, a second tapered thread portion in which the diameter decreases from the central portion to the tail portion on the other side, and a third tapered thread portion in which the diameter increases again from the tail portion to the tail fin portion; and the inner surface of the unit coupler is formed with a coupling inner surface in which the diameter is constant from the snout portion to the tail portion and an engraving of the same shape is formed on the surface to receive the ribs and nodes of the rebar or the threads of the rebar, and an expanding inner surface in which the diameter gradually increases from the tail portion to the end of the tail fin portion. It is characterized by being composed of first and second nuts that are fastened to a cylindrical body and have internal threads with the same pitch as the first to third tapered thread portions of the unit coupler.

[0010] When the above reinforcing bar is of the screw type, the coupling inner surface of the unit coupler is characterized by having an intaglio formed with a screw thread pitch identical to the screw thread pitch of the reinforcing bar.

[0011] In the case where the above reinforcing bar is formed with ribs and nodes, it is characterized by having an indentation formed in the width direction of the inner surface of the cylindrical body that receives the ribs, and an indentation formed in the length direction that holds the nodes.

[0012] It is characterized by having a ring spring installed in a ring spring fixing groove formed at the end of the tail fin portion, so that the shape of the cylindrical body can be temporarily maintained even if the diameter of the tail fin portion becomes smaller or larger.

[0013] The degree to which the snout portion of the above-mentioned cylindrical body opens to the maximum is characterized by being determined by the size of the angle of inclination or the change in the length of the tail fin portion.

[0014] The above reinforcing bars are characterized by being composed of reinforcing bars of a first reinforcing mesh that are each anchored and reinforcing bars of a second reinforcing mesh that are pre-assembled to be connected thereto and then moved and connected.

[0015] The above first and second reinforcing meshes are characterized by being applied to columns, walls, beams, mat foundations, slabs, etc.

[0016] In addition, the present invention relates to a construction method using a fish tail-shaped expanding rebar coupler, characterized by comprising: (a) a step of temporarily fixing a rebar coupler in which one end of the rebar applied to the fish tail-shaped expanding rebar coupler described above is inserted into a part of the inner surface of the coupling with the tail fin portion of a cylindrical body in which a first nut is temporarily fitted, and then the rebar and the inner surface of the coupling are fitted in close contact; (b) a step of screwing the first nut from the tail portion to the end of the tail fin portion to open the snout portion; (c) a step of inserting the other end of the rebar in which a second nut is temporarily fitted into the opened snout portion of the cylindrical body and then inserting it into a part of the inner surface of the coupling; (d) a step of screwing the first nut of the tail fin portion toward the center portion to fix the two rebars; and (e) a step of moving the second nut toward the center portion to strongly fix the two rebars and the cylindrical body.

[0017] The present invention has the effect of easily connecting and fixing the reinforcing bars of a pre-assembled reinforcing mesh, which is transported and connected to a slab, wall, beam, mat foundation, etc., by mechanical joints, while easily absorbing such spacing errors even if spacing errors occur between the reinforcing bars.

[0018] In addition, even if the separation error occurring between the reinforcing bars of a pre-fixed reinforcing mesh and the reinforcing bars of a pre-assembled reinforcing mesh is large, the present invention is formed as a reinforcing bar coupler with a cylindrical body formed by combining multiple identical unit couplers, so when the cylindrical body is spread open, the end of the spreading cylindrical body becomes closer to a circular shape, thereby having the effect of absorbing errors occurring in various directions.

[0019] In addition, the present invention has the effect of being able to adjust the acceptable range for the separation error occurring between the reinforcing bars of the fixed reinforcing mesh and the reinforcing bars of the pre-assembled reinforcing mesh by adjusting the angle of inclination of the expanded inner surface formed in the tail fin portion of the unit coupler or the length of the tail fin portion.

[0020] In addition, the present invention has the effect of not only simplifying manufacturing but also reducing costs, as the unit couplers forming the cylindrical body are all formed as identical modules and the number of applicable parts is small.

[0021] In addition, the present invention has the effect of firmly connecting and fixing a pre-assembled reinforcing mesh and an anchored reinforcing mesh with only simple operation of the cylindrical body and the first and second nuts.

[0022] FIG. 1 is a perspective view of the present invention in which unit couplers are assembled together and a first nut is installed on a cylindrical body shaped like a crucian carp, which is a fish, in elevation.

[0023] FIG. 2 is a perspective view of FIG. 1 with a threaded reinforcing bar inserted into one side.

[0024] FIG. 3 is a perspective view of the unit coupler in an open state as the first nut in FIG. 2 screws to the end of the tail fin portion.

[0025] FIG. 4 is a perspective view of the open unit coupler of FIG. 3 with a threaded reinforcing bar inserted.

[0026] FIGS. 5 and 6 are perspective views of the state in which the first and second nuts in FIG. 4 are screwed toward the central portion, respectively, to bind the two reinforcing bars.

[0027] FIG. 7 is a perspective view of three unit couplers assembled together to form a cylindrical body.

[0028] FIG. 8 is a perspective view of the unit coupler applied to FIG. 1.

[0029] FIG. 9 is a partially enlarged perspective view of the caudal fin portion of the unit coupler of FIG. 8.

[0030] FIG. 10 is a side perspective view of FIG. 7

[0031] FIG. 11 is a perspective view of the unit coupler of FIG. 7 with a threaded reinforcing bar and a ring spring installed at the end of the tail fin portion.

[0032] FIG. 12 is a perspective view of FIG. 11 with a ring spring installed at the end of the mouth portion of the unit coupler.

[0033] FIG. 13 is a perspective view of a state in which, in the present invention, a rebar with ribs is inserted into a cylindrical body formed by gathering together unit couplers, each having an intaglio formed on its inner surface to receive the ribs and nodes of the rebar, and then another rebar with ribs is inserted into the cylindrical body that has opened as a first nut is screwed toward the end of the tail fin portion.

[0034] FIG. 14 is a perspective view of the state in which the first and second nuts in FIG. 13 are screwed towards the central portion, respectively, to bind the two reinforcing bars.

[0035] FIG. 15 is a perspective view of the unit coupler of FIG. 14 with rib reinforcement installed.

[0036] FIG. 16 is a perspective view of a unit coupler with the reinforcing bar of the rib removed in FIG. 15.

[0037] FIG. 17 is a partial perspective view of the state in which a first reinforcing mesh, pre-assembled for column reinforcing assembly in the present invention, is installed.

[0038] FIG. 18 is a perspective view of the state before the pre-assembled second reinforcing mesh is lifted and joined together, after the first reinforcing mesh, which is pre-assembled and fixed in FIG. 17, is installed with the mouth portion of the cylindrical body opened by means of a first nut at the end of the reinforcing bar, and the first reinforcing mesh is pre-assembled and fixed.

[0039] FIG. 19 is a perspective view of the first reinforcing mesh fixed in FIG. 18 and the pre-assembled second reinforcing mesh in a connected state.

[0040] FIG. 20 is a perspective view of the state before the pre-assembled second reinforcing mesh is joined together, after the mouth portion of the cylindrical body is opened by the first nut at the end of the reinforcing bar of the first reinforcing mesh for wall reinforcing assembly in the present invention.

[0041] FIG. 21 is a perspective view of the first reinforcing mesh and the second reinforcing mesh pre-installed in FIG. 20 in a connected and combined state.

[0042] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. However, in describing the present invention, descriptions of already known functions or configurations will be omitted in order to clarify the gist of the present invention.

[0043] The terms used in the specification of this invention are used merely to describe specific embodiments and are not intended to limit the invention.

[0044] FIGS. 1 to 6 sequentially illustrate the process of mechanically connecting the reinforcing bar (R1) of a fixed reinforcing mesh (C-1) and the reinforcing bar (R2) of a pre-assembled reinforcing mesh (C-2) that is transported and connected using the fish tail-shaped expanded reinforcing bar coupler of the present invention.

[0045] FIG. 1 is a perspective view of the present invention in which unit couplers are assembled together and a first nut is installed in a cylindrical body shaped like a fish (crucian carp) in elevation. In order to mechanically connect the reinforcing bar (R2) of a pre-assembled reinforcing mesh (C-2) transported to a construction site to the reinforcing bar (R1) of a reinforcing mesh (C-1) that is pre-installed and fixed in a slab, wall, beam, mat foundation, slab, etc., the first nut (20) is first temporarily fitted and installed in the cylindrical body (M).

[0046] The outer surface (11) of the unit coupler (10) forming the above cylindrical body (M) is formed with a first tapered thread portion (111) in which the diameter increases in a rounded convex shape as it goes from one side, the snout portion (a), to the central part, the body portion (b); a central portion (112) with a constant diameter in the central part; a second tapered thread portion (113) in which the diameter decreases in a rounded convex shape as it goes from the central portion (112) to the tail portion (c), which is another side; and a third tapered thread portion (114) in which the diameter increases again in a rounded convex shape as it goes from the tail portion (c) to the tail fin portion (d).

[0047] The cylindrical body (M) described in the present invention forms a fish shape in elevation when three identical unit couplers (10) are assembled and combined. In addition to three as shown in the drawing, the cylindrical body (M) can be formed by assembling two or four or more identical unit couplers (10). Since the opening of the mouth (a) of the cylindrical body (M) becomes closer to a circle as the number of applied unit couplers (10) increases, the process and effect of the operation of the cylindrical body (M) formed according to the number of unit couplers (10) are substantially the same, except that the error between the central axis of the reinforcing bar (R1) of the pre-fixed first reinforcing mesh (C-1) and the central axis of the reinforcing bar (R2) of the pre-assembled reinforcing mesh (C-2) can be absorbed more effectively even if such separation error occurs in various directions. Drawings or descriptions of the cylindrical body (M) according to changes in the number of unit couplers (10) are omitted.

[0048] FIG. 2 is a perspective view of FIG. 1 in which a threaded reinforcing bar is inserted and fitted into one side thereof. After one end of the threaded reinforcing bar (R1) is inserted into the tail fin portion (d) of the cylindrical body (M) in which the first nut (30) is temporarily fitted and into a part of the inner surface (12-1) of the connection, a reinforcing bar coupler is temporarily installed on the reinforcing bar (R1) so that the reinforcing bar (R1) and the inner surface (12-1) of the connection are in close contact. In order to temporarily maintain the shape of the cylindrical body (M) composed of unit couplers (10) and to simplify the installation work, a ring spring fixing groove (h1) is formed at the end of the tail fin portion (d), and a round ring spring (S1) with elasticity is fitted and installed therein.

[0049] FIG. 3 is a perspective view of the unit coupler in an open state as the first nut in FIG. 2 screws to the end of the tail fin portion,

[0050] The first nut (20), which is temporarily fitted into the cylindrical body (M), is screwed from the tail portion (c) to the end of the tail fin portion (d), causing the snout portion (a) to expand outward and spread apart. Among the outer surface (11) of the unit coupler (10) forming the cylindrical body (M), the tail fin portion (d) is formed with a third tapered thread portion (114) in which the diameter increases as it goes from the tail portion (c) to the end of the tail fin portion (d). Since the inner surface (12) of the unit coupler (10) is also formed with an expanded inner surface (12-2) in which the diameter gradually increases from the tail portion (c) to the end of the tail fin portion (d), the first nut (20), which is temporarily fitted into the cylindrical body (M), is screwed into the third tapered thread After being screw-coupled to part (114), as the screw moves toward the end of the tail fin part (d), the snout part (a) located on the opposite side of the tail fin part (d) opens up automatically.

[0051] FIG. 4 is a perspective view of the open unit coupler of FIG. 3 in which a threaded reinforcing bar is fitted. In order to connect the threaded reinforcing bar (R1) of one end, the reinforcing bar (R2) of the other end, on which a second nut (30) is temporarily fitted, is inserted into the open mouth portion (a) of the cylindrical body (M) so that the threaded reinforcing bar (R2) is fitted into a part of the inner surface (12-1) of the connection. In FIG. 4 and FIG. 5, the specific drawing of the second nut (30) is omitted because the fitting of the second nut (30) to the reinforcing bar (R2) varies depending on the installation site. For example, when the reinforcing bar (R2) is positioned vertically to be applied to a column, the second nut (30) can be installed by temporarily holding it to the reinforcing bar (R2) with a thin wire or the like, and when the reinforcing bar (R2) is applied to a beam, the second nut (30) simply needs to be inserted into the reinforcing bar (R2).

[0052] FIGS. 5 and 6 are perspective views of the state in which the first and second nuts in FIG. 4 are screwed towards the central part to bind the two reinforcing bars. The first nut (30) of the tail fin part (d) is screwed towards the central part (112) to fix the two reinforcing bars (R1, R2), and then the second nut (30) located on the opposite side is moved towards the central part (112) to strongly and firmly fix the two reinforcing bars (R1, R2) and the cylindrical body (M). The first and second nuts (20, 30) move by screwing into the second tapered threaded part (113), which becomes smaller in diameter as it goes from the central part (112) to the tail part (c), and the first tapered threaded part (111), which becomes larger in diameter as it goes from the snout part (a) to the central part (b).

[0053] The first and second nuts (30, 40) fastened to the cylindrical body (M) have internal threads with the same pitch as the first to third tapered thread portions (111, 113, 114) of the unit coupler (10), and the configuration in which the first and second nuts (20, 30) are screwed together with the second tapered thread portion (113, 111) and move is a generally widely known configuration, such as the screw coupling structure disclosed in the steel rod fastening structure of the present invention, which was filed and registered as Special Publication No. 0838962, so a detailed description thereof is omitted.

[0054] FIG. 7 is a perspective view of three unit couplers assembled together to form a cylindrical body, FIG. 8 is a perspective view of the unit coupler applied to FIG. 1, FIG. 9 is a partially enlarged perspective view of the tail fin portion of the unit coupler of FIG. 8, FIG. 10 is a side perspective view of FIG. 7, FIG. 11 is a perspective view of the unit coupler of FIG. 7 with a threaded reinforcing bar and a ring spring installed at the end of the tail fin, FIG. 12 is a perspective view of FIG. 11 with an additional ring spring installed at the end of the snout portion of the unit coupler.

[0055] In the present invention, the inner surface (12) of the unit coupler (10) forming the cylindrical body (M) has a rounded concave shape from the snout portion (a) to the tail portion (c), and a coupling inner surface (12-1) is formed on the surface with a shape that accepts the reinforcing bar (R1, R2) according to its external shape. When the connecting reinforcing bar (R1, R2) forms a rib (r) and a node (l) or a thread (s), the coupling inner surface (12-1) is formed with a rib (r') and a node (l') or a thread (s') of the same shape that accepts the reinforcing bar (R1, R2). When the reinforcing bar (R1, R2) is screw-type, the coupling inner surface (12-1) of the unit coupler (10) is formed with a thread pitch identical to the thread pitch of the reinforcing bar (R1, R2).

[0056] Additionally, from the tail portion (c) to the end of the tail fin portion (d), the expanded inner surface (12-2) is formed in the shape of a rounded concave surface with a gradually increasing diameter. The expanded inner surface (12-2) of the tail fin portion (d) forms an expanded rounded surface that gradually widens and expands from the end of the connecting inner surface (12-1) toward the end of the tail fin portion (d). As described above, the first nut (20) is screwed into the third tapered thread portion (114) formed on the outer surface of the tail fin portion (d) and moves screwed toward the end of the tail fin portion (d), causing the snout portion (a) to open up automatically.

[0057] That is, as shown in FIGS. 8 and 9, the degree to which the snout portion (a) forming the cylindrical body (M) opens is determined by the size of the angle of inclination (θ) or the change in the length (L) of the tail fin portion (d). The angle of inclination (θ) is an angle formed between the inclined surface formed by the expanding inner surface (12-2) that slopes and expands from the tail portion (c) toward the end of the tail fin portion (d), and the imaginary surface formed by the connecting inner surface (12-1) that extends straight toward the tail fin portion (d) through a rounded concave circumference. If the angle of inclination (θ) is made larger, the snout portion (a) opens further when the first nut (20) screws into the third tapered thread portion (114) and moves to the same length (L) of the tail fin portion (d) compared to before the angle of inclination (θ) is adjusted. Additionally, if the length (L) of the tail fin portion (d) is made larger As the screw moving hook of the first nut (20) becomes longer, the mouth portion (a) becomes wider.

[0058] In addition, as shown in FIGS. 11 and 12, a ring spring fixing groove (h1) is formed at the end of the tail fin portion (d) of the unit coupler (10), and an elastic ring spring (S1) is installed therein, so that the cylindrical body (M) can be inserted into the reinforcing bar (R1) for temporary work, and also, even if the diameter of the tail fin portion (d) is reduced or increased by moving the first nut (20), the shape of the cylindrical body (M) can be temporarily maintained.

[0059] In addition, to increase the number of unit couplers (10) forming the cylindrical body (M) or to make the cylindrical body (M) more stable and robust when installed on reinforcing bars (R1, R2), a ring spring fixing groove (h2) can be formed in the mouth portion (a) of the unit coupler (10), and an elastic ring spring (S2) can be additionally installed therein.

[0060] In the case where the reinforcing bars (R1, R2) applied in the present invention are of the screw type, the coupling inner surface (12-1) of the unit coupler (10) is configured with a screw pitch identical to the screw pitch of the reinforcing bars (R1, R2) to strengthen the coupling force between the members.

[0061] FIG. 13 is a perspective view of a cylindrical body in which a rebar with ribs is inserted and fitted into a cylindrical body formed by unit couplers having intaglio formed on the inner surface of the coupling to receive the ribs and nodes of the rebar in the present invention, and then another rebar with ribs is fitted into the cylindrical body that has opened as a first nut is screwed towards the end of the tail fin portion; FIG. 14 is a perspective view of FIG. 13 in which the first and second nuts are screwed towards the center portion respectively to bind both rebars together; FIG. 15 is a perspective view of FIG. 14 in which a rebar with ribs is installed in the unit coupler; and FIG. 16 is a perspective view of FIG. 15 in which the rebar with ribs is removed.

[0062] While the previous description explained through drawings that screw-type reinforcing bars (R1, R2) are connected to a cylindrical body (M), FIGS. 13 to 16 describe a connection of rib reinforcing bars (R1, R2) formed with ribs (r) and nodes (l) to a cylindrical body (10) composed of unit couplers (10). In order for the inner surface (12-1) of the unit coupler (10) to be connected to the ribs (r) and nodes (l) of the rib reinforcing bars (R1, R2), a recessed rib (r') is formed in the width direction of the inner surface (12-1) to receive the rib (r) in response, and a recessed node (l') is formed in the length direction to hold the node (l) so as to be connected. Depending on the fastening conditions, other fastening means that are generally widely applied may be added to make the connection between members easier or more robust, thereby allowing the shape of the recess to be changed to a different form. there is.

[0063] In the present invention, the only difference is that the inner surface of the connection (12-1) is modified as described above according to the rib reinforcing bars (R1, R2) formed with ribs (r) and nodes (l) and the screw-type reinforcing bars (R1, R2); since the other configurations are identical, the description of the rib reinforcing bars (R1, R2) is replaced by the description given above.

[0064] In order to reduce manpower at the construction site and shorten the construction period for reinforced concrete structures such as columns, walls, beams, mat foundations, and slabs, the present invention involves pre-fabricating a pre-assembled reinforcing mesh (C-2) in a factory, which is combined with reinforcing bars (R1) called main reinforcing bars or main reinforcing bars and stirrups (Rs1) called secondary reinforcing bars or stirrups, transporting it to the construction site, and then connecting it to the reinforcing bars (R1) of the pre-installed and anchored reinforcing mesh (C-1) through mechanical joints. This allows for the simple absorption of errors that occur when the reinforcing bars (R1, R2) are connected due to fabrication, transportation, or lifting, thereby ensuring smooth and robust assembly between the reinforcing meshes (R-1, R-2). Below, the reinforcing bars (R1, R2) installed in column and wall construction are described with drawings, but the same applies to other structures being constructed, such as beams, mat foundations, and slabs.

[0065] FIG. 17 is a partial perspective view of a first reinforcing mesh installed in a state in which it is pre-assembled and anchored for the assembly of column reinforcing bars in the present invention, FIG. 18 is a perspective view of a state in which the second reinforcing mesh, which is pre-assembled, is lifted and joined to each other after the mouth portion of the cylindrical body is opened by a first nut at the end of the reinforcing bar of the first reinforcing mesh anchored in FIG. 17, and FIG. 19 is a perspective view of a state in which the first reinforcing mesh anchored in FIG. 18 and the second reinforcing mesh, which is pre-assembled, are connected and joined together.

[0066] In the present invention, the first reinforcing mesh (C-1) that is pre-assembled and anchored, and the second reinforcing mesh (C-2) that is connected and coupled thereto, are composed of reinforcing bars (R1, R2) that mainly bear the stress and tie bars (Rs1, Rs2) that connect the reinforcing bars (R1, R2) to form a mesh body. The construction method using the fish tail-shaped expanded reinforcing bar coupler in the present invention is described step-by-step as follows.

[0067] First, (a) a step of temporarily installing a column reinforcing bar (R1) so that it is inserted into a part of the inner surface (12-1) of the tail fin portion (d) of the cylindrical body (M) in which the first nut (20) is temporarily inserted, and the reinforcing bar (R1) and the inner surface (12-1) are in close contact; wherein the first nut (20) is inserted into the cylindrical body (M) and temporarily positioned in the tail portion (a), and a ring spring (S1) is installed by inserting it into the ring spring fixing groove (h1) formed at the end of the tail fin portion (d) of the cylindrical body (M), so that when the cylindrical body (M) is installed on the reinforcing bar (R1, R2), the shape of the cylindrical body (M) is temporarily maintained, and the connection work can be done more quickly and easily.

[0068] Next, (b) a step of screwing the first nut (20) from the tail portion (c) to the end of the tail fin portion (d) to cause the snout portion (a) to open; wherein the internal space formed in the opened snout portion (a) is a space capable of absorbing the separation error that occurs between the reinforcing bars (R1, R2) when connecting the reinforcing bar (R2) of the other end column, and the range capable of absorbing the separation error also changes according to the change in the size of the opening of the snout portion (a).

[0069] Next, (c) a step of inserting the reinforcing bar (R2) of the other end of the column, into the open mouth portion (a) of the cylindrical body (M) so that the reinforcing bar (R2) of the column is inserted up to a part of the connecting inner surface (12-1); wherein, after the second nut (30) is temporarily inserted into the reinforcing bar (R2) of the other end of the column, the reinforcing bar (R2) of the column is inserted up to a part of the corresponding connecting inner surface (12-1) at a distance that allows the end of the reinforcing bar (R2) of the column to be connected to the cylindrical body (M).

[0070] Next, the connection is completed with the second reinforcing mesh (C-2), which is pre-assembled and transported to be joined with the first reinforcing mesh (C-1) composed of the pre-fixed reinforcing bars (R1) of the column, by passing through the steps of (d) screwing the first nut (20) of the tail fin portion (d) toward the central portion (112) to fix the reinforcing bars (R1, R2) of the two columns and the cylindrical body (M), and (e) moving the second nut (30) toward the central portion (112) to strongly fix the reinforcing bars (R1, R2) of the two columns.

[0071] In describing the construction method using the fish-tail type expanding rebar coupler of the present invention, the rebars (R1, R2) constituting the 1st and 2nd rebar meshes (C-1, C-2) were described above. It is obvious that the fish-tail type expanding rebar coupler of the present invention is applied to all connected rebars (R1, R2) constituting the 1st and 2nd rebar meshes (C-1, C-2) as shown in FIGS. 17 to 19.

[0072] In addition, the reinforcing bar (R1) of the first reinforcing mesh (C-1) that is fixed above and the reinforcing bar (R2) of the second reinforcing mesh (C-2) that is pre-assembled and transported to be connected thereto are primarily responsible for bearing the stress, and it is natural that the first and second reinforcing meshes (C-1, C-2) are applied to columns, walls, beams, mat foundations, slabs, etc.

[0073] FIG. 20 is a perspective view of the state before the pre-assembled second reinforcing mesh is joined to each other, after the mouth portion of the cylindrical body is opened by the first nut at the end of the reinforcing mesh of the first reinforcing mesh for the assembly of reinforcing bars of the wall in the present invention, and FIG. 21 is a perspective view of the state in which the first reinforcing mesh and the second reinforcing mesh installed in FIG. 20 are connected and joined, and the fish tail-shaped expanding reinforcing bar coupler of the present invention is applied to the first and second reinforcing meshes (C-1, C-2) constituting the reinforcing bars of the wall, and since this corresponds to being applied substantially the same to columns, walls, beams, mat foundations, slabs, etc. as previously explained, the explanation regarding this is substituted with the explanation above.

[0074] As described above, the present invention allows for the mechanical connection of a reinforcing bar (R1) of an anchored reinforcing mesh (C-1) and a reinforcing bar (R1) of a pre-assembled reinforcing mesh (C-2) applied to a slab, wall, beam, mat foundation, etc., by easily absorbing such a separation error even if a separation error occurs between the reinforcing bars (R1, R2), thereby easily connecting the reinforcing meshes (C-1, C-2). Furthermore, even if a separation error occurs between the reinforcing bars (R1, R2) of the reinforcing meshes (C-1, C-2) that are connected to each other, because the reinforcing coupler is formed as a cylindrical body (M) in which multiple identical unit couplers (10) are gathered and combined, when the cylindrical body (M) is spread apart, the end of the spreading cylindrical body (M) becomes closer to a circular shape, thereby having the effect of absorbing errors occurring in various directions.

[0075] In addition, the present invention can adjust the range of acceptance for the gap error occurring between the reinforcing bars (R1, R2) of the reinforcing mesh (C-1, C-2) connected to each other by adjusting the angle of inclination (θ) of the extended inner surface (12-2) formed in the tail fin portion (d) of the unit coupler (10) or the length (L) of the tail fin portion (d). Furthermore, since the unit coupler (10) forming the cylindrical body (M) is formed as a single module and the number of applied parts is small, it is easy to manufacture and the cost can be reduced. Moreover, it has the effect of more firmly connecting and fixing the reinforcing mesh (C-1, C-2) connected by simply operating the first and second nuts (20, 30) connected to the cylindrical body (M).

[0076] Although specific embodiments of the present invention have been described and illustrated above, the present invention is not limited to the described embodiments and can be applied to connections between individual reinforcing bars (R1, R2). Furthermore, it is obvious to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Accordingly, such modifications or variations should not be understood individually from the technical spirit or perspective of the present invention, and the modified embodiments should be considered to fall within the scope of the claims of the present invention.

[0077]

[0078] (Explanation of symbols)

[0079] 10: Unit coupler 11: Outer surface

[0080] 111: First tapered thread section 112: Central section

[0081] 113: Second tapered thread section 114: Third tapered thread section

[0082] 12: Inner surface 12-1: Bonding inner surface

[0083] 12-2: Extended inner surface 20: First nut

[0084] 30: 2nd Nut C-1: 1st Rebar Mesh

[0085] C-2: Second reinforcing mesh h1, h2: Ring spring fixing groove

[0086] S1, S2: Round spring M: Cylindrical body

[0087] R1, R2: Reinforcement bars Rs1, Rs2: Stirring bars

[0088] (a): snout (b): body

[0089] (c): Tail part (d) Tail fin part

[0090] (l): node (r): rib

[0091] (θ): Angle of inclination (s): Thread

Claims

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 expanded 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 expanded rebar coupler.

Images