KR102151795B1 - Rebar Joint Coupler Manufacturing Method and Rebar Joint Coupler Manufactured by the Manufacturing Method - Google Patents

Abstract

The present invention relates to a rebar connection coupler manufacturing method and a rebar connection coupler manufactured thereby and, more specifically, to a rebar connection coupler manufacturing method capable of manufacturing a rebar connection coupler through plasticization without a mechanical machining process, thereby increasing economic feasibility with a reduction in time for manufacturing and a drop in the number of defects during a manufacturing procedure, and increasing stability with an improvement in durability against fatigue stress and fatigue fracture without a deterioration in durability caused by mechanical machining, and a rebar connection coupler manufactured thereby. To achieve the purpose, the rebar connection coupler manufacturing method includes: a tube cutting step of cutting a cylindrical tube having both open ends in accordance with design standards; a dividing plate lead-in step of leading a dividing plate dividing an internal space of the tube into the tube; a primary tube fixing step of fixing one end of the tube to a first fixing mold; a primary component lead-in step of leading an elastic spring, a shell guide and a shell in sequence into one of a pair of internal spaces divided by the dividing plate; a primary plasticization step of pressing one side, in which the elastic spring, the shell guide and the shell are led, through a pressing mold; a secondary tube fixing step of fixing one side of the tube, which is completely plasticized, to a second fixing mold; a secondary component lead-in step of leading an elastic spring, a shell guide and a shell in sequence into the other one of a pair of the internal spaces divided by the dividing plate; and a secondary plasticization step of pressing one side, in which the components are led through the secondary component lead-in step, through the pressing mold.

Description

Rebar Joint Coupler Manufacturing Method and Rebar Joint Coupler Manufactured by the Manufacturing Method

The present invention relates to a method for manufacturing a reinforcing bar joint coupler and a coupler for reinforcing bar joints manufactured by the above manufacturing method, and more particularly, to manufacturing a coupler for reinforcing bar joints through plastic processing without a mechanical processing process. A method of manufacturing a coupler for rebar joints that improves stability by reducing the time required and reducing the occurrence of defects in the manufacturing process to increase economic efficiency, and without fear of reduction in durability due to machining, and improved durability against fatigue failure and fatigue stress, and the above manufacturing It relates to a coupler for reinforcing bar joints manufactured by the method.

In general, the shape and number of reinforced bars used to form a reinforced concrete structure are determined depending on the shape and length (height) of the concrete structure.

Here, rebars are cut to a certain length at a rebar manufacturing plant, and then bundled into a bundle and supplied to the construction site, and cut to the required length at the construction site or fixed by a bundle means such as wire, etc. Used.

However, the conventional fixing method using a wire takes a lot of work time because the operator is performed manually, and the strength of the binding portion is changed according to the skill of the operator, so that it is difficult to guarantee workability.

Among the techniques proposed to solve the above problems, there is a coupler for reinforcing bar joints that are used when reinforcing bars are extended in the longitudinal direction, and a cylindrical body with both ends in the longitudinal direction open and at the side ends that are arranged inside the body It includes a fastening piece that tightens and fixes the outer circumferential surface of the reinforcing bar.

Among the technologies disclosed as a coupler for reinforcing bar joints, Korean Utility Model No. 20-0321183 is formed into a semicircular body to form a number of nodal grooves on the inner periphery and tapered the outer periphery to connect the inner outer periphery of the end of the reinforcing bar. It can be fastened with a pair of fastening pieces that are respectively coupled to each other, a joint coupler having a tapered hole formed on one side of the inner side and female threads on the other inner circumference so that the fastening piece can be inserted inside, and a female screw of the coupling coupler. It includes a coupling coupler that forms a male screw on one side of the outer periphery so that a taper hole is formed so that the fastening piece can be inserted therein, so that both ends of the reinforcing bar that are connected when combined with the coupling coupler are in close contact with each other.

In addition, Republic of Korea Patent No. 10-1880117 relates to a'one-touch rebar coupler', and when a rebar is inserted into the rebar coupler by installing a stopper inside the locking coupling part provided in the rebar coupler, external foreign matters are not inside the rebar coupler. To prevent penetration, it includes a coupler housing, a locking coupling part, a plug part, an elastic member, and a closing cap part, and the elastic members are installed on the left and right sides of the locking coupling part, respectively, to the left and right of the locking coupling part. It is configured to apply elastic force to the left and right sides of the partition wall inside the coupler housing, and the elastic force of the elastic member is used to couple the first and second reinforcing bars and the locking joint.

On the other hand, among the prior art proposed as a method of manufacturing a coupler for rebar joints, there is Korean Patent Registration No. 10-1765569 (registered on August 1, 2017), and the method of manufacturing a coupler for rebars proposed in the tightening technology is a cylindrical shape. Inserting filler material into the inner circumferential surface of the fastening hole formed inside the body of the body, manufacturing a compression ring that is inserted into the first body part and the second body part respectively formed on both sides of the body to fix the reinforcing bar, on the fastening hole Inserting a compression ring and heating the filler material to a temperature at which the filler material is melted by a heating means to join the body and the compression ring.

That is, after inserting the filler material into the inner circumference of the fastening hole formed inside the body, after inserting a plurality of compression rings into the fastening hole, heat is applied from the outside to melt the filler material, and then the compression ring and the body are integrally fixed and cooled. A fastening hole for the compression ring must be formed, the filler material must be inserted into the fastening hole formed inside the body, and a plurality of compression rings must be placed in the correct position on the fastening hole where the filler material is inserted, and heat from the outside while maintaining the arrangement. The manufacturing process is complicated because it has to be integrally bonded by applying a compound, and when the compression ring is moved out of position due to vibration or impact during manufacturing, defects occur, so the probability of occurrence of defects is very high, and economy is low.

In addition, looking at the manufacturing method of the coupler proposed in the method of manufacturing a coupler for rebar joints proposed in Korean Patent Registration No. 10-2033282 (registered on Oct. 10, 2019), material warehousing, forging, cold forging processing, MCT/shelf It includes the steps of processing, heat treatment (vacuum/carburizing), and inspection/shipment.

The manufacturing method of the prior art has problems such as an increase in manufacturing time and an increase in manufacturing cost due to this, since a process required to process a part is essentially required.

Korean Patent Registration No. 10-1765569 (2017.08.01., registered) Korean Patent Registration No. 10-2033282 (Registration on October 10, 2019)

The present invention has been proposed to solve the above problems, a manufacturing method for manufacturing a coupler for reinforcing bar joints through plastic processing without mechanical processing steps such as cutting, cutting, forging, etc., and manufactured through the manufacturing method. It is an object to provide a manufacturing method for manufacturing a coupler for reinforcing bar joints having high economic advantages by reducing the time and cost required for processing by providing a coupler for reinforcing bar joints, and to provide a coupler for reinforcing bar joints manufactured through the above manufacturing method. .

In addition, since there is no processing such as cutting or cutting as described above, it is possible to provide a coupler for reinforced joints with high durability against fatigue failure and fatigue stress of a reinforced joint coupler, thereby extending the life of reinforced concrete structures. An object of the present invention is to provide a manufacturing method for manufacturing a joint coupler and a coupler for reinforced joints manufactured through the manufacturing method.

In order to achieve the above object, the present invention,

A tube cutting step of cutting a cylindrical tube with open ends according to a design standard;

A partition plate drawing step of introducing a partition plate partitioning an inner space of the tube into the tube;

A primary tube fixing step of fixing one end of the tube to a first fixing mold;

A primary component retrieval step of sequentially inserting an elastic spring, a flat body guide, and a flat body into any one of the pair of inner spaces partitioned by the partition plate;

A first firing step of pressing the elastic spring, the piece guide, and one side into which the piece is inserted through a pressing mold;

A secondary tube fixing step of fixing one side of the sintered tube to the second fixing mold;

A secondary component retrieval step of sequentially introducing an elastic spring, a flat body guide, and a flat body into the other of the pair of inner spaces partitioned by the partition plate;

And a second firing step of pressing the one side into which the part is inserted through the second part drawing step through a pressurizing mold.

In addition, the first firing step and the second firing step include a pressurizing step of pressurizing the pressurizing mold for 5 to 7 seconds (sec) at a pressure of 190 to 200 tons (ton), and for pressurizing in the pressurizing step. A separation step is further provided for separating the tube in close contact with the mold from the pressurizing mold,

The separating step is characterized in that the tube in close contact with the pressing mold is separated by supplying a pressure of 45 to 50 tons to the pressing mold.

In addition, in the secondary tube fixing step, in the second fixing mold, one side of the tube fired through the primary firing step is fixed, but the tube is prevented from being damaged by the pressure transmitted during the secondary firing step. It characterized in that the buffer member is further disposed for.

Subsequently, the tube cut in the tube cutting step is characterized in that the Rockwell hardness (HRC) is 30 or more.

And, by providing a coupler for reinforcing bar joints manufactured through the above steps, manufacturing time is shortened, manufacturing cost is lowered, and a coupler for reinforcing bar joints is provided with improved durability and stability.

The present invention made as described above, in the process of manufacturing a coupler for rebar joint

Since there is no mechanical processing such as cutting or cutting, the manufacturing process and time can be shortened, thereby lowering the production cost, thereby improving economic efficiency.

In addition, by manufacturing a coupler for reinforcing bar joints through plastic processing, it has a high resistance to fatigue fracture and fatigue stress, so that the service life is long, the service life of the reinforced concrete structure is extended, and stability is improved.

1 is an exemplary view showing a method for manufacturing a reinforcing bar joint coupler according to the present invention.
Figure 2 is a schematic diagram showing a method of manufacturing a coupler for reinforcement joint according to the present invention.
Figure 3 is an exemplary view showing a coupler for reinforced joints manufactured through the method for manufacturing a coupler for reinforced joints according to the present invention.

Hereinafter, other objects and features of the present invention in addition to the above objects will be clearly revealed through the description of the embodiments with reference to the accompanying drawings.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in this application. Does not.

Hereinafter, with reference to the accompanying drawings to describe a preferred embodiment of a method for manufacturing a reinforcing bar joint coupler according to the present invention and a coupler for a reinforcing bar joint manufactured through the manufacturing method.

First, the manufacturing method (S1) of the coupler for reinforcing bar joint according to the present invention, FIGS. 1 and 2

As shown in the tube cutting step (S10), the partition plate pulling step (S20), the first tube fixing step (S30), the first parts pulling step (S40), the first firing step (S50) and , A secondary tube fixing step (S60), a secondary component receiving step (S70), and a secondary firing step (S80).

The tube cutting step (S10) is a step of cutting the tube constituting the outer body of the reinforced joint coupler, and a cylindrical tube with open both ends is cut according to a design standard.

In the present invention, the tube is cut according to the design standard of a cylindrical tube extending in the longitudinal direction. Here, the design standard is the length of the final manufactured rebar joint coupler at the design stage, and the design standard is according to the diameter of the rebar to be joined. Changes.

For example, when the diameter of the reinforcing bar to be coupled is 26 mm, the total length of the reinforcing bar coupler may be 150 mm.

Meanwhile, in the present invention, the tube is made of a metal material having durability and corrosion resistance, and is preferably formed of a metal including an alloy having a Rockwell hardness (HRC) of 30 or more.

Rockwell hardness is one of the methods of indicating the hardness of a work material. It is the hardness of a hole created by pressing a steel bead or diamond awl on a test material with a hydraulic pressure.

In the present invention, a tube is formed of a material having a hardness of 30 or more to prevent damage during firing in the first and second firing steps described later, and at the same time, the hardness of reinforced and hardened concrete in a state placed in a reinforced concrete structure. By having a hardness that is not relatively low compared to, it does not impair the durability of reinforced concrete structures.

At this time, the hardness of the tube is used with a Rockwell hardness of at least 30. If the Rockwell hardness is less than 30, there is a problem that it is damaged during the firing process or is unsuitable for use in reinforced concrete structures, and if the material has a Rockwell hardness of 40 or more, durability is improved. Although there is an advantage, there is a problem in that the price of the firing device is relatively high, and the pressure required for firing in the first firing step and the second firing step increases, and thus the volume of the firing device is increased, and thus price competitiveness is lowered.

Accordingly, the tube of the present invention can be made of a material having a Rockwell hardness of at least 30 and a maximum of less than 40, thereby lowering the manufacturing cost and manufacturing a tube having high durability.

The partition plate retracting step (S20) is a step of introducing a partition plate for partitioning the inner space of the tube into the tube, wherein the partition plate has a flat plate shape and divides the inner space of the tube into a plurality of independent spaces.

Such a partition plate is preferably arranged in the center of the length direction in the inner space of the tube, which allows reinforcing bars to be pulled in at the same length from both open side ends of the tube and pulled in at the first part pulling step (S40) to be described later. One end of the elastic spring abuts and the end of the reinforcing bar inserted into the tube abuts and is supported.

In the present invention, the tube and the partition plate are separately molded and then the partition plate is inserted into the tube. However, the tube and the partition plate may be formed integrally with the inside of the tube.

The primary tube fixing step (S30) is a step of fixing one end of the tube into which the partition plate is inserted to the first fixing mold, and in the first fixing mold, one end of the tube is inserted to fix the tube.

This first fixing mold prevents the position of the tube from being changed by the firing pressure generated in the first firing step (S50) to be described later. To this end, the first fixing mold may be in the form of a box in which an insertion hole into which a tube is inserted, or a jig form with a plurality of fixing jigs surrounding and fixing the outer circumferential surface of the tube, for convenience of operation and reduction of working time. For the purpose, it is preferable that the tube is inserted into a box shape having an insertion hole.

The first component retracting step (S40) is a step of sequentially introducing an elastic spring, a flat body guide, and a flat body into the inside of the tube fixed to the first fixing mold.

The elastic spring, the braid guide and the braid are components constituting a known coupler for reinforcing bar joints, and briefly described for this are as follows.

The elastic spring elastically supports the knitted body and the knitted body guide so that the knitted body and the knitted body guide are in close contact with the reinforcing bar in the process of entering or in the state of entering the reinforcing bar.

The elastic spree is first introduced into the tube, and one end is introduced so as to contact the partition plate disposed in the tube.

The knitting guide is a circular ring and a plurality of protrusions radially disposed on the ring, and is for stably placing the position of the knitting body in the tube before the reinforcing bar enters the tube.

The piece is composed of a plurality of pieces and receives the elastic force of the elastic spring to allow reinforcing bars to be drawn in, and the inner circumferential surface abuts against the outer circumferential surface of the rebar, and the outer circumferential surface abuts against the inner circumferential surface of the tube to fix the reinforced.

Here, the knitted guide and the knitted body can be separately inserted into the tube, but it is also possible to insert the knitted guide and the knitted body into the tube after assembling the knitted guide and the knitted body from the outside.

Next, the first firing step (S50) is a step of pressing one side of the tube into which the parts are inserted through a pressing mold, wherein the pressing mold is a step of pressing one side of the tube according to the designed standard.

That is, in the present invention, the shape of the tube is processed by plastic working the tube after inserting the component into the cylindrical tube. Here, the first firing step (S50) and the second firing step (S80) to be described later use a swage processing method in which a part of the outer shape and outer diameter of the tube is linearly processed, and a pressing mold for the same.

The swaging processing method is one of forging processing methods in which a metal material is compressed or molded, and a bar is pressed with a tool while rotating on an anvil to widen or deform the cross section of a part or the whole.

In the first firing step (S50), a pressurizing step (SP) of pressurizing the pressurizing mold at a pressure of 190 to 200 tons (ton) for 5 to 7 seconds (sec), and a pressurizing step (SP) It further includes a separation step (SE) for separating the tube in close contact with the mold from the pressing mold.

Here, the separation step (SE) is to separate the tube in close contact with the pressing mold by supplying a pressure of 45 to 50 tons (ton) to the pressing mold. At this time, the pressing step (SP) and the separating step (SE) are included in the first firing step (S50) and the second firing step (S80), respectively.

In the pressurization step (SP), the pressure of the pressurizing mold is pressurized by a pressure of 190 to 200 tons (ton) for 5 to 7 seconds (sec), and if the pressure is less than 190 tons, a material having a Rockwell hardness of 30 or more is used. There is a problem in that the pressure required for plastic deformation of the formed tube cannot be supplied, and when the pressure required for plastic deformation exceeds 200 tons, since the pressure required for plastic deformation is excessively supplied, there is a problem that the area to be plastically deformed is compressed and the thickness is reduced or crushed.

In addition, when the pressure is limited to the range of 5 to 7 seconds, plastic deformation does not proceed smoothly if it is less than 5 seconds, and if it exceeds 7 seconds, plastic deformation is excessive, causing damage to the tube. Because.

One side of the tube is molded according to the designed standard through the first firing step (S50) made as described above.

In general, couplers for rebar joints are formed to have a diameter that gradually narrows toward the open end from the center, which fixes the position of the reinforced rebar while the outer circumferential surface of the inner circumferential surface of the inner circumferential body disposed therein contacts the inner circumferential surface of the tube. For this purpose, the shape of the tube should be formed such that the diameter of the open end is relatively smaller than that of the center, and more preferably, it should be formed in a shape corresponding to the outer circumferential surface of the knitted body disposed inside.

Conventionally, for this purpose, a processing method such as cutting or cutting a tube has been used, but there are problems such as a long time required for cutting or cutting, and defects or thickness deviations occur during processing.

In the present invention, by forming the shape of the tube through plastic deformation using the swaging method as described above, the time required for molding is shortened and the occurrence of defects in the forming process is minimized, so that price competitiveness is high, and the thickness of the tube in the deformation process Equally

Since it is formed, there is an advantage in solving problems such as occurrence of defects and decrease in durability due to thickness variation.

The next secondary tube fixing step (S60) is a step of fixing one side of the tube that has completed the first firing step (S50) to the second fixing mold, where the second fixing mold performs the first firing step (S50). The tube is stably fixed in the form of a box with an insertion hole through which one side of the tube whose shape is deformed is inserted.

However, the second fixing mold may be further provided with a buffer pad to prevent one side of the tube molded in the first firing step (S50) from being damaged by the pressure generated during the second firing.

The buffer pad is formed by synthesizing any one of rubber, urethane, and silicone, or a plurality of them, and is disposed in an insertion hole into which the tube is inserted in the second fixing mold or on a contact surface in contact with the tube, which occurs during the secondary firing step. This is to prevent damage to the tube by colliding the tube with the second fixing mold by pressure.

The next secondary component retrieval step (S70) is a step of retracting an elastic spring, a piece guide, and a piece into the tube in the same manner as in the primary part-in step (S40). Since it is the same as, repeated description will be omitted.

The secondary firing step (S80) is a step of plastic processing the tube into which the parts are inserted through the secondary component retrieval step (S70) and is the same as the primary firing step (S50), so a repeated description will be omitted.

The present invention made as described above provides a manufacturing method for manufacturing a coupler for reinforcing bar joints, but since mechanical processing such as cutting and cutting is not required, the manufacturing process can be shortened, the manufacturing time can be reduced, and the defect rate can be lowered. It has the advantage of lowering the manufacturing cost.

In addition, by processing the tube through the swaging method in the 1st firing step and the 2nd firing step, it is possible to provide a tube with no thickness deviation.Through this, it is for rebar joints that can improve the durability of reinforced concrete structures. A coupler 1 can be provided.

As shown in Figure 3, the reinforcing bar joint coupler 1 manufactured through the manufacturing method according to the present invention is formed so that the diameters of both open ends are relatively small compared to the center. Through the second firing step and the second firing step, it has a uniform thickness through the swaging method, so that even when pressure is applied from the outside, it is distributed and supported, thereby having the advantage of high resistance to fatigue failure and fatigue stress.

As described above, in the present invention, specific matters such as specific components, etc., and limited embodiments and drawings have been described, but this is provided only to help a more general understanding of the present invention, and the present invention is not limited to the above embodiments. , If a person of ordinary skill in the field to which the present invention belongs, various modifications and variations are possible from these descriptions.

Therefore, the spirit of the present invention is limited to the described embodiments and should not be defined, and all things that are equivalent or equivalent to the claims as well as the claims to be described later belong to the scope of the spirit of the present invention. .

S1: Manufacturing method of coupler for rebar joint
S10: Tube cutting step
S20: Partition plate entry step
S30: 1st tube fixing step
S40: 1st part delivery step
S50: 1st firing step
S60: Secondary tube fixing step
S70: Second part input step
S80: 2nd firing step
1: Coupler for rebar joint

Claims (5)

A tube cutting step (S10) of cutting a cylindrical tube with open ends according to a design standard;
A partition plate pulling step (S20) of introducing a partition plate partitioning the inner space of the tube into the tube;
A primary tube fixing step (S30) of fixing one end of the tube to a first fixing mold;
A primary part retrieval step (S40) of sequentially inserting an elastic spring, a flat body guide, and a flat body into any one of the pair of inner spaces partitioned by the partition plate;
A first firing step (S50) of pressing the elastic spring, the piece guide, and one side into which the piece is inserted through a pressing mold;
Secondary tube fixing step (S60) of fixing one side of the sintered tube to the second fixing mold;
A secondary component retrieval step (S70) of sequentially inserting an elastic spring, a flat body guide, and a flat body into the other of the pair of inner spaces partitioned by the partition plate;
Including; a second firing step (S80) of pressing the one side of the part is inserted through the second part pulling step (S70) through a pressing mold;
In the first firing step (S50) and the second firing step (S80),
A pressing step (SP) of pressing each of the pressing molds at a pressure of 190 to 200 tons (ton) for 5 to 7 seconds (sec),
A separation step (SE) for separating the tube in close contact with the pressing mold from the pressing mold in the pressing step (SP) is further provided,
In the separating step (SE), by supplying a pressure of 45 to 50 tons (ton) to the pressing mold to separate the tube in close contact with the pressing mold,
In the secondary tube fixing step (S60),
In the second fixing mold, a buffer member for fixing one side of the tube fired through the first firing step (S50), but preventing damage to the tube by the pressure transmitted during the second firing step (S80) Is placed more,
The tube cut in the tube cutting step (S10) is a method of manufacturing a coupler for reinforced joints, characterized in that the Rockwell hardness (HRC) is 30 or more. delete delete delete delete

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