WO2021182705A1

WO2021182705A1 - Method for manufacturing rebar joint coupler, and rebar joint coupler manufactured by same

Info

Publication number: WO2021182705A1
Application number: PCT/KR2020/014653
Authority: WO
Inventors: 홍종화; 김경식
Original assignee: 홍종화
Priority date: 2020-03-09
Filing date: 2020-10-26
Publication date: 2021-09-16
Also published as: KR102151795B1

Abstract

The present invention relates to a method for manufacturing a rebar joint coupler, and a rebar joint coupler manufactured by same, and, more specifically, to a method for manufacturing a rebar joint coupler, and a rebar joint coupler manufactured by same, which manufacture a rebar joint coupler via firing without machining processing and, thereby, increase economic efficiency by shortening the time spent on manufacturing and reducing the occurrence of failures during a manufacturing process, and improve safety as there is no concern about durability reduction due to machining and durability against fatigue fracture and fatigue stress is improved. To this end, the present invention comprises: a tube cutting step for cutting, according to a design standard, a cylindrical tube with both ends open; a partition plate drawing-in step for drawing into the tube a partition plate for dividing the internal space of the tube; a first tube fixing step for fixing an end of the tube to a first fixing mold; a first part drawing-in step for sequentially drawing into any one space of a pair of internal spaces separated by the partition plate an elastic spring, a piece guide, and a piece; a first firing step for pressing, via a pressing mold, one side into which the elastic spring, the piece guide, and the piece are drawn; a second tube fixing step for fixing the one side of the tube, for which firing is completed, to a second fixing mold; a second part drawing-in step for sequentially drawing into the other space of the pair of internal spaces separated by the partition plate an elastic spring, a piece guide, and a piece; and a second firing step for pressing, via the pressing mold, one side into which the parts are drawn via the second part drawing-in step.

Description

[Amended by Rule 26 03.11.2020]　Method for manufacturing a coupler for rebar joint and a coupler for rebar joint manufactured by the manufacturing method

The present invention relates to a method for manufacturing a coupler for rebar joint and a coupler for rebar joint manufactured by the manufacturing method, and more particularly, to manufacturing a coupler for rebar joint through plastic processing without a machining process. A method for manufacturing a coupler for rebar joint, which improves the economic feasibility by reducing the time required and reducing the occurrence of defects in the manufacturing process, and increasing the stability by improving the durability against fatigue fracture and fatigue stress without fear of deterioration in durability due to machining and manufacturing the above It relates to a coupler for reinforcing bars manufactured by the method.

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

Here, reinforcing bars are cut to a certain length at a rebar manufacturing plant and bundled into one bundle and supplied to the construction site, cut to the required length at the construction site, or fixed to the required number through bundles such as wires. was used.

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

Among the technologies proposed to solve the above problem, there is a coupler for reinforcing bars used when extending reinforcing bars in the longitudinal direction. It includes a fastening piece for tightening the outer circumferential surface of the reinforcing bar.

Among the technologies disclosed as such a coupler for rebar joint, Republic of Korea Registered Utility Model No. 20-0321183 is formed into a semicircle to form a plurality of knurled grooves on the inner periphery and tapered the outer periphery to form a tapered end inner outer periphery of the rebar. A pair of fastening pieces each coupled to, a joint coupler in which a taper hole is formed on one side of the inner side and a female screw is formed on the inner periphery of the other side so that the fastening piece can be inserted inside, and the female screw of the joint coupler can be fastened A male screw is formed on one side of the outer periphery so that a taper hole is formed so that a fastening piece can be inserted therein, and both ends of the reinforcing bar to be joined when combined with the joint coupler are in close contact with the joint coupler.

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 substances enter the inside of the rebar coupler. To prevent penetration, it includes a coupler housing, a locking coupling part, a stopper, an elastic member, and a closing cap part, wherein the elastic member is installed on the left and right sides of the locking coupling part, respectively 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 for coupling the first and second reinforcing bars and the locking coupling part.

On the other hand, there is Republic of Korea Patent No. 10-1765569 (2017.08.01., registered) among the prior art proposed as a method of manufacturing a coupler for rebar joint. Inserting filler metal into the inner circumferential surface of the fastening hole formed in the body of Inserting the compression ring and heating the filler metal to a temperature at which the filler metal is melted by a heating means to join the body and the compression ring.

That is, after inserting a filler metal into the inner circumferential surface of the fastening hole formed inside the body, inserting a plurality of compression rings on the fastening hole, applying heat from the outside to melt the filler metal, fixing the compression ring and the body integrally, and then cooling the body. A fastening hole for the compression ring should be formed, a filler metal should be introduced into the fastening hole formed inside the body, and a plurality of compression rings should be placed in the correct position on the fastening hole into which the filler metal was introduced and heated from the outside while maintaining the arrangement. Since the manufacturing process is complicated because it has to be adhered integrally by adding , the defect occurs when the compression ring is out of position due to vibration or shock during manufacturing, so the probability of occurrence of defects is very high, and economic efficiency is low.

In addition, looking at the manufacturing method of the coupler proposed in the manufacturing method of the rebar joint coupler proposed in Republic of Korea Patent No. 10-2033282 (registered on 10.10. It includes 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, because a process required to process the parts is required.

The present invention has been proposed to solve the above problems, and a manufacturing method for manufacturing a coupler for rebar joint through plastic processing without mechanical processing steps such as cutting, cutting, forging, and manufacturing method manufactured through the manufacturing method It is an object to provide a manufacturing method for manufacturing a coupler for reinforcing reinforcing bars, which has the advantage of high economic efficiency by reducing the time and cost required for processing by providing a coupler for reinforcing bars, and a coupler for reinforcing bars manufactured through the manufacturing method. .

In addition, since there is no processing such as cutting and cutting as described above, it is possible to provide a rebar joint coupler with high durability against fatigue fracture and fatigue stress of the rebar joint coupler, thereby extending the life of the reinforced concrete structure. An object of the present invention is to provide a manufacturing method for manufacturing a joint coupler and a coupler for rebar joint 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 both ends open according to design standards;

a partition plate inlet step of introducing a partition plate partitioning the 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 pulling-in step of sequentially inserting an elastic spring, a pyeon guide, and a pyeonche into any one of a pair of internal spaces partitioned by the partition plate;

a primary firing step of pressing the elastic spring, the pyeonche guide and one side into which the pyeonche is introduced through a pressurizing mold;

a secondary tube fixing step of fixing one side of the tube on which the firing is completed to a second fixing mold;

a secondary part pulling-in step of sequentially inserting an elastic spring, a pyeon guide, and a pyeonche into the other one of the pair of inner spaces partitioned by the partition plate;

It includes; a secondary firing step of pressurizing one side of which the part is introduced through the secondary part drawing-in 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 at a pressure of 190 to 200 tons (ton) for 5 to 7 seconds (sec), and in the pressurizing step A separation step for separating the tube in close contact with the mold from the pressurizing mold is further provided,

The separation step is characterized in that by supplying a pressure of 45 to 50 tons (ton) to the pressurizing mold to separate the tube in close contact with the pressurizing mold.

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

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

And, it is characterized in that by providing a coupler for reinforcing bars manufactured through the above steps to provide a coupler for reinforcing bars that shortens the manufacturing time, lowers the manufacturing cost, and improves durability and stability.

The present invention made as described above has the effect of increasing economic efficiency by lowering the production cost by reducing the manufacturing process and time because there is no mechanical processing operation such as cutting and cutting in the process of manufacturing the rebar joint coupler.

In addition, by manufacturing a rebar joint coupler through plastic processing, it has a long service life due to high resistance to fatigue fracture and fatigue stress, and has the effect of extending the service life of reinforced concrete structures and improving stability.

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 view showing a method for manufacturing a reinforcing bar joint coupler according to the present invention.

3 is an exemplary view showing a coupler for reinforcing bars manufactured through the method for manufacturing a coupler for reinforcing bars according to the present invention.

The manufacturing method (S1) of the coupler for rebar joint according to the present invention, as shown in FIGS. 1 and 2, a tube cutting step (S10), a partition plate retracting step (S20), and a primary tube fixing step (S30) ), the first component drawing step (S40), the first firing step (S50), the second tube fixing step (S60), the second component drawing step (S70), and the second firing step (S80) include

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

Unless defined otherwise, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this 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 art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

Hereinafter, with reference to the accompanying drawings, a method for manufacturing a coupler for rebar joint according to the present invention and a preferred embodiment of the coupler for rebar joint manufactured through the manufacturing method will be described.

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

As shown in the tube cutting step (S10), the partition plate retracting step (S20), the first tube fixing step (S30), the first part drawing step (S40), the first firing step (S50) and , including a secondary tube fixing step (S60), a secondary component insertion 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 reinforcing bar joint coupler, and the cylindrical tube with both ends open is cut according to the design standard.

In the present invention, the tube cuts the cylindrical tube extending in the longitudinal direction according to the design specification, where the design specification specifies the length of the final manufactured rebar joint coupler at the design stage. will be changed

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

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 workpiece material.

In the present invention, the 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, which will be described later, and at the same time, the hardness of reinforcing bars and hardened concrete while placed in a reinforced concrete structure. It should not impair the durability of the reinforced concrete structure by having a hardness that is not relatively low.

At this time, the hardness of the tube is to use a Rockwell hardness of at least 30. If the Rockwell hardness is 30 or less, it is damaged during the firing process or is unsuitable for use in reinforced concrete structures. Although there are advantages, there is a problem in that the price is relatively high and the volume of the firing apparatus increases because the pressure required for firing increases in the first firing step and the second firing step, and thus the price competitiveness is lowered.

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

The partition plate insertion step (S20) is a step of inserting a partition plate partitioning the inner space of the tube into the tube, wherein the partition plate is made in the form of a flat plate and partitions the inner space of the tube into a plurality of independent spaces.

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

In the present invention, the tube and the partition plate are separately molded and then the partition plate is drawn into the tube, but it may be molded in a state integrally formed inside the tube.

The first 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 the first fixing mold is for fixing the tube by inserting one end of 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 either in the form of a box having an insertion hole into which the tube is inserted or in the form of a jig having a plurality of fixing jigs that wrap and fix the outer circumferential surface of the tube. For this purpose, it is preferable to lead to a box shape in which an insertion hole into which a tube is inserted is formed.

The first part pulling-in step (S40) is a step of sequentially inserting the elastic spring, the pyeon guide and the pyeonche into the tube fixed to the first fixing mold.

The elastic spring, the pyeonche guide, and the pyeonche are components constituting the well-known reinforcing bar joint coupler, and a brief description thereof is as follows.

The elastic spring is to elastically support the pyeonche and the pyeonche guide so that the pyeonche and the pyeonche guide are in close contact with the reinforcing bars in the process or in the entered state.

The elastic spring is first introduced into the tube, and one end is brought in contact with the partition plate disposed in the tube.

The pyeon guide is a circular ring and a plurality of protrusion pieces radially arranged on the ring to stably place the position of the pyeonche in the tube before the reinforcing bar enters the tube.

The pyeonche is composed of a plurality of pieces to receive the elastic force of the elastic spring, the reinforcing bar is drawn in, the inner circumferential surface is in contact with the outer circumferential surface of the reinforcing bar, and the outer circumferential surface is in contact with the inner circumferential surface of the tube to fix the reinforcing bar.

Here, the pyeon guide and pyeonche may be separately introduced into the tube, but it is also possible to insert the pyeonche guide and pyeonche into the tube after assembling the pyeonche guide and pyeonche from the outside.

Next, the primary firing step (S50) is a step of pressing one side of the tube into which the component is introduced through a pressurizing mold, wherein the pressurizing mold is a step of pressurizing one side of the tube according to a designed standard.

That is, in the present invention, after inserting the parts into the cylindrical tube, the tube is plastic-processed to process the tube shape. Here, both the primary firing step (S50) and the secondary firing step (S80) to be described later use a swaging processing method for straight-line processing a portion of the outer diameter and outer diameter of the tubular body, and a pressurizing mold for the same.

The swaging method is one of the forging processing methods for compressing or forming a metal material, and it expands or deforms a part or the whole cross section by pressing a bar with a tool while rotating it on an anvil.

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

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

In the pressurization step (SP), the tube is pressurized for 5 to 7 seconds (sec) at a pressure of 190 to 200 tons (ton) of the pressure of the pressurizing mold, where the material is a material having a Rockwell hardness of 30 or more when the pressure is less than 190 tons There is a problem in that the pressure required for the plastic deformation of the tube made is not supplied, and when it exceeds 200 tons, the plastic deformation portion is compressed because the pressure required for the plastic deformation is excessively supplied, and the thickness thereof is reduced or crushed.

In addition, when the time for which the pressure is supplied is limited to 5 to 7 seconds, when less than 5 seconds, the plastic deformation does not proceed smoothly, and when it exceeds 7 seconds, the plastic deformation is excessively made to cause damage to the tube. Because.

Through the first firing step (S50) made as described above, one side of the tube is molded to meet the designed standard.

In general, the coupler for reinforcing bars is formed to have a diameter that is gradually narrowed toward the end opened in the center, which fixes the position of the reinforcing bars while the outer circumferential surface of the pyeonche disposed therein abuts against the inner circumferential surface of the tube and in close contact. To this end, the shape of the tube is also formed so that the diameter of the open end has a relatively small diameter compared to the center, and more preferably, it should be made in a shape corresponding to the outer circumferential surface of the pyeonche disposed therein.

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

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

Since it is formed, it has the advantage of solving problems such as defects caused by thickness deviation and deterioration of durability.

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 is the first firing step (S50) It is made in the form of a box having an insertion hole through which one side of the deformed tube is inserted, thereby stably fixing the tube.

However, the second fixing mold may further include a buffer pad for preventing 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 the insertion hole into which the tube is inserted in the second fixing mold or the contact surface in contact with the tube, which occurs during the secondary firing step This is to prevent the tube and the second fixing mold from colliding with each other by the pressure, thereby preventing the tube from being damaged.

Next, the secondary part pulling-in step (S70) is the same as the first part pulling-in step (S40), as the first part pulling-in step (S40) Since it is the same as , repeated description will be omitted.

The secondary firing step (S80) is a step of plastically processing the tube into which the component is introduced through the secondary component insertion step (S70), and is the same as the first firing step (S50), so the repeated description will be omitted.

The present invention made as described above provides a manufacturing method for manufacturing a coupler for rebar joint, but since mechanical processing operations such as cutting and cutting are not required, the manufacturing process can be shortened, the manufacturing time can be reduced, and the defect rate can be reduced through this It has the advantage of lowering the manufacturing cost.

In addition, by processing the tube through the swaging method in the first firing step and the second firing step, it is possible to provide a tube with no thickness variation, which improves durability and, through this, for rebar joints that can also improve the durability of reinforced concrete structures A coupler (1) may be provided.

As shown in FIG. 3, the coupler 1 for reinforcing bar joints manufactured through the manufacturing method according to the present invention is formed so that the diameter of the opened both ends has a relatively small diameter compared to the center, and this forming method is described above Through the secondary firing step and the secondary firing step, it has a uniform thickness through the swaging method, and it has the advantage of high resistance to fatigue fracture and fatigue stress by dispersing and supporting it even when pressure is applied from the outside.

As described above, the present invention has been described with specific matters such as specific components and limited embodiments and drawings, but these are provided to help a more general understanding of the present invention, and the present invention is not limited to the above embodiments. , various modifications and variations are possible from these descriptions by those of ordinary skill in the art to which the present invention pertains.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and not only the claims to be described later, but also all those with equivalent or equivalent modifications to the claims will be said to belong to the scope of the spirit of the present invention. .

In the present invention made as described above, there is no mechanical processing operation such as cutting and cutting in the process of manufacturing the rebar joint coupler, so the manufacturing process and time can be shortened, thereby increasing economic feasibility by lowering the production cost, and reinforcing bar through plastic processing It has a long service life due to its high resistance to fatigue fracture and fatigue stress by manufacturing a joint coupler, and it has the effect of extending the service life of reinforced concrete structures and improving stability, so it has sufficient industrial applicability.

Claims

A tube cutting step (S10) of cutting a cylindrical tube with both ends open according to design standards;

a partition plate inlet step (S20) of introducing a partition plate partitioning the 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 (S30);

a primary part drawing step (S40) of sequentially inserting an elastic spring, a pyeon guide, and a pyeonche into any one of a pair of internal spaces partitioned by the partition plate;

a first firing step (S50) of pressing the elastic spring, the pyeonche guide and one side into which the pyeonche is introduced through a pressurizing mold;

A secondary tube fixing step (S60) of fixing one side of the fired tube to the second fixing mold;

a secondary part drawing step (S70) of sequentially inserting the elastic spring, the pyeon guide and the pyeonche into the other one of the pair of inner spaces partitioned by the partition plate;

A secondary firing step (S80) of pressurizing one side, into which the part is introduced through the secondary component insertion step (S70), through a pressurizing mold (S80);

In the first firing step (S50) and the second firing step (S80),

A pressurizing step (SP) of pressing the pressurizing mold for 5 to 7 seconds (sec) at a pressure of 190 to 200 tons (ton), respectively;

A separation step (SE) for separating the tube in close contact with the pressurizing mold in the pressurizing step (SP) from the pressurizing mold is further provided,

In the separation step (SE), a pressure of 45 to 50 tons (ton) is supplied to the pressurizing mold to separate the tube in close contact with the pressurizing mold,

In the secondary tube fixing step (S60),

In the second fixing mold, one side of the tube fired through the first firing step (S50) is fixed, but a buffer member for preventing the tube from being damaged by the pressure transmitted during the second firing step (S80) is further placed,

The tube cut in the tube cutting step (S10), a method for manufacturing a coupler for rebar joint, characterized in that the Rockwell hardness (HRC) 30 or more.