KR20100036519A

KR20100036519A - Forming method for connecting part of concrete reinforcements

Info

Publication number: KR20100036519A
Application number: KR1020080095779A
Authority: KR
Inventors: 이정우
Original assignee: 주식회사 이웅호성전산
Priority date: 2008-09-30
Filing date: 2008-09-30
Publication date: 2010-04-08

Abstract

PURPOSE: A method for forming a screw on a steel rod is provided to prevent damage to the area with a screw on which tension load is applied and enable a screw to improve the rigidity of a screw processing part. CONSTITUTION: A method for forming a screw on a steel rod comprises following steps. The end of the steel rod is positioned between an upper mold, a lower mold, a left mold, and a right mold. The upper mold, the lower mold, the left mold, and the right mold are operated to compress a rib and a medium side at 50%.

Description

Forming method for connecting part of concrete reinforcements}

The present invention relates to a method for forming a screw in a reinforcing bar, and more specifically, press the end of the reinforcing bar into the upper mold, the lower mold, the left mold and the right mold, and then press the end of the pressed rebar using the rolling screw method. Is formed simply, and the machined part relates to a method of forming a screw in a reinforcing bar so that strength and rigidity can be increased to extend its service life.

Generally, rebars used in reinforced concrete structures or steel reinforced concrete structures are used for reinforcing concrete in building construction and are used as basic materials for social overhead capital construction.

Looking at the structure of the reinforcing bar is formed with a certain thickness and length, in the process of forming as shown in Figure 1, the body of the reinforcing bar 10 is arranged at regular intervals and ribs 30 in the longitudinal direction Is formed.

In order to use the reinforcing bars 10 as described above in the reinforced concrete structure and the steel reinforced concrete structure, the reinforcing bars should be joined to each other. To this end, as shown in FIG. 2, after forming a joint structure (male screw) 40 at the end of the reinforcing bar 10, screwing the reinforcing bar using a coupler 50 having a female thread 51 formed therein. Mechanical joints are widely used.

In the case of a mechanical joint method, a cutting method of cutting a screw at a rebar end by using a lathe or a milling cutter is widely used. In the mechanical joint method, when the tensile load is applied while the reinforcing bars and rebars are connected to each other by a coupler, the threaded portion must not break before other reinforcing bars. do.

However, in the case of forming the screw through such a method, the effective area is reduced during the cutting process. Therefore, the tensile strength of the reinforcing bar is lower than other parts of the reinforcing bar, and the problem occurs that the screw portion is broken first when the tension load action.

Accordingly, an object of the present invention is to devise in view of the above problems, the pressing of the end of the reinforcing bars into the upper mold, the lower mold, the left mold and the right mold, and then press the end of the pressed reinforcement using the rolling screw method It is to provide a method of forming a screw in the reinforcing bar to make it easy to form, the machined portion is increased strength and rigidity to extend the service life.

Means for achieving the above object is the present invention is a pressing preparation step for placing the end of the reinforcing bar between the upper mold, the lower mold, the left mold and the right mold,

Pressing pressing step of pressing the rib and the node side protruding to the outside by pressing the upper end, the lower mold, the left mold and the right mold to press the rebar end,

It comprises a rolling screw processing step for forming a screw on the pressed rib and the node side by rolling.

As described above, according to the present invention, the upper end, the lower mold, the left mold, and the right mold are pressed by pressing the end of the reinforcing bar, and then the end of the pressed rebar is threaded through a rolling screw method.

Therefore, the present invention not only increases strength and rigidity but also breaks even when a tensile load is applied to the threaded portion because the screwed portion is pressed and pressed to form a threaded thread. It will be effective.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a block diagram showing a state before the rebar is pressed according to the present invention, Figure 4 is a block diagram showing a state after the rebar is pressed according to the present invention, Figure 5 is a reinforcing rod reinforcing steel thread processing according to the present invention It is a process chart which shows the method.

3 to 5 as shown in the rebar of the present invention, the ring-shaped nodes 200 are arranged in the body at regular intervals, and ribs 300 are formed in the longitudinal direction, and the reinforcement 100 ends 400 The basic context of threading the coupler and screwing the coupler so that the reinforcing bars and reinforcing bars are connected to each other is the same as in the related art.

However, the present invention is to be able to form a screw more effectively at the end of the reinforcing bar as shown in Figures 3 to 5 to form a screw at the end of the reinforcement 100, pressing the end 400 of the reinforcement 100 by pressing The upper mold 500, the lower mold 510, the left mold 600, the right mold 610 and the pressing device is basically mobilized to the pressed portion pressed, the reinforcement 100 according to the present invention is a pressing preparation step The screw is formed by going through the pressing crimping step and the rolling screw processing step.

Since the upper mold 500, the lower mold 510, the left mold 600, the right mold 610 and the rolling device as described above are widely used technical details, detailed description thereof will be omitted.

This will be described in more detail as follows.

Pressing preparation stage,

After preparing the reinforcing bar 100 in which the ring-shaped nodes 200 are arranged at regular intervals and the ribs 300 are integrally formed in the longitudinal direction, the end 400 of the reinforcing bar 100 is formed in an upper mold. It is positioned between the 500, the lower mold 510, the left mold 600 and the right mold 610.

Pressing crimping step,

When the end 400 of the reinforcement 100 is positioned between the upper mold 500, the lower mold 510, the left mold 600, and the right mold 610, the upper mold 500, the lower mold 510, Pressing the rebar end by operating the left mold 600 and the right mold 610, the rib 300 and the node 200 protruding to the outside is about 50% compressed, the strength and rigidity is increased by that portion .

Roll screw processing step,

When the rib 300 and the node 200 are compressed by about 50% through the pressing step, the end 400 of the compressed rebar 100 is threaded using a rolling device. After the reinforcing thread processing step, the reinforcing bar is to be connected to each other using a known coupler.

1 is a front view of a conventional rebar;

Figure 2 is an exploded perspective view showing a state in which the conventional rebar is connected to the coupler.

Figure 3 is a block diagram showing a state before the rebar is pressed in accordance with the present invention.

Figure 4 is a block diagram showing a state after the rebar is pressed in accordance with the present invention.

Figure 5 is a process chart showing a method of processing the reinforcing rod screw thread according to the present invention.

(Explanation of symbols for the main parts of the drawing)

100; Rebar 200; word

300; Rib 400; End

500; Upper mold 510; Bottom mold

600; Left mold 610; Right mold

Claims

In forming a screw on the end portion 400 of the reinforcing bar 100 in which the nodes 200 are arranged at regular intervals on the body and ribs 300 are formed in the longitudinal direction,

A pressing preparation step of placing an end 400 of the reinforcing bar 100 between an upper mold 500, a lower mold 510, a left mold 600, and a right mold 610;

The upper mold 500, the lower mold 510, the left mold 600, and the right mold 610 are operated to press the end 400 of the reinforcement 100 and the rib 300 and the rib 200 protruding to the outside. Pressing the pressing step of about 50%);

A method of forming a screw in a reinforcing bar, comprising a roll screw processing step of forming a screw through a rolling operation of the rebar end 400 on the side of the pressed rib 300 and the node 200.