KR102141602B1 - Rebar coupler - Google Patents

Abstract

The present invention relates to a mechanical rebar coupler which is able to easily couple neighboring rebars by inserting and coupling a fixing cap, which penetrates to be coupled to the other side of an expansion head of a second bar, into an accommodation space of an accommodation socket with a first bar coupled to one end thereof, to transfer a load against tensile force and compression force in a stable manner by coupling and making the rebars come in full contact with each other, and to freely couple rebars with various diameters. According to the present invention, the mechanical rebar coupler comprises: an accommodation socket which has a first bar coupled to one end and an accommodation space formed on a front side so that an expansion head of a second bar, which is formed on the end part by expanding, is accommodated in the other end to come in full contact with and supported by a lower surface, and also has a male screw thread formed on an outer circumferential surface; a cylindrical fixing cap which has a female screw thread formed on an inner circumferential surface such that the other end of the accommodation socket is coupled to the inside by screws, and a penetrating hole formed in the center to be penetrated by the second bar; and a pressurizer placed between the fixing cap and the expansion head to fix the expansion head in the accommodation socket by pressurizing of the fixing cap, and provided to have adjustable position controlled on the plane in the accommodation space.

Description

Rebar mechanical joint{Rebar coupler}

The present invention can be easily connected to the adjacent rebar by inserting and fixing a fixed cap that is penetrated to the other side of the enlarged head of the second bar inside the receiving space of the receiving socket to which the first bar is coupled at one end. It is a rebar mechanical joint that can stably transmit loads against tensile and compressive forces and can freely connect reinforcing bars of various diameters.

In various construction sites including construction of reinforced concrete structures, reinforcing bars are limited in length due to transport or loading problems. For this reason, the joint of the rebar is essential.

In addition, the precast concrete construction method is a method of assembling a prefabricated PC member in the field, and it is necessary to connect the reinforcing bar of the PC member to join the PC members.

Common rebar joint methods include overlap joints, press joints, and mechanical joints by couplers.

The overlap joint is a method of overlapping the reinforcing bars that are joined using a bond strength with concrete for a certain length.

The overlap joint method is easy to construct but has low work precision, is applicable only to cast-in-place concrete, and has a problem of increased rebar usage due to securing the overlap joint length.

The pressing joint is a joint method in which heat is melted and glued while the reinforcing bars being joined are in contact with each other.

In the press-fitting method, since the positions of the reinforcing bars to be joined must exactly match, high working precision is required. In addition, when the reinforcing bar is pressed, the reinforcing bar may be brittlely deteriorated due to the heat effect, thereby deteriorating performance. In addition, since the welding operation is greatly affected by the field environment such as the weather or operator skill, it is difficult to secure a homogeneous quality and there is a risk of fire accidents due to the use of fire.

The mechanical joint is to mechanically connect the reinforcing bars connected by a coupler, and is joined by screwing as shown in FIG. 1 (Public Patent No. 10-2014-0046308, etc.).

The mechanical joint is difficult to apply when the specifications of the reinforcing bars are different, and it is difficult to fasten when the central axes of the reinforcing bars that are joined do not match due to construction errors.

Particularly, the mechanical joint by the existing coupler excludes the transfer of compressive force between the reinforcing bars, and mainly focuses on the transmission of the tensile force to connect the reinforcing bars. Connected. This often leads to a decrease in structural performance.

On the other hand, in the PC construction method, when the reinforcing bar is joined by a general conventional jointing method, a non-constriction mortar is filled around the reinforcing bar joint for integration between PC members. However, in this case, it was cumbersome to install a separate temporary brace to support the PC member before the charged non-shrink mortar hardened.

In order to solve the above problems, the present invention is to provide a reinforcing bar mechanical joint that is capable of easily absorbing construction errors when reinforcing a reinforcing bar, and the reinforcing bars are in close contact with each other without mutual clearance to stably transmit loads as well as tensile and compressive forces. .

The present invention is to provide a reinforced mechanical joint that can freely connect reinforcing bars of various diameters, and can freely stand without a separate temporary brace when joining PC members.

According to a preferred embodiment of the present invention, the first bar is coupled to one end, and the other end is provided with an enlarged head at the end, and the receiving head is formed in the front so that the enlarged head of the second bar is accommodated and supported in close contact with the bottom surface. The male socket is formed with a receiving socket; And a cylindrical fixing cap having a female thread formed on an inner circumferential surface and a second hole in the center through which the second bar penetrates through the other end of the receiving socket. And a pressurizing hole provided between the fixing cap and the expanding head to fix the expanding head within the receiving socket by pressing the fixing cap to adjust the position in the plane of the receiving space. It provides a reinforced mechanical joint, characterized in that consisting of.

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The present invention according to another preferred embodiment provides a reinforced mechanical joint characterized in that the bottom edge of the enlarged head of the second bar is rounded.

The present invention according to another preferred embodiment provides a reinforcing bar mechanical joint, characterized in that the entrance of the receiving space is formed to enlarge the diameter.

The present invention according to another preferred embodiment provides a reinforcing bar mechanical joint, characterized in that the pressure port is composed of at least two pressure port units divided in plane.

The present invention according to another preferred embodiment provides a reinforced mechanical fitting characterized in that a through-hole is formed in the center of the enlargement head and the second bar is screwed to the through-hole.

According to the present invention has the following effects.

First, the first and second bars can be easily joined by combining the first and second bars on one end and the other end of the receiving socket, and an enlarged head accommodated inside the receiving space of the receiving socket extends through the second bar. It can be stably transmitted to the lower end of the fixed cap that is coupled to the other end. In addition, the enlarged head of the second bar is supported in close contact with the bottom surface of the accommodation space of the receiving socket, so that the compressive force can be smoothly transmitted by direct pressure of the expanding head.

Second, a pressing hole provided between the fixing cap and the expanding head can press and close the expansion head to be closely fixed within the receiving socket. At this time, it is possible to smoothly absorb the eccentric error between the first and second bars while transferring the load well by the pressure inlet.

Third, it is possible to simply use reinforcing bars with various diameters by simply replacing the pressurizing port without replacing the receiving socket or the fixing cap.

Fourth, after completing the first and second joints by the rebar mechanical joint of the present invention, it is possible to firmly fix the second bar by filling the concrete paste between the second bar and the through hole in the center of the fixing cap and inside the receiving space.

1 is a cross-sectional view showing a reinforcing bar joined by a conventional coupler.
Figure 2 is a view showing the coupling relationship of the mechanical reinforcement of the present invention.
Figure 3 is a cross-sectional perspective view showing a coupling state of the mechanical reinforcement shown in Figure 2;
4 is a view showing a coupling relationship of the reinforcing bar mechanical joint of the present invention provided with a pressurizing port.
Figure 5 is a cross-sectional perspective view showing a coupled state of the mechanical reinforcement shown in Figure 4;
Figure 6 is a longitudinal sectional view showing the fastening process of the rebar mechanical joint shown in Figure 4;
Fig. 7 is a cross-sectional view showing embodiments of the pressurizing port.
8 is a view showing a coupling relationship of the reinforcing bar mechanical joint of the present invention provided with a pressure inlet according to another embodiment.
9 is a sectional perspective view showing a coupled state of the rebar mechanical joint shown in FIG. 8;
10 is a sectional perspective view showing an embodiment of a second bar.
11 is a sectional perspective view showing an embodiment of a receiving socket.
12 is a view showing a coupling relationship of a reinforcing bar mechanical joint of the present invention provided with a split-type pressurization port.
Fig. 13 is a cross-sectional view showing an embodiment of a split-type pressurizer.
Fig. 14 is a cross-sectional view showing an eccentric split type pressure mouth.
15 is a perspective view showing a coupling relationship between a second bar and an enlarged head.
16 is a longitudinal sectional view showing a reinforced mechanical joint with a height-adjustable enlarged head.

Hereinafter, the present invention will be described in detail according to the accompanying drawings and preferred embodiments.

FIG. 2 is a view showing a coupling relationship between the rebar mechanical fittings of the present invention, and FIG. 3 is a sectional perspective view showing a coupling state of the rebar mechanical fittings shown in FIG. 2.

As shown in Figure 2, 3, etc., the rebar mechanical joint of the present invention, the first bar (1) is coupled to one end, the other end of the second bar (2) is formed with an enlarged head (21) enlarged formed at the end An accommodation socket 3 in which an accommodation space 31 is formed in front so that the enlarged head 21 is accommodated and supported in close contact with the bottom surface; And a fixing cap 4 having a cylindrical shape in which a through hole 41 is formed so as to be coupled to the other end of the receiving socket 3 so that the second bar 2 penetrates in the center. It is characterized by consisting of.

The present invention is easy to absorb construction errors when reinforcing the reinforcing bar, and the reinforcing bars can be stably transmitted to each other without mutual clearance to transmit loads stably against tensile and compressive forces, and can freely connect reinforcing bars of various diameters as well as PC members. It is intended to provide a self-supporting rebar mechanical joint that can be self-supporting without additional temporary braces when joining.

The rebar mechanical joint of the present invention is configured to include a receiving socket 3 on one side and a fixing cap 4 on the other side.

The present invention is for mutually connecting neighboring reinforcing bars or steel bars, and the first bar 1 and the second bar 2 joined by rebar mechanical joints of the present invention are reinforcing bars or steel bars.

The receiving socket 3 is coupled to one end of the first bar 1 at one end.

To this end, a thread is formed on the outer circumferential surface of the end of the first bar 1, and a coupling groove 32 may be formed at one end of the receiving socket 3 so that the first bar 1 is inserted and screwed.

The distance between the receiving socket 3 and the second bar 2 is adjustable according to the coupling length of the first bar 1 and the coupling groove 32.

At the other end of the receiving socket 3, an enlarged head 21 enlarged and formed at an end of the second bar 2 is inserted to form an accommodation space 31 in which the front is opened to be accommodated.

The fixing cap 4 is coupled to the other end of the receiving socket 3.

The fixing cap 4 is a cylindrical member in which a through hole 41 is formed so that the second bar 2 connected to the first bar 1 in the center penetrates.

In the present invention, since the outer circumferential surface of the second bar 2 is not fixed, but the enlarged head 21 of the second bar 2 is caught and fixed by the fixed cap 4, the through hole of the fixed cap 4 41) The diameter is formed larger than the diameter of the second bar 2 and smaller than the diameter of the enlarged head 21.

Accordingly, the enlarged head 21 of the second bar 2 is caught in the lower portion of the fixing cap 4 to transmit the tensile force.

After completing the joint of the first bar (1) and the second bar (2), fill the concrete paste between the second bar (2) and the through hole (41) and inside the receiving space (31) when pouring concrete The position of the second bar 2 is permanently and firmly fixed.

The receiving socket 3 only needs to expose the entrance of the receiving space 31 to the surface of one side member. That is, the receiving socket 3 can be constructed to be completely embedded in the concrete of one side member.

In this case, there is no part protruding to the outside, which is advantageous for worker passage, the working environment is improved, and safety is improved.

The enlarged head 21 of the second bar 2 may be configured to be in close contact with the bottom surface of the receiving space 31.

Accordingly, the compression force can be transmitted by the direct acupressure of the enlarged head 21 constituting the second bar 2.

In particular, when the present invention is applied to a PC member, eccentricity may occur between the first bar 1 and the second bar 2. However, even if there is an eccentricity between the first bar (1) and the second bar (2) to be connected, the enlarged head (21) is supported in close contact with the bottom surface of the receiving space (31) and over a large area, and the lower part of the receiving space (31). The load is transferred from the receiving socket 3 and the compressive force is stably transmitted to the lower first bar 1.

The reinforcing bar mechanical joint of the present invention can be used for various reinforcing joints such as reinforcing bar joints, joints between PC columns, joints between PC beams and PC columns, and joints between PC walls and PC columns or PC beams in the RC method.

In particular, when applying the present invention, since the first and second bars can be temporarily fixed by mechanical joints before pouring concrete, it is possible to independence of the members without additional temporary braces when joining PC members.

4 is a view showing a coupling relationship between the reinforcing bar mechanical fittings of the present invention provided with a pressurizing port, FIG. 5 is a cross-sectional perspective view showing a coupling state of the reinforcing bar mechanical fittings shown in FIG. 4, and FIG. 6 is shown in FIG. It is a longitudinal sectional view showing the fastening process of the reinforced mechanical joint. And Figure 7 is a cross-sectional view showing embodiments of the pressure port.

4 to 6 and the like, between the fixing cap 4 and the expanding head 21 inside the receiving socket 3, the receiving head 21 is accommodated by the pressing of the fixing cap 4 (3) is fixed to the inside of the receiving space 31 may be provided with a pressurizing port (5) is provided to enable position adjustment in the plane.

Since the first bar (1) is screwed to one end of the receiving socket (3), the position is fixed, and the position and size of the through hole (41) of the fixing cap (4) are also fixed, so it cannot be changed.

Therefore, in order to absorb the eccentric error between the first bar (1) and the second bar (2), the diameter of the through hole (41) of the fixing cap (4) must be formed more generously than the diameter of the second bar (2).

However, in this case, the contact area between the fixed cap 4 and the enlarged head 21 is small, thereby limiting stress transmission.

Conversely, in order to secure the maximum contact area between the fixed cap 4 and the enlarged head 21, the diameter of the through hole 41 of the fixed cap 4 should be formed as close as possible to the diameter of the second bar 2, In this case, it is difficult to absorb the eccentric error of the first bar (1) and the second bar (2).

Therefore, by inserting the pressure port (5) between the fixed cap (4) and the enlarged head (21) so that the load is transmitted by the pressure port (5), the eccentric error between the first and second bars (1, 2) It can be configured to absorb smoothly.

The pressing hole 5 is formed with a through hole 51 through which the second bar 2 penetrates in the center.

Since the pressurizing port 5 can freely adjust a relatively planar position within the receiving space 31, the diameter of the through hole 51 of the pressurizing port 5 may allow the second bar 2 to pass through. It can be formed by minimizing only the degree.

The pressurizing port 5 sufficiently secures the area of acupressure between the pressurizing port 5 and the expanding head 21, the pressurizing port 5 and the fixing cap 4 between the fixing cap 4 and the expanding head 21. Make it possible. Accordingly, the stress acting on the enlarged head 21 of the enlarged head 21 of the second bar 2 → the pressurizing port 5 → the fixing cap 4 → the receiving socket 3 → the first bar 1 Can be delivered smoothly in order.

That is, even if there is an eccentricity between the first bar 1 and the second bar 2 by the pressing hole 5, the stress of the enlarged head 21 is smoothly transferred to the fixing cap 4.

In addition, it is possible to simply apply the second bar 2 of various standards without replacing the receiving socket 3 or the fixing cap 4 only by replacing the pressing port 5.

When the second bar 2 has no eccentricity with the first bar 1, it is possible to use a pressure inlet 5 as shown in FIG. 7(a).

In addition, if the second bar (2) has an eccentricity with the first bar (1), it is possible to use an eccentric pressure mouth (5) as shown in Figure 7 (b).

4 to 6, a female thread is formed on the inner circumferential surface of the receiving socket 3, a male screw is formed on the outer circumferential surface of the fixing cap 4, and the fixing cap 4 is provided with a receiving socket 3 ) Can be configured to be screwed inside.

The fixing cap 4 may be configured to be inserted into the receiving space 31 of the receiving socket 3.

That is, as shown in (a) to (b) of FIG. 6, the end of the first bar 1 at one end is coupled with the second bar 2 inside the receiving space 31 of the receiving socket 3 Can be combined by inserting the fixed cap (4). At this time, between the fixed cap (4) and the enlarged head (21) of the second bar (2) is provided with a pressing port (5).

Then, as shown in Figure 6 (c), the fixing cap (4) is rotated to screw the receiving socket (3).

At this time, the tool coupling portion 42 may be provided on the upper outer circumferential surface or the upper surface of the fixing cap 4 to rotate the fixing cap 4 to engage the receiving socket 3.

The tool coupling portion 42 may be configured by forming an upper outer circumferential surface or an upper surface of the fixing cap 4 in a polygonal shape.

8 is a view showing a coupling relationship of the reinforcing bar mechanical fittings of the present invention provided with a pressurizing hole according to another embodiment, and FIG. 9 is a cross-sectional perspective view showing a coupling state of the reinforcing bar mechanical fittings shown in FIG. 8.

8 and 9, male threads are formed on the outer circumferential surface of the receiving socket 3, female threads are formed on the inner circumferential surface of the fixing cap 4, and the receiving socket 3 is fixed cap 4 ) Can be configured to be screwed inside.

That is, the receiving socket 3 may be inserted into the fixing cap 4.

When the fixing cap (4) is screwed to the outside of the receiving socket (3), it is possible to secure the maximum length of screw coupling. Accordingly, since the pitch of the threads can be formed in a compact manner, the number of revolutions of the fixing cap 4 can be reduced. Accordingly, it is possible to shorten the construction time.

In addition, when the fixing cap 4 is installed outside, the outer diameter of the fixing cap 4 becomes large, so that a fastening can be secured even with a small torque of the rotating tool.

The receiving socket 3 only needs to form the inner diameter of the receiving space 31 only to the extent that it can absorb the construction error of the enlarged head 21 of the second bar 2. Therefore, it is economical to minimize the size of the receiving socket 3.

Meanwhile, the fixing cap 4 and the receiving socket 3 should be combined by rotating the fixing cap 4 to move the fixing cap 4 toward the receiving socket 3 side. Therefore, it is preferable to form the receiving groove (not shown) in which the fixing cap 4 is to be inserted outside the receiving socket 3 of the member on which the receiving socket 3 is embedded.

10 is a sectional perspective view showing an embodiment of the second bar.

10, the bottom edge of the enlarged head 21 of the second bar 2 may be rounded.

When the second bar (2) is somewhat eccentric with the first bar (1), it may be difficult to enter the enlargement head (21) into the entrance of the receiving space (31) of the receiving socket (3).

Accordingly, when the bottom edge of the enlarged head 21 is formed to be rounded, the second bar 2 is of the receiving socket 3 even when the second bar 2 is somewhat eccentric with the first bar 1. It is easy to enter the receiving space (31).

11 is a sectional perspective view showing an embodiment of a receiving socket.

As illustrated in FIG. 11, the entrance of the accommodation space 31 may be formed to have an enlarged diameter.

Even if the second bar (2) and the first bar (1) are eccentric, the receiving space (31) so that the second bar (2) can easily enter the receiving space (31) of the receiving socket (3) The entrance of the can be configured to enlarge the diameter.

When the fixing cap 4 is screwed to the outside of the receiving socket 3, even if the inlet diameter of the inner circumferential surface of the receiving space 31 is enlarged, there is no problem in the coupling between the fixing cap 4 and the receiving socket 3.

12 is a view showing a coupling relationship of the present invention the reinforcing bar mechanical fitting provided with a split type press, 13 is a cross-sectional view showing an embodiment of the split type press, Figure 14 shows an eccentric split type press It is a cross-sectional view.

12 to 14, the pressure port 5 may be configured as a pressure port unit 50 divided into at least two or more planes.

The pressure port 5 may be divided into a plurality of pressure port units 50 to be installed later.

That is, after inserting the enlarged head 21 of the second bar 2 into the receiving space 31 of the receiving socket 3, a plurality of presses are applied to the enlarged head 21 inside the receiving space 31. It can be combined by inserting the old unit (50).

Thereafter, by rotating the fixing cap 4 to screw the receiving socket 3, it is possible to complete the joint of the first bar 1 and the second bar 2.

As shown in (a) of FIG. 13, the pressure port unit 50 may be configured in plural such that the ends are adjacent to each other.

In addition, as shown in Fig. 13 (b), the pressing unit 50 may be configured in plural so that the ends are spaced apart from each other. In this case, the rotation angle of each pressurization unit 50 can be adjusted more freely.

The pressing unit 50 may be selected and used as having a suitable width according to the diameter of the second bar (2).

As shown in FIG. 14, when there is an eccentricity between the first bar 1 and the second bar 2 and the enlarged head 21 is biased within the accommodation space 31, the pressure unit units having different widths By combining the (50) to form the pressure port (5) it can be configured to ensure the maximum pressure area.

15 is a perspective view showing a coupling relationship between a second bar and an enlarged head, and FIG. 16 is a longitudinal sectional view showing a reinforced mechanical fitting provided with a height-adjustable enlarged head.

15 and 16, a through hole 211 is formed in the center of the enlarged head 21 so that the second bar 2 is screwed to the through hole 211. .

A through hole 211 may be formed in the enlarged head 21 so as to adjust the position of the enlarged head 21, and an end of the second bar 2 may be coupled to the through hole 211.

A thread is formed on the outer circumferential surface of the end of the second bar 2, and a female thread is formed on the inner circumferential surface of the through hole 211 to screw them together.

The position of the enlarged head 21 can be finely adjusted by rotating the enlarged head 21.

At this time, as shown in Figure 16, since the end of the second bar 2 may protrude to the lower portion of the enlarged head 21, the enlarged head 21 under the receiving space 31 of the receiving socket 3 It can be formed by the lower surface of the stepped portion 33 for transmitting the stress.

1: 1st bar
2: Second bar
21: magnification head
211: through hole
3: accommodation socket
31: accommodation space
32: joining groove
33: step
4: Fixed cap
41: through hole
42: tool coupling
5: Pressurizing port
50: pressure unit
51: through hole

Claims (8)

At one end, the first bar 1 is coupled, and at the other end, the enlarged head 21 of the second bar 2 formed with the enlarged head 21 formed at the end is accommodated, and the receiving space is provided in front so as to be supported in close contact with the bottom surface. (31) is formed, the outer circumferential surface of the receiving socket 3 is formed male thread; And
A cylindrical fixing cap 4 in which a through hole 41 is formed so that the second bar 2 is penetrated in the center as a female thread is formed on the inner circumferential surface and the other end of the receiving socket 3 is screwed therein; And
It is provided between the fixed cap 4 and the enlarged head 21 to fix the enlarged head 21 in the receiving socket 3 by pressurization of the fixed cap 4 to planarize the interior of the receiving space 31. Pressing port (5) is provided to enable the position adjustment; Rebar mechanical joint, characterized in that consisting of.
delete delete delete In claim 1,
Reinforcement mechanical joint, characterized in that the bottom edge of the enlarged head 21 of the second bar 2 is rounded.
In claim 1,
Reinforcing bar mechanical fittings, characterized in that the inlet of the receiving space 31 is formed to enlarge the diameter.
In claim 1,
Reinforcing bar mechanical fittings, characterized in that the pressing port (5) is composed of a pressing unit (50) divided into at least two on a plane.
In claim 1,
A through-hole 211 is formed at the center of the enlarged head 21, and the second bar 2 is screwed to the through-hole 211, thereby providing a rebar mechanical joint.

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