KR20230030691A - Dedicated mini-jack for seismic rebar coupler with reinforcing member - Google Patents

Abstract

The present invention relates to a dedicated minijack for a seismic rebar coupler provided with a hinged reinforcement member, capable of preventing an operation wedge of a rebar coupler from being bent or broken due to a load concentrated on a lower part of a rack when pressing the operation wedge such that the rebar coupler can hold a rebar, and leading the rebar coupler to be kept stably held without departing through an open upper part of the rack during the pressing action. In accordance with the present invention, the dedicated minijack includes: a device body having a rack provided at a front end part with a holding groove with an open upper part such that a center part of a rebar coupler in which an operation wedge is installed can be held in a crossed state; a hydraulic pump installed in the rear of the rack, and enabling the wedge of the rebar coupler held on the rack to be pressed while hydraulically moving a forward/backward movement rod forward and backward. The dedicated minijack further includes a reinforcement member having one end coupled to the top of the front end part of the rack to be rotatable and having the other end connected to the top of the rear end part of the rack while kept rotated backward around the one end to connect and support the tops of the front and rear end parts of the rack in a state in which the rebar coupler is held in the holding groove of the rack, thereby suppressing a load from being concentrated on the lower part of the rack to prevent the rebar coupler from being bent or broken when being pressed by the forward movement of the forward/backward movement rod.

Description

Dedicated mini-jack for seismic rebar coupler with reinforcing member}

The present invention relates to a mini jack dedicated to an earthquake-resistant reinforcing bar coupler, and in particular, when pressing a wedge for operation of the reinforcing bar coupler so that the reinforcing bar coupler can grip the reinforcing bar, there is no problem of bending or breaking as the load is concentrated on the lower part of the cradle, The present invention relates to a mini-jack dedicated to an earthquake-resistant reinforcing bar coupler having a casement-type reinforcing member to stably maintain a mounted state without leaving the reinforcing bar coupler through an open upper portion of a holder during pressurization.

In general, reinforcing bars are commonly used to reinforce the strength of concrete structures by being buried inside the concrete when constructing reinforced concrete structures in the field of architecture or civil engineering. In particular, in civil structures such as large buildings, special structures, and bridges A large amount of reinforcing bars are placed and used.

Since reinforcing bars are standardized and produced in a certain length, in the case of large buildings, special structures, and civil engineering structures such as bridges, reinforcing bars produced in a limited length must be connected and used. I am using a coupler.

In the case of a reinforcing bar coupler, it has been developed from a method in which a reinforcing bar is inserted into the housing and then the housing is turned with screws to fix it, and in Korean Patent Publication No. 2020-0072063 (2020.06.22.), by simply pressing and pressing a wedge installed in the middle, both sleeves A method has been disclosed in which each inserted reinforcing bar can be grasped by pressing the end of the reinforcing bar.

In the case of the rebar coupler disclosed in Korean Patent Publication No. 2020-0072063 (2020.06.22), it was very difficult for a field worker to press the wedge with his own force using a general tool such as a screwdriver, and the worker applied excessive force There was a problem of getting injured or damaging the coupler.

In order to solve this problem, Korean Patent Publication No. 2020-0036660 (2020.04.07) discloses a 'minijack device for reinforcing bar joint coupler' that allows the wedge of the reinforcing bar coupler to be pressurized by a hydraulic pump. The use of this mini-jack device made it easier to connect the rebars by the rebar coupler because the operator could press the wedge of the rebar coupler with little effort. As a result, there were various effects such as shortening of working time, shortening of construction period/supervision, maintenance management, and reducing problems such as worker injury or damage to the reinforcing bar coupler.

However, in the case of the 'mini-jack device for reinforcing bar joint coupler' disclosed in Korean Patent Publication No. 2020-0036660, when the hydraulic cylinder pin is pushed forward to press the wedge of the reinforcing bar coupler, a moment is applied to the cradle holding the reinforcing bar coupler and it bends easily. After that, the hydraulic cylinder pin could not be accurately focused on the center of the wedge of the rebar coupler, resulting in a high work defect rate. And if more time passed, it would lead to the fatal result of the cradle breaking. This problem was caused by the structural weakness that the load is concentrated on the lower part of the cradle when pressurized because the cradle of the mini jack device is formed in a C-shaped shape with an open top to allow the rebar coupler to be introduced. Therefore, in order to prevent the cradle from bending or breaking, the lower part of the cradle, where the load is concentrated, had to be designed to be excessively thick. However, if the lower part of the cradle is designed to be excessively thick, the weight on the cradle side becomes larger than other parts, and the overall balance is lost. It was virtually impossible to completely control the problem.

Korean Patent Publication No. 2020-0036660 (2020.04.07)

Therefore, the present invention has been proposed to solve the above conventional problems, and an object of the present invention is to concentrate the load on the lower part of the cradle when pressing the operating wedge of the reinforcing bar coupler so that the reinforcing bar coupler can grip the reinforcing bar Provides a mini-jack exclusively for earthquake-resistant reinforcing bar couplers equipped with a hinged reinforcing member so that the reinforcing bar coupler does not escape through the open top of the cradle and maintains the mounted state stably during pressurization. is to do

In order to achieve the above object, the mini-jack for earthquake-resistant rebar coupler according to the technical concept of the present invention is operated when the wedge protruding from the center is pressed, so that two rebars can be gripped and connected. A mini-jack exclusively for earthquake-resistant reinforcing bar couplers capable of pressurizing wedges. A device equipped with a cradle with a mounting groove with an open top at the tip so that the central part of the reinforcing bar coupler with operating wedges can be mounted in a crossed state. main body; a hydraulic pump installed on the rear side of the cradle and capable of pressurizing the wedge of the reinforcing bar coupler mounted on the cradle while advancing and retracting the rod by hydraulic pressure; And a motor installed at the rear of the hydraulic pump to operate the hydraulic pump; one end is rotatably coupled to the upper end of the front end of the cradle, and the other end is rotatably coupled to the rear end of the cradle while rotating backward around one end. When the reinforcing bar coupler is pressurized by the forward movement of the retracting rod by connecting and supporting the upper end of the front end of the cradle and the upper end of the rear end of the cradle in a state in which the reinforcing bar coupler is mounted in the mounting groove of the cradle, the cradle It is characterized in its technical configuration to further include; a reinforcing member that suppresses bending or breaking by concentrating the load on the lower part of the.

Here, the reinforcing member is provided as a bar-shaped member having a through hole for rotation penetrating in the vertical direction at one end and a hooking groove formed at the side end at the other end, and the upper end of the front end of the cradle is provided at one end of the reinforcing member. A rotating pin is installed to allow the reinforcing member to be rotatably coupled in a horizontal direction while penetrating the formed through hole for rotation vertically, and at the upper end of the rear end of the holder, the reinforcing member can be hung in an upward direction corresponding to the locking groove of the reinforcing member. It may be characterized in that a protrusion is installed in a protruding form.

In addition, a through hole penetrating in the forward and backward directions is further formed at the front end of the cradle, and a reinforcing bar coupler is installed in the cradle groove of the cradle while being partially inserted into the through hole of the cradle and supported. It may be characterized in that it further comprises a vertical displacement preventing member contacting and supporting from the front side so as not to be displaced in the vertical direction while being pressed by the forward and backward rod.

In addition, the vertical displacement prevention member is formed in a form extending from the rear end of the fitting portion inserted and supported from the rear side into the through hole formed at the front end of the holder while drawing an arc shape in upward and downward directions, It may be characterized in that it consists of a front contact portion for contacting and supporting the reinforcing bar coupler in a corresponding form from the front side.

In addition, the vertical displacement preventing member may be detachable from the cradle by inserting and detaching a fitting part from the through hole of the cradle.

In addition, an insertion groove is further formed on the lower surface of the installation groove of the cradle, and a reinforcing bar coupler installed in the installation groove of the cradle in a state of being partially inserted into the insertion groove of the cradle and supported is installed in the installation groove of the cradle from the lower side. It may be characterized in that it further comprises a positioning member for contacting and elastically supporting it and positioning it up to a set height.

In addition, the positioning member is installed in a state of being elastically supported on the upper end of the compression spring for elastic support, the lower part of which is inserted into the insertion groove formed on the lower surface of the mounting groove of the holder, and the compression spring, and draws an arc shape forward and backward. It may be characterized in that it consists of a contact zone when it is formed in an extended form while contacting and supporting the reinforcing bar coupler in a corresponding form from the lower side.

In addition, the positioning member is installed in a form surrounding the upper part of the compression spring from the outside, and supports it from the outside so that forward and backward twisting and left and right twisting of the compression spring do not occur while extending and contracting together during the stretching operation of the compression spring. It may be characterized by further comprising a bellows tube.

In addition, a pressing member for contacting and pressurizing the wedge of the rebar coupler is further installed at the front end of the rebar coupler and is detachably installed. It may be characterized in that a conical contact protrusion is formed so that it can be pushed out without.

In addition, it may be characterized in that a pressure control valve for adjusting the hydraulic pressure is installed below the hydraulic pump.

The minijack for earthquake-resistant rebar coupler according to the present invention is equipped with a reinforcing member that connects and supports the open top of the cradle, so that even if the operation of pressing the operating wedge of the rebar coupler is repeatedly performed, the cradle is bent and the rebar is bent. It is possible to solve the problem of high work defect rate due to inability to focus when pressurizing the coupler.

In addition, the present invention can dramatically suppress the fatal problem of breakage while the load is concentrated on the lower part of the holder even when used for a long period of time.

In addition, the present invention can stably maintain the mounted state without leaving the reinforcing bar coupler through the open top of the cradle during pressurization.

In addition, the present invention can position the reinforcing bar coupler in the proper position and maintain the state very stably even during pressurization by the configuration including the vertical displacement preventing member and the positioning member, and the restriction on the lower shape of the cradle disappears. It is possible to design by focusing more on the structural aspect.

In addition, the present invention can precisely control the pressure for pressing the reinforcing bar coupler by a configuration having a pressure control valve.

1 is a side view of a mini-jack for earthquake-resistant rebar couplers according to an embodiment of the present invention;
2 and 3 are side cross-sectional views for explaining the configuration of a minijack dedicated to the earthquake-resistant reinforcing bar coupler according to an embodiment of the present invention.
4a and 4b are partial plan views for explaining the action and operation of a reinforcing member in a minijack dedicated to an earthquake-resistant reinforcing bar coupler according to an embodiment of the present invention.
5A to 5C are a series of reference views for explaining the action and operation of the minijack dedicated to the earthquake-resistant reinforcing bar coupler according to an embodiment of the present invention.

Referring to the accompanying drawings, a minijack dedicated to earthquake-resistant reinforcing bar couplers according to embodiments of the present invention will be described in detail. Since the present invention can have various changes and various forms, specific embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific form disclosed, and should be understood to include all modifications, equivalents, or substitutes included in the spirit and scope of the present invention. Like reference numerals have been used for like elements throughout the description of each figure. In the accompanying drawings, the dimensions of the structures are shown enlarged than actual for clarity of the present invention, or reduced than actual in order to understand the schematic configuration.

Also, terms such as first and second may be used to describe various components, but the components should not be limited by the terms. These terms are only used for the purpose of distinguishing one component from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention. Meanwhile, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in this application, they are not interpreted in an ideal or excessively formal meaning. .

<Example>

1 is a side view of a mini-jack exclusively for an earthquake-resistant rebar coupler according to an embodiment of the present invention, and FIGS. 2 and 3 are side cross-sectional views illustrating the configuration of a mini-jack exclusively for an earthquake-resistant rebar coupler according to an embodiment of the present invention. , Figures 4a and 4b are partial plan views for explaining the action and operation of the reinforcing member in the minijack dedicated to the earthquake-resistant reinforcing bar coupler according to an embodiment of the present invention.

As shown, the mini-jack for earthquake-resistant reinforcing bar coupler according to the embodiment of the present invention operates when the wedge 11 protruding from the center is pressed, so that two reinforcing bars can be gripped and connected. Regarding the reinforcing bar coupler 10 It is provided so that the wedge 11 for operation can be easily pressed by hydraulic pressure.

The minijack for earthquake-resistant reinforcing bar coupler according to an embodiment of the present invention advances and retreats a device main body 100 having a holder 110 on which the reinforcing bar coupler 10 can be mounted at the tip, and a forward and backward rod 220. Hydraulic pump 200 capable of pressurizing the operating wedge 11 of the rebar coupler 10, motor 300 that operates the hydraulic pump 200 by rotational force, forward movement of the advancing rod 220 When the reinforcing bar coupler 10 is pressed by the load concentrated on the lower portion of the cradle 110, it includes a reinforcing member 140 that prevents breakage as a main component.

According to the embodiment of the present invention, when the operating wedge 11 of the reinforcing bar coupler 10 is pressed by the main components as described above, the load is concentrated on the lower part of the holder 110 while minimizing the thickness and weight of the cradle 110 by suppressing damage problems such as bending or breaking, and during pressurization, the reinforcing bar coupler 10 does not escape through the open top of the cradle 110 and is in place It is configured to stably maintain the mounted state in

Hereinafter, a minijack dedicated to the earthquake-resistant rebar coupler according to an embodiment of the present invention will be described in detail, focusing on each of the above components.

The device body 100 has a holder 110 and a reinforcing member 140 at the front end and a handle 150 having a gripping groove 150a at the rear end so that the operator can insert and hold the finger. A hydraulic pump 200 and a motor 300 are installed in the middle of the device body 100 in a built-in form.

Here, the holder 110 formed at the front end of the device body 100 is formed in a C-shape having a mounting groove 110a with an open top. The central portion of the reinforcing bar coupler 10 can be inserted into the mounting groove 110a formed in the holder 110 in a cross shape through the open top and mounted.

A through hole 111 penetrating in the forward and backward directions is further formed at the front end of the holder 110, and the vertical displacement preventing member 120 is partially inserted into the through hole 111 to support the holder 110 in a supported state. It is installed in the mounting groove (110a) of. Looking in more detail, the vertical displacement prevention member 120 includes a fitting part 121 inserted and supported from the rear side into the through hole 111 formed at the front end of the holder 110, and the back of the fitting part 121. It is formed in a form extending from the end while drawing an arc shape in the upward and downward directions, and consists of a front contact portion 122 that contacts and supports the reinforcing bar coupler 10 in a corresponding form from the front side.

As shown in FIG. 5C, the vertical displacement preventing member 120 having such a configuration is configured in the vertical direction while the reinforcing bar coupler 10 mounted in the mounting groove 110a of the holder 110 is pressed by the advancing rod 220. It plays a role of stably supporting by contacting from the front side so that it is not displaced.

Here, the up-and-down displacement prevention member 120 has a structure that can be attached to and detached from the holder 110 by inserting and removing the fitting part 121 to and from the through hole 111 of the holder 110 . Accordingly, when the vertical displacement preventing member 120, which can be said to be the part receiving the most load, is damaged, it can be simply separated from the holder 110 and replaced.

Meanwhile, an insertion groove 112 is further formed on the lower surface of the mounting groove 110a of the holder 110, and the positioning member 130 is partially inserted into the insertion groove 112 of the holder 110 and supported. It is installed in the mounting groove (110a) of the furnace holder (110). Looking more specifically, the positioning member 130 includes a compression spring 131 for elastic support, the lower part of which is inserted into the insertion groove 112 formed on the lower surface of the mounting groove 110a of the holder 110, and the compression spring ( 131) is installed in an elastically supported state and is formed in an extended form while drawing an arc shape forward and backward to contact and support the reinforcing bar coupler 10 in a corresponding form from the lower side. Bottom contact table 132 And, it is installed in a form surrounding the upper part of the compression spring 131 from the outside, so that the compression spring 131 is stretched together during the expansion and contraction operation, and the compression spring 131 is supported from the outside so that the forward and backward twist and the left and right twist do not occur It is made by providing a bellows pipe 133 to do.

As shown in FIGS. 5A to 5C, the positioning member 130 contacts the reinforcing bar coupler 10 mounted in the mounting groove 110a of the holder 110 from the lower side to elastically support it, and is fixed at a height set for pressurization. serves to position it. In this way, when the positioning member 130 is installed in the mounting groove 110a of the holder 110, the rebar coupler 10 is elastically supported so that it accurately rises to a predetermined appropriate height, so that the advancing rod 220 and the contact protrusion 231 move forward. Thus, when pressurizing the wedge 11 of the reinforcing bar coupler 10, it is possible to press by contacting the exact point. In addition, when the position member 130 is installed, there is no need to make the lower thickness of the holder 110 thicker than necessary in order to adjust the proper height of the reinforcing bar coupler 10, and the lower surface of the mounting groove 110a is flat to facilitate mounting. It has the advantage of being able to focus more on structural design because there is no need to make or form a V-shaped groove.

Even in the case of the positioning member 130, it is possible to simply separate it from the holder 110 by separating it from the insertion groove 112.

The reinforcing member 140 closes the open top of the cradle 110 and serves to block the reinforcing bar coupler 10 from being separated through the open top of the cradle 110 during pressurization. However, as a more important point, it serves to stably reinforce the weak structure of the upper-opened cradle 110. In particular, when the forward rod 220 advances and presses the wedge 11 of the reinforcing bar coupler 10, a moment acts on the cradle 110, and the load is concentrated on the lower part of the cradle 110, effectively suppressing the problem of bending or breaking can do.

To this end, the reinforcing member 140 is provided as a flat bar-shaped member having a rotational through hole 141b penetrating in the vertical direction at one end and a locking groove 141a formed at the side end at the other end. And, at the upper end of the distal end of the holder 110, a rotation pin that vertically penetrates the through hole 141b for rotation formed at one end of the reinforcing member 140 and rotatably pin-couples the reinforcing member 140 in the horizontal direction. 142 is installed, and at the upper end of the rear end of the holder 110, a locking protrusion 143 is installed in an upward protruding form so as to walk in correspondence to the locking groove 141a of the reinforcing member 140.

As a result, as shown in FIG. 4A, when the reinforcing member 140 is rotated backward around one end, the locking groove 141a of the other end is attached to the locking protrusion 143 installed at the upper end of the rear end of the holder 110. While being caught, the open top of the cradle 110 is closed, and at the same time, it becomes a closed structure in which the upper end of the front end and the upper end of the rear end of the cradle 110 are structurally disconnected. In this way, when the reinforcing member 140 connects and supports the upper end of the front end and the upper end of the rear end of the cradle 110, the rod 220 and the contact protrusion 231 move forward so that the cradle 110 is mounted on the cradle 110. Even if the wedge 11 of the reinforcing bar coupler 10 is pressed, the load is concentrated on the lower portion of the cradle 110, thereby minimizing the problem that the cradle 110 is easily bent or broken. On the other hand, in this state, when the reinforcing member 140 is rotated forward again, as shown in FIG. 4B, the upper part of the holder 110, which was closed by the reinforcing member 140, is opened, and the reinforcing coupler ( 10) can be freely entered and exited.

What can be noted in the configuration of such a reinforcing member 140 is that the reinforcing member 140 itself is also provided with a simple member about the same as a flat flat bar, and the rotation pin 142 is also provided at the upper end of the front end and the upper end of the rear end of the holder 110, respectively. ) and the locking protrusion 143 are installed, the open top of the cradle 110 can be opened and closed, and structural weaknesses in which the cradle 110 is bent or broken when hydraulic pressure is applied can be effectively reinforced. there is a point

The hydraulic pump 200 is installed on the rear side of the holder 110, and advances and retreats by generating hydraulic pressure by hydraulic oil flowing into and out of the chamber through the driving of the motor 300 installed on the rear side of the hydraulic pump 200. While advancing and retracting the rod 220, it serves to press the wedge 11 of the reinforcing bar coupler 10 mounted in the mounting groove 110a of the holder 110. In this way, the rotational force of the motor 300 and the performance of the hydraulic pump 200 generate maximum hydraulic power to press the wedge 11 of the reinforcing bar coupler 10, so that the operator can attach two reinforcing bars with little effort. It is possible to connect by the rebar coupler (10).

Here, a pressing member 230 for contacting and pressing the wedge 11 of the reinforcing bar coupler 10 is further installed at the front end of the rebar coupler 220, and the front end of the pressing member 230 is formed sharply toward the front A conical contact protrusion 231 is formed. When such a contact protrusion 231 is formed, the wedge 11 of the reinforcing bar coupler 10 can be pushed out without slipping by taking the central portion of the contact surface. For reference, since the contact surface (rear surface) of the wedge 11 of the rebar coupler 10 is formed as a concave surface that becomes deeper toward the center, the conical contact protrusion 231 of the pressing member 230 is the center of the wedge 11 It is capable of contacting and pressurizing effectively.

Here, the pressing member 230 is detachably installed at the front end of the advancing rod 220 . To this end, a concave groove 221 is formed on the front end surface of the advancing rod 220, and a seating protrusion protrudes rearward to be seated in the concave groove of the advancing rod 220 on the rear surface of the pressing member 230. (232) is formed. Furthermore, a female screw and a male screw may be formed in the concave groove of the advancing rod 220 and the seating protrusion 232 of the pressing member 230, respectively, and may be screwed together. In this way, when the pressing member 230 is configured to be detachable from the front end of the forward and backward rod 220, the pressing member 230 is provided with various types having different front and rear lengths, and the size of the reinforcing bar coupler 10 and the degree of pressing In consideration of it, it is possible to select and install a suitable one.

A pressure control valve 240 for adjusting the hydraulic pressure is installed below the hydraulic pump 200 to precisely control the hydraulic pressure. The pressure control valve 240 has a check valve 241 installed in a retracted form in the flow path of the hydraulic pump 200 to perform a check function while adjusting the flow rate of hydraulic oil flowing through the flow path, The spring 243, which provides elasticity so that the check valve 241 tends to move forward, is screwed to the rear end of the check valve 241 and is exposed to the outside of the device body 100 to be rotatable. It consists of an installed control knob 242. As a result, it is possible for the operator to precisely control the pressure of the hydraulic pump 200 for pressurizing the reinforcing bar coupler 10 by simply turning the control knob 242.

The motor 300 is installed on the rear side of the hydraulic pump 200 in a form supported or embedded in the device body 100, and serves to operate the hydraulic pump 200 by rotational force as described above.

Although preferred embodiments of the present invention have been described above, the present invention can use various changes, modifications, and equivalents. It is clear that the present invention can be equally applied by appropriately modifying the above embodiment. Therefore, the above description does not limit the scope of the present invention, which is defined by the limits of the following claims.

100: device body 110: cradle
120: vertical displacement prevention member 130: fixed position member
140: reinforcing member 150: handle
200: hydraulic pump 210: chamber
220: forward and backward rod 230: pressing member
240: pressure control valve 300: drive motor

Claims (10)

In a mini-jack dedicated to an earthquake-resistant reinforcing bar coupler that can press the operating wedge against a reinforcing bar coupler that operates when the wedge protruding from the center is pressed to grip and connect two reinforcing bars,
A device body having a holder having a mounting groove with an open top at the front end so that the central part of the reinforcing bar coupler with operating wedges can be mounted in a crossed state;
a hydraulic pump installed on the rear side of the cradle and capable of pressurizing the wedge of the reinforcing bar coupler mounted on the cradle while advancing and retracting the rod by hydraulic pressure; and
A motor installed at the rear of the hydraulic pump to operate the hydraulic pump; includes,
One end is rotatably coupled to the upper end of the front end of the cradle, and the other end is connected to the upper end of the rear end of the cradle in a state of rearward rotation around the cradle, so that the reinforcing bar coupler is mounted in the cradle groove. A reinforcing member that connects and supports the upper end of the front end of the cradle and the upper end of the rear end of the cradle so that when the reinforcing bar coupler is pressed by the forward movement of the retracting rod, the load is concentrated on the lower part of the cradle and prevents it from being bent or broken. A mini-jack dedicated to earthquake-resistant reinforcing bar couplers, characterized in that. According to claim 1,
The reinforcing member is provided with a bar-shaped member having a through hole for rotation penetrating in the vertical direction at one end and a locking groove formed at the side end at the other end,
At the upper end of the front end of the cradle, a rotation pin is installed that vertically penetrates the through hole for rotation formed at one end of the reinforcing member and rotatably pin-couples the reinforcing member in a horizontal direction, and the upper end of the rear end of the cradle. A minijack for earthquake-resistant reinforcing bar couplers, characterized in that a locking protrusion is installed in an upwardly protruding form so as to walk in correspondence with the locking groove of the reinforcing member. According to claim 1,
The front end of the holder is further formed with a through hole penetrating in the front and rear directions,
In a state of being partially inserted into the through hole of the cradle and supported, the reinforcing bar coupler installed in the cradle groove of the cradle is contacted from the front side so that it is not displaced in the vertical direction while being pressed by the advance rod. A minijack for earthquake-resistant reinforcing bar coupler, characterized in that it further comprises a vertical displacement preventing member for supporting. According to claim 3,
The up-and-down displacement preventing member is formed in a form extending from the rear end of the fitting part inserted and supported from the rear side into the through hole formed at the front end of the holder while drawing an arc shape in upward and downward directions, A minijack dedicated to the earthquake-resistant reinforcing bar coupler, characterized in that it consists of a front contact portion that contacts and supports the coupler in a corresponding form from the front side. According to claim 4,
The minijack for earthquake-resistant reinforcing bar couplers, characterized in that the up-and-down displacement preventing member is detachable from the cradle by inserting and removing the fitting part into the through hole of the cradle. According to claim 4,
An insertion groove is further formed on the lower surface of the mounting groove of the holder,
A positioning member that is installed in the mounting groove of the holder in a state of being partially inserted into the insertion groove of the holder and supported, and contacts and elastically supports the reinforcing bar coupler mounted in the mounting groove of the holder from the lower side to properly position it to a set height A minijack dedicated to the seismic rebar coupler, characterized in that it further comprises. According to claim 6,
The positioning member is a compression spring for elastic support, the lower part of which is inserted into the insertion groove formed on the lower surface of the mounting groove of the holder, and installed in a state of being elastically supported at the upper end of the compression spring, extending forward and backward while drawing an arc shape. A minijack dedicated to the earthquake-resistant reinforcing bar coupler, characterized in that it is formed in the form of a bottom surface contact zone for contacting and supporting the reinforcing bar coupler in a corresponding form from the lower side. According to claim 7,
The positioning member is installed in a form surrounding the upper part of the compression spring from the outside, and expands and contracts together during the expansion and contraction operation of the compression spring, supporting the bellows tube from the outside so that the front and rear twisting and left and right twisting of the compression spring do not occur. A mini-jack dedicated to the earthquake-resistant reinforcing bar coupler, characterized in that it further comprises. According to claim 4,
A pressing member for contacting and pressurizing the wedge of the reinforcing bar coupler is further installed at the front end of the forward and backward rod so as to be detachable. A mini-jack exclusively for earthquake-resistant reinforcing bar couplers, characterized in that a conical contact protrusion is formed so that it can be released. According to claim 4,
A minijack dedicated to the earthquake-resistant rebar coupler, characterized in that a pressure control valve for adjusting the hydraulic pressure is installed below the hydraulic pump.

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