JP3000648U - Welding bar fixing device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a reinforcing bar fixing device for welding, which can easily make mutual intervals of reinforcing bars into optimum dimensions. When the first grip 16 of the fixing device 10 grips one rebar 12 and the second grip 20 grips the other rebar 14, one rebar 12 and the other rebar 14 are connected in series. It is fixed approximately concentrically. When the rotation operation member 78 is rotated in this state, the screw member 62 is rotated and the movable member 22 is relatively moved in the axial direction with respect to the cylindrical member 18, so that the one reinforcing bar 12 and the other reinforcing bar 14 are moved. The mutual distance D _T between and can be easily changed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a welding rebar fixing device used for welding in which a gap between a pair of rebars is filled with molten metal by arc welding to join the rebars in series.

[0002]

[Prior art]

 The heating and pressure welding method has been widely known as a means for connecting a pair of reinforcing bars in series in the axial direction by welding, but in recent years, the pair of reinforcing bars are positioned substantially concentrically with a predetermined gap in the axial direction. At the same time, a ceramic backing material having a substantially U-shaped cross section is arranged across the pair of rebars, and molten metal is filled by arc welding into the gap surrounded by the backing material in a substantially half circumference. Is proposed. In this specification, a method of joining a pair of reinforcing bars in the axial direction by arc welding using the ceramic backing material (CB) is called CB welding.

In such CB welding, since it is not necessary to press the reinforcing bars against each other using a hydraulic cylinder or the like unlike the heating and pressure welding method, the welding work can be performed relatively easily at a construction site and the like. Ceramic backing materials release less heat than metal backing and can be welded with a small amount of heat input, and after welding, the backing material can be easily removed by breaking the backing material so that the joint can be visually inspected. There are various advantages.

The above CB welding is applied not only to connect horizontal reinforcing bars at a construction site but also to connect vertical reinforcing bars, so that a predetermined gap is provided in the axial direction. There is a need for a reinforcing bar fixing device for fixing a pair of reinforcing bars in a state. As the reinforcing bar fixing device, for example, a reinforcing bar fixing device that has been used for conventional heating and pressure welding is used. This conventional rebar fixing device includes a main body having a first gripping portion that removably grips one rebar of a pair of rebars, and a main body that removably grips the other rebar of a pair of rebars. (2) A movable member, which is provided with a gripping portion and is movable in a direction parallel to the longitudinal direction of the reinforcing bar with respect to the main body, and a hydraulic cylinder that drives the movable member to press the pair of reinforcing bars against each other And a spring for urging the movable member in a direction opposite to the driving direction of the hydraulic cylinder.

[0005]

[Problems to be solved by the device]

 In the above-mentioned conventional rebar fixing device, it was extremely difficult to maintain the distance between the rebars in order to obtain the optimum mutual spacing for welding, particularly when connecting the rebars in the vertical state. For example, when connecting vertical rebars at a construction site, the gap between the upper end of one of the standing rebars and the lower end of the other rebar hung from a crane should be delicate. It is necessary to allow the gripping part to grip while maintaining a predetermined size by operation. In addition, when a number of rebars that are parallel to each other are stacked in a cylindrical or prismatic cage structure and are welded to connect each rebar vertically, the bottom rebar The gap between the upper end of the bar and the lower end of the upper rebar may be too small or too large.However, in the conventional rebar fixing device, it is necessary to drive the rebar axially against the fixing strength of the above cage. In some cases, it was not possible to obtain the optimum mutual spacing.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a welding rebar fixing device capable of easily adjusting the mutual distance between rebars to an optimum size. is there.

[0007]

[Means for Solving the Problems]

 In order to achieve such an object, the present invention provides a method for joining a pair of reinforcing bars in series by filling molten metal by arc welding between a pair of reinforcing bars axially spaced apart from each other. Is a rebar fixing device for axially positioning the rebars in a substantially concentric manner with a predetermined gap therebetween, and includes (a) a first grip portion that removably grips one of the rebars. And (b) a second holding portion for detachably holding the other reinforcing bar of the pair of reinforcing bars in a state of being in series with the one reinforcing bar, and the main body is provided with a second holding part in the longitudinal direction of the reinforcing bar. A movable member provided so as to be capable of relative movement in parallel directions; and (c) a movable member provided in the main body so as to be immovable in a direction parallel to the longitudinal direction of the reinforcing bar and rotatable about an axis. A screw member screwed together, (d) And a rotary operation member provided in the main body in operatively connected state to the screw member in order to rotate the child member is to contain.

[0008]

[Action]

 With this configuration, when the first gripping portion grips one rebar and the second gripping portion grips the other rebar, one rebar and the other rebar are fixed in series. When the rotation operation member is rotated in this state, the screw member is rotated accordingly and the movable member is moved relative to the main body, so that the mutual distance between one rebar and the other rebar is increased. Easily changed.

[0009]

[Effect of device]

 Therefore, according to the present invention, for example, when welding one rebar erected at a construction site or the like and the other rebar hung from a crane or the like, the one rebar and the other rebar are connected to the first grip portion. After gripping with the second gripping part and the second gripping part respectively, the other rebar is removed from the crane and the above rotary operation member is rotated to optimize the gap between the upper end of one rebar and the lower end of the other rebar. It can be easily adjusted to the dimensions of. In addition, with a number of parallel reinforcing bars arranged in the shape of a cylindrical or prismatic cage, the reinforcing bars forming part of the cage are vertically attached to each reinforcing bar arranged on the lower side. Also in the case of welding in order to connect in the same direction, the lower and upper rebars are gripped by the first gripping part and the second gripping part respectively, and then the rotary operation member is rotated to operate the The gap between the upper end of the side rebar and the lower end of the upper rebar can be approached and separated against the fixing strength of the basket, and the optimum size can be easily adjusted.

Here, the main body is a cylindrical member that fits the movable member and guides it in the axial direction, and the movable member is provided with an internal thread portion formed concentrically with the cylindrical member. The screw member is provided with a male screw portion that is screwed into the female screw portion of the movable member. In such a case, as compared with the case where the screw member is a female screw member such as a nut, the male screw portion on the movable member side does not project axially through the nut-shaped female screw member, so that the reinforcing bar is fixed. This has the advantage of reducing the overall length of the device.

Further, preferably, the rotation operating member is provided rotatably around an axis in a direction perpendicular to a plane including the rotation axis of the screw member and the axis of the reinforcing bar in the main body, Is operatively connected to the screw member via a bevel gear. In this way, since the rotary operation member is located on the operator side, even if the mutual intervals of the multiple rebars arranged in one direction are narrowly arranged, one and the other of the welded It becomes easy to adjust the mutual distance between the reinforcing bars.

[0012] Preferably, the reinforcing bar is provided with a large number of annular protrusions formed on the outer peripheral surface thereof at a constant axial distance, and the reinforcing bars of the first gripping part and the second gripping part are formed. At least one of the first wall and the second wall, which are arranged to face each other to form a groove into which the reinforcing bar is fitted, is screwed to the first wall and faces the second wall. And a reinforcing screw for fixing the reinforcing bar between the pressing screw and the second wall, the pressing screw having a diameter larger than the axial interval of the annular protrusion. It has a pressing surface. By doing so, even if the reinforcing bar is pressed by the set screw, the annular protrusion is only deformed, and no flaw is formed on the outer peripheral surface where the annular protrusion of the reinforcing bar is not formed. Has the advantage that the strength of the building is not impaired.

[0013]

【Example】

 An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a CB welding rebar fixing device (hereinafter, simply referred to as a fixing device) 10 according to an embodiment of the present invention, which is concentric with a pair of rebars 12 and 14 having a predetermined gap D _T. 2 is a side view of the fixing device 10, FIG. 3 is a plan view of the fixing device 10, and FIG. 4 is a view of FIG. FIG. 4 is a sectional view taken along line IV-IV.

The fixing device 10 easily centers the lower rebar 12 and the upper rebar 14 at the same time when the pair of rebars 12, 14 is joined in the vertical direction, and at the same time, the rebars 12, It is suitable for easily adjusting the mutual distance D _T between the shaft ends of 14 to a size suitable for CB welding. The fixing device 10 includes a cylindrical member 18 having a first grip portion 16 that removably grips one rebar 12, and another rebar 14 that removably grips the rebar 14 in a state of being directly aligned with one rebar 12. A cylindrical movable member 22 having two grips 20 and concentric with the axis C of the cylindrical member 18 is provided. The movable member 22 is fitted in the end portion of the cylindrical member 18 so as to be guided in the axial direction while maintaining a concentric relationship with each other, and the second grip provided on the movable member 22. A notch 24 for preventing interference between the base portion of the portion 20 and the cylindrical member 18 is axially formed from one end of the main body 10. As a result, the movable member 22 is non-rotatable about the axis and movable in the axial direction with respect to the cylindrical member 18. The cylindrical member 18 functions as a main body of the fixing device 10 together with a head cover 74 described later.

The first gripping portion 16 and the second gripping portion 20 have the same structure, and are provided so as to project from the cylindrical member 18 and the movable member 22 in a direction perpendicular to the axis C, respectively, and have tips. By dividing the parts into first walls 32 and 34 and second walls 36 and 38 which face each other, concave grooves 28 and 30 for receiving the reinforcing bars 12 and 14 are formed in the first wall 32 and the second wall 36. And between the first wall 34 and the second wall 38, respectively. A push screw 40 in a direction perpendicular to the reinforcing bars 12 and 14 is screwed onto the first walls 32 and 34, respectively, while a V-shaped receiving member for receiving the reinforcing bars 12 and 14 is fixed to the second walls 36 and 38. Surfaces 42 and 44 are formed. Therefore, by pushing the push screw 40 toward the second walls 36 and 38, respectively, the rebars 12 and 14 are pushed against the V-shaped concave receiving surfaces 42 and 44, and are mutually reciprocated. And the axis C of the cylindrical member 18 is parallel to the centered rebars 12 and 14.

Here, the push screw 40 includes a head portion 46 with which a rotary tool (not shown) is engaged, a male screw portion 48, and a tip surface 50 that abuts on the reinforcing bar 12 or 14. Annular protrusions 52 are formed on the outer peripheral surface of the reinforcing bar 12 or 14 at a predetermined constant axial distance L, and the diameter D _S of the tip surface 50 is larger than the axial distance L. Has been formed. As a result, in spite of being pressed by the set screw 40, the outer peripheral surface of the reinforcing bar 12 or 14 which is made relatively soft by annealing or the like does not have a flaw, and the strength of the reinforcing bar 12 or 14 or the reinforcing bar 12 or 14 is used. It is designed to prevent the strength of the constructed building from being impaired.

An annular reinforcing member 56 is welded to the outer peripheral surface of the end of the cylindrical member 18 with a pair of nuts 54 facing each other with the notch 24 in between. A pair of bolts 60 are screwed into the pair of nuts 54, and by adjusting the positions of the tip surfaces of the pair of bolts 60, the second gripping portion 20 of the second grip portion 20 that substantially abuts the tip surfaces of the bolts 60. The position of the base portion around the axis is regulated so that the position of the second grip portion 20 in the circumferential direction coincides with the position of the first grip portion 16.

Further, a screw member 62 is screwed into the female screw formed on the inner peripheral surface of the movable member 22. The first bevel gear 64 is fitted via a key 66 to the small diameter end of the screw member 62 that penetrates the metal bearing 58 screwed into the end of the cylindrical member 18, and the fixing screw 68 is also attached. By fixing the seat plate 70 having a diameter larger than the small-diameter end portion of the screw member 62, the first bevel gear 64 is prevented from coming off, whereby the screw member 62 is immovable in the axial center C direction and is not rotated around the shaft. It is supposed to be rotatable.

A cylindrical head cover 74 fitted to the outside of the shaft end of the cylindrical member 18 and fixed by a fixing screw 72 is rotatably supported by a bearing member 76 fixed to the head cover 74. A supported rotation operation member 78 is provided, and a second bevel gear 80 meshing with the first bevel gear 64 is fixed to the tip of the rotation operation member 78 so as to be relatively non-rotatable. The rotation operating member 78 is rotatably provided about an axis B in a direction perpendicular to a plane including the rotation axis C of the screw member 62 and the axis of the reinforcing bars 12 and 14, and includes a pair of first bevel gears. The screw member 62 is operatively connected to the screw member 62 via the first shaft 64 and the second bevel gear 80.

A mark 82 for positioning the end of the reinforcing bar 12 or 14 is provided at the intermediate portion in the longitudinal direction of the cylindrical member 18. The mark 82 is composed of a shallow groove cut in the circumferential direction.

The ends of the reinforcing bars 12 and 14 fixed at a predetermined distance D _T in the axial direction are welded to each other using a welding jig 88 for fixing the ceramic backing material 86. In this welding jig 88, for example, as shown in FIGS. 5, 6 and 7, a cover 90 is rotatably attached to one side edge of a main body frame 92 having a semi-cylindrical shape via a hinge pin 93. It is a thing. The main body frame 92 includes a bucking holding member 94 at the center in the axial direction and a pair of reinforcing bar receiving members 96 at both ends in the axial direction. Further, the cover 90 rotates between an open position where the rebars 12 and 14 can be inserted on the body frame 92 from the front side and a closed position where the rebars 12 and 14 are sandwiched between the cover 90 and the body frame 92. It is attached to the body frame 92 as much as possible, and is divided into a pair of cover members 98 corresponding to the pair of reinforcing bar receiving members 96 and a cover member 100 at an intermediate portion thereof so that they can be independently opened and closed. It has become.

The backing holding member 94 is a member for positioning and holding the backing material 86 having a substantially U-shaped cross section. In the cover member 100 that covers the backing holding member 94, a catch 102 formed by bending a spring plate is attached to the end opposite to the hinge pin 93, and the catch 102 is driven by its own spring force. By being pressed against the outer peripheral surface of the body frame 92, the cover member 100 is held at the closed position shown in FIG. 6 and can be opened against the spring force thereof. Further, in this cover member 100, an opening 106 is formed in a portion facing the backing holding member 94 in a state of being held at the above-mentioned closed position in order to insert a tip end portion of a welding torch for performing arc welding. Has been done. The cover member 100 functions as a windproof cover.

On the other hand, the pair of reinforcing bar receiving members 96 are adapted to receive the reinforcing bars 12 and 14 on the V-shaped receiving surfaces. The pair of cover members 98 for covering the pair of reinforcing bar receiving members 96 respectively are provided with locking protrusions 108 at the ends opposite to the hinge pins 93, and are rotated by the hinge pins 110 on the main body frame 92. The cover member 98 is held in the closed position shown in FIGS. 5 and 6 by the clipper 112 movably attached being locked to the locking projection 108. The cover member 98 is provided with a tightening bolt 118 which is screwed into a nut 116 fixed to the cover member 98 at a position facing the reinforcing bar receiving member 96 in a state where the cover member 98 is held at the closed position. There is. The tip of the tightening bolt 118 is provided with a pressing metal fitting 120 mounted so as to be relatively rotatable and immovable in the axial direction, and by tightening the tightening bolt 118, a space between the pressing metal fitting 120 and the reinforcing bar receiving member 96 is provided. Then, the reinforcing bars 12 and 14 are clamped. As a result, the body frame 92 and the reinforcing bars 12, 14 are integrally fixed, and the reinforcing bars 12, 14 are further centered by the V-shaped receiving surface of the reinforcing bar receiving member 96.

Below, at a construction site, etc., the upper rebars 14 are fixed to the lower rebars 12 arranged vertically using the rebar fixing device 10 at a predetermined interval D _T, and then they are fixed by CB welding. A procedure for connecting the reinforcing bars 12 and 14 to each other will be described.

First, the upper end of the vertically arranged lower reinforcing bar 12 is fitted into the first grip 16 of the reinforcing bar fixing device 10 with its end face aligned with the mark 82, and the tool is inserted. The first grip 16 is fixed to the upper end of the reinforcing bar 12 by tightening the set screw 40 using the screw. Then, the lower end of the upper reinforcing bar 14 hung by a crane not shown is fitted into the second grip 20 and the set screw 40 is tightened to fix the second grip 20 to the lower end of the reinforcing bar 14. To do. Then, the movable member 22 is moved by rotating the rotating operation member 78 using a tool, and the distance D _T between the reinforcing bar 12 and the reinforcing bar 14 is adjusted to a predetermined dimension.

As described above, the main frame of the welding jig 88 to which the backing material 86 is attached is attached to the ends of the reinforcing bar 12 and the reinforcing bar 14 in which the mutual distance D _T is adjusted to a dimension suitable for CB welding. The welding jig 88 is fixed to the reinforcing bar 12 and the reinforcing bar 14 by accommodating the cover member 98 in the container 92 and closing the cover member 98, hooking the clipper 112 to the locking projection 108, and then tightening the tightening bolt 118 with a tool. Then, a molten metal is filled in the space _DT surrounded by the backing material 86 in a substantially half circumference by arc welding such as carbon dioxide gas arc welding or plasma arc welding. This welding operation can be performed with the cover member 100 open, but the cover member 100 is closed as necessary when the wind is strong, and the front end of the welding torch is passed through the opening 106 formed in the cover member 100. It is also possible to insert by welding, in which case the shield gas will be blown by the wind and the welding condition will be impaired even when the welded part is shielded and welded by shield gas such as carbon dioxide arc welding. Never.

After welding, the welding jig 88 and the fixing device 10 are removed in the reverse operation to the above, and the backing material 86 fixed to the welded portion is destroyed and removed. This completes the series of joining operations.

As described above, according to the fixing device 10 of the present embodiment, when the first grip portion 16 grips one rebar 12 and the second grip portion 20 grips the other rebar 14, one of the The reinforcing bar 12 and the other reinforcing bar 14 are fixed substantially concentrically in a state of being in series. When the rotation operation member 78 is rotated in this state, the screw member 62 is rotated accordingly, and the movable member 22 is relatively moved in the axial direction with respect to the cylindrical member 18. The mutual distance D _T between the 12 and the other reinforcing bar 14 is easily changed.

Therefore, according to the fixing device 10, for example, when welding one reinforcing bar 12 erected at a construction site or the like and the other reinforcing bar 14 hung from a crane or the like, one reinforcing bar 12 or After the other reinforcing bar 14 is gripped by the first gripping section 16 and the second gripping section 20, respectively, the other reinforcing bar 14 is removed from the crane or the like and the rotation operating member 78 is rotatably operated. The gap D _T between the upper end and the lower end of the other reinforcing bar 14 can be easily adjusted to the optimum size. In addition, with a number of parallel reinforcing bars arranged in the shape of a cylinder or prism, the reinforcing bars forming a part of the cage are vertically attached to each reinforcing bar arranged on the lower side. Also in the case of respectively welding to connect to each other, by gripping the lower and upper reinforcing bars with the first grip portion 16 and the second grip portion 20, respectively, by rotating the rotation operating member 78. The upper end of the lower reinforcing bar and the lower end of the upper reinforcing bar can be moved closer to and away from each other against the fixing strength of the basket, and the mutual distance D _T can be easily adjusted to the optimum size.

Further, the main body of the fixing device 10 of this embodiment is composed of the cylindrical member 18 and the head cover 74 fixed to the end thereof, and the movable member 22 is formed concentrically with the cylindrical member 18. The screw member 62 is provided with a male screw portion that is screwed with the female screw portion of the movable member 22. Therefore, as compared with the case where the screw member 62 is formed of a female screw member such as a nut, the male screw portion on the movable member 22 side does not project in the axial direction through the nut-shaped screw member. There is an advantage that the total length of the device 10 is shortened.

Further, according to the fixing device 10 of the present embodiment, the rotation operation member 78 includes the rotation axis C of the screw member 62 and the axis of the reinforcing bars 12 and 14 in the head cover 74 that constitutes the main body. Since the rotary operation member 78 is rotatably provided around the axis perpendicular to the surface and is operatively connected to the screw member 62 via the pair of bevel gears 64 and 80, the rotation operation member 78 should be located on the operator side. Therefore, even if the distance between a plurality of reinforcing bars arranged in one direction is narrowly arranged, it becomes easy to adjust the distance between the one and the other reinforcing bars to be welded.

Further, according to the fixing device 10 of the present embodiment, the first grip portion 16 and the second grip portion 20 are opposed to each other to form the concave grooves 28 and 30 into which the reinforcing bars 12 and 14 are fitted. First wall 32, 34 and second wall 36, 38, which are arranged in the same manner, and a set screw 40 screwed to the first wall 32, 34 and screwed toward the second wall 36, 38. Then, the reinforcing bars 12, 14 are configured to be fixed between the push screw 40 and the second walls 36, 38, and the push screw 40 is different from the axial distance L of the annular protrusion 52 of the reinforcing bars 12, 14. Ri also those having a distal end surface 50 of the large diameter D _S. Therefore, even if the reinforcing screws 12, 14 are pressed by the set screw 40, the annular ridges 52 are only deformed, and the outer peripheral surface of the reinforcing bars 12, 14 where the annular ridges 52 are not formed has a flaw. Since it is not formed, there is an advantage that the strength of the reinforcing bars 12 and 14 does not decrease and the strength of the building is not impaired.

Although one embodiment of the present invention has been described in detail with reference to the drawings, the present invention can be implemented in other modes.

For example, although the cylindrical member 18 and the movable member 22 have a cylindrical shape, they may have a prismatic shape. In short, the cylindrical member 18 only needs to be configured to guide the movable member 22 in the axial direction.

Further, the first grip portion 16 and the second grip portion 20 of the above-described embodiment are arranged so as to face each other so as to form the concave grooves 28 and 30 into which the reinforcing bars 12 and 14 are fitted. , 34 and second walls 36, 38, and a set screw 40 screwed onto the first walls 32, 34 and screwed toward the second walls 36, 38. The walls 32, 34 and the second walls 36, 38 may be configured to come close to each other according to the operation of the screw to pinch the reinforcing bars 12, 14.

The diameter D _S of the tip end surface 50 of the set screws 40 of the first grip portion 16 and the second grip portion 20 is larger than the axial distance L of the annular protrusions 52 of the reinforcing bars 12 and 14. However, the diameter D _S of the push screw 40 on one side may be set to be larger than the interval L, if necessary.

Further, although the screw member 62 is formed in a bolt shape having a male portion to be screwed with a female screw formed on the movable member 22, it is screwed on a male screw protruding from the movable member 22. It may be configured like a nut having a matching internal thread. The nut-shaped screw member needs to be provided in the cylindrical member 18 so as to be immovable in the axial direction and rotatable in the axial direction. The position of the nut-shaped screw member depends on the head cover of the movable member 22. Although it may be on the 74 side, it may be on the first grip portion 16 side.

Further, the rotary operation member 78 has a head having a hexagonal cross section in order to facilitate engagement of the rotary tool, but a handle directly operable by an operator is fixed to the head. You may be touched. Further, the rotation driving electric motor provided on the cylindrical member 18 may be operatively connected to the head thereof.

Although CB welding has been described in the above-mentioned embodiments, other welding methods may be used. In short, the fixing device 10 can be used when the rebars 12 and 14 are positioned concentrically with each other and it is necessary to adjust the mutual distance D _T between the rebars 12 and 14.

Although not illustrated one by one, the present invention can be implemented in various modified and improved modes based on the knowledge of those skilled in the art.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a welding reinforcing bar fixing device according to an embodiment of the present invention.

FIG. 2 is a side view in which a part of the embodiment of FIG. 1 is cut away.

FIG. 3 is a plan view of the embodiment of FIG.

FIG. 4 is a sectional view taken along line IV-IV of the embodiment shown in FIG.

5 is a front view illustrating the welding jig of FIG. 1. FIG.

6 is a sectional view taken along line VI-VI in FIG.

7 is a sectional view taken along line VII-VII in FIG.

[Explanation of symbols]

 10: Reinforcing bar fixing device for welding 12, 14: Reinforcing bar 16: First gripping part 18: Cylindrical member, 74: Head cover (main body) 20: Second gripping part 22: Movable member 28, 30: Recessed groove 32, 34: First wall 36, 38: Second wall 40: Set screw 50: Tip surface 52: Annular protrusion 62: Screw member 78: Rotation operation member

Claims (4)

[Scope of utility model registration request] 1. A pair of reinforcing bars are axially arranged in a predetermined direction in order to join the pair of reinforcing bars in series by filling molten metal by arc welding between a pair of reinforcing bars axially separated from each other by a predetermined gap. A rebar fixing device that positions the rebars substantially concentrically with a gap between them, the main body having a first gripping portion that removably grips one rebar of the pair of rebars; and a rebar of the pair of rebars. A movable member provided with a second gripping portion for detachably gripping the other reinforcing bar in a state of being in series with the one reinforcing bar, and provided on the main body so as to be capable of relative movement in a direction parallel to the longitudinal direction of the reinforcing bar; A screw member provided in the main body so as to be immovable in a direction parallel to the longitudinal direction of the reinforcing bar and rotatable about an axis, and screwed into the movable member; and the screw for rotating the screw member. With the member operatively connected A rotary operation member provided on the serial body, the welding reinforcing bar locking device which comprises. 2. The main body is a cylindrical member that fits the movable member and guides the movable member in the axial direction, and the movable member has a female screw portion formed concentrically with the cylindrical member. The rebar fixing device for welding according to claim 1, wherein the screw member is provided with a male screw portion that is screwed with a female screw portion of the movable member. 3. The rotation operating member is provided rotatably around an axis in a direction perpendicular to a plane including a rotation axis of the screw member and an axis of the reinforcing bar in the main body, and via a pair of bevel gears. The reinforcing bar fixing device for welding according to claim 1, which is operatively connected to the screw member. 4. The reinforcing bar is provided with a large number of annular protrusions formed on the outer peripheral surface thereof at regular intervals in the axial direction, and at least one of the first grip portion and the second grip portion is the A first wall and a second wall arranged to face each other so as to form a groove into which the reinforcing bar is fitted; and a set screw screwed to the first wall and screwed toward the second wall. And a rebar between the push screw and the second wall, the push screw having a tip pressing surface having a diameter larger than the axial distance of the annular protrusion. The reinforcing rod fixing device for welding according to any one of claims 1 to 3.