JP2016028824A - Welding device and antirust coated reinforcing bar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a welding device which reduces work hours when an antirust coated reinforcing bar is welded to a welded member, and to provide the antirust coated reinforcing bar.SOLUTION: An antirust coated reinforcing bar is provided with a power supply part L11 in which an internal reinforcing bar is exposed only at one end side. Electric power is supplied to the antirust coated reinforcing bar in a state where the antirust coated reinforcing bar is erected along an axial direction to weld the antirust coated reinforcing bar to a welded member B.SELECTED DRAWING: Figure 18

Description

  The present invention relates to a structure of a welding apparatus and a structure of a rust-proof coated reinforcing bar.

  Many reinforcing bars are used in RC structures (expansion joints for road bridges, wall rails for steel deck slab bridges, building foundation pile head joints, seismic walls, column anchor plates, etc.). On the other hand, welding (stud welding) is performed so as to stand upright. In general, the reinforcing bar to be welded includes a headed stud (JISB1198), a deformed stud, a threaded stud, and the like.

  Further, when these reinforcing bars are used in areas and places where the corrosive environment is severe, a rust-proof coated reinforcing bar in which a rust-proof coating is applied to the surface of the reinforcing bar is used. Japanese Patent Application Laid-Open No. 2006-348670 (Patent Document 1) discloses that a deformed steel bar used for reinforced concrete and the surface of the deformed reinforcing bar are coated with a rust preventive coating.

JP 2006-348670 A

  When welding a rust-coated steel bar with a rust-proof coating on the surface of the reinforcing bar, the strips on both ends of the rust-coated steel bar are usually peeled off to expose the steel bar, and one end of the exposed steel bar is welded The other end is held by the electrode of the welding apparatus, and welding to the member to be welded is performed. After welding, a rust-proof coating is applied again to both ends from which the coating has been removed.

  In particular, in the case of a rust-proof coated reinforcing bar using epoxy resin coating as a rust-proof coating, it is necessary to satisfy the quality standard (JSCE-E102-2003) of the Japan Society of Civil Engineers. Therefore, after welding, it is necessary to manually apply epoxy resin coating to both ends of the reinforcing bar from which the anticorrosive coating has been peeled off, and the number of work steps is enormous. Moreover, even if it is not necessary to satisfy the quality standards, it is an enormous work to manually cover both ends from which the reinforcing bars are stripped.

  The present invention has been made to solve the above-described problems, and a welding apparatus and a rust preventive capable of reducing the number of work steps when welding a reinforcing bar with a rust preventive coating to a member to be welded. It is to provide a coated rebar.

  In the welding apparatus according to the present invention, the rust-proof coated reinforcing bar is provided with a power feeding portion that exposes the internal reinforcing bar only at one end side, and the rust-proof coated reinforcing bar is powered up in the axial direction. A welding apparatus for supplying and welding the rust-proof coated reinforcing steel to a member to be welded, comprising the following configuration.

  A main body portion having an apparatus central axis and supplying electric power to the anticorrosion-coated reinforcing bar; a power supply bar extending from the main body section along the apparatus central axis; and a tip of the power supply bar opposite to the main body section A power supply electrode for supplying power to the anticorrosion-coated reinforcing bar by contacting the power supply part of the anticorrosion-coated reinforcing bar, and parallel to the power supply bar along the central axis of the apparatus from the main body And supporting means for supporting the main body with respect to the member to be welded.

  In the anticorrosion-coated reinforcing bar based on the present invention, the anticorrosion-coated reinforcing bar attached to the welding apparatus and welded to the member to be welded, the columnar reinforcing bar having both end portions and the body portion, and the above-mentioned An anti-rust coating covering the surface of the reinforcing bar, the anti-corrosion coating, the one end of the reinforcing bar, and the reinforcing bar of the body part continuous to the one end is exposed, the other end of the reinforcing bar, and The region where the reinforcing bar is covered and the reinforcing bar is exposed so as to cover the body portion continuous with the other end portion is exposed only to the region where the power feeding electrode contacts and is supported by the supporting portion.

  According to the welding apparatus and the anticorrosive coated reinforcing bar based on this invention, it becomes possible to reduce the work man-hour at the time of welding the anticorrosive coated reinforcing bar to the member to be welded.

It is a front view which shows the external appearance of the rustproof coating | coated reinforcing bar in Embodiment 1. FIG. It is a longitudinal cross-sectional view of the rust-proof covering reinforcing bar in Embodiment 1. FIG. 4 is a first process diagram illustrating a method for coating a rust-proof coating according to Embodiment 1. FIG. 3 is a second process diagram illustrating a method for coating a rust-proof coating in Embodiment 1. FIG. 4 is a third process diagram illustrating a method for coating a rust-proof coating according to Embodiment 1. It is a front view which shows the external appearance of the anticorrosion covering reinforcing bar in Embodiment 2. It is a longitudinal cross-sectional view of the rust-proof covering reinforcing bar in Embodiment 2. It is a front view which shows the external appearance of the anticorrosion covering reinforcing bar in Embodiment 3. It is a longitudinal cross-sectional view of the rust-proof covering reinforcing bar in Embodiment 3. It is a front view which shows the external appearance of the anticorrosion covering reinforcing bar in Embodiment 4. It is a longitudinal cross-sectional view of the rust-proof covering reinforcing bar in Embodiment 4. It is a front view which shows the structure of the welding apparatus in Embodiment 5. FIG. It is a side view which shows the structure of the welding apparatus in Embodiment 5. It is a front view which shows the structure of the welding apparatus which mounted | wore with the anticorrosion covering reinforcing bar in Embodiment 5. FIG. It is a side view which shows the structure of the welding apparatus which mounted | wore with the antirust coating | coated reinforcing bar in Embodiment 5. FIG. It is XVI arrow directional cross-sectional view in FIG. It is a 1st process drawing which shows the welding process of the stud welding of the welding apparatus in Embodiment 5. FIG. It is a 2nd process figure which shows the welding process of the stud welding of the welding apparatus in Embodiment 5. FIG. It is a 3rd process drawing which shows the welding process of the stud welding of the welding apparatus in Embodiment 5. FIG. It is a 4th process figure which shows the welding process of the stud welding of the welding apparatus in Embodiment 5. FIG. It is a front view which shows the structure of the welding apparatus in Embodiment 6. FIG. It is a front view which shows the structure of the welding apparatus which mounted | wore with the anticorrosion covering reinforcing bar in Embodiment 6. FIG. FIG. 10 is a front view showing a configuration of a welding apparatus in a seventh embodiment. FIG. 10 is a side view showing a configuration of a welding apparatus in a seventh embodiment. It is a front view which shows the structure of the welding apparatus which mounted | wore with the anticorrosion covering reinforcing bar in Embodiment 7. FIG. It is a side view which shows the structure of the welding apparatus which mounted | wore with the anticorrosion covering reinforcing bar in Embodiment 7. FIG.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a welding apparatus and a rust-proof coated reinforcing bar according to an embodiment of the present invention will be described with reference to the drawings. In each embodiment described below, when referring to the number, amount, and the like, the scope of the present invention is not necessarily limited to the number, amount, and the like unless otherwise specified. The same parts and corresponding parts are denoted by the same reference numerals, and redundant description may not be repeated. It is planned from the beginning to use a combination of the configurations in each embodiment as appropriate.

[Embodiment 1: Anticorrosion-coated reinforcing steel 10]
Hereinafter, with reference to FIG. 1 and FIG. 2, the rust-proof coated reinforcing bar 10 in the present embodiment will be described. FIG. 1 is a front view showing the appearance of the rust-proof coated reinforcing bar 10, and FIG. 2 is a longitudinal sectional view of the rust-proof coated reinforcing bar 10.

  With reference to FIG. 1 and FIG. 2, this anticorrosion covering reinforcing bar 10 is provided with a region L11 (hereinafter referred to as a power feeding portion L11) where the internal reinforcing bar 11 is exposed only at one end side, and another region L12 (hereinafter referred to as a power supply unit L11). , Referred to as a coating region L12) is covered with a rust preventive coating 12. Specifically, it has a cylindrical reinforcing bar 11 having both end face parts and a body part and extending in the axial direction. In the present embodiment, a deformed reinforcing bar is used as the reinforcing bar 11. The surface of the reinforcing bar 11 is covered with an epoxy resin coating as a rust prevention coating 12.

  For deformed reinforcing bars, for example, the base diameter (nominal diameter: JIS G3112) is 12.9 mm (D13), 15.9 mm (D16), 18.9 mm (D19), 21.9 mm (D22), 24.9 mm (D25). ) Etc. are used. The length is appropriately selected according to the length required at the construction site. The thickness of the epoxy resin coating is a thickness that conforms to “Quality Standards for Epoxy Resin Painted Rebar (JSCE-E102-2003)” of the Japan Society of Civil Engineers. For example, the thickness is 220 μm ± 40 μm.

  The anticorrosion coating 12 exposes the one end surface 11x (downward in the drawing) of the reinforcing bar 11 and the reinforcing bar 11 of the body portion 11z continuous to the one end surface 11x, and continues to the other end surface 11y and the other end surface 11y of the reinforcing bar 11. The reinforcing bar 11 of the body part 11z to be covered is covered. In the region where the reinforcing bar 11 is exposed, only a power feeding part L11 supported by a supporting part 164 (see FIG. 12) is exposed while a power feeding electrode 150 of the welding apparatus 100 described later comes into contact, and the other covering area L12 is a rust-proof coating. 12 is covered. A projecting portion 11 a is provided on one end surface 11 x located at the power feeding portion L 11 of the reinforcing bar 11.

  The length along the axial direction of the power feeding portion L11 where the reinforcing bar 11 is exposed only needs to ensure a length that allows the power supply electrode 150 of the welding apparatus 100 to contact and be held by the support portion 164. Since it is necessary to form a coating film, it is preferably about 60 mm or less. If the power supply electrode 150 and the support portion 164 can be reduced in thickness, the length of the power supply portion L11 may be shortened according to the size.

[Coating method]
Next, with reference to FIG. 3 to FIG. 5, a method of coating the rust-proof coating 12 on the reinforcing bars 11 of the rust-proof coated reinforcing bar 10 of the present embodiment will be described. FIGS. 3 to 5 are first to third process diagrams showing a coating method of the antirust coating 12.

  With reference to FIG. 3, the area | region corresponded to the electric power feeding part L11 which is a location exposed from the antirust coating 12 of the reinforcing bar 11 is previously covered with the masking tape TP1. Next, referring to FIG. 4, the entire surface of the reinforcing bar 11 is coated with an epoxy resin coating as the antirust coating 12. Normally, the entire surface of the reinforcing bar 11 is coated with epoxy resin using a fully automatic coating line.

  Next, referring to FIG. 5, the masking tape TP <b> 1 is peeled off from the reinforcing bar 11. Thereby, the epoxy resin coating of the area | region equivalent to the electric power feeding part L11 is peeled off, and the reinforcing bar 11 is exposed. Further, the epoxy resin coating does not remain in the power feeding portion L11, and even if it is used as the power feeding portion L11, neither power feeding failure nor welding failure occurs.

[Embodiment 2: Rust-proof coated steel bar 20]
Hereinafter, the rust-proof coated reinforcing bar 20 in the present embodiment will be described with reference to FIGS. 6 and 7. FIG. 6 is a front view showing the appearance of the rust-proof coated reinforcing bar 20, and FIG. 7 is a longitudinal sectional view of the rust-proof coated reinforcing bar 20.

  With reference to FIGS. 6 and 7, the basic structure of the anticorrosion-coated reinforcing bar 20 is the same as that of the anticorrosion-coated reinforcing bar 10 of the first embodiment, and the difference is that the reinforcing bar is bent at one place in the middle region. 21 is used.

  A power feeding portion L <b> 21 where the internal reinforcing bar 21 is exposed only at one end side is provided, and the other covering regions L <b> 22 and 23 are covered with the antirust coating 22. Specifically, it has a columnar shape having both end portions and a body portion, and has a substantially linear reinforcing bar 21 having a bent portion at one place. Similar to the first embodiment, the surface of the reinforcing bar 21 is coated with an epoxy resin coating as the antirust coating 22. The bending angle (α °) of the reinforcing bar 21 is an angle appropriately set according to the construction site.

  Since the types of deformed reinforcing bars and the epoxy resin coating are the same as those in the first embodiment, the overlapping description will not be repeated.

  The anticorrosion coating 22 exposes the one end surface 21x (downward in the drawing) of the reinforcing bar 21 and the reinforcing bar 21 of the body portion 21z continuous to the one end surface 21x, and continues to the other end surface 21y and the other end surface 21y of the reinforcing bar 21. The reinforcing bar 21 of the body part 21z to be covered is covered. A projecting portion 21 a is provided on one end surface 21 x located at the power feeding portion L <b> 21 of the reinforcing bar 21.

  The length along the axial direction of the power feeding portion L21 where the reinforcing bar 21 is exposed is preferably about 60 mm or less for the same reason as in the first embodiment.

  The coating method of the anticorrosion coating 22 of the anticorrosion coating reinforcing bar 20 in the present embodiment is the same as the method shown in FIGS.

[Embodiment 3: Anticorrosion coated reinforcing steel 30]
Hereinafter, the rust-proof coated reinforcing bar 30 in the present embodiment will be described with reference to FIGS. 8 and 9. FIG. 8 is a front view showing the appearance of the rust-proof coated reinforcing bar 30, and FIG. 9 is a longitudinal sectional view of the rust-proof coated reinforcing bar 30.

  Referring to FIGS. 8 and 9, the basic configuration of the anticorrosion coated reinforcing bar 30 is the same as the anticorrosion coated reinforcing bar 10 of the first embodiment, and the difference is that the reinforcing bar is bent at two points in the middle region. 31 is used.

  A power feeding portion L31 where the internal reinforcing bar 31 is exposed only at one end side is provided, and the other covering regions L32, 33, and 34 are covered with the antirust coating 32. Specifically, it has a columnar shape having both end portions and a body portion, and has substantially linear reinforcing bars 31 having bent portions at two locations. Similar to the first embodiment, the surface of the reinforcing bar 31 is coated with an epoxy resin coating as the antirust coating 32. In the present embodiment, the covering region L32 and the covering region L34 are bent so as to be substantially parallel.

  Since the types of deformed reinforcing bars and the epoxy resin coating are the same as those in the first embodiment, the overlapping description will not be repeated.

  The anticorrosion coating 32 is exposed to one end surface 31x (downward in the drawing) of the reinforcing bar 31 and the reinforcing bar of the body portion 31z continuous to the one end surface 31x, and continues to the other end surface 31y and the other end surface 31y of the reinforcing bar 31. The reinforcing bar 31 of the body part 31z is covered. A convex portion 31 a is provided on an end surface of the reinforcing bar 31 located at the power feeding portion L <b> 31.

  The length along the axial direction of the power feeding portion L31 where the reinforcing bar 31 is exposed is preferably about 60 mm or less for the same reason as in the first embodiment.

  The coating method of the anticorrosion coating 32 of the anticorrosion coating reinforcing bar 30 in the present embodiment is the same as the method shown in FIGS.

[Embodiment 4: Anticorrosion-coated steel bar 40]
Hereinafter, the rust-proof coated reinforcing bar 40 in the present embodiment will be described with reference to FIGS. 10 and 11. FIG. 10 is a front view showing the appearance of the rust-proof coated reinforcing bar 40, and FIG. 11 is a longitudinal sectional view of the rust-proof coated reinforcing bar 40.

  With reference to FIG. 10 and FIG. 11, this anticorrosion coated reinforcing bar 40 is provided with a power feeding portion L41 where the internal reinforcing bar 41 is exposed only at one end side, and the other covered region L42 is covered with the anticorrosive coating 42. . Specifically, a headed stud is used as the reinforcing bar 41. The surface of the reinforcing bar 41 is subjected to zinc rich coating as a rust-proof coating 42. Zinc rich paint is a paint containing a large amount of zinc (zinc). It contains high-concentration and high-purity zinc powder containing about 80% to 90% of metallic zinc powder (zinc dust) in the coating film. It is a paint. Excellent rust prevention.

  For the headed stud, for example, a shaft diameter (nominal diameter: JISB1198) of 10 mm (10), 13 mm (13), 16 mm (16), 19 mm (19), 22 mm (22), 25 mm (25) or the like is used. It is done. For 10 to 22 (nominal diameter), a standard product is prepared in advance in units of 50 mm to 10 mm, and in 25 (nominal diameter), a standard product is prepared in units of 100 mm to 10 mm.

  The anticorrosion coating 42 is such that one end surface 41x (downward in the drawing) of the reinforcing bar 41, the reinforcing bar of the body portion 41z continuous with the one end surface 41x is exposed 41, the other end surface 41y (head side) of the reinforcing bar 41, and the like. Reinforcing bar 41 of body part 41z which continues to end face 41y is covered. A projecting portion 41 a is provided on one end surface 41 x located at the power feeding portion L 41 of the reinforcing bar 41.

  The length along the axial direction of the power feeding portion L41 where the reinforcing bar 41 is exposed is preferably about 60 mm or less for the same reason as in the first embodiment.

  The coating method of the anticorrosion coating 42 of the anticorrosion coating reinforcing bar 40 in the present embodiment is also the same as the method shown in FIGS.

[Embodiment 5: Welding apparatus 100 (offset type)]
Next, referring to FIG. 12 to FIG. 16, the rust-proof coated reinforcing bar 20 shown in the second embodiment is erected along the axial direction to supply power to the rust-proof coated reinforcing bar 20. A welding apparatus 100 for stud welding the anticorrosion coated reinforcing bar 20 to a welding member will be described. FIG. 12 is a front view showing the configuration of the welding apparatus 100 according to the present embodiment, FIG. 13 is a side view showing the configuration of the welding apparatus 100 according to the present embodiment, and FIG. FIG. 15 is a side view showing the configuration of the welding apparatus 100 equipped with the anticorrosion-coated reinforcing bar 20, and FIG. 16 is a cross-sectional view taken along line XVI in FIG.

  First, with reference to FIG. 12 and FIG. 13, the structure of the welding apparatus 100 in this Embodiment is demonstrated. In this welding apparatus 100, electric power is supplied to the anticorrosion-coated reinforcing bar 20 in the state in which the anticorrosion-coated reinforcing bar 20 in the second embodiment is raised along the axial direction, and the anticorrosion-coated reinforcing bar 20 is attached to the member to be welded. Stud welding.

  This welding apparatus 100 has a main body 110 that has an apparatus central axis CL <b> 1 and supplies electric power to the rust-proof coated reinforcing bar 20. The device center axis CL1 means a vertically moving center axis in the case of moving up and down in a state where the anticorrosion coated reinforcing bar 20 is held at the time of welding by a driving device provided inside. A power cable 170 and a control cable 180 connected to a control unit provided outside are connected to the main body 110.

  The main body 110 is provided with an insulator 120 and a stud chuck 130 along the device central axis CL1, and a power supply bar 140 extending from the main body 110 along the device central axis CL1 is attached to the stud chuck 130. . A feeding electrode 150 that feeds power to the anticorrosion coated reinforcing bar 20 by being in contact with the power feeding portion L21 of the anticorrosive coated reinforcing bar 20 is provided at the tip of the power feeding bar 140 opposite to the main body 110.

  The feed electrode 150 of the present embodiment is provided so as to extend in a direction opposite to the device center axis CL1 when viewed from the feed bar 140, and the axis center CL2 of the feed electrode 150 is parallel to the device center axis CL1. However, the position is shifted (offset) outward from the device center axis CL1.

  The power supply bar 140 is provided with a reinforcing bar positioning jig 190 that extends in a direction opposite to the tip portion and contacts the end of the anticorrosion-coated reinforcing bar 20 opposite to the power supply part L21. The reinforcing bar positioning jig 190 has a contact bar 191 that contacts the end of the rust-proof coated reinforcing bar 20 and a slide bar 192 that can slide along the power feeding bar 140. By sliding the slide bar 192 in the vertical direction according to the length of the anticorrosion coated reinforcing bar 20, the abutting bar 191 is brought into contact with the end of the anticorrosive coated reinforcing bar 20. Hold stably.

  Further, support means 160 is provided which extends in parallel to the power supply bar 140 along the apparatus center axis CL1 from the main body 110 and supports the main body 110 with respect to the member to be welded. The support bar 160 has a support bar extending in parallel to the power supply bar 140 from the main body 110 along the apparatus central axis C1. The support bar includes a leg portion 161 extending from the main body portion 110, an insulating plate 162 provided at the lower end of the leg portion 161, and an extension bar 163 extending downward from the insulating plate 162.

  At the distal end of the extension bar 163 that is a support rod, a support portion 164 that supports the distal end side of the power feeding portion L11 of the anticorrosion coated reinforcing bar 11 held by the power feeding electrode 150 is opposite to the main body portion 110 of the support portion 164. And a spacer portion 165 made of an insulating member provided on the side.

  As shown in FIG. 16 to be described later, the support portion 164 is provided with a holding guide hole 164a that holds the tip of the power feeding portion L21 of the anticorrosion coated reinforcing bar 20. The height of the spacer member 165 provided on the lower surface side (the side opposite to the main body 110) of the support portion 164 is provided at substantially the same height as an annular ferrule used for welding described later. Yes. The position of the spacer member 165 may be provided on the axial center CL2 of the power supply electrode 150. Thereby, since the force received from the main-body part 110 can be received with the spacer member 165, the welding apparatus 100 can be stabilized at the time of the welding of the anticorrosion covering reinforcing bar 20. FIG.

  Next, FIG. 14 and FIG. 15 show a state in which the rust-proof coated reinforcing bar 20 is attached to the welding apparatus 100 having the above configuration. The tip of the power feeding portion L21 provided on one end (lower end) side of the rust-proof coated reinforcing bar 20 is in contact with the steel plate B that is a member to be welded. Specifically, the convex portion 21a provided at the tip of the rust-proof coated reinforcing bar 20 is in contact with the steel plate B (see FIG. 17 described later). Further, the power feeding portion L21 is held by the power feeding electrode 150, and the tip end side of the power feeding portion L21 is held by the support portion 164. Further, between the support portion 164 and the steel plate B, an annular ceramic ferrule 500 is attached to the power feeding portion L21.

  On the other hand, the contact bar 191 of the reinforcing bar positioning jig 190 is in contact with the other end surface (upper end) side of the anticorrosion coated reinforcing bar 20.

  Although the anticorrosion-coated reinforcing bar 20 has a bent portion, in the welding apparatus 100 of the present embodiment, the axial center CL2 of the power supply electrode 150 is offset outward from the apparatus central axis CL1, and therefore, the anticorrosive. The covered reinforcing bar 20 is held, and the rust preventive coated reinforcing bar 20 can be stud-welded. In addition, in order to hold | maintain the anticorrosion covering reinforcing bar 20 more stably, you may fix the anticorrosion covering reinforcing bar 20 with respect to the electric power feeding bar 140 using a clamp jig | tool.

[Stud welding process]
Next, a welding process of stud welding will be described with reference to FIGS. FIGS. 17 to 20 are first to fourth process diagrams showing a welding process of stud welding.

  First, referring to FIG. 17, the power supply portion L <b> 21 of the anticorrosion-coated reinforcing bar 20 is held by the power supply electrode 150 and the front end side of the power supply portion L <b> 21 is held by the support portion 164. The convex part 21a provided at the tip of is in contact with the steel plate B (base material). A ferrule 500 is attached to the power feeding portion L21 located below the support portion 164.

  Next, referring to FIG. 18, the rust-proof coated reinforcing bar 20 is pulled up along the device central axis CL <b> 1 by the pulling device that starts the energized state and is provided in the main body 110. As a result, an arc is generated inside the ferrule 500.

  Next, referring to FIG. 19, after an arc is generated for a certain time, a molten pool is formed in steel plate B (base material). Thereafter, the anticorrosion coated reinforcing bar 20 is quickly lowered along the apparatus central axis CL1, and the tip of the anticorrosive covering reinforcing bar 20 is pressed against the molten pool. Thereafter, the electric current is cut off, whereby the molten metal is gradually cooled inside the ferrule 500, and the collar 21b is formed.

  Next, referring to FIG. 20, after the molten metal is completely cooled, the ferrule 500 is removed to complete the stud welding. Thereafter, repair work by epoxy resin coating is performed on the surfaces of the power feeding portion L21 and the collar 21b from which the reinforcing bars 21 are exposed.

  Thus, in the stud welding by the welding apparatus 100 using the rust preventive coated reinforcing bar 20 in the present embodiment, the stud welding is performed using the power feeding portion L21 provided only on one end side of the rust preventive coated reinforcing bar 20. Can do. As a result, the repair work of the anticorrosion coated reinforcing bar 20 after welding may be performed at one location for each anticorrosion coated reinforcing bar 20, so that conventionally, the repair work at two locations above and below the single anticorrosion coated reinforcing bar has been performed. Compared with the case where it carries out, it becomes possible to reduce the work man-hour at the time of welding the anticorrosion covering reinforcing steel 20 to the steel plate B (base material).

[Embodiment 6: Welding apparatus 100A (offset type)]
Next, referring to FIG. 21 and FIG. 22, power is supplied to the rust-proof coated reinforcing bar 30 in a state where the rust-proof coated reinforcing bar 30 shown in the third embodiment is erected along the axial direction. A welding apparatus 100A for stud welding the anticorrosion coated reinforcing bar 30 to a member to be welded will be described. FIG. 21 is a front view showing the configuration of the welding apparatus 100A in the present embodiment, and FIG. 22 is a front view showing the configuration of the welding apparatus 100A to which the rust-proof coated reinforcing bar 30 is attached.

  Referring to FIG. 21, the basic configuration of welding apparatus 100 </ b> A in the present embodiment is the same as welding apparatus 100 in the fifth embodiment, and the difference is the difference in the shape of reinforcing bar positioning jig 197. Therefore, only the structure of the reinforcing bar positioning jig 197 will be described here.

  The reinforcing bar positioning jig 197 has one end fixed to the lower side of the power supply bar 140 and an inclination bar 195 which is inclined so as to gradually move away from the device center axis CL1 as it goes upward, and the upper part of the inclination bar 195 and the power supply bar 140. And a connecting bar 196 for connecting the two. As the inclination angle of the inclination bar 195, an angle suitable for the inclination angle of the covering region L33 (see FIG. 8) of the anticorrosion covering reinforcing bar 30 is selected.

  In FIG. 22, the case where the anticorrosion covering reinforcing bar 30 is positioned using the reinforcing bar positioning jig 197 will be described. The covering region L33 of the rust-proof covering reinforcing bar 30 is positioned along the lower surface of the inclined bar 195.

  According to this welding apparatus 100A, the same effect as the welding apparatus 100 can be obtained, and even if the rust-proof coated reinforcing bar 30 has a large inclination due to bending, the power feeding portion L31 of the rust-proof coated reinforcing bar 30 can be easily provided. , It can be aligned with the axial center CL2 of the feeding electrode 150. In addition, in order to hold | maintain the anticorrosion covering reinforcing bar 30 more stably, you may fix the anticorrosion covering reinforcing bar 30 with respect to the electric power feeding bar 140 using a clamp jig | tool.

[Embodiment 7: Welding apparatus 200 (center matching type)]
Next, with reference to FIG. 23 and FIG. 24, the structure of the welding apparatus 200 in which the apparatus center axis CL1 and the axis center CL2 of the power feeding electrode 150 coincide will be described. FIG. 23 is a front view showing the configuration of the welding device 200, FIG. 24 is a side view showing the configuration of the welding device 200, and FIG. 25 is a front view showing the configuration of the welding device 200 equipped with the anticorrosion-coated reinforcing bar 10. FIG. 26 is a side view showing the configuration of the welding apparatus 200 to which the rust-proof coated reinforcing steel 10 is attached.

  Referring to FIGS. 23 and 24, the basic configuration of welding apparatus 200 in the present embodiment is the same as welding apparatus 100 in the fifth embodiment, and the difference is the power feeding provided at the lower end of power feeding bar 140. It is in the shape of electrode 150A. The feed electrode 150A in the present embodiment is provided so as to extend in the direction of the device center axis CL1 when viewed from the feed bar 140, and the axis center CL2 of the feed electrode 150 coincides with the device center axis CL1.

  With reference to FIG. 25 and FIG. 26, the state which mounted | wore the welding apparatus 200 which has the said structure with the anti-rust covering reinforcing steel 10 is shown. The tip of the power feeding part L11 provided on one end (lower end) side of the anticorrosion coated reinforcing bar 10 abuts on the steel plate B as a member to be welded, and between the support part 164 and the steel plate B, An annular ceramic ferrule 500 is mounted.

  According to this welding apparatus 200, the same effect as the welding apparatus 100 is obtained, and the axial center CL2 of the feeding electrode 150 and the apparatus central axis CL1 coincide with each other. Occurrence of shaft misalignment due to. In addition, in order to hold | maintain the anticorrosion covering reinforcing bar 10 more stably, you may fix the anticorrosion covering reinforcing bar 10 with respect to the electric power feeding bar 140 using a clamp jig | tool.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  10, 20, 30, 40 Anticorrosion coated reinforcing steel, 11, 21, 31, 41 Reinforcing steel, 11a, 21a, 31a, 41a Convex, 12, 22, 32, 42 Anticorrosive coating, 21b Color, 23, 33, 34 , L12, L22, L32, L33, L34, L42 Covered area, 100, 100A, 200 Welding device, 110 Main body, 120 Insulator, 130 Stud chuck, 140 Feed bar, 150, 150A Feed electrode, 160 Support means, 161 Leg Part, 162 insulating plate, 163 extension bar, 164 support part, 164a holding guide hole, 165 spacer member, 170 power cable, 180 control cable, 190,197 rebar positioning jig, 191 contact bar, 192 slide bar, 195 inclination Bar, 196 connecting bar, B steel plate, CL1 Central axis, CL2 axial center, L11 region, L11, L21, L31, L41 feeding unit, TP1 masking tape.

Claims (6)

In a state where the anticorrosion-coated reinforcing bar provided with a power feeding portion where the internal reinforcing bar is exposed only at one end side is erected along the axial direction, electric power is supplied to the anticorrosion-coated reinforcing bar and the rust-proofing is applied to the welded member. A welding device for welding coated reinforcing bars,
A main body having a device central axis and supplying electric power to the anticorrosion-coated reinforcing bar;
A power feed bar extending from the main body portion along the central axis of the device;
Provided at the tip of the power supply bar opposite to the main body, and a power supply electrode for supplying power to the anticorrosion coated reinforcing bar by contacting the power supply portion of the anticorrosive coated reinforcing bar,
A support means extending parallel to the power supply bar along the device central axis from the main body, and supporting the main body with respect to the member to be welded;
A welding apparatus comprising: The power supply electrode is provided to extend in a direction opposite to the device central axis when viewed from the power supply bar,
The welding apparatus according to claim 1, wherein the holding portion is provided to extend in the same direction as the power feeding electrode. When coating the rust-proof coated reinforcing bar, one end side of the rust-proof coated reinforcing bar is covered with an annular ferrule,
The support means is
A support bar extending in parallel to the power supply bar along the central axis of the apparatus from the main body,
A support portion that is provided at a tip portion of the support bar opposite to the main body portion and supports the tip side of the power feeding portion of the anticorrosion-coated reinforcing bar held by the power feeding electrode;
A spacer member provided on the opposite side of the support portion from the body portion and having the same height as the snap ring,
The welding apparatus according to claim 1 or 2. A rust-proof coated rebar that is mounted on the welding device according to any one of claims 1 to 3 and is welded to a member to be welded.
Columnar reinforcing bars having both end faces and a body part;
A rust preventive coating covering the surface of the reinforcing bar,
The anticorrosion coating is such that the one end surface of the reinforcing bar and the reinforcing bar of the trunk portion continuous to the one end surface are exposed, and the other end surface of the reinforcing bar and the trunk portion continuous to the other end surface are covered. Covering the rebar,
The area where the reinforcing bar is exposed is a rust-proof coated reinforcing bar, where only the area where the power feeding electrode is in contact and supported by the support part is exposed.   The rust-proof coated reinforcing bar according to claim 5, wherein the reinforcing bar has a shape bent in an intermediate region. The reinforcing bar is a deformed reinforcing bar,
The antirust coating is an epoxy resin coating,
The rust-proof covering reinforcing bar according to claim 4 or 5.

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