JP2015229173A - Welding jig for steel material and welding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a welding method that can easily eliminate unevenness of a steel material joint without leaving an influence such as alteration on a steel material, in welding when adding the steel material such as a steel pipe pile, and perform efficiently the welding of the steel material.SOLUTION: As an application case, for instance, upper and lower steel pipes 11 and 12 are vertically joined and welded through the following steps (a)-(d): (a) a band-like welding jig 1 for a steel material is loosely attached at a position involving a scheduled joining site of the upper steel pipe 11 and the lower steel pipe 12 (a temporary tightening step); (b) a band-like main body 2 of the welding jig 1 for a steel material is firmly tightened while abutting end parts of the upper and lower steel pipes 11 and 12 to each other (a main tightening step), which can eliminate unevenness of the upper and lower steel pipes; (c) a joint of the upper and lower steel pipes 11 and 12 is temporary welded through an opening 7 of the band-like main body 2 of the welding jig 1 for a steel material (a temporary welding step); and (d) the joint of the upper and lower steel pipes 11 and 12 is normally welded in a state where the welding jig 1 for a steel material is detached (a normal welding step).

Description

  The present invention relates to a welding jig (positioning device) used for welding when joining various steel materials such as a steel pipe pile, a steel pipe sheet pile, a casing pipe, an H-shaped steel, and a round steel, and a method for welding a steel material using the jig. It is about.

  For steel construction such as steel pipe piles, steel pipe sheet piles, and casing pipes, construction work, installation work, and burial work, etc. Yes.

  For example, in the case of longitudinal welding of a steel pipe pile, the butted portion (seam) is circumferentially welded in a state where the upper pile and the lower pile are butted. At that time, in order to eliminate the mistake (displacement of the end face of the upper pile and the lower pile) in the past, a guide plate called an erection piece etc. was previously placed on the outer peripheral surface of the end of the steel pipe pile (mainly the lower pile). Welding at intervals, but by aligning the upper and lower piles with the welding-type guide, butting the end faces of both, in that state, the butted parts of the upper and lower piles are circumferentially welded .

  However, as described above, when guide plates such as erection pieces are welded to steel pipe piles (mainly lower piles), the weld marks on the plates remain, and the effect of heat during welding and gas cutting causes steel pipes to be affected. There has been a problem that the quality of the steel pipe pile has changed at the joint.

  In addition, welding and gas cutting of guide plates such as erection pieces take time and effort, and therefore, new means that can save labor and shorten time for longitudinal welding have been desired.

  In addition, in the conventional circumferential welding method, since the circumferential welding is performed with the end faces of the upper pile and the lower pile directly contacting each other, an appropriate route interval (route gap) is ensured during welding. The problem of being unable to do so occurred.

  In view of the above-mentioned problems of the prior art, the object of the present invention is to affect the steel material such as alteration in welding when adding various steel materials such as steel pipe piles, steel pipe sheet piles, casing pipes, H-section steel, and round steel. To provide a welding jig (positioning device) and a welding method using the same that can easily eliminate the mistake of the steel joint without leaving, and can efficiently proceed the welding of the steel. is there.

The above purpose is
A substantially band-shaped main body that is attached so as to entrain a joining portion (part to be joined) of the first steel material and the second steel material;
Tightening means for tightening the band-shaped body;
An opening for welding formed in the band-shaped body so as to face the joint,
It is achieved by a steel welding jig having the following.

  It is preferable that a protrusion for securing a route interval is provided on the inner peripheral surface side of the band-shaped main body.

The above purpose is
Attaching a steel welding jig at a position where the joining portion (part to be joined) of the first steel material and the second steel material is wound;
Tightening the band-shaped body of the welding jig;
Through the opening of the band-shaped main body of the welding jig, the step of temporarily welding the joint,
A step of performing the main welding of the joint portion with the steel material welding jig removed;
It is achieved by a steel material welding method characterized by comprising:

The above purpose is
Attaching a steel welding jig to a position where the joint between the first steel and the second steel is wound;
Tightening the band-shaped body of the welding jig;
Temporarily welding the joint through the opening of the band-shaped body;
Using the welding jig as a direct or indirect positioning means, attaching a guide rail for a welding apparatus to a predetermined position of a steel material; and
Using the welding device movably provided along the guide rail, and performing a main welding of the joint portion;
It is achieved by a method for welding steel including.

The above purpose is
Attaching a steel welding jig at a position where the joining portion (part to be joined) of the first steel material and the second steel material is wound;
Tightening the band-shaped body of the welding jig;
Temporarily welding the joint through the opening of the band-shaped body;
Using the welding jig, attaching the positioning member to a predetermined position of the steel material,
Using the positioning member, attaching a guide rail for a welding apparatus to a predetermined position of the steel material,
Using the welding device movably provided along the guide rail, and performing a main welding of the joint portion;
It is achieved by a method for welding steel including.

The welding jig of the present invention includes a substantially band-shaped main body that is attached so as to entrain a joint portion (part to be joined) of the first steel material and the second steel material, and tightening means for tightening the band-shaped main body. And an opening for welding formed in the band-shaped main body so as to face the joining portion.
If such a welding jig is used for welding to add a steel material, there is no need to weld a guide plate such as an erection piece to the outer peripheral surface of the end of the steel material. There is no deterioration of the steel material (due to heat during welding).
In addition, the welding jig of the present invention does not require welding to a steel material when used, and therefore can be easily attached and detached. Therefore, the work for welding the steel materials can be saved, and the time for the work can be shortened.
Further, the welding jig of the present invention is formed with a welding opening (window) so as to face the joining portion (part to be joined) of the steel material to be added. In the range of this opening, the joint part (namely, the outer edge of the opposing part of a steel material end surface) of steel materials is exposed. Therefore, even if the band-shaped main body is wound around the steel joint, the outer periphery of the joint can be tack-welded.

  Further, in the welding jig of the present invention, a protruding portion that is fitted to the welding groove portion and secures a route interval is provided on the inner peripheral surface side of the band-shaped main body. This protrusion bites into the joint and secures a gap of a predetermined design size between the end faces of the steel materials facing each other. Accordingly, an appropriate route interval (route gap) can be secured during welding, so that the welding quality of the steel material can be improved as compared with the conventional case.

In the welding method of the present invention, the steel materials to be added are circumferentially welded through the following steps (a) to (d).
(A) A step of temporarily (loosically) attaching a substantially band-shaped steel material welding jig to a position where the joining portion of the first steel material and the second steel material is wound (temporary tightening step).
(B) A step of tightening the band-shaped main body of the steel material welding jig in a state where the ends of the first and second steel materials are butted together (main tightening step).
(C) A step of temporarily welding the joint portion of the first and second steel materials through the opening of the band-shaped main body of the steel material welding jig (temporary welding step).
(D) A step (main welding step) of performing main welding of the joint portions of the first and second steel materials with the steel material welding jig removed.

The band-shaped main body used in the above method is attached so as to straddle the joint portion (seam) of the first and second steel materials and so as to surround and surround the joint portion. In this state, the band-shaped main body is tightened in the direction of “tightening the steel joint” to forcibly align the end faces of the first and second steel materials. Differences (seam misalignment) can be eliminated. In addition, the first and second steel materials can be securely fixed at the concentric positions where the misunderstanding is eliminated.
Moreover, since it is not necessary to weld guide plates such as erection pieces in order to eliminate such misunderstandings and alignment, it is possible to save the labor of welding, which has been necessary in the past, and to steel materials (caused by heat during welding). ) There will be no alteration. Moreover, welding can be completed in a shorter time than before.
In addition, since the first and second steel materials are securely fixed by the band-shaped main body, and the joint portion is temporarily welded in that state, the first and second steel materials should be visually observed during the temporary welding and the subsequent main welding. There is no difference.

Moreover, in this invention, a guide rail is attached to one outer peripheral surface of the 1st and 2nd steel materials, and a steel material junction part is main-welded with the welding apparatus which moves along this guide rail. The guide rail used in this method is adapted to attach the guide rail to the steel material using a welding jig as a direct or indirect positioning means. In this case, “using a welding jig as a“ direct ”positioning means” means, for example, adjacent to the welding jig (that is, the welding jig becomes a direct positioning member). ) Refers to attaching a guide rail in place. In addition, “when using a welding jig as an“ indirect ”positioning means” means that some other member such as a spacer or a positioning member is interposed between the guide rail and the welding jig ( This separate member serves as a direct positioning member) and means that the guide rail is attached at a predetermined position.
And by using such a guide rail for welding apparatuses, the operation | work of this welding can be automated, and shortening of construction time and labor saving can be aimed at.
Further, by attaching the guide rail for the welding apparatus in the above-described procedure, the guide rail and the welding apparatus can be easily and accurately positioned at predetermined positions. Here, the “predetermined position” is a design position, for example, a position where the tip of the welding rod or the like reliably makes point contact with the joint (circumferential weld).

It is the top view and side view of the jig for steel material welding which concern on this invention. It is a top view which shows a mode that the jig | tool for steel material welding shown to Fig.1 (a) was decomposed | disassembled. It is a figure which shows the welding procedure of steel materials (steel pipes). It is a continuation of Drawing 3A, and is a figure showing the welding procedure of steel materials (steel pipes). It is a continuation of Drawing 3B, and is a figure showing the welding procedure of steel materials (steel pipes). It is a continuation of Drawing 3C, and is a figure showing the welding procedure of steel materials (steel pipes). It is a continuation of Drawing 3D, and is a figure showing the welding procedure of steel materials (steel pipes). It is a continuation of Drawing 3E, and is a figure showing the welding procedure of steel materials (steel pipes). It is sectional drawing which shows a mode that the upper steel pipes are inserted in the band-shaped main body. It is sectional drawing which shows a mode that the upper and lower steel pipes were fixed with the jig | tool for steel material welding. It is sectional drawing which shows a mode that the junction part of an upper and lower steel pipe is tack-welded through the opening part of the jig for steel materials welding. It is a figure which shows other embodiment of the welding procedure of steel materials (steel pipes). It is a continuation of Drawing 3A, and is a figure showing the welding procedure of steel materials (steel pipes). It is a continuation of Drawing 3B, and is a figure showing the welding procedure of steel materials (steel pipes). It is a continuation of Drawing 3C, and is a figure showing the welding procedure of steel materials (steel pipes). It is a continuation of Drawing 3D, and is a figure showing the welding procedure of steel materials (steel pipes). It is a continuation of Drawing 3E, and is a figure showing the welding procedure of steel materials (steel pipes). It is a continuation of Drawing 3F, and is a figure showing the welding procedure of steel materials (steel pipes). It is a continuation of Drawing 3G, and is a figure showing the welding procedure of steel materials (steel pipes). It is a continuation of Drawing 3H, and is a figure showing the welding procedure of steel materials (steel pipes). It is a figure which shows other embodiment of the attachment method of a guide rail.

(Configuration of steel welding jig)
First, the structure of the steel material welding jig 1 will be described with reference to FIGS. 1 and 2.
Hereinafter, embodiments of the present invention will be described by taking steel pipes or steel pipe piles as representative examples of steel materials.

As shown in FIG. 1, the steel welding jig 1 is mainly composed of
A substantially band-shaped main body 2 attached so as to wind a joint portion of two steel pipes to be longitudinally connected (that is, at a position where the joint of two steel materials can be surrounded);
A bolt 4 and a nut 5 that serve as tightening means for tightening the band-shaped main body 2;
And a window 7 for tack welding formed at a position facing a joint portion (temporary welding planned site) of the steel pipes.

  As shown in FIG. 2, the band-shaped main body 2 is configured to be divided into a plurality of bodies. In this embodiment, the structure which can be divided into 2 as an example is employ | adopted. The half-cracked members 21 and 31 constituting the band-shaped body 2 are integrally provided with brackets (flanges) 24 and 34 into which the bolts 4 can be inserted, and hinge plates 26 and 36 constituting a part of the hinge. . As shown in FIG. 1, the hinge plates 26 and 36 connected by the eyebolt 6 constitute a hinge 8 as a whole.

  The band-shaped main body 2 having the above-described configuration is attached to a position surrounding a joint portion (scheduled welding portion) of upper and lower steel pipes to be cascaded. At the time of tack welding described later (see FIG. 3E), the inner peripheral surface of the band-shaped main body 2 is in close contact with the upper outer peripheral surface of the lower steel pipe and at the same time with the lower outer peripheral surface of the upper steel pipe. To do.

  The bolt 4 and the nut 5 constituting the tightening means have a role of tightening the band-shaped main body 2 in the “joining portion tightening direction”. By tightening the bolt 4 screwed into the nut 5, the inside of the band-shaped main body 2 gradually narrows, so that the outer peripheral surfaces of the upper and lower steel pipes are aligned with each other according to the movement, and the misalignment gradually occurs. Is finally eliminated, and the difference between the ends of the upper and lower steel pipes is eliminated. In the present embodiment, bolts and nuts are employed as an example of tightening means, but other means may be employed as long as the band-shaped main body 2 can be tightened.

  On the inner peripheral surface side of the band-shaped main body 2, there is provided a protruding portion 9 that fits into a weld groove portion at a joint location of upper and lower steel pipes. The protrusion 9 has a tapered surface 91 (see FIG. 4). As will be described later, at the time of tack welding, the tapered surface 91 is placed on the groove surface at the lower end of the upper steel pipe. It has become. As described later, the protruding portion 9 having such a configuration plays a role of securing a route interval by fitting to the weld groove portion (see FIGS. 5 and 6). In other words, since the protruding portion 9 is interposed, the end surfaces of the upper and lower steel pipes face each other with a gap of a design size at the time of longitudinal welding.

  The band-shaped main body 2 is formed with a window 7 (opening) for tack welding. In this embodiment, as an example, six windows are formed at equal intervals in the circumferential direction. These windows 7, 7 ... are each formed at a position facing the joint (seam) of the upper and lower steel pipes. That is, in the range in which the window 7 is formed, the opposing portion (the part to be tack welded) of the ends of the upper and lower steel pipes is exposed from the window. Therefore, it is possible to weld the joints of the upper and lower steel pipes through the window 7 during tack welding.

  In the present embodiment, the band-shaped main body 2 can be divided into two as shown in FIG. When the hinge plates 24 and 34 are connected with the eyebolts 6 from the divided state as shown in the same figure to form a hinge, an opening / closing operation such that the inner diameter of the band-shaped main body 2 is expanded or contracted becomes possible. Further, when the bolt 4 is passed through the brackets 24 and 34 and tightened with the nut 5 screwed, the inner side of the band-shaped body 2 gradually narrows, and the steel pipes are welded to the steel pipes to be longitudinally connected. The jig 1 can be securely fixed.

(First embodiment of circumferential welding method using steel welding jig)
Next, an example of the circumferential welding method for steel pipes will be described mainly based on the procedure diagrams shown in FIGS. 3A to 3F. Note that procedures A to F described below correspond to FIGS. 3A to 3F, respectively. Moreover, in the following embodiment, a steel pipe pile is illustrated as a typical example of steel materials.

<Procedure A> Attaching the backing ring As shown in FIG. 3A, the backing ring 13 is attached to the lower pile 12 of the upper and lower steel pipe piles to be longitudinally joined by spot welding. The backing ring 13 has a diameter inscribed in the inner peripheral surface on the upper end side of the lower pile 12. The ring is welded to the inner peripheral surface of the upper end of the lower pile so that the backing ring 13 partially protrudes from the upper end of the lower pile.

<Procedure B> Attachment of Steel Material Welding Jig In this step, the steel material welding jig 1 is attached to the upper end of the lower pile 12 as shown in FIG. 3B. When attaching the steel welding jig 1, the half-cracked members 21 and 31 of the disassembled welding jig shown in FIG. 2 are respectively directed to the outer peripheral surface on the upper end side of the lower pile, and the eyebolt 6 is attached in that state. Both hinge plates are connected through the hinge plates 26 and 36.

  At that time, the half-cracked members 21 and 31 are positioned at a height position at which the upper ends of the lower piles 12 can be visually observed from all the windows 7 (that is, at positions where the upper edge of the lower pile 12 is exposed from the windows 7). To do.

  Subsequently, the nut 5 is screwed through the bolts 4 to the brackets 24 and 34 of the half-cracked members 21 and 31, and the bolts 4 are lightly tightened. Thereby, the steel material welding jig 1 is temporarily fixed to the upper end of the lower pile 12 (fixed loosely).

<Procedure C> Insertion of Upper Pile Subsequently, the upper pile 11 is inserted into the band-shaped main body 2 of the welding jig attached loosely in the above procedure. In this insertion process, the upper pile 11 is first guided by the outer band-shaped main body 2 as shown in FIG. 4, and further guided by the inner backing ring 13 when approaching the lower pile 12. Then, after being guided by the band-shaped main body 2 and the backing ring 13, finally, the groove surface 15 at the lower end of the upper pile rides on the tapered surface 91 of the projecting portion 9 and deposits a load.

  Thus, in this embodiment, since this upper pile 11 is guided by the band-shaped main body 2 and the backing ring 13 in the process of inserting the upper pile 11 into the band-shaped main body 2 and suspending it (that is, the outer side and the inner side). Since it is guided on both sides, provisional positioning of the upper and lower steel pipe piles 11 and 12 to be longitudinally connected is easy.

  And if insertion of the upper pile 11 is continued, the upper pile 11 guided by the band-shaped main body 2 and the backing member 13 will contact | abut the taper surface 91 of the protrusion part 9, as shown in FIG. That is, the upper end and the lower end of the steel pipe pile face each other with the protruding portion 9 interposed between the upper and lower steel pipe piles 11 and 12. Moreover, in the site | part in which the protrusion part 9 is not formed (namely, site | part exposed to the exterior of the jig | tool by the window 7), the upper end and the lower end of the steel pipe piles 11 and 12 have opposed the gap of design size. This gap plays a role as a route interval (route gap) in tack welding described later.

<Procedure D> Eliminating mistakes by tightening the band-shaped body At the stage of completing the above-described procedure C, provisional positioning (generally positioning) of the upper and lower steel pipe piles 11 and 12 to be longitudinally connected is completed. Since the main body 2 is tightened loosely, there is a possibility that a misunderstanding (displacement of the end surfaces of the upper pile 11 and the lower pile 12) remains at the time when the insertion of the upper pile 11 is completed. Therefore, in this procedure D, the bolt 4 is further tightened to increase the tightening force of the band-shaped main body 2.

  Since the band-shaped main body 2 is attached so as to surround the joint (seam) between the upper end of the lower pile and the upper end of the lower pile, by tightening the band-shaped main body 2 strongly, The wall forcibly presses the joint (seam) of the upper and lower steel pipe piles. As a result, the upper pile lower end and the lower pile upper end are displaced toward the concentric position so that the outer peripheral surfaces of the upper pile lower end side and the lower pile upper end side are aligned. As a result, the misalignment is eliminated.

  Therefore, since the alignment in the height direction is performed by the protruding portion 9 and the alignment in the horizontal direction is performed by the tightened band-shaped main body 2, the upper and lower steel pipe piles 11 and 12 are easily positioned at the design position. can do. In addition, the effect which ensures a predetermined | prescribed root space | interval (namely, the space | interval of the predetermined size of an up-down direction) is achieved by the protrusion part 9 which attached the taper, and the effect which eliminates a mistake by fastening the band-shaped main body 2 is achieved. Is done.

<Procedure E> Temporary Welding After eliminating the mistake in the above procedure, the upper pile lower end and the lower pile upper end are tack welded with the steel material welding jig 1 attached. In this tack welding, a welding rod or the like is inserted through a window 7 as shown in FIG. Since the joints (joints) of the upper and lower steel pipe piles 11 and 12 are exposed from the window 7, the upper pile 11 and the lower pile 12 can be temporarily welded with the welding jig 1 attached. it can.

  In step E, the groove surface 15 at the lower end of the upper pile is on the tapered surface 91 of the protruding portion 9 (that is, the lower end of the upper pile and the upper end of the lower pile are not in contact), so this temporary welding Then, the route interval as designed is secured.

<Procedure F> Main Welding When tack welding is completed in the above procedure, the steel material welding jig 1 is removed from the steel pipe piles 11 and 12 in a procedure reverse to the procedure B described above. In addition, since tack welding is already completed at this time, even if the steel material welding jig 1 is removed, there is no mistake. In addition, a predetermined gap (the protrusion 9 was fitted here) is secured between the lower end of the upper pile and the upper end of the lower pile, and this state is maintained by tack welding. Even in the main welding, the route interval as designed is secured.

  And after removing the jig | tool 1 for steel material welding, the welding around the junction part of the upper pile 11 and the lower pile 12 is main-welded, and the welding of a steel pipe pile is completed.

According to the welding method including the procedures A to F described above, it is not necessary to weld a guide plate such as an erection piece in order to eliminate misunderstanding and alignment of the steel pipe piles 11 and 12 to be longitudinally connected. This saves you the trouble of welding.
Moreover, the steel pipe piles 11 and 12 to be longitudinally connected do not cause alteration (due to heat during welding).
Moreover, longitudinal welding can be completed in a shorter time than before.
In addition, since the upper and lower steel pipe piles 11 and 12 are securely fixed by the band-shaped main body 2 and the joint portion is temporarily welded in that state, there is a difference in the upper and lower steel pipe piles during temporary welding and subsequent main welding. There is no.

(Second Embodiment of Circumferential Welding Method Using Steel Welding Jig)
Next, 2nd Embodiment of the circumferential welding method of a steel pipe pile is described based on the procedure figure shown to FIG. 7A-FIG. 7I.

  Of the procedures shown in FIGS. 7A to 7I, FIGS. 7A to 7E are the same as the procedures shown in FIGS. 3A to 3E, respectively. That is, the welding method of the second embodiment is the same as the procedure of the first embodiment described above until tack welding. Therefore, for details of the procedures related to FIGS. 7A to 7E, refer to <Procedure A> to <Procedure E> in the above-described embodiment.

  Hereinafter, the procedure shown in FIGS. 7F to I will be described in detail. It should be noted that procedures F to I described below correspond to FIGS. 7F to 7I, respectively. Moreover, in the following embodiment, a steel pipe pile is illustrated as a typical example of steel materials.

<Procedure F> Attaching the Band-shaped Spacer After the tack welding in the procedure shown in FIG. 7E is completed, the steel material welding jig 1 is then fixed to the joints (joint portions) of the steel pipe piles 11 and 12. The band-like spacer 41 is placed on the welding jig 1 and fixed. The band-like spacer 41 (positioning member) is a positioning member for positioning a guide rail described later at a predetermined design position. The band-shaped spacer 41 has two half-cracked parts made of steel, rubber, or the like, and a bolt 43 that connects the half-cracked parts in a ring shape and tightens them in the direction of diameter reduction.

  When this band-like spacer 41 is attached, each half-cracked portion is placed directly above the upper end portion of the steel material welding jig 1 and is applied to the outer peripheral surface of the upper steel pipe pile 11. Then, while connecting two half crack parts with the several volt | bolt 43, each volt | bolt 43 is fastened and the band-shaped spacer 41 is fixed to the outer peripheral surface of the upper steel pipe pile 11. FIG.

<Procedure G> Attaching the Guide Rail Subsequently, a guide rail 51 (traveling rail) for guiding the welding apparatus is attached immediately above the band-shaped spacer 41 fixed in Procedure F. The guide rail 51 has a belt-like portion formed so as to surround the outer peripheral surface of the upper steel pipe pile 11 and a bolt 53 for fixing the belt-like portion to the steel pipe pile.

  Thus, by attaching the guide rail 51 with the fixed steel welding jig 1 as a reference position, the distance between the joint (seam) of the steel pipe piles 11 and 12 and the guide rail 51 is set as designed. It can be kept at a separation distance.

<Procedure H> Removal of Steel Welding Jig and Band-shaped Spacer After the guide rail 51 is securely fixed to the upper steel pipe pile 11 in Procedure G, the steel material welding jig 1 and the band-shaped spacer 41 are subsequently removed. In addition, since tack welding has already been completed at this time, even if the steel material welding jig 1 is removed, there is no difference between the steel pipe piles 11 and 12. Further, since the guide rail 51 is firmly fixed, even if the band-shaped spacer 41 is removed, the guide rail 51 is not displaced.

<Procedure I> Attaching the welding device and circumferential welding using the welding device Subsequently, the welding device 61 is set on the guide rail 51 attached in the procedure H. As an example, the welding apparatus 61 illustrated in FIG. 7I includes a welding carriage 63 that can travel along the guide rail 51 and a welding torch 65 supported by the welding carriage 63 at a predetermined height position.

  As shown in FIG. 7I, when the welding carriage 63 and the welding torch 65 are attached, the height, separation, and angle of the welding device 61 are adjusted. Subsequently, without turning on electricity, the welding carriage 63 is moved, and the streets of the welding torch 65 are confirmed.

  When the above preparation is completed, the main welding is performed with respect to the joint portions (joints) of the steel pipe piles 11 and 12 by using the welding device 61 that can travel along the guide rails 51. In this main welding, the front end portion of the welding torch 65 moves along the joint portion (seam) of the steel pipe piles 11 and 12 without shaking, so that the joint portion can be accurately main welded without being displaced.

In this embodiment, as shown in FIG. 7G, the guide rail 51 is positioned at the design position using the band-shaped spacer 41. However, such a band-shaped spacer may be omitted. That is, as shown in FIG. 8, the steel material welding jig 1 itself is used as a guide rail positioning means, and is placed on the steel material welding jig 1 so that the guide rail 51 is designed. It is also possible to attach so that it comes to.
However, when the specifications such as the shape and dimensions of the welding apparatus are changed, there is a possibility that the guide rail cannot be positioned at the design height position if the guide rail 51 is placed directly on the steel material welding jig 1. In such a case, the guide rail 51 can be easily mounted at a height position as designed by using a positioning member such as the band-shaped spacer described above.

  As mentioned above, although embodiment of the jig for welding steel materials and the welding method was described, embodiment mentioned above is an example and the technical scope of the present invention is not limited to this. For example, in the above embodiment, steel pipes (steel pipe piles) are cited as an example of steel materials, but the welding jig and welding method of the present invention are also applied to steel pipes having a circular cross section such as steel pipe sheet piles and casing pipes. Is possible. Further, the present invention is not limited to the above-described steel pipes, and can be applied to welding at the time of adding (joining) various steel materials such as rectangular steel pipes and H-shaped steels. Moreover, although the case where the 1st and 2nd steel materials have the same cross section is mentioned as an example in the above-mentioned embodiment, even when two steel materials have a different cross section, if the jig for welding only for the steel materials to combine is used. In addition, if necessary, a joining position between the two steel materials can be secured by appropriately inserting and fixing a spacer appropriately inside the band-shaped main body of the welding jig.

1 Steel welding jig (positioning device)
2 Substantially band-shaped body (band-shaped body)
4 bolts (tightening means)
5 Nut (tightening means)
6 Eyebolt 7 Window (opening)
8 Hinge 9 Protruding part 11 Upper pile (steel pipes / first steel)
12 Lower pile (steel pipes / second steel)
13 Backing ring (backing member)
15 Groove surface 21 Half crack member 24 Bracket (flange)
26 Hinge plate 31 Half crack member 34 Bracket (flange)
36 Hinge plate 41 Band spacer (positioning member / positioning band / temporary receiving band)
43 Bolt 51 Guide rail (guide member / running rail)
53 Bolt 61 Welding device 63 Welding cart 65 Welding torch 91 Tapered surface

Claims (5)

A substantially band-shaped body that is attached so as to wind the joint between the first steel material and the second steel material;
Tightening means for tightening the band-shaped body;
An opening for welding formed in the band-shaped body so as to face the joint,
A jig for welding steel material.   The welding jig according to claim 1, wherein a projecting portion for securing a route interval is provided on an inner peripheral surface side of the band-shaped main body. Attaching a steel welding jig to a position where the joint between the first steel and the second steel is wound;
Through the opening of the band-shaped main body of the welding jig, the step of temporarily welding the joint,
A step of performing the main welding of the joint with the welding jig removed;
A method for welding steel, characterized by comprising: Attaching a steel welding jig to a position where the joint between the first steel and the second steel is wound;
Through the opening of the band-shaped main body of the welding jig, the step of temporarily welding the joint,
Using the welding jig as a direct or indirect positioning means, attaching a guide rail for a welding apparatus to a predetermined position of a steel material; and
Using the welding device movably provided along the guide rail, and performing a main welding of the joint portion;
A method for welding steel, characterized by comprising: Attaching a steel welding jig to a position where the joint between the first steel and the second steel is wound;
Through the opening of the band-shaped main body of the welding jig, the step of temporarily welding the joint,
Using the welding jig, attaching the positioning member to a predetermined position of the steel material,
Using the positioning member, attaching a guide rail for a welding apparatus to a predetermined position of the steel material,
Using the welding device movably provided along the guide rail, and performing a main welding of the joint portion;
A method for welding steel, characterized by comprising: