JP7154171B2 - Welding method for assembly box columns - Google Patents

Description

The present invention relates to a method for welding prefabricated BOX columns for constructing architectural columns.

Joint welding of square steel pipe columns at construction sites is often performed manually by welding technicians.
In large buildings such as high-rise buildings, the dimension of one side of a box column is about 800 mm, and the plate thickness is about 80 mm. .
On the other hand, utilization of welding robots as seen in Patent Document 1 and Patent Document 2 has also been proposed.
However, at a construction site, it is necessary to stack short rectangular steel pipes and hold the position so as to maintain continuity while welding while temporarily supporting the erection pieces provided on the upper and lower steel pipes. and erection jigs for temporary support get in the way, and there are parts where welding work by robots cannot be performed.
Due to these circumstances, even if robot welding can be performed partially, manual work remains.
Also, if a section separated by an erection piece or the like is welded from one side, distortion will occur due to the preceding welded portion, and the continuity will be biased. of welders or two welding robots are required.
In other words, the straight parts of the facing surfaces of one column are welded, and the corner parts are laminated while being processed with a grinder. , work efficiency decreases. There is a shortage of workers, and improvements in welding technology are required.

Pipe-type steel columns used in the construction of high-rise buildings include cold-formed square steel pipes (generally called "steel pipe columns") and welded four-sided box columns ("assembled BOX columns", "BOX columns", "box columns"). ”, hereinafter referred to as “assembled BOX pillar”). Assembled BOX pillars can be made with a larger diameter than steel pipe pillars, and are more suitable for pillar members of skyscrapers. Four thick plates are welded together to create steel pillars with a square or rectangular cross section. is created.
A steel pipe column is formed by bending a steel plate that has been rolled into a plate shape to form a square column, so that corners are rounded. On the other hand, since the assembly box column is assembled by welding four steel plates, the corners are formed at right angles.
As examples of automatic welding for welding square steel pipe columns used at construction sites, there are the following two proposals, for example.
In Patent Document 1 (Japanese Patent Laid-Open No. 4-351272) and Patent Document 2 (Japanese Patent Laid-Open No. 2000-135594), a lap rail is provided near the joint of upper and lower steel pipes, and a welding robot is run on the outer rail. There has been proposed an automatic welding device that performs welding by
However, at actual worksites, there are erection pieces and erection jigs straddling the joints in order to control and maintain the straightness of the upper and lower square steel pipes. These proposed techniques cannot be applied in the case.
Patent Document 3 (Japanese Patent Application Laid-Open No. 8-229676) describes a method for welding an assembly BOX column, in which an erection piece is attached to the corner of the column and temporarily fixed with a erection jig, and a welding robot is used. It has been proposed to weld the It is disclosed that a welding torch attached to a welding robot separates and avoids the provisional fixing device of the corner and wraps around to the next side to perform welding. As described in the specification, the present invention is a welding method that cannot be applied to assembly BOX columns that have erection pieces on the flat surfaces that are commonly used.

JP-A-04-351272 JP-A-2000-135594 JP-A-08-229676

An object of the present invention is to develop a welding method using a welding robot in field welding of assembly BOX columns.

1. Upper and lower assembly BOX columns that are temporarily fixed by connecting the erection pieces with erection jigs using assembly BOX columns with erection pieces installed on the flat surface, and are temporarily fixed to each of the four corners. A method of welding upper and lower assembly BOX columns having eight corners existing between the points using a welding robot,
Insert the welded partition plate into the corner groove,
welding at least a pair of diagonal corners or a pair of opposing corners with a welding robot;
After welding of one corner side adjacent to each corner is completed, the inserted welding partition plate is removed and the other corner side is welded by a welding robot.
A method of welding an assembly BOX column with a welding robot, characterized by:
2. 1. A pair of diagonal corners are welded at intervals of 90 degrees. A method of welding the described assembly BOX column with a welding robot.
3. Upper and lower assembly BOX columns that are temporarily fixed by connecting the erection pieces with erection jigs using assembly BOX columns with erection pieces installed on the flat surface, and are temporarily fixed to each of the four corners. A method of welding upper and lower assembly BOX columns having eight corners existing between the points using a welding robot,
Insert the welded partition plate into the corner groove,
A pair of opposing sides are welded by a welding robot for each pair of diagonal corners,
Remove the inserted welded partition plate,
welding the other pair of opposing sides with a welding robot;
A method of welding an assembly BOX column with a welding robot, characterized by:
4. An assembly BOX pillar in which a plurality of erection pieces are installed on one flat surface is used, and the erection pieces are connected by a erection jig to temporarily fix the upper and lower assembly BOX pillars. Using a welding robot, the upper and lower assembled BOX columns having eight corner side portions existing between the temporarily fixed points and the central side portions existing between the adjacent temporarily fixed points A method of welding, comprising:
Welding the opposing central parts using a welding robot,
Before welding the corners, insert the welding partition plate into the grooves of the four corners,
Weld the diagonal corners,
Remove the welding partition plate from the corner of the corner that has been welded, and weld the other corner that is in contact with the corner.
A method of welding an assembly BOX column with a welding robot, characterized by:
5. The erection jig that is no longer necessary for maintaining the temporary fixation of the upper and lower assembly BOX columns due to the partially completed welding is removed from the erection piece, and welding is continued by the welding robot. ~ 4. 3. A method of welding the assembly BOX column according to any one of 1 above with a welding robot.
6. 1. The welding partition plate is made of ceramic. ~ 5. 3. A method of welding the assembly BOX column according to any one of 1 above with a welding robot.
7. By connecting the rear end side of the welding torch to the base of the welding robot, the welding robot lengthens the length from the base to the tip of the torch. It is characterized by welding the joints of the BOX columns or the joints of the assembly BOX columns between the upper and lower erection pieces. ~6. 3. A method of welding the assembly BOX column according to any one of 1 above with a welding robot.

1. Welding of the assembly BOX column has grooves at right-angled corners, and the welding robot cannot rotate smoothly while welding the corners. In the present invention, a welding partition plate is inserted into the groove of the corner, the groove on the side to be welded first is welded, and the bead end stopped by the welding partition plate is flattened, and then the other side is welded. can be welded as it is with a welding robot. The welded partition plate is removed after one side adjacent to the corner is welded.
In addition, the erection jig that is an assembly BOX column having an erection piece on the flat surface and temporarily fixes the upper and lower assembly BOX columns is temporarily fixed by welding that is partially advanced and a part of the erection jig. It is possible to remove the erection jig that can be removed at the stage where the is maintained, and after that, the welding robot can continuously weld the space between the upper and lower erection pieces.
As a result, the connection surface of the weld bead formed prior to the corner is formed as a flat surface without irregularities, so that the subsequent welding can be performed smoothly, and the weld connection surface is also solid without causing defects. Welding can be constructed with
In the present invention, as a general rule, the first partial welding is started from diagonally opposed points or opposite points. At the stage of expanding the welded part, when temporary fixation by welding is demonstrated, the erection jig is removed and the section that can be continuously welded is extended, proposing a method to improve the welding efficiency of the welding robot. ing.
2. In addition, the present invention has developed a specific method of welding an assembly BOX column with a welding partition plate inserted in the corner and an erection piece on the flat surface using two welding robots.
One is a method of performing very stable welding by sequentially welding diagonal corners with two welding robots. Welding of the corners is performed four times at intervals of 90 degrees. In addition, the welding part between the temporary fixing part and the corner, which is the welding part of the assembly BOX column, is the corner side part. Therefore, there are eight corner sides. In the case of an assembly BOX column having one erection piece on each plane, welding of the eight corners completes the entire welding of the assembly BOX column.
3. Second, the left and right corners of a pair of opposing welding sides are welded using a welding robot, and the welding of the other opposing welding sides is performed by removing the assembly jig and welding at once with the welding robot. It is a way to If at least one pair of opposing sides are welded, the temporary fixation can be maintained by welding alone, and depending on the conditions, when welding of one pair of opposing corner sides is completed, the erection jig can be installed. It may be possible to remove it.
4. Third, if there are a plurality of erection pieces, such as two, on one plane of the assembly BOX column, two or more temporary fixing parts can be created on one plane by the erection jig. In this method, the side to be welded between the temporarily fixed points is defined as the center of the side, and the opposing center of the side is welded first by two welding robots. If the center side weld allows the erection fixture to be removed, it can be removed and the remaining corner side and center side welded.
5. In the present invention, by installing a rail that goes around the assembly BOX column with curved corners, and attaching a welding robot to the rail and moving it, the entire assembly can be welded without replacing the welding robot. In addition, by providing a welding partition plate on the side where welding precedes, the connection surface of the welding end formed at the corner is formed neatly, and by devising a long welding torch, swinging welding is performed during the erection jig. It is possible to insert and weld between the upper and lower erection pieces, so by moving the welding robot to the welding point, welding can be performed by the welding robot, and manual welding by a welder can be eliminated.

It is a figure which shows the basic composition of an assembly BOX column. FIG. 10 is an enlarged view of a welded portion of the vertically stacked assembly BOX pillars; FIG. 4 is a view showing a configuration cross-section of a welded portion of an assembly BOX column; 1 is a diagram showing an outline of Embodiment 1. FIG. The "o" mark shown in the figure indicates the location to be welded by swinging the neck of the welding torch. This also applies to other figures. Circled numbers indicate the order of welding. This also applies to other drawings. "⇔" shown on the outside of the assembly BOX pillar indicates the welding point, the hunting point indicates the point where welding is completed, and the white area indicates the point to be welded in that process. This also applies to other figures. The "▽" mark indicates the groove at the corner where the welded partition plate is inserted. This also applies to other figures. FIG. 10 is a diagram showing an outline of Embodiment 2; FIG. 10 is a diagram showing an outline of embodiment 3; FIG. 11 is a diagram showing an outline of embodiment 4; FIG. 10 is a diagram showing an outline of embodiment 5; FIG. 11 is a diagram showing an outline of Embodiment 6; FIG. 4 is a diagram showing an example of a welded partition plate; It is a figure which shows the outline of this welding robot. FIG. 5 is a diagram showing an example of movement of a welding robot using bar-shaped rails; An example of movement of a welding robot using a loop rail is shown. The figure which shows the usage condition of a welding partition plate.

The present invention is a method for welding assembled BOX columns that are temporarily fixed vertically at a construction site using a welding robot. In this method, one welding side of the part is welded, the welding partition plate is removed, and the other welding side is welded. This allows the welding robot to finish welding one weld side, interrupt welding once, and start welding the other weld side. The bead coming out of the welding torch abuts against the welding partition plate provided at the groove of the corner, so that the corner welding end face for connection is formed neatly. Therefore, it is possible to continuously weld the welding end face of the corner from the other side by a welding robot.
At a construction site, a new assembly BOX pillar is stacked on top of an existing assembly BOX pillar installed in advance, and erection pieces provided on the upper and lower pillars are temporarily fixed with erection jigs and welded. Welding temporarily stops at the temporary fixing device, but the present invention proposes a method to reduce the number of such stops. Developed a long type welding torch, tilted the welding torch and extended it from near the erection jig to between the upper and lower erection pieces to allow welding, and also removed the erection jig and removed the upper and lower erection pieces The tip of the torch faces the groove from between the gaps and passes through the welding pass to enable continuous welding. In the process of sequentially welding the facing parts of the pillars of the assembly box with two welding robots, at the stage when temporary fixation can be maintained by partial welding, part of the erection jig is removed, and the upper and lower erections The gap between the pieces was opened to allow the welding torch to pass through and allow continuous welding as described above.
These measures expand the range in which the welding robot can be continuously driven. The erection piece is removed by gas cutting after the welding of the entire circumference is completed.

The main methods of welding assembly BOX columns are as follows. One method is that the assembly box column has 8 welding sides on both sides of the 4 corners, and these 8 welding sides are set as a set of two diagonally positioned sides, and two welding machines are used. It is a method of welding with a robot. In the second method, the opposing sides are welded by a welding robot in halves divided by temporary fixation, and removed by a erection jig halfway through or at the stage when welding of the opposing sides is completed. The other opposing sides are welded after removing the erection jig before starting welding. The third method is to weld the two temporary fixings first when there are two temporary fixings on one side, remove the erection jig, and weld the left and right corners. be. In the fourth method, when there are two temporary fixings on one side, after welding the corner sides on both sides of the opposing corner, remove the erection jig and weld the remaining part. It is a way to proceed. In the fifth method, if there are two temporary fixings on one side, start welding from the corner side of the opposing corner for a pair of opposing sides and remove the erection jig for that side. In this method, the entire remaining side is welded, and for the other opposing side, the erection jig is first removed and the entire side is welded at once.

The erection piece is removed by gas cutting after welding is completed. If gas cutting work is performed during welding, welding cannot be performed unless the product temperature of the steel pipe, which rises due to the cutting, is cooled in addition to the time required for the cutting work. becomes. In the present invention, since the fusion cutting of the erection piece can be performed as a post-welding process, the fusion cutting of the erection piece can be separated from the limiting conditions of welding.

(Embodiment 1)
Description will be made below with reference to the drawings.
First, the basics of the state in which the assembly box columns are stacked vertically will be explained with reference to FIGS. 1 to 3. FIG.
FIG. 1 shows the basic structure of an assembly BOX column, (a) is a side view, and (b) is a sectional view. Figure 2 shows an enlarged view of the welded part of the assembled BOX column stacked vertically, (a) is an overall schematic view, (b) is a view of the welded partition plate inserted into the corner groove, and (c) is welded. Finished view, (d) is an enlarged view of the corner groove with the welded partition plate inserted into the corner groove, (e) is an enlarged view showing the state where the groove part of (d) is welded, (f ) is a view showing the bead end face with the welded partition plate removed after welding. FIG. 3 shows a cross-section of the basic configuration at the weld.
The assembly BOX column is assembled by aligning four steel plates on each side in a square shape and welding the aligning portions. Therefore, the corners 4 are at right angles. At the construction site, the lower end of the upper assembly BOX column 1a is placed on the upper end of the existing lower assembly BOX column 1b that has already been assembled, the upper and lower assembly BOX columns are temporarily fixed, and the butt portions are welded to temporarily fix. release. In general, the upper end surface of the steel plate of the lower assembly BOX column 1b is formed flat, and the lower end surface of the steel plate of the upper assembly BOX column 1a is inclined. This state is shown in FIGS. 2(a), 2(b) and 2(d). Therefore, the welding edge 5 forming the groove is flat on the lower side and inclined to open outward on the upper side. The welded partition plate 3 is inserted into the groove of the corner formed in this way.

The temporarily fixed state is shown in FIG. Short flat plates are welded to the upper and lower assembly BOX columns to form erection pieces 12. The upper assembly BOX column 1a is provided with erection pieces 12a1, 12b1, 12c1, and 12d1 on its four sides. Election pieces 12a2, 12b2, 12c2, and 12d2 are provided on four sides of the lower assembly BOX pillar 1b. Each upper and lower erection piece has holes for bolts. A flat plate erection jig 13 having bolt holes formed to sandwich the upper and lower erection pieces from both sides is applied, and bolts 14 are inserted into each bolt hole and tightened with nuts to temporarily fix the upper and lower assembly BOX columns. be done. There are erection jigs 13a, 13b, 13c, and 13d on four sides, and temporary fixing is performed on the four sides. There is a gap between the erection jig 13 and the bevel 5, and the gap can be welded by swinging the neck of a long type welding torch as will be described later.

FIG. 3 shows the basic configuration of the cross section of the welded portion, and there are four welded sides 5a, 5b, 5c, and 5d to be welded, and the welded side 5 is divided into two by a temporary fixing jig. The space between the corners 4a, 4b, 4c, 4d and the temporary fixing jig is divided into eight corners 51a, 51b, 51c, 51d, 51e, 51f, 51g, 51h.
The outline of the welding method of the assembly BOX column using the welding partition plate will be described according to FIG.
The upper surface of the lower assembly BOX pillar 1b is formed flat, and the lower surface of the upper assembly BOX pillar 1a, which is tapered outwardly, is superimposed on the flat surface, and the upper and lower surfaces are in contact with each other. 2(a). The welding edge 5 is formed with a groove in which a welding bead is filled in a space having a triangular cross section formed by the taper. A welded partition plate 3 is prepared to be inserted into the groove of the corner. FIG. 2(b) shows a state in which the welded partition plates 3, 3 are inserted into grooves at the corners at both ends, and FIG. 2(d) shows an enlarged state. In the illustrated state, the welded partition plate 3 is inserted so as to abut on the tapered surface on the right side of the ridgeline of the groove of the corner. As a result, it is possible to form the corner end face of the weld bead 53 that fills the groove on the front side shown in the figure.
This filled state is shown in FIG. 2(e). FIG. 2(f) shows a state in which the welded corner end surface 54 of the welded bead 53 at the corner where the welded partition plate is removed is formed at an angle different from that of (e). As shown in FIG. 2( f ), the welded corner end face 54 formed in contact with the side surface of the welded partition plate is formed flat, and from the groove side of the unfilled welded side 5 seen from the front, When welding, a clean weld joint surface can be obtained. FIG. 2(c) shows the state of the upper and lower assembled BOX columns that are welded together in this manner.

FIG. 4 shows a schematic configuration of the welding process of Embodiment 1. As shown in FIG. In Embodiment 1, welding proceeds in the following steps.
4 to 10, the symbols "○" mark indicate the location to be welded by swinging the head of the welding torch, and the "circled number" indicates the order of welding, outside the assembly box column. "⇔" indicates the welding point, hunting indicates the point where welding has been completed, white indicates the point to be welded in that process, and "▽" mark indicates the groove at the corner where the welding partition plate is inserted. is shown.

First step: Welding partition plates 3a and 3c are inserted into the grooves of corners 4a and 4c.
Second step: Welding the diagonally opposite corners 51b and 51f with two welding robots. The grooves between the upper and lower erection pieces 12a, 12c on the erection jigs 13a, 13c are welded by swinging the welding torch. At the corners 4a and 4c, the welding beads abut against the welding partition plates 3a and 3c, resulting in a clean surface finish. However, since the welding torch can be inserted between the erection pieces for welding in the seventh step in which the erection jig is removed, it is not always necessary to perform swing welding in the second step. The welded partition plates 3a, 3c are removed during the fifth step after the end of the second step.
Third step: Welding partition plates 3b and 3d are inserted into the grooves of the corners 4b and 4d.
Fourth step: Welding the diagonally opposite corners 51d and 51h by two welding robots. The grooves between the upper and lower erection pieces 12b, 12d on the erection jigs 13b, 13d are welded by swinging the welding torch. However, since the welding torch can be inserted between the erection pieces in the sixth step in which the erection jig is removed, it is not always necessary to perform swing welding in the second step. At the corners 4b and 4d, the welding beads come into contact with the welding partition plates 3b and 3d, resulting in a clean surface finish.

Fifth step: Remove all the erection jigs 13, and remove any remaining welding partition plate 3. Half of each weld side is welded, and the temporary fixation can be maintained even if the erection jig is removed.
Sixth step: Welding the diagonally opposite corners 51c and 51g with two welding robots. 4a and 4c from which the welding partition plates have been removed have clean weld end faces, and can be welded as they are by a welding robot. Further, since the erection jigs 13b and 13d are removed, the space between the upper and lower erection pieces is exposed, and a welding torch can be inserted to perform continuous welding. Since it is easier than oscillating welding, the oscillating welding of the four steps can be omitted.
Seventh step: Welding the corner sides 51e and 51a located diagonally with two welding robots. 4b and 4d from which the welding partition plates have been removed have clean weld end faces, and can be welded as they are by a welding robot. Further, since the erection jigs 13a and 13c are removed, the space between the upper and lower erection pieces is exposed, and a welding torch can be inserted to perform continuous welding. Since it is easier than oscillating welding, the oscillating welding of the two steps can be omitted.

The welding robot is taught before each weld.
Also, the welding robot moves using a traveling rail attached to the periphery of the assembly BOX column.
The erection piece is fused after welding is finished.

(Embodiment 2)
Embodiment 2 will be described with reference to FIG.
In this method, welding is performed by focusing on the opposing sides. In this method, the erection jig is removed after the welding of a pair of opposing sides is completed, and the other opposing sides are continuously welded. Since there is an erection jig, the side to be welded first starts with one corner side, and when welding the next corner side, the already welded corner side and the erection on the other side are welded. Since temporary fixation can be maintained by the installation jig, the erection jig for the side can be removed.
Specifically, welding proceeds in the following steps.
First step: Welding partition plates 3b and 3d are inserted into the grooves of the corners 4b and 4d.
Second step: Two welding robots are used to weld the corner sides 51d and 51h located diagonally in the pair of opposing sides 5b and 5d. The grooves between the upper and lower erection pieces 12b, 12d on the erection jigs 13b, 13d are welded by swinging the welding torch. At the corners 4b and 4d, the welding beads come into contact with the welding partition plates 3b and 3d, resulting in a clean surface finish. The welded partition plates 3b, 3d are removed during the fifth step after the end of the second step.
Third step: Welding partition plates 3a and 3c are inserted into the grooves of the corners 4a and 4c.
Fourth step: The corner sides 51c and 51g located at the other diagonal of the pair of opposing sides 5b and 5d are welded by two welding robots from the first layer to the n layers. The grooves between the upper and lower erection pieces 12b, 12d on the erection jigs 13b, 13d are welded by swinging the welding torch. This n-layer is a welded layer that can maintain temporary fixation even when the erection jigs 13b and 13d are removed. At the corners 4a and 4c, the welding beads abut against the welding partition plates 3a and 3c, resulting in a clean surface finish.

Fifth step: The erection jigs 13b and 13d are removed, and the corner portions 51c and 51g are welded up to the finish layer. In this case, welding is performed by inserting a welding torch into the groove between the erection pieces 12b and 12d. The existing welded corners 51d and 51h, the corners 51c and 51g where the initial layers are welded, and the upper and lower assembly BOX columns to which the erection jigs 13a and 13c are attached are sufficiently maintained to be temporarily fixed. Therefore, the erection jigs 13b and 13d can be removed at the beginning of this process. Then, the welding torch can be inserted into the groove between the erection pieces 12b and 12d for welding, which makes the welding work easier and more efficient.
Sixth step: removing the welding partition plates 3a and 3c, and removing the erection jigs 13a and 13c. Since the opposing sides 5b and 5d are welded, the upper and lower assembly BOX columns can be temporarily fixed even if the erection jigs 13a and 13c are removed.
Seventh step: A welding robot passes and welds a side 5c composed of corner side portions 51e and 51f opposed to a side 5a composed of corner side portions 51a and 51b on both sides of the erection piece 12a. It is efficient because the entire length of the side can be welded at once.

In Embodiment 2, if the temporary fixation of the upper and lower assembly BOX columns can be maintained by welding the corner portions 51d and 51h and the erection jigs 13a and 13c in the second step, the erection jigs are used. 13b, 13d can be removed and the corners 51c, 51g can be welded from the first layer to the finishing layer. In this case, the fourth and fifth steps are combined.
The welding robot is taught before each welding.
Also, the welding robot moves using a traveling rail attached to the periphery of the assembly BOX column.
The erection piece is fused after welding is finished.

(Embodiment 3)
Embodiment 3 will be described with reference to FIG.
A welding method for assembly BOX columns having one erection piece 16a, 16d on a pair of opposing plane portions and two erection pieces 16b, 16c, 16e, 16f on the other opposing plane portions. be. The upper and lower erection pieces of the upper and lower assembly BOX pillars are temporarily fixed at six locations by erection jigs.
The assembly BOX pillars 1a and 1b stacked vertically have four corner portions 4, eight corner side portions 51, and central side portions 52b and 52d existing between two erection pieces. The corner side portion and the side center portion are welded points.
Schematically, it is a method in which the sides 5a and 5b having one erection piece are welded first, and the sides 5b and 5c having two erection pieces are welded later.
Specifically, welding proceeds in the following steps.
First step: Welding partition plates 3b and 3d are inserted into the grooves of the corners 4b and 4d.
Second step: two welding robots are used to weld the diagonal corners 51a and 51e of the pair of opposing sides 5a and 5c. The grooves between the upper and lower erection pieces 16a, 16d on the erection jigs 17a, 17d are welded by swinging the welding torch. At the corners 4b and 4d, the welding beads come into contact with the welding partition plates 3b and 3d, resulting in a clean surface finish. The welded partition plates 3b, 3d are removed during the fifth step after the end of the second step.
Third step: Welding partition plates 3a and 3c are inserted into the grooves of the corners 4a and 4c.
Fourth step: Two welding robots are used to weld the corner sides 51b and 51f of the pair of opposing sides 5a and 5c, which are located at opposite corners, from the first layer to the n layers. The grooves between the upper and lower erection pieces 16a, 16d on the erection jigs 17a, 17d are welded by swinging the welding torch. This n-layer is a welded layer that can maintain temporary fixation even when the erection jigs 17a and 17d are removed.

Fifth step: With the erection jigs 17a and 17d removed, the corners 51b and 51f are welded to the finish layer. In this case, the groove between the erection pieces 17a and 17d is welded by inserting a welding torch. The welding torch can be inserted into the groove between the erection pieces 17a and 17d for welding, which makes the welding work easier and more efficient. At the corners 4a and 4c, the welding beads abut against the welding partition plates 3a and 3c, resulting in a clean surface finish.
Sixth step: removing the welding partition plates 3a and 3c, and removing the erection jigs 17b, 17c, 17e and 17f. Since the opposing sides 5a and 5c are welded, the upper and lower assembly BOX columns can be temporarily fixed even if the erection jigs 17b, 17c, 17e and 17f are removed.
Seventh step: The side 5b having the erection pieces 16b and 16c and the side 5d having the erection pieces 16e and 16f are welded at once by a welding robot. The side 5b has a corner side portion 51c, a side central portion 52b, and a corner side portion 51d by the erection pieces 16b and 16c. can be inserted and welded, so continuous welding is possible. Since the side 5d can also be welded in the same manner, the welding efficiency is improved.

The welding robot is taught before each welding.
Also, the welding robot moves using a traveling rail attached to the periphery of the assembly BOX column.
The erection piece is fused after welding is finished.

(Embodiment 4)
Embodiment 4 is shown in FIG.
In this embodiment, two erection pieces 18 are provided on each surface, and an erection jig 19 for temporary fixing is provided between the erection pieces of the upper and lower columns. Therefore, this assembly box column has eight erection pieces 18a, 18b, 18c, 18d, 18e, 18f, 18g, 18h and eight erection jigs 19a, 19b, 19c, 19d, 19e, 19f, 19g, 19h. , and the welding sides 5a, 5b, 5c, and 5d to be welded are each divided into two corner side portions and one side central portion.
In this embodiment, the central side portion is welded first, and after removing the erection jig, the welding partition plate is inserted into the groove of each corner to weld the corner side portion.
Specifically, welding proceeds in the following steps.
First step: Two welding robots are used to weld a central portion 52a between the erection jigs 19a and 19b and a central portion 52c between the erection jigs 19e and 19f. The grooves between the upper and lower erection pieces 18a, 18b, 18e, 18f of the erection jigs 19a, 19b, 19e, 19f are welded by swinging the welding torch. It should be noted that it is also possible to weld between the erection pieces at the time of welding the corner portions in a post-process without performing swing welding.

Second step: Weld the central side portion 52b and the central side portion 52d in the same manner as in the first step. That is, two welding robots are used to weld a central portion 52b between the erection jigs 19c and 19d and a central portion 52d between the erection jigs 19g and 19h. The grooves between the upper and lower erection pieces 18c, 18d, 18g and 18h of the erection jigs 19c, 19d, 19g and 19h are welded by swinging the welding torch. It should be noted that it is also possible to weld between the erection pieces at the time of welding the corner portions in a post-process without performing swing welding.
Third step: Welding partition plates 3a, 3b, 3c and 3d are inserted into grooves of four corners 4a, 4b, 4c and 4d.
Fourth step: Remove all eight erection jigs. Since four facing central side portions are welded, temporary fixation of the upper and lower assembly BOX columns is maintained. If temporary fixation cannot be maintained when all the erection jigs are removed due to circumstances at the construction site, the erection jigs 19d and 19h that do not affect the fifth step are left and the others are removed. The erection jigs 19d and 19h are removed after finishing the fifth step.

Fifth step: Two welding robots are used to weld the diagonal corners 51c and 51g of the pair of opposing sides 5b and 5d. At the corners 4a and 4c, the bead abuts against the welding partition plates 3a and 3c, resulting in a clean surface.
Sixth step: Two welding robots are used to weld the corner sides 51d and 51h of the pair of opposing sides 5b and 5d, which are positioned opposite to each other. At the corners 4b and 4d, the bead abuts against the welded partition plates 3b and 3d, resulting in a clean surface.
It should be noted that either of the corner portions may be formed in the fifth step and the sixth step. In addition, in the fifth and sixth steps, a welding torch can be inserted between the upper and lower erection pieces for welding, so swing welding is not necessary. Furthermore, as described above, it is possible to weld the erection pieces collectively in the fifth and sixth steps without welding the erection pieces in the second step.
Seventh step: two welding robots are used to weld the corner sides 51a and 51e of the pair of opposing sides 5a and 5c, which are positioned diagonally.
Eighth step: Two welding robots are used to weld the corner sides 51b and 51f of the pair of opposing sides 5a and 5c, which are positioned at opposite corners.

The welding robot is taught before each welding.
Also, the welding robot moves using a traveling rail attached to the periphery of the assembly BOX column.
The erection piece is fused after welding is finished.

(Embodiment 5)
Embodiment 5 is shown in FIG.
In this embodiment, two erection pieces 18 are provided on each surface in the same manner as the assembly BOX column shown in FIG. 7, and a erection jig 19 for temporary fixing is provided between the erection pieces of the upper and lower columns. Assembled BOX pillars are to be welded. Reference numerals written in FIG. 8 are the same as those in FIG. This assembly BOX column has a narrower interval between the erection pieces than the assembly BOX column shown in FIG. In this assembly box column, since the corner side is long, one diagonal corner side is welded first, and temporary fixing by welding is used to sequentially remove the assembly jigs, leaving the remaining welded side. Welding is performed through the central side portion and the corner side portion to improve the efficiency of welding.

Specifically, welding proceeds in the following steps.
First step: Welding partition plates 3a and 3c are inserted into grooves of corners 4a and 4c.
Second step: Welding the diagonally opposite corners 51b and 51f with two welding robots. The grooves between the upper and lower erection pieces 18b and 18f on the erection jigs 19b and 19f are welded by swinging the welding torch. At the corners 4a and 4c, the welding beads abut against the welding partition plates 3a and 3c, resulting in a clean surface finish.
Third step: The welding partition plates 3a and 3c are removed, and the corner side portions 51c and 51g are welded. Since the end faces are clean due to the weld beads in contact with the welding partition plates 3a and 3c, the corners can be smoothly welded by the welding robot.

Fourth step: Weld partition plates 3b and 3d are inserted into grooves of corners 4b and 4d, and erection jigs 19c, 19d, 19g and 19h are removed.
Fifth step: The central side portion 52b and the corner side portion 51d, which are the unwelded portions of the welding side 5b without the erection jigs 19c and 19d, are welded at once by a welding robot. A welding torch can be inserted through the gaps between the erection pieces 18c and 18d of the upper and lower columns for welding, so continuous welding can be performed. Similarly, the side central portion 52d and the corner side portion 51h of the welding side 5d, for which the erection jigs 19g and 19h have disappeared, are welded at once by another welding robot.
Sixth step: removing the welding partition plates 3b, 3d and removing the erection jigs 19a, 19b, 19e, 19f.
Seventh step: The central side portion 52a and the corner side portion 51a, which are the non-welded portions of the welding side 5a without the erection jigs 19a and 19b, are welded at once by a welding robot. Since the welding torch can be inserted through the gaps between the erection pieces 18a and 18b of the upper and lower columns for welding, continuous welding can be performed. Similarly, the side central portion 52c and the corner side portion 51e of the welding side 5c, for which the erection jigs 19e and 19f have disappeared, are welded at once by another welding robot.

The welding bead abuts against the welding partition plate at the groove of the corner and is finished neatly, so that the next welding can be easily performed by the robot. In this example, by first welding the corner side portions adjacent to the corner portion 4a and the diagonal corner portion 4c, the erection jigs are removed from the opposing welding sides 5b and 5d, and the remaining portions are continuously welded. robot welding becomes efficient For example, teaching can be performed once without dividing the central side portion 52b and the corner side portion 51d.
The welding robot is taught before each welding.
Also, the welding robot moves using a traveling rail attached to the periphery of the assembly BOX column.
The erection piece is fused after welding is finished.

(Embodiment 6)
Embodiment 6 is shown in FIG.
In this embodiment, two erection pieces 18 are provided on each surface in the same manner as the assembly BOX column shown in FIG. 8, and a erection jig 19 for temporary fixing is provided between the erection pieces of the upper and lower columns. Assembled BOX pillars are to be welded. Reference numerals written in FIG. 9 are the same as those in FIGS. In this example, the diagonal corners of the facing weld sides are welded, the erection jig for that weld edge is removed, the remaining unwelded portions of the facing weld edges are welded, and then the remaining erection In this method, the insertion jig is removed and welding is performed at once through the other facing welding edge.
In this welding method, the swing welding of the welding torch can be performed only once, and the welding robot can perform welding in three steps, thereby improving work efficiency.

Specifically, welding proceeds in the following steps.
First step: Welding partition plates 3a and 3c are inserted into grooves of corners 4a and 4c.
Second step: Welding the diagonally opposite corners 51b and 51f with two welding robots. The grooves between the upper and lower erection pieces 18b and 18f on the erection jigs 19b and 19f are welded by swinging the welding torch. At the corners 4a and 4c, the welding beads abut against the welding partition plates 3a and 3c, resulting in a clean surface finish. The welded partition plates 3a, 3c are then removed.
Third step: Welding partition plates 3b and 3d are inserted into grooves of corners 4b and 4d, and erection jigs 19a, 19b, 19e and 19f are removed.
Fourth step: The central side portion 52a and the corner side portion 51a, which are the portions of the welded side 5a that are not welded, where the erection jigs 19a and 19b are removed, are welded at once by a welding robot. Since the welding torch can be inserted through the gaps between the erection pieces 18a and 18b of the upper and lower columns for welding, continuous welding can be performed. Similarly, the side central portion 52c and the corner side portion 51e of the welding side 5c from which the erection jigs 19e and 19f have been removed are welded at once by another welding robot.

Fifth step: removing the welding partition plates 3b, 3d and removing the erection jigs 19c, 19d, 19g, 19h. Since the erection jigs 19c and 19d are eliminated and the previously formed welded ends of the corners 4a and 4b are neatly formed, the welding edge 5b can be welded all at once by a welding robot. can be done. At the same time, the welding sides 5d facing each other can also be welded at once by another welding robot.

The welding robot is taught before each welding.
Also, the welding robot moves using a traveling rail attached to the periphery of the assembly BOX column.
The erection piece is fused after welding is finished.

<Example of welded partition plate>
FIG. 10 shows an example of the welded partition plate 3. As shown in FIG. They are a perspective view (a), a top view (b), a right side view (c), and a rear view (d).
The welded partition plate 3 has a substantially right-angled triangular shape when viewed from the side, has a ridge line in the center of the upper surface, and has an upper right contact surface 31R and an upper left contact surface 31L formed on the left and right sides.
The contact surfaces provided on the left and right are the upper right contact, depending on whether the welding side on the left side is welded first or the welding side on the right side is welded first. The contact surface 31R and the upper left contact surface 31L can be selectively used.
Ceramic is suitable for the material in terms of high temperature resistance and releasability from the bead.
A photograph of the state of use is shown in FIG. In the example of FIG. 14, the welding edge 5 of the groove visible in the front is the part to be welded, and the welding partition plate 5 made of ceramic is installed with a displacement of several millimeters to the back side. This is because the welded partition plate 5 is removed after welding is completed, and the edge of the bead formed at the corner is polished. When the welded partition plate is installed in such a staggered manner, the welded partition plate is formed into a shape suitable for that position. The welded partition plate is formed depending on whether the weld beads formed at the corners are ground and formed first or left as they are.

<Example of welding robot>
FIG. 11 is a schematic diagram of the present welding robot. (a) is a basic configuration diagram, and (b) is a diagram with a monitoring device attached. Reference numerals are the same as those in FIG.
The upper and lower assembly BOX columns 1, 1 are overlapped, and the erection pieces 12, 12 provided respectively are connected by a erection jig 13 to temporarily fix the posture of the upper and lower square steel pipes. A groove 15 that serves as a welded portion is formed at the joint portion of the upper and lower rectangular steel pipes.
A rail 6 is attached to the square steel pipe 1 on the upper side, a traveling carriage 25 is connected to the rail 6, and the traveling carriage 25 and the welding torch 24 are connected with a base 26 to form the welding robot 2. Although the welding robot is provided with a power cable, a welding metal wire, etc., they are omitted from the illustration. Welding is performed with the tip of the torch positioned so as to face the groove 15 . As shown in Fig. 11(a), the presence of the upper and lower erection pieces limits the gap for inserting the torch, so if the torch is short, it will not reach the groove and the welding robot cannot be used, so it must be done manually. Become.
Since a power cable and the like are attached, the welding robot cannot go around the pillar and weld it. Instead, two welding robots placed facing each other or diagonally will reciprocate to overlap the welding passes. For steel frames in construction, the steel plates used are thick and require dozens of welding passes, resulting in multiple layers.

In the present invention, by developing a long torch, the welding torch reaches the groove from the gap of the erection piece.
In the conventional example, considering the gripping balance, the intermediate part of the length of the welding torch is connected to the base so as to be gripped, so the length to the tip of the torch is limited. is difficult to reach.
On the other hand, in the modified example of FIG. 11, the protruding length of the torch can be lengthened by connecting the rear end of the torch to the base.
The groove 15 provided by the upper and lower steel pipes shown in FIG. 11(a) may be a narrow groove of about 25 degrees, for example. In this way, when the opening angle is small and there is a gap between the upper and lower erection pieces 12, 12, the projecting length of the torch 24 is long in the present invention, so it is possible to accurately access the bevel through the gap between the erection pieces. . Although the first layer can be welded in one pass, the second and subsequent layers need to be divided into several steps to finish the entire layer because the groove widens. For example, the number of passes increases, such as 2 passes for 2 layers, 3 passes for 3 layers, and so on. It is also necessary to adjust the passing point of the tip of the torch.
When the torch is lengthened, the weight is reduced by using a lightweight material such as carbon fiber for the base of the torch in order to stabilize the posture of the tip of the torch. Further, by connecting the rear part of the torch to the base body, lengthening the tip side, and attaching an adjustment weight as a balancer to the rear end of the torch, the controllability of the torch is improved.
Furthermore, in FIG. 11(b), since the torch is equipped with a monitoring camera 27 that enables real observation of the welding state, the welding quality can be checked during welding.
It should be noted that it is important to control the base material temperature (temperature between passes) for quality control of welding. In the present invention, if an infrared thermography is adopted as the monitoring camera 27, the temperature of the pass (bead) can be directly controlled. Generally, the welding of the next pass is controlled so as not to occur until the temperature of the base material drops below 250°C to 350°C.

FIG. 12 shows the working state in which the welding robot is attached to the assembly BOX column.
FIG. 12 shows a welded portion where the lower assembly BOX column 1b and the upper assembly BOX column 1a are overlapped. It is temporarily fixed by erection jigs 19 to the erection pieces 12, 12 of the upper and lower assembly BOX pillars. Welded partition pieces 3 are inserted into the corners of the welded sides 5, 5 that serve as grooves. A welding robot is attached to a bar-shaped rail 61 . A bar-shaped rail 61 is attached to the side surface of the upper assembly BOX column with a magnet 62 .
The welding robot 2 has a traveling carriage 25 attached to the rail 61 and a body 26 attached below the traveling carriage 25 . A handle 23 and the like are also attached to the traveling carriage 25 . A welding torch 24 is attached to the body 26 . A welding material is continuously supplied to the welding torch 24 from a welding material supply tube 28 . A control wire 29 is connected to the traveling carriage 25 . A power cable can be attached to the control wire.
When moving the welding robot to another surface of the assembly BOX column, the magnet 62 can be attached to the other surface and the bar-shaped rail 61 can be replaced, so that the welding robot can be easily moved. By preparing a large number of magnets, it is not necessary to move the magnets, and the same applies to the rails 61 .

FIG. 13 shows an example in which a welding robot is attached to an assembly BOX column. Reference numerals are the same as those in FIG.
FIG. 13(a) shows erection pieces 12, 12 of the upper and lower assembly BOX columns, which are temporarily fixed by erection jigs 13 and attached to the assembly BOX column 1 so as to rotate around the rail 63, and further, the welding robot 2 is attached to the rail. It shows the installed state.
The rail is straight in the multifaceted range of the flat part of the assembly BOX column, and the corner part is curved. can be moved to
FIG. 13(b) shows a state in which the erection jig 13 is removed from the square steel pipe. As indicated in each embodiment, such a situation may occur if some or all of the plumbing fixtures can be removed and the pre-existing partial welds and remaining plumbing fixtures can maintain temporary fixation. are welded by welding robots.
FIG. 13(c) shows a state in which the erection piece is gas-cut and removed after the end of welding. A mark of the erection piece removed by fusion remains on the assembly BOX column 1. The circulation rail 63 and the welding robot 2 can be removed before the erection piece is fused.
Since gas cutting raises the temperature of the square steel pipe, it is necessary to leave a cooling period, but in the present invention, gas cutting can be performed after the welding process, so the welding time is not prolonged.

1 Assembly BOX pillar 1a Upper assembly BOX pillar 1b Lower assembly BOX pillar 11 Plane portions 12, 12a, 12b, 12c, 12d Erection pieces 13, 13a, 13b, 13c, 13d Erecting jig 14 Bolt 15 Bevel 16, 16a , 16b, 16c, 16d, 16e, 16f erection piece 17, 17a, 17b, 17c, 17d, 17e, 17f erection jig 18, 18a, 18b, 18c, 18d, 18e, 18f, 18g, 18h erection piece 19, 19a, 19b, 19c, 19d, 19e, 19f, 19g, 19h

2, 21, 22 Welding robot 23 Handle 24 Welding torch 25 Traveling cart 26 Body 27 Monitoring camera 28 Welding material supply tube 29 Control wire

3, 3a, 3b, 3c, 3d Welding partition plate 31 Upper contact surface 31R Upper right contact surface 31L Upper left contact surface

4, 4a, 4b, 4c, 4d corners

5, 5a, 5b, 5c, 5d Welding sides 51, 51a, 51b, 51c, 51d, 51e, 51f, 51g, 51h Corners 52, 52a, 52b, 52c, 52d Central side 53 Bead 54 Welding corner end face

6 rail 61 bar-shaped rail 62 magnet 63 circumference rail

Claims (7)

Upper and lower assembly BOX columns that are temporarily fixed by connecting the erection pieces with erection jigs using assembly BOX columns with erection pieces installed on the flat surface, and are temporarily fixed to each of the four corners. A method of welding upper and lower assembly BOX columns having eight corners existing between the points using a welding robot,
Insert the welded partition plate into the corner groove,
welding at least a pair of diagonal corners or a pair of opposing corners with a welding robot;
After welding of one corner side adjacent to each corner is completed, the inserted welding partition plate is removed and the other corner side is welded by a welding robot.
A method of welding an assembly BOX column with a welding robot, characterized by: 2. The method of welding assembly BOX columns with a welding robot according to claim 1, wherein the pair of diagonal corners are welded at intervals of 90 degrees. Upper and lower assembly BOX columns that are temporarily fixed by connecting the erection pieces with erection jigs using assembly BOX columns with erection pieces installed on the flat surface, and are temporarily fixed to each of the four corners. A method of welding upper and lower assembly BOX columns having eight corners existing between the points using a welding robot,
Insert the welded partition plate into the corner groove,
A pair of opposing sides are welded by a welding robot for each pair of diagonal corners,
Remove the inserted welded partition plate,
welding the other pair of opposing sides with a welding robot;
A method of welding an assembly BOX column with a welding robot, characterized by: An assembly BOX pillar in which a plurality of erection pieces are installed on one flat surface is used, and the erection pieces are connected by a erection jig to temporarily fix the upper and lower assembly BOX pillars. Using a welding robot, the upper and lower assembled BOX columns having eight corner side portions existing between the temporarily fixed points and the central side portions existing between the adjacent temporarily fixed points A method of welding, comprising:
Welding the opposing central parts using a welding robot,
Before welding the corners, insert the welding partition plate into the grooves of the four corners,
Weld the diagonal corners,
Remove the welding partition plate from the corner of the corner that has been welded, and weld the other corner that is in contact with the corner.
A method of welding an assembly BOX column with a welding robot, characterized by: Claims 1 to 3, characterized in that the erection jig that is no longer necessary for maintaining the temporary fixation of the upper and lower assembly BOX columns due to the partially completed welding is removed from the erection piece, and the welding robot continues welding. 5. A method of welding the assembly BOX column according to any one of 4 above with a welding robot. The method of welding assembled BOX columns with a welding robot according to any one of claims 1 to 5, wherein the welding partition plate is made of ceramic. By connecting the rear end side of the welding torch to the base of the welding robot, the welding robot lengthens the length from the base to the tip of the torch. 7. The method for welding assembly BOX columns with a welding robot according to any one of claims 1 to 6, wherein the joints of the BOX columns or the joints of the assembly BOX columns between the upper and lower erection pieces are welded.

Images