JP7569768B2 - Column welding method and welding machine installation device - Google Patents

Description

The present invention relates to a method for welding columns in which a lower column and an upper column are welded together using a welding machine, and a welding machine installation device for installing the welding machine.

Conventionally, when welding an upper column onto a lower column, it is known to use a welding machine for welding (see Patent Document 1).

Japanese Patent Application Publication No. 9-174237

When using a welding machine equipped with a welding robot and a guide rail for moving the welding robot horizontally to weld an upper column onto a lower column, in order to achieve accurate welding of the desired weld target, accurate horizontal movement of the welding robot must be maintained from the time the welding conditions are created (teaching) until the welding is completed.
In other words, in order to create welding conditions, it is necessary to install guide rails to guide the horizontal movement of the welding robot and to set reference coordinates for accurately operating the welding robot; therefore, a guide rail installation section is required that is configured to allow the guide rails of the welding machine to be installed horizontally so as not to move.
However, in the welding method disclosed in Patent Document 1, the installation section for horizontally installing the guide rail to guide the horizontal movement of the welding robot of the welding machine is composed of clamps arranged to clamp opposing sides of the pillar, so there is a possibility that the installation section composed of the clamps may move during welding, and there is a possibility that the welding robot may not be able to perform accurate welding work on the target welding object.
The present invention provides a welding method using a welding machine installation device that can form an installation section for installing the guide rails of a welding machine horizontally to prevent them from moving, and a welding machine installation device used for the method.

The column welding method according to the present invention is a column welding method in which an upper column is welded onto a lower column using a welding machine equipped with a guide rail and a welding robot configured to be movable horizontally on the guide rail, and a welding machine installation device equipped with an installation part for installing the guide rail is fixed to an erection piece provided on the side of the lower column. After that, a welding machine is installed on the installation part of the welding machine installation device fixed to the erection piece, and the welding machine is caused to weld to the welding target part, which is the butt part between the upper end of the lower column and the lower end of the upper column.
According to the column welding method of the present invention, an installation section can be constructed for installing the guide rail of the welding machine horizontally so as not to move, thereby enabling the welding machine to perform accurate welding work on the part to be welded, which is the butt joint between the upper end of the lower column and the lower end of the upper column.
In addition, the welding machine installation device according to the present invention used in the above-mentioned welding method is characterized in that it is provided with an attachment part for fixing to an erection piece provided on the side surface of the lower column, and an installation surface that becomes a horizontal plane when the attachment part is fixed to the erection piece.
The mounting portion is characterized in that it is provided with a first mounting portion for fixing to the erection piece provided on each side of the lower column, and a second mounting portion for fixing to the erection piece provided on each side of the lower column, two of which are provided.
According to the welding machine installation device of the present invention, the above-mentioned column welding method can be effectively realized.

1A is a perspective view showing a welding machine installation device, FIG. 1B is a view showing the welding machine installation device from the front side, and FIG. 1C is a view showing the welding machine installation device from the rear side (Embodiment 1). FIG. 1A is a diagram showing a state in which the welding machine installation device is fixed to the erection piece of the lower column via the first mounting part, and then the welding machine is installed on the installation surface of the welding machine installation device; FIG. 1B is a diagram showing a state in which the welding machine installation device is fixed to the erection piece of the lower column via the second mounting part, and then the welding machine is installed on the installation surface of the welding machine installation device (embodiment 1). FIG. 1 is a perspective view showing a state in which a welding machine installation device is fixed to an erection piece of a lower column via a first mounting portion (embodiment 1). A cross-sectional view (A-A cross-sectional view in FIG. 3) showing a state in which the welding machine installation device is fixed to the erection piece of the lower column via the first mounting part (Embodiment 1). FIG. 1 is a perspective view showing a state in which the welding machine installation device is fixed to the erection piece of the lower column via the second mounting portion (first embodiment). FIG. 1 is an enlarged perspective view showing a state in which the welding machine installation device is fixed to the erection piece of the lower column via the second mounting portion (Embodiment 1). FIG. 13 is a front view of the welding machine installation device fixed to the erection piece of the lower column via the second mounting portion (first embodiment). FIG. 11 is a perspective view showing a welding machine installation device (second embodiment).

EMBODIMENT 1
The column welding method according to embodiment 1 is a column welding method in which an upper column is welded onto a lower column to join them, and includes a welding machine installation device fixing step, a welding machine installation step, and a welding step.
In this specification, the directions of up, down, left, right, front and rear are defined as those shown in FIG.

The welding machine installation device fixing step is a step of fixing the welding machine installation device 1 shown in FIG. 1 to the erection piece 22 provided on the side surface 20S of the lower column 2 as shown in FIGS. 2, 3, and 5.
In addition, since the welding machine installation device 1 functions as a stand for installing the welding machine in the first embodiment, the welding machine installation device 1 will be referred to as the stand 1 hereinafter.
The welding machine installation step is a step of installing the welding machine 10 on the installation surface 1t of the stand 1 fixed to the erection piece 22, as shown in FIG. 2.
The welding step is a step of welding and joining the upper column 3 onto the lower column 2 by having a welding machine 10 installed on the installation surface 1t of the frame 1 weld the welding target portion S, which is the butt joint between the upper end of the lower column 2 and the lower end of the upper column 3, as shown in Figure 2.

In other words, the column welding method according to the first embodiment is a column welding method in which an upper column 3 is welded onto a lower column 2 using a welding machine 10 equipped with a guide rail 12 and a welding robot 11 configured to be movable horizontally on the guide rail 12, as shown in FIG. 2. The method includes fixing a stand 1 equipped with a horizontal installation surface 1t as an installation portion for installing the guide rail 12 to an erection piece 22 provided on a side surface 20S of the lower column 2, and then installing the welding machine 10 on the installation surface 1t of the stand 1 fixed to the erection piece 22, and having the welding machine 10 weld to the welding target portion S, which is the butt portion between the upper end of the lower column 2 and the lower end of the upper column 3.

The lower column 2 and the upper column 3 are, for example, steel columns called box columns.
As shown in FIG. 2 , the lower column 2 includes a column portion 20 and a top plate 21 provided at the upper end of the column portion 20 .
The upper pillar 3 comprises a pillar portion 30 and a backing metal 31 arranged to protrude downward from the lower end surface of the pillar portion 30.
The pillar portion 20 is formed into a hollow pillar shape with a square cross section by joining four skin plates that form the side surfaces 20S, 20S . . . by welding.
Similarly, the column portion 30 is formed into a hollow columnar shape with a square cross section by joining four skin plates that form the side surfaces 30S, 30S . . . by welding.
The top plate 21 is formed, for example, from a rectangular flat plate that is slightly larger than the diameter of the column portion 20, and is arranged so that the outer periphery of the top plate 21 protrudes outward from the outer periphery surface (side surface 20S) of the column portion 20.
The backing metal 31 is formed by a flat plate that protrudes downward from the lower end surface of each skin plate that constitutes each side surface 30S, 30S ... of the column portion 30. Each backing metal 31, 31 ... is joined by welding to the inner surface of the lower end side of each skin plate that constitutes the column portion 30. In addition, each flat plate constitutes a hollow backing metal tubular body with a square cross section that forms an outer peripheral surface that contacts the inner peripheral surface of the column portion 30, and the outer peripheral surface of the backing metal tubular body that protrudes downward from the lower end of the column portion 30 becomes the outer surface of each backing metal 31, 31 .... In addition, the lower end surface of each skin plate that forms each side surface 30S, 30S ... of the column portion 30 is formed on the groove surface 32. In addition, the lower end surface of each backing metal 31, 31 ... that protrudes downward from the lower end of the column portion 30 is configured to be positioned on the same plane perpendicular to the center line of the column portion 30.

In addition, an erection piece is provided on the upper end side of the side surfaces 20S, 20S... of the column portion 20 of the lower column 2 and the lower end side of the side surfaces 30S, 30S... of the column portion 30 of the upper column 3 to temporarily fix the upper and lower columns 2, 3 in a vertical state when welding and joining the upper column 3 onto the lower column 2.
In addition, in each of FIGS. 2, 3, 5, and 7, only the erection piece 22 provided on the side surface 20S of the column portion 20 of the lower column 2 to which the stand 1 is fixed is shown, and the illustration of the other erection pieces is omitted.

That is, the lower end surfaces of the backing metals 31, 31... which form the lower end of the upper column 3 are butted against the upper surface of the top plate 21 which forms the upper end of the lower column 2, and the side surfaces 20S, 20S... of the lower column 2 and the side surfaces 30S, 30S... of the upper column 3 are positioned on the same plane. In this state, the lower column 2 and the upper column 3 are temporarily fixed to each other using an erection piece. Then, welding work is performed using a welding machine 10 on the welding target portion S, which is the butt portion between the upper end of the lower column 2 and the lower end of the upper column 3.
In the column welding method according to the first embodiment, first, when welding the welding target portion S, which is the butt portion between the upper surface of the top plate 21 located above one side surface 20S of the lower column 2 and the lower end surface of the backing metal 31 located below one side surface 30S of the upper column 3, the erection piece not shown provided on the side surfaces 20S, 20S ... other than the one side surface 20S of the lower column 2 and the erection piece not shown provided on the side surfaces 30S, 30S other than the one side surface 30S of the upper column 3 are fixed in a combined state using a combining means, and then the upper and lower columns 2, 3 are temporarily fixed in a vertical state, as shown in FIG. 3 and FIG. 5, the stand 1 is fixed to the erection piece 22 provided on one side surface 20S of the lower column 2.
In addition, as a connecting means for connecting the erection piece of the lower column 2 and the erection piece of the upper column 3, for example, a connecting means such as a plate and bolt not shown in the figure or a dedicated erection device may be used.

As shown in FIG. 1, the stand 1 is configured with a main body 5 and a mounting portion for mounting to an erection piece 22 provided on the side surface 20S of the lower pillar 2.

The main body 5 is configured, for example, by butting the edges of the upper and lower flanges 51, 52 of one H-shaped steel 50A with the edges of the upper and lower flanges 51, 52 of the other H-shaped steel 50B, joining the edge of the upper flange 51 of one H-shaped steel 50A to the edge of the upper flange 51 of the other H-shaped steel 50B by welding, and joining the edge of the lower flange 52 of one H-shaped steel 50A to the edge of the lower flange 52 of the other H-shaped steel 50B by welding, thereby forming a tubular portion 55 with a rectangular cross-section surrounded by the upper flange 51, web 53, and lower flange 52 of one H-shaped steel 50A and the upper flange 51, web 53, and lower flange 52 of the other H-shaped steel 50B.
At least one of the outer plate surfaces of the upper flange 51 of one H-shaped steel 50A and the upper flange 51 of the other H-shaped steel 50B that are butted against each other, or the outer plate surfaces of the lower flange 52 of one H-shaped steel 50A and the lower flange 52 of the other H-shaped steel 50B that are butted against each other, is formed on the installation surface 1t.
Furthermore, the installation surface 1t is composed of a smooth surface formed by grinding the already welded portion at the boundary between the edge of the outer plate surface of the flange of one H-shaped steel 50A and the edge of the outer plate surface of the flange of the other H-shaped steel 50B using a grinding machine such as a grinder.

The mounting portion is configured to include a first mounting portion 6 for mounting to the erection pieces provided on each side surface 20S, 20S... of the lower column 2, and a second mounting portion 7 for mounting to the erection pieces provided on each side surface 20S, 20S... of the lower column 2, two of which are provided.

The first mounting portion 6 is composed of, for example, a screw hole 62 formed to penetrate the web 53 at one end side in the extension direction of one H-shaped steel 50A (front side in Figure 1) and each of the support plates 61, 61... welded with their plate surfaces in contact with both plate surfaces of the web 53, and a screw hole 62 formed to penetrate the web 53 at one end side in the extension direction of the other H-shaped steel 50B (front side in Figure 1) and each of the support plates 61, 61... welded with their plate surfaces in contact with both plate surfaces of the web 53.
The number of screw holes 62 provided in the H-shaped steel 50A, 50B may be one or more. For example, as shown in Fig. 1, one screw hole 62 may be provided on each of the upper and lower sides of the web 53 at a predetermined interval in the vertical direction of the web 53.

The second mounting portion 7 is composed, for example, of a channel steel 70 attached by welding to the plate surface (plate surface located on the outside of the tubular portion 55) of the web 53 at the other end side in the extension direction of one H-shaped steel 50A (rear side in Figure 1), and a channel steel 70 attached by welding to the plate surface (plate surface located on the outside of the tubular portion 55) of the web 53 at the other end side in the extension direction of the other H-shaped steel 50B (rear side in Figure 1).
In other words, the channel steel 70 is welded with the plate surface of one flange 72 in contact with the plate surface (the plate surface located on the outside of the tubular portion 55) of the web 53 of one H-shaped steel 50A or the other H-shaped steel 50B, and joined to one H-shaped steel 50A or the other H-shaped steel 50B, so that the plate surface of the web 71 extends in the up-down vertical direction and the left-right horizontal direction, and the plate surface of the other flange 73 extends in the up-down vertical direction and the front-to-back horizontal direction.
The second mounting portion 7 is formed by the other flanges 73, 73 of the channel steels 70, 70 joined to the webs 53 of one H-shaped steel 50A and the other H-shaped steel 50B.

The welding machine 10 includes a welding robot 11 and a guide rail 12, and the welding robot 11 is configured to be movable horizontally on the guide rail 12.

When one erection piece is provided on the center of the width direction of each side surface 20S, 20S... of the lower column 2, in the mounting fixing step, as shown in Figs. 2(a), 3, and 4, the first mounting portion 6 of the mounting base 1 is fixed to the erection piece 22 using a bolt 65 as a first fixing means, so that the mounting base 1 is firmly fixed to the erection piece 22 so that the mounting base 1 does not move. Therefore, the installation surface 1t of the mounting base 1 becomes a horizontal installation surface as a stationary installation portion for installing the guide rail 12 of the welding machine 10 horizontally so as not to move, and the guide rail 12 of the welding machine 10 can be installed horizontally on the horizontal installation surface 1t of the mounting base 1 so as not to move.

When two erection pieces are provided at a predetermined interval along the width direction of the side surface 20S of the column 2 on each side surface 20S, 20S..., in the fixing step, as shown in Figs. 2(b), 5, 6, and 7, the second mounting portion 7 of the frame 1 is fixed to the erection piece 22 using, for example, a vice 75 as a second fixing means, so that the frame 1 is firmly fixed to the erection piece 22 so that the frame 1 does not move. Therefore, the installation surface 1t of the frame 1 becomes a horizontal installation surface as a stationary installation portion for installing the guide rail 12 of the welding machine 10 horizontally so as not to move, and the guide rail 12 of the welding machine 10 can be installed horizontally on the horizontal installation surface 1t of the frame 1 so as not to move.

As shown in Figures 2, 3, and 5, the frame 1 is installed on a reference surface 98, such as the floor surface or the top surface of a beam at a steel frame construction site, via a height adjustment member 99. For example, the height adjustment member 99 is used to adjust the installation surface 1t of the frame 1 so that it is positioned on a horizontal plane close to the top surface of the top plate 21, which is located above one side surface 20S of the lower column 2.

For example, after the stand 1 is installed on the reference surface 98 so that one erection piece 22 provided on the side surface 20S of the lower column 2 is positioned inside the cylindrical part 55 of the stand 1 through the front opening of the cylindrical part 55, as shown in FIG. 4, a bolt 65 as a first fixing means is screwed into the screw hole 62 as the first mounting part 6 provided on the H-shaped steel 50A, 50B, and both plate surfaces of the erection piece 22 are clamped by the tips 65t, 65t of the bolts 65, 65 on both the left and right sides, thereby fixing the stand 1 to the erection piece 22.

In addition, for example, the plate surfaces of the two erection pieces 22, 22 provided on the side surface 20S of the lower column 2 and the outer plate surface of the other flange 73, 73 of the channel steel 70, 70 as the second mounting portion 7 provided on the H-shaped steel 50A, 50B are spaced apart or in contact with each other, and the stand 1 is installed so as to face each other.
Thereafter, as shown in FIGS. 5, 6, and 7, the other flange 73 of the right channel steel 70 provided on the right H-shaped steel 50A and the right erection piece 22 are clamped using a vice 75 as a second fixing means, and similarly, the other flange 73 of the left channel steel 70 provided on the left H-shaped steel 50B and the left erection piece 22 are clamped using a vice 75 as a second fixing means, thereby fixing the frame 1 to the left and right erection pieces 22, 22.
In reality, since the dimensions of H-shaped steel and channel steel are standardized, it is difficult to match the dimension of the spacing W1 between the opposing plate surfaces of the left and right erection pieces 22, 22 and the dimension of the spacing W2 between the outer plate surfaces of the other flanges 73, 73 of the left and right channel steels 70, 70, and to bring the plate surfaces of the left and right erection pieces 22, 22 into contact with the outer plate surfaces of the other flanges 73, 73 of the left and right channel steels 70, 70.
Therefore, the dimension of the above-mentioned interval W2 is made smaller than the dimension of the interval W1, and a gap (space) is provided between the outer plate surface of the other flange 73 of the channel steel 70 and the plate surface of the erection piece 22, and the other flange 73 of the channel steel 70 and the erection piece 22 are clamped with a vice 75. Even in this way, the erection piece 22 and the other flange 73 of the channel steel 70 are fixed on the left and right sides with the vice 75, so the base 1 fixed in this way does not move in the left and right direction.
Furthermore, if the above-mentioned dimensions of the interval W2 and the interval W1 can be matched, it is of course possible to clamp the two together using the vice 75 after bringing the outer plate surfaces of the other flanges 73, 73 of the left and right channel steels 70, 70 into contact with the plate surfaces of the left and right erection pieces 22, 22.

Next, in the welding machine installation step, the guide rail 12 is installed so as to extend horizontally on the horizontal installation surface 1t of the stand 1 fixed to the erection piece 22, and the welding robot 11 is installed so as to be movable horizontally on the guide rail 12. In other words, the guide rail 12 is installed in a fixed state on the installation surface 1t of the stand 1 so as to be able to create (teaching) welding conditions, and the welding robot 11 is attached to the guide rail 12 so as to be movable on the guide rail 12.

Then, in the welding step, the welding machine 10 installed on the installation surface 1t of the frame 1 welds to the welding target portion S, which is the butt joint between the upper end of the lower column 2 and the lower end of the upper column 3, thereby welding and joining the upper column 3 onto the lower column 2.
That is, as shown in FIG. 2, a welding torch 11t of a welding robot 11 moves along a portion to be welded S, whereby welding is performed on the portion to be welded S.
In this case, each time welding to the welding target portion S on one side surface 20S, 30S of the lower column 2 and the upper column 3 is completed, the stand 1 is removed from the erection piece, and the stand 1 is fixed to the erection piece provided on the other side surface 20S of the lower column 2.
In other words, in embodiment 1, the stand 1 is sequentially reattached to the erection pieces provided on each side surface 20S, and the welding target portions S on each of the four side surfaces 20S, 30S of the lower column 2 and the upper column 3 are welded in sequence.
After all the welding work is completed and the upper column 3 is welded onto the lower column 2, the erection pieces provided on one side surface 20S, 30S of the lower column 2 and the upper column 3 are cut and removed.

According to the column welding method of embodiment 1, the erection piece provided on the side surface 20S of the lower column 2 is used, and the frame 1 is firmly fixed to the erection piece by the first mounting portion 6 or the second mounting portion 7. As a result, a horizontal installation surface 1t for installing the guide rail 12 of the welding machine 10 horizontally so as not to move can be configured as an installation portion.
Therefore, by installing a guide rail 12 on the installation surface 1t of the stand 1 and assembling a welding robot 11 on the guide rail 12 and creating (teaching) welding conditions for the welding robot 11, the welding robot 11 can perform accurate welding work on the welding target part S, which is the butt joint between the upper end of the lower column 2 and the lower end of the upper column 3.

EMBODIMENT 2
The mount may be a mount 1X as shown in FIG.
The stand 1X includes a main body 5A and an attachment portion for attaching to an erection piece 22 provided on a side surface 20S of the lower column 2.

The main body 5 is formed, for example, from an H-shaped steel 50 .
The mounting portion is configured to include a first mounting portion 6 and a second mounting portion 7, similar to the pedestal 1 described in the first embodiment.
In the rack 1X, the first mounting portion 6 is configured by, for example, a bolt through hole 66 formed in the web 53 at one end side in the extension direction of the H-shaped steel 50 (the front side in FIG. 8).
In addition, in the rack 1X, the second mounting portion 7 is composed of, for example, channel steels 70A, 70A attached by welding to both plate surfaces of the web 53 at the other end side in the extension direction of the H-shaped steel 50 (rear side in Figure 8).
In other words, the channel steel 70A is welded with the plate surface of one flange 72 in contact with the plate surface of the web 53 of the H-shaped steel 50, and joined to the H-shaped steel 50, so that the plate surface of the web 71 extends in the up-down vertical direction and the left-right horizontal direction, and the plate surface of the other flange 73 extends in the up-down vertical direction and the front-to-back horizontal direction.
The second mounting portion 7 is formed by bolt through holes 76 formed in the other flanges 73, 73 of the channel steel 70A, 70A joined to both plate surfaces of the web 53 of the H-shaped steel 50.
In addition, the bolt through hole 66 as the first mounting portion 6 provided in the H-shaped steel 50 and the bolt through hole 76 as the second mounting portion 7 provided in the other flange 73 of the channel steel 70A are provided at positions corresponding to the bolt through hole 25 (see FIG. 2) formed in the erection piece 22.

In the second embodiment, when an erection piece is provided on each side surface 20S, 20S ... of the lower column 2, one erection piece is provided on the center side of the width direction of the side surface 20S, for example, on a reference surface 98 such as the floor surface or the upper surface of a beam at a steel frame construction site via a height adjustment member 99, and then a bolt not shown is inserted through the bolt through hole 66 as the first mounting portion 6 of the frame 1X and the bolt through hole 25 formed in the erection piece 22. Then, a nut not shown is fastened to the tip of the bolt, thereby fixing the web 53 of the frame 1X to the erection piece 22.
In addition, in the case where two erection pieces are provided at a predetermined interval along the width direction of the side surface 20S on each side surface 20S, 20S ... of the lower column 2, the frame 1X is installed on a reference surface 98 such as the floor surface or the upper surface of a beam at a steel frame construction site via a height adjustment member 99, and then a bolt not shown is inserted into the bolt through hole 76 as the second mounting portion 7 of the frame 1X and the bolt through hole 25 formed in the erection piece 22, and then a nut not shown is fastened to the tip of the bolt, thereby fixing the flanges 73, 73 of the channel steel 70A, 70A of the frame 1X to the corresponding erection piece 22.
As a result, the installation surface 1t of the stand 1X becomes a horizontal installation surface for installing the guide rail 12 of the welding machine 10 horizontally so as not to move, and the guide rail 12 of the welding machine 10 can be installed horizontally on the horizontal installation surface 1t of the stand 1X so as not to move.
Therefore, similarly to embodiment 1, a guide rail 12 is installed on the installation surface 1t of the stand 1X, and a welding robot 11 is attached to the guide rail 12. Then, welding conditions are created (teached) for the welding robot 11, so that the welding robot 11 can perform accurate welding work on the welding target portion S, which is the butt joint between the upper end of the lower column 2 and the lower end of the upper column 3.

In the second embodiment, as in the first embodiment, the stand 1 is installed so that the outer plate surfaces of the other flanges 73, 73 of the left and right channel steels 70A, 70A and the plate surfaces of the two left and right erection pieces 22, 22 provided on the side surface 20S of the lower column 2 are spaced apart or in contact with each other and face each other, and then the other flange 73 of the right channel steel 70A and the right erection piece 22 are clamped using a vice 75 as a fixing means, and the other flange 73 of the left channel steel 70 and the left erection piece 22 are clamped using a vice 75 as a fixing means, so that the stand 1 is fixed to the left and right erection pieces 22, 22.

The column welding method according to the present invention can be used, for example, when welding a lower column to an upper column in the following steel frame structure construction method developed by the present applicant.
That is, in a steel structure construction method in which a steel structure is configured to be laterally movable at a start point of movement at a planned construction site, the steel structure configured to be laterally movable is moved laterally to an end point of movement at the planned construction site and then fixed to a column foundation at the end point of movement, a steel structure is configured to be movable by providing upper columns 3, 3... at the start point of movement and assembling beams between adjacent upper columns 3, 3, the movable steel structure is moved laterally from the start point of movement to the end point of movement, and at the end point of movement, the upper columns 3, 3... of the steel structure that has been moved laterally are welded and joined to the lower columns 2, 2... fixed to the column foundation, thereby constructing a steel structure fixed to the column foundation at the end point of movement, and the above-mentioned welding method can be used as a welding method for joining the corresponding upper and lower columns 2, 3 by welding.
In this case, the frame 1 may be installed on the foundation concrete floor as the reference surface 98 .

The column welding method according to the present invention can also be used to join the lower column and the upper column in a typical steel frame building by welding. In this case, for example, if the lower column has a length equivalent to the height of two floors, the frame 1 can be installed on the beam or floor of the third floor as the reference surface 98.

In addition, the columns to be welded in the present invention may be columns other than the box columns described above. That is, as long as an erection piece is attached to the column, it may be, for example, a steel pipe column such as a square steel pipe column or a circular steel pipe column other than a box column, or a steel frame column such as an H-shaped steel. When a circular steel pipe column is to be welded, a guide rail that extends along the outer periphery of the circular steel pipe column may be used.

In addition, in the column welding method described in the embodiment, an example was shown in which a stand was used as a welding machine installation device having an installation surface 1t as an installation part formed by a horizontal plane, but in the column welding method of the present invention, it is sufficient to use a welding machine installation device equipped with an installation part for installing the guide rail of the welding machine horizontally so that it does not move, and it is not necessarily necessary to use a welding machine installation device having an installation surface formed by a horizontal plane.
For example, a welding machine installation device having an installation portion that is not on a horizontal surface may be used, and a mounting member of some kind may be used to install the guide rail of the welding machine horizontally so as not to move.
That is, in the column welding method according to the present invention, a welding machine installation device is used that is fixed to the erection piece so as not to move, and has an installation part that can install the guide rail of the welding machine horizontally so as not to move.

It is also possible to perform welding using the welding machine installation device (frame) of the present invention at a factory or other location, rather than at a construction site. That is, it is possible to install the welding machine installation device on the factory floor as the reference surface 98, and weld the upper column onto the lower column.

Furthermore, the welding machine installation device does not necessarily have to be installed on the reference surface 98 .
That is, in the column welding method according to the present invention, for example, the welding machine installation device may be fixed to the erection piece and used in a suspended state.

1 Stand (welding machine installation device), 1t Installation surface (installation part), 2 Lower pillar,
3 Upper column, 6 First mounting part, 7 Second mounting part, 10 Welding machine,
11 welding robot, 12 guide rail, 20S side surface of lower column,
22 Erection piece, S Welding target part.

Claims (3)

A method for welding columns, in which an upper column is welded onto a lower column, using a welding machine including a guide rail and a welding robot configured to be horizontally movable on the guide rail, comprising:
A method for welding columns, comprising the steps of: fixing a welding machine installation device having an installation part for installing a guide rail to an erection piece provided on the side of a lower column; installing a welding machine on the installation part of the welding machine installation device fixed to the erection piece; and having the welding machine perform welding on a welding target part, which is a butt joint between the upper end of the lower column and the lower end of the upper column. A welding machine installation device used in the welding method according to claim 1,
A welding machine installation device characterized by having an attachment part for fixing to an erection piece provided on the side surface of a lower column, and an installation surface that becomes a horizontal plane when the attachment part is fixed to the erection piece. The welding machine installation device according to claim 2, characterized in that the mounting parts include a first mounting part for fixing to an erection piece provided on each side of the lower column, one on each side, and a second mounting part for fixing to an erection piece provided on each side of the lower column, two on each side.

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