JP3292794B2 - How to attach a diaphragm in a square steel pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for mounting a diaphragm in a rectangular steel pipe used for mounting a diaphragm on a side of a column, for example, when connecting columns of a steel structure with beams. .

[0002]

2. Description of the Related Art Conventionally, a diaphragm is attached to a support column by, for example, a method shown in FIG. That is, the columns are the lower column 90, the column 91 and the upper column.
It is cut (divided) into 92. A lower diaphragm 94 is welded to the upper end of the lower support 90 via a backing material 93, and a backing material 95 is placed on the lower diaphragm 94.
The lower end of the column 91 is welded through. Column 91
The upper diaphragm 97 is welded to the upper end of the upper diaphragm 97 via a backing material 96, and the lower end of the upper support 92 is welded to the upper diaphragm 97 via a backing material 98.

[0003] The connection of the beam 99 to the column formed in this way is performed by connecting the free end of the beam 99 to both diaphragms 9.
It was done by welding to 4, 97 and column 91. And, both diaphragms 94 and 97 served to transmit the stress.

[0004]

However, according to the above-mentioned conventional structure, the diaphragms 94 and 97 are attached after the support pillar, that is, the square steel pipe is divided into a plurality of sections.
A great deal of time and expense is required for the dividing operation, and there are problems such as many welding points.

[0005] Therefore, the invention according to claim 1 of the present invention provides a method of attaching a diaphragm to a rectangular steel pipe which can attach a diaphragm to a desired position in the rectangular steel pipe without cutting the rectangular steel pipe. It is intended.

[0006]

In order to achieve the above-mentioned object, according to the present invention, a method for mounting a diaphragm in a rectangular steel pipe according to claim 1 is provided in a rectangular steel pipe supported laterally by a supporting device. At the predetermined position where the diaphragm of the square steel pipe is to be attached, the holes are formed at the ends of the pair of flat plate portions forming the respective corners in the thickness direction in order to supply the diaphragm by the material-to-be-welded supply device and perform the welding connection. formed; then, the welding material supply device includes a insertion movement freely Ude杆for in square tube, the distal end side of the Ude杆a support and supported releasable diaphragm support apparatus diaphragm, front and rear backing material was disposed a backing material supporting device configured to freely toward and away from moving the support and the support releasable a and the support member relative to the arm杆中heart via a respective supporting member, the diaphragm support device To support the diaphragm,
Before and after this diaphragm, a backing material provided with a backing material on a surface facing the steel pipe inner surface and the diaphragm surface is supported by a support member of a backing material support device , and
With the arm and rod moved closer to the center side of the arm via the support member, the diaphragm and the backing material are first inserted to a predetermined position in the rectangular steel pipe by the insertion movement of the arm rod, and then the support member of the backing material support device The backing material is moved away from the center of the arm rod through the backing material to make contact with the corner formed by the inner surface of the rectangular steel pipe and the diaphragm surface via the backing material, and the rectangular steel pipe is passed through the hole formed in the rectangular steel pipe. Weld the diaphragm and the backing material before and after, then release the support of the diaphragm by the diaphragm support device and release the support of the backing material by the support member of the backing material support device. After the support member of the support device is moved to the center of the arm rod, the arm rod is pulled out.

Therefore, according to the first aspect of the present invention, the diaphragm is supported by the diaphragm supporting device on the tip end side of the arm rod, and before and after the diaphragm,
In a state in which the backing material is supported by the backing material support device and moved toward the center of the arm rod, this arm rod is inserted into the rectangular steel pipe supported sideways by the support device, thereby allowing the inside of the rectangular steel pipe to be inserted. The diaphragm can be inserted at a desired position.

Next, the backing material is moved away from the center of the arm rod and brought into contact with the corner formed by the inner surface of the rectangular steel pipe and the diaphragm surface. Welding with materials can be performed. that time
Backing material at the corners and backing material
High quality with good airtightness and no leakage of molten metal
Can be welded. After that, the support of the diaphragm and the support of the backing material are released, and the backing material support device is moved to the center of the arm rod, and then the arm rod is pulled out to move it to a desired position in the rectangular steel pipe. Can be attached to the diaphragm.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below.
The state adopted for a square rectangular steel pipe will be described with reference to FIGS.

As shown in FIGS. 1 and 5, a square rectangular steel pipe 1 has a seam welded portion 2 formed on one side of a flat plate portion 1A forming four sides, and each square portion 1B has
Holes 3 are formed (pierced) in the thickness direction at the ends of the pair of flat plates 1A forming the corners 1B. These holes 3 are formed corresponding to predetermined positions where a diaphragm (described later) is to be attached . Such your RHS 1
May be a seamless steel pipe.

As shown in FIG. 2, a support device 10 for supporting and rotating the rectangular steel pipe 1 in a horizontal direction is provided at the installation work site. That is, the support device 10 is configured by a pair (single or plural) of the drive support portions 11 and the floating support portions 12 provided at one (or a plurality of) positions between the drive support portions 11. You.

Each of the supporting portions 11 and 12 is provided with a lower frame 13 and
The frame 13 includes a plurality of small-diameter gears 14, a large-diameter gear 15 meshed and mounted between the small-diameter gears 14, and the like. A driving device (motor or the like) 16 provided on the 13 side is linked. The large-diameter gear 15 has a ring shape, and its internal hole is formed as a rectangular hole 17 through which the square steel pipe 1 can be inserted. In the floating support portion 12, the small-diameter gear
The roller 14 may be replaced with the large-diameter gear 15 and the ring-shaped rotating body may be replaced.

The rectangular steel pipe 1 is inserted into the large-diameter gear group 15 by moving the rectangular steel pipe 1 in the axial direction of the pipe at this installation work site, or by inserting the rectangular steel pipe 1 at another place. The large-diameter gears 15 are externally fitted, and the square steel pipe 1 is transported by a crane, a forklift, or the like, and the large-diameter gears 15 are mounted on the small-diameter gears 14 of the support portions 11 and 12 while meshing with each other. It is done in.

As shown in FIGS. 2 and 5, the welding site is equipped with a welding machine 20 and a backing device 24. That is, the welding machine 20 is an electroslag welding machine, an electrogas arc welding machine, or the like. The welding wire 21 is configured to be insertable from above into the upper hole 3 of the square steel pipe 1 from above. The ground 22 is configured to be freely connectable to a remote position.

The backing device 24 includes a frame 25,
Upward cylinder 26 provided on this frame 25
And a piston rod 27 fitted inside the cylinder 26 so as to be able to move up and down, and a backing material (asbestos or asbestos) which is integrated with the upper end of the piston rod 27 and can be inserted into the lower hole 3 of the square steel pipe 1 from below. And a spring (elastic body) 29 for urging the backing material 28 in the insertion direction. Backing device
24 is configured such that its installation position can be changed freely.

In the mounting work site, the supporting device
A welding material supply device 30 for supplying the diaphragm 5 and the like is provided in the rectangular steel pipe 1 supported laterally by 10. That is, the welding material supply device 30 is provided with an arm rod 31 that can be inserted into and removed from the rectangular steel pipe 1. This arm rod 31
Is cylindrical, and its base end portion is supported on the bogie 35 side via a plurality of bearings 32, and is thus configured to be rotatable around the arm rod center 33.

The bogie 35 is mounted on a floor-side rail 36 along the arm rod center 33 and along the longitudinal direction of the rectangular steel pipe 1 via wheels 37. The arm 31 is inserted and withdrawn. The carriage 35 is provided with a traveling drive unit 38 for performing reciprocating traveling and a rotation driving unit 39 for rotating the arm 31. Here, the traveling drive device 38 and the rotation drive device 39 employ a motor, a gear transmission mechanism, or the like.

A guide device 40 for supporting and guiding the arm rod 31 is provided outside the end of the floor rail 36 and on the support device 10 side.
The guide device 40 includes a holding frame 41, a plurality of receiving rollers 42, and the like. A plurality of guided devices 45 guided on the inner surface 1a of the rectangular steel pipe 1 are provided at a plurality of outer locations on the distal end side of the arm rod 31, and the guided devices 45
It is composed of a bracket 46 fixed to the outside of the arm rod 31, a plurality of guide rollers 47 and the like.

A diaphragm support device 50 is provided at the distal end of the arm rod 31 so as to support and release the diaphragm 5 by operation from the base end side of the arm rod 31. Here, the diaphragm 5 has a rectangular plate shape, and is formed in such a size that a small gap S is formed between the diaphragm 5 and the inner surface 1 a of the four sides of the rectangular steel pipe 1. A through hole 6 having an inner diameter smaller than the outer diameter of the arm rod 31 is formed in the center.

As shown in FIGS. 1 and 3 to 5, the arm rod
A small-diameter cylindrical portion 51 is integrated with the tip of the 31, so that a step 52 is formed between the arm rod 31 and the small-diameter cylindrical portion 51. Here, the outer diameter of the small-diameter cylindrical portion 51 is set smaller than the inner diameter of the through hole 6. Therefore, the diaphragm 5 can be fitted to the small-diameter cylindrical portion 51 through the through hole 6, and one of the pair of diaphragm surfaces 5 a and 5 b, that is, the diaphragm surface 5 a on the side of the bogie 35 abuts on the step 52. Is done.

An intermediate cylinder 53 is fitted inside the arm rod 31, and a cam body 54 is fixed to a plurality of (or all around) the distal end of the intermediate cylinder 53 in the circumferential direction. Is formed on a cam surface 54a which is inclined so as to be more distant from the arm rod center 33 toward the distal end. A plurality of holders 55 having a cam surface 55a to be brought into contact with the cam surface 54a are provided,
These holders 55 are configured to be fitted into guide holes 56 formed in the small-diameter cylindrical portion 51 and to move closer to and away from the arm-bar center 33.

A box-shaped case body 34 is fixed to the base end of the arm rod 31, and the base end of the intermediate cylindrical body 53 extends into the case body 34. An intermediate bracket 57 is fixed to the base end of the intermediate cylinder 53, and the intermediate bracket 57 and the case
Cylinders 58 for the support device for pushing and pulling the intermediate cylinder 53 along the arm rod center 33 are provided at a plurality of positions around the arm rod center 33.

Here, when the intermediate cylinder 53 is pulled toward the base end by the support device cylinder device 58, the cam surface 54a
The holding member 55 group is moved away from the arm rod center 33 by the and the cam surface 55a, and pressed against the inner surface of the through hole 6 of the diaphragm 5, whereby the diaphragm 5 is held. Further, when the intermediate cylinder 53 is pushed and moved to the distal end side by the support device cylinder device 58, the holding body 55 group is moved closer to the arm rod center 33 by the cam surface 54a and the cam surface 55a, and the diaphragm is moved. 5 is loosely fitted in the through hole 6, thereby releasing the holding of the diaphragm 5. The diaphragm supporting device 50 is constituted by the above 51 to 58.

A pair of front and rear backing members 8 and 9 can be freely supported and released from the distal end side of the arm rod 31 by operating from the base end side of the arm rod 31, and can be approached or separated from the center 33 of the arm rod. Movable backing material support devices 60, 70 are provided. The backing members 8 and 9 are formed of rods having a rectangular cross section, and are arranged in a divided frame shape so as to face the respective inner surfaces 1 a of the rectangular steel pipe 1. It is configured to be supported by. One backing material 8 corresponds to one diaphragm surface 5a, and the other backing material 70
Corresponds to the other diaphragm surface 5b.

The backing members 8 and 9 are provided with backing members 8A, 9A, 8B and 9B on the surface facing the steel pipe inner surface 1a and the surface facing the diaphragm surfaces 5a and 5b, respectively. Here, the backing material 8A, 9A, 8
B and 9B are for preventing leakage of molten metal,
Asbestos and rock wool are used.

The backing material supporting device 60 corresponding to one side is provided with an outer cylinder 61 which is fitted inside the arm rod 31 and is fitted outside the intermediate cylinder 53. Brackets 62 are fixed at a plurality of locations (eight locations in the embodiment) at the distal end of the bracket. These brackets 62 are projected outward through slits 43 formed in the arm rod 31,
A swing link 64 is connected to the protruding portion via a connecting pin 63 in a direction orthogonal to the arm rod center 33.

The two swing links 64 are one set, and a supporting member 65 of one backing material 8 is provided between the free ends of each set.
Are connected to each other via a connecting pin 66 in a direction along the connecting pin 63 so as to be relatively swingable. Here, the support member 65 is
The backing material 8 is configured to be held in a magnet format or the like. A spring (elastic body) 67 is provided between the swing link 64 and the distal end of the arm rod 31 for urging the swing link 64 to swing toward the arm rod center 33 side.

The proximal end of the outer cylinder 61 extends into the case body 34, and an outer bracket 68 is fixed to the proximal end.
An outer cylinder 61 is provided between the outer bracket 68 and the case 34.
Outer cylinder devices 69 for pushing and pulling the arm along the arm / bar center 33 are provided at a plurality of locations around the arm / bar center 33. Here the outer cylinder body 69
When 61 is pushed to the distal end, the swing link 64
The support member 65 is moved up and down against the center of the arm rod 33 by being raised and swung against the arm 67, so that the backing metal 8 is attached to the corner formed by the inner surface 1a of the rectangular steel pipe 1 and the diaphragm surface 5a. It is configured to abut. The backing material supporting device 60 corresponding to one side is constituted by 61 to 69 described above.

The backing material support device 70 corresponding to the other side is provided with an inner cylinder 71 fitted inside the intermediate cylinder 53,
Brackets 72 are fixed to a plurality of locations (eight locations in the embodiment) at the distal end of the inner cylindrical body 71 and in the circumferential direction. A first swing link 74 is connected to these brackets 72 via connection pins 73 in a direction perpendicular to the arm rod center 33. The proximal end of the inner cylindrical body 71 reaches the inside of the case body 34, and an inner bracket 75 is fixed to the proximal end, and the inner cylindrical body 71 is armed between the inner bracket 75 and the case body 34. Inner cylinder devices 76 for pushing and pulling along the rod center 33 are provided at a plurality of locations around the arm rod center 33.

A rod body 77 fitted inside the inner cylinder body 71 is provided, and brackets 78 are fixed to the distal end of the rod body 77 and at a plurality of locations (eight locations in the embodiment) in the circumferential direction. . A second swing link 80 is connected to these brackets 78 via a connecting pin 79 in a direction orthogonal to the arm rod center 33. Further, the tip of the first swing link 74 is connected to the intermediate portion of the second swing link 80 via a connecting pin 81 in a direction orthogonal to the arm rod center 33 so as to be relatively swingable. I have.

The second swing link 80 is a set of two, and between the free ends of each set is a support member 82 of the other backing material 9.
Are connected to each other via a connecting pin 83 extending in a direction along the connecting pin 81 so as to be relatively swingable. Here, the support member 82
The backing material 9 is configured to be held by a magnet type or the like. Then, the base end of the rod body 77 reaches the inside of the case body 34, and between the base end and the case body 34, a center side for pushing and pulling the rod body 77 along the arm rod center 33. A cylinder device 84 is provided.

Here, when the rod body 77 is pulled toward the proximal side by the center cylinder device 84, the bracket 78 is moved closer to the bracket 72, and thereby the bracket 78 is moved around the connecting pin 79 around the connecting pin 79. The second swing link 80 is erected and swung, and the second swing link 80 and the first swing link 74 are relatively swung around the connection pin 81, so that the support member 82 is moved to the arm rod center 33. Then, the backing metal 9 is moved closer to the inner surface 1 a of the rectangular steel pipe 1.

In parallel with this, the inner cylinder 71 is pulled toward the base end by the inner cylinder device 76, so that the two swinging links 74 and 80 are also moved together. The backing metal 9 is configured to be brought into contact with a corner formed by the diaphragm 1a and the diaphragm surface 5a. More than 71-84
Thus, the backing material supporting device 70 corresponding to the other side is configured.

Each cylinder device 58, 69, 76, 84
Hydraulic type, pneumatic type, screw type, etc. are adopted. The operation of the above embodiment will be described below.

First, as shown in FIG.
With the 30 pulled out (retracted), the rectangular steel pipe 1 is supported on the support device 10 in a horizontal direction. Then, the diaphragm 5 and the backing materials 8 and 9 are set in the material-to-be-welded 30 fed out.

That is, as shown in FIG. 3, a small-diameter cylindrical portion provided at the distal end of the arm rod 31 in the diaphragm support device 50.
The diaphragm 5 is fitted to the outside of the diaphragm 5 through the through hole 6 so that the diaphragm surface 5a contacts the step 52. Then, the intermediate cylinder 53 is pulled toward the base end side by the cylinder device 58 for the support device, so that the group of holding members 55 is moved away from the arm rod center 33 by the cam surface 54a and the cam surface 55a. The diaphragm 5 is pressed against the inner surface of the through-hole 6 to support the diaphragm 5.

Further, in the backing material support device 60 corresponding to one side, the outer cylinder 61 is pulled toward the base end by the outer cylinder device 69, thereby moving each swing link 64 to the base end. At the same time, the support member 65 is caused to swing sideways by the elastic force of the spring 67, thereby moving each support member 65 closer to the arm rod center 33. Then, one of the backing members 8 is supported by each of the support members 65.

The backing material supporting device 70 corresponding to the other side
In, the inner cylinder 71 is pushed and moved by the inner cylinder 76, and the rod 77 is pushed and moved by the center cylinder 84. As a result, each second swing link 80 is caused to swing sideways, and both swing links 74 and 80 are moved to the distal end side, whereby the support member 82 is moved closer to the arm bar center 33. Then, each of the support members 82 supports the backing material 9 on the other side.

As described above, the diaphragm 5 is supported by the diaphragm supporting device 50, and before and after the diaphragm 5, the backing materials 8, 9 are supported by the backing material supporting devices 60, 70, and on the side of the arm rod center 33 side. The carriage 35 is made to move forward in the state of the approach movement, and the arm rod 31 is inserted into the rectangular steel pipe 1 from the front end side. At this time, the distal end portion of the arm rod 31 is first supported and guided by the guide device 40, and the guided device 45 is inserted into the inner surface 1a of the square steel pipe 1.
Therefore, the insertion is stably and surely performed.

Since the rectangular plate-shaped diaphragm 5 is formed to have a small gap S between itself and the inner surface 1a of the rectangular steel pipe 1, it can be inserted without collision or clogging. At that time, the insertion movement of the arm rod 31 is controlled by the control device (so that the diaphragm 5 and the backing members 8 and 9 are at predetermined positions in the rectangular steel pipe 1 as shown in the imaginary line of FIG. 1 and FIG. (Not shown)).

Next, the backing members 8, 9 are moved away from the center of the arm rod 33 by the backing material supporting devices 60, 70, and as shown in FIG. 4, the inner surface 1a of the rectangular steel pipe 1 and the diaphragm surface 5a,
5b.

That is, on one side, the outer cylinder 61 is pushed and moved toward the distal end by the outer cylinder device 69, so that each swing link 64 is erected and oscillated against the spring 67.
Each support member 65 is moved away from the center of the arm rod 33, so that the backing material 8 can be brought into contact with the corner formed by the inner surface 1a of the rectangular steel pipe 1 and the diaphragm surface 5a.

On the other side, the rod 78 is pulled toward the base end by the central cylinder device 84, so that the bracket 78 moves closer to the bracket 72, and each second swing link 80 is moved. While standing up and swinging, the second swinging link 80 and the first swinging link 74 are relatively swung,
By moving each support member 82 away from the arm rod center 33,
The backing material 9 is moved closer to the inner surface 1 a of the rectangular steel pipe 1. At about the same time, the inner cylinder 71 is pulled toward the proximal end by the inner cylinder device 76, whereby the two swinging links 74 and 80 are integrally moved, whereby the inner surface 1a of the square steel pipe 1 and the diaphragm are moved. The backing material 9 can be brought into contact with the corner formed by the surface 5a.

With the diaphragm 5 and the back and forth backing members 8 and 9 set in this way, the diaphragm 5 and the two backing members 8 and 9 are passed through the hole 3 formed in the square steel tube 1 to the square steel tube 1. Perform welding. Prior to the welding operation, the backing device 24 is set. That is, as shown in FIG. 5, the backing material 28 is inserted from below into the lower hole 3 formed corresponding to the welding equivalent portion, and the backing material 28 is moved in the insertion direction by the spring 29, as shown in FIG. This can be done by energizing. At this time, the horizontal hole 3 is closed by another backing material 28.

In this state, the welding wire 21 is inserted into the upper hole 3 of the square steel pipe 1 from above and then inserted downward in the gap S, so that an electroslag welding machine, an electrogas arc welding machine, etc. Thereby, welding A of the diaphragm 5 and the backing members 8 and 9 to the square steel pipe 1 can be sequentially performed from below to above. At this time, the backing material 28 can prevent the molten metal from leaking downward or to the side from the hole 3 and can prevent the molten metal from leaking to the front and rear inner surfaces 1a and the diaphragm surfaces 5a and 5b by using the backing materials 8A and 9A. 8B and 9B can prevent this.

The welding A as described above is performed on one side of the diaphragm 5 and similarly on the other side. The welding A may be performed simultaneously on both side edges. After the intended welding to the left and right side edges in this manner, welding A of the upper edge side and the lower edge side is performed by moving the upper edge side and the lower edge side to the both side edges. For that purpose, the square steel pipe 1 is rotated by 90 degrees,
And the diaphragm supporting device 50 and both backing material supporting devices 60,
Rotate 70 in the same way.

That is, the rectangular steel pipe 1 can be rotated by driving the two drive supporting portions 11 in synchronization with each other so as to be supported and guided by the drive supporting portion 11 and the floating support portion 12. The rotation of the diaphragm support device 50 and the two backing material support devices 60 and 70 can be performed by rotating the rotation drive device 39 in synchronization with the drive support portion 11 and rotating the arm rod 31 around the arm rod center 33. As a result, the diaphragm support device 50 and the backing material support devices 60 and 70
The rectangular steel pipe 1 can be rotated without imposing a burden on the steel pipe.

Thereafter, welding A is performed on the remaining edges in the same manner as described above, and the diaphragm supporting device 50 and the backing material supporting devices 60 and 70 are extracted. That is, FIG.
As shown in the figure, the intermediate cylinder 53 is pushed and moved toward the distal end by the cylinder device 58 for the supporting device, and the group of holding members 55 is guided by the guide hole 56 by the cam surface 54a and the cam surface 55a. The diaphragm 5 is moved closer to the center 33.
Is loosely fitted into the through hole 6 to release the holding of the diaphragm 5.

Next, in the backing material support device 60 corresponding to one side, the outer cylinder body 61 is pulled toward the base end by the outer cylinder device 69, thereby moving the swing link 64 to the base end. The support member 65 is moved closer to the arm bar center 33 by the laterally oscillating movement by the elastic force of the spring 67, and the support to one backing material 8 is released.

The backing material supporting device 70 corresponding to the other side
In, the inner cylinder 71 is pushed and moved by the inner cylinder 76, and the rod 77 is pushed and moved by the center cylinder 84. Thereby, the second swing link
At the same time, the swinging link 74 and 80 are moved to the tip side while the supporting member 82 is moved closer to the center of the arm rod 33 to support the backing material 9 on the other side. Release.

As described above, the release of the support of the diaphragm 5 by the diaphragm support device 50 and the backing material support device 60,
Release support of backing materials 8 and 9 by 70,
After the backing material supporting devices 60 and 70 are moved to the arm rod center 33 side, the carriage 35 is caused to retreat, whereby the arm rod 31 can be pulled out from the rectangular steel pipe 1. At this time, the diaphragm supporting device 50 and the backing material supporting device 70 on the other side can be pulled out of the welded diaphragm 5 through the through hole 6.

Then, as mentioned earlier, the diaphragm 5
After the support of the backing materials 8 and 9 is performed, the supply to the next location and the welding A are performed in the same manner. The holes 3 are filled by overlay welding or the like.

In the manner described above, for example, the support 85 as shown in FIG. 6 is manufactured, and the diaphragm 5 of the support 85 is formed.
The beam material 86 is connected to the portion where is attached by welding.
In the above-described embodiment, a link mechanism or the like is used in the distal end working portion of the diaphragm support device 50 or the backing material support devices 60 and 70. According to this, since air, hydraulic pressure, and electricity are not used, the welding temperature and the like are reduced. Can withstand enough. However, in the present invention, a type using air, hydraulic pressure, or electricity provided with heat-resistant means may be used.

In the above-described embodiment, the diaphragm 5 can be mounted at an accurate position by controlling the insertion amount of the arm rod 31 by using, for example, a distance sensor or a detection sensor for the hole 3.

In the above-described embodiment, the rectangular steel pipe 1 and the material-supplying device 30 are simultaneously rotated by 90 degrees, whereby the inside can be efficiently welded. However, in the present invention, after welding the pair of side edge portions, the welding material supply device 30 is extracted once, and the rectangular steel pipe 1 is rotated 90 degrees by a crane, a forklift or the like, and then the welding material supply device is removed. The remaining portion may be welded by inserting the 30 again.

In the above-described embodiment, the rectangular steel pipe 1 and the workpiece supply device 30 are integrally rotated by synchronously driving the drive support portion 11 and the rotary drive device 39. By providing only one of the part 11 and the rotation drive device 39,
The portion corresponding to the other side may be driven to rotate (idle).

In the above embodiment, welding is performed by an electroslag welding machine or an electrogas arc welding machine. According to this, high-quality welding can be performed in a short time.

In the above embodiment, the backing members 8 and 9
Is provided with backing material 8A, 9A, 8B, 9B,
According to this, high quality welding can be performed with good airtightness and no leakage of molten metal.

[0059]

According to the first aspect of the present invention, in a state where the diaphragm is supported by the diaphragm supporting device, the backing material is supported by the backing material supporting device, and the diaphragm is moved toward the center of the arm rod, The diaphragm can be inserted at a desired position in the rectangular steel pipe by inserting the arm rod into the rectangular steel pipe supported laterally by the support device. Then, the backing material is moved away from the center of the arm rod and brought into contact with the corner formed by the inner surface of the rectangular steel pipe and the diaphragm surface. Welding can be performed , backing
The material is brought into contact with the corner via the backing material
High quality welding with good airtightness and no leakage of molten metal
It can be carried out. Thereafter, the support of the diaphragm and the support of the backing material are released, and the arm rod can be pulled out by moving the backing material support device toward the center of the arm rod.

Thus, the diaphragm can be mounted at a desired position in the rectangular steel pipe without cutting the rectangular steel pipe, and the mounting can be performed quickly, inexpensively, and with a reduced number of welding points. .

[Brief description of the drawings]

FIG. 1 shows an example of an embodiment of the present invention, and is a cross-sectional plan view of main parts at the time of extraction after welding in a method of attaching a diaphragm to a rectangular steel pipe.

FIG. 2 is a side view of the equipment in the method of mounting the diaphragm in the rectangular steel pipe.

FIG. 3 is a partially cutaway side view before welding at the time of insertion in the method of attaching the diaphragm to the same square steel pipe.

FIG. 4 is a partially cutaway side view at the time of welding in the method of mounting the diaphragm in the rectangular steel pipe.

FIG. 5 is a partially cutaway front view before welding at the time of insertion in the method of mounting the diaphragm in the rectangular steel pipe.

FIG. 6 is a vertical cross-sectional view showing a state in which a beam is connected to the manufactured support.

FIG. 7 is a longitudinal sectional view showing a conventional embodiment and showing a state in which a beam is connected to a support.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Square steel pipe 1a Inner surface 3 hole 5 Diaphragm 5a Diaphragm surface 5b Diaphragm surface 6 Through hole 8 One backing material 8A Backing material 8B Backing material 9 The other backing material 9A Backing material 9B Backing material 10 Supporting device 20 Welding machine 21 Wire 24 Backing device 28 Backing material 30 Welding material supply device 31 Arm rod 33 Arm rod center 35 Cartridge 50 Diaphragm support device 51 Small diameter cylinder 52 Step 53 Intermediate cylinder 54 Cam 55 Holder 60 Backing material support 61 Outer cylinder 64 Swing link 65 Support member 70 Backing material support device 71 Inner cylinder 74 First swing link 77 Rod body 80 Second swing link 82 Support member 85 Support column 86 Beam material S Gap

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B23K 9/00 B23K 37/06 E04B 1/24

Claims (1)

(57) [Claims] A rectangular steel pipe is supplied to a rectangular steel pipe (1) supported laterally by a support device (10 ) and supplied with a diaphragm (5) by a material-to-be-welded supply device (30) for welding.
At a predetermined position where the diaphragm (5) of (1) is to be attached, a pair of flat portions (1 ) forming each corner (1B) is provided.
Each hole (3) on the end of A) previously formed in the thickness direction, the welding material supply device (30) is inserted <br/> for the RHS (1) in抜動freely Ude杆( 31) has, on the distal end side of the Ude杆(31), a diaphragm (5) supporting and supported releasable diaphragm support device (50), a pair of front and rear backing material (8,
9) can be supported and unsupported via the support members (65, 82), respectively , and the support members (65, 82) can be
Backing support device configured to freely toward and away from dynamic for (6
0) , the diaphragm (5) is supported by the diaphragm support device (50) , and the steel pipe inner surface (1a) and the diaphragm surfaces (5a, 5b) are opposed before and after the diaphragm (5). Backing material on surface
Backing material provided with (8A, 8B, 9A, 9B)
(8, 9) to the support member (6 ) of the backing material support device (60).
5 and 82) and moved closer to the center of the arm rod (33) via the support members (65 and 82) , first, the diaphragm (5 ) is inserted by the insertion movement of the arm rod (31). ) And the backing material (8, 9) are inserted to a predetermined position in the rectangular steel pipe (1) , and then the support member of the backing material support device (60)
(65,82) backing material through the (8, 9) the arm杆中heart (3
3) Move it away from the side to make the inner surface (1 )
a) and the diaphragm surface (5a, 5b) are brought into contact with a corner portion formed by a backing material (8A, 8B, 9A, 9B), and are passed through a hole (3) formed in a square steel pipe (1). The diaphragm (5) and the front and back backing materials (8, 9) are welded to the steel pipe (1) , and then the diaphragm (5) is unsupported by the diaphragm supporting device (50) and the backing material supporting device (60) support members (65, 82)
After performs a support release backing material (8, 9), moving the support member (65,82) of backing material supporting device (60) in the arm杆中center (33) side by, Ude杆( 31) A method for mounting a diaphragm in a rectangular steel pipe, wherein the diaphragm is removed.