JP3257935B2 - Mounting method of inner diaphragm in rectangular 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 of attaching an inner diaphragm to a rectangular steel pipe which is used to attach an inner diaphragm to a side of a pillar, for example, when connecting pillars of a steel structure with beams. It is.

[0002]

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

The beam (mainly H-shaped steel) 100 is connected to the column 99 thus formed by welding the free end of the beam 100 to both the diaphragms 94 and 97 and the column 91. I was And, both diaphragms 94 and 97 served to transmit the stress.

[0004] However, according to the above-mentioned conventional configuration, since the supporting columns 99, that is, the rectangular steel pipes are divided into a plurality of pieces, and then the diaphragms 94 and 97 are attached, a large amount of time and cost is required for the dividing work. There are problems such as many welds.

Therefore, as a method of not cutting the rectangular steel pipe, there is provided a method of positioning and welding a diaphragm in an extremely thick large-diameter rectangular steel pipe as disclosed in, for example, JP-A-7-238636. In this conventional method, an inner diaphragm having a backing metal temporarily attached and welded to both sides thereof is inserted into a square steel pipe, engaged with a knock pin fitted in a through-hole, positioned at a predetermined position, and then placed at the insertion port side. After the backing metal is tack-welded to the inner wall of the rectangular steel pipe, the inner wall of the rectangular steel pipe and the outer periphery of the inner diaphragm are elect-slag welded using the through holes.

[0006]

In the above-mentioned construction method in which the rectangular steel pipe is not divided, the outer diameter of the backing metal is allowed to contact the inner wall of the rectangular steel pipe without any gap, for example, by allowing a gap of about 0.5 mm. Therefore, when the inner diaphragm is inserted into the rectangular steel pipe, the inner diaphragm is caught or jammed, so that the inner diaphragm cannot be easily inserted. Further, when the inner surface of the rectangular steel pipe has changed in irregularities, the insertion itself cannot be performed. To cope with this, it is sufficient to make a sufficient gap, but if this gap is large, the molten metal of the electroslag welding is placed in the space surrounded by the square steel pipe, the inner diaphragm, and both backing metals. When the molten metal stays, the molten metal may leak to the outside from the gap, and good welding may not be performed.

Therefore, according to the first aspect of the present invention, the inner diaphragm can be easily and smoothly inserted into the rectangular steel pipe with a sufficient clearance, and the molten metal leaks to the outside during welding. It is an object of the present invention to provide a method of attaching an inner diaphragm to a square steel pipe which can be performed without any problem.

Another object of the present invention is to provide a method of mounting an inner diaphragm in a rectangular steel pipe in which the inner diaphragm and the backing metal can be inserted into the rectangular steel pipe in a fully automatic manner. is there.

[0009]

In order to achieve the above-mentioned object, according to the present invention, a method for mounting an inner diaphragm in a rectangular steel pipe according to the present invention is a method for welding an inner diaphragm to a rectangular steel pipe by welding. The diaphragm of the square steel pipe
At a predetermined position to be attached, a pair of
Through holes are formed at the ends of the flat
Can, welded diaphragm inner are integrated Meanwhile backing to the outer periphery of one surface thereof is inserted into a predetermined position in the square tube, and then on the other hand a backing against the inner surface of the square tube, and the other backing material To the corner formed by the inner surface of the rectangular steel pipe and the other surface of the inner diaphragm, and then the other backing material is welded to the inner surface of the rectangular steel pipe and the other surface of the inner diaphragm,
Next, the inner diaphragm and both backing members are welded to the inner surface of the rectangular steel pipe through through holes formed in the rectangular steel pipe.

Therefore, according to the first aspect of the present invention, the outer dimension of the backing material integrated with the inner diaphragm is determined by taking into account the expected unevenness of the inner surface of the rectangular steel pipe in consideration of the expected amount of unevenness of the inner surface of the rectangular steel pipe. The inner diaphragm can be inserted without being caught or clogged by forming the gap so as to have a gap. Then, by each welding, a welding space formed by the inner surface of the rectangular steel pipe, the inner diaphragm outer surface, and the two backing materials can be formed in a sealed shape, and therefore, the inner diaphragm and the two backing materials with respect to the inner surface of the rectangular steel pipe through the through holes. Can be welded without the molten metal leaking to the inner surface of the front and rear rectangular steel pipes, and the molten metal does not leak to one surface of the inner diaphragm or the other surface of the inner diaphragm.

According to a second aspect of the present invention, there is provided a method for mounting an inner diaphragm in a rectangular steel pipe, wherein the inner diaphragm is supplied to a rectangular steel pipe laterally supported by a support device by a welding material supply device and welded. The square steel pipe
Each corner must be in the desired position to attach the
A through hole is formed at each end of a pair of flat plates to form
The inner diaphragm has one backing material integrated with the outer periphery of one surface thereof, and the material-to-be-welded supply device has an arm rod which can be inserted and withdrawn in a rectangular steel pipe. An inner diaphragm support device that can support and release the inner diaphragm and a backing material support device that can support and release the backing material and move closer to and away from the center of the arm and bar are provided at the distal end side. Then, while supporting the inner diaphragm by the inner diaphragm support device, on the other surface side of the inner diaphragm, while supporting the other backing material by the backing material support device and moving closer to the arm rod center side, By the movement of the arm rod, the inner diaphragm integrating the one backing material and the other backing material are inserted to a predetermined position in the rectangular steel pipe, and then the one backing material is welded to the inner surface of the square steel pipe. And backing The other backing material is moved away from the center of the arm rod by the material supporting device, and is brought into contact with a corner formed by the inner surface of the rectangular steel pipe and the other surface of the inner diaphragm. And the other surface of the inner diaphragm, and then release the support of the inner diaphragm by the inner diaphragm support device and release the support of the backing material by the backing material support device. Side, then pull out the arm rod, and then
Through the through holes formed in the rectangular steel pipe, the inner diaphragm and the two backing members are welded to the inner surface of the rectangular steel pipe.

Therefore, according to the second aspect of the present invention, the inner diaphragm is supported by the inner diaphragm supporting device on the distal end side of the arm rod, and the other backing material is supported by the backing material supporting device and is positioned at the center of the arm rod. By inserting this arm rod into the rectangular steel pipe supported laterally by the support device in the state of being moved closer, the inner diaphragm can be inserted at a desired position in the rectangular steel pipe.

Next, after one backing material is welded to the inner surface of the rectangular steel pipe, the other backing material is moved away from the center of the arm rod to abut on the corner formed by the inner surface of the rectangular steel pipe and the inner diaphragm surface. Then, the other backing material is welded to the inner surface of the rectangular steel pipe and the other surface of the inner diaphragm, so that a sealed welding space can be formed by the inner surface of the rectangular steel pipe, the outer surface of the inner diaphragm, and the two backing materials. After or during this welding, the support of the inner diaphragm and the support of the other backing material are released, the arm rod is pulled out, and then the welding is performed by using the welding space through the through hole. The inner diaphragm can be attached to a desired position in the rectangular steel pipe.

[0014]

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

As shown in FIGS. 3 and 10, the 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 corner 1B has
Through holes 3 are formed (pierced) in the thickness direction at the ends of the pair of flat plates 1A forming the corners 1B. These through holes 3 are formed corresponding to predetermined positions where an inner diaphragm (described later) is to be attached .

The rectangular steel pipe 1 is mainly an extremely thick steel pipe having a large wall thickness, for example, having a thickness t of 16 to 60.
mm, material is SS400-SM520B, outer diameter is 450-850mm
It is. The square steel pipe 1 is formed, for example, by welding a one-seam square steel pipe formed by hot roll forming, a two-seam square steel pipe formed by butt-welding a pair of grooves formed by hot press forming, and welding a pair of rolled grooves. Two-seam square steel pipes, two-seam square steel pipes in which a pair of rolled angle members are welded face to face, a four-sided box, a seamless steel pipe, and the like, all of which are made of existing ultra-thick and large-diameter steel pipes.

The inner diaphragm 5, which is supplied into the rectangular steel pipe 1 and welded thereto, has a rectangular plate shape, and its outer dimension is such that a sufficient gap is formed between the inner surface 1a and the four sides of the rectangular steel pipe 1. Is set to And inner diaphragm 5
A through portion 6 having a predetermined inner diameter (which will be described later) is formed at the center of.

One surface 5a of the inner diaphragm 5, that is, the one surface 5a which is the side to which the inner diaphragm 5 first enters when it is inserted into the rectangular steel pipe 1, is integrally formed on the outer periphery thereof with a backing material 8 by welding 73. Have been. Here, the one backing material 8 is formed by integrating a rod-shaped body having a rectangular cross section into a frame shape, and is integrated with the inner diaphragm one surface 5a by the welding 73 via the inner surface.

At this time, the outer dimension of the backing material 8 is larger than the outer dimension of the inner diaphragm 5, and is formed to have a gap S between the inner surface 1 a and the four sides of the rectangular steel pipe 1. Here, the gap S is set so as not to be caught or clogged when inserted into the rectangular steel pipe 1 in consideration of the expected amount of unevenness of the rectangular steel pipe inner surface 1a. A groove 8A is formed on a surface facing the other side of the one backing material 8 and on the outer edge side.

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 square steel pipe 1 is inserted into the group of large-diameter gears 15 by moving the square steel pipe 1 in the axial direction of the pipe at this installation work site, or by inserting the square steel pipe 1 in 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 10, a welding machine 20 and a backing device 24 are provided at the installation site. That is, the welding machine 20 is an electroslag welding machine, an electrogas arc welding machine, or the like, and the welding wire 21 is configured to be insertable from above into the through hole 3 in the vertical direction above the square steel pipe 1. An earth 22 is configured to be freely connected to a position remote from the rectangular steel pipe 1.

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 integrated with the upper end of the piston rod 27 and inserted from below into the vertical through hole 3 below the rectangular steel pipe 1. The backing member 28 includes a material (asbestos and rock wool) 28 and a spring (elastic body) 29 for urging the backing material 28 in the insertion direction. The mounting position of the backing device 24 is configured to be freely changeable.

[0025] At the installation site, the supporting device
A welded material supply device 30 for supplying the inner diaphragm 5 and the like is provided in the rectangular steel pipe 1 supported in a horizontal direction by 10. That is, the welding material supply device 30 includes the square steel pipe 1
An arm rod 31 that can be inserted into and removed from the inside is provided. This arm
31 has a cylindrical shape, 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-side 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.

At the distal end of the arm 31, there is provided an inner diaphragm supporting device 50 capable of supporting and releasing the inner diaphragm 5 by operation from the proximal end of the arm 31. That is, as shown in FIG. 1 to FIG. 3 and FIG. 10, a small-diameter cylindrical portion 51 is integrated with the tip of the arm rod 31, and a step 52 is formed between the arm rod 31 and the small-diameter cylindrical section 51. Have been. Here, the outer diameter of the small-diameter cylindrical portion 51 is set smaller than the inner diameter of the through portion 6.
Therefore, the inner diaphragm 5 can be externally fitted to the small-diameter cylindrical portion 51 through the penetrating portion 6, and the other one of the pair of inner diaphragm surfaces, that is, the other inner diaphragm surface 5b on the side of the bogie 35 contacts the step portion 52. Touched.

An inner cylindrical body 53 is fitted in the arm rod 31 at a plurality of positions (or the entire circumference) at the tip of the inner cylindrical body 53 and in the circumferential direction.
The cams 54 are fixed to the outer surfaces of the cams 54, and the outer surfaces of the cams 54
a. A plurality of holding members 55 having a cam surface 55a to be brought into contact with the cam surface 54a are provided, and these holding members 55 are fitted into guide holes 56 formed in the small-diameter cylindrical portion 51 so that the center of the arm rod is formed. It is configured to move toward and away from 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 inner bracket 57 is fixed to the base end of the inner cylinder 53, and a second bracket for pushing and pulling the inner cylinder 53 along the arm rod center 33 is provided between the inner bracket 57 and the case body 34. One-cylinder devices 58 are provided at a plurality of locations around the arm bar center 33.

Here, the first cylinder device 58 controls the inner cylinder body.
When the base member 53 is pulled toward the base end side, the group of the holders 55 is moved away from the arm rod center 33 by the cam surface 54a and the cam surface 55a, and pressed against the inner surface of the through portion 6 of the inner diaphragm 5. Thus, the inner diaphragm 5 is held. Also the first
When the inner cylindrical body 53 is pushed and moved to the distal end side by the cylinder device 58, the holding member 55 is formed by the cam surface 54a and the cam surface 55a.
The group is moved closer to the arm rod center 33 and is loosely fitted into the penetrating portion 6 of the inner diaphragm 5, whereby the holding of the inner diaphragm 5 is released. The inner diaphragm supporting device 50 is constituted by 51 to 58 described above.

On the distal end side of the arm rod 31, the backing material 9 can be supported and released freely and can be moved toward and away from the arm rod center 33 by operating from the base end side of the arm rod 31. A patch support device 60 is provided. The other backing material 9 is formed of a rod-shaped body having a rectangular cross section, and is disposed in a divided frame shape so as to face the rectangular steel pipe inner surface 1a so as to be supported by the backing material support device 60. It is configured. The other backing material 9 corresponds to the other surface 5b of the inner diaphragm.

The backing material support device 60 includes the arm rod 31
An outer cylinder body fitted inside and externally fitted to the inner cylinder body 53
A bracket 62 is fixed to the distal end of the outer cylindrical body 61 and at a plurality of locations (eight locations in the embodiment) in the circumferential direction. These brackets 62 are projected outward through slits 43 formed in the arm rod 31, and the projecting portions have connecting pins 63 in a direction orthogonal to the arm rod center 33.
The oscillating link 64 is connected via the.

The two swing links 64 are one set, and between the free ends of each set, the support member 65 of the other backing material 9 is provided.
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 other backing material 9 is configured to be held by a magnet type 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. Is provided with a stopper body 68 that regulates the maximum swing amount toward the arm rod center 33 side.

The proximal end of the outer cylinder 61 reaches the inside of the case body 34, and an outer bracket 69 is fixed to the proximal end.
An outer cylinder 61 is provided between the outer bracket 69 and the case 34.
The second cylinder device 70 is provided at a plurality of positions around the arm rod center 33 for pushing and pulling the arm along the arm rod center 33. Here, the outer cylinder is formed by the second cylinder device 70.
When 61 is pushed to the distal end, the swing link 64
The supporting member 65 is moved up and down against the center of the arm rod 33, and the supporting member 65 is moved to the corner formed by the inner surface 1a of the rectangular steel pipe and the other surface 5b of the inner diaphragm. Are brought into contact with each other. The backing material support device 60 is constituted by 61 to 70 described above. Each cylinder device 5
For 8, 70, hydraulic, pneumatic or screw type is adopted.

The operation of attaching the inner diaphragm 5 to the inside of the rectangular steel pipe 1 in the above embodiment will be described below. First, as shown in FIG. 1 and 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 inner diaphragm 5 in which the backing material 8 is integrated and the other backing material 9 are set in the to-be-welded workpiece supply device 30 that has been pulled out.

That is, as shown in FIGS. 2 and 10, the inner diaphragm 5 is fitted to the small-diameter cylindrical portion 51 provided at the tip of the arm rod 31 in the diaphragm support device 50 through the through portion 6 thereof. One surface 5a of the inner diaphragm is brought into contact with the step 52. Then, the inner cylinder 53 is pulled toward the base end by the first cylinder device 58, so that the cam surface 54a and the cam surface 55
As a result, the group of holders 55 is moved away from the center 33 of the arm and rod and pressed against the inner surface of the through portion 6 of the inner diaphragm 5, thereby supporting the inner diaphragm 5.

Further, in the backing material support device 60 corresponding to one side, each swing link 64 is moved to the base end side by pulling the outer cylinder 61 to the base end side by the second cylinder device 70. At the same time as the stopper 67 is brought into contact with the stopper body 68 by the elastic force of the spring 67.
65 is moved closer to the arm center 33. Then, each of the support members 65 supports the other backing material 9.

As described above, the inner diaphragm 5 is supported by the diaphragm supporting device 50, and the other backing material 9 is supported by the backing material supporting device 60 on the other surface side of the inner diaphragm 5, and the arm bar center 33 side In this state, the rotation drive device 39 is driven as necessary,
The phase of the inner diaphragm 5 with respect to the square steel tube 1 is adjusted by rotating the arm 31 around the arm rod center 33. Then trolley 35
Is caused to travel forward, and the arm 31 is inserted into the rectangular steel pipe 1 from the tip end thereof. Then, the distal end portion of the arm rod 31 is first supported and guided by the guide device 40, and then the guided device 45 is inserted and supported and guided by the inner surface 1a of the rectangular steel pipe. It is done reliably.

At this time, the outer dimension of the backing material 8 integrated with the inner diaphragm 5 is set between the inner surface of the rectangular steel pipe 1a and the outer dimensions of the rectangular steel pipe 1a in consideration of the expected unevenness of the inner surface 1a. Since each is formed to have a size in which the gap S is generated, it can be inserted without being caught or clogged. The insertion movement of the arm rod 31 is position-controlled by a control device (not shown) so that the inner diaphragm 5 is at a predetermined position in the rectangular steel pipe 1 as shown in the phantom line in FIG. 2 and in FIG. You.

Next, as shown in FIG.
Is welded 74 to the inner surface 1a of the rectangular steel pipe. This welding 74
Is sufficiently performed from the groove 8A formed on the backing material 8 to the inner surface 1a of the rectangular steel pipe and in the entire circumferential direction.

Thereafter, the other backing material 9 is moved away from the center of the arm rod 33 by the backing material support device 60, and the corner formed by the inner surface 1a of the rectangular steel pipe and the other surface 5b of the inner diaphragm as shown in FIG. Part. That is, by pushing and moving the outer cylinder 61 toward the distal end by the second cylinder device 70, each swing link 64 is erected and oscillated against the spring 67,
Each support member 65 is moved away from the arm rod center 33, and the other backing material 9 can be brought into contact with the corner formed by the inner surface 1a of the rectangular steel pipe and the other surface 5B of the inner diaphragm.

With the other backing material 9 set in this way, as shown in FIG. 6, the other backing material 9 is welded 75, 76 to the inner surface 1a of the rectangular steel pipe and the other surface 5b of the inner diaphragm. That is, the welding 75 is sufficiently performed from the other surface of the other backing material 9 to the inner surface 1a of the rectangular steel pipe and in the entire circumferential direction, and the welding 76 is performed from the inner surface of the other backing material 9 to the other portion of the inner diaphragm. This is performed sufficiently over the surface 5b and in the entire circumferential direction. The order of the weldings 75 and 76 may precede any order.

Thus, a sealed welding space 79 can be formed by the inner surface 1a of the rectangular steel pipe, the outer surface of the inner diaphragm 5, and the backing members 8, 9. After the weldings 75 and 76 are performed as described above, the release of the support of the inner diaphragm 5 by the inner diaphragm support device 50 and the release of the support of the other backing material 9 by the backing material support device 60 can be performed simultaneously or at any time. And the arm 31 is withdrawn.

That is, as shown in FIG. 7, in the inner diaphragm support device 50, the first cylinder device 58 pushes and moves the inner cylinder 53 toward the distal end, so that the inner cylinder body 53 is held by the cam surface 54a and the cam surface 55a. The group of bodies 55 is moved toward and away from the center 33 of the arm rod by the guide of the guide hole 56 to be loosely fitted in the penetrating portion 6 of the inner diaphragm 5, thereby releasing the holding of the inner diaphragm 5.

In the backing material supporting device 60, the second
By pulling and moving the outer cylinder 61 to the proximal end by the cylinder device 70, the swing link 64 is moved to the proximal end and the side link is rocked by the elastic force of the spring 67.
Is moved closer to the arm rod center 33, and the support for the backing material 9 is released.

As described above, the release of the support of the inner diaphragm 5 by the inner diaphragm support device 50 and the backing material support device
After releasing the support of the other backing material 8 by 60, the carriage 35 is caused to retreat, whereby the arm rod 31 can be pulled out from the rectangular steel pipe 1 as shown in FIGS. At that time, the inner diaphragm supporting device 50 can be pulled out of the welded inner diaphragm 5 through the through portion 6.

Thereafter, the inner surface 1a of the square steel pipe 1a is passed through the through hole 3 formed in the square steel pipe 1 and utilizing the welding space 79.
Of the inner diaphragm 5 and the backing materials 8, 9
Is performed. Prior to the welding operation, the backing device 24 is set. That is, the set is shown in FIGS.
As shown in FIG. 11, the backing material 28 is inserted from below into the lower through hole 3 formed corresponding to the portion corresponding to the welding, and the backing material 28 is urged to move in the insertion direction by the spring 29. You can do that. At this time, the horizontal through hole 3 is closed by another backing material 28.

In this state, the welding wire 21 is inserted into the upper through-hole 3 of the square steel pipe 1 from above and then inserted downward in the welding space 79, so that an electroslag welding machine or an electrogas arc welding can be performed. Diaphragm 5 against the inner surface 1a of the rectangular steel pipe by a machine or the like.
77 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 through hole 3, and can prevent the molten metal from leaking to the front and rear inner surfaces 1 a of the rectangular steel pipe by welding 74 and 75. Further, leakage of the molten metal to the inner diaphragm one surface 5a and the inner diaphragm other surface 5b can be prevented by the weldings 73 and 76.

The welding 77 as described above is used for the inner diaphragm 5.
On one side, and similarly on the other side. The welding 77 may be performed simultaneously on both side edges. After the intended welding 77 is performed on the left and right side edges in this way, the welding 77 between the upper edge and the lower edge is performed by moving the upper edge and the lower edge to the both edges. For this purpose, the rectangular steel pipe 1 is rotated by 90 degrees. The rotation of the rectangular steel pipe 1 is performed by synchronously driving the two drive supporting portions 11, so that the driving support portions 11 and the floating support portions 12 are driven.
Can be supported and guided.

The operation of attaching one inner diaphragm 5 to the square steel pipe 1 is completed as described above. After the inner diaphragm 5 and the other backing material 9 are supported as described above, supply to the next location and welding are performed in the same manner. The through holes 3 are filled by overlay welding or the like.

As described above, for example, the column 80 as shown in FIG. 12 is manufactured, and the beam 81 is connected to the outside of the portion of the column 80 to which the diaphragm 5 is attached by welding 82.

In the above-described embodiment, the rotation driving device 39 is driven as necessary, and the arm rod 31 is rotated around the arm rod center 33 to adjust the phase of the inner diaphragm 5 with respect to the rectangular steel pipe 1. However, if the square steel pipe 1 and the inner diaphragm 5 are relatively opposed to each other, the rotation becomes unnecessary, and the bearing 32 and the rotation drive device 39 can be omitted.

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 device 60. According to this, since air, hydraulic pressure, and electricity are not used, the welding temperature is 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 inner 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 through hole 3. May be positioned by a knock pin or the like inserted into the through hole 3.

In the above-described embodiment, the welding 75, 75 is set with the other backing material 9 set by the backing material support device 60.
Although 76 is performed, this may be performed after one of the weldings 75 and 76 is performed, the backing material supporting device 60 side is extracted, and the other welding is performed.

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 inner surface 1
The welding 74 of the backing material 8 to the
The groove 8A is formed through the groove 8A. However, the groove 8A may be formed without the groove 8A.

[0059]

According to the first aspect of the present invention, the outer dimensions of the backing material integrated with the inner diaphragm are determined by taking into consideration the expected unevenness of the inner surface of the rectangular steel pipe, and The inner diaphragm can be easily and smoothly inserted without gaps or clogging by sufficiently forming the gaps by forming the gaps so as to have a gap between them. Then, by each welding, a sealed welding space can be formed by the inner surface of the square steel pipe, the inner diaphragm outer surface, and both backing materials, and therefore, the welding of the inner diaphragm and the two backing materials to the inner surface of the square steel pipe through the through-holes, It is possible to always perform satisfactorily without the molten metal leaking to the inner surfaces of the front and rear rectangular steel pipes and the molten metal not leaking to one surface of the inner diaphragm or another surface of the inner diaphragm.

According to the second aspect of the present invention,
With the inner diaphragm supporting device supporting the inner diaphragm, the backing material supporting device supporting the other backing material, and moving closer to the arm rod center side, the arm rod is laterally supported by the supporting device. By inserting the inner diaphragm into the steel pipe, the inner diaphragm can be inserted at a desired position in the rectangular steel pipe.

Next, after one backing material is welded to the inner surface of the rectangular steel pipe, the other backing material is moved away from the center of the arm rod to abut on the corner formed by the inner surface of the rectangular steel pipe and the inner diaphragm surface. By welding the backing material to the inner surface of the rectangular steel pipe and the other surface of the inner diaphragm, a sealed welding space can be formed by the inner surface of the rectangular steel pipe, the outer surface of the inner diaphragm, and the two backing materials. After or during this welding, the support of the inner diaphragm and the support of the other backing material are released, the arm rod is pulled out, and then the welding is performed by using the welding space through the through hole. The inner diaphragm can be attached to a desired position in the rectangular steel pipe.

Accordingly, the inner diaphragm can be attached to a desired position in the rectangular steel pipe without cutting the rectangular steel pipe. At this time, the insertion of the inner diaphragm and the other backing material into the rectangular steel pipe can be performed. It can be done quickly and inexpensively in a fully automatic format.

[Brief description of the drawings]

FIG. 1 shows an example of an embodiment of the present invention, and is a partially cutaway side view at the time of completion of inner diaphragm installation in a method of attaching an inner diaphragm to a rectangular steel pipe.

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

FIG. 3 is a partially cutaway side view when the inner diaphragm is inserted in the method of attaching the inner diaphragm to the rectangular steel pipe.

FIG. 4 is a longitudinal sectional side view of a main part at the time of welding one backing material in the method of attaching the inner diaphragm to the inside of the rectangular steel pipe.

FIG. 5 is a longitudinal sectional side view of a main part when the other backing material is set in the method of attaching the inner diaphragm to the inside of the square steel pipe.

FIG. 6 is a longitudinal sectional side view of a main part at the time of welding the other backing material in the method of attaching the inner diaphragm to the same square steel pipe.

FIG. 7 is a partially cutaway side view of the method of attaching the inner diaphragm to the inside of the rectangular steel pipe during the removal of the inner diaphragm support device.

FIG. 8 is a partially cutaway side view at the time of welding in the method of attaching the inner diaphragm to the rectangular steel pipe.

FIG. 9 is a cross-sectional plan view of a main part at the time of welding in the method of attaching the inner diaphragm to the same square steel pipe.

FIG. 10 is a partially cutaway front view at the end of welding of one backing material in the method of attaching the inner diaphragm to the same square steel pipe.

FIG. 11 is a partially cutaway front view at the time of welding work in the method of attaching the inner diaphragm to the inside of the rectangular steel pipe.

FIG. 12 is a vertical cross-sectional view showing a state in which a beam is connected to the manufactured column.

FIG. 13 is a longitudinal sectional view showing a conventional embodiment and showing a state in which a beam is connected to a column.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Square steel pipe 1a Square steel pipe inner surface 3 Through hole 5 Inner diaphragm 5a Inner diaphragm one surface 5b Inner diaphragm other surface 6 Penetration part 8 One backing material 8A Groove part 9 The other backing material 10 Support device 11 Drive support part 12 Floating support part 20 Welding machine 24 Backing device 28 Backing material 30 Welding material supply device 31 Arm rod 33 Arm rod center 35 Truck 38 Travel drive 39 Rotation drive 40 Guide device 45 Guided device 50 Inner diaphragm support device 52 Step 55 Holder 60 Backing material support device 64 Swing link 65 Support member 73 Welding 74 Welding 75 Welding 76 Welding 77 Welding 79 Welding space S Gap

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-185291 (JP, A) JP-A-5-245629 (JP, A) JP-A-60-231581 (JP, A) JP-A-63-1988 212075 (JP, A) JP-A-61-279362 (JP, A) JP-A-48-44146 (JP, A) JP-A-5-50270 (JP, A) (58) Fields investigated (Int. ⁷ , DB name) B23K 9/028 B23K 9/00 B23K 37/00 B23K 37/06 E04C 3/32

Claims (2)

(57) [Claims] Attachment of a diaphragm of a square steel pipe to weld the inner diaphragm into the square steel pipe.
At predetermined positions, the ends of a pair of flat plates forming each corner are
Each through-hole is formed in the plate thickness direction, and an inner diaphragm integrating one backing material is inserted into the outer periphery of one surface to a predetermined position in the rectangular steel pipe, and then one backing material is inserted into the rectangular steel pipe. After the other backing material is brought into contact with the corner formed by the inner surface of the square steel pipe and the other surface of the inner diaphragm, the other backing material is welded to the inner surface of the square steel pipe and the other surface of the inner diaphragm. A method of attaching an inner diaphragm to a rectangular steel pipe, wherein the inner diaphragm and the two backing members are welded to the inner surface of the rectangular steel pipe through a through hole formed in the rectangular steel pipe. 2. A predetermined position at which a diaphragm of a rectangular steel pipe is to be mounted in order to supply an inner diaphragm by a material-to-be-welded supply apparatus and weld the inner diaphragm into a rectangular steel pipe supported laterally by a support device.
Each end of a pair of flat plates forming each corner.
The through hole is formed in the plate thickness direction, the inner diaphragm has one backing material integrated on the outer circumference of one surface, and the welding material supply device has an arm rod that can be inserted and removed in a square steel pipe. An inner diaphragm supporting device capable of supporting and releasing the inner diaphragm at the distal end side of the arm rod;
On the other hand, a backing material supporting device that can freely support and release the backing material and can move close to and away from the center of the arm rod is provided, and the inner diaphragm supporting device supports the inner diaphragm, and the inner diaphragm supports the inner diaphragm. On the surface side, with the other backing material supported by the backing material support device and moved closer to the center of the arm rod, first, the inner diaphragm that integrates the one backing material by the insertion movement of the arm rod The other backing material is inserted to a predetermined position in the square steel pipe, then one backing material is welded to the inner surface of the square steel pipe, and the other backing material is separated from the arm rod center side by the backing material support device. To make contact with the corner formed by the inner surface of the rectangular steel pipe and the other surface of the inner diaphragm, and then weld the other backing material to the inner surface of the rectangular steel pipe and the other surface of the inner diaphragm, and then support the inner diaphragm. Dress Release the support of the inner diaphragm by placing it, and release the support of the backing material by the backing material support device, move the backing material support device to the arm rod center side, then pull out the arm rod, and then A method of attaching an inner diaphragm to a rectangular steel pipe, wherein the inner diaphragm and the two backing members are welded to an inner surface of the rectangular steel pipe through a through hole formed in the rectangular steel pipe.