JP7395804B2 - How to weld steel walls - Google Patents

Description

The present invention relates to a method of welding steel walls.

A steel column welding method is known in which the column member and the joint panel member are rotated when an arc welding robot welds the outer circumferential weld between the column member and the joint panel member (for example, see Patent Document 1). ).

Japanese Patent Application Publication No. 11-33782

By the way, when an operator welds a welded part, downward welding is preferable from the viewpoint of quality and workability.

However, for example, if there are multiple welds oriented in different directions on a steel wall, in order to weld each weld downward, it is necessary to change the orientation of the steel wall for each weld, so the welding process is difficult. It takes a lot of time.

The present invention has been made in consideration of the above-mentioned facts, and an object of the present invention is to provide a steel wall welding method that can easily downwardly weld a plurality of welded parts having different directions.

A method for welding a steel wall according to a first aspect is a method for welding a steel wall having a plurality of welded portions in different directions, the steel wall being welded by a rotating shaft extending in the in-plane direction of the steel wall. In the supported state, the welded portion is welded.

According to the method for welding a steel wall according to the first aspect , the plurality of welded parts can be easily downwardly welded by rotating the steel wall around the rotation axis according to the orientation of the plurality of welded parts. I can do it.

The method for welding a steel wall according to a second aspect is the method for welding a steel wall according to the first aspect , in which the steel wall is rotated about the rotation axis and the welded portion is directed upward. Weld the welded portion.

According to the method for welding a steel wall according to the second aspect , the steel wall is rotated about the rotation axis, and the welded portion is welded with the welded portion facing upward. Thereby, the welded portion facing upward can be easily welded downward.

A method of welding a steel wall according to a third aspect is the method of welding a steel wall according to the first aspect or the second aspect, in which the rotating shaft is removably attached to the steel wall.

According to the steel wall welding method according to the third aspect , the rotating shaft is detachably attached to the steel wall. Thereby, the rotating shaft can be easily removed from the steel wall after welding the plurality of welded parts.

As explained above, according to the method for welding a steel wall according to the present invention, a plurality of welded parts having different directions can be easily downwardly welded.

FIG. 2 is an elevational view (front view) showing a state in which the steel wall according to one embodiment is installed within the structural surface of the frame. 2 is a sectional view taken along line 2-2 in FIG. 1. FIG. FIG. 2 is an elevational view (front view) showing a state in which the steel wall shown in FIG. 1 is supported by a pair of rotating frames. FIG. 4 is a perspective view showing a joint between a plurality of divided wall bodies that constitute the steel wall shown in FIG. 3; It is a side view showing the state where the steel wall concerning one embodiment was placed on the flat truck. FIG. 4 is a partially enlarged elevational view of FIG. 3 showing the rotating shaft and bracket. FIG. 7 is a plan view (top view) of FIG. 6 showing the rotating shaft and the bracket. FIG. 6 is a side view showing the steel wall shown in FIG. 5 suspended by a chain block. FIG. 9 is a side view showing a state in which the steel wall shown in FIG. 8 is installed on a rotating frame. FIG. 10 is a side view showing a state in which the steel wall shown in FIG. 9 is rotated and laid down.

Hereinafter, a method for welding a steel wall according to an embodiment will be described with reference to the drawings.

(steel wall)
First, the configuration of the steel wall 20 according to this embodiment will be explained. 1 and 2 show a steel wall 20 according to this embodiment. The steel wall 20 is, for example, a load-bearing wall or a seismic wall. This steel wall 20 is arranged within the structural surface of the frame 10. Note that the frame 10 includes a pair of columns 12 and upper and lower beams 14 installed on the pair of columns 12.

The steel wall 20 has a grid-like body 24 and a plurality of plate-like members 32. The lattice-like body 24 has a plurality of vertical members 26 and horizontal members 28. The plurality of vertical members 26 and horizontal members 28 are formed of metal plates such as steel plates. These vertical members 26 and horizontal members 28 are joined in a lattice shape by welding (fillet welding).

The grid body 24 has a plurality of openings 30 surrounded by longitudinal members 26 and cross members 28 . The plurality of openings 30 are formed in a rectangular shape. A plate-like member 32 is provided in a portion of these openings 30 .

The plurality of plate members 32 are formed into a rectangular plate shape using a metal plate such as a steel plate. Each plate-like member 32 is disposed within the opening 30, and its outer peripheral portion is joined to the grid-like body 24 by welding (fillet welding). These plate-like members 32 partially close the plurality of openings 30 .

The plurality of plate-like members 32 are arranged in a checkered pattern (staggered pattern). That is, in the grid-like body 24, the openings 30 in which the plate-like members 32 are provided and the openings 30 in which the plate-like members 32 are not provided are located in the width direction (arrow W direction) and height of the grid-like body 24. They are arranged alternately in the horizontal direction (arrow H direction). Note that the number and arrangement of the plate-like members 32 may be changed as appropriate.

A plurality of wall flanges 34 are provided on the outer peripheral surface of the lattice-like body 24. The plurality of wall-side flanges 34 are overlaid on the plurality of frame-side flanges 16 provided on the inner circumferential surface of the frame 10, and are each bolted together. Thereby, the steel wall 20 is joined to the frame 10.

Note that the joining structure of the steel wall 20 to the frame 10 is not limited to bolt joining, but may be, for example, welding joining.

(Method of welding steel walls)
Next, an example of a method of welding a steel wall will be described.

As shown in FIG. 3, the steel wall 20 has a plurality of (in this embodiment, three) divided wall bodies 22 divided in the width direction from the viewpoint of transportability, lifting capacity, etc. There is. Adjacent dividing walls (dividing pieces) 22 are, for example, welded on site. Thereby, the steel wall 20 is formed.

Here, as shown in FIG. 4, the joint between adjacent dividing wall bodies 22 includes a plurality of welds in different directions. Specifically, a vertical member 26 is provided at an end of one of the adjacent dividing walls 22 (hereinafter referred to as a "joint end"), and a vertical member 26 is provided at the end of the other dividing wall 22. (hereinafter referred to as "joint end") is not provided with a vertical member.

The end of the cross member 28 forming the joint end of the other divided wall body 22 is in a state where it is butted against the surface 26S of the vertical member 26 of one of the divided wall bodies 22, and the both sides (front and back surfaces) 28A, 28B are welded (fillet welded) to the surface 26S of the vertical member 26 from both sides of the steel wall 20 in the height direction (arrow H direction). Further, the end of the plate-like member 32 forming the joint end of the other divided wall 22 is in a state of being abutted against the surface 26S of the vertical member 26 of one divided wall 22, on both sides (front and back sides). ) 32A and 32B are welded (fillet welded) from both sides of the steel wall 20 in the wall thickness direction (arrow T direction).

In this way, at the joint between adjacent dividing walls 22, the welding direction of both sides 28A, 28B of the horizontal member 28 and both sides 32A, 32B of the plate member 32 with respect to the surface 26S of the vertical member 26, that is, the direction of the welded part is determined. It's different. Therefore, below, a method for welding a steel wall according to the present embodiment will be described, taking as an example a method for welding joints between adjacent dividing wall bodies 22.

First, as shown in FIG. 5, a plurality of divided wall bodies 22 are positioned on a flat truck 90 in a lying state, and the cross members 28 on the outer periphery of adjacent divided wall bodies 22 are temporarily welded (temporary welded) to each other. assembly welding). This forms the steel wall 20 in a temporarily assembled state.

Next, the rotating shafts 40 are removably attached to both ends of the temporarily assembled steel wall 20 in the width direction. Specifically, as shown in FIGS. 6 and 7, the rotating shaft 40 has a shaft portion 42 and a pair of flange portions 44, 46. The shaft portion 42 is formed in a cylindrical shape. A pair of flange portions 44 and 46 are provided at both ends of the shaft portion 42 in the axial direction.

The pair of flange portions 44 and 46 are formed into a disk shape. The pair of flange portions 44 and 46 protrudes from both ends of the shaft portion 42 in the axial direction in a brim shape. Furthermore, a bracket 50 is provided on one of the pair of flange portions 44 and 46 .

As shown in FIG. 7, the bracket 50 includes a pair of mounting plates 52 that face each other and a plurality of reinforcing ribs 54 that reinforce the pair of mounting plates 52. A wall-side flange 34 provided on the outer peripheral surface of the steel wall 20 is inserted between the pair of mounting plates 52 . In this state, the pair of mounting plates 52 and wall-side flanges 34 are joined with bolts 56 and nuts 58. Thereby, the rotating shaft 40 extending in the in-plane direction of the steel wall 20 is removably attached to the end portion of the steel wall 20 in the width direction.

Next, as shown in FIGS. 5 and 8, the temporarily assembled steel wall 20 is lifted by a chain block 92 attached to the frame 18 such as a beam, and as shown in FIG. A pair of rotating shafts 40 attached to the rotating shafts 40 are respectively supported by a pair of rotating frames 60.

The pair of rotating frames 60 are arranged on both sides of the temporarily assembled steel wall 20 in the width direction. Each rotating pedestal 60 has a pedestal main body part 62 and a shaft support part 80. The gantry main body 62 includes a pair of columns 64, an upper connecting member 66 and a lower connecting member 68 that connect the pair of columns 64, and a plurality of fall prevention members 70 that prevent the pair of columns 64 from falling. ing.

As shown in FIGS. 6 and 7, the upper connecting member 66 of the gantry main body 62 is provided with a shaft support portion 80 that rotatably supports the shaft portion 42 of the rotating shaft 40. As shown in FIGS. The shaft support section 80 has a bearing base 82 and a pair of stoppers 84.

The bearing base 82 is formed into a plate shape. Further, the bearing base 82 is fixed by welding or the like while overlapping the upper surface 66U of the longitudinally central portion of the upper connecting member 66. The longitudinal center portion of the upper connecting member 66 is reinforced by this bearing base 82 .

The shaft portion 42 of the rotating shaft 40 is placed on the bearing base 82 . At this time, as shown in FIG. 6, the bearing base 82 and the upper connecting member 66 are arranged between the pair of flange parts 44 and 46 of the rotating shaft 40. Thereby, the pair of flange parts 44 and 46 prevent the shaft part 42 from falling off from the bearing base 82.

As shown in FIGS. 7 and 9, a pair of stoppers 84 are arranged on both sides of the upper connecting member 66 in the longitudinal direction with respect to the bearing base 82. As shown in FIGS. The pair of stoppers 84 is formed into a substantially triangular plate shape. Further, the pair of stoppers 84 are fixed by welding or the like in an upright position on the upper surface 66U of the upper connecting member 66. Further, the shaft portion 42 of the rotating shaft 40 is arranged between the pair of stoppers 84 . This pair of stoppers 84 prevents the shaft portion 42 from falling off from the bearing base 82.

The temporarily assembled steel wall 20 supported by the pair of rotating frames 60 is rotated about the pair of rotating shafts 40, and the joint ends of the adjacent divided wall bodies 22 are welded (main welding). .

Specifically, for example, as shown in FIG. 3, the temporarily assembled steel wall 20 is fixed in an upright state using a chain block or the like (not shown). This allows the operator to downwardly weld one of the surfaces 28A and 28B (see FIG. 4) of the horizontal member 28 of the other divided wall body 22 to the surface 26S of the vertical member 26 of one divided wall body 22. can.

In addition, in FIG. 3, by reversing the temporarily assembled steel wall 20 upside down, the worker can move the side of the other divided wall 22 from the surface 26S of the vertical member 26 of one divided wall 22. The other of both surfaces 28A and 28B (see FIG. 4) of the material 28 can be welded downward.

Further, for example, as shown in FIG. 10, the temporarily assembled steel wall 20 is laid down and fixed by supports 86 or the like. As a result, the worker can, from above the temporarily assembled steel wall 20, check the surface 26S of the vertical member 26 of one divided wall 22, the both surfaces 32A of the plate member 32 of the other divided wall 22, 32B (see FIG. 4) can be welded downward.

In addition, in FIG. 10, by reversing the front and back sides of the steel wall 20 in the temporarily assembled state, the worker can inspect the surface of the vertical member 26 of one of the divided wall bodies 22 from above the steel wall 20 in the temporarily assembled state. 26S, the other of both surfaces 32A and 32B of the plate member 32 of the other dividing wall body 22 can be welded downward.

The steel wall 20 is formed by repeating the above procedure and welding (main welding) the joints of adjacent dividing wall bodies 22. Thereafter, the steel wall 20 is installed within the frame 10, as shown in FIGS. 1 and 2.

(effect)
Next, the effects of this embodiment will be explained.

In this embodiment, the welded portions of adjacent dividing wall bodies 22 are welded ( actual welding). Therefore, by rotating the temporarily assembled steel wall 20 around the pair of rotating shafts 40 according to the orientation of the welded parts of the adjacent divided wall bodies 22, a plurality of welded parts having different orientations can be welded downward. be able to.

More specifically, the temporarily assembled steel wall 20 is rotated around the pair of rotating shafts 40, and both surfaces 28A, 28B of the cross member 28 forming the joint end of the other divided wall body 22 and the plate are rotated. The shaped member 32 is welded to the surface 26S of the vertical member 26 forming the joint end of one of the dividing wall bodies 22 with either side 32A or 32B facing upward. Thereby, the operator can easily downwardly weld both surfaces 28A and 28B of the horizontal member 28 and both surfaces 32A and 32B of the plate member 32 to the surface 26S of the vertical member 26. Therefore, it is possible to improve the welding quality and design of the joint between adjacent dividing wall bodies 22.

Here, as another joint structure (comparative example) of adjacent dividing walls 22, vertical members 26 are provided at the joint ends of adjacent dividing walls 22, and the surfaces 26S of these vertical members 26 are overlapped. It is conceivable that welding or bolting may be performed in this state. However, in this case, the two vertical members 26 overlap at the joint between adjacent dividing walls 22, and the vertical members 26 are thicker than other parts, which may deteriorate the design.

On the other hand, in this embodiment, the two vertical members 26 cannot be overlapped at the joint portion of the adjacent dividing wall bodies 22. Therefore, the thickness of the vertical member 26 at the joint portion of the adjacent dividing wall bodies 22 does not become thicker than the vertical member 26 at other parts, so that the design is improved.

Furthermore, in this embodiment, the pair of rotating shafts 40 are detachably attached to the steel wall 20. Thereby, the pair of rotating shafts 40 can be easily removed from the steel wall 20 after welding the plurality of welded parts.

(Modified example)
Next, a modification of the above embodiment will be described.

The steel wall welding method according to the embodiment described above is applied to the joint portions of adjacent dividing wall bodies 22. However, the method of welding a steel wall according to the above embodiment may be applied to, for example, a weld between the vertical members 26 and the horizontal members 28, or a weld between the plate member 32 and the grid member 24. You may.

Further, in the embodiment described above, the steel wall 20 is divided into a plurality of divided wall bodies 22. However, the steel wall does not have to be divided into multiple dividing wall bodies.

Further, in the embodiment described above, a pair of rotating shafts 40 are detachably attached to the steel wall 20. However, the pair of rotating shafts 40 may be provided integrally (non-removably) with the steel wall 20.

Further, the configurations of the rotating pedestal 60 and the rotating shaft 40 in the above embodiment can be changed as appropriate.

Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and the embodiment and various modifications may be used in combination as appropriate, and the gist of the present invention may be It goes without saying that the invention can be implemented in various ways without departing from the scope.

20 Steel wall 40 Rotating shaft

Claims (3)

A method for welding a steel wall having a plurality of welds in different directions, the method comprising:
The steel wall is supported in a horizontally lying state by a rotation shaft extending in the in-plane direction of the steel wall, and supports arranged on both sides of the rotation shaft when the rotation shaft is viewed from the axial direction , A worker standing on top of the manufactured wall welds the welded part,
How to weld steel walls. rotating the steel wall around the rotation axis and welding the welded portion with the welded portion facing upward;
The method of welding a steel wall according to claim 1. The rotating shaft is removably attached to the steel wall.
The method for welding a steel wall according to claim 1 or 2.