JPH11320185A - Manufacture of welding backing metal of square column, and welding backing metal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture an L-shaped backing metal at low cost by bedding a steel plate having the width for arranging plural backing metals at a given curvature of a corner part, and sequentially and parallely cutting the boundary with neighboring backing metals so as to cut off the plural backing metals. SOLUTION: Referring to a corner part shape of a welding object, namely a trapezoidal panel, a steel plate 21 bent at given angle and curvature is set in a manner that inclinations of both faces become equal and an angle δ of one face of the steel plate and a vertical line is half of a bending angle γ. The boundaries with the neighboring backing metals are sequentially and parallely cut at cutting faces 22, to obtain L-shaped backing metals 23. The cutting faces 22 are not vertical to a bending line 24, but form an inclined angle β corresponding to the inclination of the face of the welding trapezoidal panel. The angle of two sides on the cutting face is square like that of the trapezoidal panel, and the bending angle γ of the steel plate is determined in a way to satisfy the above-mentioned condition. Since the plural backing metals are cut off at the cutting faces 22, waste of materials is minimized and production is efficient.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backing used for welding a trapezoidal panel to a through-diaphragm arranged above and below a connecting portion connecting square columns having different external dimensions. It is about money.

[0002]

2. Description of the Related Art The size of one side of a square column or the like is gradually reduced as it goes to the upper floor of a building. At this time, columns having different external dimensions must be connected at a connection portion. . As shown in the perspective view of the connecting portion in FIG. 2, in a connecting portion in which a diaphragm is provided up and down and a panel is provided therebetween, in such a case, a corner whose side length gradually decreases from the lower end toward the upper end. The most basic method is to use a tapered cylindrical panel, that is, a trapezoidal panel 2. In this case, the outer dimensions of the upper end and the lower end of the trapezoid panel 2 correspond to the outer dimensions of the upper and lower square columns 5 and 6, respectively, and the end face of the square column and the end face of the trapezoid panel sandwich the upper and lower diaphragms 3 and 4. Will be. In the drawing, reference numeral 7 denotes a bracket for attaching a beam.

In addition to the above, the outer dimensions of the panel are the same as those of the lower pillar, that is, the larger pillar, and a pillar having a smaller outer dimension is connected to the upper diaphragm. There is also a way to do it. In this case, it is necessary to reinforce the diagonal reinforcement by welding the diagonal reinforcement so as to surround the root of the upper column, or by inserting an inner diaphragm into the upper column. On the other hand, the method using the trapezoidal panel shown in FIG. 2 has a simple structure and is an excellent method without any difficulty in the flow of stress, but has a problem that welding is difficult.

That is, when a trapezoidal panel is used, FIG.
As shown in the cross-sectional view of the panel part, the welding between the trapezoidal panel 2 and the upper and lower diaphragms 3 and 4 is inclined T.
Butt welding of characters. Since welding can be performed only from the outer surface, the backing metal 8 is used, and multi-layer welding is performed by arc welding such as carbon dioxide arc welding or covered arc welding. However, it is extremely difficult to bring the backing metal 8 into close contact with the material to be welded, and welding defects Was likely to occur. A general backing metal is manufactured by bending a flat bar to have a length obtained by dividing the entire circumference of a square column into, for example, two or four parts, and temporarily welding it to a groove portion. If the flat bar is bent normally, the shape is the same in the width direction, while the trapezoidal panel 2 is inclined, so that the trapezoidal panel 2 comes into line contact with the backing metal 8 as shown in FIG. For this reason, if the gap is large, the wire contact portion is melted down during welding work, and welding defects are likely to occur. In particular, a gap is easily formed in a corner portion, and welding defects often occur.

As a backing metal for a welded portion having an arc portion and a straight portion such as the inner surface of a square column, a method of using a corner block of a predetermined shape for the arc portion and using a flat plate for the straight portion therebetween. It is known that such a method is applied as a means for solving the above problem. That is, in this case, the trapezoidal panel is constituted by eight divided members combining a flat plate and a corner block having an angle corresponding to the inclination of the trapezoidal panel. However, this method has a problem that the production of the corner block is complicated, and it takes time to temporarily assemble the backing material divided into eight.

Therefore, the present inventors have previously proposed a backing metal for welding a trapezoidal panel, which comes into contact with the inner surface of the panel and the surface of the diaphragm not in a linear manner but in a planar manner (Japanese Patent Application No. 9-1997). No. 269158). FIG. 3 is a cross-sectional view of a panel using such a backing metal. The welding backing metal 1 has the same surface as the extension of the inner surface 9 of the trapezoidal panel 2 and is parallel to the surfaces of the diaphragms 3 and 4. It has a square cross section having various surfaces. By doing so, the trapezoidal panel 2 and the backing metal 1 come into contact with each other not with a line but with a surface. it can. Such a backing metal may be provided as an annular shape in which the entire periphery of one end of the trapezoidal panel is integrated, or a combination of the entire periphery divided.

Although the above-mentioned application discloses a method for manufacturing such a backing metal, a method for manufacturing an annular backing metal in which the entire circumference of the trapezoidal panel is integrated is as follows. Steel plate with square cross section such as flat bar
It is bent into a U-shape or a U-shape, and for example, four or two of these are combined and welded so as to form a short rectangular cylinder. Next, one end of the cylindrical body is squeezed or expanded by a press device provided with a trapezoidal punch and a die to form a hollow trapezoid. Further, after the press forming, the hollow trapezoidal upper and lower end surfaces are cut and finished so that at least the surface in contact with the diaphragm becomes a horizontal plane. The above application also discloses a method of manufacturing an L-shape in which the entire circumference of a trapezoidal panel is divided. However, when a flat bar or the like is used as a material, the lower side is formed to form an inclined surface simultaneously with bending. Needs to be processed so that the length is longer than the upper side. Therefore, in order to extend the length, it is necessary to restrain both ends and press it, which is a complicated process.

[0008]

As described above, a backing metal having the same surface as the extension of the inner surface of the panel and having a surface parallel to the surface of the diaphragm is suitable for welding a trapezoidal panel. The challenge is how to manufacture at low cost. As will be described later, the shape of the trapezoidal panel differs depending on the position of the pillar in the building, even if the joint is a combination of two types of square columns having different external dimensions. That is, the centers of the upper and lower corner columns may coincide, or one or two sides may coincide, that is, the centers of the corner columns may be shifted. The shape of the trapezoidal panel changes accordingly, and the shape of the backing metal must also change. Therefore, in order to manufacture the above-mentioned hollow trapezoidal shape, it is necessary to prepare a considerably large number of different punch dies. On the other hand, if an L-shaped backing metal corresponding to each corner is used in combination, it is convenient because it is flexible and does not need to have many materials having different dimensions. However, manufacturing an L-shaped backing metal having an inclined surface requires complicated processing as described above. SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a low-cost method for manufacturing an L-shaped backing metal having the same surface as the extension of the inner surface of the trapezoidal panel and having a surface parallel to the surface of the diaphragm. With the goal.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and comprises welding a diaphragm to each end of a square column having a different external dimension, and welding a hollow trapezoidal panel between the diaphragms. A method for manufacturing an L-shaped backing metal having a square cross section having a surface which is the same as the extension of the inner surface of the panel and having a surface parallel to the surface of the diaphragm, for welding a connection part of a square column comprising: After bending a steel sheet having a width in which a plurality of backing bars are arranged at a predetermined corner portion of the backing plate, the boundary between adjacent backing plates is sequentially cut in parallel to form a plurality of backing plates. A method of manufacturing a welding backing metal for a square column, comprising cutting out a metal backing. Here, the cut surface when cutting in parallel is one that intersects the bending line of the bending at an angle other than a right angle corresponding to the inclination of two surfaces to which the backing metal of the panel inner surface is attached, The set position at the time of cutting the bent steel plate may be rotated around a bending line of the bending in accordance with a combination of two inclined surfaces on which a backing metal on the inner surface of the panel is attached. And

[0010] Still further, the present invention relates to a welding backing metal for a square column for welding a trapezoidal hollow panel between diaphragms welded to the ends of respective square columns having different external dimensions. Has one bent portion having a curvature corresponding to the curvature of the corner portion of the panel, both sides of the backing metal constitute a parallel plane, and the bending of the bent portion on a surface extending the both sides. The angle is a right angle, and corresponding to the inclination of both sides sandwiching the corner portion of the panel, the ridge line of the bend of the bent portion is inclined at a predetermined angle and direction from a position perpendicular to the both side surfaces. The feature is the welding backing metal for square columns.

[0011]

FIG. 4 (a) is a perspective view of an entire circumference 1 of a trapezoidal panel 2 of a backing metal according to the manufacturing method of the present invention. The inclination angle of the two surfaces sandwiching the bent portion is equal to the curvature of the inner surface of the corner portion 10, and coincides with the inclination angle of the trapezoidal panel. FIG. 4B is a perspective view showing a state where the panel member is attached to a trapezoidal panel. A groove 11 is formed at each of the upper and lower ends of the panel member, and a backing metal 1 is attached. Since the inner surface of the panel is trapezoidal, the surface on the groove side of the backing metal naturally has the same trapezoidal side surface. FIG. 4
(C) is a perspective view of one backing metal 13 manufactured by the method of the present invention, which is an L-shape attached to one corner of a trapezoidal panel and two sides sandwiching the corner.
In order to weld the entire circumference of one end of the trapezoidal panel, it is necessary to use at least four such backings 13. If the sides are not long enough, it is necessary to add a straight backing between them, which is used only for the sides. The upper and lower backing plates need to be horizontal at least on the side of the diaphragm, but as will be described later, the backing plate according to the manufacturing method of the present invention inevitably has both upper and lower surfaces horizontal.

FIG. 1 is a view for explaining a method of manufacturing a welding backing metal according to the present invention, in which (a) is a front view, (b) is a plan view, and (c) is a side view. In the present invention, not a steel strip that matches the width of the backing metal as in the past as a material,
Use wide steel plates. That is, in the present invention, it is assumed that one material is cut to cut out a plurality of backing metals, and a wide steel plate is used as the material. The material steel plate is first bent at a predetermined angle or curvature at or near the center of the length. In FIG. 1, reference numeral 21 denotes a steel sheet bent in this manner. The curvature of this bend is equal to the curvature of the inner surface of the corner of the trapezoidal panel to be welded on its outer surface. The curvature of the corners of the trapezoidal panel is generally the same from the upper end to the lower end of the trapezoid. For one trapezoidal panel, the backing metal used for the upper welding and the backing metal used for the lower welding Is the same except for the length of the side. In addition, the bending angle γ is larger than a right angle by an amount corresponding to the inclination of the cut surface, and details will be described later.

As shown in FIG. 1, the steel plate 21 bent at a predetermined angle and curvature as described above has the same inclination on both sides, that is, the one side of the steel plate shown in FIG. It is set at a position where the angle δ with respect to the vertical line is half of the bending angle γ. This is sequentially cut in parallel at one cut surface 22 at the boundary with the adjacent backing metal to obtain the desired L-shaped backing metal 23. The cut surface 22 is not perpendicular to a bending line 24 for bending the steel sheet (in this figure, it is shown as an extension of the steel sheet surface on the outer surface side of the bending, but may be a center surface or an inner surface surface). It intersects the bending line at an oblique angle β corresponding to the inclination of the surface of the trapezoidal panel to be formed. It is clear that the cut surface 22 coincides with the horizontal surface when the backing metal is attached to the trapezoidal panel, that is, the surface in contact with the diaphragm. Therefore, the angle of the two sides on the cut surface is a right angle like the trapezoidal panel, and the bending angle γ of the steel plate of the material is determined so as to satisfy this.
As described above, according to the manufacturing method of the present invention, by setting the angle β between the cut surface 22 and the bending line 24 of the steel plate to a predetermined value, the plane of the backing metal is formed on the inner surface of the trapezoidal panel including the corners. Of course, the sides of the backing metal, including the corners, will automatically match the sides of the diaphragm, as well as the perfect match.

According to the present invention, a large number of backing plates of the same size can be manufactured from one bent steel plate by the method of sequentially cutting in parallel. FIG. 1 shows the case of six pieces, but actually a larger number is preferable in terms of material yield and work efficiency. The portion 25 in FIG. 1 may be cut such that the end face of the backing metal is perpendicular to the length direction as described above, or on the premise that it is cut to the length of a side necessary for use. This portion may be provided as it is without being cut off.

In the present invention, the cutting means is not particularly limited. Since it is cut at one cutting surface, for example, a bent steel plate is set at a predetermined inclination angle,
It is also possible to cut in a band sawing machine so as to make a round slice sequentially. Efficiently preferred is a method in which the torch is fed in one direction while cutting the torch up and down along the steel plate, using a gas cutting machine or a plasma cutting machine. In this case, the angle of the torch may be changed in the plane including the torch feed direction so that the angle of the torch with respect to the surface of the steel sheet is as large as possible. Such an operation can be performed by a simple mechanism by manufacturing a scanning cutting device dedicated to the manufacturing method of the present invention. However, even when a general-purpose arc welding robot is equipped with a cutting torch instead of a welding torch. It can be done easily.

FIG. 1 shows a method of manufacturing a backing metal used when two sides sandwiching a corner of a trapezoidal panel have the same inclination angle. However, the inclination angles of these two sides are not always equal. . In other words, even if the connection part is a combination of two types of square columns having different external dimensions, the shape of the trapezoidal panel differs depending on the position of the pillar in the building. That is, FIG.
A trapezoidal panel in which four surfaces are similarly inclined as shown in the side view of (a) and the plan view of (d) is used for the pillar inside the building, and the pillar on the outer surface of the building is shown in FIG. A trapezoidal panel having three inclined surfaces as shown in the side view of FIG. 5B and the plan view of FIG. 5E is used, and the pillar at the corner of the building is the side view of FIG. 5C and the plan view of FIG. A trapezoidal panel having two inclined surfaces as shown in the figure is used. Therefore, it is necessary to use a welding backing metal for performing welding of one connection portion, in which the inclination angle of each side is different depending on the shape of the trapezoidal panel. As described above, in each of the trapezoidal panels, the curvature of the corner portion 10 is generally constant with no change in the vertical direction on the inner and outer surfaces. It is therefore not a trapezoid in the exact sense as far as this is concerned.

FIGS. 6A and 6B show a method of manufacturing a backing plate in which one surface of a trapezoidal panel is inclined and the other surface is used for a vertical portion, wherein FIG. 6A is a front view, and FIG. Figure, (c)
Is a side view. In the trapezoidal panel used for the same combination of the square columns, the curvature of the corner portion 10 is the same even if the combination of the inclinations of the side surfaces is changed as shown in FIG. Compared to the case of FIG. 1, the position of the steel plate 21 to be cut is defined by the bending line 2 of the bending.
4 until one surface is vertical, ie, FIG.
(C) is rotated until δ becomes 0 °, and then the boundary between the adjacent backing metal is cut in parallel with one cut surface 22 in the same manner as in the previous case, so that the desired L-shaped back surface is obtained. Deposit 26
Is obtained. Also in this case, the cut surface 22 is not perpendicular to the bending line 24 for bending the steel plate, but intersects at an oblique angle α corresponding to the inclination of the surface of the trapezoidal panel to be welded. The cut surface 22 also coincides with the horizontal plane when the backing metal is attached to the trapezoidal panel, that is, the surface in contact with the diaphragm, as in the case of FIG. Accordingly, the angle of the two sides on the cut surface is the same as the right angle, but it is intuitively clear that the bending angle of the steel plate may be set to the right angle in the case of FIG.

As described above, in the method of manufacturing a backing metal according to the present invention, a steel plate bent at a predetermined angle and a curvature is set at a position where a rotation angle about a bending line becomes an axis, and a predetermined inclination angle is set. The cutting method is performed in such a manner that the bending angle of the steel sheet and the inclination angle in the cutting are calculated as follows. The inclination angle of both sides sandwiching the corner portion is the same as in the case of the trapezoidal panel shown in FIGS. 5 (a) and 5 (d).
As shown in FIGS. 5B, 5C, 5E, and 5F, one is inclined at an angle, and the other is at 90 degrees, that is, vertical. (E) There are cases where the surfaces on both sides are inclined, such as the lower two corners, and the inclination angles are different. Of these three cases, the case where the second one surface is vertical is the simplest, and will be described first.

FIG. 7 is a perspective view of one cut-out backing metal in this case, which is schematically shown for convenience, that is, the corners are not arcuate but bent only at the bending line 31. , And the thickness of the material is ignored. Here, 32 is a plane inclined at an angle α, and 33 is a vertical plane. As can be seen in this figure, the bending line 31 and the surface 3
The angles of the lower sides 34, 35 of 2, 33 are 90 degrees and α, respectively. Therefore, in cutting, as shown in FIG. 6, one side of the bent steel plate is set to be vertical, and the angle between the bending line and the cut surface is set to α, that is, the cut is made. The inclination of the surface from the vertical is 90 ° -α
What is necessary is just to set the cutting means, such as a cutting torch, so that it may become. In FIG. 7, if a plane 36 perpendicular to the bending line 31 is taken, this plane corresponds to the end face of the bent steel plate shown in FIG. 6C. Here, even if the bottom surface is rotated around the side 34 to the position of the surface 36, it is clear that the angle of the corner on the rotated surface is also a right angle. This means that the bending angle of the steel plate may be a right angle as described above.

FIG. 8 is a perspective view schematically showing the case where the inclination angles of both sides sandwiching the corner portion are both α, which are schematically shown as in the case of FIG. I have. In FIG. 8, the subscripts 1 and ₂ such as α ₁ and α ₂ are provided for the case where the inclination angles of both sides sandwiching the corner portion described later are different, and it is assumed that there is no distinction at this time. I do. When the inclination angles of the surfaces on both sides sandwiching the corner portion are equal, the bending line 41 and the surface 42,
Obviously, the angle of each of 43 with the lower sides 44 and 45 is equal, but not the same as the inclination angle α of the surface. Therefore, this is set to θ as shown in the figure. When an auxiliary line is drawn as shown by a broken line in this figure and the lengths a and b of the line segment are determined, tan θ = b / a and cos α = a / b
A and b are eliminated, and tan θ = 1 /
The relationship cos α is derived.

Further, as shown in FIG. 8, when the inclination angle of the bending line 41 to be determined is β and the lengths of the line segments c and d are determined, sin β = c / d. On the other hand, cos θ = a / d
Since there is a relationship of tan α = c / a, if these expressions are arranged, a relational expression of sin β = tan α · cos θ is derived. For example, when α = 70 °, that is, when the inclination of the trapezoid panel surface from the vertical is 20 °, θ = 71.1 °, and β = 62.8 °. Therefore, in cutting, as shown in FIG. 1, the bent steel plate is set so that the inclination of both surfaces is equal, and the angle between the bending line and the cut surface is β, That is, the cutting means may be set so that the inclination of the cut surface from the vertical is 90 ° -β. Depending on the specifications of the cutting device, the cutting angle may be set by the angle θ between the bending line on the surface of the steel plate and the cut surface, but it is natural that the cutting method may be used.

The bending angle of the steel plate to be cut is
In FIG. 8, taking a plane 46 perpendicular to the bending line 41, this plane corresponds to the end face of the bent steel plate shown in FIG. 1 (c). Here, with respect to the angle obtained by projecting the right angle of the corner of the bottom surface in FIG. 8 to this surface 46, that is, the bending angle γ of the steel plate, tan (γ / 2) = 1 / cos (90 ° −
β) = 1 / sin β holds. For example, if β = 62.8 ° in the above example, γ = 96.7 °, and by thus obliquely cutting a steel plate bent at an angle larger than a right angle, the angle at the cut surface becomes a right angle.

Further, when the surfaces on both sides sandwiching the corner portion are inclined and the inclination angles are different, it is necessary to find not only the inclination angle of the cut surface but also the set position at the time of cutting the bent steel plate. In this case, the inclination angle of the cut surface can be calculated by using the angles and lengths distinguished by adding subscripts 1 and ₂ such as α ₁ and α ₂ and a ₁ and a ₂ in FIG. The detailed calculation procedure is not described again since it can be easily understood as an extension. The outline is described below. First, the inclination angles of one and the other surfaces are α ₁ and α ₂ , respectively.
If the angles between the bending line 41 and the lower sides 44 and 45 of the one and the other surfaces are respectively θ ₁ and θ ₂ ,
The following two equations hold. tan θ ₁ = (1 / cos α ₁ ) · (tan α ₂ / tan α ₁ ) tan θ ₂ = (1 / cos α ₂ ) · (tan α ₁ / tan α ₂ )

Further, the inclination angle β of the bending line 41 is calculated by the same calculation procedure as when the inclination angles of both sides sandwiching the corner portion are equal, and sin β = tan α ₁ · cos θ ₂ = tan α ₂ ·
cosθ ₁ Therefore, the cutting means may be set so that the inclination angle of the bending line becomes β obtained as described above, that is, the inclination of the cut surface from the vertical becomes 90 ° -β. It should be noted that, depending on the specifications of the device, it may be set by θ ₁ and θ ₂ as described above.
In addition, the bending angle γ of the steel sheet to be cut is exactly the same as when the inclination angles of both sides sandwiching the corner are equal, and
n (γ / 2) = 1 / sin β.

Next, as to the set position at the time of cutting the bent steel sheet, as will be understood from the description of the case where the two surfaces of the backing metal have the same inclination and the case where one surface is vertical, In accordance with the combination of the inclinations of the two surfaces of the gold, the rotation is made around the bending line of the bending. In FIG. 8, if an angle λ is taken in the right-angled triangle on the bottom surface, tan λ =
a ₂ / a ₁ , tan α ₁ = c / a ₁ and tan
According to the relationship α ₂ = c / a ₂ , tan λ = tan α ₁ / ta
n α ₂ Therefore, the steel plate of the material may be set at a position rotated about the bending line by the angle γ obtained in this way from a position where one surface is vertical. However, this angle γ is an angle on the bottom surface of FIG. 8, that is, on the cut surface of the steel plate. For example, when the inclination angles α ₁ and α _{2 of} both surfaces are equal, λ = 45 °. The rotation angle δ at the end face of the steel sheet shown in FIG. 1 (c) is obtained as tan δ = tan λ / sin β using the equation for previously calculating the bending angle γ of the steel sheet.

The above description is for the case where the two surfaces sandwiching the corner of the trapezoidal panel in which one backing metal is used, at least one of which is not vertical. Therefore, when manufacturing the backing metal, the cut surface intersects the bending line of the bending process of the material steel plate at an angle other than a right angle corresponding to the inclination of the inner surface of the trapezoidal panel. However, the manufacturing method of the present invention is not limited to the above case, and can be applied to a case where both surfaces sandwiching the corner of the trapezoidal panel are both vertical. In this case, the cut surface is perpendicular to both surfaces of the backing metal, and the cut surface is naturally perpendicular to the bending line of the bending process of the steel plate. Since the backing metal having such a shape can be manufactured by simply bending the flat bar, it is not necessary to manufacture the backing metal by the method of the present invention. However, as shown in FIG. 5, such a material may be required as a backing metal for one corner of one connection part, so that a material obtained by bending a steel plate at the same curvature is used. It is preferable in terms of work efficiency to manufacture as a set together with a backing metal having an inclined surface used for the same connection part.

As described above, the welding backing metal manufactured by the method of the present invention can accurately produce a completely ideal backing metal for welding between the hollow trapezoidal panel and the diaphragm. In particular, in the manufacturing method of the present invention, both side surfaces of the backing metal automatically constitute parallel planes as cut surfaces, and can be completely adhered to the diaphragm during use. In the conventional manufacturing method, in order to make the side surface of the backing metal a predetermined plane, it is necessary to perform bending and then cutting or grinding with a grinder or the like. Although a method of processing before bending so that the side surface becomes flat after bending is also conceivable, there is a problem that it is difficult to form a curved surface in a bent portion. In the case of cutting or grinding after bending as described above, it is usual to process only one side on the side that comes into contact with the diaphragm in order to reduce labor. On the other hand, the backing metal manufactured by the method of the present invention has an advantage that both sides are automatically flattened, so that either side can be the diaphragm side, and the flexibility is effective.

As described above, the backing metal according to the manufacturing method of the present invention has a curvature corresponding to the curvature of the corner of the panel.
That is, the curvature of the outer surface of the bend has one bent portion which is the same as the curvature of the inner surface of the panel, the bending angle is a right angle on a surface extending both side surfaces, that is, on a horizontal plane such as a panel, The back surface for welding the diaphragm and trapezoid panel such that the bending line and ridge line of the bending part are inclined at a predetermined angle and direction from a position perpendicular to the horizontal plane according to the inclination of both sides sandwiching the corner part While fulfilling the required conditions exactly as a payment,
It has a feature that cannot be obtained by the conventional manufacturing method in which both side surfaces of the backing metal constitute a completely parallel plane.

[0029]

According to the method for manufacturing a welded backing metal of the present invention, a backing metal having an inner surface of a groove portion of a trapezoidal panel and a surface exactly along the diaphragm surface is ideal for welding a trapezoidal panel to a diaphragm. Can be produced efficiently and economically. That is, since a steel plate bent at a predetermined angle and curvature is used as a material, and a plurality of backing plates are cut out by cutting a boundary between adjacent backing plates in parallel in order, waste of the material can be minimized. Also, if a bent steel plate is prepared as a material, it can be immediately made into a backing metal product with a relatively simple cutting operation, so that material stock can be rationalized and efficient production can be performed.

[Brief description of the drawings]

FIG. 1 is a view for explaining a method of manufacturing a welding backing metal according to the present invention, wherein (a) is a front view, (b) is a plan view, and (c) is a side view.

FIG. 2 is a diagram showing a connection portion formed by trapezoidal panels;

FIG. 3 is a sectional view of a panel using a backing metal according to the present invention.

4 (a) is a perspective view showing the entire circumference of a trapezoidal panel of a welding backing metal according to the present invention, FIG. 4 (b) is a perspective view showing a state of being attached to the trapezoidal panel, and FIG. 4 (c) is a perspective view of one backing metal.

FIGS. 5A and 5B show various shapes of a trapezoidal panel.
(C) Side view and (d), (e), (f) plan views

6 (a) is a front view, FIG. 6 (b) is a plan view, and FIG. 6 (c) is a side view.

FIG. 7 is a schematic perspective view illustrating an angle relationship in the method for manufacturing a welding backing metal according to the present invention.

FIG. 8 is a schematic perspective view illustrating an angle relationship in the method for manufacturing a welded backing metal according to the present invention.

FIG. 9 is a cross-sectional view of a panel portion showing a usage state of a conventional welding backing metal.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 backing metal 2 trapezoidal panel 3, 4 diaphragm 5, hexagonal column 7 bracket portion 8 backing metal (background) 9 inner surface of trapezoidal panel 10 corner portion 11 groove 12 bent portion 13 backing metal 21 bent steel plate 22 Cut surface 23 Backing metal 24 Bending line 26 Backing metal 31 Bending line 32, 33 surface 34, 35 Lower side 36 Surface perpendicular to bending line 41 Bending line 42, 43 surface 44, 45 Lower side 46 Surface perpendicular to bending line

Claims (4)

[Claims] 1. A panel inner surface for welding a joint of a square column formed by welding a diaphragm to each end of a square column having a different external dimension and welding a hollow trapezoidal panel between the diaphragms. Of a square cross section having the same plane as the extension of the diaphragm and having a plane parallel to the plane of the diaphragm.
In the manufacturing method of the letter-shaped backing metal, after bending a steel sheet having a width in which a plurality of backing metals are arranged, at a predetermined corner portion of the backing metal, a boundary between adjacent backing metals is sequentially formed. A method for manufacturing a welding backing metal for a square column, wherein a plurality of backing metals are cut out in parallel with the above. 2. A cut surface for cutting in parallel with the bending line of the bending process at an angle other than a right angle corresponding to an inclination of two surfaces to which a backing metal on the inner surface of the panel is attached. The method for producing a square column welding backing metal according to claim 1, wherein: 3. A set position at the time of cutting the bent steel plate corresponds to a combination of inclinations of two surfaces to which a backing metal on the inner surface of the panel is attached, and is rotated about a bending line of the bending process as an axis. 3. The method according to claim 1, wherein the backing metal is welded on a square column. 4. A backing metal for a square column for welding a hollow trapezoidal panel between diaphragms welded to the ends of each of the square columns having different external dimensions, wherein the backing metal is made of the panel. It has one bent portion with a curvature corresponding to the curvature of the corner portion, both sides of the backing metal constitute a parallel plane, and the bending angle of the bent portion on a surface extending the both sides is a right angle. And the ridge line of the bent portion of the bent portion is inclined at a predetermined angle and direction from a position perpendicular to the both side surfaces, corresponding to the inclination of both surfaces sandwiching the corner portion of the panel. Column welding backing.