JPH05239861A - Welding method for square steel pipe column and h-section steel beam - Google Patents

Abstract

PURPOSE:To make it possible to perform welding having high structural reliability without providing scallop at a weld of through diaphragm of square steel pipe column and a rolled H-section steel beam flange. CONSTITUTION:At a weld of a rolled H-section steel beam A with respect to a through diaphragm 3 of a square steel pipe column B, an edge preparation for welding is applied to the beam A, wherein the flange of the beam A has a length equal to or slightly smaller than the sum of the length of the diaphragm 3 protruding from the column B and a design root interval and has a cut angle equal to a design groove angle theta. Thereafter a backing strip (c) is attached to the underside of the beveled portions of the diaphragm 3 and the flange of the beam and then the beveled portions are welded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for welding a rectangular steel pipe column and an H-shaped steel beam.

[0002]

2. Description of the Related Art In conventional welding of this type, as shown in FIG. 10, a long arc-shaped scallop 1 is cut in the web of a rolled H-shaped steel beam A, and the H-shaped steel beam facing the scallop 1 is cut. The backing metal 4 was welded to each lower surface between the flange 2 and the leading end of the through diaphragm 3 of the rectangular steel pipe pillar B.

[0003]

According to the above-mentioned conventional welding method, the welded portion w between the flange 2 of the rolled H-shaped steel beam A and the through diaphragm 3 allows the backing metal 4 required for welding to pass therethrough. In addition to the fact that the scallop 1 having a long arc shape is omitted, not only the machining of the scallop 1 is complicated, but also when a structural experiment is carried out, the member is broken from the tip corner portion 1a of the scallop 1 due to stress concentration. So it was a structural problem.

Further, since the through diaphragm 3 is deformed inward by the welding shrinkage of the flange 5 of the rectangular steel tube column and the weld portion 6 of the through diaphragm 3, the through diaphragm 3 and the beam flange 2 of the rolled H-shaped steel beam A are welded. Misalignment δ (see FIG. 10) often occurred in the part w ′. Therefore, there is a problem that the backing plate 4 is obliquely attached, and a welding defect is likely to occur in the first layer portion (root portion).

The present invention has been proposed in view of the above problems of the prior art, and its object is to provide a scallop at a welded portion between a through diaphragm of a rectangular steel tube column and a rolled H-shaped steel beam flange. The point is to provide a method of welding a rectangular steel tube column and an H-shaped steel beam, which is structurally highly reliable, without providing it.

[0006]

In order to achieve the above object, according to the method of welding a rectangular steel pipe column and an H-shaped steel beam according to the present invention, a welded portion of the H-shaped steel beam to the through diaphragm of the rectangular steel pipe column is welded. In the flange welded portion of the beam having a cutting angle equal to or slightly smaller than the added value of the projecting length from the steel pipe column of the diaphragm and the design route interval, and having a cutting angle equal to the design groove angle. The groove is worked, then a backing plate is attached to the lower surface of the portion of the beam flange located at the groove processed portion, and then the groove is welded.

According to a second aspect of the invention, a seal bead is provided between the backing plate and the through diaphragm.
According to a third aspect of the present invention, after the pair of backing metals adjacent to each other are attached to the lower surfaces of the through diaphragm and the beam flange located at the groove processing portion, the groove portions are welded.

[0008]

According to the present invention, as described above, since the scallop is not provided on the H-shaped steel beam at the welded portion between the through diaphragm of the rectangular steel tube column and the H-shaped steel beam flange, the cross section of the H-shaped steel joint is obtained. Defects are reduced. Further, since the backing metal is attached to the lower surface of the through-diaphragm and the H-shaped steel beam flange which is located at the groove processing portion, the backing metal prevents the weld from melting through and eliminates the welding of the corners. , Welding work is easily performed.

According to the invention of claim 2, the seal bead between the backing plate and the through-diaphragm of the rectangular steel tube column prevents the burn-through of the welding. According to the invention of claim 3, the through diaphragm of the rectangular steel pipe column and the H
After attaching a pair of backing plates adjacent to each other to the lower surface of the shaped steel beam located at the groove-processed portion, welding of the groove portion is carried out to prevent burn-through of the weld.

[0010]

The present invention will be described below with reference to the illustrated embodiments. FIG. 1 shows a through diaphragm 3 and a rolling H of a rectangular steel pipe column B.
Reference numeral 11 represents an example of a rolled H-shaped steel beam web in which the misalignment h of the shaped steel beam A is large and there is no fear that the backing metal will melt down.
As shown in FIG. 8, 12 is a web fillet, 13 is a flange, and the groove portion of the flange welded portion is the sum of the projecting dimension a from the flange 5 of the rectangular steel tube column B of the diaphragm 3 and the design interval g. Equal or 2 mm from this
The dimension L ′ is slightly smaller. The cutting angle θ of the flange 13 corresponds to the designed groove angle.

On the lower surface of the flange 13 of the H-shaped steel beam A, which faces the through diaphragm 3 of the rectangular steel tube column B,
A single backing metal C is welded so that its tip is in contact with the through diaphragm 3. If the misalignment h is small and there is a risk that the backing metal C will melt down by welding, the welded part is formed by performing the above-described seal bead S (burn through prevention welding) for preventing burn through.

FIG. 2 shows an embodiment in which there is no misalignment h, which is disclosed in Japanese Utility Model Publication No. 59-42237, which is proposed by the inventors of the present invention, in a welded portion which is groove-processed as described above. A backing plate d shown in FIG. 5 which is substantially the same as that shown in FIG. 5 is attached to the free end of the diaphragm 3 adjacent to the backing plate c. FIG. 2 shows the mounting state of the backing plates c and d. After mounting the backing plates c and d, welding w'of the groove portion is performed.

When there is no difference between the through diaphragm 3 and the rolled H-shaped steel beam flange, a backing metal e shown in FIG. 7 in which the backing metal c and the backing metal d are integrated is used. Good.

[0014]

According to the present invention, as described above, after the backing plate is attached to the lower surface located at the groove processed portion of the H-shaped steel beam flange welded portion to the through diaphragm of the rectangular steel tube column, the groove portion is attached. By carrying out the welding, the scallop is not provided, therefore the cross-section loss is reduced and the welding is carried out well, and the structural performance is greatly improved.

Further, even if there is a misalignment that is likely to occur in the welded portion of the through diaphragm and the H-shaped steel flange, it is possible to prevent welding defects that are likely to occur in the first layer portion (root portion), and no entry corner portion is provided. Since it is possible to perform welding with, it is possible to perform highly reliable and favorable welding work. According to the invention of claim 2, by providing a seal bead between the backing plate and the through diaphragm, the through diaphragm and the H
When there is little misalignment of the shaped steel beam flange and there is a risk that the backing plate will burn through due to welding, the seal bead prevents this.

According to the invention of claim 3, on the lower surface located at the grooved portion of the through diaphragm and the beam flange,
After attaching the pair of backing bars adjacent to each other, the groove portions are welded to prevent the backing bars from being burned down by welding.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an implementation state of an embodiment of a welding method of a rectangular steel tube column and an H-shaped steel beam according to the present invention.

FIG. 2 is a vertical sectional view showing an implementation situation of another embodiment of the method of the present invention.

FIG. 3 is a front view of a groove processed portion of the H-shaped steel beam flange welded portion.

FIG. 4 is a side view of FIG.

FIG. 5 is a perspective view showing an example of a backing plate.

FIG. 6 is a perspective view showing another example of a backing plate.

FIG. 7 is a perspective view showing still another example of a backing plate.

FIG. 8 is a front view showing a welded portion of a conventional square steel tube column and an H-shaped steel beam.

9 is an enlarged view of part A in FIG.

FIG. 10 is a vertical cross-sectional view showing a misalignment between a through diaphragm and a rolled H-shaped steel beam flange and a backing plate obliquely attached.

[Explanation of symbols]

 A Rolled H-shaped steel beam B Rectangular steel tube column C Backing plate 1 Scallop 2 Beam flange 3 Through diaphragm 4 Backing plate 5 Column flange 6 Welded portion between column flange and through diaphragm 11 Rolled H-shaped steel beam 12 Beam web fillet 13 Beam flange w'Welding portion of through diaphragm and beam flange c Backing metal d Backing metal

Claims (3)

[Claims] 1. A welded portion of an H-shaped steel beam with respect to a through diaphragm of a rectangular steel pipe column has a length equal to or slightly smaller than a sum of a projecting length of the diaphragm from the steel pipe column and a design route interval. And, the groove welded portion of the beam having the designed groove angle is subjected to groove processing, then a backing plate is attached to the lower surface of the portion of the beam flange located at the groove processed portion, and then the groove portion is welded. A method for welding a rectangular steel pipe column and an H-shaped steel beam, characterized in that 2. The method for welding a square steel tubular column and an H-shaped steel beam according to claim 1, wherein a seal bead for preventing burn-through is provided between the backing plate and the through diaphragm. 3. The square steel pipe according to claim 1, wherein after the pair of backing metals adjacent to each other are attached to the lower surfaces of the through-diaphragm and the beam flange located at the groove-processed portion, the groove portions are welded. Welding method for columns and H-shaped steel beams.