JPS6049075B2 - Manufacturing method for closed section columns - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing closed cross-section columns used as structural materials for buildings, bridges, etc.

Taking architecture as an example, closed-section columns are much more commonly used than H-shaped structural members in the field of high-rise construction because they are effective against loads from four directions.

By the way, a closed cross-section column is manufactured by welding together the four corners of four plates made of flange material and web material, but when using this as a structural material, the part where the cross beam is attached to the closed cross-section column ni, the load of the horizontal beam is 1, 1, 3, 8, 8, 1, 01
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It is necessary to provide a diaphragm inside the lunar $6ψ-faced pillar.

This diaphragm is
Generally, it is attached by welding at two points, upper and lower, corresponding to the flange part. Therefore, manufacturing a structural member in which a diaphragm is welded into a closed cross-section column is problematic in terms of quality and cost. Conventionally, the manufacturing method for this closed cross-section column with a diaphragm involves assembling three of the four plates into a U-shape, inserting the diaphragm from above, and then welding these three plates to the three outer sides of the diaphragm. The remaining plate was placed in the remaining opening, the joint between the plate and the diaphragm was placed vertically, and the joint was welded by consumable nozzle electroslag welding.

Another manufacturing method is to
The previous plate material was welded to one side, and the other two opposing sides and the plate material were simultaneously welded using a consumable nozzle type electroslag.

However, the conventional method has the following drawbacks. (b) When performing consumable nozzle electroslag welding, a backing material is installed to form a sealed space between the diaphragm and the plate to form a molten pool, but the dimensional accuracy (plate thickness) of the backing material is , width, length) or installation accuracy (adhesion with the plate material, overlap distance with the diaphragm), it may fall off or lack penetration.

In addition, electroslag welding has a heat input of 150KJ to 500KJ.
KJ is large, the crystal grains of the weld metal become coarse, and brittleness decreases, so it is difficult to apply to high grade steels of SM5B or higher. Furthermore, as mentioned above, since the amount of heat input is high, welding distortion is likely to occur and correction thereof takes a long time. (b) In the connection between the diaphragm and the plate material, parts other than electroslag welding are often constructed by full penetration welding with ■-shaped groove or K-shaped groove, and after welding, the plate material has a tendency to have cracks, lamellar tears, etc. Material defects may occur.

(c) The part where the consumable nozzle type electrowelding is performed is commonly called "blind CES", and it is difficult to see visually and welding is difficult.

In particular, it is difficult to perform ultrasonic flaw detection after welding, which tends to promote the occurrence of welding defects and the oversight of defects. (d) If the number of diaphragms is large, it takes a long time to process the beveling. The present invention solves the problems of the prior art described above and provides a method for manufacturing a closed cross-section column that can be easily visually welded without causing defects in the base material. After arranging the diaphragm in this opening with the end thereof facing upward and a portion of the diaphragm protruding outward, the diaphragm and the end of the closed cross-section block body are welded downward, and the bead surface of the diaphragm is welded to the end thereof. Then, the end of the other closed cross-section block body is arranged so as to coincide with the upper surface of the diaphragm, so that the end of the closed cross-section block body and the end of the other closed cross-section block body are connected. The present invention is characterized in that a welding gap is formed in the welding device, and the gap is welded.

Next, examples of the present invention will be described with reference to the drawings.

Fig. 1 is a perspective view of the diaphragm 2 arranged on the closed cross-section block body 1, Fig. 2 is a perspective view of the diaphragm 2 welded to the closed cross-section block body 1, and Fig. 3 is a part of Fig. 2. The explanatory diagrams shown in cross section, Figures 4 to 8, are related to this invention)
2 is a cross-sectional view showing the manufacturing sequence of a closed cross-section column.

As shown in Figures 1 to 5, four plates 1a, 1b,
The four corners of 1c and 1d are welded to form a closed cross-section block body 1, and a diaphragm 2 is inserted into the open end 3 of the block body 1.

The diaphragm 2 is supported by a backing metal 4 provided inside the open end 3, and is arranged with welding grooves Tgl provided on four circumferences. Then, the backing metal 4 is welded to the position of the plate material where the diaphragm 2 protrudes by Tg2. After that, the diaphragm 2 and the four circumferences of the plate materials 1a, 1b, 1c, and 1d are welded downward 5.
Weld by. Next, as shown in FIG. 6, a backing metal 6 is attached to four circumferences of the upper surface of the diaphragm 2 by welding 6''.

Thereafter, as shown in FIG. 7, the open end 8 of another closed cross-section block body 7 is fitted using the backing metal 6 as a guide. In that case, the end 7'' of the other closed cross-section block body 7 is arranged so as to coincide with the upper surface of the diaphragm 2, and a gap Tg2 is provided. In this state, while welding is in progress, a spacer is inserted into the other unwelded part to form a gap Tg2.In addition, when the other closed cross-section block body 7 is fitted to the backing metal 6 while lying on its side, The spacer becomes unnecessary.Then, as shown in FIG. 8, the gap Tg2 is welded 9.

The welding 9 may be performed by horizontal horizontal welding, or by rotating the closed cross-section block bodies 1 and 7 in order so as to perform downward welding when the closed cross-section block bodies 1 and 7 are laid down horizontally. . In FIGS. 6 and 7, the backing metal 6 is first attached to the diaphragm 2, but as shown in FIG. The backing metal 10 may be attached onto the diaphragm 2.

In this case, the disadvantage that the open end 8 of the other closed cross-section block body 7 shown in FIG. 7 is difficult to fit into the backing metal 6 is eliminated. The welding used in this invention includes carbon dioxide arc welding, MIG welding, shielded arc welding, and submerged arc welding other than electrowelding. As described above, according to the present invention, welding is very easy to perform, and welding other than electroslag welding is used, so the above-mentioned problems caused by electroslag welding are solved, and the diaphragm can be of V-shape or K-shape. There is no need to perform bevel processing, welding work can be visually observed, so defects are less likely to occur, and all welding can be done downwards, making welding easier and easier to automate. effect is brought about.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a diaphragm arranged on a closed cross-section block body, Fig. 2 is a perspective view showing a state in which the diaphragm is welded to a closed cross-section block body, and Fig. 3 is an explanation showing a partial cross section of Fig. 2. 4 to 8 are sectional views showing the manufacturing sequence of the closed cross-section column according to the present invention, and FIG. 9 is another example showing the manner in which the backing metal is attached to the closed cross-section block body. In the drawings, 1, 7...... Closed cross section block body, 2... Diaphragm, 3, 8... Open end, 4, 6, 10... Back side. Cash, 5, 9...
···welding.

Claims (1)

[Claims] 1. After placing the diaphragm in the opening with the open end of the closed cross-section block facing upward so that a portion of the diaphragm protrudes outward, the diaphragm and the end of the closed cross-section block are welded together by downward welding. and the bead surface thereof is aligned with the end surface, and then the end of another closed cross section block body is arranged so as to coincide with the upper surface of the diaphragm, and the end of the closed cross section block body and the other closed cross section block body are aligned. A method for manufacturing a closed cross-section column, characterized by forming a welding gap between the ends of a cross-section block body, and welding the gap.