JP2601720B2 - Diaphragm mounting method for steel box columns - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for mounting a diaphragm in a core portion where a steel box column and a girder cross each other.

[Prior Art] Generally, in a steel structure of a building, as shown in FIG. 3, large beams b and c such as H-shaped are attached to the outer wall of a steel box column a, and the steel box column a sandwiched between the girders.
Since there is no diaphragm (stiffener) corresponding to the girder web in the core portion d, the bending strength was calculated by ignoring the girder web in design, and the amount of steel used increased, which was uneconomical.

Further, diaphragms e and f corresponding to the flanges are attached above and below the core portion d so as to correspond to the flanges of the girders b and c.
As shown in FIG. 4, since the electroslag welding g, h (the other two opposite sides are arc welding i, j) are performed on the inner wall of the core part d on the side of the large beams b, c, the heat input amount is increased. Changes in the material (softening,
Coarsening, etc.).

[Problems to be Solved by the Invention] The present invention has been made to solve such problems of the prior art, and a diaphragm corresponding to a web is mounted in a core portion, and welding of the diaphragm corresponding to a flange is performed by a steel box. An object of the present invention is to provide a method of attaching a diaphragm to a steel box column in which the amount of heat input to the column is not increased.

[Means for Solving the Problems] As means for solving this technical problem, the present invention provides a steel box column to which a girder is attached, in a core portion thereof, the inner wall surface of the core portion corresponds to the web of the girder. The diaphragm is welded first, and then the diaphragm corresponding to the flange of the girder, which is divided into two in the diagonal direction, is brought into contact with the upper and lower ends of the diaphragm corresponding to the web, and the inner wall of the core portion is formed. The gist of the invention is a method of attaching the two divided diaphragms by arc welding and electroslag welding along the diagonal dividing line.

[Operation] Since the diaphragm corresponding to the web is provided in the core of the steel box column, the bending strength can be calculated with the beam web also being effective, and the diaphragm corresponding to the flange is bisected in the diagonal direction. The inner wall of the core portion is fixed by arc welding with a small heat input and integrated by electroslag welding with a large heat input only along the dividing line. Can be prevented.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a steel box column, and large beams 2, 3 of H shape or the like are attached to the left and right outer walls by welding. Reference numerals 4 and 5 denote diaphragms corresponding to the flanges, and are provided in the core portion 1a of the steel box column 1 so as to correspond to the flanges of the girders 2 and 3. The diaphragm 4 corresponding to the flange is divided into two diagonally as shown in FIG.
The two sides 4a and 4b are fixed to the inner wall of the core part 1a by arc welding P, respectively, and electroslag welding Q is applied only along the dividing line to be integrated by welding. Although not shown, the diaphragm 5 corresponding to the flange is the same as the diaphragm 4 corresponding to the flange.
Reference numerals 6 and 7 denote diaphragms corresponding to the webs. The diaphragms are longitudinally opposed to the center of the inner wall of the core portion 1a of the steel box column 1 in advance corresponding to the webs of the girders 2 and 3, and have upper and lower ends. The diaphragms 4 and 5 corresponding to the flanges to be attached later are respectively brought into contact with each other. Reference numerals 8 and 9 also denote diaphragms corresponding to the web. The diaphragms 6 and 7 of the core portion 1a are vertically opposed to the center of the inner wall of the non-attached diaphragms 6 and 7, and the upper and lower ends thereof have the flanges. Are brought into contact with the diaphragms 4 and 5, respectively. That is, the four diaphragms corresponding to the web are first attached to the four inner surfaces of the core part 1a of the steel box column 1 in the vertical direction, and the diaphragms 4, 5 corresponding to the flanges to be attached later are respectively attached to the upper and lower ends. Are in contact with each other. Then, the diaphragm corresponding to the triangularly divided flange is integrated by electroslag welding along the dividing line.

In this way, the diaphragm corresponding to the web can be mounted in the core of the steel box column. In this case, the cross section of the steel frame can be reduced because the web of the girder works effectively, thereby reducing the steel consumption by 10%. It is possible to reduce the degree.

[Effects of the Invention] As described above, according to the present invention, since the diaphragm corresponding to the web is provided in the core portion of the steel box column at the intersection of the steel box column and the girder, the web of the girder is subjected to the strength calculation. It is very economical because the steel section can be reduced by reducing the steel cross section.

In addition, when attaching the diaphragm corresponding to the flange to the steel box column, electroslag welding with a large heat input is not performed, so that a change in the material of the steel frame column can be prevented beforehand.
It has an excellent effect that it can be applied to high-strength steel of kilo class or higher.

[Brief description of the drawings]

FIG. 1 is a front view of an essential part showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, FIG. 3 is a front view of an essential part showing a conventional example, and FIG. FIG. 4 is a sectional view taken along line BB of FIG. 3. 1 ... steel box column 1a ... core part 2, 3 ... girder 4, 5 ... diaphragm corresponding to flange 4a, 4b ... half triangle part 6, 7, 8, 9 ... diaphragm P corresponding to web …… Arc welding Q …… Electro slag welding

Claims (1)

(57) [Claims] 1. A diaphragm corresponding to a web of the girder, which is first welded to an inner wall surface of the core in a core portion of a steel box column to which a girder is attached, and then a diaphragm corresponding to a flange of the girder. The two parts divided in the diagonal direction are brought into contact with the upper and lower ends of the diaphragm corresponding to the web, respectively, and arm-welded to the inner wall surface of the core portion, and electroslag welding is performed along the diagonal division line. A diaphragm mounting method for a steel box column, wherein the diaphragm divided into two parts is integrated with each other.