JP3079332B2 - Mounting method of outer diaphragm of steel pipe column - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of mounting an outer diaphragm of a steel pipe column (and a filled steel pipe concrete column, hereinafter the same) used for a high-rise or super-high-rise steel-frame or steel-frame concrete building.

[0002]

2. Description of the Related Art With the rise of buildings and the rise of skyscrapers, the importance of column-beam frames using steel pipe columns is increasing. As shown in FIG. 3 (A), the beam-column frame composed of the steel pipe columns 1 is assembled by joining the beams 3 to the steel pipe columns 1 having the outer diaphragm 2 and the gusset plate 4 mounted at the mounting positions of the beams.

[0003] As a method of attaching the outer diaphragm 2 to the steel pipe column 1, conventionally, as shown in FIG. 4, a doughnut-shaped outer diaphragm 2 is blown from a single large flat steel plate 21 in a steel processing factory. The outer diaphragm 2 is passed through a steel pipe column 1 and the two are integrally joined by fillet welding or the like for attachment.
The attachment of the gusset plate 4 is also performed at this stage.
After that, the steel pipe column 1 is transported to a construction site and constructed, and the beam 3 is joined to assemble the column-beam frame.

[0004]

According to the method of manufacturing the outer diaphragm 2 shown in FIG. 4, an unnecessary portion (hatched portion in the figure) of the large flat steel plate 21 is larger than the area of the outer diaphragm 2. It is very uneconomical. When the outer diaphragm 2 is cut out by the gas fusing method, as shown in FIG. 5, the thickness t of the flat steel plate 21 is as large as about 50 mm, and the gas flame 11 spreads forward from the outlet of the blow pipe 25. Therefore, it is cut diagonally as shown in the figure, and it is difficult to secure a right angle. For this reason, it is difficult to obtain the processing and assembly accuracy of the outer diaphragm 2. In addition, cutting by gas fusing requires a very long working time, and has a disadvantage that the construction period is prolonged.

[0005] Accordingly, an object of the present invention is to provide an excellent economical property,
An object of the present invention is to provide a method of attaching an outer diaphragm to a steel pipe column, which can reduce the cost and enhance the processing and assembling accuracy in a short period of time.

[0006]

As a means for solving the above-mentioned problems, a method for mounting an outer diaphragm on a steel pipe column according to the present invention is described in detail with reference to FIGS. In the diaphragm mounting method, the flat steel 22 formed to have a width b and a thickness t required as the outer diaphragm 2 and a length L substantially equal to the circumference of the steel pipe column 1 is curved in a plane substantially parallel to the plate surface. A ring-shaped outer diaphragm 2 is formed by joining both ends 2a and 2b, and the outer diaphragm 2 is passed through the steel pipe post 1 and is integrally attached to the steel pipe post 1 at a predetermined mounting position by welding. .

Further, according to the method of mounting the outer diaphragm on a steel pipe column according to the present invention, after forming the outer diaphragm 2 in the form of a ring, heat treatment is performed for the purpose of improving the stress-strain relationship and removing residual stress. Thereafter, the outer diaphragm 2 is attached to the steel pipe column 1.

[0008]

The flat steel plate 22 is bent in a plane parallel to the plate surface and the butted ends 2a and 2b are joined to form the ring-shaped outer diaphragm 2, which is not formed by the gas fusing method or the like. Therefore, it is not necessary to design a plate, there is no loss of steel material, and processing can be performed with high dimensional accuracy. Processing time can also be greatly reduced. Since the heat treatment improves the stress-strain relationship of the outer diaphragm 2 and removes the residual stress,
High reliability of strength during long service periods.

[0009]

Next, an embodiment of the present invention shown in FIGS. 1 and 2 will be described. FIG. 1A shows an outer diaphragm 2 of a steel pipe column 1.
A long flat steel plate 26 or a strip rolled and manufactured to a thickness t (typically about 50 mm) and a width b (typically about 120 to 150 mm) required as a steel pipe column 1 has a circumferential length (the outer diameter of the steel pipe 1 is The circumference is usually 251 because it is 80cm to 100cm.
(about 314 cm to about 314 cm). However, as shown in FIG. 1B, the flat steel 22 is prepared by a steel plate 27 having an integral multiple of the required width b.
Is made by cutting as shown by the dotted line. The flat steel 22 prepared in this manner is, as shown in FIG.
Cold bending is performed in a ring shape in a plane substantially parallel to the plate surface, and both ends 2a and 2b are abutted and joined.
A ring-shaped outer diaphragm 2 as shown in FIG. 1D is completed. As shown in FIG. 1 (D), when it is necessary to provide a straight portion 2c as a beam joint at the outer peripheral edge of the outer diaphragm 2, it is usually formed into a ring shape and then processed. It is also convenient to carry out the forming in advance at the stage of preparing. The butted ends 2a and 2b are joined by, for example, flash butt welding, arc welding, electroslag welding, electrogas welding, or the like. Since excessive plastic strain is generated inside the outer diaphragm 2 manufactured as described above and elongation at the time of yield cannot be expected, heat treatment is performed for the purpose of improving the stress-strain relationship and removing residual stress. In addition, distortion correction to ensure predetermined accuracy such as inner diameter, ring thickness, bending, etc. is performed, or machining is performed as necessary,
Further increases in accuracy are also performed.

The outer diaphragm 2 manufactured as described above is passed through the steel pipe column 1 as shown in FIG. 2, and the two are integrally joined at the joint position (attachment position) of the beam by fillet welding to be attached. Done. At the time of this welding, a gusset plate 4 for web joining is also welded between a pair of upper and lower outer diaphragms 2 and 2 provided corresponding to upper and lower flanges of a steel beam (H-section steel or the like).

When the outer diaphragm 2 is joined to the steel tube column 1, a hydraulic or other expander is inserted into the steel tube and set, and the outer wall of the outer wall 2 is limited to the portion where the outer diaphragm 2 is positioned. And expand it in the direction
The pipe wall is brought into close contact with the inner diameter surface of the outer diaphragm 2,
A method of eliminating the need for welding or performing fillet welding just in case to integrate the two is also feasible. In this case, the expanded portion of the steel pipe is always subjected to heat treatment for improving the properties.

[0012]

According to the method for mounting the outer diaphragm of the steel pipe column according to the present invention, the outer diaphragm 2 is formed by bending a flat steel plate 22 having a predetermined size and joining both ends of the flat steel plate 22.
Can be manufactured, the economical efficiency can be improved by eliminating any material loss, and the mounting cost can be reduced. In addition, the preparation and bending of the flat steel 22 can be performed quickly, and the construction period can be shortened. Furthermore, the dimensional accuracy of each part can be easily improved by appropriately performing heat treatment, machining, and the like.

[Brief description of the drawings]

1 (A) to 1 (D) are explanatory views showing a procedure of a method of attaching an outer diaphragm to a steel pipe column according to the present invention.

FIG. 2 is an elevation view showing a state where an outer diaphragm is attached to a steel pipe column.

FIG. 3A is an elevation view showing an example of a beam-column frame including steel pipe columns, and FIG. 3B is a perspective view of the steel pipe columns.

FIG. 4 is an explanatory view of a conventional method for producing a cutout of an outer diaphragm.

FIG. 5 is a cross-sectional view showing a state where a thick steel plate is cut by a gas fusing method.

[Explanation of symbols]

 Reference Signs List 1 steel pipe column 2 outer diaphragm 2a, 2b end 22 flat steel

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI E04C 3/34 E04C 3/34 (72) Inventor Makoto Hara 8-21-1, Ginza, Chuo-ku, Tokyo Inside Takenaka Corporation Tokyo Main Store ( 72) Inventor Katsuyoshi Konan 8-21-1, Ginza, Chuo-ku, Tokyo, Japan Inside the Takenaka Corporation Tokyo Main Office (72) Inventor Hisashi Teramachi 8-2-1, Ginza, Chuo-ku, Tokyo Tokyo Main Office, Takenaka Corporation Inside shop (72) Inventor Hideto Ifuku 8-21-1, Ginza, Chuo-ku, Tokyo Inside Takenaka Corporation Tokyo Main Store (56) References JP-A-4-302628 (JP, A) JP-A-5- 331966 (JP, A) JP 50-104412 (JP, U) JP 51-129116 (JP, U) Patent 2754097 (JP, B2) Patent 2961455 (JP, B2) JP 2-48699 (JP) , B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04C 3/32 E04C 3/34 E04B 1/24 E04B 1/30 E04B 1/58 508 B23K 9/00 501

Claims (2)

(57) [Claims] 1. A method for mounting an outer diaphragm on a steel pipe column, comprising: placing a flat steel formed to have a width and a thickness necessary for the outer diaphragm and a length substantially equal to a circumferential length of the steel pipe column in a plane substantially parallel to a plate surface thereof. Forming a ring-shaped outer diaphragm by joining at both ends to form a ring-shaped outer diaphragm, passing the outer diaphragm through a steel pipe column, and integrally attaching to the steel pipe column at a predetermined mounting position by welding, Outer diaphragm mounting method. 2. After forming a ring-shaped outer diaphragm, heat treatment is performed for the purpose of improving the stress-strain relationship and removing residual stress, and thereafter, the outer diaphragm is attached to a steel pipe column. The method for mounting an outer diaphragm on a steel pipe column according to claim 1.