JP3049571B2 - Joint method of steel tube concrete column and beam without diaphragm - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining method of a steel pipe concrete column and a steel beam mainly used as a pillar of a large building, and more specifically, a diaphragm-free steel pipe concrete column not using a diaphragm. On the method of joining beams and beams.

[0002]

2. Description of the Related Art Steel tube concrete columns have a good structural performance because they have a closed cross-sectional shape, and are suitably used as columns of large steel-framed buildings. Conventionally, as a method of joining a steel pipe concrete column and a steel beam, as illustrated in FIGS. 7 and 8, first, a flange portion 31 a of a steel beam 31 is butt-joined to a column beam connection portion of a steel pipe concrete column 30. Diaphragms 32 and 32 are provided at two upper and lower positions, and a gusset plate 33 is also provided. The steel beam 31 first bolts its web to the gusset plate 33, and then connects the upper and lower flange portions 31 a and 31 a to the upper and lower diaphragms 3.
2, 32 are butt-welded, and the tensile or compressive stress of the steel beam 31 is transmitted efficiently through the diaphragm 32 in the horizontal direction.

[0003]

According to the column-beam joining method using the above-mentioned diaphragm, joining excellent in mechanical performance can be achieved. However, when this column-beam joining method is performed, a large number of man-hours are required to manufacture the joints of the diaphragm 32, and the productivity of the steel pipe columns is hindered. That is, the steel pipe 30 is cut (fused) at each position of the beam-to-column connection, the diaphragm 32 is attached by welding, and the short steel pipe 34 is joined between the upper and lower diaphragms 32, 32 to restore it to a series of pipe bodies again. It is a very complicated and time-consuming process. Therefore, it is impossible to produce without requesting a specialized steel frame processor. As a result, the unit price of the steel pipe 30 itself is originally expensive, and the manufacturing and processing costs of the diaphragm 32 are extremely high, which is a factor that greatly increases the steel frame construction cost. In recent years, the production capacity of steel processing has become saturated due to the remarkable increase in the amount of steel work and the extremely shortage of workers, and it is a natural social situation that delays delivery and increases the base of processing wages. Delays have had a significant negative impact on rising construction costs.

Accordingly, an object of the present invention is to provide a diaphragm without a diaphragm which can reduce the number of man-hours for manufacturing a steel frame, reduce costs and shorten the construction period without using the diaphragm which is a cause of the above-mentioned problems of the prior art. It is to provide a joining method of steel pipe concrete columns and beams.

[0005]

As a means for solving the above-mentioned problems of the prior art, a method of joining steel pipe concrete columns and beams without diaphragm according to the present invention is shown in FIGS.
As shown in the embodiment in FIG. 6, a gusset plate 2 is provided at a beam-column connection portion of a steel pipe 1, and a required number of sheaths 3 that penetrate the steel pipe 1 in a beam-to-beam direction are installed at positions near a flange of a beam 4. The steel beam 4 is first bolted to the gusset plate 2 with its web, the flange portion 4a is butt-welded to the steel pipe 1, and concrete 7 is filled in the hollow portion of the steel pipe 1, and after the concrete 7 has developed strength. It is characterized in that the bolt 6 in the sheath 3 is strongly tightened with a nut 7.

[0006]

The processing of the steel pipe 1 is simply performed by drilling a bolt hole, attaching the sheath 3, and welding the gusset plate 2, and can be easily processed even on site. The tensile or compressive stress of the steel beam 4 is efficiently transmitted in the horizontal direction from the pipe wall of the steel pipe 1 through the bolt 6, and there is no problem such as local deformation of the steel pipe 1.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
FIGS. 1A and 1B and FIGS. 2A and 2B sequentially show essential process diagrams of a joining method of a steel pipe concrete column and a beam without a diaphragm according to the present invention. FIG. 1A shows a gusset plate 2 provided at a beam-to-column connection of each floor, and a steel pipe 1 for a column in which a required number of sheaths 3 penetrating the steel pipe 1 in a direction between beams are installed on a lower steel pipe column 1 ′. This shows the added stage. Symbol F indicates a floor position on each floor of the building. The gusset plate 2 is attached by welding. Sheath 3
Is drilled in the steel pipe 1 and installed through the hole. As the sheath 3, an iron pipe or a synthetic resin pipe having strength and rigidity capable of withstanding the later concrete placing pressure is used. As shown in detail in FIGS. 3 to 5, the position and the number of the sheaths 3 are four in the vicinity of the upper and lower flange portions 4 a of the steel beam 4 in the vicinity of the upper and lower flange portions 4 a. A total of eight (the number and arrangement are not limited to those in the illustrated example) are provided. When the beam 4 is joined to the steel pipe column 1 in four directions perpendicular to each other as shown in FIG. 6, the sheath 3 (therefore, the bolt passed therethrough) is vertically positioned in each of two vertical directions. With a slight offset. In any case, since the welding for attaching the gusset plate 2 and the drilling for installing the sheath 3 are relatively simple processes and operations, they are performed at the site of the building site without requesting a steelworker. be able to.

FIG. 1B shows that the web of the steel beam 4 is bolted to the gusset plate 2 with respect to the steel pipe column 1.
The upper and lower flange portions 4a, 4a show the stage in which the butt welding 5 is directly performed on the steel pipe 1. At this stage or before the steel pipe column 1 is erected, the bolts 6 (see FIG. 3 or PC steel rods) are passed through the respective sheaths 3.

FIG. 2A shows a stage in which concrete 7 is filled in the hollow portion of steel pipe 1. FIG. 2B shows a stage in which the nut 8 is screwed into the bolt 6 passed through the sheath 3 and then tightly tightened with a constant torque after the concrete 7 has hardened and developed its strength. The tightening strength of the nut 8 prevents out-of-plane local deformation in which the steel pipe 1 is locally entangled or dented due to tensile or compressive stress of the steel beam 4, and reduces stress from the flange portion 4a of the steel beam 4 in particular. Any strength that can be smoothly transmitted to the bolt 6 and processed is sufficient. In order to make the above-described operation of the bolt 6 more efficiently performed, a large square washer 9 having a large pressure receiving area as shown in FIG. It is also possible to use a plate-shaped washer 10 having a large thickness as shown in FIG. 5, or to use an angle-like shaped steel or the like.

[0010]

[Effects of the present invention] According to the jointing method of a steel pipe concrete column and a beam without a diaphragm according to the present invention, no processing (particularly cutting and welding of the steel pipe, etc.) of the column-beam connection part of the steel pipe 1 is required. In other words, the raw pipe can be used as a steel pipe as it is, and the number of processing steps is greatly reduced, so that it is possible to improve the efficiency of steel frame production, shorten the delivery time, and reduce the cost of steel frames, thereby contributing to shortening the construction period and reducing construction costs. It is.

[Brief description of the drawings]

FIGS. 1A and 1B are process diagrams of the first and second stages of the joining method of the present invention.

FIGS. 2A and 2B are process diagrams of the third and fourth stages of the joining method of the present invention.

FIG. 3 is an enlarged view of a circle 3 indicated in FIG. 2B.

FIG. 4 is an enlarged view taken along line 4-4 indicated in FIG. 2B.

FIG. 5 is an enlarged view showing a different embodiment taken along line 4-4 indicated in FIG. 2B.

FIG. 6 is an enlarged cross-sectional view taken along line 6-6 indicated in FIG. 2B.

FIG. 7 is a plan view of FIG. 8 showing a conventional joining method.

FIG. 8 is an elevation view showing a conventional joining method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel pipe 2 Gazette plate 3 Sheath 4 Steel beam 4a Flange part 7 Concrete 6 Bolt 8 Nut

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tsugio Sakao 8-21-1, Ginza, Chuo-ku, Tokyo Inside the Tokyo Head Office of Takenaka Corporation (72) Inventor Takashi Matsuzaki 8-21 Ginza, Ginza, Chuo-ku, Tokyo No. 1 Inside Takenaka Corporation Tokyo Main Store (72) Inventor Mamoru Kimura 5-14 Minamisuna, Koto-ku, Tokyo Inside Technical Research Center Takenaka Corporation (72) Inventor Yasuo East End Minamisuna 2-chome, Koto-ku, Tokyo No. 5-14, Takenaka Corporation Technical Research Institute (72) Inventor Naoki Mizutani 2-5-14 Minamisuna, Koto-ku, Tokyo Inside Takenaka Corporation Technical Research Institute (72) Inventor, Nebu Ishibashi Ginza, Chuo-ku, Tokyo No. 8-21-1, Takenaka Corporation Tokyo Main Store (56) References JP-A-62-264236 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04B 1/30

Claims (1)

(57) [Claims] 1. A gusset plate is provided at a beam-to-column connection of a steel pipe, and a required number of sheaths penetrating the steel pipe in a direction between beams are installed near a flange of the beam. Bolted to a steel pipe, the flange part is butt-welded to a steel pipe, concrete is filled in the hollow part of the steel pipe, and after the concrete has developed strength, bolts in the sheath are tightened with nuts, without a diaphragm. Steel pipe concrete column and beam joining method.