JP3079331B2 - Installation method of outer stiffener ring of concrete column filled with steel pipe - 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 for mounting an outer stiffener ring on a concrete-filled steel tube concrete column (hereinafter, may be abbreviated as a CFT column) used as a column for a large-scale high-rise or high-rise building. .

[0002]

2. Description of the Related Art Conventionally, various types of CFT columns have been known (for example, see Japanese Patent Application Laid-Open No. 59-44442) and have already been put to practical use. In order to assemble a column-beam frame as shown in FIG. 2, whether it is a CFT column or a normal steel tube column, a connecting element for transmitting a load between the column and the beam is indispensable at the beam connecting position of the column 1. Generally, an outer stiffener ring 2 or an outer diaphragm is attached to the outer periphery of a pillar 1 to join a beam 3.

[0003]

[Problems to be Solved by the Invention] Conventionally, a general outer stiffener ring is manufactured by cutting a rolled steel plate having a predetermined thickness into a donut shape by a gas fusing method. However, no matter how efficient the planing design, steel loss occurs at a higher rate than the effective portion, which is very uneconomical. The thickness of the flat steel for the outer stiffener ring is usually a thick plate of about 50 mm. For example, if the inner diameter is 80 cm and the outer diameter is 1
In order to cut out a large donut shape of about 10 cm by the gas fusing method, a very long processing time is required, the construction period is prolonged, and the processing cost is increased. In addition, the gas flame when cutting a thick steel plate by the gas fusing method as described above expands in a conical shape from the outlet of the blow pipe toward the end, and as a result, the cut surface is inclined.
It is extremely difficult to obtain a right angle cut surface, and it is also difficult to ensure dimensional accuracy. JP-A-59-165744;
In the inventions described in Japanese Patent Application Publication No. 0-23538 and Japanese Patent Application Laid-Open No. Sho 60-33962, a plurality of joining metal fittings are prepared in the circumferential direction, and these are attached to the outer periphery of a steel pipe column by welding to provide joining elements for beams. It is deemed that the intention is to avoid the difficulties mentioned above. Even if a donut-shaped outer stiffener ring could be manufactured, the work of fitting this from the end of a long steel pipe of several meters to several tens of meters, sequentially transferring it to its mounting position, and positioning the outer stiffener ring itself would be difficult. It is large and very difficult to do manually by hand. In addition, in order to perform smooth transfer in the state of being fitted to the steel pipe, the accuracy of the outer diameter of the steel pipe itself may not be constant, so that the outer diameter of the steel pipe and the inner diameter of the outer stiffener ring may not be constant. A fairly large margin (diameter difference) is required. However, the structure in which the outer stiffener ring is finally attached integrally to the steel pipe by welding or the like has a problem in that the margin (diameter difference) becomes large. For example, when the outer stiffener ring is attached to a steel pipe column by fillet welding, the gap is limited to about 2 mm, but it is practically difficult to keep this limit.

Accordingly, an object of the present invention is to provide an outer stiffener ring capable of reducing the number of man-hours required for manufacturing a steelwork, improving workability and accuracy, ensuring quality, and reducing costs. It is an object of the present invention to provide a mounting method of the helmet.

[0005]

As a means for solving the above-mentioned problems in the prior art, a method for mounting an outer stiffener ring of a concrete-filled steel tubular column according to the present invention is shown in FIGS. 1A and 1B. As described above, the flat steel 5 formed to have the width W and thickness t required for the outer stiffener ring 2 and the length L substantially equal to the circumference of the steel pipe 1 is placed in a plane parallel to its plate surface. Bend into a ring shape to the extent that it can be fitted to the outer periphery of the steel tube with a margin, and the outer stiffener ring-shaped member 2 ′ formed as described above is fitted to the outer periphery of the steel pipe 1 and set at a predetermined mounting position. (FIG. 1A), and the outer stiffener ring-shaped object 2 ′ is bent at its mounting position such that the inner peripheral surface thereof is in close contact with the outer peripheral surface of the steel pipe 1, and finally the outer stiffener ring-shaped object 2 ′. ' The two end faces 2a and 2b are butt-joined to complete a ring (FIG. 1B), and the steel pipe 1 and the outer stiffener ring 5 are subjected to a heat treatment mainly for improving the stress-strain relationship and removing residual stress; Are characterized.

[0006]

Since the flat stiffener ring 2 is formed by bending the flat steel 5 and forming by the gas fusing method is not performed, no waste of the steel material occurs and the processing can be performed in a short time with high dimensional accuracy. Further, since the flat steel 5 is not formed into a complete ring at first, but is formed into a ring shape enough to be able to fit into the outer periphery of the steel pipe 1 with a margin, the outer stiffener ring 2 ′ is formed along the steel pipe 1. The work of transferring to the mounting position is extremely easy.

The outer stiffener ring 2 is completed by bending the outer stiffener ring 2 so as to be in intimate contact with the outer periphery of the steel pipe 1, and welding with the steel pipe 1 is not performed (FIG. 1B). By the way, concrete column 1 and steel beam 3
As a result of research on the simplification of the connection part, it was found that if the steel pipe 1 and the outer stiffener ring 2 are in close contact, there is no problem with the flow of force to the columns and beams without welding them. Have been.

By the heat treatment, the stress-strain relationship between the steel pipe 1 and the outer stiffener ring 2 is improved and the residual stress is removed, so that long-term operation is not hindered.

[0009]

Next, an embodiment of the present invention shown in FIGS. 1A and 1B will be described. FIG. 1A shows a width W (W is usually 120 to 1) required for the outer stiffener ring 2 completed as shown in FIG. 1B.
50 mm, thickness t (t is usually about 50 mm), and circumferential length of steel pipe 1 (the outer diameter of steel pipe 1 is usually 80 cm to 100 mm).
cm, so the circumference is about 251cm to 314cm)
Is formed into a ring shape by bending the flat steel 5 formed to have a length L to such an extent that the flat steel 5 can be fitted to the outer periphery of the steel pipe 1 with a margin in a plane parallel to the plate surface (for example, FIG.
A), the outer stiffener ring-shaped member 2 ′ is fitted around the outer periphery of the steel pipe 1, transferred to a predetermined attachment position (beam joining position), and set (positioned). Regarding the stripping of the flat steel 5, at the stage of rolling and manufacturing a steel strip or steel sheet, it is manufactured in advance to a width W and a thickness t required as the outer stiffener ring 2, and the strip steel or steel sheet is manufactured to a required length. A method of manufacturing a steel sheet having a width that is an integral multiple of the width W required for the outer stiffener ring 2 and cutting the steel sheet to a required width W and length L, and the like. Can be implemented. In the case where it is necessary to provide a straight portion 2c as a beam connection port on the outer peripheral edge of the outer stiffener ring 2 as shown in FIG.
It is convenient to carry out the shaping at the stage.

The above-mentioned outer stiffener ring 2 'is
At the above-described mounting position, the stiffener ring-shaped member 2 ′ is used by using a bending machine (not shown) or the like.
Bending is performed while tightening the inner peripheral surface (inner peripheral edge) of the steel pipe 1 along the outer peripheral surface of the steel pipe 1 so as to be in close contact therewith. Then, as shown in FIG. 1B, the both end surfaces 2a and 2b of the outer stiffener ring 2 'are finally butted and welded to complete the ring. For the welding, flash butt welding, arc welding, electroslag welding, electrogas welding, or the like can be performed. Thereafter, a gusset plate for web joining is also welded between a pair of upper and lower outer stiffener rings provided corresponding to the upper and lower flanges of the steel beam (H-section steel).

Next, the portion of the steel pipe 1 and the outer stiffener ring 2 attached to the steel pipe 1 are put into a heat treatment furnace (not shown) and subjected to a heat treatment mainly for improving the stress-strain relationship and removing the residual stress. And all the mounting steps are completed.

[0012]

According to the method of mounting the outer stiffener ring of the concrete-filled steel tubular concrete column according to the present invention, almost no steel material loss occurs in forming the flat steel 5 for manufacturing the outer stiffener ring, and the method is economical. is there. Of course,
No labor is required for the planing design, and the processing of the flat steel 5 is reduced, so that labor saving and efficiency can be achieved. Further, it is easy to fit the outer stiffener ring (outer stiffener ring-shaped object 2 ') to the steel pipe 1 and transfer it to the mounting position. Since no installation work is required, it is possible to shorten the installation period and reduce costs by streamlining and reducing the number of man-hours.

[Brief description of the drawings]

FIGS. 1A and 1B are plan views showing a stage in which an outer stiffener ring is being attached to a steel pipe and a completed state of attachment.

FIG. 2 is an elevation view of a beam-column frame including steel pipe columns and steel beams.

FIG. 3 is a plan view of a steel pipe column.

[Explanation of symbols]

 2 outer stiffener ring 1 steel pipe 5 flat steel 2 'outer stiffener ring 2a, 2b end face

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 Inside the Takenaka Corporation Tokyo Main Store (72) Inventor Hisashi Teramachi 8-2-1 Ginza, Chuo-ku, Tokyo Tokyo Main 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) 104412 (JP, U) JP-A-53-129116 (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 (1)

(57) [Claims] 1. A flat steel formed to have a width and thickness required as an outer stiffener ring and a length substantially equal to a circumference of a steel pipe,
In a plane parallel to the plate surface, the steel pipe is bent into a ring shape to an extent that it can be fitted to the outer circumference of the steel pipe with a margin, and the ring-shaped outer stiffener formed as described above is inserted into the outer circumference of the steel pipe. Setting it to a predetermined mounting position, and bending the outer stiffener ring-shaped object at its mounting position so that its inner peripheral surface is in close contact with the outer peripheral surface of the steel pipe; Filled steel pipes, characterized in that they are joined by joining both end faces of the steel pipe to complete a ring, and that the steel pipe and the outer stiffener ring are subjected to heat treatment for the purpose of improving stress and strain relations and removing residual stress. How to install stiffener rings outside concrete columns.