JPH05331966A - Fitting of outside stiffener for packing type steel tubular concrete column - Google Patents

Abstract

PURPOSE:To reduce the number of manufacturing processes by a method in which a flat steel is formed by a bending working to fit it on the periphery of a steel tube to form an outside stiffener, both ends of the stiffener are butted to each other to form a joint ring, and the ring is subjected to a heat treatment. CONSTITUTION:A flat steel 5 having a thickness (t) and thickness (W) necessary for an outside stiffener 2 and a length (L) for a steel tube 1 is bent into a ring form in a size enough to fit on the periphery of the steel tube 1. The stiffener 2' is fitted on the periphery of the steel tube 1 and set to a given fitting position. The stiffener 2' is then bent for its inside to closely fit on the periphery of the tube 1, and both ends 2a and 2b of the stiffener 2' are butted and jointed to each other to obtain a ring. The stiffener 2 attached to the tube 1 is heat treated in a heat treatment furnace to remove residual stress.

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 stiffener ring on a filled type steel pipe concrete column (hereinafter sometimes abbreviated as CFT column) which is adopted as a column of a large-scale high-rise or super high-rise building. ..

[0002]

2. Description of the Related Art Conventionally, various CFT columns have been known (see, for example, those disclosed in Japanese Patent Laid-Open No. 59-44442) and have already been put into practical use. In order to assemble a beam-column structure as shown in FIG. 2 regardless of whether it is a CFT column or an ordinary steel pipe column, a joining element for transmitting a load between the column and the beam is indispensable at the beam joining position of the column 1. In general, the outer stiffener ring 2 or the outer diaphragm is attached to the outer periphery of the column 1 to join the beam 3.

[0003]

Conventionally, a general outer stiffener ring is manufactured by a method of cutting a rolled steel plate having a predetermined thickness into a donut shape by a gas fusing method. However, no matter how efficient the plate cutting design is, it is very uneconomical because steel loss occurs at a higher rate than the effective portion. The thickness of the flat steel for outer stiffener ring is usually a thick plate of about 50 mm. For example, the inner diameter is 80 cm and the outer diameter is 1.
Cutting into a large donut shape of about 10 cm by the gas fusing method requires a very long processing time, requires a long construction period, and increases the processing cost. Further, the gas flame in the case of cutting out the thick steel plate as described above by the gas fusing method is expanding in a conical shape from the blow pipe outlet toward the front, and as a result, the cut surface is inclined,
It is very difficult to obtain a right-angled cut surface, and it is also difficult to secure dimensional accuracy. JP 59-165744 A, JP 6
In inventions such as 0-23538 and Japanese Patent Laid-Open No. 60-33962, a plurality of joint fittings are prepared in the circumferential direction, which are attached to the outer circumference of a steel pipe column by welding to provide a beam joint element. It is admitted that this is due to the intention to avoid the difficulties mentioned above. Even if a doughnut-shaped outer stiffener ring can be manufactured, the work of fitting this from the end of a long steel pipe of several meters to ten and several meters and sequentially transferring it to its mounting position and positioning the outer stiffener ring itself It is large and very difficult to do manually by hand. In addition, in order to smoothly transfer the steel pipe fitted in the steel pipe, the accuracy of the outer diameter of the steel pipe itself may not be constant, so that it may occur between the outer diameter of the steel pipe and the inner diameter of the outer stiffener ring. A considerably large margin (diameter difference) is required. However, in the structure where the outer stiffener ring is finally integrally attached to the steel pipe by welding or the like, there is a problem that the above-mentioned margin (diameter difference) becomes large. For example, when the outer stiffener ring is attached to the steel pipe column by fillet welding, the gap is limited to about 2 mm, but it is practically difficult to keep this limit.

Therefore, an object of the present invention is to reduce the number of man-hours required for manufacturing a steel frame, to improve workability and accuracy, ensure quality, and reduce costs. Is to provide a mounting method.

[0005]

As a means for solving the above-mentioned problems of the prior art, the method of mounting the outer stiffener ring of the filled type steel pipe concrete column according to the present invention is shown in FIGS. As described above, the flat steel 5 formed to have the width W and the thickness t required for the outer stiffener ring 2 and the length L that is substantially the same as the circumferential length of the steel pipe 1 is used in the plane parallel to the plate surface. Bending to the extent that it can be fitted into the outer circumference of the steel tube to a ring shape, and fitting the outer stiffener ring-shaped material 2'formed as described above to the outer circumference of the steel pipe 1 and setting it at a predetermined mounting position. (FIG. 1A), and the outer stiffener ring 2 ′ is bent so that the inner peripheral surface of the outer stiffener ring 2 ′ is in close contact with the outer peripheral surface of the steel pipe 1 at the mounting position, and finally the outer stiffener ring 2 is formed. ' Both ends 2a and 2b are butted and joined to each other to complete a ring (FIG. 1B), and the steel pipe 1 and the outer stiffener ring 5 are subjected to heat treatment mainly for the purpose of improving the stress-strain relationship and removing residual stress. Are characterized respectively.

[0006]

The flat steel 5 is bent to form the outer stiffener ring 2 and is not formed by the gas fusing method, so that the steel material is not wasted and the processing can be performed in a short time with high dimensional accuracy. Further, since the flat steel 5 is not initially formed into a complete ring, but is formed into a ring shape that can be fitted into the outer periphery of the steel pipe 1 with a margin for the time being, the ring-shaped material 2'for the outer stiffener 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 so as to be in close contact with the outer circumference of the steel pipe 1 and is not welded to the steel pipe 1 (FIG. 1B), so that the labor and time for welding can be saved. By the way, the filling type steel pipe concrete pillar 1 and the steel beam 3
As a result of research on simplification of the joint part with, it was clarified that if the steel pipe 1 and the outer stiffener ring 2 are in close contact with each other, there is no problem in the flow of force to the columns and beams without welding them. Has been done.

By the heat treatment, the stress-strain relationship between the steel pipe 1 and the outer stiffener ring 2 is improved, and residual stress is removed. As a result, long-term service is not hindered.

[0009]

EXAMPLES Next, examples of the present invention shown in FIGS. 1A and 1B will be described. FIG. 1A shows a width W required for the outer stiffener ring 2 completed as shown in FIG.
50 mm) and thickness t (t is usually about 50 mm), and the circumference of the steel pipe 1 (the outer diameter of the steel pipe 1 is usually 80 cm to 100 cm).
cm, so circumference is 251 to 314 cm)
The flat steel 5 formed to have a length L is bent into a ring shape so that the flat steel 5 can be fitted into the outer circumference of the steel pipe 1 with a margin in a plane parallel to the plate surface (see, for example, FIG. 1).
Along with the state A), the outer stiffener ring-shaped material 2 ′ is fitted to the outer circumference 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 strip steel or a steel plate, it is produced in advance to have a width W and a thickness t required as the outer stiffener ring 2, and the strip steel or the steel plate has a required length. A method of cutting into a length L, or a method of manufacturing a steel plate having a width that is an integral multiple of the width W required for the outer stiffener ring 2 and cutting it into a required width W and a length L, and the like. Can be carried out. In addition, as shown in FIG. 3, when it is necessary to provide a straight portion 2c as a beam joint on the outer peripheral edge of the outer stiffener ring 2, a flat bar 5
It is convenient to carry out molding at the stage of.

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

Next, 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 the heat treatment is mainly aimed at improving the stress-strain relationship and removing residual stress. Then, all the mounting steps are completed.

[0012]

According to the method of attaching the outer stiffener ring of the filling type steel tube concrete column according to the present invention, steel material loss hardly occurs in the forming of the flat steel 5 for manufacturing the outer stiffener ring, which is economical. is there. Of course,
The planing design does not require any labor, and the flat steel 5 requires a small amount of processing, so that labor saving and efficiency can be achieved. Furthermore, it is easy to fit the outer stiffener ring (the outer stiffener ring-shaped material 2 ') into the steel pipe 1 and transfer it to its mounting position. The outer stiffener ring 2 can be welded or wedged by simply adhering it to the steel pipe 1. Since it does not require time and effort for installation, it can be expected to reduce installation time and cost by streamlining and streamlining by reducing man-hours.

[Brief description of drawings]

1A and 1B are plan views showing a stage in the middle of attaching an outer stiffener ring to a steel pipe and a completed state of attachment.

FIG. 2 is an elevational view of a beam-column structure composed of a steel pipe column and a steel beam.

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'ring for outer stiffener 2a, 2b end face

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Makoto Hara Makoto Hara, 21-2-1 Ginza, Chuo-ku, Tokyo Stock company Takenaka Corporation Tokyo Main Store (72) Inventor Katsuyoshi Konan Ginza 8-chome, Chuo-ku, Tokyo No. 1 Incorporated Takenaka Corporation Tokyo Main Store (72) Inventor Hisashi Teramachi 8-21-1, Ginza, Chuo-ku, Tokyo Incorporated Takenaka Corporation Tokyo Main Store (72) Inventor Hideto Iifuku Tokyo Central Ginza 8-21-1, Ginza Stock Company Takenaka Corporation Tokyo Main Store

Claims (1)

[Claims] 1. A flat bar formed to have a width and a thickness necessary for an outer stiffener ring and a length substantially equal to a circumferential length of a steel pipe,
Bending into a ring shape so that it can be fitted into the outer periphery of the steel pipe with a margin in a plane parallel to the plate surface, and fitting the ring-shaped object for outer stiffener formed as described above to the outer periphery of the steel pipe. Set at a predetermined mounting position, and bend the outer stiffener ring so that the inner peripheral surface thereof closely contacts the outer peripheral surface of the steel pipe at the mounting position, and finally the outer stiffener ring. Filled type steel pipe, which is characterized in that both end faces of the steel pipe are butted and joined together to complete a ring, and that the steel pipe and the outer stiffener ring are subjected to heat treatment mainly for the purpose of improving the relationship between stress and strain and removing residual stress. How to attach the outer stiffener ring to a concrete column.