Title:
外ダイヤフラムの製造方法
Document Type and Number:
Japanese Patent JP7054510
Kind Code:
B2
Abstract:
To provide a method for manufacturing an outer diaphragm in which a cross section thickness is uniform and a flat plate part (a flat part excluding a curvature part of a corner part) of an outer periphery which is a joint surface of a beam is large in the circumferential direction.SOLUTION: In a method for manufacturing an outer diaphragm 30 which is formed into a rectangular ring shape to be fitted to a joining position of a beam 20 to a square steel pipe column 10, a steel plate having a thickness T of 40 mm or more is formed into a cold rectangular steel pipe having a uniform inner radius of curvature at each corner by cold press molding; a cold rectangular steel pipe formed by cold press molding is formed by hot roll molding in a throttle shape so that its inner surface curvature radius becomes a prescribed inner surface curvature radius corresponding to an outer surface curvature radius r of each corner part of the square steel pipe column 10.SELECTED DRAWING: Figure 1
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Inventors:
Nakajima Isao
Nakajima Norio
Shin Nakajima
Hideki Kano
Nakajima Norio
Shin Nakajima
Hideki Kano
Application Number:
JP2017236556A
Publication Date:
April 14, 2022
Filing Date:
December 11, 2017
Export Citation:
Assignee:
Nakajima Steel Pipe Co., Ltd.
International Classes:
E04B1/24; B21C37/15; E04B1/58; E04C3/06
Domestic Patent References:
| JP2006016859A | ||||
| JP2012130930A | ||||
| JP4037413A | ||||
| JP2013174107A |
Attorney, Agent or Firm:
Morimoto International Patent Office
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