The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 16, 2018
Filed:
May. 15, 2015
Jfe Engineering Corporation, Tokyo, JP;
Nobuhiro Hasegawa, Tokyo, JP;
Toshio Imai, Tokyo, JP;
Hiroshi Nagamine, Tokyo, JP;
Hayato Nakazono, Tokyo, JP;
JFE ENGINEERING CORPORATION, Tokyo, JP;
Abstract
A buckling pattern steel pipe for being buried in ground in which flexure occurs includes: a steel pipe straight portion; and a buckling pattern portion. The buckling pattern portion is in a shape expressed by a sine wave determined based on: a buckling wavelength which is 2.05 to 4.32 times a compression local buckling half wavelength expressed by 1.72√(r·T); and a crest height expressed by a value 8.00 to 16.25 times a pipe thickness of the steel pipe straight pipe portion, and the buckling pattern portion absorbs bending compression deformation caused by faulting of the ground and axial compression deformation caused by the flexure so as to avoid deformation of the steel pipe straight pipe portion, where r is a pipe thickness center radius of the steel pipe straight pipe portion and T is the pipe thickness of the steel pipe straight pipe portion.