Title:
MECHANICAL JOINT, STEEL PIPE WITH JOINT, METHOD OF MANUFACTURING STEEL PIPE WITH JOINT, STRUCTURE, METHOD OF CONSTRUCTING STRUCTURE, AND METHOD OF DESIGNING MECHANICAL JOINT
Document Type and Number:
WIPO Patent Application WO/2022/270263
Kind Code:
A1
Abstract:
The purpose of the present invention is to reduce the push-in load required for fitting without causing an increase in machining cost and a reduction in strength. A mechanical joint 1 according to the present invention comprises an inner joint pipe 5 and an outer joint pipe 7, and comprises split pieces 11 capable of flexing in a radial direction, a projecting part 13, an engagement part 17, and a guide part 19. The split pieces 11 are grouped into a plurality of groups that satisfy the following conditions (1) and (2), and are configured to reach a maximum flexure in a fitting process at different timings between the split pieces 11 in the same group. (1) The split pieces that belong to the same group have the same axial position at which the maximum flexure is generated at the guide part, and the axial position varies between different groups, and (2) the split pieces that belong to the same group form, when the circumferential centers of adjacent ones are connected with a straight line, a straight line passing through the center of the pipe or a polygonal shape the center of gravity of which coincides with the center of the pipe.
Inventors:
ICHIKAWA KAZUOMI (JP)
Application Number:
PCT/JP2022/022435
Publication Date:
December 29, 2022
Filing Date:
June 02, 2022
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
E02D5/24; F16L37/133
Foreign References:
| JP2004036329A | 2004-02-05 | |||
| JPH08312863A | 1996-11-26 | |||
| JPS5760929U | 1982-04-10 | |||
| JPS544411A | 1979-01-13 | |||
| US7097211B2 | 2006-08-29 |
Attorney, Agent or Firm:
SAKAI INTERNATIONAL PATENT OFFICE (JP)
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