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:
Sep. 25, 2018
Filed:
Jul. 05, 2013
Sumitomo (Sei) Steel Wire Corp., Itami-shi, JP;
Sumitomo Electric Industries, Ltd., Osaka-shi, JP;
Takahide Saiki, Itami, JP;
Masato Yamada, Itami, JP;
Yoshihiko Touda, Itami, JP;
Takashi Ichiki, Itami, JP;
Kiminori Matsushita, Itami, JP;
Katsuhito Oshima, Itami, JP;
Jun Sugawara, Osaka, JP;
Shingo Nakajima, Osaka, JP;
Shuhei Maeda, Osaka, JP;
Sumitomo (SEI) Steel Wire Corp., Itami-shi, JP;
Sumitomo Electric Industries, Ltd., Osaka-shi, JP;
Abstract
Provided is a pregrouted PC steel material comprising a PC steel stranded wire composed of a plurality of steel wires, a pregrout layer disposed on the outer periphery of the PC steel stranded wire so as to accommodate the PC steel stranded wire, a sheath covering the outer periphery of the pregrout layer, and a capsule including a pregrout-hardening agent and a film with which the agent is covered, the capsule being interposed among the steel wires constituting the PC steel stranded wire. The capsule has a strength such that the capsule is not broken before tensioning the PC steel stranded wire but is broken by a tensile force during the tensioning. Also provided is a method for hardening the pregrout layer.