Pregrouted PC steel material and method for hardening pregrout layer thereof
US10081943B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jul 5, 2013 |
| Grant date | Sep 25, 2018 |
| Priority date | — |
| Expiry date | Jun 6, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31678
- WIPO fieldCivil engineering
- WIPO sectorOther fields
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.