Pregrouted PC steel material and curing method for pregrouted layer therein
US10323415B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2014 |
| Grant date | Jun 18, 2019 |
| Priority date | — |
| Expiry date | Apr 13, 2035 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04G21/12
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A pregrouted PC steel material (10) includes a 19-wire-twisted PC strand (1), a pregrouted layer (2) disposed on an outer periphery of the PC strand (1), and a sheath (3) configured to cover an outer periphery of the pregrouted layer (2). A filling resin (4) is filled between steel wires (side wires) (1b, 1c, 1d). Since the filling resin (4) does not exude to the pregrouted layer (2) before tensioning of the PC strand (10), an operation of tensioning the PC strand (1) is not hindered by curing of the pregrouted layer (2). In contrast, since the gap between the steel wires is reduced when the PC strand (1) is tensioned, the filling resin (4) flows out (exudes) from between the steel wires to the pregrouted layer (2) to cure the pregrouted layer (2) only after the reduction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.