Methods for measuring and modeling the process of prestressing concrete during tensioning/detensioning based on electronic distance measurements
US10203268B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | May 26, 2016 |
| Grant date | Feb 12, 2019 |
| Priority date | — |
| Expiry date | Jun 7, 2037 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04C5/08
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Methods are disclosed for nondestructive testing and measuring the structural health of prestressed concrete structures, such as slabs, columns, girders, bridges, towers, elevated storage tanks, silos, cooling towers, wind power generation towers, liquefied gas storage tanks, nuclear power containment buildings, and the like. Measurements are made as the structure undergoes tensioning and detensioning operations. By measuring actual movements of cardinal points on the structure, in an absolute three-dimensional coordinate system, and comparing the measurements to a model—as tension on a tendon is changed—a margin of safety is assured. High accuracy measurements are made by electronic distance measurement (EDM) instruments over hundreds of meters, which yield coordinates of cardinal points with an uncertainty of the order of one part per million. The methods are proposed as possible alternatives to prior failures of post-tensioned concrete, including the Las Lomas Bridge, the Kapiolani Interchange On-Ramp, Turkey Point Unit 3 Nuclear Power Plant, and Crystal River Unit 3 Nuclear Power Plant. An extensive review of the most closely related prior arts is included.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.