Artificial and natural structures impregnated by using a flexible, fluid impermeable covering
US4169909A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 25, 1977 |
| Grant date | Oct 2, 1979 |
| Priority date | — |
| Expiry date | Oct 25, 1997 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04G23/0211
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Voids in at least a part of an artificial or natural structure adjacent an exposed surface of the structure are filled with hardenable material to strengthen the structure by closely fitting over the exposed surface a flexible fluid-impermeable covering having adjacent its boundary edges an endless hollow wall that surrounds and opens towards said covered surface and sealing boundary edges of the covering to the structure to form a substantially fluid-tight enclosure incorporating the hollow walls. Air and any other fluid is evacuated from the hollow wall and from voids adjacent said covered surface and hardenable material in a liquid or semi-liquid state is allowed to enter into the evacuated voids until the hardenable material appears at openings of voids in said covered surface. The hardenable material is then allowed to set.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.