Method and apparatus for supporting the wall of an upwardly excavated shaft
US4207016A · kind A · utility
1Cited by
5References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 23, 1978 |
| Grant date | Jun 10, 1980 |
| Priority date | — |
| Expiry date | May 23, 1998 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D5/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
There is provided a method and apparatus for supporting the wall of an upwardly excavated shaft. Cylindrical support frames which are successively thrust up through the shaft are respectively composed of several arcuate members and one or more disjointing members. A plurality of top supporting plates are provided on the top of the series of the cylindrical frames and are designed to fall inwardly toward the center of the shaft after the excavation of the shaft is terminated, thus constructing an umbrella like device for supporting the roof of the shaft.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.