Apparatus and process for improved manufacture of shells for tunnel tubes
US4406150A · kind A · utility
1Cited by
3References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 23, 1981 |
| Grant date | Sep 27, 1983 |
| Priority date | — |
| Expiry date | Apr 23, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02D29/073
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
This invention relates to improved apparatus and process for manufacture of tunnel modules and tunnel sections used to build underwater tunnel tubes. A collapsible fixture is situated to roll up flat steel plate into a circular shell for the tunnel modules. A hydraulic cylinder is utilized to adjust the diameter of the fixture without collapsing it, in order to close any gaps between the ends of the plate when it is rolled into a shell.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.