Tunnel-driving apparatus
US4355924A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 26, 1980 |
| Grant date | Oct 26, 1982 |
| Priority date | — |
| Expiry date | Aug 26, 2000 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D9/0692
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Apparatus for use in driving tunnels or the like has a main shield composed of elongate drive members supported and guided on a rigid frame as known per se. Rams serve to advance the drive members and the frame in alternative to effect the driving operation. A rear shield or cover is located behind the main shield. This rear shield is composed of elongate rear extension members connected with some of the drive members over the roof and part of the side walls of the tunnel. Supports fixed to the rear of the frame of the main shield engage beneath the lowermost rear extension members to support the rear shield. The supports, disposed symmetrically at either side of the axis of the tunnel, have brackets engaging with the lowermost rear extension members and these brackets can be displaced by piston and cylinder units to raise or lower the entire rear shield.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.