Method of excavation and apparatus therefor
US4838614A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 22, 1988 |
| Grant date | Jun 13, 1989 |
| Priority date | — |
| Expiry date | Jan 22, 2008 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D9/1026
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A tunnel is constructed by progressively cutting away a predetermined depth of rock from a face using rotary diamond saws. Slots are cut into the face (12) at an acute angle to the face such that first slots intersect second slots to detach blocks from the face. In one embodiment, the cutter (29) is mounted on a slide which can traverse an elongate guide 26. The guide is carried on an arm (24) which can swivel about its own longitudinal axis. A series of angularly spaced slots are cut into the face through 360.degree. with alternate slots being cut at opposite acute angles to the face so that they intersect. A cylindrical tunnel is produced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.