Method and device for drilling a channel
US7337859B2 · kind B2 · utility
0Cited by
10References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 5, 2003 |
| Grant date | Mar 4, 2008 |
| Priority date | — |
| Expiry date | May 12, 2024 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/046
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
In a drilling method for creating a channel leading from surrounding soil into a shaft which is separated from the soil by a wall, a channel is drilled through the soil from a starting pit in the direction of the shaft using a first drill head. The first drill head continues to drill in this direction in order to create a breach in the wall, and a second drill head is then used in the shaft to widen the breach in the wall by drilling in the opposite direction with the second drill head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.