Method and apparatus for replacing old underground conduits
US7997559B2 · kind B2 · utility
1Cited by
5References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 7, 2007 |
| Grant date | Aug 16, 2011 |
| Priority date | — |
| Expiry date | Feb 17, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02G9/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a method and an apparatus for replacing old underground conduits (4), the old conduit (4) is first laid bare with the aid of a ground drilling device (8) with an overdrilling head and then, in turn, a new conduit (5) is drawn in with the aid of the drill rods (7) and at the same time—in a uniform operating step—the old conduit is pulled out of the ground.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.