Method and apparatus for installing a duct around a longitunal member present at the stretch of installation
US6824329B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 11, 2003 |
| Grant date | Nov 30, 2004 |
| Priority date | — |
| Expiry date | Apr 11, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02G1/08
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
For installing a cable duct around a cable buried in the ground, the duct is propelled by a propelling device formed of a solenoid and a corresponding core member of a magnetic material, and a duct transporting device. The core member is provided with a coupling which couples to a free end of the cable. The solenoid is driven by a current so as to maintain, during operation, the free end of the longitudinal member, coupled to the core member, in a fixed position with respect to the transporting device. The propelling operation is supported by feeding a fluid under pressure through the duct, with the foremost end of the duct being provided with a spouting member. Suitable design of the core member in combination with a suitably varying current for driving the solenoid allows increased dynamic propelling operation and consequently improved performance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.