Method of laying pipes in the ground
US4020641A · kind A · utility
19Cited by
5References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 22, 1975 |
| Grant date | May 3, 1977 |
| Priority date | — |
| Expiry date | Dec 22, 1995 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/28
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
There is disclosed a method of laying small-diameter pipes such as gas, water pipes or the like precisely in position in the ground. Small-diameter pilot pipes are first laid in with a pilot head being measured and controlled in order to make its advance straight. Pipes which are larger in diameter than the pilot pipes are then laid in successively, the large-diameter pipes being led by the pilot pipes. A multistage head is used as a head utilized for consolidation of soil and disposed in a following relationship to the pilot pipes, thereby reducing resistance exerted upon the head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.