Method of replacing mains
US4738565A · kind A · utility
80Cited by
16References
49Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 4, 1986 |
| Grant date | Apr 19, 1988 |
| Priority date | — |
| Expiry date | Aug 4, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T225/371
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A method for replacing an existing buried pipe of a crackable, fracturable material. By the application of a local intense pressure, the pipe is cracked and fractured into irregular fragments which are spread outwardly to provide space for a new replacement tubular assembly which is moved into the space as the pipe is fractured and the fragments spread. At least a portion of the outward spreading of the fragments occurs under the action of the intense local pressure. An apparatus used to carry out the method may be pushed and/or pulled through the existing main, and the pushing force may be applied by percussive action.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.