Method of lining passageways by applying a pre-liner sleeve and hardenable composition
US5656117A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 1994 |
| Grant date | Aug 12, 1997 |
| Priority date | — |
| Expiry date | Oct 17, 2014 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L55/1654
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A method of lining passageways, or pipelines, employs a pre-liner sleeve formed of a thin plastic material, which is applied to the inside surface of the passageway to be lined. During application of the pre-liner sleeve, it is held in a concertina-like folded condition in a magazine which is moved along the passageway by operation of air pressure which is applied from within the pre-liner sleeve, and which simultaneously inflates the pre-liner sleeve so that it communicates with the inside surface of the passageway. A spray head follows the magazine from within the inflated pre-liner sleeve and applies a hardenable composition, such as mortar, to the inside of the inflated pre-liner sleeve. The spray head is followed, in some embodiments, by a tube which is everted to communicate with the applied hardenable composition under air pressure. The tube holds the applied layer in position while it cures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.