Tubular liner for rehabilitating defective sewers
US9334998B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 25, 2013 |
| Grant date | May 10, 2016 |
| Priority date | — |
| Expiry date | Aug 2, 2034 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE03F2003/065
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A tubular liner for rehabilitating sewers includes a circumferentially expandable reinforcing layer impregnated with a light-curable reactive resin, and an outer tubular film surrounding the reinforcing layer and formed of a radially expandable material impermeable to UV light, in particular a liquid-tight and gas-tight plastic film. The tubular liner can be pulled into a sewer to be rehabilitated and can be expanded, in particular by using compressed air, so that the reinforcing layer and the outer tubular film contact the inner wall of the sewer before the reactive resin is cured. A protective tube made of a tear-resistant material is disposed around the outer tubular film and has a connecting portion extending in the longitudinal direction of the outer tubular film and being expandable in the circumferential direction by introducing compressed air into the tubular liner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.