Installation of cured in place liner with inner impermeable layer and apparatus
US7112254B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 7, 2003 |
| Grant date | Sep 26, 2006 |
| Priority date | — |
| Expiry date | Jan 30, 2024 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C63/34
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for installation of a resin impregnated cured in place liner with an inner impermeable layer is provided. The liner is formed from a resin impregnable material having an impregnable layer bonded thereto. The material is formed into tubular shape with the impermeable layer on the outside of the tube about a tubular forming member and continuously everted into the tubular forming device to place the impermeable layer on the inside. An outer impermeable wrapping can be applied after wetting out the inner tubular member. A pull-in fitting with a steam connection is inserted into the leading end of the liner and the liner is pulled to an installation access. Prior to reaching the installation access a receiving canister with steam connection is attached to the end of the liner and pull-in completed. This permits inflation of the pulled in liner with an air curing of the resin with steam. All steaming is done below grade with minimal entry to underground access points.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.