Method and apparatus for lining manhole assemblies and the like
US4751799A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 9, 1986 |
| Grant date | Jun 21, 1988 |
| Priority date | — |
| Expiry date | Jul 9, 2006 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02D29/125
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Method and apparatus for providing liners in manhole assemblies, which liner is comprised of a plurality of liner sections joined together to form the inner corrosion resistant surface of each manhole member. The liner section define the inner surface of the manhole member being molded. Cast material is poured into the mold and allowed to set. The liner surface engaging the cast material contains integral substantially T-shaped projections which anchor the liner sections to the cast member. The tops and bottoms of each liner section extend around the surface of the section engaging the next adjacent section joined thereto to prevent toxic materials from reaching a cast material. The liner sections are theroplastic vacuum formed whereby the sheet forming the liner section is drawn against substantially T-shaped strips arranged upon the mold member within the vacuum thermo-forming equipment to provide the aforementioned integral T-shaped anchoring projections.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.