Method for the repair of existing manholes using elastomeric materials
US5405218A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 5, 1992 |
| Grant date | Apr 11, 1995 |
| Priority date | — |
| Expiry date | May 5, 2012 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE03F5/025
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
This invention relates to a method of repairing existing manholes and similar structures by applying a fast-curing elastomeric material using spray techniques whereby a homogeneous, non-porous, and monolithic coating or lining is formed. The fast-curing elastomeric material can be applied directly to existing concrete, brick, tile, mortar, and metal surfaces normally found in sewer manholes and catch basins, sewer and drainage pipes, parking decks, bridge piers and footings, holding ponds, bridge trusses, culverts, gratings, and the like and does not require any formwork. The elastomeric coatings provide effective surface protection against wear, corrosion, and water infiltration and can be applied in a single operation to horizontal, vertical, and overhead surfaces. The elastomeric materials are prepared by initiating the reaction of an isocyanate-terminated compound or polymer with an amine-terminated polymer or an aliphatic or aromatic diamine immediately before applying the elastomeric material to the surface to be coated. Preferably the reactive components (i.e., isocyanate-containing and amine-containing materials) are mixed directly in the spray gun used to apply the elastom…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.