US 5,405,218 A · Method for the repair of existing manholes using elastomeric materials

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 elastomeric material.

Claims25

Dependent claims

A method for lining or relining an existing engineering structure to rehabilitate, reinforce, and protect the engineering structure, said method comprising

(1) preparing the surface of the engineering structure to be lined or relined by cleaning the brick, tile, concrete block, concrete, mortar, or metal forming the surface and removing loose particles of brick, tile, concrete block, concrete, mortar, or foreign material from the surface;
(2) applying a fast-curing elastomeric material to the prepared surface of the engineering structure to be lined or relined by spraying the fast-curing elastomeric material onto the prepared surface whereby a monolithic, continuous elastomeric coating is formed on the prepared surface, wherein the fast-curing elastomeric material is an isocyanate-initiated compound prepared by rapidly mixing and initiating the reaction of an isocyanate-terminated compound having at least two reactive isocyanate groups and an amine-terminated compound having at least two reactive amine groups immediately before spraying the fast-curing elastomeric material onto the prepared surface;
(3) allowing the fast-curing elastomeric coating to cure, whereby an elastomeric liner is formed on the prepared surface to rehabilitate, reinforce, and protect the engineering structure.

Dependencies are inferred from the claim text.

Method for the repair of existing manholes using elastomeric materials

Life of this patent

Method for the repair of existing manholes using elastomeric materials

Life of this patent

Abstract

Claims25