Method and apparatus for sewer and manhold repair
OwnerGilbert Lee Oldfieldinventor
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Abstract
A complete system and method can be used for the repair and sealing of a sewer manhole. The process of the present invention includes surface preparation with steps to purge out embedded contaminants, application of a primer to the prepared and purged surface, application of a closed cell foam layer over the primer layer, and application of polyurea layer disposed on the foam layer. By first making sure the concrete is purged of contaminants, the system, when applied, cannot be damaged by the outgassing of contaminants from the coated concrete as may be possible with conventional systems. Moreover, the system of the present invention uses a 100% polyurea coating that provides appropriate flexibility, strength, and chemical resistance.
Claims20
A coating system for a concrete or brick surface, comprising:
- a surface preparation material applied to the concrete or brick surface;
- a primer layer applied to a surface prepared concrete or brick surface;
- and
- a polyurea layer applied to the primer layer.
A repair system for an existing concrete or brick surface, comprising:
- a purge treatment applied to the concrete or brick surface;
- a primer layer applied to a surface prepared concrete or brick surface to a thickness from about 3 to about 5 mils;
- and
- a polyurea layer applied to the primer layer to a thickness from about 50 to about 80 mils.
A method for repairing manholes comprising:
- applying purge treatment to a concrete or brick surface of the manhole;
- applying a primer layer to a surface prepared concrete or brick surface;
- and
- applying a polyurea layer to the primer layer to an exterior thickness from about 50 to about 80 mils.
Dependencies are inferred from the claim text.