Method and apparatus for lining manhole assemblies and the like

Abstract From the Canadian patent

A manhole assembly and a method for producing cover sections for lining such manhole assembly are provided herein. The manhole assembly is comprised of a plurality of manhole sections stacked one upon the other. Each of the manhole sections is formed of a cast material and has liner means formed of a sheet-like semi-, rigid plastic material lining the interior surface of each manhole section. The liner means have integral anchoring projections, along their curved surfaces which engage the cast material the, integral, anchoring projections being imbedded in the cast material and having a configuration which anchors the liner means to the manhole section. The method includes the steps of …