Corrosive Environment Forces Innovative Solutions In Denver

A manhole after rehabilitation.

• A saw cut in surface pavement was made to expose the perimeter of the existing manhole barrel;
• Excavating around the existing cone section allowed removal of the cone;
• The plug assembly was installed to manage wastewater flows;
• Existing coatings and liners were removed from base sections and the invert area;
• Complete surface preparation of base, benches and invert area by abrasive blasting and pressure washing;
• Base, benches and invert area were rebuilt with C 120 calcium aluminate mortar and applicable reinforcing bars;
• SewerShield 100 epoxy was applied to rebuilt portions of the structure;
• Plug assemblies were removed to restore flows to rehabilitated invert;
• The SewerShield composite manhole insert (barrel and cone section) was installed; inserts were specifically manufactured for each structure;
• Annular spacing between the existing structure and new composite insert were filled with hydrophobic polyurethane grout;
• Backfill around new composite cone sections was completed and paved surfaces restored;
• And last, coated surfaces were spark tested and visually inspected in the presence of a project owner representative to detect any pinholes, which were patched as necessary.

FOR MORE INFORMATION:
Fisher Company Inc., (970) 887-9006, www.fishercompanyinc.com
SewerShield by Environmental Coatings, (480) 984-7608, www.sewershield.com
Plug-It Products, (800) 575-8448, www.plugitproducts.com