Underground Construction Technology International Conference & Exhibition

This successful project involved the rehabilitation of 15,000 LF of 70 to 100 year old cast-in-place reinforced concrete non-circular sanitary sewers using a Grouted-In-Place Lining System (GIPL) to provide increased structural stability, a water tight and corrosion resistant lining and improved flow capacity. The project in Washington for the DC Water and Sewer Authority involved 7 different sewer sizes from a 7'x11' box to a 10'x10' thumbnail shaped arch, 8 transition sections between different shaped sewers, limited and restricted access through high security military bases, small manholes (3'x3'), lining around curves, five sections that were 1,200' to 1,700' between access points, structural design of lining system and storm event inundation issues.