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Sprayed-in-Place Pipe (SIPP) and Bypass pumping
As the prime contractor, Michels was responsible for the rehabilitation of approximately 1,460 linear metres of a sanitary trunk sewer. The trunk sewer was accessed by only two manhole shafts, one 40m deep and the second at over 50m deep. The construction sites were located within a park where crews worked and entered the shafts. The main construction site was adjacent to a high school with over 1,500 students and a lot of car and bus traffic.
Utilizing a 100mm thick structural geopolymer layer, effectively a pipe within a pipe, the project team overcame challenges related to working in live sewer conditions throughout the project including the installation of dual 2642mm diameter sewer plugs, plus installing, operating and maintaining five NPS 12 hydraulically driven bypass pumps. Diligence of the entire workforce ensured that zero sewer product was spilled and the team implemented and achieved environmental compliance higher than industry standards. Extreme groundwater pressure leaks were mitigated through the use of topical and injection grouting. Michels sets out very high safety, environmental and quality standards and because the project team exceeded these expectations, they received accolades from both the project Owner and the high school.