On March 3, 2016, a 12-foot wide sinkhole opened on Detroit’s west side on eastbound Tireman Avenue near Greenfield Road. According to the Detroit Water and Sewerage Department (DWSD) the sinkhole was caused by the collapse of a sewer pipe that connects to an interceptor underneath Tireman Avenue. A video inspection showed a connecting pipe had fractured over the interceptor into the Greenfield sewer on the west side of the intersection of Greenfield and Tireman. The surrounding soil (wet sand) entered the 7-foot-9-inch interceptor, thus creating the sinkhole. During the project, further inspection showed that a monolithically poured concrete secondary liner of the interceptor was severely corroded. DWSD contracted with its emergency responder: Inland Pipe Rehabilitation's Inland Waters Pollution Control or IWPC. IWPC is a Detroit-based industrial and environmental service firm whose 45 years of experience is built on the core belief that trenchless infrastructure solutions are critical to bringing the nation’s aging water and sewer infrastructure back to standard.
IWPC recommended using IPR’s EcoCast geopolymer lining system for the curved portion of the interceptor. IPR has the most comprehensive portfolio of innovative technologies currently available and is committed to continuing to develop and introduce “green” technologies. DWSD reviewed and approved IWPC’s proposal and preparations for the repair work began. To repair the straight section of the interceptor, IWPC utilized a 78-inch HOBAS pipe.
In May 2016, IWPC began the installation of deep wells to lower the water table around the interceptor followed by the construction of an access shaft. Once the prep work was complete the IWPC lining crew spray-applied the geopolymer to the new ribs and lagging. To repair the straight section of the interceptor, IWPC utilized a 78-inch HOBAS pipe and installed a new 24-inch ID ductile iron sewer from the newly built drop manhole (within the access shaft) to the existing manhole in the
North curb of Tireman street.
EcoCast combines installation and application equipment with a custom formulated geopolymer called GeoSpray®. It is an extremely versatile system developed explicitly for enormous structures. It has a high compressive strength, extremely high modulus of elasticity and high bond strength. It works in a wide range of temperatures and cures in a matter of hours.
After the preparation, it took approximately five days to install the EcoCast solution. Repairs were completed in late October 2016. Final pavement replacement and reopening of Tireman Street occurred on November 22, 2016. Installation of the new drop manhole cured the severe flow discharge of the connection, eliminating any future H2S issues within the sewer.