Trenchless Technology

OCT 2018

Trenchless Technology is the premier communications vehicle for the trenchless industry. Through our multiple platforms, readers receive insights into the trenchless industry, as well as keep connected to the latest news, products and projects.

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Page 37 of 91

38 T R E N C H L E S S T EC H N O LO GY O C TO B E R 2018 LO C AT E D I N T H E H E A R T O F M I N N E A P O L I S, Minnestota , at the busy off ramp from Interstate 35 and the terminus of Highway 65, a few blocks away from US Bank Stadium and the downtown •inancial district , is the historic Francis Drake Hotel . Built in 1926, the Drake Hotel was initially constructed as a luxury hotel; it now serves as a temporary residence for homeless families and individuals. Despite its age, neither the hotel nor its underground infrastructure had ever been updated. In early summer 2017, a sink hole was discovered below 5th Avenue South, caused by a failure in the hotel 's side sewer and its connection to the mainline. This sink hole presented a major problem for the traveling public as thousands of cars rely on this corri- dor daily. To make matters worse, a nearby bypass tunnel , which allows traf•ic to avoid the downtown area, had also been partially closed for un- related repairs and maintenance. This forced even more commuters onto 5th Avenue South, the site of the sewer failure. Moreover, the cost for a tradi- tional open-cut rehabilitation method was estimated to be approximately $45,000 for this single repair and take several days to complete, disrupting nearby businesses. Decision-makers from the City of Minneapolis deter- mined that an extended closure of 5th Avenue South 5th for an open-cut ex- cavation to replace the side sewer and mainline connection would not be possible. In situations like this, sewer agencies tend to take a keen interest in options available through the use of trenchless technologies, which is the use of methods and equipment to renew or replace existing underground infrastructure with minimal disruption to surface traf•ic, business or property. In this case, the City of Minneapolis was no exception, and city sewer maintenance supervisor Sean Oberg , who worked as a facilitator with the Drake Hotel , reached out to LMK Technologies regional sales manager Pete Dannenberg . Based in Ottawa, Illinois, LMK Technologies has been offering trenchless cured-in-place-pipe (CIPP) lining solutions since 1993 and was known to Oberg as an innovative problem- solver. Oberg explained that the mainline pipe was a unique oval shape, and 18 in. in diameter, making By Cody Delmendo and Eric Sullivan T R E N C H L E S S T E A M E F F O R T Y I E L D S S U C C E S S I N D O W N T O W N M I N N E A P O L I S Unique Rehabilitation of an 18-in. Oval Main Lateral Connection

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