Trenchless Technology

NOV 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 44 of 68

44 T R E N C H L E S S T EC H N O LO GY N OV E M B E R 2018 W I T H N EA R LY 65 M I L L I O N passengers using its services each year, Frankfurt Airport , in Frankfurt , Germany, can't just shut down for main- tenance. However, after 40 years of increasing footfall, the airport's vast sanitation infrastructure was in danger of falling into a critical state. Heavy use had exacerbated nor- mal wear and tear, leading to cracks, pipe offsets, corrosion and multiple unflushable deposits. With the clock ticking down, the airport authority led a charge to repair or replace the waste- water network at Frankfurt Terminal 1 and contracted Germany 's ANT GmbH to manage the project . ANT sought support from Trelleborg Pipe Seals, a provider of pipe renovation systems with coverage across Europe and the United States. With a vast spiderweb of pipes lying directly beneath the ter- minal 's buildings, this would be no simple project for either firm. A Disruption-Free Zone Condensed within a confined area, and often expanded at various points through the years, airport wastewa- ter infrastructure is notoriously chal - lenging . Frankfurt Terminal 1 is no different : Since construction in the early 1970s, multiple extensions and conversions have created a complex wastewater system comprising a mix- ture of pipe sizes. These range from 4 to 16 in. in diameter, with 4-in. pipes predominating and 2.5-in. ver- tical downpipes also occasionally in use. Certain parts of the network are extremely hard to reach, having been overbuilt by newer parts of the termi- nal . Diameter changes and bends are commonplace, especially where the system had been altered to connect sub -networks, pumping systems and inspection manholes. What 's more, much of the piping is buried under- neath second basement level thor- oughfares, which have a height clear- ance of just seven feet . This restricted the type of machinery that could use to carry out the rehabilitation. Moreover, to prevent future recur- rence, the ANT-Trelleborg team needed be able to deliver a watertight, long- lasting answer to the problem. The chosen repair method also had to com- ply with the airport's strict sustainabil - ity targets, meaning minimal carbon emissions or environmental pollution. The atmospheric dust pollution and potential groundwater contamination created by open-cut methods was not an option. Most importantly, however, the rehabilitation needed to cause as little disruption as possible to the half- a-million passengers passing through the airport each week. This meant that no trenches could be dug. A Three-Pronged Solution Recognizing the scale of the task in front of them , ANT selected a cured- in-place pipe (CIPP) lining technolo - gy, provided by Trelleborg . The solu- tion would also include patch repair methods, as well as technology for repairing lateral connections, which would enable the airport 's wastewa- ter pipes to be rehabilitated entirely from the inside. The project schedule was carefully planned in coordina- tion with the airport authority. To W H E N T R E N C H L E S S K E P T F R A N K F U R T F L Y I N G How a Trenchless Wastewater Repair Saved the Day for One of Europe's Largest Airports By Mark Yanzo

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