Trenchless Technology

NOV 2018

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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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