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  The Riser Concept: vertical upward pipe jacking from inside an underwater Tunnel

  Pipejacking is a well-known technique that is traditionally adopted for horizontal and sub-horizontal applications. However, jacking pipe segments vertically and from inside an underwater tunnel, which was never made before, required the development of a new construction methodology. The method, known as “Riser Concept”, has been developed to build vertical risers by excavating and jacking upward pipe segments, in underwater conditions. The main requirements and objectives pursued to develop this solution were: ensure reliable and robust work program, improve constructability, minimize environmental impacts, reduce risks, and enhance safety. This pioneering construction method, safer and more efficient, was put in practice and proved solid when successfully applied for the first time in the outfall project Riachuelo Lote 3 (Argentina). The paper will discuss the key construction features and the relevant design solutions of the new method. Focus will be made on the construction phases and operative aspects experienced during the execution of Riachuelo project.

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