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  269 Innovations Applied in the Design and Construction of the Arroyo Vega Flood Relief Tunne

  This paper aims to present experiences and innovations implemented in the flood relief project “Segundo Emisario del Arroyo Vega”, part of Buenos Aires city hydraulic master plan. Works comprised the execution of an 8.4km-long tunnel for relief of the existing sewer network. Tunnel alignment develops in a highly populated area, with important interferences such as two metro lines, three railway lines and a main potable-water tunnel. All tunnel sections extend mostly within firm, silty soils. Overburden varies between 15 and 25m. The downstream section was executed with a 6.1m-diameter EPB-TBM, launched from a 35m-diameter shaft with water table pressures up to 200kPa. Break-in was performed across a watertight, plastic diaphragm wall cell, which allowed safe shaft wall demolition, avoiding use of startup sealing ring, resulting on a very safe TBM launch. The tunnel upstream section, 2.85m in diameter, was executed using Pipe Jacking techno logy, with the peculiarity of using two-directional launch shafts along its alignment. In order to allow water entrance from existing system –through flow diversion chambers– into the new relief tunnel, openings were made in the TBM tunnel, with connection areas of 4 to 7m2. Its design was particularly challenging, given that unbolted segmental lining was used.

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