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  The biggest TBM/EPB in the world: a challenging experience

  The Sparvo tunnel is part of “Variante di Valico” highway project, between Bologna and Florence in Italy. This contract was acquired by TOTO Costruzioni Generali S.p.A for 190 Mio€. Here a mechanized method was applied by using the world’s largest TBM called “Martina”, with an exceptional diameter of 15.62 m. BASF contributed to the successful TBM tunneling at Galleria Sparvo by supplying superplasticizers and form release agents for the segments production, foams and anti-clay agents for the EPB soil conditioning as well as tail sealants for the secure sealing of the TBM tail shield. Due to the big TBM diameter and mixed face conditions at the cutter head, especially the demands regarding the efficiency of the soil conditioners, regarding material flow and cutter head torque, were extremely high. This article will describe in detail the challenges faced at this job site.

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