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  Industrialisation of the construction process for the Solbiate Olona tunnel by using “jet-grouting” technology

  The Solbiate Olona tunnel represents a very significant project, solving the problem of interference between the “Pedemontana Lombarda” Motorway alignment and one part of the Solbiate built area, overlooking the Olona Valley. After a long stretch of cut & cover tunnel, the tunnel passes underground through gravelly-sandy ground, beneath various residential buildings and existing structures with overburdens of around ten meters. The report describes the advance methods employed, developed according to the ADECO-RS approach, which made complete industrialisation of the construction process possible. A detailed examination of the “jet-grouting” technology employed in the ground is given. This was of great importance both in the construction of the tunnel, using sub-horizontal ground treatment, and for the construction of the portal on the Olona Valley side, where a wall to confine the slope was realized using sub-vertical ground treatment.

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