Florence rail bores for Seli

摘要

Sell has been awarded a subcontract to use an EPBM to drive two tunnels for a High Speed-High Capacity rail scheme in Florence, Italy.rnA 9.4m diameter EPBM will be used to bore twin, 5.5km long tubes on the north-south section between Florence Rifredi and Florence Campo di Marte. It is to drive northwards, be dismantled at Rifredi and returned to campo di Marte for relaunch.rnGeology along the alignment comprises alluvial sediments, lake deposits and clay. The bores willrnbe lined with 8.30m i.d. segmental rings (6+1) of 400mm thickness.rnThe twin tunnels are to be linked by 13 cross passages spaced at 410m-490m intervals.rnThe main contractor on the project is the Nodavia JV, which includes Coopsette, Ergon Engineering and Contracting Consorzio, and Coestra.