Comacchio CH 650 CFA Ardenno
La CH 650 Comacchio, perforatrice multifunzione da 70 t, è impiegata nella realizzazione di pali CFA da 1.200 mm per due sottopassi ferroviari in Valtellina, su terreni limosi e incoerenti, con falda a 2 m e rischio di subsidenza. Configurata con sistema WPD e elica rinforzata a doppia parete, esegue in media 4 pali al giorno. Le operazioni includono trivellazione assistita, pompaggio del calcestruzzo e infissione di armature con tubazioni soniche, sotto supervisione RFI. Il cantiere è stato predisposto con piastre di sostegno per garantire stabilità operativa. Consegna prevista: dicembre 2025. The Comacchio CH 650, a 70-ton multifunction drilling rig, is being used for the construction of 1,200 mm CFA piles for two railway underpasses in Valtellina. The machine operates in silty, incoherent soils with a groundwater table at 2 meters and a high risk of subsidence. Configured with a WPD (winch pull-down) system and a double-wall reinforced auger, it achieves an average output of four piles per day. Operations include assisted drilling, concrete pumping, and reinforcement cage installation with sonic tubes, under direct RFI supervision. The site is equipped with support plates to ensure operational stability. Completion is scheduled for December 2025.

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