Patent ID: 11894667
Assignee: PRYSMIAN S.P.A.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 9:
10. A method for installing a single power cable span in a tunnel having an entrance and an exit, the method comprising:
positioning a head portion of the single power cable span near the entrance; and
laying the single power cable span in the tunnel past the exit, the laying of the single power cable span comprising:
connecting a trolley at the entrance in a slidable manner on a rail longitudinally extending along the tunnel between the entrance and the exit,
joining the trolley to a pulling rope and to the single power cable span, and advancing the trolley along the rail by pulling the pulling rope by a predetermined length,
repeating the connecting, joining, and the advancing with further trolleys,
disconnecting a subset of the trolleys reaching the exit until the head portion reaches an endpoint outside the tunnel, and
when the head portion reaches the endpoint, locking at least one of the further trolleys nearest to the exit on the rail inside the tunnel.