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

Claim 0:
1. 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;
laying the single power cable span in the tunnel past the exit, the laying of the single power cable span comprising repeating a plurality of sub-steps until the head portion reaches an endpoint outside the tunnel, the plurality of sub-steps 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,
moving the trolley along the rail by pulling the pulling rope by a predetermined length,
after moving the trolley by the predetermined length, connecting another trolley on the rail and joining the another trolley to the pulling rope and to the single power cable span and moving the another trolley along the rail by pulling the pulling rope by the predetermined length, and
disconnecting, at the exit, the trolley from the pulling rope and from the single power cable span and removing it from the rail; and

when the head portion reaches the endpoint, locking at least the trolley nearest to the exit on the rail inside the tunnel.