IT - EN

Laying of 132 kV underwater power line

We carried out the laying of the new 132 Kv underwater power line in the Venice lagoon.

Client: Terna Rete Italia
Commissioned: Prysmian Powerlink

The power line was laid in two distinct sections:

one that connects Sacca Serenella to Cavallino Treporti in the northern area of the lagoon (length of the track: 10.50 km - 42 km of cables)
the second, most southerly, from Fusina to Sacca Fisola (route length: 5.20 km - 20.80 km of cables).

The overall length of the entire route is 15.70 km for a total of 62.80 km of laid cables.

Special features of the construction site

Installation in areas with very shallow depth and high environmental value
Simultaneous underwater installation in the trenches of a triad of power cables and of an optical fiber cable at a burial depth varying from -2.00 m to -3.00 m compared to the share of the natural background
Overall track length: 15.70 km
Total length of laid cables 62,80 Km
Maximum length of the ground pull within TOC (Controlled Horizontal Drilling) 900 meters per single cable

Duration: 4 months

The project envisaged the simultaneous installation of three single-pole power cables and a telecommunications fiber optic cable joined in a single bundle without causing interruption of existing services, without closing the navigation and with the realization of the least possible number of junctions between the cables.

Video RAI TGR Veneto (16 June 2018)

Activities performed

Pull of the cables on the ground within TOC (Controlled Horizontal Drilling) with controlled pull winch and data recording
Controlled underwater laying of a bundle of 4 cables using cable laying machine with system "Green Trenching"
Realization of all the signaling works of the new power line
Realization of all complementary works for the crossing without interruption of existing services.