Building of the steel penstock belonging to the EDF hydroelectric plant of La Coche in Savoy (France) – Execution and construction design.

Steel penstock of inner diameter 2550 mm and thickness 58 mm, in a sub-horizontal tunnel, with blocked vertices and intermediate support pins, without movement joints.

Length of approximately 245 m and hydraulic drop of about 920 m.

The pipe starts from a fork-connection with the existing pipe, blocked in the rock, gradually passing from the existing penstock of inner diameter 2550 mm to the new pipe of inner diameter 2250. The fork has a thickness of 65 mm and is equipped with an axial reinforcing element and an annular one, of thickness 150 mm, tested at workshop with a pressure of 169 bar.

Services provided: Execution design and construction drawings for steel works and civil works.

Committente: PARESA S.p.A.

Site: Municipality of Le Bois, Arrondissement Albertville, Savoy.

Years: from 2016 to 2018

Cost of works: 10.0 million Euros