A43 – Autoroute de la MaurienneDesign and construction management

Lieu : France

Client : Société Française du Tunnel Routier du Fréjus (French Fréjus Road Tunnel Company)

Date : 1992 - 2000

Le projet

The A43 project involved building a 63.5 km section of freeway in the Maurienne valley, between :

the Montméliant – Alberville motorway section (A43/A430),
and the Fréjus Road Tunnel.

The section (34.5 km) built under SETEC’s supervision is the upper section of the Maurienne freeway, located in a particularly difficult mountainous area with many complex constraints:

hydraulic constraints (flooding of the Arc and mudflows from tributary torrents),
geological and geotechnical constraints (slope stability, boulder falls, etc.),
urbanization of the valley,
numerous interferences with existing structures: trunk roads, railroad lines, EHV power lines, hydroelectric reservoirs and tunnels,

This section includes :

2 3-lane tunnels, 3,700 m and 360 m long,
37 engineering structures, including 19 viaducts over 100 m long,
2 full diffusers and 2 half diffusers,
20 km of national (RN6), departmental and communal road restoration.

34,5km

37ouvrages d'art

fortes contraintes hydrauliques et géologiques

Nos missions

The project owner, SFTRF (Société Française du Tunnel Routier du Fréjus), has awarded SETEC a main project management contract for the structures and equipment in the upper section of the project, including :

- a study mission including the establishment of :
  - preliminary motorway project files (APA),
  - preliminary and pre-project design files for non-standard engineering structures (EPOA and APOA),
  - files relating to road restorations,
  - tender documents (DCE),
  - tender analysis reports,
  - market files,
- a works supervision mission focusing in particular on :
  - general supervision of works and contractors’ working drawings,
  - acceptance and settlement of work,
  - drawing up and handing over, at the end of the project, the “dossier des ouvrages exécutés”,
additional tasks relating to data collection, prevention of natural and industrial hazards, network relocation by concessionaires, etc.