Sibiu–Pitești Motorway, Section 4, Momaia Tunnel
Curtea de Arges, Romania / 10.2023 - 02.2026
The motorway between Sibiu and Pitesti is the first motorway link through the Carpathians. At the heart of the 10 km-long Lot 4 is the 1,350 m-long Momaia Tunnel.
Facts & Figures
Company
PORR Bau GmbH, PORR Construct S.R.L.
Type
Tunneling, Road construction
Runtime
10.2023 - 02.2026
First use of the NATM construction method in Romania
Commissioned by the Romanian motorway authority CNAIR, this major project – comprising a twin-tube tunnel with two lanes in each direction – is Romania’s first motorway tunnel to be constructed using the modern New Austrian Tunnelling Method (NATM).
The complex geology presented a particular challenge. Layers of unstable clay, silt and sand alternated with one another. This was ideal for the use of NATM, in which the surrounding rock is utilised as an active part of the support system. In addition to the tunnelling work, PORR was therefore also responsible for the internal formwork concreting as well as the control and safety systems.
This infrastructure project thus demonstrates not only PORR’s broad service portfolio, but also its innovative and precise construction methods – particularly in challenging conditions.
