The city Riga is a major seaport and a cultural and industrial centre with more than one million inhabitants. Due to economic growth the amount of traffic increases fast and the capacity of the existing river crossings is to low. To meet the expected traffic growth, a new Northern extension of the ring road was planned including a new river crossing with 2 x 3 lanes.
The Daugava Tunnel project is an 8 km highway link, starting at the east bank with an approach road of 2250 m with several junctions and connections to the existing road network, an immersed tunnel part with a length of approximately of 1300 m and an approach road on the west bank of the river of 4500 m, also with several connections and crossings with the existing road network. Both a concrete immersed tunnel as a steel shell tunnel was designed.
Design Engineer and Employer's representative for all the aspects of the project during the feasibility phase and the tender preparation phase, including:
The design works included the following: