Orlowski Tunnel under the Neva River-St. Petersburg


Nevskaia Konzessionnaia Kompania

Cost of works:

€ 1,100 million

Period of Activity:

2010 - 2010

The 1km-long road tunnel under the Neva River will establish a new connection between the river sides and it will reduce continuous traffic jam, thus improving the urban mobility conditions and allowing extension of bridges opening in the city of St. Petersburg. The project is launched by the City of St. Petersburg under a Public-Private-Partnership (PPP) scheme.

— Project Description:

The project presents some unique features and challenges in the realization of underground structures in urban areas. The tunnel shall be designed to allow access to public buses and emergency vehicles, motor cycles, and for cars and light goods vehicles up to 3.5 tons maximum allowable weight. The height of the traffic space (clear distance between the carriageway and any obstruction located in the upper part of the tunnel) within the traffic zone shall be 4.5m. All equipment in the road tunnel shall be placed outside of the traffic space. The road tunnel will be a single-tube tunnel with a diameter of 19.25m; there will be 2 levels for the traffic lanes (3 for each direction); the Cut&Cover sections at both river sides will host the TBM starting and arriving chambers and later the Cut&Cover box shaped road tunnel structures. The challenges of the project are the interferences in urban areas, the underpass of the river embankments, and the very poor soils in the mined section with low overburden.

— Description of Services:

Project appraisal (on the design proposal submitted with the tender); Risk analysis; Comparison of project alternatives; Feasibility Study and preliminary design of the tunnel.

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