The Markovec Tunnel
Investment value: € 65.600.000
Role: Project design, project leadership
Year of the design of the technical documentation: 2007 – 2010
Predor Markovec
Konstrukcija predorske cevi
Project description
The Markovec Tunnel is a two-tube road tunnel on the Koper - Izola expressway. The expressway in the two-tube, two-lane tunnel runs from the cliff face of the Markovec slope on the Koper side to the end of the Pivol stream valley on the Izola side. The length of the right tube (Koper - Izola direction) is 2,144 m and the length of the left tube (Izola - Koper direction) is 2,174 m. The transverse inclination of the carriageway is between 2.5% and 3.5%. The carriageways are 3.50 m wide and the shoulders are 0.35 m wide. The total width of the clear useful opening is 7.70 m. The vertical height of the carriageway clearance is 4.70 m. The tunnel was opened in July 2015.
Technical features
The tunnel passes through flysch rock in its entirety. The tunnel tubes were constructed using the New Austrian Method, with an excavation profile of 92 square metres and a vertical clearance height of 4.7 metres. The excavation of the top heading was carried out with jackhammers and blasting. At the entrance to the tunnel from the Koper side (eastern portal), the gallery is largely filled in alongside both tubes, with an open structure on the right. On the right side of the right tube, there is a platform for the power supply station. At the exit of the tunnel on the Izola side (west portal), the cut and cover, of the same clearance as the tunnel, is backfilled with embankment material; the structure is not visible. The slopes on both sides of the open route in the tunnel area are protected by gravity walls. There are horizontal panels (shadow walls) in front of the portals of both tubes. On the left side of the left tunnel tube, there is a platform for the power supply station.
Participating designers and project organisations
Elea iC d. o .o., IBE d. d.