Tohid Tunnel

Towheed Tunnel Project is an urban underground structure, located within the area of Chamran Highway, Towheed Square, Jomhouri Square, and Navab Highway, with a length of about 3 km (Tunnel + entry ramps).

Tohid Tunnel broke construction records when it was opened in less than 30 months.

[1] It includes installation of utilities equipment in the Tunnel, and manufacture and mobilization of north and south fans combined ventilation equipment, and control building and Niyayesh shaft.

The construction site of this Project was located within the distance between Fatemi Ave. in the north of Towheed Square, and Navab Highway in the south of Azerbaijan street junction.

[2] Subsequent to studied on the Comprehensive Plan of Tehran, in order to make an easy access from the north to the south of Tehran and vice versa, along the north-south corridor, between Chamran Highway constructed during the 70s, and Navab Highway constructed during the 90s, sufficient studies were made by Tehran Municipality in 1998 so that the connection of the said two Highways, i.e. to fill the gap between Towheed Square to Jomhouri Square becomes practicable and operational.

4 axial fans (to let out exhaust air from Tunnel) powered at 500 KW.