Tohid Street Tunnel is a project of Tehran Municipality for the purpose of connecting Chamran and Navab Expressways and also for resolving Tehran’s Northern and Southern traffic ring roads (as the completion of the North Expressway to the South of Tehran) planned the Tohid Road Tunnel as an inner-city twin tube tunnel with the length of 1.98 km and with two ramps of total length of 840 m oriented in a north and south direction to be constructed.

An approximate 300 m² cross section underground excavation ends up into two twin concrete lined tunnel. Each tube has a three lines unidirectional traffic with the area of 85 m² and diameter of 9.7 m.

This is the largest city tunnel in Tehran which passes under the heavy traffic streets of Tohid, Azadi and Jomhori to reduce traffic load from North to the South direction, omitting traffic jam on the cross sections of the South-North directions with these streets and finally facilitates a very easy access between northern and southern parts of the city centre of Tehran.

• Total project costs: approx. 130’ million CHF

Client

Maram Construction Group, Iran, Tehran: Tohid Tunnel

Challenges

The soil conditions and the construction methods were big challenges that had to be mastered. The Persian tunnel construction method is very different from the European and international standard construction methods. In some cases, construction methods are used that are thousands of years old and must first be assessed from an international engineering perspective and classified as suitable.

This could only be mastered if the Project Manager and the local project and construction management worked hand in hand.

My role/position in the project

Senior Project and Contract Manager General Contractor side, responsible for:

• Project Management and team lead of 6 experienced engineers
• Quality/Time/Cost management
• Contract management and negotiations
• Contact person for Tehran Municipality and other parties involved

Time duration project work

2008 - 2010

Images