چهارشنبه 09 آذر 1401 - 2022 Nov 30
Tehran - Shomal freeway Company
Tehran - Shomal freeway Company
About Lot One

Route Of Lot One:

 

  • This lot begins at the intersection of Azadegan highway and Shahid Hemmat highway, passing through Kan, Suleghan, Imamzadeh of Aqil, Talon tunnel and Laniz valley and finally enters Shahrestanak Y track.
  • The distance between Tehran and Do Ab is about 32 km that consists of two way lanes and a slow lane in the slopes joins the route. The maximum road slope is 6 percent and the minimum radius of arcs is 450 meters.
  • Construction of this section removes a part of the current route passing through Karaj and shortend the  current route by about 60 km. 

                                                         

 

Main operational volumes of lot one On Round Trip Basis:

 
  • 40  Tunnels with 32 Km length
  • 25  Bridges with 3.1 Km length
  • 12  Million m3  earth works
  • 42% of the route (13.5 km) consists of tunnels
  • 20 kilometers of retaining walls with a variety  of weights, sheet piles and reinforced soil.
  • Using special electromechanical installations to make the route smart
  • Architectural designing and implementing road safety
 

Talon Long Tunnels:

 

The Talon Tunnel Complex is comprised of 32 main, service, and connecting tunnels. Apart from the two main  tunnels, each of which is 4870  meters long (more  than  two and a half times the length of the Kandovan tunnel on the current Karaj-Chalus road) , this Complex has a third tunnel between the two main tunnels that was used as an access tunnel for excavating the two main tunnels and after operation it is used as an emergency service tunnel .

Each of the Talon Tunnels’ tubes are connected by 9 separate cross headings as rescue tubes for vehicles.

The main  tunnels are also connected to the  service tunnel via 20 small tubes which are used to evacuate the passengers from  main tunnels in emergency .

Another unique feature of Talon tunnels is the semi-transverse ventilation system. The second ceiling of this tunnel, 10-kilometer long in total, is equipped with automatic valves  and  powerful jet fans to ventilate the main tunnels. These  valves open when needed, such  as the times  of firing. In such an event smoke is emitted and the air pressure is managed to prevent the spread of fire and polluted air throughout the tunnel.

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