Tehran Subway Line3

  • Client: Tehran metro CO
  • Project location: Tehran, Iran
  • Design start date: 2009 Mar
  • Construction start date: 2016 Feb
Tehran Subway Line3



EPC Constractor:

Boland Payeh company

Project status up to now:



Line 3 of Tehran subway is the longest metro line in Middle East with 37 km long. This line will facilitate transport of 14 million residence of metropolitan Tehran by increasing the capacity of passengers’ transportation up to 2 million per day and help to reduce air pollution and traffic. Bolandpayeh’s contract engineering services in line 3 of Tehran subway was started in 2009 by TTBP. This project includs 15 km tunnels, 15 km tracklaying, 12 underground passengers’ terminal, 10 ventilators, 1 T-Junction & 3 drain networks. New Austrian Tunneling Method (NATM) for metro tunnel and pile and rib network of primary structure for under for underground terminal was chosen for this line. Main advantage of this method is its step by step excavation which leads to change in soil formation and improves soil stability and loading capacity, while its main weakness is its slower advancement rate compared to the other methods. In order to solve NATM disadvantage, TTBP develop a resource paln, which helps Bolandpayeh using formworks in series and parallel patterns and utilized special mix design.As a result Bolandpayeh successfully achieved average advancement rate of 30 meters of tunneling (including excavation and temporary and permanents structures) per day and 80 m per day for track laying which are beyond what other companies have achieved in Iran. This results led to all project constraint dates to be met. With creative and specific design which was done by TTBP, the construction duration of underground stations successfully reduced up to 30%, using construction of platform ceiling slab at ticket hall floor slab elevation and then excavation of the passenger platform. As of August 2016, the progress of the project has been 95%. Passengers started using southern and middle of line 3 of metro in 2014 and some parts of northern extension of this line in Sep. 2016. The remaining parts of line 3 planned to be completed and open to public till March