Sofia Metro Extension Project, Bulgaria

Client

Municipality of Sofia, Bulgaria

Main Contractor

Taisei Corporation, branch Bulgaria

Construction period

September 2008 – December 2009

Objects description:

  • tunnel boxes
  • rotation shaft connecting with tunnel boxes
  • reinstatement of subway

Construction technology:
Mechanical excavation, open cut excavation.

Executed works:

  • underpinning of metro foundation
  • tunnel boxes concreting
  • cut and cover tunnel – west tunnel tube – 42,71 m, east tunnel tube – 45,50 m
  • driven tunnel – west tunnel tube – 37,75 m, east tunnel tube – 34,98 m