Infrastructure & tunnelling
TBM tunnelling, metro and rail infrastructure for leading international contractors.
ASKAY has worked on some of Istanbul’s landmark transport projects, including the Marmaray Bosphorus rail crossing and the Eurasia road tunnel, for contractors from Japan, Korea, Spain, Russia and Türkiye.
Our scope covers the full tunnel delivery chain, working inside the main contractor’s programme on live urban sites.
Our scope
Tunnelling
- TBM erection, launch shaft assembly and back-up systems
- TBM tunnel construction, Ø6.2 to 13 m
- Slurry plant operation and tunnel logistics
Steel and equipment
- Tunnel mechanical and steel works
- Design and manufacture of TBM equipment
Metro and rail
- Tunnel segment factories on an EPC basis
- Stations, canopies, depots and maintenance buildings
- Rolling stock refurbishment, signalling and catenary
- Welded locomotive and freight wagon components
Related projects
Marmaray Bosphorus Crossing
TBM erection; 4 × 4,500 m, Ø8 m tunnel construction
Client: Taisei Corporation
Marmaray Tunnels No. 1 & 2
Mechanical and steel works
Client: Gama – Nurol JV
Marmaray CR3
Canopies for 13 stations, Gebze depot and maintenance buildings
Client: OHL – Dimetronic JV
Eurasia (Avrasya) Tunnel
Ø13 m TBM tunnel: slurry plant operation, mechanical and steel works, TBM equipment
Client: Yapı Merkezi – SK JV
Melen 7
1 × 3,300 m, Ø6.2 m TBM tunnelling
Client: Mosmetrostroy
Dudullu – Bostancı Metro
Segment factory (EPC), administrative building and Kayışdağı station
Client: Şenbay – Kolin – Kalyon JV
Rail systems
Rolling stock refurbishment, signalling, catenary, welded components
Client: TCDD, Tülomsaş