Technical specifications

Scope of work

  • 2 tunnel tubes
    length: 2,550 m each, internal diameter: 5.80 m
  • 6 cross-passages at intervals of 250 m
  • 2 stations:
    Serangoon Station, 205 m long
    Woodleigh Station, 210 m long,
    built in an open excavation supported by shoring (soldier piles and timber lagging)
    designed as civil defence shelters, turn-key
  • 1 viaduct with 2 separate superstructures with 2 x 3 lanes
    length: 1,750 m, width: 2 x 11.40 m
    using overhead launching system and the free cantilever method for large-span areas
  • Contiguous bored pile walls for Braddell Bartley Underpass
    approx. 1 km long, and soldier piles and timber lagging for the excavation of the Upper Paya Lebar Underpass box structure
  • extensive roadworks
  • 3 pedestrian bridges
  • 1 switching substation

Construction method

  • TBM tunnelling using 2 EPB shields
  • Shield diameter: 6.56 m
  • Cross-passages built using NATM techniques with an in-situ concrete inner lining

Geology

  • Sand
  • Clay
  • Granite

General data

Project
Singapore Metro, North East Line, Contract C704,
single-track metro tunnel

Client
Land Transport Authority of Singapore (LTA)

Contractor
Wayss & Freytag AG
as technical and commercial leader of a joint venture

Construction period
1997 to 2002

Construction costs
€ 177 million

Utilisation
Infrastructure
Type
Metro tunnel, single-track
Length
2 * 2,550 m
Construction Method
TBM tunneling using a EPB shield
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