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Downtown Line 3 (Package B)

Singapore

Market Sector

Rail and Transit

Type

Passenger and Transit

Services Provided

Architecture, Construction Engineering and Inspection, Design, Planning, Program Management

Region

Asia Pacific

The proposed Downtown Line Stage 3 (DTL3) will be an underground Mass Rapid Transit (MRT) System extending from Downtown Line Stage 1 (DTL1) Chinatown Station through MacPherson, Bedok Reservoir, and Tampines, and ending at the East-West Line Expo Station. It consists of 16 stations and a total route length of about 23 kilometers, including connection to Kim Chuan Depot. The Project is divided into three packages: A, B and C.

The contract for DTL3 Package B was awarded to T.Y. Lin International Pte Ltd/Ong & Ong Pte Ltd JV, with T.Y. Lin International Pte Ltd named as the Lead Consultant. DTL3 Package includes five underground MRT stations with 9 kilometers of tunnel boring machine (TBM) tunnels.

Project Highlights (DTL-3 Package B):

  • Packaged into six contracts for construction
  • Involves covering stations; cut & cover tunnels; TBM & NATM tunnels; escape shafts; cross passages
  • Rolling stock comprised of 3-car train (70 meters)
  • Features of underground stations:
    • 25 - 30 meters deep, 130 - 150 meters long, 24 - 34 meters wide
    • Four standard stations and one civil defense station
    • Four island platforms and one side platform
    • Construction of station, cut & cover tunnels or escape shafts by braced excavation
  • Bored tunnels: 13 kilometers in length (9 kilometer mainline, 4 kilometer reception track)
  • Bored tunnels: 6.35 meter diameter by EPB TBMs
  • Cross passages: by mining (NATM)

Services Provided:

  • Lead Consultant - Spearhead, plan and manage the Architectural and Engineering (A&E) Consultancy Services to produce a complete design for DTL3 Package B
  • Civil & Structural (C&S) Engineering Consultancy Services
  • Mechanical & Electrical (M&E) Engineering Consultancy Services (building services, utilities diversions, CSD/SEM drawings)