Client

Land Transport Authority

Project Completion

Dec 2016

ER296 – Construction and Completion of Sentosa Gateway Tunnel and Associated Road Widening Works along Lower Delta Road

Sentosa Gateway Tunnel was a highly complex project due to its close proximity to the tunnels of North-East MRT Line and foundations of West Coast Highway viaduct. Other challenges faced by the project include large scale diversion of underground services by phases, construction of tunnel under heavy live traffic and a low tunnel height limit of 3.8 m.

The project team overcame these site constraints by working on highly efficient construction planning, strategic work sequences and innovated machineries and vehicles. To minimize disruption to the live traffic, construction methods of top-down, bottom-up and pipe-box tunnel (PBT) were adopted. During the process of tunnel construction, diaphragm wall (D-wall), steel strutting and RC walers systems were deployed to retain and stabilize the adjacent earth.

The entire project encompassed works such as the construction of pipe-box tunnel, cut-and-cover tunnel and contiguous bored pile (CBP) walls, diversion of sewer lines, road widening and the erection of a 3-storey facility building.

Special Feature

Adoption of semi-top-down RC walers system has significantly reduced the construction duration of this project.

11C-Photo-Gallery LTA ER296 - Construction & Completion of Sentosa Gateway Tunnel

Tunnel construction using bottom-up method

11D-Photo-Gallery LTA ER296 - Construction & Completion of Sentosa Gateway Tunnel

Construction of diaphragm wall

11E-Photo-Gallery LTA ER296 - Construction & Completion of Sentosa Gateway Tunnel

Construction of contiguous bored piles wall

11F-Photo-Gallery LTA ER296 - Construction & Completion of Sentosa Gateway Tunnel

Construction of pipe-box tunnel

11G-Photo-Gallery LTA ER296 - Construction & Completion of Sentosa Gateway Tunnel

Strutting of launching shafts with RC walers

11H-Photo-Gallery LTA ER296 - Construction & Completion of Sentosa Gateway Tunnel

Tunnel construction using cut-and-cover method

11I-Photo-Gallery LTA ER296 - Construction & Completion of Sentosa Gateway Tunnel

Pipe jacking at 1-lane and 2-lane pipe-box tunnel

11J-Photo-Gallery LTA ER296 - Construction & Completion of Sentosa Gateway Tunnel

Laying of flexible pavement inside the tunnel with modified machineries and vehicles

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