The Big Story
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NEW SENTOSA GATEWAY TUNNEL

The Sentosa Gateway Tunnel (SGT) is a one way tunnel for vehicles leaving Sentosa to Lower Delta Road or Keppel Road.

Concurrently with the tunnel construction, the LTA will be widening Lower Delta Road from two lanes to three lanes in both directions between Kampong Bahru Road and AYE. In addition, the LTA will upgrade the Lower Delta Flyover to allow motorists from Lower Delta Road (north bound) to connect directly to the AYE (city bound).

Construction Status

We have completed the following:

  • Stage 1 works for the project, which is the construction of diaphragm walls (or earth retaining walls) along Sentosa Gateway, Keppel Road, Kampong Bahru Road and Lower Delta Road
  • Stage 2 works, which is excavation and strutting for construction of tunnel structure along Lower Delta Road and Kampong Bahru Road is in progress
  • Underpinning of Sentosa Monorail columns
  • Tunnel structure along Sentosa Gateway and Keppel Road
  • Widening of Lower Delta Road from 2 lanes to 3 lanes, in both directions, between Telok Blangah Rise and AYE
  • Opened up the new right turn from Lower Delta Road to AYE(MCE)

The following are now under construction:
  • Construction of remaining tunnel structure along Lower Delta Road and Kampong Bahru Road is in progress
  • Underground excavation and construction of the piped box tunnel structure undercrossing Telok Blangah Road and Kampong Bahru Road is in progress
  • Road and drainage works along Kampong Bahru Road between Telok Blangah Road and Lower Delta Road
  • Mechanical and electrical services installation works within the completed tunnels

Key Project Challenge

The project is located within a heavily built-up area, with a very tight construction corridor where the existing North-East Line (NEL) tunnels are just about 1.6m below the road tunnel, while the foundations of the West Coast Highway viaduct is about 1m away from the tunnel.

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Besides ensuring that the NEL and viaduct are not affected by ground movement during construction, the team also has to contend with the busy traffic along Telok Blangah Road and Kampong Bahru Road and the many utilities beneath these roads. To prevent extensive road diversions and traffic disruptions, LTA deployed a piped-box tunnelling method to build the tunnel, instead of the conventional cut-and-cover method.

As this method is being deployed for the first time and coupled with difficult ground conditions (mix of both hard rocks and soft soil), the construction for the piped box tunnel (comprising a two-lane piped box tunnel under Telok Blangah Road and one-lane piped box tunnel under Kampong Bahru Road) was planned and carried out sequentially to ensure that excavation for the box tunnel is carried out safely and in a controlled manner.

The overall project is now expected to be completed by end 2016.

Artist Impression

Tunnel entrance at Sentosa Gateway

Tunnel exit along Kampong Bahru Road

Tunnel exit along Keppel Road

Sentosa Gateway Tunnel

Site Photos

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Works completed along Sentosa Gateway

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Underpinning works & construction of tunnel along Sentosa Gateway completed

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New right turn from Lower Delta Road to AYE(MCE)

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Widening of Lower Delta Road from 2 lanes to 3 lanes between AYE and Telok Blangah Rise

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Completed tunnel structure along Keppel Road

Last Updated: 11 January 2016

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