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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).
We have completed the following:
The following are now under construction:
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.
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.
Last Updated: 9 May 2016
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