One Raffles Quay

Located in the prime business district, One Raffles Quay is the latest iconic landmark which serves as the gateway to the new downtown area of Singapore.  The project comprises twin office towers with two basements, a multi-level podium, an underground link to the Raffles Place mass rapid transit station and Singapore’s first commercially applied District Cooling System.

The North Tower and the South Tower add to an estimated 1.3 million square feet of prime, Grade A office space, and are purpose-built for banking and financial corporations.

The 29-storey (153-metre tall) South Tower has 18 office floors with a typical floor area of 30,000 square feet, while the 50-storey (245-metre tall) North Tower has 42 office floors with a typical floor area of 18,000 square feet. 

Client

   One Raffles Asset Management

Architects    KPF and Architects 61
Contractor

   Obayashi Construction

Key Challenges

  1. Presence of existing twin mass rapid transit (MRT) tunnels running below the northern part of the site and directly below the 50-storey North Tower
  2. Highly variable and difficult ground conditions created difficulties for the design of the foundation and substructure works
  3. Design of conventional transfer structures to carry loads from the 50-storey tower would have been too deep and obstruct the ground level lobby

 

Meinhardt’s Engineering Innovations

A unique structural system was devised, which allowed the 50-storey tower to be constructed over existing MRT tunnels

  1. The North Tower was skewed to achieve the shortest structural transfer span and balanced load distribution across the MRT tunnels.
  2. The transfer of interior tower loads was achieved through the central box core acting as a transfer structure, probably a world’s first for a building of such height and complexity.
  3. At the perimeter of the tower, loads were transferred through visible and iconic mega steel trusses and raking columns blending seamlessly with the architectural intent of a grand entrance lobby.
  4. For the safety and protection of the MRT tunnels during construction, shielding walls were constructed adjacent to the tunnels – a first in Singapore.
  5. A comprehensive instrumentation regime was implemented for close monitoring of ground, MRT tunnels, retaining walls and tower movements to ensure full safety during construction.  During excavation, real-time observational monitoring was carried out - which is another first in Singapore.  The results showed actual movement was 14.2 millimetres compared to the predicted movement of 14.8 millimetres.


  

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