07.06.2016 : Andre Soh

Taking cantilever technology to new heights

Go behind the walls and watch how cantilever technology is creating the centrepiece of Singapore’s new mixed-use precinct.

Cantilever technology is being used to create a striking, integrated mixed-use development in Singapore’s new growth area. Two uniquely designed towers will provide 21 storeys of Grade A office space and a 350+ room five-star hotel, sitting on a retail podium in one, and 49 storeys housing 660 luxury residential apartments in the other.

Take a journey through the building and learn about cantilever technology from Andre Soh, Senior Associate Director, who has worked on the project from Day One.

In 2011, the building’s architect came to us with the scheme to have 21 metre cantilevers and 10 metre cantilevers for the residential block.

To make this happen we put three large mega trusses at strategic locations to hold the floors up at 21 metres, 19 metres and 17 metres, hanging nine floors below.

Andre says, “This is like putting a bridge on a building that has large eccentric loads wanting to pull the building forward. What makes it challenging is having a rather slim and very tall residential block, with approximately 10 metres of cantilever with 20 floors outside the main centroid wanting to tilt the building forward”.

In the video Andre describes how important it was to understand how the building would behave and how the contractor was going to put everything together. On Level 24 of the commercial block, he shows the top half of the mega trusses holding the cantilever floors up and describes how they are connected back to the core of the building, with six hanger columns that go all the way down to pick up ten floors below.

From level 7 of the building, Andre points to the incline columns showing the difference in the cantilever and explains how the building’s cantilevers incline columns and floor plates work to create a push and pull system to counteract the forces created by the building’s unique design.

In Basement 3 of the residential tower, Andre shows the 19 metre core walls that stabilise the whole building, with holes for post-tensioned strands that have 30,000 kN pulling down on them!

“It’s like a bow and arrow –the PT strands pull at the back of the cantilever core walls holding the walls in place, while the contractor loads and stacks up the top few floors that forms the cantilever floors.”

Watch the video for the full story of how this fascinating building is coming together.
About the Author

Andre Soh

Senior Associate Director - Civil & Structural

Andre is a Senior Associate Director with a passion for seismic engineering and building base isolation. He leads a large design team for project DUO - a complex and challenging mixed-use development in the heart of Singapore.

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