Design and Top-down Construction of the 48-Storey Plaza Indonesia Extension

The Plaza Indonesia Extension is a large-scale, multipurpose high-end development project with the basement constructed from the ground floor down and the superstructure from the ground floor up. The project is located in a densely-built prime area. Excavation depth reached 17 m, just meters away from the existing podium block of the Grand Hyatt Hotel and the Japanese Embassy. Using top-down construction method, when the 5th basement level was completed, the superstructure had reached the 10th floor, saving 11 months' construction time. The columns and the RC core walls were temporarily supported by composite infill steel boxes, 600 x 600 mm, embedded into 70 m deep bored piles. The building, designed to withstand 2475-year earthquake, exceeded the Indonesian Code requirement of 475-year. A special study on the seismicity of Jakarta, as well as Site- Specific Response Analysis for the project location, were conducted to meet this criterion. This paper describes the complexity of the design and construction of the Plaza Indonesia Extension project, completed in 2009.