Inland Revenue Authority of Singapore
This project was completed in 1995 and marks the pioneer of Intelligent Buildings in Singapore.
The structure consist of a 4 Storey Basement, a 24 Storey Tower and a 5 Storey Podium.
The Podium slabs were mainly Hollow Core Slabs supported by cast in-situ beams. A topping of 75mm with a mesh of A10 was placed on the Hollow Core Slabs to provide continuity to cater for diaphragm action of the slabs.
The 24 Storey Tower Block consisted of 2 Stair Cores and 2 Lift Cores constructed by the Jump Form System. The slabs from the 2nd Storey to the 24th Storey being identical and thus were constructed by the Table Forms System. Most of the beams supporting the Tower Blocks slabs were designed to be post-tensioning beams, the maximum length being 15m, supporting slab width of 3.5m. This creates a column free internal space that allows flexibility in internal office space arrangements.
The Basement was constructed using the Top-Down Construction Method to avoid major disruption of Traffic and possible soil disturbance causing movements of near-by structures including the Novena MRT Station and tunnels. For this method, Diaphragm Walls system was being used as the basement external walls and Sub-structure slabs were used as permanent lateral supports to control deflection of Diaphragm Walls during the downward excavations.
I have been awarded a book prize for the detailed report of the basement construction method and it is now kept in the Nanyang Technological University Library for reference purposes: The Title: Report on Industrial Attachment with Public Works Department, Call No. T2.GCL 1992, Located at NTU Library 2 (Level B2), Reserved Book Room. Click
Recorded by: Er. Goh Cheow Leng Maria Managing Partner
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