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Telok Blangah Road to Semi-Expressway


Market Sector

Bridge, Surface Transportation


Segmental, Roadway Design

Services Provided

Construction Engineering and Inspection, Design


Asia Pacific

The Upgrade of Telok Blangah Road to Semi-Expressway Phase 1 is a Design and Build (D&B) Highway Project for the construction of a 2400 meters long viaduct on top of the existing Telok Blangah Road; reconstruction of the at-grade road system; and drainage systems for both viaduct and at-grade and retaining structures. The main viaduct features a dual 3-lane carriageway that begins from Keppel Road, right before the junction of Kampong Bahru Road, and ends after the junction of Henderson Road with four other ramp structures that link the bridge to the at-grade below.

Project Highlights:

  • The main viaduct was constructed using the prestressed pre-cast segmental balanced cantilever method, while the ramps are all cast in-situ post-tensioned reinforced concrete (R.C.) structures. Each main viaduct carriageway is made of pre-cast box girder sections that are 12.8 meters wide and 2 meters deep, while the ramp box girders are narrower at 7.5 meters wide. Main viaduct crossheads are semi pre-cast post-tensioned R.C. elements supported on R.C. piers. Conventional pile-caps and bored piles formed the foundation for the entire bridge.
  • The bridge is designed as a continuous frame structure with bearings and expansion joints introduced only at every six to seven spans. The span lengths of the main bridge and ramps typically vary between 30 meters to a maximum of 45 meters, except for a portion of ramp near Gateway Avenue where the ramp span lengths were up to a maximum 80 meters.
  • The major constraints encountered onsite and managed successfully included: the presence of a bored MRT tunnel running at a depth of about 18-20 meters below at-grade level below the viaduct; a busy, congested and developed site; and the presence of many major types of service cables and pipes, such as sewer lines, water pipes and high voltage electrical cables.

Services Provided:

  • Civil & Structural (C&S) Engineering Consultancy Services for the D&B Contractor, Hock Lian Seng Infrastructure Pte Ltd
Construction Excellence Award, 2003
Construction Industry Development Board (CIDB)
Design Excellence Award, 2003
Association of Consulting Engineers Singapore (ACES)