Singapore's final DTL project breaks ground

摘要

Construction has begun on Downtown Line Three (DTL3) in Singapore. The Land Transport Authority (LTA) held the groundbreaking ceremony at Expo Station last month. An LTA spokesman identified Expo Station as a key project challenge. "It is positioned almost perpendicular to the existing overground East West Line (EWL) Expo Station. This poses significant constraints on the design and construction of the DTL3 station, as the foundation piles of two viaduct columns currently obstruct the construction of the station. "The two columns will therefore need to be modified, and will first be underpinned with a transfer structure before being integrated with the EWL Expo station's roof slab. As station construction will be carried out beside the operational EWL Expo station, a top down construction method was chosen, with diaphragm walls as a retaining system to minimise ground and structural movement."