What challenges did crews face working under the live Keppel Viaduct?

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Crews Faced Significant Engineering Challenges Working Under the Live Keppel Viaduct

Crews undertaking construction for the new Circle Line stations encountered considerable engineering complexities, notably when working beneath the active Keppel Viaduct. The primary challenge involved navigating ongoing construction activities directly below the viaduct while implementing measures to safeguard its structural integrity and foundations, a task described as one of the Land Transport Authority's most demanding engineering feats.
Protecting Foundations of a Century-Old Structure

The construction necessitated working in close proximity to the Keppel Viaduct, a structure that predates the current project by decades. A critical aspect of the operation was ensuring that the foundations of this nearly century-old viaduct remained undisturbed and undamaged by the tunneling and construction activities occurring just metres below. This required meticulous planning and execution to avoid any compromise to the viaduct's stability.
Navigating Active Infrastructure

The term "live" in relation to the Keppel Viaduct signifies that it remained operational and in active use throughout the construction period. This meant that crews had to contend with the continuous movement and load of traffic on the viaduct above. Working under such conditions demanded sophisticated engineering solutions and stringent safety protocols to prevent any disruption to the existing transport network or damage to the infrastructure.
Tunneling in Close Proximity to Existing Structures

Beyond the Keppel Viaduct, the project also involved tunneling approximately seven metres beneath the Tanjong Pagar Railway Station, another historical landmark. This parallel challenge underscores the broader engineering difficulties faced, which included executing precise underground excavation without impacting the foundations or structural integrity of established and operational infrastructure, highlighting a pattern of complex, close-quarters construction.

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What challenges did crews face working under the live Keppel Viaduct?

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