What caused the viaduct structure to collapse, killing one worker?

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The Collapse of the Upper Changi Road East Viaduct Structure

Preliminary investigations suggest that the collapse of the viaduct structure under construction at Upper Changi Road East, which resulted in the death of one worker and injuries to ten others, was caused by the failure of the corbels supporting the pre-cast beams. The incident occurred at approximately 3:30 am, impacting a section of the viaduct between two piers.
Structural Failure of Corbels

The corbels, which are structural elements designed to support heavy loads, are believed to have given way, leading to the partial collapse of the highway structure. The contractor, Or Kim Peow Contractors, was reportedly carrying out works to cast the decking for the new viaduct when the incident took place. A hospital spokesperson confirmed that eight of the injured workers were admitted for treatment, while two were discharged.
Ongoing Investigations and Safety Measures

The Building and Construction Authority (BCA) has revoked the permit for construction works at the site and is conducting investigations with the Ministry of Manpower (MOM) to determine the exact cause of the collapse. As a precautionary measure, the Land Transport Authority (LTA) has ordered a "safety timeout" for all road and rail construction sites, involving a review of safety measures and processes. The adjacent girders of the collapsed section are being propped and supported as a safety precaution.
Contractor's Safety Record

Or Kim Peow Contractors has a recent history of safety violations. Earlier the same week, the company and one of its staff members were convicted and fined for a fatal accident in 2015 at a different site, where one worker was killed and three others injured. The Ministry of Manpower described the company as "a company that does not take workplace safety seriously" in relation to that conviction.

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What caused the viaduct structure to collapse, killing one worker?

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