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Every step has to occur in the correct sequence.
A mistake in sequencing can potentially create forces that were not anticipated.
That is why construction plans include detailed procedures for each stage of a project.
What Could Cause a Structural Failure?
There is rarely a single simple explanation for a serious structural accident.
Possible contributing factors can include design problems, construction errors, material failures, inadequate temporary supports, unexpected loads, equipment problems, environmental conditions, or a combination of several factors.
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But it is extremely important not to assign a cause based solely on an image.
A photograph showing broken concrete cannot tell investigators whether the problem resulted from a design issue, a construction mistake, equipment failure, or another circumstance.
Determining the actual cause requires a professional investigation.
Engineers may examine the remaining structure, construction documents, materials, photographs, equipment records, inspection reports, and witness accounts.
They may also study exactly how the structure failed.
The Human Cost Comes First
Whenever a structural collapse occurs at an active construction site, the first concern is not the bridge itself.
It is the people.
Construction workers often perform their jobs around enormous quantities of concrete and steel. They may work at significant heights and around cranes, trucks, lifting equipment, and partially completed structures.
An unexpected collapse can therefore become a life-threatening emergency almost instantly.
Emergency crews may have to search through debris while dealing with unstable remaining sections.
Rescuers must determine whether additional portions of the structure could fall.
Medical teams may establish treatment areas nearby.