In March of this year the image shows the state of a pedestrian bridge over the Florida International University campus. The bridge collapsed the next day.
(Bolton, Perez & Associates Consulting Engineers via the NTSB)
Federal inspectors on Thursday released images showing cracks in the concrete of a pedestrian walkway — greater than what had been seen — on the campus of Miami, Florida International University, days before it collapsed and killed six people.
The photos were released by the National Transportation Safety Board (NTSB) as part of another preliminary report in the investigation of the March 15 collapse.
The agency previously released photos taken on Feb. 24, the documenting of small cracks at the ends of the bridge. The new photos with a larger cracks were taken after 10 March, when the prefabricated bridge was transported from a casting yard and place on permanent piers.
The researchers interviewed the employees of the eight companies involved in the bridge design and construction, the report said. Experts have also tested concrete, steel rods and a hydraulic jack. The report does not use test results or conclusions about what the cause of the collapse.
The bridge had to span a busy highway and canal and connect FIU campus to the neighboring community of Sweetwater. Five people in cars, and bridge worker were killed in the collapse; eight other people injured.
The bridge had been noted by FOREIGN officials as a performance for an accelerated construction method that was believed to be the risks for the workers and pedestrians and minimise traffic disruption.
When the bridge fell, the construction was behind schedule and millions over budget, partly as a result of a significant change in the design and the placement of one of the span supports, public documents showed.
The Associated Press contributed to this report.