MEXICO CITY — Poorly placed studs, obvious design flaws and poor welding caused the capital’s subway system to collapse last spring, killing 26 people and injuring several, Mexico City’s attorney general said Thursday in a statement. Releasing the results of the month’s investigation, said.
Metal studs were vital to the entire construction, forming a composite unit between the steel beam and the concrete slab. Once the studs failed, the entire structure was largely weakened, which eventually led to collapse.
“The studs connecting the concrete slab to the metal beam were incorrect,” said Ulysses Lara López, a spokeswoman for the attorney general’s office. “In the sections where the concrete slab was separated from the beams, all studs were set poorly on an irregular pattern.”
Mr Lara said that such fundamental flaws could not have been detected through regular inspection or avoided through regular maintenance.
Releasing the findings of his office on Thursday, Attorney General Ernestina Godoy Ramos described the report as “a deep, serious, scientific investigation conducted by experts.”
an independent report Serious manufacturing errors, including the placement and welding of metal studs, were also found earlier this year by Norwegian risk management company DNV. The government of Mexico City hired the DNV to investigate the cause of the accident.
The subway crash has caused political shock waves that have struck some of Mexico’s most powerful people, including Foreign Minister Marcelo Ebrard, who was Mexico City’s mayor at the time the line was built.
Mr Ebrard, as well as the current mayor, Claudia Sheinbaum, are both expected to seek the presidency in the 2024 election.
The collapsed metro section was built by the Carso Group, a massive conglomerate owned by one of Mexico’s richest and most powerful men, Carlos Slim. a close associate President Andrés Manuel López Obrador K. (Mr. Slim was also once a large shareholder of The New York Times Company.)
Ms Godoy said her office would initiate criminal proceedings against those responsible for the collapse, although she did not identify anyone. “Just as our mandate is justice, our priority has been and will continue to be hunting,” she said.