MEXICO CITY — Development errors led to the Could collapse of an overpass in Mexico Metropolis’s subway system that killed 26 individuals and injured scores extra, in keeping with the preliminary outcomes of an unbiased investigation launched by town’s authorities on Wednesday.
The report, produced by the Norwegian danger administration firm DNV, means that poor welding of metallic studs, which weren’t correctly fused to a metal beam that held up the practice tracks, was amongst a number of errors that contributed to the collapse.
The outcomes help the findings of a New York Instances investigation that highlighted shoddy building on the metro line. A few of the studs holding the construction collectively appeared to have failed due to unhealthy welds, The Instances discovered, a vital mistake that most likely brought on the overpass to provide manner.
Engineers consulted by The Instances pointed to the presence of ceramic rings, or ferrules, left in place after the welding course of as proof of subpar workmanship, a discovering that was confirmed by the DNV investigation.
In a press release, DNV mentioned its report was based mostly on “the sector investigation and the laboratory testing of samples from the accident” and that it “solely accommodates DNV’s speculation at this level.” The total investigation can be completed later this yr, the corporate mentioned. Mexico Metropolis’s authorities, which employed DNV to look at the causes of the crash, can be conducting its personal investigation into the accident.
The outcomes of the unbiased inquiry might spell bother for 2 of Mexico’s strongest figures: Marcelo Ebrard, the international secretary, and Carlos Slim, one of many world’s richest businessmen.
Mr. Ebrard, the mayor of Mexico Metropolis when the road was constructed, needed it accomplished earlier than he left workplace in 2012, in keeping with a number of individuals who labored on the undertaking. He’s seen as a robust contender to succeed President Andrés Manuel López Obrador in Mexico’s subsequent presidential elections in 2024.
Mr. Slim’s conglomerate, Group Carso, constructed Line 12, the a part of the metro that collapsed. Line 12, Carso’s first rail undertaking, was supposed to develop the corporate into the profitable sector.
Carso is now constructing a big a part of Tren Maya, a 950-mile railway meant to bolster the financial system of southern Mexico — one of many nation’s poorest areas — and stand as Mr. López Obrador’s legacy undertaking.
Some engineers and designers engaged on the Tren Maya have complained of issues much like these confronted after they constructed the subway: a rushed, disorganized course of that has no grasp plan to information building. And Mr. López Obrador has insisted that he needs the Tren Maya to be completed earlier than he leaves workplace in 2024.