A design flaw and inadequate concrete curing in a cantilevered segment of an elevated rail track being built in Delhi, India, caused the July 12 collapse that killed six people, according to a government report released on July 28. The rail agency Delhi Metro Rail Corp. (DMRC) may ban from further work the design-build contractor that holds several other contracts on the system. DMRC also is inspecting 87 piers previously constructed for the project.
A 4.2-meter-long cantilevered segment collapsed when crews with Gammon India, Mumbai, used a launching girder to place another segment for a 20-kilometer-long new rail line under construction from Delhi to the southeast. Delhi Metro Rail Corp.’s investigative panel was charged with producing a report in 10 days.