Initial reports suggest two workers were killed in the collapse.
The twisted steel wreckage at Vikas Marg in Lakshmi Nagar area of east Delhi is to be examined by a team of three in a technical committee set up by client for the project, the Dehli Metro Rail corporation.
The gantry was in use lifting segments for the 11th precast segmental span on a new line being built to connect the city to sports grounds being prepared for the 2010 Commonwealth Games.
British consultant Mott MacDonald is the permanent works designer for the project’s design-build contractor Afcons. A source close to the project said that it was thought a jack might have failed but emphasised that erection equipment design and use was not within its remit.