A 720-tonne gantry crane tipped off its rails on Friday, dropping a section of the new Port Mann bridge into the Fraser River, just east of Vancouver. (Steve Lus/CBC)

Work has resumed on the Port Mann Bridge east of Vancouver following the collapse of a gantry crane on Friday, but there is no word yet when the broken equipment will be fixed.

The bridge designer and the engineer who designed how it would be built are both at the site, along with the manufacturer of the gantry crane, which crushed one of its supports on Friday and dropped a 90-tonne piece of concrete into the Fraser River.

The segment struck a piling as it fell and is now submerged in the river. It is unclear whether the segment can be recovered.

The bridge segments are brought in by barge and lifted into place by the special 720-tonne horizontal gantry crane, which is also called a segment launcher.

Project spokesman Max Logan says they will try to design a speedy repair, but it is too soon to say how long it might take to fix the crane.

Logan says contractor Kiewit is responsible for any costs or delays.

"Once the investigation and the repair plans are more advanced, the contractor and transportation investment corporation will be in a position to determine if there will be any impact to the project schedule," said Logan.

Work continues on other areas of the bridge and WorkSafeBC is on site. No one was hurt in Friday's incident.

When completed, the $800-million bridge will provide 10-lane crossing of the Fraser River for the Trans-Canada Highway east of Vancouver. It is scheduled to be completed in 2013.

The cost of the entire Highway 1 upgrade — extending several kilometres on either side of the new bridge — is estimated to be $3.3 billion.