A second man has been taken to the Northern Hospital for observation, Ambulance Victoria said.
Worksafe has been notified and is on the scene and police will prepare a report for the coroner.
In a separate incident last month, a 56-year-old production manager died after 3.6 tonnes of panels fell onto the shipping container he was in.
He was unloading a stack of panels at a Carrum Downs truck body manufacturing business on the morning of January 21 when panels crushed him against the container wall, WorkSafe Victoria said at the time.
There were 24 workplace deaths in the state in 2019, WorkSafe said this month.
Under new workplace manslaughter laws that will come into effect in July, negligent bosses could face up to 20 years in jail and $16 million in fines for deaths caused by unsafe workplaces.
WorkSafe chief executive Colin Radford said most workplace deaths were preventable, and were caused by a failure to properly address safety risks.
“So employers are on notice to take their health and safety obligations seriously or risk jail if your negligence causes a worker’s death,” Mr Radford said.
“All employers must take time to properly assess workplace health and safety risks and plan how to eliminate or manage them, because failing to do so can be fatal.”