Man critical after he was crushed by pipes at Sydney worksite accident.

Man critical after he was crushed by pipes at Sydney worksite accident (Nine News)

A man is fighting for life after being crushed by two heavy steel beams at a worksite in Moorebank, 27km southwest of Sydney.

The 59-year-old man was struck in the head and suffered critical head injuries before being taken to the emergency department at Liverpool Hospital.

According to Nine News, the worker at the construction site was unloading the beams when they fell from the back of a truck.

It's the FOURTH major accident on a Sydney construction site in less than a week, with a 59-year-old man today crushed by steel pipes on a worksite in Moorebank. @Danielle_Post #9News pic.twitter.com/LTSPVAnK6f — Nine News Sydney (@9NewsSyd) September 16, 2019

It comes five days after a 30-year-old man died in an in an industrial accident in western Sydney despite desperate attempts from first responders to save his life.

It was the first of three workplace incidents in three hours across the city last Wednesday.

Emergency services were called to a timber pallet factory in St Marys shortly after 5.30am and found the man suffering serious injuries to his head.

“He was stuck in a piece of machinery,” a NSW Ambulance spokeswoman told news.com.au.

More to come.