Work has re-started on the site of port upgrades in central Queensland over the weekend, following the end of a four-day safety protest.

Workers at the Wiggins Island Coal Export Terminal construction site in Gladstone staged the 'sit-in' to draw attention to allegedly unsafe working conditions at the port, claiming they were forced to work on shoddy and sometimes broken platforms used for shifting heavy loads.

It seems he employees may have got their way, according to Construction, Forestry, Mining and Energy Union (CFMEU) spokesman Ben Loake, who says the project bosses have agreed to work on issues.

Mr Loake said: “There's protections under the Workplace Health and Safety Act about workers having the right to remove themselves from imminent risk. So it wasn't a strike - the blokes didn't go home, they continued to sit in the shed every day, as painful as it was spending 12 hours a day sitting in a shed...It did take several days to get to the point where we sat down with management going through all these issues to close them out.”

Reports say teams are now back to their normal tasks, with site management working on rectifying their concerns.