Hundreds of construction union workers who went on strike at the Sunshine Coast University Hospital site have been ordered back on the job and banned from taking industrial action for three months. About 600 tradies downed tools on Thursday, but only 160 had approval to take the strike as part of a dispute between subcontractor Nilsen and the Electrical Trades Union. Lendlease, the contractor in charge of the hospital project, yesterday took the CFMEU to the Fair Work Commission, successfully securing an order demanding workers not involved in the dispute get back to work.