Because designing for minimum impact on existing hospitals is always a project engineer's goal, at Box Hill Hospital, a bridge was created forming an external plant platform allowing the Australian facility to remain fully operational during engineering upgrades, according to an article on the Sourceable website. 

A construction sequence drawing was developed which showed how the lightweight roof was to be protected with plywood during construction. 

Small things like positioning a lightweight aluminum scaffold two meters from the edge demonstrated how this would facilitate installation of the platform from the outside, with no access through the wards required.

The beauty of this solution was less about the final outcome but that it allowed all the construction activity to take place while babies were being born and the operating rooms were only down for one weekend rather than the four weeks, , the article said.

Read the article.