An assembly set composed of formwork shuttering (yellow structure in picture) plus handrail/deck was pulled by an overhead crane.The set of assembly had to be installed around the steel reinforcement for the concrete pouring.Suddenly, the handrails/deck dislocated from the formwork shuttering and hit the operator who was working on a metallic deck.Dislocation is caused because the 2 bars fixing the handrail/deck in horizontal position are detached (fastened) from the shutteringformwork.SPIE worker fell on the deck after being hit by the handrails/deck (did not lost consciousness).SPIE worker stood up and went down by himself from the deck and received first aid from firefighters. He was immediatelytransported to the nearest hospitalAll PPE worn, the violent choc with the handrails/decks was attenuated (especially the helmet).