공중에서 조립되는 거대 교량? 소름 돋는 건설 엔지니어링 #worker #process #amazing #machinery #structure

Added: 2026-05-27

This video demonstrates the aerial installation technique for elevated highway bridges, where large prestressed concrete box girders are lifted by launching cranes and precisely positioned between piers without disrupting ground traffic, showcasing modern civil engineering methods that minimize construction impact on existing infrastructure.