... installed,raise working efficiency. 4. Application: (1)using for a high work platform,such as building,hall,bridge,viaduct,tunnel ... storage and work shed. (5)using for provisional bleacher and stand. (6)using for lager-scale quipment pipe(tank)installation and ... ,special variety of athletic frames,large scoreboard,large TV screen frame,light shelves,etc. (8)using for shipbuilding industry,military, ...