ing-lock scaffolding, one of the support system for construction, owns advantages both cup-lock scaffolding and shoring tower. It is the development direction of new type scaffolding. According to the standard diameter, they are divided into two series:Ф48 series andФ60 series. Equipped with staircases, the  Ф60 series can also be used as stair towers. The screw jack head and screw jack foot are adjustable. The system has excellent stability and bearing capacity, easy and flexible to assemble and disassemble, and has a high degree of standardization. It is widely used in buildings, bridges, tunnels etc...