The personnel who need to be equipped with a shift for the shield are: shield driver (also operating the oil cylinder) 65,438+0, segment assembler 65,438+0, bolt driver 2, single beam 65,438+0 (also see excavation and setting out), double beam 65,438+0, followed by water pipe and track plate 65,438+.

According to whether the excavation surface is closed or not, shield machines can be divided into closed and open types.

According to the principle of balance between earth pressure and water pressure on excavation face, closed shield machines can be divided into earth pressure type (commonly used earth pressure type) and muddy water type.