Method for assembling steel containment, annular hanging beam and annular rail of nuclear power station

The invention relates to the technical field of nuclear power station ring hanging beam assembly, in particular to an assembly method of a nuclear power station steel containment, a ring hanging beam and a ring rail. The invention provides a method for assembling a steel containment, a ring hanging beam and a ring rail of a nuclear power station, which comprises the following steps of: prefabricating a plurality of ring hanging beam single sections which can be spliced into an annular ring hanging beam in sequence, and transporting all the ring hanging beam single sections to an assembling area of the nuclear power station; a datum point is arranged in a nuclear power station splicing area, a plurality of arc-shaped steel plates are welded around a preset center with the datum point as the preset center to form a barrel of the containment, and splicing areas in one-to-one correspondence with the annular hanging beam single sections are preset on the inner side wall of the barrel; all the ring hanging beam sin