Method for excavating combined vertical erection branch part of super-large rocky section tunnel steel frame rock wall

The invention provides a method for excavating a combined vertical erection branch part of a super-large rocky section tunnel steel frame rock wall. The method includes the specific steps that an excavation section of a tunnel is set, wherein an upper left pilot tunnel is a first excavation part, an upper right pilot tunnel is a second excavation part, the upper left pilot tunnel and the upper right pilot tunnel constitute an upper excavation section, a lower left pilot tunnel is a third excavation part, a lower right pilot tunnel is a fourth excavation part, a rock wall body is a fifth excavation part, the lower left pilot tunnel, the lower right pilot tunnel and the rock wall constitute a lower excavation part, and besides, a first supporting and protecting part, a second supporting andprotecting part, a third supporting and protecting part, a fourth supporting and protecting part and a fifth supporting and protecting part are included; the various excavation parts are excavated inturn, and primary support