Large-collapse longitudinal and transverse arch support construction method

The invention belongs to the technical field of tunnel arch support construction, and particularly relates to a large-collapse longitudinal and transverse arch support construction method. The construction method comprises the steps that a plurality of arch frame sections are prefabricated in a factory, undercut treatment is conducted according to the actual longitudinal section measurement condition of a tunnel, the arch frame sections are installed on an installation trolley and transferred to the installation position in the tunnel, the arch frame sections are installed in the tunnel, and gaps between the arch frame sections and the rock surface of the side wall of the tunnel section are densely filled with sprayed concrete; the method has the advantages and positive effects that (1) the time for constructors to stay in the tunnel in the longitudinal and transverse arch support construction process is greatly shortened, the arch sections always provide effective protection for the constructors during const