Existing railway tunnel open cut tunnel prefabricated arch ring mechanical assembly construction method

The invention discloses an existing railway tunnel open cut tunnel prefabricated arch ring mechanical assembly construction method, and relates to the technical field of railway tunnel open cut tunnel construction. The crane is fixed in a customized mode through existing railway transportation and installed in place; hoisting is carried out based on a customized fixed crane, and a prefabricated arch ring is fully arranged on a section of side wall in a sliding mode; an arch ring storage support is installed on the prefabricated arch ring on one side wall, and the remaining prefabricated arch rings needing to be installed are stored; the customized fixed crane is dismantled, and a two-section side wall is poured; an arch ring translation platform mechanism is installed on the second-section side wall, the prefabricated arch ring on the arch ring storage support slides to the arch ring translation platform mechanism in a sliding mode, and the prefabricated arch ring is lowered to the second-section side wall to