Improved Messer Shield construction method using a PC culvert according to an embodiment of the present invention, in a conventional Messer Shield construction method in which tunnel excavation is performed from the progress of a Messer plate arranged in a support material, to form an underground space in the tunnel 1 As a secondary lining process, a PC culvert for forming an underground space in the tunnel and a pre-operation step for the underground space in the tunnel, and a PC culvert installation step for installing the pre-prepared PC culvert in the underground space in the tunnel, installed And a step of injecting mortar into the joint between the first PC culvert and the neighboring second PC culvert, and an outer mortar filling operation step of filling the mortar between the first and second PC culverts and the underground space in the tunnel. It is characterized by.
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