Subway station open excavation assembly workpiece and construction technology thereof

The invention relates to the technical field of metro stations, in particular to a metro station open excavation assembly workpiece and a construction technology thereof.The metro station open excavation assembly workpiece comprises an automatic fixing and grouting mechanism arranged at the joint of a side wall and a top plate and used for fixedly connecting the side wall and the top plate; the first supporting mechanism is arranged on the middle stand column and used for supporting the middle stand column; the second supporting mechanism is arranged on the middle longitudinal beam and used for limiting and supporting the middle plate; a limiting assembly, a slurry tank and a door plate mechanism are arranged in the top plate, when the top plate is assembled, a positioning rod is aligned with the limiting assembly, the positioning rod can push a movable rod to move backwards, and then the movable rod is inserted into a positioning groove in the positioning rod under the elastic force action of a limiting spri