Novel joint structure of large-diameter shield station foundation pit diaphragm wall and construction method

The invention relates to a novel joint structure of a large-diameter shield station foundation pit diaphragm wall and a construction method, the novel joint structure comprises a subway station diaphragm wall, a guide wall and a grouting structure, the guide wall surrounds the subway station diaphragm wall, the guide wall is formed by sequentially connecting a plurality of sections of standard knot guide walls, and female joints and male joints between the standard knot guide walls are in meshed connection; the underground diaphragm wall of the subway station comprises a plurality of sections of standard knot underground diaphragm walls, the two ends of each section of standard knot underground diaphragm wall are provided with an inner convex connector and an outer convex connector respectively, and the inner convex connectors and the outer convex connectors between the standard knots of the underground diaphragm wall are connected in an engaged mode. Comprising the steps of inner and outer guide wall constru