Foundation pit supporting structure and method

The invention discloses a foundation pit supporting structure and method, and relates to the technical field of municipal road foundation pits. The problem that a one-section support in an existing foundation pit is prone to shear fracture or water leakage at a joint is solved. The device comprises a plurality of inner supports and a plurality of first spherical hinge supports, the inner supports are horizontally arranged between underground diaphragm walls on the two sides at intervals, the two ends of each inner support are each connected with one first spherical hinge support, and the other end of each first spherical hinge support is fixedly connected to the corresponding underground diaphragm wall. The method comprises the steps that a jack of a foundation pit supporting structure is fixedly connected to the bottom end of the middle of a first horizontal support, one ends of two compression-resistant screws of an inner support are hinged to the bottom end of the jack, and the other ends of the two compre