Supporting structure for railway crossing under loess tunnel with extra-large section

The utility model relates to a supporting structure for a railway crossing under a loess tunnel with an extra-large section. Along with the enlarged excavated section of the loess tunnel, shallower burying depth and poorer stratum, the difficulty and the risk of construction become greater gradually. The characteristics of the supporting structure are as follows: the supporting structure comprises advance supports for a pipe shed and a small pipeline, a primary support, a secondary support and a secondary lining which are arranged under an arch part of the tunnel in sequence; and a waterproof layer is arranged between the secondary support and the secondary lining. In the utility model, the construction safety of a railway section crossing under a new loess tunnel with an extra-large section is effectively ensured, wherein the railway section is buried at an extremely shallow position with a small angle, and simultaneously, the construction procedure is simple, the excavated work surface is large, the operation of a large-size machine is convenient, and the construction progress of the tunnel is rapid.