Backfilling structure applied to shield tunneling construction method

The utility model relates to a backfill structure applied to a shield tunneling construction method. The backfill structure comprises a partition wall, two formworks and a support. And a partition wall and a formwork are arranged in the receiving well, a filling space is formed among the partition wall, the formwork and the side wall where the tunnel portal is located, the filling space is backfilled with filling materials to form a supporting structure, and the supporting structure is used for blocking the tunnel portal. Meanwhile, the support is used for supporting the formwork, the stability of the formwork structure is guaranteed, and then the stability of the formed supporting structure is guaranteed. When the shield tunneling machine breaks the tunnel portal, due to the fact that the tunnel portal is blocked through the supporting structure at the moment, water, sand and the like are prevented from rushing into the receiving well through the circular seam between the shield tunneling machine and the rec