Auxiliary device for backfilling concrete into through pipe

The utility model relates to an auxiliary device for backfilling concrete into a through pipe, and belongs to the technical field of through pipe construction. The anti-floating device comprises a plurality of vertically-downward anti-floating assemblies which are fixedly connected to the top of the inner wall of the concrete pipe at intervals in the length direction. A certain gap is reserved between the bottom of the anti-floating assembly and the top of the outer wall of the penetrating steel pipe, and an exhaust pipe and a grouting pipe which are arranged in the length direction of the concrete pipe are arranged on the two sides of the top of the anti-floating assembly correspondingly; a plurality of exhaust holes are formed in the exhaust pipe in the length direction at intervals; a plurality of grout supplementing holes are formed in the grouting pipe in the length direction at intervals. The through steel pipe is prevented from floating greatly in the concrete backfilling process, and the interlayer ca