Tunnel foundation pit diversion construction structure penetrating through non-navigable river channel

The utility model discloses a tunnel foundation pit diversion construction structure passing through a non-navigable river channel, which comprises a conventional elevation fender post, a low elevation fender post and a diversion pipe, and the conventional elevation fender post and the low elevation fender post are arranged at the positions close to two sides of a tunnel in a backfill range; lower top beams are arranged on the tops of the low-elevation fender posts, and a full-length bottom plate is arranged between the lower top beams. An upper crown beam is arranged at the top of the conventional elevation fender post, a full-length main supporting beam is arranged between the two sides of the upper crown beam and the two sides of the lower crown beam, a water retaining wall is formed in a quadrilateral area defined by the upper crown beam, the lower crown beam and the main supporting beam through concrete pouring, and a U-shaped groove is defined by the bottom plate and the main supporting beam. And the fl