Structure for backfilling and rebuilding construction adit into overhauling adit

The utility model discloses a structure for backfilling and rebuilding a construction adit into an overhauling adit. The structure comprises a main water conveyance tunnel and the construction adit crosswise communicated with the main water conveyance tunnel, wherein a concrete blocking section is arranged at a joint of the construction adit and the main water conveyance tunnel, and is provided with a first overhauling passage; a rubble concrete backfill layer section is laid at the bottom of the construction adit close to the concrete blocking section to form a second overhauling passage; the rubble concrete backfill layer section forms a curved structure shaped like a Chinese character Tu along the longitudinal direction of the construction adit; the highest part of the adit bottom at the curved structure shaped like the Chinese character Tu is a circular arc section, and a longitudinal slope, positioned on one side of the concrete blocking section, of the circular arc section is connected with that of a first overhauling passage; the elevation of the highest point of the tunnel bottom at the circular arc section is higher than a normal running water line of the main water conveyance tunnel; normal concrete with a thickness of 0.2m is laid on the surface of the tunnel bottom of the second overhauling passage to form an anti-seepage concrete road surface. According to the structure, the construction difficulty and the project investment are reduced, and the construction period is shortened.