Closed steam-cured system of segment box girder

The utility model discloses a closed steam-cured system of a segment box girder. The system comprises a closed steam-cured shed and a plurality of steam-cured pipelines, wherein the closed steam-cured shed covers the outside of a segment box girder to be cured, the plurality of steam-cured pipelines are laid inside the closed steam-cured shed, the steam-cured pipelines and the segment box girder to be cured are horizontally laid, the plurality of steam-cured pipelines comprise a plurality of bottom pipelines, a plurality of left side pipelines, a plurality of right side pipelines and a plurality of box-in pipelines, the plurality of bottom pipelines are sequentially laid under the bottom of the segment box girder to be cured from left to right, the plurality of left side pipelines and the plurality of right side pipelines are respectively sequentially laid on the left side of the segment box girder to be cured and the right side of the segment box girder to be cured from top to bottom, and the plurality of bo