Novel composite duct piece for shield section and profile steel framework

The invention provides a novel composite segment and section steel skeleton for a shield interval, the novel composite segment comprises a section steel skeleton, cambered surface reinforcing ribs and constructional steel bars, the section steel skeleton comprises at least three main section steel skeletons and end section steel skeletons, the main section steel skeletons are arc-shaped skeletons, and the main section steel skeletons are parallel to one another; the two end section steel frameworks are respectively welded and fixed at the two ends of each main section steel framework; the number of the cambered surface reinforcing ribs is multiple, the cambered surface reinforcing ribs are welded and fixed between at least two adjacent main section steel frameworks, and the cambered surface reinforcing ribs are welded and fixed between two end section steel frameworks. The constructional steel bars are used for forming the bolt connecting holes and/or the grouting holes, and the constructional steel bars and