Externally encased prefabricated UHPC slab arch bridge with concrete-filled steel tube stiff skeleton

An externally encased prefabricated ultra-high-performance concrete (UHPC) slab arch bridge with a concrete-filled steel tube stiff skeleton, comprising:

• a concrete-filled steel tube stiff skeleton arch rib segment, wherein the concrete-filled steel tube stiff skeleton arch rib segment is arranged at four corners inside a concrete-filled steel tube stiff skeleton externally encased prefabricated UHPC slab arch rib segment, and the concrete-filled steel tube stiff skeleton externally encased prefabricated UHPC slab arch rib segment comprises two web structures, wherein a top and a bottom of the two web structures are respectively connected to a roof structure and a floor structure through a cast-in-situ UHPC longitudinal joint and a cast-in-situ UHPC transverse joint;
• wherein the concrete-filled steel tube stiff skeleton arch rib segment comprises a hollow steel tube truss arch rib segment, core concrete is poured inside the hollow steel tube truss arch rib segment, and the hollow steel tube truss arch rib segment is fixedly connected to the cast-in-situ UHPC longitudinal joint through a plurality of headed studs;
• wherein each of the two web structures comprises a prefabricated UHPC web, and a prefabricated UHPC web steel mesh arranged uniformly and equidistantly is distributed on the prefabricated UHPC web;
• wherein the roof structure comprises a prefabricated UHPC roof, and a prefabricated UHPC roof steel mesh arranged uniformly and equidistantly is distributed on the prefabricated UHPC roof;
• and
• wherein the floor structure comprises a prefabricated UHPC floor, and a prefabricated UHPC floor steel mesh arranged uniformly and equidistantly is distributed on the prefabricated UHPC floor.