Construction method of prefabricated UHPC (Ultra High Performance Concrete) formwork core-filled concrete pier

A prefabricated UHPC formwork core-filled concrete pier is built on a bearing platform, a concrete pouring cavity is formed in a formwork, and a steel reinforcement framework is arranged in the pouring cavity. The UHPC formwork is formed by connecting a plurality of prefabricated UHPC formwork sections, fibers extend out of the upper end face of the formwork section below the joint and the lower end face of the formwork section above the joint, and the upper end face and the lower end face of the formwork section are connected into a whole through ultra-high performance concrete grout. During construction, firstly, a UHPC formwork section with fibers extending out from the end face is prefabricated, reinforcing steel bars pre-embedded in a bearing platform are lengthened to form a first-section reinforcing steel bar framework of the bridge pier, the reinforcing steel bar framework is sleeved with one formwork section, core filling concrete is poured, then the reinforcing steel bars are lengthened to form a ne