Assembled hollow pier and construction method thereof

The invention relates to bridge engineering, in particular to an assembled hollow pier and a construction method thereof. The assembled hollow pier comprises a bearing platform arranged at the lower end of the hollow pier; a hollow pier body; the cover beam is arranged at the upper end of the hollow pier body; the hollow pier body is mainly formed by splicing hollow pier units. The hollow pier further comprises prestressed reinforcements; the upper ends of the prestressed reinforcements are fixedly connected with the bent cap, and the lower ends are fixedly connected below or on the bearing platform. The hollow pier unit includes: an insertion portion provided at one end of the unit body; and the access part is arranged at one end of the collar of the unit body. Shear keys protruding out of the hollow pier units are distributed on the insertion parts. Shear grooves corresponding to the shear keys are distributed in the access part. According to the assembled hollow pier, the prestressed steel bars and the she