ERECTION METHOD OF MULTI-SPAN CONTINUOUS PREFLEX COMPOSITE BRIDGE OR RE-PRESTRESSED PREFLEX COMPOSITE BRIDGE

摘要

PURPOSE: An erection method of a multi-span continuous preflex composite bridge of a re-prestressed preflex composite bridge is provided to exactly transmit reaction of upper live load to the center of a pier and improve the appearance of the lower part of the bridge. CONSTITUTION: A preflex composite beam(1) or a re-prestressed preflex composite beam formed by composition of a steel I-shaped girder(2) and reinforced concrete(3) or steel strand for prestressed concrete is each manufactured on the ground. Each beam is independently erected on each span of the multi-span bridge as a simple beam structure and mechanism subsystem. The steel I-shaped girder of each span beam is combined completely continuously to change the simple beam structure and mechanism subsystem into a continuous structure and mechanism subsystem. One bridge seat apparatus(6) is installed to each continuous combining portion of each span beam.