TOP-DOWN UNDERGROUND CONSTRUCTION METHOD USING PREFABRICATED CONCRETE COLUMN MEMBER AS TEMPORARY BRIDGE COLUMN

摘要

A top down construction method using a precast concrete column member is provided to reduce the construction period and the construction cost by using a general DRA method for construction. A top down construction method using a precast concrete column member comprises: a step for building a retaining wall(100) underground by a normal method; a step for installing a temporary column by driving a precast concrete column member in the ground; a step for digging the ground inside the retaining wall; a step for setting up a girder(240) between the temporary column and the retaining wall, and the temporary columns; a step for repeating from the digging ground step and the girder installation step to the basic level; and a step for arranging a column reinforcing rod and pouring foundation concrete(400) and forming a main column(300).