UNDER GROUND TOP-DOWN METHOD

摘要

A top-down construction method of an underground structure is provided to endure lateral earth pressure applied on an underground retaining wall safely. A top-down construction method of an underground structure comprises: a step for building a retaining wall body(10) underground; a step for punching the location in which a main column is installed and setting up a steel column; a step for forming a top-down construction ground by digging inside the retaining wall body; a step for setting up a reference line on the top-down construction ground; a step for coupling both ends of steel beams(40) to the retaining wall body and the steel column respectively by arranging the steel beam on the reference line; a step for manufacturing a slab(60) which is connected to the retaining wall body and in which a concrete inclined sleeve hole is formed; a step for repeating from the excavation step to the slab manufacturing process until a basement floor is formed; and a step for making a retaining wall(70) coupled with the retaining wall body and connected to the ground.