AN IMPROVED TOP-DOWN METHOD USING THE RETAINING WALL

摘要

PURPOSE: An improved top down method is provided to integrate each stratum slab with a retaining wall, to install a permanent outer wall separated from the retaining wall and to safely construct a underground structure unit of a building with firm structure. CONSTITUTION: An underground structure unit(20) installs a retaining wall(3) by inserting a braced wall(4) between supporting pillars(1) exposed on a ground. The exposed supporting pillars are integrally connected to hold pillars(2) by top down constructing. Then, each stratum slab(21) is installed to a base floor(A) of underground, and a permanent outer wall(22) is mounted to the stratum slab of a top portion from the underground base floor for being separated from the retaining wall. Thereby, the stratum slab is established in a top-down manner to engaged with the retaining wall. Then, the permanent wall is installed from a lower portion of the stratum for being separated from the retaining wall to safely construct the underground structure unit.