The present invention relates to a method of underground structures wall demolition and extension of unhaengjung, more particularly, subway relates to a method of unhaengjung wall demolition and extension of underground structures that can be constructed a new history does not interfere with the operation of the. That consists of the following work steps and dig up the dirt to concrete structures gulto installed by drilling a vertical file tosacheung at the upper side of the concrete structure to accommodate the metro rail and the interior floor is installed in the ground; Gulto the beotimbo installed in a vertical file at predetermined intervals in the longitudinal direction on both sides of the concrete structure and the operation steps of the fixed installation; The side walls along the side walls of the concrete structure to form a plurality of longitudinal perforations to remove the provision of gyeoksun form and put on the concrete saw wire perforations vertically / horizontally by the side wall after cutting, primarily by removing the side wall steps and; Forming the pillar support structure perpendicular to the side wall portion is removed from the first side wall, and the removing step, the upper surface of the concrete ceiling structure and comprising a reinforcement to be integrally fixed to the ceiling; After the first step to remove the side wall of the concrete structure has the characteristic to remove the side wall made of a second step of removing the remaining side wall.
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