PARTITION WALL, METHOD FOR INSTALLING THE SAME, AND DEPOSIT TREATMENT METHOD

PROBLEM TO BE SOLVED: To provide a damper that increases a damping force by an increase in relative displacement between lower and upper structures.SOLUTION: When deposit treatment is performed in a hollow structure having an internal space in which a plurality of lifting and lowering spaces for moving an object upward and downward are set in the state of being juxtaposed on horizontal right and left sides across an intermediate beam, a partition wall partitions the hollow structure. The partition wall includes a lightweight section steel material that is positioned between the lifting and lowering spaces adjacent to each other and provided between the two intermediate beams vertically disposed at a mutual spacing in the state of facing each other, and a wall member that is fixed to the lightweight section steel material and that divides a working space for the treatment in a sealed state by partitioning the inside of the hollow structure into horizontal right and left sections.