Removal method of existing underground wall and reconstruction method of building

摘要

PROBLEM TO BE SOLVED: To provide a removal method of an existing underground outer wall and a reconstruction method of a building capable of efficiently removing an existing underground outer wall.SOLUTION: A semicircular earth retaining wall 20 is constructed while excavating the soil around a part of an existing underground outer wall 12 which interferes with an under-ground piled column 18C of a new building. In a state where the circumference of the interfering existing underground outer wall 12 is exposed, the interfering part of the existing underground outer wall 12 is cut off by means of a wire saw method and removed. After that, the under-ground piled column 18C is constructed in the portion where the interfering part is removed.