CONTAMINATED SOIL PURIFICATION METHOD, AND PARTITION WALL BODY

摘要

PROBLEM TO BE SOLVED: To provide a contaminated soil purification method for resolving a problem with a conventional technology that, when an all-casing method is adopted, inefficiency results due to overlapping of a part of adjacent improvement bodies, and a partition wall body used with the same.SOLUTION: A contaminated soil purification method of the present invention is the method that purifies soil in a selected range, by constructing a columnar improvement body while made to partially overlap with each other. The contaminated soil purification method includes an excavation step, a compartment formation step, a body part back-fill step, an overlapped part back-fill step, and a pull-out step. In the compartment formation step, a partition wall body is erected in a casing excavated by an all-casing method, and a main compartment is formed at an overlapped part by the casing and the partition wall body. In the body part back-fill step, the body part is back-filled with clean soil. In the overlapped part back-fill step, the main compartment is back-filled with excavated contaminated soil or a recycled material separable from the contaminated soil.SELECTED DRAWING: Figure 7