METHOD FOR PURIFYING EXCAVATED SOIL WHEN SHIELD CONSTRUCTION IS PERFORMED IN CONTAMINATED SOIL AND SHIELD EXCAVATOR

摘要

PROBLEM TO BE SOLVED: To provide a technique which realizes more efficient purification processing and which can maintain favorable tunneling environment by effectively utilizing a shield machine itself in excavated soil purification processing when shield construction is performed in a contaminated soil.

SOLUTION: A method for purifying the excavated soil when performing shield construction in the contaminated soil, includes a step of adding a purifier for the contaminated soil to a ground by a shield face, a step of stirring and mixing the excavated soil D1 taken inside a chamber 13 of the shield machine by a stirring means 14, and a step of transferring the stirred excavated soil inside the chamber to the outside of the chamber. If the contaminated soil contains a volatile organic compound, an ultrafine iron powder solution and a fine powder activated carbon solution are used as the purifier.

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