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'J-Pocket Pile', which was developed especially for cut-off walls at sea area waste disposal sites, has been improved in order to expand its applicability at land area. As a result, weight reduction was obtained by combining with the wide-width steel sheet pile, and a new type sealing material was additionally applied. By applying improved shapes of the joint portion, and by conducting an on-site installation test and a water shielding performance test, it was confirmed that it ensures the performance nearly equivalent level to the conventional type. In the future, JFE Steel intend to conduct installation tests under more diverse conditions and work to further improve this technology in order to achieve wider diffusion of 'J-Pocket Pile' as a steel cut-off wall.