METHOD AND DEVICE FOR IMPROVING GROUND BY USING POWDER IMPROVER AND POWDER SUPPLY APPARATUS

摘要

PURPOSE: A ground improvement method by using a powder improver and a device thereof, and a powder supply apparatus are provided to maintenance convenient, to transfer large amount of improver, and to reduce the size of the apparatus by injecting the solidifying material securely and restricting counter flow of powder with simple structure. CONSTITUTION: An opening part of a switching pipe(2p) of a switching unit is connected to a first discharge port(2a) when a lower injection port(1b) is placed as far from the lowest end as the distance between the lower injection port and an upper injection port(1u) during inserting an improvement rod(1). A solidifying material supply unit(3) injects solidifying powder and compressed air to the lower injection port to insert the improvement rod with rotating. The opening part of the switching pipe is connected to a second discharge port(2b), and the solidifying powder and compressed air are injected to the upper injection port to move up the improvement rod with rotating.