REINFORCING WORK OF DEEP GROUND LAYER BY MIXING AND SOLIDIFICATION

PURPOSE:To obtain sufficient strength to horizontal forces by a method in which a solidifying agent, e.g., cement, etc., is injected into a soft ground and mixed with stirring to form solidified soil columns, and before the soil columns harden, a material having high tensile strength, e.g., steel bars, etc., is inserted in an arranging manner into the soil columns for reinforcement. CONSTITUTION:Plural soil cement column rows 10 are concurrently formed by using many stirring mixers set in rows, and three (for example) reinforcing bars 12 are linearly inserted biasedly to one side into each of the column rows 10 before they harden. After the column rows 10 are completely hardened, one side (the opposite of the side where the reinforcing bars 12 are biasedly set) of the column row 10 is excavated, whereupon soil pressure is acted in the direction of arrow A from the opposite side of the excavated side, and a tensile force acts on the side where the soil pressure acts and a compressive force acts on the opposite side. Since the bars 12 are set biasedly to the soil pressure-acting side for reinforcement, great reinforcing effects can be obtained by a minimum number of the reinforcing bars 12.