CONSTRUCTING METHOD OF UNDERGROUND CONTINUOUS WALL IN UNDERGROUND OBSTRUCTION EXISTING GROUND

PURPOSE:To construct an underground continuous wall by removing an underground obstruction difficult to be excavated by an earth auger, etc., and building a dummy ground equal to a normal ground to a ground after the removal. CONSTITUTION:A cylindrical frame 1 is disposed in upright to a ground, in which there is an underground obstruction, the underground obstruction is removed while preventing the falling-in of ground soil in the cylindrical frame and in the lower section of the cylindrical frame by a viscosity conditioner, a vertical pit is dug, and cement milk and soil and sand are charged into the vertical pit and kneaded and solidified, thus forming a master dummy ground 11. A slave dummy ground 15 is formed in the ground at a position separate from the master dummy ground through the same means, and an interposing dummy ground is shaped at a position interfering in the master dummy ground and the slave dummy ground through the same means again. Accordingly, unifying with the master/slave dummy grounds is repeated, and an interrupting dummy ground, which can be excavated and which has solid properties corresponding to a normal ground, is formed in the ground, and the interrupting dummy ground is excavated, thus constructing an underground continuous wall.