CONTROL ON EXCAVATING ATTITUDE IN IMPROVING GROUND

PURPOSE:To keep the straightforwardness of excavation by a method in which the ground is excavated by normally and reversely turning an excavating blade horizontally set on the lower part of the rotary shaft in an intermittent manner. CONSTITUTION:A ground improver consists of a rotary shaft 1 to be vertically moved and also turned normally and inversely in an intermittent manner, horizontally set plural stirring blades 2 on the lower part of the shaft 1, and an excavating wing 3 with horizontally set plural blades 4 on the lower end of the shaft 1. In improving the ground, the shaft 1 is lowered to the ground, and the soft ground is excavated by repeatedly turning it normally and inversely in an intermittent manner. After the completion of given excavation, the shaft 1 is turned in the same direction while injecting cement milk orderly from the deep portion to stir the soil with the cement milk. Since the shaft 1 can be turned normally and reversely, the inclination of the excavation can be offset and the straight-forwardness of the excavation can be kept.