JP2003064659A5 - - Google Patents

Claims (2)

Provided on both sides of the hollow main rotating shaft having the stirring blades are hollow auxiliary rotating shafts having stirring blades shorter than the main rotating shaft, and are rotated around the rotating shaft and lower portions of the respective sub rotating shafts by the separation holding members. A small-diameter main excavating blade and a large-diameter enlarged excavating blade are provided at the lower end of the main rotary shaft, and a small-diameter sub-excavating blade is provided at the lower end of each sub-rotating shaft. A large-diameter sub-extended drilling blade is provided, the enlarged excavating blade and the sub-excavated blade are positioned at substantially equal heights, and the main rotary shaft and the sub-rotary shaft are rotated in the opposite directions, whereby each of the excavating blades uses the ground. Excavating the soil, discharging the soil hardening material from the rotating shaft, and agitating the excavated soil with a stirring blade to improve the ground.   A hollow sub rotary shaft shorter than the main rotary shaft is disposed on both sides of a hollow main rotary shaft having a small-diameter main excavating blade at the lower end, and the main rotary shaft and the lower part of each sub rotary shaft are provided. The vicinity of the auxiliary rotating shaft is rotatably supported by a separation holding member, a small-diameter auxiliary excavating blade is provided at the lower end of each auxiliary rotary shaft, and a large-diameter auxiliary enlarged excavating blade is provided above the auxiliary excavating blade. A large-diameter enlarged excavating blade is provided on the main rotating shaft at a height position substantially equal to the excavating blade, an agitating blade for stirring excavated soil is provided on the main rotating shaft and each sub-rotating shaft, and the main rotating shaft is provided. A ground improvement excavator characterized in that the rotating shaft and each auxiliary rotating shaft rotate in opposite directions.