| 摘要 |
PROBLEM TO BE SOLVED: To easily and accurately excavate an excavation hole of a rectangular shape in a top view while crushing surely a relatively large stone without causing the clogging of the stone between lower rotors with rotary blades and an excavation residue.SOLUTION: This excavator is juxtaposed via a first clearance 6 with the plurality of lower rotors 5 with the rotary blades suspended from the ground by a wire-like material 1 and inserted into soil 2. The rotary shaft 4 is laid horizontally in a lower part of an excavator body 3 going down and coming up in the soil 2. An intermediate rotor 8 with a rotary blade of which the rotary shaft 7 is laid horizontally is arranged in an upper position of the first clearance 6. The second clearance 9 is formed between the lower rotors 5 with the rotary blades and the intermediate rotor 8 with the rotary blade. |
