| 摘要 |
A boring method that is able to construct piles of a prescribed diameter and enables mud waste generated in the formation process to be disposed of as surplus earth. Upper and lower jetting units with jetting nozzles are provided on the lower end of a multi-cylinder rod. Compressed air and water are jetted from the upper jetting unit (61,62) to cut a ground improvement region and drain away mud waste produced in the process. The lower jetting unit (71,72) has jetting nozzles oriented in mutually opposite directions. One nozzle jets into cement milk into the ground to harden the earth, and the other nozzle supplies a reagent that hardens the cement milk, to accelerate the ground hardening and construct a pile of the prescribed diameter. |
