| 摘要 |
PURPOSE:To prevent the intermixture of soil and sand in a solidfying agent by a method in which after an earth auger penetrated into the ground under a condition that its tip is projected from an underground pile cylinder reaches a given depth, the cylinder and the auger are penetrated to the lower end of an excavated pit before the injection of the solidifying agent. CONSTITUTION:A cylinder body 1 used for an underground pile is turned, the soil in and around the tip of the cylinder 1 is excavated by an earth auger 5, and the cylinder 1 is penetrated while discharging the excavated soil to the outside of the cylinder 1 under the guidance of the soil and sand (a) clogged in the cylinder 1 by the synergistic action of the auger 5 and compressed air. Then, under a condition that the tip of the auger 5 is projected from the cylinder 1, both the cylinder 1 and the auger 5 are penetrated into the ground, and after the tip of the cylinder 1 reaches a given depth L1 in a bearing stratum A, only the cylinder 1 is penetrated to a position at the same level as the lower end of the excavated pit (b) formed by the auger 5 before injection of a solidifying agent. |
