| 摘要 |
PURPOSE:To permit a crushed stone-piling work to be performed even in the vicinity of an important installation by a method in which crushed stones are packed on the outside of a small tube provided in a hollow formed inside a casing to be set underground, the casing is pulled out, and a vibrator is set and pulled out with the small tube while applying vibration to the crushed stones by the vibrator. CONSTITUTION:Bottom-filling crushed stones 4 are charged into the hollow 3 deprived of soil in a casing 1 made of a hollow, round steel tube, and a steel small tube 5 is set in the hollow 3. Then, inner-filling crushed stones 6 are packed on the outside of the small tube 5 to the level of the ground, the casing 1 is slowly pulled out, a vibrator 8 is set in the small tube 5, and the small tube 5 is pulled up while applying a vibration to the crushed stones by the vibrator 8. Slightly later, the vibrator 8 is completely pulled up, together with the small tube 5, to complete a strong crushed stone pile. |
