| 摘要 |
PURPOSE:To improve horizontal stress resistance between each of adjacent compaction sand piles positively by applying a torsional vibration to a cylindrical body penetrated into soil and supplying space generated among a blade member on the outer circumference of the cylindrical body and soil and sand with soil and sand in the cylindrical body through a through-hole. CONSTITUTION:A cylindrical body 10, to the lower section of the outer circumference thereof a plurality of plate-shaped blade members 12 are fixed, is penetrated down to the predetermined depth of ground 16, and soil and sand 18 for preparing compaction sand piles is charged into the cylindrical body 10. The cylindrical body 10 is lifted only by a fixed quantity, vertical vibrations and alternating torsional vibrations are applied, and one part of the compaction sand pile is prepared at the nose of the cylindrical body 10. A moving cover 28 is lifted by a cylinder 24 at that time, and space generated among the blade members and soil and sand is supplied with soil and sand in the cylindrical body 10 through an opened through-hole 22. Accordingly, an adverse influence due to the insufficient filling of soil and sand is prevented, and horizontal stress resistance between each of the adjacent sand piles can be increased positively. |
