| 摘要 |
PURPOSE:To permit the construction of large-diameter in-situ cast piles in narrow construction site by a method in which an aligned-pillar type continuous wall is formed in a circular form, the inside ground of the continuous wall is excavated while supplying mud water, and the mud water is sucked up, together with excavated soil and sand, while utilizing the casing of the adjacent continuous wall as a mud water tank. CONSTITUTION:An aligned-pillar type continuous wall is formed by plural piles 5. And, while turning a bit 8 and continuing excavation for a pit, mud water is supplied through a hollow pile 11 made up by the adjacent aligned-pillar type continuous walls. Excavated soil and sand are back-filled to the pit of the hollow pile 11 through the pipe 18 from the hollow of a drill shaft 9 by means of a reverse pump 17. |
