Construction method of foundation pile, foundation pile structure and double ready-made pile

摘要

PROBLEM TO BE SOLVED: To enhance horizontal and vertical strength of each pile hole, by combining outside and inside precast piles while not enlarging an excavated diameter of the pile hole and maintaining work efficiency.;SOLUTION: A pile hole 3 (a pile hole shaft part 4, a widened diameter part 5) is excavated to a bearing ground, and a consolidation liquid 6 is filled (a). An outside precast pile 10 (a lower pile 10A, an upper pile 10B) is embedded in the pile hole 3, and annular protrusions 14a, 14b are positioned inside a solidification liquid 7 (b). Soil cement, mud, and other matters accumulated in a hollow part 12 of the outside precast pile 10 is discharged on the ground using a spiral rod 52 (c). The hollow part 12 of the outside precast pile 10 is emptied (d). The inner solidification liquid 7 is filled inside the hollow part 12 of the outside precast pile 10 (e). An inside precast pile 20 (a lower pile 20A, an upper pile 20B) is embedded in the hollow part 12 of the outside precast pile 10, and an annular protrusion 24a of the inside precast pile 20 is positioned inside the lower solidification liquid 7 (f). Top edge parts of the inside and outside precast piles 10, 20 are connected by a connector 40, to form a precast pile 30 of the present invention.;SELECTED DRAWING: Figure 2;COPYRIGHT: (C)2018,JPO&INPIT