| 摘要 |
The present invention relates to a pile installed underground including extending pieces (2, 2a) capable of forming a pile extension unit on a part of a pile body (100). The extending pieces (2, 2a, 2b) are composed of multiple extending bodies (6) forming the pile extending unit by being radially extended, and an extension supporting unit (12) guiding an extension direction of the multiple extending bodies (6) and delivering an upper load to the ground under the pile extending unit. The extension supporting unit (12) is composed of an upper plate (14), a lower plate (16), and a middle supporting unit (18) and formed by filling a mold with a curable joining filler and forming into one body by pressing or molding after curing. The multiple extension bodies (6) are arranged to fill the bottom surface of an extension body receiving space (20) on the outer side of the middle supporting unit (18) before extension. A rotary cutting tip (4) for extending-cutting is mounted on the outer side of the extending bodies (5). If using the pile capable of extending by itself, the number of the piles to be constructed is reduced as an allowable bearing capacity and drawing resistance of each pile in various strata not only a normal soil layer but also a firm bedrock layer can be remarkably increased so that construction costs and a construction period are reduced. In addition, the present invention obtains the excellent economic efficiency, thereby increasing a pile application arrange such as a construction using a pile foundation instead of entrenching or using a direct foundation. |
