| 摘要 |
The present invention relates to a fastening apparatus (300) which fastens at least two concrete piles to extend the concrete piles. The fastening apparatus (300) includes: a first fastening unit (100) which is coupled to the lower end of a first pile (1); and a second fastening unit (200) coupled to the upper end of a second pile (2). The first and second fastening units (100, 200) respectively have a plurality of fastening holes (21, 121) at equivalent intervals on the side surfaces for mutual fastening thereof and have a center matching groove (22) and a center matching bar (112) formed to match the centers of the fastening holes (21, 121) during a fastening operation. |
