| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a press-in construction method of a sheet pile, easy in installing a chuck, and capable of fixing a sheet pile upper end part by the chuck, without reversely operating an auger machine.SOLUTION: A plurality of rotatingly driven drilling shafts 4 and 5 are arranged in a cross-sectional elliptic support pipe 3, and chucks 7 and 8 are respectively provided in an upper part on one side surface 3a side and the other side surface 3b side of the support pipe 3, and eccentric drilling bits 9 and 10 extractable from the inside of a foundation are installed in a tip part of the respective drilling shafts 4 and 5 via dowm-the-hole hammers 11 and 12 so that a bit body does not collide with the sheet pile 6 after completing press-in of the sheet pile, and the sheet pile 6 is supported by the support pipe 3 by using a multi-shaft drilling device 1 being the substantially same as a sheet pile width in a maximum width of a composite locus circle formed so as to partially overlap by rotation of the eccentric drilling bits 9 and 10, and an upper end part is fixed by the chuck 7, and the sheet pile 6 is pressed in, while drilling the foundation by the rotary striking action of the respective eccentric drilling bits 9 and 10 struck by the down-the-hole hammers 11 and 12.</p> |
