| 摘要 |
PURPOSE:To improve working efficiency, by a method wherein a bit is attached to the one end of a rod, a drilling machine is attached to the other end, and after bedrock is bored down to a given depth, a grout material is poured as the rod and the bit are left standing. CONSTITUTION:A shunk adaptor 14 is attached to a rod 11 provided at its forward end with a bit 12, a drilling machine 15 is attached to the adapter 14, and bedrock A is drilled down to the depth equal to the length of the rod. The adapter 14 is removed, and after the additional rod 11 is connected for drilling, the bedbrock is similarily drilled to depth equal to a set anchor length. The adapter 14 and the drilling machine 15 are removed in a condition that the rod 11 and the bit 12 are left in the bedrock. After a grout pump 16 is connected to the rod 11 through a coupler 17, a grout material B is poured through the inner hole of the rod 11 with the aid of the pump 16. Further, after the grout material B is cured, a seat metal18 is enaged with the end part of the rod 11, a nut 19 is threadedly joined with a screw part 11b for tightening. |
