| 摘要 |
PROBLEM TO BE SOLVED: To perform excellent construction even in the natural ground or the like in which the inner surface of a borehole is liable to be collapsed due to a large volume of spring water or the like regarding a construction method of a locking bolt used in the case of reinforcing the natural ground in tunnel construction work or the like, particularly an expandable locking bolt whose locking bolt body of a hollow pipe shape inserted in the borehole is expanded with fluid such as water and anchored to the inner surface of the borehole.SOLUTION: The borehole (h) for inserting the locking bolt is bored in the natural ground G to construct the expandable locking bolt 1, and a casing pipe 10 enlargeable in diameter is inserted in the borehole (h). The expandable locking bolt 1 is inserted in the casing pipe 10, and the locking bolt 1 is radially expanded with the fluid such as water while enlarging the diameter of the casing pipe 10 to pressure-bond and fix the locking bolt 1 and the diameter enlarged casing pipe 10 to the inner surface of the borehole. |
