| 摘要 |
PURPOSE:To simplify the connecting operation of rods as well as to shorten the period of operation by forming a grout injection path in a rod injection work in which drilling and grout injection are performed by using the same rod. CONSTITUTION:Drilling made by using a rod 1 tipped with a discharge port 6, an inner tube 8 is inserted into the rod 1 until its tip reaches near a discharge port 6 at the tip side of the rod, whereby forming plural grout injection paths (a) and (b). Grout is sent from each grout injection path, mixed at near the discharge port, and then discharged from the discharge port. By this, the connecting operation of the rod 1 can be attained only for the outer tube 2, and the drilling efficiency can be raised because of the quick connecting work. |
