| 摘要 |
PROBLEM TO BE SOLVED: To provide a self-drilling monitor improving drilling efficiency and reducing loss of drilling water by eliminating useless discharge of drilling water from a solidifying material liquid jet nozzle in drilling, and a high-pressure jet mixing method. SOLUTION: The self-drilling monitor includes a drilling water jet nozzle 4 at a lower end, and a solidifying material liquid jet nozzle 5 at a side part, and has a built-in liquid passage 7 serving as both a liquid passage for force-feeding the drilling water to the drilling water jet nozzle 4, and a liquid passage for force-feeding the solidifying material liquid to the solidifying material liquid jet nozzle 5. A monitor plug 10 is mounted in the solidifying material liquid jet nozzle 5. The monitor plug 10 is formed with a conical part 10b formed to be gradually smaller in diameter toward the tip to correspond to the inner peripheral surface shape of the solidifying material liquid jet nozzle 5 formed in a conical shape so that the inner peripheral surface gets gradually smaller in diameter toward the tip. The monitor plug 10 is formed to block the solidifying material liquid jet nozzle 5 when drilling and to be pushed out of the nozzle 5 by jet pressure of the solidifying material liquid when improving soil. COPYRIGHT: (C)2011,JPO&INPIT
|
