| 摘要 |
PROBLEM TO BE SOLVED: To construct a high-pressure injection/agitation pile with high efficiency and economy at great depth or in a small working environment by performing the operation of switching between drilling and construction by pressurizing or depressurizing a high-pressure fluid at a certain position without the need to withdraw and reinsert an injection pipe, while preventing compressed air from being blocked by the intrusion of soil particles generated in an air nozzle and an airflow passage, using a self-drilling injection device to be attached to the tip of the injection pipe for a high-pressure injection/agitation pile construction method which includes injecting the fluid and the compressed air from a jet nozzle to drill soil in the ground within a given range of construction, and consolidating the ground. SOLUTION: The self-drilling injection device comprises a jet nozzle, a differential pressure valve, and a drilling bit. The airflow passage is used also as a flow passage for drilling fluid or compressed air, so that a differential pressure valve blocks or releases the communication between the airflow passage and the drilling fluid flow passage depending on whether a high-pressure flow passage is pressurized or depressurized. The drilling operation and construction can be continuously switched from one to the other to improve construction properties and stable injection of the compressed air. COPYRIGHT: (C)2004,JPO
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