| 摘要 |
PURPOSE:To permeate a high-speed air current positively into the ground together with a high-speed jet liquid by backward mounting a chemical injection nozzle into a compressed air injecting port and forming a high-speed air current throttling section with the same diameter as the diameter of the injection of the high-speed jet liquid in front of the nozzle. CONSTITUTION:The compressed air injecting port 2 is opened to the outer pipe 4 of a triple pipe bit 3, and communicated with an air feed passage 6 between the outer pipe 4 and an intermediate pipe 5. The chemical injection nozzle 7 is arranged at the center of the injector port 2, and the nose is disposed to the rear section of the injecting port 2 and fixed to the intermediate pipe 5, and communcated with the chemical passage 9 of an inner pipe 8. A throttling hole 10 is set in the same diameter as the diameter d of the injection of the high-speed jet liquid 12 injected from the nozzle 7. Accordingly, when the high-speed jet liquid 12 injected from the nozzle 7 passes through the throttling hole 10 of an attachment 11, the liquid is ejected into the p]it scraped while pulling in the high-speed air current in the injecting port 2, and permeates into the ground. |
