SUPERHIGH PRESSURE INJECTION NOZZLE, BORING MACHINE, CUTTING OBSTACLE SYSTEM AND METHOD OF USING SUPERHIGH PRESSURE INJECTION NOZZLE

摘要

PROBLEM TO BE SOLVED: To provide a superhigh pressure injection nozzle for preventing a clog with a simple structure.SOLUTION: A superhigh pressure nozzle 40 is provided with a nozzle body which has an injection port 42 and a cap 50 which covers the injection port outside the nozzle body and of which position relationship to the nozzle body is fixed. According to such a superhigh pressure injection nozzle, sediment does not enter into the injection port so a clog is not formed as the injection port is covered by the cap until the superhigh pressure injection nozzle reaches a sight to be used underground.SELECTED DRAWING: Figure 2