| 摘要 |
PROBLEM TO BE SOLVED: To make an agent reach within a wide range in the ground, reduce surplus material's amount of leakage to the non-contaminated ground or ground surface, and shorten a construction period.SOLUTION: A mouth pipe 100 comprises an upper packer 101 and a lower packer 102. The mouth pipe 100's lower part is inserted into a mouth pipe insertion hole obtained by drilling from the ground surface 200 to a predetermined depth (for example, to the contaminated ground). A jet pipe for jetting an agent under high pressure into an agent injection region in the contaminated ground is inserted into the inside of the mouth pipe 100. A lower part packer 102 is arranged at the lower end of the mouth pipe 100, and occludes a gap between the outer peripheral surface of the mouth pipe 100 and the mouth pipe insertion hole by expanding during construction. The upper packer 101 is arranged at the upper end of the mouth pipe 100, and occludes a gap between the outer peripheral surface of the jet pipe and the inner peripheral surface of the mouth pipe 100 by expanding during the construction. |
