| 摘要 |
PURPOSE:To form a ground having a high water shielding effect by a method in which a pit is excavated by a reverse construction work, deep stratum is excavated by means of a pressure jet stream and at the same time a space is formed while discharging soild by the reverse work, and then a ground hardening agent is charged into the space. CONSTITUTION:The ground is excavated by an excavating blade 4 while turning a reverse pipe 5 by a rotary table 1. And, an excavating water is supplied and circulated in the excavated pit 19 to pump up and discharge excavated soil and sand to the gound's surface. After the excavation to a given depth by a reverse construction work, a superhigh pressure water and compressed air are supplied and jetted from a nozzle 17 into the pie 19 by means of a superhigh pressure pump to excavate the deep layer of the ground and at the same time to form a space 22. While raising and turning the reverse pipe 5, a ground hardening agent 3, e.g., a grout, is jetted under high pressure sideways from the nozzle 17 through a grout pipe 16 by operating a grout pump. Thus, the space 22 is filled with the hardening agent 23. |
