| 摘要 |
<p>This invention relates to an earth pressure system shield process. First of all, an excavation additive consisting of the mixture of an agent for improving fluidity and viscosity of excavated soil and a mud improving main agent is added (1c, P2) to excavated soil at the time of shield excavation at the working face, inside a mixing chamber (1b) of a shield machine (1) and inside a screw conveyor (3) for discharging soil to sufficiently mix the excavated soil with the improving main agent and a mud improving assistant is then added (5) inside the screw conveyor (3), so that the seal covered by the improving main agent so as not to be dissolved in water is removed chemically by this assistant. In this manner, the excavated soil is improved to quality soil having low fluidity inside the screw conveyor (3) for discharging soil and is discharged. As described above, the improving main agent and the improving assistant are mixed continuously, and at the same time a cut-off plug zone is formed inside the screw conveyor (33) for mixing, and a cylinder portion (15) not having a soil and gravel conveyor means is disposed at the rear end of the conveying screw conveyor (32) so as to form the cut-off plug, to prevent explosion of the discharged soil, to prevent collapse of the working face and to make the soil discharge work easy.</p> |
