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US 5,180,252 AGranted
Earth pressure system shield process
AssigneesKabushiki Kaisha Konoike Gumi, Kabushiki Kaisha Komatsu Seisakusho
InventorsHiroshi Tanaka, Ryoji Kobayashi
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AssigneesKabushiki Kaisha Konoike Gumi, Kabushiki Kaisha Komatsu Seisakusho
InventorsHiroshi Tanaka, Ryoji Kobayashi
Estimating the term…
The 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 an excavated soil and a mud improving main agent is added (Ic, P.sub.2) to the 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 soil discharge screw conveyor (3) to sufficiently mix the excavated soil with the improving main agent and a mud improving assistant agent is then added (5) inside the soil discharge screw conveyor (3), so that the seal covered by the improving main agent so as not to be disssolved in water is removed chemically by this assistant agent. In this manner, the excavated soil is improved to a high quality soil having low fluidity inside the soil discharge screw conveyor (3) and is discharged. As described above, the improving main agent and the improving assistant agent are mixed continuously, and at the same time a cut-off plug zone is formed inside a mixing screw conveyor (3.sub.3), and a cylinder portion (15) not having a soil and gravel conveyor means is disposed at the rear end of the conveying screw conveyor (3.sub.2) 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.
In an underground tunneling process, which comprises excavating underground soil from the working face of an underground tunnel excavation, discharging a mud comprised of excavated soil and water into a mixing chamber and then feeding the mud through a soil discharge screw conveyor to a location spaced from said working face and said mixing chamber, the improvement which comprises;
In an underground tunneling process, which comprises excavating underground soil from the working face of an underground tunnel excavation, discharging a mud comprised of excavated soil and water into a mixing chamber and then feeding the mud through a soil discharge screw conveyor to a location spaced from said working face and said mixing chamber, the improvement which comprises;
Dependencies are inferred from the claim text.