SLURRY FEEDING SYSTEM IN SLURRY SHIELD METHOD, AND METHOD

摘要

PROBLEM TO BE SOLVED: To make the feed part of slurry provided on a partition wall to the necessary minimum and contrive securing of simple and optimum muddy preparation effect by controlling a slurry feed part by a control means, and feeding slurry preparing the property through the slurry feed part to a chamber. SOLUTION: Slurry of different properties is simultaneously fed from a plurality of slurry feed parts 40-1, 2. At the time, the case of a mutual layer whose property of a heading 300 is different exists so that the upper side is sand quality earth layer 302 and the lower side is a silt and clay layer in the same excavation cross section. A viscosity increasing agent and a clogging agent are added to the upper part of slurry in a chamber 20, and slurry adding a distribution agent is fed in the lower part to stabilize the heating 300 so as to be excavated. In addition, a slurry property is prepared by a controller 6 on the basis of the measurement result of a slurry property measuring system. The slurry property of the feed part is measured to prepare the property of slurry fed tot the part so as to precisely enable slurry preparation. Thereby even in the case of a large bore shield and the mutual layer, the slurry property in the chamber 20 can be prepared most suitably.