第四章第五节中心螺旋机出土式土压盾构一、本施工法的特点土压盾构的基本工作原理是:使开挖土砂在土仓内始终保持充满状态,同时不断地用螺旋运输机将开挖的土砂排出。然而,开挖土砂在土仓内的充满程度与开挖土砂的均匀排出又形成了一对矛盾,要使土仓中的土砂量和排出量都处于理想状态就较难作到。为了克服这一困难就研制出了中心螺旋出土式土压盾构。 Chapter IV Section V Center Excavating Earth Pressure Shield I. Characteristics of this Construction Method The basic working principle of earth pressure shield is that the earth and sand should be kept fully filled in the soil silo while the spiral Transporter will excavation of sand discharge. However, there is a contradiction between the fullness of excavation of earth and sand in the silo and the uniform discharge of excavated earth sand. It is more difficult to make the amount of sand and discharge in the earth silo in an ideal state. In order to overcome this difficulty, a central spiral excavated earth pressure shield has been developed.