盾构是一种挖掘隧道用的工程机械。盾构施工是在一个能支撑地层压力而又能在地层中推进的圆形(或矩形和马蹄形等特殊形状)钢筒结构的掩护下,完成挖掘、出土、隧道支护等工作,它的最大的特点就是整个隧道掘进过程都是在这个被称做护盾的钢结构的掩护下完成的,可以最大限度地避免坍塌和地面塌陷。 Shield is a tunnel excavation engineering machinery. Shield construction is carried out under the cover of a circular (or rectangular and horseshoe-shaped) steel cylinder structure capable of supporting formation pressure and propulsion in the formation, and excavation, excavation, tunnel support and the like are completed. Its maximum The feature is that the entire tunneling process is done under the guise of a steel structure called a shield that will minimize collapse and ground collapse.