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采用盾构作为施工机械、在地层中修建隧道和大型管道的暗挖式施工法称盾构法。其施工特点是在盾构前端切口环的掩护下开挖土体,在盾尾的掩护下拼装衬砌,挖去前面土体后用盾构千斤顶顶住拼装好的衬砌,将盾构推进到挖去的土体空间内,当盾构推进距离达到一环衬砌宽度后,缩回盾构千斤顶活塞杆进行衬砌拼装再挖至新的进程,如此循环交替,逐步延伸而建成隧道。盾构的基本构造是由壳体、推进设备、衬砌拼装机等组成。其壳体通常为圆筒形的装配式或焊
Shield construction is used as a construction machinery, and tunneling and large-scale tunnel construction in the stratum is called the shield method. Its construction is characterized by excavation of the soil under the shield of the front cutout ring of the shield and assembly of the lining under the cover of the shield at the tail of the shield. After excavating the soil in front of the shield, the shield jack is used to withstand the assembled lining and the shield is pushed to dig Go to the soil space, when the shield to promote the distance to reach a ring lining width, the retract shield jack piston rod lining assembly and then dredged to a new process, so alternating cycles, and gradually extended to build the tunnel. The basic structure of the shield from the shell, propulsion equipment, lining assembled machines and other components. Its housing is usually cylindrical assembly or welding