除了明挖法施工,修建地铁还可以使用矿山法暗挖施工:建一个小小的施工坚井,施工人员从坚井下去,像“土拨鼠”一样在地下建造车站或隧道。可是,地铁绕路既长及复杂,光靠人工挖太浪费时间了。终于轮到它出场了。快闪开,“钢铁蚯蚓”——盾构机来啦!它可以在漆黑的地下边挖边前进。它经过的地方,一条长长的隧道就建成了。 In addition to the Ming dug construction, the construction of the metro can also use the mining method excavation: a small construction of a well, the construction workers from the well to go down, like “woodchuck ” in the underground station or tunnel construction. However, the subway detours are both long and complex, and it is a waste of time by artificial digging alone. It finally turn it played. Quick to open, “Steel Earthworm” - Shield Machine Come! It can dig in the dark underground edge. Where it passed, a long tunnel was built.