类矩形盾构的空间利用率比圆形高30%~40%,它开挖的隧道断面宽度上和两台单圆盾构紧挨着开挖出的隧道差不多,高度上比容纳双线的大型圆隧道小很多,且双线隧道一次成型,不用破坏城市既有管线,又不破坏环境,尤其适用于都市核心区和旧城区轨道交通建设,更适合“螺蛳壳里做道场”的需求。 Class rectangular shield space utilization than the circular high 30% ~ 40%, the excavation of the tunnel section width and two single shield shield tunnel next to almost the same height than the double line Large circular tunnel is much smaller, and a double-lane tunnel forming, without undermining the city’s existing pipeline, without damaging the environment, especially for urban core areas and the construction of rail transit in the old city, more suitable for demand.