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平原地区的城市,为了深挖曾构筑一部份地道工程,虽然抗力好,用料省,但平时使用很困难:有的地道工程位于高水位地区,加以施工质量差,渗漏水严重,常年积水,平时无法使用;有的地道工程深埋20～30米,人员或货物出入极不方便,加以每年抽水电费较高,建设单位不想用;有的单位,在夏季利用地道工程的冷空气,为地上车间、办公楼和食堂等降温,使地道建筑内部结露严重,造成各种预埋铁件、管道、阀门、门上铰页把手和安装设备等锈蚀脱皮,徒而降低了地下工程的生命力。如果修建掘开式的地下工程,虽然平时好用,但占地面积大,抗力差,用料多,造价高。特别是城市地下管网多,地面建筑物密集,给工程施工和口部处理带来很大困难。
Cities in the plains area have built a part of tunneling projects for deep excavation. Although they have good resistance and materials, they are difficult to use at ordinary times: Some tunnel projects are located in high water areas, and the quality of construction is poor, and water leakage is serious. Water accumulation, which cannot be used at ordinary times; some tunnelling projects are buried 20 to 30 meters deep, making it extremely inconvenient for people or goods to go in and out. The annual pumping costs are high and the construction unit does not want to use it; some units use cold air for tunneling works in summer. , Cooling down on-ground workshops, office buildings and canteens caused serious condensation inside the tunnels, resulting in rust and peeling of various embedded iron fittings, pipes, valves, hinged door handles, and installation equipment, thereby reducing underground construction. The vitality. If the excavation of underground construction projects, although usually easy to use, but the area is large, poor resistance, more materials, high cost. In particular, there are many underground pipe networks in the city, and the buildings on the ground are dense, which brings great difficulties to the construction of the project and the handling of the mouth.