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How was the subway built?

Subway construction is very troublesome. The subway is built underground. In the process of construction, the distance between the track depth and the ground should be considered, and the deep place should be drilled directly by the drilling rig.

In deep construction, the ground shall be excavated in the open air first. When the excavation depth is sufficient for the depth to be built, drill holes directly in the direction of subway construction. After the drilling is completed, an exhaust hole will be built, and then workers will do protective construction in the hole, and arch protection will be built with reinforced concrete. The foundation is directly dug by excavator in the shallow place from the ground, and the frame is built with reinforced concrete. Finally, it was built like a house, and the shallow stratum was successfully built. All stations are built after excavation, and the platform is basically open-air. Occasionally, the construction principle of underground and shallow stratum track is the same. The construction of this series was completed before the track was completed and finally opened to traffic.

The construction process is very troublesome, and no disclosure can be made. The project is very detailed. The construction is very difficult and the process is very dangerous.