28
2013-08
Classification of Shield Tunneling Methods
There are many types of tunnel boring machines, and they can be classified in various ways. Based on the excavation method—whether manual or mechanical—they are divided into hand-excavated shields and mechanized shields. Additionally, depending on how the working face supports the soil, shields can be categorized as open-type or closed-type. Finally, shields can also be classified according to their design and excavation techniques, falling into either hand-excavated or mechanically operated categories.
2013-08-28
139, Fengrun East Road, High-tech Development Zone, Luoyang City, Henan Province, China
