This is a
mechanized tunneling technology by Semi-Shield / Shield TBM. This
machine is determined in soil type according to the geological
features. It is set undergound for operation at the vertial casing
of excavation. It is equipped with cylinder-typed construction
outside - pipe or segment consisting of cutter head, main machine,
slurry system.
There are two types of earth pressure balance shield and a slurry
shield.
