The following information comes from the Internet, edited by Brightway Separation Plant. Brightway Company focuses on the slurry separation, mud recycling, mud circulation in shield tunneling construction.

Shield Tunneling Machine is a large high-tech comprehensive construction equipment for tunneling project. The shield is equipped with excavation, drainage, assembly and propulsion machinery. The construction of tunnel structure is completed by the series operation of soil excavation, ballast-soil transportation, lining assembly and shield construction.

There are three different types slurry shield tunneling machine. Each type of tunneling machine is suitable for different environments.

1. Open single shield machinefor stable and usually non water-bearing ground conditions with excavation under atmospheric pressure and dry muck removal with belt conveyor.

2. Closed earth pressure balance machine (EPBM) for fine-grained and usually unstable and water-bearing soils with excavation under controlled positive face support pressure and thick-matter-type muck removal from the excavation chamber with screw conveyor

3. Closed slurry machine (STBM) for coarse-grained and usually unstable and water-bearing soils with excavation under controlled positive face support pressure and muck removal from the excavation chamber with slurry circuit and above ground slurry treatment plant.

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