Скачать или смотреть EPB Shield | Fast tunnelling technology with a broad application range

Stability through support pressure
A rotating cutting wheel equipped with tools presses against the tunnel face, loosening and conditioning the soil. The soil enters the excavation chamber through openings in the cutting wheel, where it mixes with the existing chamber filling of loosened and conditioned soil. Mixing arms on the cutting wheel and bulkhead knead the mass to the desired consistency. The pressure of the thrust cylinders is transferred via the bulkhead to the loosened and conditioned soil in the excavation chamber. When the external earth and water pressure is equal to the pressure of the supporting chamber filling, the necessary balance has been achieved to prevent heave or settlement on the surface.