The dual-mode shield possesses both advantages of EPB and SPB, it is used in wide geological condition with clay, sandy soil, soft & hard compound stratum and rich water stratum. It owns both the good geology adaptability and using economical efficiency. Under EPB mode, it uses chamber’s muck to balance the tunnel face’s pressure and deliver muck with screw conveyor. Under SPB mode, it uses chamber’s slurry to balance the tunnel face’s pressure and deliver muck with slurry pipe. According to user’s construction demand, the two modes can be switched freely in the tunnel.
|excavation diameter||6280 mm|
|total length||105 m|
|Min. curve radius||250 m|
|articulation type||passive articulation|
|total power||1500 kW|