The Wanjiali Power Tunnel starts from Teli West Road in the south and ends at the planned Information Avenue North in the north, with a total length of about 7.6km. Teli Road-Laodaohe River North and Weisan Road-Boundary City Expressway North are shield sections. The shield section tunnel is a circular section with an inner diameter of 3.6m and an outer diameter of 4.1m, with a length of 5.1km.

This shield structure interval is located in Dongguan Metro Line 1 Daogao East Station ~ People's Hospital Station ~ Bus Terminal Station interval, the total length of 2.3km.

Φ6980 earth pressure balance shield supporting continuous belt conveyor design parameters ■ Conveying medium: slag soil ■ Design capacity: 370t/h ■ Design length: 3.9km ■ Designed belt width: 800mm ■ Design belt speed: 0-3.2m/s ■ Belt type: steel wire belt ST800 ■ Configuration power: head (2 × 160kW) ■ Tensioning mode: frequency conversion automatic tensioning Vertical lifting belt conveyor design parameters for subway tunnel ■ Conveying medium: slag soil ■ Design capacity: 740t/h ■ Lifting height: 75m ■ Lifting angle: 82° ■ Designed belt width: 1400t/h ■ Designed belt width: 1400mm ■ Design belt speed: 0-2.5m/s ■ Tape type: corrugated edge steel wire belt ST1600 ■ Configuration power: head (250kW)

Φ6980 earth pressure balance shield supporting continuous belt conveyor design parameters ■ Conveying medium: slag soil ■ Design capacity: 370t/h ■ Design length: 3.9km ■ Designed belt width: 800mm ■ Design belt speed: 0-3.2m/s ■ Belt type: steel wire belt ST800 ■ Configuration power: head (2 × 160kW) ■ Tensioning mode: frequency conversion automatic tensioning Vertical lifting belt conveyor design parameters for subway tunnel ■ Conveying medium: slag soil ■ Design capacity: 740t/h ■ Lifting height: 75m ■ Lifting angle: 82° ■ Designed belt width: 1400t/h ■ Designed belt width: 1400mm ■ Design belt speed: 0-2.5m/s ■ Tape type: corrugated edge steel wire belt ST1600 ■ Configuration power: head (250kW)

■ Shield name: composite soil pressure balance shield machine ■ Excavation diameter (mm): 6280 ■ Applicable pipe sheet specifications: outer diameter 6m, inner diameter 5.4m, maximum ring width 1.5m ■ Applicable strata: all kinds of rock, soft soil, pebbles, composite strata within 120MPa ■ Maximum torque (KN-m): 6000 ■ Breakaway torque (KN-m): 7200 ■ Maximum thrust (KN): 3500 ■ Design working pressure (Bar): 5 ■ Cutter form: composite/soft soil

■ Shield name: composite soil pressure balance shield machine ■ Excavation diameter (mm): 4350 ■ Applicable pipe sheet specifications: outer diameter 4.1m, inner diameter 3.6m, maximum ring width 1.2m ■ Applicable strata: all kinds of rock, soft soil, pebbles, composite strata within 120MPa ■ Maximum torque (KN-m): 2350 ■ Breakaway torque (KN-m): 2820 ■ Maximum thrust (KN): 1862 ■ Design working pressure (Bar): 5 ■ Cutter form: composite/soft soil

■ Shield name: composite soil pressure balance shield machine ■ Excavation diameter (mm): 6980 ■ Applicable pipe sheet specifications: outer diameter 6.7m, inner diameter 6m, maximum ring width 1.5m ■ Applicable strata: all kinds of rock, soft soil, pebbles, composite strata within 120MPa ■ Maximum torque (KN-m): 9321 ■ Breakaway torque (KN-m): 11185 ■ Maximum thrust (KN): 5060 ■ Design working pressure (Bar): 5 ■ Cutter form: composite/soft soil

■ Shield name: EPB/TBM dual-mode shield machine ■ Excavation diameter (mm): 6980 ■ Applicable pipe sheet specifications: outer diameter 6.7m, inner diameter 6m, maximum ring width 1.5m ■ Applicable strata: all kinds of rock, soft soil, pebbles, composite strata ■ Maximum torque (KN-m): 5920 ■ Breakaway torque (KN-m): 7100 ■ Maximum thrust (KN): 5060 ■ Design working pressure (Bar): 5 ■ Cutter form: composite/soft soil

Earth Pressure Balance Machine Earth pressure balance machine is a closed shield, using the slag soil excavated by the cutter head into the soil bin as the main medium to balance the water and soil pressure on the excavation surface, in order to achieve the effect of stabilizing the excavation surface. It is suitable for most domestic urban subway tunnels and tube tunnel construction projects. Product features: Wide stratigraphic adaptability, adapted to silt, clay, sand, pebble gravel, full/medium/slightly weathered rock layers, soft and hard uneven composite strata; High excavation efficiency and low construction cost. High reliability of the main drive bearing, sealing system and reducer, also with long life and high safety.