Patent ID: 11905835
Assignee: nan
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
1. A tunnel digging machine (TDM) for use in excavation of tunnels, the machine comprising:
a mobile frame that moves back and forth inside a shield of said TDM by a plurality of thrust cylinders,
a plurality of cutter rotors, cutter drums and mucking conveyors that are mounted on said mobile frame,
wherein in a digging mode of said TDM, said cutter rotors, cutter drums and mucking conveyors are moved forward by expanding said thrust cylinders to reach a face of the tunnel,
wherein in a sealing mode of said TDM, said cutter rotors, cutter drums and mucking conveyors are moved backward by retracting said thrust cylinders to a position inside said shield,
wherein a plurality of access doors and openings are placed on said mobile frame to make access to a front of said mobile frame for inspection and maintenance purposes in the sealing mode.