Mining or in situ disintegration of hard material – Hard material disintegrating machines – Stepper-type advance-causing means
Patent
1996-04-10
1998-06-16
Bagnell, David J.
Mining or in situ disintegration of hard material
Hard material disintegrating machines
Stepper-type advance-causing means
405141, E21D 906
Patent
active
057659257
ABSTRACT:
A tunnel boring machine for boring a tunnel through hard and soft grounds includes a front body, a cutter head mounted to the front body and having a cutter for boring a hard round, and a drive unit rotatably supporting the cutter head for driving the cutter head. A main beam is operatively connected to the cutter head drive unit and extends rearward therefrom. A gripper body is supported by a rear end portion of the main beam to be slidable in an axial direction thereof and is provided with a main gripper to be movable along an radial direction of the main beam. A first thrust jack is mounted to be fitted between the main gripper and the main beam for advancing the cutter head and the cutter head drive unit. A shield shell is disposed so as to surround the cutter head drive unit. A second thrust jack is disposed in the shield shell, and a front gripper is mounted to the shield shell to be movable out of and into the shield shell.
REFERENCES:
patent: 4043137 (1977-08-01), Jutte et al.
patent: 4494799 (1985-01-01), Snyder
patent: 4637657 (1987-01-01), Snyder
patent: 4804295 (1989-02-01), Kondo
Fukuda Yuko
Kondo Yasunori
Yoshida Takato
Bagnell David J.
Kawasaki Jukogyo Kabushiki Kaisha
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