Tekken Construction Co., Ltd.

Junpei Kawade

Toshiaki Takano

Yoshihiro Kumaki

Mitsuo Inoue

An improved attitude control system for tunnel boring machine shields is provided. A laser beam transmitter is installed in an already bored tunnel behind the machine shield for transmitting a laser beam in parallel to a predetermined tunneling direction and a device for receiving the beam is installed in the shield for detecting any deviation of the shield from the beam so that, when the deviation is detected during tunneling work performed by rotating a foreward end cutter head of the shield and propelling the shield toward tunnel face ground with a plurality of jacks installed at rearward end of the shield, the jacks are selectively driven in response to resultant deviational direction and amount of the detection so as to remove the deviation.

Attitude control means of tunnel boring machine shield

Attitude controlling method of tunneling machine shield and system for performing the method, wherein a plurality of jacks installed at a tail end of the shield for propelling the same toward tunnel face ground are selectively driven when the shield deviates from intended tunneling direction. Such deviation detected is first indicated in an indicating and controlling unit and then the unit is operated to actuate an associated circuit connected to the respective jacks in accordance with the indicated deviation so that selective ones only of the jacks effective to correct the deviation will be driven.

Growing community of inventors

Ichikawa, Japan

Junpei Kawade