The Research of Key Technology and Superiority in Magnetic Suspension Gyro Station and Application in Underground Engineering

The gyro theodolite with suspension-belt（GAK1, JT15） is traditionally and commonly used in mine surveying for the orientation. However, with the rapidly development of underground engineering, the traditional instruments can't meet the constructive needs of the long and large tunnels. Allow for its insufficiency in practical application, this paper discussed the key technology, technical characteristics and system advantages of the GAT magnetic suspension gyro station which is self-developed. Finally, combining the application in Chengdu Metro, the paper proves the bright prospects for magnetic suspension gyro station using in underground engineering as well as the promotion of system superiority with the high accuracy, high stability and operation convenience.