Abstract:

The shieldbored tunnel from Jinshiqiao Station to Tianjin Railway Station Station on No. 3 Line of Tianjin Metro crosses underneath BeijingTianjin highspeed railway. During the construction of the shieldbored tunnel, automatic monitoring is made for the highspeed railwy. The main content of the article is as follows: 1) The details of the shield boring crossing underneath the existing highspeed railway lines, as well as the features and requirements of the monitoring of the highspeed railway, are presented. It is concluded that automatic monitoring must be made for the highspeed railway. 2) Many items of the highspeed railway should be monitored. In the paper, the automatic monitoring of the subgrade and steel rail of the highspeed railway is studied. 3) The layout of the monitoring points of the hydrostatic leveling monitoring and that of the total station monitoring, as well as the issues to which special attention should be paid, are presented in detail. It is concluded that the effect of each monitoring method cannot be maximized until the particularity of the specific environment is considered. 4) The analysis on the monitoring data shows that the automatic monitoring system consisting of intelligent electronic total station monitoring and prism monitoring is reliable in the monitoring of the highspeed railway. The paper can provide a new concept for the automatic monitoring of the steel rails of highspeed railways in the future.

Key words: highspeed railway, hydrostatic leveling, intelligent electronic total station, automatic monitoring, steel rail, shield machine