Practice of Laser Plummet Apparatus Upward Point in Subway Tunnel Project
Gao Shao-wei · Beijing Surveying and Mapping · 2008
In the shield method of subway tunnel project measuring,improving the linkage measure technique has a decisive function on the tunnel breakthrough.By distributing the error resources in the subway project breakthrough measuring,this paper carries out the accuracy analyses of the two wells direction laser plummet apparatus upward point method,compares the calculating results of steel wire point method and finally proposes a project method of improving the laser plummet apparatus upward point method.