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| APPLICATION OF GEODETIC QUADRANGLE METHOD IN THE CONTROL SURVEY OF TUNNEL PORTAL PLUMBING |
| DUAN Jie |
| Shanghai Jiajin Highway Development Co. Ltd |
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Abstract Research purpose: Construction survey is the fundamental work for tunnel construction. We must pay sufficient attention to how to control survey well during construction. We must select correct and exact methods on the base of actual situation of project for setting positions of control points, survey outside and file inside.
Research method: The paper introduced the requirements for setting plumb points on tunnel portal, characteristics of geodetic quadrangle survey method, its application and calculation methods for inside work, and gave some concrete project examples.
Research result: The paper also expatiated the theories and methods applied to geodetic quadrangle survey method for tunnel control survey and raised out the geodetic quadrangle control net, is a quite convenient method with high precision for control survey on tunnel portals. Calculating method and application to concrete examples can be a kind of reference to selection of plumb points position, set of tunnel survey control net and treatment of data from inside work for similar tunnel construction.
Research conclusion: There are many forms for set of tunnel survey control net. We must choose the proper form according to the requirement of control survey and construction characteristics, to ensure the precision of control survey and be convenient to the construction.
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Received: 08 October 2005
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2006, Vol. 23 
