特长跨海大桥安全监测方法的研究

在特长跨海大桥施工定位与安全监测工作中经常遇到难以克服的困难,为此人们不得不借助于RTKGPS技术.当然,跨海大桥的安全监测问题单纯利用RTK GPS技术是远远不够的,因为跨海大桥安全监测的精度要求远远高于施工定位,不采取一定的技术措施很难实现对跨海大桥运营安全的有效监测.为了较好地解决特长跨海大桥的安全监测问题,笔者与科研小组结合实践提出了通过合理布设三维控制基准系统实施跨海大桥运营安全有效监测的想法,三维控制基准系统的构建应综合考虑投影问题、网形结构问题、施测方法问题,结合我国目前在建的几座跨海大桥论述了跨海大桥安全监测三维控制基准系统构建的基本设计思路.

Research on the Method of Safety Monitoring of Super-long Sea-crossing Bridges

The position fixing in construction and safety monitoring of super-long sea-crossing bridges is very difficult. RTK GPS technique has to be used. Nevertheless, RTK GPS technique is not efficacious enough in position fixing for super-long sea-crossing bridge construction. The safety monitoring precision for the superlong sea-crossing bridges is much higher than that of general construction positioning. Some techniques should be used to resolve the difficulty of structures safety monitoring. It puts forward some new ideas on reasonably setting up three-dimensional surveying control network. The problems concerning projection mode, structure of surveying control network and surveying method have all been taken into complete consideration. This paper presents the basic design and constructing of the three-dimensional surveying control system for the sea-crossing bridges building in China now.