污水提标技术在炼化污水处理中的应用

大型桥梁工程由于两岸通视困难，用传统测量方法直接布设大桥工程控制网及进行大桥施工测量非常困难，因此GPS定位技术在大型桥梁工程的施工控制网测量中应用广泛。本文详细介绍了荆岳铁路洞庭湖大桥施工控制网的测量方案及实施情况，在测量中采用了GPS定位技术来建立施工控制网，整个施工控制网的测量包括施工平面控制网测量和施工高程控制网测量。结果表明获得的平面和高程控制测量成果精度均优于二等精度，可满足工程定测和施工测量应用的需要。

Construction Control Network Survey for the Dongting Lake Bridge of Jing Yue Railway

It is very difficult to build bridge project control network and carry on the bridge construction survey using tradition measuring techniques directly for large bridges because of both banks intervisibility is extremely difficult. There-fore, the GPS technology is widely used in the survey of construction control network for large bridges. This paper intro-duces the design and the implementation of the construction control network for the Dongting Lake Bridge of Jing Yue Railway. In survey, the GPS technology is used to build the construction control network. The survey of construction control network consists of the survey of plane control network and the survey of elevation control network. Results indi-cate that both the accuracy of horizontal and the vertical results of the control network are better than the standards of the 2nd order national network, which can satisfy the demands for location survey and construction survey applications.